/* Parse expressions for GDB.
- Copyright (C) 1986-2019 Free Software Foundation, Inc.
+ Copyright (C) 1986-2023 Free Software Foundation, Inc.
Modified from expread.y by the Department of Computer Science at the
State University of New York at Buffalo, 1991.
#include "value.h"
#include "command.h"
#include "language.h"
-#include "f-lang.h"
#include "parser-defs.h"
#include "gdbcmd.h"
-#include "symfile.h" /* for overlay functions */
+#include "symfile.h"
#include "inferior.h"
#include "target-float.h"
#include "block.h"
#include "objfiles.h"
#include "user-regs.h"
#include <algorithm>
-#include "common/gdb_optional.h"
-
-/* Standard set of definitions for printing, dumping, prefixifying,
- * and evaluating expressions. */
-
-const struct exp_descriptor exp_descriptor_standard =
- {
- print_subexp_standard,
- operator_length_standard,
- operator_check_standard,
- op_name_standard,
- dump_subexp_body_standard,
- evaluate_subexp_standard
- };
-\f
+#include <optional>
+#include "c-exp.h"
+
static unsigned int expressiondebug = 0;
static void
show_expressiondebug (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
- fprintf_filtered (file, _("Expression debugging is %s.\n"), value);
+ gdb_printf (file, _("Expression debugging is %s.\n"), value);
}
-/* Non-zero if an expression parser should set yydebug. */
-int parser_debug;
+/* True if an expression parser should set yydebug. */
+static bool parser_debug;
static void
show_parserdebug (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
- fprintf_filtered (file, _("Parser debugging is %s.\n"), value);
+ gdb_printf (file, _("Parser debugging is %s.\n"), value);
}
-static int prefixify_subexp (struct expression *, struct expression *, int,
- int, int);
-
-static expression_up parse_exp_in_context (const char **, CORE_ADDR,
- const struct block *, int,
- int, int *,
- innermost_block_tracker *,
- expr_completion_state *);
-
-static void increase_expout_size (struct expr_builder *ps, size_t lenelt);
-
-
/* Documented at it's declaration. */
void
{
if ((m_types & t) != 0
&& (m_innermost_block == NULL
- || contained_in (b, m_innermost_block)))
+ || m_innermost_block->contains (b)))
m_innermost_block = b;
}
\f
-/* See definition in parser-defs.h. */
-
-expr_builder::expr_builder (const struct language_defn *lang,
- struct gdbarch *gdbarch)
- : expout_size (10),
- expout (XNEWVAR (expression,
- (sizeof (expression)
- + EXP_ELEM_TO_BYTES (expout_size)))),
- expout_ptr (0)
-{
- expout->language_defn = lang;
- expout->gdbarch = gdbarch;
-}
-
-expression_up
-expr_builder::release ()
-{
- /* Record the actual number of expression elements, and then
- reallocate the expression memory so that we free up any
- excess elements. */
-
- expout->nelts = expout_ptr;
- expout.reset (XRESIZEVAR (expression, expout.release (),
- (sizeof (expression)
- + EXP_ELEM_TO_BYTES (expout_ptr))));
-
- return std::move (expout);
-}
-
-/* This page contains the functions for adding data to the struct expression
- being constructed. */
-
-/* Add one element to the end of the expression. */
-
-/* To avoid a bug in the Sun 4 compiler, we pass things that can fit into
- a register through here. */
-
-static void
-write_exp_elt (struct expr_builder *ps, const union exp_element *expelt)
-{
- if (ps->expout_ptr >= ps->expout_size)
- {
- ps->expout_size *= 2;
- ps->expout.reset (XRESIZEVAR (expression, ps->expout.release (),
- (sizeof (expression)
- + EXP_ELEM_TO_BYTES (ps->expout_size))));
- }
- ps->expout->elts[ps->expout_ptr++] = *expelt;
-}
-
-void
-write_exp_elt_opcode (struct expr_builder *ps, enum exp_opcode expelt)
-{
- union exp_element tmp;
-
- memset (&tmp, 0, sizeof (union exp_element));
- tmp.opcode = expelt;
- write_exp_elt (ps, &tmp);
-}
-
-void
-write_exp_elt_sym (struct expr_builder *ps, struct symbol *expelt)
-{
- union exp_element tmp;
-
- memset (&tmp, 0, sizeof (union exp_element));
- tmp.symbol = expelt;
- write_exp_elt (ps, &tmp);
-}
-
-void
-write_exp_elt_msym (struct expr_builder *ps, minimal_symbol *expelt)
+bool
+expr_complete_tag::complete (struct expression *exp,
+ completion_tracker &tracker)
{
- union exp_element tmp;
-
- memset (&tmp, 0, sizeof (union exp_element));
- tmp.msymbol = expelt;
- write_exp_elt (ps, &tmp);
+ collect_symbol_completion_matches_type (tracker, m_name.get (),
+ m_name.get (), m_code);
+ return true;
}
-void
-write_exp_elt_block (struct expr_builder *ps, const struct block *b)
-{
- union exp_element tmp;
-
- memset (&tmp, 0, sizeof (union exp_element));
- tmp.block = b;
- write_exp_elt (ps, &tmp);
-}
+/* See parser-defs.h. */
void
-write_exp_elt_objfile (struct expr_builder *ps, struct objfile *objfile)
+parser_state::mark_struct_expression (expr::structop_base_operation *op)
{
- union exp_element tmp;
-
- memset (&tmp, 0, sizeof (union exp_element));
- tmp.objfile = objfile;
- write_exp_elt (ps, &tmp);
+ gdb_assert (parse_completion && m_completion_state == nullptr);
+ m_completion_state.reset (new expr_complete_structop (op));
}
-void
-write_exp_elt_longcst (struct expr_builder *ps, LONGEST expelt)
-{
- union exp_element tmp;
-
- memset (&tmp, 0, sizeof (union exp_element));
- tmp.longconst = expelt;
- write_exp_elt (ps, &tmp);
-}
+/* Indicate that the current parser invocation is completing a tag.
+ TAG is the type code of the tag, and PTR and LENGTH represent the
+ start of the tag name. */
void
-write_exp_elt_floatcst (struct expr_builder *ps, const gdb_byte expelt[16])
+parser_state::mark_completion_tag (enum type_code tag, const char *ptr,
+ int length)
{
- union exp_element tmp;
- int index;
-
- for (index = 0; index < 16; index++)
- tmp.floatconst[index] = expelt[index];
-
- write_exp_elt (ps, &tmp);
+ gdb_assert (parse_completion && m_completion_state == nullptr);
+ gdb_assert (tag == TYPE_CODE_UNION
+ || tag == TYPE_CODE_STRUCT
+ || tag == TYPE_CODE_ENUM);
+ m_completion_state.reset
+ (new expr_complete_tag (tag, make_unique_xstrndup (ptr, length)));
}
-void
-write_exp_elt_type (struct expr_builder *ps, struct type *expelt)
-{
- union exp_element tmp;
-
- memset (&tmp, 0, sizeof (union exp_element));
- tmp.type = expelt;
- write_exp_elt (ps, &tmp);
-}
+/* See parser-defs.h. */
void
-write_exp_elt_intern (struct expr_builder *ps, struct internalvar *expelt)
+parser_state::push_c_string (int kind, struct stoken_vector *vec)
{
- union exp_element tmp;
-
- memset (&tmp, 0, sizeof (union exp_element));
- tmp.internalvar = expelt;
- write_exp_elt (ps, &tmp);
-}
+ std::vector<std::string> data (vec->len);
+ for (int i = 0; i < vec->len; ++i)
+ data[i] = std::string (vec->tokens[i].ptr, vec->tokens[i].length);
-/* Add a string constant to the end of the expression.
-
- String constants are stored by first writing an expression element
- that contains the length of the string, then stuffing the string
- constant itself into however many expression elements are needed
- to hold it, and then writing another expression element that contains
- the length of the string. I.e. an expression element at each end of
- the string records the string length, so you can skip over the
- expression elements containing the actual string bytes from either
- end of the string. Note that this also allows gdb to handle
- strings with embedded null bytes, as is required for some languages.
-
- Don't be fooled by the fact that the string is null byte terminated,
- this is strictly for the convenience of debugging gdb itself.
- Gdb does not depend up the string being null terminated, since the
- actual length is recorded in expression elements at each end of the
- string. The null byte is taken into consideration when computing how
- many expression elements are required to hold the string constant, of
- course. */
-
-
-void
-write_exp_string (struct expr_builder *ps, struct stoken str)
-{
- int len = str.length;
- size_t lenelt;
- char *strdata;
-
- /* Compute the number of expression elements required to hold the string
- (including a null byte terminator), along with one expression element
- at each end to record the actual string length (not including the
- null byte terminator). */
-
- lenelt = 2 + BYTES_TO_EXP_ELEM (len + 1);
-
- increase_expout_size (ps, lenelt);
-
- /* Write the leading length expression element (which advances the current
- expression element index), then write the string constant followed by a
- terminating null byte, and then write the trailing length expression
- element. */
-
- write_exp_elt_longcst (ps, (LONGEST) len);
- strdata = (char *) &ps->expout->elts[ps->expout_ptr];
- memcpy (strdata, str.ptr, len);
- *(strdata + len) = '\0';
- ps->expout_ptr += lenelt - 2;
- write_exp_elt_longcst (ps, (LONGEST) len);
+ push_new<expr::c_string_operation> ((enum c_string_type_values) kind,
+ std::move (data));
}
-/* Add a vector of string constants to the end of the expression.
-
- This adds an OP_STRING operation, but encodes the contents
- differently from write_exp_string. The language is expected to
- handle evaluation of this expression itself.
-
- After the usual OP_STRING header, TYPE is written into the
- expression as a long constant. The interpretation of this field is
- up to the language evaluator.
-
- Next, each string in VEC is written. The length is written as a
- long constant, followed by the contents of the string. */
+/* See parser-defs.h. */
void
-write_exp_string_vector (struct expr_builder *ps, int type,
- struct stoken_vector *vec)
+parser_state::push_symbol (const char *name, block_symbol sym)
{
- int i, len;
- size_t n_slots;
-
- /* Compute the size. We compute the size in number of slots to
- avoid issues with string padding. */
- n_slots = 0;
- for (i = 0; i < vec->len; ++i)
- {
- /* One slot for the length of this element, plus the number of
- slots needed for this string. */
- n_slots += 1 + BYTES_TO_EXP_ELEM (vec->tokens[i].length);
- }
-
- /* One more slot for the type of the string. */
- ++n_slots;
-
- /* Now compute a phony string length. */
- len = EXP_ELEM_TO_BYTES (n_slots) - 1;
-
- n_slots += 4;
- increase_expout_size (ps, n_slots);
-
- write_exp_elt_opcode (ps, OP_STRING);
- write_exp_elt_longcst (ps, len);
- write_exp_elt_longcst (ps, type);
-
- for (i = 0; i < vec->len; ++i)
+ if (sym.symbol != nullptr)
{
- write_exp_elt_longcst (ps, vec->tokens[i].length);
- memcpy (&ps->expout->elts[ps->expout_ptr], vec->tokens[i].ptr,
- vec->tokens[i].length);
- ps->expout_ptr += BYTES_TO_EXP_ELEM (vec->tokens[i].length);
- }
-
- write_exp_elt_longcst (ps, len);
- write_exp_elt_opcode (ps, OP_STRING);
-}
-
-/* Add a bitstring constant to the end of the expression.
-
- Bitstring constants are stored by first writing an expression element
- that contains the length of the bitstring (in bits), then stuffing the
- bitstring constant itself into however many expression elements are
- needed to hold it, and then writing another expression element that
- contains the length of the bitstring. I.e. an expression element at
- each end of the bitstring records the bitstring length, so you can skip
- over the expression elements containing the actual bitstring bytes from
- either end of the bitstring. */
-
-void
-write_exp_bitstring (struct expr_builder *ps, struct stoken str)
-{
- int bits = str.length; /* length in bits */
- int len = (bits + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT;
- size_t lenelt;
- char *strdata;
-
- /* Compute the number of expression elements required to hold the bitstring,
- along with one expression element at each end to record the actual
- bitstring length in bits. */
-
- lenelt = 2 + BYTES_TO_EXP_ELEM (len);
-
- increase_expout_size (ps, lenelt);
-
- /* Write the leading length expression element (which advances the current
- expression element index), then write the bitstring constant, and then
- write the trailing length expression element. */
-
- write_exp_elt_longcst (ps, (LONGEST) bits);
- strdata = (char *) &ps->expout->elts[ps->expout_ptr];
- memcpy (strdata, str.ptr, len);
- ps->expout_ptr += lenelt - 2;
- write_exp_elt_longcst (ps, (LONGEST) bits);
-}
-
-/* Return the type of MSYMBOL, a minimal symbol of OBJFILE. If
- ADDRESS_P is not NULL, set it to the MSYMBOL's resolved
- address. */
-
-type *
-find_minsym_type_and_address (minimal_symbol *msymbol,
- struct objfile *objfile,
- CORE_ADDR *address_p)
-{
- bound_minimal_symbol bound_msym = {msymbol, objfile};
- struct obj_section *section = MSYMBOL_OBJ_SECTION (objfile, msymbol);
- enum minimal_symbol_type type = MSYMBOL_TYPE (msymbol);
-
- bool is_tls = (section != NULL
- && section->the_bfd_section->flags & SEC_THREAD_LOCAL);
-
- /* The minimal symbol might point to a function descriptor;
- resolve it to the actual code address instead. */
- CORE_ADDR addr;
- if (is_tls)
- {
- /* Addresses of TLS symbols are really offsets into a
- per-objfile/per-thread storage block. */
- addr = MSYMBOL_VALUE_RAW_ADDRESS (bound_msym.minsym);
- }
- else if (msymbol_is_function (objfile, msymbol, &addr))
- {
- if (addr != BMSYMBOL_VALUE_ADDRESS (bound_msym))
- {
- /* This means we resolved a function descriptor, and we now
- have an address for a code/text symbol instead of a data
- symbol. */
- if (MSYMBOL_TYPE (msymbol) == mst_data_gnu_ifunc)
- type = mst_text_gnu_ifunc;
- else
- type = mst_text;
- section = NULL;
- }
+ if (symbol_read_needs_frame (sym.symbol))
+ block_tracker->update (sym);
+ push_new<expr::var_value_operation> (sym);
}
else
- addr = BMSYMBOL_VALUE_ADDRESS (bound_msym);
-
- if (overlay_debugging)
- addr = symbol_overlayed_address (addr, section);
-
- if (is_tls)
{
- /* Skip translation if caller does not need the address. */
- if (address_p != NULL)
- *address_p = target_translate_tls_address (objfile, addr);
- return objfile_type (objfile)->nodebug_tls_symbol;
+ struct bound_minimal_symbol msymbol = lookup_bound_minimal_symbol (name);
+ if (msymbol.minsym != NULL)
+ push_new<expr::var_msym_value_operation> (msymbol);
+ else if (!have_full_symbols () && !have_partial_symbols ())
+ error (_("No symbol table is loaded. Use the \"file\" command."));
+ else
+ error (_("No symbol \"%s\" in current context."), name);
}
-
- if (address_p != NULL)
- *address_p = addr;
-
- switch (type)
- {
- case mst_text:
- case mst_file_text:
- case mst_solib_trampoline:
- return objfile_type (objfile)->nodebug_text_symbol;
-
- case mst_text_gnu_ifunc:
- return objfile_type (objfile)->nodebug_text_gnu_ifunc_symbol;
-
- case mst_data:
- case mst_file_data:
- case mst_bss:
- case mst_file_bss:
- return objfile_type (objfile)->nodebug_data_symbol;
-
- case mst_slot_got_plt:
- return objfile_type (objfile)->nodebug_got_plt_symbol;
-
- default:
- return objfile_type (objfile)->nodebug_unknown_symbol;
- }
-}
-
-/* Add the appropriate elements for a minimal symbol to the end of
- the expression. */
-
-void
-write_exp_msymbol (struct expr_builder *ps,
- struct bound_minimal_symbol bound_msym)
-{
- write_exp_elt_opcode (ps, OP_VAR_MSYM_VALUE);
- write_exp_elt_objfile (ps, bound_msym.objfile);
- write_exp_elt_msym (ps, bound_msym.minsym);
- write_exp_elt_opcode (ps, OP_VAR_MSYM_VALUE);
}
/* See parser-defs.h. */
void
-parser_state::mark_struct_expression ()
-{
- gdb_assert (parse_completion
- && (m_completion_state.expout_tag_completion_type
- == TYPE_CODE_UNDEF));
- m_completion_state.expout_last_struct = expout_ptr;
-}
-
-/* Indicate that the current parser invocation is completing a tag.
- TAG is the type code of the tag, and PTR and LENGTH represent the
- start of the tag name. */
-
-void
-parser_state::mark_completion_tag (enum type_code tag, const char *ptr,
- int length)
-{
- gdb_assert (parse_completion
- && (m_completion_state.expout_tag_completion_type
- == TYPE_CODE_UNDEF)
- && m_completion_state.expout_completion_name == NULL
- && m_completion_state.expout_last_struct == -1);
- gdb_assert (tag == TYPE_CODE_UNION
- || tag == TYPE_CODE_STRUCT
- || tag == TYPE_CODE_ENUM);
- m_completion_state.expout_tag_completion_type = tag;
- m_completion_state.expout_completion_name.reset (xstrndup (ptr, length));
-}
-
-\f
-/* Recognize tokens that start with '$'. These include:
-
- $regname A native register name or a "standard
- register name".
-
- $variable A convenience variable with a name chosen
- by the user.
-
- $digits Value history with index <digits>, starting
- from the first value which has index 1.
-
- $$digits Value history with index <digits> relative
- to the last value. I.e. $$0 is the last
- value, $$1 is the one previous to that, $$2
- is the one previous to $$1, etc.
-
- $ | $0 | $$0 The last value in the value history.
-
- $$ An abbreviation for the second to the last
- value in the value history, I.e. $$1 */
-
-void
-write_dollar_variable (struct parser_state *ps, struct stoken str)
+parser_state::push_dollar (struct stoken str)
{
struct block_symbol sym;
struct bound_minimal_symbol msym;
struct internalvar *isym = NULL;
+ std::string copy;
/* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1)
and $$digits (equivalent to $<-digits> if you could type that). */
{
/* Just dollars (one or two). */
i = -negate;
- goto handle_last;
+ push_new<expr::last_operation> (i);
+ return;
}
/* Is the rest of the token digits? */
for (; i < str.length; i++)
i = atoi (str.ptr + 1 + negate);
if (negate)
i = -i;
- goto handle_last;
+ push_new<expr::last_operation> (i);
+ return;
}
/* Handle tokens that refer to machine registers:
$ followed by a register name. */
- i = user_reg_map_name_to_regnum (ps->gdbarch (),
+ i = user_reg_map_name_to_regnum (gdbarch (),
str.ptr + 1, str.length - 1);
if (i >= 0)
- goto handle_register;
+ {
+ str.length--;
+ str.ptr++;
+ push_new<expr::register_operation> (copy_name (str));
+ block_tracker->update (expression_context_block,
+ INNERMOST_BLOCK_FOR_REGISTERS);
+ return;
+ }
/* Any names starting with $ are probably debugger internal variables. */
- isym = lookup_only_internalvar (copy_name (str) + 1);
+ copy = copy_name (str);
+ isym = lookup_only_internalvar (copy.c_str () + 1);
if (isym)
{
- write_exp_elt_opcode (ps, OP_INTERNALVAR);
- write_exp_elt_intern (ps, isym);
- write_exp_elt_opcode (ps, OP_INTERNALVAR);
+ push_new<expr::internalvar_operation> (isym);
return;
}
- /* On some systems, such as HP-UX and hppa-linux, certain system routines
+ /* On some systems, such as HP-UX and hppa-linux, certain system routines
have names beginning with $ or $$. Check for those, first. */
- sym = lookup_symbol (copy_name (str), NULL, VAR_DOMAIN, NULL);
+ sym = lookup_symbol (copy.c_str (), NULL, VAR_DOMAIN, NULL);
if (sym.symbol)
{
- write_exp_elt_opcode (ps, OP_VAR_VALUE);
- write_exp_elt_block (ps, sym.block);
- write_exp_elt_sym (ps, sym.symbol);
- write_exp_elt_opcode (ps, OP_VAR_VALUE);
+ push_new<expr::var_value_operation> (sym);
return;
}
- msym = lookup_bound_minimal_symbol (copy_name (str));
+ msym = lookup_bound_minimal_symbol (copy.c_str ());
if (msym.minsym)
{
- write_exp_msymbol (ps, msym);
+ push_new<expr::var_msym_value_operation> (msym);
return;
}
/* Any other names are assumed to be debugger internal variables. */
- write_exp_elt_opcode (ps, OP_INTERNALVAR);
- write_exp_elt_intern (ps, create_internalvar (copy_name (str) + 1));
- write_exp_elt_opcode (ps, OP_INTERNALVAR);
- return;
-handle_last:
- write_exp_elt_opcode (ps, OP_LAST);
- write_exp_elt_longcst (ps, (LONGEST) i);
- write_exp_elt_opcode (ps, OP_LAST);
- return;
-handle_register:
- write_exp_elt_opcode (ps, OP_REGISTER);
- str.length--;
- str.ptr++;
- write_exp_string (ps, str);
- write_exp_elt_opcode (ps, OP_REGISTER);
- ps->block_tracker->update (ps->expression_context_block,
- INNERMOST_BLOCK_FOR_REGISTERS);
- return;
+ push_new<expr::internalvar_operation>
+ (create_internalvar (copy.c_str () + 1));
}
+\f
const char *
find_template_name_end (const char *p)
so they can share the storage that lexptr is parsing.
When it is necessary to pass a name to a function that expects
a null-terminated string, the substring is copied out
- into a separate block of storage.
-
- N.B. A single buffer is reused on each call. */
+ into a separate block of storage. */
-char *
+std::string
copy_name (struct stoken token)
{
- /* A temporary buffer for identifiers, so we can null-terminate them.
- We allocate this with xrealloc. parse_exp_1 used to allocate with
- alloca, using the size of the whole expression as a conservative
- estimate of the space needed. However, macro expansion can
- introduce names longer than the original expression; there's no
- practical way to know beforehand how large that might be. */
- static char *namecopy;
- static size_t namecopy_size;
-
- /* Make sure there's enough space for the token. */
- if (namecopy_size < token.length + 1)
- {
- namecopy_size = token.length + 1;
- namecopy = (char *) xrealloc (namecopy, token.length + 1);
- }
-
- memcpy (namecopy, token.ptr, token.length);
- namecopy[token.length] = 0;
-
- return namecopy;
+ return std::string (token.ptr, token.length);
}
\f
-/* See comments on parser-defs.h. */
-
-int
-prefixify_expression (struct expression *expr, int last_struct)
-{
- gdb_assert (expr->nelts > 0);
- int len = sizeof (struct expression) + EXP_ELEM_TO_BYTES (expr->nelts);
- struct expression *temp;
- int inpos = expr->nelts, outpos = 0;
-
- temp = (struct expression *) alloca (len);
-
- /* Copy the original expression into temp. */
- memcpy (temp, expr, len);
-
- return prefixify_subexp (temp, expr, inpos, outpos, last_struct);
-}
-
-/* Return the number of exp_elements in the postfix subexpression
- of EXPR whose operator is at index ENDPOS - 1 in EXPR. */
-
-static int
-length_of_subexp (struct expression *expr, int endpos)
-{
- int oplen, args;
-
- operator_length (expr, endpos, &oplen, &args);
-
- while (args > 0)
- {
- oplen += length_of_subexp (expr, endpos - oplen);
- args--;
- }
-
- return oplen;
-}
-
-/* Sets *OPLENP to the length of the operator whose (last) index is
- ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that
- operator takes. */
-
-void
-operator_length (const struct expression *expr, int endpos, int *oplenp,
- int *argsp)
-{
- expr->language_defn->la_exp_desc->operator_length (expr, endpos,
- oplenp, argsp);
-}
-
-/* Default value for operator_length in exp_descriptor vectors. */
-
-void
-operator_length_standard (const struct expression *expr, int endpos,
- int *oplenp, int *argsp)
-{
- int oplen = 1;
- int args = 0;
- enum range_type range_type;
- int i;
-
- if (endpos < 1)
- error (_("?error in operator_length_standard"));
-
- i = (int) expr->elts[endpos - 1].opcode;
-
- switch (i)
- {
- /* C++ */
- case OP_SCOPE:
- oplen = longest_to_int (expr->elts[endpos - 2].longconst);
- oplen = 5 + BYTES_TO_EXP_ELEM (oplen + 1);
- break;
-
- case OP_LONG:
- case OP_FLOAT:
- case OP_VAR_VALUE:
- case OP_VAR_MSYM_VALUE:
- oplen = 4;
- break;
-
- case OP_FUNC_STATIC_VAR:
- oplen = longest_to_int (expr->elts[endpos - 2].longconst);
- oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1);
- args = 1;
- break;
-
- case OP_TYPE:
- case OP_BOOL:
- case OP_LAST:
- case OP_INTERNALVAR:
- case OP_VAR_ENTRY_VALUE:
- oplen = 3;
- break;
-
- case OP_COMPLEX:
- oplen = 3;
- args = 2;
- break;
-
- case OP_FUNCALL:
- case OP_F77_UNDETERMINED_ARGLIST:
- oplen = 3;
- args = 1 + longest_to_int (expr->elts[endpos - 2].longconst);
- break;
-
- case TYPE_INSTANCE:
- oplen = 5 + longest_to_int (expr->elts[endpos - 2].longconst);
- args = 1;
- break;
-
- case OP_OBJC_MSGCALL: /* Objective C message (method) call. */
- oplen = 4;
- args = 1 + longest_to_int (expr->elts[endpos - 2].longconst);
- break;
-
- case UNOP_MAX:
- case UNOP_MIN:
- oplen = 3;
- break;
-
- case UNOP_CAST_TYPE:
- case UNOP_DYNAMIC_CAST:
- case UNOP_REINTERPRET_CAST:
- case UNOP_MEMVAL_TYPE:
- oplen = 1;
- args = 2;
- break;
-
- case BINOP_VAL:
- case UNOP_CAST:
- case UNOP_MEMVAL:
- oplen = 3;
- args = 1;
- break;
-
- case UNOP_ABS:
- case UNOP_CAP:
- case UNOP_CHR:
- case UNOP_FLOAT:
- case UNOP_HIGH:
- case UNOP_KIND:
- case UNOP_ODD:
- case UNOP_ORD:
- case UNOP_TRUNC:
- case OP_TYPEOF:
- case OP_DECLTYPE:
- case OP_TYPEID:
- oplen = 1;
- args = 1;
- break;
-
- case OP_ADL_FUNC:
- oplen = longest_to_int (expr->elts[endpos - 2].longconst);
- oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1);
- oplen++;
- oplen++;
- break;
-
- case STRUCTOP_STRUCT:
- case STRUCTOP_PTR:
- args = 1;
- /* fall through */
- case OP_REGISTER:
- case OP_M2_STRING:
- case OP_STRING:
- case OP_OBJC_NSSTRING: /* Objective C Foundation Class
- NSString constant. */
- case OP_OBJC_SELECTOR: /* Objective C "@selector" pseudo-op. */
- case OP_NAME:
- oplen = longest_to_int (expr->elts[endpos - 2].longconst);
- oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1);
- break;
-
- case OP_ARRAY:
- oplen = 4;
- args = longest_to_int (expr->elts[endpos - 2].longconst);
- args -= longest_to_int (expr->elts[endpos - 3].longconst);
- args += 1;
- break;
-
- case TERNOP_COND:
- case TERNOP_SLICE:
- args = 3;
- break;
-
- /* Modula-2 */
- case MULTI_SUBSCRIPT:
- oplen = 3;
- args = 1 + longest_to_int (expr->elts[endpos - 2].longconst);
- break;
-
- case BINOP_ASSIGN_MODIFY:
- oplen = 3;
- args = 2;
- break;
-
- /* C++ */
- case OP_THIS:
- oplen = 2;
- break;
-
- case OP_RANGE:
- oplen = 3;
- range_type = (enum range_type)
- longest_to_int (expr->elts[endpos - 2].longconst);
-
- switch (range_type)
- {
- case LOW_BOUND_DEFAULT:
- case LOW_BOUND_DEFAULT_EXCLUSIVE:
- case HIGH_BOUND_DEFAULT:
- args = 1;
- break;
- case BOTH_BOUND_DEFAULT:
- args = 0;
- break;
- case NONE_BOUND_DEFAULT:
- case NONE_BOUND_DEFAULT_EXCLUSIVE:
- args = 2;
- break;
- }
-
- break;
-
- default:
- args = 1 + (i < (int) BINOP_END);
- }
-
- *oplenp = oplen;
- *argsp = args;
-}
-
-/* Copy the subexpression ending just before index INEND in INEXPR
- into OUTEXPR, starting at index OUTBEG.
- In the process, convert it from suffix to prefix form.
- If LAST_STRUCT is -1, then this function always returns -1.
- Otherwise, it returns the index of the subexpression which is the
- left-hand-side of the expression at LAST_STRUCT. */
-
-static int
-prefixify_subexp (struct expression *inexpr,
- struct expression *outexpr, int inend, int outbeg,
- int last_struct)
-{
- int oplen;
- int args;
- int i;
- int *arglens;
- int result = -1;
-
- operator_length (inexpr, inend, &oplen, &args);
-
- /* Copy the final operator itself, from the end of the input
- to the beginning of the output. */
- inend -= oplen;
- memcpy (&outexpr->elts[outbeg], &inexpr->elts[inend],
- EXP_ELEM_TO_BYTES (oplen));
- outbeg += oplen;
-
- if (last_struct == inend)
- result = outbeg - oplen;
-
- /* Find the lengths of the arg subexpressions. */
- arglens = (int *) alloca (args * sizeof (int));
- for (i = args - 1; i >= 0; i--)
- {
- oplen = length_of_subexp (inexpr, inend);
- arglens[i] = oplen;
- inend -= oplen;
- }
-
- /* Now copy each subexpression, preserving the order of
- the subexpressions, but prefixifying each one.
- In this loop, inend starts at the beginning of
- the expression this level is working on
- and marches forward over the arguments.
- outbeg does similarly in the output. */
- for (i = 0; i < args; i++)
- {
- int r;
-
- oplen = arglens[i];
- inend += oplen;
- r = prefixify_subexp (inexpr, outexpr, inend, outbeg, last_struct);
- if (r != -1)
- {
- /* Return immediately. We probably have only parsed a
- partial expression, so we don't want to try to reverse
- the other operands. */
- return r;
- }
- outbeg += oplen;
- }
-
- return result;
-}
-\f
-/* Read an expression from the string *STRINGPTR points to,
- parse it, and return a pointer to a struct expression that we malloc.
- Use block BLOCK as the lexical context for variable names;
- if BLOCK is zero, use the block of the selected stack frame.
- Meanwhile, advance *STRINGPTR to point after the expression,
- at the first nonwhite character that is not part of the expression
- (possibly a null character).
-
- If COMMA is nonzero, stop if a comma is reached. */
-
-expression_up
-parse_exp_1 (const char **stringptr, CORE_ADDR pc, const struct block *block,
- int comma, innermost_block_tracker *tracker)
-{
- return parse_exp_in_context (stringptr, pc, block, comma, 0, NULL,
- tracker, nullptr);
-}
-
/* As for parse_exp_1, except that if VOID_CONTEXT_P, then
- no value is expected from the expression.
- OUT_SUBEXP is set when attempting to complete a field name; in this
- case it is set to the index of the subexpression on the
- left-hand-side of the struct op. If not doing such completion, it
- is left untouched. */
+ no value is expected from the expression. */
static expression_up
parse_exp_in_context (const char **stringptr, CORE_ADDR pc,
const struct block *block,
- int comma, int void_context_p, int *out_subexp,
+ parser_flags flags,
innermost_block_tracker *tracker,
- expr_completion_state *cstate)
+ std::unique_ptr<expr_completion_base> *completer)
{
const struct language_defn *lang = NULL;
- int subexp;
if (*stringptr == 0 || **stringptr == 0)
error_no_arg (_("expression to compute"));
if (tracker == nullptr)
tracker = &local_tracker;
- /* If no context specified, try using the current frame, if any. */
- if (!expression_context_block)
- expression_context_block = get_selected_block (&expression_context_pc);
- else if (pc == 0)
- expression_context_pc = BLOCK_ENTRY_PC (expression_context_block);
- else
- expression_context_pc = pc;
-
- /* Fall back to using the current source static context, if any. */
-
- if (!expression_context_block)
+ if ((flags & PARSER_LEAVE_BLOCK_ALONE) == 0)
{
- struct symtab_and_line cursal = get_current_source_symtab_and_line ();
- if (cursal.symtab)
+ /* If no context specified, try using the current frame, if any. */
+ if (!expression_context_block)
expression_context_block
- = BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (cursal.symtab),
- STATIC_BLOCK);
- if (expression_context_block)
- expression_context_pc = BLOCK_ENTRY_PC (expression_context_block);
+ = get_selected_block (&expression_context_pc);
+ else if (pc == 0)
+ expression_context_pc = expression_context_block->entry_pc ();
+ else
+ expression_context_pc = pc;
+
+ /* Fall back to using the current source static context, if any. */
+
+ if (!expression_context_block)
+ {
+ struct symtab_and_line cursal
+ = get_current_source_symtab_and_line ();
+
+ if (cursal.symtab)
+ expression_context_block
+ = cursal.symtab->compunit ()->blockvector ()->static_block ();
+
+ if (expression_context_block)
+ expression_context_pc = expression_context_block->entry_pc ();
+ }
}
if (language_mode == language_mode_auto && block != NULL)
{
/* Find the language associated to the given context block.
- Default to the current language if it can not be determined.
-
- Note that using the language corresponding to the current frame
- can sometimes give unexpected results. For instance, this
- routine is often called several times during the inferior
- startup phase to re-parse breakpoint expressions after
- a new shared library has been loaded. The language associated
- to the current frame at this moment is not relevant for
- the breakpoint. Using it would therefore be silly, so it seems
- better to rely on the current language rather than relying on
- the current frame language to parse the expression. That's why
- we do the following language detection only if the context block
- has been specifically provided. */
- struct symbol *func = block_linkage_function (block);
+ Default to the current language if it can not be determined.
+
+ Note that using the language corresponding to the current frame
+ can sometimes give unexpected results. For instance, this
+ routine is often called several times during the inferior
+ startup phase to re-parse breakpoint expressions after
+ a new shared library has been loaded. The language associated
+ to the current frame at this moment is not relevant for
+ the breakpoint. Using it would therefore be silly, so it seems
+ better to rely on the current language rather than relying on
+ the current frame language to parse the expression. That's why
+ we do the following language detection only if the context block
+ has been specifically provided. */
+ struct symbol *func = block->linkage_function ();
if (func != NULL)
- lang = language_def (SYMBOL_LANGUAGE (func));
+ lang = language_def (func->language ());
if (lang == NULL || lang->la_language == language_unknown)
- lang = current_language;
+ lang = current_language;
}
else
lang = current_language;
to the value matching SELECTED_FRAME as set by get_current_arch. */
parser_state ps (lang, get_current_arch (), expression_context_block,
- expression_context_pc, comma, *stringptr,
- cstate != nullptr, tracker);
+ expression_context_pc, flags, *stringptr,
+ completer != nullptr, tracker);
scoped_restore_current_language lang_saver;
set_language (lang->la_language);
try
{
- lang->la_parser (&ps);
+ lang->parser (&ps);
}
- catch (const gdb_exception &except)
+ catch (const gdb_exception_error &except)
{
/* If parsing for completion, allow this to succeed; but if no
expression elements have been written, then there's nothing
to do, so fail. */
- if (! ps.parse_completion || ps.expout_ptr == 0)
+ if (! ps.parse_completion || ps.expout->op == nullptr)
throw;
}
- /* We have to operate on an "expression *", due to la_post_parser,
- which explains this funny-looking double release. */
expression_up result = ps.release ();
-
- /* Convert expression from postfix form as generated by yacc
- parser, to a prefix form. */
-
- if (expressiondebug)
- dump_raw_expression (result.get (), gdb_stdlog,
- "before conversion to prefix form");
-
- subexp = prefixify_expression (result.get (),
- ps.m_completion_state.expout_last_struct);
- if (out_subexp)
- *out_subexp = subexp;
-
- lang->la_post_parser (&result, void_context_p, ps.parse_completion,
- tracker);
+ result->op->set_outermost ();
if (expressiondebug)
- dump_prefix_expression (result.get (), gdb_stdlog);
+ result->dump (gdb_stdlog);
- if (cstate != nullptr)
- *cstate = std::move (ps.m_completion_state);
+ if (completer != nullptr)
+ *completer = std::move (ps.m_completion_state);
*stringptr = ps.lexptr;
return result;
}
-/* Parse STRING as an expression, and complain if this fails
- to use up all of the contents of STRING. */
+/* Read an expression from the string *STRINGPTR points to,
+ parse it, and return a pointer to a struct expression that we malloc.
+ Use block BLOCK as the lexical context for variable names;
+ if BLOCK is zero, use the block of the selected stack frame.
+ Meanwhile, advance *STRINGPTR to point after the expression,
+ at the first nonwhite character that is not part of the expression
+ (possibly a null character). FLAGS are passed to the parser. */
expression_up
-parse_expression (const char *string, innermost_block_tracker *tracker)
+parse_exp_1 (const char **stringptr, CORE_ADDR pc, const struct block *block,
+ parser_flags flags, innermost_block_tracker *tracker)
{
- expression_up exp = parse_exp_1 (&string, 0, 0, 0, tracker);
+ return parse_exp_in_context (stringptr, pc, block, flags,
+ tracker, nullptr);
+}
+
+/* Parse STRING as an expression, and complain if this fails to use up
+ all of the contents of STRING. TRACKER, if non-null, will be
+ updated by the parser. FLAGS are passed to the parser. */
+
+expression_up
+parse_expression (const char *string, innermost_block_tracker *tracker,
+ parser_flags flags)
+{
+ expression_up exp = parse_exp_in_context (&string, 0, nullptr, flags,
+ tracker, nullptr);
if (*string)
error (_("Junk after end of expression."));
return exp;
expression_up
parse_expression_with_language (const char *string, enum language lang)
{
- gdb::optional<scoped_restore_current_language> lang_saver;
+ std::optional<scoped_restore_current_language> lang_saver;
if (current_language->la_language != lang)
{
lang_saver.emplace ();
return parse_expression (string);
}
-/* Parse STRING as an expression. If parsing ends in the middle of a
- field reference, return the type of the left-hand-side of the
- reference; furthermore, if the parsing ends in the field name,
- return the field name in *NAME. If the parsing ends in the middle
- of a field reference, but the reference is somehow invalid, throw
- an exception. In all other cases, return NULL. */
-
-struct type *
-parse_expression_for_completion (const char *string,
- gdb::unique_xmalloc_ptr<char> *name,
- enum type_code *code)
+/* Parse STRING as an expression. If the parse is marked for
+ completion, set COMPLETER and return the expression. In all other
+ cases, return NULL. */
+
+expression_up
+parse_expression_for_completion
+ (const char *string,
+ std::unique_ptr<expr_completion_base> *completer)
{
expression_up exp;
- struct value *val;
- int subexp;
- expr_completion_state cstate;
try
{
- exp = parse_exp_in_context (&string, 0, 0, 0, 0, &subexp,
- nullptr, &cstate);
+ exp = parse_exp_in_context (&string, 0, 0, 0, nullptr, completer);
}
catch (const gdb_exception_error &except)
{
/* Nothing, EXP remains NULL. */
}
- if (exp == NULL)
- return NULL;
-
- if (cstate.expout_tag_completion_type != TYPE_CODE_UNDEF)
- {
- *code = cstate.expout_tag_completion_type;
- *name = std::move (cstate.expout_completion_name);
- return NULL;
- }
-
- if (cstate.expout_last_struct == -1)
- return NULL;
-
- const char *fieldname = extract_field_op (exp.get (), &subexp);
- if (fieldname == NULL)
- {
- name->reset ();
- return NULL;
- }
-
- name->reset (xstrdup (fieldname));
- /* This might throw an exception. If so, we want to let it
- propagate. */
- val = evaluate_subexpression_type (exp.get (), subexp);
-
- return value_type (val);
-}
-
-/* A post-parser that does nothing. */
+ /* If we didn't get a completion result, be sure to also not return
+ an expression to our caller. */
+ if (*completer == nullptr)
+ return nullptr;
-void
-null_post_parser (expression_up *exp, int void_context_p, int completin,
- innermost_block_tracker *tracker)
-{
+ return exp;
}
/* Parse floating point value P of length LEN.
{
return target_float_from_string (data, type, std::string (p, len));
}
-\f
-/* This function avoids direct calls to fprintf
- in the parser generated debug code. */
-void
-parser_fprintf (FILE *x, const char *y, ...)
-{
- va_list args;
- va_start (args, y);
- if (x == stderr)
- vfprintf_unfiltered (gdb_stderr, y, args);
- else
- {
- fprintf_unfiltered (gdb_stderr, " Unknown FILE used.\n");
- vfprintf_unfiltered (gdb_stderr, y, args);
- }
- va_end (args);
-}
+/* Return true if the number N_SIGN * N fits in a type with TYPE_BITS and
+ TYPE_SIGNED_P. N_SIGNED is either 1 or -1. */
-/* Implementation of the exp_descriptor method operator_check. */
-
-int
-operator_check_standard (struct expression *exp, int pos,
- int (*objfile_func) (struct objfile *objfile,
- void *data),
- void *data)
+bool
+fits_in_type (int n_sign, ULONGEST n, int type_bits, bool type_signed_p)
{
- const union exp_element *const elts = exp->elts;
- struct type *type = NULL;
- struct objfile *objfile = NULL;
+ /* Normalize -0. */
+ if (n == 0 && n_sign == -1)
+ n_sign = 1;
- /* Extended operators should have been already handled by exp_descriptor
- iterate method of its specific language. */
- gdb_assert (elts[pos].opcode < OP_EXTENDED0);
+ if (n_sign == -1 && !type_signed_p)
+ /* Can't fit a negative number in an unsigned type. */
+ return false;
- /* Track the callers of write_exp_elt_type for this table. */
+ if (type_bits > sizeof (ULONGEST) * 8)
+ return true;
- switch (elts[pos].opcode)
+ ULONGEST smax = (ULONGEST)1 << (type_bits - 1);
+ if (n_sign == -1)
{
- case BINOP_VAL:
- case OP_COMPLEX:
- case OP_FLOAT:
- case OP_LONG:
- case OP_SCOPE:
- case OP_TYPE:
- case UNOP_CAST:
- case UNOP_MAX:
- case UNOP_MEMVAL:
- case UNOP_MIN:
- type = elts[pos + 1].type;
- break;
-
- case TYPE_INSTANCE:
- {
- LONGEST arg, nargs = elts[pos + 2].longconst;
-
- for (arg = 0; arg < nargs; arg++)
- {
- struct type *inst_type = elts[pos + 3 + arg].type;
- struct objfile *inst_objfile = TYPE_OBJFILE (inst_type);
-
- if (inst_objfile && (*objfile_func) (inst_objfile, data))
- return 1;
- }
- }
- break;
-
- case OP_VAR_VALUE:
- {
- const struct block *const block = elts[pos + 1].block;
- const struct symbol *const symbol = elts[pos + 2].symbol;
-
- /* Check objfile where the variable itself is placed.
- SYMBOL_OBJ_SECTION (symbol) may be NULL. */
- if ((*objfile_func) (symbol_objfile (symbol), data))
- return 1;
-
- /* Check objfile where is placed the code touching the variable. */
- objfile = lookup_objfile_from_block (block);
-
- type = SYMBOL_TYPE (symbol);
- }
- break;
- case OP_VAR_MSYM_VALUE:
- objfile = elts[pos + 1].objfile;
- break;
+ /* Negative number, signed type. */
+ return (n <= smax);
}
-
- /* Invoke callbacks for TYPE and OBJFILE if they were set as non-NULL. */
-
- if (type && TYPE_OBJFILE (type)
- && (*objfile_func) (TYPE_OBJFILE (type), data))
- return 1;
- if (objfile && (*objfile_func) (objfile, data))
- return 1;
-
- return 0;
-}
-
-/* Call OBJFILE_FUNC for any objfile found being referenced by EXP.
- OBJFILE_FUNC is never called with NULL OBJFILE. OBJFILE_FUNC get
- passed an arbitrary caller supplied DATA pointer. If OBJFILE_FUNC
- returns non-zero value then (any other) non-zero value is immediately
- returned to the caller. Otherwise zero is returned after iterating
- through whole EXP. */
-
-static int
-exp_iterate (struct expression *exp,
- int (*objfile_func) (struct objfile *objfile, void *data),
- void *data)
-{
- int endpos;
-
- for (endpos = exp->nelts; endpos > 0; )
+ else if (n_sign == 1 && type_signed_p)
{
- int pos, args, oplen = 0;
-
- operator_length (exp, endpos, &oplen, &args);
- gdb_assert (oplen > 0);
-
- pos = endpos - oplen;
- if (exp->language_defn->la_exp_desc->operator_check (exp, pos,
- objfile_func, data))
- return 1;
-
- endpos = pos;
+ /* Positive number, signed type. */
+ return (n < smax);
}
-
- return 0;
+ else if (n_sign == 1 && !type_signed_p)
+ {
+ /* Positive number, unsigned type. */
+ return ((n >> 1) >> (type_bits - 1)) == 0;
+ }
+ else
+ gdb_assert_not_reached ("");
}
-/* Helper for exp_uses_objfile. */
+/* Return true if the number N_SIGN * N fits in a type with TYPE_BITS and
+ TYPE_SIGNED_P. N_SIGNED is either 1 or -1. */
-static int
-exp_uses_objfile_iter (struct objfile *exp_objfile, void *objfile_voidp)
+bool
+fits_in_type (int n_sign, const gdb_mpz &n, int type_bits, bool type_signed_p)
{
- struct objfile *objfile = (struct objfile *) objfile_voidp;
-
- if (exp_objfile->separate_debug_objfile_backlink)
- exp_objfile = exp_objfile->separate_debug_objfile_backlink;
+ /* N must be nonnegative. */
+ gdb_assert (n.sgn () >= 0);
- return exp_objfile == objfile;
-}
-
-/* Return 1 if EXP uses OBJFILE (and will become dangling when OBJFILE
- is unloaded), otherwise return 0. OBJFILE must not be a separate debug info
- file. */
+ /* Zero always fits. */
+ /* Normalize -0. */
+ if (n.sgn () == 0)
+ return true;
-int
-exp_uses_objfile (struct expression *exp, struct objfile *objfile)
-{
- gdb_assert (objfile->separate_debug_objfile_backlink == NULL);
+ if (n_sign == -1 && !type_signed_p)
+ /* Can't fit a negative number in an unsigned type. */
+ return false;
- return exp_iterate (exp, exp_uses_objfile_iter, objfile);
+ gdb_mpz max = gdb_mpz::pow (2, (type_signed_p
+ ? type_bits - 1
+ : type_bits));
+ if (n_sign == -1)
+ return n <= max;
+ return n < max;
}
+\f
+/* This function avoids direct calls to fprintf
+ in the parser generated debug code. */
+void
+parser_fprintf (FILE *x, const char *y, ...)
+{
+ va_list args;
-/* Reallocate the `expout' pointer inside PS so that it can accommodate
- at least LENELT expression elements. This function does nothing if
- there is enough room for the elements. */
-
-static void
-increase_expout_size (struct expr_builder *ps, size_t lenelt)
-{
- if ((ps->expout_ptr + lenelt) >= ps->expout_size)
+ va_start (args, y);
+ if (x == stderr)
+ gdb_vprintf (gdb_stderr, y, args);
+ else
{
- ps->expout_size = std::max (ps->expout_size * 2,
- ps->expout_ptr + lenelt + 10);
- ps->expout.reset (XRESIZEVAR (expression,
- ps->expout.release (),
- (sizeof (struct expression)
- + EXP_ELEM_TO_BYTES (ps->expout_size))));
+ gdb_printf (gdb_stderr, " Unknown FILE used.\n");
+ gdb_vprintf (gdb_stderr, y, args);
}
+ va_end (args);
}
+void _initialize_parse ();
void
-_initialize_parse (void)
+_initialize_parse ()
{
add_setshow_zuinteger_cmd ("expression", class_maintenance,
&expressiondebug,
projects / thirdparty / binutils-gdb.git / blobdiff