1 /* Parse expressions for GDB.
3 Copyright (C) 1986-2015 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 */
51 #include "user-regs.h"
53 /* Standard set of definitions for printing, dumping, prefixifying,
54 * and evaluating expressions. */
56 const struct exp_descriptor exp_descriptor_standard
=
58 print_subexp_standard
,
59 operator_length_standard
,
60 operator_check_standard
,
62 dump_subexp_body_standard
,
63 evaluate_subexp_standard
66 /* Global variables declared in parser-defs.h (and commented there). */
67 const struct block
*expression_context_block
;
68 CORE_ADDR expression_context_pc
;
69 const struct block
*innermost_block
;
71 static struct type_stack type_stack
;
73 const char *prev_lexptr
;
77 /* True if parsing an expression to attempt completion. */
80 /* The index of the last struct expression directly before a '.' or
81 '->'. This is set when parsing and is only used when completing a
82 field name. It is -1 if no dereference operation was found. */
83 static int expout_last_struct
= -1;
85 /* If we are completing a tagged type name, this will be nonzero. */
86 static enum type_code expout_tag_completion_type
= TYPE_CODE_UNDEF
;
88 /* The token for tagged type name completion. */
89 static char *expout_completion_name
;
92 static unsigned int expressiondebug
= 0;
94 show_expressiondebug (struct ui_file
*file
, int from_tty
,
95 struct cmd_list_element
*c
, const char *value
)
97 fprintf_filtered (file
, _("Expression debugging is %s.\n"), value
);
101 /* Non-zero if an expression parser should set yydebug. */
105 show_parserdebug (struct ui_file
*file
, int from_tty
,
106 struct cmd_list_element
*c
, const char *value
)
108 fprintf_filtered (file
, _("Parser debugging is %s.\n"), value
);
112 static void free_funcalls (void *ignore
);
114 static int prefixify_subexp (struct expression
*, struct expression
*, int,
117 static struct expression
*parse_exp_in_context (const char **, CORE_ADDR
,
118 const struct block
*, int,
120 static struct expression
*parse_exp_in_context_1 (const char **, CORE_ADDR
,
121 const struct block
*, int,
124 void _initialize_parse (void);
126 /* Data structure for saving values of arglist_len for function calls whose
127 arguments contain other function calls. */
131 struct funcall
*next
;
135 static struct funcall
*funcall_chain
;
137 /* Begin counting arguments for a function call,
138 saving the data about any containing call. */
143 struct funcall
*newobj
;
145 newobj
= (struct funcall
*) xmalloc (sizeof (struct funcall
));
146 newobj
->next
= funcall_chain
;
147 newobj
->arglist_len
= arglist_len
;
149 funcall_chain
= newobj
;
152 /* Return the number of arguments in a function call just terminated,
153 and restore the data for the containing function call. */
158 int val
= arglist_len
;
159 struct funcall
*call
= funcall_chain
;
161 funcall_chain
= call
->next
;
162 arglist_len
= call
->arglist_len
;
167 /* Free everything in the funcall chain.
168 Used when there is an error inside parsing. */
171 free_funcalls (void *ignore
)
173 struct funcall
*call
, *next
;
175 for (call
= funcall_chain
; call
; call
= next
)
183 /* See definition in parser-defs.h. */
186 initialize_expout (struct parser_state
*ps
, size_t initial_size
,
187 const struct language_defn
*lang
,
188 struct gdbarch
*gdbarch
)
190 ps
->expout_size
= initial_size
;
192 ps
->expout
= xmalloc (sizeof (struct expression
)
193 + EXP_ELEM_TO_BYTES (ps
->expout_size
));
194 ps
->expout
->language_defn
= lang
;
195 ps
->expout
->gdbarch
= gdbarch
;
198 /* See definition in parser-defs.h. */
201 reallocate_expout (struct parser_state
*ps
)
203 /* Record the actual number of expression elements, and then
204 reallocate the expression memory so that we free up any
207 ps
->expout
->nelts
= ps
->expout_ptr
;
208 ps
->expout
= (struct expression
*)
209 xrealloc (ps
->expout
,
210 sizeof (struct expression
)
211 + EXP_ELEM_TO_BYTES (ps
->expout_ptr
));
214 /* This page contains the functions for adding data to the struct expression
215 being constructed. */
217 /* Add one element to the end of the expression. */
219 /* To avoid a bug in the Sun 4 compiler, we pass things that can fit into
220 a register through here. */
223 write_exp_elt (struct parser_state
*ps
, const union exp_element
*expelt
)
225 if (ps
->expout_ptr
>= ps
->expout_size
)
227 ps
->expout_size
*= 2;
228 ps
->expout
= (struct expression
*)
229 xrealloc (ps
->expout
, sizeof (struct expression
)
230 + EXP_ELEM_TO_BYTES (ps
->expout_size
));
232 ps
->expout
->elts
[ps
->expout_ptr
++] = *expelt
;
236 write_exp_elt_opcode (struct parser_state
*ps
, enum exp_opcode expelt
)
238 union exp_element tmp
;
240 memset (&tmp
, 0, sizeof (union exp_element
));
242 write_exp_elt (ps
, &tmp
);
246 write_exp_elt_sym (struct parser_state
*ps
, struct symbol
*expelt
)
248 union exp_element tmp
;
250 memset (&tmp
, 0, sizeof (union exp_element
));
252 write_exp_elt (ps
, &tmp
);
256 write_exp_elt_block (struct parser_state
*ps
, const struct block
*b
)
258 union exp_element tmp
;
260 memset (&tmp
, 0, sizeof (union exp_element
));
262 write_exp_elt (ps
, &tmp
);
266 write_exp_elt_objfile (struct parser_state
*ps
, struct objfile
*objfile
)
268 union exp_element tmp
;
270 memset (&tmp
, 0, sizeof (union exp_element
));
271 tmp
.objfile
= objfile
;
272 write_exp_elt (ps
, &tmp
);
276 write_exp_elt_longcst (struct parser_state
*ps
, LONGEST expelt
)
278 union exp_element tmp
;
280 memset (&tmp
, 0, sizeof (union exp_element
));
281 tmp
.longconst
= expelt
;
282 write_exp_elt (ps
, &tmp
);
286 write_exp_elt_dblcst (struct parser_state
*ps
, DOUBLEST expelt
)
288 union exp_element tmp
;
290 memset (&tmp
, 0, sizeof (union exp_element
));
291 tmp
.doubleconst
= expelt
;
292 write_exp_elt (ps
, &tmp
);
296 write_exp_elt_decfloatcst (struct parser_state
*ps
, gdb_byte expelt
[16])
298 union exp_element tmp
;
301 for (index
= 0; index
< 16; index
++)
302 tmp
.decfloatconst
[index
] = expelt
[index
];
304 write_exp_elt (ps
, &tmp
);
308 write_exp_elt_type (struct parser_state
*ps
, struct type
*expelt
)
310 union exp_element tmp
;
312 memset (&tmp
, 0, sizeof (union exp_element
));
314 write_exp_elt (ps
, &tmp
);
318 write_exp_elt_intern (struct parser_state
*ps
, struct internalvar
*expelt
)
320 union exp_element tmp
;
322 memset (&tmp
, 0, sizeof (union exp_element
));
323 tmp
.internalvar
= expelt
;
324 write_exp_elt (ps
, &tmp
);
327 /* Add a string constant to the end of the expression.
329 String constants are stored by first writing an expression element
330 that contains the length of the string, then stuffing the string
331 constant itself into however many expression elements are needed
332 to hold it, and then writing another expression element that contains
333 the length of the string. I.e. an expression element at each end of
334 the string records the string length, so you can skip over the
335 expression elements containing the actual string bytes from either
336 end of the string. Note that this also allows gdb to handle
337 strings with embedded null bytes, as is required for some languages.
339 Don't be fooled by the fact that the string is null byte terminated,
340 this is strictly for the convenience of debugging gdb itself.
341 Gdb does not depend up the string being null terminated, since the
342 actual length is recorded in expression elements at each end of the
343 string. The null byte is taken into consideration when computing how
344 many expression elements are required to hold the string constant, of
349 write_exp_string (struct parser_state
*ps
, struct stoken str
)
351 int len
= str
.length
;
355 /* Compute the number of expression elements required to hold the string
356 (including a null byte terminator), along with one expression element
357 at each end to record the actual string length (not including the
358 null byte terminator). */
360 lenelt
= 2 + BYTES_TO_EXP_ELEM (len
+ 1);
362 increase_expout_size (ps
, lenelt
);
364 /* Write the leading length expression element (which advances the current
365 expression element index), then write the string constant followed by a
366 terminating null byte, and then write the trailing length expression
369 write_exp_elt_longcst (ps
, (LONGEST
) len
);
370 strdata
= (char *) &ps
->expout
->elts
[ps
->expout_ptr
];
371 memcpy (strdata
, str
.ptr
, len
);
372 *(strdata
+ len
) = '\0';
373 ps
->expout_ptr
+= lenelt
- 2;
374 write_exp_elt_longcst (ps
, (LONGEST
) len
);
377 /* Add a vector of string constants to the end of the expression.
379 This adds an OP_STRING operation, but encodes the contents
380 differently from write_exp_string. The language is expected to
381 handle evaluation of this expression itself.
383 After the usual OP_STRING header, TYPE is written into the
384 expression as a long constant. The interpretation of this field is
385 up to the language evaluator.
387 Next, each string in VEC is written. The length is written as a
388 long constant, followed by the contents of the string. */
391 write_exp_string_vector (struct parser_state
*ps
, int type
,
392 struct stoken_vector
*vec
)
397 /* Compute the size. We compute the size in number of slots to
398 avoid issues with string padding. */
400 for (i
= 0; i
< vec
->len
; ++i
)
402 /* One slot for the length of this element, plus the number of
403 slots needed for this string. */
404 n_slots
+= 1 + BYTES_TO_EXP_ELEM (vec
->tokens
[i
].length
);
407 /* One more slot for the type of the string. */
410 /* Now compute a phony string length. */
411 len
= EXP_ELEM_TO_BYTES (n_slots
) - 1;
414 increase_expout_size (ps
, n_slots
);
416 write_exp_elt_opcode (ps
, OP_STRING
);
417 write_exp_elt_longcst (ps
, len
);
418 write_exp_elt_longcst (ps
, type
);
420 for (i
= 0; i
< vec
->len
; ++i
)
422 write_exp_elt_longcst (ps
, vec
->tokens
[i
].length
);
423 memcpy (&ps
->expout
->elts
[ps
->expout_ptr
], vec
->tokens
[i
].ptr
,
424 vec
->tokens
[i
].length
);
425 ps
->expout_ptr
+= BYTES_TO_EXP_ELEM (vec
->tokens
[i
].length
);
428 write_exp_elt_longcst (ps
, len
);
429 write_exp_elt_opcode (ps
, OP_STRING
);
432 /* Add a bitstring constant to the end of the expression.
434 Bitstring constants are stored by first writing an expression element
435 that contains the length of the bitstring (in bits), then stuffing the
436 bitstring constant itself into however many expression elements are
437 needed to hold it, and then writing another expression element that
438 contains the length of the bitstring. I.e. an expression element at
439 each end of the bitstring records the bitstring length, so you can skip
440 over the expression elements containing the actual bitstring bytes from
441 either end of the bitstring. */
444 write_exp_bitstring (struct parser_state
*ps
, struct stoken str
)
446 int bits
= str
.length
; /* length in bits */
447 int len
= (bits
+ HOST_CHAR_BIT
- 1) / HOST_CHAR_BIT
;
451 /* Compute the number of expression elements required to hold the bitstring,
452 along with one expression element at each end to record the actual
453 bitstring length in bits. */
455 lenelt
= 2 + BYTES_TO_EXP_ELEM (len
);
457 increase_expout_size (ps
, lenelt
);
459 /* Write the leading length expression element (which advances the current
460 expression element index), then write the bitstring constant, and then
461 write the trailing length expression element. */
463 write_exp_elt_longcst (ps
, (LONGEST
) bits
);
464 strdata
= (char *) &ps
->expout
->elts
[ps
->expout_ptr
];
465 memcpy (strdata
, str
.ptr
, len
);
466 ps
->expout_ptr
+= lenelt
- 2;
467 write_exp_elt_longcst (ps
, (LONGEST
) bits
);
470 /* Add the appropriate elements for a minimal symbol to the end of
474 write_exp_msymbol (struct parser_state
*ps
,
475 struct bound_minimal_symbol bound_msym
)
477 struct minimal_symbol
*msymbol
= bound_msym
.minsym
;
478 struct objfile
*objfile
= bound_msym
.objfile
;
479 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
481 CORE_ADDR addr
= BMSYMBOL_VALUE_ADDRESS (bound_msym
);
482 struct obj_section
*section
= MSYMBOL_OBJ_SECTION (objfile
, msymbol
);
483 enum minimal_symbol_type type
= MSYMBOL_TYPE (msymbol
);
486 /* The minimal symbol might point to a function descriptor;
487 resolve it to the actual code address instead. */
488 pc
= gdbarch_convert_from_func_ptr_addr (gdbarch
, addr
, ¤t_target
);
491 struct bound_minimal_symbol ifunc_msym
= lookup_minimal_symbol_by_pc (pc
);
493 /* In this case, assume we have a code symbol instead of
496 if (ifunc_msym
.minsym
!= NULL
497 && MSYMBOL_TYPE (ifunc_msym
.minsym
) == mst_text_gnu_ifunc
498 && BMSYMBOL_VALUE_ADDRESS (ifunc_msym
) == pc
)
500 /* A function descriptor has been resolved but PC is still in the
501 STT_GNU_IFUNC resolver body (such as because inferior does not
502 run to be able to call it). */
504 type
= mst_text_gnu_ifunc
;
512 if (overlay_debugging
)
513 addr
= symbol_overlayed_address (addr
, section
);
515 write_exp_elt_opcode (ps
, OP_LONG
);
516 /* Let's make the type big enough to hold a 64-bit address. */
517 write_exp_elt_type (ps
, objfile_type (objfile
)->builtin_core_addr
);
518 write_exp_elt_longcst (ps
, (LONGEST
) addr
);
519 write_exp_elt_opcode (ps
, OP_LONG
);
521 if (section
&& section
->the_bfd_section
->flags
& SEC_THREAD_LOCAL
)
523 write_exp_elt_opcode (ps
, UNOP_MEMVAL_TLS
);
524 write_exp_elt_objfile (ps
, objfile
);
525 write_exp_elt_type (ps
, objfile_type (objfile
)->nodebug_tls_symbol
);
526 write_exp_elt_opcode (ps
, UNOP_MEMVAL_TLS
);
530 write_exp_elt_opcode (ps
, UNOP_MEMVAL
);
535 case mst_solib_trampoline
:
536 write_exp_elt_type (ps
, objfile_type (objfile
)->nodebug_text_symbol
);
539 case mst_text_gnu_ifunc
:
540 write_exp_elt_type (ps
, objfile_type (objfile
)
541 ->nodebug_text_gnu_ifunc_symbol
);
548 write_exp_elt_type (ps
, objfile_type (objfile
)->nodebug_data_symbol
);
551 case mst_slot_got_plt
:
552 write_exp_elt_type (ps
, objfile_type (objfile
)->nodebug_got_plt_symbol
);
556 write_exp_elt_type (ps
, objfile_type (objfile
)->nodebug_unknown_symbol
);
559 write_exp_elt_opcode (ps
, UNOP_MEMVAL
);
562 /* Mark the current index as the starting location of a structure
563 expression. This is used when completing on field names. */
566 mark_struct_expression (struct parser_state
*ps
)
568 gdb_assert (parse_completion
569 && expout_tag_completion_type
== TYPE_CODE_UNDEF
);
570 expout_last_struct
= ps
->expout_ptr
;
573 /* Indicate that the current parser invocation is completing a tag.
574 TAG is the type code of the tag, and PTR and LENGTH represent the
575 start of the tag name. */
578 mark_completion_tag (enum type_code tag
, const char *ptr
, int length
)
580 gdb_assert (parse_completion
581 && expout_tag_completion_type
== TYPE_CODE_UNDEF
582 && expout_completion_name
== NULL
583 && expout_last_struct
== -1);
584 gdb_assert (tag
== TYPE_CODE_UNION
585 || tag
== TYPE_CODE_STRUCT
586 || tag
== TYPE_CODE_ENUM
);
587 expout_tag_completion_type
= tag
;
588 expout_completion_name
= xmalloc (length
+ 1);
589 memcpy (expout_completion_name
, ptr
, length
);
590 expout_completion_name
[length
] = '\0';
594 /* Recognize tokens that start with '$'. These include:
596 $regname A native register name or a "standard
599 $variable A convenience variable with a name chosen
602 $digits Value history with index <digits>, starting
603 from the first value which has index 1.
605 $$digits Value history with index <digits> relative
606 to the last value. I.e. $$0 is the last
607 value, $$1 is the one previous to that, $$2
608 is the one previous to $$1, etc.
610 $ | $0 | $$0 The last value in the value history.
612 $$ An abbreviation for the second to the last
613 value in the value history, I.e. $$1 */
616 write_dollar_variable (struct parser_state
*ps
, struct stoken str
)
618 struct symbol
*sym
= NULL
;
619 struct bound_minimal_symbol msym
;
620 struct internalvar
*isym
= NULL
;
622 /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1)
623 and $$digits (equivalent to $<-digits> if you could type that). */
627 /* Double dollar means negate the number and add -1 as well.
628 Thus $$ alone means -1. */
629 if (str
.length
>= 2 && str
.ptr
[1] == '$')
636 /* Just dollars (one or two). */
640 /* Is the rest of the token digits? */
641 for (; i
< str
.length
; i
++)
642 if (!(str
.ptr
[i
] >= '0' && str
.ptr
[i
] <= '9'))
646 i
= atoi (str
.ptr
+ 1 + negate
);
652 /* Handle tokens that refer to machine registers:
653 $ followed by a register name. */
654 i
= user_reg_map_name_to_regnum (parse_gdbarch (ps
),
655 str
.ptr
+ 1, str
.length
- 1);
657 goto handle_register
;
659 /* Any names starting with $ are probably debugger internal variables. */
661 isym
= lookup_only_internalvar (copy_name (str
) + 1);
664 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
665 write_exp_elt_intern (ps
, isym
);
666 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
670 /* On some systems, such as HP-UX and hppa-linux, certain system routines
671 have names beginning with $ or $$. Check for those, first. */
673 sym
= lookup_symbol (copy_name (str
), (struct block
*) NULL
,
677 write_exp_elt_opcode (ps
, OP_VAR_VALUE
);
678 write_exp_elt_block (ps
, block_found
); /* set by lookup_symbol */
679 write_exp_elt_sym (ps
, sym
);
680 write_exp_elt_opcode (ps
, OP_VAR_VALUE
);
683 msym
= lookup_bound_minimal_symbol (copy_name (str
));
686 write_exp_msymbol (ps
, msym
);
690 /* Any other names are assumed to be debugger internal variables. */
692 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
693 write_exp_elt_intern (ps
, create_internalvar (copy_name (str
) + 1));
694 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
697 write_exp_elt_opcode (ps
, OP_LAST
);
698 write_exp_elt_longcst (ps
, (LONGEST
) i
);
699 write_exp_elt_opcode (ps
, OP_LAST
);
702 write_exp_elt_opcode (ps
, OP_REGISTER
);
705 write_exp_string (ps
, str
);
706 write_exp_elt_opcode (ps
, OP_REGISTER
);
712 find_template_name_end (const char *p
)
715 int just_seen_right
= 0;
716 int just_seen_colon
= 0;
717 int just_seen_space
= 0;
719 if (!p
|| (*p
!= '<'))
730 /* In future, may want to allow these?? */
733 depth
++; /* start nested template */
734 if (just_seen_colon
|| just_seen_right
|| just_seen_space
)
735 return 0; /* but not after : or :: or > or space */
738 if (just_seen_colon
|| just_seen_right
)
739 return 0; /* end a (nested?) template */
740 just_seen_right
= 1; /* but not after : or :: */
741 if (--depth
== 0) /* also disallow >>, insist on > > */
742 return ++p
; /* if outermost ended, return */
745 if (just_seen_space
|| (just_seen_colon
> 1))
746 return 0; /* nested class spec coming up */
747 just_seen_colon
++; /* we allow :: but not :::: */
752 if (!((*p
>= 'a' && *p
<= 'z') || /* allow token chars */
753 (*p
>= 'A' && *p
<= 'Z') ||
754 (*p
>= '0' && *p
<= '9') ||
755 (*p
== '_') || (*p
== ',') || /* commas for template args */
756 (*p
== '&') || (*p
== '*') || /* pointer and ref types */
757 (*p
== '(') || (*p
== ')') || /* function types */
758 (*p
== '[') || (*p
== ']'))) /* array types */
772 /* Return a null-terminated temporary copy of the name of a string token.
774 Tokens that refer to names do so with explicit pointer and length,
775 so they can share the storage that lexptr is parsing.
776 When it is necessary to pass a name to a function that expects
777 a null-terminated string, the substring is copied out
778 into a separate block of storage.
780 N.B. A single buffer is reused on each call. */
783 copy_name (struct stoken token
)
785 /* A temporary buffer for identifiers, so we can null-terminate them.
786 We allocate this with xrealloc. parse_exp_1 used to allocate with
787 alloca, using the size of the whole expression as a conservative
788 estimate of the space needed. However, macro expansion can
789 introduce names longer than the original expression; there's no
790 practical way to know beforehand how large that might be. */
791 static char *namecopy
;
792 static size_t namecopy_size
;
794 /* Make sure there's enough space for the token. */
795 if (namecopy_size
< token
.length
+ 1)
797 namecopy_size
= token
.length
+ 1;
798 namecopy
= xrealloc (namecopy
, token
.length
+ 1);
801 memcpy (namecopy
, token
.ptr
, token
.length
);
802 namecopy
[token
.length
] = 0;
808 /* See comments on parser-defs.h. */
811 prefixify_expression (struct expression
*expr
)
813 int len
= sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expr
->nelts
);
814 struct expression
*temp
;
815 int inpos
= expr
->nelts
, outpos
= 0;
817 temp
= (struct expression
*) alloca (len
);
819 /* Copy the original expression into temp. */
820 memcpy (temp
, expr
, len
);
822 return prefixify_subexp (temp
, expr
, inpos
, outpos
);
825 /* Return the number of exp_elements in the postfix subexpression
826 of EXPR whose operator is at index ENDPOS - 1 in EXPR. */
829 length_of_subexp (struct expression
*expr
, int endpos
)
833 operator_length (expr
, endpos
, &oplen
, &args
);
837 oplen
+= length_of_subexp (expr
, endpos
- oplen
);
844 /* Sets *OPLENP to the length of the operator whose (last) index is
845 ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that
849 operator_length (const struct expression
*expr
, int endpos
, int *oplenp
,
852 expr
->language_defn
->la_exp_desc
->operator_length (expr
, endpos
,
856 /* Default value for operator_length in exp_descriptor vectors. */
859 operator_length_standard (const struct expression
*expr
, int endpos
,
860 int *oplenp
, int *argsp
)
864 enum f90_range_type range_type
;
868 error (_("?error in operator_length_standard"));
870 i
= (int) expr
->elts
[endpos
- 1].opcode
;
876 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
877 oplen
= 5 + BYTES_TO_EXP_ELEM (oplen
+ 1);
891 case OP_VAR_ENTRY_VALUE
:
901 case OP_F77_UNDETERMINED_ARGLIST
:
903 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
907 oplen
= 4 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
911 case OP_OBJC_MSGCALL
: /* Objective C message (method) call. */
913 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
922 case UNOP_DYNAMIC_CAST
:
923 case UNOP_REINTERPRET_CAST
:
924 case UNOP_MEMVAL_TYPE
:
936 case UNOP_MEMVAL_TLS
:
957 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
958 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
963 case STRUCTOP_STRUCT
:
970 case OP_OBJC_NSSTRING
: /* Objective C Foundation Class
971 NSString constant. */
972 case OP_OBJC_SELECTOR
: /* Objective C "@selector" pseudo-op. */
974 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
975 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
980 args
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
981 args
-= longest_to_int (expr
->elts
[endpos
- 3].longconst
);
991 case MULTI_SUBSCRIPT
:
993 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
996 case BINOP_ASSIGN_MODIFY
:
1009 range_type
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
1012 case LOW_BOUND_DEFAULT
:
1013 case HIGH_BOUND_DEFAULT
:
1016 case BOTH_BOUND_DEFAULT
:
1019 case NONE_BOUND_DEFAULT
:
1027 args
= 1 + (i
< (int) BINOP_END
);
1034 /* Copy the subexpression ending just before index INEND in INEXPR
1035 into OUTEXPR, starting at index OUTBEG.
1036 In the process, convert it from suffix to prefix form.
1037 If EXPOUT_LAST_STRUCT is -1, then this function always returns -1.
1038 Otherwise, it returns the index of the subexpression which is the
1039 left-hand-side of the expression at EXPOUT_LAST_STRUCT. */
1042 prefixify_subexp (struct expression
*inexpr
,
1043 struct expression
*outexpr
, int inend
, int outbeg
)
1051 operator_length (inexpr
, inend
, &oplen
, &args
);
1053 /* Copy the final operator itself, from the end of the input
1054 to the beginning of the output. */
1056 memcpy (&outexpr
->elts
[outbeg
], &inexpr
->elts
[inend
],
1057 EXP_ELEM_TO_BYTES (oplen
));
1060 if (expout_last_struct
== inend
)
1061 result
= outbeg
- oplen
;
1063 /* Find the lengths of the arg subexpressions. */
1064 arglens
= (int *) alloca (args
* sizeof (int));
1065 for (i
= args
- 1; i
>= 0; i
--)
1067 oplen
= length_of_subexp (inexpr
, inend
);
1072 /* Now copy each subexpression, preserving the order of
1073 the subexpressions, but prefixifying each one.
1074 In this loop, inend starts at the beginning of
1075 the expression this level is working on
1076 and marches forward over the arguments.
1077 outbeg does similarly in the output. */
1078 for (i
= 0; i
< args
; i
++)
1084 r
= prefixify_subexp (inexpr
, outexpr
, inend
, outbeg
);
1087 /* Return immediately. We probably have only parsed a
1088 partial expression, so we don't want to try to reverse
1089 the other operands. */
1098 /* Read an expression from the string *STRINGPTR points to,
1099 parse it, and return a pointer to a struct expression that we malloc.
1100 Use block BLOCK as the lexical context for variable names;
1101 if BLOCK is zero, use the block of the selected stack frame.
1102 Meanwhile, advance *STRINGPTR to point after the expression,
1103 at the first nonwhite character that is not part of the expression
1104 (possibly a null character).
1106 If COMMA is nonzero, stop if a comma is reached. */
1109 parse_exp_1 (const char **stringptr
, CORE_ADDR pc
, const struct block
*block
,
1112 return parse_exp_in_context (stringptr
, pc
, block
, comma
, 0, NULL
);
1115 static struct expression
*
1116 parse_exp_in_context (const char **stringptr
, CORE_ADDR pc
,
1117 const struct block
*block
,
1118 int comma
, int void_context_p
, int *out_subexp
)
1120 return parse_exp_in_context_1 (stringptr
, pc
, block
, comma
,
1121 void_context_p
, out_subexp
);
1124 /* As for parse_exp_1, except that if VOID_CONTEXT_P, then
1125 no value is expected from the expression.
1126 OUT_SUBEXP is set when attempting to complete a field name; in this
1127 case it is set to the index of the subexpression on the
1128 left-hand-side of the struct op. If not doing such completion, it
1129 is left untouched. */
1131 static struct expression
*
1132 parse_exp_in_context_1 (const char **stringptr
, CORE_ADDR pc
,
1133 const struct block
*block
,
1134 int comma
, int void_context_p
, int *out_subexp
)
1136 struct cleanup
*old_chain
, *inner_chain
;
1137 const struct language_defn
*lang
= NULL
;
1138 struct parser_state ps
;
1141 lexptr
= *stringptr
;
1145 type_stack
.depth
= 0;
1146 expout_last_struct
= -1;
1147 expout_tag_completion_type
= TYPE_CODE_UNDEF
;
1148 xfree (expout_completion_name
);
1149 expout_completion_name
= NULL
;
1151 comma_terminates
= comma
;
1153 if (lexptr
== 0 || *lexptr
== 0)
1154 error_no_arg (_("expression to compute"));
1156 old_chain
= make_cleanup (free_funcalls
, 0 /*ignore*/);
1159 expression_context_block
= block
;
1161 /* If no context specified, try using the current frame, if any. */
1162 if (!expression_context_block
)
1163 expression_context_block
= get_selected_block (&expression_context_pc
);
1165 expression_context_pc
= BLOCK_START (expression_context_block
);
1167 expression_context_pc
= pc
;
1169 /* Fall back to using the current source static context, if any. */
1171 if (!expression_context_block
)
1173 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
1175 expression_context_block
1176 = BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (cursal
.symtab
),
1178 if (expression_context_block
)
1179 expression_context_pc
= BLOCK_START (expression_context_block
);
1182 if (language_mode
== language_mode_auto
&& block
!= NULL
)
1184 /* Find the language associated to the given context block.
1185 Default to the current language if it can not be determined.
1187 Note that using the language corresponding to the current frame
1188 can sometimes give unexpected results. For instance, this
1189 routine is often called several times during the inferior
1190 startup phase to re-parse breakpoint expressions after
1191 a new shared library has been loaded. The language associated
1192 to the current frame at this moment is not relevant for
1193 the breakpoint. Using it would therefore be silly, so it seems
1194 better to rely on the current language rather than relying on
1195 the current frame language to parse the expression. That's why
1196 we do the following language detection only if the context block
1197 has been specifically provided. */
1198 struct symbol
*func
= block_linkage_function (block
);
1201 lang
= language_def (SYMBOL_LANGUAGE (func
));
1202 if (lang
== NULL
|| lang
->la_language
== language_unknown
)
1203 lang
= current_language
;
1206 lang
= current_language
;
1208 /* get_current_arch may reset CURRENT_LANGUAGE via select_frame.
1209 While we need CURRENT_LANGUAGE to be set to LANG (for lookup_symbol
1210 and others called from *.y) ensure CURRENT_LANGUAGE gets restored
1211 to the value matching SELECTED_FRAME as set by get_current_arch. */
1213 initialize_expout (&ps
, 10, lang
, get_current_arch ());
1214 inner_chain
= make_cleanup_restore_current_language ();
1215 set_language (lang
->la_language
);
1219 if (lang
->la_parser (&ps
))
1220 lang
->la_error (NULL
);
1222 CATCH (except
, RETURN_MASK_ALL
)
1224 if (! parse_completion
)
1227 throw_exception (except
);
1232 reallocate_expout (&ps
);
1234 /* Convert expression from postfix form as generated by yacc
1235 parser, to a prefix form. */
1237 if (expressiondebug
)
1238 dump_raw_expression (ps
.expout
, gdb_stdlog
,
1239 "before conversion to prefix form");
1241 subexp
= prefixify_expression (ps
.expout
);
1243 *out_subexp
= subexp
;
1245 lang
->la_post_parser (&ps
.expout
, void_context_p
);
1247 if (expressiondebug
)
1248 dump_prefix_expression (ps
.expout
, gdb_stdlog
);
1250 do_cleanups (inner_chain
);
1251 discard_cleanups (old_chain
);
1253 *stringptr
= lexptr
;
1257 /* Parse STRING as an expression, and complain if this fails
1258 to use up all of the contents of STRING. */
1261 parse_expression (const char *string
)
1263 struct expression
*exp
;
1265 exp
= parse_exp_1 (&string
, 0, 0, 0);
1267 error (_("Junk after end of expression."));
1271 /* Parse STRING as an expression. If parsing ends in the middle of a
1272 field reference, return the type of the left-hand-side of the
1273 reference; furthermore, if the parsing ends in the field name,
1274 return the field name in *NAME. If the parsing ends in the middle
1275 of a field reference, but the reference is somehow invalid, throw
1276 an exception. In all other cases, return NULL. Returned non-NULL
1277 *NAME must be freed by the caller. */
1280 parse_expression_for_completion (const char *string
, char **name
,
1281 enum type_code
*code
)
1283 struct expression
*exp
= NULL
;
1289 parse_completion
= 1;
1290 exp
= parse_exp_in_context (&string
, 0, 0, 0, 0, &subexp
);
1292 CATCH (except
, RETURN_MASK_ERROR
)
1294 /* Nothing, EXP remains NULL. */
1298 parse_completion
= 0;
1302 if (expout_tag_completion_type
!= TYPE_CODE_UNDEF
)
1304 *code
= expout_tag_completion_type
;
1305 *name
= expout_completion_name
;
1306 expout_completion_name
= NULL
;
1310 if (expout_last_struct
== -1)
1316 *name
= extract_field_op (exp
, &subexp
);
1323 /* This might throw an exception. If so, we want to let it
1325 val
= evaluate_subexpression_type (exp
, subexp
);
1326 /* (*NAME) is a part of the EXP memory block freed below. */
1327 *name
= xstrdup (*name
);
1330 return value_type (val
);
1333 /* A post-parser that does nothing. */
1336 null_post_parser (struct expression
**exp
, int void_context_p
)
1340 /* Parse floating point value P of length LEN.
1341 Return 0 (false) if invalid, 1 (true) if valid.
1342 The successfully parsed number is stored in D.
1343 *SUFFIX points to the suffix of the number in P.
1345 NOTE: This accepts the floating point syntax that sscanf accepts. */
1348 parse_float (const char *p
, int len
, DOUBLEST
*d
, const char **suffix
)
1353 copy
= xmalloc (len
+ 1);
1354 memcpy (copy
, p
, len
);
1357 num
= sscanf (copy
, "%" DOUBLEST_SCAN_FORMAT
"%n", d
, &n
);
1360 /* The sscanf man page suggests not making any assumptions on the effect
1361 of %n on the result, so we don't.
1362 That is why we simply test num == 0. */
1370 /* Parse floating point value P of length LEN, using the C syntax for floats.
1371 Return 0 (false) if invalid, 1 (true) if valid.
1372 The successfully parsed number is stored in *D.
1373 Its type is taken from builtin_type (gdbarch) and is stored in *T. */
1376 parse_c_float (struct gdbarch
*gdbarch
, const char *p
, int len
,
1377 DOUBLEST
*d
, struct type
**t
)
1381 const struct builtin_type
*builtin_types
= builtin_type (gdbarch
);
1383 if (! parse_float (p
, len
, d
, &suffix
))
1386 suffix_len
= p
+ len
- suffix
;
1388 if (suffix_len
== 0)
1389 *t
= builtin_types
->builtin_double
;
1390 else if (suffix_len
== 1)
1392 /* Handle suffixes: 'f' for float, 'l' for long double. */
1393 if (tolower (*suffix
) == 'f')
1394 *t
= builtin_types
->builtin_float
;
1395 else if (tolower (*suffix
) == 'l')
1396 *t
= builtin_types
->builtin_long_double
;
1406 /* Stuff for maintaining a stack of types. Currently just used by C, but
1407 probably useful for any language which declares its types "backwards". */
1409 /* Ensure that there are HOWMUCH open slots on the type stack STACK. */
1412 type_stack_reserve (struct type_stack
*stack
, int howmuch
)
1414 if (stack
->depth
+ howmuch
>= stack
->size
)
1417 if (stack
->size
< howmuch
)
1418 stack
->size
= howmuch
;
1419 stack
->elements
= xrealloc (stack
->elements
,
1420 stack
->size
* sizeof (union type_stack_elt
));
1424 /* Ensure that there is a single open slot in the global type stack. */
1427 check_type_stack_depth (void)
1429 type_stack_reserve (&type_stack
, 1);
1432 /* A helper function for insert_type and insert_type_address_space.
1433 This does work of expanding the type stack and inserting the new
1434 element, ELEMENT, into the stack at location SLOT. */
1437 insert_into_type_stack (int slot
, union type_stack_elt element
)
1439 check_type_stack_depth ();
1441 if (slot
< type_stack
.depth
)
1442 memmove (&type_stack
.elements
[slot
+ 1], &type_stack
.elements
[slot
],
1443 (type_stack
.depth
- slot
) * sizeof (union type_stack_elt
));
1444 type_stack
.elements
[slot
] = element
;
1448 /* Insert a new type, TP, at the bottom of the type stack. If TP is
1449 tp_pointer or tp_reference, it is inserted at the bottom. If TP is
1450 a qualifier, it is inserted at slot 1 (just above a previous
1451 tp_pointer) if there is anything on the stack, or simply pushed if
1452 the stack is empty. Other values for TP are invalid. */
1455 insert_type (enum type_pieces tp
)
1457 union type_stack_elt element
;
1460 gdb_assert (tp
== tp_pointer
|| tp
== tp_reference
1461 || tp
== tp_const
|| tp
== tp_volatile
);
1463 /* If there is anything on the stack (we know it will be a
1464 tp_pointer), insert the qualifier above it. Otherwise, simply
1465 push this on the top of the stack. */
1466 if (type_stack
.depth
&& (tp
== tp_const
|| tp
== tp_volatile
))
1472 insert_into_type_stack (slot
, element
);
1476 push_type (enum type_pieces tp
)
1478 check_type_stack_depth ();
1479 type_stack
.elements
[type_stack
.depth
++].piece
= tp
;
1483 push_type_int (int n
)
1485 check_type_stack_depth ();
1486 type_stack
.elements
[type_stack
.depth
++].int_val
= n
;
1489 /* Insert a tp_space_identifier and the corresponding address space
1490 value into the stack. STRING is the name of an address space, as
1491 recognized by address_space_name_to_int. If the stack is empty,
1492 the new elements are simply pushed. If the stack is not empty,
1493 this function assumes that the first item on the stack is a
1494 tp_pointer, and the new values are inserted above the first
1498 insert_type_address_space (struct parser_state
*pstate
, char *string
)
1500 union type_stack_elt element
;
1503 /* If there is anything on the stack (we know it will be a
1504 tp_pointer), insert the address space qualifier above it.
1505 Otherwise, simply push this on the top of the stack. */
1506 if (type_stack
.depth
)
1511 element
.piece
= tp_space_identifier
;
1512 insert_into_type_stack (slot
, element
);
1513 element
.int_val
= address_space_name_to_int (parse_gdbarch (pstate
),
1515 insert_into_type_stack (slot
, element
);
1521 if (type_stack
.depth
)
1522 return type_stack
.elements
[--type_stack
.depth
].piece
;
1529 if (type_stack
.depth
)
1530 return type_stack
.elements
[--type_stack
.depth
].int_val
;
1531 /* "Can't happen". */
1535 /* Pop a type list element from the global type stack. */
1537 static VEC (type_ptr
) *
1540 gdb_assert (type_stack
.depth
);
1541 return type_stack
.elements
[--type_stack
.depth
].typelist_val
;
1544 /* Pop a type_stack element from the global type stack. */
1546 static struct type_stack
*
1547 pop_type_stack (void)
1549 gdb_assert (type_stack
.depth
);
1550 return type_stack
.elements
[--type_stack
.depth
].stack_val
;
1553 /* Append the elements of the type stack FROM to the type stack TO.
1554 Always returns TO. */
1557 append_type_stack (struct type_stack
*to
, struct type_stack
*from
)
1559 type_stack_reserve (to
, from
->depth
);
1561 memcpy (&to
->elements
[to
->depth
], &from
->elements
[0],
1562 from
->depth
* sizeof (union type_stack_elt
));
1563 to
->depth
+= from
->depth
;
1568 /* Push the type stack STACK as an element on the global type stack. */
1571 push_type_stack (struct type_stack
*stack
)
1573 check_type_stack_depth ();
1574 type_stack
.elements
[type_stack
.depth
++].stack_val
= stack
;
1575 push_type (tp_type_stack
);
1578 /* Copy the global type stack into a newly allocated type stack and
1579 return it. The global stack is cleared. The returned type stack
1580 must be freed with type_stack_cleanup. */
1583 get_type_stack (void)
1585 struct type_stack
*result
= XNEW (struct type_stack
);
1587 *result
= type_stack
;
1588 type_stack
.depth
= 0;
1589 type_stack
.size
= 0;
1590 type_stack
.elements
= NULL
;
1595 /* A cleanup function that destroys a single type stack. */
1598 type_stack_cleanup (void *arg
)
1600 struct type_stack
*stack
= arg
;
1602 xfree (stack
->elements
);
1606 /* Push a function type with arguments onto the global type stack.
1607 LIST holds the argument types. If the final item in LIST is NULL,
1608 then the function will be varargs. */
1611 push_typelist (VEC (type_ptr
) *list
)
1613 check_type_stack_depth ();
1614 type_stack
.elements
[type_stack
.depth
++].typelist_val
= list
;
1615 push_type (tp_function_with_arguments
);
1618 /* Pop the type stack and return the type which corresponds to FOLLOW_TYPE
1619 as modified by all the stuff on the stack. */
1621 follow_types (struct type
*follow_type
)
1625 int make_volatile
= 0;
1626 int make_addr_space
= 0;
1630 switch (pop_type ())
1635 follow_type
= make_cv_type (make_const
,
1636 TYPE_VOLATILE (follow_type
),
1639 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1642 if (make_addr_space
)
1643 follow_type
= make_type_with_address_space (follow_type
,
1645 make_const
= make_volatile
= 0;
1646 make_addr_space
= 0;
1654 case tp_space_identifier
:
1655 make_addr_space
= pop_type_int ();
1658 follow_type
= lookup_pointer_type (follow_type
);
1660 follow_type
= make_cv_type (make_const
,
1661 TYPE_VOLATILE (follow_type
),
1664 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1667 if (make_addr_space
)
1668 follow_type
= make_type_with_address_space (follow_type
,
1670 make_const
= make_volatile
= 0;
1671 make_addr_space
= 0;
1674 follow_type
= lookup_reference_type (follow_type
);
1676 follow_type
= make_cv_type (make_const
,
1677 TYPE_VOLATILE (follow_type
),
1680 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1683 if (make_addr_space
)
1684 follow_type
= make_type_with_address_space (follow_type
,
1686 make_const
= make_volatile
= 0;
1687 make_addr_space
= 0;
1690 array_size
= pop_type_int ();
1691 /* FIXME-type-allocation: need a way to free this type when we are
1694 lookup_array_range_type (follow_type
,
1695 0, array_size
>= 0 ? array_size
- 1 : 0);
1697 TYPE_HIGH_BOUND_KIND (TYPE_INDEX_TYPE (follow_type
))
1701 /* FIXME-type-allocation: need a way to free this type when we are
1703 follow_type
= lookup_function_type (follow_type
);
1706 case tp_function_with_arguments
:
1708 VEC (type_ptr
) *args
= pop_typelist ();
1711 = lookup_function_type_with_arguments (follow_type
,
1712 VEC_length (type_ptr
, args
),
1713 VEC_address (type_ptr
,
1715 VEC_free (type_ptr
, args
);
1721 struct type_stack
*stack
= pop_type_stack ();
1722 /* Sort of ugly, but not really much worse than the
1724 struct type_stack save
= type_stack
;
1726 type_stack
= *stack
;
1727 follow_type
= follow_types (follow_type
);
1728 gdb_assert (type_stack
.depth
== 0);
1734 gdb_assert_not_reached ("unrecognized tp_ value in follow_types");
1739 /* This function avoids direct calls to fprintf
1740 in the parser generated debug code. */
1742 parser_fprintf (FILE *x
, const char *y
, ...)
1748 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1751 fprintf_unfiltered (gdb_stderr
, " Unknown FILE used.\n");
1752 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1757 /* Implementation of the exp_descriptor method operator_check. */
1760 operator_check_standard (struct expression
*exp
, int pos
,
1761 int (*objfile_func
) (struct objfile
*objfile
,
1765 const union exp_element
*const elts
= exp
->elts
;
1766 struct type
*type
= NULL
;
1767 struct objfile
*objfile
= NULL
;
1769 /* Extended operators should have been already handled by exp_descriptor
1770 iterate method of its specific language. */
1771 gdb_assert (elts
[pos
].opcode
< OP_EXTENDED0
);
1773 /* Track the callers of write_exp_elt_type for this table. */
1775 switch (elts
[pos
].opcode
)
1788 type
= elts
[pos
+ 1].type
;
1793 LONGEST arg
, nargs
= elts
[pos
+ 1].longconst
;
1795 for (arg
= 0; arg
< nargs
; arg
++)
1797 struct type
*type
= elts
[pos
+ 2 + arg
].type
;
1798 struct objfile
*objfile
= TYPE_OBJFILE (type
);
1800 if (objfile
&& (*objfile_func
) (objfile
, data
))
1806 case UNOP_MEMVAL_TLS
:
1807 objfile
= elts
[pos
+ 1].objfile
;
1808 type
= elts
[pos
+ 2].type
;
1813 const struct block
*const block
= elts
[pos
+ 1].block
;
1814 const struct symbol
*const symbol
= elts
[pos
+ 2].symbol
;
1816 /* Check objfile where the variable itself is placed.
1817 SYMBOL_OBJ_SECTION (symbol) may be NULL. */
1818 if ((*objfile_func
) (symbol_objfile (symbol
), data
))
1821 /* Check objfile where is placed the code touching the variable. */
1822 objfile
= lookup_objfile_from_block (block
);
1824 type
= SYMBOL_TYPE (symbol
);
1829 /* Invoke callbacks for TYPE and OBJFILE if they were set as non-NULL. */
1831 if (type
&& TYPE_OBJFILE (type
)
1832 && (*objfile_func
) (TYPE_OBJFILE (type
), data
))
1834 if (objfile
&& (*objfile_func
) (objfile
, data
))
1840 /* Call OBJFILE_FUNC for any objfile found being referenced by EXP.
1841 OBJFILE_FUNC is never called with NULL OBJFILE. OBJFILE_FUNC get
1842 passed an arbitrary caller supplied DATA pointer. If OBJFILE_FUNC
1843 returns non-zero value then (any other) non-zero value is immediately
1844 returned to the caller. Otherwise zero is returned after iterating
1845 through whole EXP. */
1848 exp_iterate (struct expression
*exp
,
1849 int (*objfile_func
) (struct objfile
*objfile
, void *data
),
1854 for (endpos
= exp
->nelts
; endpos
> 0; )
1856 int pos
, args
, oplen
= 0;
1858 operator_length (exp
, endpos
, &oplen
, &args
);
1859 gdb_assert (oplen
> 0);
1861 pos
= endpos
- oplen
;
1862 if (exp
->language_defn
->la_exp_desc
->operator_check (exp
, pos
,
1863 objfile_func
, data
))
1872 /* Helper for exp_uses_objfile. */
1875 exp_uses_objfile_iter (struct objfile
*exp_objfile
, void *objfile_voidp
)
1877 struct objfile
*objfile
= objfile_voidp
;
1879 if (exp_objfile
->separate_debug_objfile_backlink
)
1880 exp_objfile
= exp_objfile
->separate_debug_objfile_backlink
;
1882 return exp_objfile
== objfile
;
1885 /* Return 1 if EXP uses OBJFILE (and will become dangling when OBJFILE
1886 is unloaded), otherwise return 0. OBJFILE must not be a separate debug info
1890 exp_uses_objfile (struct expression
*exp
, struct objfile
*objfile
)
1892 gdb_assert (objfile
->separate_debug_objfile_backlink
== NULL
);
1894 return exp_iterate (exp
, exp_uses_objfile_iter
, objfile
);
1897 /* See definition in parser-defs.h. */
1900 increase_expout_size (struct parser_state
*ps
, size_t lenelt
)
1902 if ((ps
->expout_ptr
+ lenelt
) >= ps
->expout_size
)
1904 ps
->expout_size
= max (ps
->expout_size
* 2,
1905 ps
->expout_ptr
+ lenelt
+ 10);
1906 ps
->expout
= (struct expression
*)
1907 xrealloc (ps
->expout
, (sizeof (struct expression
)
1908 + EXP_ELEM_TO_BYTES (ps
->expout_size
)));
1913 _initialize_parse (void)
1915 type_stack
.size
= 0;
1916 type_stack
.depth
= 0;
1917 type_stack
.elements
= NULL
;
1919 add_setshow_zuinteger_cmd ("expression", class_maintenance
,
1921 _("Set expression debugging."),
1922 _("Show expression debugging."),
1923 _("When non-zero, the internal representation "
1924 "of expressions will be printed."),
1926 show_expressiondebug
,
1927 &setdebuglist
, &showdebuglist
);
1928 add_setshow_boolean_cmd ("parser", class_maintenance
,
1930 _("Set parser debugging."),
1931 _("Show parser debugging."),
1932 _("When non-zero, expression parser "
1933 "tracing will be enabled."),
1936 &setdebuglist
, &showdebuglist
);