/* Pass computing data for optimizing stdarg functions.
- Copyright (C) 2004-2013 Free Software Foundation, Inc.
+ Copyright (C) 2004-2020 Free Software Foundation, Inc.
Contributed by Jakub Jelinek <jakub@redhat.com>
This file is part of GCC.
#include "config.h"
#include "system.h"
#include "coretypes.h"
-#include "tm.h"
-#include "tree.h"
-#include "function.h"
-#include "langhooks.h"
-#include "gimple-pretty-print.h"
+#include "backend.h"
#include "target.h"
-#include "tree-flow.h"
+#include "tree.h"
+#include "gimple.h"
#include "tree-pass.h"
+#include "ssa.h"
+#include "gimple-pretty-print.h"
+#include "fold-const.h"
+#include "langhooks.h"
+#include "gimple-iterator.h"
+#include "gimple-walk.h"
+#include "gimplify.h"
+#include "tree-into-ssa.h"
+#include "tree-cfg.h"
#include "tree-stdarg.h"
/* A simple pass that attempts to optimize stdarg functions on architectures
static bool
reachable_at_most_once (basic_block va_arg_bb, basic_block va_start_bb)
{
- vec<edge> stack = vNULL;
+ auto_vec<edge, 10> stack;
edge e;
edge_iterator ei;
- sbitmap visited;
bool ret;
if (va_arg_bb == va_start_bb)
if (! dominated_by_p (CDI_DOMINATORS, va_arg_bb, va_start_bb))
return false;
- visited = sbitmap_alloc (last_basic_block);
+ auto_sbitmap visited (last_basic_block_for_fn (cfun));
bitmap_clear (visited);
ret = true;
break;
}
- gcc_assert (src != ENTRY_BLOCK_PTR);
+ gcc_assert (src != ENTRY_BLOCK_PTR_FOR_FN (cfun));
if (! bitmap_bit_p (visited, src->index))
{
}
}
- stack.release ();
- sbitmap_free (visited);
return ret;
}
bool gpr_p)
{
tree lhs, orig_lhs;
- gimple stmt;
+ gimple *stmt;
unsigned HOST_WIDE_INT ret = 0, val, counter_val;
unsigned int max_size;
if ((rhs_code == POINTER_PLUS_EXPR
|| rhs_code == PLUS_EXPR)
&& TREE_CODE (rhs1) == SSA_NAME
- && host_integerp (gimple_assign_rhs2 (stmt), 1))
+ && tree_fits_uhwi_p (gimple_assign_rhs2 (stmt)))
{
- ret += tree_low_cst (gimple_assign_rhs2 (stmt), 1);
+ ret += tree_to_uhwi (gimple_assign_rhs2 (stmt));
lhs = rhs1;
continue;
}
if (rhs_code == ADDR_EXPR
&& TREE_CODE (TREE_OPERAND (rhs1, 0)) == MEM_REF
&& TREE_CODE (TREE_OPERAND (TREE_OPERAND (rhs1, 0), 0)) == SSA_NAME
- && host_integerp (TREE_OPERAND (TREE_OPERAND (rhs1, 0), 1), 1))
+ && tree_fits_uhwi_p (TREE_OPERAND (TREE_OPERAND (rhs1, 0), 1)))
{
- ret += tree_low_cst (TREE_OPERAND (TREE_OPERAND (rhs1, 0), 1), 1);
+ ret += tree_to_uhwi (TREE_OPERAND (TREE_OPERAND (rhs1, 0), 1));
lhs = TREE_OPERAND (TREE_OPERAND (rhs1, 0), 0);
continue;
}
if ((rhs_code == POINTER_PLUS_EXPR
|| rhs_code == PLUS_EXPR)
&& TREE_CODE (rhs1) == SSA_NAME
- && host_integerp (gimple_assign_rhs2 (stmt), 1))
+ && tree_fits_uhwi_p (gimple_assign_rhs2 (stmt)))
{
- val -= tree_low_cst (gimple_assign_rhs2 (stmt), 1);
+ val -= tree_to_uhwi (gimple_assign_rhs2 (stmt));
lhs = rhs1;
continue;
}
if (rhs_code == ADDR_EXPR
&& TREE_CODE (TREE_OPERAND (rhs1, 0)) == MEM_REF
&& TREE_CODE (TREE_OPERAND (TREE_OPERAND (rhs1, 0), 0)) == SSA_NAME
- && host_integerp (TREE_OPERAND (TREE_OPERAND (rhs1, 0), 1), 1))
+ && tree_fits_uhwi_p (TREE_OPERAND (TREE_OPERAND (rhs1, 0), 1)))
{
- val -= tree_low_cst (TREE_OPERAND (TREE_OPERAND (rhs1, 0), 1), 1);
+ val -= tree_to_uhwi (TREE_OPERAND (TREE_OPERAND (rhs1, 0), 1));
lhs = TREE_OPERAND (TREE_OPERAND (rhs1, 0), 0);
continue;
}
if (bitmap_bit_p (va_list_vars, SSA_NAME_VERSION (var)))
return var;
}
- else if (TREE_CODE (var) == VAR_DECL)
+ else if (VAR_P (var))
{
if (bitmap_bit_p (va_list_vars, DECL_UID (var) + num_ssa_names))
return var;
return false;
base = get_base_address (ap);
- if (TREE_CODE (base) != VAR_DECL
+ if (!VAR_P (base)
|| !bitmap_bit_p (si->va_list_vars, DECL_UID (base) + num_ssa_names))
return false;
static bool
va_list_ptr_read (struct stdarg_info *si, tree ap, tree tem)
{
- if (TREE_CODE (ap) != VAR_DECL
+ if (!VAR_P (ap)
|| !bitmap_bit_p (si->va_list_vars, DECL_UID (ap) + num_ssa_names))
return false;
{
unsigned HOST_WIDE_INT increment;
- if (TREE_CODE (ap) != VAR_DECL
+ if (!VAR_P (ap)
|| !bitmap_bit_p (si->va_list_vars, DECL_UID (ap) + num_ssa_names))
return false;
{
basic_block bb;
- FOR_EACH_BB (bb)
+ FOR_EACH_BB_FN (bb, cfun)
{
- gimple_stmt_iterator i;
-
- for (i = gsi_start_phis (bb); !gsi_end_p (i); gsi_next (&i))
+ for (gphi_iterator i = gsi_start_phis (bb); !gsi_end_p (i);
+ gsi_next (&i))
{
tree lhs;
use_operand_p uop;
ssa_op_iter soi;
- gimple phi = gsi_stmt (i);
+ gphi *phi = i.phi ();
lhs = PHI_RESULT (phi);
if (virtual_operand_p (lhs)
}
}
- for (i = gsi_start_bb (bb); !gsi_end_p (i); gsi_next (&i))
+ for (gimple_stmt_iterator i = gsi_start_bb (bb); !gsi_end_p (i);
+ gsi_next (&i))
{
- gimple stmt = gsi_stmt (i);
+ gimple *stmt = gsi_stmt (i);
tree use;
ssa_op_iter iter;
if (rhs_code == MEM_REF
&& TREE_OPERAND (rhs, 0) == use
&& TYPE_SIZE_UNIT (TREE_TYPE (rhs))
- && host_integerp (TYPE_SIZE_UNIT (TREE_TYPE (rhs)), 1)
+ && tree_fits_uhwi_p (TYPE_SIZE_UNIT (TREE_TYPE (rhs)))
&& si->offsets[SSA_NAME_VERSION (use)] != -1)
{
unsigned HOST_WIDE_INT gpr_size;
tree access_size = TYPE_SIZE_UNIT (TREE_TYPE (rhs));
gpr_size = si->offsets[SSA_NAME_VERSION (use)]
- + tree_low_cst (TREE_OPERAND (rhs, 1), 0)
- + tree_low_cst (access_size, 1);
+ + tree_to_shwi (TREE_OPERAND (rhs, 1))
+ + tree_to_uhwi (access_size);
if (gpr_size >= VA_LIST_MAX_GPR_SIZE)
cfun->va_list_gpr_size = VA_LIST_MAX_GPR_SIZE;
else if (gpr_size > cfun->va_list_gpr_size)
SSA_NAME_VERSION (lhs)))
continue;
- if (TREE_CODE (lhs) == VAR_DECL
+ if (VAR_P (lhs)
&& bitmap_bit_p (si->va_list_vars,
DECL_UID (lhs) + num_ssa_names))
continue;
return false;
}
+/* Optimize FUN->va_list_gpr_size and FUN->va_list_fpr_size. */
-/* Return true if this optimization pass should be done.
- It makes only sense for stdarg functions. */
-
-static bool
-gate_optimize_stdarg (void)
-{
- /* This optimization is only for stdarg functions. */
- return cfun->stdarg != 0;
-}
-
-
-/* Entry point to the stdarg optimization pass. */
-
-static unsigned int
-execute_optimize_stdarg (void)
+static void
+optimize_va_list_gpr_fpr_size (function *fun)
{
basic_block bb;
bool va_list_escapes = false;
const char *funcname = NULL;
tree cfun_va_list;
- cfun->va_list_gpr_size = 0;
- cfun->va_list_fpr_size = 0;
+ fun->va_list_gpr_size = 0;
+ fun->va_list_fpr_size = 0;
memset (&si, 0, sizeof (si));
si.va_list_vars = BITMAP_ALLOC (NULL);
si.va_list_escape_vars = BITMAP_ALLOC (NULL);
if (dump_file)
funcname = lang_hooks.decl_printable_name (current_function_decl, 2);
- cfun_va_list = targetm.fn_abi_va_list (cfun->decl);
+ cfun_va_list = targetm.fn_abi_va_list (fun->decl);
va_list_simple_ptr = POINTER_TYPE_P (cfun_va_list)
&& (TREE_TYPE (cfun_va_list) == void_type_node
|| TREE_TYPE (cfun_va_list) == char_type_node);
gcc_assert (is_gimple_reg_type (cfun_va_list) == va_list_simple_ptr);
- FOR_EACH_BB (bb)
+ FOR_EACH_BB_FN (bb, fun)
{
gimple_stmt_iterator i;
for (i = gsi_start_bb (bb); !gsi_end_p (i); gsi_next (&i))
{
- gimple stmt = gsi_stmt (i);
+ gimple *stmt = gsi_stmt (i);
tree callee, ap;
if (!is_gimple_call (stmt))
callee = gimple_call_fndecl (stmt);
if (!callee
- || DECL_BUILT_IN_CLASS (callee) != BUILT_IN_NORMAL)
+ || !fndecl_built_in_p (callee, BUILT_IN_NORMAL))
continue;
switch (DECL_FUNCTION_CODE (callee))
ap = TREE_OPERAND (ap, 0);
}
if (TYPE_MAIN_VARIANT (TREE_TYPE (ap))
- != TYPE_MAIN_VARIANT (targetm.fn_abi_va_list (cfun->decl))
- || TREE_CODE (ap) != VAR_DECL)
+ != TYPE_MAIN_VARIANT (targetm.fn_abi_va_list (fun->decl))
+ || !VAR_P (ap))
{
va_list_escapes = true;
break;
/* For void * or char * va_list there is just one counter
(va_list itself). Use VA_LIST_GPR_SIZE for it. */
if (va_list_simple_ptr)
- cfun->va_list_fpr_size = VA_LIST_MAX_FPR_SIZE;
+ fun->va_list_fpr_size = VA_LIST_MAX_FPR_SIZE;
calculate_dominance_info (CDI_DOMINATORS);
memset (&wi, 0, sizeof (wi));
wi.info = si.va_list_vars;
- FOR_EACH_BB (bb)
+ FOR_EACH_BB_FN (bb, fun)
{
- gimple_stmt_iterator i;
-
si.compute_sizes = -1;
si.bb = bb;
/* For va_list_simple_ptr, we have to check PHI nodes too. We treat
them as assignments for the purpose of escape analysis. This is
not needed for non-simple va_list because virtual phis don't perform
- any real data movement. */
- if (va_list_simple_ptr)
- {
- tree lhs, rhs;
- use_operand_p uop;
- ssa_op_iter soi;
+ any real data movement. Also, check PHI nodes for taking address of
+ the va_list vars. */
+ tree lhs, rhs;
+ use_operand_p uop;
+ ssa_op_iter soi;
- for (i = gsi_start_phis (bb); !gsi_end_p (i); gsi_next (&i))
- {
- gimple phi = gsi_stmt (i);
- lhs = PHI_RESULT (phi);
+ for (gphi_iterator i = gsi_start_phis (bb); !gsi_end_p (i);
+ gsi_next (&i))
+ {
+ gphi *phi = i.phi ();
+ lhs = PHI_RESULT (phi);
- if (virtual_operand_p (lhs))
- continue;
+ if (virtual_operand_p (lhs))
+ continue;
+ if (va_list_simple_ptr)
+ {
FOR_EACH_PHI_ARG (uop, phi, soi, SSA_OP_USE)
{
rhs = USE_FROM_PTR (uop);
}
}
}
+
+ for (unsigned j = 0; !va_list_escapes
+ && j < gimple_phi_num_args (phi); ++j)
+ if ((!va_list_simple_ptr
+ || TREE_CODE (gimple_phi_arg_def (phi, j)) != SSA_NAME)
+ && walk_tree (gimple_phi_arg_def_ptr (phi, j),
+ find_va_list_reference, &wi, NULL))
+ {
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ {
+ fputs ("va_list escapes in ", dump_file);
+ print_gimple_stmt (dump_file, phi, 0, dump_flags);
+ fputc ('\n', dump_file);
+ }
+ va_list_escapes = true;
+ }
}
- for (i = gsi_start_bb (bb);
+ for (gimple_stmt_iterator i = gsi_start_bb (bb);
!gsi_end_p (i) && !va_list_escapes;
gsi_next (&i))
{
- gimple stmt = gsi_stmt (i);
+ gimple *stmt = gsi_stmt (i);
/* Don't look at __builtin_va_{start,end}, they are ok. */
if (is_gimple_call (stmt))
tree callee = gimple_call_fndecl (stmt);
if (callee
- && DECL_BUILT_IN_CLASS (callee) == BUILT_IN_NORMAL
- && (DECL_FUNCTION_CODE (callee) == BUILT_IN_VA_START
- || DECL_FUNCTION_CODE (callee) == BUILT_IN_VA_END))
+ && (fndecl_built_in_p (callee, BUILT_IN_VA_START)
+ || fndecl_built_in_p (callee, BUILT_IN_VA_END)))
continue;
}
if (is_gimple_assign (stmt))
{
- tree lhs = gimple_assign_lhs (stmt);
- tree rhs = gimple_assign_rhs1 (stmt);
+ lhs = gimple_assign_lhs (stmt);
+ rhs = gimple_assign_rhs1 (stmt);
if (va_list_simple_ptr)
{
finish:
if (va_list_escapes)
{
- cfun->va_list_gpr_size = VA_LIST_MAX_GPR_SIZE;
- cfun->va_list_fpr_size = VA_LIST_MAX_FPR_SIZE;
+ fun->va_list_gpr_size = VA_LIST_MAX_GPR_SIZE;
+ fun->va_list_fpr_size = VA_LIST_MAX_FPR_SIZE;
}
BITMAP_FREE (si.va_list_vars);
BITMAP_FREE (si.va_list_escape_vars);
{
fprintf (dump_file, "%s: va_list escapes %d, needs to save ",
funcname, (int) va_list_escapes);
- if (cfun->va_list_gpr_size >= VA_LIST_MAX_GPR_SIZE)
+ if (fun->va_list_gpr_size >= VA_LIST_MAX_GPR_SIZE)
fputs ("all", dump_file);
else
fprintf (dump_file, "%d", cfun->va_list_gpr_size);
fputs (" GPR units and ", dump_file);
- if (cfun->va_list_fpr_size >= VA_LIST_MAX_FPR_SIZE)
+ if (fun->va_list_fpr_size >= VA_LIST_MAX_FPR_SIZE)
fputs ("all", dump_file);
else
fprintf (dump_file, "%d", cfun->va_list_fpr_size);
fputs (" FPR units.\n", dump_file);
}
- return 0;
}
+/* Expand IFN_VA_ARGs in FUN. */
+
+static void
+expand_ifn_va_arg_1 (function *fun)
+{
+ bool modified = false;
+ basic_block bb;
+ gimple_stmt_iterator i;
+ location_t saved_location;
+
+ FOR_EACH_BB_FN (bb, fun)
+ for (i = gsi_start_bb (bb); !gsi_end_p (i); gsi_next (&i))
+ {
+ gimple *stmt = gsi_stmt (i);
+ tree ap, aptype, expr, lhs, type;
+ gimple_seq pre = NULL, post = NULL;
+
+ if (!gimple_call_internal_p (stmt, IFN_VA_ARG))
+ continue;
+
+ modified = true;
+
+ type = TREE_TYPE (TREE_TYPE (gimple_call_arg (stmt, 1)));
+ ap = gimple_call_arg (stmt, 0);
+ aptype = TREE_TYPE (gimple_call_arg (stmt, 2));
+ gcc_assert (POINTER_TYPE_P (aptype));
+
+ /* Balanced out the &ap, usually added by build_va_arg. */
+ ap = build2 (MEM_REF, TREE_TYPE (aptype), ap,
+ build_int_cst (aptype, 0));
+
+ push_gimplify_context (false);
+ saved_location = input_location;
+ input_location = gimple_location (stmt);
+
+ /* Make it easier for the backends by protecting the valist argument
+ from multiple evaluations. */
+ gimplify_expr (&ap, &pre, &post, is_gimple_min_lval, fb_lvalue);
+
+ expr = targetm.gimplify_va_arg_expr (ap, type, &pre, &post);
+
+ lhs = gimple_call_lhs (stmt);
+ if (lhs != NULL_TREE)
+ {
+ unsigned int nargs = gimple_call_num_args (stmt);
+ gcc_assert (useless_type_conversion_p (TREE_TYPE (lhs), type));
+
+ if (nargs == 4)
+ {
+ /* We've transported the size of with WITH_SIZE_EXPR here as
+ the last argument of the internal fn call. Now reinstate
+ it. */
+ tree size = gimple_call_arg (stmt, nargs - 1);
+ expr = build2 (WITH_SIZE_EXPR, TREE_TYPE (expr), expr, size);
+ }
+
+ /* We use gimplify_assign here, rather than gimple_build_assign,
+ because gimple_assign knows how to deal with variable-sized
+ types. */
+ gimplify_assign (lhs, expr, &pre);
+ }
+ else
+ gimplify_and_add (expr, &pre);
+
+ input_location = saved_location;
+ pop_gimplify_context (NULL);
+
+ gimple_seq_add_seq (&pre, post);
+ update_modified_stmts (pre);
+
+ /* Add the sequence after IFN_VA_ARG. This splits the bb right
+ after IFN_VA_ARG, and adds the sequence in one or more new bbs
+ inbetween. */
+ gimple_find_sub_bbs (pre, &i);
+
+ /* Remove the IFN_VA_ARG gimple_call. It's the last stmt in the
+ bb. */
+ unlink_stmt_vdef (stmt);
+ release_ssa_name_fn (fun, gimple_vdef (stmt));
+ gsi_remove (&i, true);
+ gcc_assert (gsi_end_p (i));
+
+ /* We're walking here into the bbs which contain the expansion of
+ IFN_VA_ARG, and will not contain another IFN_VA_ARG that needs
+ expanding. We could try to skip walking these bbs, perhaps by
+ walking backwards over gimples and bbs. */
+ break;
+ }
+
+ if (!modified)
+ return;
+
+ free_dominance_info (CDI_DOMINATORS);
+ update_ssa (TODO_update_ssa);
+}
+
+/* Expand IFN_VA_ARGs in FUN, if necessary. */
+
+static void
+expand_ifn_va_arg (function *fun)
+{
+ if ((fun->curr_properties & PROP_gimple_lva) == 0)
+ expand_ifn_va_arg_1 (fun);
+
+ if (flag_checking)
+ {
+ basic_block bb;
+ gimple_stmt_iterator i;
+ FOR_EACH_BB_FN (bb, fun)
+ for (i = gsi_start_bb (bb); !gsi_end_p (i); gsi_next (&i))
+ gcc_assert (!gimple_call_internal_p (gsi_stmt (i), IFN_VA_ARG));
+ }
+}
namespace {
GIMPLE_PASS, /* type */
"stdarg", /* name */
OPTGROUP_NONE, /* optinfo_flags */
- true, /* has_gate */
- true, /* has_execute */
TV_NONE, /* tv_id */
( PROP_cfg | PROP_ssa ), /* properties_required */
- 0, /* properties_provided */
+ PROP_gimple_lva, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
0, /* todo_flags_finish */
class pass_stdarg : public gimple_opt_pass
{
public:
- pass_stdarg(gcc::context *ctxt)
- : gimple_opt_pass(pass_data_stdarg, ctxt)
+ pass_stdarg (gcc::context *ctxt)
+ : gimple_opt_pass (pass_data_stdarg, ctxt)
{}
/* opt_pass methods: */
- bool gate () { return gate_optimize_stdarg (); }
- unsigned int execute () { return execute_optimize_stdarg (); }
+ virtual bool gate (function *)
+ {
+ /* Always run this pass, in order to expand va_arg internal_fns. We
+ also need to do that if fun->stdarg == 0, because a va_arg may also
+ occur in a function without varargs, f.i. if when passing a va_list to
+ another function. */
+ return true;
+ }
+
+ virtual unsigned int execute (function *);
}; // class pass_stdarg
+unsigned int
+pass_stdarg::execute (function *fun)
+{
+ /* TODO: Postpone expand_ifn_va_arg till after
+ optimize_va_list_gpr_fpr_size. */
+ expand_ifn_va_arg (fun);
+
+ if (flag_stdarg_opt
+ /* This optimization is only for stdarg functions. */
+ && fun->stdarg != 0)
+ optimize_va_list_gpr_fpr_size (fun);
+
+ return 0;
+}
+
} // anon namespace
gimple_opt_pass *
{
return new pass_stdarg (ctxt);
}
+
+namespace {
+
+const pass_data pass_data_lower_vaarg =
+{
+ GIMPLE_PASS, /* type */
+ "lower_vaarg", /* name */
+ OPTGROUP_NONE, /* optinfo_flags */
+ TV_NONE, /* tv_id */
+ ( PROP_cfg | PROP_ssa ), /* properties_required */
+ PROP_gimple_lva, /* properties_provided */
+ 0, /* properties_destroyed */
+ 0, /* todo_flags_start */
+ 0, /* todo_flags_finish */
+};
+
+class pass_lower_vaarg : public gimple_opt_pass
+{
+public:
+ pass_lower_vaarg (gcc::context *ctxt)
+ : gimple_opt_pass (pass_data_lower_vaarg, ctxt)
+ {}
+
+ /* opt_pass methods: */
+ virtual bool gate (function *)
+ {
+ return (cfun->curr_properties & PROP_gimple_lva) == 0;
+ }
+
+ virtual unsigned int execute (function *);
+
+}; // class pass_lower_vaarg
+
+unsigned int
+pass_lower_vaarg::execute (function *fun)
+{
+ expand_ifn_va_arg (fun);
+ return 0;
+}
+
+} // anon namespace
+
+gimple_opt_pass *
+make_pass_lower_vaarg (gcc::context *ctxt)
+{
+ return new pass_lower_vaarg (ctxt);
+}
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