1 /* Parse expressions for GDB.
3 Copyright (C) 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
4 1998, 1999, 2000, 2001, 2004, 2005, 2007 Free Software Foundation, Inc.
6 Modified from expread.y by the Department of Computer Science at the
7 State University of New York at Buffalo, 1991.
9 This file is part of GDB.
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 /* Parse an expression from text in a string,
25 and return the result as a struct expression pointer.
26 That structure contains arithmetic operations in reverse polish,
27 with constants represented by operations that are followed by special data.
28 See expression.h for the details of the format.
29 What is important here is that it can be built up sequentially
30 during the process of parsing; the lower levels of the tree always
31 come first in the result. */
36 #include "gdb_string.h"
40 #include "expression.h"
45 #include "parser-defs.h"
47 #include "symfile.h" /* for overlay functions */
50 #include "gdb_assert.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
,
63 dump_subexp_body_standard
,
64 evaluate_subexp_standard
67 /* Global variables declared in parser-defs.h (and commented there). */
68 struct expression
*expout
;
71 struct block
*expression_context_block
;
72 CORE_ADDR expression_context_pc
;
73 struct block
*innermost_block
;
75 union type_stack_elt
*type_stack
;
76 int type_stack_depth
, type_stack_size
;
82 /* A temporary buffer for identifiers, so we can null-terminate them.
84 We allocate this with xrealloc. parse_exp_1 used to allocate with
85 alloca, using the size of the whole expression as a conservative
86 estimate of the space needed. However, macro expansion can
87 introduce names longer than the original expression; there's no
88 practical way to know beforehand how large that might be. */
92 static int expressiondebug
= 0;
94 show_expressiondebug (struct ui_file
*file
, int from_tty
,
95 struct cmd_list_element
*c
, const char *value
)
97 fprintf_filtered (file
, _("Expression debugging is %s.\n"), value
);
100 static void free_funcalls (void *ignore
);
102 static void prefixify_expression (struct expression
*);
104 static void prefixify_subexp (struct expression
*, struct expression
*, int,
107 static struct expression
*parse_exp_in_context (char **, struct block
*, int,
110 void _initialize_parse (void);
112 /* Data structure for saving values of arglist_len for function calls whose
113 arguments contain other function calls. */
117 struct funcall
*next
;
121 static struct funcall
*funcall_chain
;
123 /* Begin counting arguments for a function call,
124 saving the data about any containing call. */
131 new = (struct funcall
*) xmalloc (sizeof (struct funcall
));
132 new->next
= funcall_chain
;
133 new->arglist_len
= arglist_len
;
138 /* Return the number of arguments in a function call just terminated,
139 and restore the data for the containing function call. */
144 int val
= arglist_len
;
145 struct funcall
*call
= funcall_chain
;
146 funcall_chain
= call
->next
;
147 arglist_len
= call
->arglist_len
;
152 /* Free everything in the funcall chain.
153 Used when there is an error inside parsing. */
156 free_funcalls (void *ignore
)
158 struct funcall
*call
, *next
;
160 for (call
= funcall_chain
; call
; call
= next
)
167 /* This page contains the functions for adding data to the struct expression
168 being constructed. */
170 /* Add one element to the end of the expression. */
172 /* To avoid a bug in the Sun 4 compiler, we pass things that can fit into
173 a register through here */
176 write_exp_elt (union exp_element expelt
)
178 if (expout_ptr
>= expout_size
)
181 expout
= (struct expression
*)
182 xrealloc ((char *) expout
, sizeof (struct expression
)
183 + EXP_ELEM_TO_BYTES (expout_size
));
185 expout
->elts
[expout_ptr
++] = expelt
;
189 write_exp_elt_opcode (enum exp_opcode expelt
)
191 union exp_element tmp
;
192 memset (&tmp
, 0, sizeof (union exp_element
));
200 write_exp_elt_sym (struct symbol
*expelt
)
202 union exp_element tmp
;
203 memset (&tmp
, 0, sizeof (union exp_element
));
211 write_exp_elt_block (struct block
*b
)
213 union exp_element tmp
;
214 memset (&tmp
, 0, sizeof (union exp_element
));
220 write_exp_elt_objfile (struct objfile
*objfile
)
222 union exp_element tmp
;
223 memset (&tmp
, 0, sizeof (union exp_element
));
224 tmp
.objfile
= objfile
;
229 write_exp_elt_longcst (LONGEST expelt
)
231 union exp_element tmp
;
232 memset (&tmp
, 0, sizeof (union exp_element
));
234 tmp
.longconst
= expelt
;
240 write_exp_elt_dblcst (DOUBLEST expelt
)
242 union exp_element tmp
;
243 memset (&tmp
, 0, sizeof (union exp_element
));
245 tmp
.doubleconst
= expelt
;
251 write_exp_elt_decfloatcst (gdb_byte expelt
[16])
253 union exp_element tmp
;
256 for (index
= 0; index
< 16; index
++)
257 tmp
.decfloatconst
[index
] = expelt
[index
];
263 write_exp_elt_type (struct type
*expelt
)
265 union exp_element tmp
;
266 memset (&tmp
, 0, sizeof (union exp_element
));
274 write_exp_elt_intern (struct internalvar
*expelt
)
276 union exp_element tmp
;
277 memset (&tmp
, 0, sizeof (union exp_element
));
279 tmp
.internalvar
= expelt
;
284 /* Add a string constant to the end of the expression.
286 String constants are stored by first writing an expression element
287 that contains the length of the string, then stuffing the string
288 constant itself into however many expression elements are needed
289 to hold it, and then writing another expression element that contains
290 the length of the string. I.E. an expression element at each end of
291 the string records the string length, so you can skip over the
292 expression elements containing the actual string bytes from either
293 end of the string. Note that this also allows gdb to handle
294 strings with embedded null bytes, as is required for some languages.
296 Don't be fooled by the fact that the string is null byte terminated,
297 this is strictly for the convenience of debugging gdb itself. Gdb
298 Gdb does not depend up the string being null terminated, since the
299 actual length is recorded in expression elements at each end of the
300 string. The null byte is taken into consideration when computing how
301 many expression elements are required to hold the string constant, of
306 write_exp_string (struct stoken str
)
308 int len
= str
.length
;
312 /* Compute the number of expression elements required to hold the string
313 (including a null byte terminator), along with one expression element
314 at each end to record the actual string length (not including the
315 null byte terminator). */
317 lenelt
= 2 + BYTES_TO_EXP_ELEM (len
+ 1);
319 /* Ensure that we have enough available expression elements to store
322 if ((expout_ptr
+ lenelt
) >= expout_size
)
324 expout_size
= max (expout_size
* 2, expout_ptr
+ lenelt
+ 10);
325 expout
= (struct expression
*)
326 xrealloc ((char *) expout
, (sizeof (struct expression
)
327 + EXP_ELEM_TO_BYTES (expout_size
)));
330 /* Write the leading length expression element (which advances the current
331 expression element index), then write the string constant followed by a
332 terminating null byte, and then write the trailing length expression
335 write_exp_elt_longcst ((LONGEST
) len
);
336 strdata
= (char *) &expout
->elts
[expout_ptr
];
337 memcpy (strdata
, str
.ptr
, len
);
338 *(strdata
+ len
) = '\0';
339 expout_ptr
+= lenelt
- 2;
340 write_exp_elt_longcst ((LONGEST
) len
);
343 /* Add a bitstring constant to the end of the expression.
345 Bitstring constants are stored by first writing an expression element
346 that contains the length of the bitstring (in bits), then stuffing the
347 bitstring constant itself into however many expression elements are
348 needed to hold it, and then writing another expression element that
349 contains the length of the bitstring. I.E. an expression element at
350 each end of the bitstring records the bitstring length, so you can skip
351 over the expression elements containing the actual bitstring bytes from
352 either end of the bitstring. */
355 write_exp_bitstring (struct stoken str
)
357 int bits
= str
.length
; /* length in bits */
358 int len
= (bits
+ HOST_CHAR_BIT
- 1) / HOST_CHAR_BIT
;
362 /* Compute the number of expression elements required to hold the bitstring,
363 along with one expression element at each end to record the actual
364 bitstring length in bits. */
366 lenelt
= 2 + BYTES_TO_EXP_ELEM (len
);
368 /* Ensure that we have enough available expression elements to store
371 if ((expout_ptr
+ lenelt
) >= expout_size
)
373 expout_size
= max (expout_size
* 2, expout_ptr
+ lenelt
+ 10);
374 expout
= (struct expression
*)
375 xrealloc ((char *) expout
, (sizeof (struct expression
)
376 + EXP_ELEM_TO_BYTES (expout_size
)));
379 /* Write the leading length expression element (which advances the current
380 expression element index), then write the bitstring constant, and then
381 write the trailing length expression element. */
383 write_exp_elt_longcst ((LONGEST
) bits
);
384 strdata
= (char *) &expout
->elts
[expout_ptr
];
385 memcpy (strdata
, str
.ptr
, len
);
386 expout_ptr
+= lenelt
- 2;
387 write_exp_elt_longcst ((LONGEST
) bits
);
390 /* Add the appropriate elements for a minimal symbol to the end of
391 the expression. The rationale behind passing in text_symbol_type and
392 data_symbol_type was so that Modula-2 could pass in WORD for
393 data_symbol_type. Perhaps it still is useful to have those types vary
394 based on the language, but they no longer have names like "int", so
395 the initial rationale is gone. */
398 write_exp_msymbol (struct minimal_symbol
*msymbol
,
399 struct type
*text_symbol_type
,
400 struct type
*data_symbol_type
)
402 struct gdbarch
*gdbarch
= current_gdbarch
;
405 write_exp_elt_opcode (OP_LONG
);
406 /* Let's make the type big enough to hold a 64-bit address. */
407 write_exp_elt_type (builtin_type_CORE_ADDR
);
409 addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
410 if (overlay_debugging
)
411 addr
= symbol_overlayed_address (addr
, SYMBOL_BFD_SECTION (msymbol
));
412 write_exp_elt_longcst ((LONGEST
) addr
);
414 write_exp_elt_opcode (OP_LONG
);
416 if (SYMBOL_BFD_SECTION (msymbol
)
417 && SYMBOL_BFD_SECTION (msymbol
)->flags
& SEC_THREAD_LOCAL
)
419 bfd
*bfd
= SYMBOL_BFD_SECTION (msymbol
)->owner
;
423 if (ofp
->obfd
== bfd
)
426 write_exp_elt_opcode (UNOP_MEMVAL_TLS
);
427 write_exp_elt_objfile (ofp
);
428 write_exp_elt_type (builtin_type (gdbarch
)->nodebug_tls_symbol
);
429 write_exp_elt_opcode (UNOP_MEMVAL_TLS
);
433 write_exp_elt_opcode (UNOP_MEMVAL
);
434 switch (msymbol
->type
)
438 case mst_solib_trampoline
:
439 write_exp_elt_type (builtin_type (gdbarch
)->nodebug_text_symbol
);
446 write_exp_elt_type (builtin_type (gdbarch
)->nodebug_data_symbol
);
450 write_exp_elt_type (builtin_type (gdbarch
)->nodebug_unknown_symbol
);
453 write_exp_elt_opcode (UNOP_MEMVAL
);
456 /* Recognize tokens that start with '$'. These include:
458 $regname A native register name or a "standard
461 $variable A convenience variable with a name chosen
464 $digits Value history with index <digits>, starting
465 from the first value which has index 1.
467 $$digits Value history with index <digits> relative
468 to the last value. I.E. $$0 is the last
469 value, $$1 is the one previous to that, $$2
470 is the one previous to $$1, etc.
472 $ | $0 | $$0 The last value in the value history.
474 $$ An abbreviation for the second to the last
475 value in the value history, I.E. $$1
480 write_dollar_variable (struct stoken str
)
482 struct symbol
*sym
= NULL
;
483 struct minimal_symbol
*msym
= NULL
;
484 struct internalvar
*isym
= NULL
;
486 /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1)
487 and $$digits (equivalent to $<-digits> if you could type that). */
491 /* Double dollar means negate the number and add -1 as well.
492 Thus $$ alone means -1. */
493 if (str
.length
>= 2 && str
.ptr
[1] == '$')
500 /* Just dollars (one or two) */
504 /* Is the rest of the token digits? */
505 for (; i
< str
.length
; i
++)
506 if (!(str
.ptr
[i
] >= '0' && str
.ptr
[i
] <= '9'))
510 i
= atoi (str
.ptr
+ 1 + negate
);
516 /* Handle tokens that refer to machine registers:
517 $ followed by a register name. */
518 i
= frame_map_name_to_regnum (deprecated_safe_get_selected_frame (),
519 str
.ptr
+ 1, str
.length
- 1);
521 goto handle_register
;
523 /* Any names starting with $ are probably debugger internal variables. */
525 isym
= lookup_only_internalvar (copy_name (str
) + 1);
528 write_exp_elt_opcode (OP_INTERNALVAR
);
529 write_exp_elt_intern (isym
);
530 write_exp_elt_opcode (OP_INTERNALVAR
);
534 /* On some systems, such as HP-UX and hppa-linux, certain system routines
535 have names beginning with $ or $$. Check for those, first. */
537 sym
= lookup_symbol (copy_name (str
), (struct block
*) NULL
,
538 VAR_DOMAIN
, (int *) NULL
, (struct symtab
**) NULL
);
541 write_exp_elt_opcode (OP_VAR_VALUE
);
542 write_exp_elt_block (block_found
); /* set by lookup_symbol */
543 write_exp_elt_sym (sym
);
544 write_exp_elt_opcode (OP_VAR_VALUE
);
547 msym
= lookup_minimal_symbol (copy_name (str
), NULL
, NULL
);
550 write_exp_msymbol (msym
,
551 lookup_function_type (builtin_type_int
),
556 /* Any other names are assumed to be debugger internal variables. */
558 write_exp_elt_opcode (OP_INTERNALVAR
);
559 write_exp_elt_intern (create_internalvar (copy_name (str
) + 1));
560 write_exp_elt_opcode (OP_INTERNALVAR
);
563 write_exp_elt_opcode (OP_LAST
);
564 write_exp_elt_longcst ((LONGEST
) i
);
565 write_exp_elt_opcode (OP_LAST
);
568 write_exp_elt_opcode (OP_REGISTER
);
571 write_exp_string (str
);
572 write_exp_elt_opcode (OP_REGISTER
);
578 find_template_name_end (char *p
)
581 int just_seen_right
= 0;
582 int just_seen_colon
= 0;
583 int just_seen_space
= 0;
585 if (!p
|| (*p
!= '<'))
596 /* In future, may want to allow these?? */
599 depth
++; /* start nested template */
600 if (just_seen_colon
|| just_seen_right
|| just_seen_space
)
601 return 0; /* but not after : or :: or > or space */
604 if (just_seen_colon
|| just_seen_right
)
605 return 0; /* end a (nested?) template */
606 just_seen_right
= 1; /* but not after : or :: */
607 if (--depth
== 0) /* also disallow >>, insist on > > */
608 return ++p
; /* if outermost ended, return */
611 if (just_seen_space
|| (just_seen_colon
> 1))
612 return 0; /* nested class spec coming up */
613 just_seen_colon
++; /* we allow :: but not :::: */
618 if (!((*p
>= 'a' && *p
<= 'z') || /* allow token chars */
619 (*p
>= 'A' && *p
<= 'Z') ||
620 (*p
>= '0' && *p
<= '9') ||
621 (*p
== '_') || (*p
== ',') || /* commas for template args */
622 (*p
== '&') || (*p
== '*') || /* pointer and ref types */
623 (*p
== '(') || (*p
== ')') || /* function types */
624 (*p
== '[') || (*p
== ']'))) /* array types */
639 /* Return a null-terminated temporary copy of the name
640 of a string token. */
643 copy_name (struct stoken token
)
645 /* Make sure there's enough space for the token. */
646 if (namecopy_size
< token
.length
+ 1)
648 namecopy_size
= token
.length
+ 1;
649 namecopy
= xrealloc (namecopy
, token
.length
+ 1);
652 memcpy (namecopy
, token
.ptr
, token
.length
);
653 namecopy
[token
.length
] = 0;
658 /* Reverse an expression from suffix form (in which it is constructed)
659 to prefix form (in which we can conveniently print or execute it). */
662 prefixify_expression (struct expression
*expr
)
664 int len
= sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expr
->nelts
);
665 struct expression
*temp
;
666 int inpos
= expr
->nelts
, outpos
= 0;
668 temp
= (struct expression
*) alloca (len
);
670 /* Copy the original expression into temp. */
671 memcpy (temp
, expr
, len
);
673 prefixify_subexp (temp
, expr
, inpos
, outpos
);
676 /* Return the number of exp_elements in the postfix subexpression
677 of EXPR whose operator is at index ENDPOS - 1 in EXPR. */
680 length_of_subexp (struct expression
*expr
, int endpos
)
684 operator_length (expr
, endpos
, &oplen
, &args
);
688 oplen
+= length_of_subexp (expr
, endpos
- oplen
);
695 /* Sets *OPLENP to the length of the operator whose (last) index is
696 ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that
700 operator_length (struct expression
*expr
, int endpos
, int *oplenp
, int *argsp
)
702 expr
->language_defn
->la_exp_desc
->operator_length (expr
, endpos
,
706 /* Default value for operator_length in exp_descriptor vectors. */
709 operator_length_standard (struct expression
*expr
, int endpos
,
710 int *oplenp
, int *argsp
)
714 enum f90_range_type range_type
;
718 error (_("?error in operator_length_standard"));
720 i
= (int) expr
->elts
[endpos
- 1].opcode
;
726 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
727 oplen
= 5 + BYTES_TO_EXP_ELEM (oplen
+ 1);
750 case OP_F77_UNDETERMINED_ARGLIST
:
752 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
755 case OP_OBJC_MSGCALL
: /* Objective C message (method) call */
757 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
772 case UNOP_MEMVAL_TLS
:
790 case STRUCTOP_STRUCT
:
797 case OP_OBJC_NSSTRING
: /* Objective C Foundation Class NSString constant */
798 case OP_OBJC_SELECTOR
: /* Objective C "@selector" pseudo-op */
800 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
801 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
805 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
806 oplen
= (oplen
+ HOST_CHAR_BIT
- 1) / HOST_CHAR_BIT
;
807 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
);
812 args
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
813 args
-= longest_to_int (expr
->elts
[endpos
- 3].longconst
);
819 case TERNOP_SLICE_COUNT
:
824 case MULTI_SUBSCRIPT
:
826 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
829 case BINOP_ASSIGN_MODIFY
:
843 range_type
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
846 case LOW_BOUND_DEFAULT
:
847 case HIGH_BOUND_DEFAULT
:
850 case BOTH_BOUND_DEFAULT
:
853 case NONE_BOUND_DEFAULT
:
861 args
= 1 + (i
< (int) BINOP_END
);
868 /* Copy the subexpression ending just before index INEND in INEXPR
869 into OUTEXPR, starting at index OUTBEG.
870 In the process, convert it from suffix to prefix form. */
873 prefixify_subexp (struct expression
*inexpr
,
874 struct expression
*outexpr
, int inend
, int outbeg
)
880 enum exp_opcode opcode
;
882 operator_length (inexpr
, inend
, &oplen
, &args
);
884 /* Copy the final operator itself, from the end of the input
885 to the beginning of the output. */
887 memcpy (&outexpr
->elts
[outbeg
], &inexpr
->elts
[inend
],
888 EXP_ELEM_TO_BYTES (oplen
));
891 /* Find the lengths of the arg subexpressions. */
892 arglens
= (int *) alloca (args
* sizeof (int));
893 for (i
= args
- 1; i
>= 0; i
--)
895 oplen
= length_of_subexp (inexpr
, inend
);
900 /* Now copy each subexpression, preserving the order of
901 the subexpressions, but prefixifying each one.
902 In this loop, inend starts at the beginning of
903 the expression this level is working on
904 and marches forward over the arguments.
905 outbeg does similarly in the output. */
906 for (i
= 0; i
< args
; i
++)
910 prefixify_subexp (inexpr
, outexpr
, inend
, outbeg
);
915 /* This page contains the two entry points to this file. */
917 /* Read an expression from the string *STRINGPTR points to,
918 parse it, and return a pointer to a struct expression that we malloc.
919 Use block BLOCK as the lexical context for variable names;
920 if BLOCK is zero, use the block of the selected stack frame.
921 Meanwhile, advance *STRINGPTR to point after the expression,
922 at the first nonwhite character that is not part of the expression
923 (possibly a null character).
925 If COMMA is nonzero, stop if a comma is reached. */
928 parse_exp_1 (char **stringptr
, struct block
*block
, int comma
)
930 return parse_exp_in_context (stringptr
, block
, comma
, 0);
933 /* As for parse_exp_1, except that if VOID_CONTEXT_P, then
934 no value is expected from the expression. */
936 static struct expression
*
937 parse_exp_in_context (char **stringptr
, struct block
*block
, int comma
,
940 struct cleanup
*old_chain
;
946 type_stack_depth
= 0;
948 comma_terminates
= comma
;
950 if (lexptr
== 0 || *lexptr
== 0)
951 error_no_arg (_("expression to compute"));
953 old_chain
= make_cleanup (free_funcalls
, 0 /*ignore*/);
956 /* If no context specified, try using the current frame, if any. */
959 block
= get_selected_block (&expression_context_pc
);
961 /* Fall back to using the current source static context, if any. */
965 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
967 block
= BLOCKVECTOR_BLOCK (BLOCKVECTOR (cursal
.symtab
), STATIC_BLOCK
);
970 /* Save the context, if specified by caller, or found above. */
974 expression_context_block
= block
;
975 expression_context_pc
= BLOCK_START (block
);
980 expout
= (struct expression
*)
981 xmalloc (sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expout_size
));
982 expout
->language_defn
= current_language
;
983 make_cleanup (free_current_contents
, &expout
);
985 if (current_language
->la_parser ())
986 current_language
->la_error (NULL
);
988 discard_cleanups (old_chain
);
990 /* Record the actual number of expression elements, and then
991 reallocate the expression memory so that we free up any
994 expout
->nelts
= expout_ptr
;
995 expout
= (struct expression
*)
996 xrealloc ((char *) expout
,
997 sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expout_ptr
));;
999 /* Convert expression from postfix form as generated by yacc
1000 parser, to a prefix form. */
1002 if (expressiondebug
)
1003 dump_raw_expression (expout
, gdb_stdlog
,
1004 "before conversion to prefix form");
1006 prefixify_expression (expout
);
1008 current_language
->la_post_parser (&expout
, void_context_p
);
1010 if (expressiondebug
)
1011 dump_prefix_expression (expout
, gdb_stdlog
);
1013 *stringptr
= lexptr
;
1017 /* Parse STRING as an expression, and complain if this fails
1018 to use up all of the contents of STRING. */
1021 parse_expression (char *string
)
1023 struct expression
*exp
;
1024 exp
= parse_exp_1 (&string
, 0, 0);
1026 error (_("Junk after end of expression."));
1030 /* A post-parser that does nothing */
1033 null_post_parser (struct expression
**exp
, int void_context_p
)
1037 /* Stuff for maintaining a stack of types. Currently just used by C, but
1038 probably useful for any language which declares its types "backwards". */
1041 check_type_stack_depth (void)
1043 if (type_stack_depth
== type_stack_size
)
1045 type_stack_size
*= 2;
1046 type_stack
= (union type_stack_elt
*)
1047 xrealloc ((char *) type_stack
, type_stack_size
* sizeof (*type_stack
));
1052 push_type (enum type_pieces tp
)
1054 check_type_stack_depth ();
1055 type_stack
[type_stack_depth
++].piece
= tp
;
1059 push_type_int (int n
)
1061 check_type_stack_depth ();
1062 type_stack
[type_stack_depth
++].int_val
= n
;
1066 push_type_address_space (char *string
)
1068 push_type_int (address_space_name_to_int (string
));
1074 if (type_stack_depth
)
1075 return type_stack
[--type_stack_depth
].piece
;
1082 if (type_stack_depth
)
1083 return type_stack
[--type_stack_depth
].int_val
;
1084 /* "Can't happen". */
1088 /* Pop the type stack and return the type which corresponds to FOLLOW_TYPE
1089 as modified by all the stuff on the stack. */
1091 follow_types (struct type
*follow_type
)
1095 int make_volatile
= 0;
1096 int make_addr_space
= 0;
1098 struct type
*range_type
;
1101 switch (pop_type ())
1106 follow_type
= make_cv_type (make_const
,
1107 TYPE_VOLATILE (follow_type
),
1110 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1113 if (make_addr_space
)
1114 follow_type
= make_type_with_address_space (follow_type
,
1116 make_const
= make_volatile
= 0;
1117 make_addr_space
= 0;
1125 case tp_space_identifier
:
1126 make_addr_space
= pop_type_int ();
1129 follow_type
= lookup_pointer_type (follow_type
);
1131 follow_type
= make_cv_type (make_const
,
1132 TYPE_VOLATILE (follow_type
),
1135 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1138 if (make_addr_space
)
1139 follow_type
= make_type_with_address_space (follow_type
,
1141 make_const
= make_volatile
= 0;
1142 make_addr_space
= 0;
1145 follow_type
= lookup_reference_type (follow_type
);
1147 follow_type
= make_cv_type (make_const
,
1148 TYPE_VOLATILE (follow_type
),
1151 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1154 if (make_addr_space
)
1155 follow_type
= make_type_with_address_space (follow_type
,
1157 make_const
= make_volatile
= 0;
1158 make_addr_space
= 0;
1161 array_size
= pop_type_int ();
1162 /* FIXME-type-allocation: need a way to free this type when we are
1165 create_range_type ((struct type
*) NULL
,
1166 builtin_type_int
, 0,
1167 array_size
>= 0 ? array_size
- 1 : 0);
1169 create_array_type ((struct type
*) NULL
,
1170 follow_type
, range_type
);
1172 TYPE_ARRAY_UPPER_BOUND_TYPE (follow_type
)
1173 = BOUND_CANNOT_BE_DETERMINED
;
1176 /* FIXME-type-allocation: need a way to free this type when we are
1178 follow_type
= lookup_function_type (follow_type
);
1184 /* This function avoids direct calls to fprintf
1185 in the parser generated debug code. */
1187 parser_fprintf (FILE *x
, const char *y
, ...)
1192 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1195 fprintf_unfiltered (gdb_stderr
, " Unknown FILE used.\n");
1196 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1202 _initialize_parse (void)
1204 type_stack_size
= 80;
1205 type_stack_depth
= 0;
1206 type_stack
= (union type_stack_elt
*)
1207 xmalloc (type_stack_size
* sizeof (*type_stack
));
1209 add_setshow_zinteger_cmd ("expression", class_maintenance
,
1210 &expressiondebug
, _("\
1211 Set expression debugging."), _("\
1212 Show expression debugging."), _("\
1213 When non-zero, the internal representation of expressions will be printed."),
1215 show_expressiondebug
,
1216 &setdebuglist
, &showdebuglist
);