1 /* Parse expressions for GDB.
3 Copyright (C) 1986-2018 Free Software Foundation, Inc.
5 Modified from expread.y by the Department of Computer Science at the
6 State University of New York at Buffalo, 1991.
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 /* Parse an expression from text in a string,
24 and return the result as a struct expression pointer.
25 That structure contains arithmetic operations in reverse polish,
26 with constants represented by operations that are followed by special data.
27 See expression.h for the details of the format.
28 What is important here is that it can be built up sequentially
29 during the process of parsing; the lower levels of the tree always
30 come first in the result. */
34 #include "arch-utils.h"
38 #include "expression.h"
43 #include "parser-defs.h"
45 #include "symfile.h" /* for overlay functions */
47 #include "target-float.h"
51 #include "user-regs.h"
53 #include "common/gdb_optional.h"
55 /* Standard set of definitions for printing, dumping, prefixifying,
56 * and evaluating expressions. */
58 const struct exp_descriptor exp_descriptor_standard
=
60 print_subexp_standard
,
61 operator_length_standard
,
62 operator_check_standard
,
64 dump_subexp_body_standard
,
65 evaluate_subexp_standard
68 /* Global variables declared in parser-defs.h (and commented there). */
69 const struct block
*expression_context_block
;
70 CORE_ADDR expression_context_pc
;
71 innermost_block_tracker innermost_block
;
73 static struct type_stack type_stack
;
75 const char *prev_lexptr
;
79 /* True if parsing an expression to attempt completion. */
82 /* The index of the last struct expression directly before a '.' or
83 '->'. This is set when parsing and is only used when completing a
84 field name. It is -1 if no dereference operation was found. */
85 static int expout_last_struct
= -1;
87 /* If we are completing a tagged type name, this will be nonzero. */
88 static enum type_code expout_tag_completion_type
= TYPE_CODE_UNDEF
;
90 /* The token for tagged type name completion. */
91 static gdb::unique_xmalloc_ptr
<char> expout_completion_name
;
94 static unsigned int expressiondebug
= 0;
96 show_expressiondebug (struct ui_file
*file
, int from_tty
,
97 struct cmd_list_element
*c
, const char *value
)
99 fprintf_filtered (file
, _("Expression debugging is %s.\n"), value
);
103 /* Non-zero if an expression parser should set yydebug. */
107 show_parserdebug (struct ui_file
*file
, int from_tty
,
108 struct cmd_list_element
*c
, const char *value
)
110 fprintf_filtered (file
, _("Parser debugging is %s.\n"), value
);
114 static int prefixify_subexp (struct expression
*, struct expression
*, int,
117 static expression_up
parse_exp_in_context (const char **, CORE_ADDR
,
118 const struct block
*, int,
120 static expression_up
parse_exp_in_context_1 (const char **, CORE_ADDR
,
121 const struct block
*, int,
124 /* Documented at it's declaration. */
127 innermost_block_tracker::update (const struct block
*b
,
128 innermost_block_tracker_types t
)
130 if ((m_types
& t
) != 0
131 && (m_innermost_block
== NULL
132 || contained_in (b
, m_innermost_block
)))
133 m_innermost_block
= b
;
136 /* Data structure for saving values of arglist_len for function calls whose
137 arguments contain other function calls. */
139 static std::vector
<int> *funcall_chain
;
141 /* Begin counting arguments for a function call,
142 saving the data about any containing call. */
147 funcall_chain
->push_back (arglist_len
);
151 /* Return the number of arguments in a function call just terminated,
152 and restore the data for the containing function call. */
157 int val
= arglist_len
;
158 arglist_len
= funcall_chain
->back ();
159 funcall_chain
->pop_back ();
165 /* See definition in parser-defs.h. */
167 parser_state::parser_state (size_t initial_size
,
168 const struct language_defn
*lang
,
169 struct gdbarch
*gdbarch
)
170 : expout_size (initial_size
),
171 expout (XNEWVAR (expression
,
173 + EXP_ELEM_TO_BYTES (expout_size
)))),
176 expout
->language_defn
= lang
;
177 expout
->gdbarch
= gdbarch
;
181 parser_state::release ()
183 /* Record the actual number of expression elements, and then
184 reallocate the expression memory so that we free up any
187 expout
->nelts
= expout_ptr
;
188 expout
.reset (XRESIZEVAR (expression
, expout
.release (),
190 + EXP_ELEM_TO_BYTES (expout_ptr
))));
192 return std::move (expout
);
195 /* This page contains the functions for adding data to the struct expression
196 being constructed. */
198 /* Add one element to the end of the expression. */
200 /* To avoid a bug in the Sun 4 compiler, we pass things that can fit into
201 a register through here. */
204 write_exp_elt (struct parser_state
*ps
, const union exp_element
*expelt
)
206 if (ps
->expout_ptr
>= ps
->expout_size
)
208 ps
->expout_size
*= 2;
209 ps
->expout
.reset (XRESIZEVAR (expression
, ps
->expout
.release (),
211 + EXP_ELEM_TO_BYTES (ps
->expout_size
))));
213 ps
->expout
->elts
[ps
->expout_ptr
++] = *expelt
;
217 write_exp_elt_opcode (struct parser_state
*ps
, enum exp_opcode expelt
)
219 union exp_element tmp
;
221 memset (&tmp
, 0, sizeof (union exp_element
));
223 write_exp_elt (ps
, &tmp
);
227 write_exp_elt_sym (struct parser_state
*ps
, struct symbol
*expelt
)
229 union exp_element tmp
;
231 memset (&tmp
, 0, sizeof (union exp_element
));
233 write_exp_elt (ps
, &tmp
);
237 write_exp_elt_msym (struct parser_state
*ps
, minimal_symbol
*expelt
)
239 union exp_element tmp
;
241 memset (&tmp
, 0, sizeof (union exp_element
));
242 tmp
.msymbol
= expelt
;
243 write_exp_elt (ps
, &tmp
);
247 write_exp_elt_block (struct parser_state
*ps
, const struct block
*b
)
249 union exp_element tmp
;
251 memset (&tmp
, 0, sizeof (union exp_element
));
253 write_exp_elt (ps
, &tmp
);
257 write_exp_elt_objfile (struct parser_state
*ps
, struct objfile
*objfile
)
259 union exp_element tmp
;
261 memset (&tmp
, 0, sizeof (union exp_element
));
262 tmp
.objfile
= objfile
;
263 write_exp_elt (ps
, &tmp
);
267 write_exp_elt_longcst (struct parser_state
*ps
, LONGEST expelt
)
269 union exp_element tmp
;
271 memset (&tmp
, 0, sizeof (union exp_element
));
272 tmp
.longconst
= expelt
;
273 write_exp_elt (ps
, &tmp
);
277 write_exp_elt_floatcst (struct parser_state
*ps
, const gdb_byte expelt
[16])
279 union exp_element tmp
;
282 for (index
= 0; index
< 16; index
++)
283 tmp
.floatconst
[index
] = expelt
[index
];
285 write_exp_elt (ps
, &tmp
);
289 write_exp_elt_type (struct parser_state
*ps
, struct type
*expelt
)
291 union exp_element tmp
;
293 memset (&tmp
, 0, sizeof (union exp_element
));
295 write_exp_elt (ps
, &tmp
);
299 write_exp_elt_intern (struct parser_state
*ps
, struct internalvar
*expelt
)
301 union exp_element tmp
;
303 memset (&tmp
, 0, sizeof (union exp_element
));
304 tmp
.internalvar
= expelt
;
305 write_exp_elt (ps
, &tmp
);
308 /* Add a string constant to the end of the expression.
310 String constants are stored by first writing an expression element
311 that contains the length of the string, then stuffing the string
312 constant itself into however many expression elements are needed
313 to hold it, and then writing another expression element that contains
314 the length of the string. I.e. an expression element at each end of
315 the string records the string length, so you can skip over the
316 expression elements containing the actual string bytes from either
317 end of the string. Note that this also allows gdb to handle
318 strings with embedded null bytes, as is required for some languages.
320 Don't be fooled by the fact that the string is null byte terminated,
321 this is strictly for the convenience of debugging gdb itself.
322 Gdb does not depend up the string being null terminated, since the
323 actual length is recorded in expression elements at each end of the
324 string. The null byte is taken into consideration when computing how
325 many expression elements are required to hold the string constant, of
330 write_exp_string (struct parser_state
*ps
, struct stoken str
)
332 int len
= str
.length
;
336 /* Compute the number of expression elements required to hold the string
337 (including a null byte terminator), along with one expression element
338 at each end to record the actual string length (not including the
339 null byte terminator). */
341 lenelt
= 2 + BYTES_TO_EXP_ELEM (len
+ 1);
343 increase_expout_size (ps
, lenelt
);
345 /* Write the leading length expression element (which advances the current
346 expression element index), then write the string constant followed by a
347 terminating null byte, and then write the trailing length expression
350 write_exp_elt_longcst (ps
, (LONGEST
) len
);
351 strdata
= (char *) &ps
->expout
->elts
[ps
->expout_ptr
];
352 memcpy (strdata
, str
.ptr
, len
);
353 *(strdata
+ len
) = '\0';
354 ps
->expout_ptr
+= lenelt
- 2;
355 write_exp_elt_longcst (ps
, (LONGEST
) len
);
358 /* Add a vector of string constants to the end of the expression.
360 This adds an OP_STRING operation, but encodes the contents
361 differently from write_exp_string. The language is expected to
362 handle evaluation of this expression itself.
364 After the usual OP_STRING header, TYPE is written into the
365 expression as a long constant. The interpretation of this field is
366 up to the language evaluator.
368 Next, each string in VEC is written. The length is written as a
369 long constant, followed by the contents of the string. */
372 write_exp_string_vector (struct parser_state
*ps
, int type
,
373 struct stoken_vector
*vec
)
378 /* Compute the size. We compute the size in number of slots to
379 avoid issues with string padding. */
381 for (i
= 0; i
< vec
->len
; ++i
)
383 /* One slot for the length of this element, plus the number of
384 slots needed for this string. */
385 n_slots
+= 1 + BYTES_TO_EXP_ELEM (vec
->tokens
[i
].length
);
388 /* One more slot for the type of the string. */
391 /* Now compute a phony string length. */
392 len
= EXP_ELEM_TO_BYTES (n_slots
) - 1;
395 increase_expout_size (ps
, n_slots
);
397 write_exp_elt_opcode (ps
, OP_STRING
);
398 write_exp_elt_longcst (ps
, len
);
399 write_exp_elt_longcst (ps
, type
);
401 for (i
= 0; i
< vec
->len
; ++i
)
403 write_exp_elt_longcst (ps
, vec
->tokens
[i
].length
);
404 memcpy (&ps
->expout
->elts
[ps
->expout_ptr
], vec
->tokens
[i
].ptr
,
405 vec
->tokens
[i
].length
);
406 ps
->expout_ptr
+= BYTES_TO_EXP_ELEM (vec
->tokens
[i
].length
);
409 write_exp_elt_longcst (ps
, len
);
410 write_exp_elt_opcode (ps
, OP_STRING
);
413 /* Add a bitstring constant to the end of the expression.
415 Bitstring constants are stored by first writing an expression element
416 that contains the length of the bitstring (in bits), then stuffing the
417 bitstring constant itself into however many expression elements are
418 needed to hold it, and then writing another expression element that
419 contains the length of the bitstring. I.e. an expression element at
420 each end of the bitstring records the bitstring length, so you can skip
421 over the expression elements containing the actual bitstring bytes from
422 either end of the bitstring. */
425 write_exp_bitstring (struct parser_state
*ps
, struct stoken str
)
427 int bits
= str
.length
; /* length in bits */
428 int len
= (bits
+ HOST_CHAR_BIT
- 1) / HOST_CHAR_BIT
;
432 /* Compute the number of expression elements required to hold the bitstring,
433 along with one expression element at each end to record the actual
434 bitstring length in bits. */
436 lenelt
= 2 + BYTES_TO_EXP_ELEM (len
);
438 increase_expout_size (ps
, lenelt
);
440 /* Write the leading length expression element (which advances the current
441 expression element index), then write the bitstring constant, and then
442 write the trailing length expression element. */
444 write_exp_elt_longcst (ps
, (LONGEST
) bits
);
445 strdata
= (char *) &ps
->expout
->elts
[ps
->expout_ptr
];
446 memcpy (strdata
, str
.ptr
, len
);
447 ps
->expout_ptr
+= lenelt
- 2;
448 write_exp_elt_longcst (ps
, (LONGEST
) bits
);
451 /* Return the type of MSYMBOL, a minimal symbol of OBJFILE. If
452 ADDRESS_P is not NULL, set it to the MSYMBOL's resolved
456 find_minsym_type_and_address (minimal_symbol
*msymbol
,
457 struct objfile
*objfile
,
458 CORE_ADDR
*address_p
)
460 bound_minimal_symbol bound_msym
= {msymbol
, objfile
};
461 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
462 struct obj_section
*section
= MSYMBOL_OBJ_SECTION (objfile
, msymbol
);
463 enum minimal_symbol_type type
= MSYMBOL_TYPE (msymbol
);
465 bool is_tls
= (section
!= NULL
466 && section
->the_bfd_section
->flags
& SEC_THREAD_LOCAL
);
468 /* The minimal symbol might point to a function descriptor;
469 resolve it to the actual code address instead. */
473 /* Addresses of TLS symbols are really offsets into a
474 per-objfile/per-thread storage block. */
475 addr
= MSYMBOL_VALUE_RAW_ADDRESS (bound_msym
.minsym
);
477 else if (msymbol_is_function (objfile
, msymbol
, &addr
))
479 if (addr
!= BMSYMBOL_VALUE_ADDRESS (bound_msym
))
481 /* This means we resolved a function descriptor, and we now
482 have an address for a code/text symbol instead of a data
484 if (MSYMBOL_TYPE (msymbol
) == mst_data_gnu_ifunc
)
485 type
= mst_text_gnu_ifunc
;
492 addr
= BMSYMBOL_VALUE_ADDRESS (bound_msym
);
494 if (overlay_debugging
)
495 addr
= symbol_overlayed_address (addr
, section
);
499 /* Skip translation if caller does not need the address. */
500 if (address_p
!= NULL
)
501 *address_p
= target_translate_tls_address (objfile
, addr
);
502 return objfile_type (objfile
)->nodebug_tls_symbol
;
505 if (address_p
!= NULL
)
512 case mst_solib_trampoline
:
513 return objfile_type (objfile
)->nodebug_text_symbol
;
515 case mst_text_gnu_ifunc
:
516 return objfile_type (objfile
)->nodebug_text_gnu_ifunc_symbol
;
522 return objfile_type (objfile
)->nodebug_data_symbol
;
524 case mst_slot_got_plt
:
525 return objfile_type (objfile
)->nodebug_got_plt_symbol
;
528 return objfile_type (objfile
)->nodebug_unknown_symbol
;
532 /* Add the appropriate elements for a minimal symbol to the end of
536 write_exp_msymbol (struct parser_state
*ps
,
537 struct bound_minimal_symbol bound_msym
)
539 write_exp_elt_opcode (ps
, OP_VAR_MSYM_VALUE
);
540 write_exp_elt_objfile (ps
, bound_msym
.objfile
);
541 write_exp_elt_msym (ps
, bound_msym
.minsym
);
542 write_exp_elt_opcode (ps
, OP_VAR_MSYM_VALUE
);
545 /* Mark the current index as the starting location of a structure
546 expression. This is used when completing on field names. */
549 mark_struct_expression (struct parser_state
*ps
)
551 gdb_assert (parse_completion
552 && expout_tag_completion_type
== TYPE_CODE_UNDEF
);
553 expout_last_struct
= ps
->expout_ptr
;
556 /* Indicate that the current parser invocation is completing a tag.
557 TAG is the type code of the tag, and PTR and LENGTH represent the
558 start of the tag name. */
561 mark_completion_tag (enum type_code tag
, const char *ptr
, int length
)
563 gdb_assert (parse_completion
564 && expout_tag_completion_type
== TYPE_CODE_UNDEF
565 && expout_completion_name
== NULL
566 && expout_last_struct
== -1);
567 gdb_assert (tag
== TYPE_CODE_UNION
568 || tag
== TYPE_CODE_STRUCT
569 || tag
== TYPE_CODE_ENUM
);
570 expout_tag_completion_type
= tag
;
571 expout_completion_name
.reset (xstrndup (ptr
, length
));
575 /* Recognize tokens that start with '$'. These include:
577 $regname A native register name or a "standard
580 $variable A convenience variable with a name chosen
583 $digits Value history with index <digits>, starting
584 from the first value which has index 1.
586 $$digits Value history with index <digits> relative
587 to the last value. I.e. $$0 is the last
588 value, $$1 is the one previous to that, $$2
589 is the one previous to $$1, etc.
591 $ | $0 | $$0 The last value in the value history.
593 $$ An abbreviation for the second to the last
594 value in the value history, I.e. $$1 */
597 write_dollar_variable (struct parser_state
*ps
, struct stoken str
)
599 struct block_symbol sym
;
600 struct bound_minimal_symbol msym
;
601 struct internalvar
*isym
= NULL
;
603 /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1)
604 and $$digits (equivalent to $<-digits> if you could type that). */
608 /* Double dollar means negate the number and add -1 as well.
609 Thus $$ alone means -1. */
610 if (str
.length
>= 2 && str
.ptr
[1] == '$')
617 /* Just dollars (one or two). */
621 /* Is the rest of the token digits? */
622 for (; i
< str
.length
; i
++)
623 if (!(str
.ptr
[i
] >= '0' && str
.ptr
[i
] <= '9'))
627 i
= atoi (str
.ptr
+ 1 + negate
);
633 /* Handle tokens that refer to machine registers:
634 $ followed by a register name. */
635 i
= user_reg_map_name_to_regnum (parse_gdbarch (ps
),
636 str
.ptr
+ 1, str
.length
- 1);
638 goto handle_register
;
640 /* Any names starting with $ are probably debugger internal variables. */
642 isym
= lookup_only_internalvar (copy_name (str
) + 1);
645 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
646 write_exp_elt_intern (ps
, isym
);
647 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
651 /* On some systems, such as HP-UX and hppa-linux, certain system routines
652 have names beginning with $ or $$. Check for those, first. */
654 sym
= lookup_symbol (copy_name (str
), (struct block
*) NULL
,
658 write_exp_elt_opcode (ps
, OP_VAR_VALUE
);
659 write_exp_elt_block (ps
, sym
.block
);
660 write_exp_elt_sym (ps
, sym
.symbol
);
661 write_exp_elt_opcode (ps
, OP_VAR_VALUE
);
664 msym
= lookup_bound_minimal_symbol (copy_name (str
));
667 write_exp_msymbol (ps
, msym
);
671 /* Any other names are assumed to be debugger internal variables. */
673 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
674 write_exp_elt_intern (ps
, create_internalvar (copy_name (str
) + 1));
675 write_exp_elt_opcode (ps
, OP_INTERNALVAR
);
678 write_exp_elt_opcode (ps
, OP_LAST
);
679 write_exp_elt_longcst (ps
, (LONGEST
) i
);
680 write_exp_elt_opcode (ps
, OP_LAST
);
683 write_exp_elt_opcode (ps
, OP_REGISTER
);
686 write_exp_string (ps
, str
);
687 write_exp_elt_opcode (ps
, OP_REGISTER
);
688 innermost_block
.update (expression_context_block
,
689 INNERMOST_BLOCK_FOR_REGISTERS
);
695 find_template_name_end (const char *p
)
698 int just_seen_right
= 0;
699 int just_seen_colon
= 0;
700 int just_seen_space
= 0;
702 if (!p
|| (*p
!= '<'))
713 /* In future, may want to allow these?? */
716 depth
++; /* start nested template */
717 if (just_seen_colon
|| just_seen_right
|| just_seen_space
)
718 return 0; /* but not after : or :: or > or space */
721 if (just_seen_colon
|| just_seen_right
)
722 return 0; /* end a (nested?) template */
723 just_seen_right
= 1; /* but not after : or :: */
724 if (--depth
== 0) /* also disallow >>, insist on > > */
725 return ++p
; /* if outermost ended, return */
728 if (just_seen_space
|| (just_seen_colon
> 1))
729 return 0; /* nested class spec coming up */
730 just_seen_colon
++; /* we allow :: but not :::: */
735 if (!((*p
>= 'a' && *p
<= 'z') || /* allow token chars */
736 (*p
>= 'A' && *p
<= 'Z') ||
737 (*p
>= '0' && *p
<= '9') ||
738 (*p
== '_') || (*p
== ',') || /* commas for template args */
739 (*p
== '&') || (*p
== '*') || /* pointer and ref types */
740 (*p
== '(') || (*p
== ')') || /* function types */
741 (*p
== '[') || (*p
== ']'))) /* array types */
755 /* Return a null-terminated temporary copy of the name of a string token.
757 Tokens that refer to names do so with explicit pointer and length,
758 so they can share the storage that lexptr is parsing.
759 When it is necessary to pass a name to a function that expects
760 a null-terminated string, the substring is copied out
761 into a separate block of storage.
763 N.B. A single buffer is reused on each call. */
766 copy_name (struct stoken token
)
768 /* A temporary buffer for identifiers, so we can null-terminate them.
769 We allocate this with xrealloc. parse_exp_1 used to allocate with
770 alloca, using the size of the whole expression as a conservative
771 estimate of the space needed. However, macro expansion can
772 introduce names longer than the original expression; there's no
773 practical way to know beforehand how large that might be. */
774 static char *namecopy
;
775 static size_t namecopy_size
;
777 /* Make sure there's enough space for the token. */
778 if (namecopy_size
< token
.length
+ 1)
780 namecopy_size
= token
.length
+ 1;
781 namecopy
= (char *) xrealloc (namecopy
, token
.length
+ 1);
784 memcpy (namecopy
, token
.ptr
, token
.length
);
785 namecopy
[token
.length
] = 0;
791 /* See comments on parser-defs.h. */
794 prefixify_expression (struct expression
*expr
)
796 int len
= sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expr
->nelts
);
797 struct expression
*temp
;
798 int inpos
= expr
->nelts
, outpos
= 0;
800 temp
= (struct expression
*) alloca (len
);
802 /* Copy the original expression into temp. */
803 memcpy (temp
, expr
, len
);
805 return prefixify_subexp (temp
, expr
, inpos
, outpos
);
808 /* Return the number of exp_elements in the postfix subexpression
809 of EXPR whose operator is at index ENDPOS - 1 in EXPR. */
812 length_of_subexp (struct expression
*expr
, int endpos
)
816 operator_length (expr
, endpos
, &oplen
, &args
);
820 oplen
+= length_of_subexp (expr
, endpos
- oplen
);
827 /* Sets *OPLENP to the length of the operator whose (last) index is
828 ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that
832 operator_length (const struct expression
*expr
, int endpos
, int *oplenp
,
835 expr
->language_defn
->la_exp_desc
->operator_length (expr
, endpos
,
839 /* Default value for operator_length in exp_descriptor vectors. */
842 operator_length_standard (const struct expression
*expr
, int endpos
,
843 int *oplenp
, int *argsp
)
847 enum range_type range_type
;
851 error (_("?error in operator_length_standard"));
853 i
= (int) expr
->elts
[endpos
- 1].opcode
;
859 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
860 oplen
= 5 + BYTES_TO_EXP_ELEM (oplen
+ 1);
866 case OP_VAR_MSYM_VALUE
:
870 case OP_FUNC_STATIC_VAR
:
871 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
872 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
880 case OP_VAR_ENTRY_VALUE
:
890 case OP_F77_UNDETERMINED_ARGLIST
:
892 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
896 oplen
= 5 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
900 case OP_OBJC_MSGCALL
: /* Objective C message (method) call. */
902 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
911 case UNOP_DYNAMIC_CAST
:
912 case UNOP_REINTERPRET_CAST
:
913 case UNOP_MEMVAL_TYPE
:
941 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
942 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
947 case STRUCTOP_STRUCT
:
954 case OP_OBJC_NSSTRING
: /* Objective C Foundation Class
955 NSString constant. */
956 case OP_OBJC_SELECTOR
: /* Objective C "@selector" pseudo-op. */
958 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
959 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
964 args
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
965 args
-= longest_to_int (expr
->elts
[endpos
- 3].longconst
);
975 case MULTI_SUBSCRIPT
:
977 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
980 case BINOP_ASSIGN_MODIFY
:
992 range_type
= (enum range_type
)
993 longest_to_int (expr
->elts
[endpos
- 2].longconst
);
997 case LOW_BOUND_DEFAULT
:
998 case HIGH_BOUND_DEFAULT
:
1001 case BOTH_BOUND_DEFAULT
:
1004 case NONE_BOUND_DEFAULT
:
1012 args
= 1 + (i
< (int) BINOP_END
);
1019 /* Copy the subexpression ending just before index INEND in INEXPR
1020 into OUTEXPR, starting at index OUTBEG.
1021 In the process, convert it from suffix to prefix form.
1022 If EXPOUT_LAST_STRUCT is -1, then this function always returns -1.
1023 Otherwise, it returns the index of the subexpression which is the
1024 left-hand-side of the expression at EXPOUT_LAST_STRUCT. */
1027 prefixify_subexp (struct expression
*inexpr
,
1028 struct expression
*outexpr
, int inend
, int outbeg
)
1036 operator_length (inexpr
, inend
, &oplen
, &args
);
1038 /* Copy the final operator itself, from the end of the input
1039 to the beginning of the output. */
1041 memcpy (&outexpr
->elts
[outbeg
], &inexpr
->elts
[inend
],
1042 EXP_ELEM_TO_BYTES (oplen
));
1045 if (expout_last_struct
== inend
)
1046 result
= outbeg
- oplen
;
1048 /* Find the lengths of the arg subexpressions. */
1049 arglens
= (int *) alloca (args
* sizeof (int));
1050 for (i
= args
- 1; i
>= 0; i
--)
1052 oplen
= length_of_subexp (inexpr
, inend
);
1057 /* Now copy each subexpression, preserving the order of
1058 the subexpressions, but prefixifying each one.
1059 In this loop, inend starts at the beginning of
1060 the expression this level is working on
1061 and marches forward over the arguments.
1062 outbeg does similarly in the output. */
1063 for (i
= 0; i
< args
; i
++)
1069 r
= prefixify_subexp (inexpr
, outexpr
, inend
, outbeg
);
1072 /* Return immediately. We probably have only parsed a
1073 partial expression, so we don't want to try to reverse
1074 the other operands. */
1083 /* Read an expression from the string *STRINGPTR points to,
1084 parse it, and return a pointer to a struct expression that we malloc.
1085 Use block BLOCK as the lexical context for variable names;
1086 if BLOCK is zero, use the block of the selected stack frame.
1087 Meanwhile, advance *STRINGPTR to point after the expression,
1088 at the first nonwhite character that is not part of the expression
1089 (possibly a null character).
1091 If COMMA is nonzero, stop if a comma is reached. */
1094 parse_exp_1 (const char **stringptr
, CORE_ADDR pc
, const struct block
*block
,
1097 return parse_exp_in_context (stringptr
, pc
, block
, comma
, 0, NULL
);
1100 static expression_up
1101 parse_exp_in_context (const char **stringptr
, CORE_ADDR pc
,
1102 const struct block
*block
,
1103 int comma
, int void_context_p
, int *out_subexp
)
1105 return parse_exp_in_context_1 (stringptr
, pc
, block
, comma
,
1106 void_context_p
, out_subexp
);
1109 /* As for parse_exp_1, except that if VOID_CONTEXT_P, then
1110 no value is expected from the expression.
1111 OUT_SUBEXP is set when attempting to complete a field name; in this
1112 case it is set to the index of the subexpression on the
1113 left-hand-side of the struct op. If not doing such completion, it
1114 is left untouched. */
1116 static expression_up
1117 parse_exp_in_context_1 (const char **stringptr
, CORE_ADDR pc
,
1118 const struct block
*block
,
1119 int comma
, int void_context_p
, int *out_subexp
)
1121 const struct language_defn
*lang
= NULL
;
1124 lexptr
= *stringptr
;
1128 type_stack
.depth
= 0;
1129 expout_last_struct
= -1;
1130 expout_tag_completion_type
= TYPE_CODE_UNDEF
;
1131 expout_completion_name
.reset ();
1133 comma_terminates
= comma
;
1135 if (lexptr
== 0 || *lexptr
== 0)
1136 error_no_arg (_("expression to compute"));
1138 std::vector
<int> funcalls
;
1139 scoped_restore save_funcall_chain
= make_scoped_restore (&funcall_chain
,
1142 expression_context_block
= block
;
1144 /* If no context specified, try using the current frame, if any. */
1145 if (!expression_context_block
)
1146 expression_context_block
= get_selected_block (&expression_context_pc
);
1148 expression_context_pc
= BLOCK_START (expression_context_block
);
1150 expression_context_pc
= pc
;
1152 /* Fall back to using the current source static context, if any. */
1154 if (!expression_context_block
)
1156 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
1158 expression_context_block
1159 = BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (cursal
.symtab
),
1161 if (expression_context_block
)
1162 expression_context_pc
= BLOCK_START (expression_context_block
);
1165 if (language_mode
== language_mode_auto
&& block
!= NULL
)
1167 /* Find the language associated to the given context block.
1168 Default to the current language if it can not be determined.
1170 Note that using the language corresponding to the current frame
1171 can sometimes give unexpected results. For instance, this
1172 routine is often called several times during the inferior
1173 startup phase to re-parse breakpoint expressions after
1174 a new shared library has been loaded. The language associated
1175 to the current frame at this moment is not relevant for
1176 the breakpoint. Using it would therefore be silly, so it seems
1177 better to rely on the current language rather than relying on
1178 the current frame language to parse the expression. That's why
1179 we do the following language detection only if the context block
1180 has been specifically provided. */
1181 struct symbol
*func
= block_linkage_function (block
);
1184 lang
= language_def (SYMBOL_LANGUAGE (func
));
1185 if (lang
== NULL
|| lang
->la_language
== language_unknown
)
1186 lang
= current_language
;
1189 lang
= current_language
;
1191 /* get_current_arch may reset CURRENT_LANGUAGE via select_frame.
1192 While we need CURRENT_LANGUAGE to be set to LANG (for lookup_symbol
1193 and others called from *.y) ensure CURRENT_LANGUAGE gets restored
1194 to the value matching SELECTED_FRAME as set by get_current_arch. */
1196 parser_state
ps (10, lang
, get_current_arch ());
1198 scoped_restore_current_language lang_saver
;
1199 set_language (lang
->la_language
);
1203 if (lang
->la_parser (&ps
))
1204 lang
->la_error (NULL
);
1206 CATCH (except
, RETURN_MASK_ALL
)
1208 if (! parse_completion
)
1209 throw_exception (except
);
1213 /* We have to operate on an "expression *", due to la_post_parser,
1214 which explains this funny-looking double release. */
1215 expression_up result
= ps
.release ();
1217 /* Convert expression from postfix form as generated by yacc
1218 parser, to a prefix form. */
1220 if (expressiondebug
)
1221 dump_raw_expression (result
.get (), gdb_stdlog
,
1222 "before conversion to prefix form");
1224 subexp
= prefixify_expression (result
.get ());
1226 *out_subexp
= subexp
;
1228 lang
->la_post_parser (&result
, void_context_p
);
1230 if (expressiondebug
)
1231 dump_prefix_expression (result
.get (), gdb_stdlog
);
1233 *stringptr
= lexptr
;
1237 /* Parse STRING as an expression, and complain if this fails
1238 to use up all of the contents of STRING. */
1241 parse_expression (const char *string
)
1243 expression_up exp
= parse_exp_1 (&string
, 0, 0, 0);
1245 error (_("Junk after end of expression."));
1249 /* Same as parse_expression, but using the given language (LANG)
1250 to parse the expression. */
1253 parse_expression_with_language (const char *string
, enum language lang
)
1255 gdb::optional
<scoped_restore_current_language
> lang_saver
;
1256 if (current_language
->la_language
!= lang
)
1258 lang_saver
.emplace ();
1259 set_language (lang
);
1262 return parse_expression (string
);
1265 /* Parse STRING as an expression. If parsing ends in the middle of a
1266 field reference, return the type of the left-hand-side of the
1267 reference; furthermore, if the parsing ends in the field name,
1268 return the field name in *NAME. If the parsing ends in the middle
1269 of a field reference, but the reference is somehow invalid, throw
1270 an exception. In all other cases, return NULL. */
1273 parse_expression_for_completion (const char *string
,
1274 gdb::unique_xmalloc_ptr
<char> *name
,
1275 enum type_code
*code
)
1283 parse_completion
= 1;
1284 exp
= parse_exp_in_context (&string
, 0, 0, 0, 0, &subexp
);
1286 CATCH (except
, RETURN_MASK_ERROR
)
1288 /* Nothing, EXP remains NULL. */
1292 parse_completion
= 0;
1296 if (expout_tag_completion_type
!= TYPE_CODE_UNDEF
)
1298 *code
= expout_tag_completion_type
;
1299 *name
= std::move (expout_completion_name
);
1303 if (expout_last_struct
== -1)
1306 const char *fieldname
= extract_field_op (exp
.get (), &subexp
);
1307 if (fieldname
== NULL
)
1313 name
->reset (xstrdup (fieldname
));
1314 /* This might throw an exception. If so, we want to let it
1316 val
= evaluate_subexpression_type (exp
.get (), subexp
);
1318 return value_type (val
);
1321 /* A post-parser that does nothing. */
1324 null_post_parser (expression_up
*exp
, int void_context_p
)
1328 /* Parse floating point value P of length LEN.
1329 Return false if invalid, true if valid.
1330 The successfully parsed number is stored in DATA in
1331 target format for floating-point type TYPE.
1333 NOTE: This accepts the floating point syntax that sscanf accepts. */
1336 parse_float (const char *p
, int len
,
1337 const struct type
*type
, gdb_byte
*data
)
1339 return target_float_from_string (data
, type
, std::string (p
, len
));
1342 /* Stuff for maintaining a stack of types. Currently just used by C, but
1343 probably useful for any language which declares its types "backwards". */
1345 /* Ensure that there are HOWMUCH open slots on the type stack STACK. */
1348 type_stack_reserve (struct type_stack
*stack
, int howmuch
)
1350 if (stack
->depth
+ howmuch
>= stack
->size
)
1353 if (stack
->size
< howmuch
)
1354 stack
->size
= howmuch
;
1355 stack
->elements
= XRESIZEVEC (union type_stack_elt
, stack
->elements
,
1360 /* Ensure that there is a single open slot in the global type stack. */
1363 check_type_stack_depth (void)
1365 type_stack_reserve (&type_stack
, 1);
1368 /* A helper function for insert_type and insert_type_address_space.
1369 This does work of expanding the type stack and inserting the new
1370 element, ELEMENT, into the stack at location SLOT. */
1373 insert_into_type_stack (int slot
, union type_stack_elt element
)
1375 check_type_stack_depth ();
1377 if (slot
< type_stack
.depth
)
1378 memmove (&type_stack
.elements
[slot
+ 1], &type_stack
.elements
[slot
],
1379 (type_stack
.depth
- slot
) * sizeof (union type_stack_elt
));
1380 type_stack
.elements
[slot
] = element
;
1384 /* Insert a new type, TP, at the bottom of the type stack. If TP is
1385 tp_pointer, tp_reference or tp_rvalue_reference, it is inserted at the
1386 bottom. If TP is a qualifier, it is inserted at slot 1 (just above a
1387 previous tp_pointer) if there is anything on the stack, or simply pushed
1388 if the stack is empty. Other values for TP are invalid. */
1391 insert_type (enum type_pieces tp
)
1393 union type_stack_elt element
;
1396 gdb_assert (tp
== tp_pointer
|| tp
== tp_reference
1397 || tp
== tp_rvalue_reference
|| tp
== tp_const
1398 || tp
== tp_volatile
);
1400 /* If there is anything on the stack (we know it will be a
1401 tp_pointer), insert the qualifier above it. Otherwise, simply
1402 push this on the top of the stack. */
1403 if (type_stack
.depth
&& (tp
== tp_const
|| tp
== tp_volatile
))
1409 insert_into_type_stack (slot
, element
);
1413 push_type (enum type_pieces tp
)
1415 check_type_stack_depth ();
1416 type_stack
.elements
[type_stack
.depth
++].piece
= tp
;
1420 push_type_int (int n
)
1422 check_type_stack_depth ();
1423 type_stack
.elements
[type_stack
.depth
++].int_val
= n
;
1426 /* Insert a tp_space_identifier and the corresponding address space
1427 value into the stack. STRING is the name of an address space, as
1428 recognized by address_space_name_to_int. If the stack is empty,
1429 the new elements are simply pushed. If the stack is not empty,
1430 this function assumes that the first item on the stack is a
1431 tp_pointer, and the new values are inserted above the first
1435 insert_type_address_space (struct parser_state
*pstate
, char *string
)
1437 union type_stack_elt element
;
1440 /* If there is anything on the stack (we know it will be a
1441 tp_pointer), insert the address space qualifier above it.
1442 Otherwise, simply push this on the top of the stack. */
1443 if (type_stack
.depth
)
1448 element
.piece
= tp_space_identifier
;
1449 insert_into_type_stack (slot
, element
);
1450 element
.int_val
= address_space_name_to_int (parse_gdbarch (pstate
),
1452 insert_into_type_stack (slot
, element
);
1458 if (type_stack
.depth
)
1459 return type_stack
.elements
[--type_stack
.depth
].piece
;
1466 if (type_stack
.depth
)
1467 return type_stack
.elements
[--type_stack
.depth
].int_val
;
1468 /* "Can't happen". */
1472 /* Pop a type list element from the global type stack. */
1474 static VEC (type_ptr
) *
1477 gdb_assert (type_stack
.depth
);
1478 return type_stack
.elements
[--type_stack
.depth
].typelist_val
;
1481 /* Pop a type_stack element from the global type stack. */
1483 static struct type_stack
*
1484 pop_type_stack (void)
1486 gdb_assert (type_stack
.depth
);
1487 return type_stack
.elements
[--type_stack
.depth
].stack_val
;
1490 /* Append the elements of the type stack FROM to the type stack TO.
1491 Always returns TO. */
1494 append_type_stack (struct type_stack
*to
, struct type_stack
*from
)
1496 type_stack_reserve (to
, from
->depth
);
1498 memcpy (&to
->elements
[to
->depth
], &from
->elements
[0],
1499 from
->depth
* sizeof (union type_stack_elt
));
1500 to
->depth
+= from
->depth
;
1505 /* Push the type stack STACK as an element on the global type stack. */
1508 push_type_stack (struct type_stack
*stack
)
1510 check_type_stack_depth ();
1511 type_stack
.elements
[type_stack
.depth
++].stack_val
= stack
;
1512 push_type (tp_type_stack
);
1515 /* Copy the global type stack into a newly allocated type stack and
1516 return it. The global stack is cleared. The returned type stack
1517 must be freed with type_stack_cleanup. */
1520 get_type_stack (void)
1522 struct type_stack
*result
= XNEW (struct type_stack
);
1524 *result
= type_stack
;
1525 type_stack
.depth
= 0;
1526 type_stack
.size
= 0;
1527 type_stack
.elements
= NULL
;
1532 /* A cleanup function that destroys a single type stack. */
1535 type_stack_cleanup (void *arg
)
1537 struct type_stack
*stack
= (struct type_stack
*) arg
;
1539 xfree (stack
->elements
);
1543 /* Push a function type with arguments onto the global type stack.
1544 LIST holds the argument types. If the final item in LIST is NULL,
1545 then the function will be varargs. */
1548 push_typelist (VEC (type_ptr
) *list
)
1550 check_type_stack_depth ();
1551 type_stack
.elements
[type_stack
.depth
++].typelist_val
= list
;
1552 push_type (tp_function_with_arguments
);
1555 /* Pop the type stack and return a type_instance_flags that
1556 corresponds the const/volatile qualifiers on the stack. This is
1557 called by the C++ parser when parsing methods types, and as such no
1558 other kind of type in the type stack is expected. */
1561 follow_type_instance_flags ()
1563 type_instance_flags flags
= 0;
1566 switch (pop_type ())
1571 flags
|= TYPE_INSTANCE_FLAG_CONST
;
1574 flags
|= TYPE_INSTANCE_FLAG_VOLATILE
;
1577 gdb_assert_not_reached ("unrecognized tp_ value in follow_types");
1582 /* Pop the type stack and return the type which corresponds to FOLLOW_TYPE
1583 as modified by all the stuff on the stack. */
1585 follow_types (struct type
*follow_type
)
1589 int make_volatile
= 0;
1590 int make_addr_space
= 0;
1594 switch (pop_type ())
1599 follow_type
= make_cv_type (make_const
,
1600 TYPE_VOLATILE (follow_type
),
1603 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1606 if (make_addr_space
)
1607 follow_type
= make_type_with_address_space (follow_type
,
1609 make_const
= make_volatile
= 0;
1610 make_addr_space
= 0;
1618 case tp_space_identifier
:
1619 make_addr_space
= pop_type_int ();
1622 follow_type
= lookup_pointer_type (follow_type
);
1624 follow_type
= make_cv_type (make_const
,
1625 TYPE_VOLATILE (follow_type
),
1628 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1631 if (make_addr_space
)
1632 follow_type
= make_type_with_address_space (follow_type
,
1634 make_const
= make_volatile
= 0;
1635 make_addr_space
= 0;
1638 follow_type
= lookup_lvalue_reference_type (follow_type
);
1639 goto process_reference
;
1640 case tp_rvalue_reference
:
1641 follow_type
= lookup_rvalue_reference_type (follow_type
);
1644 follow_type
= make_cv_type (make_const
,
1645 TYPE_VOLATILE (follow_type
),
1648 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1651 if (make_addr_space
)
1652 follow_type
= make_type_with_address_space (follow_type
,
1654 make_const
= make_volatile
= 0;
1655 make_addr_space
= 0;
1658 array_size
= pop_type_int ();
1659 /* FIXME-type-allocation: need a way to free this type when we are
1662 lookup_array_range_type (follow_type
,
1663 0, array_size
>= 0 ? array_size
- 1 : 0);
1665 TYPE_HIGH_BOUND_KIND (TYPE_INDEX_TYPE (follow_type
))
1669 /* FIXME-type-allocation: need a way to free this type when we are
1671 follow_type
= lookup_function_type (follow_type
);
1674 case tp_function_with_arguments
:
1676 VEC (type_ptr
) *args
= pop_typelist ();
1679 = lookup_function_type_with_arguments (follow_type
,
1680 VEC_length (type_ptr
, args
),
1681 VEC_address (type_ptr
,
1683 VEC_free (type_ptr
, args
);
1689 struct type_stack
*stack
= pop_type_stack ();
1690 /* Sort of ugly, but not really much worse than the
1692 struct type_stack save
= type_stack
;
1694 type_stack
= *stack
;
1695 follow_type
= follow_types (follow_type
);
1696 gdb_assert (type_stack
.depth
== 0);
1702 gdb_assert_not_reached ("unrecognized tp_ value in follow_types");
1707 /* This function avoids direct calls to fprintf
1708 in the parser generated debug code. */
1710 parser_fprintf (FILE *x
, const char *y
, ...)
1716 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1719 fprintf_unfiltered (gdb_stderr
, " Unknown FILE used.\n");
1720 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1725 /* Implementation of the exp_descriptor method operator_check. */
1728 operator_check_standard (struct expression
*exp
, int pos
,
1729 int (*objfile_func
) (struct objfile
*objfile
,
1733 const union exp_element
*const elts
= exp
->elts
;
1734 struct type
*type
= NULL
;
1735 struct objfile
*objfile
= NULL
;
1737 /* Extended operators should have been already handled by exp_descriptor
1738 iterate method of its specific language. */
1739 gdb_assert (elts
[pos
].opcode
< OP_EXTENDED0
);
1741 /* Track the callers of write_exp_elt_type for this table. */
1743 switch (elts
[pos
].opcode
)
1755 type
= elts
[pos
+ 1].type
;
1760 LONGEST arg
, nargs
= elts
[pos
+ 2].longconst
;
1762 for (arg
= 0; arg
< nargs
; arg
++)
1764 struct type
*type
= elts
[pos
+ 3 + arg
].type
;
1765 struct objfile
*objfile
= TYPE_OBJFILE (type
);
1767 if (objfile
&& (*objfile_func
) (objfile
, data
))
1775 const struct block
*const block
= elts
[pos
+ 1].block
;
1776 const struct symbol
*const symbol
= elts
[pos
+ 2].symbol
;
1778 /* Check objfile where the variable itself is placed.
1779 SYMBOL_OBJ_SECTION (symbol) may be NULL. */
1780 if ((*objfile_func
) (symbol_objfile (symbol
), data
))
1783 /* Check objfile where is placed the code touching the variable. */
1784 objfile
= lookup_objfile_from_block (block
);
1786 type
= SYMBOL_TYPE (symbol
);
1789 case OP_VAR_MSYM_VALUE
:
1790 objfile
= elts
[pos
+ 1].objfile
;
1794 /* Invoke callbacks for TYPE and OBJFILE if they were set as non-NULL. */
1796 if (type
&& TYPE_OBJFILE (type
)
1797 && (*objfile_func
) (TYPE_OBJFILE (type
), data
))
1799 if (objfile
&& (*objfile_func
) (objfile
, data
))
1805 /* Call OBJFILE_FUNC for any objfile found being referenced by EXP.
1806 OBJFILE_FUNC is never called with NULL OBJFILE. OBJFILE_FUNC get
1807 passed an arbitrary caller supplied DATA pointer. If OBJFILE_FUNC
1808 returns non-zero value then (any other) non-zero value is immediately
1809 returned to the caller. Otherwise zero is returned after iterating
1810 through whole EXP. */
1813 exp_iterate (struct expression
*exp
,
1814 int (*objfile_func
) (struct objfile
*objfile
, void *data
),
1819 for (endpos
= exp
->nelts
; endpos
> 0; )
1821 int pos
, args
, oplen
= 0;
1823 operator_length (exp
, endpos
, &oplen
, &args
);
1824 gdb_assert (oplen
> 0);
1826 pos
= endpos
- oplen
;
1827 if (exp
->language_defn
->la_exp_desc
->operator_check (exp
, pos
,
1828 objfile_func
, data
))
1837 /* Helper for exp_uses_objfile. */
1840 exp_uses_objfile_iter (struct objfile
*exp_objfile
, void *objfile_voidp
)
1842 struct objfile
*objfile
= (struct objfile
*) objfile_voidp
;
1844 if (exp_objfile
->separate_debug_objfile_backlink
)
1845 exp_objfile
= exp_objfile
->separate_debug_objfile_backlink
;
1847 return exp_objfile
== objfile
;
1850 /* Return 1 if EXP uses OBJFILE (and will become dangling when OBJFILE
1851 is unloaded), otherwise return 0. OBJFILE must not be a separate debug info
1855 exp_uses_objfile (struct expression
*exp
, struct objfile
*objfile
)
1857 gdb_assert (objfile
->separate_debug_objfile_backlink
== NULL
);
1859 return exp_iterate (exp
, exp_uses_objfile_iter
, objfile
);
1862 /* See definition in parser-defs.h. */
1865 increase_expout_size (struct parser_state
*ps
, size_t lenelt
)
1867 if ((ps
->expout_ptr
+ lenelt
) >= ps
->expout_size
)
1869 ps
->expout_size
= std::max (ps
->expout_size
* 2,
1870 ps
->expout_ptr
+ lenelt
+ 10);
1871 ps
->expout
.reset (XRESIZEVAR (expression
,
1872 ps
->expout
.release (),
1873 (sizeof (struct expression
)
1874 + EXP_ELEM_TO_BYTES (ps
->expout_size
))));
1879 _initialize_parse (void)
1881 type_stack
.size
= 0;
1882 type_stack
.depth
= 0;
1883 type_stack
.elements
= NULL
;
1885 add_setshow_zuinteger_cmd ("expression", class_maintenance
,
1887 _("Set expression debugging."),
1888 _("Show expression debugging."),
1889 _("When non-zero, the internal representation "
1890 "of expressions will be printed."),
1892 show_expressiondebug
,
1893 &setdebuglist
, &showdebuglist
);
1894 add_setshow_boolean_cmd ("parser", class_maintenance
,
1896 _("Set parser debugging."),
1897 _("Show parser debugging."),
1898 _("When non-zero, expression parser "
1899 "tracing will be enabled."),
1902 &setdebuglist
, &showdebuglist
);