1 /* Parse expressions for GDB.
3 Copyright (C) 1986-2018 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 innermost_block_tracker 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 /* Documented at it's declaration. */
127 innermost_block_tracker::update (const struct block
*b
,
128 innermost_block_tracker_types t
)
130 if ((m_types
& t
) != 0
131 && (m_innermost_block
== NULL
132 || contained_in (b
, m_innermost_block
)))
133 m_innermost_block
= b
;
136 /* Data structure for saving values of arglist_len for function calls whose
137 arguments contain other function calls. */
139 static std::vector
<int> *funcall_chain
;
141 /* Begin counting arguments for a function call,
142 saving the data about any containing call. */
147 funcall_chain
->push_back (arglist_len
);
151 /* Return the number of arguments in a function call just terminated,
152 and restore the data for the containing function call. */
157 int val
= arglist_len
;
158 arglist_len
= funcall_chain
->back ();
159 funcall_chain
->pop_back ();
165 /* See definition in parser-defs.h. */
167 parser_state::parser_state (size_t initial_size
,
168 const struct language_defn
*lang
,
169 struct gdbarch
*gdbarch
)
170 : expout_size (initial_size
),
171 expout (XNEWVAR (expression
,
173 + EXP_ELEM_TO_BYTES (expout_size
)))),
176 expout
->language_defn
= lang
;
177 expout
->gdbarch
= gdbarch
;
181 parser_state::release ()
183 /* Record the actual number of expression elements, and then
184 reallocate the expression memory so that we free up any
187 expout
->nelts
= expout_ptr
;
188 expout
.reset (XRESIZEVAR (expression
, expout
.release (),
190 + EXP_ELEM_TO_BYTES (expout_ptr
))));
192 return std::move (expout
);
195 /* This page contains the functions for adding data to the struct expression
196 being constructed. */
198 /* Add one element to the end of the expression. */
200 /* To avoid a bug in the Sun 4 compiler, we pass things that can fit into
201 a register through here. */
204 write_exp_elt (struct parser_state
*ps
, const union exp_element
*expelt
)
206 if (ps
->expout_ptr
>= ps
->expout_size
)
208 ps
->expout_size
*= 2;
209 ps
->expout
.reset (XRESIZEVAR (expression
, ps
->expout
.release (),
211 + EXP_ELEM_TO_BYTES (ps
->expout_size
))));
213 ps
->expout
->elts
[ps
->expout_ptr
++] = *expelt
;
217 write_exp_elt_opcode (struct parser_state
*ps
, enum exp_opcode expelt
)
219 union exp_element tmp
;
221 memset (&tmp
, 0, sizeof (union exp_element
));
223 write_exp_elt (ps
, &tmp
);
227 write_exp_elt_sym (struct parser_state
*ps
, struct symbol
*expelt
)
229 union exp_element tmp
;
231 memset (&tmp
, 0, sizeof (union exp_element
));
233 write_exp_elt (ps
, &tmp
);
237 write_exp_elt_msym (struct parser_state
*ps
, minimal_symbol
*expelt
)
239 union exp_element tmp
;
241 memset (&tmp
, 0, sizeof (union exp_element
));
242 tmp
.msymbol
= expelt
;
243 write_exp_elt (ps
, &tmp
);
247 write_exp_elt_block (struct parser_state
*ps
, const struct block
*b
)
249 union exp_element tmp
;
251 memset (&tmp
, 0, sizeof (union exp_element
));
253 write_exp_elt (ps
, &tmp
);
257 write_exp_elt_objfile (struct parser_state
*ps
, struct objfile
*objfile
)
259 union exp_element tmp
;
261 memset (&tmp
, 0, sizeof (union exp_element
));
262 tmp
.objfile
= objfile
;
263 write_exp_elt (ps
, &tmp
);
267 write_exp_elt_longcst (struct parser_state
*ps
, LONGEST expelt
)
269 union exp_element tmp
;
271 memset (&tmp
, 0, sizeof (union exp_element
));
272 tmp
.longconst
= expelt
;
273 write_exp_elt (ps
, &tmp
);
277 write_exp_elt_floatcst (struct parser_state
*ps
, const gdb_byte expelt
[16])
279 union exp_element tmp
;
282 for (index
= 0; index
< 16; index
++)
283 tmp
.floatconst
[index
] = expelt
[index
];
285 write_exp_elt (ps
, &tmp
);
289 write_exp_elt_type (struct parser_state
*ps
, struct type
*expelt
)
291 union exp_element tmp
;
293 memset (&tmp
, 0, sizeof (union exp_element
));
295 write_exp_elt (ps
, &tmp
);
299 write_exp_elt_intern (struct parser_state
*ps
, struct internalvar
*expelt
)
301 union exp_element tmp
;
303 memset (&tmp
, 0, sizeof (union exp_element
));
304 tmp
.internalvar
= expelt
;
305 write_exp_elt (ps
, &tmp
);
308 /* Add a string constant to the end of the expression.
310 String constants are stored by first writing an expression element
311 that contains the length of the string, then stuffing the string
312 constant itself into however many expression elements are needed
313 to hold it, and then writing another expression element that contains
314 the length of the string. I.e. an expression element at each end of
315 the string records the string length, so you can skip over the
316 expression elements containing the actual string bytes from either
317 end of the string. Note that this also allows gdb to handle
318 strings with embedded null bytes, as is required for some languages.
320 Don't be fooled by the fact that the string is null byte terminated,
321 this is strictly for the convenience of debugging gdb itself.
322 Gdb does not depend up the string being null terminated, since the
323 actual length is recorded in expression elements at each end of the
324 string. The null byte is taken into consideration when computing how
325 many expression elements are required to hold the string constant, of
330 write_exp_string (struct parser_state
*ps
, struct stoken str
)
332 int len
= str
.length
;
336 /* Compute the number of expression elements required to hold the string
337 (including a null byte terminator), along with one expression element
338 at each end to record the actual string length (not including the
339 null byte terminator). */
341 lenelt
= 2 + BYTES_TO_EXP_ELEM (len
+ 1);
343 increase_expout_size (ps
, lenelt
);
345 /* Write the leading length expression element (which advances the current
346 expression element index), then write the string constant followed by a
347 terminating null byte, and then write the trailing length expression
350 write_exp_elt_longcst (ps
, (LONGEST
) len
);
351 strdata
= (char *) &ps
->expout
->elts
[ps
->expout_ptr
];
352 memcpy (strdata
, str
.ptr
, len
);
353 *(strdata
+ len
) = '\0';
354 ps
->expout_ptr
+= lenelt
- 2;
355 write_exp_elt_longcst (ps
, (LONGEST
) len
);
358 /* Add a vector of string constants to the end of the expression.
360 This adds an OP_STRING operation, but encodes the contents
361 differently from write_exp_string. The language is expected to
362 handle evaluation of this expression itself.
364 After the usual OP_STRING header, TYPE is written into the
365 expression as a long constant. The interpretation of this field is
366 up to the language evaluator.
368 Next, each string in VEC is written. The length is written as a
369 long constant, followed by the contents of the string. */
372 write_exp_string_vector (struct parser_state
*ps
, int type
,
373 struct stoken_vector
*vec
)
378 /* Compute the size. We compute the size in number of slots to
379 avoid issues with string padding. */
381 for (i
= 0; i
< vec
->len
; ++i
)
383 /* One slot for the length of this element, plus the number of
384 slots needed for this string. */
385 n_slots
+= 1 + BYTES_TO_EXP_ELEM (vec
->tokens
[i
].length
);
388 /* One more slot for the type of the string. */
391 /* Now compute a phony string length. */
392 len
= EXP_ELEM_TO_BYTES (n_slots
) - 1;
395 increase_expout_size (ps
, n_slots
);
397 write_exp_elt_opcode (ps
, OP_STRING
);
398 write_exp_elt_longcst (ps
, len
);
399 write_exp_elt_longcst (ps
, type
);
401 for (i
= 0; i
< vec
->len
; ++i
)
403 write_exp_elt_longcst (ps
, vec
->tokens
[i
].length
);
404 memcpy (&ps
->expout
->elts
[ps
->expout_ptr
], vec
->tokens
[i
].ptr
,
405 vec
->tokens
[i
].length
);
406 ps
->expout_ptr
+= BYTES_TO_EXP_ELEM (vec
->tokens
[i
].length
);
409 write_exp_elt_longcst (ps
, len
);
410 write_exp_elt_opcode (ps
, OP_STRING
);
413 /* Add a bitstring constant to the end of the expression.
415 Bitstring constants are stored by first writing an expression element
416 that contains the length of the bitstring (in bits), then stuffing the
417 bitstring constant itself into however many expression elements are
418 needed to hold it, and then writing another expression element that
419 contains the length of the bitstring. I.e. an expression element at
420 each end of the bitstring records the bitstring length, so you can skip
421 over the expression elements containing the actual bitstring bytes from
422 either end of the bitstring. */
425 write_exp_bitstring (struct parser_state
*ps
, struct stoken str
)
427 int bits
= str
.length
; /* length in bits */
428 int len
= (bits
+ HOST_CHAR_BIT
- 1) / HOST_CHAR_BIT
;
432 /* Compute the number of expression elements required to hold the bitstring,
433 along with one expression element at each end to record the actual
434 bitstring length in bits. */
436 lenelt
= 2 + BYTES_TO_EXP_ELEM (len
);
438 increase_expout_size (ps
, lenelt
);
440 /* Write the leading length expression element (which advances the current
441 expression element index), then write the bitstring constant, and then
442 write the trailing length expression element. */
444 write_exp_elt_longcst (ps
, (LONGEST
) bits
);
445 strdata
= (char *) &ps
->expout
->elts
[ps
->expout_ptr
];
446 memcpy (strdata
, str
.ptr
, len
);
447 ps
->expout_ptr
+= lenelt
- 2;
448 write_exp_elt_longcst (ps
, (LONGEST
) bits
);
451 /* Return the type of MSYMBOL, a minimal symbol of OBJFILE. If
452 ADDRESS_P is not NULL, set it to the MSYMBOL's resolved
456 find_minsym_type_and_address (minimal_symbol
*msymbol
,
457 struct objfile
*objfile
,
458 CORE_ADDR
*address_p
)
460 bound_minimal_symbol bound_msym
= {msymbol
, objfile
};
461 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
462 struct obj_section
*section
= MSYMBOL_OBJ_SECTION (objfile
, msymbol
);
463 enum minimal_symbol_type type
= MSYMBOL_TYPE (msymbol
);
466 bool is_tls
= (section
!= NULL
467 && section
->the_bfd_section
->flags
& SEC_THREAD_LOCAL
);
469 /* Addresses of TLS symbols are really offsets into a
470 per-objfile/per-thread storage block. */
471 CORE_ADDR addr
= (is_tls
472 ? MSYMBOL_VALUE_RAW_ADDRESS (bound_msym
.minsym
)
473 : BMSYMBOL_VALUE_ADDRESS (bound_msym
));
475 /* The minimal symbol might point to a function descriptor;
476 resolve it to the actual code address instead. */
477 pc
= gdbarch_convert_from_func_ptr_addr (gdbarch
, addr
, ¤t_target
);
480 struct bound_minimal_symbol ifunc_msym
= lookup_minimal_symbol_by_pc (pc
);
482 /* In this case, assume we have a code symbol instead of
485 if (ifunc_msym
.minsym
!= NULL
486 && MSYMBOL_TYPE (ifunc_msym
.minsym
) == mst_text_gnu_ifunc
487 && BMSYMBOL_VALUE_ADDRESS (ifunc_msym
) == pc
)
489 /* A function descriptor has been resolved but PC is still in the
490 STT_GNU_IFUNC resolver body (such as because inferior does not
491 run to be able to call it). */
493 type
= mst_text_gnu_ifunc
;
501 if (overlay_debugging
)
502 addr
= symbol_overlayed_address (addr
, section
);
506 /* Skip translation if caller does not need the address. */
507 if (address_p
!= NULL
)
508 *address_p
= target_translate_tls_address (objfile
, addr
);
509 return objfile_type (objfile
)->nodebug_tls_symbol
;
512 if (address_p
!= NULL
)
519 case mst_solib_trampoline
:
520 return objfile_type (objfile
)->nodebug_text_symbol
;
522 case mst_text_gnu_ifunc
:
523 return objfile_type (objfile
)->nodebug_text_gnu_ifunc_symbol
;
529 return objfile_type (objfile
)->nodebug_data_symbol
;
531 case mst_slot_got_plt
:
532 return objfile_type (objfile
)->nodebug_got_plt_symbol
;
535 return objfile_type (objfile
)->nodebug_unknown_symbol
;
539 /* Add the appropriate elements for a minimal symbol to the end of
543 write_exp_msymbol (struct parser_state
*ps
,
544 struct bound_minimal_symbol bound_msym
)
546 write_exp_elt_opcode (ps
, OP_VAR_MSYM_VALUE
);
547 write_exp_elt_objfile (ps
, bound_msym
.objfile
);
548 write_exp_elt_msym (ps
, bound_msym
.minsym
);
549 write_exp_elt_opcode (ps
, OP_VAR_MSYM_VALUE
);
552 /* Mark the current index as the starting location of a structure
553 expression. This is used when completing on field names. */
556 mark_struct_expression (struct parser_state
*ps
)
558 gdb_assert (parse_completion
559 && expout_tag_completion_type
== TYPE_CODE_UNDEF
);
560 expout_last_struct
= ps
->expout_ptr
;
563 /* Indicate that the current parser invocation is completing a tag.
564 TAG is the type code of the tag, and PTR and LENGTH represent the
565 start of the tag name. */
568 mark_completion_tag (enum type_code tag
, const char *ptr
, int length
)
570 gdb_assert (parse_completion
571 && expout_tag_completion_type
== TYPE_CODE_UNDEF
572 && expout_completion_name
== NULL
573 && expout_last_struct
== -1);
574 gdb_assert (tag
== TYPE_CODE_UNION
575 || tag
== TYPE_CODE_STRUCT
576 || tag
== TYPE_CODE_ENUM
);
577 expout_tag_completion_type
= tag
;
578 expout_completion_name
= (char *) xmalloc (length
+ 1);
579 memcpy (expout_completion_name
, ptr
, length
);
580 expout_completion_name
[length
] = '\0';
584 /* Recognize tokens that start with '$'. These include:
586 $regname A native register name or a "standard
589 $variable A convenience variable with a name chosen
592 $digits Value history with index <digits>, starting
593 from the first value which has index 1.
595 $$digits Value history with index <digits> relative
596 to the last value. I.e. $$0 is the last
597 value, $$1 is the one previous to that, $$2
598 is the one previous to $$1, etc.
600 $ | $0 | $$0 The last value in the value history.
602 $$ An abbreviation for the second to the last
603 value in the value history, I.e. $$1 */
606 write_dollar_variable (struct parser_state
*ps
, struct stoken str
)
608 struct block_symbol sym
;
609 struct bound_minimal_symbol msym
;
610 struct internalvar
*isym
= NULL
;
612 /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1)
613 and $$digits (equivalent to $<-digits> if you could type that). */
617 /* Double dollar means negate the number and add -1 as well.
618 Thus $$ alone means -1. */
619 if (str
.length
>= 2 && str
.ptr
[1] == '$')
626 /* Just dollars (one or two). */
630 /* Is the rest of the token digits? */
631 for (; i
< str
.length
; i
++)
632 if (!(str
.ptr
[i
] >= '0' && str
.ptr
[i
] <= '9'))
636 i
= atoi (str
.ptr
+ 1 + negate
);
642 /* Handle tokens that refer to machine registers:
643 $ followed by a register name. */
644 i
= user_reg_map_name_to_regnum (parse_gdbarch (ps
),
645 str
.ptr
+ 1, str
.length
- 1);
647 goto handle_register
;
649 /* Any names starting with $ are probably debugger internal variables. */
651 isym
= lookup_only_internalvar (copy_name (str
) + 1);
654 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
655 write_exp_elt_intern (ps
, isym
);
656 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
660 /* On some systems, such as HP-UX and hppa-linux, certain system routines
661 have names beginning with $ or $$. Check for those, first. */
663 sym
= lookup_symbol (copy_name (str
), (struct block
*) NULL
,
667 write_exp_elt_opcode (ps
, OP_VAR_VALUE
);
668 write_exp_elt_block (ps
, sym
.block
);
669 write_exp_elt_sym (ps
, sym
.symbol
);
670 write_exp_elt_opcode (ps
, OP_VAR_VALUE
);
673 msym
= lookup_bound_minimal_symbol (copy_name (str
));
676 write_exp_msymbol (ps
, msym
);
680 /* Any other names are assumed to be debugger internal variables. */
682 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
683 write_exp_elt_intern (ps
, create_internalvar (copy_name (str
) + 1));
684 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
687 write_exp_elt_opcode (ps
, OP_LAST
);
688 write_exp_elt_longcst (ps
, (LONGEST
) i
);
689 write_exp_elt_opcode (ps
, OP_LAST
);
692 write_exp_elt_opcode (ps
, OP_REGISTER
);
695 write_exp_string (ps
, str
);
696 write_exp_elt_opcode (ps
, OP_REGISTER
);
697 innermost_block
.update (expression_context_block
,
698 INNERMOST_BLOCK_FOR_REGISTERS
);
704 find_template_name_end (const char *p
)
707 int just_seen_right
= 0;
708 int just_seen_colon
= 0;
709 int just_seen_space
= 0;
711 if (!p
|| (*p
!= '<'))
722 /* In future, may want to allow these?? */
725 depth
++; /* start nested template */
726 if (just_seen_colon
|| just_seen_right
|| just_seen_space
)
727 return 0; /* but not after : or :: or > or space */
730 if (just_seen_colon
|| just_seen_right
)
731 return 0; /* end a (nested?) template */
732 just_seen_right
= 1; /* but not after : or :: */
733 if (--depth
== 0) /* also disallow >>, insist on > > */
734 return ++p
; /* if outermost ended, return */
737 if (just_seen_space
|| (just_seen_colon
> 1))
738 return 0; /* nested class spec coming up */
739 just_seen_colon
++; /* we allow :: but not :::: */
744 if (!((*p
>= 'a' && *p
<= 'z') || /* allow token chars */
745 (*p
>= 'A' && *p
<= 'Z') ||
746 (*p
>= '0' && *p
<= '9') ||
747 (*p
== '_') || (*p
== ',') || /* commas for template args */
748 (*p
== '&') || (*p
== '*') || /* pointer and ref types */
749 (*p
== '(') || (*p
== ')') || /* function types */
750 (*p
== '[') || (*p
== ']'))) /* array types */
764 /* Return a null-terminated temporary copy of the name of a string token.
766 Tokens that refer to names do so with explicit pointer and length,
767 so they can share the storage that lexptr is parsing.
768 When it is necessary to pass a name to a function that expects
769 a null-terminated string, the substring is copied out
770 into a separate block of storage.
772 N.B. A single buffer is reused on each call. */
775 copy_name (struct stoken token
)
777 /* A temporary buffer for identifiers, so we can null-terminate them.
778 We allocate this with xrealloc. parse_exp_1 used to allocate with
779 alloca, using the size of the whole expression as a conservative
780 estimate of the space needed. However, macro expansion can
781 introduce names longer than the original expression; there's no
782 practical way to know beforehand how large that might be. */
783 static char *namecopy
;
784 static size_t namecopy_size
;
786 /* Make sure there's enough space for the token. */
787 if (namecopy_size
< token
.length
+ 1)
789 namecopy_size
= token
.length
+ 1;
790 namecopy
= (char *) xrealloc (namecopy
, token
.length
+ 1);
793 memcpy (namecopy
, token
.ptr
, token
.length
);
794 namecopy
[token
.length
] = 0;
800 /* See comments on parser-defs.h. */
803 prefixify_expression (struct expression
*expr
)
805 int len
= sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expr
->nelts
);
806 struct expression
*temp
;
807 int inpos
= expr
->nelts
, outpos
= 0;
809 temp
= (struct expression
*) alloca (len
);
811 /* Copy the original expression into temp. */
812 memcpy (temp
, expr
, len
);
814 return prefixify_subexp (temp
, expr
, inpos
, outpos
);
817 /* Return the number of exp_elements in the postfix subexpression
818 of EXPR whose operator is at index ENDPOS - 1 in EXPR. */
821 length_of_subexp (struct expression
*expr
, int endpos
)
825 operator_length (expr
, endpos
, &oplen
, &args
);
829 oplen
+= length_of_subexp (expr
, endpos
- oplen
);
836 /* Sets *OPLENP to the length of the operator whose (last) index is
837 ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that
841 operator_length (const struct expression
*expr
, int endpos
, int *oplenp
,
844 expr
->language_defn
->la_exp_desc
->operator_length (expr
, endpos
,
848 /* Default value for operator_length in exp_descriptor vectors. */
851 operator_length_standard (const struct expression
*expr
, int endpos
,
852 int *oplenp
, int *argsp
)
856 enum range_type range_type
;
860 error (_("?error in operator_length_standard"));
862 i
= (int) expr
->elts
[endpos
- 1].opcode
;
868 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
869 oplen
= 5 + BYTES_TO_EXP_ELEM (oplen
+ 1);
875 case OP_VAR_MSYM_VALUE
:
879 case OP_FUNC_STATIC_VAR
:
880 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
881 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
889 case OP_VAR_ENTRY_VALUE
:
899 case OP_F77_UNDETERMINED_ARGLIST
:
901 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
905 oplen
= 5 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
909 case OP_OBJC_MSGCALL
: /* Objective C message (method) call. */
911 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
920 case UNOP_DYNAMIC_CAST
:
921 case UNOP_REINTERPRET_CAST
:
922 case UNOP_MEMVAL_TYPE
:
950 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
951 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
956 case STRUCTOP_STRUCT
:
963 case OP_OBJC_NSSTRING
: /* Objective C Foundation Class
964 NSString constant. */
965 case OP_OBJC_SELECTOR
: /* Objective C "@selector" pseudo-op. */
967 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
968 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
973 args
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
974 args
-= longest_to_int (expr
->elts
[endpos
- 3].longconst
);
984 case MULTI_SUBSCRIPT
:
986 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
989 case BINOP_ASSIGN_MODIFY
:
1001 range_type
= (enum range_type
)
1002 longest_to_int (expr
->elts
[endpos
- 2].longconst
);
1006 case LOW_BOUND_DEFAULT
:
1007 case HIGH_BOUND_DEFAULT
:
1010 case BOTH_BOUND_DEFAULT
:
1013 case NONE_BOUND_DEFAULT
:
1021 args
= 1 + (i
< (int) BINOP_END
);
1028 /* Copy the subexpression ending just before index INEND in INEXPR
1029 into OUTEXPR, starting at index OUTBEG.
1030 In the process, convert it from suffix to prefix form.
1031 If EXPOUT_LAST_STRUCT is -1, then this function always returns -1.
1032 Otherwise, it returns the index of the subexpression which is the
1033 left-hand-side of the expression at EXPOUT_LAST_STRUCT. */
1036 prefixify_subexp (struct expression
*inexpr
,
1037 struct expression
*outexpr
, int inend
, int outbeg
)
1045 operator_length (inexpr
, inend
, &oplen
, &args
);
1047 /* Copy the final operator itself, from the end of the input
1048 to the beginning of the output. */
1050 memcpy (&outexpr
->elts
[outbeg
], &inexpr
->elts
[inend
],
1051 EXP_ELEM_TO_BYTES (oplen
));
1054 if (expout_last_struct
== inend
)
1055 result
= outbeg
- oplen
;
1057 /* Find the lengths of the arg subexpressions. */
1058 arglens
= (int *) alloca (args
* sizeof (int));
1059 for (i
= args
- 1; i
>= 0; i
--)
1061 oplen
= length_of_subexp (inexpr
, inend
);
1066 /* Now copy each subexpression, preserving the order of
1067 the subexpressions, but prefixifying each one.
1068 In this loop, inend starts at the beginning of
1069 the expression this level is working on
1070 and marches forward over the arguments.
1071 outbeg does similarly in the output. */
1072 for (i
= 0; i
< args
; i
++)
1078 r
= prefixify_subexp (inexpr
, outexpr
, inend
, outbeg
);
1081 /* Return immediately. We probably have only parsed a
1082 partial expression, so we don't want to try to reverse
1083 the other operands. */
1092 /* Read an expression from the string *STRINGPTR points to,
1093 parse it, and return a pointer to a struct expression that we malloc.
1094 Use block BLOCK as the lexical context for variable names;
1095 if BLOCK is zero, use the block of the selected stack frame.
1096 Meanwhile, advance *STRINGPTR to point after the expression,
1097 at the first nonwhite character that is not part of the expression
1098 (possibly a null character).
1100 If COMMA is nonzero, stop if a comma is reached. */
1103 parse_exp_1 (const char **stringptr
, CORE_ADDR pc
, const struct block
*block
,
1106 return parse_exp_in_context (stringptr
, pc
, block
, comma
, 0, NULL
);
1109 static expression_up
1110 parse_exp_in_context (const char **stringptr
, CORE_ADDR pc
,
1111 const struct block
*block
,
1112 int comma
, int void_context_p
, int *out_subexp
)
1114 return parse_exp_in_context_1 (stringptr
, pc
, block
, comma
,
1115 void_context_p
, out_subexp
);
1118 /* As for parse_exp_1, except that if VOID_CONTEXT_P, then
1119 no value is expected from the expression.
1120 OUT_SUBEXP is set when attempting to complete a field name; in this
1121 case it is set to the index of the subexpression on the
1122 left-hand-side of the struct op. If not doing such completion, it
1123 is left untouched. */
1125 static expression_up
1126 parse_exp_in_context_1 (const char **stringptr
, CORE_ADDR pc
,
1127 const struct block
*block
,
1128 int comma
, int void_context_p
, int *out_subexp
)
1130 const struct language_defn
*lang
= NULL
;
1133 lexptr
= *stringptr
;
1137 type_stack
.depth
= 0;
1138 expout_last_struct
= -1;
1139 expout_tag_completion_type
= TYPE_CODE_UNDEF
;
1140 xfree (expout_completion_name
);
1141 expout_completion_name
= NULL
;
1143 comma_terminates
= comma
;
1145 if (lexptr
== 0 || *lexptr
== 0)
1146 error_no_arg (_("expression to compute"));
1148 std::vector
<int> funcalls
;
1149 scoped_restore save_funcall_chain
= make_scoped_restore (&funcall_chain
,
1152 expression_context_block
= block
;
1154 /* If no context specified, try using the current frame, if any. */
1155 if (!expression_context_block
)
1156 expression_context_block
= get_selected_block (&expression_context_pc
);
1158 expression_context_pc
= BLOCK_START (expression_context_block
);
1160 expression_context_pc
= pc
;
1162 /* Fall back to using the current source static context, if any. */
1164 if (!expression_context_block
)
1166 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
1168 expression_context_block
1169 = BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (cursal
.symtab
),
1171 if (expression_context_block
)
1172 expression_context_pc
= BLOCK_START (expression_context_block
);
1175 if (language_mode
== language_mode_auto
&& block
!= NULL
)
1177 /* Find the language associated to the given context block.
1178 Default to the current language if it can not be determined.
1180 Note that using the language corresponding to the current frame
1181 can sometimes give unexpected results. For instance, this
1182 routine is often called several times during the inferior
1183 startup phase to re-parse breakpoint expressions after
1184 a new shared library has been loaded. The language associated
1185 to the current frame at this moment is not relevant for
1186 the breakpoint. Using it would therefore be silly, so it seems
1187 better to rely on the current language rather than relying on
1188 the current frame language to parse the expression. That's why
1189 we do the following language detection only if the context block
1190 has been specifically provided. */
1191 struct symbol
*func
= block_linkage_function (block
);
1194 lang
= language_def (SYMBOL_LANGUAGE (func
));
1195 if (lang
== NULL
|| lang
->la_language
== language_unknown
)
1196 lang
= current_language
;
1199 lang
= current_language
;
1201 /* get_current_arch may reset CURRENT_LANGUAGE via select_frame.
1202 While we need CURRENT_LANGUAGE to be set to LANG (for lookup_symbol
1203 and others called from *.y) ensure CURRENT_LANGUAGE gets restored
1204 to the value matching SELECTED_FRAME as set by get_current_arch. */
1206 parser_state
ps (10, lang
, get_current_arch ());
1208 scoped_restore_current_language lang_saver
;
1209 set_language (lang
->la_language
);
1213 if (lang
->la_parser (&ps
))
1214 lang
->la_error (NULL
);
1216 CATCH (except
, RETURN_MASK_ALL
)
1218 if (! parse_completion
)
1219 throw_exception (except
);
1223 /* We have to operate on an "expression *", due to la_post_parser,
1224 which explains this funny-looking double release. */
1225 expression_up result
= ps
.release ();
1227 /* Convert expression from postfix form as generated by yacc
1228 parser, to a prefix form. */
1230 if (expressiondebug
)
1231 dump_raw_expression (result
.get (), gdb_stdlog
,
1232 "before conversion to prefix form");
1234 subexp
= prefixify_expression (result
.get ());
1236 *out_subexp
= subexp
;
1238 lang
->la_post_parser (&result
, void_context_p
);
1240 if (expressiondebug
)
1241 dump_prefix_expression (result
.get (), gdb_stdlog
);
1243 *stringptr
= lexptr
;
1247 /* Parse STRING as an expression, and complain if this fails
1248 to use up all of the contents of STRING. */
1251 parse_expression (const char *string
)
1253 expression_up exp
= parse_exp_1 (&string
, 0, 0, 0);
1255 error (_("Junk after end of expression."));
1259 /* Same as parse_expression, but using the given language (LANG)
1260 to parse the expression. */
1263 parse_expression_with_language (const char *string
, enum language lang
)
1265 gdb::optional
<scoped_restore_current_language
> lang_saver
;
1266 if (current_language
->la_language
!= lang
)
1268 lang_saver
.emplace ();
1269 set_language (lang
);
1272 return parse_expression (string
);
1275 /* Parse STRING as an expression. If parsing ends in the middle of a
1276 field reference, return the type of the left-hand-side of the
1277 reference; furthermore, if the parsing ends in the field name,
1278 return the field name in *NAME. If the parsing ends in the middle
1279 of a field reference, but the reference is somehow invalid, throw
1280 an exception. In all other cases, return NULL. Returned non-NULL
1281 *NAME must be freed by the caller. */
1284 parse_expression_for_completion (const char *string
, char **name
,
1285 enum type_code
*code
)
1293 parse_completion
= 1;
1294 exp
= parse_exp_in_context (&string
, 0, 0, 0, 0, &subexp
);
1296 CATCH (except
, RETURN_MASK_ERROR
)
1298 /* Nothing, EXP remains NULL. */
1302 parse_completion
= 0;
1306 if (expout_tag_completion_type
!= TYPE_CODE_UNDEF
)
1308 *code
= expout_tag_completion_type
;
1309 *name
= expout_completion_name
;
1310 expout_completion_name
= NULL
;
1314 if (expout_last_struct
== -1)
1317 *name
= extract_field_op (exp
.get (), &subexp
);
1321 /* This might throw an exception. If so, we want to let it
1323 val
= evaluate_subexpression_type (exp
.get (), subexp
);
1324 /* (*NAME) is a part of the EXP memory block freed below. */
1325 *name
= xstrdup (*name
);
1327 return value_type (val
);
1330 /* A post-parser that does nothing. */
1333 null_post_parser (expression_up
*exp
, int void_context_p
)
1337 /* Parse floating point value P of length LEN.
1338 Return false if invalid, true if valid.
1339 The successfully parsed number is stored in DATA in
1340 target format for floating-point type TYPE.
1342 NOTE: This accepts the floating point syntax that sscanf accepts. */
1345 parse_float (const char *p
, int len
,
1346 const struct type
*type
, gdb_byte
*data
)
1348 return target_float_from_string (data
, type
, std::string (p
, len
));
1351 /* Stuff for maintaining a stack of types. Currently just used by C, but
1352 probably useful for any language which declares its types "backwards". */
1354 /* Ensure that there are HOWMUCH open slots on the type stack STACK. */
1357 type_stack_reserve (struct type_stack
*stack
, int howmuch
)
1359 if (stack
->depth
+ howmuch
>= stack
->size
)
1362 if (stack
->size
< howmuch
)
1363 stack
->size
= howmuch
;
1364 stack
->elements
= XRESIZEVEC (union type_stack_elt
, stack
->elements
,
1369 /* Ensure that there is a single open slot in the global type stack. */
1372 check_type_stack_depth (void)
1374 type_stack_reserve (&type_stack
, 1);
1377 /* A helper function for insert_type and insert_type_address_space.
1378 This does work of expanding the type stack and inserting the new
1379 element, ELEMENT, into the stack at location SLOT. */
1382 insert_into_type_stack (int slot
, union type_stack_elt element
)
1384 check_type_stack_depth ();
1386 if (slot
< type_stack
.depth
)
1387 memmove (&type_stack
.elements
[slot
+ 1], &type_stack
.elements
[slot
],
1388 (type_stack
.depth
- slot
) * sizeof (union type_stack_elt
));
1389 type_stack
.elements
[slot
] = element
;
1393 /* Insert a new type, TP, at the bottom of the type stack. If TP is
1394 tp_pointer, tp_reference or tp_rvalue_reference, it is inserted at the
1395 bottom. If TP is a qualifier, it is inserted at slot 1 (just above a
1396 previous tp_pointer) if there is anything on the stack, or simply pushed
1397 if the stack is empty. Other values for TP are invalid. */
1400 insert_type (enum type_pieces tp
)
1402 union type_stack_elt element
;
1405 gdb_assert (tp
== tp_pointer
|| tp
== tp_reference
1406 || tp
== tp_rvalue_reference
|| tp
== tp_const
1407 || tp
== tp_volatile
);
1409 /* If there is anything on the stack (we know it will be a
1410 tp_pointer), insert the qualifier above it. Otherwise, simply
1411 push this on the top of the stack. */
1412 if (type_stack
.depth
&& (tp
== tp_const
|| tp
== tp_volatile
))
1418 insert_into_type_stack (slot
, element
);
1422 push_type (enum type_pieces tp
)
1424 check_type_stack_depth ();
1425 type_stack
.elements
[type_stack
.depth
++].piece
= tp
;
1429 push_type_int (int n
)
1431 check_type_stack_depth ();
1432 type_stack
.elements
[type_stack
.depth
++].int_val
= n
;
1435 /* Insert a tp_space_identifier and the corresponding address space
1436 value into the stack. STRING is the name of an address space, as
1437 recognized by address_space_name_to_int. If the stack is empty,
1438 the new elements are simply pushed. If the stack is not empty,
1439 this function assumes that the first item on the stack is a
1440 tp_pointer, and the new values are inserted above the first
1444 insert_type_address_space (struct parser_state
*pstate
, char *string
)
1446 union type_stack_elt element
;
1449 /* If there is anything on the stack (we know it will be a
1450 tp_pointer), insert the address space qualifier above it.
1451 Otherwise, simply push this on the top of the stack. */
1452 if (type_stack
.depth
)
1457 element
.piece
= tp_space_identifier
;
1458 insert_into_type_stack (slot
, element
);
1459 element
.int_val
= address_space_name_to_int (parse_gdbarch (pstate
),
1461 insert_into_type_stack (slot
, element
);
1467 if (type_stack
.depth
)
1468 return type_stack
.elements
[--type_stack
.depth
].piece
;
1475 if (type_stack
.depth
)
1476 return type_stack
.elements
[--type_stack
.depth
].int_val
;
1477 /* "Can't happen". */
1481 /* Pop a type list element from the global type stack. */
1483 static VEC (type_ptr
) *
1486 gdb_assert (type_stack
.depth
);
1487 return type_stack
.elements
[--type_stack
.depth
].typelist_val
;
1490 /* Pop a type_stack element from the global type stack. */
1492 static struct type_stack
*
1493 pop_type_stack (void)
1495 gdb_assert (type_stack
.depth
);
1496 return type_stack
.elements
[--type_stack
.depth
].stack_val
;
1499 /* Append the elements of the type stack FROM to the type stack TO.
1500 Always returns TO. */
1503 append_type_stack (struct type_stack
*to
, struct type_stack
*from
)
1505 type_stack_reserve (to
, from
->depth
);
1507 memcpy (&to
->elements
[to
->depth
], &from
->elements
[0],
1508 from
->depth
* sizeof (union type_stack_elt
));
1509 to
->depth
+= from
->depth
;
1514 /* Push the type stack STACK as an element on the global type stack. */
1517 push_type_stack (struct type_stack
*stack
)
1519 check_type_stack_depth ();
1520 type_stack
.elements
[type_stack
.depth
++].stack_val
= stack
;
1521 push_type (tp_type_stack
);
1524 /* Copy the global type stack into a newly allocated type stack and
1525 return it. The global stack is cleared. The returned type stack
1526 must be freed with type_stack_cleanup. */
1529 get_type_stack (void)
1531 struct type_stack
*result
= XNEW (struct type_stack
);
1533 *result
= type_stack
;
1534 type_stack
.depth
= 0;
1535 type_stack
.size
= 0;
1536 type_stack
.elements
= NULL
;
1541 /* A cleanup function that destroys a single type stack. */
1544 type_stack_cleanup (void *arg
)
1546 struct type_stack
*stack
= (struct type_stack
*) arg
;
1548 xfree (stack
->elements
);
1552 /* Push a function type with arguments onto the global type stack.
1553 LIST holds the argument types. If the final item in LIST is NULL,
1554 then the function will be varargs. */
1557 push_typelist (VEC (type_ptr
) *list
)
1559 check_type_stack_depth ();
1560 type_stack
.elements
[type_stack
.depth
++].typelist_val
= list
;
1561 push_type (tp_function_with_arguments
);
1564 /* Pop the type stack and return a type_instance_flags that
1565 corresponds the const/volatile qualifiers on the stack. This is
1566 called by the C++ parser when parsing methods types, and as such no
1567 other kind of type in the type stack is expected. */
1570 follow_type_instance_flags ()
1572 type_instance_flags flags
= 0;
1575 switch (pop_type ())
1580 flags
|= TYPE_INSTANCE_FLAG_CONST
;
1583 flags
|= TYPE_INSTANCE_FLAG_VOLATILE
;
1586 gdb_assert_not_reached ("unrecognized tp_ value in follow_types");
1591 /* Pop the type stack and return the type which corresponds to FOLLOW_TYPE
1592 as modified by all the stuff on the stack. */
1594 follow_types (struct type
*follow_type
)
1598 int make_volatile
= 0;
1599 int make_addr_space
= 0;
1603 switch (pop_type ())
1608 follow_type
= make_cv_type (make_const
,
1609 TYPE_VOLATILE (follow_type
),
1612 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1615 if (make_addr_space
)
1616 follow_type
= make_type_with_address_space (follow_type
,
1618 make_const
= make_volatile
= 0;
1619 make_addr_space
= 0;
1627 case tp_space_identifier
:
1628 make_addr_space
= pop_type_int ();
1631 follow_type
= lookup_pointer_type (follow_type
);
1633 follow_type
= make_cv_type (make_const
,
1634 TYPE_VOLATILE (follow_type
),
1637 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1640 if (make_addr_space
)
1641 follow_type
= make_type_with_address_space (follow_type
,
1643 make_const
= make_volatile
= 0;
1644 make_addr_space
= 0;
1647 follow_type
= lookup_lvalue_reference_type (follow_type
);
1648 goto process_reference
;
1649 case tp_rvalue_reference
:
1650 follow_type
= lookup_rvalue_reference_type (follow_type
);
1653 follow_type
= make_cv_type (make_const
,
1654 TYPE_VOLATILE (follow_type
),
1657 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1660 if (make_addr_space
)
1661 follow_type
= make_type_with_address_space (follow_type
,
1663 make_const
= make_volatile
= 0;
1664 make_addr_space
= 0;
1667 array_size
= pop_type_int ();
1668 /* FIXME-type-allocation: need a way to free this type when we are
1671 lookup_array_range_type (follow_type
,
1672 0, array_size
>= 0 ? array_size
- 1 : 0);
1674 TYPE_HIGH_BOUND_KIND (TYPE_INDEX_TYPE (follow_type
))
1678 /* FIXME-type-allocation: need a way to free this type when we are
1680 follow_type
= lookup_function_type (follow_type
);
1683 case tp_function_with_arguments
:
1685 VEC (type_ptr
) *args
= pop_typelist ();
1688 = lookup_function_type_with_arguments (follow_type
,
1689 VEC_length (type_ptr
, args
),
1690 VEC_address (type_ptr
,
1692 VEC_free (type_ptr
, args
);
1698 struct type_stack
*stack
= pop_type_stack ();
1699 /* Sort of ugly, but not really much worse than the
1701 struct type_stack save
= type_stack
;
1703 type_stack
= *stack
;
1704 follow_type
= follow_types (follow_type
);
1705 gdb_assert (type_stack
.depth
== 0);
1711 gdb_assert_not_reached ("unrecognized tp_ value in follow_types");
1716 /* This function avoids direct calls to fprintf
1717 in the parser generated debug code. */
1719 parser_fprintf (FILE *x
, const char *y
, ...)
1725 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1728 fprintf_unfiltered (gdb_stderr
, " Unknown FILE used.\n");
1729 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1734 /* Implementation of the exp_descriptor method operator_check. */
1737 operator_check_standard (struct expression
*exp
, int pos
,
1738 int (*objfile_func
) (struct objfile
*objfile
,
1742 const union exp_element
*const elts
= exp
->elts
;
1743 struct type
*type
= NULL
;
1744 struct objfile
*objfile
= NULL
;
1746 /* Extended operators should have been already handled by exp_descriptor
1747 iterate method of its specific language. */
1748 gdb_assert (elts
[pos
].opcode
< OP_EXTENDED0
);
1750 /* Track the callers of write_exp_elt_type for this table. */
1752 switch (elts
[pos
].opcode
)
1764 type
= elts
[pos
+ 1].type
;
1769 LONGEST arg
, nargs
= elts
[pos
+ 2].longconst
;
1771 for (arg
= 0; arg
< nargs
; arg
++)
1773 struct type
*type
= elts
[pos
+ 3 + arg
].type
;
1774 struct objfile
*objfile
= TYPE_OBJFILE (type
);
1776 if (objfile
&& (*objfile_func
) (objfile
, data
))
1784 const struct block
*const block
= elts
[pos
+ 1].block
;
1785 const struct symbol
*const symbol
= elts
[pos
+ 2].symbol
;
1787 /* Check objfile where the variable itself is placed.
1788 SYMBOL_OBJ_SECTION (symbol) may be NULL. */
1789 if ((*objfile_func
) (symbol_objfile (symbol
), data
))
1792 /* Check objfile where is placed the code touching the variable. */
1793 objfile
= lookup_objfile_from_block (block
);
1795 type
= SYMBOL_TYPE (symbol
);
1798 case OP_VAR_MSYM_VALUE
:
1799 objfile
= elts
[pos
+ 1].objfile
;
1803 /* Invoke callbacks for TYPE and OBJFILE if they were set as non-NULL. */
1805 if (type
&& TYPE_OBJFILE (type
)
1806 && (*objfile_func
) (TYPE_OBJFILE (type
), data
))
1808 if (objfile
&& (*objfile_func
) (objfile
, data
))
1814 /* Call OBJFILE_FUNC for any objfile found being referenced by EXP.
1815 OBJFILE_FUNC is never called with NULL OBJFILE. OBJFILE_FUNC get
1816 passed an arbitrary caller supplied DATA pointer. If OBJFILE_FUNC
1817 returns non-zero value then (any other) non-zero value is immediately
1818 returned to the caller. Otherwise zero is returned after iterating
1819 through whole EXP. */
1822 exp_iterate (struct expression
*exp
,
1823 int (*objfile_func
) (struct objfile
*objfile
, void *data
),
1828 for (endpos
= exp
->nelts
; endpos
> 0; )
1830 int pos
, args
, oplen
= 0;
1832 operator_length (exp
, endpos
, &oplen
, &args
);
1833 gdb_assert (oplen
> 0);
1835 pos
= endpos
- oplen
;
1836 if (exp
->language_defn
->la_exp_desc
->operator_check (exp
, pos
,
1837 objfile_func
, data
))
1846 /* Helper for exp_uses_objfile. */
1849 exp_uses_objfile_iter (struct objfile
*exp_objfile
, void *objfile_voidp
)
1851 struct objfile
*objfile
= (struct objfile
*) objfile_voidp
;
1853 if (exp_objfile
->separate_debug_objfile_backlink
)
1854 exp_objfile
= exp_objfile
->separate_debug_objfile_backlink
;
1856 return exp_objfile
== objfile
;
1859 /* Return 1 if EXP uses OBJFILE (and will become dangling when OBJFILE
1860 is unloaded), otherwise return 0. OBJFILE must not be a separate debug info
1864 exp_uses_objfile (struct expression
*exp
, struct objfile
*objfile
)
1866 gdb_assert (objfile
->separate_debug_objfile_backlink
== NULL
);
1868 return exp_iterate (exp
, exp_uses_objfile_iter
, objfile
);
1871 /* See definition in parser-defs.h. */
1874 increase_expout_size (struct parser_state
*ps
, size_t lenelt
)
1876 if ((ps
->expout_ptr
+ lenelt
) >= ps
->expout_size
)
1878 ps
->expout_size
= std::max (ps
->expout_size
* 2,
1879 ps
->expout_ptr
+ lenelt
+ 10);
1880 ps
->expout
.reset (XRESIZEVAR (expression
,
1881 ps
->expout
.release (),
1882 (sizeof (struct expression
)
1883 + EXP_ELEM_TO_BYTES (ps
->expout_size
))));
1888 _initialize_parse (void)
1890 type_stack
.size
= 0;
1891 type_stack
.depth
= 0;
1892 type_stack
.elements
= NULL
;
1894 add_setshow_zuinteger_cmd ("expression", class_maintenance
,
1896 _("Set expression debugging."),
1897 _("Show expression debugging."),
1898 _("When non-zero, the internal representation "
1899 "of expressions will be printed."),
1901 show_expressiondebug
,
1902 &setdebuglist
, &showdebuglist
);
1903 add_setshow_boolean_cmd ("parser", class_maintenance
,
1905 _("Set parser debugging."),
1906 _("Show parser debugging."),
1907 _("When non-zero, expression parser "
1908 "tracing will be enabled."),
1911 &setdebuglist
, &showdebuglist
);