#include "attr-fnspec.h"
#include "demangle.h"
#include "gimple-range.h"
+#include "pointer-query.h"
+#include "gimple-ssa-warn-access.h"
struct target_builtins default_target_builtins;
#if SWITCHABLE_TARGET
static void maybe_emit_sprintf_chk_warning (tree, enum built_in_function);
static tree fold_builtin_object_size (tree, tree);
static bool check_read_access (tree, tree, tree = NULL_TREE, int = 1);
-static bool compute_objsize_r (tree, int, access_ref *, ssa_name_limit_t &,
- pointer_query *);
unsigned HOST_WIDE_INT target_newline;
unsigned HOST_WIDE_INT target_percent;
static tree do_mpfr_lgamma_r (tree, tree, tree);
static void expand_builtin_sync_synchronize (void);
-access_ref::access_ref (tree bound /* = NULL_TREE */,
- bool minaccess /* = false */)
-: ref (), eval ([](tree x){ return x; }), deref (), trail1special (true),
- base0 (true), parmarray ()
-{
- /* Set to valid. */
- offrng[0] = offrng[1] = 0;
- offmax[0] = offmax[1] = 0;
- /* Invalidate. */
- sizrng[0] = sizrng[1] = -1;
-
- /* Set the default bounds of the access and adjust below. */
- bndrng[0] = minaccess ? 1 : 0;
- bndrng[1] = HOST_WIDE_INT_M1U;
-
- /* When BOUND is nonnull and a range can be extracted from it,
- set the bounds of the access to reflect both it and MINACCESS.
- BNDRNG[0] is the size of the minimum access. */
- tree rng[2];
- if (bound && get_size_range (bound, rng, SR_ALLOW_ZERO))
- {
- bndrng[0] = wi::to_offset (rng[0]);
- bndrng[1] = wi::to_offset (rng[1]);
- bndrng[0] = bndrng[0] > 0 && minaccess ? 1 : 0;
- }
-}
-
-/* Return the PHI node REF refers to or null if it doesn't. */
-
-gphi *
-access_ref::phi () const
-{
- if (!ref || TREE_CODE (ref) != SSA_NAME)
- return NULL;
-
- gimple *def_stmt = SSA_NAME_DEF_STMT (ref);
- if (gimple_code (def_stmt) != GIMPLE_PHI)
- return NULL;
-
- return as_a <gphi *> (def_stmt);
-}
-
-/* Determine and return the largest object to which *THIS. If *THIS
- refers to a PHI and PREF is nonnull, fill *PREF with the details
- of the object determined by compute_objsize(ARG, OSTYPE) for each
- PHI argument ARG. */
-
-tree
-access_ref::get_ref (vec<access_ref> *all_refs,
- access_ref *pref /* = NULL */,
- int ostype /* = 1 */,
- ssa_name_limit_t *psnlim /* = NULL */,
- pointer_query *qry /* = NULL */) const
-{
- gphi *phi_stmt = this->phi ();
- if (!phi_stmt)
- return ref;
-
- /* FIXME: Calling get_ref() with a null PSNLIM is dangerous and might
- cause unbounded recursion. */
- ssa_name_limit_t snlim_buf;
- if (!psnlim)
- psnlim = &snlim_buf;
-
- if (!psnlim->visit_phi (ref))
- return NULL_TREE;
-
- /* Reflects the range of offsets of all PHI arguments refer to the same
- object (i.e., have the same REF). */
- access_ref same_ref;
- /* The conservative result of the PHI reflecting the offset and size
- of the largest PHI argument, regardless of whether or not they all
- refer to the same object. */
- pointer_query empty_qry;
- if (!qry)
- qry = &empty_qry;
-
- access_ref phi_ref;
- if (pref)
- {
- phi_ref = *pref;
- same_ref = *pref;
- }
-
- /* Set if any argument is a function array (or VLA) parameter not
- declared [static]. */
- bool parmarray = false;
- /* The size of the smallest object referenced by the PHI arguments. */
- offset_int minsize = 0;
- const offset_int maxobjsize = wi::to_offset (max_object_size ());
- /* The offset of the PHI, not reflecting those of its arguments. */
- const offset_int orng[2] = { phi_ref.offrng[0], phi_ref.offrng[1] };
-
- const unsigned nargs = gimple_phi_num_args (phi_stmt);
- for (unsigned i = 0; i < nargs; ++i)
- {
- access_ref phi_arg_ref;
- tree arg = gimple_phi_arg_def (phi_stmt, i);
- if (!compute_objsize_r (arg, ostype, &phi_arg_ref, *psnlim, qry)
- || phi_arg_ref.sizrng[0] < 0)
- /* A PHI with all null pointer arguments. */
- return NULL_TREE;
-
- /* Add PREF's offset to that of the argument. */
- phi_arg_ref.add_offset (orng[0], orng[1]);
- if (TREE_CODE (arg) == SSA_NAME)
- qry->put_ref (arg, phi_arg_ref);
-
- if (all_refs)
- all_refs->safe_push (phi_arg_ref);
-
- const bool arg_known_size = (phi_arg_ref.sizrng[0] != 0
- || phi_arg_ref.sizrng[1] != maxobjsize);
-
- parmarray |= phi_arg_ref.parmarray;
-
- const bool nullp = integer_zerop (arg) && (i || i + 1 < nargs);
-
- if (phi_ref.sizrng[0] < 0)
- {
- if (!nullp)
- same_ref = phi_arg_ref;
- phi_ref = phi_arg_ref;
- if (arg_known_size)
- minsize = phi_arg_ref.sizrng[0];
- continue;
- }
-
- const bool phi_known_size = (phi_ref.sizrng[0] != 0
- || phi_ref.sizrng[1] != maxobjsize);
-
- if (phi_known_size && phi_arg_ref.sizrng[0] < minsize)
- minsize = phi_arg_ref.sizrng[0];
-
- /* Disregard null pointers in PHIs with two or more arguments.
- TODO: Handle this better! */
- if (nullp)
- continue;
-
- /* Determine the amount of remaining space in the argument. */
- offset_int argrem[2];
- argrem[1] = phi_arg_ref.size_remaining (argrem);
-
- /* Determine the amount of remaining space computed so far and
- if the remaining space in the argument is more use it instead. */
- offset_int phirem[2];
- phirem[1] = phi_ref.size_remaining (phirem);
-
- if (phi_arg_ref.ref != same_ref.ref)
- same_ref.ref = NULL_TREE;
-
- if (phirem[1] < argrem[1]
- || (phirem[1] == argrem[1]
- && phi_ref.sizrng[1] < phi_arg_ref.sizrng[1]))
- /* Use the argument with the most space remaining as the result,
- or the larger one if the space is equal. */
- phi_ref = phi_arg_ref;
-
- /* Set SAME_REF.OFFRNG to the maximum range of all arguments. */
- if (phi_arg_ref.offrng[0] < same_ref.offrng[0])
- same_ref.offrng[0] = phi_arg_ref.offrng[0];
- if (same_ref.offrng[1] < phi_arg_ref.offrng[1])
- same_ref.offrng[1] = phi_arg_ref.offrng[1];
- }
-
- if (!same_ref.ref && same_ref.offrng[0] != 0)
- /* Clear BASE0 if not all the arguments refer to the same object and
- if not all their offsets are zero-based. This allows the final
- PHI offset to out of bounds for some arguments but not for others
- (or negative even of all the arguments are BASE0), which is overly
- permissive. */
- phi_ref.base0 = false;
-
- if (same_ref.ref)
- phi_ref = same_ref;
- else
- {
- /* Replace the lower bound of the largest argument with the size
- of the smallest argument, and set PARMARRAY if any argument
- was one. */
- phi_ref.sizrng[0] = minsize;
- phi_ref.parmarray = parmarray;
- }
-
- if (phi_ref.sizrng[0] < 0)
- {
- /* Fail if none of the PHI's arguments resulted in updating PHI_REF
- (perhaps because they have all been already visited by prior
- recursive calls). */
- psnlim->leave_phi (ref);
- return NULL_TREE;
- }
-
- /* Avoid changing *THIS. */
- if (pref && pref != this)
- *pref = phi_ref;
-
- psnlim->leave_phi (ref);
-
- return phi_ref.ref;
-}
-
-/* Return the maximum amount of space remaining and if non-null, set
- argument to the minimum. */
-
-offset_int
-access_ref::size_remaining (offset_int *pmin /* = NULL */) const
-{
- offset_int minbuf;
- if (!pmin)
- pmin = &minbuf;
-
- /* add_offset() ensures the offset range isn't inverted. */
- gcc_checking_assert (offrng[0] <= offrng[1]);
-
- if (base0)
- {
- /* The offset into referenced object is zero-based (i.e., it's
- not referenced by a pointer into middle of some unknown object). */
- if (offrng[0] < 0 && offrng[1] < 0)
- {
- /* If the offset is negative the remaining size is zero. */
- *pmin = 0;
- return 0;
- }
-
- if (sizrng[1] <= offrng[0])
- {
- /* If the starting offset is greater than or equal to the upper
- bound on the size of the object, the space remaining is zero.
- As a special case, if it's equal, set *PMIN to -1 to let
- the caller know the offset is valid and just past the end. */
- *pmin = sizrng[1] == offrng[0] ? -1 : 0;
- return 0;
- }
-
- /* Otherwise return the size minus the lower bound of the offset. */
- offset_int or0 = offrng[0] < 0 ? 0 : offrng[0];
-
- *pmin = sizrng[0] - or0;
- return sizrng[1] - or0;
- }
-
- /* The offset to the referenced object isn't zero-based (i.e., it may
- refer to a byte other than the first. The size of such an object
- is constrained only by the size of the address space (the result
- of max_object_size()). */
- if (sizrng[1] <= offrng[0])
- {
- *pmin = 0;
- return 0;
- }
-
- offset_int or0 = offrng[0] < 0 ? 0 : offrng[0];
-
- *pmin = sizrng[0] - or0;
- return sizrng[1] - or0;
-}
-
-/* Return true if the offset and object size are in range for SIZE. */
-
-bool
-access_ref::offset_in_range (const offset_int &size) const
-{
- if (size_remaining () < size)
- return false;
-
- if (base0)
- return offmax[0] >= 0 && offmax[1] <= sizrng[1];
-
- offset_int maxoff = wi::to_offset (TYPE_MAX_VALUE (ptrdiff_type_node));
- return offmax[0] > -maxoff && offmax[1] < maxoff;
-}
-
-/* Add the range [MIN, MAX] to the offset range. For known objects (with
- zero-based offsets) at least one of whose offset's bounds is in range,
- constrain the other (or both) to the bounds of the object (i.e., zero
- and the upper bound of its size). This improves the quality of
- diagnostics. */
-
-void access_ref::add_offset (const offset_int &min, const offset_int &max)
-{
- if (min <= max)
- {
- /* To add an ordinary range just add it to the bounds. */
- offrng[0] += min;
- offrng[1] += max;
- }
- else if (!base0)
- {
- /* To add an inverted range to an offset to an unknown object
- expand it to the maximum. */
- add_max_offset ();
- return;
- }
- else
- {
- /* To add an inverted range to an offset to an known object set
- the upper bound to the maximum representable offset value
- (which may be greater than MAX_OBJECT_SIZE).
- The lower bound is either the sum of the current offset and
- MIN when abs(MAX) is greater than the former, or zero otherwise.
- Zero because then then inverted range includes the negative of
- the lower bound. */
- offset_int maxoff = wi::to_offset (TYPE_MAX_VALUE (ptrdiff_type_node));
- offrng[1] = maxoff;
-
- if (max >= 0)
- {
- offrng[0] = 0;
- if (offmax[0] > 0)
- offmax[0] = 0;
- return;
- }
-
- offset_int absmax = wi::abs (max);
- if (offrng[0] < absmax)
- {
- offrng[0] += min;
- /* Cap the lower bound at the upper (set to MAXOFF above)
- to avoid inadvertently recreating an inverted range. */
- if (offrng[1] < offrng[0])
- offrng[0] = offrng[1];
- }
- else
- offrng[0] = 0;
- }
-
- /* Set the minimum and maximmum computed so far. */
- if (offrng[1] < 0 && offrng[1] < offmax[0])
- offmax[0] = offrng[1];
- if (offrng[0] > 0 && offrng[0] > offmax[1])
- offmax[1] = offrng[0];
-
- if (!base0)
- return;
-
- /* When referencing a known object check to see if the offset computed
- so far is in bounds... */
- offset_int remrng[2];
- remrng[1] = size_remaining (remrng);
- if (remrng[1] > 0 || remrng[0] < 0)
- {
- /* ...if so, constrain it so that neither bound exceeds the size of
- the object. Out of bounds offsets are left unchanged, and, for
- better or worse, become in bounds later. They should be detected
- and diagnosed at the point they first become invalid by
- -Warray-bounds. */
- if (offrng[0] < 0)
- offrng[0] = 0;
- if (offrng[1] > sizrng[1])
- offrng[1] = sizrng[1];
- }
-}
-
-/* Set a bit for the PHI in VISITED and return true if it wasn't
- already set. */
-
-bool
-ssa_name_limit_t::visit_phi (tree ssa_name)
-{
- if (!visited)
- visited = BITMAP_ALLOC (NULL);
-
- /* Return false if SSA_NAME has already been visited. */
- return bitmap_set_bit (visited, SSA_NAME_VERSION (ssa_name));
-}
-
-/* Clear a bit for the PHI in VISITED. */
-
-void
-ssa_name_limit_t::leave_phi (tree ssa_name)
-{
- /* Return false if SSA_NAME has already been visited. */
- bitmap_clear_bit (visited, SSA_NAME_VERSION (ssa_name));
-}
-
-/* Return false if the SSA_NAME chain length counter has reached
- the limit, otherwise increment the counter and return true. */
-
-bool
-ssa_name_limit_t::next ()
-{
- /* Return a negative value to let caller avoid recursing beyond
- the specified limit. */
- if (ssa_def_max == 0)
- return false;
-
- --ssa_def_max;
- return true;
-}
-
-/* If the SSA_NAME has already been "seen" return a positive value.
- Otherwise add it to VISITED. If the SSA_NAME limit has been
- reached, return a negative value. Otherwise return zero. */
-
-int
-ssa_name_limit_t::next_phi (tree ssa_name)
-{
- {
- gimple *def_stmt = SSA_NAME_DEF_STMT (ssa_name);
- /* Return a positive value if the PHI has already been visited. */
- if (gimple_code (def_stmt) == GIMPLE_PHI
- && !visit_phi (ssa_name))
- return 1;
- }
-
- /* Return a negative value to let caller avoid recursing beyond
- the specified limit. */
- if (ssa_def_max == 0)
- return -1;
-
- --ssa_def_max;
-
- return 0;
-}
-
-ssa_name_limit_t::~ssa_name_limit_t ()
-{
- if (visited)
- BITMAP_FREE (visited);
-}
-
-/* Default ctor. Initialize object with pointers to the range_query
- and cache_type instances to use or null. */
-
-pointer_query::pointer_query (range_query *qry /* = NULL */,
- cache_type *cache /* = NULL */)
-: rvals (qry), var_cache (cache), hits (), misses (),
- failures (), depth (), max_depth ()
-{
- /* No op. */
-}
-
-/* Return a pointer to the cached access_ref instance for the SSA_NAME
- PTR if it's there or null otherwise. */
-
-const access_ref *
-pointer_query::get_ref (tree ptr, int ostype /* = 1 */) const
-{
- if (!var_cache)
- {
- ++misses;
- return NULL;
- }
-
- unsigned version = SSA_NAME_VERSION (ptr);
- unsigned idx = version << 1 | (ostype & 1);
- if (var_cache->indices.length () <= idx)
- {
- ++misses;
- return NULL;
- }
-
- unsigned cache_idx = var_cache->indices[idx];
- if (var_cache->access_refs.length () <= cache_idx)
- {
- ++misses;
- return NULL;
- }
-
- access_ref &cache_ref = var_cache->access_refs[cache_idx];
- if (cache_ref.ref)
- {
- ++hits;
- return &cache_ref;
- }
-
- ++misses;
- return NULL;
-}
-
-/* Retrieve the access_ref instance for a variable from the cache if it's
- there or compute it and insert it into the cache if it's nonnonull. */
-
-bool
-pointer_query::get_ref (tree ptr, access_ref *pref, int ostype /* = 1 */)
-{
- const unsigned version
- = TREE_CODE (ptr) == SSA_NAME ? SSA_NAME_VERSION (ptr) : 0;
-
- if (var_cache && version)
- {
- unsigned idx = version << 1 | (ostype & 1);
- if (idx < var_cache->indices.length ())
- {
- unsigned cache_idx = var_cache->indices[idx] - 1;
- if (cache_idx < var_cache->access_refs.length ()
- && var_cache->access_refs[cache_idx].ref)
- {
- ++hits;
- *pref = var_cache->access_refs[cache_idx];
- return true;
- }
- }
-
- ++misses;
- }
-
- if (!compute_objsize (ptr, ostype, pref, this))
- {
- ++failures;
- return false;
- }
-
- return true;
-}
-
-/* Add a copy of the access_ref REF for the SSA_NAME to the cache if it's
- nonnull. */
-
-void
-pointer_query::put_ref (tree ptr, const access_ref &ref, int ostype /* = 1 */)
-{
- /* Only add populated/valid entries. */
- if (!var_cache || !ref.ref || ref.sizrng[0] < 0)
- return;
-
- /* Add REF to the two-level cache. */
- unsigned version = SSA_NAME_VERSION (ptr);
- unsigned idx = version << 1 | (ostype & 1);
-
- /* Grow INDICES if necessary. An index is valid if it's nonzero.
- Its value minus one is the index into ACCESS_REFS. Not all
- entries are valid. */
- if (var_cache->indices.length () <= idx)
- var_cache->indices.safe_grow_cleared (idx + 1);
-
- if (!var_cache->indices[idx])
- var_cache->indices[idx] = var_cache->access_refs.length () + 1;
-
- /* Grow ACCESS_REF cache if necessary. An entry is valid if its
- REF member is nonnull. All entries except for the last two
- are valid. Once nonnull, the REF value must stay unchanged. */
- unsigned cache_idx = var_cache->indices[idx];
- if (var_cache->access_refs.length () <= cache_idx)
- var_cache->access_refs.safe_grow_cleared (cache_idx + 1);
-
- access_ref cache_ref = var_cache->access_refs[cache_idx - 1];
- if (cache_ref.ref)
- {
- gcc_checking_assert (cache_ref.ref == ref.ref);
- return;
- }
-
- cache_ref = ref;
-}
-
-/* Flush the cache if it's nonnull. */
-
-void
-pointer_query::flush_cache ()
-{
- if (!var_cache)
- return;
- var_cache->indices.release ();
- var_cache->access_refs.release ();
-}
-
/* Return true if NAME starts with __builtin_ or __sync_. */
static bool
return n;
}
-/* For a call EXPR at LOC to a function FNAME that expects a string
- in the argument ARG, issue a diagnostic due to it being a called
- with an argument that is a character array with no terminating
- NUL. SIZE is the EXACT size of the array, and BNDRNG the number
- of characters in which the NUL is expected. Either EXPR or FNAME
- may be null but noth both. SIZE may be null when BNDRNG is null. */
-
-void
-warn_string_no_nul (location_t loc, tree expr, const char *fname,
- tree arg, tree decl, tree size /* = NULL_TREE */,
- bool exact /* = false */,
- const wide_int bndrng[2] /* = NULL */)
-{
- const opt_code opt = OPT_Wstringop_overread;
- if ((expr && warning_suppressed_p (expr, opt))
- || warning_suppressed_p (arg, opt))
- return;
-
- loc = expansion_point_location_if_in_system_header (loc);
- bool warned;
-
- /* Format the bound range as a string to keep the nuber of messages
- from exploding. */
- char bndstr[80];
- *bndstr = 0;
- if (bndrng)
- {
- if (bndrng[0] == bndrng[1])
- sprintf (bndstr, "%llu", (unsigned long long) bndrng[0].to_uhwi ());
- else
- sprintf (bndstr, "[%llu, %llu]",
- (unsigned long long) bndrng[0].to_uhwi (),
- (unsigned long long) bndrng[1].to_uhwi ());
- }
-
- const tree maxobjsize = max_object_size ();
- const wide_int maxsiz = wi::to_wide (maxobjsize);
- if (expr)
- {
- tree func = get_callee_fndecl (expr);
- if (bndrng)
- {
- if (wi::ltu_p (maxsiz, bndrng[0]))
- warned = warning_at (loc, opt,
- "%qD specified bound %s exceeds "
- "maximum object size %E",
- func, bndstr, maxobjsize);
- else
- {
- bool maybe = wi::to_wide (size) == bndrng[0];
- warned = warning_at (loc, opt,
- exact
- ? G_("%qD specified bound %s exceeds "
- "the size %E of unterminated array")
- : (maybe
- ? G_("%qD specified bound %s may "
- "exceed the size of at most %E "
- "of unterminated array")
- : G_("%qD specified bound %s exceeds "
- "the size of at most %E "
- "of unterminated array")),
- func, bndstr, size);
- }
- }
- else
- warned = warning_at (loc, opt,
- "%qD argument missing terminating nul",
- func);
- }
- else
- {
- if (bndrng)
- {
- if (wi::ltu_p (maxsiz, bndrng[0]))
- warned = warning_at (loc, opt,
- "%qs specified bound %s exceeds "
- "maximum object size %E",
- fname, bndstr, maxobjsize);
- else
- {
- bool maybe = wi::to_wide (size) == bndrng[0];
- warned = warning_at (loc, opt,
- exact
- ? G_("%qs specified bound %s exceeds "
- "the size %E of unterminated array")
- : (maybe
- ? G_("%qs specified bound %s may "
- "exceed the size of at most %E "
- "of unterminated array")
- : G_("%qs specified bound %s exceeds "
- "the size of at most %E "
- "of unterminated array")),
- fname, bndstr, size);
- }
- }
- else
- warned = warning_at (loc, opt,
- "%qs argument missing terminating nul",
- fname);
- }
-
- if (warned)
- {
- inform (DECL_SOURCE_LOCATION (decl),
- "referenced argument declared here");
- suppress_warning (arg, opt);
- if (expr)
- suppress_warning (expr, opt);
- }
-}
-
-/* For a call EXPR (which may be null) that expects a string argument
- SRC as an argument, returns false if SRC is a character array with
- no terminating NUL. When nonnull, BOUND is the number of characters
- in which to expect the terminating NUL. RDONLY is true for read-only
- accesses such as strcmp, false for read-write such as strcpy. When
- EXPR is also issues a warning. */
-
-bool
-check_nul_terminated_array (tree expr, tree src,
- tree bound /* = NULL_TREE */)
-{
- /* The constant size of the array SRC points to. The actual size
- may be less of EXACT is true, but not more. */
- tree size;
- /* True if SRC involves a non-constant offset into the array. */
- bool exact;
- /* The unterminated constant array SRC points to. */
- tree nonstr = unterminated_array (src, &size, &exact);
- if (!nonstr)
- return true;
-
- /* NONSTR refers to the non-nul terminated constant array and SIZE
- is the constant size of the array in bytes. EXACT is true when
- SIZE is exact. */
-
- wide_int bndrng[2];
- if (bound)
- {
- value_range r;
-
- get_global_range_query ()->range_of_expr (r, bound);
-
- if (r.kind () != VR_RANGE)
- return true;
-
- bndrng[0] = r.lower_bound ();
- bndrng[1] = r.upper_bound ();
-
- if (exact)
- {
- if (wi::leu_p (bndrng[0], wi::to_wide (size)))
- return true;
- }
- else if (wi::lt_p (bndrng[0], wi::to_wide (size), UNSIGNED))
- return true;
- }
-
- if (expr)
- warn_string_no_nul (EXPR_LOCATION (expr), expr, NULL, src, nonstr,
- size, exact, bound ? bndrng : NULL);
-
- return false;
-}
-
-/* If EXP refers to an unterminated constant character array return
- the declaration of the object of which the array is a member or
- element and if SIZE is not null, set *SIZE to the size of
- the unterminated array and set *EXACT if the size is exact or
- clear it otherwise. Otherwise return null. */
-
-tree
-unterminated_array (tree exp, tree *size /* = NULL */, bool *exact /* = NULL */)
-{
- /* C_STRLEN will return NULL and set DECL in the info
- structure if EXP references a unterminated array. */
- c_strlen_data lendata = { };
- tree len = c_strlen (exp, 1, &lendata);
- if (len == NULL_TREE && lendata.minlen && lendata.decl)
- {
- if (size)
- {
- len = lendata.minlen;
- if (lendata.off)
- {
- /* Constant offsets are already accounted for in LENDATA.MINLEN,
- but not in a SSA_NAME + CST expression. */
- if (TREE_CODE (lendata.off) == INTEGER_CST)
- *exact = true;
- else if (TREE_CODE (lendata.off) == PLUS_EXPR
- && TREE_CODE (TREE_OPERAND (lendata.off, 1)) == INTEGER_CST)
- {
- /* Subtract the offset from the size of the array. */
- *exact = false;
- tree temp = TREE_OPERAND (lendata.off, 1);
- temp = fold_convert (ssizetype, temp);
- len = fold_build2 (MINUS_EXPR, ssizetype, len, temp);
- }
- else
- *exact = false;
- }
- else
- *exact = true;
-
- *size = len;
- }
- return lendata.decl;
- }
-
- return NULL_TREE;
-}
-
/* Compute the length of a null-terminated character string or wide
character string handling character sizes of 1, 2, and 4 bytes.
TREE_STRING_LENGTH is not the right way because it evaluates to
GET_MODE_MASK (GET_MODE (len_rtx)));
}
-/* Issue a warning OPT for a bounded call EXP with a bound in RANGE
- accessing an object with SIZE. */
-
+/* A convenience wrapper for check_access above to check access
+ by a read-only function like puts. */
+
static bool
-maybe_warn_for_bound (opt_code opt, location_t loc, tree exp, tree func,
- tree bndrng[2], tree size, const access_data *pad = NULL)
+check_read_access (tree exp, tree src, tree bound /* = NULL_TREE */,
+ int ost /* = 1 */)
{
- if (!bndrng[0] || warning_suppressed_p (exp, opt))
- return false;
-
- tree maxobjsize = max_object_size ();
-
- bool warned = false;
-
- if (opt == OPT_Wstringop_overread)
- {
- bool maybe = pad && pad->src.phi ();
-
- if (tree_int_cst_lt (maxobjsize, bndrng[0]))
- {
- if (bndrng[0] == bndrng[1])
- warned = (func
- ? warning_at (loc, opt,
- (maybe
- ? G_("%qD specified bound %E may "
- "exceed maximum object size %E")
- : G_("%qD specified bound %E "
- "exceeds maximum object size %E")),
- func, bndrng[0], maxobjsize)
- : warning_at (loc, opt,
- (maybe
- ? G_("specified bound %E may "
- "exceed maximum object size %E")
- : G_("specified bound %E "
- "exceeds maximum object size %E")),
- bndrng[0], maxobjsize));
- else
- warned = (func
- ? warning_at (loc, opt,
- (maybe
- ? G_("%qD specified bound [%E, %E] may "
- "exceed maximum object size %E")
- : G_("%qD specified bound [%E, %E] "
- "exceeds maximum object size %E")),
- func, bndrng[0], bndrng[1], maxobjsize)
- : warning_at (loc, opt,
- (maybe
- ? G_("specified bound [%E, %E] may "
- "exceed maximum object size %E")
- : G_("specified bound [%E, %E] "
- "exceeds maximum object size %E")),
- bndrng[0], bndrng[1], maxobjsize));
- }
- else if (!size || tree_int_cst_le (bndrng[0], size))
- return false;
- else if (tree_int_cst_equal (bndrng[0], bndrng[1]))
- warned = (func
- ? warning_at (loc, opt,
- (maybe
- ? G_("%qD specified bound %E may exceed "
- "source size %E")
- : G_("%qD specified bound %E exceeds "
- "source size %E")),
- func, bndrng[0], size)
- : warning_at (loc, opt,
- (maybe
- ? G_("specified bound %E may exceed "
- "source size %E")
- : G_("specified bound %E exceeds "
- "source size %E")),
- bndrng[0], size));
- else
- warned = (func
- ? warning_at (loc, opt,
- (maybe
- ? G_("%qD specified bound [%E, %E] may "
- "exceed source size %E")
- : G_("%qD specified bound [%E, %E] exceeds "
- "source size %E")),
- func, bndrng[0], bndrng[1], size)
- : warning_at (loc, opt,
- (maybe
- ? G_("specified bound [%E, %E] may exceed "
- "source size %E")
- : G_("specified bound [%E, %E] exceeds "
- "source size %E")),
- bndrng[0], bndrng[1], size));
- if (warned)
- {
- if (pad && pad->src.ref)
- {
- if (DECL_P (pad->src.ref))
- inform (DECL_SOURCE_LOCATION (pad->src.ref),
- "source object declared here");
- else if (EXPR_HAS_LOCATION (pad->src.ref))
- inform (EXPR_LOCATION (pad->src.ref),
- "source object allocated here");
- }
- suppress_warning (exp, opt);
- }
-
- return warned;
- }
-
- bool maybe = pad && pad->dst.phi ();
- if (tree_int_cst_lt (maxobjsize, bndrng[0]))
- {
- if (bndrng[0] == bndrng[1])
- warned = (func
- ? warning_at (loc, opt,
- (maybe
- ? G_("%qD specified size %E may "
- "exceed maximum object size %E")
- : G_("%qD specified size %E "
- "exceeds maximum object size %E")),
- func, bndrng[0], maxobjsize)
- : warning_at (loc, opt,
- (maybe
- ? G_("specified size %E may exceed "
- "maximum object size %E")
- : G_("specified size %E exceeds "
- "maximum object size %E")),
- bndrng[0], maxobjsize));
- else
- warned = (func
- ? warning_at (loc, opt,
- (maybe
- ? G_("%qD specified size between %E and %E "
- "may exceed maximum object size %E")
- : G_("%qD specified size between %E and %E "
- "exceeds maximum object size %E")),
- func, bndrng[0], bndrng[1], maxobjsize)
- : warning_at (loc, opt,
- (maybe
- ? G_("specified size between %E and %E "
- "may exceed maximum object size %E")
- : G_("specified size between %E and %E "
- "exceeds maximum object size %E")),
- bndrng[0], bndrng[1], maxobjsize));
- }
- else if (!size || tree_int_cst_le (bndrng[0], size))
- return false;
- else if (tree_int_cst_equal (bndrng[0], bndrng[1]))
- warned = (func
- ? warning_at (loc, opt,
- (maybe
- ? G_("%qD specified bound %E may exceed "
- "destination size %E")
- : G_("%qD specified bound %E exceeds "
- "destination size %E")),
- func, bndrng[0], size)
- : warning_at (loc, opt,
- (maybe
- ? G_("specified bound %E may exceed "
- "destination size %E")
- : G_("specified bound %E exceeds "
- "destination size %E")),
- bndrng[0], size));
- else
- warned = (func
- ? warning_at (loc, opt,
- (maybe
- ? G_("%qD specified bound [%E, %E] may exceed "
- "destination size %E")
- : G_("%qD specified bound [%E, %E] exceeds "
- "destination size %E")),
- func, bndrng[0], bndrng[1], size)
- : warning_at (loc, opt,
- (maybe
- ? G_("specified bound [%E, %E] exceeds "
- "destination size %E")
- : G_("specified bound [%E, %E] exceeds "
- "destination size %E")),
- bndrng[0], bndrng[1], size));
-
- if (warned)
- {
- if (pad && pad->dst.ref)
- {
- if (DECL_P (pad->dst.ref))
- inform (DECL_SOURCE_LOCATION (pad->dst.ref),
- "destination object declared here");
- else if (EXPR_HAS_LOCATION (pad->dst.ref))
- inform (EXPR_LOCATION (pad->dst.ref),
- "destination object allocated here");
- }
- suppress_warning (exp, opt);
- }
+ if (!warn_stringop_overread)
+ return true;
- return warned;
+ if (bound && !useless_type_conversion_p (size_type_node, TREE_TYPE (bound)))
+ bound = fold_convert (size_type_node, bound);
+ access_data data (exp, access_read_only, NULL_TREE, false, bound, true);
+ compute_objsize (src, ost, &data.src);
+ return check_access (exp, /*dstwrite=*/ NULL_TREE, /*maxread=*/ bound,
+ /*srcstr=*/ src, /*dstsize=*/ NULL_TREE, data.mode,
+ &data);
}
-/* For an expression EXP issue an access warning controlled by option OPT
- with access to a region SIZE bytes in size in the RANGE of sizes.
- WRITE is true for a write access, READ for a read access, neither for
- call that may or may not perform an access but for which the range
- is expected to valid.
- Returns true when a warning has been issued. */
+/* Helper to determine and check the sizes of the source and the destination
+ of calls to __builtin_{bzero,memcpy,mempcpy,memset} calls. EXP is the
+ call expression, DEST is the destination argument, SRC is the source
+ argument or null, and LEN is the number of bytes. Use Object Size type-0
+ regardless of the OPT_Wstringop_overflow_ setting. Return true on success
+ (no overflow or invalid sizes), false otherwise. */
static bool
-warn_for_access (location_t loc, tree func, tree exp, int opt, tree range[2],
- tree size, bool write, bool read, bool maybe)
-{
- bool warned = false;
-
- if (write && read)
- {
- if (tree_int_cst_equal (range[0], range[1]))
- warned = (func
- ? warning_n (loc, opt, tree_to_uhwi (range[0]),
- (maybe
- ? G_("%qD may access %E byte in a region "
- "of size %E")
- : G_("%qD accessing %E byte in a region "
- "of size %E")),
- (maybe
- ? G_ ("%qD may access %E bytes in a region "
- "of size %E")
- : G_ ("%qD accessing %E bytes in a region "
- "of size %E")),
- func, range[0], size)
- : warning_n (loc, opt, tree_to_uhwi (range[0]),
- (maybe
- ? G_("may access %E byte in a region "
- "of size %E")
- : G_("accessing %E byte in a region "
- "of size %E")),
- (maybe
- ? G_("may access %E bytes in a region "
- "of size %E")
- : G_("accessing %E bytes in a region "
- "of size %E")),
- range[0], size));
- else if (tree_int_cst_sign_bit (range[1]))
- {
- /* Avoid printing the upper bound if it's invalid. */
- warned = (func
- ? warning_at (loc, opt,
- (maybe
- ? G_("%qD may access %E or more bytes "
- "in a region of size %E")
- : G_("%qD accessing %E or more bytes "
- "in a region of size %E")),
- func, range[0], size)
- : warning_at (loc, opt,
- (maybe
- ? G_("may access %E or more bytes "
- "in a region of size %E")
- : G_("accessing %E or more bytes "
- "in a region of size %E")),
- range[0], size));
- }
- else
- warned = (func
- ? warning_at (loc, opt,
- (maybe
- ? G_("%qD may access between %E and %E "
- "bytes in a region of size %E")
- : G_("%qD accessing between %E and %E "
- "bytes in a region of size %E")),
- func, range[0], range[1], size)
- : warning_at (loc, opt,
- (maybe
- ? G_("may access between %E and %E bytes "
- "in a region of size %E")
- : G_("accessing between %E and %E bytes "
- "in a region of size %E")),
- range[0], range[1], size));
- return warned;
- }
-
- if (write)
- {
- if (tree_int_cst_equal (range[0], range[1]))
- warned = (func
- ? warning_n (loc, opt, tree_to_uhwi (range[0]),
- (maybe
- ? G_("%qD may write %E byte into a region "
- "of size %E")
- : G_("%qD writing %E byte into a region "
- "of size %E overflows the destination")),
- (maybe
- ? G_("%qD may write %E bytes into a region "
- "of size %E")
- : G_("%qD writing %E bytes into a region "
- "of size %E overflows the destination")),
- func, range[0], size)
- : warning_n (loc, opt, tree_to_uhwi (range[0]),
- (maybe
- ? G_("may write %E byte into a region "
- "of size %E")
- : G_("writing %E byte into a region "
- "of size %E overflows the destination")),
- (maybe
- ? G_("may write %E bytes into a region "
- "of size %E")
- : G_("writing %E bytes into a region "
- "of size %E overflows the destination")),
- range[0], size));
- else if (tree_int_cst_sign_bit (range[1]))
- {
- /* Avoid printing the upper bound if it's invalid. */
- warned = (func
- ? warning_at (loc, opt,
- (maybe
- ? G_("%qD may write %E or more bytes "
- "into a region of size %E")
- : G_("%qD writing %E or more bytes "
- "into a region of size %E overflows "
- "the destination")),
- func, range[0], size)
- : warning_at (loc, opt,
- (maybe
- ? G_("may write %E or more bytes into "
- "a region of size %E")
- : G_("writing %E or more bytes into "
- "a region of size %E overflows "
- "the destination")),
- range[0], size));
- }
- else
- warned = (func
- ? warning_at (loc, opt,
- (maybe
- ? G_("%qD may write between %E and %E bytes "
- "into a region of size %E")
- : G_("%qD writing between %E and %E bytes "
- "into a region of size %E overflows "
- "the destination")),
- func, range[0], range[1], size)
- : warning_at (loc, opt,
- (maybe
- ? G_("may write between %E and %E bytes "
- "into a region of size %E")
- : G_("writing between %E and %E bytes "
- "into a region of size %E overflows "
- "the destination")),
- range[0], range[1], size));
- return warned;
- }
-
- if (read)
- {
- if (tree_int_cst_equal (range[0], range[1]))
- warned = (func
- ? warning_n (loc, OPT_Wstringop_overread,
- tree_to_uhwi (range[0]),
- (maybe
- ? G_("%qD may read %E byte from a region "
- "of size %E")
- : G_("%qD reading %E byte from a region "
- "of size %E")),
- (maybe
- ? G_("%qD may read %E bytes from a region "
- "of size %E")
- : G_("%qD reading %E bytes from a region "
- "of size %E")),
- func, range[0], size)
- : warning_n (loc, OPT_Wstringop_overread,
- tree_to_uhwi (range[0]),
- (maybe
- ? G_("may read %E byte from a region "
- "of size %E")
- : G_("reading %E byte from a region "
- "of size %E")),
- (maybe
- ? G_("may read %E bytes from a region "
- "of size %E")
- : G_("reading %E bytes from a region "
- "of size %E")),
- range[0], size));
- else if (tree_int_cst_sign_bit (range[1]))
- {
- /* Avoid printing the upper bound if it's invalid. */
- warned = (func
- ? warning_at (loc, OPT_Wstringop_overread,
- (maybe
- ? G_("%qD may read %E or more bytes "
- "from a region of size %E")
- : G_("%qD reading %E or more bytes "
- "from a region of size %E")),
- func, range[0], size)
- : warning_at (loc, OPT_Wstringop_overread,
- (maybe
- ? G_("may read %E or more bytes "
- "from a region of size %E")
- : G_("reading %E or more bytes "
- "from a region of size %E")),
- range[0], size));
- }
- else
- warned = (func
- ? warning_at (loc, OPT_Wstringop_overread,
- (maybe
- ? G_("%qD may read between %E and %E bytes "
- "from a region of size %E")
- : G_("%qD reading between %E and %E bytes "
- "from a region of size %E")),
- func, range[0], range[1], size)
- : warning_at (loc, opt,
- (maybe
- ? G_("may read between %E and %E bytes "
- "from a region of size %E")
- : G_("reading between %E and %E bytes "
- "from a region of size %E")),
- range[0], range[1], size));
-
- if (warned)
- suppress_warning (exp, OPT_Wstringop_overread);
-
- return warned;
- }
-
- if (tree_int_cst_equal (range[0], range[1])
- || tree_int_cst_sign_bit (range[1]))
- warned = (func
- ? warning_n (loc, OPT_Wstringop_overread,
- tree_to_uhwi (range[0]),
- "%qD expecting %E byte in a region of size %E",
- "%qD expecting %E bytes in a region of size %E",
- func, range[0], size)
- : warning_n (loc, OPT_Wstringop_overread,
- tree_to_uhwi (range[0]),
- "expecting %E byte in a region of size %E",
- "expecting %E bytes in a region of size %E",
- range[0], size));
- else if (tree_int_cst_sign_bit (range[1]))
- {
- /* Avoid printing the upper bound if it's invalid. */
- warned = (func
- ? warning_at (loc, OPT_Wstringop_overread,
- "%qD expecting %E or more bytes in a region "
- "of size %E",
- func, range[0], size)
- : warning_at (loc, OPT_Wstringop_overread,
- "expecting %E or more bytes in a region "
- "of size %E",
- range[0], size));
- }
- else
- warned = (func
- ? warning_at (loc, OPT_Wstringop_overread,
- "%qD expecting between %E and %E bytes in "
- "a region of size %E",
- func, range[0], range[1], size)
- : warning_at (loc, OPT_Wstringop_overread,
- "expecting between %E and %E bytes in "
- "a region of size %E",
- range[0], range[1], size));
-
- if (warned)
- suppress_warning (exp, OPT_Wstringop_overread);
+check_memop_access (tree exp, tree dest, tree src, tree size)
+{
+ /* For functions like memset and memcpy that operate on raw memory
+ try to determine the size of the largest source and destination
+ object using type-0 Object Size regardless of the object size
+ type specified by the option. */
+ access_data data (exp, access_read_write);
+ tree srcsize = src ? compute_objsize (src, 0, &data.src) : NULL_TREE;
+ tree dstsize = compute_objsize (dest, 0, &data.dst);
- return warned;
+ return check_access (exp, size, /*maxread=*/NULL_TREE,
+ srcsize, dstsize, data.mode, &data);
}
-/* Issue one inform message describing each target of an access REF.
- WRITE is set for a write access and clear for a read access. */
+/* Validate memchr arguments without performing any expansion.
+ Return NULL_RTX. */
-void
-access_ref::inform_access (access_mode mode) const
+static rtx
+expand_builtin_memchr (tree exp, rtx)
{
- const access_ref &aref = *this;
- if (!aref.ref)
- return;
-
- if (aref.phi ())
- {
- /* Set MAXREF to refer to the largest object and fill ALL_REFS
- with data for all objects referenced by the PHI arguments. */
- access_ref maxref;
- auto_vec<access_ref> all_refs;
- if (!get_ref (&all_refs, &maxref))
- return;
-
- /* Except for MAXREF, the rest of the arguments' offsets need not
- reflect one added to the PHI itself. Determine the latter from
- MAXREF on which the result is based. */
- const offset_int orng[] =
- {
- offrng[0] - maxref.offrng[0],
- wi::smax (offrng[1] - maxref.offrng[1], offrng[0]),
- };
-
- /* Add the final PHI's offset to that of each of the arguments
- and recurse to issue an inform message for it. */
- for (unsigned i = 0; i != all_refs.length (); ++i)
- {
- /* Skip any PHIs; those could lead to infinite recursion. */
- if (all_refs[i].phi ())
- continue;
-
- all_refs[i].add_offset (orng[0], orng[1]);
- all_refs[i].inform_access (mode);
- }
- return;
- }
-
- /* Convert offset range and avoid including a zero range since it
- isn't necessarily meaningful. */
- HOST_WIDE_INT diff_min = tree_to_shwi (TYPE_MIN_VALUE (ptrdiff_type_node));
- HOST_WIDE_INT diff_max = tree_to_shwi (TYPE_MAX_VALUE (ptrdiff_type_node));
- HOST_WIDE_INT minoff;
- HOST_WIDE_INT maxoff = diff_max;
- if (wi::fits_shwi_p (aref.offrng[0]))
- minoff = aref.offrng[0].to_shwi ();
- else
- minoff = aref.offrng[0] < 0 ? diff_min : diff_max;
-
- if (wi::fits_shwi_p (aref.offrng[1]))
- maxoff = aref.offrng[1].to_shwi ();
-
- if (maxoff <= diff_min || maxoff >= diff_max)
- /* Avoid mentioning an upper bound that's equal to or in excess
- of the maximum of ptrdiff_t. */
- maxoff = minoff;
+ if (!validate_arglist (exp,
+ POINTER_TYPE, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ return NULL_RTX;
- /* Convert size range and always include it since all sizes are
- meaningful. */
- unsigned long long minsize = 0, maxsize = 0;
- if (wi::fits_shwi_p (aref.sizrng[0])
- && wi::fits_shwi_p (aref.sizrng[1]))
- {
- minsize = aref.sizrng[0].to_shwi ();
- maxsize = aref.sizrng[1].to_shwi ();
- }
+ tree arg1 = CALL_EXPR_ARG (exp, 0);
+ tree len = CALL_EXPR_ARG (exp, 2);
- /* SIZRNG doesn't necessarily have the same range as the allocation
- size determined by gimple_call_alloc_size (). */
- char sizestr[80];
- if (minsize == maxsize)
- sprintf (sizestr, "%llu", minsize);
- else
- sprintf (sizestr, "[%llu, %llu]", minsize, maxsize);
-
- char offstr[80];
- if (minoff == 0
- && (maxoff == 0 || aref.sizrng[1] <= maxoff))
- offstr[0] = '\0';
- else if (minoff == maxoff)
- sprintf (offstr, "%lli", (long long) minoff);
- else
- sprintf (offstr, "[%lli, %lli]", (long long) minoff, (long long) maxoff);
+ check_read_access (exp, arg1, len, 0);
- location_t loc = UNKNOWN_LOCATION;
+ return NULL_RTX;
+}
- tree ref = this->ref;
- tree allocfn = NULL_TREE;
- if (TREE_CODE (ref) == SSA_NAME)
- {
- gimple *stmt = SSA_NAME_DEF_STMT (ref);
- if (is_gimple_call (stmt))
- {
- loc = gimple_location (stmt);
- if (gimple_call_builtin_p (stmt, BUILT_IN_ALLOCA_WITH_ALIGN))
- {
- /* Strip the SSA_NAME suffix from the variable name and
- recreate an identifier with the VLA's original name. */
- ref = gimple_call_lhs (stmt);
- if (SSA_NAME_IDENTIFIER (ref))
- {
- ref = SSA_NAME_IDENTIFIER (ref);
- const char *id = IDENTIFIER_POINTER (ref);
- size_t len = strcspn (id, ".$");
- if (!len)
- len = strlen (id);
- ref = get_identifier_with_length (id, len);
- }
- }
- else
- {
- /* Except for VLAs, retrieve the allocation function. */
- allocfn = gimple_call_fndecl (stmt);
- if (!allocfn)
- allocfn = gimple_call_fn (stmt);
- if (TREE_CODE (allocfn) == SSA_NAME)
- {
- /* For an ALLOC_CALL via a function pointer make a small
- effort to determine the destination of the pointer. */
- gimple *def = SSA_NAME_DEF_STMT (allocfn);
- if (gimple_assign_single_p (def))
- {
- tree rhs = gimple_assign_rhs1 (def);
- if (DECL_P (rhs))
- allocfn = rhs;
- else if (TREE_CODE (rhs) == COMPONENT_REF)
- allocfn = TREE_OPERAND (rhs, 1);
- }
- }
- }
- }
- else if (gimple_nop_p (stmt))
- /* Handle DECL_PARM below. */
- ref = SSA_NAME_VAR (ref);
- }
+/* Expand a call EXP to the memcpy builtin.
+ Return NULL_RTX if we failed, the caller should emit a normal call,
+ otherwise try to get the result in TARGET, if convenient (and in
+ mode MODE if that's convenient). */
- if (DECL_P (ref))
- loc = DECL_SOURCE_LOCATION (ref);
- else if (EXPR_P (ref) && EXPR_HAS_LOCATION (ref))
- loc = EXPR_LOCATION (ref);
- else if (TREE_CODE (ref) != IDENTIFIER_NODE
- && TREE_CODE (ref) != SSA_NAME)
- return;
+static rtx
+expand_builtin_memcpy (tree exp, rtx target)
+{
+ if (!validate_arglist (exp,
+ POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ return NULL_RTX;
- if (mode == access_read_write || mode == access_write_only)
- {
- if (allocfn == NULL_TREE)
- {
- if (*offstr)
- inform (loc, "at offset %s into destination object %qE of size %s",
- offstr, ref, sizestr);
- else
- inform (loc, "destination object %qE of size %s", ref, sizestr);
- return;
- }
+ tree dest = CALL_EXPR_ARG (exp, 0);
+ tree src = CALL_EXPR_ARG (exp, 1);
+ tree len = CALL_EXPR_ARG (exp, 2);
- if (*offstr)
- inform (loc,
- "at offset %s into destination object of size %s "
- "allocated by %qE", offstr, sizestr, allocfn);
- else
- inform (loc, "destination object of size %s allocated by %qE",
- sizestr, allocfn);
- return;
- }
+ check_memop_access (exp, dest, src, len);
- if (mode == access_read_only)
- {
- if (allocfn == NULL_TREE)
- {
- if (*offstr)
- inform (loc, "at offset %s into source object %qE of size %s",
- offstr, ref, sizestr);
- else
- inform (loc, "source object %qE of size %s", ref, sizestr);
+ return expand_builtin_memory_copy_args (dest, src, len, target, exp,
+ /*retmode=*/ RETURN_BEGIN, false);
+}
- return;
- }
+/* Check a call EXP to the memmove built-in for validity.
+ Return NULL_RTX on both success and failure. */
- if (*offstr)
- inform (loc,
- "at offset %s into source object of size %s allocated by %qE",
- offstr, sizestr, allocfn);
- else
- inform (loc, "source object of size %s allocated by %qE",
- sizestr, allocfn);
- return;
- }
+static rtx
+expand_builtin_memmove (tree exp, rtx target)
+{
+ if (!validate_arglist (exp,
+ POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ return NULL_RTX;
- if (allocfn == NULL_TREE)
- {
- if (*offstr)
- inform (loc, "at offset %s into object %qE of size %s",
- offstr, ref, sizestr);
- else
- inform (loc, "object %qE of size %s", ref, sizestr);
+ tree dest = CALL_EXPR_ARG (exp, 0);
+ tree src = CALL_EXPR_ARG (exp, 1);
+ tree len = CALL_EXPR_ARG (exp, 2);
- return;
- }
+ check_memop_access (exp, dest, src, len);
- if (*offstr)
- inform (loc,
- "at offset %s into object of size %s allocated by %qE",
- offstr, sizestr, allocfn);
- else
- inform (loc, "object of size %s allocated by %qE",
- sizestr, allocfn);
+ return expand_builtin_memory_copy_args (dest, src, len, target, exp,
+ /*retmode=*/ RETURN_BEGIN, true);
}
-/* Helper to set RANGE to the range of BOUND if it's nonnull, bounded
- by BNDRNG if nonnull and valid. */
+/* Expand a call EXP to the mempcpy builtin.
+ Return NULL_RTX if we failed; the caller should emit a normal call,
+ otherwise try to get the result in TARGET, if convenient (and in
+ mode MODE if that's convenient). */
-static void
-get_size_range (tree bound, tree range[2], const offset_int bndrng[2])
+static rtx
+expand_builtin_mempcpy (tree exp, rtx target)
{
- if (bound)
- get_size_range (bound, range);
-
- if (!bndrng || (bndrng[0] == 0 && bndrng[1] == HOST_WIDE_INT_M1U))
- return;
+ if (!validate_arglist (exp,
+ POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ return NULL_RTX;
- if (range[0] && TREE_CODE (range[0]) == INTEGER_CST)
- {
- offset_int r[] =
- { wi::to_offset (range[0]), wi::to_offset (range[1]) };
- if (r[0] < bndrng[0])
- range[0] = wide_int_to_tree (sizetype, bndrng[0]);
- if (bndrng[1] < r[1])
- range[1] = wide_int_to_tree (sizetype, bndrng[1]);
- }
- else
- {
- range[0] = wide_int_to_tree (sizetype, bndrng[0]);
- range[1] = wide_int_to_tree (sizetype, bndrng[1]);
- }
-}
+ tree dest = CALL_EXPR_ARG (exp, 0);
+ tree src = CALL_EXPR_ARG (exp, 1);
+ tree len = CALL_EXPR_ARG (exp, 2);
-/* Try to verify that the sizes and lengths of the arguments to a string
- manipulation function given by EXP are within valid bounds and that
- the operation does not lead to buffer overflow or read past the end.
- Arguments other than EXP may be null. When non-null, the arguments
- have the following meaning:
- DST is the destination of a copy call or NULL otherwise.
- SRC is the source of a copy call or NULL otherwise.
- DSTWRITE is the number of bytes written into the destination obtained
- from the user-supplied size argument to the function (such as in
- memcpy(DST, SRCs, DSTWRITE) or strncpy(DST, DRC, DSTWRITE).
- MAXREAD is the user-supplied bound on the length of the source sequence
- (such as in strncat(d, s, N). It specifies the upper limit on the number
- of bytes to write. If NULL, it's taken to be the same as DSTWRITE.
- SRCSTR is the source string (such as in strcpy(DST, SRC)) when the
- expression EXP is a string function call (as opposed to a memory call
- like memcpy). As an exception, SRCSTR can also be an integer denoting
- the precomputed size of the source string or object (for functions like
- memcpy).
- DSTSIZE is the size of the destination object.
+ /* Policy does not generally allow using compute_objsize (which
+ is used internally by check_memop_size) to change code generation
+ or drive optimization decisions.
- When DSTWRITE is null LEN is checked to verify that it doesn't exceed
- SIZE_MAX.
+ In this instance it is safe because the code we generate has
+ the same semantics regardless of the return value of
+ check_memop_sizes. Exactly the same amount of data is copied
+ and the return value is exactly the same in both cases.
- WRITE is true for write accesses, READ is true for reads. Both are
- false for simple size checks in calls to functions that neither read
- from nor write to the region.
+ Furthermore, check_memop_size always uses mode 0 for the call to
+ compute_objsize, so the imprecise nature of compute_objsize is
+ avoided. */
- When nonnull, PAD points to a more detailed description of the access.
+ /* Avoid expanding mempcpy into memcpy when the call is determined
+ to overflow the buffer. This also prevents the same overflow
+ from being diagnosed again when expanding memcpy. */
+ if (!check_memop_access (exp, dest, src, len))
+ return NULL_RTX;
- If the call is successfully verified as safe return true, otherwise
- return false. */
+ return expand_builtin_mempcpy_args (dest, src, len,
+ target, exp, /*retmode=*/ RETURN_END);
+}
-bool
-check_access (tree exp, tree dstwrite,
- tree maxread, tree srcstr, tree dstsize,
- access_mode mode, const access_data *pad /* = NULL */)
-{
- /* The size of the largest object is half the address space, or
- PTRDIFF_MAX. (This is way too permissive.) */
- tree maxobjsize = max_object_size ();
-
- /* Either an approximate/minimum the length of the source string for
- string functions or the size of the source object for raw memory
- functions. */
- tree slen = NULL_TREE;
-
- /* The range of the access in bytes; first set to the write access
- for functions that write and then read for those that also (or
- just) read. */
- tree range[2] = { NULL_TREE, NULL_TREE };
-
- /* Set to true when the exact number of bytes written by a string
- function like strcpy is not known and the only thing that is
- known is that it must be at least one (for the terminating nul). */
- bool at_least_one = false;
- if (srcstr)
- {
- /* SRCSTR is normally a pointer to string but as a special case
- it can be an integer denoting the length of a string. */
- if (POINTER_TYPE_P (TREE_TYPE (srcstr)))
- {
- if (!check_nul_terminated_array (exp, srcstr, maxread))
- return false;
- /* Try to determine the range of lengths the source string
- refers to. If it can be determined and is less than
- the upper bound given by MAXREAD add one to it for
- the terminating nul. Otherwise, set it to one for
- the same reason, or to MAXREAD as appropriate. */
- c_strlen_data lendata = { };
- get_range_strlen (srcstr, &lendata, /* eltsize = */ 1);
- range[0] = lendata.minlen;
- range[1] = lendata.maxbound ? lendata.maxbound : lendata.maxlen;
- if (range[0]
- && TREE_CODE (range[0]) == INTEGER_CST
- && TREE_CODE (range[1]) == INTEGER_CST
- && (!maxread || TREE_CODE (maxread) == INTEGER_CST))
- {
- if (maxread && tree_int_cst_le (maxread, range[0]))
- range[0] = range[1] = maxread;
- else
- range[0] = fold_build2 (PLUS_EXPR, size_type_node,
- range[0], size_one_node);
+/* Helper function to do the actual work for expand of memory copy family
+ functions (memcpy, mempcpy, stpcpy). Expansing should assign LEN bytes
+ of memory from SRC to DEST and assign to TARGET if convenient. Return
+ value is based on RETMODE argument. */
- if (maxread && tree_int_cst_le (maxread, range[1]))
- range[1] = maxread;
- else if (!integer_all_onesp (range[1]))
- range[1] = fold_build2 (PLUS_EXPR, size_type_node,
- range[1], size_one_node);
+static rtx
+expand_builtin_memory_copy_args (tree dest, tree src, tree len,
+ rtx target, tree exp, memop_ret retmode,
+ bool might_overlap)
+{
+ unsigned int src_align = get_pointer_alignment (src);
+ unsigned int dest_align = get_pointer_alignment (dest);
+ rtx dest_mem, src_mem, dest_addr, len_rtx;
+ HOST_WIDE_INT expected_size = -1;
+ unsigned int expected_align = 0;
+ unsigned HOST_WIDE_INT min_size;
+ unsigned HOST_WIDE_INT max_size;
+ unsigned HOST_WIDE_INT probable_max_size;
- slen = range[0];
- }
- else
- {
- at_least_one = true;
- slen = size_one_node;
- }
- }
- else
- slen = srcstr;
- }
+ bool is_move_done;
- if (!dstwrite && !maxread)
- {
- /* When the only available piece of data is the object size
- there is nothing to do. */
- if (!slen)
- return true;
+ /* If DEST is not a pointer type, call the normal function. */
+ if (dest_align == 0)
+ return NULL_RTX;
- /* Otherwise, when the length of the source sequence is known
- (as with strlen), set DSTWRITE to it. */
- if (!range[0])
- dstwrite = slen;
- }
+ /* If either SRC is not a pointer type, don't do this
+ operation in-line. */
+ if (src_align == 0)
+ return NULL_RTX;
- if (!dstsize)
- dstsize = maxobjsize;
+ if (currently_expanding_gimple_stmt)
+ stringop_block_profile (currently_expanding_gimple_stmt,
+ &expected_align, &expected_size);
- /* Set RANGE to that of DSTWRITE if non-null, bounded by PAD->DST.BNDRNG
- if valid. */
- get_size_range (dstwrite, range, pad ? pad->dst.bndrng : NULL);
+ if (expected_align < dest_align)
+ expected_align = dest_align;
+ dest_mem = get_memory_rtx (dest, len);
+ set_mem_align (dest_mem, dest_align);
+ len_rtx = expand_normal (len);
+ determine_block_size (len, len_rtx, &min_size, &max_size,
+ &probable_max_size);
- tree func = get_callee_fndecl (exp);
- /* Read vs write access by built-ins can be determined from the const
- qualifiers on the pointer argument. In the absence of attribute
- access, non-const qualified pointer arguments to user-defined
- functions are assumed to both read and write the objects. */
- const bool builtin = func ? fndecl_built_in_p (func) : false;
+ /* Try to get the byte representation of the constant SRC points to,
+ with its byte size in NBYTES. */
+ unsigned HOST_WIDE_INT nbytes;
+ const char *rep = getbyterep (src, &nbytes);
- /* First check the number of bytes to be written against the maximum
- object size. */
- if (range[0]
- && TREE_CODE (range[0]) == INTEGER_CST
- && tree_int_cst_lt (maxobjsize, range[0]))
- {
- location_t loc = EXPR_LOCATION (exp);
- maybe_warn_for_bound (OPT_Wstringop_overflow_, loc, exp, func, range,
- NULL_TREE, pad);
- return false;
- }
-
- /* The number of bytes to write is "exact" if DSTWRITE is non-null,
- constant, and in range of unsigned HOST_WIDE_INT. */
- bool exactwrite = dstwrite && tree_fits_uhwi_p (dstwrite);
-
- /* Next check the number of bytes to be written against the destination
- object size. */
- if (range[0] || !exactwrite || integer_all_onesp (dstwrite))
+ /* If the function's constant bound LEN_RTX is less than or equal
+ to the byte size of the representation of the constant argument,
+ and if block move would be done by pieces, we can avoid loading
+ the bytes from memory and only store the computed constant.
+ This works in the overlap (memmove) case as well because
+ store_by_pieces just generates a series of stores of constants
+ from the representation returned by getbyterep(). */
+ if (rep
+ && CONST_INT_P (len_rtx)
+ && (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= nbytes
+ && can_store_by_pieces (INTVAL (len_rtx), builtin_memcpy_read_str,
+ CONST_CAST (char *, rep),
+ dest_align, false))
{
- if (range[0]
- && TREE_CODE (range[0]) == INTEGER_CST
- && ((tree_fits_uhwi_p (dstsize)
- && tree_int_cst_lt (dstsize, range[0]))
- || (dstwrite
- && tree_fits_uhwi_p (dstwrite)
- && tree_int_cst_lt (dstwrite, range[0]))))
- {
- const opt_code opt = OPT_Wstringop_overflow_;
- if (warning_suppressed_p (exp, opt)
- || (pad && pad->dst.ref
- && warning_suppressed_p (pad->dst.ref, opt)))
- return false;
-
- location_t loc = EXPR_LOCATION (exp);
- bool warned = false;
- if (dstwrite == slen && at_least_one)
- {
- /* This is a call to strcpy with a destination of 0 size
- and a source of unknown length. The call will write
- at least one byte past the end of the destination. */
- warned = (func
- ? warning_at (loc, opt,
- "%qD writing %E or more bytes into "
- "a region of size %E overflows "
- "the destination",
- func, range[0], dstsize)
- : warning_at (loc, opt,
- "writing %E or more bytes into "
- "a region of size %E overflows "
- "the destination",
- range[0], dstsize));
- }
- else
- {
- const bool read
- = mode == access_read_only || mode == access_read_write;
- const bool write
- = mode == access_write_only || mode == access_read_write;
- const bool maybe = pad && pad->dst.parmarray;
- warned = warn_for_access (loc, func, exp,
- OPT_Wstringop_overflow_,
- range, dstsize,
- write, read && !builtin, maybe);
- }
-
- if (warned)
- {
- suppress_warning (exp, OPT_Wstringop_overflow_);
- if (pad)
- pad->dst.inform_access (pad->mode);
- }
-
- /* Return error when an overflow has been detected. */
- return false;
- }
+ dest_mem = store_by_pieces (dest_mem, INTVAL (len_rtx),
+ builtin_memcpy_read_str,
+ CONST_CAST (char *, rep),
+ dest_align, false, retmode);
+ dest_mem = force_operand (XEXP (dest_mem, 0), target);
+ dest_mem = convert_memory_address (ptr_mode, dest_mem);
+ return dest_mem;
}
- /* Check the maximum length of the source sequence against the size
- of the destination object if known, or against the maximum size
- of an object. */
- if (maxread)
- {
- /* Set RANGE to that of MAXREAD, bounded by PAD->SRC.BNDRNG if
- PAD is nonnull and BNDRNG is valid. */
- get_size_range (maxread, range, pad ? pad->src.bndrng : NULL);
+ src_mem = get_memory_rtx (src, len);
+ set_mem_align (src_mem, src_align);
- location_t loc = EXPR_LOCATION (exp);
- tree size = dstsize;
- if (pad && pad->mode == access_read_only)
- size = wide_int_to_tree (sizetype, pad->src.sizrng[1]);
+ /* Copy word part most expediently. */
+ enum block_op_methods method = BLOCK_OP_NORMAL;
+ if (CALL_EXPR_TAILCALL (exp)
+ && (retmode == RETURN_BEGIN || target == const0_rtx))
+ method = BLOCK_OP_TAILCALL;
+ bool use_mempcpy_call = (targetm.libc_has_fast_function (BUILT_IN_MEMPCPY)
+ && retmode == RETURN_END
+ && !might_overlap
+ && target != const0_rtx);
+ if (use_mempcpy_call)
+ method = BLOCK_OP_NO_LIBCALL_RET;
+ dest_addr = emit_block_move_hints (dest_mem, src_mem, len_rtx, method,
+ expected_align, expected_size,
+ min_size, max_size, probable_max_size,
+ use_mempcpy_call, &is_move_done,
+ might_overlap);
- if (range[0] && maxread && tree_fits_uhwi_p (size))
- {
- if (tree_int_cst_lt (maxobjsize, range[0]))
- {
- maybe_warn_for_bound (OPT_Wstringop_overread, loc, exp, func,
- range, size, pad);
- return false;
- }
+ /* Bail out when a mempcpy call would be expanded as libcall and when
+ we have a target that provides a fast implementation
+ of mempcpy routine. */
+ if (!is_move_done)
+ return NULL_RTX;
- if (size != maxobjsize && tree_int_cst_lt (size, range[0]))
- {
- opt_code opt = (dstwrite || mode != access_read_only
- ? OPT_Wstringop_overflow_
- : OPT_Wstringop_overread);
- maybe_warn_for_bound (opt, loc, exp, func, range, size, pad);
- return false;
- }
- }
+ if (dest_addr == pc_rtx)
+ return NULL_RTX;
- maybe_warn_nonstring_arg (func, exp);
- }
-
- /* Check for reading past the end of SRC. */
- bool overread = (slen
- && slen == srcstr
- && dstwrite
- && range[0]
- && TREE_CODE (slen) == INTEGER_CST
- && tree_int_cst_lt (slen, range[0]));
- /* If none is determined try to get a better answer based on the details
- in PAD. */
- if (!overread
- && pad
- && pad->src.sizrng[1] >= 0
- && pad->src.offrng[0] >= 0
- && (pad->src.offrng[1] < 0
- || pad->src.offrng[0] <= pad->src.offrng[1]))
- {
- /* Set RANGE to that of MAXREAD, bounded by PAD->SRC.BNDRNG if
- PAD is nonnull and BNDRNG is valid. */
- get_size_range (maxread, range, pad ? pad->src.bndrng : NULL);
- /* Set OVERREAD for reads starting just past the end of an object. */
- overread = pad->src.sizrng[1] - pad->src.offrng[0] < pad->src.bndrng[0];
- range[0] = wide_int_to_tree (sizetype, pad->src.bndrng[0]);
- slen = size_zero_node;
- }
-
- if (overread)
- {
- const opt_code opt = OPT_Wstringop_overread;
- if (warning_suppressed_p (exp, opt)
- || (srcstr && warning_suppressed_p (srcstr, opt))
- || (pad && pad->src.ref
- && warning_suppressed_p (pad->src.ref, opt)))
- return false;
+ if (dest_addr == 0)
+ {
+ dest_addr = force_operand (XEXP (dest_mem, 0), target);
+ dest_addr = convert_memory_address (ptr_mode, dest_addr);
+ }
- location_t loc = EXPR_LOCATION (exp);
- const bool read
- = mode == access_read_only || mode == access_read_write;
- const bool maybe = pad && pad->dst.parmarray;
- if (warn_for_access (loc, func, exp, opt, range, slen, false, read,
- maybe))
- {
- suppress_warning (exp, opt);
- if (pad)
- pad->src.inform_access (access_read_only);
- }
- return false;
+ if (retmode != RETURN_BEGIN && target != const0_rtx)
+ {
+ dest_addr = gen_rtx_PLUS (ptr_mode, dest_addr, len_rtx);
+ /* stpcpy pointer to last byte. */
+ if (retmode == RETURN_END_MINUS_ONE)
+ dest_addr = gen_rtx_MINUS (ptr_mode, dest_addr, const1_rtx);
}
- return true;
+ return dest_addr;
}
-/* A convenience wrapper for check_access above to check access
- by a read-only function like puts. */
-
-static bool
-check_read_access (tree exp, tree src, tree bound /* = NULL_TREE */,
- int ost /* = 1 */)
+static rtx
+expand_builtin_mempcpy_args (tree dest, tree src, tree len,
+ rtx target, tree orig_exp, memop_ret retmode)
{
- if (!warn_stringop_overread)
- return true;
-
- if (bound && !useless_type_conversion_p (size_type_node, TREE_TYPE (bound)))
- bound = fold_convert (size_type_node, bound);
- access_data data (exp, access_read_only, NULL_TREE, false, bound, true);
- compute_objsize (src, ost, &data.src);
- return check_access (exp, /*dstwrite=*/ NULL_TREE, /*maxread=*/ bound,
- /*srcstr=*/ src, /*dstsize=*/ NULL_TREE, data.mode,
- &data);
+ return expand_builtin_memory_copy_args (dest, src, len, target, orig_exp,
+ retmode, false);
}
-/* If STMT is a call to an allocation function, returns the constant
- maximum size of the object allocated by the call represented as
- sizetype. If nonnull, sets RNG1[] to the range of the size.
- When nonnull, uses RVALS for range information, otherwise gets global
- range info.
- Returns null when STMT is not a call to a valid allocation function. */
+/* Expand into a movstr instruction, if one is available. Return NULL_RTX if
+ we failed, the caller should emit a normal call, otherwise try to
+ get the result in TARGET, if convenient.
+ Return value is based on RETMODE argument. */
-tree
-gimple_call_alloc_size (gimple *stmt, wide_int rng1[2] /* = NULL */,
- range_query * /* = NULL */)
+static rtx
+expand_movstr (tree dest, tree src, rtx target, memop_ret retmode)
{
- if (!stmt || !is_gimple_call (stmt))
- return NULL_TREE;
-
- tree allocfntype;
- if (tree fndecl = gimple_call_fndecl (stmt))
- allocfntype = TREE_TYPE (fndecl);
- else
- allocfntype = gimple_call_fntype (stmt);
+ class expand_operand ops[3];
+ rtx dest_mem;
+ rtx src_mem;
- if (!allocfntype)
- return NULL_TREE;
+ if (!targetm.have_movstr ())
+ return NULL_RTX;
- unsigned argidx1 = UINT_MAX, argidx2 = UINT_MAX;
- tree at = lookup_attribute ("alloc_size", TYPE_ATTRIBUTES (allocfntype));
- if (!at)
+ dest_mem = get_memory_rtx (dest, NULL);
+ src_mem = get_memory_rtx (src, NULL);
+ if (retmode == RETURN_BEGIN)
{
- if (!gimple_call_builtin_p (stmt, BUILT_IN_ALLOCA_WITH_ALIGN))
- return NULL_TREE;
-
- argidx1 = 0;
+ target = force_reg (Pmode, XEXP (dest_mem, 0));
+ dest_mem = replace_equiv_address (dest_mem, target);
}
- unsigned nargs = gimple_call_num_args (stmt);
+ create_output_operand (&ops[0],
+ retmode != RETURN_BEGIN ? target : NULL_RTX, Pmode);
+ create_fixed_operand (&ops[1], dest_mem);
+ create_fixed_operand (&ops[2], src_mem);
+ if (!maybe_expand_insn (targetm.code_for_movstr, 3, ops))
+ return NULL_RTX;
- if (argidx1 == UINT_MAX)
+ if (retmode != RETURN_BEGIN && target != const0_rtx)
{
- tree atval = TREE_VALUE (at);
- if (!atval)
- return NULL_TREE;
-
- argidx1 = TREE_INT_CST_LOW (TREE_VALUE (atval)) - 1;
- if (nargs <= argidx1)
- return NULL_TREE;
-
- atval = TREE_CHAIN (atval);
- if (atval)
+ target = ops[0].value;
+ /* movstr is supposed to set end to the address of the NUL
+ terminator. If the caller requested a mempcpy-like return value,
+ adjust it. */
+ if (retmode == RETURN_END)
{
- argidx2 = TREE_INT_CST_LOW (TREE_VALUE (atval)) - 1;
- if (nargs <= argidx2)
- return NULL_TREE;
+ rtx tem = plus_constant (GET_MODE (target),
+ gen_lowpart (GET_MODE (target), target), 1);
+ emit_move_insn (target, force_operand (tem, NULL_RTX));
}
}
+ return target;
+}
- tree size = gimple_call_arg (stmt, argidx1);
-
- wide_int rng1_buf[2];
- /* If RNG1 is not set, use the buffer. */
- if (!rng1)
- rng1 = rng1_buf;
-
- /* Use maximum precision to avoid overflow below. */
- const int prec = ADDR_MAX_PRECISION;
-
- {
- tree r[2];
- /* Determine the largest valid range size, including zero. */
- if (!get_size_range (size, r, SR_ALLOW_ZERO | SR_USE_LARGEST))
- return NULL_TREE;
- rng1[0] = wi::to_wide (r[0], prec);
- rng1[1] = wi::to_wide (r[1], prec);
- }
+/* Do some very basic size validation of a call to the strcpy builtin
+ given by EXP. Return NULL_RTX to have the built-in expand to a call
+ to the library function. */
- if (argidx2 > nargs && TREE_CODE (size) == INTEGER_CST)
- return fold_convert (sizetype, size);
+static rtx
+expand_builtin_strcat (tree exp)
+{
+ if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
+ || !warn_stringop_overflow)
+ return NULL_RTX;
- /* To handle ranges do the math in wide_int and return the product
- of the upper bounds as a constant. Ignore anti-ranges. */
- tree n = argidx2 < nargs ? gimple_call_arg (stmt, argidx2) : integer_one_node;
- wide_int rng2[2];
- {
- tree r[2];
- /* As above, use the full non-negative range on failure. */
- if (!get_size_range (n, r, SR_ALLOW_ZERO | SR_USE_LARGEST))
- return NULL_TREE;
- rng2[0] = wi::to_wide (r[0], prec);
- rng2[1] = wi::to_wide (r[1], prec);
- }
+ tree dest = CALL_EXPR_ARG (exp, 0);
+ tree src = CALL_EXPR_ARG (exp, 1);
- /* Compute products of both bounds for the caller but return the lesser
- of SIZE_MAX and the product of the upper bounds as a constant. */
- rng1[0] = rng1[0] * rng2[0];
- rng1[1] = rng1[1] * rng2[1];
+ /* There is no way here to determine the length of the string in
+ the destination to which the SRC string is being appended so
+ just diagnose cases when the souce string is longer than
+ the destination object. */
+ access_data data (exp, access_read_write, NULL_TREE, true,
+ NULL_TREE, true);
+ const int ost = warn_stringop_overflow ? warn_stringop_overflow - 1 : 1;
+ compute_objsize (src, ost, &data.src);
+ tree destsize = compute_objsize (dest, ost, &data.dst);
- const tree size_max = TYPE_MAX_VALUE (sizetype);
- if (wi::gtu_p (rng1[1], wi::to_wide (size_max, prec)))
- {
- rng1[1] = wi::to_wide (size_max, prec);
- return size_max;
- }
+ check_access (exp, /*dstwrite=*/NULL_TREE, /*maxread=*/NULL_TREE,
+ src, destsize, data.mode, &data);
- return wide_int_to_tree (sizetype, rng1[1]);
+ return NULL_RTX;
}
-/* For an access to an object referenced to by the function parameter PTR
- of pointer type, and set RNG[] to the range of sizes of the object
- obtainedfrom the attribute access specification for the current function.
- Set STATIC_ARRAY if the array parameter has been declared [static].
- Return the function parameter on success and null otherwise. */
-
-tree
-gimple_parm_array_size (tree ptr, wide_int rng[2],
- bool *static_array /* = NULL */)
-{
- /* For a function argument try to determine the byte size of the array
- from the current function declaratation (e.g., attribute access or
- related). */
- tree var = SSA_NAME_VAR (ptr);
- if (TREE_CODE (var) != PARM_DECL)
- return NULL_TREE;
+/* Expand expression EXP, which is a call to the strcpy builtin. Return
+ NULL_RTX if we failed the caller should emit a normal call, otherwise
+ try to get the result in TARGET, if convenient (and in mode MODE if that's
+ convenient). */
- const unsigned prec = TYPE_PRECISION (sizetype);
+static rtx
+expand_builtin_strcpy (tree exp, rtx target)
+{
+ if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
+ return NULL_RTX;
- rdwr_map rdwr_idx;
- attr_access *access = get_parm_access (rdwr_idx, var);
- if (!access)
- return NULL_TREE;
+ tree dest = CALL_EXPR_ARG (exp, 0);
+ tree src = CALL_EXPR_ARG (exp, 1);
- if (access->sizarg != UINT_MAX)
+ if (warn_stringop_overflow)
{
- /* TODO: Try to extract the range from the argument based on
- those of subsequent assertions or based on known calls to
- the current function. */
- return NULL_TREE;
+ access_data data (exp, access_read_write, NULL_TREE, true,
+ NULL_TREE, true);
+ const int ost = warn_stringop_overflow ? warn_stringop_overflow - 1 : 1;
+ compute_objsize (src, ost, &data.src);
+ tree dstsize = compute_objsize (dest, ost, &data.dst);
+ check_access (exp, /*dstwrite=*/ NULL_TREE,
+ /*maxread=*/ NULL_TREE, /*srcstr=*/ src,
+ dstsize, data.mode, &data);
}
- if (!access->minsize)
- return NULL_TREE;
-
- /* Only consider ordinary array bound at level 2 (or above if it's
- ever added). */
- if (warn_array_parameter < 2 && !access->static_p)
- return NULL_TREE;
-
- if (static_array)
- *static_array = access->static_p;
-
- rng[0] = wi::zero (prec);
- rng[1] = wi::uhwi (access->minsize, prec);
- /* Multiply the array bound encoded in the attribute by the size
- of what the pointer argument to which it decays points to. */
- tree eltype = TREE_TYPE (TREE_TYPE (ptr));
- tree size = TYPE_SIZE_UNIT (eltype);
- if (!size || TREE_CODE (size) != INTEGER_CST)
- return NULL_TREE;
+ if (rtx ret = expand_builtin_strcpy_args (exp, dest, src, target))
+ {
+ /* Check to see if the argument was declared attribute nonstring
+ and if so, issue a warning since at this point it's not known
+ to be nul-terminated. */
+ tree fndecl = get_callee_fndecl (exp);
+ maybe_warn_nonstring_arg (fndecl, exp);
+ return ret;
+ }
- rng[1] *= wi::to_wide (size, prec);
- return var;
+ return NULL_RTX;
}
-/* Wrapper around the wide_int overload of get_range that accepts
- offset_int instead. For middle end expressions returns the same
- result. For a subset of nonconstamt expressions emitted by the front
- end determines a more precise range than would be possible otherwise. */
+/* Helper function to do the actual work for expand_builtin_strcpy. The
+ arguments to the builtin_strcpy call DEST and SRC are broken out
+ so that this can also be called without constructing an actual CALL_EXPR.
+ The other arguments and return value are the same as for
+ expand_builtin_strcpy. */
-static bool
-get_offset_range (tree x, gimple *stmt, offset_int r[2], range_query *rvals)
+static rtx
+expand_builtin_strcpy_args (tree exp, tree dest, tree src, rtx target)
{
- offset_int add = 0;
- if (TREE_CODE (x) == PLUS_EXPR)
+ /* Detect strcpy calls with unterminated arrays.. */
+ tree size;
+ bool exact;
+ if (tree nonstr = unterminated_array (src, &size, &exact))
{
- /* Handle constant offsets in pointer addition expressions seen
- n the front end IL. */
- tree op = TREE_OPERAND (x, 1);
- if (TREE_CODE (op) == INTEGER_CST)
- {
- op = fold_convert (signed_type_for (TREE_TYPE (op)), op);
- add = wi::to_offset (op);
- x = TREE_OPERAND (x, 0);
- }
+ /* NONSTR refers to the non-nul terminated constant array. */
+ warn_string_no_nul (EXPR_LOCATION (exp), exp, NULL, src, nonstr,
+ size, exact);
+ return NULL_RTX;
}
- if (TREE_CODE (x) == NOP_EXPR)
- /* Also handle conversions to sizetype seen in the front end IL. */
- x = TREE_OPERAND (x, 0);
+ return expand_movstr (dest, src, target, /*retmode=*/ RETURN_BEGIN);
+}
- tree type = TREE_TYPE (x);
- if (!INTEGRAL_TYPE_P (type) && !POINTER_TYPE_P (type))
- return false;
+/* Expand a call EXP to the stpcpy builtin.
+ Return NULL_RTX if we failed the caller should emit a normal call,
+ otherwise try to get the result in TARGET, if convenient (and in
+ mode MODE if that's convenient). */
- if (TREE_CODE (x) != INTEGER_CST
- && TREE_CODE (x) != SSA_NAME)
- {
- if (TYPE_UNSIGNED (type)
- && TYPE_PRECISION (type) == TYPE_PRECISION (sizetype))
- type = signed_type_for (type);
+static rtx
+expand_builtin_stpcpy_1 (tree exp, rtx target, machine_mode mode)
+{
+ tree dst, src;
+ location_t loc = EXPR_LOCATION (exp);
- r[0] = wi::to_offset (TYPE_MIN_VALUE (type)) + add;
- r[1] = wi::to_offset (TYPE_MAX_VALUE (type)) + add;
- return x;
+ if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
+ return NULL_RTX;
+
+ dst = CALL_EXPR_ARG (exp, 0);
+ src = CALL_EXPR_ARG (exp, 1);
+
+ if (warn_stringop_overflow)
+ {
+ access_data data (exp, access_read_write);
+ tree destsize = compute_objsize (dst, warn_stringop_overflow - 1,
+ &data.dst);
+ check_access (exp, /*dstwrite=*/NULL_TREE, /*maxread=*/NULL_TREE,
+ src, destsize, data.mode, &data);
}
- wide_int wr[2];
- if (!get_range (x, stmt, wr, rvals))
- return false;
+ /* If return value is ignored, transform stpcpy into strcpy. */
+ if (target == const0_rtx && builtin_decl_implicit (BUILT_IN_STRCPY))
+ {
+ tree fn = builtin_decl_implicit (BUILT_IN_STRCPY);
+ tree result = build_call_nofold_loc (loc, fn, 2, dst, src);
+ return expand_expr (result, target, mode, EXPAND_NORMAL);
+ }
+ else
+ {
+ tree len, lenp1;
+ rtx ret;
- signop sgn = SIGNED;
- /* Only convert signed integers or unsigned sizetype to a signed
- offset and avoid converting large positive values in narrower
- types to negative offsets. */
- if (TYPE_UNSIGNED (type)
- && wr[0].get_precision () < TYPE_PRECISION (sizetype))
- sgn = UNSIGNED;
+ /* Ensure we get an actual string whose length can be evaluated at
+ compile-time, not an expression containing a string. This is
+ because the latter will potentially produce pessimized code
+ when used to produce the return value. */
+ c_strlen_data lendata = { };
+ if (!c_getstr (src)
+ || !(len = c_strlen (src, 0, &lendata, 1)))
+ return expand_movstr (dst, src, target,
+ /*retmode=*/ RETURN_END_MINUS_ONE);
- r[0] = offset_int::from (wr[0], sgn);
- r[1] = offset_int::from (wr[1], sgn);
- return true;
-}
+ if (lendata.decl)
+ warn_string_no_nul (EXPR_LOCATION (exp), exp, NULL, src, lendata.decl);
-/* Return the argument that the call STMT to a built-in function returns
- or null if it doesn't. On success, set OFFRNG[] to the range of offsets
- from the argument reflected in the value returned by the built-in if it
- can be determined, otherwise to 0 and HWI_M1U respectively. Set
- *PAST_END for functions like mempcpy that might return a past the end
- pointer (most functions return a dereferenceable pointer to an existing
- element of an array). */
+ lenp1 = size_binop_loc (loc, PLUS_EXPR, len, ssize_int (1));
+ ret = expand_builtin_mempcpy_args (dst, src, lenp1,
+ target, exp,
+ /*retmode=*/ RETURN_END_MINUS_ONE);
-static tree
-gimple_call_return_array (gimple *stmt, offset_int offrng[2], bool *past_end,
- range_query *rvals)
-{
- /* Clear and set below for the rare function(s) that might return
- a past-the-end pointer. */
- *past_end = false;
+ if (ret)
+ return ret;
- {
- /* Check for attribute fn spec to see if the function returns one
- of its arguments. */
- attr_fnspec fnspec = gimple_call_fnspec (as_a <gcall *>(stmt));
- unsigned int argno;
- if (fnspec.returns_arg (&argno))
- {
- /* Functions return the first argument (not a range). */
- offrng[0] = offrng[1] = 0;
- return gimple_call_arg (stmt, argno);
- }
- }
+ if (TREE_CODE (len) == INTEGER_CST)
+ {
+ rtx len_rtx = expand_normal (len);
- if (gimple_call_num_args (stmt) < 1)
- return NULL_TREE;
+ if (CONST_INT_P (len_rtx))
+ {
+ ret = expand_builtin_strcpy_args (exp, dst, src, target);
- tree fn = gimple_call_fndecl (stmt);
- if (!gimple_call_builtin_p (stmt, BUILT_IN_NORMAL))
- {
- /* See if this is a call to placement new. */
- if (!fn
- || !DECL_IS_OPERATOR_NEW_P (fn)
- || DECL_IS_REPLACEABLE_OPERATOR_NEW_P (fn))
- return NULL_TREE;
+ if (ret)
+ {
+ if (! target)
+ {
+ if (mode != VOIDmode)
+ target = gen_reg_rtx (mode);
+ else
+ target = gen_reg_rtx (GET_MODE (ret));
+ }
+ if (GET_MODE (target) != GET_MODE (ret))
+ ret = gen_lowpart (GET_MODE (target), ret);
- /* Check the mangling, keeping in mind that operator new takes
- a size_t which could be unsigned int or unsigned long. */
- tree fname = DECL_ASSEMBLER_NAME (fn);
- if (!id_equal (fname, "_ZnwjPv") // ordinary form
- && !id_equal (fname, "_ZnwmPv") // ordinary form
- && !id_equal (fname, "_ZnajPv") // array form
- && !id_equal (fname, "_ZnamPv")) // array form
- return NULL_TREE;
+ ret = plus_constant (GET_MODE (ret), ret, INTVAL (len_rtx));
+ ret = emit_move_insn (target, force_operand (ret, NULL_RTX));
+ gcc_assert (ret);
- if (gimple_call_num_args (stmt) != 2)
- return NULL_TREE;
+ return target;
+ }
+ }
+ }
- /* Allocation functions return a pointer to the beginning. */
- offrng[0] = offrng[1] = 0;
- return gimple_call_arg (stmt, 1);
+ return expand_movstr (dst, src, target,
+ /*retmode=*/ RETURN_END_MINUS_ONE);
}
+}
- switch (DECL_FUNCTION_CODE (fn))
- {
- case BUILT_IN_MEMCPY:
- case BUILT_IN_MEMCPY_CHK:
- case BUILT_IN_MEMMOVE:
- case BUILT_IN_MEMMOVE_CHK:
- case BUILT_IN_MEMSET:
- case BUILT_IN_STRCAT:
- case BUILT_IN_STRCAT_CHK:
- case BUILT_IN_STRCPY:
- case BUILT_IN_STRCPY_CHK:
- case BUILT_IN_STRNCAT:
- case BUILT_IN_STRNCAT_CHK:
- case BUILT_IN_STRNCPY:
- case BUILT_IN_STRNCPY_CHK:
- /* Functions return the first argument (not a range). */
- offrng[0] = offrng[1] = 0;
- return gimple_call_arg (stmt, 0);
+/* Expand a call EXP to the stpcpy builtin and diagnose uses of nonstring
+ arguments while being careful to avoid duplicate warnings (which could
+ be issued if the expander were to expand the call, resulting in it
+ being emitted in expand_call(). */
- case BUILT_IN_MEMPCPY:
- case BUILT_IN_MEMPCPY_CHK:
- {
- /* The returned pointer is in a range constrained by the smaller
- of the upper bound of the size argument and the source object
- size. */
- offrng[0] = 0;
- offrng[1] = HOST_WIDE_INT_M1U;
- tree off = gimple_call_arg (stmt, 2);
- bool off_valid = get_offset_range (off, stmt, offrng, rvals);
- if (!off_valid || offrng[0] != offrng[1])
- {
- /* If the offset is either indeterminate or in some range,
- try to constrain its upper bound to at most the size
- of the source object. */
- access_ref aref;
- tree src = gimple_call_arg (stmt, 1);
- if (compute_objsize (src, 1, &aref, rvals)
- && aref.sizrng[1] < offrng[1])
- offrng[1] = aref.sizrng[1];
- }
+static rtx
+expand_builtin_stpcpy (tree exp, rtx target, machine_mode mode)
+{
+ if (rtx ret = expand_builtin_stpcpy_1 (exp, target, mode))
+ {
+ /* The call has been successfully expanded. Check for nonstring
+ arguments and issue warnings as appropriate. */
+ maybe_warn_nonstring_arg (get_callee_fndecl (exp), exp);
+ return ret;
+ }
- /* Mempcpy may return a past-the-end pointer. */
- *past_end = true;
- return gimple_call_arg (stmt, 0);
- }
+ return NULL_RTX;
+}
- case BUILT_IN_MEMCHR:
- {
- tree off = gimple_call_arg (stmt, 2);
- if (get_offset_range (off, stmt, offrng, rvals))
- offrng[1] -= 1;
- else
- offrng[1] = HOST_WIDE_INT_M1U;
+/* Check a call EXP to the stpncpy built-in for validity.
+ Return NULL_RTX on both success and failure. */
- offrng[0] = 0;
- return gimple_call_arg (stmt, 0);
- }
+static rtx
+expand_builtin_stpncpy (tree exp, rtx)
+{
+ if (!validate_arglist (exp,
+ POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
+ || !warn_stringop_overflow)
+ return NULL_RTX;
- case BUILT_IN_STRCHR:
- case BUILT_IN_STRRCHR:
- case BUILT_IN_STRSTR:
- offrng[0] = 0;
- offrng[1] = HOST_WIDE_INT_M1U;
- return gimple_call_arg (stmt, 0);
+ /* The source and destination of the call. */
+ tree dest = CALL_EXPR_ARG (exp, 0);
+ tree src = CALL_EXPR_ARG (exp, 1);
- case BUILT_IN_STPCPY:
- case BUILT_IN_STPCPY_CHK:
- {
- access_ref aref;
- tree src = gimple_call_arg (stmt, 1);
- if (compute_objsize (src, 1, &aref, rvals))
- offrng[1] = aref.sizrng[1] - 1;
- else
- offrng[1] = HOST_WIDE_INT_M1U;
-
- offrng[0] = 0;
- return gimple_call_arg (stmt, 0);
- }
+ /* The exact number of bytes to write (not the maximum). */
+ tree len = CALL_EXPR_ARG (exp, 2);
+ access_data data (exp, access_read_write);
+ /* The size of the destination object. */
+ tree destsize = compute_objsize (dest, warn_stringop_overflow - 1, &data.dst);
+ check_access (exp, len, /*maxread=*/len, src, destsize, data.mode, &data);
+ return NULL_RTX;
+}
- case BUILT_IN_STPNCPY:
- case BUILT_IN_STPNCPY_CHK:
- {
- /* The returned pointer is in a range between the first argument
- and it plus the smaller of the upper bound of the size argument
- and the source object size. */
- offrng[1] = HOST_WIDE_INT_M1U;
- tree off = gimple_call_arg (stmt, 2);
- if (!get_offset_range (off, stmt, offrng, rvals)
- || offrng[0] != offrng[1])
- {
- /* If the offset is either indeterminate or in some range,
- try to constrain its upper bound to at most the size
- of the source object. */
- access_ref aref;
- tree src = gimple_call_arg (stmt, 1);
- if (compute_objsize (src, 1, &aref, rvals)
- && aref.sizrng[1] < offrng[1])
- offrng[1] = aref.sizrng[1];
- }
+/* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
+ bytes from constant string DATA + OFFSET and return it as target
+ constant. */
- /* When the source is the empty string the returned pointer is
- a copy of the argument. Otherwise stpcpy can also return
- a past-the-end pointer. */
- offrng[0] = 0;
- *past_end = true;
- return gimple_call_arg (stmt, 0);
- }
+rtx
+builtin_strncpy_read_str (void *data, void *, HOST_WIDE_INT offset,
+ scalar_int_mode mode)
+{
+ const char *str = (const char *) data;
- default:
- break;
- }
+ if ((unsigned HOST_WIDE_INT) offset > strlen (str))
+ return const0_rtx;
- return NULL_TREE;
+ return c_readstr (str + offset, mode);
}
-/* A helper of compute_objsize_r() to determine the size from an assignment
- statement STMT with the RHS of either MIN_EXPR or MAX_EXPR. */
+/* Helper to check the sizes of sequences and the destination of calls
+ to __builtin_strncat and __builtin___strncat_chk. Returns true on
+ success (no overflow or invalid sizes), false otherwise. */
static bool
-handle_min_max_size (gimple *stmt, int ostype, access_ref *pref,
- ssa_name_limit_t &snlim, pointer_query *qry)
+check_strncat_sizes (tree exp, tree objsize)
{
- tree_code code = gimple_assign_rhs_code (stmt);
+ tree dest = CALL_EXPR_ARG (exp, 0);
+ tree src = CALL_EXPR_ARG (exp, 1);
+ tree maxread = CALL_EXPR_ARG (exp, 2);
- tree ptr = gimple_assign_rhs1 (stmt);
+ /* Try to determine the range of lengths that the source expression
+ refers to. */
+ c_strlen_data lendata = { };
+ get_range_strlen (src, &lendata, /* eltsize = */ 1);
- /* In a valid MAX_/MIN_EXPR both operands must refer to the same array.
- Determine the size/offset of each and use the one with more or less
- space remaining, respectively. If either fails, use the information
- determined from the other instead, adjusted up or down as appropriate
- for the expression. */
- access_ref aref[2] = { *pref, *pref };
- if (!compute_objsize_r (ptr, ostype, &aref[0], snlim, qry))
- {
- aref[0].base0 = false;
- aref[0].offrng[0] = aref[0].offrng[1] = 0;
- aref[0].add_max_offset ();
- aref[0].set_max_size_range ();
- }
+ /* Try to verify that the destination is big enough for the shortest
+ string. */
- ptr = gimple_assign_rhs2 (stmt);
- if (!compute_objsize_r (ptr, ostype, &aref[1], snlim, qry))
+ access_data data (exp, access_read_write, maxread, true);
+ if (!objsize && warn_stringop_overflow)
{
- aref[1].base0 = false;
- aref[1].offrng[0] = aref[1].offrng[1] = 0;
- aref[1].add_max_offset ();
- aref[1].set_max_size_range ();
+ /* If it hasn't been provided by __strncat_chk, try to determine
+ the size of the destination object into which the source is
+ being copied. */
+ objsize = compute_objsize (dest, warn_stringop_overflow - 1, &data.dst);
}
- if (!aref[0].ref && !aref[1].ref)
- /* Fail if the identity of neither argument could be determined. */
- return false;
+ /* Add one for the terminating nul. */
+ tree srclen = (lendata.minlen
+ ? fold_build2 (PLUS_EXPR, size_type_node, lendata.minlen,
+ size_one_node)
+ : NULL_TREE);
- bool i0 = false;
- if (aref[0].ref && aref[0].base0)
+ /* The strncat function copies at most MAXREAD bytes and always appends
+ the terminating nul so the specified upper bound should never be equal
+ to (or greater than) the size of the destination. */
+ if (tree_fits_uhwi_p (maxread) && tree_fits_uhwi_p (objsize)
+ && tree_int_cst_equal (objsize, maxread))
{
- if (aref[1].ref && aref[1].base0)
- {
- /* If the object referenced by both arguments has been determined
- set *PREF to the one with more or less space remainng, whichever
- is appopriate for CODE.
- TODO: Indicate when the objects are distinct so it can be
- diagnosed. */
- i0 = code == MAX_EXPR;
- const bool i1 = !i0;
-
- if (aref[i0].size_remaining () < aref[i1].size_remaining ())
- *pref = aref[i1];
- else
- *pref = aref[i0];
- return true;
- }
+ location_t loc = EXPR_LOCATION (exp);
+ warning_at (loc, OPT_Wstringop_overflow_,
+ "%qD specified bound %E equals destination size",
+ get_callee_fndecl (exp), maxread);
- /* If only the object referenced by one of the arguments could be
- determined, use it and... */
- *pref = aref[0];
- i0 = true;
+ return false;
}
- else
- *pref = aref[1];
- const bool i1 = !i0;
- /* ...see if the offset obtained from the other pointer can be used
- to tighten up the bound on the offset obtained from the first. */
- if ((code == MAX_EXPR && aref[i1].offrng[1] < aref[i0].offrng[0])
- || (code == MIN_EXPR && aref[i0].offrng[0] < aref[i1].offrng[1]))
- {
- pref->offrng[0] = aref[i0].offrng[0];
- pref->offrng[1] = aref[i0].offrng[1];
- }
- return true;
+ if (!srclen
+ || (maxread && tree_fits_uhwi_p (maxread)
+ && tree_fits_uhwi_p (srclen)
+ && tree_int_cst_lt (maxread, srclen)))
+ srclen = maxread;
+
+ /* The number of bytes to write is LEN but check_access will alsoa
+ check SRCLEN if LEN's value isn't known. */
+ return check_access (exp, /*dstwrite=*/NULL_TREE, maxread, srclen,
+ objsize, data.mode, &data);
}
-/* A helper of compute_objsize_r() to determine the size from ARRAY_REF
- AREF. ADDR is true if PTR is the operand of ADDR_EXPR. Return true
- on success and false on failure. */
+/* Similar to expand_builtin_strcat, do some very basic size validation
+ of a call to the strcpy builtin given by EXP. Return NULL_RTX to have
+ the built-in expand to a call to the library function. */
-static bool
-handle_array_ref (tree aref, bool addr, int ostype, access_ref *pref,
- ssa_name_limit_t &snlim, pointer_query *qry)
+static rtx
+expand_builtin_strncat (tree exp, rtx)
{
- gcc_assert (TREE_CODE (aref) == ARRAY_REF);
+ if (!validate_arglist (exp,
+ POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
+ || !warn_stringop_overflow)
+ return NULL_RTX;
- ++pref->deref;
+ tree dest = CALL_EXPR_ARG (exp, 0);
+ tree src = CALL_EXPR_ARG (exp, 1);
+ /* The upper bound on the number of bytes to write. */
+ tree maxread = CALL_EXPR_ARG (exp, 2);
- tree arefop = TREE_OPERAND (aref, 0);
- tree reftype = TREE_TYPE (arefop);
- if (!addr && TREE_CODE (TREE_TYPE (reftype)) == POINTER_TYPE)
- /* Avoid arrays of pointers. FIXME: Hande pointers to arrays
- of known bound. */
- return false;
+ /* Detect unterminated source (only). */
+ if (!check_nul_terminated_array (exp, src, maxread))
+ return NULL_RTX;
- if (!compute_objsize_r (arefop, ostype, pref, snlim, qry))
- return false;
+ /* The length of the source sequence. */
+ tree slen = c_strlen (src, 1);
- offset_int orng[2];
- tree off = pref->eval (TREE_OPERAND (aref, 1));
- range_query *const rvals = qry ? qry->rvals : NULL;
- if (!get_offset_range (off, NULL, orng, rvals))
+ /* Try to determine the range of lengths that the source expression
+ refers to. Since the lengths are only used for warning and not
+ for code generation disable strict mode below. */
+ tree maxlen = slen;
+ if (!maxlen)
{
- /* Set ORNG to the maximum offset representable in ptrdiff_t. */
- orng[1] = wi::to_offset (TYPE_MAX_VALUE (ptrdiff_type_node));
- orng[0] = -orng[1] - 1;
+ c_strlen_data lendata = { };
+ get_range_strlen (src, &lendata, /* eltsize = */ 1);
+ maxlen = lendata.maxbound;
}
- /* Convert the array index range determined above to a byte
- offset. */
- tree lowbnd = array_ref_low_bound (aref);
- if (!integer_zerop (lowbnd) && tree_fits_uhwi_p (lowbnd))
- {
- /* Adjust the index by the low bound of the array domain
- (normally zero but 1 in Fortran). */
- unsigned HOST_WIDE_INT lb = tree_to_uhwi (lowbnd);
- orng[0] -= lb;
- orng[1] -= lb;
- }
+ access_data data (exp, access_read_write);
+ /* Try to verify that the destination is big enough for the shortest
+ string. First try to determine the size of the destination object
+ into which the source is being copied. */
+ tree destsize = compute_objsize (dest, warn_stringop_overflow - 1, &data.dst);
+
+ /* Add one for the terminating nul. */
+ tree srclen = (maxlen
+ ? fold_build2 (PLUS_EXPR, size_type_node, maxlen,
+ size_one_node)
+ : NULL_TREE);
- tree eltype = TREE_TYPE (aref);
- tree tpsize = TYPE_SIZE_UNIT (eltype);
- if (!tpsize || TREE_CODE (tpsize) != INTEGER_CST)
+ /* The strncat function copies at most MAXREAD bytes and always appends
+ the terminating nul so the specified upper bound should never be equal
+ to (or greater than) the size of the destination. */
+ if (tree_fits_uhwi_p (maxread) && tree_fits_uhwi_p (destsize)
+ && tree_int_cst_equal (destsize, maxread))
{
- pref->add_max_offset ();
- return true;
+ location_t loc = EXPR_LOCATION (exp);
+ warning_at (loc, OPT_Wstringop_overflow_,
+ "%qD specified bound %E equals destination size",
+ get_callee_fndecl (exp), maxread);
+
+ return NULL_RTX;
}
- offset_int sz = wi::to_offset (tpsize);
- orng[0] *= sz;
- orng[1] *= sz;
+ if (!srclen
+ || (maxread && tree_fits_uhwi_p (maxread)
+ && tree_fits_uhwi_p (srclen)
+ && tree_int_cst_lt (maxread, srclen)))
+ srclen = maxread;
- if (ostype && TREE_CODE (eltype) == ARRAY_TYPE)
- {
- /* Except for the permissive raw memory functions which use
- the size of the whole object determined above, use the size
- of the referenced array. Because the overall offset is from
- the beginning of the complete array object add this overall
- offset to the size of array. */
- offset_int sizrng[2] =
- {
- pref->offrng[0] + orng[0] + sz,
- pref->offrng[1] + orng[1] + sz
- };
- if (sizrng[1] < sizrng[0])
- std::swap (sizrng[0], sizrng[1]);
- if (sizrng[0] >= 0 && sizrng[0] <= pref->sizrng[0])
- pref->sizrng[0] = sizrng[0];
- if (sizrng[1] >= 0 && sizrng[1] <= pref->sizrng[1])
- pref->sizrng[1] = sizrng[1];
- }
-
- pref->add_offset (orng[0], orng[1]);
- return true;
+ check_access (exp, /*dstwrite=*/NULL_TREE, maxread, srclen,
+ destsize, data.mode, &data);
+ return NULL_RTX;
}
-/* A helper of compute_objsize_r() to determine the size from MEM_REF
- MREF. Return true on success and false on failure. */
+/* Expand expression EXP, which is a call to the strncpy builtin. Return
+ NULL_RTX if we failed the caller should emit a normal call. */
-static bool
-handle_mem_ref (tree mref, int ostype, access_ref *pref,
- ssa_name_limit_t &snlim, pointer_query *qry)
+static rtx
+expand_builtin_strncpy (tree exp, rtx target)
{
- gcc_assert (TREE_CODE (mref) == MEM_REF);
+ location_t loc = EXPR_LOCATION (exp);
+
+ if (!validate_arglist (exp,
+ POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ return NULL_RTX;
+ tree dest = CALL_EXPR_ARG (exp, 0);
+ tree src = CALL_EXPR_ARG (exp, 1);
+ /* The number of bytes to write (not the maximum). */
+ tree len = CALL_EXPR_ARG (exp, 2);
- ++pref->deref;
+ /* The length of the source sequence. */
+ tree slen = c_strlen (src, 1);
- if (VECTOR_TYPE_P (TREE_TYPE (mref)))
+ if (warn_stringop_overflow)
{
- /* Hack: Handle MEM_REFs of vector types as those to complete
- objects; those may be synthesized from multiple assignments
- to consecutive data members (see PR 93200 and 96963).
- FIXME: Vectorized assignments should only be present after
- vectorization so this hack is only necessary after it has
- run and could be avoided in calls from prior passes (e.g.,
- tree-ssa-strlen.c).
- FIXME: Deal with this more generally, e.g., by marking up
- such MEM_REFs at the time they're created. */
- ostype = 0;
+ access_data data (exp, access_read_write, len, true, len, true);
+ const int ost = warn_stringop_overflow ? warn_stringop_overflow - 1 : 1;
+ compute_objsize (src, ost, &data.src);
+ tree dstsize = compute_objsize (dest, ost, &data.dst);
+ /* The number of bytes to write is LEN but check_access will also
+ check SLEN if LEN's value isn't known. */
+ check_access (exp, /*dstwrite=*/len,
+ /*maxread=*/len, src, dstsize, data.mode, &data);
}
- tree mrefop = TREE_OPERAND (mref, 0);
- if (!compute_objsize_r (mrefop, ostype, pref, snlim, qry))
- return false;
+ /* We must be passed a constant len and src parameter. */
+ if (!tree_fits_uhwi_p (len) || !slen || !tree_fits_uhwi_p (slen))
+ return NULL_RTX;
- offset_int orng[2];
- tree off = pref->eval (TREE_OPERAND (mref, 1));
- range_query *const rvals = qry ? qry->rvals : NULL;
- if (!get_offset_range (off, NULL, orng, rvals))
+ slen = size_binop_loc (loc, PLUS_EXPR, slen, ssize_int (1));
+
+ /* We're required to pad with trailing zeros if the requested
+ len is greater than strlen(s2)+1. In that case try to
+ use store_by_pieces, if it fails, punt. */
+ if (tree_int_cst_lt (slen, len))
{
- /* Set ORNG to the maximum offset representable in ptrdiff_t. */
- orng[1] = wi::to_offset (TYPE_MAX_VALUE (ptrdiff_type_node));
- orng[0] = -orng[1] - 1;
+ unsigned int dest_align = get_pointer_alignment (dest);
+ const char *p = c_getstr (src);
+ rtx dest_mem;
+
+ if (!p || dest_align == 0 || !tree_fits_uhwi_p (len)
+ || !can_store_by_pieces (tree_to_uhwi (len),
+ builtin_strncpy_read_str,
+ CONST_CAST (char *, p),
+ dest_align, false))
+ return NULL_RTX;
+
+ dest_mem = get_memory_rtx (dest, len);
+ store_by_pieces (dest_mem, tree_to_uhwi (len),
+ builtin_strncpy_read_str,
+ CONST_CAST (char *, p), dest_align, false,
+ RETURN_BEGIN);
+ dest_mem = force_operand (XEXP (dest_mem, 0), target);
+ dest_mem = convert_memory_address (ptr_mode, dest_mem);
+ return dest_mem;
}
- pref->add_offset (orng[0], orng[1]);
- return true;
+ return NULL_RTX;
}
-/* Helper to compute the size of the object referenced by the PTR
- expression which must have pointer type, using Object Size type
- OSTYPE (only the least significant 2 bits are used).
- On success, sets PREF->REF to the DECL of the referenced object
- if it's unique, otherwise to null, PREF->OFFRNG to the range of
- offsets into it, and PREF->SIZRNG to the range of sizes of
- the object(s).
- SNLIM is used to avoid visiting the same PHI operand multiple
- times, and, when nonnull, RVALS to determine range information.
- Returns true on success, false when a meaningful size (or range)
- cannot be determined.
-
- The function is intended for diagnostics and should not be used
- to influence code generation or optimization. */
+/* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
+ bytes from constant string DATA + OFFSET and return it as target
+ constant. If PREV isn't nullptr, it has the RTL info from the
+ previous iteration. */
-static bool
-compute_objsize_r (tree ptr, int ostype, access_ref *pref,
- ssa_name_limit_t &snlim, pointer_query *qry)
+rtx
+builtin_memset_read_str (void *data, void *prevp,
+ HOST_WIDE_INT offset ATTRIBUTE_UNUSED,
+ scalar_int_mode mode)
{
- STRIP_NOPS (ptr);
-
- const bool addr = TREE_CODE (ptr) == ADDR_EXPR;
- if (addr)
+ by_pieces_prev *prev = (by_pieces_prev *) prevp;
+ if (prev != nullptr && prev->data != nullptr)
{
- --pref->deref;
- ptr = TREE_OPERAND (ptr, 0);
+ /* Use the previous data in the same mode. */
+ if (prev->mode == mode)
+ return prev->data;
}
- if (DECL_P (ptr))
- {
- pref->ref = ptr;
+ const char *c = (const char *) data;
+ char *p = XALLOCAVEC (char, GET_MODE_SIZE (mode));
- if (!addr && POINTER_TYPE_P (TREE_TYPE (ptr)))
- {
- /* Set the maximum size if the reference is to the pointer
- itself (as opposed to what it points to), and clear
- BASE0 since the offset isn't necessarily zero-based. */
- pref->set_max_size_range ();
- pref->base0 = false;
- return true;
- }
+ memset (p, *c, GET_MODE_SIZE (mode));
- if (tree size = decl_init_size (ptr, false))
- if (TREE_CODE (size) == INTEGER_CST)
- {
- pref->sizrng[0] = pref->sizrng[1] = wi::to_offset (size);
- return true;
- }
+ return c_readstr (p, mode);
+}
- pref->set_max_size_range ();
- return true;
- }
+/* Callback routine for store_by_pieces. Return the RTL of a register
+ containing GET_MODE_SIZE (MODE) consecutive copies of the unsigned
+ char value given in the RTL register data. For example, if mode is
+ 4 bytes wide, return the RTL for 0x01010101*data. If PREV isn't
+ nullptr, it has the RTL info from the previous iteration. */
- const tree_code code = TREE_CODE (ptr);
- range_query *const rvals = qry ? qry->rvals : NULL;
+static rtx
+builtin_memset_gen_str (void *data, void *prevp,
+ HOST_WIDE_INT offset ATTRIBUTE_UNUSED,
+ scalar_int_mode mode)
+{
+ rtx target, coeff;
+ size_t size;
+ char *p;
- if (code == BIT_FIELD_REF)
+ by_pieces_prev *prev = (by_pieces_prev *) prevp;
+ if (prev != nullptr && prev->data != nullptr)
{
- tree ref = TREE_OPERAND (ptr, 0);
- if (!compute_objsize_r (ref, ostype, pref, snlim, qry))
- return false;
+ /* Use the previous data in the same mode. */
+ if (prev->mode == mode)
+ return prev->data;
- offset_int off = wi::to_offset (pref->eval (TREE_OPERAND (ptr, 2)));
- pref->add_offset (off / BITS_PER_UNIT);
- return true;
+ target = simplify_gen_subreg (mode, prev->data, prev->mode, 0);
+ if (target != nullptr)
+ return target;
}
- if (code == COMPONENT_REF)
- {
- tree ref = TREE_OPERAND (ptr, 0);
- if (TREE_CODE (TREE_TYPE (ref)) == UNION_TYPE)
- /* In accesses through union types consider the entire unions
- rather than just their members. */
- ostype = 0;
- tree field = TREE_OPERAND (ptr, 1);
+ size = GET_MODE_SIZE (mode);
+ if (size == 1)
+ return (rtx) data;
- if (ostype == 0)
- {
- /* In OSTYPE zero (for raw memory functions like memcpy), use
- the maximum size instead if the identity of the enclosing
- object cannot be determined. */
- if (!compute_objsize_r (ref, ostype, pref, snlim, qry))
- return false;
-
- /* Otherwise, use the size of the enclosing object and add
- the offset of the member to the offset computed so far. */
- tree offset = byte_position (field);
- if (TREE_CODE (offset) == INTEGER_CST)
- pref->add_offset (wi::to_offset (offset));
- else
- pref->add_max_offset ();
-
- if (!pref->ref)
- /* REF may have been already set to an SSA_NAME earlier
- to provide better context for diagnostics. In that case,
- leave it unchanged. */
- pref->ref = ref;
- return true;
- }
+ p = XALLOCAVEC (char, size);
+ memset (p, 1, size);
+ coeff = c_readstr (p, mode);
- pref->ref = field;
+ target = convert_to_mode (mode, (rtx) data, 1);
+ target = expand_mult (mode, target, coeff, NULL_RTX, 1);
+ return force_reg (mode, target);
+}
- if (!addr && POINTER_TYPE_P (TREE_TYPE (field)))
- {
- /* Set maximum size if the reference is to the pointer member
- itself (as opposed to what it points to). */
- pref->set_max_size_range ();
- return true;
- }
+/* Expand expression EXP, which is a call to the memset builtin. Return
+ NULL_RTX if we failed the caller should emit a normal call, otherwise
+ try to get the result in TARGET, if convenient (and in mode MODE if that's
+ convenient). */
- /* SAM is set for array members that might need special treatment. */
- special_array_member sam;
- tree size = component_ref_size (ptr, &sam);
- if (sam == special_array_member::int_0)
- pref->sizrng[0] = pref->sizrng[1] = 0;
- else if (!pref->trail1special && sam == special_array_member::trail_1)
- pref->sizrng[0] = pref->sizrng[1] = 1;
- else if (size && TREE_CODE (size) == INTEGER_CST)
- pref->sizrng[0] = pref->sizrng[1] = wi::to_offset (size);
- else
- {
- /* When the size of the member is unknown it's either a flexible
- array member or a trailing special array member (either zero
- length or one-element). Set the size to the maximum minus
- the constant size of the type. */
- pref->sizrng[0] = 0;
- pref->sizrng[1] = wi::to_offset (TYPE_MAX_VALUE (ptrdiff_type_node));
- if (tree recsize = TYPE_SIZE_UNIT (TREE_TYPE (ref)))
- if (TREE_CODE (recsize) == INTEGER_CST)
- pref->sizrng[1] -= wi::to_offset (recsize);
- }
- return true;
- }
+static rtx
+expand_builtin_memset (tree exp, rtx target, machine_mode mode)
+{
+ if (!validate_arglist (exp,
+ POINTER_TYPE, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ return NULL_RTX;
- if (code == ARRAY_REF)
- return handle_array_ref (ptr, addr, ostype, pref, snlim, qry);
+ tree dest = CALL_EXPR_ARG (exp, 0);
+ tree val = CALL_EXPR_ARG (exp, 1);
+ tree len = CALL_EXPR_ARG (exp, 2);
- if (code == MEM_REF)
- return handle_mem_ref (ptr, ostype, pref, snlim, qry);
+ check_memop_access (exp, dest, NULL_TREE, len);
- if (code == TARGET_MEM_REF)
- {
- tree ref = TREE_OPERAND (ptr, 0);
- if (!compute_objsize_r (ref, ostype, pref, snlim, qry))
- return false;
+ return expand_builtin_memset_args (dest, val, len, target, mode, exp);
+}
- /* TODO: Handle remaining operands. Until then, add maximum offset. */
- pref->ref = ptr;
- pref->add_max_offset ();
- return true;
- }
+/* Try to store VAL (or, if NULL_RTX, VALC) in LEN bytes starting at TO.
+ Return TRUE if successful, FALSE otherwise. TO is assumed to be
+ aligned at an ALIGN-bits boundary. LEN must be a multiple of
+ 1<<CTZ_LEN between MIN_LEN and MAX_LEN.
- if (code == INTEGER_CST)
- {
- /* Pointer constants other than null are most likely the result
- of erroneous null pointer addition/subtraction. Set size to
- zero. For null pointers, set size to the maximum for now
- since those may be the result of jump threading. */
- if (integer_zerop (ptr))
- pref->set_max_size_range ();
- else
- pref->sizrng[0] = pref->sizrng[1] = 0;
- pref->ref = ptr;
+ The strategy is to issue one store_by_pieces for each power of two,
+ from most to least significant, guarded by a test on whether there
+ are at least that many bytes left to copy in LEN.
- return true;
- }
+ ??? Should we skip some powers of two in favor of loops? Maybe start
+ at the max of TO/LEN/word alignment, at least when optimizing for
+ size, instead of ensuring O(log len) dynamic compares? */
- if (code == STRING_CST)
- {
- pref->sizrng[0] = pref->sizrng[1] = TREE_STRING_LENGTH (ptr);
- pref->ref = ptr;
- return true;
- }
+bool
+try_store_by_multiple_pieces (rtx to, rtx len, unsigned int ctz_len,
+ unsigned HOST_WIDE_INT min_len,
+ unsigned HOST_WIDE_INT max_len,
+ rtx val, char valc, unsigned int align)
+{
+ int max_bits = floor_log2 (max_len);
+ int min_bits = floor_log2 (min_len);
+ int sctz_len = ctz_len;
- if (code == POINTER_PLUS_EXPR)
- {
- tree ref = TREE_OPERAND (ptr, 0);
- if (!compute_objsize_r (ref, ostype, pref, snlim, qry))
- return false;
+ gcc_checking_assert (sctz_len >= 0);
- /* Clear DEREF since the offset is being applied to the target
- of the dereference. */
- pref->deref = 0;
+ if (val)
+ valc = 1;
- offset_int orng[2];
- tree off = pref->eval (TREE_OPERAND (ptr, 1));
- if (get_offset_range (off, NULL, orng, rvals))
- pref->add_offset (orng[0], orng[1]);
- else
- pref->add_max_offset ();
- return true;
- }
+ /* Bits more significant than TST_BITS are part of the shared prefix
+ in the binary representation of both min_len and max_len. Since
+ they're identical, we don't need to test them in the loop. */
+ int tst_bits = (max_bits != min_bits ? max_bits
+ : floor_log2 (max_len ^ min_len));
- if (code == VIEW_CONVERT_EXPR)
+ /* Check whether it's profitable to start by storing a fixed BLKSIZE
+ bytes, to lower max_bits. In the unlikely case of a constant LEN
+ (implied by identical MAX_LEN and MIN_LEN), we want to issue a
+ single store_by_pieces, but otherwise, select the minimum multiple
+ of the ALIGN (in bytes) and of the MCD of the possible LENs, that
+ brings MAX_LEN below TST_BITS, if that's lower than min_len. */
+ unsigned HOST_WIDE_INT blksize;
+ if (max_len > min_len)
{
- ptr = TREE_OPERAND (ptr, 0);
- return compute_objsize_r (ptr, ostype, pref, snlim, qry);
+ unsigned HOST_WIDE_INT alrng = MAX (HOST_WIDE_INT_1U << ctz_len,
+ align / BITS_PER_UNIT);
+ blksize = max_len - (HOST_WIDE_INT_1U << tst_bits) + alrng;
+ blksize &= ~(alrng - 1);
}
-
- if (code == SSA_NAME)
+ else if (max_len == min_len)
+ blksize = max_len;
+ else
+ gcc_unreachable ();
+ if (min_len >= blksize)
{
- if (!snlim.next ())
- return false;
+ min_len -= blksize;
+ min_bits = floor_log2 (min_len);
+ max_len -= blksize;
+ max_bits = floor_log2 (max_len);
- /* Only process an SSA_NAME if the recursion limit has not yet
- been reached. */
- if (qry)
- {
- if (++qry->depth)
- qry->max_depth = qry->depth;
- if (const access_ref *cache_ref = qry->get_ref (ptr))
- {
- /* If the pointer is in the cache set *PREF to what it refers
- to and return success. */
- *pref = *cache_ref;
- return true;
- }
- }
+ tst_bits = (max_bits != min_bits ? max_bits
+ : floor_log2 (max_len ^ min_len));
+ }
+ else
+ blksize = 0;
- gimple *stmt = SSA_NAME_DEF_STMT (ptr);
- if (is_gimple_call (stmt))
- {
- /* If STMT is a call to an allocation function get the size
- from its argument(s). If successful, also set *PREF->REF
- to PTR for the caller to include in diagnostics. */
- wide_int wr[2];
- if (gimple_call_alloc_size (stmt, wr, rvals))
- {
- pref->ref = ptr;
- pref->sizrng[0] = offset_int::from (wr[0], UNSIGNED);
- pref->sizrng[1] = offset_int::from (wr[1], UNSIGNED);
- /* Constrain both bounds to a valid size. */
- offset_int maxsize = wi::to_offset (max_object_size ());
- if (pref->sizrng[0] > maxsize)
- pref->sizrng[0] = maxsize;
- if (pref->sizrng[1] > maxsize)
- pref->sizrng[1] = maxsize;
- }
- else
- {
- /* For functions known to return one of their pointer arguments
- try to determine what the returned pointer points to, and on
- success add OFFRNG which was set to the offset added by
- the function (e.g., memchr or stpcpy) to the overall offset.
- */
- bool past_end;
- offset_int offrng[2];
- if (tree ret = gimple_call_return_array (stmt, offrng,
- &past_end, rvals))
- {
- if (!compute_objsize_r (ret, ostype, pref, snlim, qry))
- return false;
-
- /* Cap OFFRNG[1] to at most the remaining size of
- the object. */
- offset_int remrng[2];
- remrng[1] = pref->size_remaining (remrng);
- if (remrng[1] != 0 && !past_end)
- /* Decrement the size for functions that never return
- a past-the-end pointer. */
- remrng[1] -= 1;
-
- if (remrng[1] < offrng[1])
- offrng[1] = remrng[1];
- pref->add_offset (offrng[0], offrng[1]);
- }
- else
- {
- /* For other calls that might return arbitrary pointers
- including into the middle of objects set the size
- range to maximum, clear PREF->BASE0, and also set
- PREF->REF to include in diagnostics. */
- pref->set_max_size_range ();
- pref->base0 = false;
- pref->ref = ptr;
- }
- }
- qry->put_ref (ptr, *pref);
- return true;
- }
+ /* Check that we can use store by pieces for the maximum store count
+ we may issue (initial fixed-size block, plus conditional
+ power-of-two-sized from max_bits to ctz_len. */
+ unsigned HOST_WIDE_INT xlenest = blksize;
+ if (max_bits >= 0)
+ xlenest += ((HOST_WIDE_INT_1U << max_bits) * 2
+ - (HOST_WIDE_INT_1U << ctz_len));
+ if (!can_store_by_pieces (xlenest, builtin_memset_read_str,
+ &valc, align, true))
+ return false;
- if (gimple_nop_p (stmt))
- {
- /* For a function argument try to determine the byte size
- of the array from the current function declaratation
- (e.g., attribute access or related). */
- wide_int wr[2];
- bool static_array = false;
- if (tree ref = gimple_parm_array_size (ptr, wr, &static_array))
- {
- pref->parmarray = !static_array;
- pref->sizrng[0] = offset_int::from (wr[0], UNSIGNED);
- pref->sizrng[1] = offset_int::from (wr[1], UNSIGNED);
- pref->ref = ref;
- qry->put_ref (ptr, *pref);
- return true;
- }
+ rtx (*constfun) (void *, void *, HOST_WIDE_INT, scalar_int_mode);
+ void *constfundata;
+ if (val)
+ {
+ constfun = builtin_memset_gen_str;
+ constfundata = val = force_reg (TYPE_MODE (unsigned_char_type_node),
+ val);
+ }
+ else
+ {
+ constfun = builtin_memset_read_str;
+ constfundata = &valc;
+ }
- pref->set_max_size_range ();
- pref->base0 = false;
- pref->ref = ptr;
- qry->put_ref (ptr, *pref);
- return true;
- }
+ rtx ptr = copy_addr_to_reg (convert_to_mode (ptr_mode, XEXP (to, 0), 0));
+ rtx rem = copy_to_mode_reg (ptr_mode, convert_to_mode (ptr_mode, len, 0));
+ to = replace_equiv_address (to, ptr);
+ set_mem_align (to, align);
- if (gimple_code (stmt) == GIMPLE_PHI)
- {
- pref->ref = ptr;
- access_ref phi_ref = *pref;
- if (!pref->get_ref (NULL, &phi_ref, ostype, &snlim, qry))
- return false;
- *pref = phi_ref;
- pref->ref = ptr;
- qry->put_ref (ptr, *pref);
- return true;
- }
+ if (blksize)
+ {
+ to = store_by_pieces (to, blksize,
+ constfun, constfundata,
+ align, true,
+ max_len != 0 ? RETURN_END : RETURN_BEGIN);
+ if (max_len == 0)
+ return true;
- if (!is_gimple_assign (stmt))
- {
- /* Clear BASE0 since the assigned pointer might point into
- the middle of the object, set the maximum size range and,
- if the SSA_NAME refers to a function argumnent, set
- PREF->REF to it. */
- pref->base0 = false;
- pref->set_max_size_range ();
- pref->ref = ptr;
- return true;
- }
+ /* Adjust PTR, TO and REM. Since TO's address is likely
+ PTR+offset, we have to replace it. */
+ emit_move_insn (ptr, force_operand (XEXP (to, 0), NULL_RTX));
+ to = replace_equiv_address (to, ptr);
+ rtx rem_minus_blksize = plus_constant (ptr_mode, rem, -blksize);
+ emit_move_insn (rem, force_operand (rem_minus_blksize, NULL_RTX));
+ }
- tree_code code = gimple_assign_rhs_code (stmt);
+ /* Iterate over power-of-two block sizes from the maximum length to
+ the least significant bit possibly set in the length. */
+ for (int i = max_bits; i >= sctz_len; i--)
+ {
+ rtx_code_label *label = NULL;
+ blksize = HOST_WIDE_INT_1U << i;
- if (code == MAX_EXPR || code == MIN_EXPR)
+ /* If we're past the bits shared between min_ and max_len, expand
+ a test on the dynamic length, comparing it with the
+ BLKSIZE. */
+ if (i <= tst_bits)
{
- if (!handle_min_max_size (stmt, ostype, pref, snlim, qry))
- return false;
- qry->put_ref (ptr, *pref);
- return true;
+ label = gen_label_rtx ();
+ emit_cmp_and_jump_insns (rem, GEN_INT (blksize), LT, NULL,
+ ptr_mode, 1, label,
+ profile_probability::even ());
}
+ /* If we are at a bit that is in the prefix shared by min_ and
+ max_len, skip this BLKSIZE if the bit is clear. */
+ else if ((max_len & blksize) == 0)
+ continue;
- tree rhs = gimple_assign_rhs1 (stmt);
+ /* Issue a store of BLKSIZE bytes. */
+ to = store_by_pieces (to, blksize,
+ constfun, constfundata,
+ align, true,
+ i != sctz_len ? RETURN_END : RETURN_BEGIN);
- if (code == ASSERT_EXPR)
+ /* Adjust REM and PTR, unless this is the last iteration. */
+ if (i != sctz_len)
{
- rhs = TREE_OPERAND (rhs, 0);
- return compute_objsize_r (rhs, ostype, pref, snlim, qry);
+ emit_move_insn (ptr, force_operand (XEXP (to, 0), NULL_RTX));
+ to = replace_equiv_address (to, ptr);
+ rtx rem_minus_blksize = plus_constant (ptr_mode, rem, -blksize);
+ emit_move_insn (rem, force_operand (rem_minus_blksize, NULL_RTX));
}
- if (code == POINTER_PLUS_EXPR
- && TREE_CODE (TREE_TYPE (rhs)) == POINTER_TYPE)
+ if (label)
{
- /* Compute the size of the object first. */
- if (!compute_objsize_r (rhs, ostype, pref, snlim, qry))
- return false;
-
- offset_int orng[2];
- tree off = gimple_assign_rhs2 (stmt);
- if (get_offset_range (off, stmt, orng, rvals))
- pref->add_offset (orng[0], orng[1]);
- else
- pref->add_max_offset ();
- qry->put_ref (ptr, *pref);
- return true;
- }
-
- if (code == ADDR_EXPR
- || code == SSA_NAME)
- return compute_objsize_r (rhs, ostype, pref, snlim, qry);
+ emit_label (label);
- /* (This could also be an assignment from a nonlocal pointer.) Save
- PTR to mention in diagnostics but otherwise treat it as a pointer
- to an unknown object. */
- pref->ref = rhs;
- pref->base0 = false;
- pref->set_max_size_range ();
- return true;
+ /* Given conditional stores, the offset can no longer be
+ known, so clear it. */
+ clear_mem_offset (to);
+ }
}
- /* Assume all other expressions point into an unknown object
- of the maximum valid size. */
- pref->ref = ptr;
- pref->base0 = false;
- pref->set_max_size_range ();
- if (TREE_CODE (ptr) == SSA_NAME)
- qry->put_ref (ptr, *pref);
return true;
}
-/* A "public" wrapper around the above. Clients should use this overload
- instead. */
+/* Helper function to do the actual work for expand_builtin_memset. The
+ arguments to the builtin_memset call DEST, VAL, and LEN are broken out
+ so that this can also be called without constructing an actual CALL_EXPR.
+ The other arguments and return value are the same as for
+ expand_builtin_memset. */
-tree
-compute_objsize (tree ptr, int ostype, access_ref *pref,
- range_query *rvals /* = NULL */)
+static rtx
+expand_builtin_memset_args (tree dest, tree val, tree len,
+ rtx target, machine_mode mode, tree orig_exp)
{
- pointer_query qry;
- qry.rvals = rvals;
- ssa_name_limit_t snlim;
- if (!compute_objsize_r (ptr, ostype, pref, snlim, &qry))
- return NULL_TREE;
-
- offset_int maxsize = pref->size_remaining ();
- if (pref->base0 && pref->offrng[0] < 0 && pref->offrng[1] >= 0)
- pref->offrng[0] = 0;
- return wide_int_to_tree (sizetype, maxsize);
-}
+ tree fndecl, fn;
+ enum built_in_function fcode;
+ machine_mode val_mode;
+ char c;
+ unsigned int dest_align;
+ rtx dest_mem, dest_addr, len_rtx;
+ HOST_WIDE_INT expected_size = -1;
+ unsigned int expected_align = 0;
+ unsigned HOST_WIDE_INT min_size;
+ unsigned HOST_WIDE_INT max_size;
+ unsigned HOST_WIDE_INT probable_max_size;
-/* Transitional wrapper. The function should be removed once callers
- transition to the pointer_query API. */
+ dest_align = get_pointer_alignment (dest);
-tree
-compute_objsize (tree ptr, int ostype, access_ref *pref, pointer_query *ptr_qry)
-{
- pointer_query qry;
- if (ptr_qry)
- ptr_qry->depth = 0;
- else
- ptr_qry = &qry;
+ /* If DEST is not a pointer type, don't do this operation in-line. */
+ if (dest_align == 0)
+ return NULL_RTX;
- ssa_name_limit_t snlim;
- if (!compute_objsize_r (ptr, ostype, pref, snlim, ptr_qry))
- return NULL_TREE;
+ if (currently_expanding_gimple_stmt)
+ stringop_block_profile (currently_expanding_gimple_stmt,
+ &expected_align, &expected_size);
- offset_int maxsize = pref->size_remaining ();
- if (pref->base0 && pref->offrng[0] < 0 && pref->offrng[1] >= 0)
- pref->offrng[0] = 0;
- return wide_int_to_tree (sizetype, maxsize);
-}
+ if (expected_align < dest_align)
+ expected_align = dest_align;
-/* Legacy wrapper around the above. The function should be removed
- once callers transition to one of the two above. */
+ /* If the LEN parameter is zero, return DEST. */
+ if (integer_zerop (len))
+ {
+ /* Evaluate and ignore VAL in case it has side-effects. */
+ expand_expr (val, const0_rtx, VOIDmode, EXPAND_NORMAL);
+ return expand_expr (dest, target, mode, EXPAND_NORMAL);
+ }
-tree
-compute_objsize (tree ptr, int ostype, tree *pdecl /* = NULL */,
- tree *poff /* = NULL */, range_query *rvals /* = NULL */)
-{
- /* Set the initial offsets to zero and size to negative to indicate
- none has been computed yet. */
- access_ref ref;
- tree size = compute_objsize (ptr, ostype, &ref, rvals);
- if (!size || !ref.base0)
- return NULL_TREE;
+ /* Stabilize the arguments in case we fail. */
+ dest = builtin_save_expr (dest);
+ val = builtin_save_expr (val);
+ len = builtin_save_expr (len);
- if (pdecl)
- *pdecl = ref.ref;
+ len_rtx = expand_normal (len);
+ determine_block_size (len, len_rtx, &min_size, &max_size,
+ &probable_max_size);
+ dest_mem = get_memory_rtx (dest, len);
+ val_mode = TYPE_MODE (unsigned_char_type_node);
- if (poff)
- *poff = wide_int_to_tree (ptrdiff_type_node, ref.offrng[ref.offrng[0] < 0]);
+ if (TREE_CODE (val) != INTEGER_CST
+ || target_char_cast (val, &c))
+ {
+ rtx val_rtx;
- return size;
-}
+ val_rtx = expand_normal (val);
+ val_rtx = convert_to_mode (val_mode, val_rtx, 0);
-/* Helper to determine and check the sizes of the source and the destination
- of calls to __builtin_{bzero,memcpy,mempcpy,memset} calls. EXP is the
- call expression, DEST is the destination argument, SRC is the source
- argument or null, and LEN is the number of bytes. Use Object Size type-0
- regardless of the OPT_Wstringop_overflow_ setting. Return true on success
- (no overflow or invalid sizes), false otherwise. */
+ /* Assume that we can memset by pieces if we can store
+ * the coefficients by pieces (in the required modes).
+ * We can't pass builtin_memset_gen_str as that emits RTL. */
+ c = 1;
+ if (tree_fits_uhwi_p (len)
+ && can_store_by_pieces (tree_to_uhwi (len),
+ builtin_memset_read_str, &c, dest_align,
+ true))
+ {
+ val_rtx = force_reg (val_mode, val_rtx);
+ store_by_pieces (dest_mem, tree_to_uhwi (len),
+ builtin_memset_gen_str, val_rtx, dest_align,
+ true, RETURN_BEGIN);
+ }
+ else if (!set_storage_via_setmem (dest_mem, len_rtx, val_rtx,
+ dest_align, expected_align,
+ expected_size, min_size, max_size,
+ probable_max_size)
+ && !try_store_by_multiple_pieces (dest_mem, len_rtx,
+ tree_ctz (len),
+ min_size, max_size,
+ val_rtx, 0,
+ dest_align))
+ goto do_libcall;
-static bool
-check_memop_access (tree exp, tree dest, tree src, tree size)
-{
- /* For functions like memset and memcpy that operate on raw memory
- try to determine the size of the largest source and destination
- object using type-0 Object Size regardless of the object size
- type specified by the option. */
- access_data data (exp, access_read_write);
- tree srcsize = src ? compute_objsize (src, 0, &data.src) : NULL_TREE;
- tree dstsize = compute_objsize (dest, 0, &data.dst);
+ dest_mem = force_operand (XEXP (dest_mem, 0), NULL_RTX);
+ dest_mem = convert_memory_address (ptr_mode, dest_mem);
+ return dest_mem;
+ }
- return check_access (exp, size, /*maxread=*/NULL_TREE,
- srcsize, dstsize, data.mode, &data);
-}
+ if (c)
+ {
+ if (tree_fits_uhwi_p (len)
+ && can_store_by_pieces (tree_to_uhwi (len),
+ builtin_memset_read_str, &c, dest_align,
+ true))
+ store_by_pieces (dest_mem, tree_to_uhwi (len),
+ builtin_memset_read_str, &c, dest_align, true,
+ RETURN_BEGIN);
+ else if (!set_storage_via_setmem (dest_mem, len_rtx,
+ gen_int_mode (c, val_mode),
+ dest_align, expected_align,
+ expected_size, min_size, max_size,
+ probable_max_size)
+ && !try_store_by_multiple_pieces (dest_mem, len_rtx,
+ tree_ctz (len),
+ min_size, max_size,
+ NULL_RTX, c,
+ dest_align))
+ goto do_libcall;
-/* Validate memchr arguments without performing any expansion.
- Return NULL_RTX. */
+ dest_mem = force_operand (XEXP (dest_mem, 0), NULL_RTX);
+ dest_mem = convert_memory_address (ptr_mode, dest_mem);
+ return dest_mem;
+ }
-static rtx
-expand_builtin_memchr (tree exp, rtx)
-{
- if (!validate_arglist (exp,
- POINTER_TYPE, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
- return NULL_RTX;
+ set_mem_align (dest_mem, dest_align);
+ dest_addr = clear_storage_hints (dest_mem, len_rtx,
+ CALL_EXPR_TAILCALL (orig_exp)
+ ? BLOCK_OP_TAILCALL : BLOCK_OP_NORMAL,
+ expected_align, expected_size,
+ min_size, max_size,
+ probable_max_size, tree_ctz (len));
- tree arg1 = CALL_EXPR_ARG (exp, 0);
- tree len = CALL_EXPR_ARG (exp, 2);
+ if (dest_addr == 0)
+ {
+ dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
+ dest_addr = convert_memory_address (ptr_mode, dest_addr);
+ }
- check_read_access (exp, arg1, len, 0);
+ return dest_addr;
- return NULL_RTX;
+ do_libcall:
+ fndecl = get_callee_fndecl (orig_exp);
+ fcode = DECL_FUNCTION_CODE (fndecl);
+ if (fcode == BUILT_IN_MEMSET)
+ fn = build_call_nofold_loc (EXPR_LOCATION (orig_exp), fndecl, 3,
+ dest, val, len);
+ else if (fcode == BUILT_IN_BZERO)
+ fn = build_call_nofold_loc (EXPR_LOCATION (orig_exp), fndecl, 2,
+ dest, len);
+ else
+ gcc_unreachable ();
+ gcc_assert (TREE_CODE (fn) == CALL_EXPR);
+ CALL_EXPR_TAILCALL (fn) = CALL_EXPR_TAILCALL (orig_exp);
+ return expand_call (fn, target, target == const0_rtx);
}
-/* Expand a call EXP to the memcpy builtin.
- Return NULL_RTX if we failed, the caller should emit a normal call,
- otherwise try to get the result in TARGET, if convenient (and in
- mode MODE if that's convenient). */
+/* Expand expression EXP, which is a call to the bzero builtin. Return
+ NULL_RTX if we failed the caller should emit a normal call. */
static rtx
-expand_builtin_memcpy (tree exp, rtx target)
+expand_builtin_bzero (tree exp)
{
- if (!validate_arglist (exp,
- POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ if (!validate_arglist (exp, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
return NULL_RTX;
tree dest = CALL_EXPR_ARG (exp, 0);
- tree src = CALL_EXPR_ARG (exp, 1);
- tree len = CALL_EXPR_ARG (exp, 2);
+ tree size = CALL_EXPR_ARG (exp, 1);
- check_memop_access (exp, dest, src, len);
+ check_memop_access (exp, dest, NULL_TREE, size);
- return expand_builtin_memory_copy_args (dest, src, len, target, exp,
- /*retmode=*/ RETURN_BEGIN, false);
+ /* New argument list transforming bzero(ptr x, int y) to
+ memset(ptr x, int 0, size_t y). This is done this way
+ so that if it isn't expanded inline, we fallback to
+ calling bzero instead of memset. */
+
+ location_t loc = EXPR_LOCATION (exp);
+
+ return expand_builtin_memset_args (dest, integer_zero_node,
+ fold_convert_loc (loc,
+ size_type_node, size),
+ const0_rtx, VOIDmode, exp);
}
-/* Check a call EXP to the memmove built-in for validity.
- Return NULL_RTX on both success and failure. */
+/* Try to expand cmpstr operation ICODE with the given operands.
+ Return the result rtx on success, otherwise return null. */
static rtx
-expand_builtin_memmove (tree exp, rtx target)
+expand_cmpstr (insn_code icode, rtx target, rtx arg1_rtx, rtx arg2_rtx,
+ HOST_WIDE_INT align)
{
- if (!validate_arglist (exp,
- POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
- return NULL_RTX;
-
- tree dest = CALL_EXPR_ARG (exp, 0);
- tree src = CALL_EXPR_ARG (exp, 1);
- tree len = CALL_EXPR_ARG (exp, 2);
+ machine_mode insn_mode = insn_data[icode].operand[0].mode;
- check_memop_access (exp, dest, src, len);
+ if (target && (!REG_P (target) || HARD_REGISTER_P (target)))
+ target = NULL_RTX;
- return expand_builtin_memory_copy_args (dest, src, len, target, exp,
- /*retmode=*/ RETURN_BEGIN, true);
+ class expand_operand ops[4];
+ create_output_operand (&ops[0], target, insn_mode);
+ create_fixed_operand (&ops[1], arg1_rtx);
+ create_fixed_operand (&ops[2], arg2_rtx);
+ create_integer_operand (&ops[3], align);
+ if (maybe_expand_insn (icode, 4, ops))
+ return ops[0].value;
+ return NULL_RTX;
}
-/* Expand a call EXP to the mempcpy builtin.
- Return NULL_RTX if we failed; the caller should emit a normal call,
- otherwise try to get the result in TARGET, if convenient (and in
- mode MODE if that's convenient). */
+/* Expand expression EXP, which is a call to the memcmp built-in function.
+ Return NULL_RTX if we failed and the caller should emit a normal call,
+ otherwise try to get the result in TARGET, if convenient.
+ RESULT_EQ is true if we can relax the returned value to be either zero
+ or nonzero, without caring about the sign. */
static rtx
-expand_builtin_mempcpy (tree exp, rtx target)
+expand_builtin_memcmp (tree exp, rtx target, bool result_eq)
{
if (!validate_arglist (exp,
POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
return NULL_RTX;
- tree dest = CALL_EXPR_ARG (exp, 0);
- tree src = CALL_EXPR_ARG (exp, 1);
+ tree arg1 = CALL_EXPR_ARG (exp, 0);
+ tree arg2 = CALL_EXPR_ARG (exp, 1);
tree len = CALL_EXPR_ARG (exp, 2);
- /* Policy does not generally allow using compute_objsize (which
- is used internally by check_memop_size) to change code generation
- or drive optimization decisions.
-
- In this instance it is safe because the code we generate has
- the same semantics regardless of the return value of
- check_memop_sizes. Exactly the same amount of data is copied
- and the return value is exactly the same in both cases.
-
- Furthermore, check_memop_size always uses mode 0 for the call to
- compute_objsize, so the imprecise nature of compute_objsize is
- avoided. */
-
- /* Avoid expanding mempcpy into memcpy when the call is determined
- to overflow the buffer. This also prevents the same overflow
- from being diagnosed again when expanding memcpy. */
- if (!check_memop_access (exp, dest, src, len))
+ /* Diagnose calls where the specified length exceeds the size of either
+ object. */
+ if (!check_read_access (exp, arg1, len, 0)
+ || !check_read_access (exp, arg2, len, 0))
return NULL_RTX;
- return expand_builtin_mempcpy_args (dest, src, len,
- target, exp, /*retmode=*/ RETURN_END);
-}
-
-/* Helper function to do the actual work for expand of memory copy family
- functions (memcpy, mempcpy, stpcpy). Expansing should assign LEN bytes
- of memory from SRC to DEST and assign to TARGET if convenient. Return
- value is based on RETMODE argument. */
+ /* Due to the performance benefit, always inline the calls first
+ when result_eq is false. */
+ rtx result = NULL_RTX;
+ enum built_in_function fcode = DECL_FUNCTION_CODE (get_callee_fndecl (exp));
+ if (!result_eq && fcode != BUILT_IN_BCMP)
+ {
+ result = inline_expand_builtin_bytecmp (exp, target);
+ if (result)
+ return result;
+ }
-static rtx
-expand_builtin_memory_copy_args (tree dest, tree src, tree len,
- rtx target, tree exp, memop_ret retmode,
- bool might_overlap)
-{
- unsigned int src_align = get_pointer_alignment (src);
- unsigned int dest_align = get_pointer_alignment (dest);
- rtx dest_mem, src_mem, dest_addr, len_rtx;
- HOST_WIDE_INT expected_size = -1;
- unsigned int expected_align = 0;
- unsigned HOST_WIDE_INT min_size;
- unsigned HOST_WIDE_INT max_size;
- unsigned HOST_WIDE_INT probable_max_size;
+ machine_mode mode = TYPE_MODE (TREE_TYPE (exp));
+ location_t loc = EXPR_LOCATION (exp);
- bool is_move_done;
+ unsigned int arg1_align = get_pointer_alignment (arg1) / BITS_PER_UNIT;
+ unsigned int arg2_align = get_pointer_alignment (arg2) / BITS_PER_UNIT;
- /* If DEST is not a pointer type, call the normal function. */
- if (dest_align == 0)
+ /* If we don't have POINTER_TYPE, call the function. */
+ if (arg1_align == 0 || arg2_align == 0)
return NULL_RTX;
- /* If either SRC is not a pointer type, don't do this
- operation in-line. */
- if (src_align == 0)
- return NULL_RTX;
+ rtx arg1_rtx = get_memory_rtx (arg1, len);
+ rtx arg2_rtx = get_memory_rtx (arg2, len);
+ rtx len_rtx = expand_normal (fold_convert_loc (loc, sizetype, len));
- if (currently_expanding_gimple_stmt)
- stringop_block_profile (currently_expanding_gimple_stmt,
- &expected_align, &expected_size);
+ /* Set MEM_SIZE as appropriate. */
+ if (CONST_INT_P (len_rtx))
+ {
+ set_mem_size (arg1_rtx, INTVAL (len_rtx));
+ set_mem_size (arg2_rtx, INTVAL (len_rtx));
+ }
- if (expected_align < dest_align)
- expected_align = dest_align;
- dest_mem = get_memory_rtx (dest, len);
- set_mem_align (dest_mem, dest_align);
- len_rtx = expand_normal (len);
- determine_block_size (len, len_rtx, &min_size, &max_size,
- &probable_max_size);
+ by_pieces_constfn constfn = NULL;
- /* Try to get the byte representation of the constant SRC points to,
- with its byte size in NBYTES. */
+ /* Try to get the byte representation of the constant ARG2 (or, only
+ when the function's result is used for equality to zero, ARG1)
+ points to, with its byte size in NBYTES. */
unsigned HOST_WIDE_INT nbytes;
- const char *rep = getbyterep (src, &nbytes);
+ const char *rep = getbyterep (arg2, &nbytes);
+ if (result_eq && rep == NULL)
+ {
+ /* For equality to zero the arguments are interchangeable. */
+ rep = getbyterep (arg1, &nbytes);
+ if (rep != NULL)
+ std::swap (arg1_rtx, arg2_rtx);
+ }
/* If the function's constant bound LEN_RTX is less than or equal
to the byte size of the representation of the constant argument,
and if block move would be done by pieces, we can avoid loading
- the bytes from memory and only store the computed constant.
- This works in the overlap (memmove) case as well because
- store_by_pieces just generates a series of stores of constants
- from the representation returned by getbyterep(). */
+ the bytes from memory and only store the computed constant result. */
if (rep
&& CONST_INT_P (len_rtx)
- && (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= nbytes
- && can_store_by_pieces (INTVAL (len_rtx), builtin_memcpy_read_str,
- CONST_CAST (char *, rep),
- dest_align, false))
- {
- dest_mem = store_by_pieces (dest_mem, INTVAL (len_rtx),
- builtin_memcpy_read_str,
- CONST_CAST (char *, rep),
- dest_align, false, retmode);
- dest_mem = force_operand (XEXP (dest_mem, 0), target);
- dest_mem = convert_memory_address (ptr_mode, dest_mem);
- return dest_mem;
- }
+ && (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= nbytes)
+ constfn = builtin_memcpy_read_str;
- src_mem = get_memory_rtx (src, len);
- set_mem_align (src_mem, src_align);
+ result = emit_block_cmp_hints (arg1_rtx, arg2_rtx, len_rtx,
+ TREE_TYPE (len), target,
+ result_eq, constfn,
+ CONST_CAST (char *, rep));
- /* Copy word part most expediently. */
- enum block_op_methods method = BLOCK_OP_NORMAL;
- if (CALL_EXPR_TAILCALL (exp)
- && (retmode == RETURN_BEGIN || target == const0_rtx))
- method = BLOCK_OP_TAILCALL;
- bool use_mempcpy_call = (targetm.libc_has_fast_function (BUILT_IN_MEMPCPY)
- && retmode == RETURN_END
- && !might_overlap
- && target != const0_rtx);
- if (use_mempcpy_call)
- method = BLOCK_OP_NO_LIBCALL_RET;
- dest_addr = emit_block_move_hints (dest_mem, src_mem, len_rtx, method,
- expected_align, expected_size,
- min_size, max_size, probable_max_size,
- use_mempcpy_call, &is_move_done,
- might_overlap);
+ if (result)
+ {
+ /* Return the value in the proper mode for this function. */
+ if (GET_MODE (result) == mode)
+ return result;
- /* Bail out when a mempcpy call would be expanded as libcall and when
- we have a target that provides a fast implementation
- of mempcpy routine. */
- if (!is_move_done)
- return NULL_RTX;
+ if (target != 0)
+ {
+ convert_move (target, result, 0);
+ return target;
+ }
- if (dest_addr == pc_rtx)
- return NULL_RTX;
+ return convert_to_mode (mode, result, 0);
+ }
- if (dest_addr == 0)
- {
- dest_addr = force_operand (XEXP (dest_mem, 0), target);
- dest_addr = convert_memory_address (ptr_mode, dest_addr);
- }
-
- if (retmode != RETURN_BEGIN && target != const0_rtx)
- {
- dest_addr = gen_rtx_PLUS (ptr_mode, dest_addr, len_rtx);
- /* stpcpy pointer to last byte. */
- if (retmode == RETURN_END_MINUS_ONE)
- dest_addr = gen_rtx_MINUS (ptr_mode, dest_addr, const1_rtx);
- }
-
- return dest_addr;
-}
-
-static rtx
-expand_builtin_mempcpy_args (tree dest, tree src, tree len,
- rtx target, tree orig_exp, memop_ret retmode)
-{
- return expand_builtin_memory_copy_args (dest, src, len, target, orig_exp,
- retmode, false);
+ return NULL_RTX;
}
-/* Expand into a movstr instruction, if one is available. Return NULL_RTX if
- we failed, the caller should emit a normal call, otherwise try to
- get the result in TARGET, if convenient.
- Return value is based on RETMODE argument. */
+/* Expand expression EXP, which is a call to the strcmp builtin. Return NULL_RTX
+ if we failed the caller should emit a normal call, otherwise try to get
+ the result in TARGET, if convenient. */
static rtx
-expand_movstr (tree dest, tree src, rtx target, memop_ret retmode)
+expand_builtin_strcmp (tree exp, ATTRIBUTE_UNUSED rtx target)
{
- class expand_operand ops[3];
- rtx dest_mem;
- rtx src_mem;
-
- if (!targetm.have_movstr ())
+ if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
return NULL_RTX;
- dest_mem = get_memory_rtx (dest, NULL);
- src_mem = get_memory_rtx (src, NULL);
- if (retmode == RETURN_BEGIN)
- {
- target = force_reg (Pmode, XEXP (dest_mem, 0));
- dest_mem = replace_equiv_address (dest_mem, target);
- }
+ tree arg1 = CALL_EXPR_ARG (exp, 0);
+ tree arg2 = CALL_EXPR_ARG (exp, 1);
- create_output_operand (&ops[0],
- retmode != RETURN_BEGIN ? target : NULL_RTX, Pmode);
- create_fixed_operand (&ops[1], dest_mem);
- create_fixed_operand (&ops[2], src_mem);
- if (!maybe_expand_insn (targetm.code_for_movstr, 3, ops))
+ if (!check_read_access (exp, arg1)
+ || !check_read_access (exp, arg2))
return NULL_RTX;
- if (retmode != RETURN_BEGIN && target != const0_rtx)
- {
- target = ops[0].value;
- /* movstr is supposed to set end to the address of the NUL
- terminator. If the caller requested a mempcpy-like return value,
- adjust it. */
- if (retmode == RETURN_END)
- {
- rtx tem = plus_constant (GET_MODE (target),
- gen_lowpart (GET_MODE (target), target), 1);
- emit_move_insn (target, force_operand (tem, NULL_RTX));
- }
- }
- return target;
-}
+ /* Due to the performance benefit, always inline the calls first. */
+ rtx result = NULL_RTX;
+ result = inline_expand_builtin_bytecmp (exp, target);
+ if (result)
+ return result;
-/* Do some very basic size validation of a call to the strcpy builtin
- given by EXP. Return NULL_RTX to have the built-in expand to a call
- to the library function. */
+ insn_code cmpstr_icode = direct_optab_handler (cmpstr_optab, SImode);
+ insn_code cmpstrn_icode = direct_optab_handler (cmpstrn_optab, SImode);
+ if (cmpstr_icode == CODE_FOR_nothing && cmpstrn_icode == CODE_FOR_nothing)
+ return NULL_RTX;
-static rtx
-expand_builtin_strcat (tree exp)
-{
- if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
- || !warn_stringop_overflow)
+ unsigned int arg1_align = get_pointer_alignment (arg1) / BITS_PER_UNIT;
+ unsigned int arg2_align = get_pointer_alignment (arg2) / BITS_PER_UNIT;
+
+ /* If we don't have POINTER_TYPE, call the function. */
+ if (arg1_align == 0 || arg2_align == 0)
return NULL_RTX;
- tree dest = CALL_EXPR_ARG (exp, 0);
- tree src = CALL_EXPR_ARG (exp, 1);
+ /* Stabilize the arguments in case gen_cmpstr(n)si fail. */
+ arg1 = builtin_save_expr (arg1);
+ arg2 = builtin_save_expr (arg2);
- /* There is no way here to determine the length of the string in
- the destination to which the SRC string is being appended so
- just diagnose cases when the souce string is longer than
- the destination object. */
- access_data data (exp, access_read_write, NULL_TREE, true,
- NULL_TREE, true);
- const int ost = warn_stringop_overflow ? warn_stringop_overflow - 1 : 1;
- compute_objsize (src, ost, &data.src);
- tree destsize = compute_objsize (dest, ost, &data.dst);
+ rtx arg1_rtx = get_memory_rtx (arg1, NULL);
+ rtx arg2_rtx = get_memory_rtx (arg2, NULL);
- check_access (exp, /*dstwrite=*/NULL_TREE, /*maxread=*/NULL_TREE,
- src, destsize, data.mode, &data);
+ /* Try to call cmpstrsi. */
+ if (cmpstr_icode != CODE_FOR_nothing)
+ result = expand_cmpstr (cmpstr_icode, target, arg1_rtx, arg2_rtx,
+ MIN (arg1_align, arg2_align));
- return NULL_RTX;
-}
+ /* Try to determine at least one length and call cmpstrnsi. */
+ if (!result && cmpstrn_icode != CODE_FOR_nothing)
+ {
+ tree len;
+ rtx arg3_rtx;
-/* Expand expression EXP, which is a call to the strcpy builtin. Return
- NULL_RTX if we failed the caller should emit a normal call, otherwise
- try to get the result in TARGET, if convenient (and in mode MODE if that's
- convenient). */
+ tree len1 = c_strlen (arg1, 1);
+ tree len2 = c_strlen (arg2, 1);
-static rtx
-expand_builtin_strcpy (tree exp, rtx target)
-{
- if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
- return NULL_RTX;
+ if (len1)
+ len1 = size_binop (PLUS_EXPR, ssize_int (1), len1);
+ if (len2)
+ len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);
- tree dest = CALL_EXPR_ARG (exp, 0);
- tree src = CALL_EXPR_ARG (exp, 1);
+ /* If we don't have a constant length for the first, use the length
+ of the second, if we know it. We don't require a constant for
+ this case; some cost analysis could be done if both are available
+ but neither is constant. For now, assume they're equally cheap,
+ unless one has side effects. If both strings have constant lengths,
+ use the smaller. */
- if (warn_stringop_overflow)
- {
- access_data data (exp, access_read_write, NULL_TREE, true,
- NULL_TREE, true);
- const int ost = warn_stringop_overflow ? warn_stringop_overflow - 1 : 1;
- compute_objsize (src, ost, &data.src);
- tree dstsize = compute_objsize (dest, ost, &data.dst);
- check_access (exp, /*dstwrite=*/ NULL_TREE,
- /*maxread=*/ NULL_TREE, /*srcstr=*/ src,
- dstsize, data.mode, &data);
+ if (!len1)
+ len = len2;
+ else if (!len2)
+ len = len1;
+ else if (TREE_SIDE_EFFECTS (len1))
+ len = len2;
+ else if (TREE_SIDE_EFFECTS (len2))
+ len = len1;
+ else if (TREE_CODE (len1) != INTEGER_CST)
+ len = len2;
+ else if (TREE_CODE (len2) != INTEGER_CST)
+ len = len1;
+ else if (tree_int_cst_lt (len1, len2))
+ len = len1;
+ else
+ len = len2;
+
+ /* If both arguments have side effects, we cannot optimize. */
+ if (len && !TREE_SIDE_EFFECTS (len))
+ {
+ arg3_rtx = expand_normal (len);
+ result = expand_cmpstrn_or_cmpmem
+ (cmpstrn_icode, target, arg1_rtx, arg2_rtx, TREE_TYPE (len),
+ arg3_rtx, MIN (arg1_align, arg2_align));
+ }
}
- if (rtx ret = expand_builtin_strcpy_args (exp, dest, src, target))
+ tree fndecl = get_callee_fndecl (exp);
+ if (result)
{
/* Check to see if the argument was declared attribute nonstring
and if so, issue a warning since at this point it's not known
to be nul-terminated. */
- tree fndecl = get_callee_fndecl (exp);
maybe_warn_nonstring_arg (fndecl, exp);
- return ret;
- }
-
- return NULL_RTX;
-}
-
-/* Helper function to do the actual work for expand_builtin_strcpy. The
- arguments to the builtin_strcpy call DEST and SRC are broken out
- so that this can also be called without constructing an actual CALL_EXPR.
- The other arguments and return value are the same as for
- expand_builtin_strcpy. */
-static rtx
-expand_builtin_strcpy_args (tree exp, tree dest, tree src, rtx target)
-{
- /* Detect strcpy calls with unterminated arrays.. */
- tree size;
- bool exact;
- if (tree nonstr = unterminated_array (src, &size, &exact))
- {
- /* NONSTR refers to the non-nul terminated constant array. */
- warn_string_no_nul (EXPR_LOCATION (exp), exp, NULL, src, nonstr,
- size, exact);
- return NULL_RTX;
+ /* Return the value in the proper mode for this function. */
+ machine_mode mode = TYPE_MODE (TREE_TYPE (exp));
+ if (GET_MODE (result) == mode)
+ return result;
+ if (target == 0)
+ return convert_to_mode (mode, result, 0);
+ convert_move (target, result, 0);
+ return target;
}
- return expand_movstr (dest, src, target, /*retmode=*/ RETURN_BEGIN);
+ /* Expand the library call ourselves using a stabilized argument
+ list to avoid re-evaluating the function's arguments twice. */
+ tree fn = build_call_nofold_loc (EXPR_LOCATION (exp), fndecl, 2, arg1, arg2);
+ gcc_assert (TREE_CODE (fn) == CALL_EXPR);
+ CALL_EXPR_TAILCALL (fn) = CALL_EXPR_TAILCALL (exp);
+ return expand_call (fn, target, target == const0_rtx);
}
-/* Expand a call EXP to the stpcpy builtin.
- Return NULL_RTX if we failed the caller should emit a normal call,
- otherwise try to get the result in TARGET, if convenient (and in
- mode MODE if that's convenient). */
+/* Expand expression EXP, which is a call to the strncmp builtin. Return
+ NULL_RTX if we failed the caller should emit a normal call, otherwise
+ try to get the result in TARGET, if convenient. */
static rtx
-expand_builtin_stpcpy_1 (tree exp, rtx target, machine_mode mode)
+expand_builtin_strncmp (tree exp, ATTRIBUTE_UNUSED rtx target,
+ ATTRIBUTE_UNUSED machine_mode mode)
{
- tree dst, src;
- location_t loc = EXPR_LOCATION (exp);
+ if (!validate_arglist (exp,
+ POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ return NULL_RTX;
- if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
+ tree arg1 = CALL_EXPR_ARG (exp, 0);
+ tree arg2 = CALL_EXPR_ARG (exp, 1);
+ tree arg3 = CALL_EXPR_ARG (exp, 2);
+
+ if (!check_nul_terminated_array (exp, arg1, arg3)
+ || !check_nul_terminated_array (exp, arg2, arg3))
return NULL_RTX;
- dst = CALL_EXPR_ARG (exp, 0);
- src = CALL_EXPR_ARG (exp, 1);
+ location_t loc = EXPR_LOCATION (exp);
+ tree len1 = c_strlen (arg1, 1);
+ tree len2 = c_strlen (arg2, 1);
- if (warn_stringop_overflow)
+ if (!len1 || !len2)
{
- access_data data (exp, access_read_write);
- tree destsize = compute_objsize (dst, warn_stringop_overflow - 1,
- &data.dst);
- check_access (exp, /*dstwrite=*/NULL_TREE, /*maxread=*/NULL_TREE,
- src, destsize, data.mode, &data);
- }
-
- /* If return value is ignored, transform stpcpy into strcpy. */
- if (target == const0_rtx && builtin_decl_implicit (BUILT_IN_STRCPY))
- {
- tree fn = builtin_decl_implicit (BUILT_IN_STRCPY);
- tree result = build_call_nofold_loc (loc, fn, 2, dst, src);
- return expand_expr (result, target, mode, EXPAND_NORMAL);
- }
- else
- {
- tree len, lenp1;
- rtx ret;
-
- /* Ensure we get an actual string whose length can be evaluated at
- compile-time, not an expression containing a string. This is
- because the latter will potentially produce pessimized code
- when used to produce the return value. */
- c_strlen_data lendata = { };
- if (!c_getstr (src)
- || !(len = c_strlen (src, 0, &lendata, 1)))
- return expand_movstr (dst, src, target,
- /*retmode=*/ RETURN_END_MINUS_ONE);
-
- if (lendata.decl)
- warn_string_no_nul (EXPR_LOCATION (exp), exp, NULL, src, lendata.decl);
+ /* Check to see if the argument was declared attribute nonstring
+ and if so, issue a warning since at this point it's not known
+ to be nul-terminated. */
+ if (!maybe_warn_nonstring_arg (get_callee_fndecl (exp), exp)
+ && !len1 && !len2)
+ {
+ /* A strncmp read is constrained not just by the bound but
+ also by the length of the shorter string. Specifying
+ a bound that's larger than the size of either array makes
+ no sense and is likely a bug. When the length of neither
+ of the two strings is known but the sizes of both of
+ the arrays they are stored in is, issue a warning if
+ the bound is larger than than the size of the larger
+ of the two arrays. */
- lenp1 = size_binop_loc (loc, PLUS_EXPR, len, ssize_int (1));
- ret = expand_builtin_mempcpy_args (dst, src, lenp1,
- target, exp,
- /*retmode=*/ RETURN_END_MINUS_ONE);
+ access_ref ref1 (arg3, true);
+ access_ref ref2 (arg3, true);
- if (ret)
- return ret;
+ tree bndrng[2] = { NULL_TREE, NULL_TREE };
+ get_size_range (arg3, bndrng, ref1.bndrng);
- if (TREE_CODE (len) == INTEGER_CST)
- {
- rtx len_rtx = expand_normal (len);
+ tree size1 = compute_objsize (arg1, 1, &ref1);
+ tree size2 = compute_objsize (arg2, 1, &ref2);
+ tree func = get_callee_fndecl (exp);
- if (CONST_INT_P (len_rtx))
+ if (size1 && size2 && bndrng[0] && !integer_zerop (bndrng[0]))
{
- ret = expand_builtin_strcpy_args (exp, dst, src, target);
-
- if (ret)
+ offset_int rem1 = ref1.size_remaining ();
+ offset_int rem2 = ref2.size_remaining ();
+ if (rem1 == 0 || rem2 == 0)
+ maybe_warn_for_bound (OPT_Wstringop_overread, loc, exp, func,
+ bndrng, integer_zero_node);
+ else
{
- if (! target)
- {
- if (mode != VOIDmode)
- target = gen_reg_rtx (mode);
- else
- target = gen_reg_rtx (GET_MODE (ret));
- }
- if (GET_MODE (target) != GET_MODE (ret))
- ret = gen_lowpart (GET_MODE (target), ret);
-
- ret = plus_constant (GET_MODE (ret), ret, INTVAL (len_rtx));
- ret = emit_move_insn (target, force_operand (ret, NULL_RTX));
- gcc_assert (ret);
-
- return target;
+ offset_int maxrem = wi::max (rem1, rem2, UNSIGNED);
+ if (maxrem < wi::to_offset (bndrng[0]))
+ maybe_warn_for_bound (OPT_Wstringop_overread, loc, exp,
+ func, bndrng,
+ wide_int_to_tree (sizetype, maxrem));
}
}
+ else if (bndrng[0]
+ && !integer_zerop (bndrng[0])
+ && ((size1 && integer_zerop (size1))
+ || (size2 && integer_zerop (size2))))
+ maybe_warn_for_bound (OPT_Wstringop_overread, loc, exp, func,
+ bndrng, integer_zero_node);
}
-
- return expand_movstr (dst, src, target,
- /*retmode=*/ RETURN_END_MINUS_ONE);
}
-}
-/* Expand a call EXP to the stpcpy builtin and diagnose uses of nonstring
- arguments while being careful to avoid duplicate warnings (which could
- be issued if the expander were to expand the call, resulting in it
- being emitted in expand_call(). */
+ /* Due to the performance benefit, always inline the calls first. */
+ rtx result = NULL_RTX;
+ result = inline_expand_builtin_bytecmp (exp, target);
+ if (result)
+ return result;
-static rtx
-expand_builtin_stpcpy (tree exp, rtx target, machine_mode mode)
-{
- if (rtx ret = expand_builtin_stpcpy_1 (exp, target, mode))
- {
- /* The call has been successfully expanded. Check for nonstring
- arguments and issue warnings as appropriate. */
- maybe_warn_nonstring_arg (get_callee_fndecl (exp), exp);
- return ret;
- }
+ /* If c_strlen can determine an expression for one of the string
+ lengths, and it doesn't have side effects, then emit cmpstrnsi
+ using length MIN(strlen(string)+1, arg3). */
+ insn_code cmpstrn_icode = direct_optab_handler (cmpstrn_optab, SImode);
+ if (cmpstrn_icode == CODE_FOR_nothing)
+ return NULL_RTX;
- return NULL_RTX;
-}
+ tree len;
-/* Check a call EXP to the stpncpy built-in for validity.
- Return NULL_RTX on both success and failure. */
+ unsigned int arg1_align = get_pointer_alignment (arg1) / BITS_PER_UNIT;
+ unsigned int arg2_align = get_pointer_alignment (arg2) / BITS_PER_UNIT;
-static rtx
-expand_builtin_stpncpy (tree exp, rtx)
-{
- if (!validate_arglist (exp,
- POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
- || !warn_stringop_overflow)
- return NULL_RTX;
+ if (len1)
+ len1 = size_binop_loc (loc, PLUS_EXPR, ssize_int (1), len1);
+ if (len2)
+ len2 = size_binop_loc (loc, PLUS_EXPR, ssize_int (1), len2);
- /* The source and destination of the call. */
- tree dest = CALL_EXPR_ARG (exp, 0);
- tree src = CALL_EXPR_ARG (exp, 1);
+ tree len3 = fold_convert_loc (loc, sizetype, arg3);
- /* The exact number of bytes to write (not the maximum). */
- tree len = CALL_EXPR_ARG (exp, 2);
- access_data data (exp, access_read_write);
- /* The size of the destination object. */
- tree destsize = compute_objsize (dest, warn_stringop_overflow - 1, &data.dst);
- check_access (exp, len, /*maxread=*/len, src, destsize, data.mode, &data);
- return NULL_RTX;
-}
+ /* If we don't have a constant length for the first, use the length
+ of the second, if we know it. If neither string is constant length,
+ use the given length argument. We don't require a constant for
+ this case; some cost analysis could be done if both are available
+ but neither is constant. For now, assume they're equally cheap,
+ unless one has side effects. If both strings have constant lengths,
+ use the smaller. */
-/* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
- bytes from constant string DATA + OFFSET and return it as target
- constant. */
+ if (!len1 && !len2)
+ len = len3;
+ else if (!len1)
+ len = len2;
+ else if (!len2)
+ len = len1;
+ else if (TREE_SIDE_EFFECTS (len1))
+ len = len2;
+ else if (TREE_SIDE_EFFECTS (len2))
+ len = len1;
+ else if (TREE_CODE (len1) != INTEGER_CST)
+ len = len2;
+ else if (TREE_CODE (len2) != INTEGER_CST)
+ len = len1;
+ else if (tree_int_cst_lt (len1, len2))
+ len = len1;
+ else
+ len = len2;
-rtx
-builtin_strncpy_read_str (void *data, void *, HOST_WIDE_INT offset,
- scalar_int_mode mode)
-{
- const char *str = (const char *) data;
+ /* If we are not using the given length, we must incorporate it here.
+ The actual new length parameter will be MIN(len,arg3) in this case. */
+ if (len != len3)
+ {
+ len = fold_convert_loc (loc, sizetype, len);
+ len = fold_build2_loc (loc, MIN_EXPR, TREE_TYPE (len), len, len3);
+ }
+ rtx arg1_rtx = get_memory_rtx (arg1, len);
+ rtx arg2_rtx = get_memory_rtx (arg2, len);
+ rtx arg3_rtx = expand_normal (len);
+ result = expand_cmpstrn_or_cmpmem (cmpstrn_icode, target, arg1_rtx,
+ arg2_rtx, TREE_TYPE (len), arg3_rtx,
+ MIN (arg1_align, arg2_align));
- if ((unsigned HOST_WIDE_INT) offset > strlen (str))
- return const0_rtx;
+ tree fndecl = get_callee_fndecl (exp);
+ if (result)
+ {
+ /* Return the value in the proper mode for this function. */
+ mode = TYPE_MODE (TREE_TYPE (exp));
+ if (GET_MODE (result) == mode)
+ return result;
+ if (target == 0)
+ return convert_to_mode (mode, result, 0);
+ convert_move (target, result, 0);
+ return target;
+ }
- return c_readstr (str + offset, mode);
+ /* Expand the library call ourselves using a stabilized argument
+ list to avoid re-evaluating the function's arguments twice. */
+ tree call = build_call_nofold_loc (loc, fndecl, 3, arg1, arg2, len);
+ copy_warning (call, exp);
+ gcc_assert (TREE_CODE (call) == CALL_EXPR);
+ CALL_EXPR_TAILCALL (call) = CALL_EXPR_TAILCALL (exp);
+ return expand_call (call, target, target == const0_rtx);
}
-/* Helper to check the sizes of sequences and the destination of calls
- to __builtin_strncat and __builtin___strncat_chk. Returns true on
- success (no overflow or invalid sizes), false otherwise. */
+/* Expand a call to __builtin_saveregs, generating the result in TARGET,
+ if that's convenient. */
-static bool
-check_strncat_sizes (tree exp, tree objsize)
+rtx
+expand_builtin_saveregs (void)
{
- tree dest = CALL_EXPR_ARG (exp, 0);
- tree src = CALL_EXPR_ARG (exp, 1);
- tree maxread = CALL_EXPR_ARG (exp, 2);
+ rtx val;
+ rtx_insn *seq;
- /* Try to determine the range of lengths that the source expression
- refers to. */
- c_strlen_data lendata = { };
- get_range_strlen (src, &lendata, /* eltsize = */ 1);
+ /* Don't do __builtin_saveregs more than once in a function.
+ Save the result of the first call and reuse it. */
+ if (saveregs_value != 0)
+ return saveregs_value;
- /* Try to verify that the destination is big enough for the shortest
- string. */
+ /* When this function is called, it means that registers must be
+ saved on entry to this function. So we migrate the call to the
+ first insn of this function. */
- access_data data (exp, access_read_write, maxread, true);
- if (!objsize && warn_stringop_overflow)
- {
- /* If it hasn't been provided by __strncat_chk, try to determine
- the size of the destination object into which the source is
- being copied. */
- objsize = compute_objsize (dest, warn_stringop_overflow - 1, &data.dst);
- }
+ start_sequence ();
- /* Add one for the terminating nul. */
- tree srclen = (lendata.minlen
- ? fold_build2 (PLUS_EXPR, size_type_node, lendata.minlen,
- size_one_node)
- : NULL_TREE);
+ /* Do whatever the machine needs done in this case. */
+ val = targetm.calls.expand_builtin_saveregs ();
- /* The strncat function copies at most MAXREAD bytes and always appends
- the terminating nul so the specified upper bound should never be equal
- to (or greater than) the size of the destination. */
- if (tree_fits_uhwi_p (maxread) && tree_fits_uhwi_p (objsize)
- && tree_int_cst_equal (objsize, maxread))
- {
- location_t loc = EXPR_LOCATION (exp);
- warning_at (loc, OPT_Wstringop_overflow_,
- "%qD specified bound %E equals destination size",
- get_callee_fndecl (exp), maxread);
+ seq = get_insns ();
+ end_sequence ();
- return false;
- }
+ saveregs_value = val;
- if (!srclen
- || (maxread && tree_fits_uhwi_p (maxread)
- && tree_fits_uhwi_p (srclen)
- && tree_int_cst_lt (maxread, srclen)))
- srclen = maxread;
+ /* Put the insns after the NOTE that starts the function. If this
+ is inside a start_sequence, make the outer-level insn chain current, so
+ the code is placed at the start of the function. */
+ push_topmost_sequence ();
+ emit_insn_after (seq, entry_of_function ());
+ pop_topmost_sequence ();
- /* The number of bytes to write is LEN but check_access will alsoa
- check SRCLEN if LEN's value isn't known. */
- return check_access (exp, /*dstwrite=*/NULL_TREE, maxread, srclen,
- objsize, data.mode, &data);
+ return val;
}
-/* Similar to expand_builtin_strcat, do some very basic size validation
- of a call to the strcpy builtin given by EXP. Return NULL_RTX to have
- the built-in expand to a call to the library function. */
+/* Expand a call to __builtin_next_arg. */
static rtx
-expand_builtin_strncat (tree exp, rtx)
+expand_builtin_next_arg (void)
{
- if (!validate_arglist (exp,
- POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
- || !warn_stringop_overflow)
- return NULL_RTX;
+ /* Checking arguments is already done in fold_builtin_next_arg
+ that must be called before this function. */
+ return expand_binop (ptr_mode, add_optab,
+ crtl->args.internal_arg_pointer,
+ crtl->args.arg_offset_rtx,
+ NULL_RTX, 0, OPTAB_LIB_WIDEN);
+}
- tree dest = CALL_EXPR_ARG (exp, 0);
- tree src = CALL_EXPR_ARG (exp, 1);
- /* The upper bound on the number of bytes to write. */
- tree maxread = CALL_EXPR_ARG (exp, 2);
+/* Make it easier for the backends by protecting the valist argument
+ from multiple evaluations. */
- /* Detect unterminated source (only). */
- if (!check_nul_terminated_array (exp, src, maxread))
- return NULL_RTX;
+static tree
+stabilize_va_list_loc (location_t loc, tree valist, int needs_lvalue)
+{
+ tree vatype = targetm.canonical_va_list_type (TREE_TYPE (valist));
- /* The length of the source sequence. */
- tree slen = c_strlen (src, 1);
+ /* The current way of determining the type of valist is completely
+ bogus. We should have the information on the va builtin instead. */
+ if (!vatype)
+ vatype = targetm.fn_abi_va_list (cfun->decl);
- /* Try to determine the range of lengths that the source expression
- refers to. Since the lengths are only used for warning and not
- for code generation disable strict mode below. */
- tree maxlen = slen;
- if (!maxlen)
+ if (TREE_CODE (vatype) == ARRAY_TYPE)
{
- c_strlen_data lendata = { };
- get_range_strlen (src, &lendata, /* eltsize = */ 1);
- maxlen = lendata.maxbound;
- }
+ if (TREE_SIDE_EFFECTS (valist))
+ valist = save_expr (valist);
- access_data data (exp, access_read_write);
- /* Try to verify that the destination is big enough for the shortest
- string. First try to determine the size of the destination object
- into which the source is being copied. */
- tree destsize = compute_objsize (dest, warn_stringop_overflow - 1, &data.dst);
+ /* For this case, the backends will be expecting a pointer to
+ vatype, but it's possible we've actually been given an array
+ (an actual TARGET_CANONICAL_VA_LIST_TYPE (valist)).
+ So fix it. */
+ if (TREE_CODE (TREE_TYPE (valist)) == ARRAY_TYPE)
+ {
+ tree p1 = build_pointer_type (TREE_TYPE (vatype));
+ valist = build_fold_addr_expr_with_type_loc (loc, valist, p1);
+ }
+ }
+ else
+ {
+ tree pt = build_pointer_type (vatype);
- /* Add one for the terminating nul. */
- tree srclen = (maxlen
- ? fold_build2 (PLUS_EXPR, size_type_node, maxlen,
- size_one_node)
- : NULL_TREE);
+ if (! needs_lvalue)
+ {
+ if (! TREE_SIDE_EFFECTS (valist))
+ return valist;
- /* The strncat function copies at most MAXREAD bytes and always appends
- the terminating nul so the specified upper bound should never be equal
- to (or greater than) the size of the destination. */
- if (tree_fits_uhwi_p (maxread) && tree_fits_uhwi_p (destsize)
- && tree_int_cst_equal (destsize, maxread))
- {
- location_t loc = EXPR_LOCATION (exp);
- warning_at (loc, OPT_Wstringop_overflow_,
- "%qD specified bound %E equals destination size",
- get_callee_fndecl (exp), maxread);
+ valist = fold_build1_loc (loc, ADDR_EXPR, pt, valist);
+ TREE_SIDE_EFFECTS (valist) = 1;
+ }
- return NULL_RTX;
+ if (TREE_SIDE_EFFECTS (valist))
+ valist = save_expr (valist);
+ valist = fold_build2_loc (loc, MEM_REF,
+ vatype, valist, build_int_cst (pt, 0));
}
- if (!srclen
- || (maxread && tree_fits_uhwi_p (maxread)
- && tree_fits_uhwi_p (srclen)
- && tree_int_cst_lt (maxread, srclen)))
- srclen = maxread;
-
- check_access (exp, /*dstwrite=*/NULL_TREE, maxread, srclen,
- destsize, data.mode, &data);
- return NULL_RTX;
+ return valist;
}
-/* Expand expression EXP, which is a call to the strncpy builtin. Return
- NULL_RTX if we failed the caller should emit a normal call. */
+/* The "standard" definition of va_list is void*. */
-static rtx
-expand_builtin_strncpy (tree exp, rtx target)
+tree
+std_build_builtin_va_list (void)
{
- location_t loc = EXPR_LOCATION (exp);
+ return ptr_type_node;
+}
- if (!validate_arglist (exp,
- POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
- return NULL_RTX;
- tree dest = CALL_EXPR_ARG (exp, 0);
- tree src = CALL_EXPR_ARG (exp, 1);
- /* The number of bytes to write (not the maximum). */
- tree len = CALL_EXPR_ARG (exp, 2);
+/* The "standard" abi va_list is va_list_type_node. */
- /* The length of the source sequence. */
- tree slen = c_strlen (src, 1);
+tree
+std_fn_abi_va_list (tree fndecl ATTRIBUTE_UNUSED)
+{
+ return va_list_type_node;
+}
- if (warn_stringop_overflow)
- {
- access_data data (exp, access_read_write, len, true, len, true);
- const int ost = warn_stringop_overflow ? warn_stringop_overflow - 1 : 1;
- compute_objsize (src, ost, &data.src);
- tree dstsize = compute_objsize (dest, ost, &data.dst);
- /* The number of bytes to write is LEN but check_access will also
- check SLEN if LEN's value isn't known. */
- check_access (exp, /*dstwrite=*/len,
- /*maxread=*/len, src, dstsize, data.mode, &data);
- }
+/* The "standard" type of va_list is va_list_type_node. */
- /* We must be passed a constant len and src parameter. */
- if (!tree_fits_uhwi_p (len) || !slen || !tree_fits_uhwi_p (slen))
- return NULL_RTX;
+tree
+std_canonical_va_list_type (tree type)
+{
+ tree wtype, htype;
- slen = size_binop_loc (loc, PLUS_EXPR, slen, ssize_int (1));
+ wtype = va_list_type_node;
+ htype = type;
- /* We're required to pad with trailing zeros if the requested
- len is greater than strlen(s2)+1. In that case try to
- use store_by_pieces, if it fails, punt. */
- if (tree_int_cst_lt (slen, len))
+ if (TREE_CODE (wtype) == ARRAY_TYPE)
{
- unsigned int dest_align = get_pointer_alignment (dest);
- const char *p = c_getstr (src);
- rtx dest_mem;
+ /* If va_list is an array type, the argument may have decayed
+ to a pointer type, e.g. by being passed to another function.
+ In that case, unwrap both types so that we can compare the
+ underlying records. */
+ if (TREE_CODE (htype) == ARRAY_TYPE
+ || POINTER_TYPE_P (htype))
+ {
+ wtype = TREE_TYPE (wtype);
+ htype = TREE_TYPE (htype);
+ }
+ }
+ if (TYPE_MAIN_VARIANT (wtype) == TYPE_MAIN_VARIANT (htype))
+ return va_list_type_node;
- if (!p || dest_align == 0 || !tree_fits_uhwi_p (len)
- || !can_store_by_pieces (tree_to_uhwi (len),
- builtin_strncpy_read_str,
- CONST_CAST (char *, p),
- dest_align, false))
- return NULL_RTX;
+ return NULL_TREE;
+}
- dest_mem = get_memory_rtx (dest, len);
- store_by_pieces (dest_mem, tree_to_uhwi (len),
- builtin_strncpy_read_str,
- CONST_CAST (char *, p), dest_align, false,
- RETURN_BEGIN);
- dest_mem = force_operand (XEXP (dest_mem, 0), target);
- dest_mem = convert_memory_address (ptr_mode, dest_mem);
- return dest_mem;
- }
+/* The "standard" implementation of va_start: just assign `nextarg' to
+ the variable. */
- return NULL_RTX;
+void
+std_expand_builtin_va_start (tree valist, rtx nextarg)
+{
+ rtx va_r = expand_expr (valist, NULL_RTX, VOIDmode, EXPAND_WRITE);
+ convert_move (va_r, nextarg, 0);
}
-/* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
- bytes from constant string DATA + OFFSET and return it as target
- constant. If PREV isn't nullptr, it has the RTL info from the
- previous iteration. */
+/* Expand EXP, a call to __builtin_va_start. */
-rtx
-builtin_memset_read_str (void *data, void *prevp,
- HOST_WIDE_INT offset ATTRIBUTE_UNUSED,
- scalar_int_mode mode)
+static rtx
+expand_builtin_va_start (tree exp)
{
- by_pieces_prev *prev = (by_pieces_prev *) prevp;
- if (prev != nullptr && prev->data != nullptr)
+ rtx nextarg;
+ tree valist;
+ location_t loc = EXPR_LOCATION (exp);
+
+ if (call_expr_nargs (exp) < 2)
{
- /* Use the previous data in the same mode. */
- if (prev->mode == mode)
- return prev->data;
+ error_at (loc, "too few arguments to function %<va_start%>");
+ return const0_rtx;
}
- const char *c = (const char *) data;
- char *p = XALLOCAVEC (char, GET_MODE_SIZE (mode));
+ if (fold_builtin_next_arg (exp, true))
+ return const0_rtx;
- memset (p, *c, GET_MODE_SIZE (mode));
+ nextarg = expand_builtin_next_arg ();
+ valist = stabilize_va_list_loc (loc, CALL_EXPR_ARG (exp, 0), 1);
- return c_readstr (p, mode);
+ if (targetm.expand_builtin_va_start)
+ targetm.expand_builtin_va_start (valist, nextarg);
+ else
+ std_expand_builtin_va_start (valist, nextarg);
+
+ return const0_rtx;
}
-/* Callback routine for store_by_pieces. Return the RTL of a register
- containing GET_MODE_SIZE (MODE) consecutive copies of the unsigned
- char value given in the RTL register data. For example, if mode is
- 4 bytes wide, return the RTL for 0x01010101*data. If PREV isn't
- nullptr, it has the RTL info from the previous iteration. */
+/* Expand EXP, a call to __builtin_va_end. */
static rtx
-builtin_memset_gen_str (void *data, void *prevp,
- HOST_WIDE_INT offset ATTRIBUTE_UNUSED,
- scalar_int_mode mode)
+expand_builtin_va_end (tree exp)
{
- rtx target, coeff;
- size_t size;
- char *p;
-
- by_pieces_prev *prev = (by_pieces_prev *) prevp;
- if (prev != nullptr && prev->data != nullptr)
- {
- /* Use the previous data in the same mode. */
- if (prev->mode == mode)
- return prev->data;
-
- target = simplify_gen_subreg (mode, prev->data, prev->mode, 0);
- if (target != nullptr)
- return target;
- }
-
- size = GET_MODE_SIZE (mode);
- if (size == 1)
- return (rtx) data;
+ tree valist = CALL_EXPR_ARG (exp, 0);
- p = XALLOCAVEC (char, size);
- memset (p, 1, size);
- coeff = c_readstr (p, mode);
+ /* Evaluate for side effects, if needed. I hate macros that don't
+ do that. */
+ if (TREE_SIDE_EFFECTS (valist))
+ expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);
- target = convert_to_mode (mode, (rtx) data, 1);
- target = expand_mult (mode, target, coeff, NULL_RTX, 1);
- return force_reg (mode, target);
+ return const0_rtx;
}
-/* Expand expression EXP, which is a call to the memset builtin. Return
- NULL_RTX if we failed the caller should emit a normal call, otherwise
- try to get the result in TARGET, if convenient (and in mode MODE if that's
- convenient). */
+/* Expand EXP, a call to __builtin_va_copy. We do this as a
+ builtin rather than just as an assignment in stdarg.h because of the
+ nastiness of array-type va_list types. */
static rtx
-expand_builtin_memset (tree exp, rtx target, machine_mode mode)
+expand_builtin_va_copy (tree exp)
{
- if (!validate_arglist (exp,
- POINTER_TYPE, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
- return NULL_RTX;
+ tree dst, src, t;
+ location_t loc = EXPR_LOCATION (exp);
- tree dest = CALL_EXPR_ARG (exp, 0);
- tree val = CALL_EXPR_ARG (exp, 1);
- tree len = CALL_EXPR_ARG (exp, 2);
+ dst = CALL_EXPR_ARG (exp, 0);
+ src = CALL_EXPR_ARG (exp, 1);
- check_memop_access (exp, dest, NULL_TREE, len);
+ dst = stabilize_va_list_loc (loc, dst, 1);
+ src = stabilize_va_list_loc (loc, src, 0);
- return expand_builtin_memset_args (dest, val, len, target, mode, exp);
-}
+ gcc_assert (cfun != NULL && cfun->decl != NULL_TREE);
-/* Try to store VAL (or, if NULL_RTX, VALC) in LEN bytes starting at TO.
- Return TRUE if successful, FALSE otherwise. TO is assumed to be
- aligned at an ALIGN-bits boundary. LEN must be a multiple of
- 1<<CTZ_LEN between MIN_LEN and MAX_LEN.
+ if (TREE_CODE (targetm.fn_abi_va_list (cfun->decl)) != ARRAY_TYPE)
+ {
+ t = build2 (MODIFY_EXPR, targetm.fn_abi_va_list (cfun->decl), dst, src);
+ TREE_SIDE_EFFECTS (t) = 1;
+ expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
+ }
+ else
+ {
+ rtx dstb, srcb, size;
- The strategy is to issue one store_by_pieces for each power of two,
- from most to least significant, guarded by a test on whether there
- are at least that many bytes left to copy in LEN.
+ /* Evaluate to pointers. */
+ dstb = expand_expr (dst, NULL_RTX, Pmode, EXPAND_NORMAL);
+ srcb = expand_expr (src, NULL_RTX, Pmode, EXPAND_NORMAL);
+ size = expand_expr (TYPE_SIZE_UNIT (targetm.fn_abi_va_list (cfun->decl)),
+ NULL_RTX, VOIDmode, EXPAND_NORMAL);
- ??? Should we skip some powers of two in favor of loops? Maybe start
- at the max of TO/LEN/word alignment, at least when optimizing for
- size, instead of ensuring O(log len) dynamic compares? */
+ dstb = convert_memory_address (Pmode, dstb);
+ srcb = convert_memory_address (Pmode, srcb);
-bool
-try_store_by_multiple_pieces (rtx to, rtx len, unsigned int ctz_len,
- unsigned HOST_WIDE_INT min_len,
- unsigned HOST_WIDE_INT max_len,
- rtx val, char valc, unsigned int align)
-{
- int max_bits = floor_log2 (max_len);
- int min_bits = floor_log2 (min_len);
- int sctz_len = ctz_len;
+ /* "Dereference" to BLKmode memories. */
+ dstb = gen_rtx_MEM (BLKmode, dstb);
+ set_mem_alias_set (dstb, get_alias_set (TREE_TYPE (TREE_TYPE (dst))));
+ set_mem_align (dstb, TYPE_ALIGN (targetm.fn_abi_va_list (cfun->decl)));
+ srcb = gen_rtx_MEM (BLKmode, srcb);
+ set_mem_alias_set (srcb, get_alias_set (TREE_TYPE (TREE_TYPE (src))));
+ set_mem_align (srcb, TYPE_ALIGN (targetm.fn_abi_va_list (cfun->decl)));
- gcc_checking_assert (sctz_len >= 0);
+ /* Copy. */
+ emit_block_move (dstb, srcb, size, BLOCK_OP_NORMAL);
+ }
- if (val)
- valc = 1;
+ return const0_rtx;
+}
- /* Bits more significant than TST_BITS are part of the shared prefix
- in the binary representation of both min_len and max_len. Since
- they're identical, we don't need to test them in the loop. */
- int tst_bits = (max_bits != min_bits ? max_bits
- : floor_log2 (max_len ^ min_len));
+/* Expand a call to one of the builtin functions __builtin_frame_address or
+ __builtin_return_address. */
- /* Check whether it's profitable to start by storing a fixed BLKSIZE
- bytes, to lower max_bits. In the unlikely case of a constant LEN
- (implied by identical MAX_LEN and MIN_LEN), we want to issue a
- single store_by_pieces, but otherwise, select the minimum multiple
- of the ALIGN (in bytes) and of the MCD of the possible LENs, that
- brings MAX_LEN below TST_BITS, if that's lower than min_len. */
- unsigned HOST_WIDE_INT blksize;
- if (max_len > min_len)
+static rtx
+expand_builtin_frame_address (tree fndecl, tree exp)
+{
+ /* The argument must be a nonnegative integer constant.
+ It counts the number of frames to scan up the stack.
+ The value is either the frame pointer value or the return
+ address saved in that frame. */
+ if (call_expr_nargs (exp) == 0)
+ /* Warning about missing arg was already issued. */
+ return const0_rtx;
+ else if (! tree_fits_uhwi_p (CALL_EXPR_ARG (exp, 0)))
{
- unsigned HOST_WIDE_INT alrng = MAX (HOST_WIDE_INT_1U << ctz_len,
- align / BITS_PER_UNIT);
- blksize = max_len - (HOST_WIDE_INT_1U << tst_bits) + alrng;
- blksize &= ~(alrng - 1);
+ error ("invalid argument to %qD", fndecl);
+ return const0_rtx;
}
- else if (max_len == min_len)
- blksize = max_len;
else
- gcc_unreachable ();
- if (min_len >= blksize)
{
- min_len -= blksize;
- min_bits = floor_log2 (min_len);
- max_len -= blksize;
- max_bits = floor_log2 (max_len);
-
- tst_bits = (max_bits != min_bits ? max_bits
- : floor_log2 (max_len ^ min_len));
- }
- else
- blksize = 0;
+ /* Number of frames to scan up the stack. */
+ unsigned HOST_WIDE_INT count = tree_to_uhwi (CALL_EXPR_ARG (exp, 0));
- /* Check that we can use store by pieces for the maximum store count
- we may issue (initial fixed-size block, plus conditional
- power-of-two-sized from max_bits to ctz_len. */
- unsigned HOST_WIDE_INT xlenest = blksize;
- if (max_bits >= 0)
- xlenest += ((HOST_WIDE_INT_1U << max_bits) * 2
- - (HOST_WIDE_INT_1U << ctz_len));
- if (!can_store_by_pieces (xlenest, builtin_memset_read_str,
- &valc, align, true))
- return false;
+ rtx tem = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl), count);
- rtx (*constfun) (void *, void *, HOST_WIDE_INT, scalar_int_mode);
- void *constfundata;
- if (val)
- {
- constfun = builtin_memset_gen_str;
- constfundata = val = force_reg (TYPE_MODE (unsigned_char_type_node),
- val);
- }
- else
- {
- constfun = builtin_memset_read_str;
- constfundata = &valc;
- }
+ /* Some ports cannot access arbitrary stack frames. */
+ if (tem == NULL)
+ {
+ warning (0, "unsupported argument to %qD", fndecl);
+ return const0_rtx;
+ }
- rtx ptr = copy_addr_to_reg (convert_to_mode (ptr_mode, XEXP (to, 0), 0));
- rtx rem = copy_to_mode_reg (ptr_mode, convert_to_mode (ptr_mode, len, 0));
- to = replace_equiv_address (to, ptr);
- set_mem_align (to, align);
+ if (count)
+ {
+ /* Warn since no effort is made to ensure that any frame
+ beyond the current one exists or can be safely reached. */
+ warning (OPT_Wframe_address, "calling %qD with "
+ "a nonzero argument is unsafe", fndecl);
+ }
- if (blksize)
- {
- to = store_by_pieces (to, blksize,
- constfun, constfundata,
- align, true,
- max_len != 0 ? RETURN_END : RETURN_BEGIN);
- if (max_len == 0)
- return true;
+ /* For __builtin_frame_address, return what we've got. */
+ if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
+ return tem;
- /* Adjust PTR, TO and REM. Since TO's address is likely
- PTR+offset, we have to replace it. */
- emit_move_insn (ptr, force_operand (XEXP (to, 0), NULL_RTX));
- to = replace_equiv_address (to, ptr);
- rtx rem_minus_blksize = plus_constant (ptr_mode, rem, -blksize);
- emit_move_insn (rem, force_operand (rem_minus_blksize, NULL_RTX));
+ if (!REG_P (tem)
+ && ! CONSTANT_P (tem))
+ tem = copy_addr_to_reg (tem);
+ return tem;
}
+}
- /* Iterate over power-of-two block sizes from the maximum length to
- the least significant bit possibly set in the length. */
- for (int i = max_bits; i >= sctz_len; i--)
- {
- rtx_code_label *label = NULL;
- blksize = HOST_WIDE_INT_1U << i;
+/* Expand EXP, a call to the alloca builtin. Return NULL_RTX if we
+ failed and the caller should emit a normal call. */
- /* If we're past the bits shared between min_ and max_len, expand
- a test on the dynamic length, comparing it with the
- BLKSIZE. */
- if (i <= tst_bits)
- {
- label = gen_label_rtx ();
- emit_cmp_and_jump_insns (rem, GEN_INT (blksize), LT, NULL,
- ptr_mode, 1, label,
- profile_probability::even ());
- }
- /* If we are at a bit that is in the prefix shared by min_ and
- max_len, skip this BLKSIZE if the bit is clear. */
- else if ((max_len & blksize) == 0)
- continue;
+static rtx
+expand_builtin_alloca (tree exp)
+{
+ rtx op0;
+ rtx result;
+ unsigned int align;
+ tree fndecl = get_callee_fndecl (exp);
+ HOST_WIDE_INT max_size;
+ enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
+ bool alloca_for_var = CALL_ALLOCA_FOR_VAR_P (exp);
+ bool valid_arglist
+ = (fcode == BUILT_IN_ALLOCA_WITH_ALIGN_AND_MAX
+ ? validate_arglist (exp, INTEGER_TYPE, INTEGER_TYPE, INTEGER_TYPE,
+ VOID_TYPE)
+ : fcode == BUILT_IN_ALLOCA_WITH_ALIGN
+ ? validate_arglist (exp, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE)
+ : validate_arglist (exp, INTEGER_TYPE, VOID_TYPE));
- /* Issue a store of BLKSIZE bytes. */
- to = store_by_pieces (to, blksize,
- constfun, constfundata,
- align, true,
- i != sctz_len ? RETURN_END : RETURN_BEGIN);
+ if (!valid_arglist)
+ return NULL_RTX;
- /* Adjust REM and PTR, unless this is the last iteration. */
- if (i != sctz_len)
- {
- emit_move_insn (ptr, force_operand (XEXP (to, 0), NULL_RTX));
- to = replace_equiv_address (to, ptr);
- rtx rem_minus_blksize = plus_constant (ptr_mode, rem, -blksize);
- emit_move_insn (rem, force_operand (rem_minus_blksize, NULL_RTX));
- }
+ if ((alloca_for_var
+ && warn_vla_limit >= HOST_WIDE_INT_MAX
+ && warn_alloc_size_limit < warn_vla_limit)
+ || (!alloca_for_var
+ && warn_alloca_limit >= HOST_WIDE_INT_MAX
+ && warn_alloc_size_limit < warn_alloca_limit
+ ))
+ {
+ /* -Walloca-larger-than and -Wvla-larger-than settings of
+ less than HOST_WIDE_INT_MAX override the more general
+ -Walloc-size-larger-than so unless either of the former
+ options is smaller than the last one (wchich would imply
+ that the call was already checked), check the alloca
+ arguments for overflow. */
+ tree args[] = { CALL_EXPR_ARG (exp, 0), NULL_TREE };
+ int idx[] = { 0, -1 };
+ maybe_warn_alloc_args_overflow (fndecl, exp, args, idx);
+ }
- if (label)
- {
- emit_label (label);
+ /* Compute the argument. */
+ op0 = expand_normal (CALL_EXPR_ARG (exp, 0));
- /* Given conditional stores, the offset can no longer be
- known, so clear it. */
- clear_mem_offset (to);
- }
- }
+ /* Compute the alignment. */
+ align = (fcode == BUILT_IN_ALLOCA
+ ? BIGGEST_ALIGNMENT
+ : TREE_INT_CST_LOW (CALL_EXPR_ARG (exp, 1)));
- return true;
+ /* Compute the maximum size. */
+ max_size = (fcode == BUILT_IN_ALLOCA_WITH_ALIGN_AND_MAX
+ ? TREE_INT_CST_LOW (CALL_EXPR_ARG (exp, 2))
+ : -1);
+
+ /* Allocate the desired space. If the allocation stems from the declaration
+ of a variable-sized object, it cannot accumulate. */
+ result
+ = allocate_dynamic_stack_space (op0, 0, align, max_size, alloca_for_var);
+ result = convert_memory_address (ptr_mode, result);
+
+ /* Dynamic allocations for variables are recorded during gimplification. */
+ if (!alloca_for_var && (flag_callgraph_info & CALLGRAPH_INFO_DYNAMIC_ALLOC))
+ record_dynamic_alloc (exp);
+
+ return result;
}
-/* Helper function to do the actual work for expand_builtin_memset. The
- arguments to the builtin_memset call DEST, VAL, and LEN are broken out
- so that this can also be called without constructing an actual CALL_EXPR.
- The other arguments and return value are the same as for
- expand_builtin_memset. */
+/* Emit a call to __asan_allocas_unpoison call in EXP. Add to second argument
+ of the call virtual_stack_dynamic_rtx - stack_pointer_rtx, which is the
+ STACK_DYNAMIC_OFFSET value. See motivation for this in comment to
+ handle_builtin_stack_restore function. */
static rtx
-expand_builtin_memset_args (tree dest, tree val, tree len,
- rtx target, machine_mode mode, tree orig_exp)
+expand_asan_emit_allocas_unpoison (tree exp)
{
- tree fndecl, fn;
- enum built_in_function fcode;
- machine_mode val_mode;
- char c;
- unsigned int dest_align;
- rtx dest_mem, dest_addr, len_rtx;
- HOST_WIDE_INT expected_size = -1;
- unsigned int expected_align = 0;
- unsigned HOST_WIDE_INT min_size;
- unsigned HOST_WIDE_INT max_size;
- unsigned HOST_WIDE_INT probable_max_size;
+ tree arg0 = CALL_EXPR_ARG (exp, 0);
+ tree arg1 = CALL_EXPR_ARG (exp, 1);
+ rtx top = expand_expr (arg0, NULL_RTX, ptr_mode, EXPAND_NORMAL);
+ rtx bot = expand_expr (arg1, NULL_RTX, ptr_mode, EXPAND_NORMAL);
+ rtx off = expand_simple_binop (Pmode, MINUS, virtual_stack_dynamic_rtx,
+ stack_pointer_rtx, NULL_RTX, 0,
+ OPTAB_LIB_WIDEN);
+ off = convert_modes (ptr_mode, Pmode, off, 0);
+ bot = expand_simple_binop (ptr_mode, PLUS, bot, off, NULL_RTX, 0,
+ OPTAB_LIB_WIDEN);
+ rtx ret = init_one_libfunc ("__asan_allocas_unpoison");
+ ret = emit_library_call_value (ret, NULL_RTX, LCT_NORMAL, ptr_mode,
+ top, ptr_mode, bot, ptr_mode);
+ return ret;
+}
- dest_align = get_pointer_alignment (dest);
+/* Expand a call to bswap builtin in EXP.
+ Return NULL_RTX if a normal call should be emitted rather than expanding the
+ function in-line. If convenient, the result should be placed in TARGET.
+ SUBTARGET may be used as the target for computing one of EXP's operands. */
- /* If DEST is not a pointer type, don't do this operation in-line. */
- if (dest_align == 0)
+static rtx
+expand_builtin_bswap (machine_mode target_mode, tree exp, rtx target,
+ rtx subtarget)
+{
+ tree arg;
+ rtx op0;
+
+ if (!validate_arglist (exp, INTEGER_TYPE, VOID_TYPE))
return NULL_RTX;
- if (currently_expanding_gimple_stmt)
- stringop_block_profile (currently_expanding_gimple_stmt,
- &expected_align, &expected_size);
+ arg = CALL_EXPR_ARG (exp, 0);
+ op0 = expand_expr (arg,
+ subtarget && GET_MODE (subtarget) == target_mode
+ ? subtarget : NULL_RTX,
+ target_mode, EXPAND_NORMAL);
+ if (GET_MODE (op0) != target_mode)
+ op0 = convert_to_mode (target_mode, op0, 1);
- if (expected_align < dest_align)
- expected_align = dest_align;
+ target = expand_unop (target_mode, bswap_optab, op0, target, 1);
- /* If the LEN parameter is zero, return DEST. */
- if (integer_zerop (len))
- {
- /* Evaluate and ignore VAL in case it has side-effects. */
- expand_expr (val, const0_rtx, VOIDmode, EXPAND_NORMAL);
- return expand_expr (dest, target, mode, EXPAND_NORMAL);
- }
+ gcc_assert (target);
- /* Stabilize the arguments in case we fail. */
- dest = builtin_save_expr (dest);
- val = builtin_save_expr (val);
- len = builtin_save_expr (len);
+ return convert_to_mode (target_mode, target, 1);
+}
- len_rtx = expand_normal (len);
- determine_block_size (len, len_rtx, &min_size, &max_size,
- &probable_max_size);
- dest_mem = get_memory_rtx (dest, len);
- val_mode = TYPE_MODE (unsigned_char_type_node);
+/* Expand a call to a unary builtin in EXP.
+ Return NULL_RTX if a normal call should be emitted rather than expanding the
+ function in-line. If convenient, the result should be placed in TARGET.
+ SUBTARGET may be used as the target for computing one of EXP's operands. */
- if (TREE_CODE (val) != INTEGER_CST
- || target_char_cast (val, &c))
- {
- rtx val_rtx;
+static rtx
+expand_builtin_unop (machine_mode target_mode, tree exp, rtx target,
+ rtx subtarget, optab op_optab)
+{
+ rtx op0;
- val_rtx = expand_normal (val);
- val_rtx = convert_to_mode (val_mode, val_rtx, 0);
+ if (!validate_arglist (exp, INTEGER_TYPE, VOID_TYPE))
+ return NULL_RTX;
- /* Assume that we can memset by pieces if we can store
- * the coefficients by pieces (in the required modes).
- * We can't pass builtin_memset_gen_str as that emits RTL. */
- c = 1;
- if (tree_fits_uhwi_p (len)
- && can_store_by_pieces (tree_to_uhwi (len),
- builtin_memset_read_str, &c, dest_align,
- true))
- {
- val_rtx = force_reg (val_mode, val_rtx);
- store_by_pieces (dest_mem, tree_to_uhwi (len),
- builtin_memset_gen_str, val_rtx, dest_align,
- true, RETURN_BEGIN);
- }
- else if (!set_storage_via_setmem (dest_mem, len_rtx, val_rtx,
- dest_align, expected_align,
- expected_size, min_size, max_size,
- probable_max_size)
- && !try_store_by_multiple_pieces (dest_mem, len_rtx,
- tree_ctz (len),
- min_size, max_size,
- val_rtx, 0,
- dest_align))
- goto do_libcall;
+ /* Compute the argument. */
+ op0 = expand_expr (CALL_EXPR_ARG (exp, 0),
+ (subtarget
+ && (TYPE_MODE (TREE_TYPE (CALL_EXPR_ARG (exp, 0)))
+ == GET_MODE (subtarget))) ? subtarget : NULL_RTX,
+ VOIDmode, EXPAND_NORMAL);
+ /* Compute op, into TARGET if possible.
+ Set TARGET to wherever the result comes back. */
+ target = expand_unop (TYPE_MODE (TREE_TYPE (CALL_EXPR_ARG (exp, 0))),
+ op_optab, op0, target, op_optab != clrsb_optab);
+ gcc_assert (target);
- dest_mem = force_operand (XEXP (dest_mem, 0), NULL_RTX);
- dest_mem = convert_memory_address (ptr_mode, dest_mem);
- return dest_mem;
- }
+ return convert_to_mode (target_mode, target, 0);
+}
- if (c)
- {
- if (tree_fits_uhwi_p (len)
- && can_store_by_pieces (tree_to_uhwi (len),
- builtin_memset_read_str, &c, dest_align,
- true))
- store_by_pieces (dest_mem, tree_to_uhwi (len),
- builtin_memset_read_str, &c, dest_align, true,
- RETURN_BEGIN);
- else if (!set_storage_via_setmem (dest_mem, len_rtx,
- gen_int_mode (c, val_mode),
- dest_align, expected_align,
- expected_size, min_size, max_size,
- probable_max_size)
- && !try_store_by_multiple_pieces (dest_mem, len_rtx,
- tree_ctz (len),
- min_size, max_size,
- NULL_RTX, c,
- dest_align))
- goto do_libcall;
+/* Expand a call to __builtin_expect. We just return our argument
+ as the builtin_expect semantic should've been already executed by
+ tree branch prediction pass. */
- dest_mem = force_operand (XEXP (dest_mem, 0), NULL_RTX);
- dest_mem = convert_memory_address (ptr_mode, dest_mem);
- return dest_mem;
- }
+static rtx
+expand_builtin_expect (tree exp, rtx target)
+{
+ tree arg;
- set_mem_align (dest_mem, dest_align);
- dest_addr = clear_storage_hints (dest_mem, len_rtx,
- CALL_EXPR_TAILCALL (orig_exp)
- ? BLOCK_OP_TAILCALL : BLOCK_OP_NORMAL,
- expected_align, expected_size,
- min_size, max_size,
- probable_max_size, tree_ctz (len));
+ if (call_expr_nargs (exp) < 2)
+ return const0_rtx;
+ arg = CALL_EXPR_ARG (exp, 0);
- if (dest_addr == 0)
- {
- dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
- dest_addr = convert_memory_address (ptr_mode, dest_addr);
- }
+ target = expand_expr (arg, target, VOIDmode, EXPAND_NORMAL);
+ /* When guessing was done, the hints should be already stripped away. */
+ gcc_assert (!flag_guess_branch_prob
+ || optimize == 0 || seen_error ());
+ return target;
+}
- return dest_addr;
+/* Expand a call to __builtin_expect_with_probability. We just return our
+ argument as the builtin_expect semantic should've been already executed by
+ tree branch prediction pass. */
- do_libcall:
- fndecl = get_callee_fndecl (orig_exp);
- fcode = DECL_FUNCTION_CODE (fndecl);
- if (fcode == BUILT_IN_MEMSET)
- fn = build_call_nofold_loc (EXPR_LOCATION (orig_exp), fndecl, 3,
- dest, val, len);
- else if (fcode == BUILT_IN_BZERO)
- fn = build_call_nofold_loc (EXPR_LOCATION (orig_exp), fndecl, 2,
- dest, len);
- else
- gcc_unreachable ();
- gcc_assert (TREE_CODE (fn) == CALL_EXPR);
- CALL_EXPR_TAILCALL (fn) = CALL_EXPR_TAILCALL (orig_exp);
- return expand_call (fn, target, target == const0_rtx);
+static rtx
+expand_builtin_expect_with_probability (tree exp, rtx target)
+{
+ tree arg;
+
+ if (call_expr_nargs (exp) < 3)
+ return const0_rtx;
+ arg = CALL_EXPR_ARG (exp, 0);
+
+ target = expand_expr (arg, target, VOIDmode, EXPAND_NORMAL);
+ /* When guessing was done, the hints should be already stripped away. */
+ gcc_assert (!flag_guess_branch_prob
+ || optimize == 0 || seen_error ());
+ return target;
}
-/* Expand expression EXP, which is a call to the bzero builtin. Return
- NULL_RTX if we failed the caller should emit a normal call. */
+
+/* Expand a call to __builtin_assume_aligned. We just return our first
+ argument as the builtin_assume_aligned semantic should've been already
+ executed by CCP. */
static rtx
-expand_builtin_bzero (tree exp)
+expand_builtin_assume_aligned (tree exp, rtx target)
{
- if (!validate_arglist (exp, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
- return NULL_RTX;
-
- tree dest = CALL_EXPR_ARG (exp, 0);
- tree size = CALL_EXPR_ARG (exp, 1);
+ if (call_expr_nargs (exp) < 2)
+ return const0_rtx;
+ target = expand_expr (CALL_EXPR_ARG (exp, 0), target, VOIDmode,
+ EXPAND_NORMAL);
+ gcc_assert (!TREE_SIDE_EFFECTS (CALL_EXPR_ARG (exp, 1))
+ && (call_expr_nargs (exp) < 3
+ || !TREE_SIDE_EFFECTS (CALL_EXPR_ARG (exp, 2))));
+ return target;
+}
- check_memop_access (exp, dest, NULL_TREE, size);
+void
+expand_builtin_trap (void)
+{
+ if (targetm.have_trap ())
+ {
+ rtx_insn *insn = emit_insn (targetm.gen_trap ());
+ /* For trap insns when not accumulating outgoing args force
+ REG_ARGS_SIZE note to prevent crossjumping of calls with
+ different args sizes. */
+ if (!ACCUMULATE_OUTGOING_ARGS)
+ add_args_size_note (insn, stack_pointer_delta);
+ }
+ else
+ {
+ tree fn = builtin_decl_implicit (BUILT_IN_ABORT);
+ tree call_expr = build_call_expr (fn, 0);
+ expand_call (call_expr, NULL_RTX, false);
+ }
- /* New argument list transforming bzero(ptr x, int y) to
- memset(ptr x, int 0, size_t y). This is done this way
- so that if it isn't expanded inline, we fallback to
- calling bzero instead of memset. */
+ emit_barrier ();
+}
- location_t loc = EXPR_LOCATION (exp);
+/* Expand a call to __builtin_unreachable. We do nothing except emit
+ a barrier saying that control flow will not pass here.
- return expand_builtin_memset_args (dest, integer_zero_node,
- fold_convert_loc (loc,
- size_type_node, size),
- const0_rtx, VOIDmode, exp);
+ It is the responsibility of the program being compiled to ensure
+ that control flow does never reach __builtin_unreachable. */
+static void
+expand_builtin_unreachable (void)
+{
+ emit_barrier ();
}
-/* Try to expand cmpstr operation ICODE with the given operands.
- Return the result rtx on success, otherwise return null. */
+/* Expand EXP, a call to fabs, fabsf or fabsl.
+ Return NULL_RTX if a normal call should be emitted rather than expanding
+ the function inline. If convenient, the result should be placed
+ in TARGET. SUBTARGET may be used as the target for computing
+ the operand. */
static rtx
-expand_cmpstr (insn_code icode, rtx target, rtx arg1_rtx, rtx arg2_rtx,
- HOST_WIDE_INT align)
+expand_builtin_fabs (tree exp, rtx target, rtx subtarget)
{
- machine_mode insn_mode = insn_data[icode].operand[0].mode;
+ machine_mode mode;
+ tree arg;
+ rtx op0;
- if (target && (!REG_P (target) || HARD_REGISTER_P (target)))
- target = NULL_RTX;
+ if (!validate_arglist (exp, REAL_TYPE, VOID_TYPE))
+ return NULL_RTX;
- class expand_operand ops[4];
- create_output_operand (&ops[0], target, insn_mode);
- create_fixed_operand (&ops[1], arg1_rtx);
- create_fixed_operand (&ops[2], arg2_rtx);
- create_integer_operand (&ops[3], align);
- if (maybe_expand_insn (icode, 4, ops))
- return ops[0].value;
- return NULL_RTX;
+ arg = CALL_EXPR_ARG (exp, 0);
+ CALL_EXPR_ARG (exp, 0) = arg = builtin_save_expr (arg);
+ mode = TYPE_MODE (TREE_TYPE (arg));
+ op0 = expand_expr (arg, subtarget, VOIDmode, EXPAND_NORMAL);
+ return expand_abs (mode, op0, target, 0, safe_from_p (target, arg, 1));
}
-/* Expand expression EXP, which is a call to the memcmp built-in function.
- Return NULL_RTX if we failed and the caller should emit a normal call,
- otherwise try to get the result in TARGET, if convenient.
- RESULT_EQ is true if we can relax the returned value to be either zero
- or nonzero, without caring about the sign. */
+/* Expand EXP, a call to copysign, copysignf, or copysignl.
+ Return NULL is a normal call should be emitted rather than expanding the
+ function inline. If convenient, the result should be placed in TARGET.
+ SUBTARGET may be used as the target for computing the operand. */
static rtx
-expand_builtin_memcmp (tree exp, rtx target, bool result_eq)
+expand_builtin_copysign (tree exp, rtx target, rtx subtarget)
{
- if (!validate_arglist (exp,
- POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ rtx op0, op1;
+ tree arg;
+
+ if (!validate_arglist (exp, REAL_TYPE, REAL_TYPE, VOID_TYPE))
return NULL_RTX;
- tree arg1 = CALL_EXPR_ARG (exp, 0);
- tree arg2 = CALL_EXPR_ARG (exp, 1);
- tree len = CALL_EXPR_ARG (exp, 2);
+ arg = CALL_EXPR_ARG (exp, 0);
+ op0 = expand_expr (arg, subtarget, VOIDmode, EXPAND_NORMAL);
- /* Diagnose calls where the specified length exceeds the size of either
- object. */
- if (!check_read_access (exp, arg1, len, 0)
- || !check_read_access (exp, arg2, len, 0))
- return NULL_RTX;
+ arg = CALL_EXPR_ARG (exp, 1);
+ op1 = expand_normal (arg);
- /* Due to the performance benefit, always inline the calls first
- when result_eq is false. */
- rtx result = NULL_RTX;
- enum built_in_function fcode = DECL_FUNCTION_CODE (get_callee_fndecl (exp));
- if (!result_eq && fcode != BUILT_IN_BCMP)
- {
- result = inline_expand_builtin_bytecmp (exp, target);
- if (result)
- return result;
- }
+ return expand_copysign (op0, op1, target);
+}
- machine_mode mode = TYPE_MODE (TREE_TYPE (exp));
- location_t loc = EXPR_LOCATION (exp);
+/* Emit a call to __builtin___clear_cache. */
- unsigned int arg1_align = get_pointer_alignment (arg1) / BITS_PER_UNIT;
- unsigned int arg2_align = get_pointer_alignment (arg2) / BITS_PER_UNIT;
+void
+default_emit_call_builtin___clear_cache (rtx begin, rtx end)
+{
+ rtx callee = gen_rtx_SYMBOL_REF (Pmode,
+ BUILTIN_ASM_NAME_PTR
+ (BUILT_IN_CLEAR_CACHE));
- /* If we don't have POINTER_TYPE, call the function. */
- if (arg1_align == 0 || arg2_align == 0)
- return NULL_RTX;
+ emit_library_call (callee,
+ LCT_NORMAL, VOIDmode,
+ convert_memory_address (ptr_mode, begin), ptr_mode,
+ convert_memory_address (ptr_mode, end), ptr_mode);
+}
- rtx arg1_rtx = get_memory_rtx (arg1, len);
- rtx arg2_rtx = get_memory_rtx (arg2, len);
- rtx len_rtx = expand_normal (fold_convert_loc (loc, sizetype, len));
+/* Emit a call to __builtin___clear_cache, unless the target specifies
+ it as do-nothing. This function can be used by trampoline
+ finalizers to duplicate the effects of expanding a call to the
+ clear_cache builtin. */
- /* Set MEM_SIZE as appropriate. */
- if (CONST_INT_P (len_rtx))
+void
+maybe_emit_call_builtin___clear_cache (rtx begin, rtx end)
+{
+ if ((GET_MODE (begin) != ptr_mode && GET_MODE (begin) != Pmode)
+ || (GET_MODE (end) != ptr_mode && GET_MODE (end) != Pmode))
{
- set_mem_size (arg1_rtx, INTVAL (len_rtx));
- set_mem_size (arg2_rtx, INTVAL (len_rtx));
+ error ("both arguments to %<__builtin___clear_cache%> must be pointers");
+ return;
}
- by_pieces_constfn constfn = NULL;
+ if (targetm.have_clear_cache ())
+ {
+ /* We have a "clear_cache" insn, and it will handle everything. */
+ class expand_operand ops[2];
- /* Try to get the byte representation of the constant ARG2 (or, only
- when the function's result is used for equality to zero, ARG1)
- points to, with its byte size in NBYTES. */
- unsigned HOST_WIDE_INT nbytes;
- const char *rep = getbyterep (arg2, &nbytes);
- if (result_eq && rep == NULL)
+ create_address_operand (&ops[0], begin);
+ create_address_operand (&ops[1], end);
+
+ if (maybe_expand_insn (targetm.code_for_clear_cache, 2, ops))
+ return;
+ }
+ else
{
- /* For equality to zero the arguments are interchangeable. */
- rep = getbyterep (arg1, &nbytes);
- if (rep != NULL)
- std::swap (arg1_rtx, arg2_rtx);
+#ifndef CLEAR_INSN_CACHE
+ /* There is no "clear_cache" insn, and __clear_cache() in libgcc
+ does nothing. There is no need to call it. Do nothing. */
+ return;
+#endif /* CLEAR_INSN_CACHE */
}
- /* If the function's constant bound LEN_RTX is less than or equal
- to the byte size of the representation of the constant argument,
- and if block move would be done by pieces, we can avoid loading
- the bytes from memory and only store the computed constant result. */
- if (rep
- && CONST_INT_P (len_rtx)
- && (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= nbytes)
- constfn = builtin_memcpy_read_str;
+ targetm.calls.emit_call_builtin___clear_cache (begin, end);
+}
- result = emit_block_cmp_hints (arg1_rtx, arg2_rtx, len_rtx,
- TREE_TYPE (len), target,
- result_eq, constfn,
- CONST_CAST (char *, rep));
+/* Expand a call to __builtin___clear_cache. */
- if (result)
+static void
+expand_builtin___clear_cache (tree exp)
+{
+ tree begin, end;
+ rtx begin_rtx, end_rtx;
+
+ /* We must not expand to a library call. If we did, any
+ fallback library function in libgcc that might contain a call to
+ __builtin___clear_cache() would recurse infinitely. */
+ if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
{
- /* Return the value in the proper mode for this function. */
- if (GET_MODE (result) == mode)
- return result;
+ error ("both arguments to %<__builtin___clear_cache%> must be pointers");
+ return;
+ }
- if (target != 0)
- {
- convert_move (target, result, 0);
- return target;
- }
+ begin = CALL_EXPR_ARG (exp, 0);
+ begin_rtx = expand_expr (begin, NULL_RTX, Pmode, EXPAND_NORMAL);
- return convert_to_mode (mode, result, 0);
- }
+ end = CALL_EXPR_ARG (exp, 1);
+ end_rtx = expand_expr (end, NULL_RTX, Pmode, EXPAND_NORMAL);
- return NULL_RTX;
+ maybe_emit_call_builtin___clear_cache (begin_rtx, end_rtx);
}
-/* Expand expression EXP, which is a call to the strcmp builtin. Return NULL_RTX
- if we failed the caller should emit a normal call, otherwise try to get
- the result in TARGET, if convenient. */
+/* Given a trampoline address, make sure it satisfies TRAMPOLINE_ALIGNMENT. */
static rtx
-expand_builtin_strcmp (tree exp, ATTRIBUTE_UNUSED rtx target)
+round_trampoline_addr (rtx tramp)
{
- if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
- return NULL_RTX;
+ rtx temp, addend, mask;
- tree arg1 = CALL_EXPR_ARG (exp, 0);
- tree arg2 = CALL_EXPR_ARG (exp, 1);
+ /* If we don't need too much alignment, we'll have been guaranteed
+ proper alignment by get_trampoline_type. */
+ if (TRAMPOLINE_ALIGNMENT <= STACK_BOUNDARY)
+ return tramp;
- if (!check_read_access (exp, arg1)
- || !check_read_access (exp, arg2))
- return NULL_RTX;
+ /* Round address up to desired boundary. */
+ temp = gen_reg_rtx (Pmode);
+ addend = gen_int_mode (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT - 1, Pmode);
+ mask = gen_int_mode (-TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT, Pmode);
- /* Due to the performance benefit, always inline the calls first. */
- rtx result = NULL_RTX;
- result = inline_expand_builtin_bytecmp (exp, target);
- if (result)
- return result;
+ temp = expand_simple_binop (Pmode, PLUS, tramp, addend,
+ temp, 0, OPTAB_LIB_WIDEN);
+ tramp = expand_simple_binop (Pmode, AND, temp, mask,
+ temp, 0, OPTAB_LIB_WIDEN);
- insn_code cmpstr_icode = direct_optab_handler (cmpstr_optab, SImode);
- insn_code cmpstrn_icode = direct_optab_handler (cmpstrn_optab, SImode);
- if (cmpstr_icode == CODE_FOR_nothing && cmpstrn_icode == CODE_FOR_nothing)
- return NULL_RTX;
+ return tramp;
+}
- unsigned int arg1_align = get_pointer_alignment (arg1) / BITS_PER_UNIT;
- unsigned int arg2_align = get_pointer_alignment (arg2) / BITS_PER_UNIT;
+static rtx
+expand_builtin_init_trampoline (tree exp, bool onstack)
+{
+ tree t_tramp, t_func, t_chain;
+ rtx m_tramp, r_tramp, r_chain, tmp;
- /* If we don't have POINTER_TYPE, call the function. */
- if (arg1_align == 0 || arg2_align == 0)
+ if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE,
+ POINTER_TYPE, VOID_TYPE))
return NULL_RTX;
- /* Stabilize the arguments in case gen_cmpstr(n)si fail. */
- arg1 = builtin_save_expr (arg1);
- arg2 = builtin_save_expr (arg2);
+ t_tramp = CALL_EXPR_ARG (exp, 0);
+ t_func = CALL_EXPR_ARG (exp, 1);
+ t_chain = CALL_EXPR_ARG (exp, 2);
- rtx arg1_rtx = get_memory_rtx (arg1, NULL);
- rtx arg2_rtx = get_memory_rtx (arg2, NULL);
+ r_tramp = expand_normal (t_tramp);
+ m_tramp = gen_rtx_MEM (BLKmode, r_tramp);
+ MEM_NOTRAP_P (m_tramp) = 1;
- /* Try to call cmpstrsi. */
- if (cmpstr_icode != CODE_FOR_nothing)
- result = expand_cmpstr (cmpstr_icode, target, arg1_rtx, arg2_rtx,
- MIN (arg1_align, arg2_align));
+ /* If ONSTACK, the TRAMP argument should be the address of a field
+ within the local function's FRAME decl. Either way, let's see if
+ we can fill in the MEM_ATTRs for this memory. */
+ if (TREE_CODE (t_tramp) == ADDR_EXPR)
+ set_mem_attributes (m_tramp, TREE_OPERAND (t_tramp, 0), true);
- /* Try to determine at least one length and call cmpstrnsi. */
- if (!result && cmpstrn_icode != CODE_FOR_nothing)
+ /* Creator of a heap trampoline is responsible for making sure the
+ address is aligned to at least STACK_BOUNDARY. Normally malloc
+ will ensure this anyhow. */
+ tmp = round_trampoline_addr (r_tramp);
+ if (tmp != r_tramp)
{
- tree len;
- rtx arg3_rtx;
-
- tree len1 = c_strlen (arg1, 1);
- tree len2 = c_strlen (arg2, 1);
-
- if (len1)
- len1 = size_binop (PLUS_EXPR, ssize_int (1), len1);
- if (len2)
- len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);
+ m_tramp = change_address (m_tramp, BLKmode, tmp);
+ set_mem_align (m_tramp, TRAMPOLINE_ALIGNMENT);
+ set_mem_size (m_tramp, TRAMPOLINE_SIZE);
+ }
- /* If we don't have a constant length for the first, use the length
- of the second, if we know it. We don't require a constant for
- this case; some cost analysis could be done if both are available
- but neither is constant. For now, assume they're equally cheap,
- unless one has side effects. If both strings have constant lengths,
- use the smaller. */
+ /* The FUNC argument should be the address of the nested function.
+ Extract the actual function decl to pass to the hook. */
+ gcc_assert (TREE_CODE (t_func) == ADDR_EXPR);
+ t_func = TREE_OPERAND (t_func, 0);
+ gcc_assert (TREE_CODE (t_func) == FUNCTION_DECL);
- if (!len1)
- len = len2;
- else if (!len2)
- len = len1;
- else if (TREE_SIDE_EFFECTS (len1))
- len = len2;
- else if (TREE_SIDE_EFFECTS (len2))
- len = len1;
- else if (TREE_CODE (len1) != INTEGER_CST)
- len = len2;
- else if (TREE_CODE (len2) != INTEGER_CST)
- len = len1;
- else if (tree_int_cst_lt (len1, len2))
- len = len1;
- else
- len = len2;
+ r_chain = expand_normal (t_chain);
- /* If both arguments have side effects, we cannot optimize. */
- if (len && !TREE_SIDE_EFFECTS (len))
- {
- arg3_rtx = expand_normal (len);
- result = expand_cmpstrn_or_cmpmem
- (cmpstrn_icode, target, arg1_rtx, arg2_rtx, TREE_TYPE (len),
- arg3_rtx, MIN (arg1_align, arg2_align));
- }
- }
+ /* Generate insns to initialize the trampoline. */
+ targetm.calls.trampoline_init (m_tramp, t_func, r_chain);
- tree fndecl = get_callee_fndecl (exp);
- if (result)
+ if (onstack)
{
- /* Check to see if the argument was declared attribute nonstring
- and if so, issue a warning since at this point it's not known
- to be nul-terminated. */
- maybe_warn_nonstring_arg (fndecl, exp);
+ trampolines_created = 1;
- /* Return the value in the proper mode for this function. */
- machine_mode mode = TYPE_MODE (TREE_TYPE (exp));
- if (GET_MODE (result) == mode)
- return result;
- if (target == 0)
- return convert_to_mode (mode, result, 0);
- convert_move (target, result, 0);
- return target;
+ if (targetm.calls.custom_function_descriptors != 0)
+ warning_at (DECL_SOURCE_LOCATION (t_func), OPT_Wtrampolines,
+ "trampoline generated for nested function %qD", t_func);
}
- /* Expand the library call ourselves using a stabilized argument
- list to avoid re-evaluating the function's arguments twice. */
- tree fn = build_call_nofold_loc (EXPR_LOCATION (exp), fndecl, 2, arg1, arg2);
- gcc_assert (TREE_CODE (fn) == CALL_EXPR);
- CALL_EXPR_TAILCALL (fn) = CALL_EXPR_TAILCALL (exp);
- return expand_call (fn, target, target == const0_rtx);
+ return const0_rtx;
}
-/* Expand expression EXP, which is a call to the strncmp builtin. Return
- NULL_RTX if we failed the caller should emit a normal call, otherwise
- try to get the result in TARGET, if convenient. */
-
static rtx
-expand_builtin_strncmp (tree exp, ATTRIBUTE_UNUSED rtx target,
- ATTRIBUTE_UNUSED machine_mode mode)
+expand_builtin_adjust_trampoline (tree exp)
{
- if (!validate_arglist (exp,
- POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
- return NULL_RTX;
-
- tree arg1 = CALL_EXPR_ARG (exp, 0);
- tree arg2 = CALL_EXPR_ARG (exp, 1);
- tree arg3 = CALL_EXPR_ARG (exp, 2);
+ rtx tramp;
- if (!check_nul_terminated_array (exp, arg1, arg3)
- || !check_nul_terminated_array (exp, arg2, arg3))
+ if (!validate_arglist (exp, POINTER_TYPE, VOID_TYPE))
return NULL_RTX;
- location_t loc = EXPR_LOCATION (exp);
- tree len1 = c_strlen (arg1, 1);
- tree len2 = c_strlen (arg2, 1);
-
- if (!len1 || !len2)
- {
- /* Check to see if the argument was declared attribute nonstring
- and if so, issue a warning since at this point it's not known
- to be nul-terminated. */
- if (!maybe_warn_nonstring_arg (get_callee_fndecl (exp), exp)
- && !len1 && !len2)
- {
- /* A strncmp read is constrained not just by the bound but
- also by the length of the shorter string. Specifying
- a bound that's larger than the size of either array makes
- no sense and is likely a bug. When the length of neither
- of the two strings is known but the sizes of both of
- the arrays they are stored in is, issue a warning if
- the bound is larger than than the size of the larger
- of the two arrays. */
+ tramp = expand_normal (CALL_EXPR_ARG (exp, 0));
+ tramp = round_trampoline_addr (tramp);
+ if (targetm.calls.trampoline_adjust_address)
+ tramp = targetm.calls.trampoline_adjust_address (tramp);
- access_ref ref1 (arg3, true);
- access_ref ref2 (arg3, true);
+ return tramp;
+}
- tree bndrng[2] = { NULL_TREE, NULL_TREE };
- get_size_range (arg3, bndrng, ref1.bndrng);
+/* Expand a call to the builtin descriptor initialization routine.
+ A descriptor is made up of a couple of pointers to the static
+ chain and the code entry in this order. */
- tree size1 = compute_objsize (arg1, 1, &ref1);
- tree size2 = compute_objsize (arg2, 1, &ref2);
- tree func = get_callee_fndecl (exp);
+static rtx
+expand_builtin_init_descriptor (tree exp)
+{
+ tree t_descr, t_func, t_chain;
+ rtx m_descr, r_descr, r_func, r_chain;
- if (size1 && size2 && bndrng[0] && !integer_zerop (bndrng[0]))
- {
- offset_int rem1 = ref1.size_remaining ();
- offset_int rem2 = ref2.size_remaining ();
- if (rem1 == 0 || rem2 == 0)
- maybe_warn_for_bound (OPT_Wstringop_overread, loc, exp, func,
- bndrng, integer_zero_node);
- else
- {
- offset_int maxrem = wi::max (rem1, rem2, UNSIGNED);
- if (maxrem < wi::to_offset (bndrng[0]))
- maybe_warn_for_bound (OPT_Wstringop_overread, loc, exp,
- func, bndrng,
- wide_int_to_tree (sizetype, maxrem));
- }
- }
- else if (bndrng[0]
- && !integer_zerop (bndrng[0])
- && ((size1 && integer_zerop (size1))
- || (size2 && integer_zerop (size2))))
- maybe_warn_for_bound (OPT_Wstringop_overread, loc, exp, func,
- bndrng, integer_zero_node);
- }
- }
-
- /* Due to the performance benefit, always inline the calls first. */
- rtx result = NULL_RTX;
- result = inline_expand_builtin_bytecmp (exp, target);
- if (result)
- return result;
-
- /* If c_strlen can determine an expression for one of the string
- lengths, and it doesn't have side effects, then emit cmpstrnsi
- using length MIN(strlen(string)+1, arg3). */
- insn_code cmpstrn_icode = direct_optab_handler (cmpstrn_optab, SImode);
- if (cmpstrn_icode == CODE_FOR_nothing)
+ if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, POINTER_TYPE,
+ VOID_TYPE))
return NULL_RTX;
- tree len;
-
- unsigned int arg1_align = get_pointer_alignment (arg1) / BITS_PER_UNIT;
- unsigned int arg2_align = get_pointer_alignment (arg2) / BITS_PER_UNIT;
-
- if (len1)
- len1 = size_binop_loc (loc, PLUS_EXPR, ssize_int (1), len1);
- if (len2)
- len2 = size_binop_loc (loc, PLUS_EXPR, ssize_int (1), len2);
-
- tree len3 = fold_convert_loc (loc, sizetype, arg3);
-
- /* If we don't have a constant length for the first, use the length
- of the second, if we know it. If neither string is constant length,
- use the given length argument. We don't require a constant for
- this case; some cost analysis could be done if both are available
- but neither is constant. For now, assume they're equally cheap,
- unless one has side effects. If both strings have constant lengths,
- use the smaller. */
+ t_descr = CALL_EXPR_ARG (exp, 0);
+ t_func = CALL_EXPR_ARG (exp, 1);
+ t_chain = CALL_EXPR_ARG (exp, 2);
- if (!len1 && !len2)
- len = len3;
- else if (!len1)
- len = len2;
- else if (!len2)
- len = len1;
- else if (TREE_SIDE_EFFECTS (len1))
- len = len2;
- else if (TREE_SIDE_EFFECTS (len2))
- len = len1;
- else if (TREE_CODE (len1) != INTEGER_CST)
- len = len2;
- else if (TREE_CODE (len2) != INTEGER_CST)
- len = len1;
- else if (tree_int_cst_lt (len1, len2))
- len = len1;
- else
- len = len2;
+ r_descr = expand_normal (t_descr);
+ m_descr = gen_rtx_MEM (BLKmode, r_descr);
+ MEM_NOTRAP_P (m_descr) = 1;
+ set_mem_align (m_descr, GET_MODE_ALIGNMENT (ptr_mode));
- /* If we are not using the given length, we must incorporate it here.
- The actual new length parameter will be MIN(len,arg3) in this case. */
- if (len != len3)
- {
- len = fold_convert_loc (loc, sizetype, len);
- len = fold_build2_loc (loc, MIN_EXPR, TREE_TYPE (len), len, len3);
- }
- rtx arg1_rtx = get_memory_rtx (arg1, len);
- rtx arg2_rtx = get_memory_rtx (arg2, len);
- rtx arg3_rtx = expand_normal (len);
- result = expand_cmpstrn_or_cmpmem (cmpstrn_icode, target, arg1_rtx,
- arg2_rtx, TREE_TYPE (len), arg3_rtx,
- MIN (arg1_align, arg2_align));
+ r_func = expand_normal (t_func);
+ r_chain = expand_normal (t_chain);
- tree fndecl = get_callee_fndecl (exp);
- if (result)
- {
- /* Return the value in the proper mode for this function. */
- mode = TYPE_MODE (TREE_TYPE (exp));
- if (GET_MODE (result) == mode)
- return result;
- if (target == 0)
- return convert_to_mode (mode, result, 0);
- convert_move (target, result, 0);
- return target;
- }
+ /* Generate insns to initialize the descriptor. */
+ emit_move_insn (adjust_address_nv (m_descr, ptr_mode, 0), r_chain);
+ emit_move_insn (adjust_address_nv (m_descr, ptr_mode,
+ POINTER_SIZE / BITS_PER_UNIT), r_func);
- /* Expand the library call ourselves using a stabilized argument
- list to avoid re-evaluating the function's arguments twice. */
- tree call = build_call_nofold_loc (loc, fndecl, 3, arg1, arg2, len);
- copy_warning (call, exp);
- gcc_assert (TREE_CODE (call) == CALL_EXPR);
- CALL_EXPR_TAILCALL (call) = CALL_EXPR_TAILCALL (exp);
- return expand_call (call, target, target == const0_rtx);
+ return const0_rtx;
}
-/* Expand a call to __builtin_saveregs, generating the result in TARGET,
- if that's convenient. */
+/* Expand a call to the builtin descriptor adjustment routine. */
-rtx
-expand_builtin_saveregs (void)
+static rtx
+expand_builtin_adjust_descriptor (tree exp)
{
- rtx val;
- rtx_insn *seq;
-
- /* Don't do __builtin_saveregs more than once in a function.
- Save the result of the first call and reuse it. */
- if (saveregs_value != 0)
- return saveregs_value;
-
- /* When this function is called, it means that registers must be
- saved on entry to this function. So we migrate the call to the
- first insn of this function. */
-
- start_sequence ();
-
- /* Do whatever the machine needs done in this case. */
- val = targetm.calls.expand_builtin_saveregs ();
+ rtx tramp;
- seq = get_insns ();
- end_sequence ();
+ if (!validate_arglist (exp, POINTER_TYPE, VOID_TYPE))
+ return NULL_RTX;
- saveregs_value = val;
+ tramp = expand_normal (CALL_EXPR_ARG (exp, 0));
- /* Put the insns after the NOTE that starts the function. If this
- is inside a start_sequence, make the outer-level insn chain current, so
- the code is placed at the start of the function. */
- push_topmost_sequence ();
- emit_insn_after (seq, entry_of_function ());
- pop_topmost_sequence ();
+ /* Unalign the descriptor to allow runtime identification. */
+ tramp = plus_constant (ptr_mode, tramp,
+ targetm.calls.custom_function_descriptors);
- return val;
+ return force_operand (tramp, NULL_RTX);
}
-/* Expand a call to __builtin_next_arg. */
-
+/* Expand the call EXP to the built-in signbit, signbitf or signbitl
+ function. The function first checks whether the back end provides
+ an insn to implement signbit for the respective mode. If not, it
+ checks whether the floating point format of the value is such that
+ the sign bit can be extracted. If that is not the case, error out.
+ EXP is the expression that is a call to the builtin function; if
+ convenient, the result should be placed in TARGET. */
static rtx
-expand_builtin_next_arg (void)
+expand_builtin_signbit (tree exp, rtx target)
{
- /* Checking arguments is already done in fold_builtin_next_arg
- that must be called before this function. */
- return expand_binop (ptr_mode, add_optab,
- crtl->args.internal_arg_pointer,
- crtl->args.arg_offset_rtx,
- NULL_RTX, 0, OPTAB_LIB_WIDEN);
-}
+ const struct real_format *fmt;
+ scalar_float_mode fmode;
+ scalar_int_mode rmode, imode;
+ tree arg;
+ int word, bitpos;
+ enum insn_code icode;
+ rtx temp;
+ location_t loc = EXPR_LOCATION (exp);
-/* Make it easier for the backends by protecting the valist argument
- from multiple evaluations. */
+ if (!validate_arglist (exp, REAL_TYPE, VOID_TYPE))
+ return NULL_RTX;
-static tree
-stabilize_va_list_loc (location_t loc, tree valist, int needs_lvalue)
-{
- tree vatype = targetm.canonical_va_list_type (TREE_TYPE (valist));
+ arg = CALL_EXPR_ARG (exp, 0);
+ fmode = SCALAR_FLOAT_TYPE_MODE (TREE_TYPE (arg));
+ rmode = SCALAR_INT_TYPE_MODE (TREE_TYPE (exp));
+ fmt = REAL_MODE_FORMAT (fmode);
- /* The current way of determining the type of valist is completely
- bogus. We should have the information on the va builtin instead. */
- if (!vatype)
- vatype = targetm.fn_abi_va_list (cfun->decl);
+ arg = builtin_save_expr (arg);
- if (TREE_CODE (vatype) == ARRAY_TYPE)
+ /* Expand the argument yielding a RTX expression. */
+ temp = expand_normal (arg);
+
+ /* Check if the back end provides an insn that handles signbit for the
+ argument's mode. */
+ icode = optab_handler (signbit_optab, fmode);
+ if (icode != CODE_FOR_nothing)
{
- if (TREE_SIDE_EFFECTS (valist))
- valist = save_expr (valist);
+ rtx_insn *last = get_last_insn ();
+ target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
+ if (maybe_emit_unop_insn (icode, target, temp, UNKNOWN))
+ return target;
+ delete_insns_since (last);
+ }
- /* For this case, the backends will be expecting a pointer to
- vatype, but it's possible we've actually been given an array
- (an actual TARGET_CANONICAL_VA_LIST_TYPE (valist)).
- So fix it. */
- if (TREE_CODE (TREE_TYPE (valist)) == ARRAY_TYPE)
- {
- tree p1 = build_pointer_type (TREE_TYPE (vatype));
- valist = build_fold_addr_expr_with_type_loc (loc, valist, p1);
- }
+ /* For floating point formats without a sign bit, implement signbit
+ as "ARG < 0.0". */
+ bitpos = fmt->signbit_ro;
+ if (bitpos < 0)
+ {
+ /* But we can't do this if the format supports signed zero. */
+ gcc_assert (!fmt->has_signed_zero || !HONOR_SIGNED_ZEROS (fmode));
+
+ arg = fold_build2_loc (loc, LT_EXPR, TREE_TYPE (exp), arg,
+ build_real (TREE_TYPE (arg), dconst0));
+ return expand_expr (arg, target, VOIDmode, EXPAND_NORMAL);
+ }
+
+ if (GET_MODE_SIZE (fmode) <= UNITS_PER_WORD)
+ {
+ imode = int_mode_for_mode (fmode).require ();
+ temp = gen_lowpart (imode, temp);
}
else
{
- tree pt = build_pointer_type (vatype);
+ imode = word_mode;
+ /* Handle targets with different FP word orders. */
+ if (FLOAT_WORDS_BIG_ENDIAN)
+ word = (GET_MODE_BITSIZE (fmode) - bitpos) / BITS_PER_WORD;
+ else
+ word = bitpos / BITS_PER_WORD;
+ temp = operand_subword_force (temp, word, fmode);
+ bitpos = bitpos % BITS_PER_WORD;
+ }
- if (! needs_lvalue)
- {
- if (! TREE_SIDE_EFFECTS (valist))
- return valist;
+ /* Force the intermediate word_mode (or narrower) result into a
+ register. This avoids attempting to create paradoxical SUBREGs
+ of floating point modes below. */
+ temp = force_reg (imode, temp);
- valist = fold_build1_loc (loc, ADDR_EXPR, pt, valist);
- TREE_SIDE_EFFECTS (valist) = 1;
- }
+ /* If the bitpos is within the "result mode" lowpart, the operation
+ can be implement with a single bitwise AND. Otherwise, we need
+ a right shift and an AND. */
- if (TREE_SIDE_EFFECTS (valist))
- valist = save_expr (valist);
- valist = fold_build2_loc (loc, MEM_REF,
- vatype, valist, build_int_cst (pt, 0));
+ if (bitpos < GET_MODE_BITSIZE (rmode))
+ {
+ wide_int mask = wi::set_bit_in_zero (bitpos, GET_MODE_PRECISION (rmode));
+
+ if (GET_MODE_SIZE (imode) > GET_MODE_SIZE (rmode))
+ temp = gen_lowpart (rmode, temp);
+ temp = expand_binop (rmode, and_optab, temp,
+ immed_wide_int_const (mask, rmode),
+ NULL_RTX, 1, OPTAB_LIB_WIDEN);
+ }
+ else
+ {
+ /* Perform a logical right shift to place the signbit in the least
+ significant bit, then truncate the result to the desired mode
+ and mask just this bit. */
+ temp = expand_shift (RSHIFT_EXPR, imode, temp, bitpos, NULL_RTX, 1);
+ temp = gen_lowpart (rmode, temp);
+ temp = expand_binop (rmode, and_optab, temp, const1_rtx,
+ NULL_RTX, 1, OPTAB_LIB_WIDEN);
}
- return valist;
+ return temp;
}
-/* The "standard" definition of va_list is void*. */
+/* Expand fork or exec calls. TARGET is the desired target of the
+ call. EXP is the call. FN is the
+ identificator of the actual function. IGNORE is nonzero if the
+ value is to be ignored. */
-tree
-std_build_builtin_va_list (void)
+static rtx
+expand_builtin_fork_or_exec (tree fn, tree exp, rtx target, int ignore)
{
- return ptr_type_node;
-}
+ tree id, decl;
+ tree call;
-/* The "standard" abi va_list is va_list_type_node. */
+ if (DECL_FUNCTION_CODE (fn) != BUILT_IN_FORK)
+ {
+ tree path = CALL_EXPR_ARG (exp, 0);
+ /* Detect unterminated path. */
+ if (!check_read_access (exp, path))
+ return NULL_RTX;
-tree
-std_fn_abi_va_list (tree fndecl ATTRIBUTE_UNUSED)
-{
- return va_list_type_node;
-}
+ /* Also detect unterminated first argument. */
+ switch (DECL_FUNCTION_CODE (fn))
+ {
+ case BUILT_IN_EXECL:
+ case BUILT_IN_EXECLE:
+ case BUILT_IN_EXECLP:
+ if (!check_read_access (exp, path))
+ return NULL_RTX;
+ default:
+ break;
+ }
+ }
-/* The "standard" type of va_list is va_list_type_node. */
-tree
-std_canonical_va_list_type (tree type)
-{
- tree wtype, htype;
+ /* If we are not profiling, just call the function. */
+ if (!profile_arc_flag)
+ return NULL_RTX;
- wtype = va_list_type_node;
- htype = type;
+ /* Otherwise call the wrapper. This should be equivalent for the rest of
+ compiler, so the code does not diverge, and the wrapper may run the
+ code necessary for keeping the profiling sane. */
- if (TREE_CODE (wtype) == ARRAY_TYPE)
+ switch (DECL_FUNCTION_CODE (fn))
{
- /* If va_list is an array type, the argument may have decayed
- to a pointer type, e.g. by being passed to another function.
- In that case, unwrap both types so that we can compare the
- underlying records. */
- if (TREE_CODE (htype) == ARRAY_TYPE
- || POINTER_TYPE_P (htype))
- {
- wtype = TREE_TYPE (wtype);
- htype = TREE_TYPE (htype);
- }
- }
- if (TYPE_MAIN_VARIANT (wtype) == TYPE_MAIN_VARIANT (htype))
- return va_list_type_node;
+ case BUILT_IN_FORK:
+ id = get_identifier ("__gcov_fork");
+ break;
- return NULL_TREE;
-}
+ case BUILT_IN_EXECL:
+ id = get_identifier ("__gcov_execl");
+ break;
-/* The "standard" implementation of va_start: just assign `nextarg' to
- the variable. */
+ case BUILT_IN_EXECV:
+ id = get_identifier ("__gcov_execv");
+ break;
-void
-std_expand_builtin_va_start (tree valist, rtx nextarg)
-{
- rtx va_r = expand_expr (valist, NULL_RTX, VOIDmode, EXPAND_WRITE);
- convert_move (va_r, nextarg, 0);
-}
+ case BUILT_IN_EXECLP:
+ id = get_identifier ("__gcov_execlp");
+ break;
-/* Expand EXP, a call to __builtin_va_start. */
+ case BUILT_IN_EXECLE:
+ id = get_identifier ("__gcov_execle");
+ break;
-static rtx
-expand_builtin_va_start (tree exp)
-{
- rtx nextarg;
- tree valist;
- location_t loc = EXPR_LOCATION (exp);
+ case BUILT_IN_EXECVP:
+ id = get_identifier ("__gcov_execvp");
+ break;
- if (call_expr_nargs (exp) < 2)
- {
- error_at (loc, "too few arguments to function %<va_start%>");
- return const0_rtx;
- }
+ case BUILT_IN_EXECVE:
+ id = get_identifier ("__gcov_execve");
+ break;
- if (fold_builtin_next_arg (exp, true))
- return const0_rtx;
+ default:
+ gcc_unreachable ();
+ }
- nextarg = expand_builtin_next_arg ();
- valist = stabilize_va_list_loc (loc, CALL_EXPR_ARG (exp, 0), 1);
+ decl = build_decl (DECL_SOURCE_LOCATION (fn),
+ FUNCTION_DECL, id, TREE_TYPE (fn));
+ DECL_EXTERNAL (decl) = 1;
+ TREE_PUBLIC (decl) = 1;
+ DECL_ARTIFICIAL (decl) = 1;
+ TREE_NOTHROW (decl) = 1;
+ DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
+ DECL_VISIBILITY_SPECIFIED (decl) = 1;
+ call = rewrite_call_expr (EXPR_LOCATION (exp), exp, 0, decl, 0);
+ return expand_call (call, target, ignore);
+ }
- if (targetm.expand_builtin_va_start)
- targetm.expand_builtin_va_start (valist, nextarg);
- else
- std_expand_builtin_va_start (valist, nextarg);
- return const0_rtx;
-}
+\f
+/* Reconstitute a mode for a __sync intrinsic operation. Since the type of
+ the pointer in these functions is void*, the tree optimizers may remove
+ casts. The mode computed in expand_builtin isn't reliable either, due
+ to __sync_bool_compare_and_swap.
-/* Expand EXP, a call to __builtin_va_end. */
+ FCODE_DIFF should be fcode - base, where base is the FOO_1 code for the
+ group of builtins. This gives us log2 of the mode size. */
-static rtx
-expand_builtin_va_end (tree exp)
+static inline machine_mode
+get_builtin_sync_mode (int fcode_diff)
{
- tree valist = CALL_EXPR_ARG (exp, 0);
-
- /* Evaluate for side effects, if needed. I hate macros that don't
- do that. */
- if (TREE_SIDE_EFFECTS (valist))
- expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);
-
- return const0_rtx;
+ /* The size is not negotiable, so ask not to get BLKmode in return
+ if the target indicates that a smaller size would be better. */
+ return int_mode_for_size (BITS_PER_UNIT << fcode_diff, 0).require ();
}
-/* Expand EXP, a call to __builtin_va_copy. We do this as a
- builtin rather than just as an assignment in stdarg.h because of the
- nastiness of array-type va_list types. */
+/* Expand the memory expression LOC and return the appropriate memory operand
+ for the builtin_sync operations. */
static rtx
-expand_builtin_va_copy (tree exp)
+get_builtin_sync_mem (tree loc, machine_mode mode)
{
- tree dst, src, t;
- location_t loc = EXPR_LOCATION (exp);
+ rtx addr, mem;
+ int addr_space = TYPE_ADDR_SPACE (POINTER_TYPE_P (TREE_TYPE (loc))
+ ? TREE_TYPE (TREE_TYPE (loc))
+ : TREE_TYPE (loc));
+ scalar_int_mode addr_mode = targetm.addr_space.address_mode (addr_space);
- dst = CALL_EXPR_ARG (exp, 0);
- src = CALL_EXPR_ARG (exp, 1);
+ addr = expand_expr (loc, NULL_RTX, addr_mode, EXPAND_SUM);
+ addr = convert_memory_address (addr_mode, addr);
- dst = stabilize_va_list_loc (loc, dst, 1);
- src = stabilize_va_list_loc (loc, src, 0);
+ /* Note that we explicitly do not want any alias information for this
+ memory, so that we kill all other live memories. Otherwise we don't
+ satisfy the full barrier semantics of the intrinsic. */
+ mem = gen_rtx_MEM (mode, addr);
- gcc_assert (cfun != NULL && cfun->decl != NULL_TREE);
+ set_mem_addr_space (mem, addr_space);
- if (TREE_CODE (targetm.fn_abi_va_list (cfun->decl)) != ARRAY_TYPE)
- {
- t = build2 (MODIFY_EXPR, targetm.fn_abi_va_list (cfun->decl), dst, src);
- TREE_SIDE_EFFECTS (t) = 1;
- expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
- }
- else
- {
- rtx dstb, srcb, size;
+ mem = validize_mem (mem);
- /* Evaluate to pointers. */
- dstb = expand_expr (dst, NULL_RTX, Pmode, EXPAND_NORMAL);
- srcb = expand_expr (src, NULL_RTX, Pmode, EXPAND_NORMAL);
- size = expand_expr (TYPE_SIZE_UNIT (targetm.fn_abi_va_list (cfun->decl)),
- NULL_RTX, VOIDmode, EXPAND_NORMAL);
+ /* The alignment needs to be at least according to that of the mode. */
+ set_mem_align (mem, MAX (GET_MODE_ALIGNMENT (mode),
+ get_pointer_alignment (loc)));
+ set_mem_alias_set (mem, ALIAS_SET_MEMORY_BARRIER);
+ MEM_VOLATILE_P (mem) = 1;
- dstb = convert_memory_address (Pmode, dstb);
- srcb = convert_memory_address (Pmode, srcb);
+ return mem;
+}
- /* "Dereference" to BLKmode memories. */
- dstb = gen_rtx_MEM (BLKmode, dstb);
- set_mem_alias_set (dstb, get_alias_set (TREE_TYPE (TREE_TYPE (dst))));
- set_mem_align (dstb, TYPE_ALIGN (targetm.fn_abi_va_list (cfun->decl)));
- srcb = gen_rtx_MEM (BLKmode, srcb);
- set_mem_alias_set (srcb, get_alias_set (TREE_TYPE (TREE_TYPE (src))));
- set_mem_align (srcb, TYPE_ALIGN (targetm.fn_abi_va_list (cfun->decl)));
+/* Make sure an argument is in the right mode.
+ EXP is the tree argument.
+ MODE is the mode it should be in. */
- /* Copy. */
- emit_block_move (dstb, srcb, size, BLOCK_OP_NORMAL);
+static rtx
+expand_expr_force_mode (tree exp, machine_mode mode)
+{
+ rtx val;
+ machine_mode old_mode;
+
+ if (TREE_CODE (exp) == SSA_NAME
+ && TYPE_MODE (TREE_TYPE (exp)) != mode)
+ {
+ /* Undo argument promotion if possible, as combine might not
+ be able to do it later due to MEM_VOLATILE_P uses in the
+ patterns. */
+ gimple *g = get_gimple_for_ssa_name (exp);
+ if (g && gimple_assign_cast_p (g))
+ {
+ tree rhs = gimple_assign_rhs1 (g);
+ tree_code code = gimple_assign_rhs_code (g);
+ if (CONVERT_EXPR_CODE_P (code)
+ && TYPE_MODE (TREE_TYPE (rhs)) == mode
+ && INTEGRAL_TYPE_P (TREE_TYPE (exp))
+ && INTEGRAL_TYPE_P (TREE_TYPE (rhs))
+ && (TYPE_PRECISION (TREE_TYPE (exp))
+ > TYPE_PRECISION (TREE_TYPE (rhs))))
+ exp = rhs;
+ }
}
- return const0_rtx;
+ val = expand_expr (exp, NULL_RTX, mode, EXPAND_NORMAL);
+ /* If VAL is promoted to a wider mode, convert it back to MODE. Take care
+ of CONST_INTs, where we know the old_mode only from the call argument. */
+
+ old_mode = GET_MODE (val);
+ if (old_mode == VOIDmode)
+ old_mode = TYPE_MODE (TREE_TYPE (exp));
+ val = convert_modes (mode, old_mode, val, 1);
+ return val;
}
-/* Expand a call to one of the builtin functions __builtin_frame_address or
- __builtin_return_address. */
+
+/* Expand the __sync_xxx_and_fetch and __sync_fetch_and_xxx intrinsics.
+ EXP is the CALL_EXPR. CODE is the rtx code
+ that corresponds to the arithmetic or logical operation from the name;
+ an exception here is that NOT actually means NAND. TARGET is an optional
+ place for us to store the results; AFTER is true if this is the
+ fetch_and_xxx form. */
static rtx
-expand_builtin_frame_address (tree fndecl, tree exp)
+expand_builtin_sync_operation (machine_mode mode, tree exp,
+ enum rtx_code code, bool after,
+ rtx target)
{
- /* The argument must be a nonnegative integer constant.
- It counts the number of frames to scan up the stack.
- The value is either the frame pointer value or the return
- address saved in that frame. */
- if (call_expr_nargs (exp) == 0)
- /* Warning about missing arg was already issued. */
- return const0_rtx;
- else if (! tree_fits_uhwi_p (CALL_EXPR_ARG (exp, 0)))
- {
- error ("invalid argument to %qD", fndecl);
- return const0_rtx;
- }
- else
+ rtx val, mem;
+ location_t loc = EXPR_LOCATION (exp);
+
+ if (code == NOT && warn_sync_nand)
{
- /* Number of frames to scan up the stack. */
- unsigned HOST_WIDE_INT count = tree_to_uhwi (CALL_EXPR_ARG (exp, 0));
+ tree fndecl = get_callee_fndecl (exp);
+ enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
- rtx tem = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl), count);
+ static bool warned_f_a_n, warned_n_a_f;
- /* Some ports cannot access arbitrary stack frames. */
- if (tem == NULL)
+ switch (fcode)
{
- warning (0, "unsupported argument to %qD", fndecl);
- return const0_rtx;
- }
+ case BUILT_IN_SYNC_FETCH_AND_NAND_1:
+ case BUILT_IN_SYNC_FETCH_AND_NAND_2:
+ case BUILT_IN_SYNC_FETCH_AND_NAND_4:
+ case BUILT_IN_SYNC_FETCH_AND_NAND_8:
+ case BUILT_IN_SYNC_FETCH_AND_NAND_16:
+ if (warned_f_a_n)
+ break;
- if (count)
- {
- /* Warn since no effort is made to ensure that any frame
- beyond the current one exists or can be safely reached. */
- warning (OPT_Wframe_address, "calling %qD with "
- "a nonzero argument is unsafe", fndecl);
- }
+ fndecl = builtin_decl_implicit (BUILT_IN_SYNC_FETCH_AND_NAND_N);
+ inform (loc, "%qD changed semantics in GCC 4.4", fndecl);
+ warned_f_a_n = true;
+ break;
- /* For __builtin_frame_address, return what we've got. */
- if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
- return tem;
+ case BUILT_IN_SYNC_NAND_AND_FETCH_1:
+ case BUILT_IN_SYNC_NAND_AND_FETCH_2:
+ case BUILT_IN_SYNC_NAND_AND_FETCH_4:
+ case BUILT_IN_SYNC_NAND_AND_FETCH_8:
+ case BUILT_IN_SYNC_NAND_AND_FETCH_16:
+ if (warned_n_a_f)
+ break;
- if (!REG_P (tem)
- && ! CONSTANT_P (tem))
- tem = copy_addr_to_reg (tem);
- return tem;
+ fndecl = builtin_decl_implicit (BUILT_IN_SYNC_NAND_AND_FETCH_N);
+ inform (loc, "%qD changed semantics in GCC 4.4", fndecl);
+ warned_n_a_f = true;
+ break;
+
+ default:
+ gcc_unreachable ();
+ }
}
+
+ /* Expand the operands. */
+ mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
+ val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);
+
+ return expand_atomic_fetch_op (target, mem, val, code, MEMMODEL_SYNC_SEQ_CST,
+ after);
}
-/* Expand EXP, a call to the alloca builtin. Return NULL_RTX if we
- failed and the caller should emit a normal call. */
+/* Expand the __sync_val_compare_and_swap and __sync_bool_compare_and_swap
+ intrinsics. EXP is the CALL_EXPR. IS_BOOL is
+ true if this is the boolean form. TARGET is a place for us to store the
+ results; this is NOT optional if IS_BOOL is true. */
static rtx
-expand_builtin_alloca (tree exp)
+expand_builtin_compare_and_swap (machine_mode mode, tree exp,
+ bool is_bool, rtx target)
{
- rtx op0;
- rtx result;
- unsigned int align;
- tree fndecl = get_callee_fndecl (exp);
- HOST_WIDE_INT max_size;
- enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
- bool alloca_for_var = CALL_ALLOCA_FOR_VAR_P (exp);
- bool valid_arglist
- = (fcode == BUILT_IN_ALLOCA_WITH_ALIGN_AND_MAX
- ? validate_arglist (exp, INTEGER_TYPE, INTEGER_TYPE, INTEGER_TYPE,
- VOID_TYPE)
- : fcode == BUILT_IN_ALLOCA_WITH_ALIGN
- ? validate_arglist (exp, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE)
- : validate_arglist (exp, INTEGER_TYPE, VOID_TYPE));
+ rtx old_val, new_val, mem;
+ rtx *pbool, *poval;
- if (!valid_arglist)
- return NULL_RTX;
+ /* Expand the operands. */
+ mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
+ old_val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);
+ new_val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 2), mode);
- if ((alloca_for_var
- && warn_vla_limit >= HOST_WIDE_INT_MAX
- && warn_alloc_size_limit < warn_vla_limit)
- || (!alloca_for_var
- && warn_alloca_limit >= HOST_WIDE_INT_MAX
- && warn_alloc_size_limit < warn_alloca_limit
- ))
+ pbool = poval = NULL;
+ if (target != const0_rtx)
{
- /* -Walloca-larger-than and -Wvla-larger-than settings of
- less than HOST_WIDE_INT_MAX override the more general
- -Walloc-size-larger-than so unless either of the former
- options is smaller than the last one (wchich would imply
- that the call was already checked), check the alloca
- arguments for overflow. */
- tree args[] = { CALL_EXPR_ARG (exp, 0), NULL_TREE };
- int idx[] = { 0, -1 };
- maybe_warn_alloc_args_overflow (fndecl, exp, args, idx);
+ if (is_bool)
+ pbool = ⌖
+ else
+ poval = ⌖
}
+ if (!expand_atomic_compare_and_swap (pbool, poval, mem, old_val, new_val,
+ false, MEMMODEL_SYNC_SEQ_CST,
+ MEMMODEL_SYNC_SEQ_CST))
+ return NULL_RTX;
- /* Compute the argument. */
- op0 = expand_normal (CALL_EXPR_ARG (exp, 0));
-
- /* Compute the alignment. */
- align = (fcode == BUILT_IN_ALLOCA
- ? BIGGEST_ALIGNMENT
- : TREE_INT_CST_LOW (CALL_EXPR_ARG (exp, 1)));
-
- /* Compute the maximum size. */
- max_size = (fcode == BUILT_IN_ALLOCA_WITH_ALIGN_AND_MAX
- ? TREE_INT_CST_LOW (CALL_EXPR_ARG (exp, 2))
- : -1);
-
- /* Allocate the desired space. If the allocation stems from the declaration
- of a variable-sized object, it cannot accumulate. */
- result
- = allocate_dynamic_stack_space (op0, 0, align, max_size, alloca_for_var);
- result = convert_memory_address (ptr_mode, result);
-
- /* Dynamic allocations for variables are recorded during gimplification. */
- if (!alloca_for_var && (flag_callgraph_info & CALLGRAPH_INFO_DYNAMIC_ALLOC))
- record_dynamic_alloc (exp);
-
- return result;
+ return target;
}
-/* Emit a call to __asan_allocas_unpoison call in EXP. Add to second argument
- of the call virtual_stack_dynamic_rtx - stack_pointer_rtx, which is the
- STACK_DYNAMIC_OFFSET value. See motivation for this in comment to
- handle_builtin_stack_restore function. */
+/* Expand the __sync_lock_test_and_set intrinsic. Note that the most
+ general form is actually an atomic exchange, and some targets only
+ support a reduced form with the second argument being a constant 1.
+ EXP is the CALL_EXPR; TARGET is an optional place for us to store
+ the results. */
static rtx
-expand_asan_emit_allocas_unpoison (tree exp)
+expand_builtin_sync_lock_test_and_set (machine_mode mode, tree exp,
+ rtx target)
{
- tree arg0 = CALL_EXPR_ARG (exp, 0);
- tree arg1 = CALL_EXPR_ARG (exp, 1);
- rtx top = expand_expr (arg0, NULL_RTX, ptr_mode, EXPAND_NORMAL);
- rtx bot = expand_expr (arg1, NULL_RTX, ptr_mode, EXPAND_NORMAL);
- rtx off = expand_simple_binop (Pmode, MINUS, virtual_stack_dynamic_rtx,
- stack_pointer_rtx, NULL_RTX, 0,
- OPTAB_LIB_WIDEN);
- off = convert_modes (ptr_mode, Pmode, off, 0);
- bot = expand_simple_binop (ptr_mode, PLUS, bot, off, NULL_RTX, 0,
- OPTAB_LIB_WIDEN);
- rtx ret = init_one_libfunc ("__asan_allocas_unpoison");
- ret = emit_library_call_value (ret, NULL_RTX, LCT_NORMAL, ptr_mode,
- top, ptr_mode, bot, ptr_mode);
- return ret;
+ rtx val, mem;
+
+ /* Expand the operands. */
+ mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
+ val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);
+
+ return expand_sync_lock_test_and_set (target, mem, val);
}
-/* Expand a call to bswap builtin in EXP.
- Return NULL_RTX if a normal call should be emitted rather than expanding the
- function in-line. If convenient, the result should be placed in TARGET.
- SUBTARGET may be used as the target for computing one of EXP's operands. */
+/* Expand the __sync_lock_release intrinsic. EXP is the CALL_EXPR. */
-static rtx
-expand_builtin_bswap (machine_mode target_mode, tree exp, rtx target,
- rtx subtarget)
+static void
+expand_builtin_sync_lock_release (machine_mode mode, tree exp)
{
- tree arg;
- rtx op0;
+ rtx mem;
- if (!validate_arglist (exp, INTEGER_TYPE, VOID_TYPE))
- return NULL_RTX;
+ /* Expand the operands. */
+ mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
- arg = CALL_EXPR_ARG (exp, 0);
- op0 = expand_expr (arg,
- subtarget && GET_MODE (subtarget) == target_mode
- ? subtarget : NULL_RTX,
- target_mode, EXPAND_NORMAL);
- if (GET_MODE (op0) != target_mode)
- op0 = convert_to_mode (target_mode, op0, 1);
-
- target = expand_unop (target_mode, bswap_optab, op0, target, 1);
-
- gcc_assert (target);
-
- return convert_to_mode (target_mode, target, 1);
+ expand_atomic_store (mem, const0_rtx, MEMMODEL_SYNC_RELEASE, true);
}
-/* Expand a call to a unary builtin in EXP.
- Return NULL_RTX if a normal call should be emitted rather than expanding the
- function in-line. If convenient, the result should be placed in TARGET.
- SUBTARGET may be used as the target for computing one of EXP's operands. */
+/* Given an integer representing an ``enum memmodel'', verify its
+ correctness and return the memory model enum. */
-static rtx
-expand_builtin_unop (machine_mode target_mode, tree exp, rtx target,
- rtx subtarget, optab op_optab)
+static enum memmodel
+get_memmodel (tree exp)
{
- rtx op0;
-
- if (!validate_arglist (exp, INTEGER_TYPE, VOID_TYPE))
- return NULL_RTX;
+ rtx op;
+ unsigned HOST_WIDE_INT val;
+ location_t loc
+ = expansion_point_location_if_in_system_header (input_location);
- /* Compute the argument. */
- op0 = expand_expr (CALL_EXPR_ARG (exp, 0),
- (subtarget
- && (TYPE_MODE (TREE_TYPE (CALL_EXPR_ARG (exp, 0)))
- == GET_MODE (subtarget))) ? subtarget : NULL_RTX,
- VOIDmode, EXPAND_NORMAL);
- /* Compute op, into TARGET if possible.
- Set TARGET to wherever the result comes back. */
- target = expand_unop (TYPE_MODE (TREE_TYPE (CALL_EXPR_ARG (exp, 0))),
- op_optab, op0, target, op_optab != clrsb_optab);
- gcc_assert (target);
+ /* If the parameter is not a constant, it's a run time value so we'll just
+ convert it to MEMMODEL_SEQ_CST to avoid annoying runtime checking. */
+ if (TREE_CODE (exp) != INTEGER_CST)
+ return MEMMODEL_SEQ_CST;
- return convert_to_mode (target_mode, target, 0);
-}
+ op = expand_normal (exp);
-/* Expand a call to __builtin_expect. We just return our argument
- as the builtin_expect semantic should've been already executed by
- tree branch prediction pass. */
+ val = INTVAL (op);
+ if (targetm.memmodel_check)
+ val = targetm.memmodel_check (val);
+ else if (val & ~MEMMODEL_MASK)
+ {
+ warning_at (loc, OPT_Winvalid_memory_model,
+ "unknown architecture specifier in memory model to builtin");
+ return MEMMODEL_SEQ_CST;
+ }
-static rtx
-expand_builtin_expect (tree exp, rtx target)
-{
- tree arg;
+ /* Should never see a user explicit SYNC memodel model, so >= LAST works. */
+ if (memmodel_base (val) >= MEMMODEL_LAST)
+ {
+ warning_at (loc, OPT_Winvalid_memory_model,
+ "invalid memory model argument to builtin");
+ return MEMMODEL_SEQ_CST;
+ }
- if (call_expr_nargs (exp) < 2)
- return const0_rtx;
- arg = CALL_EXPR_ARG (exp, 0);
+ /* Workaround for Bugzilla 59448. GCC doesn't track consume properly, so
+ be conservative and promote consume to acquire. */
+ if (val == MEMMODEL_CONSUME)
+ val = MEMMODEL_ACQUIRE;
- target = expand_expr (arg, target, VOIDmode, EXPAND_NORMAL);
- /* When guessing was done, the hints should be already stripped away. */
- gcc_assert (!flag_guess_branch_prob
- || optimize == 0 || seen_error ());
- return target;
+ return (enum memmodel) val;
}
-/* Expand a call to __builtin_expect_with_probability. We just return our
- argument as the builtin_expect semantic should've been already executed by
- tree branch prediction pass. */
+/* Expand the __atomic_exchange intrinsic:
+ TYPE __atomic_exchange (TYPE *object, TYPE desired, enum memmodel)
+ EXP is the CALL_EXPR.
+ TARGET is an optional place for us to store the results. */
static rtx
-expand_builtin_expect_with_probability (tree exp, rtx target)
+expand_builtin_atomic_exchange (machine_mode mode, tree exp, rtx target)
{
- tree arg;
+ rtx val, mem;
+ enum memmodel model;
- if (call_expr_nargs (exp) < 3)
- return const0_rtx;
- arg = CALL_EXPR_ARG (exp, 0);
+ model = get_memmodel (CALL_EXPR_ARG (exp, 2));
- target = expand_expr (arg, target, VOIDmode, EXPAND_NORMAL);
- /* When guessing was done, the hints should be already stripped away. */
- gcc_assert (!flag_guess_branch_prob
- || optimize == 0 || seen_error ());
- return target;
-}
+ if (!flag_inline_atomics)
+ return NULL_RTX;
+
+ /* Expand the operands. */
+ mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
+ val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);
+ return expand_atomic_exchange (target, mem, val, model);
+}
-/* Expand a call to __builtin_assume_aligned. We just return our first
- argument as the builtin_assume_aligned semantic should've been already
- executed by CCP. */
+/* Expand the __atomic_compare_exchange intrinsic:
+ bool __atomic_compare_exchange (TYPE *object, TYPE *expect,
+ TYPE desired, BOOL weak,
+ enum memmodel success,
+ enum memmodel failure)
+ EXP is the CALL_EXPR.
+ TARGET is an optional place for us to store the results. */
static rtx
-expand_builtin_assume_aligned (tree exp, rtx target)
+expand_builtin_atomic_compare_exchange (machine_mode mode, tree exp,
+ rtx target)
{
- if (call_expr_nargs (exp) < 2)
- return const0_rtx;
- target = expand_expr (CALL_EXPR_ARG (exp, 0), target, VOIDmode,
- EXPAND_NORMAL);
- gcc_assert (!TREE_SIDE_EFFECTS (CALL_EXPR_ARG (exp, 1))
- && (call_expr_nargs (exp) < 3
- || !TREE_SIDE_EFFECTS (CALL_EXPR_ARG (exp, 2))));
- return target;
-}
+ rtx expect, desired, mem, oldval;
+ rtx_code_label *label;
+ enum memmodel success, failure;
+ tree weak;
+ bool is_weak;
+ location_t loc
+ = expansion_point_location_if_in_system_header (input_location);
-void
-expand_builtin_trap (void)
-{
- if (targetm.have_trap ())
+ success = get_memmodel (CALL_EXPR_ARG (exp, 4));
+ failure = get_memmodel (CALL_EXPR_ARG (exp, 5));
+
+ if (failure > success)
{
- rtx_insn *insn = emit_insn (targetm.gen_trap ());
- /* For trap insns when not accumulating outgoing args force
- REG_ARGS_SIZE note to prevent crossjumping of calls with
- different args sizes. */
- if (!ACCUMULATE_OUTGOING_ARGS)
- add_args_size_note (insn, stack_pointer_delta);
+ warning_at (loc, OPT_Winvalid_memory_model,
+ "failure memory model cannot be stronger than success "
+ "memory model for %<__atomic_compare_exchange%>");
+ success = MEMMODEL_SEQ_CST;
}
- else
+
+ if (is_mm_release (failure) || is_mm_acq_rel (failure))
{
- tree fn = builtin_decl_implicit (BUILT_IN_ABORT);
- tree call_expr = build_call_expr (fn, 0);
- expand_call (call_expr, NULL_RTX, false);
+ warning_at (loc, OPT_Winvalid_memory_model,
+ "invalid failure memory model for "
+ "%<__atomic_compare_exchange%>");
+ failure = MEMMODEL_SEQ_CST;
+ success = MEMMODEL_SEQ_CST;
}
- emit_barrier ();
-}
+
+ if (!flag_inline_atomics)
+ return NULL_RTX;
-/* Expand a call to __builtin_unreachable. We do nothing except emit
- a barrier saying that control flow will not pass here.
+ /* Expand the operands. */
+ mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
- It is the responsibility of the program being compiled to ensure
- that control flow does never reach __builtin_unreachable. */
-static void
-expand_builtin_unreachable (void)
-{
- emit_barrier ();
-}
+ expect = expand_normal (CALL_EXPR_ARG (exp, 1));
+ expect = convert_memory_address (Pmode, expect);
+ expect = gen_rtx_MEM (mode, expect);
+ desired = expand_expr_force_mode (CALL_EXPR_ARG (exp, 2), mode);
-/* Expand EXP, a call to fabs, fabsf or fabsl.
- Return NULL_RTX if a normal call should be emitted rather than expanding
- the function inline. If convenient, the result should be placed
- in TARGET. SUBTARGET may be used as the target for computing
- the operand. */
+ weak = CALL_EXPR_ARG (exp, 3);
+ is_weak = false;
+ if (tree_fits_shwi_p (weak) && tree_to_shwi (weak) != 0)
+ is_weak = true;
-static rtx
-expand_builtin_fabs (tree exp, rtx target, rtx subtarget)
-{
- machine_mode mode;
- tree arg;
- rtx op0;
+ if (target == const0_rtx)
+ target = NULL;
- if (!validate_arglist (exp, REAL_TYPE, VOID_TYPE))
+ /* Lest the rtl backend create a race condition with an imporoper store
+ to memory, always create a new pseudo for OLDVAL. */
+ oldval = NULL;
+
+ if (!expand_atomic_compare_and_swap (&target, &oldval, mem, expect, desired,
+ is_weak, success, failure))
return NULL_RTX;
- arg = CALL_EXPR_ARG (exp, 0);
- CALL_EXPR_ARG (exp, 0) = arg = builtin_save_expr (arg);
- mode = TYPE_MODE (TREE_TYPE (arg));
- op0 = expand_expr (arg, subtarget, VOIDmode, EXPAND_NORMAL);
- return expand_abs (mode, op0, target, 0, safe_from_p (target, arg, 1));
+ /* Conditionally store back to EXPECT, lest we create a race condition
+ with an improper store to memory. */
+ /* ??? With a rearrangement of atomics at the gimple level, we can handle
+ the normal case where EXPECT is totally private, i.e. a register. At
+ which point the store can be unconditional. */
+ label = gen_label_rtx ();
+ emit_cmp_and_jump_insns (target, const0_rtx, NE, NULL,
+ GET_MODE (target), 1, label);
+ emit_move_insn (expect, oldval);
+ emit_label (label);
+
+ return target;
}
-/* Expand EXP, a call to copysign, copysignf, or copysignl.
- Return NULL is a normal call should be emitted rather than expanding the
- function inline. If convenient, the result should be placed in TARGET.
- SUBTARGET may be used as the target for computing the operand. */
+/* Helper function for expand_ifn_atomic_compare_exchange - expand
+ internal ATOMIC_COMPARE_EXCHANGE call into __atomic_compare_exchange_N
+ call. The weak parameter must be dropped to match the expected parameter
+ list and the expected argument changed from value to pointer to memory
+ slot. */
-static rtx
-expand_builtin_copysign (tree exp, rtx target, rtx subtarget)
+static void
+expand_ifn_atomic_compare_exchange_into_call (gcall *call, machine_mode mode)
{
- rtx op0, op1;
- tree arg;
-
- if (!validate_arglist (exp, REAL_TYPE, REAL_TYPE, VOID_TYPE))
- return NULL_RTX;
+ unsigned int z;
+ vec<tree, va_gc> *vec;
- arg = CALL_EXPR_ARG (exp, 0);
- op0 = expand_expr (arg, subtarget, VOIDmode, EXPAND_NORMAL);
-
- arg = CALL_EXPR_ARG (exp, 1);
- op1 = expand_normal (arg);
-
- return expand_copysign (op0, op1, target);
+ vec_alloc (vec, 5);
+ vec->quick_push (gimple_call_arg (call, 0));
+ tree expected = gimple_call_arg (call, 1);
+ rtx x = assign_stack_temp_for_type (mode, GET_MODE_SIZE (mode),
+ TREE_TYPE (expected));
+ rtx expd = expand_expr (expected, x, mode, EXPAND_NORMAL);
+ if (expd != x)
+ emit_move_insn (x, expd);
+ tree v = make_tree (TREE_TYPE (expected), x);
+ vec->quick_push (build1 (ADDR_EXPR,
+ build_pointer_type (TREE_TYPE (expected)), v));
+ vec->quick_push (gimple_call_arg (call, 2));
+ /* Skip the boolean weak parameter. */
+ for (z = 4; z < 6; z++)
+ vec->quick_push (gimple_call_arg (call, z));
+ /* At present we only have BUILT_IN_ATOMIC_COMPARE_EXCHANGE_{1,2,4,8,16}. */
+ unsigned int bytes_log2 = exact_log2 (GET_MODE_SIZE (mode).to_constant ());
+ gcc_assert (bytes_log2 < 5);
+ built_in_function fncode
+ = (built_in_function) ((int) BUILT_IN_ATOMIC_COMPARE_EXCHANGE_1
+ + bytes_log2);
+ tree fndecl = builtin_decl_explicit (fncode);
+ tree fn = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fndecl)),
+ fndecl);
+ tree exp = build_call_vec (boolean_type_node, fn, vec);
+ tree lhs = gimple_call_lhs (call);
+ rtx boolret = expand_call (exp, NULL_RTX, lhs == NULL_TREE);
+ if (lhs)
+ {
+ rtx target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
+ if (GET_MODE (boolret) != mode)
+ boolret = convert_modes (mode, GET_MODE (boolret), boolret, 1);
+ x = force_reg (mode, x);
+ write_complex_part (target, boolret, true);
+ write_complex_part (target, x, false);
+ }
}
-/* Emit a call to __builtin___clear_cache. */
+/* Expand IFN_ATOMIC_COMPARE_EXCHANGE internal function. */
void
-default_emit_call_builtin___clear_cache (rtx begin, rtx end)
+expand_ifn_atomic_compare_exchange (gcall *call)
{
- rtx callee = gen_rtx_SYMBOL_REF (Pmode,
- BUILTIN_ASM_NAME_PTR
- (BUILT_IN_CLEAR_CACHE));
+ int size = tree_to_shwi (gimple_call_arg (call, 3)) & 255;
+ gcc_assert (size == 1 || size == 2 || size == 4 || size == 8 || size == 16);
+ machine_mode mode = int_mode_for_size (BITS_PER_UNIT * size, 0).require ();
+ rtx expect, desired, mem, oldval, boolret;
+ enum memmodel success, failure;
+ tree lhs;
+ bool is_weak;
+ location_t loc
+ = expansion_point_location_if_in_system_header (gimple_location (call));
- emit_library_call (callee,
- LCT_NORMAL, VOIDmode,
- convert_memory_address (ptr_mode, begin), ptr_mode,
- convert_memory_address (ptr_mode, end), ptr_mode);
-}
+ success = get_memmodel (gimple_call_arg (call, 4));
+ failure = get_memmodel (gimple_call_arg (call, 5));
-/* Emit a call to __builtin___clear_cache, unless the target specifies
- it as do-nothing. This function can be used by trampoline
- finalizers to duplicate the effects of expanding a call to the
- clear_cache builtin. */
+ if (failure > success)
+ {
+ warning_at (loc, OPT_Winvalid_memory_model,
+ "failure memory model cannot be stronger than success "
+ "memory model for %<__atomic_compare_exchange%>");
+ success = MEMMODEL_SEQ_CST;
+ }
-void
-maybe_emit_call_builtin___clear_cache (rtx begin, rtx end)
-{
- if ((GET_MODE (begin) != ptr_mode && GET_MODE (begin) != Pmode)
- || (GET_MODE (end) != ptr_mode && GET_MODE (end) != Pmode))
+ if (is_mm_release (failure) || is_mm_acq_rel (failure))
{
- error ("both arguments to %<__builtin___clear_cache%> must be pointers");
- return;
+ warning_at (loc, OPT_Winvalid_memory_model,
+ "invalid failure memory model for "
+ "%<__atomic_compare_exchange%>");
+ failure = MEMMODEL_SEQ_CST;
+ success = MEMMODEL_SEQ_CST;
}
- if (targetm.have_clear_cache ())
+ if (!flag_inline_atomics)
{
- /* We have a "clear_cache" insn, and it will handle everything. */
- class expand_operand ops[2];
+ expand_ifn_atomic_compare_exchange_into_call (call, mode);
+ return;
+ }
- create_address_operand (&ops[0], begin);
- create_address_operand (&ops[1], end);
+ /* Expand the operands. */
+ mem = get_builtin_sync_mem (gimple_call_arg (call, 0), mode);
- if (maybe_expand_insn (targetm.code_for_clear_cache, 2, ops))
- return;
- }
- else
+ expect = expand_expr_force_mode (gimple_call_arg (call, 1), mode);
+ desired = expand_expr_force_mode (gimple_call_arg (call, 2), mode);
+
+ is_weak = (tree_to_shwi (gimple_call_arg (call, 3)) & 256) != 0;
+
+ boolret = NULL;
+ oldval = NULL;
+
+ if (!expand_atomic_compare_and_swap (&boolret, &oldval, mem, expect, desired,
+ is_weak, success, failure))
{
-#ifndef CLEAR_INSN_CACHE
- /* There is no "clear_cache" insn, and __clear_cache() in libgcc
- does nothing. There is no need to call it. Do nothing. */
+ expand_ifn_atomic_compare_exchange_into_call (call, mode);
return;
-#endif /* CLEAR_INSN_CACHE */
}
- targetm.calls.emit_call_builtin___clear_cache (begin, end);
+ lhs = gimple_call_lhs (call);
+ if (lhs)
+ {
+ rtx target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
+ if (GET_MODE (boolret) != mode)
+ boolret = convert_modes (mode, GET_MODE (boolret), boolret, 1);
+ write_complex_part (target, boolret, true);
+ write_complex_part (target, oldval, false);
+ }
}
-/* Expand a call to __builtin___clear_cache. */
+/* Expand the __atomic_load intrinsic:
+ TYPE __atomic_load (TYPE *object, enum memmodel)
+ EXP is the CALL_EXPR.
+ TARGET is an optional place for us to store the results. */
-static void
-expand_builtin___clear_cache (tree exp)
+static rtx
+expand_builtin_atomic_load (machine_mode mode, tree exp, rtx target)
{
- tree begin, end;
- rtx begin_rtx, end_rtx;
+ rtx mem;
+ enum memmodel model;
- /* We must not expand to a library call. If we did, any
- fallback library function in libgcc that might contain a call to
- __builtin___clear_cache() would recurse infinitely. */
- if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
+ model = get_memmodel (CALL_EXPR_ARG (exp, 1));
+ if (is_mm_release (model) || is_mm_acq_rel (model))
{
- error ("both arguments to %<__builtin___clear_cache%> must be pointers");
- return;
+ location_t loc
+ = expansion_point_location_if_in_system_header (input_location);
+ warning_at (loc, OPT_Winvalid_memory_model,
+ "invalid memory model for %<__atomic_load%>");
+ model = MEMMODEL_SEQ_CST;
}
- begin = CALL_EXPR_ARG (exp, 0);
- begin_rtx = expand_expr (begin, NULL_RTX, Pmode, EXPAND_NORMAL);
+ if (!flag_inline_atomics)
+ return NULL_RTX;
- end = CALL_EXPR_ARG (exp, 1);
- end_rtx = expand_expr (end, NULL_RTX, Pmode, EXPAND_NORMAL);
+ /* Expand the operand. */
+ mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
- maybe_emit_call_builtin___clear_cache (begin_rtx, end_rtx);
+ return expand_atomic_load (target, mem, model);
}
-/* Given a trampoline address, make sure it satisfies TRAMPOLINE_ALIGNMENT. */
+
+/* Expand the __atomic_store intrinsic:
+ void __atomic_store (TYPE *object, TYPE desired, enum memmodel)
+ EXP is the CALL_EXPR.
+ TARGET is an optional place for us to store the results. */
static rtx
-round_trampoline_addr (rtx tramp)
+expand_builtin_atomic_store (machine_mode mode, tree exp)
{
- rtx temp, addend, mask;
+ rtx mem, val;
+ enum memmodel model;
- /* If we don't need too much alignment, we'll have been guaranteed
- proper alignment by get_trampoline_type. */
- if (TRAMPOLINE_ALIGNMENT <= STACK_BOUNDARY)
- return tramp;
+ model = get_memmodel (CALL_EXPR_ARG (exp, 2));
+ if (!(is_mm_relaxed (model) || is_mm_seq_cst (model)
+ || is_mm_release (model)))
+ {
+ location_t loc
+ = expansion_point_location_if_in_system_header (input_location);
+ warning_at (loc, OPT_Winvalid_memory_model,
+ "invalid memory model for %<__atomic_store%>");
+ model = MEMMODEL_SEQ_CST;
+ }
- /* Round address up to desired boundary. */
- temp = gen_reg_rtx (Pmode);
- addend = gen_int_mode (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT - 1, Pmode);
- mask = gen_int_mode (-TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT, Pmode);
+ if (!flag_inline_atomics)
+ return NULL_RTX;
- temp = expand_simple_binop (Pmode, PLUS, tramp, addend,
- temp, 0, OPTAB_LIB_WIDEN);
- tramp = expand_simple_binop (Pmode, AND, temp, mask,
- temp, 0, OPTAB_LIB_WIDEN);
+ /* Expand the operands. */
+ mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
+ val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);
- return tramp;
+ return expand_atomic_store (mem, val, model, false);
}
+/* Expand the __atomic_fetch_XXX intrinsic:
+ TYPE __atomic_fetch_XXX (TYPE *object, TYPE val, enum memmodel)
+ EXP is the CALL_EXPR.
+ TARGET is an optional place for us to store the results.
+ CODE is the operation, PLUS, MINUS, ADD, XOR, or IOR.
+ FETCH_AFTER is true if returning the result of the operation.
+ FETCH_AFTER is false if returning the value before the operation.
+ IGNORE is true if the result is not used.
+ EXT_CALL is the correct builtin for an external call if this cannot be
+ resolved to an instruction sequence. */
+
static rtx
-expand_builtin_init_trampoline (tree exp, bool onstack)
+expand_builtin_atomic_fetch_op (machine_mode mode, tree exp, rtx target,
+ enum rtx_code code, bool fetch_after,
+ bool ignore, enum built_in_function ext_call)
{
- tree t_tramp, t_func, t_chain;
- rtx m_tramp, r_tramp, r_chain, tmp;
+ rtx val, mem, ret;
+ enum memmodel model;
+ tree fndecl;
+ tree addr;
- if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE,
- POINTER_TYPE, VOID_TYPE))
- return NULL_RTX;
+ model = get_memmodel (CALL_EXPR_ARG (exp, 2));
- t_tramp = CALL_EXPR_ARG (exp, 0);
- t_func = CALL_EXPR_ARG (exp, 1);
- t_chain = CALL_EXPR_ARG (exp, 2);
+ /* Expand the operands. */
+ mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
+ val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);
- r_tramp = expand_normal (t_tramp);
- m_tramp = gen_rtx_MEM (BLKmode, r_tramp);
- MEM_NOTRAP_P (m_tramp) = 1;
+ /* Only try generating instructions if inlining is turned on. */
+ if (flag_inline_atomics)
+ {
+ ret = expand_atomic_fetch_op (target, mem, val, code, model, fetch_after);
+ if (ret)
+ return ret;
+ }
- /* If ONSTACK, the TRAMP argument should be the address of a field
- within the local function's FRAME decl. Either way, let's see if
- we can fill in the MEM_ATTRs for this memory. */
- if (TREE_CODE (t_tramp) == ADDR_EXPR)
- set_mem_attributes (m_tramp, TREE_OPERAND (t_tramp, 0), true);
+ /* Return if a different routine isn't needed for the library call. */
+ if (ext_call == BUILT_IN_NONE)
+ return NULL_RTX;
- /* Creator of a heap trampoline is responsible for making sure the
- address is aligned to at least STACK_BOUNDARY. Normally malloc
- will ensure this anyhow. */
- tmp = round_trampoline_addr (r_tramp);
- if (tmp != r_tramp)
- {
- m_tramp = change_address (m_tramp, BLKmode, tmp);
- set_mem_align (m_tramp, TRAMPOLINE_ALIGNMENT);
- set_mem_size (m_tramp, TRAMPOLINE_SIZE);
- }
+ /* Change the call to the specified function. */
+ fndecl = get_callee_fndecl (exp);
+ addr = CALL_EXPR_FN (exp);
+ STRIP_NOPS (addr);
- /* The FUNC argument should be the address of the nested function.
- Extract the actual function decl to pass to the hook. */
- gcc_assert (TREE_CODE (t_func) == ADDR_EXPR);
- t_func = TREE_OPERAND (t_func, 0);
- gcc_assert (TREE_CODE (t_func) == FUNCTION_DECL);
+ gcc_assert (TREE_OPERAND (addr, 0) == fndecl);
+ TREE_OPERAND (addr, 0) = builtin_decl_explicit (ext_call);
- r_chain = expand_normal (t_chain);
+ /* If we will emit code after the call, the call cannot be a tail call.
+ If it is emitted as a tail call, a barrier is emitted after it, and
+ then all trailing code is removed. */
+ if (!ignore)
+ CALL_EXPR_TAILCALL (exp) = 0;
- /* Generate insns to initialize the trampoline. */
- targetm.calls.trampoline_init (m_tramp, t_func, r_chain);
+ /* Expand the call here so we can emit trailing code. */
+ ret = expand_call (exp, target, ignore);
- if (onstack)
- {
- trampolines_created = 1;
+ /* Replace the original function just in case it matters. */
+ TREE_OPERAND (addr, 0) = fndecl;
- if (targetm.calls.custom_function_descriptors != 0)
- warning_at (DECL_SOURCE_LOCATION (t_func), OPT_Wtrampolines,
- "trampoline generated for nested function %qD", t_func);
+ /* Then issue the arithmetic correction to return the right result. */
+ if (!ignore)
+ {
+ if (code == NOT)
+ {
+ ret = expand_simple_binop (mode, AND, ret, val, NULL_RTX, true,
+ OPTAB_LIB_WIDEN);
+ ret = expand_simple_unop (mode, NOT, ret, target, true);
+ }
+ else
+ ret = expand_simple_binop (mode, code, ret, val, target, true,
+ OPTAB_LIB_WIDEN);
}
-
- return const0_rtx;
+ return ret;
}
-static rtx
-expand_builtin_adjust_trampoline (tree exp)
+/* Expand IFN_ATOMIC_BIT_TEST_AND_* internal function. */
+
+void
+expand_ifn_atomic_bit_test_and (gcall *call)
{
- rtx tramp;
+ tree ptr = gimple_call_arg (call, 0);
+ tree bit = gimple_call_arg (call, 1);
+ tree flag = gimple_call_arg (call, 2);
+ tree lhs = gimple_call_lhs (call);
+ enum memmodel model = MEMMODEL_SYNC_SEQ_CST;
+ machine_mode mode = TYPE_MODE (TREE_TYPE (flag));
+ enum rtx_code code;
+ optab optab;
+ class expand_operand ops[5];
- if (!validate_arglist (exp, POINTER_TYPE, VOID_TYPE))
- return NULL_RTX;
+ gcc_assert (flag_inline_atomics);
- tramp = expand_normal (CALL_EXPR_ARG (exp, 0));
- tramp = round_trampoline_addr (tramp);
- if (targetm.calls.trampoline_adjust_address)
- tramp = targetm.calls.trampoline_adjust_address (tramp);
+ if (gimple_call_num_args (call) == 4)
+ model = get_memmodel (gimple_call_arg (call, 3));
- return tramp;
-}
+ rtx mem = get_builtin_sync_mem (ptr, mode);
+ rtx val = expand_expr_force_mode (bit, mode);
-/* Expand a call to the builtin descriptor initialization routine.
- A descriptor is made up of a couple of pointers to the static
- chain and the code entry in this order. */
+ switch (gimple_call_internal_fn (call))
+ {
+ case IFN_ATOMIC_BIT_TEST_AND_SET:
+ code = IOR;
+ optab = atomic_bit_test_and_set_optab;
+ break;
+ case IFN_ATOMIC_BIT_TEST_AND_COMPLEMENT:
+ code = XOR;
+ optab = atomic_bit_test_and_complement_optab;
+ break;
+ case IFN_ATOMIC_BIT_TEST_AND_RESET:
+ code = AND;
+ optab = atomic_bit_test_and_reset_optab;
+ break;
+ default:
+ gcc_unreachable ();
+ }
-static rtx
-expand_builtin_init_descriptor (tree exp)
-{
- tree t_descr, t_func, t_chain;
- rtx m_descr, r_descr, r_func, r_chain;
+ if (lhs == NULL_TREE)
+ {
+ val = expand_simple_binop (mode, ASHIFT, const1_rtx,
+ val, NULL_RTX, true, OPTAB_DIRECT);
+ if (code == AND)
+ val = expand_simple_unop (mode, NOT, val, NULL_RTX, true);
+ expand_atomic_fetch_op (const0_rtx, mem, val, code, model, false);
+ return;
+ }
- if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, POINTER_TYPE,
- VOID_TYPE))
- return NULL_RTX;
+ rtx target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
+ enum insn_code icode = direct_optab_handler (optab, mode);
+ gcc_assert (icode != CODE_FOR_nothing);
+ create_output_operand (&ops[0], target, mode);
+ create_fixed_operand (&ops[1], mem);
+ create_convert_operand_to (&ops[2], val, mode, true);
+ create_integer_operand (&ops[3], model);
+ create_integer_operand (&ops[4], integer_onep (flag));
+ if (maybe_expand_insn (icode, 5, ops))
+ return;
- t_descr = CALL_EXPR_ARG (exp, 0);
- t_func = CALL_EXPR_ARG (exp, 1);
- t_chain = CALL_EXPR_ARG (exp, 2);
+ rtx bitval = val;
+ val = expand_simple_binop (mode, ASHIFT, const1_rtx,
+ val, NULL_RTX, true, OPTAB_DIRECT);
+ rtx maskval = val;
+ if (code == AND)
+ val = expand_simple_unop (mode, NOT, val, NULL_RTX, true);
+ rtx result = expand_atomic_fetch_op (gen_reg_rtx (mode), mem, val,
+ code, model, false);
+ if (integer_onep (flag))
+ {
+ result = expand_simple_binop (mode, ASHIFTRT, result, bitval,
+ NULL_RTX, true, OPTAB_DIRECT);
+ result = expand_simple_binop (mode, AND, result, const1_rtx, target,
+ true, OPTAB_DIRECT);
+ }
+ else
+ result = expand_simple_binop (mode, AND, result, maskval, target, true,
+ OPTAB_DIRECT);
+ if (result != target)
+ emit_move_insn (target, result);
+}
- r_descr = expand_normal (t_descr);
- m_descr = gen_rtx_MEM (BLKmode, r_descr);
- MEM_NOTRAP_P (m_descr) = 1;
- set_mem_align (m_descr, GET_MODE_ALIGNMENT (ptr_mode));
+/* Expand an atomic clear operation.
+ void _atomic_clear (BOOL *obj, enum memmodel)
+ EXP is the call expression. */
- r_func = expand_normal (t_func);
- r_chain = expand_normal (t_chain);
+static rtx
+expand_builtin_atomic_clear (tree exp)
+{
+ machine_mode mode;
+ rtx mem, ret;
+ enum memmodel model;
- /* Generate insns to initialize the descriptor. */
- emit_move_insn (adjust_address_nv (m_descr, ptr_mode, 0), r_chain);
- emit_move_insn (adjust_address_nv (m_descr, ptr_mode,
- POINTER_SIZE / BITS_PER_UNIT), r_func);
+ mode = int_mode_for_size (BOOL_TYPE_SIZE, 0).require ();
+ mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
+ model = get_memmodel (CALL_EXPR_ARG (exp, 1));
+
+ if (is_mm_consume (model) || is_mm_acquire (model) || is_mm_acq_rel (model))
+ {
+ location_t loc
+ = expansion_point_location_if_in_system_header (input_location);
+ warning_at (loc, OPT_Winvalid_memory_model,
+ "invalid memory model for %<__atomic_store%>");
+ model = MEMMODEL_SEQ_CST;
+ }
+ /* Try issuing an __atomic_store, and allow fallback to __sync_lock_release.
+ Failing that, a store is issued by __atomic_store. The only way this can
+ fail is if the bool type is larger than a word size. Unlikely, but
+ handle it anyway for completeness. Assume a single threaded model since
+ there is no atomic support in this case, and no barriers are required. */
+ ret = expand_atomic_store (mem, const0_rtx, model, true);
+ if (!ret)
+ emit_move_insn (mem, const0_rtx);
return const0_rtx;
}
-/* Expand a call to the builtin descriptor adjustment routine. */
+/* Expand an atomic test_and_set operation.
+ bool _atomic_test_and_set (BOOL *obj, enum memmodel)
+ EXP is the call expression. */
static rtx
-expand_builtin_adjust_descriptor (tree exp)
+expand_builtin_atomic_test_and_set (tree exp, rtx target)
{
- rtx tramp;
+ rtx mem;
+ enum memmodel model;
+ machine_mode mode;
- if (!validate_arglist (exp, POINTER_TYPE, VOID_TYPE))
- return NULL_RTX;
+ mode = int_mode_for_size (BOOL_TYPE_SIZE, 0).require ();
+ mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
+ model = get_memmodel (CALL_EXPR_ARG (exp, 1));
- tramp = expand_normal (CALL_EXPR_ARG (exp, 0));
+ return expand_atomic_test_and_set (target, mem, model);
+}
- /* Unalign the descriptor to allow runtime identification. */
- tramp = plus_constant (ptr_mode, tramp,
- targetm.calls.custom_function_descriptors);
- return force_operand (tramp, NULL_RTX);
-}
+/* Return true if (optional) argument ARG1 of size ARG0 is always lock free on
+ this architecture. If ARG1 is NULL, use typical alignment for size ARG0. */
-/* Expand the call EXP to the built-in signbit, signbitf or signbitl
- function. The function first checks whether the back end provides
- an insn to implement signbit for the respective mode. If not, it
- checks whether the floating point format of the value is such that
- the sign bit can be extracted. If that is not the case, error out.
- EXP is the expression that is a call to the builtin function; if
- convenient, the result should be placed in TARGET. */
-static rtx
-expand_builtin_signbit (tree exp, rtx target)
+static tree
+fold_builtin_atomic_always_lock_free (tree arg0, tree arg1)
{
- const struct real_format *fmt;
- scalar_float_mode fmode;
- scalar_int_mode rmode, imode;
- tree arg;
- int word, bitpos;
- enum insn_code icode;
- rtx temp;
- location_t loc = EXPR_LOCATION (exp);
-
- if (!validate_arglist (exp, REAL_TYPE, VOID_TYPE))
- return NULL_RTX;
+ int size;
+ machine_mode mode;
+ unsigned int mode_align, type_align;
- arg = CALL_EXPR_ARG (exp, 0);
- fmode = SCALAR_FLOAT_TYPE_MODE (TREE_TYPE (arg));
- rmode = SCALAR_INT_TYPE_MODE (TREE_TYPE (exp));
- fmt = REAL_MODE_FORMAT (fmode);
+ if (TREE_CODE (arg0) != INTEGER_CST)
+ return NULL_TREE;
- arg = builtin_save_expr (arg);
+ /* We need a corresponding integer mode for the access to be lock-free. */
+ size = INTVAL (expand_normal (arg0)) * BITS_PER_UNIT;
+ if (!int_mode_for_size (size, 0).exists (&mode))
+ return boolean_false_node;
- /* Expand the argument yielding a RTX expression. */
- temp = expand_normal (arg);
+ mode_align = GET_MODE_ALIGNMENT (mode);
- /* Check if the back end provides an insn that handles signbit for the
- argument's mode. */
- icode = optab_handler (signbit_optab, fmode);
- if (icode != CODE_FOR_nothing)
+ if (TREE_CODE (arg1) == INTEGER_CST)
{
- rtx_insn *last = get_last_insn ();
- target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
- if (maybe_emit_unop_insn (icode, target, temp, UNKNOWN))
- return target;
- delete_insns_since (last);
- }
-
- /* For floating point formats without a sign bit, implement signbit
- as "ARG < 0.0". */
- bitpos = fmt->signbit_ro;
- if (bitpos < 0)
- {
- /* But we can't do this if the format supports signed zero. */
- gcc_assert (!fmt->has_signed_zero || !HONOR_SIGNED_ZEROS (fmode));
+ unsigned HOST_WIDE_INT val = UINTVAL (expand_normal (arg1));
- arg = fold_build2_loc (loc, LT_EXPR, TREE_TYPE (exp), arg,
- build_real (TREE_TYPE (arg), dconst0));
- return expand_expr (arg, target, VOIDmode, EXPAND_NORMAL);
- }
+ /* Either this argument is null, or it's a fake pointer encoding
+ the alignment of the object. */
+ val = least_bit_hwi (val);
+ val *= BITS_PER_UNIT;
- if (GET_MODE_SIZE (fmode) <= UNITS_PER_WORD)
- {
- imode = int_mode_for_mode (fmode).require ();
- temp = gen_lowpart (imode, temp);
+ if (val == 0 || mode_align < val)
+ type_align = mode_align;
+ else
+ type_align = val;
}
else
{
- imode = word_mode;
- /* Handle targets with different FP word orders. */
- if (FLOAT_WORDS_BIG_ENDIAN)
- word = (GET_MODE_BITSIZE (fmode) - bitpos) / BITS_PER_WORD;
- else
- word = bitpos / BITS_PER_WORD;
- temp = operand_subword_force (temp, word, fmode);
- bitpos = bitpos % BITS_PER_WORD;
- }
-
- /* Force the intermediate word_mode (or narrower) result into a
- register. This avoids attempting to create paradoxical SUBREGs
- of floating point modes below. */
- temp = force_reg (imode, temp);
+ tree ttype = TREE_TYPE (arg1);
- /* If the bitpos is within the "result mode" lowpart, the operation
- can be implement with a single bitwise AND. Otherwise, we need
- a right shift and an AND. */
+ /* This function is usually invoked and folded immediately by the front
+ end before anything else has a chance to look at it. The pointer
+ parameter at this point is usually cast to a void *, so check for that
+ and look past the cast. */
+ if (CONVERT_EXPR_P (arg1)
+ && POINTER_TYPE_P (ttype)
+ && VOID_TYPE_P (TREE_TYPE (ttype))
+ && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (arg1, 0))))
+ arg1 = TREE_OPERAND (arg1, 0);
- if (bitpos < GET_MODE_BITSIZE (rmode))
- {
- wide_int mask = wi::set_bit_in_zero (bitpos, GET_MODE_PRECISION (rmode));
+ ttype = TREE_TYPE (arg1);
+ gcc_assert (POINTER_TYPE_P (ttype));
- if (GET_MODE_SIZE (imode) > GET_MODE_SIZE (rmode))
- temp = gen_lowpart (rmode, temp);
- temp = expand_binop (rmode, and_optab, temp,
- immed_wide_int_const (mask, rmode),
- NULL_RTX, 1, OPTAB_LIB_WIDEN);
- }
- else
- {
- /* Perform a logical right shift to place the signbit in the least
- significant bit, then truncate the result to the desired mode
- and mask just this bit. */
- temp = expand_shift (RSHIFT_EXPR, imode, temp, bitpos, NULL_RTX, 1);
- temp = gen_lowpart (rmode, temp);
- temp = expand_binop (rmode, and_optab, temp, const1_rtx,
- NULL_RTX, 1, OPTAB_LIB_WIDEN);
+ /* Get the underlying type of the object. */
+ ttype = TREE_TYPE (ttype);
+ type_align = TYPE_ALIGN (ttype);
}
- return temp;
+ /* If the object has smaller alignment, the lock free routines cannot
+ be used. */
+ if (type_align < mode_align)
+ return boolean_false_node;
+
+ /* Check if a compare_and_swap pattern exists for the mode which represents
+ the required size. The pattern is not allowed to fail, so the existence
+ of the pattern indicates support is present. Also require that an
+ atomic load exists for the required size. */
+ if (can_compare_and_swap_p (mode, true) && can_atomic_load_p (mode))
+ return boolean_true_node;
+ else
+ return boolean_false_node;
}
-/* Expand fork or exec calls. TARGET is the desired target of the
- call. EXP is the call. FN is the
- identificator of the actual function. IGNORE is nonzero if the
- value is to be ignored. */
+/* Return true if the parameters to call EXP represent an object which will
+ always generate lock free instructions. The first argument represents the
+ size of the object, and the second parameter is a pointer to the object
+ itself. If NULL is passed for the object, then the result is based on
+ typical alignment for an object of the specified size. Otherwise return
+ false. */
static rtx
-expand_builtin_fork_or_exec (tree fn, tree exp, rtx target, int ignore)
+expand_builtin_atomic_always_lock_free (tree exp)
{
- tree id, decl;
- tree call;
+ tree size;
+ tree arg0 = CALL_EXPR_ARG (exp, 0);
+ tree arg1 = CALL_EXPR_ARG (exp, 1);
- if (DECL_FUNCTION_CODE (fn) != BUILT_IN_FORK)
+ if (TREE_CODE (arg0) != INTEGER_CST)
{
- tree path = CALL_EXPR_ARG (exp, 0);
- /* Detect unterminated path. */
- if (!check_read_access (exp, path))
- return NULL_RTX;
-
- /* Also detect unterminated first argument. */
- switch (DECL_FUNCTION_CODE (fn))
- {
- case BUILT_IN_EXECL:
- case BUILT_IN_EXECLE:
- case BUILT_IN_EXECLP:
- if (!check_read_access (exp, path))
- return NULL_RTX;
- default:
- break;
- }
+ error ("non-constant argument 1 to %qs", "__atomic_always_lock_free");
+ return const0_rtx;
}
+ size = fold_builtin_atomic_always_lock_free (arg0, arg1);
+ if (size == boolean_true_node)
+ return const1_rtx;
+ return const0_rtx;
+}
- /* If we are not profiling, just call the function. */
- if (!profile_arc_flag)
- return NULL_RTX;
-
- /* Otherwise call the wrapper. This should be equivalent for the rest of
- compiler, so the code does not diverge, and the wrapper may run the
- code necessary for keeping the profiling sane. */
-
- switch (DECL_FUNCTION_CODE (fn))
- {
- case BUILT_IN_FORK:
- id = get_identifier ("__gcov_fork");
- break;
-
- case BUILT_IN_EXECL:
- id = get_identifier ("__gcov_execl");
- break;
-
- case BUILT_IN_EXECV:
- id = get_identifier ("__gcov_execv");
- break;
+/* Return a one or zero if it can be determined that object ARG1 of size ARG
+ is lock free on this architecture. */
- case BUILT_IN_EXECLP:
- id = get_identifier ("__gcov_execlp");
- break;
+static tree
+fold_builtin_atomic_is_lock_free (tree arg0, tree arg1)
+{
+ if (!flag_inline_atomics)
+ return NULL_TREE;
+
+ /* If it isn't always lock free, don't generate a result. */
+ if (fold_builtin_atomic_always_lock_free (arg0, arg1) == boolean_true_node)
+ return boolean_true_node;
- case BUILT_IN_EXECLE:
- id = get_identifier ("__gcov_execle");
- break;
+ return NULL_TREE;
+}
- case BUILT_IN_EXECVP:
- id = get_identifier ("__gcov_execvp");
- break;
+/* Return true if the parameters to call EXP represent an object which will
+ always generate lock free instructions. The first argument represents the
+ size of the object, and the second parameter is a pointer to the object
+ itself. If NULL is passed for the object, then the result is based on
+ typical alignment for an object of the specified size. Otherwise return
+ NULL*/
- case BUILT_IN_EXECVE:
- id = get_identifier ("__gcov_execve");
- break;
+static rtx
+expand_builtin_atomic_is_lock_free (tree exp)
+{
+ tree size;
+ tree arg0 = CALL_EXPR_ARG (exp, 0);
+ tree arg1 = CALL_EXPR_ARG (exp, 1);
- default:
- gcc_unreachable ();
+ if (!INTEGRAL_TYPE_P (TREE_TYPE (arg0)))
+ {
+ error ("non-integer argument 1 to %qs", "__atomic_is_lock_free");
+ return NULL_RTX;
}
- decl = build_decl (DECL_SOURCE_LOCATION (fn),
- FUNCTION_DECL, id, TREE_TYPE (fn));
- DECL_EXTERNAL (decl) = 1;
- TREE_PUBLIC (decl) = 1;
- DECL_ARTIFICIAL (decl) = 1;
- TREE_NOTHROW (decl) = 1;
- DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
- DECL_VISIBILITY_SPECIFIED (decl) = 1;
- call = rewrite_call_expr (EXPR_LOCATION (exp), exp, 0, decl, 0);
- return expand_call (call, target, ignore);
- }
+ if (!flag_inline_atomics)
+ return NULL_RTX;
+ /* If the value is known at compile time, return the RTX for it. */
+ size = fold_builtin_atomic_is_lock_free (arg0, arg1);
+ if (size == boolean_true_node)
+ return const1_rtx;
-\f
-/* Reconstitute a mode for a __sync intrinsic operation. Since the type of
- the pointer in these functions is void*, the tree optimizers may remove
- casts. The mode computed in expand_builtin isn't reliable either, due
- to __sync_bool_compare_and_swap.
+ return NULL_RTX;
+}
- FCODE_DIFF should be fcode - base, where base is the FOO_1 code for the
- group of builtins. This gives us log2 of the mode size. */
+/* Expand the __atomic_thread_fence intrinsic:
+ void __atomic_thread_fence (enum memmodel)
+ EXP is the CALL_EXPR. */
-static inline machine_mode
-get_builtin_sync_mode (int fcode_diff)
+static void
+expand_builtin_atomic_thread_fence (tree exp)
{
- /* The size is not negotiable, so ask not to get BLKmode in return
- if the target indicates that a smaller size would be better. */
- return int_mode_for_size (BITS_PER_UNIT << fcode_diff, 0).require ();
+ enum memmodel model = get_memmodel (CALL_EXPR_ARG (exp, 0));
+ expand_mem_thread_fence (model);
}
-/* Expand the memory expression LOC and return the appropriate memory operand
- for the builtin_sync operations. */
+/* Expand the __atomic_signal_fence intrinsic:
+ void __atomic_signal_fence (enum memmodel)
+ EXP is the CALL_EXPR. */
-static rtx
-get_builtin_sync_mem (tree loc, machine_mode mode)
+static void
+expand_builtin_atomic_signal_fence (tree exp)
{
- rtx addr, mem;
- int addr_space = TYPE_ADDR_SPACE (POINTER_TYPE_P (TREE_TYPE (loc))
- ? TREE_TYPE (TREE_TYPE (loc))
- : TREE_TYPE (loc));
- scalar_int_mode addr_mode = targetm.addr_space.address_mode (addr_space);
-
- addr = expand_expr (loc, NULL_RTX, addr_mode, EXPAND_SUM);
- addr = convert_memory_address (addr_mode, addr);
-
- /* Note that we explicitly do not want any alias information for this
- memory, so that we kill all other live memories. Otherwise we don't
- satisfy the full barrier semantics of the intrinsic. */
- mem = gen_rtx_MEM (mode, addr);
-
- set_mem_addr_space (mem, addr_space);
-
- mem = validize_mem (mem);
+ enum memmodel model = get_memmodel (CALL_EXPR_ARG (exp, 0));
+ expand_mem_signal_fence (model);
+}
- /* The alignment needs to be at least according to that of the mode. */
- set_mem_align (mem, MAX (GET_MODE_ALIGNMENT (mode),
- get_pointer_alignment (loc)));
- set_mem_alias_set (mem, ALIAS_SET_MEMORY_BARRIER);
- MEM_VOLATILE_P (mem) = 1;
+/* Expand the __sync_synchronize intrinsic. */
- return mem;
+static void
+expand_builtin_sync_synchronize (void)
+{
+ expand_mem_thread_fence (MEMMODEL_SYNC_SEQ_CST);
}
-/* Make sure an argument is in the right mode.
- EXP is the tree argument.
- MODE is the mode it should be in. */
-
static rtx
-expand_expr_force_mode (tree exp, machine_mode mode)
+expand_builtin_thread_pointer (tree exp, rtx target)
{
- rtx val;
- machine_mode old_mode;
-
- if (TREE_CODE (exp) == SSA_NAME
- && TYPE_MODE (TREE_TYPE (exp)) != mode)
+ enum insn_code icode;
+ if (!validate_arglist (exp, VOID_TYPE))
+ return const0_rtx;
+ icode = direct_optab_handler (get_thread_pointer_optab, Pmode);
+ if (icode != CODE_FOR_nothing)
{
- /* Undo argument promotion if possible, as combine might not
- be able to do it later due to MEM_VOLATILE_P uses in the
- patterns. */
- gimple *g = get_gimple_for_ssa_name (exp);
- if (g && gimple_assign_cast_p (g))
- {
- tree rhs = gimple_assign_rhs1 (g);
- tree_code code = gimple_assign_rhs_code (g);
- if (CONVERT_EXPR_CODE_P (code)
- && TYPE_MODE (TREE_TYPE (rhs)) == mode
- && INTEGRAL_TYPE_P (TREE_TYPE (exp))
- && INTEGRAL_TYPE_P (TREE_TYPE (rhs))
- && (TYPE_PRECISION (TREE_TYPE (exp))
- > TYPE_PRECISION (TREE_TYPE (rhs))))
- exp = rhs;
- }
+ class expand_operand op;
+ /* If the target is not sutitable then create a new target. */
+ if (target == NULL_RTX
+ || !REG_P (target)
+ || GET_MODE (target) != Pmode)
+ target = gen_reg_rtx (Pmode);
+ create_output_operand (&op, target, Pmode);
+ expand_insn (icode, 1, &op);
+ return target;
}
-
- val = expand_expr (exp, NULL_RTX, mode, EXPAND_NORMAL);
- /* If VAL is promoted to a wider mode, convert it back to MODE. Take care
- of CONST_INTs, where we know the old_mode only from the call argument. */
-
- old_mode = GET_MODE (val);
- if (old_mode == VOIDmode)
- old_mode = TYPE_MODE (TREE_TYPE (exp));
- val = convert_modes (mode, old_mode, val, 1);
- return val;
+ error ("%<__builtin_thread_pointer%> is not supported on this target");
+ return const0_rtx;
}
-
-/* Expand the __sync_xxx_and_fetch and __sync_fetch_and_xxx intrinsics.
- EXP is the CALL_EXPR. CODE is the rtx code
- that corresponds to the arithmetic or logical operation from the name;
- an exception here is that NOT actually means NAND. TARGET is an optional
- place for us to store the results; AFTER is true if this is the
- fetch_and_xxx form. */
-
-static rtx
-expand_builtin_sync_operation (machine_mode mode, tree exp,
- enum rtx_code code, bool after,
- rtx target)
+static void
+expand_builtin_set_thread_pointer (tree exp)
{
- rtx val, mem;
- location_t loc = EXPR_LOCATION (exp);
-
- if (code == NOT && warn_sync_nand)
+ enum insn_code icode;
+ if (!validate_arglist (exp, POINTER_TYPE, VOID_TYPE))
+ return;
+ icode = direct_optab_handler (set_thread_pointer_optab, Pmode);
+ if (icode != CODE_FOR_nothing)
{
- tree fndecl = get_callee_fndecl (exp);
- enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
+ class expand_operand op;
+ rtx val = expand_expr (CALL_EXPR_ARG (exp, 0), NULL_RTX,
+ Pmode, EXPAND_NORMAL);
+ create_input_operand (&op, val, Pmode);
+ expand_insn (icode, 1, &op);
+ return;
+ }
+ error ("%<__builtin_set_thread_pointer%> is not supported on this target");
+}
- static bool warned_f_a_n, warned_n_a_f;
+\f
+/* Emit code to restore the current value of stack. */
- switch (fcode)
- {
- case BUILT_IN_SYNC_FETCH_AND_NAND_1:
- case BUILT_IN_SYNC_FETCH_AND_NAND_2:
- case BUILT_IN_SYNC_FETCH_AND_NAND_4:
- case BUILT_IN_SYNC_FETCH_AND_NAND_8:
- case BUILT_IN_SYNC_FETCH_AND_NAND_16:
- if (warned_f_a_n)
- break;
+static void
+expand_stack_restore (tree var)
+{
+ rtx_insn *prev;
+ rtx sa = expand_normal (var);
- fndecl = builtin_decl_implicit (BUILT_IN_SYNC_FETCH_AND_NAND_N);
- inform (loc, "%qD changed semantics in GCC 4.4", fndecl);
- warned_f_a_n = true;
- break;
+ sa = convert_memory_address (Pmode, sa);
- case BUILT_IN_SYNC_NAND_AND_FETCH_1:
- case BUILT_IN_SYNC_NAND_AND_FETCH_2:
- case BUILT_IN_SYNC_NAND_AND_FETCH_4:
- case BUILT_IN_SYNC_NAND_AND_FETCH_8:
- case BUILT_IN_SYNC_NAND_AND_FETCH_16:
- if (warned_n_a_f)
- break;
+ prev = get_last_insn ();
+ emit_stack_restore (SAVE_BLOCK, sa);
- fndecl = builtin_decl_implicit (BUILT_IN_SYNC_NAND_AND_FETCH_N);
- inform (loc, "%qD changed semantics in GCC 4.4", fndecl);
- warned_n_a_f = true;
- break;
+ record_new_stack_level ();
- default:
- gcc_unreachable ();
- }
- }
+ fixup_args_size_notes (prev, get_last_insn (), 0);
+}
- /* Expand the operands. */
- mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
- val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);
+/* Emit code to save the current value of stack. */
- return expand_atomic_fetch_op (target, mem, val, code, MEMMODEL_SYNC_SEQ_CST,
- after);
+static rtx
+expand_stack_save (void)
+{
+ rtx ret = NULL_RTX;
+
+ emit_stack_save (SAVE_BLOCK, &ret);
+ return ret;
}
-/* Expand the __sync_val_compare_and_swap and __sync_bool_compare_and_swap
- intrinsics. EXP is the CALL_EXPR. IS_BOOL is
- true if this is the boolean form. TARGET is a place for us to store the
- results; this is NOT optional if IS_BOOL is true. */
+/* Emit code to get the openacc gang, worker or vector id or size. */
static rtx
-expand_builtin_compare_and_swap (machine_mode mode, tree exp,
- bool is_bool, rtx target)
+expand_builtin_goacc_parlevel_id_size (tree exp, rtx target, int ignore)
{
- rtx old_val, new_val, mem;
- rtx *pbool, *poval;
+ const char *name;
+ rtx fallback_retval;
+ rtx_insn *(*gen_fn) (rtx, rtx);
+ switch (DECL_FUNCTION_CODE (get_callee_fndecl (exp)))
+ {
+ case BUILT_IN_GOACC_PARLEVEL_ID:
+ name = "__builtin_goacc_parlevel_id";
+ fallback_retval = const0_rtx;
+ gen_fn = targetm.gen_oacc_dim_pos;
+ break;
+ case BUILT_IN_GOACC_PARLEVEL_SIZE:
+ name = "__builtin_goacc_parlevel_size";
+ fallback_retval = const1_rtx;
+ gen_fn = targetm.gen_oacc_dim_size;
+ break;
+ default:
+ gcc_unreachable ();
+ }
- /* Expand the operands. */
- mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
- old_val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);
- new_val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 2), mode);
+ if (oacc_get_fn_attrib (current_function_decl) == NULL_TREE)
+ {
+ error ("%qs only supported in OpenACC code", name);
+ return const0_rtx;
+ }
- pbool = poval = NULL;
- if (target != const0_rtx)
+ tree arg = CALL_EXPR_ARG (exp, 0);
+ if (TREE_CODE (arg) != INTEGER_CST)
{
- if (is_bool)
- pbool = ⌖
- else
- poval = ⌖
+ error ("non-constant argument 0 to %qs", name);
+ return const0_rtx;
}
- if (!expand_atomic_compare_and_swap (pbool, poval, mem, old_val, new_val,
- false, MEMMODEL_SYNC_SEQ_CST,
- MEMMODEL_SYNC_SEQ_CST))
- return NULL_RTX;
- return target;
-}
+ int dim = TREE_INT_CST_LOW (arg);
+ switch (dim)
+ {
+ case GOMP_DIM_GANG:
+ case GOMP_DIM_WORKER:
+ case GOMP_DIM_VECTOR:
+ break;
+ default:
+ error ("illegal argument 0 to %qs", name);
+ return const0_rtx;
+ }
-/* Expand the __sync_lock_test_and_set intrinsic. Note that the most
- general form is actually an atomic exchange, and some targets only
- support a reduced form with the second argument being a constant 1.
- EXP is the CALL_EXPR; TARGET is an optional place for us to store
- the results. */
+ if (ignore)
+ return target;
-static rtx
-expand_builtin_sync_lock_test_and_set (machine_mode mode, tree exp,
- rtx target)
-{
- rtx val, mem;
+ if (target == NULL_RTX)
+ target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
- /* Expand the operands. */
- mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
- val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);
+ if (!targetm.have_oacc_dim_size ())
+ {
+ emit_move_insn (target, fallback_retval);
+ return target;
+ }
- return expand_sync_lock_test_and_set (target, mem, val);
-}
-
-/* Expand the __sync_lock_release intrinsic. EXP is the CALL_EXPR. */
+ rtx reg = MEM_P (target) ? gen_reg_rtx (GET_MODE (target)) : target;
+ emit_insn (gen_fn (reg, GEN_INT (dim)));
+ if (reg != target)
+ emit_move_insn (target, reg);
-static void
-expand_builtin_sync_lock_release (machine_mode mode, tree exp)
-{
- rtx mem;
+ return target;
+}
- /* Expand the operands. */
- mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
+/* Expand a string compare operation using a sequence of char comparison
+ to get rid of the calling overhead, with result going to TARGET if
+ that's convenient.
- expand_atomic_store (mem, const0_rtx, MEMMODEL_SYNC_RELEASE, true);
-}
+ VAR_STR is the variable string source;
+ CONST_STR is the constant string source;
+ LENGTH is the number of chars to compare;
+ CONST_STR_N indicates which source string is the constant string;
+ IS_MEMCMP indicates whether it's a memcmp or strcmp.
+
+ to: (assume const_str_n is 2, i.e., arg2 is a constant string)
-/* Given an integer representing an ``enum memmodel'', verify its
- correctness and return the memory model enum. */
+ target = (int) (unsigned char) var_str[0]
+ - (int) (unsigned char) const_str[0];
+ if (target != 0)
+ goto ne_label;
+ ...
+ target = (int) (unsigned char) var_str[length - 2]
+ - (int) (unsigned char) const_str[length - 2];
+ if (target != 0)
+ goto ne_label;
+ target = (int) (unsigned char) var_str[length - 1]
+ - (int) (unsigned char) const_str[length - 1];
+ ne_label:
+ */
-static enum memmodel
-get_memmodel (tree exp)
+static rtx
+inline_string_cmp (rtx target, tree var_str, const char *const_str,
+ unsigned HOST_WIDE_INT length,
+ int const_str_n, machine_mode mode)
{
- rtx op;
- unsigned HOST_WIDE_INT val;
- location_t loc
- = expansion_point_location_if_in_system_header (input_location);
-
- /* If the parameter is not a constant, it's a run time value so we'll just
- convert it to MEMMODEL_SEQ_CST to avoid annoying runtime checking. */
- if (TREE_CODE (exp) != INTEGER_CST)
- return MEMMODEL_SEQ_CST;
+ HOST_WIDE_INT offset = 0;
+ rtx var_rtx_array
+ = get_memory_rtx (var_str, build_int_cst (unsigned_type_node,length));
+ rtx var_rtx = NULL_RTX;
+ rtx const_rtx = NULL_RTX;
+ rtx result = target ? target : gen_reg_rtx (mode);
+ rtx_code_label *ne_label = gen_label_rtx ();
+ tree unit_type_node = unsigned_char_type_node;
+ scalar_int_mode unit_mode
+ = as_a <scalar_int_mode> TYPE_MODE (unit_type_node);
- op = expand_normal (exp);
+ start_sequence ();
- val = INTVAL (op);
- if (targetm.memmodel_check)
- val = targetm.memmodel_check (val);
- else if (val & ~MEMMODEL_MASK)
+ for (unsigned HOST_WIDE_INT i = 0; i < length; i++)
{
- warning_at (loc, OPT_Winvalid_memory_model,
- "unknown architecture specifier in memory model to builtin");
- return MEMMODEL_SEQ_CST;
- }
+ var_rtx
+ = adjust_address (var_rtx_array, TYPE_MODE (unit_type_node), offset);
+ const_rtx = c_readstr (const_str + offset, unit_mode);
+ rtx op0 = (const_str_n == 1) ? const_rtx : var_rtx;
+ rtx op1 = (const_str_n == 1) ? var_rtx : const_rtx;
- /* Should never see a user explicit SYNC memodel model, so >= LAST works. */
- if (memmodel_base (val) >= MEMMODEL_LAST)
- {
- warning_at (loc, OPT_Winvalid_memory_model,
- "invalid memory model argument to builtin");
- return MEMMODEL_SEQ_CST;
+ op0 = convert_modes (mode, unit_mode, op0, 1);
+ op1 = convert_modes (mode, unit_mode, op1, 1);
+ result = expand_simple_binop (mode, MINUS, op0, op1,
+ result, 1, OPTAB_WIDEN);
+ if (i < length - 1)
+ emit_cmp_and_jump_insns (result, CONST0_RTX (mode), NE, NULL_RTX,
+ mode, true, ne_label);
+ offset += GET_MODE_SIZE (unit_mode);
}
- /* Workaround for Bugzilla 59448. GCC doesn't track consume properly, so
- be conservative and promote consume to acquire. */
- if (val == MEMMODEL_CONSUME)
- val = MEMMODEL_ACQUIRE;
+ emit_label (ne_label);
+ rtx_insn *insns = get_insns ();
+ end_sequence ();
+ emit_insn (insns);
- return (enum memmodel) val;
+ return result;
}
-/* Expand the __atomic_exchange intrinsic:
- TYPE __atomic_exchange (TYPE *object, TYPE desired, enum memmodel)
- EXP is the CALL_EXPR.
- TARGET is an optional place for us to store the results. */
+/* Inline expansion of a call to str(n)cmp and memcmp, with result going
+ to TARGET if that's convenient.
+ If the call is not been inlined, return NULL_RTX. */
static rtx
-expand_builtin_atomic_exchange (machine_mode mode, tree exp, rtx target)
+inline_expand_builtin_bytecmp (tree exp, rtx target)
{
- rtx val, mem;
- enum memmodel model;
-
- model = get_memmodel (CALL_EXPR_ARG (exp, 2));
+ tree fndecl = get_callee_fndecl (exp);
+ enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
+ bool is_ncmp = (fcode == BUILT_IN_STRNCMP || fcode == BUILT_IN_MEMCMP);
- if (!flag_inline_atomics)
+ /* Do NOT apply this inlining expansion when optimizing for size or
+ optimization level below 2. */
+ if (optimize < 2 || optimize_insn_for_size_p ())
return NULL_RTX;
- /* Expand the operands. */
- mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
- val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);
+ gcc_checking_assert (fcode == BUILT_IN_STRCMP
+ || fcode == BUILT_IN_STRNCMP
+ || fcode == BUILT_IN_MEMCMP);
- return expand_atomic_exchange (target, mem, val, model);
-}
+ /* On a target where the type of the call (int) has same or narrower presicion
+ than unsigned char, give up the inlining expansion. */
+ if (TYPE_PRECISION (unsigned_char_type_node)
+ >= TYPE_PRECISION (TREE_TYPE (exp)))
+ return NULL_RTX;
-/* Expand the __atomic_compare_exchange intrinsic:
- bool __atomic_compare_exchange (TYPE *object, TYPE *expect,
- TYPE desired, BOOL weak,
- enum memmodel success,
- enum memmodel failure)
- EXP is the CALL_EXPR.
- TARGET is an optional place for us to store the results. */
+ tree arg1 = CALL_EXPR_ARG (exp, 0);
+ tree arg2 = CALL_EXPR_ARG (exp, 1);
+ tree len3_tree = is_ncmp ? CALL_EXPR_ARG (exp, 2) : NULL_TREE;
-static rtx
-expand_builtin_atomic_compare_exchange (machine_mode mode, tree exp,
- rtx target)
-{
- rtx expect, desired, mem, oldval;
- rtx_code_label *label;
- enum memmodel success, failure;
- tree weak;
- bool is_weak;
- location_t loc
- = expansion_point_location_if_in_system_header (input_location);
+ unsigned HOST_WIDE_INT len1 = 0;
+ unsigned HOST_WIDE_INT len2 = 0;
+ unsigned HOST_WIDE_INT len3 = 0;
- success = get_memmodel (CALL_EXPR_ARG (exp, 4));
- failure = get_memmodel (CALL_EXPR_ARG (exp, 5));
+ /* Get the object representation of the initializers of ARG1 and ARG2
+ as strings, provided they refer to constant objects, with their byte
+ sizes in LEN1 and LEN2, respectively. */
+ const char *bytes1 = getbyterep (arg1, &len1);
+ const char *bytes2 = getbyterep (arg2, &len2);
- if (failure > success)
+ /* Fail if neither argument refers to an initialized constant. */
+ if (!bytes1 && !bytes2)
+ return NULL_RTX;
+
+ if (is_ncmp)
{
- warning_at (loc, OPT_Winvalid_memory_model,
- "failure memory model cannot be stronger than success "
- "memory model for %<__atomic_compare_exchange%>");
- success = MEMMODEL_SEQ_CST;
+ /* Fail if the memcmp/strncmp bound is not a constant. */
+ if (!tree_fits_uhwi_p (len3_tree))
+ return NULL_RTX;
+
+ len3 = tree_to_uhwi (len3_tree);
+
+ if (fcode == BUILT_IN_MEMCMP)
+ {
+ /* Fail if the memcmp bound is greater than the size of either
+ of the two constant objects. */
+ if ((bytes1 && len1 < len3)
+ || (bytes2 && len2 < len3))
+ return NULL_RTX;
+ }
}
-
- if (is_mm_release (failure) || is_mm_acq_rel (failure))
+
+ if (fcode != BUILT_IN_MEMCMP)
{
- warning_at (loc, OPT_Winvalid_memory_model,
- "invalid failure memory model for "
- "%<__atomic_compare_exchange%>");
- failure = MEMMODEL_SEQ_CST;
- success = MEMMODEL_SEQ_CST;
+ /* For string functions (i.e., strcmp and strncmp) reduce LEN1
+ and LEN2 to the length of the nul-terminated string stored
+ in each. */
+ if (bytes1 != NULL)
+ len1 = strnlen (bytes1, len1) + 1;
+ if (bytes2 != NULL)
+ len2 = strnlen (bytes2, len2) + 1;
}
-
- if (!flag_inline_atomics)
- return NULL_RTX;
+ /* See inline_string_cmp. */
+ int const_str_n;
+ if (!len1)
+ const_str_n = 2;
+ else if (!len2)
+ const_str_n = 1;
+ else if (len2 > len1)
+ const_str_n = 1;
+ else
+ const_str_n = 2;
- /* Expand the operands. */
- mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
+ /* For strncmp only, compute the new bound as the smallest of
+ the lengths of the two strings (plus 1) and the bound provided
+ to the function. */
+ unsigned HOST_WIDE_INT bound = (const_str_n == 1) ? len1 : len2;
+ if (is_ncmp && len3 < bound)
+ bound = len3;
- expect = expand_normal (CALL_EXPR_ARG (exp, 1));
- expect = convert_memory_address (Pmode, expect);
- expect = gen_rtx_MEM (mode, expect);
- desired = expand_expr_force_mode (CALL_EXPR_ARG (exp, 2), mode);
+ /* If the bound of the comparison is larger than the threshold,
+ do nothing. */
+ if (bound > (unsigned HOST_WIDE_INT) param_builtin_string_cmp_inline_length)
+ return NULL_RTX;
- weak = CALL_EXPR_ARG (exp, 3);
- is_weak = false;
- if (tree_fits_shwi_p (weak) && tree_to_shwi (weak) != 0)
- is_weak = true;
+ machine_mode mode = TYPE_MODE (TREE_TYPE (exp));
- if (target == const0_rtx)
- target = NULL;
+ /* Now, start inline expansion the call. */
+ return inline_string_cmp (target, (const_str_n == 1) ? arg2 : arg1,
+ (const_str_n == 1) ? bytes1 : bytes2, bound,
+ const_str_n, mode);
+}
- /* Lest the rtl backend create a race condition with an imporoper store
- to memory, always create a new pseudo for OLDVAL. */
- oldval = NULL;
-
- if (!expand_atomic_compare_and_swap (&target, &oldval, mem, expect, desired,
- is_weak, success, failure))
- return NULL_RTX;
-
- /* Conditionally store back to EXPECT, lest we create a race condition
- with an improper store to memory. */
- /* ??? With a rearrangement of atomics at the gimple level, we can handle
- the normal case where EXPECT is totally private, i.e. a register. At
- which point the store can be unconditional. */
- label = gen_label_rtx ();
- emit_cmp_and_jump_insns (target, const0_rtx, NE, NULL,
- GET_MODE (target), 1, label);
- emit_move_insn (expect, oldval);
- emit_label (label);
-
- return target;
-}
-
-/* Helper function for expand_ifn_atomic_compare_exchange - expand
- internal ATOMIC_COMPARE_EXCHANGE call into __atomic_compare_exchange_N
- call. The weak parameter must be dropped to match the expected parameter
- list and the expected argument changed from value to pointer to memory
- slot. */
-
-static void
-expand_ifn_atomic_compare_exchange_into_call (gcall *call, machine_mode mode)
-{
- unsigned int z;
- vec<tree, va_gc> *vec;
-
- vec_alloc (vec, 5);
- vec->quick_push (gimple_call_arg (call, 0));
- tree expected = gimple_call_arg (call, 1);
- rtx x = assign_stack_temp_for_type (mode, GET_MODE_SIZE (mode),
- TREE_TYPE (expected));
- rtx expd = expand_expr (expected, x, mode, EXPAND_NORMAL);
- if (expd != x)
- emit_move_insn (x, expd);
- tree v = make_tree (TREE_TYPE (expected), x);
- vec->quick_push (build1 (ADDR_EXPR,
- build_pointer_type (TREE_TYPE (expected)), v));
- vec->quick_push (gimple_call_arg (call, 2));
- /* Skip the boolean weak parameter. */
- for (z = 4; z < 6; z++)
- vec->quick_push (gimple_call_arg (call, z));
- /* At present we only have BUILT_IN_ATOMIC_COMPARE_EXCHANGE_{1,2,4,8,16}. */
- unsigned int bytes_log2 = exact_log2 (GET_MODE_SIZE (mode).to_constant ());
- gcc_assert (bytes_log2 < 5);
- built_in_function fncode
- = (built_in_function) ((int) BUILT_IN_ATOMIC_COMPARE_EXCHANGE_1
- + bytes_log2);
- tree fndecl = builtin_decl_explicit (fncode);
- tree fn = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fndecl)),
- fndecl);
- tree exp = build_call_vec (boolean_type_node, fn, vec);
- tree lhs = gimple_call_lhs (call);
- rtx boolret = expand_call (exp, NULL_RTX, lhs == NULL_TREE);
- if (lhs)
- {
- rtx target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
- if (GET_MODE (boolret) != mode)
- boolret = convert_modes (mode, GET_MODE (boolret), boolret, 1);
- x = force_reg (mode, x);
- write_complex_part (target, boolret, true);
- write_complex_part (target, x, false);
- }
-}
-
-/* Expand IFN_ATOMIC_COMPARE_EXCHANGE internal function. */
-
-void
-expand_ifn_atomic_compare_exchange (gcall *call)
+/* Expand a call to __builtin_speculation_safe_value_<N>. MODE
+ represents the size of the first argument to that call, or VOIDmode
+ if the argument is a pointer. IGNORE will be true if the result
+ isn't used. */
+static rtx
+expand_speculation_safe_value (machine_mode mode, tree exp, rtx target,
+ bool ignore)
{
- int size = tree_to_shwi (gimple_call_arg (call, 3)) & 255;
- gcc_assert (size == 1 || size == 2 || size == 4 || size == 8 || size == 16);
- machine_mode mode = int_mode_for_size (BITS_PER_UNIT * size, 0).require ();
- rtx expect, desired, mem, oldval, boolret;
- enum memmodel success, failure;
- tree lhs;
- bool is_weak;
- location_t loc
- = expansion_point_location_if_in_system_header (gimple_location (call));
+ rtx val, failsafe;
+ unsigned nargs = call_expr_nargs (exp);
- success = get_memmodel (gimple_call_arg (call, 4));
- failure = get_memmodel (gimple_call_arg (call, 5));
+ tree arg0 = CALL_EXPR_ARG (exp, 0);
- if (failure > success)
+ if (mode == VOIDmode)
{
- warning_at (loc, OPT_Winvalid_memory_model,
- "failure memory model cannot be stronger than success "
- "memory model for %<__atomic_compare_exchange%>");
- success = MEMMODEL_SEQ_CST;
+ mode = TYPE_MODE (TREE_TYPE (arg0));
+ gcc_assert (GET_MODE_CLASS (mode) == MODE_INT);
}
- if (is_mm_release (failure) || is_mm_acq_rel (failure))
- {
- warning_at (loc, OPT_Winvalid_memory_model,
- "invalid failure memory model for "
- "%<__atomic_compare_exchange%>");
- failure = MEMMODEL_SEQ_CST;
- success = MEMMODEL_SEQ_CST;
- }
+ val = expand_expr (arg0, NULL_RTX, mode, EXPAND_NORMAL);
- if (!flag_inline_atomics)
+ /* An optional second argument can be used as a failsafe value on
+ some machines. If it isn't present, then the failsafe value is
+ assumed to be 0. */
+ if (nargs > 1)
{
- expand_ifn_atomic_compare_exchange_into_call (call, mode);
- return;
+ tree arg1 = CALL_EXPR_ARG (exp, 1);
+ failsafe = expand_expr (arg1, NULL_RTX, mode, EXPAND_NORMAL);
}
+ else
+ failsafe = const0_rtx;
- /* Expand the operands. */
- mem = get_builtin_sync_mem (gimple_call_arg (call, 0), mode);
-
- expect = expand_expr_force_mode (gimple_call_arg (call, 1), mode);
- desired = expand_expr_force_mode (gimple_call_arg (call, 2), mode);
-
- is_weak = (tree_to_shwi (gimple_call_arg (call, 3)) & 256) != 0;
+ /* If the result isn't used, the behavior is undefined. It would be
+ nice to emit a warning here, but path splitting means this might
+ happen with legitimate code. So simply drop the builtin
+ expansion in that case; we've handled any side-effects above. */
+ if (ignore)
+ return const0_rtx;
- boolret = NULL;
- oldval = NULL;
+ /* If we don't have a suitable target, create one to hold the result. */
+ if (target == NULL || GET_MODE (target) != mode)
+ target = gen_reg_rtx (mode);
- if (!expand_atomic_compare_and_swap (&boolret, &oldval, mem, expect, desired,
- is_weak, success, failure))
- {
- expand_ifn_atomic_compare_exchange_into_call (call, mode);
- return;
- }
+ if (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode)
+ val = convert_modes (mode, VOIDmode, val, false);
- lhs = gimple_call_lhs (call);
- if (lhs)
- {
- rtx target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
- if (GET_MODE (boolret) != mode)
- boolret = convert_modes (mode, GET_MODE (boolret), boolret, 1);
- write_complex_part (target, boolret, true);
- write_complex_part (target, oldval, false);
- }
+ return targetm.speculation_safe_value (mode, target, val, failsafe);
}
-/* Expand the __atomic_load intrinsic:
- TYPE __atomic_load (TYPE *object, enum memmodel)
- EXP is the CALL_EXPR.
- TARGET is an optional place for us to store the results. */
+/* Expand an expression EXP that calls a built-in function,
+ with result going to TARGET if that's convenient
+ (and in mode MODE if that's convenient).
+ SUBTARGET may be used as the target for computing one of EXP's operands.
+ IGNORE is nonzero if the value is to be ignored. */
-static rtx
-expand_builtin_atomic_load (machine_mode mode, tree exp, rtx target)
+rtx
+expand_builtin (tree exp, rtx target, rtx subtarget, machine_mode mode,
+ int ignore)
{
- rtx mem;
- enum memmodel model;
-
- model = get_memmodel (CALL_EXPR_ARG (exp, 1));
- if (is_mm_release (model) || is_mm_acq_rel (model))
- {
- location_t loc
- = expansion_point_location_if_in_system_header (input_location);
- warning_at (loc, OPT_Winvalid_memory_model,
- "invalid memory model for %<__atomic_load%>");
- model = MEMMODEL_SEQ_CST;
- }
-
- if (!flag_inline_atomics)
- return NULL_RTX;
+ tree fndecl = get_callee_fndecl (exp);
+ machine_mode target_mode = TYPE_MODE (TREE_TYPE (exp));
+ int flags;
- /* Expand the operand. */
- mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
+ if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
+ return targetm.expand_builtin (exp, target, subtarget, mode, ignore);
- return expand_atomic_load (target, mem, model);
-}
+ /* When ASan is enabled, we don't want to expand some memory/string
+ builtins and rely on libsanitizer's hooks. This allows us to avoid
+ redundant checks and be sure, that possible overflow will be detected
+ by ASan. */
+ enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
+ if ((flag_sanitize & SANITIZE_ADDRESS) && asan_intercepted_p (fcode))
+ return expand_call (exp, target, ignore);
-/* Expand the __atomic_store intrinsic:
- void __atomic_store (TYPE *object, TYPE desired, enum memmodel)
- EXP is the CALL_EXPR.
- TARGET is an optional place for us to store the results. */
+ /* When not optimizing, generate calls to library functions for a certain
+ set of builtins. */
+ if (!optimize
+ && !called_as_built_in (fndecl)
+ && fcode != BUILT_IN_FORK
+ && fcode != BUILT_IN_EXECL
+ && fcode != BUILT_IN_EXECV
+ && fcode != BUILT_IN_EXECLP
+ && fcode != BUILT_IN_EXECLE
+ && fcode != BUILT_IN_EXECVP
+ && fcode != BUILT_IN_EXECVE
+ && fcode != BUILT_IN_CLEAR_CACHE
+ && !ALLOCA_FUNCTION_CODE_P (fcode)
+ && fcode != BUILT_IN_FREE)
+ return expand_call (exp, target, ignore);
-static rtx
-expand_builtin_atomic_store (machine_mode mode, tree exp)
-{
- rtx mem, val;
- enum memmodel model;
+ /* The built-in function expanders test for target == const0_rtx
+ to determine whether the function's result will be ignored. */
+ if (ignore)
+ target = const0_rtx;
- model = get_memmodel (CALL_EXPR_ARG (exp, 2));
- if (!(is_mm_relaxed (model) || is_mm_seq_cst (model)
- || is_mm_release (model)))
+ /* If the result of a pure or const built-in function is ignored, and
+ none of its arguments are volatile, we can avoid expanding the
+ built-in call and just evaluate the arguments for side-effects. */
+ if (target == const0_rtx
+ && ((flags = flags_from_decl_or_type (fndecl)) & (ECF_CONST | ECF_PURE))
+ && !(flags & ECF_LOOPING_CONST_OR_PURE))
{
- location_t loc
- = expansion_point_location_if_in_system_header (input_location);
- warning_at (loc, OPT_Winvalid_memory_model,
- "invalid memory model for %<__atomic_store%>");
- model = MEMMODEL_SEQ_CST;
- }
-
- if (!flag_inline_atomics)
- return NULL_RTX;
-
- /* Expand the operands. */
- mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
- val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);
+ bool volatilep = false;
+ tree arg;
+ call_expr_arg_iterator iter;
- return expand_atomic_store (mem, val, model, false);
-}
+ FOR_EACH_CALL_EXPR_ARG (arg, iter, exp)
+ if (TREE_THIS_VOLATILE (arg))
+ {
+ volatilep = true;
+ break;
+ }
-/* Expand the __atomic_fetch_XXX intrinsic:
- TYPE __atomic_fetch_XXX (TYPE *object, TYPE val, enum memmodel)
- EXP is the CALL_EXPR.
- TARGET is an optional place for us to store the results.
- CODE is the operation, PLUS, MINUS, ADD, XOR, or IOR.
- FETCH_AFTER is true if returning the result of the operation.
- FETCH_AFTER is false if returning the value before the operation.
- IGNORE is true if the result is not used.
- EXT_CALL is the correct builtin for an external call if this cannot be
- resolved to an instruction sequence. */
+ if (! volatilep)
+ {
+ FOR_EACH_CALL_EXPR_ARG (arg, iter, exp)
+ expand_expr (arg, const0_rtx, VOIDmode, EXPAND_NORMAL);
+ return const0_rtx;
+ }
+ }
-static rtx
-expand_builtin_atomic_fetch_op (machine_mode mode, tree exp, rtx target,
- enum rtx_code code, bool fetch_after,
- bool ignore, enum built_in_function ext_call)
-{
- rtx val, mem, ret;
- enum memmodel model;
- tree fndecl;
- tree addr;
+ switch (fcode)
+ {
+ CASE_FLT_FN (BUILT_IN_FABS):
+ CASE_FLT_FN_FLOATN_NX (BUILT_IN_FABS):
+ case BUILT_IN_FABSD32:
+ case BUILT_IN_FABSD64:
+ case BUILT_IN_FABSD128:
+ target = expand_builtin_fabs (exp, target, subtarget);
+ if (target)
+ return target;
+ break;
- model = get_memmodel (CALL_EXPR_ARG (exp, 2));
+ CASE_FLT_FN (BUILT_IN_COPYSIGN):
+ CASE_FLT_FN_FLOATN_NX (BUILT_IN_COPYSIGN):
+ target = expand_builtin_copysign (exp, target, subtarget);
+ if (target)
+ return target;
+ break;
- /* Expand the operands. */
- mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
- val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);
+ /* Just do a normal library call if we were unable to fold
+ the values. */
+ CASE_FLT_FN (BUILT_IN_CABS):
+ break;
- /* Only try generating instructions if inlining is turned on. */
- if (flag_inline_atomics)
- {
- ret = expand_atomic_fetch_op (target, mem, val, code, model, fetch_after);
- if (ret)
- return ret;
- }
+ CASE_FLT_FN (BUILT_IN_FMA):
+ CASE_FLT_FN_FLOATN_NX (BUILT_IN_FMA):
+ target = expand_builtin_mathfn_ternary (exp, target, subtarget);
+ if (target)
+ return target;
+ break;
- /* Return if a different routine isn't needed for the library call. */
- if (ext_call == BUILT_IN_NONE)
- return NULL_RTX;
+ CASE_FLT_FN (BUILT_IN_ILOGB):
+ if (! flag_unsafe_math_optimizations)
+ break;
+ gcc_fallthrough ();
+ CASE_FLT_FN (BUILT_IN_ISINF):
+ CASE_FLT_FN (BUILT_IN_FINITE):
+ case BUILT_IN_ISFINITE:
+ case BUILT_IN_ISNORMAL:
+ target = expand_builtin_interclass_mathfn (exp, target);
+ if (target)
+ return target;
+ break;
- /* Change the call to the specified function. */
- fndecl = get_callee_fndecl (exp);
- addr = CALL_EXPR_FN (exp);
- STRIP_NOPS (addr);
+ CASE_FLT_FN (BUILT_IN_ICEIL):
+ CASE_FLT_FN (BUILT_IN_LCEIL):
+ CASE_FLT_FN (BUILT_IN_LLCEIL):
+ CASE_FLT_FN (BUILT_IN_LFLOOR):
+ CASE_FLT_FN (BUILT_IN_IFLOOR):
+ CASE_FLT_FN (BUILT_IN_LLFLOOR):
+ target = expand_builtin_int_roundingfn (exp, target);
+ if (target)
+ return target;
+ break;
- gcc_assert (TREE_OPERAND (addr, 0) == fndecl);
- TREE_OPERAND (addr, 0) = builtin_decl_explicit (ext_call);
+ CASE_FLT_FN (BUILT_IN_IRINT):
+ CASE_FLT_FN (BUILT_IN_LRINT):
+ CASE_FLT_FN (BUILT_IN_LLRINT):
+ CASE_FLT_FN (BUILT_IN_IROUND):
+ CASE_FLT_FN (BUILT_IN_LROUND):
+ CASE_FLT_FN (BUILT_IN_LLROUND):
+ target = expand_builtin_int_roundingfn_2 (exp, target);
+ if (target)
+ return target;
+ break;
- /* If we will emit code after the call, the call cannot be a tail call.
- If it is emitted as a tail call, a barrier is emitted after it, and
- then all trailing code is removed. */
- if (!ignore)
- CALL_EXPR_TAILCALL (exp) = 0;
+ CASE_FLT_FN (BUILT_IN_POWI):
+ target = expand_builtin_powi (exp, target);
+ if (target)
+ return target;
+ break;
- /* Expand the call here so we can emit trailing code. */
- ret = expand_call (exp, target, ignore);
+ CASE_FLT_FN (BUILT_IN_CEXPI):
+ target = expand_builtin_cexpi (exp, target);
+ gcc_assert (target);
+ return target;
- /* Replace the original function just in case it matters. */
- TREE_OPERAND (addr, 0) = fndecl;
+ CASE_FLT_FN (BUILT_IN_SIN):
+ CASE_FLT_FN (BUILT_IN_COS):
+ if (! flag_unsafe_math_optimizations)
+ break;
+ target = expand_builtin_mathfn_3 (exp, target, subtarget);
+ if (target)
+ return target;
+ break;
- /* Then issue the arithmetic correction to return the right result. */
- if (!ignore)
- {
- if (code == NOT)
- {
- ret = expand_simple_binop (mode, AND, ret, val, NULL_RTX, true,
- OPTAB_LIB_WIDEN);
- ret = expand_simple_unop (mode, NOT, ret, target, true);
- }
+ CASE_FLT_FN (BUILT_IN_SINCOS):
+ if (! flag_unsafe_math_optimizations)
+ break;
+ target = expand_builtin_sincos (exp);
+ if (target)
+ return target;
+ break;
+
+ case BUILT_IN_APPLY_ARGS:
+ return expand_builtin_apply_args ();
+
+ /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
+ FUNCTION with a copy of the parameters described by
+ ARGUMENTS, and ARGSIZE. It returns a block of memory
+ allocated on the stack into which is stored all the registers
+ that might possibly be used for returning the result of a
+ function. ARGUMENTS is the value returned by
+ __builtin_apply_args. ARGSIZE is the number of bytes of
+ arguments that must be copied. ??? How should this value be
+ computed? We'll also need a safe worst case value for varargs
+ functions. */
+ case BUILT_IN_APPLY:
+ if (!validate_arglist (exp, POINTER_TYPE,
+ POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
+ && !validate_arglist (exp, REFERENCE_TYPE,
+ POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ return const0_rtx;
else
- ret = expand_simple_binop (mode, code, ret, val, target, true,
- OPTAB_LIB_WIDEN);
- }
- return ret;
-}
+ {
+ rtx ops[3];
-/* Expand IFN_ATOMIC_BIT_TEST_AND_* internal function. */
+ ops[0] = expand_normal (CALL_EXPR_ARG (exp, 0));
+ ops[1] = expand_normal (CALL_EXPR_ARG (exp, 1));
+ ops[2] = expand_normal (CALL_EXPR_ARG (exp, 2));
-void
-expand_ifn_atomic_bit_test_and (gcall *call)
-{
- tree ptr = gimple_call_arg (call, 0);
- tree bit = gimple_call_arg (call, 1);
- tree flag = gimple_call_arg (call, 2);
- tree lhs = gimple_call_lhs (call);
- enum memmodel model = MEMMODEL_SYNC_SEQ_CST;
- machine_mode mode = TYPE_MODE (TREE_TYPE (flag));
- enum rtx_code code;
- optab optab;
- class expand_operand ops[5];
+ return expand_builtin_apply (ops[0], ops[1], ops[2]);
+ }
- gcc_assert (flag_inline_atomics);
+ /* __builtin_return (RESULT) causes the function to return the
+ value described by RESULT. RESULT is address of the block of
+ memory returned by __builtin_apply. */
+ case BUILT_IN_RETURN:
+ if (validate_arglist (exp, POINTER_TYPE, VOID_TYPE))
+ expand_builtin_return (expand_normal (CALL_EXPR_ARG (exp, 0)));
+ return const0_rtx;
- if (gimple_call_num_args (call) == 4)
- model = get_memmodel (gimple_call_arg (call, 3));
+ case BUILT_IN_SAVEREGS:
+ return expand_builtin_saveregs ();
- rtx mem = get_builtin_sync_mem (ptr, mode);
- rtx val = expand_expr_force_mode (bit, mode);
+ case BUILT_IN_VA_ARG_PACK:
+ /* All valid uses of __builtin_va_arg_pack () are removed during
+ inlining. */
+ error ("invalid use of %<__builtin_va_arg_pack ()%>");
+ return const0_rtx;
- switch (gimple_call_internal_fn (call))
- {
- case IFN_ATOMIC_BIT_TEST_AND_SET:
- code = IOR;
- optab = atomic_bit_test_and_set_optab;
- break;
- case IFN_ATOMIC_BIT_TEST_AND_COMPLEMENT:
- code = XOR;
- optab = atomic_bit_test_and_complement_optab;
- break;
- case IFN_ATOMIC_BIT_TEST_AND_RESET:
- code = AND;
- optab = atomic_bit_test_and_reset_optab;
- break;
- default:
- gcc_unreachable ();
- }
+ case BUILT_IN_VA_ARG_PACK_LEN:
+ /* All valid uses of __builtin_va_arg_pack_len () are removed during
+ inlining. */
+ error ("invalid use of %<__builtin_va_arg_pack_len ()%>");
+ return const0_rtx;
- if (lhs == NULL_TREE)
- {
- val = expand_simple_binop (mode, ASHIFT, const1_rtx,
- val, NULL_RTX, true, OPTAB_DIRECT);
- if (code == AND)
- val = expand_simple_unop (mode, NOT, val, NULL_RTX, true);
- expand_atomic_fetch_op (const0_rtx, mem, val, code, model, false);
- return;
- }
+ /* Return the address of the first anonymous stack arg. */
+ case BUILT_IN_NEXT_ARG:
+ if (fold_builtin_next_arg (exp, false))
+ return const0_rtx;
+ return expand_builtin_next_arg ();
- rtx target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
- enum insn_code icode = direct_optab_handler (optab, mode);
- gcc_assert (icode != CODE_FOR_nothing);
- create_output_operand (&ops[0], target, mode);
- create_fixed_operand (&ops[1], mem);
- create_convert_operand_to (&ops[2], val, mode, true);
- create_integer_operand (&ops[3], model);
- create_integer_operand (&ops[4], integer_onep (flag));
- if (maybe_expand_insn (icode, 5, ops))
- return;
+ case BUILT_IN_CLEAR_CACHE:
+ expand_builtin___clear_cache (exp);
+ return const0_rtx;
- rtx bitval = val;
- val = expand_simple_binop (mode, ASHIFT, const1_rtx,
- val, NULL_RTX, true, OPTAB_DIRECT);
- rtx maskval = val;
- if (code == AND)
- val = expand_simple_unop (mode, NOT, val, NULL_RTX, true);
- rtx result = expand_atomic_fetch_op (gen_reg_rtx (mode), mem, val,
- code, model, false);
- if (integer_onep (flag))
- {
- result = expand_simple_binop (mode, ASHIFTRT, result, bitval,
- NULL_RTX, true, OPTAB_DIRECT);
- result = expand_simple_binop (mode, AND, result, const1_rtx, target,
- true, OPTAB_DIRECT);
- }
- else
- result = expand_simple_binop (mode, AND, result, maskval, target, true,
- OPTAB_DIRECT);
- if (result != target)
- emit_move_insn (target, result);
-}
+ case BUILT_IN_CLASSIFY_TYPE:
+ return expand_builtin_classify_type (exp);
-/* Expand an atomic clear operation.
- void _atomic_clear (BOOL *obj, enum memmodel)
- EXP is the call expression. */
+ case BUILT_IN_CONSTANT_P:
+ return const0_rtx;
-static rtx
-expand_builtin_atomic_clear (tree exp)
-{
- machine_mode mode;
- rtx mem, ret;
- enum memmodel model;
+ case BUILT_IN_FRAME_ADDRESS:
+ case BUILT_IN_RETURN_ADDRESS:
+ return expand_builtin_frame_address (fndecl, exp);
- mode = int_mode_for_size (BOOL_TYPE_SIZE, 0).require ();
- mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
- model = get_memmodel (CALL_EXPR_ARG (exp, 1));
+ /* Returns the address of the area where the structure is returned.
+ 0 otherwise. */
+ case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
+ if (call_expr_nargs (exp) != 0
+ || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl)))
+ || !MEM_P (DECL_RTL (DECL_RESULT (current_function_decl))))
+ return const0_rtx;
+ else
+ return XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0);
- if (is_mm_consume (model) || is_mm_acquire (model) || is_mm_acq_rel (model))
- {
- location_t loc
- = expansion_point_location_if_in_system_header (input_location);
- warning_at (loc, OPT_Winvalid_memory_model,
- "invalid memory model for %<__atomic_store%>");
- model = MEMMODEL_SEQ_CST;
- }
+ CASE_BUILT_IN_ALLOCA:
+ target = expand_builtin_alloca (exp);
+ if (target)
+ return target;
+ break;
- /* Try issuing an __atomic_store, and allow fallback to __sync_lock_release.
- Failing that, a store is issued by __atomic_store. The only way this can
- fail is if the bool type is larger than a word size. Unlikely, but
- handle it anyway for completeness. Assume a single threaded model since
- there is no atomic support in this case, and no barriers are required. */
- ret = expand_atomic_store (mem, const0_rtx, model, true);
- if (!ret)
- emit_move_insn (mem, const0_rtx);
- return const0_rtx;
-}
+ case BUILT_IN_ASAN_ALLOCAS_UNPOISON:
+ return expand_asan_emit_allocas_unpoison (exp);
-/* Expand an atomic test_and_set operation.
- bool _atomic_test_and_set (BOOL *obj, enum memmodel)
- EXP is the call expression. */
+ case BUILT_IN_STACK_SAVE:
+ return expand_stack_save ();
-static rtx
-expand_builtin_atomic_test_and_set (tree exp, rtx target)
-{
- rtx mem;
- enum memmodel model;
- machine_mode mode;
+ case BUILT_IN_STACK_RESTORE:
+ expand_stack_restore (CALL_EXPR_ARG (exp, 0));
+ return const0_rtx;
- mode = int_mode_for_size (BOOL_TYPE_SIZE, 0).require ();
- mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
- model = get_memmodel (CALL_EXPR_ARG (exp, 1));
+ case BUILT_IN_BSWAP16:
+ case BUILT_IN_BSWAP32:
+ case BUILT_IN_BSWAP64:
+ case BUILT_IN_BSWAP128:
+ target = expand_builtin_bswap (target_mode, exp, target, subtarget);
+ if (target)
+ return target;
+ break;
- return expand_atomic_test_and_set (target, mem, model);
-}
+ CASE_INT_FN (BUILT_IN_FFS):
+ target = expand_builtin_unop (target_mode, exp, target,
+ subtarget, ffs_optab);
+ if (target)
+ return target;
+ break;
+ CASE_INT_FN (BUILT_IN_CLZ):
+ target = expand_builtin_unop (target_mode, exp, target,
+ subtarget, clz_optab);
+ if (target)
+ return target;
+ break;
-/* Return true if (optional) argument ARG1 of size ARG0 is always lock free on
- this architecture. If ARG1 is NULL, use typical alignment for size ARG0. */
+ CASE_INT_FN (BUILT_IN_CTZ):
+ target = expand_builtin_unop (target_mode, exp, target,
+ subtarget, ctz_optab);
+ if (target)
+ return target;
+ break;
-static tree
-fold_builtin_atomic_always_lock_free (tree arg0, tree arg1)
-{
- int size;
- machine_mode mode;
- unsigned int mode_align, type_align;
+ CASE_INT_FN (BUILT_IN_CLRSB):
+ target = expand_builtin_unop (target_mode, exp, target,
+ subtarget, clrsb_optab);
+ if (target)
+ return target;
+ break;
- if (TREE_CODE (arg0) != INTEGER_CST)
- return NULL_TREE;
+ CASE_INT_FN (BUILT_IN_POPCOUNT):
+ target = expand_builtin_unop (target_mode, exp, target,
+ subtarget, popcount_optab);
+ if (target)
+ return target;
+ break;
- /* We need a corresponding integer mode for the access to be lock-free. */
- size = INTVAL (expand_normal (arg0)) * BITS_PER_UNIT;
- if (!int_mode_for_size (size, 0).exists (&mode))
- return boolean_false_node;
+ CASE_INT_FN (BUILT_IN_PARITY):
+ target = expand_builtin_unop (target_mode, exp, target,
+ subtarget, parity_optab);
+ if (target)
+ return target;
+ break;
- mode_align = GET_MODE_ALIGNMENT (mode);
+ case BUILT_IN_STRLEN:
+ target = expand_builtin_strlen (exp, target, target_mode);
+ if (target)
+ return target;
+ break;
- if (TREE_CODE (arg1) == INTEGER_CST)
- {
- unsigned HOST_WIDE_INT val = UINTVAL (expand_normal (arg1));
+ case BUILT_IN_STRNLEN:
+ target = expand_builtin_strnlen (exp, target, target_mode);
+ if (target)
+ return target;
+ break;
- /* Either this argument is null, or it's a fake pointer encoding
- the alignment of the object. */
- val = least_bit_hwi (val);
- val *= BITS_PER_UNIT;
+ case BUILT_IN_STRCAT:
+ target = expand_builtin_strcat (exp);
+ if (target)
+ return target;
+ break;
- if (val == 0 || mode_align < val)
- type_align = mode_align;
- else
- type_align = val;
- }
- else
- {
- tree ttype = TREE_TYPE (arg1);
+ case BUILT_IN_GETTEXT:
+ case BUILT_IN_PUTS:
+ case BUILT_IN_PUTS_UNLOCKED:
+ case BUILT_IN_STRDUP:
+ if (validate_arglist (exp, POINTER_TYPE, VOID_TYPE))
+ check_read_access (exp, CALL_EXPR_ARG (exp, 0));
+ break;
- /* This function is usually invoked and folded immediately by the front
- end before anything else has a chance to look at it. The pointer
- parameter at this point is usually cast to a void *, so check for that
- and look past the cast. */
- if (CONVERT_EXPR_P (arg1)
- && POINTER_TYPE_P (ttype)
- && VOID_TYPE_P (TREE_TYPE (ttype))
- && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (arg1, 0))))
- arg1 = TREE_OPERAND (arg1, 0);
+ case BUILT_IN_INDEX:
+ case BUILT_IN_RINDEX:
+ case BUILT_IN_STRCHR:
+ case BUILT_IN_STRRCHR:
+ if (validate_arglist (exp, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ check_read_access (exp, CALL_EXPR_ARG (exp, 0));
+ break;
- ttype = TREE_TYPE (arg1);
- gcc_assert (POINTER_TYPE_P (ttype));
+ case BUILT_IN_FPUTS:
+ case BUILT_IN_FPUTS_UNLOCKED:
+ if (validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
+ check_read_access (exp, CALL_EXPR_ARG (exp, 0));
+ break;
- /* Get the underlying type of the object. */
- ttype = TREE_TYPE (ttype);
- type_align = TYPE_ALIGN (ttype);
- }
+ case BUILT_IN_STRNDUP:
+ if (validate_arglist (exp, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ check_read_access (exp, CALL_EXPR_ARG (exp, 0), CALL_EXPR_ARG (exp, 1));
+ break;
- /* If the object has smaller alignment, the lock free routines cannot
- be used. */
- if (type_align < mode_align)
- return boolean_false_node;
+ case BUILT_IN_STRCASECMP:
+ case BUILT_IN_STRPBRK:
+ case BUILT_IN_STRSPN:
+ case BUILT_IN_STRCSPN:
+ case BUILT_IN_STRSTR:
+ if (validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
+ {
+ check_read_access (exp, CALL_EXPR_ARG (exp, 0));
+ check_read_access (exp, CALL_EXPR_ARG (exp, 1));
+ }
+ break;
- /* Check if a compare_and_swap pattern exists for the mode which represents
- the required size. The pattern is not allowed to fail, so the existence
- of the pattern indicates support is present. Also require that an
- atomic load exists for the required size. */
- if (can_compare_and_swap_p (mode, true) && can_atomic_load_p (mode))
- return boolean_true_node;
- else
- return boolean_false_node;
-}
-
-/* Return true if the parameters to call EXP represent an object which will
- always generate lock free instructions. The first argument represents the
- size of the object, and the second parameter is a pointer to the object
- itself. If NULL is passed for the object, then the result is based on
- typical alignment for an object of the specified size. Otherwise return
- false. */
+ case BUILT_IN_STRCPY:
+ target = expand_builtin_strcpy (exp, target);
+ if (target)
+ return target;
+ break;
-static rtx
-expand_builtin_atomic_always_lock_free (tree exp)
-{
- tree size;
- tree arg0 = CALL_EXPR_ARG (exp, 0);
- tree arg1 = CALL_EXPR_ARG (exp, 1);
+ case BUILT_IN_STRNCAT:
+ target = expand_builtin_strncat (exp, target);
+ if (target)
+ return target;
+ break;
- if (TREE_CODE (arg0) != INTEGER_CST)
- {
- error ("non-constant argument 1 to %qs", "__atomic_always_lock_free");
- return const0_rtx;
- }
+ case BUILT_IN_STRNCPY:
+ target = expand_builtin_strncpy (exp, target);
+ if (target)
+ return target;
+ break;
- size = fold_builtin_atomic_always_lock_free (arg0, arg1);
- if (size == boolean_true_node)
- return const1_rtx;
- return const0_rtx;
-}
+ case BUILT_IN_STPCPY:
+ target = expand_builtin_stpcpy (exp, target, mode);
+ if (target)
+ return target;
+ break;
-/* Return a one or zero if it can be determined that object ARG1 of size ARG
- is lock free on this architecture. */
+ case BUILT_IN_STPNCPY:
+ target = expand_builtin_stpncpy (exp, target);
+ if (target)
+ return target;
+ break;
-static tree
-fold_builtin_atomic_is_lock_free (tree arg0, tree arg1)
-{
- if (!flag_inline_atomics)
- return NULL_TREE;
-
- /* If it isn't always lock free, don't generate a result. */
- if (fold_builtin_atomic_always_lock_free (arg0, arg1) == boolean_true_node)
- return boolean_true_node;
+ case BUILT_IN_MEMCHR:
+ target = expand_builtin_memchr (exp, target);
+ if (target)
+ return target;
+ break;
- return NULL_TREE;
-}
+ case BUILT_IN_MEMCPY:
+ target = expand_builtin_memcpy (exp, target);
+ if (target)
+ return target;
+ break;
-/* Return true if the parameters to call EXP represent an object which will
- always generate lock free instructions. The first argument represents the
- size of the object, and the second parameter is a pointer to the object
- itself. If NULL is passed for the object, then the result is based on
- typical alignment for an object of the specified size. Otherwise return
- NULL*/
+ case BUILT_IN_MEMMOVE:
+ target = expand_builtin_memmove (exp, target);
+ if (target)
+ return target;
+ break;
-static rtx
-expand_builtin_atomic_is_lock_free (tree exp)
-{
- tree size;
- tree arg0 = CALL_EXPR_ARG (exp, 0);
- tree arg1 = CALL_EXPR_ARG (exp, 1);
+ case BUILT_IN_MEMPCPY:
+ target = expand_builtin_mempcpy (exp, target);
+ if (target)
+ return target;
+ break;
- if (!INTEGRAL_TYPE_P (TREE_TYPE (arg0)))
- {
- error ("non-integer argument 1 to %qs", "__atomic_is_lock_free");
- return NULL_RTX;
- }
+ case BUILT_IN_MEMSET:
+ target = expand_builtin_memset (exp, target, mode);
+ if (target)
+ return target;
+ break;
- if (!flag_inline_atomics)
- return NULL_RTX;
+ case BUILT_IN_BZERO:
+ target = expand_builtin_bzero (exp);
+ if (target)
+ return target;
+ break;
- /* If the value is known at compile time, return the RTX for it. */
- size = fold_builtin_atomic_is_lock_free (arg0, arg1);
- if (size == boolean_true_node)
- return const1_rtx;
+ /* Expand it as BUILT_IN_MEMCMP_EQ first. If not successful, change it
+ back to a BUILT_IN_STRCMP. Remember to delete the 3rd parameter
+ when changing it to a strcmp call. */
+ case BUILT_IN_STRCMP_EQ:
+ target = expand_builtin_memcmp (exp, target, true);
+ if (target)
+ return target;
- return NULL_RTX;
-}
+ /* Change this call back to a BUILT_IN_STRCMP. */
+ TREE_OPERAND (exp, 1)
+ = build_fold_addr_expr (builtin_decl_explicit (BUILT_IN_STRCMP));
-/* Expand the __atomic_thread_fence intrinsic:
- void __atomic_thread_fence (enum memmodel)
- EXP is the CALL_EXPR. */
+ /* Delete the last parameter. */
+ unsigned int i;
+ vec<tree, va_gc> *arg_vec;
+ vec_alloc (arg_vec, 2);
+ for (i = 0; i < 2; i++)
+ arg_vec->quick_push (CALL_EXPR_ARG (exp, i));
+ exp = build_call_vec (TREE_TYPE (exp), CALL_EXPR_FN (exp), arg_vec);
+ /* FALLTHROUGH */
-static void
-expand_builtin_atomic_thread_fence (tree exp)
-{
- enum memmodel model = get_memmodel (CALL_EXPR_ARG (exp, 0));
- expand_mem_thread_fence (model);
-}
+ case BUILT_IN_STRCMP:
+ target = expand_builtin_strcmp (exp, target);
+ if (target)
+ return target;
+ break;
-/* Expand the __atomic_signal_fence intrinsic:
- void __atomic_signal_fence (enum memmodel)
- EXP is the CALL_EXPR. */
+ /* Expand it as BUILT_IN_MEMCMP_EQ first. If not successful, change it
+ back to a BUILT_IN_STRNCMP. */
+ case BUILT_IN_STRNCMP_EQ:
+ target = expand_builtin_memcmp (exp, target, true);
+ if (target)
+ return target;
-static void
-expand_builtin_atomic_signal_fence (tree exp)
-{
- enum memmodel model = get_memmodel (CALL_EXPR_ARG (exp, 0));
- expand_mem_signal_fence (model);
-}
+ /* Change it back to a BUILT_IN_STRNCMP. */
+ TREE_OPERAND (exp, 1)
+ = build_fold_addr_expr (builtin_decl_explicit (BUILT_IN_STRNCMP));
+ /* FALLTHROUGH */
-/* Expand the __sync_synchronize intrinsic. */
+ case BUILT_IN_STRNCMP:
+ target = expand_builtin_strncmp (exp, target, mode);
+ if (target)
+ return target;
+ break;
-static void
-expand_builtin_sync_synchronize (void)
-{
- expand_mem_thread_fence (MEMMODEL_SYNC_SEQ_CST);
-}
+ case BUILT_IN_BCMP:
+ case BUILT_IN_MEMCMP:
+ case BUILT_IN_MEMCMP_EQ:
+ target = expand_builtin_memcmp (exp, target, fcode == BUILT_IN_MEMCMP_EQ);
+ if (target)
+ return target;
+ if (fcode == BUILT_IN_MEMCMP_EQ)
+ {
+ tree newdecl = builtin_decl_explicit (BUILT_IN_MEMCMP);
+ TREE_OPERAND (exp, 1) = build_fold_addr_expr (newdecl);
+ }
+ break;
-static rtx
-expand_builtin_thread_pointer (tree exp, rtx target)
-{
- enum insn_code icode;
- if (!validate_arglist (exp, VOID_TYPE))
- return const0_rtx;
- icode = direct_optab_handler (get_thread_pointer_optab, Pmode);
- if (icode != CODE_FOR_nothing)
- {
- class expand_operand op;
- /* If the target is not sutitable then create a new target. */
- if (target == NULL_RTX
- || !REG_P (target)
- || GET_MODE (target) != Pmode)
- target = gen_reg_rtx (Pmode);
- create_output_operand (&op, target, Pmode);
- expand_insn (icode, 1, &op);
- return target;
- }
- error ("%<__builtin_thread_pointer%> is not supported on this target");
- return const0_rtx;
-}
+ case BUILT_IN_SETJMP:
+ /* This should have been lowered to the builtins below. */
+ gcc_unreachable ();
-static void
-expand_builtin_set_thread_pointer (tree exp)
-{
- enum insn_code icode;
- if (!validate_arglist (exp, POINTER_TYPE, VOID_TYPE))
- return;
- icode = direct_optab_handler (set_thread_pointer_optab, Pmode);
- if (icode != CODE_FOR_nothing)
- {
- class expand_operand op;
- rtx val = expand_expr (CALL_EXPR_ARG (exp, 0), NULL_RTX,
- Pmode, EXPAND_NORMAL);
- create_input_operand (&op, val, Pmode);
- expand_insn (icode, 1, &op);
- return;
- }
- error ("%<__builtin_set_thread_pointer%> is not supported on this target");
-}
+ case BUILT_IN_SETJMP_SETUP:
+ /* __builtin_setjmp_setup is passed a pointer to an array of five words
+ and the receiver label. */
+ if (validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
+ {
+ rtx buf_addr = expand_expr (CALL_EXPR_ARG (exp, 0), subtarget,
+ VOIDmode, EXPAND_NORMAL);
+ tree label = TREE_OPERAND (CALL_EXPR_ARG (exp, 1), 0);
+ rtx_insn *label_r = label_rtx (label);
-\f
-/* Emit code to restore the current value of stack. */
+ /* This is copied from the handling of non-local gotos. */
+ expand_builtin_setjmp_setup (buf_addr, label_r);
+ nonlocal_goto_handler_labels
+ = gen_rtx_INSN_LIST (VOIDmode, label_r,
+ nonlocal_goto_handler_labels);
+ /* ??? Do not let expand_label treat us as such since we would
+ not want to be both on the list of non-local labels and on
+ the list of forced labels. */
+ FORCED_LABEL (label) = 0;
+ return const0_rtx;
+ }
+ break;
-static void
-expand_stack_restore (tree var)
-{
- rtx_insn *prev;
- rtx sa = expand_normal (var);
-
- sa = convert_memory_address (Pmode, sa);
-
- prev = get_last_insn ();
- emit_stack_restore (SAVE_BLOCK, sa);
+ case BUILT_IN_SETJMP_RECEIVER:
+ /* __builtin_setjmp_receiver is passed the receiver label. */
+ if (validate_arglist (exp, POINTER_TYPE, VOID_TYPE))
+ {
+ tree label = TREE_OPERAND (CALL_EXPR_ARG (exp, 0), 0);
+ rtx_insn *label_r = label_rtx (label);
- record_new_stack_level ();
+ expand_builtin_setjmp_receiver (label_r);
+ return const0_rtx;
+ }
+ break;
- fixup_args_size_notes (prev, get_last_insn (), 0);
-}
+ /* __builtin_longjmp is passed a pointer to an array of five words.
+ It's similar to the C library longjmp function but works with
+ __builtin_setjmp above. */
+ case BUILT_IN_LONGJMP:
+ if (validate_arglist (exp, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ {
+ rtx buf_addr = expand_expr (CALL_EXPR_ARG (exp, 0), subtarget,
+ VOIDmode, EXPAND_NORMAL);
+ rtx value = expand_normal (CALL_EXPR_ARG (exp, 1));
-/* Emit code to save the current value of stack. */
+ if (value != const1_rtx)
+ {
+ error ("%<__builtin_longjmp%> second argument must be 1");
+ return const0_rtx;
+ }
-static rtx
-expand_stack_save (void)
-{
- rtx ret = NULL_RTX;
+ expand_builtin_longjmp (buf_addr, value);
+ return const0_rtx;
+ }
+ break;
- emit_stack_save (SAVE_BLOCK, &ret);
- return ret;
-}
+ case BUILT_IN_NONLOCAL_GOTO:
+ target = expand_builtin_nonlocal_goto (exp);
+ if (target)
+ return target;
+ break;
-/* Emit code to get the openacc gang, worker or vector id or size. */
+ /* This updates the setjmp buffer that is its argument with the value
+ of the current stack pointer. */
+ case BUILT_IN_UPDATE_SETJMP_BUF:
+ if (validate_arglist (exp, POINTER_TYPE, VOID_TYPE))
+ {
+ rtx buf_addr
+ = expand_normal (CALL_EXPR_ARG (exp, 0));
-static rtx
-expand_builtin_goacc_parlevel_id_size (tree exp, rtx target, int ignore)
-{
- const char *name;
- rtx fallback_retval;
- rtx_insn *(*gen_fn) (rtx, rtx);
- switch (DECL_FUNCTION_CODE (get_callee_fndecl (exp)))
- {
- case BUILT_IN_GOACC_PARLEVEL_ID:
- name = "__builtin_goacc_parlevel_id";
- fallback_retval = const0_rtx;
- gen_fn = targetm.gen_oacc_dim_pos;
- break;
- case BUILT_IN_GOACC_PARLEVEL_SIZE:
- name = "__builtin_goacc_parlevel_size";
- fallback_retval = const1_rtx;
- gen_fn = targetm.gen_oacc_dim_size;
+ expand_builtin_update_setjmp_buf (buf_addr);
+ return const0_rtx;
+ }
break;
- default:
- gcc_unreachable ();
- }
- if (oacc_get_fn_attrib (current_function_decl) == NULL_TREE)
- {
- error ("%qs only supported in OpenACC code", name);
+ case BUILT_IN_TRAP:
+ expand_builtin_trap ();
return const0_rtx;
- }
- tree arg = CALL_EXPR_ARG (exp, 0);
- if (TREE_CODE (arg) != INTEGER_CST)
- {
- error ("non-constant argument 0 to %qs", name);
+ case BUILT_IN_UNREACHABLE:
+ expand_builtin_unreachable ();
return const0_rtx;
- }
- int dim = TREE_INT_CST_LOW (arg);
- switch (dim)
- {
- case GOMP_DIM_GANG:
- case GOMP_DIM_WORKER:
- case GOMP_DIM_VECTOR:
+ CASE_FLT_FN (BUILT_IN_SIGNBIT):
+ case BUILT_IN_SIGNBITD32:
+ case BUILT_IN_SIGNBITD64:
+ case BUILT_IN_SIGNBITD128:
+ target = expand_builtin_signbit (exp, target);
+ if (target)
+ return target;
break;
- default:
- error ("illegal argument 0 to %qs", name);
- return const0_rtx;
- }
- if (ignore)
- return target;
+ /* Various hooks for the DWARF 2 __throw routine. */
+ case BUILT_IN_UNWIND_INIT:
+ expand_builtin_unwind_init ();
+ return const0_rtx;
+ case BUILT_IN_DWARF_CFA:
+ return virtual_cfa_rtx;
+#ifdef DWARF2_UNWIND_INFO
+ case BUILT_IN_DWARF_SP_COLUMN:
+ return expand_builtin_dwarf_sp_column ();
+ case BUILT_IN_INIT_DWARF_REG_SIZES:
+ expand_builtin_init_dwarf_reg_sizes (CALL_EXPR_ARG (exp, 0));
+ return const0_rtx;
+#endif
+ case BUILT_IN_FROB_RETURN_ADDR:
+ return expand_builtin_frob_return_addr (CALL_EXPR_ARG (exp, 0));
+ case BUILT_IN_EXTRACT_RETURN_ADDR:
+ return expand_builtin_extract_return_addr (CALL_EXPR_ARG (exp, 0));
+ case BUILT_IN_EH_RETURN:
+ expand_builtin_eh_return (CALL_EXPR_ARG (exp, 0),
+ CALL_EXPR_ARG (exp, 1));
+ return const0_rtx;
+ case BUILT_IN_EH_RETURN_DATA_REGNO:
+ return expand_builtin_eh_return_data_regno (exp);
+ case BUILT_IN_EXTEND_POINTER:
+ return expand_builtin_extend_pointer (CALL_EXPR_ARG (exp, 0));
+ case BUILT_IN_EH_POINTER:
+ return expand_builtin_eh_pointer (exp);
+ case BUILT_IN_EH_FILTER:
+ return expand_builtin_eh_filter (exp);
+ case BUILT_IN_EH_COPY_VALUES:
+ return expand_builtin_eh_copy_values (exp);
- if (target == NULL_RTX)
- target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
+ case BUILT_IN_VA_START:
+ return expand_builtin_va_start (exp);
+ case BUILT_IN_VA_END:
+ return expand_builtin_va_end (exp);
+ case BUILT_IN_VA_COPY:
+ return expand_builtin_va_copy (exp);
+ case BUILT_IN_EXPECT:
+ return expand_builtin_expect (exp, target);
+ case BUILT_IN_EXPECT_WITH_PROBABILITY:
+ return expand_builtin_expect_with_probability (exp, target);
+ case BUILT_IN_ASSUME_ALIGNED:
+ return expand_builtin_assume_aligned (exp, target);
+ case BUILT_IN_PREFETCH:
+ expand_builtin_prefetch (exp);
+ return const0_rtx;
- if (!targetm.have_oacc_dim_size ())
- {
- emit_move_insn (target, fallback_retval);
- return target;
- }
+ case BUILT_IN_INIT_TRAMPOLINE:
+ return expand_builtin_init_trampoline (exp, true);
+ case BUILT_IN_INIT_HEAP_TRAMPOLINE:
+ return expand_builtin_init_trampoline (exp, false);
+ case BUILT_IN_ADJUST_TRAMPOLINE:
+ return expand_builtin_adjust_trampoline (exp);
- rtx reg = MEM_P (target) ? gen_reg_rtx (GET_MODE (target)) : target;
- emit_insn (gen_fn (reg, GEN_INT (dim)));
- if (reg != target)
- emit_move_insn (target, reg);
+ case BUILT_IN_INIT_DESCRIPTOR:
+ return expand_builtin_init_descriptor (exp);
+ case BUILT_IN_ADJUST_DESCRIPTOR:
+ return expand_builtin_adjust_descriptor (exp);
- return target;
-}
+ case BUILT_IN_FORK:
+ case BUILT_IN_EXECL:
+ case BUILT_IN_EXECV:
+ case BUILT_IN_EXECLP:
+ case BUILT_IN_EXECLE:
+ case BUILT_IN_EXECVP:
+ case BUILT_IN_EXECVE:
+ target = expand_builtin_fork_or_exec (fndecl, exp, target, ignore);
+ if (target)
+ return target;
+ break;
-/* Expand a string compare operation using a sequence of char comparison
- to get rid of the calling overhead, with result going to TARGET if
- that's convenient.
+ case BUILT_IN_SYNC_FETCH_AND_ADD_1:
+ case BUILT_IN_SYNC_FETCH_AND_ADD_2:
+ case BUILT_IN_SYNC_FETCH_AND_ADD_4:
+ case BUILT_IN_SYNC_FETCH_AND_ADD_8:
+ case BUILT_IN_SYNC_FETCH_AND_ADD_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_FETCH_AND_ADD_1);
+ target = expand_builtin_sync_operation (mode, exp, PLUS, false, target);
+ if (target)
+ return target;
+ break;
- VAR_STR is the variable string source;
- CONST_STR is the constant string source;
- LENGTH is the number of chars to compare;
- CONST_STR_N indicates which source string is the constant string;
- IS_MEMCMP indicates whether it's a memcmp or strcmp.
-
- to: (assume const_str_n is 2, i.e., arg2 is a constant string)
+ case BUILT_IN_SYNC_FETCH_AND_SUB_1:
+ case BUILT_IN_SYNC_FETCH_AND_SUB_2:
+ case BUILT_IN_SYNC_FETCH_AND_SUB_4:
+ case BUILT_IN_SYNC_FETCH_AND_SUB_8:
+ case BUILT_IN_SYNC_FETCH_AND_SUB_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_FETCH_AND_SUB_1);
+ target = expand_builtin_sync_operation (mode, exp, MINUS, false, target);
+ if (target)
+ return target;
+ break;
- target = (int) (unsigned char) var_str[0]
- - (int) (unsigned char) const_str[0];
- if (target != 0)
- goto ne_label;
- ...
- target = (int) (unsigned char) var_str[length - 2]
- - (int) (unsigned char) const_str[length - 2];
- if (target != 0)
- goto ne_label;
- target = (int) (unsigned char) var_str[length - 1]
- - (int) (unsigned char) const_str[length - 1];
- ne_label:
- */
+ case BUILT_IN_SYNC_FETCH_AND_OR_1:
+ case BUILT_IN_SYNC_FETCH_AND_OR_2:
+ case BUILT_IN_SYNC_FETCH_AND_OR_4:
+ case BUILT_IN_SYNC_FETCH_AND_OR_8:
+ case BUILT_IN_SYNC_FETCH_AND_OR_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_FETCH_AND_OR_1);
+ target = expand_builtin_sync_operation (mode, exp, IOR, false, target);
+ if (target)
+ return target;
+ break;
-static rtx
-inline_string_cmp (rtx target, tree var_str, const char *const_str,
- unsigned HOST_WIDE_INT length,
- int const_str_n, machine_mode mode)
-{
- HOST_WIDE_INT offset = 0;
- rtx var_rtx_array
- = get_memory_rtx (var_str, build_int_cst (unsigned_type_node,length));
- rtx var_rtx = NULL_RTX;
- rtx const_rtx = NULL_RTX;
- rtx result = target ? target : gen_reg_rtx (mode);
- rtx_code_label *ne_label = gen_label_rtx ();
- tree unit_type_node = unsigned_char_type_node;
- scalar_int_mode unit_mode
- = as_a <scalar_int_mode> TYPE_MODE (unit_type_node);
-
- start_sequence ();
+ case BUILT_IN_SYNC_FETCH_AND_AND_1:
+ case BUILT_IN_SYNC_FETCH_AND_AND_2:
+ case BUILT_IN_SYNC_FETCH_AND_AND_4:
+ case BUILT_IN_SYNC_FETCH_AND_AND_8:
+ case BUILT_IN_SYNC_FETCH_AND_AND_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_FETCH_AND_AND_1);
+ target = expand_builtin_sync_operation (mode, exp, AND, false, target);
+ if (target)
+ return target;
+ break;
- for (unsigned HOST_WIDE_INT i = 0; i < length; i++)
- {
- var_rtx
- = adjust_address (var_rtx_array, TYPE_MODE (unit_type_node), offset);
- const_rtx = c_readstr (const_str + offset, unit_mode);
- rtx op0 = (const_str_n == 1) ? const_rtx : var_rtx;
- rtx op1 = (const_str_n == 1) ? var_rtx : const_rtx;
+ case BUILT_IN_SYNC_FETCH_AND_XOR_1:
+ case BUILT_IN_SYNC_FETCH_AND_XOR_2:
+ case BUILT_IN_SYNC_FETCH_AND_XOR_4:
+ case BUILT_IN_SYNC_FETCH_AND_XOR_8:
+ case BUILT_IN_SYNC_FETCH_AND_XOR_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_FETCH_AND_XOR_1);
+ target = expand_builtin_sync_operation (mode, exp, XOR, false, target);
+ if (target)
+ return target;
+ break;
- op0 = convert_modes (mode, unit_mode, op0, 1);
- op1 = convert_modes (mode, unit_mode, op1, 1);
- result = expand_simple_binop (mode, MINUS, op0, op1,
- result, 1, OPTAB_WIDEN);
- if (i < length - 1)
- emit_cmp_and_jump_insns (result, CONST0_RTX (mode), NE, NULL_RTX,
- mode, true, ne_label);
- offset += GET_MODE_SIZE (unit_mode);
- }
+ case BUILT_IN_SYNC_FETCH_AND_NAND_1:
+ case BUILT_IN_SYNC_FETCH_AND_NAND_2:
+ case BUILT_IN_SYNC_FETCH_AND_NAND_4:
+ case BUILT_IN_SYNC_FETCH_AND_NAND_8:
+ case BUILT_IN_SYNC_FETCH_AND_NAND_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_FETCH_AND_NAND_1);
+ target = expand_builtin_sync_operation (mode, exp, NOT, false, target);
+ if (target)
+ return target;
+ break;
- emit_label (ne_label);
- rtx_insn *insns = get_insns ();
- end_sequence ();
- emit_insn (insns);
+ case BUILT_IN_SYNC_ADD_AND_FETCH_1:
+ case BUILT_IN_SYNC_ADD_AND_FETCH_2:
+ case BUILT_IN_SYNC_ADD_AND_FETCH_4:
+ case BUILT_IN_SYNC_ADD_AND_FETCH_8:
+ case BUILT_IN_SYNC_ADD_AND_FETCH_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_ADD_AND_FETCH_1);
+ target = expand_builtin_sync_operation (mode, exp, PLUS, true, target);
+ if (target)
+ return target;
+ break;
- return result;
-}
+ case BUILT_IN_SYNC_SUB_AND_FETCH_1:
+ case BUILT_IN_SYNC_SUB_AND_FETCH_2:
+ case BUILT_IN_SYNC_SUB_AND_FETCH_4:
+ case BUILT_IN_SYNC_SUB_AND_FETCH_8:
+ case BUILT_IN_SYNC_SUB_AND_FETCH_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_SUB_AND_FETCH_1);
+ target = expand_builtin_sync_operation (mode, exp, MINUS, true, target);
+ if (target)
+ return target;
+ break;
-/* Inline expansion of a call to str(n)cmp and memcmp, with result going
- to TARGET if that's convenient.
- If the call is not been inlined, return NULL_RTX. */
+ case BUILT_IN_SYNC_OR_AND_FETCH_1:
+ case BUILT_IN_SYNC_OR_AND_FETCH_2:
+ case BUILT_IN_SYNC_OR_AND_FETCH_4:
+ case BUILT_IN_SYNC_OR_AND_FETCH_8:
+ case BUILT_IN_SYNC_OR_AND_FETCH_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_OR_AND_FETCH_1);
+ target = expand_builtin_sync_operation (mode, exp, IOR, true, target);
+ if (target)
+ return target;
+ break;
-static rtx
-inline_expand_builtin_bytecmp (tree exp, rtx target)
-{
- tree fndecl = get_callee_fndecl (exp);
- enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
- bool is_ncmp = (fcode == BUILT_IN_STRNCMP || fcode == BUILT_IN_MEMCMP);
+ case BUILT_IN_SYNC_AND_AND_FETCH_1:
+ case BUILT_IN_SYNC_AND_AND_FETCH_2:
+ case BUILT_IN_SYNC_AND_AND_FETCH_4:
+ case BUILT_IN_SYNC_AND_AND_FETCH_8:
+ case BUILT_IN_SYNC_AND_AND_FETCH_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_AND_AND_FETCH_1);
+ target = expand_builtin_sync_operation (mode, exp, AND, true, target);
+ if (target)
+ return target;
+ break;
- /* Do NOT apply this inlining expansion when optimizing for size or
- optimization level below 2. */
- if (optimize < 2 || optimize_insn_for_size_p ())
- return NULL_RTX;
+ case BUILT_IN_SYNC_XOR_AND_FETCH_1:
+ case BUILT_IN_SYNC_XOR_AND_FETCH_2:
+ case BUILT_IN_SYNC_XOR_AND_FETCH_4:
+ case BUILT_IN_SYNC_XOR_AND_FETCH_8:
+ case BUILT_IN_SYNC_XOR_AND_FETCH_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_XOR_AND_FETCH_1);
+ target = expand_builtin_sync_operation (mode, exp, XOR, true, target);
+ if (target)
+ return target;
+ break;
- gcc_checking_assert (fcode == BUILT_IN_STRCMP
- || fcode == BUILT_IN_STRNCMP
- || fcode == BUILT_IN_MEMCMP);
+ case BUILT_IN_SYNC_NAND_AND_FETCH_1:
+ case BUILT_IN_SYNC_NAND_AND_FETCH_2:
+ case BUILT_IN_SYNC_NAND_AND_FETCH_4:
+ case BUILT_IN_SYNC_NAND_AND_FETCH_8:
+ case BUILT_IN_SYNC_NAND_AND_FETCH_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_NAND_AND_FETCH_1);
+ target = expand_builtin_sync_operation (mode, exp, NOT, true, target);
+ if (target)
+ return target;
+ break;
- /* On a target where the type of the call (int) has same or narrower presicion
- than unsigned char, give up the inlining expansion. */
- if (TYPE_PRECISION (unsigned_char_type_node)
- >= TYPE_PRECISION (TREE_TYPE (exp)))
- return NULL_RTX;
+ case BUILT_IN_SYNC_BOOL_COMPARE_AND_SWAP_1:
+ case BUILT_IN_SYNC_BOOL_COMPARE_AND_SWAP_2:
+ case BUILT_IN_SYNC_BOOL_COMPARE_AND_SWAP_4:
+ case BUILT_IN_SYNC_BOOL_COMPARE_AND_SWAP_8:
+ case BUILT_IN_SYNC_BOOL_COMPARE_AND_SWAP_16:
+ if (mode == VOIDmode)
+ mode = TYPE_MODE (boolean_type_node);
+ if (!target || !register_operand (target, mode))
+ target = gen_reg_rtx (mode);
- tree arg1 = CALL_EXPR_ARG (exp, 0);
- tree arg2 = CALL_EXPR_ARG (exp, 1);
- tree len3_tree = is_ncmp ? CALL_EXPR_ARG (exp, 2) : NULL_TREE;
+ mode = get_builtin_sync_mode
+ (fcode - BUILT_IN_SYNC_BOOL_COMPARE_AND_SWAP_1);
+ target = expand_builtin_compare_and_swap (mode, exp, true, target);
+ if (target)
+ return target;
+ break;
- unsigned HOST_WIDE_INT len1 = 0;
- unsigned HOST_WIDE_INT len2 = 0;
- unsigned HOST_WIDE_INT len3 = 0;
+ case BUILT_IN_SYNC_VAL_COMPARE_AND_SWAP_1:
+ case BUILT_IN_SYNC_VAL_COMPARE_AND_SWAP_2:
+ case BUILT_IN_SYNC_VAL_COMPARE_AND_SWAP_4:
+ case BUILT_IN_SYNC_VAL_COMPARE_AND_SWAP_8:
+ case BUILT_IN_SYNC_VAL_COMPARE_AND_SWAP_16:
+ mode = get_builtin_sync_mode
+ (fcode - BUILT_IN_SYNC_VAL_COMPARE_AND_SWAP_1);
+ target = expand_builtin_compare_and_swap (mode, exp, false, target);
+ if (target)
+ return target;
+ break;
- /* Get the object representation of the initializers of ARG1 and ARG2
- as strings, provided they refer to constant objects, with their byte
- sizes in LEN1 and LEN2, respectively. */
- const char *bytes1 = getbyterep (arg1, &len1);
- const char *bytes2 = getbyterep (arg2, &len2);
+ case BUILT_IN_SYNC_LOCK_TEST_AND_SET_1:
+ case BUILT_IN_SYNC_LOCK_TEST_AND_SET_2:
+ case BUILT_IN_SYNC_LOCK_TEST_AND_SET_4:
+ case BUILT_IN_SYNC_LOCK_TEST_AND_SET_8:
+ case BUILT_IN_SYNC_LOCK_TEST_AND_SET_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_LOCK_TEST_AND_SET_1);
+ target = expand_builtin_sync_lock_test_and_set (mode, exp, target);
+ if (target)
+ return target;
+ break;
- /* Fail if neither argument refers to an initialized constant. */
- if (!bytes1 && !bytes2)
- return NULL_RTX;
+ case BUILT_IN_SYNC_LOCK_RELEASE_1:
+ case BUILT_IN_SYNC_LOCK_RELEASE_2:
+ case BUILT_IN_SYNC_LOCK_RELEASE_4:
+ case BUILT_IN_SYNC_LOCK_RELEASE_8:
+ case BUILT_IN_SYNC_LOCK_RELEASE_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_LOCK_RELEASE_1);
+ expand_builtin_sync_lock_release (mode, exp);
+ return const0_rtx;
- if (is_ncmp)
- {
- /* Fail if the memcmp/strncmp bound is not a constant. */
- if (!tree_fits_uhwi_p (len3_tree))
- return NULL_RTX;
+ case BUILT_IN_SYNC_SYNCHRONIZE:
+ expand_builtin_sync_synchronize ();
+ return const0_rtx;
- len3 = tree_to_uhwi (len3_tree);
+ case BUILT_IN_ATOMIC_EXCHANGE_1:
+ case BUILT_IN_ATOMIC_EXCHANGE_2:
+ case BUILT_IN_ATOMIC_EXCHANGE_4:
+ case BUILT_IN_ATOMIC_EXCHANGE_8:
+ case BUILT_IN_ATOMIC_EXCHANGE_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_EXCHANGE_1);
+ target = expand_builtin_atomic_exchange (mode, exp, target);
+ if (target)
+ return target;
+ break;
- if (fcode == BUILT_IN_MEMCMP)
- {
- /* Fail if the memcmp bound is greater than the size of either
- of the two constant objects. */
- if ((bytes1 && len1 < len3)
- || (bytes2 && len2 < len3))
- return NULL_RTX;
- }
- }
+ case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_1:
+ case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_2:
+ case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_4:
+ case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_8:
+ case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_16:
+ {
+ unsigned int nargs, z;
+ vec<tree, va_gc> *vec;
- if (fcode != BUILT_IN_MEMCMP)
- {
- /* For string functions (i.e., strcmp and strncmp) reduce LEN1
- and LEN2 to the length of the nul-terminated string stored
- in each. */
- if (bytes1 != NULL)
- len1 = strnlen (bytes1, len1) + 1;
- if (bytes2 != NULL)
- len2 = strnlen (bytes2, len2) + 1;
- }
+ mode =
+ get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_COMPARE_EXCHANGE_1);
+ target = expand_builtin_atomic_compare_exchange (mode, exp, target);
+ if (target)
+ return target;
- /* See inline_string_cmp. */
- int const_str_n;
- if (!len1)
- const_str_n = 2;
- else if (!len2)
- const_str_n = 1;
- else if (len2 > len1)
- const_str_n = 1;
- else
- const_str_n = 2;
-
- /* For strncmp only, compute the new bound as the smallest of
- the lengths of the two strings (plus 1) and the bound provided
- to the function. */
- unsigned HOST_WIDE_INT bound = (const_str_n == 1) ? len1 : len2;
- if (is_ncmp && len3 < bound)
- bound = len3;
-
- /* If the bound of the comparison is larger than the threshold,
- do nothing. */
- if (bound > (unsigned HOST_WIDE_INT) param_builtin_string_cmp_inline_length)
- return NULL_RTX;
-
- machine_mode mode = TYPE_MODE (TREE_TYPE (exp));
-
- /* Now, start inline expansion the call. */
- return inline_string_cmp (target, (const_str_n == 1) ? arg2 : arg1,
- (const_str_n == 1) ? bytes1 : bytes2, bound,
- const_str_n, mode);
-}
-
-/* Expand a call to __builtin_speculation_safe_value_<N>. MODE
- represents the size of the first argument to that call, or VOIDmode
- if the argument is a pointer. IGNORE will be true if the result
- isn't used. */
-static rtx
-expand_speculation_safe_value (machine_mode mode, tree exp, rtx target,
- bool ignore)
-{
- rtx val, failsafe;
- unsigned nargs = call_expr_nargs (exp);
-
- tree arg0 = CALL_EXPR_ARG (exp, 0);
-
- if (mode == VOIDmode)
- {
- mode = TYPE_MODE (TREE_TYPE (arg0));
- gcc_assert (GET_MODE_CLASS (mode) == MODE_INT);
- }
-
- val = expand_expr (arg0, NULL_RTX, mode, EXPAND_NORMAL);
-
- /* An optional second argument can be used as a failsafe value on
- some machines. If it isn't present, then the failsafe value is
- assumed to be 0. */
- if (nargs > 1)
- {
- tree arg1 = CALL_EXPR_ARG (exp, 1);
- failsafe = expand_expr (arg1, NULL_RTX, mode, EXPAND_NORMAL);
- }
- else
- failsafe = const0_rtx;
-
- /* If the result isn't used, the behavior is undefined. It would be
- nice to emit a warning here, but path splitting means this might
- happen with legitimate code. So simply drop the builtin
- expansion in that case; we've handled any side-effects above. */
- if (ignore)
- return const0_rtx;
-
- /* If we don't have a suitable target, create one to hold the result. */
- if (target == NULL || GET_MODE (target) != mode)
- target = gen_reg_rtx (mode);
-
- if (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode)
- val = convert_modes (mode, VOIDmode, val, false);
-
- return targetm.speculation_safe_value (mode, target, val, failsafe);
-}
-
-/* Expand an expression EXP that calls a built-in function,
- with result going to TARGET if that's convenient
- (and in mode MODE if that's convenient).
- SUBTARGET may be used as the target for computing one of EXP's operands.
- IGNORE is nonzero if the value is to be ignored. */
-
-rtx
-expand_builtin (tree exp, rtx target, rtx subtarget, machine_mode mode,
- int ignore)
-{
- tree fndecl = get_callee_fndecl (exp);
- machine_mode target_mode = TYPE_MODE (TREE_TYPE (exp));
- int flags;
-
- if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
- return targetm.expand_builtin (exp, target, subtarget, mode, ignore);
-
- /* When ASan is enabled, we don't want to expand some memory/string
- builtins and rely on libsanitizer's hooks. This allows us to avoid
- redundant checks and be sure, that possible overflow will be detected
- by ASan. */
-
- enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
- if ((flag_sanitize & SANITIZE_ADDRESS) && asan_intercepted_p (fcode))
- return expand_call (exp, target, ignore);
-
- /* When not optimizing, generate calls to library functions for a certain
- set of builtins. */
- if (!optimize
- && !called_as_built_in (fndecl)
- && fcode != BUILT_IN_FORK
- && fcode != BUILT_IN_EXECL
- && fcode != BUILT_IN_EXECV
- && fcode != BUILT_IN_EXECLP
- && fcode != BUILT_IN_EXECLE
- && fcode != BUILT_IN_EXECVP
- && fcode != BUILT_IN_EXECVE
- && fcode != BUILT_IN_CLEAR_CACHE
- && !ALLOCA_FUNCTION_CODE_P (fcode)
- && fcode != BUILT_IN_FREE)
- return expand_call (exp, target, ignore);
-
- /* The built-in function expanders test for target == const0_rtx
- to determine whether the function's result will be ignored. */
- if (ignore)
- target = const0_rtx;
-
- /* If the result of a pure or const built-in function is ignored, and
- none of its arguments are volatile, we can avoid expanding the
- built-in call and just evaluate the arguments for side-effects. */
- if (target == const0_rtx
- && ((flags = flags_from_decl_or_type (fndecl)) & (ECF_CONST | ECF_PURE))
- && !(flags & ECF_LOOPING_CONST_OR_PURE))
- {
- bool volatilep = false;
- tree arg;
- call_expr_arg_iterator iter;
-
- FOR_EACH_CALL_EXPR_ARG (arg, iter, exp)
- if (TREE_THIS_VOLATILE (arg))
- {
- volatilep = true;
- break;
- }
-
- if (! volatilep)
- {
- FOR_EACH_CALL_EXPR_ARG (arg, iter, exp)
- expand_expr (arg, const0_rtx, VOIDmode, EXPAND_NORMAL);
- return const0_rtx;
- }
- }
-
- switch (fcode)
- {
- CASE_FLT_FN (BUILT_IN_FABS):
- CASE_FLT_FN_FLOATN_NX (BUILT_IN_FABS):
- case BUILT_IN_FABSD32:
- case BUILT_IN_FABSD64:
- case BUILT_IN_FABSD128:
- target = expand_builtin_fabs (exp, target, subtarget);
- if (target)
- return target;
- break;
-
- CASE_FLT_FN (BUILT_IN_COPYSIGN):
- CASE_FLT_FN_FLOATN_NX (BUILT_IN_COPYSIGN):
- target = expand_builtin_copysign (exp, target, subtarget);
- if (target)
- return target;
- break;
-
- /* Just do a normal library call if we were unable to fold
- the values. */
- CASE_FLT_FN (BUILT_IN_CABS):
- break;
-
- CASE_FLT_FN (BUILT_IN_FMA):
- CASE_FLT_FN_FLOATN_NX (BUILT_IN_FMA):
- target = expand_builtin_mathfn_ternary (exp, target, subtarget);
- if (target)
- return target;
- break;
-
- CASE_FLT_FN (BUILT_IN_ILOGB):
- if (! flag_unsafe_math_optimizations)
+ /* If this is turned into an external library call, the weak parameter
+ must be dropped to match the expected parameter list. */
+ nargs = call_expr_nargs (exp);
+ vec_alloc (vec, nargs - 1);
+ for (z = 0; z < 3; z++)
+ vec->quick_push (CALL_EXPR_ARG (exp, z));
+ /* Skip the boolean weak parameter. */
+ for (z = 4; z < 6; z++)
+ vec->quick_push (CALL_EXPR_ARG (exp, z));
+ exp = build_call_vec (TREE_TYPE (exp), CALL_EXPR_FN (exp), vec);
break;
- gcc_fallthrough ();
- CASE_FLT_FN (BUILT_IN_ISINF):
- CASE_FLT_FN (BUILT_IN_FINITE):
- case BUILT_IN_ISFINITE:
- case BUILT_IN_ISNORMAL:
- target = expand_builtin_interclass_mathfn (exp, target);
- if (target)
- return target;
- break;
-
- CASE_FLT_FN (BUILT_IN_ICEIL):
- CASE_FLT_FN (BUILT_IN_LCEIL):
- CASE_FLT_FN (BUILT_IN_LLCEIL):
- CASE_FLT_FN (BUILT_IN_LFLOOR):
- CASE_FLT_FN (BUILT_IN_IFLOOR):
- CASE_FLT_FN (BUILT_IN_LLFLOOR):
- target = expand_builtin_int_roundingfn (exp, target);
- if (target)
- return target;
- break;
-
- CASE_FLT_FN (BUILT_IN_IRINT):
- CASE_FLT_FN (BUILT_IN_LRINT):
- CASE_FLT_FN (BUILT_IN_LLRINT):
- CASE_FLT_FN (BUILT_IN_IROUND):
- CASE_FLT_FN (BUILT_IN_LROUND):
- CASE_FLT_FN (BUILT_IN_LLROUND):
- target = expand_builtin_int_roundingfn_2 (exp, target);
- if (target)
- return target;
- break;
+ }
- CASE_FLT_FN (BUILT_IN_POWI):
- target = expand_builtin_powi (exp, target);
+ case BUILT_IN_ATOMIC_LOAD_1:
+ case BUILT_IN_ATOMIC_LOAD_2:
+ case BUILT_IN_ATOMIC_LOAD_4:
+ case BUILT_IN_ATOMIC_LOAD_8:
+ case BUILT_IN_ATOMIC_LOAD_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_LOAD_1);
+ target = expand_builtin_atomic_load (mode, exp, target);
if (target)
return target;
break;
- CASE_FLT_FN (BUILT_IN_CEXPI):
- target = expand_builtin_cexpi (exp, target);
- gcc_assert (target);
- return target;
-
- CASE_FLT_FN (BUILT_IN_SIN):
- CASE_FLT_FN (BUILT_IN_COS):
- if (! flag_unsafe_math_optimizations)
- break;
- target = expand_builtin_mathfn_3 (exp, target, subtarget);
+ case BUILT_IN_ATOMIC_STORE_1:
+ case BUILT_IN_ATOMIC_STORE_2:
+ case BUILT_IN_ATOMIC_STORE_4:
+ case BUILT_IN_ATOMIC_STORE_8:
+ case BUILT_IN_ATOMIC_STORE_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_STORE_1);
+ target = expand_builtin_atomic_store (mode, exp);
if (target)
- return target;
+ return const0_rtx;
break;
- CASE_FLT_FN (BUILT_IN_SINCOS):
- if (! flag_unsafe_math_optimizations)
- break;
- target = expand_builtin_sincos (exp);
- if (target)
- return target;
- break;
-
- case BUILT_IN_APPLY_ARGS:
- return expand_builtin_apply_args ();
-
- /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
- FUNCTION with a copy of the parameters described by
- ARGUMENTS, and ARGSIZE. It returns a block of memory
- allocated on the stack into which is stored all the registers
- that might possibly be used for returning the result of a
- function. ARGUMENTS is the value returned by
- __builtin_apply_args. ARGSIZE is the number of bytes of
- arguments that must be copied. ??? How should this value be
- computed? We'll also need a safe worst case value for varargs
- functions. */
- case BUILT_IN_APPLY:
- if (!validate_arglist (exp, POINTER_TYPE,
- POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
- && !validate_arglist (exp, REFERENCE_TYPE,
- POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
- return const0_rtx;
- else
- {
- rtx ops[3];
-
- ops[0] = expand_normal (CALL_EXPR_ARG (exp, 0));
- ops[1] = expand_normal (CALL_EXPR_ARG (exp, 1));
- ops[2] = expand_normal (CALL_EXPR_ARG (exp, 2));
-
- return expand_builtin_apply (ops[0], ops[1], ops[2]);
- }
-
- /* __builtin_return (RESULT) causes the function to return the
- value described by RESULT. RESULT is address of the block of
- memory returned by __builtin_apply. */
- case BUILT_IN_RETURN:
- if (validate_arglist (exp, POINTER_TYPE, VOID_TYPE))
- expand_builtin_return (expand_normal (CALL_EXPR_ARG (exp, 0)));
- return const0_rtx;
-
- case BUILT_IN_SAVEREGS:
- return expand_builtin_saveregs ();
-
- case BUILT_IN_VA_ARG_PACK:
- /* All valid uses of __builtin_va_arg_pack () are removed during
- inlining. */
- error ("invalid use of %<__builtin_va_arg_pack ()%>");
- return const0_rtx;
-
- case BUILT_IN_VA_ARG_PACK_LEN:
- /* All valid uses of __builtin_va_arg_pack_len () are removed during
- inlining. */
- error ("invalid use of %<__builtin_va_arg_pack_len ()%>");
- return const0_rtx;
-
- /* Return the address of the first anonymous stack arg. */
- case BUILT_IN_NEXT_ARG:
- if (fold_builtin_next_arg (exp, false))
- return const0_rtx;
- return expand_builtin_next_arg ();
-
- case BUILT_IN_CLEAR_CACHE:
- expand_builtin___clear_cache (exp);
- return const0_rtx;
-
- case BUILT_IN_CLASSIFY_TYPE:
- return expand_builtin_classify_type (exp);
-
- case BUILT_IN_CONSTANT_P:
- return const0_rtx;
-
- case BUILT_IN_FRAME_ADDRESS:
- case BUILT_IN_RETURN_ADDRESS:
- return expand_builtin_frame_address (fndecl, exp);
-
- /* Returns the address of the area where the structure is returned.
- 0 otherwise. */
- case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
- if (call_expr_nargs (exp) != 0
- || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl)))
- || !MEM_P (DECL_RTL (DECL_RESULT (current_function_decl))))
- return const0_rtx;
- else
- return XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0);
-
- CASE_BUILT_IN_ALLOCA:
- target = expand_builtin_alloca (exp);
- if (target)
- return target;
- break;
-
- case BUILT_IN_ASAN_ALLOCAS_UNPOISON:
- return expand_asan_emit_allocas_unpoison (exp);
-
- case BUILT_IN_STACK_SAVE:
- return expand_stack_save ();
-
- case BUILT_IN_STACK_RESTORE:
- expand_stack_restore (CALL_EXPR_ARG (exp, 0));
- return const0_rtx;
-
- case BUILT_IN_BSWAP16:
- case BUILT_IN_BSWAP32:
- case BUILT_IN_BSWAP64:
- case BUILT_IN_BSWAP128:
- target = expand_builtin_bswap (target_mode, exp, target, subtarget);
- if (target)
- return target;
- break;
-
- CASE_INT_FN (BUILT_IN_FFS):
- target = expand_builtin_unop (target_mode, exp, target,
- subtarget, ffs_optab);
- if (target)
- return target;
- break;
-
- CASE_INT_FN (BUILT_IN_CLZ):
- target = expand_builtin_unop (target_mode, exp, target,
- subtarget, clz_optab);
- if (target)
- return target;
- break;
-
- CASE_INT_FN (BUILT_IN_CTZ):
- target = expand_builtin_unop (target_mode, exp, target,
- subtarget, ctz_optab);
- if (target)
- return target;
- break;
-
- CASE_INT_FN (BUILT_IN_CLRSB):
- target = expand_builtin_unop (target_mode, exp, target,
- subtarget, clrsb_optab);
- if (target)
- return target;
- break;
-
- CASE_INT_FN (BUILT_IN_POPCOUNT):
- target = expand_builtin_unop (target_mode, exp, target,
- subtarget, popcount_optab);
- if (target)
- return target;
- break;
-
- CASE_INT_FN (BUILT_IN_PARITY):
- target = expand_builtin_unop (target_mode, exp, target,
- subtarget, parity_optab);
- if (target)
- return target;
- break;
-
- case BUILT_IN_STRLEN:
- target = expand_builtin_strlen (exp, target, target_mode);
- if (target)
- return target;
- break;
-
- case BUILT_IN_STRNLEN:
- target = expand_builtin_strnlen (exp, target, target_mode);
- if (target)
- return target;
- break;
-
- case BUILT_IN_STRCAT:
- target = expand_builtin_strcat (exp);
- if (target)
- return target;
- break;
-
- case BUILT_IN_GETTEXT:
- case BUILT_IN_PUTS:
- case BUILT_IN_PUTS_UNLOCKED:
- case BUILT_IN_STRDUP:
- if (validate_arglist (exp, POINTER_TYPE, VOID_TYPE))
- check_read_access (exp, CALL_EXPR_ARG (exp, 0));
- break;
-
- case BUILT_IN_INDEX:
- case BUILT_IN_RINDEX:
- case BUILT_IN_STRCHR:
- case BUILT_IN_STRRCHR:
- if (validate_arglist (exp, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
- check_read_access (exp, CALL_EXPR_ARG (exp, 0));
- break;
-
- case BUILT_IN_FPUTS:
- case BUILT_IN_FPUTS_UNLOCKED:
- if (validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
- check_read_access (exp, CALL_EXPR_ARG (exp, 0));
- break;
-
- case BUILT_IN_STRNDUP:
- if (validate_arglist (exp, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
- check_read_access (exp, CALL_EXPR_ARG (exp, 0), CALL_EXPR_ARG (exp, 1));
- break;
-
- case BUILT_IN_STRCASECMP:
- case BUILT_IN_STRPBRK:
- case BUILT_IN_STRSPN:
- case BUILT_IN_STRCSPN:
- case BUILT_IN_STRSTR:
- if (validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
- {
- check_read_access (exp, CALL_EXPR_ARG (exp, 0));
- check_read_access (exp, CALL_EXPR_ARG (exp, 1));
- }
- break;
-
- case BUILT_IN_STRCPY:
- target = expand_builtin_strcpy (exp, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_STRNCAT:
- target = expand_builtin_strncat (exp, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_STRNCPY:
- target = expand_builtin_strncpy (exp, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_STPCPY:
- target = expand_builtin_stpcpy (exp, target, mode);
- if (target)
- return target;
- break;
-
- case BUILT_IN_STPNCPY:
- target = expand_builtin_stpncpy (exp, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_MEMCHR:
- target = expand_builtin_memchr (exp, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_MEMCPY:
- target = expand_builtin_memcpy (exp, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_MEMMOVE:
- target = expand_builtin_memmove (exp, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_MEMPCPY:
- target = expand_builtin_mempcpy (exp, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_MEMSET:
- target = expand_builtin_memset (exp, target, mode);
- if (target)
- return target;
- break;
-
- case BUILT_IN_BZERO:
- target = expand_builtin_bzero (exp);
- if (target)
- return target;
- break;
-
- /* Expand it as BUILT_IN_MEMCMP_EQ first. If not successful, change it
- back to a BUILT_IN_STRCMP. Remember to delete the 3rd parameter
- when changing it to a strcmp call. */
- case BUILT_IN_STRCMP_EQ:
- target = expand_builtin_memcmp (exp, target, true);
- if (target)
- return target;
-
- /* Change this call back to a BUILT_IN_STRCMP. */
- TREE_OPERAND (exp, 1)
- = build_fold_addr_expr (builtin_decl_explicit (BUILT_IN_STRCMP));
-
- /* Delete the last parameter. */
- unsigned int i;
- vec<tree, va_gc> *arg_vec;
- vec_alloc (arg_vec, 2);
- for (i = 0; i < 2; i++)
- arg_vec->quick_push (CALL_EXPR_ARG (exp, i));
- exp = build_call_vec (TREE_TYPE (exp), CALL_EXPR_FN (exp), arg_vec);
- /* FALLTHROUGH */
-
- case BUILT_IN_STRCMP:
- target = expand_builtin_strcmp (exp, target);
- if (target)
- return target;
- break;
-
- /* Expand it as BUILT_IN_MEMCMP_EQ first. If not successful, change it
- back to a BUILT_IN_STRNCMP. */
- case BUILT_IN_STRNCMP_EQ:
- target = expand_builtin_memcmp (exp, target, true);
- if (target)
- return target;
-
- /* Change it back to a BUILT_IN_STRNCMP. */
- TREE_OPERAND (exp, 1)
- = build_fold_addr_expr (builtin_decl_explicit (BUILT_IN_STRNCMP));
- /* FALLTHROUGH */
-
- case BUILT_IN_STRNCMP:
- target = expand_builtin_strncmp (exp, target, mode);
- if (target)
- return target;
- break;
-
- case BUILT_IN_BCMP:
- case BUILT_IN_MEMCMP:
- case BUILT_IN_MEMCMP_EQ:
- target = expand_builtin_memcmp (exp, target, fcode == BUILT_IN_MEMCMP_EQ);
- if (target)
- return target;
- if (fcode == BUILT_IN_MEMCMP_EQ)
- {
- tree newdecl = builtin_decl_explicit (BUILT_IN_MEMCMP);
- TREE_OPERAND (exp, 1) = build_fold_addr_expr (newdecl);
- }
- break;
-
- case BUILT_IN_SETJMP:
- /* This should have been lowered to the builtins below. */
- gcc_unreachable ();
-
- case BUILT_IN_SETJMP_SETUP:
- /* __builtin_setjmp_setup is passed a pointer to an array of five words
- and the receiver label. */
- if (validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
- {
- rtx buf_addr = expand_expr (CALL_EXPR_ARG (exp, 0), subtarget,
- VOIDmode, EXPAND_NORMAL);
- tree label = TREE_OPERAND (CALL_EXPR_ARG (exp, 1), 0);
- rtx_insn *label_r = label_rtx (label);
-
- /* This is copied from the handling of non-local gotos. */
- expand_builtin_setjmp_setup (buf_addr, label_r);
- nonlocal_goto_handler_labels
- = gen_rtx_INSN_LIST (VOIDmode, label_r,
- nonlocal_goto_handler_labels);
- /* ??? Do not let expand_label treat us as such since we would
- not want to be both on the list of non-local labels and on
- the list of forced labels. */
- FORCED_LABEL (label) = 0;
- return const0_rtx;
- }
- break;
-
- case BUILT_IN_SETJMP_RECEIVER:
- /* __builtin_setjmp_receiver is passed the receiver label. */
- if (validate_arglist (exp, POINTER_TYPE, VOID_TYPE))
- {
- tree label = TREE_OPERAND (CALL_EXPR_ARG (exp, 0), 0);
- rtx_insn *label_r = label_rtx (label);
-
- expand_builtin_setjmp_receiver (label_r);
- return const0_rtx;
- }
- break;
-
- /* __builtin_longjmp is passed a pointer to an array of five words.
- It's similar to the C library longjmp function but works with
- __builtin_setjmp above. */
- case BUILT_IN_LONGJMP:
- if (validate_arglist (exp, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
- {
- rtx buf_addr = expand_expr (CALL_EXPR_ARG (exp, 0), subtarget,
- VOIDmode, EXPAND_NORMAL);
- rtx value = expand_normal (CALL_EXPR_ARG (exp, 1));
-
- if (value != const1_rtx)
- {
- error ("%<__builtin_longjmp%> second argument must be 1");
- return const0_rtx;
- }
-
- expand_builtin_longjmp (buf_addr, value);
- return const0_rtx;
- }
- break;
-
- case BUILT_IN_NONLOCAL_GOTO:
- target = expand_builtin_nonlocal_goto (exp);
- if (target)
- return target;
- break;
-
- /* This updates the setjmp buffer that is its argument with the value
- of the current stack pointer. */
- case BUILT_IN_UPDATE_SETJMP_BUF:
- if (validate_arglist (exp, POINTER_TYPE, VOID_TYPE))
- {
- rtx buf_addr
- = expand_normal (CALL_EXPR_ARG (exp, 0));
-
- expand_builtin_update_setjmp_buf (buf_addr);
- return const0_rtx;
- }
- break;
-
- case BUILT_IN_TRAP:
- expand_builtin_trap ();
- return const0_rtx;
-
- case BUILT_IN_UNREACHABLE:
- expand_builtin_unreachable ();
- return const0_rtx;
-
- CASE_FLT_FN (BUILT_IN_SIGNBIT):
- case BUILT_IN_SIGNBITD32:
- case BUILT_IN_SIGNBITD64:
- case BUILT_IN_SIGNBITD128:
- target = expand_builtin_signbit (exp, target);
- if (target)
- return target;
- break;
-
- /* Various hooks for the DWARF 2 __throw routine. */
- case BUILT_IN_UNWIND_INIT:
- expand_builtin_unwind_init ();
- return const0_rtx;
- case BUILT_IN_DWARF_CFA:
- return virtual_cfa_rtx;
-#ifdef DWARF2_UNWIND_INFO
- case BUILT_IN_DWARF_SP_COLUMN:
- return expand_builtin_dwarf_sp_column ();
- case BUILT_IN_INIT_DWARF_REG_SIZES:
- expand_builtin_init_dwarf_reg_sizes (CALL_EXPR_ARG (exp, 0));
- return const0_rtx;
-#endif
- case BUILT_IN_FROB_RETURN_ADDR:
- return expand_builtin_frob_return_addr (CALL_EXPR_ARG (exp, 0));
- case BUILT_IN_EXTRACT_RETURN_ADDR:
- return expand_builtin_extract_return_addr (CALL_EXPR_ARG (exp, 0));
- case BUILT_IN_EH_RETURN:
- expand_builtin_eh_return (CALL_EXPR_ARG (exp, 0),
- CALL_EXPR_ARG (exp, 1));
- return const0_rtx;
- case BUILT_IN_EH_RETURN_DATA_REGNO:
- return expand_builtin_eh_return_data_regno (exp);
- case BUILT_IN_EXTEND_POINTER:
- return expand_builtin_extend_pointer (CALL_EXPR_ARG (exp, 0));
- case BUILT_IN_EH_POINTER:
- return expand_builtin_eh_pointer (exp);
- case BUILT_IN_EH_FILTER:
- return expand_builtin_eh_filter (exp);
- case BUILT_IN_EH_COPY_VALUES:
- return expand_builtin_eh_copy_values (exp);
-
- case BUILT_IN_VA_START:
- return expand_builtin_va_start (exp);
- case BUILT_IN_VA_END:
- return expand_builtin_va_end (exp);
- case BUILT_IN_VA_COPY:
- return expand_builtin_va_copy (exp);
- case BUILT_IN_EXPECT:
- return expand_builtin_expect (exp, target);
- case BUILT_IN_EXPECT_WITH_PROBABILITY:
- return expand_builtin_expect_with_probability (exp, target);
- case BUILT_IN_ASSUME_ALIGNED:
- return expand_builtin_assume_aligned (exp, target);
- case BUILT_IN_PREFETCH:
- expand_builtin_prefetch (exp);
- return const0_rtx;
-
- case BUILT_IN_INIT_TRAMPOLINE:
- return expand_builtin_init_trampoline (exp, true);
- case BUILT_IN_INIT_HEAP_TRAMPOLINE:
- return expand_builtin_init_trampoline (exp, false);
- case BUILT_IN_ADJUST_TRAMPOLINE:
- return expand_builtin_adjust_trampoline (exp);
-
- case BUILT_IN_INIT_DESCRIPTOR:
- return expand_builtin_init_descriptor (exp);
- case BUILT_IN_ADJUST_DESCRIPTOR:
- return expand_builtin_adjust_descriptor (exp);
-
- case BUILT_IN_FORK:
- case BUILT_IN_EXECL:
- case BUILT_IN_EXECV:
- case BUILT_IN_EXECLP:
- case BUILT_IN_EXECLE:
- case BUILT_IN_EXECVP:
- case BUILT_IN_EXECVE:
- target = expand_builtin_fork_or_exec (fndecl, exp, target, ignore);
- if (target)
- return target;
- break;
-
- case BUILT_IN_SYNC_FETCH_AND_ADD_1:
- case BUILT_IN_SYNC_FETCH_AND_ADD_2:
- case BUILT_IN_SYNC_FETCH_AND_ADD_4:
- case BUILT_IN_SYNC_FETCH_AND_ADD_8:
- case BUILT_IN_SYNC_FETCH_AND_ADD_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_FETCH_AND_ADD_1);
- target = expand_builtin_sync_operation (mode, exp, PLUS, false, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_SYNC_FETCH_AND_SUB_1:
- case BUILT_IN_SYNC_FETCH_AND_SUB_2:
- case BUILT_IN_SYNC_FETCH_AND_SUB_4:
- case BUILT_IN_SYNC_FETCH_AND_SUB_8:
- case BUILT_IN_SYNC_FETCH_AND_SUB_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_FETCH_AND_SUB_1);
- target = expand_builtin_sync_operation (mode, exp, MINUS, false, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_SYNC_FETCH_AND_OR_1:
- case BUILT_IN_SYNC_FETCH_AND_OR_2:
- case BUILT_IN_SYNC_FETCH_AND_OR_4:
- case BUILT_IN_SYNC_FETCH_AND_OR_8:
- case BUILT_IN_SYNC_FETCH_AND_OR_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_FETCH_AND_OR_1);
- target = expand_builtin_sync_operation (mode, exp, IOR, false, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_SYNC_FETCH_AND_AND_1:
- case BUILT_IN_SYNC_FETCH_AND_AND_2:
- case BUILT_IN_SYNC_FETCH_AND_AND_4:
- case BUILT_IN_SYNC_FETCH_AND_AND_8:
- case BUILT_IN_SYNC_FETCH_AND_AND_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_FETCH_AND_AND_1);
- target = expand_builtin_sync_operation (mode, exp, AND, false, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_SYNC_FETCH_AND_XOR_1:
- case BUILT_IN_SYNC_FETCH_AND_XOR_2:
- case BUILT_IN_SYNC_FETCH_AND_XOR_4:
- case BUILT_IN_SYNC_FETCH_AND_XOR_8:
- case BUILT_IN_SYNC_FETCH_AND_XOR_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_FETCH_AND_XOR_1);
- target = expand_builtin_sync_operation (mode, exp, XOR, false, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_SYNC_FETCH_AND_NAND_1:
- case BUILT_IN_SYNC_FETCH_AND_NAND_2:
- case BUILT_IN_SYNC_FETCH_AND_NAND_4:
- case BUILT_IN_SYNC_FETCH_AND_NAND_8:
- case BUILT_IN_SYNC_FETCH_AND_NAND_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_FETCH_AND_NAND_1);
- target = expand_builtin_sync_operation (mode, exp, NOT, false, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_SYNC_ADD_AND_FETCH_1:
- case BUILT_IN_SYNC_ADD_AND_FETCH_2:
- case BUILT_IN_SYNC_ADD_AND_FETCH_4:
- case BUILT_IN_SYNC_ADD_AND_FETCH_8:
- case BUILT_IN_SYNC_ADD_AND_FETCH_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_ADD_AND_FETCH_1);
- target = expand_builtin_sync_operation (mode, exp, PLUS, true, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_SYNC_SUB_AND_FETCH_1:
- case BUILT_IN_SYNC_SUB_AND_FETCH_2:
- case BUILT_IN_SYNC_SUB_AND_FETCH_4:
- case BUILT_IN_SYNC_SUB_AND_FETCH_8:
- case BUILT_IN_SYNC_SUB_AND_FETCH_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_SUB_AND_FETCH_1);
- target = expand_builtin_sync_operation (mode, exp, MINUS, true, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_SYNC_OR_AND_FETCH_1:
- case BUILT_IN_SYNC_OR_AND_FETCH_2:
- case BUILT_IN_SYNC_OR_AND_FETCH_4:
- case BUILT_IN_SYNC_OR_AND_FETCH_8:
- case BUILT_IN_SYNC_OR_AND_FETCH_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_OR_AND_FETCH_1);
- target = expand_builtin_sync_operation (mode, exp, IOR, true, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_SYNC_AND_AND_FETCH_1:
- case BUILT_IN_SYNC_AND_AND_FETCH_2:
- case BUILT_IN_SYNC_AND_AND_FETCH_4:
- case BUILT_IN_SYNC_AND_AND_FETCH_8:
- case BUILT_IN_SYNC_AND_AND_FETCH_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_AND_AND_FETCH_1);
- target = expand_builtin_sync_operation (mode, exp, AND, true, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_SYNC_XOR_AND_FETCH_1:
- case BUILT_IN_SYNC_XOR_AND_FETCH_2:
- case BUILT_IN_SYNC_XOR_AND_FETCH_4:
- case BUILT_IN_SYNC_XOR_AND_FETCH_8:
- case BUILT_IN_SYNC_XOR_AND_FETCH_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_XOR_AND_FETCH_1);
- target = expand_builtin_sync_operation (mode, exp, XOR, true, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_SYNC_NAND_AND_FETCH_1:
- case BUILT_IN_SYNC_NAND_AND_FETCH_2:
- case BUILT_IN_SYNC_NAND_AND_FETCH_4:
- case BUILT_IN_SYNC_NAND_AND_FETCH_8:
- case BUILT_IN_SYNC_NAND_AND_FETCH_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_NAND_AND_FETCH_1);
- target = expand_builtin_sync_operation (mode, exp, NOT, true, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_SYNC_BOOL_COMPARE_AND_SWAP_1:
- case BUILT_IN_SYNC_BOOL_COMPARE_AND_SWAP_2:
- case BUILT_IN_SYNC_BOOL_COMPARE_AND_SWAP_4:
- case BUILT_IN_SYNC_BOOL_COMPARE_AND_SWAP_8:
- case BUILT_IN_SYNC_BOOL_COMPARE_AND_SWAP_16:
- if (mode == VOIDmode)
- mode = TYPE_MODE (boolean_type_node);
- if (!target || !register_operand (target, mode))
- target = gen_reg_rtx (mode);
-
- mode = get_builtin_sync_mode
- (fcode - BUILT_IN_SYNC_BOOL_COMPARE_AND_SWAP_1);
- target = expand_builtin_compare_and_swap (mode, exp, true, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_SYNC_VAL_COMPARE_AND_SWAP_1:
- case BUILT_IN_SYNC_VAL_COMPARE_AND_SWAP_2:
- case BUILT_IN_SYNC_VAL_COMPARE_AND_SWAP_4:
- case BUILT_IN_SYNC_VAL_COMPARE_AND_SWAP_8:
- case BUILT_IN_SYNC_VAL_COMPARE_AND_SWAP_16:
- mode = get_builtin_sync_mode
- (fcode - BUILT_IN_SYNC_VAL_COMPARE_AND_SWAP_1);
- target = expand_builtin_compare_and_swap (mode, exp, false, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_SYNC_LOCK_TEST_AND_SET_1:
- case BUILT_IN_SYNC_LOCK_TEST_AND_SET_2:
- case BUILT_IN_SYNC_LOCK_TEST_AND_SET_4:
- case BUILT_IN_SYNC_LOCK_TEST_AND_SET_8:
- case BUILT_IN_SYNC_LOCK_TEST_AND_SET_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_LOCK_TEST_AND_SET_1);
- target = expand_builtin_sync_lock_test_and_set (mode, exp, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_SYNC_LOCK_RELEASE_1:
- case BUILT_IN_SYNC_LOCK_RELEASE_2:
- case BUILT_IN_SYNC_LOCK_RELEASE_4:
- case BUILT_IN_SYNC_LOCK_RELEASE_8:
- case BUILT_IN_SYNC_LOCK_RELEASE_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_SYNC_LOCK_RELEASE_1);
- expand_builtin_sync_lock_release (mode, exp);
- return const0_rtx;
-
- case BUILT_IN_SYNC_SYNCHRONIZE:
- expand_builtin_sync_synchronize ();
- return const0_rtx;
-
- case BUILT_IN_ATOMIC_EXCHANGE_1:
- case BUILT_IN_ATOMIC_EXCHANGE_2:
- case BUILT_IN_ATOMIC_EXCHANGE_4:
- case BUILT_IN_ATOMIC_EXCHANGE_8:
- case BUILT_IN_ATOMIC_EXCHANGE_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_EXCHANGE_1);
- target = expand_builtin_atomic_exchange (mode, exp, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_1:
- case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_2:
- case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_4:
- case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_8:
- case BUILT_IN_ATOMIC_COMPARE_EXCHANGE_16:
- {
- unsigned int nargs, z;
- vec<tree, va_gc> *vec;
-
- mode =
- get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_COMPARE_EXCHANGE_1);
- target = expand_builtin_atomic_compare_exchange (mode, exp, target);
- if (target)
- return target;
-
- /* If this is turned into an external library call, the weak parameter
- must be dropped to match the expected parameter list. */
- nargs = call_expr_nargs (exp);
- vec_alloc (vec, nargs - 1);
- for (z = 0; z < 3; z++)
- vec->quick_push (CALL_EXPR_ARG (exp, z));
- /* Skip the boolean weak parameter. */
- for (z = 4; z < 6; z++)
- vec->quick_push (CALL_EXPR_ARG (exp, z));
- exp = build_call_vec (TREE_TYPE (exp), CALL_EXPR_FN (exp), vec);
- break;
- }
-
- case BUILT_IN_ATOMIC_LOAD_1:
- case BUILT_IN_ATOMIC_LOAD_2:
- case BUILT_IN_ATOMIC_LOAD_4:
- case BUILT_IN_ATOMIC_LOAD_8:
- case BUILT_IN_ATOMIC_LOAD_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_LOAD_1);
- target = expand_builtin_atomic_load (mode, exp, target);
- if (target)
- return target;
- break;
-
- case BUILT_IN_ATOMIC_STORE_1:
- case BUILT_IN_ATOMIC_STORE_2:
- case BUILT_IN_ATOMIC_STORE_4:
- case BUILT_IN_ATOMIC_STORE_8:
- case BUILT_IN_ATOMIC_STORE_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_STORE_1);
- target = expand_builtin_atomic_store (mode, exp);
- if (target)
- return const0_rtx;
- break;
-
- case BUILT_IN_ATOMIC_ADD_FETCH_1:
- case BUILT_IN_ATOMIC_ADD_FETCH_2:
- case BUILT_IN_ATOMIC_ADD_FETCH_4:
- case BUILT_IN_ATOMIC_ADD_FETCH_8:
- case BUILT_IN_ATOMIC_ADD_FETCH_16:
- {
- enum built_in_function lib;
- mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_ADD_FETCH_1);
- lib = (enum built_in_function)((int)BUILT_IN_ATOMIC_FETCH_ADD_1 +
- (fcode - BUILT_IN_ATOMIC_ADD_FETCH_1));
- target = expand_builtin_atomic_fetch_op (mode, exp, target, PLUS, true,
- ignore, lib);
- if (target)
- return target;
- break;
- }
- case BUILT_IN_ATOMIC_SUB_FETCH_1:
- case BUILT_IN_ATOMIC_SUB_FETCH_2:
- case BUILT_IN_ATOMIC_SUB_FETCH_4:
- case BUILT_IN_ATOMIC_SUB_FETCH_8:
- case BUILT_IN_ATOMIC_SUB_FETCH_16:
- {
- enum built_in_function lib;
- mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_SUB_FETCH_1);
- lib = (enum built_in_function)((int)BUILT_IN_ATOMIC_FETCH_SUB_1 +
- (fcode - BUILT_IN_ATOMIC_SUB_FETCH_1));
- target = expand_builtin_atomic_fetch_op (mode, exp, target, MINUS, true,
- ignore, lib);
- if (target)
- return target;
- break;
- }
- case BUILT_IN_ATOMIC_AND_FETCH_1:
- case BUILT_IN_ATOMIC_AND_FETCH_2:
- case BUILT_IN_ATOMIC_AND_FETCH_4:
- case BUILT_IN_ATOMIC_AND_FETCH_8:
- case BUILT_IN_ATOMIC_AND_FETCH_16:
- {
- enum built_in_function lib;
- mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_AND_FETCH_1);
- lib = (enum built_in_function)((int)BUILT_IN_ATOMIC_FETCH_AND_1 +
- (fcode - BUILT_IN_ATOMIC_AND_FETCH_1));
- target = expand_builtin_atomic_fetch_op (mode, exp, target, AND, true,
- ignore, lib);
- if (target)
- return target;
- break;
- }
- case BUILT_IN_ATOMIC_NAND_FETCH_1:
- case BUILT_IN_ATOMIC_NAND_FETCH_2:
- case BUILT_IN_ATOMIC_NAND_FETCH_4:
- case BUILT_IN_ATOMIC_NAND_FETCH_8:
- case BUILT_IN_ATOMIC_NAND_FETCH_16:
- {
- enum built_in_function lib;
- mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_NAND_FETCH_1);
- lib = (enum built_in_function)((int)BUILT_IN_ATOMIC_FETCH_NAND_1 +
- (fcode - BUILT_IN_ATOMIC_NAND_FETCH_1));
- target = expand_builtin_atomic_fetch_op (mode, exp, target, NOT, true,
- ignore, lib);
- if (target)
- return target;
- break;
- }
- case BUILT_IN_ATOMIC_XOR_FETCH_1:
- case BUILT_IN_ATOMIC_XOR_FETCH_2:
- case BUILT_IN_ATOMIC_XOR_FETCH_4:
- case BUILT_IN_ATOMIC_XOR_FETCH_8:
- case BUILT_IN_ATOMIC_XOR_FETCH_16:
- {
- enum built_in_function lib;
- mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_XOR_FETCH_1);
- lib = (enum built_in_function)((int)BUILT_IN_ATOMIC_FETCH_XOR_1 +
- (fcode - BUILT_IN_ATOMIC_XOR_FETCH_1));
- target = expand_builtin_atomic_fetch_op (mode, exp, target, XOR, true,
- ignore, lib);
- if (target)
- return target;
- break;
- }
- case BUILT_IN_ATOMIC_OR_FETCH_1:
- case BUILT_IN_ATOMIC_OR_FETCH_2:
- case BUILT_IN_ATOMIC_OR_FETCH_4:
- case BUILT_IN_ATOMIC_OR_FETCH_8:
- case BUILT_IN_ATOMIC_OR_FETCH_16:
- {
- enum built_in_function lib;
- mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_OR_FETCH_1);
- lib = (enum built_in_function)((int)BUILT_IN_ATOMIC_FETCH_OR_1 +
- (fcode - BUILT_IN_ATOMIC_OR_FETCH_1));
- target = expand_builtin_atomic_fetch_op (mode, exp, target, IOR, true,
- ignore, lib);
- if (target)
- return target;
- break;
- }
- case BUILT_IN_ATOMIC_FETCH_ADD_1:
- case BUILT_IN_ATOMIC_FETCH_ADD_2:
- case BUILT_IN_ATOMIC_FETCH_ADD_4:
- case BUILT_IN_ATOMIC_FETCH_ADD_8:
- case BUILT_IN_ATOMIC_FETCH_ADD_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_FETCH_ADD_1);
- target = expand_builtin_atomic_fetch_op (mode, exp, target, PLUS, false,
- ignore, BUILT_IN_NONE);
- if (target)
- return target;
- break;
-
- case BUILT_IN_ATOMIC_FETCH_SUB_1:
- case BUILT_IN_ATOMIC_FETCH_SUB_2:
- case BUILT_IN_ATOMIC_FETCH_SUB_4:
- case BUILT_IN_ATOMIC_FETCH_SUB_8:
- case BUILT_IN_ATOMIC_FETCH_SUB_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_FETCH_SUB_1);
- target = expand_builtin_atomic_fetch_op (mode, exp, target, MINUS, false,
- ignore, BUILT_IN_NONE);
- if (target)
- return target;
- break;
-
- case BUILT_IN_ATOMIC_FETCH_AND_1:
- case BUILT_IN_ATOMIC_FETCH_AND_2:
- case BUILT_IN_ATOMIC_FETCH_AND_4:
- case BUILT_IN_ATOMIC_FETCH_AND_8:
- case BUILT_IN_ATOMIC_FETCH_AND_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_FETCH_AND_1);
- target = expand_builtin_atomic_fetch_op (mode, exp, target, AND, false,
- ignore, BUILT_IN_NONE);
- if (target)
- return target;
- break;
-
- case BUILT_IN_ATOMIC_FETCH_NAND_1:
- case BUILT_IN_ATOMIC_FETCH_NAND_2:
- case BUILT_IN_ATOMIC_FETCH_NAND_4:
- case BUILT_IN_ATOMIC_FETCH_NAND_8:
- case BUILT_IN_ATOMIC_FETCH_NAND_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_FETCH_NAND_1);
- target = expand_builtin_atomic_fetch_op (mode, exp, target, NOT, false,
- ignore, BUILT_IN_NONE);
- if (target)
- return target;
- break;
-
- case BUILT_IN_ATOMIC_FETCH_XOR_1:
- case BUILT_IN_ATOMIC_FETCH_XOR_2:
- case BUILT_IN_ATOMIC_FETCH_XOR_4:
- case BUILT_IN_ATOMIC_FETCH_XOR_8:
- case BUILT_IN_ATOMIC_FETCH_XOR_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_FETCH_XOR_1);
- target = expand_builtin_atomic_fetch_op (mode, exp, target, XOR, false,
- ignore, BUILT_IN_NONE);
- if (target)
- return target;
- break;
-
- case BUILT_IN_ATOMIC_FETCH_OR_1:
- case BUILT_IN_ATOMIC_FETCH_OR_2:
- case BUILT_IN_ATOMIC_FETCH_OR_4:
- case BUILT_IN_ATOMIC_FETCH_OR_8:
- case BUILT_IN_ATOMIC_FETCH_OR_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_FETCH_OR_1);
- target = expand_builtin_atomic_fetch_op (mode, exp, target, IOR, false,
- ignore, BUILT_IN_NONE);
- if (target)
- return target;
- break;
-
- case BUILT_IN_ATOMIC_TEST_AND_SET:
- return expand_builtin_atomic_test_and_set (exp, target);
-
- case BUILT_IN_ATOMIC_CLEAR:
- return expand_builtin_atomic_clear (exp);
-
- case BUILT_IN_ATOMIC_ALWAYS_LOCK_FREE:
- return expand_builtin_atomic_always_lock_free (exp);
-
- case BUILT_IN_ATOMIC_IS_LOCK_FREE:
- target = expand_builtin_atomic_is_lock_free (exp);
- if (target)
- return target;
- break;
-
- case BUILT_IN_ATOMIC_THREAD_FENCE:
- expand_builtin_atomic_thread_fence (exp);
- return const0_rtx;
-
- case BUILT_IN_ATOMIC_SIGNAL_FENCE:
- expand_builtin_atomic_signal_fence (exp);
- return const0_rtx;
-
- case BUILT_IN_OBJECT_SIZE:
- return expand_builtin_object_size (exp);
-
- case BUILT_IN_MEMCPY_CHK:
- case BUILT_IN_MEMPCPY_CHK:
- case BUILT_IN_MEMMOVE_CHK:
- case BUILT_IN_MEMSET_CHK:
- target = expand_builtin_memory_chk (exp, target, mode, fcode);
- if (target)
- return target;
- break;
-
- case BUILT_IN_STRCPY_CHK:
- case BUILT_IN_STPCPY_CHK:
- case BUILT_IN_STRNCPY_CHK:
- case BUILT_IN_STPNCPY_CHK:
- case BUILT_IN_STRCAT_CHK:
- case BUILT_IN_STRNCAT_CHK:
- case BUILT_IN_SNPRINTF_CHK:
- case BUILT_IN_VSNPRINTF_CHK:
- maybe_emit_chk_warning (exp, fcode);
- break;
-
- case BUILT_IN_SPRINTF_CHK:
- case BUILT_IN_VSPRINTF_CHK:
- maybe_emit_sprintf_chk_warning (exp, fcode);
- break;
-
- case BUILT_IN_THREAD_POINTER:
- return expand_builtin_thread_pointer (exp, target);
-
- case BUILT_IN_SET_THREAD_POINTER:
- expand_builtin_set_thread_pointer (exp);
- return const0_rtx;
-
- case BUILT_IN_ACC_ON_DEVICE:
- /* Do library call, if we failed to expand the builtin when
- folding. */
- break;
-
- case BUILT_IN_GOACC_PARLEVEL_ID:
- case BUILT_IN_GOACC_PARLEVEL_SIZE:
- return expand_builtin_goacc_parlevel_id_size (exp, target, ignore);
-
- case BUILT_IN_SPECULATION_SAFE_VALUE_PTR:
- return expand_speculation_safe_value (VOIDmode, exp, target, ignore);
-
- case BUILT_IN_SPECULATION_SAFE_VALUE_1:
- case BUILT_IN_SPECULATION_SAFE_VALUE_2:
- case BUILT_IN_SPECULATION_SAFE_VALUE_4:
- case BUILT_IN_SPECULATION_SAFE_VALUE_8:
- case BUILT_IN_SPECULATION_SAFE_VALUE_16:
- mode = get_builtin_sync_mode (fcode - BUILT_IN_SPECULATION_SAFE_VALUE_1);
- return expand_speculation_safe_value (mode, exp, target, ignore);
-
- default: /* just do library call, if unknown builtin */
- break;
- }
-
- /* The switch statement above can drop through to cause the function
- to be called normally. */
- return expand_call (exp, target, ignore);
-}
-
-/* Determine whether a tree node represents a call to a built-in
- function. If the tree T is a call to a built-in function with
- the right number of arguments of the appropriate types, return
- the DECL_FUNCTION_CODE of the call, e.g. BUILT_IN_SQRT.
- Otherwise the return value is END_BUILTINS. */
-
-enum built_in_function
-builtin_mathfn_code (const_tree t)
-{
- const_tree fndecl, arg, parmlist;
- const_tree argtype, parmtype;
- const_call_expr_arg_iterator iter;
-
- if (TREE_CODE (t) != CALL_EXPR)
- return END_BUILTINS;
-
- fndecl = get_callee_fndecl (t);
- if (fndecl == NULL_TREE || !fndecl_built_in_p (fndecl, BUILT_IN_NORMAL))
- return END_BUILTINS;
-
- parmlist = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
- init_const_call_expr_arg_iterator (t, &iter);
- for (; parmlist; parmlist = TREE_CHAIN (parmlist))
- {
- /* If a function doesn't take a variable number of arguments,
- the last element in the list will have type `void'. */
- parmtype = TREE_VALUE (parmlist);
- if (VOID_TYPE_P (parmtype))
- {
- if (more_const_call_expr_args_p (&iter))
- return END_BUILTINS;
- return DECL_FUNCTION_CODE (fndecl);
- }
-
- if (! more_const_call_expr_args_p (&iter))
- return END_BUILTINS;
-
- arg = next_const_call_expr_arg (&iter);
- argtype = TREE_TYPE (arg);
-
- if (SCALAR_FLOAT_TYPE_P (parmtype))
- {
- if (! SCALAR_FLOAT_TYPE_P (argtype))
- return END_BUILTINS;
- }
- else if (COMPLEX_FLOAT_TYPE_P (parmtype))
- {
- if (! COMPLEX_FLOAT_TYPE_P (argtype))
- return END_BUILTINS;
- }
- else if (POINTER_TYPE_P (parmtype))
- {
- if (! POINTER_TYPE_P (argtype))
- return END_BUILTINS;
- }
- else if (INTEGRAL_TYPE_P (parmtype))
- {
- if (! INTEGRAL_TYPE_P (argtype))
- return END_BUILTINS;
- }
- else
- return END_BUILTINS;
- }
-
- /* Variable-length argument list. */
- return DECL_FUNCTION_CODE (fndecl);
-}
-
-/* Fold a call to __builtin_constant_p, if we know its argument ARG will
- evaluate to a constant. */
-
-static tree
-fold_builtin_constant_p (tree arg)
-{
- /* We return 1 for a numeric type that's known to be a constant
- value at compile-time or for an aggregate type that's a
- literal constant. */
- STRIP_NOPS (arg);
-
- /* If we know this is a constant, emit the constant of one. */
- if (CONSTANT_CLASS_P (arg)
- || (TREE_CODE (arg) == CONSTRUCTOR
- && TREE_CONSTANT (arg)))
- return integer_one_node;
- if (TREE_CODE (arg) == ADDR_EXPR)
- {
- tree op = TREE_OPERAND (arg, 0);
- if (TREE_CODE (op) == STRING_CST
- || (TREE_CODE (op) == ARRAY_REF
- && integer_zerop (TREE_OPERAND (op, 1))
- && TREE_CODE (TREE_OPERAND (op, 0)) == STRING_CST))
- return integer_one_node;
- }
-
- /* If this expression has side effects, show we don't know it to be a
- constant. Likewise if it's a pointer or aggregate type since in
- those case we only want literals, since those are only optimized
- when generating RTL, not later.
- And finally, if we are compiling an initializer, not code, we
- need to return a definite result now; there's not going to be any
- more optimization done. */
- if (TREE_SIDE_EFFECTS (arg)
- || AGGREGATE_TYPE_P (TREE_TYPE (arg))
- || POINTER_TYPE_P (TREE_TYPE (arg))
- || cfun == 0
- || folding_initializer
- || force_folding_builtin_constant_p)
- return integer_zero_node;
-
- return NULL_TREE;
-}
-
-/* Create builtin_expect or builtin_expect_with_probability
- with PRED and EXPECTED as its arguments and return it as a truthvalue.
- Fortran FE can also produce builtin_expect with PREDICTOR as third argument.
- builtin_expect_with_probability instead uses third argument as PROBABILITY
- value. */
-
-static tree
-build_builtin_expect_predicate (location_t loc, tree pred, tree expected,
- tree predictor, tree probability)
-{
- tree fn, arg_types, pred_type, expected_type, call_expr, ret_type;
-
- fn = builtin_decl_explicit (probability == NULL_TREE ? BUILT_IN_EXPECT
- : BUILT_IN_EXPECT_WITH_PROBABILITY);
- arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
- ret_type = TREE_TYPE (TREE_TYPE (fn));
- pred_type = TREE_VALUE (arg_types);
- expected_type = TREE_VALUE (TREE_CHAIN (arg_types));
-
- pred = fold_convert_loc (loc, pred_type, pred);
- expected = fold_convert_loc (loc, expected_type, expected);
-
- if (probability)
- call_expr = build_call_expr_loc (loc, fn, 3, pred, expected, probability);
- else
- call_expr = build_call_expr_loc (loc, fn, predictor ? 3 : 2, pred, expected,
- predictor);
-
- return build2 (NE_EXPR, TREE_TYPE (pred), call_expr,
- build_int_cst (ret_type, 0));
-}
-
-/* Fold a call to builtin_expect with arguments ARG0, ARG1, ARG2, ARG3. Return
- NULL_TREE if no simplification is possible. */
-
-tree
-fold_builtin_expect (location_t loc, tree arg0, tree arg1, tree arg2,
- tree arg3)
-{
- tree inner, fndecl, inner_arg0;
- enum tree_code code;
-
- /* Distribute the expected value over short-circuiting operators.
- See through the cast from truthvalue_type_node to long. */
- inner_arg0 = arg0;
- while (CONVERT_EXPR_P (inner_arg0)
- && INTEGRAL_TYPE_P (TREE_TYPE (inner_arg0))
- && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (inner_arg0, 0))))
- inner_arg0 = TREE_OPERAND (inner_arg0, 0);
-
- /* If this is a builtin_expect within a builtin_expect keep the
- inner one. See through a comparison against a constant. It
- might have been added to create a thruthvalue. */
- inner = inner_arg0;
-
- if (COMPARISON_CLASS_P (inner)
- && TREE_CODE (TREE_OPERAND (inner, 1)) == INTEGER_CST)
- inner = TREE_OPERAND (inner, 0);
-
- if (TREE_CODE (inner) == CALL_EXPR
- && (fndecl = get_callee_fndecl (inner))
- && (fndecl_built_in_p (fndecl, BUILT_IN_EXPECT)
- || fndecl_built_in_p (fndecl, BUILT_IN_EXPECT_WITH_PROBABILITY)))
- return arg0;
-
- inner = inner_arg0;
- code = TREE_CODE (inner);
- if (code == TRUTH_ANDIF_EXPR || code == TRUTH_ORIF_EXPR)
- {
- tree op0 = TREE_OPERAND (inner, 0);
- tree op1 = TREE_OPERAND (inner, 1);
- arg1 = save_expr (arg1);
-
- op0 = build_builtin_expect_predicate (loc, op0, arg1, arg2, arg3);
- op1 = build_builtin_expect_predicate (loc, op1, arg1, arg2, arg3);
- inner = build2 (code, TREE_TYPE (inner), op0, op1);
-
- return fold_convert_loc (loc, TREE_TYPE (arg0), inner);
- }
-
- /* If the argument isn't invariant then there's nothing else we can do. */
- if (!TREE_CONSTANT (inner_arg0))
- return NULL_TREE;
-
- /* If we expect that a comparison against the argument will fold to
- a constant return the constant. In practice, this means a true
- constant or the address of a non-weak symbol. */
- inner = inner_arg0;
- STRIP_NOPS (inner);
- if (TREE_CODE (inner) == ADDR_EXPR)
- {
- do
- {
- inner = TREE_OPERAND (inner, 0);
- }
- while (TREE_CODE (inner) == COMPONENT_REF
- || TREE_CODE (inner) == ARRAY_REF);
- if (VAR_OR_FUNCTION_DECL_P (inner) && DECL_WEAK (inner))
- return NULL_TREE;
- }
-
- /* Otherwise, ARG0 already has the proper type for the return value. */
- return arg0;
-}
-
-/* Fold a call to __builtin_classify_type with argument ARG. */
-
-static tree
-fold_builtin_classify_type (tree arg)
-{
- if (arg == 0)
- return build_int_cst (integer_type_node, no_type_class);
-
- return build_int_cst (integer_type_node, type_to_class (TREE_TYPE (arg)));
-}
-
-/* Fold a call EXPR (which may be null) to __builtin_strlen with argument
- ARG. */
-
-static tree
-fold_builtin_strlen (location_t loc, tree expr, tree type, tree arg)
-{
- if (!validate_arg (arg, POINTER_TYPE))
- return NULL_TREE;
- else
- {
- c_strlen_data lendata = { };
- tree len = c_strlen (arg, 0, &lendata);
-
- if (len)
- return fold_convert_loc (loc, type, len);
-
- if (!lendata.decl)
- c_strlen (arg, 1, &lendata);
-
- if (lendata.decl)
- {
- if (EXPR_HAS_LOCATION (arg))
- loc = EXPR_LOCATION (arg);
- else if (loc == UNKNOWN_LOCATION)
- loc = input_location;
- warn_string_no_nul (loc, expr, "strlen", arg, lendata.decl);
- }
-
- return NULL_TREE;
- }
-}
-
-/* Fold a call to __builtin_inf or __builtin_huge_val. */
-
-static tree
-fold_builtin_inf (location_t loc, tree type, int warn)
-{
- REAL_VALUE_TYPE real;
-
- /* __builtin_inff is intended to be usable to define INFINITY on all
- targets. If an infinity is not available, INFINITY expands "to a
- positive constant of type float that overflows at translation
- time", footnote "In this case, using INFINITY will violate the
- constraint in 6.4.4 and thus require a diagnostic." (C99 7.12#4).
- Thus we pedwarn to ensure this constraint violation is
- diagnosed. */
- if (!MODE_HAS_INFINITIES (TYPE_MODE (type)) && warn)
- pedwarn (loc, 0, "target format does not support infinity");
-
- real_inf (&real);
- return build_real (type, real);
-}
-
-/* Fold function call to builtin sincos, sincosf, or sincosl. Return
- NULL_TREE if no simplification can be made. */
-
-static tree
-fold_builtin_sincos (location_t loc,
- tree arg0, tree arg1, tree arg2)
-{
- tree type;
- tree fndecl, call = NULL_TREE;
-
- if (!validate_arg (arg0, REAL_TYPE)
- || !validate_arg (arg1, POINTER_TYPE)
- || !validate_arg (arg2, POINTER_TYPE))
- return NULL_TREE;
-
- type = TREE_TYPE (arg0);
-
- /* Calculate the result when the argument is a constant. */
- built_in_function fn = mathfn_built_in_2 (type, CFN_BUILT_IN_CEXPI);
- if (fn == END_BUILTINS)
- return NULL_TREE;
-
- /* Canonicalize sincos to cexpi. */
- if (TREE_CODE (arg0) == REAL_CST)
- {
- tree complex_type = build_complex_type (type);
- call = fold_const_call (as_combined_fn (fn), complex_type, arg0);
- }
- if (!call)
- {
- if (!targetm.libc_has_function (function_c99_math_complex, type)
- || !builtin_decl_implicit_p (fn))
- return NULL_TREE;
- fndecl = builtin_decl_explicit (fn);
- call = build_call_expr_loc (loc, fndecl, 1, arg0);
- call = builtin_save_expr (call);
- }
-
- tree ptype = build_pointer_type (type);
- arg1 = fold_convert (ptype, arg1);
- arg2 = fold_convert (ptype, arg2);
- return build2 (COMPOUND_EXPR, void_type_node,
- build2 (MODIFY_EXPR, void_type_node,
- build_fold_indirect_ref_loc (loc, arg1),
- fold_build1_loc (loc, IMAGPART_EXPR, type, call)),
- build2 (MODIFY_EXPR, void_type_node,
- build_fold_indirect_ref_loc (loc, arg2),
- fold_build1_loc (loc, REALPART_EXPR, type, call)));
-}
-
-/* Fold function call to builtin memcmp with arguments ARG1 and ARG2.
- Return NULL_TREE if no simplification can be made. */
-
-static tree
-fold_builtin_memcmp (location_t loc, tree arg1, tree arg2, tree len)
-{
- if (!validate_arg (arg1, POINTER_TYPE)
- || !validate_arg (arg2, POINTER_TYPE)
- || !validate_arg (len, INTEGER_TYPE))
- return NULL_TREE;
-
- /* If the LEN parameter is zero, return zero. */
- if (integer_zerop (len))
- return omit_two_operands_loc (loc, integer_type_node, integer_zero_node,
- arg1, arg2);
-
- /* If ARG1 and ARG2 are the same (and not volatile), return zero. */
- if (operand_equal_p (arg1, arg2, 0))
- return omit_one_operand_loc (loc, integer_type_node, integer_zero_node, len);
-
- /* If len parameter is one, return an expression corresponding to
- (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
- if (tree_fits_uhwi_p (len) && tree_to_uhwi (len) == 1)
- {
- tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
- tree cst_uchar_ptr_node
- = build_pointer_type_for_mode (cst_uchar_node, ptr_mode, true);
-
- tree ind1
- = fold_convert_loc (loc, integer_type_node,
- build1 (INDIRECT_REF, cst_uchar_node,
- fold_convert_loc (loc,
- cst_uchar_ptr_node,
- arg1)));
- tree ind2
- = fold_convert_loc (loc, integer_type_node,
- build1 (INDIRECT_REF, cst_uchar_node,
- fold_convert_loc (loc,
- cst_uchar_ptr_node,
- arg2)));
- return fold_build2_loc (loc, MINUS_EXPR, integer_type_node, ind1, ind2);
- }
-
- return NULL_TREE;
-}
-
-/* Fold a call to builtin isascii with argument ARG. */
-
-static tree
-fold_builtin_isascii (location_t loc, tree arg)
-{
- if (!validate_arg (arg, INTEGER_TYPE))
- return NULL_TREE;
- else
- {
- /* Transform isascii(c) -> ((c & ~0x7f) == 0). */
- arg = fold_build2 (BIT_AND_EXPR, integer_type_node, arg,
- build_int_cst (integer_type_node,
- ~ (unsigned HOST_WIDE_INT) 0x7f));
- return fold_build2_loc (loc, EQ_EXPR, integer_type_node,
- arg, integer_zero_node);
- }
-}
-
-/* Fold a call to builtin toascii with argument ARG. */
-
-static tree
-fold_builtin_toascii (location_t loc, tree arg)
-{
- if (!validate_arg (arg, INTEGER_TYPE))
- return NULL_TREE;
-
- /* Transform toascii(c) -> (c & 0x7f). */
- return fold_build2_loc (loc, BIT_AND_EXPR, integer_type_node, arg,
- build_int_cst (integer_type_node, 0x7f));
-}
-
-/* Fold a call to builtin isdigit with argument ARG. */
-
-static tree
-fold_builtin_isdigit (location_t loc, tree arg)
-{
- if (!validate_arg (arg, INTEGER_TYPE))
- return NULL_TREE;
- else
- {
- /* Transform isdigit(c) -> (unsigned)(c) - '0' <= 9. */
- /* According to the C standard, isdigit is unaffected by locale.
- However, it definitely is affected by the target character set. */
- unsigned HOST_WIDE_INT target_digit0
- = lang_hooks.to_target_charset ('0');
-
- if (target_digit0 == 0)
- return NULL_TREE;
-
- arg = fold_convert_loc (loc, unsigned_type_node, arg);
- arg = fold_build2 (MINUS_EXPR, unsigned_type_node, arg,
- build_int_cst (unsigned_type_node, target_digit0));
- return fold_build2_loc (loc, LE_EXPR, integer_type_node, arg,
- build_int_cst (unsigned_type_node, 9));
- }
-}
-
-/* Fold a call to fabs, fabsf or fabsl with argument ARG. */
-
-static tree
-fold_builtin_fabs (location_t loc, tree arg, tree type)
-{
- if (!validate_arg (arg, REAL_TYPE))
- return NULL_TREE;
-
- arg = fold_convert_loc (loc, type, arg);
- return fold_build1_loc (loc, ABS_EXPR, type, arg);
-}
-
-/* Fold a call to abs, labs, llabs or imaxabs with argument ARG. */
-
-static tree
-fold_builtin_abs (location_t loc, tree arg, tree type)
-{
- if (!validate_arg (arg, INTEGER_TYPE))
- return NULL_TREE;
-
- arg = fold_convert_loc (loc, type, arg);
- return fold_build1_loc (loc, ABS_EXPR, type, arg);
-}
-
-/* Fold a call to builtin carg(a+bi) -> atan2(b,a). */
-
-static tree
-fold_builtin_carg (location_t loc, tree arg, tree type)
-{
- if (validate_arg (arg, COMPLEX_TYPE)
- && TREE_CODE (TREE_TYPE (TREE_TYPE (arg))) == REAL_TYPE)
- {
- tree atan2_fn = mathfn_built_in (type, BUILT_IN_ATAN2);
-
- if (atan2_fn)
- {
- tree new_arg = builtin_save_expr (arg);
- tree r_arg = fold_build1_loc (loc, REALPART_EXPR, type, new_arg);
- tree i_arg = fold_build1_loc (loc, IMAGPART_EXPR, type, new_arg);
- return build_call_expr_loc (loc, atan2_fn, 2, i_arg, r_arg);
- }
- }
-
- return NULL_TREE;
-}
-
-/* Fold a call to builtin frexp, we can assume the base is 2. */
-
-static tree
-fold_builtin_frexp (location_t loc, tree arg0, tree arg1, tree rettype)
-{
- if (! validate_arg (arg0, REAL_TYPE) || ! validate_arg (arg1, POINTER_TYPE))
- return NULL_TREE;
-
- STRIP_NOPS (arg0);
-
- if (!(TREE_CODE (arg0) == REAL_CST && ! TREE_OVERFLOW (arg0)))
- return NULL_TREE;
-
- arg1 = build_fold_indirect_ref_loc (loc, arg1);
-
- /* Proceed if a valid pointer type was passed in. */
- if (TYPE_MAIN_VARIANT (TREE_TYPE (arg1)) == integer_type_node)
- {
- const REAL_VALUE_TYPE *const value = TREE_REAL_CST_PTR (arg0);
- tree frac, exp;
-
- switch (value->cl)
+ case BUILT_IN_ATOMIC_ADD_FETCH_1:
+ case BUILT_IN_ATOMIC_ADD_FETCH_2:
+ case BUILT_IN_ATOMIC_ADD_FETCH_4:
+ case BUILT_IN_ATOMIC_ADD_FETCH_8:
+ case BUILT_IN_ATOMIC_ADD_FETCH_16:
+ {
+ enum built_in_function lib;
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_ADD_FETCH_1);
+ lib = (enum built_in_function)((int)BUILT_IN_ATOMIC_FETCH_ADD_1 +
+ (fcode - BUILT_IN_ATOMIC_ADD_FETCH_1));
+ target = expand_builtin_atomic_fetch_op (mode, exp, target, PLUS, true,
+ ignore, lib);
+ if (target)
+ return target;
+ break;
+ }
+ case BUILT_IN_ATOMIC_SUB_FETCH_1:
+ case BUILT_IN_ATOMIC_SUB_FETCH_2:
+ case BUILT_IN_ATOMIC_SUB_FETCH_4:
+ case BUILT_IN_ATOMIC_SUB_FETCH_8:
+ case BUILT_IN_ATOMIC_SUB_FETCH_16:
{
- case rvc_zero:
- /* For +-0, return (*exp = 0, +-0). */
- exp = integer_zero_node;
- frac = arg0;
+ enum built_in_function lib;
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_SUB_FETCH_1);
+ lib = (enum built_in_function)((int)BUILT_IN_ATOMIC_FETCH_SUB_1 +
+ (fcode - BUILT_IN_ATOMIC_SUB_FETCH_1));
+ target = expand_builtin_atomic_fetch_op (mode, exp, target, MINUS, true,
+ ignore, lib);
+ if (target)
+ return target;
break;
- case rvc_nan:
- case rvc_inf:
- /* For +-NaN or +-Inf, *exp is unspecified, return arg0. */
- return omit_one_operand_loc (loc, rettype, arg0, arg1);
- case rvc_normal:
- {
- /* Since the frexp function always expects base 2, and in
- GCC normalized significands are already in the range
- [0.5, 1.0), we have exactly what frexp wants. */
- REAL_VALUE_TYPE frac_rvt = *value;
- SET_REAL_EXP (&frac_rvt, 0);
- frac = build_real (rettype, frac_rvt);
- exp = build_int_cst (integer_type_node, REAL_EXP (value));
- }
+ }
+ case BUILT_IN_ATOMIC_AND_FETCH_1:
+ case BUILT_IN_ATOMIC_AND_FETCH_2:
+ case BUILT_IN_ATOMIC_AND_FETCH_4:
+ case BUILT_IN_ATOMIC_AND_FETCH_8:
+ case BUILT_IN_ATOMIC_AND_FETCH_16:
+ {
+ enum built_in_function lib;
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_AND_FETCH_1);
+ lib = (enum built_in_function)((int)BUILT_IN_ATOMIC_FETCH_AND_1 +
+ (fcode - BUILT_IN_ATOMIC_AND_FETCH_1));
+ target = expand_builtin_atomic_fetch_op (mode, exp, target, AND, true,
+ ignore, lib);
+ if (target)
+ return target;
+ break;
+ }
+ case BUILT_IN_ATOMIC_NAND_FETCH_1:
+ case BUILT_IN_ATOMIC_NAND_FETCH_2:
+ case BUILT_IN_ATOMIC_NAND_FETCH_4:
+ case BUILT_IN_ATOMIC_NAND_FETCH_8:
+ case BUILT_IN_ATOMIC_NAND_FETCH_16:
+ {
+ enum built_in_function lib;
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_NAND_FETCH_1);
+ lib = (enum built_in_function)((int)BUILT_IN_ATOMIC_FETCH_NAND_1 +
+ (fcode - BUILT_IN_ATOMIC_NAND_FETCH_1));
+ target = expand_builtin_atomic_fetch_op (mode, exp, target, NOT, true,
+ ignore, lib);
+ if (target)
+ return target;
+ break;
+ }
+ case BUILT_IN_ATOMIC_XOR_FETCH_1:
+ case BUILT_IN_ATOMIC_XOR_FETCH_2:
+ case BUILT_IN_ATOMIC_XOR_FETCH_4:
+ case BUILT_IN_ATOMIC_XOR_FETCH_8:
+ case BUILT_IN_ATOMIC_XOR_FETCH_16:
+ {
+ enum built_in_function lib;
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_XOR_FETCH_1);
+ lib = (enum built_in_function)((int)BUILT_IN_ATOMIC_FETCH_XOR_1 +
+ (fcode - BUILT_IN_ATOMIC_XOR_FETCH_1));
+ target = expand_builtin_atomic_fetch_op (mode, exp, target, XOR, true,
+ ignore, lib);
+ if (target)
+ return target;
+ break;
+ }
+ case BUILT_IN_ATOMIC_OR_FETCH_1:
+ case BUILT_IN_ATOMIC_OR_FETCH_2:
+ case BUILT_IN_ATOMIC_OR_FETCH_4:
+ case BUILT_IN_ATOMIC_OR_FETCH_8:
+ case BUILT_IN_ATOMIC_OR_FETCH_16:
+ {
+ enum built_in_function lib;
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_OR_FETCH_1);
+ lib = (enum built_in_function)((int)BUILT_IN_ATOMIC_FETCH_OR_1 +
+ (fcode - BUILT_IN_ATOMIC_OR_FETCH_1));
+ target = expand_builtin_atomic_fetch_op (mode, exp, target, IOR, true,
+ ignore, lib);
+ if (target)
+ return target;
break;
- default:
- gcc_unreachable ();
}
+ case BUILT_IN_ATOMIC_FETCH_ADD_1:
+ case BUILT_IN_ATOMIC_FETCH_ADD_2:
+ case BUILT_IN_ATOMIC_FETCH_ADD_4:
+ case BUILT_IN_ATOMIC_FETCH_ADD_8:
+ case BUILT_IN_ATOMIC_FETCH_ADD_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_FETCH_ADD_1);
+ target = expand_builtin_atomic_fetch_op (mode, exp, target, PLUS, false,
+ ignore, BUILT_IN_NONE);
+ if (target)
+ return target;
+ break;
+
+ case BUILT_IN_ATOMIC_FETCH_SUB_1:
+ case BUILT_IN_ATOMIC_FETCH_SUB_2:
+ case BUILT_IN_ATOMIC_FETCH_SUB_4:
+ case BUILT_IN_ATOMIC_FETCH_SUB_8:
+ case BUILT_IN_ATOMIC_FETCH_SUB_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_FETCH_SUB_1);
+ target = expand_builtin_atomic_fetch_op (mode, exp, target, MINUS, false,
+ ignore, BUILT_IN_NONE);
+ if (target)
+ return target;
+ break;
- /* Create the COMPOUND_EXPR (*arg1 = trunc, frac). */
- arg1 = fold_build2_loc (loc, MODIFY_EXPR, rettype, arg1, exp);
- TREE_SIDE_EFFECTS (arg1) = 1;
- return fold_build2_loc (loc, COMPOUND_EXPR, rettype, arg1, frac);
- }
+ case BUILT_IN_ATOMIC_FETCH_AND_1:
+ case BUILT_IN_ATOMIC_FETCH_AND_2:
+ case BUILT_IN_ATOMIC_FETCH_AND_4:
+ case BUILT_IN_ATOMIC_FETCH_AND_8:
+ case BUILT_IN_ATOMIC_FETCH_AND_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_FETCH_AND_1);
+ target = expand_builtin_atomic_fetch_op (mode, exp, target, AND, false,
+ ignore, BUILT_IN_NONE);
+ if (target)
+ return target;
+ break;
+
+ case BUILT_IN_ATOMIC_FETCH_NAND_1:
+ case BUILT_IN_ATOMIC_FETCH_NAND_2:
+ case BUILT_IN_ATOMIC_FETCH_NAND_4:
+ case BUILT_IN_ATOMIC_FETCH_NAND_8:
+ case BUILT_IN_ATOMIC_FETCH_NAND_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_FETCH_NAND_1);
+ target = expand_builtin_atomic_fetch_op (mode, exp, target, NOT, false,
+ ignore, BUILT_IN_NONE);
+ if (target)
+ return target;
+ break;
+
+ case BUILT_IN_ATOMIC_FETCH_XOR_1:
+ case BUILT_IN_ATOMIC_FETCH_XOR_2:
+ case BUILT_IN_ATOMIC_FETCH_XOR_4:
+ case BUILT_IN_ATOMIC_FETCH_XOR_8:
+ case BUILT_IN_ATOMIC_FETCH_XOR_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_FETCH_XOR_1);
+ target = expand_builtin_atomic_fetch_op (mode, exp, target, XOR, false,
+ ignore, BUILT_IN_NONE);
+ if (target)
+ return target;
+ break;
+
+ case BUILT_IN_ATOMIC_FETCH_OR_1:
+ case BUILT_IN_ATOMIC_FETCH_OR_2:
+ case BUILT_IN_ATOMIC_FETCH_OR_4:
+ case BUILT_IN_ATOMIC_FETCH_OR_8:
+ case BUILT_IN_ATOMIC_FETCH_OR_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_ATOMIC_FETCH_OR_1);
+ target = expand_builtin_atomic_fetch_op (mode, exp, target, IOR, false,
+ ignore, BUILT_IN_NONE);
+ if (target)
+ return target;
+ break;
- return NULL_TREE;
-}
+ case BUILT_IN_ATOMIC_TEST_AND_SET:
+ return expand_builtin_atomic_test_and_set (exp, target);
-/* Fold a call to builtin modf. */
+ case BUILT_IN_ATOMIC_CLEAR:
+ return expand_builtin_atomic_clear (exp);
+
+ case BUILT_IN_ATOMIC_ALWAYS_LOCK_FREE:
+ return expand_builtin_atomic_always_lock_free (exp);
-static tree
-fold_builtin_modf (location_t loc, tree arg0, tree arg1, tree rettype)
-{
- if (! validate_arg (arg0, REAL_TYPE) || ! validate_arg (arg1, POINTER_TYPE))
- return NULL_TREE;
+ case BUILT_IN_ATOMIC_IS_LOCK_FREE:
+ target = expand_builtin_atomic_is_lock_free (exp);
+ if (target)
+ return target;
+ break;
- STRIP_NOPS (arg0);
+ case BUILT_IN_ATOMIC_THREAD_FENCE:
+ expand_builtin_atomic_thread_fence (exp);
+ return const0_rtx;
- if (!(TREE_CODE (arg0) == REAL_CST && ! TREE_OVERFLOW (arg0)))
- return NULL_TREE;
+ case BUILT_IN_ATOMIC_SIGNAL_FENCE:
+ expand_builtin_atomic_signal_fence (exp);
+ return const0_rtx;
- arg1 = build_fold_indirect_ref_loc (loc, arg1);
+ case BUILT_IN_OBJECT_SIZE:
+ return expand_builtin_object_size (exp);
- /* Proceed if a valid pointer type was passed in. */
- if (TYPE_MAIN_VARIANT (TREE_TYPE (arg1)) == TYPE_MAIN_VARIANT (rettype))
- {
- const REAL_VALUE_TYPE *const value = TREE_REAL_CST_PTR (arg0);
- REAL_VALUE_TYPE trunc, frac;
+ case BUILT_IN_MEMCPY_CHK:
+ case BUILT_IN_MEMPCPY_CHK:
+ case BUILT_IN_MEMMOVE_CHK:
+ case BUILT_IN_MEMSET_CHK:
+ target = expand_builtin_memory_chk (exp, target, mode, fcode);
+ if (target)
+ return target;
+ break;
- switch (value->cl)
- {
- case rvc_nan:
- case rvc_zero:
- /* For +-NaN or +-0, return (*arg1 = arg0, arg0). */
- trunc = frac = *value;
- break;
- case rvc_inf:
- /* For +-Inf, return (*arg1 = arg0, +-0). */
- frac = dconst0;
- frac.sign = value->sign;
- trunc = *value;
- break;
- case rvc_normal:
- /* Return (*arg1 = trunc(arg0), arg0-trunc(arg0)). */
- real_trunc (&trunc, VOIDmode, value);
- real_arithmetic (&frac, MINUS_EXPR, value, &trunc);
- /* If the original number was negative and already
- integral, then the fractional part is -0.0. */
- if (value->sign && frac.cl == rvc_zero)
- frac.sign = value->sign;
- break;
- }
+ case BUILT_IN_STRCPY_CHK:
+ case BUILT_IN_STPCPY_CHK:
+ case BUILT_IN_STRNCPY_CHK:
+ case BUILT_IN_STPNCPY_CHK:
+ case BUILT_IN_STRCAT_CHK:
+ case BUILT_IN_STRNCAT_CHK:
+ case BUILT_IN_SNPRINTF_CHK:
+ case BUILT_IN_VSNPRINTF_CHK:
+ maybe_emit_chk_warning (exp, fcode);
+ break;
+
+ case BUILT_IN_SPRINTF_CHK:
+ case BUILT_IN_VSPRINTF_CHK:
+ maybe_emit_sprintf_chk_warning (exp, fcode);
+ break;
- /* Create the COMPOUND_EXPR (*arg1 = trunc, frac). */
- arg1 = fold_build2_loc (loc, MODIFY_EXPR, rettype, arg1,
- build_real (rettype, trunc));
- TREE_SIDE_EFFECTS (arg1) = 1;
- return fold_build2_loc (loc, COMPOUND_EXPR, rettype, arg1,
- build_real (rettype, frac));
+ case BUILT_IN_THREAD_POINTER:
+ return expand_builtin_thread_pointer (exp, target);
+
+ case BUILT_IN_SET_THREAD_POINTER:
+ expand_builtin_set_thread_pointer (exp);
+ return const0_rtx;
+
+ case BUILT_IN_ACC_ON_DEVICE:
+ /* Do library call, if we failed to expand the builtin when
+ folding. */
+ break;
+
+ case BUILT_IN_GOACC_PARLEVEL_ID:
+ case BUILT_IN_GOACC_PARLEVEL_SIZE:
+ return expand_builtin_goacc_parlevel_id_size (exp, target, ignore);
+
+ case BUILT_IN_SPECULATION_SAFE_VALUE_PTR:
+ return expand_speculation_safe_value (VOIDmode, exp, target, ignore);
+
+ case BUILT_IN_SPECULATION_SAFE_VALUE_1:
+ case BUILT_IN_SPECULATION_SAFE_VALUE_2:
+ case BUILT_IN_SPECULATION_SAFE_VALUE_4:
+ case BUILT_IN_SPECULATION_SAFE_VALUE_8:
+ case BUILT_IN_SPECULATION_SAFE_VALUE_16:
+ mode = get_builtin_sync_mode (fcode - BUILT_IN_SPECULATION_SAFE_VALUE_1);
+ return expand_speculation_safe_value (mode, exp, target, ignore);
+
+ default: /* just do library call, if unknown builtin */
+ break;
}
- return NULL_TREE;
+ /* The switch statement above can drop through to cause the function
+ to be called normally. */
+ return expand_call (exp, target, ignore);
}
-/* Given a location LOC, an interclass builtin function decl FNDECL
- and its single argument ARG, return an folded expression computing
- the same, or NULL_TREE if we either couldn't or didn't want to fold
- (the latter happen if there's an RTL instruction available). */
+/* Determine whether a tree node represents a call to a built-in
+ function. If the tree T is a call to a built-in function with
+ the right number of arguments of the appropriate types, return
+ the DECL_FUNCTION_CODE of the call, e.g. BUILT_IN_SQRT.
+ Otherwise the return value is END_BUILTINS. */
-static tree
-fold_builtin_interclass_mathfn (location_t loc, tree fndecl, tree arg)
+enum built_in_function
+builtin_mathfn_code (const_tree t)
{
- machine_mode mode;
-
- if (!validate_arg (arg, REAL_TYPE))
- return NULL_TREE;
-
- if (interclass_mathfn_icode (arg, fndecl) != CODE_FOR_nothing)
- return NULL_TREE;
+ const_tree fndecl, arg, parmlist;
+ const_tree argtype, parmtype;
+ const_call_expr_arg_iterator iter;
- mode = TYPE_MODE (TREE_TYPE (arg));
+ if (TREE_CODE (t) != CALL_EXPR)
+ return END_BUILTINS;
- bool is_ibm_extended = MODE_COMPOSITE_P (mode);
+ fndecl = get_callee_fndecl (t);
+ if (fndecl == NULL_TREE || !fndecl_built_in_p (fndecl, BUILT_IN_NORMAL))
+ return END_BUILTINS;
- /* If there is no optab, try generic code. */
- switch (DECL_FUNCTION_CODE (fndecl))
+ parmlist = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
+ init_const_call_expr_arg_iterator (t, &iter);
+ for (; parmlist; parmlist = TREE_CHAIN (parmlist))
{
- tree result;
+ /* If a function doesn't take a variable number of arguments,
+ the last element in the list will have type `void'. */
+ parmtype = TREE_VALUE (parmlist);
+ if (VOID_TYPE_P (parmtype))
+ {
+ if (more_const_call_expr_args_p (&iter))
+ return END_BUILTINS;
+ return DECL_FUNCTION_CODE (fndecl);
+ }
- CASE_FLT_FN (BUILT_IN_ISINF):
- {
- /* isinf(x) -> isgreater(fabs(x),DBL_MAX). */
- tree const isgr_fn = builtin_decl_explicit (BUILT_IN_ISGREATER);
- tree type = TREE_TYPE (arg);
- REAL_VALUE_TYPE r;
- char buf[128];
+ if (! more_const_call_expr_args_p (&iter))
+ return END_BUILTINS;
- if (is_ibm_extended)
- {
- /* NaN and Inf are encoded in the high-order double value
- only. The low-order value is not significant. */
- type = double_type_node;
- mode = DFmode;
- arg = fold_build1_loc (loc, NOP_EXPR, type, arg);
- }
- get_max_float (REAL_MODE_FORMAT (mode), buf, sizeof (buf), false);
- real_from_string (&r, buf);
- result = build_call_expr (isgr_fn, 2,
- fold_build1_loc (loc, ABS_EXPR, type, arg),
- build_real (type, r));
- return result;
- }
- CASE_FLT_FN (BUILT_IN_FINITE):
- case BUILT_IN_ISFINITE:
- {
- /* isfinite(x) -> islessequal(fabs(x),DBL_MAX). */
- tree const isle_fn = builtin_decl_explicit (BUILT_IN_ISLESSEQUAL);
- tree type = TREE_TYPE (arg);
- REAL_VALUE_TYPE r;
- char buf[128];
+ arg = next_const_call_expr_arg (&iter);
+ argtype = TREE_TYPE (arg);
- if (is_ibm_extended)
- {
- /* NaN and Inf are encoded in the high-order double value
- only. The low-order value is not significant. */
- type = double_type_node;
- mode = DFmode;
- arg = fold_build1_loc (loc, NOP_EXPR, type, arg);
- }
- get_max_float (REAL_MODE_FORMAT (mode), buf, sizeof (buf), false);
- real_from_string (&r, buf);
- result = build_call_expr (isle_fn, 2,
- fold_build1_loc (loc, ABS_EXPR, type, arg),
- build_real (type, r));
- /*result = fold_build2_loc (loc, UNGT_EXPR,
- TREE_TYPE (TREE_TYPE (fndecl)),
- fold_build1_loc (loc, ABS_EXPR, type, arg),
- build_real (type, r));
- result = fold_build1_loc (loc, TRUTH_NOT_EXPR,
- TREE_TYPE (TREE_TYPE (fndecl)),
- result);*/
- return result;
- }
- case BUILT_IN_ISNORMAL:
- {
- /* isnormal(x) -> isgreaterequal(fabs(x),DBL_MIN) &
- islessequal(fabs(x),DBL_MAX). */
- tree const isle_fn = builtin_decl_explicit (BUILT_IN_ISLESSEQUAL);
- tree type = TREE_TYPE (arg);
- tree orig_arg, max_exp, min_exp;
- machine_mode orig_mode = mode;
- REAL_VALUE_TYPE rmax, rmin;
- char buf[128];
+ if (SCALAR_FLOAT_TYPE_P (parmtype))
+ {
+ if (! SCALAR_FLOAT_TYPE_P (argtype))
+ return END_BUILTINS;
+ }
+ else if (COMPLEX_FLOAT_TYPE_P (parmtype))
+ {
+ if (! COMPLEX_FLOAT_TYPE_P (argtype))
+ return END_BUILTINS;
+ }
+ else if (POINTER_TYPE_P (parmtype))
+ {
+ if (! POINTER_TYPE_P (argtype))
+ return END_BUILTINS;
+ }
+ else if (INTEGRAL_TYPE_P (parmtype))
+ {
+ if (! INTEGRAL_TYPE_P (argtype))
+ return END_BUILTINS;
+ }
+ else
+ return END_BUILTINS;
+ }
- orig_arg = arg = builtin_save_expr (arg);
- if (is_ibm_extended)
- {
- /* Use double to test the normal range of IBM extended
- precision. Emin for IBM extended precision is
- different to emin for IEEE double, being 53 higher
- since the low double exponent is at least 53 lower
- than the high double exponent. */
- type = double_type_node;
- mode = DFmode;
- arg = fold_build1_loc (loc, NOP_EXPR, type, arg);
- }
- arg = fold_build1_loc (loc, ABS_EXPR, type, arg);
+ /* Variable-length argument list. */
+ return DECL_FUNCTION_CODE (fndecl);
+}
- get_max_float (REAL_MODE_FORMAT (mode), buf, sizeof (buf), false);
- real_from_string (&rmax, buf);
- sprintf (buf, "0x1p%d", REAL_MODE_FORMAT (orig_mode)->emin - 1);
- real_from_string (&rmin, buf);
- max_exp = build_real (type, rmax);
- min_exp = build_real (type, rmin);
+/* Fold a call to __builtin_constant_p, if we know its argument ARG will
+ evaluate to a constant. */
- max_exp = build_call_expr (isle_fn, 2, arg, max_exp);
- if (is_ibm_extended)
- {
- /* Testing the high end of the range is done just using
- the high double, using the same test as isfinite().
- For the subnormal end of the range we first test the
- high double, then if its magnitude is equal to the
- limit of 0x1p-969, we test whether the low double is
- non-zero and opposite sign to the high double. */
- tree const islt_fn = builtin_decl_explicit (BUILT_IN_ISLESS);
- tree const isgt_fn = builtin_decl_explicit (BUILT_IN_ISGREATER);
- tree gt_min = build_call_expr (isgt_fn, 2, arg, min_exp);
- tree eq_min = fold_build2 (EQ_EXPR, integer_type_node,
- arg, min_exp);
- tree as_complex = build1 (VIEW_CONVERT_EXPR,
- complex_double_type_node, orig_arg);
- tree hi_dbl = build1 (REALPART_EXPR, type, as_complex);
- tree lo_dbl = build1 (IMAGPART_EXPR, type, as_complex);
- tree zero = build_real (type, dconst0);
- tree hilt = build_call_expr (islt_fn, 2, hi_dbl, zero);
- tree lolt = build_call_expr (islt_fn, 2, lo_dbl, zero);
- tree logt = build_call_expr (isgt_fn, 2, lo_dbl, zero);
- tree ok_lo = fold_build1 (TRUTH_NOT_EXPR, integer_type_node,
- fold_build3 (COND_EXPR,
- integer_type_node,
- hilt, logt, lolt));
- eq_min = fold_build2 (TRUTH_ANDIF_EXPR, integer_type_node,
- eq_min, ok_lo);
- min_exp = fold_build2 (TRUTH_ORIF_EXPR, integer_type_node,
- gt_min, eq_min);
- }
- else
- {
- tree const isge_fn
- = builtin_decl_explicit (BUILT_IN_ISGREATEREQUAL);
- min_exp = build_call_expr (isge_fn, 2, arg, min_exp);
- }
- result = fold_build2 (BIT_AND_EXPR, integer_type_node,
- max_exp, min_exp);
- return result;
- }
- default:
- break;
+static tree
+fold_builtin_constant_p (tree arg)
+{
+ /* We return 1 for a numeric type that's known to be a constant
+ value at compile-time or for an aggregate type that's a
+ literal constant. */
+ STRIP_NOPS (arg);
+
+ /* If we know this is a constant, emit the constant of one. */
+ if (CONSTANT_CLASS_P (arg)
+ || (TREE_CODE (arg) == CONSTRUCTOR
+ && TREE_CONSTANT (arg)))
+ return integer_one_node;
+ if (TREE_CODE (arg) == ADDR_EXPR)
+ {
+ tree op = TREE_OPERAND (arg, 0);
+ if (TREE_CODE (op) == STRING_CST
+ || (TREE_CODE (op) == ARRAY_REF
+ && integer_zerop (TREE_OPERAND (op, 1))
+ && TREE_CODE (TREE_OPERAND (op, 0)) == STRING_CST))
+ return integer_one_node;
}
+ /* If this expression has side effects, show we don't know it to be a
+ constant. Likewise if it's a pointer or aggregate type since in
+ those case we only want literals, since those are only optimized
+ when generating RTL, not later.
+ And finally, if we are compiling an initializer, not code, we
+ need to return a definite result now; there's not going to be any
+ more optimization done. */
+ if (TREE_SIDE_EFFECTS (arg)
+ || AGGREGATE_TYPE_P (TREE_TYPE (arg))
+ || POINTER_TYPE_P (TREE_TYPE (arg))
+ || cfun == 0
+ || folding_initializer
+ || force_folding_builtin_constant_p)
+ return integer_zero_node;
+
return NULL_TREE;
}
-/* Fold a call to __builtin_isnan(), __builtin_isinf, __builtin_finite.
- ARG is the argument for the call. */
+/* Create builtin_expect or builtin_expect_with_probability
+ with PRED and EXPECTED as its arguments and return it as a truthvalue.
+ Fortran FE can also produce builtin_expect with PREDICTOR as third argument.
+ builtin_expect_with_probability instead uses third argument as PROBABILITY
+ value. */
static tree
-fold_builtin_classify (location_t loc, tree fndecl, tree arg, int builtin_index)
+build_builtin_expect_predicate (location_t loc, tree pred, tree expected,
+ tree predictor, tree probability)
{
- tree type = TREE_TYPE (TREE_TYPE (fndecl));
+ tree fn, arg_types, pred_type, expected_type, call_expr, ret_type;
- if (!validate_arg (arg, REAL_TYPE))
- return NULL_TREE;
+ fn = builtin_decl_explicit (probability == NULL_TREE ? BUILT_IN_EXPECT
+ : BUILT_IN_EXPECT_WITH_PROBABILITY);
+ arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
+ ret_type = TREE_TYPE (TREE_TYPE (fn));
+ pred_type = TREE_VALUE (arg_types);
+ expected_type = TREE_VALUE (TREE_CHAIN (arg_types));
- switch (builtin_index)
- {
- case BUILT_IN_ISINF:
- if (tree_expr_infinite_p (arg))
- return omit_one_operand_loc (loc, type, integer_one_node, arg);
- if (!tree_expr_maybe_infinite_p (arg))
- return omit_one_operand_loc (loc, type, integer_zero_node, arg);
- return NULL_TREE;
+ pred = fold_convert_loc (loc, pred_type, pred);
+ expected = fold_convert_loc (loc, expected_type, expected);
- case BUILT_IN_ISINF_SIGN:
- {
- /* isinf_sign(x) -> isinf(x) ? (signbit(x) ? -1 : 1) : 0 */
- /* In a boolean context, GCC will fold the inner COND_EXPR to
- 1. So e.g. "if (isinf_sign(x))" would be folded to just
- "if (isinf(x) ? 1 : 0)" which becomes "if (isinf(x))". */
- tree signbit_fn = builtin_decl_explicit (BUILT_IN_SIGNBIT);
- tree isinf_fn = builtin_decl_explicit (BUILT_IN_ISINF);
- tree tmp = NULL_TREE;
+ if (probability)
+ call_expr = build_call_expr_loc (loc, fn, 3, pred, expected, probability);
+ else
+ call_expr = build_call_expr_loc (loc, fn, predictor ? 3 : 2, pred, expected,
+ predictor);
- arg = builtin_save_expr (arg);
+ return build2 (NE_EXPR, TREE_TYPE (pred), call_expr,
+ build_int_cst (ret_type, 0));
+}
- if (signbit_fn && isinf_fn)
- {
- tree signbit_call = build_call_expr_loc (loc, signbit_fn, 1, arg);
- tree isinf_call = build_call_expr_loc (loc, isinf_fn, 1, arg);
+/* Fold a call to builtin_expect with arguments ARG0, ARG1, ARG2, ARG3. Return
+ NULL_TREE if no simplification is possible. */
- signbit_call = fold_build2_loc (loc, NE_EXPR, integer_type_node,
- signbit_call, integer_zero_node);
- isinf_call = fold_build2_loc (loc, NE_EXPR, integer_type_node,
- isinf_call, integer_zero_node);
+tree
+fold_builtin_expect (location_t loc, tree arg0, tree arg1, tree arg2,
+ tree arg3)
+{
+ tree inner, fndecl, inner_arg0;
+ enum tree_code code;
- tmp = fold_build3_loc (loc, COND_EXPR, integer_type_node, signbit_call,
- integer_minus_one_node, integer_one_node);
- tmp = fold_build3_loc (loc, COND_EXPR, integer_type_node,
- isinf_call, tmp,
- integer_zero_node);
- }
+ /* Distribute the expected value over short-circuiting operators.
+ See through the cast from truthvalue_type_node to long. */
+ inner_arg0 = arg0;
+ while (CONVERT_EXPR_P (inner_arg0)
+ && INTEGRAL_TYPE_P (TREE_TYPE (inner_arg0))
+ && INTEGRAL_TYPE_P (TREE_TYPE (TREE_OPERAND (inner_arg0, 0))))
+ inner_arg0 = TREE_OPERAND (inner_arg0, 0);
- return tmp;
- }
+ /* If this is a builtin_expect within a builtin_expect keep the
+ inner one. See through a comparison against a constant. It
+ might have been added to create a thruthvalue. */
+ inner = inner_arg0;
- case BUILT_IN_ISFINITE:
- if (tree_expr_finite_p (arg))
- return omit_one_operand_loc (loc, type, integer_one_node, arg);
- if (tree_expr_nan_p (arg) || tree_expr_infinite_p (arg))
- return omit_one_operand_loc (loc, type, integer_zero_node, arg);
- return NULL_TREE;
+ if (COMPARISON_CLASS_P (inner)
+ && TREE_CODE (TREE_OPERAND (inner, 1)) == INTEGER_CST)
+ inner = TREE_OPERAND (inner, 0);
- case BUILT_IN_ISNAN:
- if (tree_expr_nan_p (arg))
- return omit_one_operand_loc (loc, type, integer_one_node, arg);
- if (!tree_expr_maybe_nan_p (arg))
- return omit_one_operand_loc (loc, type, integer_zero_node, arg);
+ if (TREE_CODE (inner) == CALL_EXPR
+ && (fndecl = get_callee_fndecl (inner))
+ && (fndecl_built_in_p (fndecl, BUILT_IN_EXPECT)
+ || fndecl_built_in_p (fndecl, BUILT_IN_EXPECT_WITH_PROBABILITY)))
+ return arg0;
- {
- bool is_ibm_extended = MODE_COMPOSITE_P (TYPE_MODE (TREE_TYPE (arg)));
- if (is_ibm_extended)
- {
- /* NaN and Inf are encoded in the high-order double value
- only. The low-order value is not significant. */
- arg = fold_build1_loc (loc, NOP_EXPR, double_type_node, arg);
- }
- }
- arg = builtin_save_expr (arg);
- return fold_build2_loc (loc, UNORDERED_EXPR, type, arg, arg);
+ inner = inner_arg0;
+ code = TREE_CODE (inner);
+ if (code == TRUTH_ANDIF_EXPR || code == TRUTH_ORIF_EXPR)
+ {
+ tree op0 = TREE_OPERAND (inner, 0);
+ tree op1 = TREE_OPERAND (inner, 1);
+ arg1 = save_expr (arg1);
- default:
- gcc_unreachable ();
+ op0 = build_builtin_expect_predicate (loc, op0, arg1, arg2, arg3);
+ op1 = build_builtin_expect_predicate (loc, op1, arg1, arg2, arg3);
+ inner = build2 (code, TREE_TYPE (inner), op0, op1);
+
+ return fold_convert_loc (loc, TREE_TYPE (arg0), inner);
+ }
+
+ /* If the argument isn't invariant then there's nothing else we can do. */
+ if (!TREE_CONSTANT (inner_arg0))
+ return NULL_TREE;
+
+ /* If we expect that a comparison against the argument will fold to
+ a constant return the constant. In practice, this means a true
+ constant or the address of a non-weak symbol. */
+ inner = inner_arg0;
+ STRIP_NOPS (inner);
+ if (TREE_CODE (inner) == ADDR_EXPR)
+ {
+ do
+ {
+ inner = TREE_OPERAND (inner, 0);
+ }
+ while (TREE_CODE (inner) == COMPONENT_REF
+ || TREE_CODE (inner) == ARRAY_REF);
+ if (VAR_OR_FUNCTION_DECL_P (inner) && DECL_WEAK (inner))
+ return NULL_TREE;
}
+
+ /* Otherwise, ARG0 already has the proper type for the return value. */
+ return arg0;
}
-/* Fold a call to __builtin_fpclassify(int, int, int, int, int, ...).
- This builtin will generate code to return the appropriate floating
- point classification depending on the value of the floating point
- number passed in. The possible return values must be supplied as
- int arguments to the call in the following order: FP_NAN, FP_INFINITE,
- FP_NORMAL, FP_SUBNORMAL and FP_ZERO. The ellipses is for exactly
- one floating point argument which is "type generic". */
+/* Fold a call to __builtin_classify_type with argument ARG. */
static tree
-fold_builtin_fpclassify (location_t loc, tree *args, int nargs)
+fold_builtin_classify_type (tree arg)
{
- tree fp_nan, fp_infinite, fp_normal, fp_subnormal, fp_zero,
- arg, type, res, tmp;
- machine_mode mode;
- REAL_VALUE_TYPE r;
- char buf[128];
+ if (arg == 0)
+ return build_int_cst (integer_type_node, no_type_class);
- /* Verify the required arguments in the original call. */
- if (nargs != 6
- || !validate_arg (args[0], INTEGER_TYPE)
- || !validate_arg (args[1], INTEGER_TYPE)
- || !validate_arg (args[2], INTEGER_TYPE)
- || !validate_arg (args[3], INTEGER_TYPE)
- || !validate_arg (args[4], INTEGER_TYPE)
- || !validate_arg (args[5], REAL_TYPE))
+ return build_int_cst (integer_type_node, type_to_class (TREE_TYPE (arg)));
+}
+
+/* Fold a call EXPR (which may be null) to __builtin_strlen with argument
+ ARG. */
+
+static tree
+fold_builtin_strlen (location_t loc, tree expr, tree type, tree arg)
+{
+ if (!validate_arg (arg, POINTER_TYPE))
return NULL_TREE;
+ else
+ {
+ c_strlen_data lendata = { };
+ tree len = c_strlen (arg, 0, &lendata);
- fp_nan = args[0];
- fp_infinite = args[1];
- fp_normal = args[2];
- fp_subnormal = args[3];
- fp_zero = args[4];
- arg = args[5];
- type = TREE_TYPE (arg);
- mode = TYPE_MODE (type);
- arg = builtin_save_expr (fold_build1_loc (loc, ABS_EXPR, type, arg));
+ if (len)
+ return fold_convert_loc (loc, type, len);
+
+ if (!lendata.decl)
+ c_strlen (arg, 1, &lendata);
+
+ if (lendata.decl)
+ {
+ if (EXPR_HAS_LOCATION (arg))
+ loc = EXPR_LOCATION (arg);
+ else if (loc == UNKNOWN_LOCATION)
+ loc = input_location;
+ warn_string_no_nul (loc, expr, "strlen", arg, lendata.decl);
+ }
+
+ return NULL_TREE;
+ }
+}
+
+/* Fold a call to __builtin_inf or __builtin_huge_val. */
+
+static tree
+fold_builtin_inf (location_t loc, tree type, int warn)
+{
+ REAL_VALUE_TYPE real;
+
+ /* __builtin_inff is intended to be usable to define INFINITY on all
+ targets. If an infinity is not available, INFINITY expands "to a
+ positive constant of type float that overflows at translation
+ time", footnote "In this case, using INFINITY will violate the
+ constraint in 6.4.4 and thus require a diagnostic." (C99 7.12#4).
+ Thus we pedwarn to ensure this constraint violation is
+ diagnosed. */
+ if (!MODE_HAS_INFINITIES (TYPE_MODE (type)) && warn)
+ pedwarn (loc, 0, "target format does not support infinity");
- /* fpclassify(x) ->
- isnan(x) ? FP_NAN :
- (fabs(x) == Inf ? FP_INFINITE :
- (fabs(x) >= DBL_MIN ? FP_NORMAL :
- (x == 0 ? FP_ZERO : FP_SUBNORMAL))). */
+ real_inf (&real);
+ return build_real (type, real);
+}
- tmp = fold_build2_loc (loc, EQ_EXPR, integer_type_node, arg,
- build_real (type, dconst0));
- res = fold_build3_loc (loc, COND_EXPR, integer_type_node,
- tmp, fp_zero, fp_subnormal);
+/* Fold function call to builtin sincos, sincosf, or sincosl. Return
+ NULL_TREE if no simplification can be made. */
- sprintf (buf, "0x1p%d", REAL_MODE_FORMAT (mode)->emin - 1);
- real_from_string (&r, buf);
- tmp = fold_build2_loc (loc, GE_EXPR, integer_type_node,
- arg, build_real (type, r));
- res = fold_build3_loc (loc, COND_EXPR, integer_type_node, tmp, fp_normal, res);
+static tree
+fold_builtin_sincos (location_t loc,
+ tree arg0, tree arg1, tree arg2)
+{
+ tree type;
+ tree fndecl, call = NULL_TREE;
- if (tree_expr_maybe_infinite_p (arg))
+ if (!validate_arg (arg0, REAL_TYPE)
+ || !validate_arg (arg1, POINTER_TYPE)
+ || !validate_arg (arg2, POINTER_TYPE))
+ return NULL_TREE;
+
+ type = TREE_TYPE (arg0);
+
+ /* Calculate the result when the argument is a constant. */
+ built_in_function fn = mathfn_built_in_2 (type, CFN_BUILT_IN_CEXPI);
+ if (fn == END_BUILTINS)
+ return NULL_TREE;
+
+ /* Canonicalize sincos to cexpi. */
+ if (TREE_CODE (arg0) == REAL_CST)
{
- real_inf (&r);
- tmp = fold_build2_loc (loc, EQ_EXPR, integer_type_node, arg,
- build_real (type, r));
- res = fold_build3_loc (loc, COND_EXPR, integer_type_node, tmp,
- fp_infinite, res);
+ tree complex_type = build_complex_type (type);
+ call = fold_const_call (as_combined_fn (fn), complex_type, arg0);
}
-
- if (tree_expr_maybe_nan_p (arg))
+ if (!call)
{
- tmp = fold_build2_loc (loc, ORDERED_EXPR, integer_type_node, arg, arg);
- res = fold_build3_loc (loc, COND_EXPR, integer_type_node, tmp, res, fp_nan);
+ if (!targetm.libc_has_function (function_c99_math_complex, type)
+ || !builtin_decl_implicit_p (fn))
+ return NULL_TREE;
+ fndecl = builtin_decl_explicit (fn);
+ call = build_call_expr_loc (loc, fndecl, 1, arg0);
+ call = builtin_save_expr (call);
}
- return res;
+ tree ptype = build_pointer_type (type);
+ arg1 = fold_convert (ptype, arg1);
+ arg2 = fold_convert (ptype, arg2);
+ return build2 (COMPOUND_EXPR, void_type_node,
+ build2 (MODIFY_EXPR, void_type_node,
+ build_fold_indirect_ref_loc (loc, arg1),
+ fold_build1_loc (loc, IMAGPART_EXPR, type, call)),
+ build2 (MODIFY_EXPR, void_type_node,
+ build_fold_indirect_ref_loc (loc, arg2),
+ fold_build1_loc (loc, REALPART_EXPR, type, call)));
}
-/* Fold a call to an unordered comparison function such as
- __builtin_isgreater(). FNDECL is the FUNCTION_DECL for the function
- being called and ARG0 and ARG1 are the arguments for the call.
- UNORDERED_CODE and ORDERED_CODE are comparison codes that give
- the opposite of the desired result. UNORDERED_CODE is used
- for modes that can hold NaNs and ORDERED_CODE is used for
- the rest. */
+/* Fold function call to builtin memcmp with arguments ARG1 and ARG2.
+ Return NULL_TREE if no simplification can be made. */
static tree
-fold_builtin_unordered_cmp (location_t loc, tree fndecl, tree arg0, tree arg1,
- enum tree_code unordered_code,
- enum tree_code ordered_code)
+fold_builtin_memcmp (location_t loc, tree arg1, tree arg2, tree len)
{
- tree type = TREE_TYPE (TREE_TYPE (fndecl));
- enum tree_code code;
- tree type0, type1;
- enum tree_code code0, code1;
- tree cmp_type = NULL_TREE;
-
- type0 = TREE_TYPE (arg0);
- type1 = TREE_TYPE (arg1);
-
- code0 = TREE_CODE (type0);
- code1 = TREE_CODE (type1);
+ if (!validate_arg (arg1, POINTER_TYPE)
+ || !validate_arg (arg2, POINTER_TYPE)
+ || !validate_arg (len, INTEGER_TYPE))
+ return NULL_TREE;
- if (code0 == REAL_TYPE && code1 == REAL_TYPE)
- /* Choose the wider of two real types. */
- cmp_type = TYPE_PRECISION (type0) >= TYPE_PRECISION (type1)
- ? type0 : type1;
- else if (code0 == REAL_TYPE && code1 == INTEGER_TYPE)
- cmp_type = type0;
- else if (code0 == INTEGER_TYPE && code1 == REAL_TYPE)
- cmp_type = type1;
+ /* If the LEN parameter is zero, return zero. */
+ if (integer_zerop (len))
+ return omit_two_operands_loc (loc, integer_type_node, integer_zero_node,
+ arg1, arg2);
- arg0 = fold_convert_loc (loc, cmp_type, arg0);
- arg1 = fold_convert_loc (loc, cmp_type, arg1);
+ /* If ARG1 and ARG2 are the same (and not volatile), return zero. */
+ if (operand_equal_p (arg1, arg2, 0))
+ return omit_one_operand_loc (loc, integer_type_node, integer_zero_node, len);
- if (unordered_code == UNORDERED_EXPR)
+ /* If len parameter is one, return an expression corresponding to
+ (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
+ if (tree_fits_uhwi_p (len) && tree_to_uhwi (len) == 1)
{
- if (tree_expr_nan_p (arg0) || tree_expr_nan_p (arg1))
- return omit_two_operands_loc (loc, type, integer_one_node, arg0, arg1);
- if (!tree_expr_maybe_nan_p (arg0) && !tree_expr_maybe_nan_p (arg1))
- return omit_two_operands_loc (loc, type, integer_zero_node, arg0, arg1);
- return fold_build2_loc (loc, UNORDERED_EXPR, type, arg0, arg1);
+ tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
+ tree cst_uchar_ptr_node
+ = build_pointer_type_for_mode (cst_uchar_node, ptr_mode, true);
+
+ tree ind1
+ = fold_convert_loc (loc, integer_type_node,
+ build1 (INDIRECT_REF, cst_uchar_node,
+ fold_convert_loc (loc,
+ cst_uchar_ptr_node,
+ arg1)));
+ tree ind2
+ = fold_convert_loc (loc, integer_type_node,
+ build1 (INDIRECT_REF, cst_uchar_node,
+ fold_convert_loc (loc,
+ cst_uchar_ptr_node,
+ arg2)));
+ return fold_build2_loc (loc, MINUS_EXPR, integer_type_node, ind1, ind2);
}
- code = (tree_expr_maybe_nan_p (arg0) || tree_expr_maybe_nan_p (arg1))
- ? unordered_code : ordered_code;
- return fold_build1_loc (loc, TRUTH_NOT_EXPR, type,
- fold_build2_loc (loc, code, type, arg0, arg1));
+ return NULL_TREE;
}
-/* Fold __builtin_{,s,u}{add,sub,mul}{,l,ll}_overflow, either into normal
- arithmetics if it can never overflow, or into internal functions that
- return both result of arithmetics and overflowed boolean flag in
- a complex integer result, or some other check for overflow.
- Similarly fold __builtin_{add,sub,mul}_overflow_p to just the overflow
- checking part of that. */
+/* Fold a call to builtin isascii with argument ARG. */
static tree
-fold_builtin_arith_overflow (location_t loc, enum built_in_function fcode,
- tree arg0, tree arg1, tree arg2)
+fold_builtin_isascii (location_t loc, tree arg)
{
- enum internal_fn ifn = IFN_LAST;
- /* The code of the expression corresponding to the built-in. */
- enum tree_code opcode = ERROR_MARK;
- bool ovf_only = false;
-
- switch (fcode)
+ if (!validate_arg (arg, INTEGER_TYPE))
+ return NULL_TREE;
+ else
{
- case BUILT_IN_ADD_OVERFLOW_P:
- ovf_only = true;
- /* FALLTHRU */
- case BUILT_IN_ADD_OVERFLOW:
- case BUILT_IN_SADD_OVERFLOW:
- case BUILT_IN_SADDL_OVERFLOW:
- case BUILT_IN_SADDLL_OVERFLOW:
- case BUILT_IN_UADD_OVERFLOW:
- case BUILT_IN_UADDL_OVERFLOW:
- case BUILT_IN_UADDLL_OVERFLOW:
- opcode = PLUS_EXPR;
- ifn = IFN_ADD_OVERFLOW;
- break;
- case BUILT_IN_SUB_OVERFLOW_P:
- ovf_only = true;
- /* FALLTHRU */
- case BUILT_IN_SUB_OVERFLOW:
- case BUILT_IN_SSUB_OVERFLOW:
- case BUILT_IN_SSUBL_OVERFLOW:
- case BUILT_IN_SSUBLL_OVERFLOW:
- case BUILT_IN_USUB_OVERFLOW:
- case BUILT_IN_USUBL_OVERFLOW:
- case BUILT_IN_USUBLL_OVERFLOW:
- opcode = MINUS_EXPR;
- ifn = IFN_SUB_OVERFLOW;
- break;
- case BUILT_IN_MUL_OVERFLOW_P:
- ovf_only = true;
- /* FALLTHRU */
- case BUILT_IN_MUL_OVERFLOW:
- case BUILT_IN_SMUL_OVERFLOW:
- case BUILT_IN_SMULL_OVERFLOW:
- case BUILT_IN_SMULLL_OVERFLOW:
- case BUILT_IN_UMUL_OVERFLOW:
- case BUILT_IN_UMULL_OVERFLOW:
- case BUILT_IN_UMULLL_OVERFLOW:
- opcode = MULT_EXPR;
- ifn = IFN_MUL_OVERFLOW;
- break;
- default:
- gcc_unreachable ();
+ /* Transform isascii(c) -> ((c & ~0x7f) == 0). */
+ arg = fold_build2 (BIT_AND_EXPR, integer_type_node, arg,
+ build_int_cst (integer_type_node,
+ ~ (unsigned HOST_WIDE_INT) 0x7f));
+ return fold_build2_loc (loc, EQ_EXPR, integer_type_node,
+ arg, integer_zero_node);
}
+}
- /* For the "generic" overloads, the first two arguments can have different
- types and the last argument determines the target type to use to check
- for overflow. The arguments of the other overloads all have the same
- type. */
- tree type = ovf_only ? TREE_TYPE (arg2) : TREE_TYPE (TREE_TYPE (arg2));
+/* Fold a call to builtin toascii with argument ARG. */
- /* For the __builtin_{add,sub,mul}_overflow_p builtins, when the first two
- arguments are constant, attempt to fold the built-in call into a constant
- expression indicating whether or not it detected an overflow. */
- if (ovf_only
- && TREE_CODE (arg0) == INTEGER_CST
- && TREE_CODE (arg1) == INTEGER_CST)
- /* Perform the computation in the target type and check for overflow. */
- return omit_one_operand_loc (loc, boolean_type_node,
- arith_overflowed_p (opcode, type, arg0, arg1)
- ? boolean_true_node : boolean_false_node,
- arg2);
+static tree
+fold_builtin_toascii (location_t loc, tree arg)
+{
+ if (!validate_arg (arg, INTEGER_TYPE))
+ return NULL_TREE;
- tree intres, ovfres;
- if (TREE_CODE (arg0) == INTEGER_CST && TREE_CODE (arg1) == INTEGER_CST)
- {
- intres = fold_binary_loc (loc, opcode, type,
- fold_convert_loc (loc, type, arg0),
- fold_convert_loc (loc, type, arg1));
- if (TREE_OVERFLOW (intres))
- intres = drop_tree_overflow (intres);
- ovfres = (arith_overflowed_p (opcode, type, arg0, arg1)
- ? boolean_true_node : boolean_false_node);
- }
+ /* Transform toascii(c) -> (c & 0x7f). */
+ return fold_build2_loc (loc, BIT_AND_EXPR, integer_type_node, arg,
+ build_int_cst (integer_type_node, 0x7f));
+}
+
+/* Fold a call to builtin isdigit with argument ARG. */
+
+static tree
+fold_builtin_isdigit (location_t loc, tree arg)
+{
+ if (!validate_arg (arg, INTEGER_TYPE))
+ return NULL_TREE;
else
{
- tree ctype = build_complex_type (type);
- tree call = build_call_expr_internal_loc (loc, ifn, ctype, 2,
- arg0, arg1);
- tree tgt = save_expr (call);
- intres = build1_loc (loc, REALPART_EXPR, type, tgt);
- ovfres = build1_loc (loc, IMAGPART_EXPR, type, tgt);
- ovfres = fold_convert_loc (loc, boolean_type_node, ovfres);
- }
+ /* Transform isdigit(c) -> (unsigned)(c) - '0' <= 9. */
+ /* According to the C standard, isdigit is unaffected by locale.
+ However, it definitely is affected by the target character set. */
+ unsigned HOST_WIDE_INT target_digit0
+ = lang_hooks.to_target_charset ('0');
- if (ovf_only)
- return omit_one_operand_loc (loc, boolean_type_node, ovfres, arg2);
+ if (target_digit0 == 0)
+ return NULL_TREE;
- tree mem_arg2 = build_fold_indirect_ref_loc (loc, arg2);
- tree store
- = fold_build2_loc (loc, MODIFY_EXPR, void_type_node, mem_arg2, intres);
- return build2_loc (loc, COMPOUND_EXPR, boolean_type_node, store, ovfres);
+ arg = fold_convert_loc (loc, unsigned_type_node, arg);
+ arg = fold_build2 (MINUS_EXPR, unsigned_type_node, arg,
+ build_int_cst (unsigned_type_node, target_digit0));
+ return fold_build2_loc (loc, LE_EXPR, integer_type_node, arg,
+ build_int_cst (unsigned_type_node, 9));
+ }
}
-/* Fold a call to __builtin_FILE to a constant string. */
+/* Fold a call to fabs, fabsf or fabsl with argument ARG. */
-static inline tree
-fold_builtin_FILE (location_t loc)
+static tree
+fold_builtin_fabs (location_t loc, tree arg, tree type)
{
- if (const char *fname = LOCATION_FILE (loc))
- {
- /* The documentation says this builtin is equivalent to the preprocessor
- __FILE__ macro so it appears appropriate to use the same file prefix
- mappings. */
- fname = remap_macro_filename (fname);
- return build_string_literal (strlen (fname) + 1, fname);
- }
+ if (!validate_arg (arg, REAL_TYPE))
+ return NULL_TREE;
- return build_string_literal (1, "");
+ arg = fold_convert_loc (loc, type, arg);
+ return fold_build1_loc (loc, ABS_EXPR, type, arg);
}
-/* Fold a call to __builtin_FUNCTION to a constant string. */
+/* Fold a call to abs, labs, llabs or imaxabs with argument ARG. */
-static inline tree
-fold_builtin_FUNCTION ()
+static tree
+fold_builtin_abs (location_t loc, tree arg, tree type)
{
- const char *name = "";
-
- if (current_function_decl)
- name = lang_hooks.decl_printable_name (current_function_decl, 0);
+ if (!validate_arg (arg, INTEGER_TYPE))
+ return NULL_TREE;
- return build_string_literal (strlen (name) + 1, name);
+ arg = fold_convert_loc (loc, type, arg);
+ return fold_build1_loc (loc, ABS_EXPR, type, arg);
}
-/* Fold a call to __builtin_LINE to an integer constant. */
+/* Fold a call to builtin carg(a+bi) -> atan2(b,a). */
-static inline tree
-fold_builtin_LINE (location_t loc, tree type)
+static tree
+fold_builtin_carg (location_t loc, tree arg, tree type)
{
- return build_int_cst (type, LOCATION_LINE (loc));
+ if (validate_arg (arg, COMPLEX_TYPE)
+ && TREE_CODE (TREE_TYPE (TREE_TYPE (arg))) == REAL_TYPE)
+ {
+ tree atan2_fn = mathfn_built_in (type, BUILT_IN_ATAN2);
+
+ if (atan2_fn)
+ {
+ tree new_arg = builtin_save_expr (arg);
+ tree r_arg = fold_build1_loc (loc, REALPART_EXPR, type, new_arg);
+ tree i_arg = fold_build1_loc (loc, IMAGPART_EXPR, type, new_arg);
+ return build_call_expr_loc (loc, atan2_fn, 2, i_arg, r_arg);
+ }
+ }
+
+ return NULL_TREE;
}
-/* Fold a call to built-in function FNDECL with 0 arguments.
- This function returns NULL_TREE if no simplification was possible. */
+/* Fold a call to builtin frexp, we can assume the base is 2. */
static tree
-fold_builtin_0 (location_t loc, tree fndecl)
+fold_builtin_frexp (location_t loc, tree arg0, tree arg1, tree rettype)
{
- tree type = TREE_TYPE (TREE_TYPE (fndecl));
- enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
- switch (fcode)
- {
- case BUILT_IN_FILE:
- return fold_builtin_FILE (loc);
+ if (! validate_arg (arg0, REAL_TYPE) || ! validate_arg (arg1, POINTER_TYPE))
+ return NULL_TREE;
- case BUILT_IN_FUNCTION:
- return fold_builtin_FUNCTION ();
+ STRIP_NOPS (arg0);
- case BUILT_IN_LINE:
- return fold_builtin_LINE (loc, type);
+ if (!(TREE_CODE (arg0) == REAL_CST && ! TREE_OVERFLOW (arg0)))
+ return NULL_TREE;
- CASE_FLT_FN (BUILT_IN_INF):
- CASE_FLT_FN_FLOATN_NX (BUILT_IN_INF):
- case BUILT_IN_INFD32:
- case BUILT_IN_INFD64:
- case BUILT_IN_INFD128:
- return fold_builtin_inf (loc, type, true);
+ arg1 = build_fold_indirect_ref_loc (loc, arg1);
- CASE_FLT_FN (BUILT_IN_HUGE_VAL):
- CASE_FLT_FN_FLOATN_NX (BUILT_IN_HUGE_VAL):
- return fold_builtin_inf (loc, type, false);
+ /* Proceed if a valid pointer type was passed in. */
+ if (TYPE_MAIN_VARIANT (TREE_TYPE (arg1)) == integer_type_node)
+ {
+ const REAL_VALUE_TYPE *const value = TREE_REAL_CST_PTR (arg0);
+ tree frac, exp;
- case BUILT_IN_CLASSIFY_TYPE:
- return fold_builtin_classify_type (NULL_TREE);
+ switch (value->cl)
+ {
+ case rvc_zero:
+ /* For +-0, return (*exp = 0, +-0). */
+ exp = integer_zero_node;
+ frac = arg0;
+ break;
+ case rvc_nan:
+ case rvc_inf:
+ /* For +-NaN or +-Inf, *exp is unspecified, return arg0. */
+ return omit_one_operand_loc (loc, rettype, arg0, arg1);
+ case rvc_normal:
+ {
+ /* Since the frexp function always expects base 2, and in
+ GCC normalized significands are already in the range
+ [0.5, 1.0), we have exactly what frexp wants. */
+ REAL_VALUE_TYPE frac_rvt = *value;
+ SET_REAL_EXP (&frac_rvt, 0);
+ frac = build_real (rettype, frac_rvt);
+ exp = build_int_cst (integer_type_node, REAL_EXP (value));
+ }
+ break;
+ default:
+ gcc_unreachable ();
+ }
- default:
- break;
+ /* Create the COMPOUND_EXPR (*arg1 = trunc, frac). */
+ arg1 = fold_build2_loc (loc, MODIFY_EXPR, rettype, arg1, exp);
+ TREE_SIDE_EFFECTS (arg1) = 1;
+ return fold_build2_loc (loc, COMPOUND_EXPR, rettype, arg1, frac);
}
+
return NULL_TREE;
}
-/* Fold a call to built-in function FNDECL with 1 argument, ARG0.
- This function returns NULL_TREE if no simplification was possible. */
+/* Fold a call to builtin modf. */
static tree
-fold_builtin_1 (location_t loc, tree expr, tree fndecl, tree arg0)
+fold_builtin_modf (location_t loc, tree arg0, tree arg1, tree rettype)
{
- tree type = TREE_TYPE (TREE_TYPE (fndecl));
- enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
+ if (! validate_arg (arg0, REAL_TYPE) || ! validate_arg (arg1, POINTER_TYPE))
+ return NULL_TREE;
- if (TREE_CODE (arg0) == ERROR_MARK)
+ STRIP_NOPS (arg0);
+
+ if (!(TREE_CODE (arg0) == REAL_CST && ! TREE_OVERFLOW (arg0)))
return NULL_TREE;
- if (tree ret = fold_const_call (as_combined_fn (fcode), type, arg0))
- return ret;
+ arg1 = build_fold_indirect_ref_loc (loc, arg1);
- switch (fcode)
+ /* Proceed if a valid pointer type was passed in. */
+ if (TYPE_MAIN_VARIANT (TREE_TYPE (arg1)) == TYPE_MAIN_VARIANT (rettype))
{
- case BUILT_IN_CONSTANT_P:
- {
- tree val = fold_builtin_constant_p (arg0);
-
- /* Gimplification will pull the CALL_EXPR for the builtin out of
- an if condition. When not optimizing, we'll not CSE it back.
- To avoid link error types of regressions, return false now. */
- if (!val && !optimize)
- val = integer_zero_node;
+ const REAL_VALUE_TYPE *const value = TREE_REAL_CST_PTR (arg0);
+ REAL_VALUE_TYPE trunc, frac;
- return val;
+ switch (value->cl)
+ {
+ case rvc_nan:
+ case rvc_zero:
+ /* For +-NaN or +-0, return (*arg1 = arg0, arg0). */
+ trunc = frac = *value;
+ break;
+ case rvc_inf:
+ /* For +-Inf, return (*arg1 = arg0, +-0). */
+ frac = dconst0;
+ frac.sign = value->sign;
+ trunc = *value;
+ break;
+ case rvc_normal:
+ /* Return (*arg1 = trunc(arg0), arg0-trunc(arg0)). */
+ real_trunc (&trunc, VOIDmode, value);
+ real_arithmetic (&frac, MINUS_EXPR, value, &trunc);
+ /* If the original number was negative and already
+ integral, then the fractional part is -0.0. */
+ if (value->sign && frac.cl == rvc_zero)
+ frac.sign = value->sign;
+ break;
}
- case BUILT_IN_CLASSIFY_TYPE:
- return fold_builtin_classify_type (arg0);
-
- case BUILT_IN_STRLEN:
- return fold_builtin_strlen (loc, expr, type, arg0);
+ /* Create the COMPOUND_EXPR (*arg1 = trunc, frac). */
+ arg1 = fold_build2_loc (loc, MODIFY_EXPR, rettype, arg1,
+ build_real (rettype, trunc));
+ TREE_SIDE_EFFECTS (arg1) = 1;
+ return fold_build2_loc (loc, COMPOUND_EXPR, rettype, arg1,
+ build_real (rettype, frac));
+ }
- CASE_FLT_FN (BUILT_IN_FABS):
- CASE_FLT_FN_FLOATN_NX (BUILT_IN_FABS):
- case BUILT_IN_FABSD32:
- case BUILT_IN_FABSD64:
- case BUILT_IN_FABSD128:
- return fold_builtin_fabs (loc, arg0, type);
+ return NULL_TREE;
+}
- case BUILT_IN_ABS:
- case BUILT_IN_LABS:
- case BUILT_IN_LLABS:
- case BUILT_IN_IMAXABS:
- return fold_builtin_abs (loc, arg0, type);
+/* Given a location LOC, an interclass builtin function decl FNDECL
+ and its single argument ARG, return an folded expression computing
+ the same, or NULL_TREE if we either couldn't or didn't want to fold
+ (the latter happen if there's an RTL instruction available). */
- CASE_FLT_FN (BUILT_IN_CONJ):
- if (validate_arg (arg0, COMPLEX_TYPE)
- && TREE_CODE (TREE_TYPE (TREE_TYPE (arg0))) == REAL_TYPE)
- return fold_build1_loc (loc, CONJ_EXPR, type, arg0);
- break;
+static tree
+fold_builtin_interclass_mathfn (location_t loc, tree fndecl, tree arg)
+{
+ machine_mode mode;
- CASE_FLT_FN (BUILT_IN_CREAL):
- if (validate_arg (arg0, COMPLEX_TYPE)
- && TREE_CODE (TREE_TYPE (TREE_TYPE (arg0))) == REAL_TYPE)
- return non_lvalue_loc (loc, fold_build1_loc (loc, REALPART_EXPR, type, arg0));
- break;
+ if (!validate_arg (arg, REAL_TYPE))
+ return NULL_TREE;
- CASE_FLT_FN (BUILT_IN_CIMAG):
- if (validate_arg (arg0, COMPLEX_TYPE)
- && TREE_CODE (TREE_TYPE (TREE_TYPE (arg0))) == REAL_TYPE)
- return non_lvalue_loc (loc, fold_build1_loc (loc, IMAGPART_EXPR, type, arg0));
- break;
+ if (interclass_mathfn_icode (arg, fndecl) != CODE_FOR_nothing)
+ return NULL_TREE;
- CASE_FLT_FN (BUILT_IN_CARG):
- return fold_builtin_carg (loc, arg0, type);
+ mode = TYPE_MODE (TREE_TYPE (arg));
- case BUILT_IN_ISASCII:
- return fold_builtin_isascii (loc, arg0);
+ bool is_ibm_extended = MODE_COMPOSITE_P (mode);
- case BUILT_IN_TOASCII:
- return fold_builtin_toascii (loc, arg0);
+ /* If there is no optab, try generic code. */
+ switch (DECL_FUNCTION_CODE (fndecl))
+ {
+ tree result;
- case BUILT_IN_ISDIGIT:
- return fold_builtin_isdigit (loc, arg0);
+ CASE_FLT_FN (BUILT_IN_ISINF):
+ {
+ /* isinf(x) -> isgreater(fabs(x),DBL_MAX). */
+ tree const isgr_fn = builtin_decl_explicit (BUILT_IN_ISGREATER);
+ tree type = TREE_TYPE (arg);
+ REAL_VALUE_TYPE r;
+ char buf[128];
+ if (is_ibm_extended)
+ {
+ /* NaN and Inf are encoded in the high-order double value
+ only. The low-order value is not significant. */
+ type = double_type_node;
+ mode = DFmode;
+ arg = fold_build1_loc (loc, NOP_EXPR, type, arg);
+ }
+ get_max_float (REAL_MODE_FORMAT (mode), buf, sizeof (buf), false);
+ real_from_string (&r, buf);
+ result = build_call_expr (isgr_fn, 2,
+ fold_build1_loc (loc, ABS_EXPR, type, arg),
+ build_real (type, r));
+ return result;
+ }
CASE_FLT_FN (BUILT_IN_FINITE):
- case BUILT_IN_FINITED32:
- case BUILT_IN_FINITED64:
- case BUILT_IN_FINITED128:
case BUILT_IN_ISFINITE:
{
- tree ret = fold_builtin_classify (loc, fndecl, arg0, BUILT_IN_ISFINITE);
- if (ret)
- return ret;
- return fold_builtin_interclass_mathfn (loc, fndecl, arg0);
- }
+ /* isfinite(x) -> islessequal(fabs(x),DBL_MAX). */
+ tree const isle_fn = builtin_decl_explicit (BUILT_IN_ISLESSEQUAL);
+ tree type = TREE_TYPE (arg);
+ REAL_VALUE_TYPE r;
+ char buf[128];
- CASE_FLT_FN (BUILT_IN_ISINF):
- case BUILT_IN_ISINFD32:
- case BUILT_IN_ISINFD64:
- case BUILT_IN_ISINFD128:
- {
- tree ret = fold_builtin_classify (loc, fndecl, arg0, BUILT_IN_ISINF);
- if (ret)
- return ret;
- return fold_builtin_interclass_mathfn (loc, fndecl, arg0);
+ if (is_ibm_extended)
+ {
+ /* NaN and Inf are encoded in the high-order double value
+ only. The low-order value is not significant. */
+ type = double_type_node;
+ mode = DFmode;
+ arg = fold_build1_loc (loc, NOP_EXPR, type, arg);
+ }
+ get_max_float (REAL_MODE_FORMAT (mode), buf, sizeof (buf), false);
+ real_from_string (&r, buf);
+ result = build_call_expr (isle_fn, 2,
+ fold_build1_loc (loc, ABS_EXPR, type, arg),
+ build_real (type, r));
+ /*result = fold_build2_loc (loc, UNGT_EXPR,
+ TREE_TYPE (TREE_TYPE (fndecl)),
+ fold_build1_loc (loc, ABS_EXPR, type, arg),
+ build_real (type, r));
+ result = fold_build1_loc (loc, TRUTH_NOT_EXPR,
+ TREE_TYPE (TREE_TYPE (fndecl)),
+ result);*/
+ return result;
}
-
case BUILT_IN_ISNORMAL:
- return fold_builtin_interclass_mathfn (loc, fndecl, arg0);
-
- case BUILT_IN_ISINF_SIGN:
- return fold_builtin_classify (loc, fndecl, arg0, BUILT_IN_ISINF_SIGN);
+ {
+ /* isnormal(x) -> isgreaterequal(fabs(x),DBL_MIN) &
+ islessequal(fabs(x),DBL_MAX). */
+ tree const isle_fn = builtin_decl_explicit (BUILT_IN_ISLESSEQUAL);
+ tree type = TREE_TYPE (arg);
+ tree orig_arg, max_exp, min_exp;
+ machine_mode orig_mode = mode;
+ REAL_VALUE_TYPE rmax, rmin;
+ char buf[128];
- CASE_FLT_FN (BUILT_IN_ISNAN):
- case BUILT_IN_ISNAND32:
- case BUILT_IN_ISNAND64:
- case BUILT_IN_ISNAND128:
- return fold_builtin_classify (loc, fndecl, arg0, BUILT_IN_ISNAN);
+ orig_arg = arg = builtin_save_expr (arg);
+ if (is_ibm_extended)
+ {
+ /* Use double to test the normal range of IBM extended
+ precision. Emin for IBM extended precision is
+ different to emin for IEEE double, being 53 higher
+ since the low double exponent is at least 53 lower
+ than the high double exponent. */
+ type = double_type_node;
+ mode = DFmode;
+ arg = fold_build1_loc (loc, NOP_EXPR, type, arg);
+ }
+ arg = fold_build1_loc (loc, ABS_EXPR, type, arg);
- case BUILT_IN_FREE:
- if (integer_zerop (arg0))
- return build_empty_stmt (loc);
- break;
+ get_max_float (REAL_MODE_FORMAT (mode), buf, sizeof (buf), false);
+ real_from_string (&rmax, buf);
+ sprintf (buf, "0x1p%d", REAL_MODE_FORMAT (orig_mode)->emin - 1);
+ real_from_string (&rmin, buf);
+ max_exp = build_real (type, rmax);
+ min_exp = build_real (type, rmin);
+ max_exp = build_call_expr (isle_fn, 2, arg, max_exp);
+ if (is_ibm_extended)
+ {
+ /* Testing the high end of the range is done just using
+ the high double, using the same test as isfinite().
+ For the subnormal end of the range we first test the
+ high double, then if its magnitude is equal to the
+ limit of 0x1p-969, we test whether the low double is
+ non-zero and opposite sign to the high double. */
+ tree const islt_fn = builtin_decl_explicit (BUILT_IN_ISLESS);
+ tree const isgt_fn = builtin_decl_explicit (BUILT_IN_ISGREATER);
+ tree gt_min = build_call_expr (isgt_fn, 2, arg, min_exp);
+ tree eq_min = fold_build2 (EQ_EXPR, integer_type_node,
+ arg, min_exp);
+ tree as_complex = build1 (VIEW_CONVERT_EXPR,
+ complex_double_type_node, orig_arg);
+ tree hi_dbl = build1 (REALPART_EXPR, type, as_complex);
+ tree lo_dbl = build1 (IMAGPART_EXPR, type, as_complex);
+ tree zero = build_real (type, dconst0);
+ tree hilt = build_call_expr (islt_fn, 2, hi_dbl, zero);
+ tree lolt = build_call_expr (islt_fn, 2, lo_dbl, zero);
+ tree logt = build_call_expr (isgt_fn, 2, lo_dbl, zero);
+ tree ok_lo = fold_build1 (TRUTH_NOT_EXPR, integer_type_node,
+ fold_build3 (COND_EXPR,
+ integer_type_node,
+ hilt, logt, lolt));
+ eq_min = fold_build2 (TRUTH_ANDIF_EXPR, integer_type_node,
+ eq_min, ok_lo);
+ min_exp = fold_build2 (TRUTH_ORIF_EXPR, integer_type_node,
+ gt_min, eq_min);
+ }
+ else
+ {
+ tree const isge_fn
+ = builtin_decl_explicit (BUILT_IN_ISGREATEREQUAL);
+ min_exp = build_call_expr (isge_fn, 2, arg, min_exp);
+ }
+ result = fold_build2 (BIT_AND_EXPR, integer_type_node,
+ max_exp, min_exp);
+ return result;
+ }
default:
break;
}
return NULL_TREE;
-
}
-/* Folds a call EXPR (which may be null) to built-in function FNDECL
- with 2 arguments, ARG0 and ARG1. This function returns NULL_TREE
- if no simplification was possible. */
+/* Fold a call to __builtin_isnan(), __builtin_isinf, __builtin_finite.
+ ARG is the argument for the call. */
static tree
-fold_builtin_2 (location_t loc, tree expr, tree fndecl, tree arg0, tree arg1)
+fold_builtin_classify (location_t loc, tree fndecl, tree arg, int builtin_index)
{
tree type = TREE_TYPE (TREE_TYPE (fndecl));
- enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
- if (TREE_CODE (arg0) == ERROR_MARK
- || TREE_CODE (arg1) == ERROR_MARK)
+ if (!validate_arg (arg, REAL_TYPE))
return NULL_TREE;
- if (tree ret = fold_const_call (as_combined_fn (fcode), type, arg0, arg1))
- return ret;
-
- switch (fcode)
+ switch (builtin_index)
{
- CASE_FLT_FN_REENT (BUILT_IN_GAMMA): /* GAMMA_R */
- CASE_FLT_FN_REENT (BUILT_IN_LGAMMA): /* LGAMMA_R */
- if (validate_arg (arg0, REAL_TYPE)
- && validate_arg (arg1, POINTER_TYPE))
- return do_mpfr_lgamma_r (arg0, arg1, type);
- break;
+ case BUILT_IN_ISINF:
+ if (tree_expr_infinite_p (arg))
+ return omit_one_operand_loc (loc, type, integer_one_node, arg);
+ if (!tree_expr_maybe_infinite_p (arg))
+ return omit_one_operand_loc (loc, type, integer_zero_node, arg);
+ return NULL_TREE;
- CASE_FLT_FN (BUILT_IN_FREXP):
- return fold_builtin_frexp (loc, arg0, arg1, type);
+ case BUILT_IN_ISINF_SIGN:
+ {
+ /* isinf_sign(x) -> isinf(x) ? (signbit(x) ? -1 : 1) : 0 */
+ /* In a boolean context, GCC will fold the inner COND_EXPR to
+ 1. So e.g. "if (isinf_sign(x))" would be folded to just
+ "if (isinf(x) ? 1 : 0)" which becomes "if (isinf(x))". */
+ tree signbit_fn = builtin_decl_explicit (BUILT_IN_SIGNBIT);
+ tree isinf_fn = builtin_decl_explicit (BUILT_IN_ISINF);
+ tree tmp = NULL_TREE;
- CASE_FLT_FN (BUILT_IN_MODF):
- return fold_builtin_modf (loc, arg0, arg1, type);
+ arg = builtin_save_expr (arg);
- case BUILT_IN_STRSPN:
- return fold_builtin_strspn (loc, expr, arg0, arg1);
+ if (signbit_fn && isinf_fn)
+ {
+ tree signbit_call = build_call_expr_loc (loc, signbit_fn, 1, arg);
+ tree isinf_call = build_call_expr_loc (loc, isinf_fn, 1, arg);
+
+ signbit_call = fold_build2_loc (loc, NE_EXPR, integer_type_node,
+ signbit_call, integer_zero_node);
+ isinf_call = fold_build2_loc (loc, NE_EXPR, integer_type_node,
+ isinf_call, integer_zero_node);
+
+ tmp = fold_build3_loc (loc, COND_EXPR, integer_type_node, signbit_call,
+ integer_minus_one_node, integer_one_node);
+ tmp = fold_build3_loc (loc, COND_EXPR, integer_type_node,
+ isinf_call, tmp,
+ integer_zero_node);
+ }
+
+ return tmp;
+ }
+
+ case BUILT_IN_ISFINITE:
+ if (tree_expr_finite_p (arg))
+ return omit_one_operand_loc (loc, type, integer_one_node, arg);
+ if (tree_expr_nan_p (arg) || tree_expr_infinite_p (arg))
+ return omit_one_operand_loc (loc, type, integer_zero_node, arg);
+ return NULL_TREE;
+
+ case BUILT_IN_ISNAN:
+ if (tree_expr_nan_p (arg))
+ return omit_one_operand_loc (loc, type, integer_one_node, arg);
+ if (!tree_expr_maybe_nan_p (arg))
+ return omit_one_operand_loc (loc, type, integer_zero_node, arg);
+
+ {
+ bool is_ibm_extended = MODE_COMPOSITE_P (TYPE_MODE (TREE_TYPE (arg)));
+ if (is_ibm_extended)
+ {
+ /* NaN and Inf are encoded in the high-order double value
+ only. The low-order value is not significant. */
+ arg = fold_build1_loc (loc, NOP_EXPR, double_type_node, arg);
+ }
+ }
+ arg = builtin_save_expr (arg);
+ return fold_build2_loc (loc, UNORDERED_EXPR, type, arg, arg);
+
+ default:
+ gcc_unreachable ();
+ }
+}
- case BUILT_IN_STRCSPN:
- return fold_builtin_strcspn (loc, expr, arg0, arg1);
+/* Fold a call to __builtin_fpclassify(int, int, int, int, int, ...).
+ This builtin will generate code to return the appropriate floating
+ point classification depending on the value of the floating point
+ number passed in. The possible return values must be supplied as
+ int arguments to the call in the following order: FP_NAN, FP_INFINITE,
+ FP_NORMAL, FP_SUBNORMAL and FP_ZERO. The ellipses is for exactly
+ one floating point argument which is "type generic". */
- case BUILT_IN_STRPBRK:
- return fold_builtin_strpbrk (loc, expr, arg0, arg1, type);
+static tree
+fold_builtin_fpclassify (location_t loc, tree *args, int nargs)
+{
+ tree fp_nan, fp_infinite, fp_normal, fp_subnormal, fp_zero,
+ arg, type, res, tmp;
+ machine_mode mode;
+ REAL_VALUE_TYPE r;
+ char buf[128];
- case BUILT_IN_EXPECT:
- return fold_builtin_expect (loc, arg0, arg1, NULL_TREE, NULL_TREE);
+ /* Verify the required arguments in the original call. */
+ if (nargs != 6
+ || !validate_arg (args[0], INTEGER_TYPE)
+ || !validate_arg (args[1], INTEGER_TYPE)
+ || !validate_arg (args[2], INTEGER_TYPE)
+ || !validate_arg (args[3], INTEGER_TYPE)
+ || !validate_arg (args[4], INTEGER_TYPE)
+ || !validate_arg (args[5], REAL_TYPE))
+ return NULL_TREE;
- case BUILT_IN_ISGREATER:
- return fold_builtin_unordered_cmp (loc, fndecl,
- arg0, arg1, UNLE_EXPR, LE_EXPR);
- case BUILT_IN_ISGREATEREQUAL:
- return fold_builtin_unordered_cmp (loc, fndecl,
- arg0, arg1, UNLT_EXPR, LT_EXPR);
- case BUILT_IN_ISLESS:
- return fold_builtin_unordered_cmp (loc, fndecl,
- arg0, arg1, UNGE_EXPR, GE_EXPR);
- case BUILT_IN_ISLESSEQUAL:
- return fold_builtin_unordered_cmp (loc, fndecl,
- arg0, arg1, UNGT_EXPR, GT_EXPR);
- case BUILT_IN_ISLESSGREATER:
- return fold_builtin_unordered_cmp (loc, fndecl,
- arg0, arg1, UNEQ_EXPR, EQ_EXPR);
- case BUILT_IN_ISUNORDERED:
- return fold_builtin_unordered_cmp (loc, fndecl,
- arg0, arg1, UNORDERED_EXPR,
- NOP_EXPR);
+ fp_nan = args[0];
+ fp_infinite = args[1];
+ fp_normal = args[2];
+ fp_subnormal = args[3];
+ fp_zero = args[4];
+ arg = args[5];
+ type = TREE_TYPE (arg);
+ mode = TYPE_MODE (type);
+ arg = builtin_save_expr (fold_build1_loc (loc, ABS_EXPR, type, arg));
- /* We do the folding for va_start in the expander. */
- case BUILT_IN_VA_START:
- break;
+ /* fpclassify(x) ->
+ isnan(x) ? FP_NAN :
+ (fabs(x) == Inf ? FP_INFINITE :
+ (fabs(x) >= DBL_MIN ? FP_NORMAL :
+ (x == 0 ? FP_ZERO : FP_SUBNORMAL))). */
- case BUILT_IN_OBJECT_SIZE:
- return fold_builtin_object_size (arg0, arg1);
+ tmp = fold_build2_loc (loc, EQ_EXPR, integer_type_node, arg,
+ build_real (type, dconst0));
+ res = fold_build3_loc (loc, COND_EXPR, integer_type_node,
+ tmp, fp_zero, fp_subnormal);
- case BUILT_IN_ATOMIC_ALWAYS_LOCK_FREE:
- return fold_builtin_atomic_always_lock_free (arg0, arg1);
+ sprintf (buf, "0x1p%d", REAL_MODE_FORMAT (mode)->emin - 1);
+ real_from_string (&r, buf);
+ tmp = fold_build2_loc (loc, GE_EXPR, integer_type_node,
+ arg, build_real (type, r));
+ res = fold_build3_loc (loc, COND_EXPR, integer_type_node, tmp, fp_normal, res);
- case BUILT_IN_ATOMIC_IS_LOCK_FREE:
- return fold_builtin_atomic_is_lock_free (arg0, arg1);
+ if (tree_expr_maybe_infinite_p (arg))
+ {
+ real_inf (&r);
+ tmp = fold_build2_loc (loc, EQ_EXPR, integer_type_node, arg,
+ build_real (type, r));
+ res = fold_build3_loc (loc, COND_EXPR, integer_type_node, tmp,
+ fp_infinite, res);
+ }
- default:
- break;
+ if (tree_expr_maybe_nan_p (arg))
+ {
+ tmp = fold_build2_loc (loc, ORDERED_EXPR, integer_type_node, arg, arg);
+ res = fold_build3_loc (loc, COND_EXPR, integer_type_node, tmp, res, fp_nan);
}
- return NULL_TREE;
+
+ return res;
}
-/* Fold a call to built-in function FNDECL with 3 arguments, ARG0, ARG1,
- and ARG2.
- This function returns NULL_TREE if no simplification was possible. */
+/* Fold a call to an unordered comparison function such as
+ __builtin_isgreater(). FNDECL is the FUNCTION_DECL for the function
+ being called and ARG0 and ARG1 are the arguments for the call.
+ UNORDERED_CODE and ORDERED_CODE are comparison codes that give
+ the opposite of the desired result. UNORDERED_CODE is used
+ for modes that can hold NaNs and ORDERED_CODE is used for
+ the rest. */
static tree
-fold_builtin_3 (location_t loc, tree fndecl,
- tree arg0, tree arg1, tree arg2)
+fold_builtin_unordered_cmp (location_t loc, tree fndecl, tree arg0, tree arg1,
+ enum tree_code unordered_code,
+ enum tree_code ordered_code)
{
tree type = TREE_TYPE (TREE_TYPE (fndecl));
- enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
+ enum tree_code code;
+ tree type0, type1;
+ enum tree_code code0, code1;
+ tree cmp_type = NULL_TREE;
- if (TREE_CODE (arg0) == ERROR_MARK
- || TREE_CODE (arg1) == ERROR_MARK
- || TREE_CODE (arg2) == ERROR_MARK)
- return NULL_TREE;
+ type0 = TREE_TYPE (arg0);
+ type1 = TREE_TYPE (arg1);
- if (tree ret = fold_const_call (as_combined_fn (fcode), type,
- arg0, arg1, arg2))
- return ret;
+ code0 = TREE_CODE (type0);
+ code1 = TREE_CODE (type1);
- switch (fcode)
- {
+ if (code0 == REAL_TYPE && code1 == REAL_TYPE)
+ /* Choose the wider of two real types. */
+ cmp_type = TYPE_PRECISION (type0) >= TYPE_PRECISION (type1)
+ ? type0 : type1;
+ else if (code0 == REAL_TYPE && code1 == INTEGER_TYPE)
+ cmp_type = type0;
+ else if (code0 == INTEGER_TYPE && code1 == REAL_TYPE)
+ cmp_type = type1;
- CASE_FLT_FN (BUILT_IN_SINCOS):
- return fold_builtin_sincos (loc, arg0, arg1, arg2);
+ arg0 = fold_convert_loc (loc, cmp_type, arg0);
+ arg1 = fold_convert_loc (loc, cmp_type, arg1);
- CASE_FLT_FN (BUILT_IN_REMQUO):
- if (validate_arg (arg0, REAL_TYPE)
- && validate_arg (arg1, REAL_TYPE)
- && validate_arg (arg2, POINTER_TYPE))
- return do_mpfr_remquo (arg0, arg1, arg2);
- break;
+ if (unordered_code == UNORDERED_EXPR)
+ {
+ if (tree_expr_nan_p (arg0) || tree_expr_nan_p (arg1))
+ return omit_two_operands_loc (loc, type, integer_one_node, arg0, arg1);
+ if (!tree_expr_maybe_nan_p (arg0) && !tree_expr_maybe_nan_p (arg1))
+ return omit_two_operands_loc (loc, type, integer_zero_node, arg0, arg1);
+ return fold_build2_loc (loc, UNORDERED_EXPR, type, arg0, arg1);
+ }
- case BUILT_IN_MEMCMP:
- return fold_builtin_memcmp (loc, arg0, arg1, arg2);
+ code = (tree_expr_maybe_nan_p (arg0) || tree_expr_maybe_nan_p (arg1))
+ ? unordered_code : ordered_code;
+ return fold_build1_loc (loc, TRUTH_NOT_EXPR, type,
+ fold_build2_loc (loc, code, type, arg0, arg1));
+}
- case BUILT_IN_EXPECT:
- return fold_builtin_expect (loc, arg0, arg1, arg2, NULL_TREE);
+/* Fold __builtin_{,s,u}{add,sub,mul}{,l,ll}_overflow, either into normal
+ arithmetics if it can never overflow, or into internal functions that
+ return both result of arithmetics and overflowed boolean flag in
+ a complex integer result, or some other check for overflow.
+ Similarly fold __builtin_{add,sub,mul}_overflow_p to just the overflow
+ checking part of that. */
- case BUILT_IN_EXPECT_WITH_PROBABILITY:
- return fold_builtin_expect (loc, arg0, arg1, NULL_TREE, arg2);
+static tree
+fold_builtin_arith_overflow (location_t loc, enum built_in_function fcode,
+ tree arg0, tree arg1, tree arg2)
+{
+ enum internal_fn ifn = IFN_LAST;
+ /* The code of the expression corresponding to the built-in. */
+ enum tree_code opcode = ERROR_MARK;
+ bool ovf_only = false;
- case BUILT_IN_ADD_OVERFLOW:
- case BUILT_IN_SUB_OVERFLOW:
- case BUILT_IN_MUL_OVERFLOW:
+ switch (fcode)
+ {
case BUILT_IN_ADD_OVERFLOW_P:
- case BUILT_IN_SUB_OVERFLOW_P:
- case BUILT_IN_MUL_OVERFLOW_P:
+ ovf_only = true;
+ /* FALLTHRU */
+ case BUILT_IN_ADD_OVERFLOW:
case BUILT_IN_SADD_OVERFLOW:
case BUILT_IN_SADDL_OVERFLOW:
case BUILT_IN_SADDLL_OVERFLOW:
- case BUILT_IN_SSUB_OVERFLOW:
- case BUILT_IN_SSUBL_OVERFLOW:
- case BUILT_IN_SSUBLL_OVERFLOW:
- case BUILT_IN_SMUL_OVERFLOW:
- case BUILT_IN_SMULL_OVERFLOW:
- case BUILT_IN_SMULLL_OVERFLOW:
case BUILT_IN_UADD_OVERFLOW:
case BUILT_IN_UADDL_OVERFLOW:
case BUILT_IN_UADDLL_OVERFLOW:
+ opcode = PLUS_EXPR;
+ ifn = IFN_ADD_OVERFLOW;
+ break;
+ case BUILT_IN_SUB_OVERFLOW_P:
+ ovf_only = true;
+ /* FALLTHRU */
+ case BUILT_IN_SUB_OVERFLOW:
+ case BUILT_IN_SSUB_OVERFLOW:
+ case BUILT_IN_SSUBL_OVERFLOW:
+ case BUILT_IN_SSUBLL_OVERFLOW:
case BUILT_IN_USUB_OVERFLOW:
case BUILT_IN_USUBL_OVERFLOW:
case BUILT_IN_USUBLL_OVERFLOW:
+ opcode = MINUS_EXPR;
+ ifn = IFN_SUB_OVERFLOW;
+ break;
+ case BUILT_IN_MUL_OVERFLOW_P:
+ ovf_only = true;
+ /* FALLTHRU */
+ case BUILT_IN_MUL_OVERFLOW:
+ case BUILT_IN_SMUL_OVERFLOW:
+ case BUILT_IN_SMULL_OVERFLOW:
+ case BUILT_IN_SMULLL_OVERFLOW:
case BUILT_IN_UMUL_OVERFLOW:
case BUILT_IN_UMULL_OVERFLOW:
case BUILT_IN_UMULLL_OVERFLOW:
- return fold_builtin_arith_overflow (loc, fcode, arg0, arg1, arg2);
-
- default:
+ opcode = MULT_EXPR;
+ ifn = IFN_MUL_OVERFLOW;
break;
+ default:
+ gcc_unreachable ();
+ }
+
+ /* For the "generic" overloads, the first two arguments can have different
+ types and the last argument determines the target type to use to check
+ for overflow. The arguments of the other overloads all have the same
+ type. */
+ tree type = ovf_only ? TREE_TYPE (arg2) : TREE_TYPE (TREE_TYPE (arg2));
+
+ /* For the __builtin_{add,sub,mul}_overflow_p builtins, when the first two
+ arguments are constant, attempt to fold the built-in call into a constant
+ expression indicating whether or not it detected an overflow. */
+ if (ovf_only
+ && TREE_CODE (arg0) == INTEGER_CST
+ && TREE_CODE (arg1) == INTEGER_CST)
+ /* Perform the computation in the target type and check for overflow. */
+ return omit_one_operand_loc (loc, boolean_type_node,
+ arith_overflowed_p (opcode, type, arg0, arg1)
+ ? boolean_true_node : boolean_false_node,
+ arg2);
+
+ tree intres, ovfres;
+ if (TREE_CODE (arg0) == INTEGER_CST && TREE_CODE (arg1) == INTEGER_CST)
+ {
+ intres = fold_binary_loc (loc, opcode, type,
+ fold_convert_loc (loc, type, arg0),
+ fold_convert_loc (loc, type, arg1));
+ if (TREE_OVERFLOW (intres))
+ intres = drop_tree_overflow (intres);
+ ovfres = (arith_overflowed_p (opcode, type, arg0, arg1)
+ ? boolean_true_node : boolean_false_node);
}
- return NULL_TREE;
+ else
+ {
+ tree ctype = build_complex_type (type);
+ tree call = build_call_expr_internal_loc (loc, ifn, ctype, 2,
+ arg0, arg1);
+ tree tgt = save_expr (call);
+ intres = build1_loc (loc, REALPART_EXPR, type, tgt);
+ ovfres = build1_loc (loc, IMAGPART_EXPR, type, tgt);
+ ovfres = fold_convert_loc (loc, boolean_type_node, ovfres);
+ }
+
+ if (ovf_only)
+ return omit_one_operand_loc (loc, boolean_type_node, ovfres, arg2);
+
+ tree mem_arg2 = build_fold_indirect_ref_loc (loc, arg2);
+ tree store
+ = fold_build2_loc (loc, MODIFY_EXPR, void_type_node, mem_arg2, intres);
+ return build2_loc (loc, COMPOUND_EXPR, boolean_type_node, store, ovfres);
}
-/* Folds a call EXPR (which may be null) to built-in function FNDECL.
- ARGS is an array of NARGS arguments. IGNORE is true if the result
- of the function call is ignored. This function returns NULL_TREE
- if no simplification was possible. */
+/* Fold a call to __builtin_FILE to a constant string. */
-static tree
-fold_builtin_n (location_t loc, tree expr, tree fndecl, tree *args,
- int nargs, bool)
+static inline tree
+fold_builtin_FILE (location_t loc)
{
- tree ret = NULL_TREE;
-
- switch (nargs)
- {
- case 0:
- ret = fold_builtin_0 (loc, fndecl);
- break;
- case 1:
- ret = fold_builtin_1 (loc, expr, fndecl, args[0]);
- break;
- case 2:
- ret = fold_builtin_2 (loc, expr, fndecl, args[0], args[1]);
- break;
- case 3:
- ret = fold_builtin_3 (loc, fndecl, args[0], args[1], args[2]);
- break;
- default:
- ret = fold_builtin_varargs (loc, fndecl, args, nargs);
- break;
- }
- if (ret)
+ if (const char *fname = LOCATION_FILE (loc))
{
- ret = build1 (NOP_EXPR, TREE_TYPE (ret), ret);
- SET_EXPR_LOCATION (ret, loc);
- return ret;
+ /* The documentation says this builtin is equivalent to the preprocessor
+ __FILE__ macro so it appears appropriate to use the same file prefix
+ mappings. */
+ fname = remap_macro_filename (fname);
+ return build_string_literal (strlen (fname) + 1, fname);
}
- return NULL_TREE;
+
+ return build_string_literal (1, "");
}
-/* Construct a new CALL_EXPR to FNDECL using the tail of the argument
- list ARGS along with N new arguments in NEWARGS. SKIP is the number
- of arguments in ARGS to be omitted. OLDNARGS is the number of
- elements in ARGS. */
+/* Fold a call to __builtin_FUNCTION to a constant string. */
-static tree
-rewrite_call_expr_valist (location_t loc, int oldnargs, tree *args,
- int skip, tree fndecl, int n, va_list newargs)
+static inline tree
+fold_builtin_FUNCTION ()
{
- int nargs = oldnargs - skip + n;
- tree *buffer;
-
- if (n > 0)
- {
- int i, j;
+ const char *name = "";
- buffer = XALLOCAVEC (tree, nargs);
- for (i = 0; i < n; i++)
- buffer[i] = va_arg (newargs, tree);
- for (j = skip; j < oldnargs; j++, i++)
- buffer[i] = args[j];
- }
- else
- buffer = args + skip;
+ if (current_function_decl)
+ name = lang_hooks.decl_printable_name (current_function_decl, 0);
- return build_call_expr_loc_array (loc, fndecl, nargs, buffer);
+ return build_string_literal (strlen (name) + 1, name);
}
-/* Return true if FNDECL shouldn't be folded right now.
- If a built-in function has an inline attribute always_inline
- wrapper, defer folding it after always_inline functions have
- been inlined, otherwise e.g. -D_FORTIFY_SOURCE checking
- might not be performed. */
+/* Fold a call to __builtin_LINE to an integer constant. */
-bool
-avoid_folding_inline_builtin (tree fndecl)
+static inline tree
+fold_builtin_LINE (location_t loc, tree type)
{
- return (DECL_DECLARED_INLINE_P (fndecl)
- && DECL_DISREGARD_INLINE_LIMITS (fndecl)
- && cfun
- && !cfun->always_inline_functions_inlined
- && lookup_attribute ("always_inline", DECL_ATTRIBUTES (fndecl)));
+ return build_int_cst (type, LOCATION_LINE (loc));
}
-/* A wrapper function for builtin folding that prevents warnings for
- "statement without effect" and the like, caused by removing the
- call node earlier than the warning is generated. */
+/* Fold a call to built-in function FNDECL with 0 arguments.
+ This function returns NULL_TREE if no simplification was possible. */
-tree
-fold_call_expr (location_t loc, tree exp, bool ignore)
+static tree
+fold_builtin_0 (location_t loc, tree fndecl)
{
- tree ret = NULL_TREE;
- tree fndecl = get_callee_fndecl (exp);
- if (fndecl && fndecl_built_in_p (fndecl)
- /* If CALL_EXPR_VA_ARG_PACK is set, the arguments aren't finalized
- yet. Defer folding until we see all the arguments
- (after inlining). */
- && !CALL_EXPR_VA_ARG_PACK (exp))
+ tree type = TREE_TYPE (TREE_TYPE (fndecl));
+ enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
+ switch (fcode)
{
- int nargs = call_expr_nargs (exp);
+ case BUILT_IN_FILE:
+ return fold_builtin_FILE (loc);
- /* Before gimplification CALL_EXPR_VA_ARG_PACK is not set, but
- instead last argument is __builtin_va_arg_pack (). Defer folding
- even in that case, until arguments are finalized. */
- if (nargs && TREE_CODE (CALL_EXPR_ARG (exp, nargs - 1)) == CALL_EXPR)
- {
- tree fndecl2 = get_callee_fndecl (CALL_EXPR_ARG (exp, nargs - 1));
- if (fndecl2 && fndecl_built_in_p (fndecl2, BUILT_IN_VA_ARG_PACK))
- return NULL_TREE;
- }
+ case BUILT_IN_FUNCTION:
+ return fold_builtin_FUNCTION ();
- if (avoid_folding_inline_builtin (fndecl))
- return NULL_TREE;
+ case BUILT_IN_LINE:
+ return fold_builtin_LINE (loc, type);
- if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
- return targetm.fold_builtin (fndecl, call_expr_nargs (exp),
- CALL_EXPR_ARGP (exp), ignore);
- else
- {
- tree *args = CALL_EXPR_ARGP (exp);
- ret = fold_builtin_n (loc, exp, fndecl, args, nargs, ignore);
- if (ret)
- return ret;
- }
- }
- return NULL_TREE;
-}
+ CASE_FLT_FN (BUILT_IN_INF):
+ CASE_FLT_FN_FLOATN_NX (BUILT_IN_INF):
+ case BUILT_IN_INFD32:
+ case BUILT_IN_INFD64:
+ case BUILT_IN_INFD128:
+ return fold_builtin_inf (loc, type, true);
-/* Fold a CALL_EXPR with type TYPE with FN as the function expression.
- N arguments are passed in the array ARGARRAY. Return a folded
- expression or NULL_TREE if no simplification was possible. */
+ CASE_FLT_FN (BUILT_IN_HUGE_VAL):
+ CASE_FLT_FN_FLOATN_NX (BUILT_IN_HUGE_VAL):
+ return fold_builtin_inf (loc, type, false);
-tree
-fold_builtin_call_array (location_t loc, tree,
- tree fn,
- int n,
- tree *argarray)
-{
- if (TREE_CODE (fn) != ADDR_EXPR)
- return NULL_TREE;
+ case BUILT_IN_CLASSIFY_TYPE:
+ return fold_builtin_classify_type (NULL_TREE);
- tree fndecl = TREE_OPERAND (fn, 0);
- if (TREE_CODE (fndecl) == FUNCTION_DECL
- && fndecl_built_in_p (fndecl))
- {
- /* If last argument is __builtin_va_arg_pack (), arguments to this
- function are not finalized yet. Defer folding until they are. */
- if (n && TREE_CODE (argarray[n - 1]) == CALL_EXPR)
- {
- tree fndecl2 = get_callee_fndecl (argarray[n - 1]);
- if (fndecl2 && fndecl_built_in_p (fndecl2, BUILT_IN_VA_ARG_PACK))
- return NULL_TREE;
- }
- if (avoid_folding_inline_builtin (fndecl))
- return NULL_TREE;
- if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
- return targetm.fold_builtin (fndecl, n, argarray, false);
- else
- return fold_builtin_n (loc, NULL_TREE, fndecl, argarray, n, false);
+ default:
+ break;
}
-
return NULL_TREE;
}
-/* Construct a new CALL_EXPR using the tail of the argument list of EXP
- along with N new arguments specified as the "..." parameters. SKIP
- is the number of arguments in EXP to be omitted. This function is used
- to do varargs-to-varargs transformations. */
+/* Fold a call to built-in function FNDECL with 1 argument, ARG0.
+ This function returns NULL_TREE if no simplification was possible. */
static tree
-rewrite_call_expr (location_t loc, tree exp, int skip, tree fndecl, int n, ...)
+fold_builtin_1 (location_t loc, tree expr, tree fndecl, tree arg0)
{
- va_list ap;
- tree t;
+ tree type = TREE_TYPE (TREE_TYPE (fndecl));
+ enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
- va_start (ap, n);
- t = rewrite_call_expr_valist (loc, call_expr_nargs (exp),
- CALL_EXPR_ARGP (exp), skip, fndecl, n, ap);
- va_end (ap);
+ if (TREE_CODE (arg0) == ERROR_MARK)
+ return NULL_TREE;
- return t;
-}
+ if (tree ret = fold_const_call (as_combined_fn (fcode), type, arg0))
+ return ret;
-/* Validate a single argument ARG against a tree code CODE representing
- a type. Return true when argument is valid. */
+ switch (fcode)
+ {
+ case BUILT_IN_CONSTANT_P:
+ {
+ tree val = fold_builtin_constant_p (arg0);
-static bool
-validate_arg (const_tree arg, enum tree_code code)
-{
- if (!arg)
- return false;
- else if (code == POINTER_TYPE)
- return POINTER_TYPE_P (TREE_TYPE (arg));
- else if (code == INTEGER_TYPE)
- return INTEGRAL_TYPE_P (TREE_TYPE (arg));
- return code == TREE_CODE (TREE_TYPE (arg));
-}
+ /* Gimplification will pull the CALL_EXPR for the builtin out of
+ an if condition. When not optimizing, we'll not CSE it back.
+ To avoid link error types of regressions, return false now. */
+ if (!val && !optimize)
+ val = integer_zero_node;
+
+ return val;
+ }
+
+ case BUILT_IN_CLASSIFY_TYPE:
+ return fold_builtin_classify_type (arg0);
+
+ case BUILT_IN_STRLEN:
+ return fold_builtin_strlen (loc, expr, type, arg0);
+
+ CASE_FLT_FN (BUILT_IN_FABS):
+ CASE_FLT_FN_FLOATN_NX (BUILT_IN_FABS):
+ case BUILT_IN_FABSD32:
+ case BUILT_IN_FABSD64:
+ case BUILT_IN_FABSD128:
+ return fold_builtin_fabs (loc, arg0, type);
-/* This function validates the types of a function call argument list
- against a specified list of tree_codes. If the last specifier is a 0,
- that represents an ellipses, otherwise the last specifier must be a
- VOID_TYPE.
+ case BUILT_IN_ABS:
+ case BUILT_IN_LABS:
+ case BUILT_IN_LLABS:
+ case BUILT_IN_IMAXABS:
+ return fold_builtin_abs (loc, arg0, type);
- This is the GIMPLE version of validate_arglist. Eventually we want to
- completely convert builtins.c to work from GIMPLEs and the tree based
- validate_arglist will then be removed. */
+ CASE_FLT_FN (BUILT_IN_CONJ):
+ if (validate_arg (arg0, COMPLEX_TYPE)
+ && TREE_CODE (TREE_TYPE (TREE_TYPE (arg0))) == REAL_TYPE)
+ return fold_build1_loc (loc, CONJ_EXPR, type, arg0);
+ break;
-bool
-validate_gimple_arglist (const gcall *call, ...)
-{
- enum tree_code code;
- bool res = 0;
- va_list ap;
- const_tree arg;
- size_t i;
+ CASE_FLT_FN (BUILT_IN_CREAL):
+ if (validate_arg (arg0, COMPLEX_TYPE)
+ && TREE_CODE (TREE_TYPE (TREE_TYPE (arg0))) == REAL_TYPE)
+ return non_lvalue_loc (loc, fold_build1_loc (loc, REALPART_EXPR, type, arg0));
+ break;
- va_start (ap, call);
- i = 0;
+ CASE_FLT_FN (BUILT_IN_CIMAG):
+ if (validate_arg (arg0, COMPLEX_TYPE)
+ && TREE_CODE (TREE_TYPE (TREE_TYPE (arg0))) == REAL_TYPE)
+ return non_lvalue_loc (loc, fold_build1_loc (loc, IMAGPART_EXPR, type, arg0));
+ break;
- do
- {
- code = (enum tree_code) va_arg (ap, int);
- switch (code)
- {
- case 0:
- /* This signifies an ellipses, any further arguments are all ok. */
- res = true;
- goto end;
- case VOID_TYPE:
- /* This signifies an endlink, if no arguments remain, return
- true, otherwise return false. */
- res = (i == gimple_call_num_args (call));
- goto end;
- default:
- /* If no parameters remain or the parameter's code does not
- match the specified code, return false. Otherwise continue
- checking any remaining arguments. */
- arg = gimple_call_arg (call, i++);
- if (!validate_arg (arg, code))
- goto end;
- break;
- }
- }
- while (1);
+ CASE_FLT_FN (BUILT_IN_CARG):
+ return fold_builtin_carg (loc, arg0, type);
- /* We need gotos here since we can only have one VA_CLOSE in a
- function. */
- end: ;
- va_end (ap);
+ case BUILT_IN_ISASCII:
+ return fold_builtin_isascii (loc, arg0);
- return res;
-}
+ case BUILT_IN_TOASCII:
+ return fold_builtin_toascii (loc, arg0);
-/* Default target-specific builtin expander that does nothing. */
+ case BUILT_IN_ISDIGIT:
+ return fold_builtin_isdigit (loc, arg0);
-rtx
-default_expand_builtin (tree exp ATTRIBUTE_UNUSED,
- rtx target ATTRIBUTE_UNUSED,
- rtx subtarget ATTRIBUTE_UNUSED,
- machine_mode mode ATTRIBUTE_UNUSED,
- int ignore ATTRIBUTE_UNUSED)
-{
- return NULL_RTX;
-}
+ CASE_FLT_FN (BUILT_IN_FINITE):
+ case BUILT_IN_FINITED32:
+ case BUILT_IN_FINITED64:
+ case BUILT_IN_FINITED128:
+ case BUILT_IN_ISFINITE:
+ {
+ tree ret = fold_builtin_classify (loc, fndecl, arg0, BUILT_IN_ISFINITE);
+ if (ret)
+ return ret;
+ return fold_builtin_interclass_mathfn (loc, fndecl, arg0);
+ }
-/* Returns true is EXP represents data that would potentially reside
- in a readonly section. */
+ CASE_FLT_FN (BUILT_IN_ISINF):
+ case BUILT_IN_ISINFD32:
+ case BUILT_IN_ISINFD64:
+ case BUILT_IN_ISINFD128:
+ {
+ tree ret = fold_builtin_classify (loc, fndecl, arg0, BUILT_IN_ISINF);
+ if (ret)
+ return ret;
+ return fold_builtin_interclass_mathfn (loc, fndecl, arg0);
+ }
-bool
-readonly_data_expr (tree exp)
-{
- STRIP_NOPS (exp);
+ case BUILT_IN_ISNORMAL:
+ return fold_builtin_interclass_mathfn (loc, fndecl, arg0);
- if (TREE_CODE (exp) != ADDR_EXPR)
- return false;
+ case BUILT_IN_ISINF_SIGN:
+ return fold_builtin_classify (loc, fndecl, arg0, BUILT_IN_ISINF_SIGN);
- exp = get_base_address (TREE_OPERAND (exp, 0));
- if (!exp)
- return false;
+ CASE_FLT_FN (BUILT_IN_ISNAN):
+ case BUILT_IN_ISNAND32:
+ case BUILT_IN_ISNAND64:
+ case BUILT_IN_ISNAND128:
+ return fold_builtin_classify (loc, fndecl, arg0, BUILT_IN_ISNAN);
- /* Make sure we call decl_readonly_section only for trees it
- can handle (since it returns true for everything it doesn't
- understand). */
- if (TREE_CODE (exp) == STRING_CST
- || TREE_CODE (exp) == CONSTRUCTOR
- || (VAR_P (exp) && TREE_STATIC (exp)))
- return decl_readonly_section (exp, 0);
- else
- return false;
-}
+ case BUILT_IN_FREE:
+ if (integer_zerop (arg0))
+ return build_empty_stmt (loc);
+ break;
-/* Simplify a call to the strpbrk builtin. S1 and S2 are the arguments
- to the call, and TYPE is its return type.
+ default:
+ break;
+ }
- Return NULL_TREE if no simplification was possible, otherwise return the
- simplified form of the call as a tree.
+ return NULL_TREE;
- The simplified form may be a constant or other expression which
- computes the same value, but in a more efficient manner (including
- calls to other builtin functions).
+}
- The call may contain arguments which need to be evaluated, but
- which are not useful to determine the result of the call. In
- this case we return a chain of COMPOUND_EXPRs. The LHS of each
- COMPOUND_EXPR will be an argument which must be evaluated.
- COMPOUND_EXPRs are chained through their RHS. The RHS of the last
- COMPOUND_EXPR in the chain will contain the tree for the simplified
- form of the builtin function call. */
+/* Folds a call EXPR (which may be null) to built-in function FNDECL
+ with 2 arguments, ARG0 and ARG1. This function returns NULL_TREE
+ if no simplification was possible. */
static tree
-fold_builtin_strpbrk (location_t loc, tree, tree s1, tree s2, tree type)
+fold_builtin_2 (location_t loc, tree expr, tree fndecl, tree arg0, tree arg1)
{
- if (!validate_arg (s1, POINTER_TYPE)
- || !validate_arg (s2, POINTER_TYPE))
- return NULL_TREE;
-
- tree fn;
- const char *p1, *p2;
+ tree type = TREE_TYPE (TREE_TYPE (fndecl));
+ enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
- p2 = c_getstr (s2);
- if (p2 == NULL)
+ if (TREE_CODE (arg0) == ERROR_MARK
+ || TREE_CODE (arg1) == ERROR_MARK)
return NULL_TREE;
- p1 = c_getstr (s1);
- if (p1 != NULL)
+ if (tree ret = fold_const_call (as_combined_fn (fcode), type, arg0, arg1))
+ return ret;
+
+ switch (fcode)
{
- const char *r = strpbrk (p1, p2);
- tree tem;
+ CASE_FLT_FN_REENT (BUILT_IN_GAMMA): /* GAMMA_R */
+ CASE_FLT_FN_REENT (BUILT_IN_LGAMMA): /* LGAMMA_R */
+ if (validate_arg (arg0, REAL_TYPE)
+ && validate_arg (arg1, POINTER_TYPE))
+ return do_mpfr_lgamma_r (arg0, arg1, type);
+ break;
- if (r == NULL)
- return build_int_cst (TREE_TYPE (s1), 0);
+ CASE_FLT_FN (BUILT_IN_FREXP):
+ return fold_builtin_frexp (loc, arg0, arg1, type);
- /* Return an offset into the constant string argument. */
- tem = fold_build_pointer_plus_hwi_loc (loc, s1, r - p1);
- return fold_convert_loc (loc, type, tem);
- }
+ CASE_FLT_FN (BUILT_IN_MODF):
+ return fold_builtin_modf (loc, arg0, arg1, type);
- if (p2[0] == '\0')
- /* strpbrk(x, "") == NULL.
- Evaluate and ignore s1 in case it had side-effects. */
- return omit_one_operand_loc (loc, type, integer_zero_node, s1);
+ case BUILT_IN_STRSPN:
+ return fold_builtin_strspn (loc, expr, arg0, arg1);
- if (p2[1] != '\0')
- return NULL_TREE; /* Really call strpbrk. */
+ case BUILT_IN_STRCSPN:
+ return fold_builtin_strcspn (loc, expr, arg0, arg1);
- fn = builtin_decl_implicit (BUILT_IN_STRCHR);
- if (!fn)
- return NULL_TREE;
+ case BUILT_IN_STRPBRK:
+ return fold_builtin_strpbrk (loc, expr, arg0, arg1, type);
- /* New argument list transforming strpbrk(s1, s2) to
- strchr(s1, s2[0]). */
- return build_call_expr_loc (loc, fn, 2, s1,
- build_int_cst (integer_type_node, p2[0]));
-}
+ case BUILT_IN_EXPECT:
+ return fold_builtin_expect (loc, arg0, arg1, NULL_TREE, NULL_TREE);
+
+ case BUILT_IN_ISGREATER:
+ return fold_builtin_unordered_cmp (loc, fndecl,
+ arg0, arg1, UNLE_EXPR, LE_EXPR);
+ case BUILT_IN_ISGREATEREQUAL:
+ return fold_builtin_unordered_cmp (loc, fndecl,
+ arg0, arg1, UNLT_EXPR, LT_EXPR);
+ case BUILT_IN_ISLESS:
+ return fold_builtin_unordered_cmp (loc, fndecl,
+ arg0, arg1, UNGE_EXPR, GE_EXPR);
+ case BUILT_IN_ISLESSEQUAL:
+ return fold_builtin_unordered_cmp (loc, fndecl,
+ arg0, arg1, UNGT_EXPR, GT_EXPR);
+ case BUILT_IN_ISLESSGREATER:
+ return fold_builtin_unordered_cmp (loc, fndecl,
+ arg0, arg1, UNEQ_EXPR, EQ_EXPR);
+ case BUILT_IN_ISUNORDERED:
+ return fold_builtin_unordered_cmp (loc, fndecl,
+ arg0, arg1, UNORDERED_EXPR,
+ NOP_EXPR);
+
+ /* We do the folding for va_start in the expander. */
+ case BUILT_IN_VA_START:
+ break;
+
+ case BUILT_IN_OBJECT_SIZE:
+ return fold_builtin_object_size (arg0, arg1);
-/* Simplify a call to the strspn builtin. S1 and S2 are the arguments
- to the call.
+ case BUILT_IN_ATOMIC_ALWAYS_LOCK_FREE:
+ return fold_builtin_atomic_always_lock_free (arg0, arg1);
- Return NULL_TREE if no simplification was possible, otherwise return the
- simplified form of the call as a tree.
+ case BUILT_IN_ATOMIC_IS_LOCK_FREE:
+ return fold_builtin_atomic_is_lock_free (arg0, arg1);
- The simplified form may be a constant or other expression which
- computes the same value, but in a more efficient manner (including
- calls to other builtin functions).
+ default:
+ break;
+ }
+ return NULL_TREE;
+}
- The call may contain arguments which need to be evaluated, but
- which are not useful to determine the result of the call. In
- this case we return a chain of COMPOUND_EXPRs. The LHS of each
- COMPOUND_EXPR will be an argument which must be evaluated.
- COMPOUND_EXPRs are chained through their RHS. The RHS of the last
- COMPOUND_EXPR in the chain will contain the tree for the simplified
- form of the builtin function call. */
+/* Fold a call to built-in function FNDECL with 3 arguments, ARG0, ARG1,
+ and ARG2.
+ This function returns NULL_TREE if no simplification was possible. */
static tree
-fold_builtin_strspn (location_t loc, tree expr, tree s1, tree s2)
+fold_builtin_3 (location_t loc, tree fndecl,
+ tree arg0, tree arg1, tree arg2)
{
- if (!validate_arg (s1, POINTER_TYPE)
- || !validate_arg (s2, POINTER_TYPE))
- return NULL_TREE;
+ tree type = TREE_TYPE (TREE_TYPE (fndecl));
+ enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
- if (!check_nul_terminated_array (expr, s1)
- || !check_nul_terminated_array (expr, s2))
+ if (TREE_CODE (arg0) == ERROR_MARK
+ || TREE_CODE (arg1) == ERROR_MARK
+ || TREE_CODE (arg2) == ERROR_MARK)
return NULL_TREE;
- const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
+ if (tree ret = fold_const_call (as_combined_fn (fcode), type,
+ arg0, arg1, arg2))
+ return ret;
- /* If either argument is "", return NULL_TREE. */
- if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
- /* Evaluate and ignore both arguments in case either one has
- side-effects. */
- return omit_two_operands_loc (loc, size_type_node, size_zero_node,
- s1, s2);
- return NULL_TREE;
-}
+ switch (fcode)
+ {
-/* Simplify a call to the strcspn builtin. S1 and S2 are the arguments
- to the call.
+ CASE_FLT_FN (BUILT_IN_SINCOS):
+ return fold_builtin_sincos (loc, arg0, arg1, arg2);
- Return NULL_TREE if no simplification was possible, otherwise return the
- simplified form of the call as a tree.
+ CASE_FLT_FN (BUILT_IN_REMQUO):
+ if (validate_arg (arg0, REAL_TYPE)
+ && validate_arg (arg1, REAL_TYPE)
+ && validate_arg (arg2, POINTER_TYPE))
+ return do_mpfr_remquo (arg0, arg1, arg2);
+ break;
- The simplified form may be a constant or other expression which
- computes the same value, but in a more efficient manner (including
- calls to other builtin functions).
+ case BUILT_IN_MEMCMP:
+ return fold_builtin_memcmp (loc, arg0, arg1, arg2);
- The call may contain arguments which need to be evaluated, but
- which are not useful to determine the result of the call. In
- this case we return a chain of COMPOUND_EXPRs. The LHS of each
- COMPOUND_EXPR will be an argument which must be evaluated.
- COMPOUND_EXPRs are chained through their RHS. The RHS of the last
- COMPOUND_EXPR in the chain will contain the tree for the simplified
- form of the builtin function call. */
+ case BUILT_IN_EXPECT:
+ return fold_builtin_expect (loc, arg0, arg1, arg2, NULL_TREE);
-static tree
-fold_builtin_strcspn (location_t loc, tree expr, tree s1, tree s2)
-{
- if (!validate_arg (s1, POINTER_TYPE)
- || !validate_arg (s2, POINTER_TYPE))
- return NULL_TREE;
+ case BUILT_IN_EXPECT_WITH_PROBABILITY:
+ return fold_builtin_expect (loc, arg0, arg1, NULL_TREE, arg2);
- if (!check_nul_terminated_array (expr, s1)
- || !check_nul_terminated_array (expr, s2))
- return NULL_TREE;
+ case BUILT_IN_ADD_OVERFLOW:
+ case BUILT_IN_SUB_OVERFLOW:
+ case BUILT_IN_MUL_OVERFLOW:
+ case BUILT_IN_ADD_OVERFLOW_P:
+ case BUILT_IN_SUB_OVERFLOW_P:
+ case BUILT_IN_MUL_OVERFLOW_P:
+ case BUILT_IN_SADD_OVERFLOW:
+ case BUILT_IN_SADDL_OVERFLOW:
+ case BUILT_IN_SADDLL_OVERFLOW:
+ case BUILT_IN_SSUB_OVERFLOW:
+ case BUILT_IN_SSUBL_OVERFLOW:
+ case BUILT_IN_SSUBLL_OVERFLOW:
+ case BUILT_IN_SMUL_OVERFLOW:
+ case BUILT_IN_SMULL_OVERFLOW:
+ case BUILT_IN_SMULLL_OVERFLOW:
+ case BUILT_IN_UADD_OVERFLOW:
+ case BUILT_IN_UADDL_OVERFLOW:
+ case BUILT_IN_UADDLL_OVERFLOW:
+ case BUILT_IN_USUB_OVERFLOW:
+ case BUILT_IN_USUBL_OVERFLOW:
+ case BUILT_IN_USUBLL_OVERFLOW:
+ case BUILT_IN_UMUL_OVERFLOW:
+ case BUILT_IN_UMULL_OVERFLOW:
+ case BUILT_IN_UMULLL_OVERFLOW:
+ return fold_builtin_arith_overflow (loc, fcode, arg0, arg1, arg2);
- /* If the first argument is "", return NULL_TREE. */
- const char *p1 = c_getstr (s1);
- if (p1 && *p1 == '\0')
- {
- /* Evaluate and ignore argument s2 in case it has
- side-effects. */
- return omit_one_operand_loc (loc, size_type_node,
- size_zero_node, s2);
+ default:
+ break;
}
+ return NULL_TREE;
+}
- /* If the second argument is "", return __builtin_strlen(s1). */
- const char *p2 = c_getstr (s2);
- if (p2 && *p2 == '\0')
- {
- tree fn = builtin_decl_implicit (BUILT_IN_STRLEN);
+/* Folds a call EXPR (which may be null) to built-in function FNDECL.
+ ARGS is an array of NARGS arguments. IGNORE is true if the result
+ of the function call is ignored. This function returns NULL_TREE
+ if no simplification was possible. */
- /* If the replacement _DECL isn't initialized, don't do the
- transformation. */
- if (!fn)
- return NULL_TREE;
+static tree
+fold_builtin_n (location_t loc, tree expr, tree fndecl, tree *args,
+ int nargs, bool)
+{
+ tree ret = NULL_TREE;
- return build_call_expr_loc (loc, fn, 1, s1);
+ switch (nargs)
+ {
+ case 0:
+ ret = fold_builtin_0 (loc, fndecl);
+ break;
+ case 1:
+ ret = fold_builtin_1 (loc, expr, fndecl, args[0]);
+ break;
+ case 2:
+ ret = fold_builtin_2 (loc, expr, fndecl, args[0], args[1]);
+ break;
+ case 3:
+ ret = fold_builtin_3 (loc, fndecl, args[0], args[1], args[2]);
+ break;
+ default:
+ ret = fold_builtin_varargs (loc, fndecl, args, nargs);
+ break;
+ }
+ if (ret)
+ {
+ ret = build1 (NOP_EXPR, TREE_TYPE (ret), ret);
+ SET_EXPR_LOCATION (ret, loc);
+ return ret;
}
return NULL_TREE;
}
-/* Fold the next_arg or va_start call EXP. Returns true if there was an error
- produced. False otherwise. This is done so that we don't output the error
- or warning twice or three times. */
+/* Construct a new CALL_EXPR to FNDECL using the tail of the argument
+ list ARGS along with N new arguments in NEWARGS. SKIP is the number
+ of arguments in ARGS to be omitted. OLDNARGS is the number of
+ elements in ARGS. */
-bool
-fold_builtin_next_arg (tree exp, bool va_start_p)
+static tree
+rewrite_call_expr_valist (location_t loc, int oldnargs, tree *args,
+ int skip, tree fndecl, int n, va_list newargs)
{
- tree fntype = TREE_TYPE (current_function_decl);
- int nargs = call_expr_nargs (exp);
- tree arg;
- /* There is good chance the current input_location points inside the
- definition of the va_start macro (perhaps on the token for
- builtin) in a system header, so warnings will not be emitted.
- Use the location in real source code. */
- location_t current_location =
- linemap_unwind_to_first_non_reserved_loc (line_table, input_location,
- NULL);
+ int nargs = oldnargs - skip + n;
+ tree *buffer;
- if (!stdarg_p (fntype))
+ if (n > 0)
{
- error ("%<va_start%> used in function with fixed arguments");
- return true;
- }
+ int i, j;
- if (va_start_p)
- {
- if (va_start_p && (nargs != 2))
- {
- error ("wrong number of arguments to function %<va_start%>");
- return true;
- }
- arg = CALL_EXPR_ARG (exp, 1);
+ buffer = XALLOCAVEC (tree, nargs);
+ for (i = 0; i < n; i++)
+ buffer[i] = va_arg (newargs, tree);
+ for (j = skip; j < oldnargs; j++, i++)
+ buffer[i] = args[j];
}
- /* We use __builtin_va_start (ap, 0, 0) or __builtin_next_arg (0, 0)
- when we checked the arguments and if needed issued a warning. */
else
- {
- if (nargs == 0)
- {
- /* Evidently an out of date version of <stdarg.h>; can't validate
- va_start's second argument, but can still work as intended. */
- warning_at (current_location,
- OPT_Wvarargs,
- "%<__builtin_next_arg%> called without an argument");
- return true;
- }
- else if (nargs > 1)
- {
- error ("wrong number of arguments to function %<__builtin_next_arg%>");
- return true;
- }
- arg = CALL_EXPR_ARG (exp, 0);
- }
+ buffer = args + skip;
- if (TREE_CODE (arg) == SSA_NAME
- && SSA_NAME_VAR (arg))
- arg = SSA_NAME_VAR (arg);
+ return build_call_expr_loc_array (loc, fndecl, nargs, buffer);
+}
+
+/* Return true if FNDECL shouldn't be folded right now.
+ If a built-in function has an inline attribute always_inline
+ wrapper, defer folding it after always_inline functions have
+ been inlined, otherwise e.g. -D_FORTIFY_SOURCE checking
+ might not be performed. */
+
+bool
+avoid_folding_inline_builtin (tree fndecl)
+{
+ return (DECL_DECLARED_INLINE_P (fndecl)
+ && DECL_DISREGARD_INLINE_LIMITS (fndecl)
+ && cfun
+ && !cfun->always_inline_functions_inlined
+ && lookup_attribute ("always_inline", DECL_ATTRIBUTES (fndecl)));
+}
+
+/* A wrapper function for builtin folding that prevents warnings for
+ "statement without effect" and the like, caused by removing the
+ call node earlier than the warning is generated. */
- /* We destructively modify the call to be __builtin_va_start (ap, 0)
- or __builtin_next_arg (0) the first time we see it, after checking
- the arguments and if needed issuing a warning. */
- if (!integer_zerop (arg))
+tree
+fold_call_expr (location_t loc, tree exp, bool ignore)
+{
+ tree ret = NULL_TREE;
+ tree fndecl = get_callee_fndecl (exp);
+ if (fndecl && fndecl_built_in_p (fndecl)
+ /* If CALL_EXPR_VA_ARG_PACK is set, the arguments aren't finalized
+ yet. Defer folding until we see all the arguments
+ (after inlining). */
+ && !CALL_EXPR_VA_ARG_PACK (exp))
{
- tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
+ int nargs = call_expr_nargs (exp);
- /* Strip off all nops for the sake of the comparison. This
- is not quite the same as STRIP_NOPS. It does more.
- We must also strip off INDIRECT_EXPR for C++ reference
- parameters. */
- while (CONVERT_EXPR_P (arg)
- || TREE_CODE (arg) == INDIRECT_REF)
- arg = TREE_OPERAND (arg, 0);
- if (arg != last_parm)
+ /* Before gimplification CALL_EXPR_VA_ARG_PACK is not set, but
+ instead last argument is __builtin_va_arg_pack (). Defer folding
+ even in that case, until arguments are finalized. */
+ if (nargs && TREE_CODE (CALL_EXPR_ARG (exp, nargs - 1)) == CALL_EXPR)
{
- /* FIXME: Sometimes with the tree optimizers we can get the
- not the last argument even though the user used the last
- argument. We just warn and set the arg to be the last
- argument so that we will get wrong-code because of
- it. */
- warning_at (current_location,
- OPT_Wvarargs,
- "second parameter of %<va_start%> not last named argument");
+ tree fndecl2 = get_callee_fndecl (CALL_EXPR_ARG (exp, nargs - 1));
+ if (fndecl2 && fndecl_built_in_p (fndecl2, BUILT_IN_VA_ARG_PACK))
+ return NULL_TREE;
}
- /* Undefined by C99 7.15.1.4p4 (va_start):
- "If the parameter parmN is declared with the register storage
- class, with a function or array type, or with a type that is
- not compatible with the type that results after application of
- the default argument promotions, the behavior is undefined."
- */
- else if (DECL_REGISTER (arg))
- {
- warning_at (current_location,
- OPT_Wvarargs,
- "undefined behavior when second parameter of "
- "%<va_start%> is declared with %<register%> storage");
- }
+ if (avoid_folding_inline_builtin (fndecl))
+ return NULL_TREE;
- /* We want to verify the second parameter just once before the tree
- optimizers are run and then avoid keeping it in the tree,
- as otherwise we could warn even for correct code like:
- void foo (int i, ...)
- { va_list ap; i++; va_start (ap, i); va_end (ap); } */
- if (va_start_p)
- CALL_EXPR_ARG (exp, 1) = integer_zero_node;
+ if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
+ return targetm.fold_builtin (fndecl, call_expr_nargs (exp),
+ CALL_EXPR_ARGP (exp), ignore);
else
- CALL_EXPR_ARG (exp, 0) = integer_zero_node;
+ {
+ tree *args = CALL_EXPR_ARGP (exp);
+ ret = fold_builtin_n (loc, exp, fndecl, args, nargs, ignore);
+ if (ret)
+ return ret;
+ }
}
- return false;
+ return NULL_TREE;
}
+/* Fold a CALL_EXPR with type TYPE with FN as the function expression.
+ N arguments are passed in the array ARGARRAY. Return a folded
+ expression or NULL_TREE if no simplification was possible. */
-/* Expand a call EXP to __builtin_object_size. */
-
-static rtx
-expand_builtin_object_size (tree exp)
+tree
+fold_builtin_call_array (location_t loc, tree,
+ tree fn,
+ int n,
+ tree *argarray)
{
- tree ost;
- int object_size_type;
- tree fndecl = get_callee_fndecl (exp);
+ if (TREE_CODE (fn) != ADDR_EXPR)
+ return NULL_TREE;
- if (!validate_arglist (exp, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ tree fndecl = TREE_OPERAND (fn, 0);
+ if (TREE_CODE (fndecl) == FUNCTION_DECL
+ && fndecl_built_in_p (fndecl))
{
- error ("first argument of %qD must be a pointer, second integer constant",
- fndecl);
- expand_builtin_trap ();
- return const0_rtx;
+ /* If last argument is __builtin_va_arg_pack (), arguments to this
+ function are not finalized yet. Defer folding until they are. */
+ if (n && TREE_CODE (argarray[n - 1]) == CALL_EXPR)
+ {
+ tree fndecl2 = get_callee_fndecl (argarray[n - 1]);
+ if (fndecl2 && fndecl_built_in_p (fndecl2, BUILT_IN_VA_ARG_PACK))
+ return NULL_TREE;
+ }
+ if (avoid_folding_inline_builtin (fndecl))
+ return NULL_TREE;
+ if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
+ return targetm.fold_builtin (fndecl, n, argarray, false);
+ else
+ return fold_builtin_n (loc, NULL_TREE, fndecl, argarray, n, false);
}
- ost = CALL_EXPR_ARG (exp, 1);
- STRIP_NOPS (ost);
+ return NULL_TREE;
+}
- if (TREE_CODE (ost) != INTEGER_CST
- || tree_int_cst_sgn (ost) < 0
- || compare_tree_int (ost, 3) > 0)
- {
- error ("last argument of %qD is not integer constant between 0 and 3",
- fndecl);
- expand_builtin_trap ();
- return const0_rtx;
- }
+/* Construct a new CALL_EXPR using the tail of the argument list of EXP
+ along with N new arguments specified as the "..." parameters. SKIP
+ is the number of arguments in EXP to be omitted. This function is used
+ to do varargs-to-varargs transformations. */
- object_size_type = tree_to_shwi (ost);
+static tree
+rewrite_call_expr (location_t loc, tree exp, int skip, tree fndecl, int n, ...)
+{
+ va_list ap;
+ tree t;
- return object_size_type < 2 ? constm1_rtx : const0_rtx;
+ va_start (ap, n);
+ t = rewrite_call_expr_valist (loc, call_expr_nargs (exp),
+ CALL_EXPR_ARGP (exp), skip, fndecl, n, ap);
+ va_end (ap);
+
+ return t;
}
-/* Expand EXP, a call to the __mem{cpy,pcpy,move,set}_chk builtin.
- FCODE is the BUILT_IN_* to use.
- Return NULL_RTX if we failed; the caller should emit a normal call,
- otherwise try to get the result in TARGET, if convenient (and in
- mode MODE if that's convenient). */
+/* Validate a single argument ARG against a tree code CODE representing
+ a type. Return true when argument is valid. */
-static rtx
-expand_builtin_memory_chk (tree exp, rtx target, machine_mode mode,
- enum built_in_function fcode)
+static bool
+validate_arg (const_tree arg, enum tree_code code)
{
- if (!validate_arglist (exp,
- POINTER_TYPE,
- fcode == BUILT_IN_MEMSET_CHK
- ? INTEGER_TYPE : POINTER_TYPE,
- INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
- return NULL_RTX;
+ if (!arg)
+ return false;
+ else if (code == POINTER_TYPE)
+ return POINTER_TYPE_P (TREE_TYPE (arg));
+ else if (code == INTEGER_TYPE)
+ return INTEGRAL_TYPE_P (TREE_TYPE (arg));
+ return code == TREE_CODE (TREE_TYPE (arg));
+}
- tree dest = CALL_EXPR_ARG (exp, 0);
- tree src = CALL_EXPR_ARG (exp, 1);
- tree len = CALL_EXPR_ARG (exp, 2);
- tree size = CALL_EXPR_ARG (exp, 3);
+/* This function validates the types of a function call argument list
+ against a specified list of tree_codes. If the last specifier is a 0,
+ that represents an ellipses, otherwise the last specifier must be a
+ VOID_TYPE.
- /* FIXME: Set access mode to write only for memset et al. */
- bool sizes_ok = check_access (exp, len, /*maxread=*/NULL_TREE,
- /*srcstr=*/NULL_TREE, size, access_read_write);
+ This is the GIMPLE version of validate_arglist. Eventually we want to
+ completely convert builtins.c to work from GIMPLEs and the tree based
+ validate_arglist will then be removed. */
- if (!tree_fits_uhwi_p (size))
- return NULL_RTX;
+bool
+validate_gimple_arglist (const gcall *call, ...)
+{
+ enum tree_code code;
+ bool res = 0;
+ va_list ap;
+ const_tree arg;
+ size_t i;
- if (tree_fits_uhwi_p (len) || integer_all_onesp (size))
- {
- /* Avoid transforming the checking call to an ordinary one when
- an overflow has been detected or when the call couldn't be
- validated because the size is not constant. */
- if (!sizes_ok && !integer_all_onesp (size) && tree_int_cst_lt (size, len))
- return NULL_RTX;
+ va_start (ap, call);
+ i = 0;
- tree fn = NULL_TREE;
- /* If __builtin_mem{cpy,pcpy,move,set}_chk is used, assume
- mem{cpy,pcpy,move,set} is available. */
- switch (fcode)
+ do
+ {
+ code = (enum tree_code) va_arg (ap, int);
+ switch (code)
{
- case BUILT_IN_MEMCPY_CHK:
- fn = builtin_decl_explicit (BUILT_IN_MEMCPY);
- break;
- case BUILT_IN_MEMPCPY_CHK:
- fn = builtin_decl_explicit (BUILT_IN_MEMPCPY);
- break;
- case BUILT_IN_MEMMOVE_CHK:
- fn = builtin_decl_explicit (BUILT_IN_MEMMOVE);
- break;
- case BUILT_IN_MEMSET_CHK:
- fn = builtin_decl_explicit (BUILT_IN_MEMSET);
- break;
+ case 0:
+ /* This signifies an ellipses, any further arguments are all ok. */
+ res = true;
+ goto end;
+ case VOID_TYPE:
+ /* This signifies an endlink, if no arguments remain, return
+ true, otherwise return false. */
+ res = (i == gimple_call_num_args (call));
+ goto end;
default:
+ /* If no parameters remain or the parameter's code does not
+ match the specified code, return false. Otherwise continue
+ checking any remaining arguments. */
+ arg = gimple_call_arg (call, i++);
+ if (!validate_arg (arg, code))
+ goto end;
break;
}
+ }
+ while (1);
- if (! fn)
- return NULL_RTX;
+ /* We need gotos here since we can only have one VA_CLOSE in a
+ function. */
+ end: ;
+ va_end (ap);
- fn = build_call_nofold_loc (EXPR_LOCATION (exp), fn, 3, dest, src, len);
- gcc_assert (TREE_CODE (fn) == CALL_EXPR);
- CALL_EXPR_TAILCALL (fn) = CALL_EXPR_TAILCALL (exp);
- return expand_expr (fn, target, mode, EXPAND_NORMAL);
- }
- else if (fcode == BUILT_IN_MEMSET_CHK)
- return NULL_RTX;
- else
- {
- unsigned int dest_align = get_pointer_alignment (dest);
+ return res;
+}
- /* If DEST is not a pointer type, call the normal function. */
- if (dest_align == 0)
- return NULL_RTX;
+/* Default target-specific builtin expander that does nothing. */
- /* If SRC and DEST are the same (and not volatile), do nothing. */
- if (operand_equal_p (src, dest, 0))
- {
- tree expr;
+rtx
+default_expand_builtin (tree exp ATTRIBUTE_UNUSED,
+ rtx target ATTRIBUTE_UNUSED,
+ rtx subtarget ATTRIBUTE_UNUSED,
+ machine_mode mode ATTRIBUTE_UNUSED,
+ int ignore ATTRIBUTE_UNUSED)
+{
+ return NULL_RTX;
+}
- if (fcode != BUILT_IN_MEMPCPY_CHK)
- {
- /* Evaluate and ignore LEN in case it has side-effects. */
- expand_expr (len, const0_rtx, VOIDmode, EXPAND_NORMAL);
- return expand_expr (dest, target, mode, EXPAND_NORMAL);
- }
+/* Returns true is EXP represents data that would potentially reside
+ in a readonly section. */
- expr = fold_build_pointer_plus (dest, len);
- return expand_expr (expr, target, mode, EXPAND_NORMAL);
- }
+bool
+readonly_data_expr (tree exp)
+{
+ STRIP_NOPS (exp);
- /* __memmove_chk special case. */
- if (fcode == BUILT_IN_MEMMOVE_CHK)
- {
- unsigned int src_align = get_pointer_alignment (src);
+ if (TREE_CODE (exp) != ADDR_EXPR)
+ return false;
- if (src_align == 0)
- return NULL_RTX;
+ exp = get_base_address (TREE_OPERAND (exp, 0));
+ if (!exp)
+ return false;
- /* If src is categorized for a readonly section we can use
- normal __memcpy_chk. */
- if (readonly_data_expr (src))
- {
- tree fn = builtin_decl_explicit (BUILT_IN_MEMCPY_CHK);
- if (!fn)
- return NULL_RTX;
- fn = build_call_nofold_loc (EXPR_LOCATION (exp), fn, 4,
- dest, src, len, size);
- gcc_assert (TREE_CODE (fn) == CALL_EXPR);
- CALL_EXPR_TAILCALL (fn) = CALL_EXPR_TAILCALL (exp);
- return expand_expr (fn, target, mode, EXPAND_NORMAL);
- }
- }
- return NULL_RTX;
- }
+ /* Make sure we call decl_readonly_section only for trees it
+ can handle (since it returns true for everything it doesn't
+ understand). */
+ if (TREE_CODE (exp) == STRING_CST
+ || TREE_CODE (exp) == CONSTRUCTOR
+ || (VAR_P (exp) && TREE_STATIC (exp)))
+ return decl_readonly_section (exp, 0);
+ else
+ return false;
}
-/* Emit warning if a buffer overflow is detected at compile time. */
+/* Simplify a call to the strpbrk builtin. S1 and S2 are the arguments
+ to the call, and TYPE is its return type.
-static void
-maybe_emit_chk_warning (tree exp, enum built_in_function fcode)
-{
- /* The source string. */
- tree srcstr = NULL_TREE;
- /* The size of the destination object returned by __builtin_object_size. */
- tree objsize = NULL_TREE;
- /* The string that is being concatenated with (as in __strcat_chk)
- or null if it isn't. */
- tree catstr = NULL_TREE;
- /* The maximum length of the source sequence in a bounded operation
- (such as __strncat_chk) or null if the operation isn't bounded
- (such as __strcat_chk). */
- tree maxread = NULL_TREE;
- /* The exact size of the access (such as in __strncpy_chk). */
- tree size = NULL_TREE;
- /* The access by the function that's checked. Except for snprintf
- both writing and reading is checked. */
- access_mode mode = access_read_write;
+ Return NULL_TREE if no simplification was possible, otherwise return the
+ simplified form of the call as a tree.
- switch (fcode)
- {
- case BUILT_IN_STRCPY_CHK:
- case BUILT_IN_STPCPY_CHK:
- srcstr = CALL_EXPR_ARG (exp, 1);
- objsize = CALL_EXPR_ARG (exp, 2);
- break;
+ The simplified form may be a constant or other expression which
+ computes the same value, but in a more efficient manner (including
+ calls to other builtin functions).
- case BUILT_IN_STRCAT_CHK:
- /* For __strcat_chk the warning will be emitted only if overflowing
- by at least strlen (dest) + 1 bytes. */
- catstr = CALL_EXPR_ARG (exp, 0);
- srcstr = CALL_EXPR_ARG (exp, 1);
- objsize = CALL_EXPR_ARG (exp, 2);
- break;
+ The call may contain arguments which need to be evaluated, but
+ which are not useful to determine the result of the call. In
+ this case we return a chain of COMPOUND_EXPRs. The LHS of each
+ COMPOUND_EXPR will be an argument which must be evaluated.
+ COMPOUND_EXPRs are chained through their RHS. The RHS of the last
+ COMPOUND_EXPR in the chain will contain the tree for the simplified
+ form of the builtin function call. */
- case BUILT_IN_STRNCAT_CHK:
- catstr = CALL_EXPR_ARG (exp, 0);
- srcstr = CALL_EXPR_ARG (exp, 1);
- maxread = CALL_EXPR_ARG (exp, 2);
- objsize = CALL_EXPR_ARG (exp, 3);
- break;
+static tree
+fold_builtin_strpbrk (location_t loc, tree, tree s1, tree s2, tree type)
+{
+ if (!validate_arg (s1, POINTER_TYPE)
+ || !validate_arg (s2, POINTER_TYPE))
+ return NULL_TREE;
- case BUILT_IN_STRNCPY_CHK:
- case BUILT_IN_STPNCPY_CHK:
- srcstr = CALL_EXPR_ARG (exp, 1);
- size = CALL_EXPR_ARG (exp, 2);
- objsize = CALL_EXPR_ARG (exp, 3);
- break;
+ tree fn;
+ const char *p1, *p2;
- case BUILT_IN_SNPRINTF_CHK:
- case BUILT_IN_VSNPRINTF_CHK:
- maxread = CALL_EXPR_ARG (exp, 1);
- objsize = CALL_EXPR_ARG (exp, 3);
- /* The only checked access the write to the destination. */
- mode = access_write_only;
- break;
- default:
- gcc_unreachable ();
- }
+ p2 = c_getstr (s2);
+ if (p2 == NULL)
+ return NULL_TREE;
- if (catstr && maxread)
+ p1 = c_getstr (s1);
+ if (p1 != NULL)
{
- /* Check __strncat_chk. There is no way to determine the length
- of the string to which the source string is being appended so
- just warn when the length of the source string is not known. */
- check_strncat_sizes (exp, objsize);
- return;
+ const char *r = strpbrk (p1, p2);
+ tree tem;
+
+ if (r == NULL)
+ return build_int_cst (TREE_TYPE (s1), 0);
+
+ /* Return an offset into the constant string argument. */
+ tem = fold_build_pointer_plus_hwi_loc (loc, s1, r - p1);
+ return fold_convert_loc (loc, type, tem);
}
- check_access (exp, size, maxread, srcstr, objsize, mode);
-}
+ if (p2[0] == '\0')
+ /* strpbrk(x, "") == NULL.
+ Evaluate and ignore s1 in case it had side-effects. */
+ return omit_one_operand_loc (loc, type, integer_zero_node, s1);
-/* Emit warning if a buffer overflow is detected at compile time
- in __sprintf_chk/__vsprintf_chk calls. */
+ if (p2[1] != '\0')
+ return NULL_TREE; /* Really call strpbrk. */
-static void
-maybe_emit_sprintf_chk_warning (tree exp, enum built_in_function fcode)
-{
- tree size, len, fmt;
- const char *fmt_str;
- int nargs = call_expr_nargs (exp);
+ fn = builtin_decl_implicit (BUILT_IN_STRCHR);
+ if (!fn)
+ return NULL_TREE;
- /* Verify the required arguments in the original call. */
+ /* New argument list transforming strpbrk(s1, s2) to
+ strchr(s1, s2[0]). */
+ return build_call_expr_loc (loc, fn, 2, s1,
+ build_int_cst (integer_type_node, p2[0]));
+}
- if (nargs < 4)
- return;
- size = CALL_EXPR_ARG (exp, 2);
- fmt = CALL_EXPR_ARG (exp, 3);
+/* Simplify a call to the strspn builtin. S1 and S2 are the arguments
+ to the call.
- if (! tree_fits_uhwi_p (size) || integer_all_onesp (size))
- return;
+ Return NULL_TREE if no simplification was possible, otherwise return the
+ simplified form of the call as a tree.
- /* Check whether the format is a literal string constant. */
- fmt_str = c_getstr (fmt);
- if (fmt_str == NULL)
- return;
+ The simplified form may be a constant or other expression which
+ computes the same value, but in a more efficient manner (including
+ calls to other builtin functions).
- if (!init_target_chars ())
- return;
+ The call may contain arguments which need to be evaluated, but
+ which are not useful to determine the result of the call. In
+ this case we return a chain of COMPOUND_EXPRs. The LHS of each
+ COMPOUND_EXPR will be an argument which must be evaluated.
+ COMPOUND_EXPRs are chained through their RHS. The RHS of the last
+ COMPOUND_EXPR in the chain will contain the tree for the simplified
+ form of the builtin function call. */
- /* If the format doesn't contain % args or %%, we know its size. */
- if (strchr (fmt_str, target_percent) == 0)
- len = build_int_cstu (size_type_node, strlen (fmt_str));
- /* If the format is "%s" and first ... argument is a string literal,
- we know it too. */
- else if (fcode == BUILT_IN_SPRINTF_CHK
- && strcmp (fmt_str, target_percent_s) == 0)
- {
- tree arg;
+static tree
+fold_builtin_strspn (location_t loc, tree expr, tree s1, tree s2)
+{
+ if (!validate_arg (s1, POINTER_TYPE)
+ || !validate_arg (s2, POINTER_TYPE))
+ return NULL_TREE;
- if (nargs < 5)
- return;
- arg = CALL_EXPR_ARG (exp, 4);
- if (! POINTER_TYPE_P (TREE_TYPE (arg)))
- return;
+ if (!check_nul_terminated_array (expr, s1)
+ || !check_nul_terminated_array (expr, s2))
+ return NULL_TREE;
- len = c_strlen (arg, 1);
- if (!len || ! tree_fits_uhwi_p (len))
- return;
- }
- else
- return;
+ const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
+
+ /* If either argument is "", return NULL_TREE. */
+ if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
+ /* Evaluate and ignore both arguments in case either one has
+ side-effects. */
+ return omit_two_operands_loc (loc, size_type_node, size_zero_node,
+ s1, s2);
+ return NULL_TREE;
+}
- /* Add one for the terminating nul. */
- len = fold_build2 (PLUS_EXPR, TREE_TYPE (len), len, size_one_node);
+/* Simplify a call to the strcspn builtin. S1 and S2 are the arguments
+ to the call.
- check_access (exp, /*size=*/NULL_TREE, /*maxread=*/NULL_TREE, len, size,
- access_write_only);
-}
+ Return NULL_TREE if no simplification was possible, otherwise return the
+ simplified form of the call as a tree.
-/* Return true if STMT is a call to an allocation function. Unless
- ALL_ALLOC is set, consider only functions that return dynmamically
- allocated objects. Otherwise return true even for all forms of
- alloca (including VLA). */
+ The simplified form may be a constant or other expression which
+ computes the same value, but in a more efficient manner (including
+ calls to other builtin functions).
-static bool
-fndecl_alloc_p (tree fndecl, bool all_alloc)
+ The call may contain arguments which need to be evaluated, but
+ which are not useful to determine the result of the call. In
+ this case we return a chain of COMPOUND_EXPRs. The LHS of each
+ COMPOUND_EXPR will be an argument which must be evaluated.
+ COMPOUND_EXPRs are chained through their RHS. The RHS of the last
+ COMPOUND_EXPR in the chain will contain the tree for the simplified
+ form of the builtin function call. */
+
+static tree
+fold_builtin_strcspn (location_t loc, tree expr, tree s1, tree s2)
{
- if (!fndecl)
- return false;
+ if (!validate_arg (s1, POINTER_TYPE)
+ || !validate_arg (s2, POINTER_TYPE))
+ return NULL_TREE;
- /* A call to operator new isn't recognized as one to a built-in. */
- if (DECL_IS_OPERATOR_NEW_P (fndecl))
- return true;
+ if (!check_nul_terminated_array (expr, s1)
+ || !check_nul_terminated_array (expr, s2))
+ return NULL_TREE;
- if (fndecl_built_in_p (fndecl, BUILT_IN_NORMAL))
+ /* If the first argument is "", return NULL_TREE. */
+ const char *p1 = c_getstr (s1);
+ if (p1 && *p1 == '\0')
{
- switch (DECL_FUNCTION_CODE (fndecl))
- {
- case BUILT_IN_ALLOCA:
- case BUILT_IN_ALLOCA_WITH_ALIGN:
- return all_alloc;
- case BUILT_IN_ALIGNED_ALLOC:
- case BUILT_IN_CALLOC:
- case BUILT_IN_GOMP_ALLOC:
- case BUILT_IN_MALLOC:
- case BUILT_IN_REALLOC:
- case BUILT_IN_STRDUP:
- case BUILT_IN_STRNDUP:
- return true;
- default:
- break;
- }
+ /* Evaluate and ignore argument s2 in case it has
+ side-effects. */
+ return omit_one_operand_loc (loc, size_type_node,
+ size_zero_node, s2);
}
- /* A function is considered an allocation function if it's declared
- with attribute malloc with an argument naming its associated
- deallocation function. */
- tree attrs = DECL_ATTRIBUTES (fndecl);
- if (!attrs)
- return false;
-
- for (tree allocs = attrs;
- (allocs = lookup_attribute ("malloc", allocs));
- allocs = TREE_CHAIN (allocs))
+ /* If the second argument is "", return __builtin_strlen(s1). */
+ const char *p2 = c_getstr (s2);
+ if (p2 && *p2 == '\0')
{
- tree args = TREE_VALUE (allocs);
- if (!args)
- continue;
-
- if (TREE_VALUE (args))
- return true;
- }
-
- return false;
-}
+ tree fn = builtin_decl_implicit (BUILT_IN_STRLEN);
-/* Return true if STMT is a call to an allocation function. A wrapper
- around fndecl_alloc_p. */
+ /* If the replacement _DECL isn't initialized, don't do the
+ transformation. */
+ if (!fn)
+ return NULL_TREE;
-static bool
-gimple_call_alloc_p (gimple *stmt, bool all_alloc = false)
-{
- return fndecl_alloc_p (gimple_call_fndecl (stmt), all_alloc);
+ return build_call_expr_loc (loc, fn, 1, s1);
+ }
+ return NULL_TREE;
}
-/* Return the zero-based number corresponding to the argument being
- deallocated if STMT is a call to a deallocation function or UINT_MAX
- if it isn't. */
+/* Fold the next_arg or va_start call EXP. Returns true if there was an error
+ produced. False otherwise. This is done so that we don't output the error
+ or warning twice or three times. */
-static unsigned
-call_dealloc_argno (tree exp)
+bool
+fold_builtin_next_arg (tree exp, bool va_start_p)
{
- tree fndecl = get_callee_fndecl (exp);
- if (!fndecl)
- return UINT_MAX;
-
- return fndecl_dealloc_argno (fndecl);
-}
-
-/* Return the zero-based number corresponding to the argument being
- deallocated if FNDECL is a deallocation function or UINT_MAX
- if it isn't. */
+ tree fntype = TREE_TYPE (current_function_decl);
+ int nargs = call_expr_nargs (exp);
+ tree arg;
+ /* There is good chance the current input_location points inside the
+ definition of the va_start macro (perhaps on the token for
+ builtin) in a system header, so warnings will not be emitted.
+ Use the location in real source code. */
+ location_t current_location =
+ linemap_unwind_to_first_non_reserved_loc (line_table, input_location,
+ NULL);
-unsigned
-fndecl_dealloc_argno (tree fndecl)
-{
- /* A call to operator delete isn't recognized as one to a built-in. */
- if (DECL_IS_OPERATOR_DELETE_P (fndecl))
+ if (!stdarg_p (fntype))
{
- if (DECL_IS_REPLACEABLE_OPERATOR (fndecl))
- return 0;
-
- /* Avoid placement delete that's not been inlined. */
- tree fname = DECL_ASSEMBLER_NAME (fndecl);
- if (id_equal (fname, "_ZdlPvS_") // ordinary form
- || id_equal (fname, "_ZdaPvS_")) // array form
- return UINT_MAX;
- return 0;
+ error ("%<va_start%> used in function with fixed arguments");
+ return true;
}
- /* TODO: Handle user-defined functions with attribute malloc? Handle
- known non-built-ins like fopen? */
- if (fndecl_built_in_p (fndecl, BUILT_IN_NORMAL))
+ if (va_start_p)
{
- switch (DECL_FUNCTION_CODE (fndecl))
+ if (va_start_p && (nargs != 2))
{
- case BUILT_IN_FREE:
- case BUILT_IN_REALLOC:
- return 0;
- default:
- break;
+ error ("wrong number of arguments to function %<va_start%>");
+ return true;
}
- return UINT_MAX;
+ arg = CALL_EXPR_ARG (exp, 1);
}
-
- tree attrs = DECL_ATTRIBUTES (fndecl);
- if (!attrs)
- return UINT_MAX;
-
- for (tree atfree = attrs;
- (atfree = lookup_attribute ("*dealloc", atfree));
- atfree = TREE_CHAIN (atfree))
+ /* We use __builtin_va_start (ap, 0, 0) or __builtin_next_arg (0, 0)
+ when we checked the arguments and if needed issued a warning. */
+ else
{
- tree alloc = TREE_VALUE (atfree);
- if (!alloc)
- continue;
-
- tree pos = TREE_CHAIN (alloc);
- if (!pos)
- return 0;
-
- pos = TREE_VALUE (pos);
- return TREE_INT_CST_LOW (pos) - 1;
+ if (nargs == 0)
+ {
+ /* Evidently an out of date version of <stdarg.h>; can't validate
+ va_start's second argument, but can still work as intended. */
+ warning_at (current_location,
+ OPT_Wvarargs,
+ "%<__builtin_next_arg%> called without an argument");
+ return true;
+ }
+ else if (nargs > 1)
+ {
+ error ("wrong number of arguments to function %<__builtin_next_arg%>");
+ return true;
+ }
+ arg = CALL_EXPR_ARG (exp, 0);
}
- return UINT_MAX;
-}
-
-/* Return true if DELC doesn't refer to an operator delete that's
- suitable to call with a pointer returned from the operator new
- described by NEWC. */
-
-static bool
-new_delete_mismatch_p (const demangle_component &newc,
- const demangle_component &delc)
-{
- if (newc.type != delc.type)
- return true;
+ if (TREE_CODE (arg) == SSA_NAME
+ && SSA_NAME_VAR (arg))
+ arg = SSA_NAME_VAR (arg);
- switch (newc.type)
+ /* We destructively modify the call to be __builtin_va_start (ap, 0)
+ or __builtin_next_arg (0) the first time we see it, after checking
+ the arguments and if needed issuing a warning. */
+ if (!integer_zerop (arg))
{
- case DEMANGLE_COMPONENT_NAME:
- {
- int len = newc.u.s_name.len;
- const char *news = newc.u.s_name.s;
- const char *dels = delc.u.s_name.s;
- if (len != delc.u.s_name.len || memcmp (news, dels, len))
- return true;
-
- if (news[len] == 'n')
- {
- if (news[len + 1] == 'a')
- return dels[len] != 'd' || dels[len + 1] != 'a';
- if (news[len + 1] == 'w')
- return dels[len] != 'd' || dels[len + 1] != 'l';
- }
- return false;
- }
-
- case DEMANGLE_COMPONENT_OPERATOR:
- /* Operator mismatches are handled above. */
- return false;
-
- case DEMANGLE_COMPONENT_EXTENDED_OPERATOR:
- if (newc.u.s_extended_operator.args != delc.u.s_extended_operator.args)
- return true;
- return new_delete_mismatch_p (*newc.u.s_extended_operator.name,
- *delc.u.s_extended_operator.name);
-
- case DEMANGLE_COMPONENT_FIXED_TYPE:
- if (newc.u.s_fixed.accum != delc.u.s_fixed.accum
- || newc.u.s_fixed.sat != delc.u.s_fixed.sat)
- return true;
- return new_delete_mismatch_p (*newc.u.s_fixed.length,
- *delc.u.s_fixed.length);
+ tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
- case DEMANGLE_COMPONENT_CTOR:
- if (newc.u.s_ctor.kind != delc.u.s_ctor.kind)
- return true;
- return new_delete_mismatch_p (*newc.u.s_ctor.name,
- *delc.u.s_ctor.name);
+ /* Strip off all nops for the sake of the comparison. This
+ is not quite the same as STRIP_NOPS. It does more.
+ We must also strip off INDIRECT_EXPR for C++ reference
+ parameters. */
+ while (CONVERT_EXPR_P (arg)
+ || TREE_CODE (arg) == INDIRECT_REF)
+ arg = TREE_OPERAND (arg, 0);
+ if (arg != last_parm)
+ {
+ /* FIXME: Sometimes with the tree optimizers we can get the
+ not the last argument even though the user used the last
+ argument. We just warn and set the arg to be the last
+ argument so that we will get wrong-code because of
+ it. */
+ warning_at (current_location,
+ OPT_Wvarargs,
+ "second parameter of %<va_start%> not last named argument");
+ }
- case DEMANGLE_COMPONENT_DTOR:
- if (newc.u.s_dtor.kind != delc.u.s_dtor.kind)
- return true;
- return new_delete_mismatch_p (*newc.u.s_dtor.name,
- *delc.u.s_dtor.name);
+ /* Undefined by C99 7.15.1.4p4 (va_start):
+ "If the parameter parmN is declared with the register storage
+ class, with a function or array type, or with a type that is
+ not compatible with the type that results after application of
+ the default argument promotions, the behavior is undefined."
+ */
+ else if (DECL_REGISTER (arg))
+ {
+ warning_at (current_location,
+ OPT_Wvarargs,
+ "undefined behavior when second parameter of "
+ "%<va_start%> is declared with %<register%> storage");
+ }
- case DEMANGLE_COMPONENT_BUILTIN_TYPE:
- {
- /* The demangler API provides no better way to compare built-in
- types except to by comparing their demangled names. */
- size_t nsz, dsz;
- demangle_component *pnc = const_cast<demangle_component *>(&newc);
- demangle_component *pdc = const_cast<demangle_component *>(&delc);
- char *nts = cplus_demangle_print (0, pnc, 16, &nsz);
- char *dts = cplus_demangle_print (0, pdc, 16, &dsz);
- if (!nts != !dts)
- return true;
- bool mismatch = strcmp (nts, dts);
- free (nts);
- free (dts);
- return mismatch;
- }
+ /* We want to verify the second parameter just once before the tree
+ optimizers are run and then avoid keeping it in the tree,
+ as otherwise we could warn even for correct code like:
+ void foo (int i, ...)
+ { va_list ap; i++; va_start (ap, i); va_end (ap); } */
+ if (va_start_p)
+ CALL_EXPR_ARG (exp, 1) = integer_zero_node;
+ else
+ CALL_EXPR_ARG (exp, 0) = integer_zero_node;
+ }
+ return false;
+}
- case DEMANGLE_COMPONENT_SUB_STD:
- if (newc.u.s_string.len != delc.u.s_string.len)
- return true;
- return memcmp (newc.u.s_string.string, delc.u.s_string.string,
- newc.u.s_string.len);
- case DEMANGLE_COMPONENT_FUNCTION_PARAM:
- case DEMANGLE_COMPONENT_TEMPLATE_PARAM:
- return newc.u.s_number.number != delc.u.s_number.number;
+/* Expand a call EXP to __builtin_object_size. */
- case DEMANGLE_COMPONENT_CHARACTER:
- return newc.u.s_character.character != delc.u.s_character.character;
+static rtx
+expand_builtin_object_size (tree exp)
+{
+ tree ost;
+ int object_size_type;
+ tree fndecl = get_callee_fndecl (exp);
- case DEMANGLE_COMPONENT_DEFAULT_ARG:
- case DEMANGLE_COMPONENT_LAMBDA:
- if (newc.u.s_unary_num.num != delc.u.s_unary_num.num)
- return true;
- return new_delete_mismatch_p (*newc.u.s_unary_num.sub,
- *delc.u.s_unary_num.sub);
- default:
- break;
+ if (!validate_arglist (exp, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ {
+ error ("first argument of %qD must be a pointer, second integer constant",
+ fndecl);
+ expand_builtin_trap ();
+ return const0_rtx;
}
- if (!newc.u.s_binary.left != !delc.u.s_binary.left)
- return true;
+ ost = CALL_EXPR_ARG (exp, 1);
+ STRIP_NOPS (ost);
- if (!newc.u.s_binary.left)
- return false;
+ if (TREE_CODE (ost) != INTEGER_CST
+ || tree_int_cst_sgn (ost) < 0
+ || compare_tree_int (ost, 3) > 0)
+ {
+ error ("last argument of %qD is not integer constant between 0 and 3",
+ fndecl);
+ expand_builtin_trap ();
+ return const0_rtx;
+ }
- if (new_delete_mismatch_p (*newc.u.s_binary.left, *delc.u.s_binary.left)
- || !newc.u.s_binary.right != !delc.u.s_binary.right)
- return true;
+ object_size_type = tree_to_shwi (ost);
- if (newc.u.s_binary.right)
- return new_delete_mismatch_p (*newc.u.s_binary.right,
- *delc.u.s_binary.right);
- return false;
+ return object_size_type < 2 ? constm1_rtx : const0_rtx;
}
-/* Return true if DELETE_DECL is an operator delete that's not suitable
- to call with a pointer returned fron NEW_DECL. */
+/* Expand EXP, a call to the __mem{cpy,pcpy,move,set}_chk builtin.
+ FCODE is the BUILT_IN_* to use.
+ Return NULL_RTX if we failed; the caller should emit a normal call,
+ otherwise try to get the result in TARGET, if convenient (and in
+ mode MODE if that's convenient). */
-static bool
-new_delete_mismatch_p (tree new_decl, tree delete_decl)
+static rtx
+expand_builtin_memory_chk (tree exp, rtx target, machine_mode mode,
+ enum built_in_function fcode)
{
- tree new_name = DECL_ASSEMBLER_NAME (new_decl);
- tree delete_name = DECL_ASSEMBLER_NAME (delete_decl);
-
- /* valid_new_delete_pair_p() returns a conservative result (currently
- it only handles global operators). A true result is reliable but
- a false result doesn't necessarily mean the operators don't match. */
- if (valid_new_delete_pair_p (new_name, delete_name))
- return false;
-
- /* For anything not handled by valid_new_delete_pair_p() such as member
- operators compare the individual demangled components of the mangled
- name. */
- const char *new_str = IDENTIFIER_POINTER (new_name);
- const char *del_str = IDENTIFIER_POINTER (delete_name);
+ if (!validate_arglist (exp,
+ POINTER_TYPE,
+ fcode == BUILT_IN_MEMSET_CHK
+ ? INTEGER_TYPE : POINTER_TYPE,
+ INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
+ return NULL_RTX;
- void *np = NULL, *dp = NULL;
- demangle_component *ndc = cplus_demangle_v3_components (new_str, 0, &np);
- demangle_component *ddc = cplus_demangle_v3_components (del_str, 0, &dp);
- bool mismatch = new_delete_mismatch_p (*ndc, *ddc);
- free (np);
- free (dp);
- return mismatch;
-}
+ tree dest = CALL_EXPR_ARG (exp, 0);
+ tree src = CALL_EXPR_ARG (exp, 1);
+ tree len = CALL_EXPR_ARG (exp, 2);
+ tree size = CALL_EXPR_ARG (exp, 3);
-/* ALLOC_DECL and DEALLOC_DECL are pair of allocation and deallocation
- functions. Return true if the latter is suitable to deallocate objects
- allocated by calls to the former. */
+ /* FIXME: Set access mode to write only for memset et al. */
+ bool sizes_ok = check_access (exp, len, /*maxread=*/NULL_TREE,
+ /*srcstr=*/NULL_TREE, size, access_read_write);
-static bool
-matching_alloc_calls_p (tree alloc_decl, tree dealloc_decl)
-{
- /* Set to alloc_kind_t::builtin if ALLOC_DECL is associated with
- a built-in deallocator. */
- enum class alloc_kind_t { none, builtin, user }
- alloc_dealloc_kind = alloc_kind_t::none;
+ if (!tree_fits_uhwi_p (size))
+ return NULL_RTX;
- if (DECL_IS_OPERATOR_NEW_P (alloc_decl))
+ if (tree_fits_uhwi_p (len) || integer_all_onesp (size))
{
- if (DECL_IS_OPERATOR_DELETE_P (dealloc_decl))
- /* Return true iff both functions are of the same array or
- singleton form and false otherwise. */
- return !new_delete_mismatch_p (alloc_decl, dealloc_decl);
+ /* Avoid transforming the checking call to an ordinary one when
+ an overflow has been detected or when the call couldn't be
+ validated because the size is not constant. */
+ if (!sizes_ok && !integer_all_onesp (size) && tree_int_cst_lt (size, len))
+ return NULL_RTX;
- /* Return false for deallocation functions that are known not
- to match. */
- if (fndecl_built_in_p (dealloc_decl, BUILT_IN_FREE)
- || fndecl_built_in_p (dealloc_decl, BUILT_IN_REALLOC))
- return false;
- /* Otherwise proceed below to check the deallocation function's
- "*dealloc" attributes to look for one that mentions this operator
- new. */
- }
- else if (fndecl_built_in_p (alloc_decl, BUILT_IN_NORMAL))
- {
- switch (DECL_FUNCTION_CODE (alloc_decl))
+ tree fn = NULL_TREE;
+ /* If __builtin_mem{cpy,pcpy,move,set}_chk is used, assume
+ mem{cpy,pcpy,move,set} is available. */
+ switch (fcode)
{
- case BUILT_IN_ALLOCA:
- case BUILT_IN_ALLOCA_WITH_ALIGN:
- return false;
-
- case BUILT_IN_ALIGNED_ALLOC:
- case BUILT_IN_CALLOC:
- case BUILT_IN_GOMP_ALLOC:
- case BUILT_IN_MALLOC:
- case BUILT_IN_REALLOC:
- case BUILT_IN_STRDUP:
- case BUILT_IN_STRNDUP:
- if (DECL_IS_OPERATOR_DELETE_P (dealloc_decl))
- return false;
-
- if (fndecl_built_in_p (dealloc_decl, BUILT_IN_FREE)
- || fndecl_built_in_p (dealloc_decl, BUILT_IN_REALLOC))
- return true;
-
- alloc_dealloc_kind = alloc_kind_t::builtin;
+ case BUILT_IN_MEMCPY_CHK:
+ fn = builtin_decl_explicit (BUILT_IN_MEMCPY);
+ break;
+ case BUILT_IN_MEMPCPY_CHK:
+ fn = builtin_decl_explicit (BUILT_IN_MEMPCPY);
+ break;
+ case BUILT_IN_MEMMOVE_CHK:
+ fn = builtin_decl_explicit (BUILT_IN_MEMMOVE);
+ break;
+ case BUILT_IN_MEMSET_CHK:
+ fn = builtin_decl_explicit (BUILT_IN_MEMSET);
break;
-
default:
break;
}
- }
-
- /* Set if DEALLOC_DECL both allocates and deallocates. */
- alloc_kind_t realloc_kind = alloc_kind_t::none;
-
- if (fndecl_built_in_p (dealloc_decl, BUILT_IN_NORMAL))
- {
- built_in_function dealloc_code = DECL_FUNCTION_CODE (dealloc_decl);
- if (dealloc_code == BUILT_IN_REALLOC)
- realloc_kind = alloc_kind_t::builtin;
-
- for (tree amats = DECL_ATTRIBUTES (alloc_decl);
- (amats = lookup_attribute ("malloc", amats));
- amats = TREE_CHAIN (amats))
- {
- tree args = TREE_VALUE (amats);
- if (!args)
- continue;
- tree fndecl = TREE_VALUE (args);
- if (!fndecl || !DECL_P (fndecl))
- continue;
+ if (! fn)
+ return NULL_RTX;
- if (fndecl_built_in_p (fndecl, BUILT_IN_NORMAL)
- && dealloc_code == DECL_FUNCTION_CODE (fndecl))
- return true;
- }
+ fn = build_call_nofold_loc (EXPR_LOCATION (exp), fn, 3, dest, src, len);
+ gcc_assert (TREE_CODE (fn) == CALL_EXPR);
+ CALL_EXPR_TAILCALL (fn) = CALL_EXPR_TAILCALL (exp);
+ return expand_expr (fn, target, mode, EXPAND_NORMAL);
}
-
- const bool alloc_builtin = fndecl_built_in_p (alloc_decl, BUILT_IN_NORMAL);
- alloc_kind_t realloc_dealloc_kind = alloc_kind_t::none;
-
- /* If DEALLOC_DECL has an internal "*dealloc" attribute scan the list
- of its associated allocation functions for ALLOC_DECL.
- If the corresponding ALLOC_DECL is found they're a matching pair,
- otherwise they're not.
- With DDATS set to the Deallocator's *Dealloc ATtributes... */
- for (tree ddats = DECL_ATTRIBUTES (dealloc_decl);
- (ddats = lookup_attribute ("*dealloc", ddats));
- ddats = TREE_CHAIN (ddats))
+ else if (fcode == BUILT_IN_MEMSET_CHK)
+ return NULL_RTX;
+ else
{
- tree args = TREE_VALUE (ddats);
- if (!args)
- continue;
-
- tree alloc = TREE_VALUE (args);
- if (!alloc)
- continue;
+ unsigned int dest_align = get_pointer_alignment (dest);
- if (alloc == DECL_NAME (dealloc_decl))
- realloc_kind = alloc_kind_t::user;
+ /* If DEST is not a pointer type, call the normal function. */
+ if (dest_align == 0)
+ return NULL_RTX;
- if (DECL_P (alloc))
+ /* If SRC and DEST are the same (and not volatile), do nothing. */
+ if (operand_equal_p (src, dest, 0))
{
- gcc_checking_assert (fndecl_built_in_p (alloc, BUILT_IN_NORMAL));
+ tree expr;
- switch (DECL_FUNCTION_CODE (alloc))
+ if (fcode != BUILT_IN_MEMPCPY_CHK)
{
- case BUILT_IN_ALIGNED_ALLOC:
- case BUILT_IN_CALLOC:
- case BUILT_IN_GOMP_ALLOC:
- case BUILT_IN_MALLOC:
- case BUILT_IN_REALLOC:
- case BUILT_IN_STRDUP:
- case BUILT_IN_STRNDUP:
- realloc_dealloc_kind = alloc_kind_t::builtin;
- break;
- default:
- break;
+ /* Evaluate and ignore LEN in case it has side-effects. */
+ expand_expr (len, const0_rtx, VOIDmode, EXPAND_NORMAL);
+ return expand_expr (dest, target, mode, EXPAND_NORMAL);
}
- if (!alloc_builtin)
- continue;
-
- if (DECL_FUNCTION_CODE (alloc) != DECL_FUNCTION_CODE (alloc_decl))
- continue;
-
- return true;
+ expr = fold_build_pointer_plus (dest, len);
+ return expand_expr (expr, target, mode, EXPAND_NORMAL);
}
- if (alloc == DECL_NAME (alloc_decl))
- return true;
- }
-
- if (realloc_kind == alloc_kind_t::none)
- return false;
+ /* __memmove_chk special case. */
+ if (fcode == BUILT_IN_MEMMOVE_CHK)
+ {
+ unsigned int src_align = get_pointer_alignment (src);
- hash_set<tree> common_deallocs;
- /* Special handling for deallocators. Iterate over both the allocator's
- and the reallocator's associated deallocator functions looking for
- the first one in common. If one is found, the de/reallocator is
- a match for the allocator even though the latter isn't directly
- associated with the former. This simplifies declarations in system
- headers.
- With AMATS set to the Allocator's Malloc ATtributes,
- and RMATS set to Reallocator's Malloc ATtributes... */
- for (tree amats = DECL_ATTRIBUTES (alloc_decl),
- rmats = DECL_ATTRIBUTES (dealloc_decl);
- (amats = lookup_attribute ("malloc", amats))
- || (rmats = lookup_attribute ("malloc", rmats));
- amats = amats ? TREE_CHAIN (amats) : NULL_TREE,
- rmats = rmats ? TREE_CHAIN (rmats) : NULL_TREE)
- {
- if (tree args = amats ? TREE_VALUE (amats) : NULL_TREE)
- if (tree adealloc = TREE_VALUE (args))
- {
- if (DECL_P (adealloc)
- && fndecl_built_in_p (adealloc, BUILT_IN_NORMAL))
- {
- built_in_function fncode = DECL_FUNCTION_CODE (adealloc);
- if (fncode == BUILT_IN_FREE || fncode == BUILT_IN_REALLOC)
- {
- if (realloc_kind == alloc_kind_t::builtin)
- return true;
- alloc_dealloc_kind = alloc_kind_t::builtin;
- }
- continue;
- }
-
- common_deallocs.add (adealloc);
- }
+ if (src_align == 0)
+ return NULL_RTX;
- if (tree args = rmats ? TREE_VALUE (rmats) : NULL_TREE)
- if (tree ddealloc = TREE_VALUE (args))
- {
- if (DECL_P (ddealloc)
- && fndecl_built_in_p (ddealloc, BUILT_IN_NORMAL))
- {
- built_in_function fncode = DECL_FUNCTION_CODE (ddealloc);
- if (fncode == BUILT_IN_FREE || fncode == BUILT_IN_REALLOC)
- {
- if (alloc_dealloc_kind == alloc_kind_t::builtin)
- return true;
- realloc_dealloc_kind = alloc_kind_t::builtin;
- }
- continue;
- }
-
- if (common_deallocs.add (ddealloc))
- return true;
- }
+ /* If src is categorized for a readonly section we can use
+ normal __memcpy_chk. */
+ if (readonly_data_expr (src))
+ {
+ tree fn = builtin_decl_explicit (BUILT_IN_MEMCPY_CHK);
+ if (!fn)
+ return NULL_RTX;
+ fn = build_call_nofold_loc (EXPR_LOCATION (exp), fn, 4,
+ dest, src, len, size);
+ gcc_assert (TREE_CODE (fn) == CALL_EXPR);
+ CALL_EXPR_TAILCALL (fn) = CALL_EXPR_TAILCALL (exp);
+ return expand_expr (fn, target, mode, EXPAND_NORMAL);
+ }
+ }
+ return NULL_RTX;
}
-
- /* Succeed only if ALLOC_DECL and the reallocator DEALLOC_DECL share
- a built-in deallocator. */
- return (alloc_dealloc_kind == alloc_kind_t::builtin
- && realloc_dealloc_kind == alloc_kind_t::builtin);
}
-/* Return true if DEALLOC_DECL is a function suitable to deallocate
- objectes allocated by the ALLOC call. */
+/* Emit warning if a buffer overflow is detected at compile time. */
-static bool
-matching_alloc_calls_p (gimple *alloc, tree dealloc_decl)
+static void
+maybe_emit_chk_warning (tree exp, enum built_in_function fcode)
{
- tree alloc_decl = gimple_call_fndecl (alloc);
- if (!alloc_decl)
- return true;
-
- return matching_alloc_calls_p (alloc_decl, dealloc_decl);
-}
+ /* The source string. */
+ tree srcstr = NULL_TREE;
+ /* The size of the destination object returned by __builtin_object_size. */
+ tree objsize = NULL_TREE;
+ /* The string that is being concatenated with (as in __strcat_chk)
+ or null if it isn't. */
+ tree catstr = NULL_TREE;
+ /* The maximum length of the source sequence in a bounded operation
+ (such as __strncat_chk) or null if the operation isn't bounded
+ (such as __strcat_chk). */
+ tree maxread = NULL_TREE;
+ /* The exact size of the access (such as in __strncpy_chk). */
+ tree size = NULL_TREE;
+ /* The access by the function that's checked. Except for snprintf
+ both writing and reading is checked. */
+ access_mode mode = access_read_write;
-/* Diagnose a call EXP to deallocate a pointer referenced by AREF if it
- includes a nonzero offset. Such a pointer cannot refer to the beginning
- of an allocated object. A negative offset may refer to it only if
- the target pointer is unknown. */
+ switch (fcode)
+ {
+ case BUILT_IN_STRCPY_CHK:
+ case BUILT_IN_STPCPY_CHK:
+ srcstr = CALL_EXPR_ARG (exp, 1);
+ objsize = CALL_EXPR_ARG (exp, 2);
+ break;
-static bool
-warn_dealloc_offset (location_t loc, tree exp, const access_ref &aref)
-{
- if (aref.deref || aref.offrng[0] <= 0 || aref.offrng[1] <= 0)
- return false;
+ case BUILT_IN_STRCAT_CHK:
+ /* For __strcat_chk the warning will be emitted only if overflowing
+ by at least strlen (dest) + 1 bytes. */
+ catstr = CALL_EXPR_ARG (exp, 0);
+ srcstr = CALL_EXPR_ARG (exp, 1);
+ objsize = CALL_EXPR_ARG (exp, 2);
+ break;
- tree dealloc_decl = get_callee_fndecl (exp);
- if (!dealloc_decl)
- return false;
+ case BUILT_IN_STRNCAT_CHK:
+ catstr = CALL_EXPR_ARG (exp, 0);
+ srcstr = CALL_EXPR_ARG (exp, 1);
+ maxread = CALL_EXPR_ARG (exp, 2);
+ objsize = CALL_EXPR_ARG (exp, 3);
+ break;
- if (DECL_IS_OPERATOR_DELETE_P (dealloc_decl)
- && !DECL_IS_REPLACEABLE_OPERATOR (dealloc_decl))
- {
- /* A call to a user-defined operator delete with a pointer plus offset
- may be valid if it's returned from an unknown function (i.e., one
- that's not operator new). */
- if (TREE_CODE (aref.ref) == SSA_NAME)
- {
- gimple *def_stmt = SSA_NAME_DEF_STMT (aref.ref);
- if (is_gimple_call (def_stmt))
- {
- tree alloc_decl = gimple_call_fndecl (def_stmt);
- if (!alloc_decl || !DECL_IS_OPERATOR_NEW_P (alloc_decl))
- return false;
- }
- }
- }
+ case BUILT_IN_STRNCPY_CHK:
+ case BUILT_IN_STPNCPY_CHK:
+ srcstr = CALL_EXPR_ARG (exp, 1);
+ size = CALL_EXPR_ARG (exp, 2);
+ objsize = CALL_EXPR_ARG (exp, 3);
+ break;
- char offstr[80];
- offstr[0] = '\0';
- if (wi::fits_shwi_p (aref.offrng[0]))
- {
- if (aref.offrng[0] == aref.offrng[1]
- || !wi::fits_shwi_p (aref.offrng[1]))
- sprintf (offstr, " %lli",
- (long long)aref.offrng[0].to_shwi ());
- else
- sprintf (offstr, " [%lli, %lli]",
- (long long)aref.offrng[0].to_shwi (),
- (long long)aref.offrng[1].to_shwi ());
+ case BUILT_IN_SNPRINTF_CHK:
+ case BUILT_IN_VSNPRINTF_CHK:
+ maxread = CALL_EXPR_ARG (exp, 1);
+ objsize = CALL_EXPR_ARG (exp, 3);
+ /* The only checked access the write to the destination. */
+ mode = access_write_only;
+ break;
+ default:
+ gcc_unreachable ();
}
- if (!warning_at (loc, OPT_Wfree_nonheap_object,
- "%qD called on pointer %qE with nonzero offset%s",
- dealloc_decl, aref.ref, offstr))
- return false;
-
- if (DECL_P (aref.ref))
- inform (DECL_SOURCE_LOCATION (aref.ref), "declared here");
- else if (TREE_CODE (aref.ref) == SSA_NAME)
+ if (catstr && maxread)
{
- gimple *def_stmt = SSA_NAME_DEF_STMT (aref.ref);
- if (is_gimple_call (def_stmt))
- {
- location_t def_loc = gimple_location (def_stmt);
- tree alloc_decl = gimple_call_fndecl (def_stmt);
- if (alloc_decl)
- inform (def_loc,
- "returned from %qD", alloc_decl);
- else if (tree alloc_fntype = gimple_call_fntype (def_stmt))
- inform (def_loc,
- "returned from %qT", alloc_fntype);
- else
- inform (def_loc, "obtained here");
- }
+ /* Check __strncat_chk. There is no way to determine the length
+ of the string to which the source string is being appended so
+ just warn when the length of the source string is not known. */
+ check_strncat_sizes (exp, objsize);
+ return;
}
- return true;
+ check_access (exp, size, maxread, srcstr, objsize, mode);
}
-/* Issue a warning if a deallocation function such as free, realloc,
- or C++ operator delete is called with an argument not returned by
- a matching allocation function such as malloc or the corresponding
- form of C++ operatorn new. */
+/* Emit warning if a buffer overflow is detected at compile time
+ in __sprintf_chk/__vsprintf_chk calls. */
-void
-maybe_emit_free_warning (tree exp)
+static void
+maybe_emit_sprintf_chk_warning (tree exp, enum built_in_function fcode)
{
- tree fndecl = get_callee_fndecl (exp);
- if (!fndecl)
- return;
+ tree size, len, fmt;
+ const char *fmt_str;
+ int nargs = call_expr_nargs (exp);
- unsigned argno = call_dealloc_argno (exp);
- if ((unsigned) call_expr_nargs (exp) <= argno)
- return;
+ /* Verify the required arguments in the original call. */
- tree ptr = CALL_EXPR_ARG (exp, argno);
- if (integer_zerop (ptr))
+ if (nargs < 4)
return;
+ size = CALL_EXPR_ARG (exp, 2);
+ fmt = CALL_EXPR_ARG (exp, 3);
- access_ref aref;
- if (!compute_objsize (ptr, 0, &aref))
+ if (! tree_fits_uhwi_p (size) || integer_all_onesp (size))
return;
- tree ref = aref.ref;
- if (integer_zerop (ref))
+ /* Check whether the format is a literal string constant. */
+ fmt_str = c_getstr (fmt);
+ if (fmt_str == NULL)
return;
- tree dealloc_decl = get_callee_fndecl (exp);
- location_t loc = EXPR_LOCATION (exp);
+ if (!init_target_chars ())
+ return;
- if (DECL_P (ref) || EXPR_P (ref))
+ /* If the format doesn't contain % args or %%, we know its size. */
+ if (strchr (fmt_str, target_percent) == 0)
+ len = build_int_cstu (size_type_node, strlen (fmt_str));
+ /* If the format is "%s" and first ... argument is a string literal,
+ we know it too. */
+ else if (fcode == BUILT_IN_SPRINTF_CHK
+ && strcmp (fmt_str, target_percent_s) == 0)
{
- /* Diagnose freeing a declared object. */
- if (aref.ref_declared ()
- && warning_at (loc, OPT_Wfree_nonheap_object,
- "%qD called on unallocated object %qD",
- dealloc_decl, ref))
- {
- loc = (DECL_P (ref)
- ? DECL_SOURCE_LOCATION (ref)
- : EXPR_LOCATION (ref));
- inform (loc, "declared here");
- return;
- }
+ tree arg;
- /* Diagnose freeing a pointer that includes a positive offset.
- Such a pointer cannot refer to the beginning of an allocated
- object. A negative offset may refer to it. */
- if (aref.sizrng[0] != aref.sizrng[1]
- && warn_dealloc_offset (loc, exp, aref))
+ if (nargs < 5)
+ return;
+ arg = CALL_EXPR_ARG (exp, 4);
+ if (! POINTER_TYPE_P (TREE_TYPE (arg)))
+ return;
+
+ len = c_strlen (arg, 1);
+ if (!len || ! tree_fits_uhwi_p (len))
return;
}
- else if (CONSTANT_CLASS_P (ref))
- {
- if (warning_at (loc, OPT_Wfree_nonheap_object,
- "%qD called on a pointer to an unallocated "
- "object %qE", dealloc_decl, ref))
- {
- if (TREE_CODE (ptr) == SSA_NAME)
- {
- gimple *def_stmt = SSA_NAME_DEF_STMT (ptr);
- if (is_gimple_assign (def_stmt))
- {
- location_t loc = gimple_location (def_stmt);
- inform (loc, "assigned here");
- }
- }
- return;
- }
- }
- else if (TREE_CODE (ref) == SSA_NAME)
- {
- /* Also warn if the pointer argument refers to the result
- of an allocation call like alloca or VLA. */
- gimple *def_stmt = SSA_NAME_DEF_STMT (ref);
- if (is_gimple_call (def_stmt))
- {
- bool warned = false;
- if (gimple_call_alloc_p (def_stmt))
- {
- if (matching_alloc_calls_p (def_stmt, dealloc_decl))
- {
- if (warn_dealloc_offset (loc, exp, aref))
- return;
- }
- else
- {
- tree alloc_decl = gimple_call_fndecl (def_stmt);
- const opt_code opt =
- (DECL_IS_OPERATOR_NEW_P (alloc_decl)
- || DECL_IS_OPERATOR_DELETE_P (dealloc_decl)
- ? OPT_Wmismatched_new_delete
- : OPT_Wmismatched_dealloc);
- warned = warning_at (loc, opt,
- "%qD called on pointer returned "
- "from a mismatched allocation "
- "function", dealloc_decl);
- }
- }
- else if (gimple_call_builtin_p (def_stmt, BUILT_IN_ALLOCA)
- || gimple_call_builtin_p (def_stmt,
- BUILT_IN_ALLOCA_WITH_ALIGN))
- warned = warning_at (loc, OPT_Wfree_nonheap_object,
- "%qD called on pointer to "
- "an unallocated object",
- dealloc_decl);
- else if (warn_dealloc_offset (loc, exp, aref))
- return;
-
- if (warned)
- {
- tree fndecl = gimple_call_fndecl (def_stmt);
- inform (gimple_location (def_stmt),
- "returned from %qD", fndecl);
- return;
- }
- }
- else if (gimple_nop_p (def_stmt))
- {
- ref = SSA_NAME_VAR (ref);
- /* Diagnose freeing a pointer that includes a positive offset. */
- if (TREE_CODE (ref) == PARM_DECL
- && !aref.deref
- && aref.sizrng[0] != aref.sizrng[1]
- && aref.offrng[0] > 0 && aref.offrng[1] > 0
- && warn_dealloc_offset (loc, exp, aref))
- return;
- }
- }
+ else
+ return;
+
+ /* Add one for the terminating nul. */
+ len = fold_build2 (PLUS_EXPR, TREE_TYPE (len), len, size_one_node);
+
+ check_access (exp, /*size=*/NULL_TREE, /*maxread=*/NULL_TREE, len, size,
+ access_write_only);
}
/* Fold a call to __builtin_object_size with arguments PTR and OST,
projects / thirdparty / gcc.git / commitdiff
