1 /* Parse expressions for GDB.
3 Copyright (C) 1986-2017 Free Software Foundation, Inc.
5 Modified from expread.y by the Department of Computer Science at the
6 State University of New York at Buffalo, 1991.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 /* Parse an expression from text in a string,
24 and return the result as a struct expression pointer.
25 That structure contains arithmetic operations in reverse polish,
26 with constants represented by operations that are followed by special data.
27 See expression.h for the details of the format.
28 What is important here is that it can be built up sequentially
29 during the process of parsing; the lower levels of the tree always
30 come first in the result. */
34 #include "arch-utils.h"
38 #include "expression.h"
43 #include "parser-defs.h"
45 #include "symfile.h" /* for overlay functions */
51 #include "user-regs.h"
53 #include "common/gdb_optional.h"
55 /* Standard set of definitions for printing, dumping, prefixifying,
56 * and evaluating expressions. */
58 const struct exp_descriptor exp_descriptor_standard
=
60 print_subexp_standard
,
61 operator_length_standard
,
62 operator_check_standard
,
64 dump_subexp_body_standard
,
65 evaluate_subexp_standard
68 /* Global variables declared in parser-defs.h (and commented there). */
69 const struct block
*expression_context_block
;
70 CORE_ADDR expression_context_pc
;
71 const struct block
*innermost_block
;
73 static struct type_stack type_stack
;
75 const char *prev_lexptr
;
79 /* True if parsing an expression to attempt completion. */
82 /* The index of the last struct expression directly before a '.' or
83 '->'. This is set when parsing and is only used when completing a
84 field name. It is -1 if no dereference operation was found. */
85 static int expout_last_struct
= -1;
87 /* If we are completing a tagged type name, this will be nonzero. */
88 static enum type_code expout_tag_completion_type
= TYPE_CODE_UNDEF
;
90 /* The token for tagged type name completion. */
91 static char *expout_completion_name
;
94 static unsigned int expressiondebug
= 0;
96 show_expressiondebug (struct ui_file
*file
, int from_tty
,
97 struct cmd_list_element
*c
, const char *value
)
99 fprintf_filtered (file
, _("Expression debugging is %s.\n"), value
);
103 /* Non-zero if an expression parser should set yydebug. */
107 show_parserdebug (struct ui_file
*file
, int from_tty
,
108 struct cmd_list_element
*c
, const char *value
)
110 fprintf_filtered (file
, _("Parser debugging is %s.\n"), value
);
114 static int prefixify_subexp (struct expression
*, struct expression
*, int,
117 static expression_up
parse_exp_in_context (const char **, CORE_ADDR
,
118 const struct block
*, int,
120 static expression_up
parse_exp_in_context_1 (const char **, CORE_ADDR
,
121 const struct block
*, int,
124 void _initialize_parse (void);
126 /* Data structure for saving values of arglist_len for function calls whose
127 arguments contain other function calls. */
129 static std::vector
<int> *funcall_chain
;
131 /* Begin counting arguments for a function call,
132 saving the data about any containing call. */
137 funcall_chain
->push_back (arglist_len
);
141 /* Return the number of arguments in a function call just terminated,
142 and restore the data for the containing function call. */
147 int val
= arglist_len
;
148 arglist_len
= funcall_chain
->back ();
149 funcall_chain
->pop_back ();
155 /* See definition in parser-defs.h. */
158 initialize_expout (struct parser_state
*ps
, size_t initial_size
,
159 const struct language_defn
*lang
,
160 struct gdbarch
*gdbarch
)
162 ps
->expout_size
= initial_size
;
165 = (struct expression
*) xmalloc (sizeof (struct expression
)
166 + EXP_ELEM_TO_BYTES (ps
->expout_size
));
167 ps
->expout
->language_defn
= lang
;
168 ps
->expout
->gdbarch
= gdbarch
;
171 /* See definition in parser-defs.h. */
174 reallocate_expout (struct parser_state
*ps
)
176 /* Record the actual number of expression elements, and then
177 reallocate the expression memory so that we free up any
180 ps
->expout
->nelts
= ps
->expout_ptr
;
181 ps
->expout
= (struct expression
*)
182 xrealloc (ps
->expout
,
183 sizeof (struct expression
)
184 + EXP_ELEM_TO_BYTES (ps
->expout_ptr
));
187 /* This page contains the functions for adding data to the struct expression
188 being constructed. */
190 /* Add one element to the end of the expression. */
192 /* To avoid a bug in the Sun 4 compiler, we pass things that can fit into
193 a register through here. */
196 write_exp_elt (struct parser_state
*ps
, const union exp_element
*expelt
)
198 if (ps
->expout_ptr
>= ps
->expout_size
)
200 ps
->expout_size
*= 2;
201 ps
->expout
= (struct expression
*)
202 xrealloc (ps
->expout
, sizeof (struct expression
)
203 + EXP_ELEM_TO_BYTES (ps
->expout_size
));
205 ps
->expout
->elts
[ps
->expout_ptr
++] = *expelt
;
209 write_exp_elt_opcode (struct parser_state
*ps
, enum exp_opcode expelt
)
211 union exp_element tmp
;
213 memset (&tmp
, 0, sizeof (union exp_element
));
215 write_exp_elt (ps
, &tmp
);
219 write_exp_elt_sym (struct parser_state
*ps
, struct symbol
*expelt
)
221 union exp_element tmp
;
223 memset (&tmp
, 0, sizeof (union exp_element
));
225 write_exp_elt (ps
, &tmp
);
229 write_exp_elt_msym (struct parser_state
*ps
, minimal_symbol
*expelt
)
231 union exp_element tmp
;
233 memset (&tmp
, 0, sizeof (union exp_element
));
234 tmp
.msymbol
= expelt
;
235 write_exp_elt (ps
, &tmp
);
239 write_exp_elt_block (struct parser_state
*ps
, const struct block
*b
)
241 union exp_element tmp
;
243 memset (&tmp
, 0, sizeof (union exp_element
));
245 write_exp_elt (ps
, &tmp
);
249 write_exp_elt_objfile (struct parser_state
*ps
, struct objfile
*objfile
)
251 union exp_element tmp
;
253 memset (&tmp
, 0, sizeof (union exp_element
));
254 tmp
.objfile
= objfile
;
255 write_exp_elt (ps
, &tmp
);
259 write_exp_elt_longcst (struct parser_state
*ps
, LONGEST expelt
)
261 union exp_element tmp
;
263 memset (&tmp
, 0, sizeof (union exp_element
));
264 tmp
.longconst
= expelt
;
265 write_exp_elt (ps
, &tmp
);
269 write_exp_elt_dblcst (struct parser_state
*ps
, DOUBLEST expelt
)
271 union exp_element tmp
;
273 memset (&tmp
, 0, sizeof (union exp_element
));
274 tmp
.doubleconst
= expelt
;
275 write_exp_elt (ps
, &tmp
);
279 write_exp_elt_decfloatcst (struct parser_state
*ps
, gdb_byte expelt
[16])
281 union exp_element tmp
;
284 for (index
= 0; index
< 16; index
++)
285 tmp
.decfloatconst
[index
] = expelt
[index
];
287 write_exp_elt (ps
, &tmp
);
291 write_exp_elt_type (struct parser_state
*ps
, struct type
*expelt
)
293 union exp_element tmp
;
295 memset (&tmp
, 0, sizeof (union exp_element
));
297 write_exp_elt (ps
, &tmp
);
301 write_exp_elt_intern (struct parser_state
*ps
, struct internalvar
*expelt
)
303 union exp_element tmp
;
305 memset (&tmp
, 0, sizeof (union exp_element
));
306 tmp
.internalvar
= expelt
;
307 write_exp_elt (ps
, &tmp
);
310 /* Add a string constant to the end of the expression.
312 String constants are stored by first writing an expression element
313 that contains the length of the string, then stuffing the string
314 constant itself into however many expression elements are needed
315 to hold it, and then writing another expression element that contains
316 the length of the string. I.e. an expression element at each end of
317 the string records the string length, so you can skip over the
318 expression elements containing the actual string bytes from either
319 end of the string. Note that this also allows gdb to handle
320 strings with embedded null bytes, as is required for some languages.
322 Don't be fooled by the fact that the string is null byte terminated,
323 this is strictly for the convenience of debugging gdb itself.
324 Gdb does not depend up the string being null terminated, since the
325 actual length is recorded in expression elements at each end of the
326 string. The null byte is taken into consideration when computing how
327 many expression elements are required to hold the string constant, of
332 write_exp_string (struct parser_state
*ps
, struct stoken str
)
334 int len
= str
.length
;
338 /* Compute the number of expression elements required to hold the string
339 (including a null byte terminator), along with one expression element
340 at each end to record the actual string length (not including the
341 null byte terminator). */
343 lenelt
= 2 + BYTES_TO_EXP_ELEM (len
+ 1);
345 increase_expout_size (ps
, lenelt
);
347 /* Write the leading length expression element (which advances the current
348 expression element index), then write the string constant followed by a
349 terminating null byte, and then write the trailing length expression
352 write_exp_elt_longcst (ps
, (LONGEST
) len
);
353 strdata
= (char *) &ps
->expout
->elts
[ps
->expout_ptr
];
354 memcpy (strdata
, str
.ptr
, len
);
355 *(strdata
+ len
) = '\0';
356 ps
->expout_ptr
+= lenelt
- 2;
357 write_exp_elt_longcst (ps
, (LONGEST
) len
);
360 /* Add a vector of string constants to the end of the expression.
362 This adds an OP_STRING operation, but encodes the contents
363 differently from write_exp_string. The language is expected to
364 handle evaluation of this expression itself.
366 After the usual OP_STRING header, TYPE is written into the
367 expression as a long constant. The interpretation of this field is
368 up to the language evaluator.
370 Next, each string in VEC is written. The length is written as a
371 long constant, followed by the contents of the string. */
374 write_exp_string_vector (struct parser_state
*ps
, int type
,
375 struct stoken_vector
*vec
)
380 /* Compute the size. We compute the size in number of slots to
381 avoid issues with string padding. */
383 for (i
= 0; i
< vec
->len
; ++i
)
385 /* One slot for the length of this element, plus the number of
386 slots needed for this string. */
387 n_slots
+= 1 + BYTES_TO_EXP_ELEM (vec
->tokens
[i
].length
);
390 /* One more slot for the type of the string. */
393 /* Now compute a phony string length. */
394 len
= EXP_ELEM_TO_BYTES (n_slots
) - 1;
397 increase_expout_size (ps
, n_slots
);
399 write_exp_elt_opcode (ps
, OP_STRING
);
400 write_exp_elt_longcst (ps
, len
);
401 write_exp_elt_longcst (ps
, type
);
403 for (i
= 0; i
< vec
->len
; ++i
)
405 write_exp_elt_longcst (ps
, vec
->tokens
[i
].length
);
406 memcpy (&ps
->expout
->elts
[ps
->expout_ptr
], vec
->tokens
[i
].ptr
,
407 vec
->tokens
[i
].length
);
408 ps
->expout_ptr
+= BYTES_TO_EXP_ELEM (vec
->tokens
[i
].length
);
411 write_exp_elt_longcst (ps
, len
);
412 write_exp_elt_opcode (ps
, OP_STRING
);
415 /* Add a bitstring constant to the end of the expression.
417 Bitstring constants are stored by first writing an expression element
418 that contains the length of the bitstring (in bits), then stuffing the
419 bitstring constant itself into however many expression elements are
420 needed to hold it, and then writing another expression element that
421 contains the length of the bitstring. I.e. an expression element at
422 each end of the bitstring records the bitstring length, so you can skip
423 over the expression elements containing the actual bitstring bytes from
424 either end of the bitstring. */
427 write_exp_bitstring (struct parser_state
*ps
, struct stoken str
)
429 int bits
= str
.length
; /* length in bits */
430 int len
= (bits
+ HOST_CHAR_BIT
- 1) / HOST_CHAR_BIT
;
434 /* Compute the number of expression elements required to hold the bitstring,
435 along with one expression element at each end to record the actual
436 bitstring length in bits. */
438 lenelt
= 2 + BYTES_TO_EXP_ELEM (len
);
440 increase_expout_size (ps
, lenelt
);
442 /* Write the leading length expression element (which advances the current
443 expression element index), then write the bitstring constant, and then
444 write the trailing length expression element. */
446 write_exp_elt_longcst (ps
, (LONGEST
) bits
);
447 strdata
= (char *) &ps
->expout
->elts
[ps
->expout_ptr
];
448 memcpy (strdata
, str
.ptr
, len
);
449 ps
->expout_ptr
+= lenelt
- 2;
450 write_exp_elt_longcst (ps
, (LONGEST
) bits
);
453 /* Return the type of MSYMBOL, a minimal symbol of OBJFILE. If
454 ADDRESS_P is not NULL, set it to the MSYMBOL's resolved
458 find_minsym_type_and_address (minimal_symbol
*msymbol
,
459 struct objfile
*objfile
,
460 CORE_ADDR
*address_p
)
462 bound_minimal_symbol bound_msym
= {msymbol
, objfile
};
463 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
464 struct obj_section
*section
= MSYMBOL_OBJ_SECTION (objfile
, msymbol
);
465 enum minimal_symbol_type type
= MSYMBOL_TYPE (msymbol
);
468 bool is_tls
= (section
!= NULL
469 && section
->the_bfd_section
->flags
& SEC_THREAD_LOCAL
);
471 /* Addresses of TLS symbols are really offsets into a
472 per-objfile/per-thread storage block. */
473 CORE_ADDR addr
= (is_tls
474 ? MSYMBOL_VALUE_RAW_ADDRESS (bound_msym
.minsym
)
475 : BMSYMBOL_VALUE_ADDRESS (bound_msym
));
477 /* The minimal symbol might point to a function descriptor;
478 resolve it to the actual code address instead. */
479 pc
= gdbarch_convert_from_func_ptr_addr (gdbarch
, addr
, ¤t_target
);
482 struct bound_minimal_symbol ifunc_msym
= lookup_minimal_symbol_by_pc (pc
);
484 /* In this case, assume we have a code symbol instead of
487 if (ifunc_msym
.minsym
!= NULL
488 && MSYMBOL_TYPE (ifunc_msym
.minsym
) == mst_text_gnu_ifunc
489 && BMSYMBOL_VALUE_ADDRESS (ifunc_msym
) == pc
)
491 /* A function descriptor has been resolved but PC is still in the
492 STT_GNU_IFUNC resolver body (such as because inferior does not
493 run to be able to call it). */
495 type
= mst_text_gnu_ifunc
;
503 if (overlay_debugging
)
504 addr
= symbol_overlayed_address (addr
, section
);
508 /* Skip translation if caller does not need the address. */
509 if (address_p
!= NULL
)
510 *address_p
= target_translate_tls_address (objfile
, addr
);
511 return objfile_type (objfile
)->nodebug_tls_symbol
;
514 if (address_p
!= NULL
)
517 struct type
*the_type
;
523 case mst_solib_trampoline
:
524 return objfile_type (objfile
)->nodebug_text_symbol
;
526 case mst_text_gnu_ifunc
:
527 return objfile_type (objfile
)->nodebug_text_gnu_ifunc_symbol
;
533 return objfile_type (objfile
)->nodebug_data_symbol
;
535 case mst_slot_got_plt
:
536 return objfile_type (objfile
)->nodebug_got_plt_symbol
;
539 return objfile_type (objfile
)->nodebug_unknown_symbol
;
543 /* Add the appropriate elements for a minimal symbol to the end of
547 write_exp_msymbol (struct parser_state
*ps
,
548 struct bound_minimal_symbol bound_msym
)
550 write_exp_elt_opcode (ps
, OP_VAR_MSYM_VALUE
);
551 write_exp_elt_objfile (ps
, bound_msym
.objfile
);
552 write_exp_elt_msym (ps
, bound_msym
.minsym
);
553 write_exp_elt_opcode (ps
, OP_VAR_MSYM_VALUE
);
556 /* Mark the current index as the starting location of a structure
557 expression. This is used when completing on field names. */
560 mark_struct_expression (struct parser_state
*ps
)
562 gdb_assert (parse_completion
563 && expout_tag_completion_type
== TYPE_CODE_UNDEF
);
564 expout_last_struct
= ps
->expout_ptr
;
567 /* Indicate that the current parser invocation is completing a tag.
568 TAG is the type code of the tag, and PTR and LENGTH represent the
569 start of the tag name. */
572 mark_completion_tag (enum type_code tag
, const char *ptr
, int length
)
574 gdb_assert (parse_completion
575 && expout_tag_completion_type
== TYPE_CODE_UNDEF
576 && expout_completion_name
== NULL
577 && expout_last_struct
== -1);
578 gdb_assert (tag
== TYPE_CODE_UNION
579 || tag
== TYPE_CODE_STRUCT
580 || tag
== TYPE_CODE_ENUM
);
581 expout_tag_completion_type
= tag
;
582 expout_completion_name
= (char *) xmalloc (length
+ 1);
583 memcpy (expout_completion_name
, ptr
, length
);
584 expout_completion_name
[length
] = '\0';
588 /* Recognize tokens that start with '$'. These include:
590 $regname A native register name or a "standard
593 $variable A convenience variable with a name chosen
596 $digits Value history with index <digits>, starting
597 from the first value which has index 1.
599 $$digits Value history with index <digits> relative
600 to the last value. I.e. $$0 is the last
601 value, $$1 is the one previous to that, $$2
602 is the one previous to $$1, etc.
604 $ | $0 | $$0 The last value in the value history.
606 $$ An abbreviation for the second to the last
607 value in the value history, I.e. $$1 */
610 write_dollar_variable (struct parser_state
*ps
, struct stoken str
)
612 struct block_symbol sym
;
613 struct bound_minimal_symbol msym
;
614 struct internalvar
*isym
= NULL
;
616 /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1)
617 and $$digits (equivalent to $<-digits> if you could type that). */
621 /* Double dollar means negate the number and add -1 as well.
622 Thus $$ alone means -1. */
623 if (str
.length
>= 2 && str
.ptr
[1] == '$')
630 /* Just dollars (one or two). */
634 /* Is the rest of the token digits? */
635 for (; i
< str
.length
; i
++)
636 if (!(str
.ptr
[i
] >= '0' && str
.ptr
[i
] <= '9'))
640 i
= atoi (str
.ptr
+ 1 + negate
);
646 /* Handle tokens that refer to machine registers:
647 $ followed by a register name. */
648 i
= user_reg_map_name_to_regnum (parse_gdbarch (ps
),
649 str
.ptr
+ 1, str
.length
- 1);
651 goto handle_register
;
653 /* Any names starting with $ are probably debugger internal variables. */
655 isym
= lookup_only_internalvar (copy_name (str
) + 1);
658 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
659 write_exp_elt_intern (ps
, isym
);
660 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
664 /* On some systems, such as HP-UX and hppa-linux, certain system routines
665 have names beginning with $ or $$. Check for those, first. */
667 sym
= lookup_symbol (copy_name (str
), (struct block
*) NULL
,
671 write_exp_elt_opcode (ps
, OP_VAR_VALUE
);
672 write_exp_elt_block (ps
, sym
.block
);
673 write_exp_elt_sym (ps
, sym
.symbol
);
674 write_exp_elt_opcode (ps
, OP_VAR_VALUE
);
677 msym
= lookup_bound_minimal_symbol (copy_name (str
));
680 write_exp_msymbol (ps
, msym
);
684 /* Any other names are assumed to be debugger internal variables. */
686 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
687 write_exp_elt_intern (ps
, create_internalvar (copy_name (str
) + 1));
688 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
691 write_exp_elt_opcode (ps
, OP_LAST
);
692 write_exp_elt_longcst (ps
, (LONGEST
) i
);
693 write_exp_elt_opcode (ps
, OP_LAST
);
696 write_exp_elt_opcode (ps
, OP_REGISTER
);
699 write_exp_string (ps
, str
);
700 write_exp_elt_opcode (ps
, OP_REGISTER
);
706 find_template_name_end (const char *p
)
709 int just_seen_right
= 0;
710 int just_seen_colon
= 0;
711 int just_seen_space
= 0;
713 if (!p
|| (*p
!= '<'))
724 /* In future, may want to allow these?? */
727 depth
++; /* start nested template */
728 if (just_seen_colon
|| just_seen_right
|| just_seen_space
)
729 return 0; /* but not after : or :: or > or space */
732 if (just_seen_colon
|| just_seen_right
)
733 return 0; /* end a (nested?) template */
734 just_seen_right
= 1; /* but not after : or :: */
735 if (--depth
== 0) /* also disallow >>, insist on > > */
736 return ++p
; /* if outermost ended, return */
739 if (just_seen_space
|| (just_seen_colon
> 1))
740 return 0; /* nested class spec coming up */
741 just_seen_colon
++; /* we allow :: but not :::: */
746 if (!((*p
>= 'a' && *p
<= 'z') || /* allow token chars */
747 (*p
>= 'A' && *p
<= 'Z') ||
748 (*p
>= '0' && *p
<= '9') ||
749 (*p
== '_') || (*p
== ',') || /* commas for template args */
750 (*p
== '&') || (*p
== '*') || /* pointer and ref types */
751 (*p
== '(') || (*p
== ')') || /* function types */
752 (*p
== '[') || (*p
== ']'))) /* array types */
766 /* Return a null-terminated temporary copy of the name of a string token.
768 Tokens that refer to names do so with explicit pointer and length,
769 so they can share the storage that lexptr is parsing.
770 When it is necessary to pass a name to a function that expects
771 a null-terminated string, the substring is copied out
772 into a separate block of storage.
774 N.B. A single buffer is reused on each call. */
777 copy_name (struct stoken token
)
779 /* A temporary buffer for identifiers, so we can null-terminate them.
780 We allocate this with xrealloc. parse_exp_1 used to allocate with
781 alloca, using the size of the whole expression as a conservative
782 estimate of the space needed. However, macro expansion can
783 introduce names longer than the original expression; there's no
784 practical way to know beforehand how large that might be. */
785 static char *namecopy
;
786 static size_t namecopy_size
;
788 /* Make sure there's enough space for the token. */
789 if (namecopy_size
< token
.length
+ 1)
791 namecopy_size
= token
.length
+ 1;
792 namecopy
= (char *) xrealloc (namecopy
, token
.length
+ 1);
795 memcpy (namecopy
, token
.ptr
, token
.length
);
796 namecopy
[token
.length
] = 0;
802 /* See comments on parser-defs.h. */
805 prefixify_expression (struct expression
*expr
)
807 int len
= sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expr
->nelts
);
808 struct expression
*temp
;
809 int inpos
= expr
->nelts
, outpos
= 0;
811 temp
= (struct expression
*) alloca (len
);
813 /* Copy the original expression into temp. */
814 memcpy (temp
, expr
, len
);
816 return prefixify_subexp (temp
, expr
, inpos
, outpos
);
819 /* Return the number of exp_elements in the postfix subexpression
820 of EXPR whose operator is at index ENDPOS - 1 in EXPR. */
823 length_of_subexp (struct expression
*expr
, int endpos
)
827 operator_length (expr
, endpos
, &oplen
, &args
);
831 oplen
+= length_of_subexp (expr
, endpos
- oplen
);
838 /* Sets *OPLENP to the length of the operator whose (last) index is
839 ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that
843 operator_length (const struct expression
*expr
, int endpos
, int *oplenp
,
846 expr
->language_defn
->la_exp_desc
->operator_length (expr
, endpos
,
850 /* Default value for operator_length in exp_descriptor vectors. */
853 operator_length_standard (const struct expression
*expr
, int endpos
,
854 int *oplenp
, int *argsp
)
858 enum range_type range_type
;
862 error (_("?error in operator_length_standard"));
864 i
= (int) expr
->elts
[endpos
- 1].opcode
;
870 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
871 oplen
= 5 + BYTES_TO_EXP_ELEM (oplen
+ 1);
878 case OP_VAR_MSYM_VALUE
:
882 case OP_FUNC_STATIC_VAR
:
883 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
884 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
892 case OP_VAR_ENTRY_VALUE
:
902 case OP_F77_UNDETERMINED_ARGLIST
:
904 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
908 oplen
= 5 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
912 case OP_OBJC_MSGCALL
: /* Objective C message (method) call. */
914 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
923 case UNOP_DYNAMIC_CAST
:
924 case UNOP_REINTERPRET_CAST
:
925 case UNOP_MEMVAL_TYPE
:
953 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
954 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
959 case STRUCTOP_STRUCT
:
966 case OP_OBJC_NSSTRING
: /* Objective C Foundation Class
967 NSString constant. */
968 case OP_OBJC_SELECTOR
: /* Objective C "@selector" pseudo-op. */
970 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
971 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
976 args
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
977 args
-= longest_to_int (expr
->elts
[endpos
- 3].longconst
);
987 case MULTI_SUBSCRIPT
:
989 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
992 case BINOP_ASSIGN_MODIFY
:
1004 range_type
= (enum range_type
)
1005 longest_to_int (expr
->elts
[endpos
- 2].longconst
);
1009 case LOW_BOUND_DEFAULT
:
1010 case HIGH_BOUND_DEFAULT
:
1013 case BOTH_BOUND_DEFAULT
:
1016 case NONE_BOUND_DEFAULT
:
1024 args
= 1 + (i
< (int) BINOP_END
);
1031 /* Copy the subexpression ending just before index INEND in INEXPR
1032 into OUTEXPR, starting at index OUTBEG.
1033 In the process, convert it from suffix to prefix form.
1034 If EXPOUT_LAST_STRUCT is -1, then this function always returns -1.
1035 Otherwise, it returns the index of the subexpression which is the
1036 left-hand-side of the expression at EXPOUT_LAST_STRUCT. */
1039 prefixify_subexp (struct expression
*inexpr
,
1040 struct expression
*outexpr
, int inend
, int outbeg
)
1048 operator_length (inexpr
, inend
, &oplen
, &args
);
1050 /* Copy the final operator itself, from the end of the input
1051 to the beginning of the output. */
1053 memcpy (&outexpr
->elts
[outbeg
], &inexpr
->elts
[inend
],
1054 EXP_ELEM_TO_BYTES (oplen
));
1057 if (expout_last_struct
== inend
)
1058 result
= outbeg
- oplen
;
1060 /* Find the lengths of the arg subexpressions. */
1061 arglens
= (int *) alloca (args
* sizeof (int));
1062 for (i
= args
- 1; i
>= 0; i
--)
1064 oplen
= length_of_subexp (inexpr
, inend
);
1069 /* Now copy each subexpression, preserving the order of
1070 the subexpressions, but prefixifying each one.
1071 In this loop, inend starts at the beginning of
1072 the expression this level is working on
1073 and marches forward over the arguments.
1074 outbeg does similarly in the output. */
1075 for (i
= 0; i
< args
; i
++)
1081 r
= prefixify_subexp (inexpr
, outexpr
, inend
, outbeg
);
1084 /* Return immediately. We probably have only parsed a
1085 partial expression, so we don't want to try to reverse
1086 the other operands. */
1095 /* Read an expression from the string *STRINGPTR points to,
1096 parse it, and return a pointer to a struct expression that we malloc.
1097 Use block BLOCK as the lexical context for variable names;
1098 if BLOCK is zero, use the block of the selected stack frame.
1099 Meanwhile, advance *STRINGPTR to point after the expression,
1100 at the first nonwhite character that is not part of the expression
1101 (possibly a null character).
1103 If COMMA is nonzero, stop if a comma is reached. */
1106 parse_exp_1 (const char **stringptr
, CORE_ADDR pc
, const struct block
*block
,
1109 return parse_exp_in_context (stringptr
, pc
, block
, comma
, 0, NULL
);
1112 static expression_up
1113 parse_exp_in_context (const char **stringptr
, CORE_ADDR pc
,
1114 const struct block
*block
,
1115 int comma
, int void_context_p
, int *out_subexp
)
1117 return parse_exp_in_context_1 (stringptr
, pc
, block
, comma
,
1118 void_context_p
, out_subexp
);
1121 /* As for parse_exp_1, except that if VOID_CONTEXT_P, then
1122 no value is expected from the expression.
1123 OUT_SUBEXP is set when attempting to complete a field name; in this
1124 case it is set to the index of the subexpression on the
1125 left-hand-side of the struct op. If not doing such completion, it
1126 is left untouched. */
1128 static expression_up
1129 parse_exp_in_context_1 (const char **stringptr
, CORE_ADDR pc
,
1130 const struct block
*block
,
1131 int comma
, int void_context_p
, int *out_subexp
)
1133 const struct language_defn
*lang
= NULL
;
1134 struct parser_state ps
;
1137 lexptr
= *stringptr
;
1141 type_stack
.depth
= 0;
1142 expout_last_struct
= -1;
1143 expout_tag_completion_type
= TYPE_CODE_UNDEF
;
1144 xfree (expout_completion_name
);
1145 expout_completion_name
= NULL
;
1147 comma_terminates
= comma
;
1149 if (lexptr
== 0 || *lexptr
== 0)
1150 error_no_arg (_("expression to compute"));
1152 std::vector
<int> funcalls
;
1153 scoped_restore save_funcall_chain
= make_scoped_restore (&funcall_chain
,
1156 expression_context_block
= block
;
1158 /* If no context specified, try using the current frame, if any. */
1159 if (!expression_context_block
)
1160 expression_context_block
= get_selected_block (&expression_context_pc
);
1162 expression_context_pc
= BLOCK_START (expression_context_block
);
1164 expression_context_pc
= pc
;
1166 /* Fall back to using the current source static context, if any. */
1168 if (!expression_context_block
)
1170 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
1172 expression_context_block
1173 = BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (cursal
.symtab
),
1175 if (expression_context_block
)
1176 expression_context_pc
= BLOCK_START (expression_context_block
);
1179 if (language_mode
== language_mode_auto
&& block
!= NULL
)
1181 /* Find the language associated to the given context block.
1182 Default to the current language if it can not be determined.
1184 Note that using the language corresponding to the current frame
1185 can sometimes give unexpected results. For instance, this
1186 routine is often called several times during the inferior
1187 startup phase to re-parse breakpoint expressions after
1188 a new shared library has been loaded. The language associated
1189 to the current frame at this moment is not relevant for
1190 the breakpoint. Using it would therefore be silly, so it seems
1191 better to rely on the current language rather than relying on
1192 the current frame language to parse the expression. That's why
1193 we do the following language detection only if the context block
1194 has been specifically provided. */
1195 struct symbol
*func
= block_linkage_function (block
);
1198 lang
= language_def (SYMBOL_LANGUAGE (func
));
1199 if (lang
== NULL
|| lang
->la_language
== language_unknown
)
1200 lang
= current_language
;
1203 lang
= current_language
;
1205 /* get_current_arch may reset CURRENT_LANGUAGE via select_frame.
1206 While we need CURRENT_LANGUAGE to be set to LANG (for lookup_symbol
1207 and others called from *.y) ensure CURRENT_LANGUAGE gets restored
1208 to the value matching SELECTED_FRAME as set by get_current_arch. */
1210 initialize_expout (&ps
, 10, lang
, get_current_arch ());
1212 scoped_restore_current_language lang_saver
;
1213 set_language (lang
->la_language
);
1217 if (lang
->la_parser (&ps
))
1218 lang
->la_error (NULL
);
1220 CATCH (except
, RETURN_MASK_ALL
)
1222 if (! parse_completion
)
1225 throw_exception (except
);
1230 reallocate_expout (&ps
);
1232 /* Convert expression from postfix form as generated by yacc
1233 parser, to a prefix form. */
1235 if (expressiondebug
)
1236 dump_raw_expression (ps
.expout
, gdb_stdlog
,
1237 "before conversion to prefix form");
1239 subexp
= prefixify_expression (ps
.expout
);
1241 *out_subexp
= subexp
;
1243 lang
->la_post_parser (&ps
.expout
, void_context_p
);
1245 if (expressiondebug
)
1246 dump_prefix_expression (ps
.expout
, gdb_stdlog
);
1248 *stringptr
= lexptr
;
1249 return expression_up (ps
.expout
);
1252 /* Parse STRING as an expression, and complain if this fails
1253 to use up all of the contents of STRING. */
1256 parse_expression (const char *string
)
1258 expression_up exp
= parse_exp_1 (&string
, 0, 0, 0);
1260 error (_("Junk after end of expression."));
1264 /* Same as parse_expression, but using the given language (LANG)
1265 to parse the expression. */
1268 parse_expression_with_language (const char *string
, enum language lang
)
1270 gdb::optional
<scoped_restore_current_language
> lang_saver
;
1271 if (current_language
->la_language
!= lang
)
1273 lang_saver
.emplace ();
1274 set_language (lang
);
1277 return parse_expression (string
);
1280 /* Parse STRING as an expression. If parsing ends in the middle of a
1281 field reference, return the type of the left-hand-side of the
1282 reference; furthermore, if the parsing ends in the field name,
1283 return the field name in *NAME. If the parsing ends in the middle
1284 of a field reference, but the reference is somehow invalid, throw
1285 an exception. In all other cases, return NULL. Returned non-NULL
1286 *NAME must be freed by the caller. */
1289 parse_expression_for_completion (const char *string
, char **name
,
1290 enum type_code
*code
)
1298 parse_completion
= 1;
1299 exp
= parse_exp_in_context (&string
, 0, 0, 0, 0, &subexp
);
1301 CATCH (except
, RETURN_MASK_ERROR
)
1303 /* Nothing, EXP remains NULL. */
1307 parse_completion
= 0;
1311 if (expout_tag_completion_type
!= TYPE_CODE_UNDEF
)
1313 *code
= expout_tag_completion_type
;
1314 *name
= expout_completion_name
;
1315 expout_completion_name
= NULL
;
1319 if (expout_last_struct
== -1)
1322 *name
= extract_field_op (exp
.get (), &subexp
);
1326 /* This might throw an exception. If so, we want to let it
1328 val
= evaluate_subexpression_type (exp
.get (), subexp
);
1329 /* (*NAME) is a part of the EXP memory block freed below. */
1330 *name
= xstrdup (*name
);
1332 return value_type (val
);
1335 /* A post-parser that does nothing. */
1338 null_post_parser (struct expression
**exp
, int void_context_p
)
1342 /* Parse floating point value P of length LEN.
1343 Return 0 (false) if invalid, 1 (true) if valid.
1344 The successfully parsed number is stored in D.
1345 *SUFFIX points to the suffix of the number in P.
1347 NOTE: This accepts the floating point syntax that sscanf accepts. */
1350 parse_float (const char *p
, int len
, DOUBLEST
*d
, const char **suffix
)
1355 copy
= (char *) xmalloc (len
+ 1);
1356 memcpy (copy
, p
, len
);
1359 num
= sscanf (copy
, "%" DOUBLEST_SCAN_FORMAT
"%n", d
, &n
);
1362 /* The sscanf man page suggests not making any assumptions on the effect
1363 of %n on the result, so we don't.
1364 That is why we simply test num == 0. */
1372 /* Parse floating point value P of length LEN, using the C syntax for floats.
1373 Return 0 (false) if invalid, 1 (true) if valid.
1374 The successfully parsed number is stored in *D.
1375 Its type is taken from builtin_type (gdbarch) and is stored in *T. */
1378 parse_c_float (struct gdbarch
*gdbarch
, const char *p
, int len
,
1379 DOUBLEST
*d
, struct type
**t
)
1383 const struct builtin_type
*builtin_types
= builtin_type (gdbarch
);
1385 if (! parse_float (p
, len
, d
, &suffix
))
1388 suffix_len
= p
+ len
- suffix
;
1390 if (suffix_len
== 0)
1391 *t
= builtin_types
->builtin_double
;
1392 else if (suffix_len
== 1)
1394 /* Handle suffixes: 'f' for float, 'l' for long double. */
1395 if (tolower (*suffix
) == 'f')
1396 *t
= builtin_types
->builtin_float
;
1397 else if (tolower (*suffix
) == 'l')
1398 *t
= builtin_types
->builtin_long_double
;
1408 /* Stuff for maintaining a stack of types. Currently just used by C, but
1409 probably useful for any language which declares its types "backwards". */
1411 /* Ensure that there are HOWMUCH open slots on the type stack STACK. */
1414 type_stack_reserve (struct type_stack
*stack
, int howmuch
)
1416 if (stack
->depth
+ howmuch
>= stack
->size
)
1419 if (stack
->size
< howmuch
)
1420 stack
->size
= howmuch
;
1421 stack
->elements
= XRESIZEVEC (union type_stack_elt
, stack
->elements
,
1426 /* Ensure that there is a single open slot in the global type stack. */
1429 check_type_stack_depth (void)
1431 type_stack_reserve (&type_stack
, 1);
1434 /* A helper function for insert_type and insert_type_address_space.
1435 This does work of expanding the type stack and inserting the new
1436 element, ELEMENT, into the stack at location SLOT. */
1439 insert_into_type_stack (int slot
, union type_stack_elt element
)
1441 check_type_stack_depth ();
1443 if (slot
< type_stack
.depth
)
1444 memmove (&type_stack
.elements
[slot
+ 1], &type_stack
.elements
[slot
],
1445 (type_stack
.depth
- slot
) * sizeof (union type_stack_elt
));
1446 type_stack
.elements
[slot
] = element
;
1450 /* Insert a new type, TP, at the bottom of the type stack. If TP is
1451 tp_pointer, tp_reference or tp_rvalue_reference, it is inserted at the
1452 bottom. If TP is a qualifier, it is inserted at slot 1 (just above a
1453 previous tp_pointer) if there is anything on the stack, or simply pushed
1454 if the stack is empty. Other values for TP are invalid. */
1457 insert_type (enum type_pieces tp
)
1459 union type_stack_elt element
;
1462 gdb_assert (tp
== tp_pointer
|| tp
== tp_reference
1463 || tp
== tp_rvalue_reference
|| tp
== tp_const
1464 || tp
== tp_volatile
);
1466 /* If there is anything on the stack (we know it will be a
1467 tp_pointer), insert the qualifier above it. Otherwise, simply
1468 push this on the top of the stack. */
1469 if (type_stack
.depth
&& (tp
== tp_const
|| tp
== tp_volatile
))
1475 insert_into_type_stack (slot
, element
);
1479 push_type (enum type_pieces tp
)
1481 check_type_stack_depth ();
1482 type_stack
.elements
[type_stack
.depth
++].piece
= tp
;
1486 push_type_int (int n
)
1488 check_type_stack_depth ();
1489 type_stack
.elements
[type_stack
.depth
++].int_val
= n
;
1492 /* Insert a tp_space_identifier and the corresponding address space
1493 value into the stack. STRING is the name of an address space, as
1494 recognized by address_space_name_to_int. If the stack is empty,
1495 the new elements are simply pushed. If the stack is not empty,
1496 this function assumes that the first item on the stack is a
1497 tp_pointer, and the new values are inserted above the first
1501 insert_type_address_space (struct parser_state
*pstate
, char *string
)
1503 union type_stack_elt element
;
1506 /* If there is anything on the stack (we know it will be a
1507 tp_pointer), insert the address space qualifier above it.
1508 Otherwise, simply push this on the top of the stack. */
1509 if (type_stack
.depth
)
1514 element
.piece
= tp_space_identifier
;
1515 insert_into_type_stack (slot
, element
);
1516 element
.int_val
= address_space_name_to_int (parse_gdbarch (pstate
),
1518 insert_into_type_stack (slot
, element
);
1524 if (type_stack
.depth
)
1525 return type_stack
.elements
[--type_stack
.depth
].piece
;
1532 if (type_stack
.depth
)
1533 return type_stack
.elements
[--type_stack
.depth
].int_val
;
1534 /* "Can't happen". */
1538 /* Pop a type list element from the global type stack. */
1540 static VEC (type_ptr
) *
1543 gdb_assert (type_stack
.depth
);
1544 return type_stack
.elements
[--type_stack
.depth
].typelist_val
;
1547 /* Pop a type_stack element from the global type stack. */
1549 static struct type_stack
*
1550 pop_type_stack (void)
1552 gdb_assert (type_stack
.depth
);
1553 return type_stack
.elements
[--type_stack
.depth
].stack_val
;
1556 /* Append the elements of the type stack FROM to the type stack TO.
1557 Always returns TO. */
1560 append_type_stack (struct type_stack
*to
, struct type_stack
*from
)
1562 type_stack_reserve (to
, from
->depth
);
1564 memcpy (&to
->elements
[to
->depth
], &from
->elements
[0],
1565 from
->depth
* sizeof (union type_stack_elt
));
1566 to
->depth
+= from
->depth
;
1571 /* Push the type stack STACK as an element on the global type stack. */
1574 push_type_stack (struct type_stack
*stack
)
1576 check_type_stack_depth ();
1577 type_stack
.elements
[type_stack
.depth
++].stack_val
= stack
;
1578 push_type (tp_type_stack
);
1581 /* Copy the global type stack into a newly allocated type stack and
1582 return it. The global stack is cleared. The returned type stack
1583 must be freed with type_stack_cleanup. */
1586 get_type_stack (void)
1588 struct type_stack
*result
= XNEW (struct type_stack
);
1590 *result
= type_stack
;
1591 type_stack
.depth
= 0;
1592 type_stack
.size
= 0;
1593 type_stack
.elements
= NULL
;
1598 /* A cleanup function that destroys a single type stack. */
1601 type_stack_cleanup (void *arg
)
1603 struct type_stack
*stack
= (struct type_stack
*) arg
;
1605 xfree (stack
->elements
);
1609 /* Push a function type with arguments onto the global type stack.
1610 LIST holds the argument types. If the final item in LIST is NULL,
1611 then the function will be varargs. */
1614 push_typelist (VEC (type_ptr
) *list
)
1616 check_type_stack_depth ();
1617 type_stack
.elements
[type_stack
.depth
++].typelist_val
= list
;
1618 push_type (tp_function_with_arguments
);
1621 /* Pop the type stack and return a type_instance_flags that
1622 corresponds the const/volatile qualifiers on the stack. This is
1623 called by the C++ parser when parsing methods types, and as such no
1624 other kind of type in the type stack is expected. */
1627 follow_type_instance_flags ()
1629 type_instance_flags flags
= 0;
1632 switch (pop_type ())
1637 flags
|= TYPE_INSTANCE_FLAG_CONST
;
1640 flags
|= TYPE_INSTANCE_FLAG_VOLATILE
;
1643 gdb_assert_not_reached ("unrecognized tp_ value in follow_types");
1648 /* Pop the type stack and return the type which corresponds to FOLLOW_TYPE
1649 as modified by all the stuff on the stack. */
1651 follow_types (struct type
*follow_type
)
1655 int make_volatile
= 0;
1656 int make_addr_space
= 0;
1660 switch (pop_type ())
1665 follow_type
= make_cv_type (make_const
,
1666 TYPE_VOLATILE (follow_type
),
1669 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1672 if (make_addr_space
)
1673 follow_type
= make_type_with_address_space (follow_type
,
1675 make_const
= make_volatile
= 0;
1676 make_addr_space
= 0;
1684 case tp_space_identifier
:
1685 make_addr_space
= pop_type_int ();
1688 follow_type
= lookup_pointer_type (follow_type
);
1690 follow_type
= make_cv_type (make_const
,
1691 TYPE_VOLATILE (follow_type
),
1694 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1697 if (make_addr_space
)
1698 follow_type
= make_type_with_address_space (follow_type
,
1700 make_const
= make_volatile
= 0;
1701 make_addr_space
= 0;
1704 follow_type
= lookup_lvalue_reference_type (follow_type
);
1705 goto process_reference
;
1706 case tp_rvalue_reference
:
1707 follow_type
= lookup_rvalue_reference_type (follow_type
);
1710 follow_type
= make_cv_type (make_const
,
1711 TYPE_VOLATILE (follow_type
),
1714 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1717 if (make_addr_space
)
1718 follow_type
= make_type_with_address_space (follow_type
,
1720 make_const
= make_volatile
= 0;
1721 make_addr_space
= 0;
1724 array_size
= pop_type_int ();
1725 /* FIXME-type-allocation: need a way to free this type when we are
1728 lookup_array_range_type (follow_type
,
1729 0, array_size
>= 0 ? array_size
- 1 : 0);
1731 TYPE_HIGH_BOUND_KIND (TYPE_INDEX_TYPE (follow_type
))
1735 /* FIXME-type-allocation: need a way to free this type when we are
1737 follow_type
= lookup_function_type (follow_type
);
1740 case tp_function_with_arguments
:
1742 VEC (type_ptr
) *args
= pop_typelist ();
1745 = lookup_function_type_with_arguments (follow_type
,
1746 VEC_length (type_ptr
, args
),
1747 VEC_address (type_ptr
,
1749 VEC_free (type_ptr
, args
);
1755 struct type_stack
*stack
= pop_type_stack ();
1756 /* Sort of ugly, but not really much worse than the
1758 struct type_stack save
= type_stack
;
1760 type_stack
= *stack
;
1761 follow_type
= follow_types (follow_type
);
1762 gdb_assert (type_stack
.depth
== 0);
1768 gdb_assert_not_reached ("unrecognized tp_ value in follow_types");
1773 /* This function avoids direct calls to fprintf
1774 in the parser generated debug code. */
1776 parser_fprintf (FILE *x
, const char *y
, ...)
1782 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1785 fprintf_unfiltered (gdb_stderr
, " Unknown FILE used.\n");
1786 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1791 /* Implementation of the exp_descriptor method operator_check. */
1794 operator_check_standard (struct expression
*exp
, int pos
,
1795 int (*objfile_func
) (struct objfile
*objfile
,
1799 const union exp_element
*const elts
= exp
->elts
;
1800 struct type
*type
= NULL
;
1801 struct objfile
*objfile
= NULL
;
1803 /* Extended operators should have been already handled by exp_descriptor
1804 iterate method of its specific language. */
1805 gdb_assert (elts
[pos
].opcode
< OP_EXTENDED0
);
1807 /* Track the callers of write_exp_elt_type for this table. */
1809 switch (elts
[pos
].opcode
)
1822 type
= elts
[pos
+ 1].type
;
1827 LONGEST arg
, nargs
= elts
[pos
+ 2].longconst
;
1829 for (arg
= 0; arg
< nargs
; arg
++)
1831 struct type
*type
= elts
[pos
+ 3 + arg
].type
;
1832 struct objfile
*objfile
= TYPE_OBJFILE (type
);
1834 if (objfile
&& (*objfile_func
) (objfile
, data
))
1842 const struct block
*const block
= elts
[pos
+ 1].block
;
1843 const struct symbol
*const symbol
= elts
[pos
+ 2].symbol
;
1845 /* Check objfile where the variable itself is placed.
1846 SYMBOL_OBJ_SECTION (symbol) may be NULL. */
1847 if ((*objfile_func
) (symbol_objfile (symbol
), data
))
1850 /* Check objfile where is placed the code touching the variable. */
1851 objfile
= lookup_objfile_from_block (block
);
1853 type
= SYMBOL_TYPE (symbol
);
1856 case OP_VAR_MSYM_VALUE
:
1857 objfile
= elts
[pos
+ 1].objfile
;
1861 /* Invoke callbacks for TYPE and OBJFILE if they were set as non-NULL. */
1863 if (type
&& TYPE_OBJFILE (type
)
1864 && (*objfile_func
) (TYPE_OBJFILE (type
), data
))
1866 if (objfile
&& (*objfile_func
) (objfile
, data
))
1872 /* Call OBJFILE_FUNC for any objfile found being referenced by EXP.
1873 OBJFILE_FUNC is never called with NULL OBJFILE. OBJFILE_FUNC get
1874 passed an arbitrary caller supplied DATA pointer. If OBJFILE_FUNC
1875 returns non-zero value then (any other) non-zero value is immediately
1876 returned to the caller. Otherwise zero is returned after iterating
1877 through whole EXP. */
1880 exp_iterate (struct expression
*exp
,
1881 int (*objfile_func
) (struct objfile
*objfile
, void *data
),
1886 for (endpos
= exp
->nelts
; endpos
> 0; )
1888 int pos
, args
, oplen
= 0;
1890 operator_length (exp
, endpos
, &oplen
, &args
);
1891 gdb_assert (oplen
> 0);
1893 pos
= endpos
- oplen
;
1894 if (exp
->language_defn
->la_exp_desc
->operator_check (exp
, pos
,
1895 objfile_func
, data
))
1904 /* Helper for exp_uses_objfile. */
1907 exp_uses_objfile_iter (struct objfile
*exp_objfile
, void *objfile_voidp
)
1909 struct objfile
*objfile
= (struct objfile
*) objfile_voidp
;
1911 if (exp_objfile
->separate_debug_objfile_backlink
)
1912 exp_objfile
= exp_objfile
->separate_debug_objfile_backlink
;
1914 return exp_objfile
== objfile
;
1917 /* Return 1 if EXP uses OBJFILE (and will become dangling when OBJFILE
1918 is unloaded), otherwise return 0. OBJFILE must not be a separate debug info
1922 exp_uses_objfile (struct expression
*exp
, struct objfile
*objfile
)
1924 gdb_assert (objfile
->separate_debug_objfile_backlink
== NULL
);
1926 return exp_iterate (exp
, exp_uses_objfile_iter
, objfile
);
1929 /* See definition in parser-defs.h. */
1932 increase_expout_size (struct parser_state
*ps
, size_t lenelt
)
1934 if ((ps
->expout_ptr
+ lenelt
) >= ps
->expout_size
)
1936 ps
->expout_size
= std::max (ps
->expout_size
* 2,
1937 ps
->expout_ptr
+ lenelt
+ 10);
1938 ps
->expout
= (struct expression
*)
1939 xrealloc (ps
->expout
, (sizeof (struct expression
)
1940 + EXP_ELEM_TO_BYTES (ps
->expout_size
)));
1945 _initialize_parse (void)
1947 type_stack
.size
= 0;
1948 type_stack
.depth
= 0;
1949 type_stack
.elements
= NULL
;
1951 add_setshow_zuinteger_cmd ("expression", class_maintenance
,
1953 _("Set expression debugging."),
1954 _("Show expression debugging."),
1955 _("When non-zero, the internal representation "
1956 "of expressions will be printed."),
1958 show_expressiondebug
,
1959 &setdebuglist
, &showdebuglist
);
1960 add_setshow_boolean_cmd ("parser", class_maintenance
,
1962 _("Set parser debugging."),
1963 _("Show parser debugging."),
1964 _("When non-zero, expression parser "
1965 "tracing will be enabled."),
1968 &setdebuglist
, &showdebuglist
);