1 /* Parse expressions for GDB.
3 Copyright (C) 1986-2017 Free Software Foundation, Inc.
5 Modified from expread.y by the Department of Computer Science at the
6 State University of New York at Buffalo, 1991.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 /* Parse an expression from text in a string,
24 and return the result as a struct expression pointer.
25 That structure contains arithmetic operations in reverse polish,
26 with constants represented by operations that are followed by special data.
27 See expression.h for the details of the format.
28 What is important here is that it can be built up sequentially
29 during the process of parsing; the lower levels of the tree always
30 come first in the result. */
34 #include "arch-utils.h"
38 #include "expression.h"
43 #include "parser-defs.h"
45 #include "symfile.h" /* for overlay functions */
47 #include "target-float.h"
51 #include "user-regs.h"
53 #include "common/gdb_optional.h"
55 /* Standard set of definitions for printing, dumping, prefixifying,
56 * and evaluating expressions. */
58 const struct exp_descriptor exp_descriptor_standard
=
60 print_subexp_standard
,
61 operator_length_standard
,
62 operator_check_standard
,
64 dump_subexp_body_standard
,
65 evaluate_subexp_standard
68 /* Global variables declared in parser-defs.h (and commented there). */
69 const struct block
*expression_context_block
;
70 CORE_ADDR expression_context_pc
;
71 const struct block
*innermost_block
;
73 static struct type_stack type_stack
;
75 const char *prev_lexptr
;
79 /* True if parsing an expression to attempt completion. */
82 /* The index of the last struct expression directly before a '.' or
83 '->'. This is set when parsing and is only used when completing a
84 field name. It is -1 if no dereference operation was found. */
85 static int expout_last_struct
= -1;
87 /* If we are completing a tagged type name, this will be nonzero. */
88 static enum type_code expout_tag_completion_type
= TYPE_CODE_UNDEF
;
90 /* The token for tagged type name completion. */
91 static char *expout_completion_name
;
94 static unsigned int expressiondebug
= 0;
96 show_expressiondebug (struct ui_file
*file
, int from_tty
,
97 struct cmd_list_element
*c
, const char *value
)
99 fprintf_filtered (file
, _("Expression debugging is %s.\n"), value
);
103 /* Non-zero if an expression parser should set yydebug. */
107 show_parserdebug (struct ui_file
*file
, int from_tty
,
108 struct cmd_list_element
*c
, const char *value
)
110 fprintf_filtered (file
, _("Parser debugging is %s.\n"), value
);
114 static int prefixify_subexp (struct expression
*, struct expression
*, int,
117 static expression_up
parse_exp_in_context (const char **, CORE_ADDR
,
118 const struct block
*, int,
120 static expression_up
parse_exp_in_context_1 (const char **, CORE_ADDR
,
121 const struct block
*, int,
124 /* Data structure for saving values of arglist_len for function calls whose
125 arguments contain other function calls. */
127 static std::vector
<int> *funcall_chain
;
129 /* Begin counting arguments for a function call,
130 saving the data about any containing call. */
135 funcall_chain
->push_back (arglist_len
);
139 /* Return the number of arguments in a function call just terminated,
140 and restore the data for the containing function call. */
145 int val
= arglist_len
;
146 arglist_len
= funcall_chain
->back ();
147 funcall_chain
->pop_back ();
153 /* See definition in parser-defs.h. */
156 initialize_expout (struct parser_state
*ps
, size_t initial_size
,
157 const struct language_defn
*lang
,
158 struct gdbarch
*gdbarch
)
160 ps
->expout_size
= initial_size
;
163 = (struct expression
*) xmalloc (sizeof (struct expression
)
164 + EXP_ELEM_TO_BYTES (ps
->expout_size
));
165 ps
->expout
->language_defn
= lang
;
166 ps
->expout
->gdbarch
= gdbarch
;
169 /* See definition in parser-defs.h. */
172 reallocate_expout (struct parser_state
*ps
)
174 /* Record the actual number of expression elements, and then
175 reallocate the expression memory so that we free up any
178 ps
->expout
->nelts
= ps
->expout_ptr
;
179 ps
->expout
= (struct expression
*)
180 xrealloc (ps
->expout
,
181 sizeof (struct expression
)
182 + EXP_ELEM_TO_BYTES (ps
->expout_ptr
));
185 /* This page contains the functions for adding data to the struct expression
186 being constructed. */
188 /* Add one element to the end of the expression. */
190 /* To avoid a bug in the Sun 4 compiler, we pass things that can fit into
191 a register through here. */
194 write_exp_elt (struct parser_state
*ps
, const union exp_element
*expelt
)
196 if (ps
->expout_ptr
>= ps
->expout_size
)
198 ps
->expout_size
*= 2;
199 ps
->expout
= (struct expression
*)
200 xrealloc (ps
->expout
, sizeof (struct expression
)
201 + EXP_ELEM_TO_BYTES (ps
->expout_size
));
203 ps
->expout
->elts
[ps
->expout_ptr
++] = *expelt
;
207 write_exp_elt_opcode (struct parser_state
*ps
, enum exp_opcode expelt
)
209 union exp_element tmp
;
211 memset (&tmp
, 0, sizeof (union exp_element
));
213 write_exp_elt (ps
, &tmp
);
217 write_exp_elt_sym (struct parser_state
*ps
, struct symbol
*expelt
)
219 union exp_element tmp
;
221 memset (&tmp
, 0, sizeof (union exp_element
));
223 write_exp_elt (ps
, &tmp
);
227 write_exp_elt_msym (struct parser_state
*ps
, minimal_symbol
*expelt
)
229 union exp_element tmp
;
231 memset (&tmp
, 0, sizeof (union exp_element
));
232 tmp
.msymbol
= expelt
;
233 write_exp_elt (ps
, &tmp
);
237 write_exp_elt_block (struct parser_state
*ps
, const struct block
*b
)
239 union exp_element tmp
;
241 memset (&tmp
, 0, sizeof (union exp_element
));
243 write_exp_elt (ps
, &tmp
);
247 write_exp_elt_objfile (struct parser_state
*ps
, struct objfile
*objfile
)
249 union exp_element tmp
;
251 memset (&tmp
, 0, sizeof (union exp_element
));
252 tmp
.objfile
= objfile
;
253 write_exp_elt (ps
, &tmp
);
257 write_exp_elt_longcst (struct parser_state
*ps
, LONGEST expelt
)
259 union exp_element tmp
;
261 memset (&tmp
, 0, sizeof (union exp_element
));
262 tmp
.longconst
= expelt
;
263 write_exp_elt (ps
, &tmp
);
267 write_exp_elt_floatcst (struct parser_state
*ps
, const gdb_byte expelt
[16])
269 union exp_element tmp
;
272 for (index
= 0; index
< 16; index
++)
273 tmp
.floatconst
[index
] = expelt
[index
];
275 write_exp_elt (ps
, &tmp
);
279 write_exp_elt_type (struct parser_state
*ps
, struct type
*expelt
)
281 union exp_element tmp
;
283 memset (&tmp
, 0, sizeof (union exp_element
));
285 write_exp_elt (ps
, &tmp
);
289 write_exp_elt_intern (struct parser_state
*ps
, struct internalvar
*expelt
)
291 union exp_element tmp
;
293 memset (&tmp
, 0, sizeof (union exp_element
));
294 tmp
.internalvar
= expelt
;
295 write_exp_elt (ps
, &tmp
);
298 /* Add a string constant to the end of the expression.
300 String constants are stored by first writing an expression element
301 that contains the length of the string, then stuffing the string
302 constant itself into however many expression elements are needed
303 to hold it, and then writing another expression element that contains
304 the length of the string. I.e. an expression element at each end of
305 the string records the string length, so you can skip over the
306 expression elements containing the actual string bytes from either
307 end of the string. Note that this also allows gdb to handle
308 strings with embedded null bytes, as is required for some languages.
310 Don't be fooled by the fact that the string is null byte terminated,
311 this is strictly for the convenience of debugging gdb itself.
312 Gdb does not depend up the string being null terminated, since the
313 actual length is recorded in expression elements at each end of the
314 string. The null byte is taken into consideration when computing how
315 many expression elements are required to hold the string constant, of
320 write_exp_string (struct parser_state
*ps
, struct stoken str
)
322 int len
= str
.length
;
326 /* Compute the number of expression elements required to hold the string
327 (including a null byte terminator), along with one expression element
328 at each end to record the actual string length (not including the
329 null byte terminator). */
331 lenelt
= 2 + BYTES_TO_EXP_ELEM (len
+ 1);
333 increase_expout_size (ps
, lenelt
);
335 /* Write the leading length expression element (which advances the current
336 expression element index), then write the string constant followed by a
337 terminating null byte, and then write the trailing length expression
340 write_exp_elt_longcst (ps
, (LONGEST
) len
);
341 strdata
= (char *) &ps
->expout
->elts
[ps
->expout_ptr
];
342 memcpy (strdata
, str
.ptr
, len
);
343 *(strdata
+ len
) = '\0';
344 ps
->expout_ptr
+= lenelt
- 2;
345 write_exp_elt_longcst (ps
, (LONGEST
) len
);
348 /* Add a vector of string constants to the end of the expression.
350 This adds an OP_STRING operation, but encodes the contents
351 differently from write_exp_string. The language is expected to
352 handle evaluation of this expression itself.
354 After the usual OP_STRING header, TYPE is written into the
355 expression as a long constant. The interpretation of this field is
356 up to the language evaluator.
358 Next, each string in VEC is written. The length is written as a
359 long constant, followed by the contents of the string. */
362 write_exp_string_vector (struct parser_state
*ps
, int type
,
363 struct stoken_vector
*vec
)
368 /* Compute the size. We compute the size in number of slots to
369 avoid issues with string padding. */
371 for (i
= 0; i
< vec
->len
; ++i
)
373 /* One slot for the length of this element, plus the number of
374 slots needed for this string. */
375 n_slots
+= 1 + BYTES_TO_EXP_ELEM (vec
->tokens
[i
].length
);
378 /* One more slot for the type of the string. */
381 /* Now compute a phony string length. */
382 len
= EXP_ELEM_TO_BYTES (n_slots
) - 1;
385 increase_expout_size (ps
, n_slots
);
387 write_exp_elt_opcode (ps
, OP_STRING
);
388 write_exp_elt_longcst (ps
, len
);
389 write_exp_elt_longcst (ps
, type
);
391 for (i
= 0; i
< vec
->len
; ++i
)
393 write_exp_elt_longcst (ps
, vec
->tokens
[i
].length
);
394 memcpy (&ps
->expout
->elts
[ps
->expout_ptr
], vec
->tokens
[i
].ptr
,
395 vec
->tokens
[i
].length
);
396 ps
->expout_ptr
+= BYTES_TO_EXP_ELEM (vec
->tokens
[i
].length
);
399 write_exp_elt_longcst (ps
, len
);
400 write_exp_elt_opcode (ps
, OP_STRING
);
403 /* Add a bitstring constant to the end of the expression.
405 Bitstring constants are stored by first writing an expression element
406 that contains the length of the bitstring (in bits), then stuffing the
407 bitstring constant itself into however many expression elements are
408 needed to hold it, and then writing another expression element that
409 contains the length of the bitstring. I.e. an expression element at
410 each end of the bitstring records the bitstring length, so you can skip
411 over the expression elements containing the actual bitstring bytes from
412 either end of the bitstring. */
415 write_exp_bitstring (struct parser_state
*ps
, struct stoken str
)
417 int bits
= str
.length
; /* length in bits */
418 int len
= (bits
+ HOST_CHAR_BIT
- 1) / HOST_CHAR_BIT
;
422 /* Compute the number of expression elements required to hold the bitstring,
423 along with one expression element at each end to record the actual
424 bitstring length in bits. */
426 lenelt
= 2 + BYTES_TO_EXP_ELEM (len
);
428 increase_expout_size (ps
, lenelt
);
430 /* Write the leading length expression element (which advances the current
431 expression element index), then write the bitstring constant, and then
432 write the trailing length expression element. */
434 write_exp_elt_longcst (ps
, (LONGEST
) bits
);
435 strdata
= (char *) &ps
->expout
->elts
[ps
->expout_ptr
];
436 memcpy (strdata
, str
.ptr
, len
);
437 ps
->expout_ptr
+= lenelt
- 2;
438 write_exp_elt_longcst (ps
, (LONGEST
) bits
);
441 /* Return the type of MSYMBOL, a minimal symbol of OBJFILE. If
442 ADDRESS_P is not NULL, set it to the MSYMBOL's resolved
446 find_minsym_type_and_address (minimal_symbol
*msymbol
,
447 struct objfile
*objfile
,
448 CORE_ADDR
*address_p
)
450 bound_minimal_symbol bound_msym
= {msymbol
, objfile
};
451 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
452 struct obj_section
*section
= MSYMBOL_OBJ_SECTION (objfile
, msymbol
);
453 enum minimal_symbol_type type
= MSYMBOL_TYPE (msymbol
);
456 bool is_tls
= (section
!= NULL
457 && section
->the_bfd_section
->flags
& SEC_THREAD_LOCAL
);
459 /* Addresses of TLS symbols are really offsets into a
460 per-objfile/per-thread storage block. */
461 CORE_ADDR addr
= (is_tls
462 ? MSYMBOL_VALUE_RAW_ADDRESS (bound_msym
.minsym
)
463 : BMSYMBOL_VALUE_ADDRESS (bound_msym
));
465 /* The minimal symbol might point to a function descriptor;
466 resolve it to the actual code address instead. */
467 pc
= gdbarch_convert_from_func_ptr_addr (gdbarch
, addr
, ¤t_target
);
470 struct bound_minimal_symbol ifunc_msym
= lookup_minimal_symbol_by_pc (pc
);
472 /* In this case, assume we have a code symbol instead of
475 if (ifunc_msym
.minsym
!= NULL
476 && MSYMBOL_TYPE (ifunc_msym
.minsym
) == mst_text_gnu_ifunc
477 && BMSYMBOL_VALUE_ADDRESS (ifunc_msym
) == pc
)
479 /* A function descriptor has been resolved but PC is still in the
480 STT_GNU_IFUNC resolver body (such as because inferior does not
481 run to be able to call it). */
483 type
= mst_text_gnu_ifunc
;
491 if (overlay_debugging
)
492 addr
= symbol_overlayed_address (addr
, section
);
496 /* Skip translation if caller does not need the address. */
497 if (address_p
!= NULL
)
498 *address_p
= target_translate_tls_address (objfile
, addr
);
499 return objfile_type (objfile
)->nodebug_tls_symbol
;
502 if (address_p
!= NULL
)
505 struct type
*the_type
;
511 case mst_solib_trampoline
:
512 return objfile_type (objfile
)->nodebug_text_symbol
;
514 case mst_text_gnu_ifunc
:
515 return objfile_type (objfile
)->nodebug_text_gnu_ifunc_symbol
;
521 return objfile_type (objfile
)->nodebug_data_symbol
;
523 case mst_slot_got_plt
:
524 return objfile_type (objfile
)->nodebug_got_plt_symbol
;
527 return objfile_type (objfile
)->nodebug_unknown_symbol
;
531 /* Add the appropriate elements for a minimal symbol to the end of
535 write_exp_msymbol (struct parser_state
*ps
,
536 struct bound_minimal_symbol bound_msym
)
538 write_exp_elt_opcode (ps
, OP_VAR_MSYM_VALUE
);
539 write_exp_elt_objfile (ps
, bound_msym
.objfile
);
540 write_exp_elt_msym (ps
, bound_msym
.minsym
);
541 write_exp_elt_opcode (ps
, OP_VAR_MSYM_VALUE
);
544 /* Mark the current index as the starting location of a structure
545 expression. This is used when completing on field names. */
548 mark_struct_expression (struct parser_state
*ps
)
550 gdb_assert (parse_completion
551 && expout_tag_completion_type
== TYPE_CODE_UNDEF
);
552 expout_last_struct
= ps
->expout_ptr
;
555 /* Indicate that the current parser invocation is completing a tag.
556 TAG is the type code of the tag, and PTR and LENGTH represent the
557 start of the tag name. */
560 mark_completion_tag (enum type_code tag
, const char *ptr
, int length
)
562 gdb_assert (parse_completion
563 && expout_tag_completion_type
== TYPE_CODE_UNDEF
564 && expout_completion_name
== NULL
565 && expout_last_struct
== -1);
566 gdb_assert (tag
== TYPE_CODE_UNION
567 || tag
== TYPE_CODE_STRUCT
568 || tag
== TYPE_CODE_ENUM
);
569 expout_tag_completion_type
= tag
;
570 expout_completion_name
= (char *) xmalloc (length
+ 1);
571 memcpy (expout_completion_name
, ptr
, length
);
572 expout_completion_name
[length
] = '\0';
576 /* Recognize tokens that start with '$'. These include:
578 $regname A native register name or a "standard
581 $variable A convenience variable with a name chosen
584 $digits Value history with index <digits>, starting
585 from the first value which has index 1.
587 $$digits Value history with index <digits> relative
588 to the last value. I.e. $$0 is the last
589 value, $$1 is the one previous to that, $$2
590 is the one previous to $$1, etc.
592 $ | $0 | $$0 The last value in the value history.
594 $$ An abbreviation for the second to the last
595 value in the value history, I.e. $$1 */
598 write_dollar_variable (struct parser_state
*ps
, struct stoken str
)
600 struct block_symbol sym
;
601 struct bound_minimal_symbol msym
;
602 struct internalvar
*isym
= NULL
;
604 /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1)
605 and $$digits (equivalent to $<-digits> if you could type that). */
609 /* Double dollar means negate the number and add -1 as well.
610 Thus $$ alone means -1. */
611 if (str
.length
>= 2 && str
.ptr
[1] == '$')
618 /* Just dollars (one or two). */
622 /* Is the rest of the token digits? */
623 for (; i
< str
.length
; i
++)
624 if (!(str
.ptr
[i
] >= '0' && str
.ptr
[i
] <= '9'))
628 i
= atoi (str
.ptr
+ 1 + negate
);
634 /* Handle tokens that refer to machine registers:
635 $ followed by a register name. */
636 i
= user_reg_map_name_to_regnum (parse_gdbarch (ps
),
637 str
.ptr
+ 1, str
.length
- 1);
639 goto handle_register
;
641 /* Any names starting with $ are probably debugger internal variables. */
643 isym
= lookup_only_internalvar (copy_name (str
) + 1);
646 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
647 write_exp_elt_intern (ps
, isym
);
648 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
652 /* On some systems, such as HP-UX and hppa-linux, certain system routines
653 have names beginning with $ or $$. Check for those, first. */
655 sym
= lookup_symbol (copy_name (str
), (struct block
*) NULL
,
659 write_exp_elt_opcode (ps
, OP_VAR_VALUE
);
660 write_exp_elt_block (ps
, sym
.block
);
661 write_exp_elt_sym (ps
, sym
.symbol
);
662 write_exp_elt_opcode (ps
, OP_VAR_VALUE
);
665 msym
= lookup_bound_minimal_symbol (copy_name (str
));
668 write_exp_msymbol (ps
, msym
);
672 /* Any other names are assumed to be debugger internal variables. */
674 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
675 write_exp_elt_intern (ps
, create_internalvar (copy_name (str
) + 1));
676 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
679 write_exp_elt_opcode (ps
, OP_LAST
);
680 write_exp_elt_longcst (ps
, (LONGEST
) i
);
681 write_exp_elt_opcode (ps
, OP_LAST
);
684 write_exp_elt_opcode (ps
, OP_REGISTER
);
687 write_exp_string (ps
, str
);
688 write_exp_elt_opcode (ps
, OP_REGISTER
);
694 find_template_name_end (const char *p
)
697 int just_seen_right
= 0;
698 int just_seen_colon
= 0;
699 int just_seen_space
= 0;
701 if (!p
|| (*p
!= '<'))
712 /* In future, may want to allow these?? */
715 depth
++; /* start nested template */
716 if (just_seen_colon
|| just_seen_right
|| just_seen_space
)
717 return 0; /* but not after : or :: or > or space */
720 if (just_seen_colon
|| just_seen_right
)
721 return 0; /* end a (nested?) template */
722 just_seen_right
= 1; /* but not after : or :: */
723 if (--depth
== 0) /* also disallow >>, insist on > > */
724 return ++p
; /* if outermost ended, return */
727 if (just_seen_space
|| (just_seen_colon
> 1))
728 return 0; /* nested class spec coming up */
729 just_seen_colon
++; /* we allow :: but not :::: */
734 if (!((*p
>= 'a' && *p
<= 'z') || /* allow token chars */
735 (*p
>= 'A' && *p
<= 'Z') ||
736 (*p
>= '0' && *p
<= '9') ||
737 (*p
== '_') || (*p
== ',') || /* commas for template args */
738 (*p
== '&') || (*p
== '*') || /* pointer and ref types */
739 (*p
== '(') || (*p
== ')') || /* function types */
740 (*p
== '[') || (*p
== ']'))) /* array types */
754 /* Return a null-terminated temporary copy of the name of a string token.
756 Tokens that refer to names do so with explicit pointer and length,
757 so they can share the storage that lexptr is parsing.
758 When it is necessary to pass a name to a function that expects
759 a null-terminated string, the substring is copied out
760 into a separate block of storage.
762 N.B. A single buffer is reused on each call. */
765 copy_name (struct stoken token
)
767 /* A temporary buffer for identifiers, so we can null-terminate them.
768 We allocate this with xrealloc. parse_exp_1 used to allocate with
769 alloca, using the size of the whole expression as a conservative
770 estimate of the space needed. However, macro expansion can
771 introduce names longer than the original expression; there's no
772 practical way to know beforehand how large that might be. */
773 static char *namecopy
;
774 static size_t namecopy_size
;
776 /* Make sure there's enough space for the token. */
777 if (namecopy_size
< token
.length
+ 1)
779 namecopy_size
= token
.length
+ 1;
780 namecopy
= (char *) xrealloc (namecopy
, token
.length
+ 1);
783 memcpy (namecopy
, token
.ptr
, token
.length
);
784 namecopy
[token
.length
] = 0;
790 /* See comments on parser-defs.h. */
793 prefixify_expression (struct expression
*expr
)
795 int len
= sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expr
->nelts
);
796 struct expression
*temp
;
797 int inpos
= expr
->nelts
, outpos
= 0;
799 temp
= (struct expression
*) alloca (len
);
801 /* Copy the original expression into temp. */
802 memcpy (temp
, expr
, len
);
804 return prefixify_subexp (temp
, expr
, inpos
, outpos
);
807 /* Return the number of exp_elements in the postfix subexpression
808 of EXPR whose operator is at index ENDPOS - 1 in EXPR. */
811 length_of_subexp (struct expression
*expr
, int endpos
)
815 operator_length (expr
, endpos
, &oplen
, &args
);
819 oplen
+= length_of_subexp (expr
, endpos
- oplen
);
826 /* Sets *OPLENP to the length of the operator whose (last) index is
827 ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that
831 operator_length (const struct expression
*expr
, int endpos
, int *oplenp
,
834 expr
->language_defn
->la_exp_desc
->operator_length (expr
, endpos
,
838 /* Default value for operator_length in exp_descriptor vectors. */
841 operator_length_standard (const struct expression
*expr
, int endpos
,
842 int *oplenp
, int *argsp
)
846 enum range_type range_type
;
850 error (_("?error in operator_length_standard"));
852 i
= (int) expr
->elts
[endpos
- 1].opcode
;
858 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
859 oplen
= 5 + BYTES_TO_EXP_ELEM (oplen
+ 1);
865 case OP_VAR_MSYM_VALUE
:
869 case OP_FUNC_STATIC_VAR
:
870 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
871 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
879 case OP_VAR_ENTRY_VALUE
:
889 case OP_F77_UNDETERMINED_ARGLIST
:
891 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
895 oplen
= 5 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
899 case OP_OBJC_MSGCALL
: /* Objective C message (method) call. */
901 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
910 case UNOP_DYNAMIC_CAST
:
911 case UNOP_REINTERPRET_CAST
:
912 case UNOP_MEMVAL_TYPE
:
940 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
941 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
946 case STRUCTOP_STRUCT
:
953 case OP_OBJC_NSSTRING
: /* Objective C Foundation Class
954 NSString constant. */
955 case OP_OBJC_SELECTOR
: /* Objective C "@selector" pseudo-op. */
957 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
958 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
963 args
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
964 args
-= longest_to_int (expr
->elts
[endpos
- 3].longconst
);
974 case MULTI_SUBSCRIPT
:
976 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
979 case BINOP_ASSIGN_MODIFY
:
991 range_type
= (enum range_type
)
992 longest_to_int (expr
->elts
[endpos
- 2].longconst
);
996 case LOW_BOUND_DEFAULT
:
997 case HIGH_BOUND_DEFAULT
:
1000 case BOTH_BOUND_DEFAULT
:
1003 case NONE_BOUND_DEFAULT
:
1011 args
= 1 + (i
< (int) BINOP_END
);
1018 /* Copy the subexpression ending just before index INEND in INEXPR
1019 into OUTEXPR, starting at index OUTBEG.
1020 In the process, convert it from suffix to prefix form.
1021 If EXPOUT_LAST_STRUCT is -1, then this function always returns -1.
1022 Otherwise, it returns the index of the subexpression which is the
1023 left-hand-side of the expression at EXPOUT_LAST_STRUCT. */
1026 prefixify_subexp (struct expression
*inexpr
,
1027 struct expression
*outexpr
, int inend
, int outbeg
)
1035 operator_length (inexpr
, inend
, &oplen
, &args
);
1037 /* Copy the final operator itself, from the end of the input
1038 to the beginning of the output. */
1040 memcpy (&outexpr
->elts
[outbeg
], &inexpr
->elts
[inend
],
1041 EXP_ELEM_TO_BYTES (oplen
));
1044 if (expout_last_struct
== inend
)
1045 result
= outbeg
- oplen
;
1047 /* Find the lengths of the arg subexpressions. */
1048 arglens
= (int *) alloca (args
* sizeof (int));
1049 for (i
= args
- 1; i
>= 0; i
--)
1051 oplen
= length_of_subexp (inexpr
, inend
);
1056 /* Now copy each subexpression, preserving the order of
1057 the subexpressions, but prefixifying each one.
1058 In this loop, inend starts at the beginning of
1059 the expression this level is working on
1060 and marches forward over the arguments.
1061 outbeg does similarly in the output. */
1062 for (i
= 0; i
< args
; i
++)
1068 r
= prefixify_subexp (inexpr
, outexpr
, inend
, outbeg
);
1071 /* Return immediately. We probably have only parsed a
1072 partial expression, so we don't want to try to reverse
1073 the other operands. */
1082 /* Read an expression from the string *STRINGPTR points to,
1083 parse it, and return a pointer to a struct expression that we malloc.
1084 Use block BLOCK as the lexical context for variable names;
1085 if BLOCK is zero, use the block of the selected stack frame.
1086 Meanwhile, advance *STRINGPTR to point after the expression,
1087 at the first nonwhite character that is not part of the expression
1088 (possibly a null character).
1090 If COMMA is nonzero, stop if a comma is reached. */
1093 parse_exp_1 (const char **stringptr
, CORE_ADDR pc
, const struct block
*block
,
1096 return parse_exp_in_context (stringptr
, pc
, block
, comma
, 0, NULL
);
1099 static expression_up
1100 parse_exp_in_context (const char **stringptr
, CORE_ADDR pc
,
1101 const struct block
*block
,
1102 int comma
, int void_context_p
, int *out_subexp
)
1104 return parse_exp_in_context_1 (stringptr
, pc
, block
, comma
,
1105 void_context_p
, out_subexp
);
1108 /* As for parse_exp_1, except that if VOID_CONTEXT_P, then
1109 no value is expected from the expression.
1110 OUT_SUBEXP is set when attempting to complete a field name; in this
1111 case it is set to the index of the subexpression on the
1112 left-hand-side of the struct op. If not doing such completion, it
1113 is left untouched. */
1115 static expression_up
1116 parse_exp_in_context_1 (const char **stringptr
, CORE_ADDR pc
,
1117 const struct block
*block
,
1118 int comma
, int void_context_p
, int *out_subexp
)
1120 const struct language_defn
*lang
= NULL
;
1121 struct parser_state ps
;
1124 lexptr
= *stringptr
;
1128 type_stack
.depth
= 0;
1129 expout_last_struct
= -1;
1130 expout_tag_completion_type
= TYPE_CODE_UNDEF
;
1131 xfree (expout_completion_name
);
1132 expout_completion_name
= NULL
;
1134 comma_terminates
= comma
;
1136 if (lexptr
== 0 || *lexptr
== 0)
1137 error_no_arg (_("expression to compute"));
1139 std::vector
<int> funcalls
;
1140 scoped_restore save_funcall_chain
= make_scoped_restore (&funcall_chain
,
1143 expression_context_block
= block
;
1145 /* If no context specified, try using the current frame, if any. */
1146 if (!expression_context_block
)
1147 expression_context_block
= get_selected_block (&expression_context_pc
);
1149 expression_context_pc
= BLOCK_START (expression_context_block
);
1151 expression_context_pc
= pc
;
1153 /* Fall back to using the current source static context, if any. */
1155 if (!expression_context_block
)
1157 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
1159 expression_context_block
1160 = BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (cursal
.symtab
),
1162 if (expression_context_block
)
1163 expression_context_pc
= BLOCK_START (expression_context_block
);
1166 if (language_mode
== language_mode_auto
&& block
!= NULL
)
1168 /* Find the language associated to the given context block.
1169 Default to the current language if it can not be determined.
1171 Note that using the language corresponding to the current frame
1172 can sometimes give unexpected results. For instance, this
1173 routine is often called several times during the inferior
1174 startup phase to re-parse breakpoint expressions after
1175 a new shared library has been loaded. The language associated
1176 to the current frame at this moment is not relevant for
1177 the breakpoint. Using it would therefore be silly, so it seems
1178 better to rely on the current language rather than relying on
1179 the current frame language to parse the expression. That's why
1180 we do the following language detection only if the context block
1181 has been specifically provided. */
1182 struct symbol
*func
= block_linkage_function (block
);
1185 lang
= language_def (SYMBOL_LANGUAGE (func
));
1186 if (lang
== NULL
|| lang
->la_language
== language_unknown
)
1187 lang
= current_language
;
1190 lang
= current_language
;
1192 /* get_current_arch may reset CURRENT_LANGUAGE via select_frame.
1193 While we need CURRENT_LANGUAGE to be set to LANG (for lookup_symbol
1194 and others called from *.y) ensure CURRENT_LANGUAGE gets restored
1195 to the value matching SELECTED_FRAME as set by get_current_arch. */
1197 initialize_expout (&ps
, 10, lang
, get_current_arch ());
1199 scoped_restore_current_language lang_saver
;
1200 set_language (lang
->la_language
);
1204 if (lang
->la_parser (&ps
))
1205 lang
->la_error (NULL
);
1207 CATCH (except
, RETURN_MASK_ALL
)
1209 if (! parse_completion
)
1212 throw_exception (except
);
1217 reallocate_expout (&ps
);
1219 /* Convert expression from postfix form as generated by yacc
1220 parser, to a prefix form. */
1222 if (expressiondebug
)
1223 dump_raw_expression (ps
.expout
, gdb_stdlog
,
1224 "before conversion to prefix form");
1226 subexp
= prefixify_expression (ps
.expout
);
1228 *out_subexp
= subexp
;
1230 lang
->la_post_parser (&ps
.expout
, void_context_p
);
1232 if (expressiondebug
)
1233 dump_prefix_expression (ps
.expout
, gdb_stdlog
);
1235 *stringptr
= lexptr
;
1236 return expression_up (ps
.expout
);
1239 /* Parse STRING as an expression, and complain if this fails
1240 to use up all of the contents of STRING. */
1243 parse_expression (const char *string
)
1245 expression_up exp
= parse_exp_1 (&string
, 0, 0, 0);
1247 error (_("Junk after end of expression."));
1251 /* Same as parse_expression, but using the given language (LANG)
1252 to parse the expression. */
1255 parse_expression_with_language (const char *string
, enum language lang
)
1257 gdb::optional
<scoped_restore_current_language
> lang_saver
;
1258 if (current_language
->la_language
!= lang
)
1260 lang_saver
.emplace ();
1261 set_language (lang
);
1264 return parse_expression (string
);
1267 /* Parse STRING as an expression. If parsing ends in the middle of a
1268 field reference, return the type of the left-hand-side of the
1269 reference; furthermore, if the parsing ends in the field name,
1270 return the field name in *NAME. If the parsing ends in the middle
1271 of a field reference, but the reference is somehow invalid, throw
1272 an exception. In all other cases, return NULL. Returned non-NULL
1273 *NAME must be freed by the caller. */
1276 parse_expression_for_completion (const char *string
, char **name
,
1277 enum type_code
*code
)
1285 parse_completion
= 1;
1286 exp
= parse_exp_in_context (&string
, 0, 0, 0, 0, &subexp
);
1288 CATCH (except
, RETURN_MASK_ERROR
)
1290 /* Nothing, EXP remains NULL. */
1294 parse_completion
= 0;
1298 if (expout_tag_completion_type
!= TYPE_CODE_UNDEF
)
1300 *code
= expout_tag_completion_type
;
1301 *name
= expout_completion_name
;
1302 expout_completion_name
= NULL
;
1306 if (expout_last_struct
== -1)
1309 *name
= extract_field_op (exp
.get (), &subexp
);
1313 /* This might throw an exception. If so, we want to let it
1315 val
= evaluate_subexpression_type (exp
.get (), subexp
);
1316 /* (*NAME) is a part of the EXP memory block freed below. */
1317 *name
= xstrdup (*name
);
1319 return value_type (val
);
1322 /* A post-parser that does nothing. */
1325 null_post_parser (struct expression
**exp
, int void_context_p
)
1329 /* Parse floating point value P of length LEN.
1330 Return false if invalid, true if valid.
1331 The successfully parsed number is stored in DATA in
1332 target format for floating-point type TYPE.
1334 NOTE: This accepts the floating point syntax that sscanf accepts. */
1337 parse_float (const char *p
, int len
,
1338 const struct type
*type
, gdb_byte
*data
)
1340 return target_float_from_string (data
, type
, std::string (p
, len
));
1343 /* Stuff for maintaining a stack of types. Currently just used by C, but
1344 probably useful for any language which declares its types "backwards". */
1346 /* Ensure that there are HOWMUCH open slots on the type stack STACK. */
1349 type_stack_reserve (struct type_stack
*stack
, int howmuch
)
1351 if (stack
->depth
+ howmuch
>= stack
->size
)
1354 if (stack
->size
< howmuch
)
1355 stack
->size
= howmuch
;
1356 stack
->elements
= XRESIZEVEC (union type_stack_elt
, stack
->elements
,
1361 /* Ensure that there is a single open slot in the global type stack. */
1364 check_type_stack_depth (void)
1366 type_stack_reserve (&type_stack
, 1);
1369 /* A helper function for insert_type and insert_type_address_space.
1370 This does work of expanding the type stack and inserting the new
1371 element, ELEMENT, into the stack at location SLOT. */
1374 insert_into_type_stack (int slot
, union type_stack_elt element
)
1376 check_type_stack_depth ();
1378 if (slot
< type_stack
.depth
)
1379 memmove (&type_stack
.elements
[slot
+ 1], &type_stack
.elements
[slot
],
1380 (type_stack
.depth
- slot
) * sizeof (union type_stack_elt
));
1381 type_stack
.elements
[slot
] = element
;
1385 /* Insert a new type, TP, at the bottom of the type stack. If TP is
1386 tp_pointer, tp_reference or tp_rvalue_reference, it is inserted at the
1387 bottom. If TP is a qualifier, it is inserted at slot 1 (just above a
1388 previous tp_pointer) if there is anything on the stack, or simply pushed
1389 if the stack is empty. Other values for TP are invalid. */
1392 insert_type (enum type_pieces tp
)
1394 union type_stack_elt element
;
1397 gdb_assert (tp
== tp_pointer
|| tp
== tp_reference
1398 || tp
== tp_rvalue_reference
|| tp
== tp_const
1399 || tp
== tp_volatile
);
1401 /* If there is anything on the stack (we know it will be a
1402 tp_pointer), insert the qualifier above it. Otherwise, simply
1403 push this on the top of the stack. */
1404 if (type_stack
.depth
&& (tp
== tp_const
|| tp
== tp_volatile
))
1410 insert_into_type_stack (slot
, element
);
1414 push_type (enum type_pieces tp
)
1416 check_type_stack_depth ();
1417 type_stack
.elements
[type_stack
.depth
++].piece
= tp
;
1421 push_type_int (int n
)
1423 check_type_stack_depth ();
1424 type_stack
.elements
[type_stack
.depth
++].int_val
= n
;
1427 /* Insert a tp_space_identifier and the corresponding address space
1428 value into the stack. STRING is the name of an address space, as
1429 recognized by address_space_name_to_int. If the stack is empty,
1430 the new elements are simply pushed. If the stack is not empty,
1431 this function assumes that the first item on the stack is a
1432 tp_pointer, and the new values are inserted above the first
1436 insert_type_address_space (struct parser_state
*pstate
, char *string
)
1438 union type_stack_elt element
;
1441 /* If there is anything on the stack (we know it will be a
1442 tp_pointer), insert the address space qualifier above it.
1443 Otherwise, simply push this on the top of the stack. */
1444 if (type_stack
.depth
)
1449 element
.piece
= tp_space_identifier
;
1450 insert_into_type_stack (slot
, element
);
1451 element
.int_val
= address_space_name_to_int (parse_gdbarch (pstate
),
1453 insert_into_type_stack (slot
, element
);
1459 if (type_stack
.depth
)
1460 return type_stack
.elements
[--type_stack
.depth
].piece
;
1467 if (type_stack
.depth
)
1468 return type_stack
.elements
[--type_stack
.depth
].int_val
;
1469 /* "Can't happen". */
1473 /* Pop a type list element from the global type stack. */
1475 static VEC (type_ptr
) *
1478 gdb_assert (type_stack
.depth
);
1479 return type_stack
.elements
[--type_stack
.depth
].typelist_val
;
1482 /* Pop a type_stack element from the global type stack. */
1484 static struct type_stack
*
1485 pop_type_stack (void)
1487 gdb_assert (type_stack
.depth
);
1488 return type_stack
.elements
[--type_stack
.depth
].stack_val
;
1491 /* Append the elements of the type stack FROM to the type stack TO.
1492 Always returns TO. */
1495 append_type_stack (struct type_stack
*to
, struct type_stack
*from
)
1497 type_stack_reserve (to
, from
->depth
);
1499 memcpy (&to
->elements
[to
->depth
], &from
->elements
[0],
1500 from
->depth
* sizeof (union type_stack_elt
));
1501 to
->depth
+= from
->depth
;
1506 /* Push the type stack STACK as an element on the global type stack. */
1509 push_type_stack (struct type_stack
*stack
)
1511 check_type_stack_depth ();
1512 type_stack
.elements
[type_stack
.depth
++].stack_val
= stack
;
1513 push_type (tp_type_stack
);
1516 /* Copy the global type stack into a newly allocated type stack and
1517 return it. The global stack is cleared. The returned type stack
1518 must be freed with type_stack_cleanup. */
1521 get_type_stack (void)
1523 struct type_stack
*result
= XNEW (struct type_stack
);
1525 *result
= type_stack
;
1526 type_stack
.depth
= 0;
1527 type_stack
.size
= 0;
1528 type_stack
.elements
= NULL
;
1533 /* A cleanup function that destroys a single type stack. */
1536 type_stack_cleanup (void *arg
)
1538 struct type_stack
*stack
= (struct type_stack
*) arg
;
1540 xfree (stack
->elements
);
1544 /* Push a function type with arguments onto the global type stack.
1545 LIST holds the argument types. If the final item in LIST is NULL,
1546 then the function will be varargs. */
1549 push_typelist (VEC (type_ptr
) *list
)
1551 check_type_stack_depth ();
1552 type_stack
.elements
[type_stack
.depth
++].typelist_val
= list
;
1553 push_type (tp_function_with_arguments
);
1556 /* Pop the type stack and return a type_instance_flags that
1557 corresponds the const/volatile qualifiers on the stack. This is
1558 called by the C++ parser when parsing methods types, and as such no
1559 other kind of type in the type stack is expected. */
1562 follow_type_instance_flags ()
1564 type_instance_flags flags
= 0;
1567 switch (pop_type ())
1572 flags
|= TYPE_INSTANCE_FLAG_CONST
;
1575 flags
|= TYPE_INSTANCE_FLAG_VOLATILE
;
1578 gdb_assert_not_reached ("unrecognized tp_ value in follow_types");
1583 /* Pop the type stack and return the type which corresponds to FOLLOW_TYPE
1584 as modified by all the stuff on the stack. */
1586 follow_types (struct type
*follow_type
)
1590 int make_volatile
= 0;
1591 int make_addr_space
= 0;
1595 switch (pop_type ())
1600 follow_type
= make_cv_type (make_const
,
1601 TYPE_VOLATILE (follow_type
),
1604 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1607 if (make_addr_space
)
1608 follow_type
= make_type_with_address_space (follow_type
,
1610 make_const
= make_volatile
= 0;
1611 make_addr_space
= 0;
1619 case tp_space_identifier
:
1620 make_addr_space
= pop_type_int ();
1623 follow_type
= lookup_pointer_type (follow_type
);
1625 follow_type
= make_cv_type (make_const
,
1626 TYPE_VOLATILE (follow_type
),
1629 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1632 if (make_addr_space
)
1633 follow_type
= make_type_with_address_space (follow_type
,
1635 make_const
= make_volatile
= 0;
1636 make_addr_space
= 0;
1639 follow_type
= lookup_lvalue_reference_type (follow_type
);
1640 goto process_reference
;
1641 case tp_rvalue_reference
:
1642 follow_type
= lookup_rvalue_reference_type (follow_type
);
1645 follow_type
= make_cv_type (make_const
,
1646 TYPE_VOLATILE (follow_type
),
1649 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1652 if (make_addr_space
)
1653 follow_type
= make_type_with_address_space (follow_type
,
1655 make_const
= make_volatile
= 0;
1656 make_addr_space
= 0;
1659 array_size
= pop_type_int ();
1660 /* FIXME-type-allocation: need a way to free this type when we are
1663 lookup_array_range_type (follow_type
,
1664 0, array_size
>= 0 ? array_size
- 1 : 0);
1666 TYPE_HIGH_BOUND_KIND (TYPE_INDEX_TYPE (follow_type
))
1670 /* FIXME-type-allocation: need a way to free this type when we are
1672 follow_type
= lookup_function_type (follow_type
);
1675 case tp_function_with_arguments
:
1677 VEC (type_ptr
) *args
= pop_typelist ();
1680 = lookup_function_type_with_arguments (follow_type
,
1681 VEC_length (type_ptr
, args
),
1682 VEC_address (type_ptr
,
1684 VEC_free (type_ptr
, args
);
1690 struct type_stack
*stack
= pop_type_stack ();
1691 /* Sort of ugly, but not really much worse than the
1693 struct type_stack save
= type_stack
;
1695 type_stack
= *stack
;
1696 follow_type
= follow_types (follow_type
);
1697 gdb_assert (type_stack
.depth
== 0);
1703 gdb_assert_not_reached ("unrecognized tp_ value in follow_types");
1708 /* This function avoids direct calls to fprintf
1709 in the parser generated debug code. */
1711 parser_fprintf (FILE *x
, const char *y
, ...)
1717 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1720 fprintf_unfiltered (gdb_stderr
, " Unknown FILE used.\n");
1721 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1726 /* Implementation of the exp_descriptor method operator_check. */
1729 operator_check_standard (struct expression
*exp
, int pos
,
1730 int (*objfile_func
) (struct objfile
*objfile
,
1734 const union exp_element
*const elts
= exp
->elts
;
1735 struct type
*type
= NULL
;
1736 struct objfile
*objfile
= NULL
;
1738 /* Extended operators should have been already handled by exp_descriptor
1739 iterate method of its specific language. */
1740 gdb_assert (elts
[pos
].opcode
< OP_EXTENDED0
);
1742 /* Track the callers of write_exp_elt_type for this table. */
1744 switch (elts
[pos
].opcode
)
1756 type
= elts
[pos
+ 1].type
;
1761 LONGEST arg
, nargs
= elts
[pos
+ 2].longconst
;
1763 for (arg
= 0; arg
< nargs
; arg
++)
1765 struct type
*type
= elts
[pos
+ 3 + arg
].type
;
1766 struct objfile
*objfile
= TYPE_OBJFILE (type
);
1768 if (objfile
&& (*objfile_func
) (objfile
, data
))
1776 const struct block
*const block
= elts
[pos
+ 1].block
;
1777 const struct symbol
*const symbol
= elts
[pos
+ 2].symbol
;
1779 /* Check objfile where the variable itself is placed.
1780 SYMBOL_OBJ_SECTION (symbol) may be NULL. */
1781 if ((*objfile_func
) (symbol_objfile (symbol
), data
))
1784 /* Check objfile where is placed the code touching the variable. */
1785 objfile
= lookup_objfile_from_block (block
);
1787 type
= SYMBOL_TYPE (symbol
);
1790 case OP_VAR_MSYM_VALUE
:
1791 objfile
= elts
[pos
+ 1].objfile
;
1795 /* Invoke callbacks for TYPE and OBJFILE if they were set as non-NULL. */
1797 if (type
&& TYPE_OBJFILE (type
)
1798 && (*objfile_func
) (TYPE_OBJFILE (type
), data
))
1800 if (objfile
&& (*objfile_func
) (objfile
, data
))
1806 /* Call OBJFILE_FUNC for any objfile found being referenced by EXP.
1807 OBJFILE_FUNC is never called with NULL OBJFILE. OBJFILE_FUNC get
1808 passed an arbitrary caller supplied DATA pointer. If OBJFILE_FUNC
1809 returns non-zero value then (any other) non-zero value is immediately
1810 returned to the caller. Otherwise zero is returned after iterating
1811 through whole EXP. */
1814 exp_iterate (struct expression
*exp
,
1815 int (*objfile_func
) (struct objfile
*objfile
, void *data
),
1820 for (endpos
= exp
->nelts
; endpos
> 0; )
1822 int pos
, args
, oplen
= 0;
1824 operator_length (exp
, endpos
, &oplen
, &args
);
1825 gdb_assert (oplen
> 0);
1827 pos
= endpos
- oplen
;
1828 if (exp
->language_defn
->la_exp_desc
->operator_check (exp
, pos
,
1829 objfile_func
, data
))
1838 /* Helper for exp_uses_objfile. */
1841 exp_uses_objfile_iter (struct objfile
*exp_objfile
, void *objfile_voidp
)
1843 struct objfile
*objfile
= (struct objfile
*) objfile_voidp
;
1845 if (exp_objfile
->separate_debug_objfile_backlink
)
1846 exp_objfile
= exp_objfile
->separate_debug_objfile_backlink
;
1848 return exp_objfile
== objfile
;
1851 /* Return 1 if EXP uses OBJFILE (and will become dangling when OBJFILE
1852 is unloaded), otherwise return 0. OBJFILE must not be a separate debug info
1856 exp_uses_objfile (struct expression
*exp
, struct objfile
*objfile
)
1858 gdb_assert (objfile
->separate_debug_objfile_backlink
== NULL
);
1860 return exp_iterate (exp
, exp_uses_objfile_iter
, objfile
);
1863 /* See definition in parser-defs.h. */
1866 increase_expout_size (struct parser_state
*ps
, size_t lenelt
)
1868 if ((ps
->expout_ptr
+ lenelt
) >= ps
->expout_size
)
1870 ps
->expout_size
= std::max (ps
->expout_size
* 2,
1871 ps
->expout_ptr
+ lenelt
+ 10);
1872 ps
->expout
= (struct expression
*)
1873 xrealloc (ps
->expout
, (sizeof (struct expression
)
1874 + EXP_ELEM_TO_BYTES (ps
->expout_size
)));
1879 _initialize_parse (void)
1881 type_stack
.size
= 0;
1882 type_stack
.depth
= 0;
1883 type_stack
.elements
= NULL
;
1885 add_setshow_zuinteger_cmd ("expression", class_maintenance
,
1887 _("Set expression debugging."),
1888 _("Show expression debugging."),
1889 _("When non-zero, the internal representation "
1890 "of expressions will be printed."),
1892 show_expressiondebug
,
1893 &setdebuglist
, &showdebuglist
);
1894 add_setshow_boolean_cmd ("parser", class_maintenance
,
1896 _("Set parser debugging."),
1897 _("Show parser debugging."),
1898 _("When non-zero, expression parser "
1899 "tracing will be enabled."),
1902 &setdebuglist
, &showdebuglist
);