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
)
665 sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expr
->nelts
);
666 struct expression
*temp
;
667 int inpos
= expr
->nelts
, outpos
= 0;
669 temp
= (struct expression
*) alloca (len
);
671 /* Copy the original expression into temp. */
672 memcpy (temp
, expr
, len
);
674 prefixify_subexp (temp
, expr
, inpos
, outpos
);
677 /* Return the number of exp_elements in the postfix subexpression
678 of EXPR whose operator is at index ENDPOS - 1 in EXPR. */
681 length_of_subexp (struct expression
*expr
, int endpos
)
685 operator_length (expr
, endpos
, &oplen
, &args
);
689 oplen
+= length_of_subexp (expr
, endpos
- oplen
);
696 /* Sets *OPLENP to the length of the operator whose (last) index is
697 ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that
701 operator_length (struct expression
*expr
, int endpos
, int *oplenp
, int *argsp
)
703 expr
->language_defn
->la_exp_desc
->operator_length (expr
, endpos
,
707 /* Default value for operator_length in exp_descriptor vectors. */
710 operator_length_standard (struct expression
*expr
, int endpos
,
711 int *oplenp
, int *argsp
)
715 enum f90_range_type range_type
;
719 error (_("?error in operator_length_standard"));
721 i
= (int) expr
->elts
[endpos
- 1].opcode
;
727 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
728 oplen
= 5 + BYTES_TO_EXP_ELEM (oplen
+ 1);
751 case OP_F77_UNDETERMINED_ARGLIST
:
753 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
756 case OP_OBJC_MSGCALL
: /* Objective C message (method) call */
758 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
773 case UNOP_MEMVAL_TLS
:
791 case STRUCTOP_STRUCT
:
798 case OP_OBJC_NSSTRING
: /* Objective C Foundation Class NSString constant */
799 case OP_OBJC_SELECTOR
: /* Objective C "@selector" pseudo-op */
801 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
802 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
806 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
807 oplen
= (oplen
+ HOST_CHAR_BIT
- 1) / HOST_CHAR_BIT
;
808 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
);
813 args
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
814 args
-= longest_to_int (expr
->elts
[endpos
- 3].longconst
);
820 case TERNOP_SLICE_COUNT
:
825 case MULTI_SUBSCRIPT
:
827 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
830 case BINOP_ASSIGN_MODIFY
:
844 range_type
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
847 case LOW_BOUND_DEFAULT
:
848 case HIGH_BOUND_DEFAULT
:
851 case BOTH_BOUND_DEFAULT
:
854 case NONE_BOUND_DEFAULT
:
862 args
= 1 + (i
< (int) BINOP_END
);
869 /* Copy the subexpression ending just before index INEND in INEXPR
870 into OUTEXPR, starting at index OUTBEG.
871 In the process, convert it from suffix to prefix form. */
874 prefixify_subexp (struct expression
*inexpr
,
875 struct expression
*outexpr
, int inend
, int outbeg
)
881 enum exp_opcode opcode
;
883 operator_length (inexpr
, inend
, &oplen
, &args
);
885 /* Copy the final operator itself, from the end of the input
886 to the beginning of the output. */
888 memcpy (&outexpr
->elts
[outbeg
], &inexpr
->elts
[inend
],
889 EXP_ELEM_TO_BYTES (oplen
));
892 /* Find the lengths of the arg subexpressions. */
893 arglens
= (int *) alloca (args
* sizeof (int));
894 for (i
= args
- 1; i
>= 0; i
--)
896 oplen
= length_of_subexp (inexpr
, inend
);
901 /* Now copy each subexpression, preserving the order of
902 the subexpressions, but prefixifying each one.
903 In this loop, inend starts at the beginning of
904 the expression this level is working on
905 and marches forward over the arguments.
906 outbeg does similarly in the output. */
907 for (i
= 0; i
< args
; i
++)
911 prefixify_subexp (inexpr
, outexpr
, inend
, outbeg
);
916 /* This page contains the two entry points to this file. */
918 /* Read an expression from the string *STRINGPTR points to,
919 parse it, and return a pointer to a struct expression that we malloc.
920 Use block BLOCK as the lexical context for variable names;
921 if BLOCK is zero, use the block of the selected stack frame.
922 Meanwhile, advance *STRINGPTR to point after the expression,
923 at the first nonwhite character that is not part of the expression
924 (possibly a null character).
926 If COMMA is nonzero, stop if a comma is reached. */
929 parse_exp_1 (char **stringptr
, struct block
*block
, int comma
)
931 return parse_exp_in_context (stringptr
, block
, comma
, 0);
934 /* As for parse_exp_1, except that if VOID_CONTEXT_P, then
935 no value is expected from the expression. */
937 static struct expression
*
938 parse_exp_in_context (char **stringptr
, struct block
*block
, int comma
,
941 struct cleanup
*old_chain
;
947 type_stack_depth
= 0;
949 comma_terminates
= comma
;
951 if (lexptr
== 0 || *lexptr
== 0)
952 error_no_arg (_("expression to compute"));
954 old_chain
= make_cleanup (free_funcalls
, 0 /*ignore*/);
957 /* If no context specified, try using the current frame, if any. */
960 block
= get_selected_block (&expression_context_pc
);
962 /* Fall back to using the current source static context, if any. */
966 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
968 block
= BLOCKVECTOR_BLOCK (BLOCKVECTOR (cursal
.symtab
), STATIC_BLOCK
);
971 /* Save the context, if specified by caller, or found above. */
975 expression_context_block
= block
;
976 expression_context_pc
= BLOCK_START (block
);
981 expout
= (struct expression
*)
982 xmalloc (sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expout_size
));
983 expout
->language_defn
= current_language
;
984 make_cleanup (free_current_contents
, &expout
);
986 if (current_language
->la_parser ())
987 current_language
->la_error (NULL
);
989 discard_cleanups (old_chain
);
991 /* Record the actual number of expression elements, and then
992 reallocate the expression memory so that we free up any
995 expout
->nelts
= expout_ptr
;
996 expout
= (struct expression
*)
997 xrealloc ((char *) expout
,
998 sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expout_ptr
));;
1000 /* Convert expression from postfix form as generated by yacc
1001 parser, to a prefix form. */
1003 if (expressiondebug
)
1004 dump_raw_expression (expout
, gdb_stdlog
,
1005 "before conversion to prefix form");
1007 prefixify_expression (expout
);
1009 current_language
->la_post_parser (&expout
, void_context_p
);
1011 if (expressiondebug
)
1012 dump_prefix_expression (expout
, gdb_stdlog
);
1014 *stringptr
= lexptr
;
1018 /* Parse STRING as an expression, and complain if this fails
1019 to use up all of the contents of STRING. */
1022 parse_expression (char *string
)
1024 struct expression
*exp
;
1025 exp
= parse_exp_1 (&string
, 0, 0);
1027 error (_("Junk after end of expression."));
1032 /* As for parse_expression, except that if VOID_CONTEXT_P, then
1033 no value is expected from the expression. */
1036 parse_expression_in_context (char *string
, int void_context_p
)
1038 struct expression
*exp
;
1039 exp
= parse_exp_in_context (&string
, 0, 0, void_context_p
);
1040 if (*string
!= '\000')
1041 error (_("Junk after end of expression."));
1045 /* A post-parser that does nothing */
1048 null_post_parser (struct expression
**exp
, int void_context_p
)
1052 /* Stuff for maintaining a stack of types. Currently just used by C, but
1053 probably useful for any language which declares its types "backwards". */
1056 check_type_stack_depth (void)
1058 if (type_stack_depth
== type_stack_size
)
1060 type_stack_size
*= 2;
1061 type_stack
= (union type_stack_elt
*)
1062 xrealloc ((char *) type_stack
, type_stack_size
* sizeof (*type_stack
));
1067 push_type (enum type_pieces tp
)
1069 check_type_stack_depth ();
1070 type_stack
[type_stack_depth
++].piece
= tp
;
1074 push_type_int (int n
)
1076 check_type_stack_depth ();
1077 type_stack
[type_stack_depth
++].int_val
= n
;
1081 push_type_address_space (char *string
)
1083 push_type_int (address_space_name_to_int (string
));
1089 if (type_stack_depth
)
1090 return type_stack
[--type_stack_depth
].piece
;
1097 if (type_stack_depth
)
1098 return type_stack
[--type_stack_depth
].int_val
;
1099 /* "Can't happen". */
1103 /* Pop the type stack and return the type which corresponds to FOLLOW_TYPE
1104 as modified by all the stuff on the stack. */
1106 follow_types (struct type
*follow_type
)
1110 int make_volatile
= 0;
1111 int make_addr_space
= 0;
1113 struct type
*range_type
;
1116 switch (pop_type ())
1121 follow_type
= make_cv_type (make_const
,
1122 TYPE_VOLATILE (follow_type
),
1125 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1128 if (make_addr_space
)
1129 follow_type
= make_type_with_address_space (follow_type
,
1131 make_const
= make_volatile
= 0;
1132 make_addr_space
= 0;
1140 case tp_space_identifier
:
1141 make_addr_space
= pop_type_int ();
1144 follow_type
= lookup_pointer_type (follow_type
);
1146 follow_type
= make_cv_type (make_const
,
1147 TYPE_VOLATILE (follow_type
),
1150 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1153 if (make_addr_space
)
1154 follow_type
= make_type_with_address_space (follow_type
,
1156 make_const
= make_volatile
= 0;
1157 make_addr_space
= 0;
1160 follow_type
= lookup_reference_type (follow_type
);
1162 follow_type
= make_cv_type (make_const
,
1163 TYPE_VOLATILE (follow_type
),
1166 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1169 if (make_addr_space
)
1170 follow_type
= make_type_with_address_space (follow_type
,
1172 make_const
= make_volatile
= 0;
1173 make_addr_space
= 0;
1176 array_size
= pop_type_int ();
1177 /* FIXME-type-allocation: need a way to free this type when we are
1180 create_range_type ((struct type
*) NULL
,
1181 builtin_type_int
, 0,
1182 array_size
>= 0 ? array_size
- 1 : 0);
1184 create_array_type ((struct type
*) NULL
,
1185 follow_type
, range_type
);
1187 TYPE_ARRAY_UPPER_BOUND_TYPE (follow_type
)
1188 = BOUND_CANNOT_BE_DETERMINED
;
1191 /* FIXME-type-allocation: need a way to free this type when we are
1193 follow_type
= lookup_function_type (follow_type
);
1199 /* This function avoids direct calls to fprintf
1200 in the parser generated debug code. */
1202 parser_fprintf (FILE *x
, const char *y
, ...)
1207 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1210 fprintf_unfiltered (gdb_stderr
, " Unknown FILE used.\n");
1211 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1217 _initialize_parse (void)
1219 type_stack_size
= 80;
1220 type_stack_depth
= 0;
1221 type_stack
= (union type_stack_elt
*)
1222 xmalloc (type_stack_size
* sizeof (*type_stack
));
1224 add_setshow_zinteger_cmd ("expression", class_maintenance
,
1225 &expressiondebug
, _("\
1226 Set expression debugging."), _("\
1227 Show expression debugging."), _("\
1228 When non-zero, the internal representation of expressions will be printed."),
1230 show_expressiondebug
,
1231 &setdebuglist
, &showdebuglist
);