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 2 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, write to the Free Software
23 Foundation, Inc., 51 Franklin Street, Fifth Floor,
24 Boston, MA 02110-1301, USA. */
26 /* Parse an expression from text in a string,
27 and return the result as a struct expression pointer.
28 That structure contains arithmetic operations in reverse polish,
29 with constants represented by operations that are followed by special data.
30 See expression.h for the details of the format.
31 What is important here is that it can be built up sequentially
32 during the process of parsing; the lower levels of the tree always
33 come first in the result. */
38 #include "gdb_string.h"
42 #include "expression.h"
47 #include "parser-defs.h"
49 #include "symfile.h" /* for overlay functions */
52 #include "gdb_assert.h"
57 /* Standard set of definitions for printing, dumping, prefixifying,
58 * and evaluating expressions. */
60 const struct exp_descriptor exp_descriptor_standard
=
62 print_subexp_standard
,
63 operator_length_standard
,
65 dump_subexp_body_standard
,
66 evaluate_subexp_standard
69 /* Global variables declared in parser-defs.h (and commented there). */
70 struct expression
*expout
;
73 struct block
*expression_context_block
;
74 CORE_ADDR expression_context_pc
;
75 struct block
*innermost_block
;
77 union type_stack_elt
*type_stack
;
78 int type_stack_depth
, type_stack_size
;
84 /* A temporary buffer for identifiers, so we can null-terminate them.
86 We allocate this with xrealloc. parse_exp_1 used to allocate with
87 alloca, using the size of the whole expression as a conservative
88 estimate of the space needed. However, macro expansion can
89 introduce names longer than the original expression; there's no
90 practical way to know beforehand how large that might be. */
94 static 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
);
102 static void free_funcalls (void *ignore
);
104 static void prefixify_expression (struct expression
*);
106 static void prefixify_subexp (struct expression
*, struct expression
*, int,
109 static struct expression
*parse_exp_in_context (char **, struct block
*, int,
112 void _initialize_parse (void);
114 /* Data structure for saving values of arglist_len for function calls whose
115 arguments contain other function calls. */
119 struct funcall
*next
;
123 static struct funcall
*funcall_chain
;
125 /* Begin counting arguments for a function call,
126 saving the data about any containing call. */
133 new = (struct funcall
*) xmalloc (sizeof (struct funcall
));
134 new->next
= funcall_chain
;
135 new->arglist_len
= arglist_len
;
140 /* Return the number of arguments in a function call just terminated,
141 and restore the data for the containing function call. */
146 int val
= arglist_len
;
147 struct funcall
*call
= funcall_chain
;
148 funcall_chain
= call
->next
;
149 arglist_len
= call
->arglist_len
;
154 /* Free everything in the funcall chain.
155 Used when there is an error inside parsing. */
158 free_funcalls (void *ignore
)
160 struct funcall
*call
, *next
;
162 for (call
= funcall_chain
; call
; call
= next
)
169 /* This page contains the functions for adding data to the struct expression
170 being constructed. */
172 /* Add one element to the end of the expression. */
174 /* To avoid a bug in the Sun 4 compiler, we pass things that can fit into
175 a register through here */
178 write_exp_elt (union exp_element expelt
)
180 if (expout_ptr
>= expout_size
)
183 expout
= (struct expression
*)
184 xrealloc ((char *) expout
, sizeof (struct expression
)
185 + EXP_ELEM_TO_BYTES (expout_size
));
187 expout
->elts
[expout_ptr
++] = expelt
;
191 write_exp_elt_opcode (enum exp_opcode expelt
)
193 union exp_element tmp
;
194 memset (&tmp
, 0, sizeof (union exp_element
));
202 write_exp_elt_sym (struct symbol
*expelt
)
204 union exp_element tmp
;
205 memset (&tmp
, 0, sizeof (union exp_element
));
213 write_exp_elt_block (struct block
*b
)
215 union exp_element tmp
;
216 memset (&tmp
, 0, sizeof (union exp_element
));
222 write_exp_elt_objfile (struct objfile
*objfile
)
224 union exp_element tmp
;
225 memset (&tmp
, 0, sizeof (union exp_element
));
226 tmp
.objfile
= objfile
;
231 write_exp_elt_longcst (LONGEST expelt
)
233 union exp_element tmp
;
234 memset (&tmp
, 0, sizeof (union exp_element
));
236 tmp
.longconst
= expelt
;
242 write_exp_elt_dblcst (DOUBLEST expelt
)
244 union exp_element tmp
;
245 memset (&tmp
, 0, sizeof (union exp_element
));
247 tmp
.doubleconst
= expelt
;
253 write_exp_elt_type (struct type
*expelt
)
255 union exp_element tmp
;
256 memset (&tmp
, 0, sizeof (union exp_element
));
264 write_exp_elt_intern (struct internalvar
*expelt
)
266 union exp_element tmp
;
267 memset (&tmp
, 0, sizeof (union exp_element
));
269 tmp
.internalvar
= expelt
;
274 /* Add a string constant to the end of the expression.
276 String constants are stored by first writing an expression element
277 that contains the length of the string, then stuffing the string
278 constant itself into however many expression elements are needed
279 to hold it, and then writing another expression element that contains
280 the length of the string. I.E. an expression element at each end of
281 the string records the string length, so you can skip over the
282 expression elements containing the actual string bytes from either
283 end of the string. Note that this also allows gdb to handle
284 strings with embedded null bytes, as is required for some languages.
286 Don't be fooled by the fact that the string is null byte terminated,
287 this is strictly for the convenience of debugging gdb itself. Gdb
288 Gdb does not depend up the string being null terminated, since the
289 actual length is recorded in expression elements at each end of the
290 string. The null byte is taken into consideration when computing how
291 many expression elements are required to hold the string constant, of
296 write_exp_string (struct stoken str
)
298 int len
= str
.length
;
302 /* Compute the number of expression elements required to hold the string
303 (including a null byte terminator), along with one expression element
304 at each end to record the actual string length (not including the
305 null byte terminator). */
307 lenelt
= 2 + BYTES_TO_EXP_ELEM (len
+ 1);
309 /* Ensure that we have enough available expression elements to store
312 if ((expout_ptr
+ lenelt
) >= expout_size
)
314 expout_size
= max (expout_size
* 2, expout_ptr
+ lenelt
+ 10);
315 expout
= (struct expression
*)
316 xrealloc ((char *) expout
, (sizeof (struct expression
)
317 + EXP_ELEM_TO_BYTES (expout_size
)));
320 /* Write the leading length expression element (which advances the current
321 expression element index), then write the string constant followed by a
322 terminating null byte, and then write the trailing length expression
325 write_exp_elt_longcst ((LONGEST
) len
);
326 strdata
= (char *) &expout
->elts
[expout_ptr
];
327 memcpy (strdata
, str
.ptr
, len
);
328 *(strdata
+ len
) = '\0';
329 expout_ptr
+= lenelt
- 2;
330 write_exp_elt_longcst ((LONGEST
) len
);
333 /* Add a bitstring constant to the end of the expression.
335 Bitstring constants are stored by first writing an expression element
336 that contains the length of the bitstring (in bits), then stuffing the
337 bitstring constant itself into however many expression elements are
338 needed to hold it, and then writing another expression element that
339 contains the length of the bitstring. I.E. an expression element at
340 each end of the bitstring records the bitstring length, so you can skip
341 over the expression elements containing the actual bitstring bytes from
342 either end of the bitstring. */
345 write_exp_bitstring (struct stoken str
)
347 int bits
= str
.length
; /* length in bits */
348 int len
= (bits
+ HOST_CHAR_BIT
- 1) / HOST_CHAR_BIT
;
352 /* Compute the number of expression elements required to hold the bitstring,
353 along with one expression element at each end to record the actual
354 bitstring length in bits. */
356 lenelt
= 2 + BYTES_TO_EXP_ELEM (len
);
358 /* Ensure that we have enough available expression elements to store
361 if ((expout_ptr
+ lenelt
) >= expout_size
)
363 expout_size
= max (expout_size
* 2, expout_ptr
+ lenelt
+ 10);
364 expout
= (struct expression
*)
365 xrealloc ((char *) expout
, (sizeof (struct expression
)
366 + EXP_ELEM_TO_BYTES (expout_size
)));
369 /* Write the leading length expression element (which advances the current
370 expression element index), then write the bitstring constant, and then
371 write the trailing length expression element. */
373 write_exp_elt_longcst ((LONGEST
) bits
);
374 strdata
= (char *) &expout
->elts
[expout_ptr
];
375 memcpy (strdata
, str
.ptr
, len
);
376 expout_ptr
+= lenelt
- 2;
377 write_exp_elt_longcst ((LONGEST
) bits
);
380 /* Add the appropriate elements for a minimal symbol to the end of
381 the expression. The rationale behind passing in text_symbol_type and
382 data_symbol_type was so that Modula-2 could pass in WORD for
383 data_symbol_type. Perhaps it still is useful to have those types vary
384 based on the language, but they no longer have names like "int", so
385 the initial rationale is gone. */
388 write_exp_msymbol (struct minimal_symbol
*msymbol
,
389 struct type
*text_symbol_type
,
390 struct type
*data_symbol_type
)
392 struct gdbarch
*gdbarch
= current_gdbarch
;
395 write_exp_elt_opcode (OP_LONG
);
396 /* Let's make the type big enough to hold a 64-bit address. */
397 write_exp_elt_type (builtin_type_CORE_ADDR
);
399 addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
400 if (overlay_debugging
)
401 addr
= symbol_overlayed_address (addr
, SYMBOL_BFD_SECTION (msymbol
));
402 write_exp_elt_longcst ((LONGEST
) addr
);
404 write_exp_elt_opcode (OP_LONG
);
406 if (SYMBOL_BFD_SECTION (msymbol
)
407 && SYMBOL_BFD_SECTION (msymbol
)->flags
& SEC_THREAD_LOCAL
)
409 bfd
*bfd
= SYMBOL_BFD_SECTION (msymbol
)->owner
;
413 if (ofp
->obfd
== bfd
)
416 write_exp_elt_opcode (UNOP_MEMVAL_TLS
);
417 write_exp_elt_objfile (ofp
);
418 write_exp_elt_type (builtin_type (gdbarch
)->nodebug_tls_symbol
);
419 write_exp_elt_opcode (UNOP_MEMVAL_TLS
);
423 write_exp_elt_opcode (UNOP_MEMVAL
);
424 switch (msymbol
->type
)
428 case mst_solib_trampoline
:
429 write_exp_elt_type (builtin_type (gdbarch
)->nodebug_text_symbol
);
436 write_exp_elt_type (builtin_type (gdbarch
)->nodebug_data_symbol
);
440 write_exp_elt_type (builtin_type (gdbarch
)->nodebug_unknown_symbol
);
443 write_exp_elt_opcode (UNOP_MEMVAL
);
446 /* Recognize tokens that start with '$'. These include:
448 $regname A native register name or a "standard
451 $variable A convenience variable with a name chosen
454 $digits Value history with index <digits>, starting
455 from the first value which has index 1.
457 $$digits Value history with index <digits> relative
458 to the last value. I.E. $$0 is the last
459 value, $$1 is the one previous to that, $$2
460 is the one previous to $$1, etc.
462 $ | $0 | $$0 The last value in the value history.
464 $$ An abbreviation for the second to the last
465 value in the value history, I.E. $$1
470 write_dollar_variable (struct stoken str
)
472 struct symbol
*sym
= NULL
;
473 struct minimal_symbol
*msym
= NULL
;
475 /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1)
476 and $$digits (equivalent to $<-digits> if you could type that). */
480 /* Double dollar means negate the number and add -1 as well.
481 Thus $$ alone means -1. */
482 if (str
.length
>= 2 && str
.ptr
[1] == '$')
489 /* Just dollars (one or two) */
493 /* Is the rest of the token digits? */
494 for (; i
< str
.length
; i
++)
495 if (!(str
.ptr
[i
] >= '0' && str
.ptr
[i
] <= '9'))
499 i
= atoi (str
.ptr
+ 1 + negate
);
505 /* Handle tokens that refer to machine registers:
506 $ followed by a register name. */
507 i
= frame_map_name_to_regnum (deprecated_safe_get_selected_frame (),
508 str
.ptr
+ 1, str
.length
- 1);
510 goto handle_register
;
512 /* On some systems, such as HP-UX and hppa-linux, certain system routines
513 have names beginning with $ or $$. Check for those, first. */
515 sym
= lookup_symbol (copy_name (str
), (struct block
*) NULL
,
516 VAR_DOMAIN
, (int *) NULL
, (struct symtab
**) NULL
);
519 write_exp_elt_opcode (OP_VAR_VALUE
);
520 write_exp_elt_block (block_found
); /* set by lookup_symbol */
521 write_exp_elt_sym (sym
);
522 write_exp_elt_opcode (OP_VAR_VALUE
);
525 msym
= lookup_minimal_symbol (copy_name (str
), NULL
, NULL
);
528 write_exp_msymbol (msym
,
529 lookup_function_type (builtin_type_int
),
534 /* Any other names starting in $ are debugger internal variables. */
536 write_exp_elt_opcode (OP_INTERNALVAR
);
537 write_exp_elt_intern (lookup_internalvar (copy_name (str
) + 1));
538 write_exp_elt_opcode (OP_INTERNALVAR
);
541 write_exp_elt_opcode (OP_LAST
);
542 write_exp_elt_longcst ((LONGEST
) i
);
543 write_exp_elt_opcode (OP_LAST
);
546 write_exp_elt_opcode (OP_REGISTER
);
549 write_exp_string (str
);
550 write_exp_elt_opcode (OP_REGISTER
);
556 find_template_name_end (char *p
)
559 int just_seen_right
= 0;
560 int just_seen_colon
= 0;
561 int just_seen_space
= 0;
563 if (!p
|| (*p
!= '<'))
574 /* In future, may want to allow these?? */
577 depth
++; /* start nested template */
578 if (just_seen_colon
|| just_seen_right
|| just_seen_space
)
579 return 0; /* but not after : or :: or > or space */
582 if (just_seen_colon
|| just_seen_right
)
583 return 0; /* end a (nested?) template */
584 just_seen_right
= 1; /* but not after : or :: */
585 if (--depth
== 0) /* also disallow >>, insist on > > */
586 return ++p
; /* if outermost ended, return */
589 if (just_seen_space
|| (just_seen_colon
> 1))
590 return 0; /* nested class spec coming up */
591 just_seen_colon
++; /* we allow :: but not :::: */
596 if (!((*p
>= 'a' && *p
<= 'z') || /* allow token chars */
597 (*p
>= 'A' && *p
<= 'Z') ||
598 (*p
>= '0' && *p
<= '9') ||
599 (*p
== '_') || (*p
== ',') || /* commas for template args */
600 (*p
== '&') || (*p
== '*') || /* pointer and ref types */
601 (*p
== '(') || (*p
== ')') || /* function types */
602 (*p
== '[') || (*p
== ']'))) /* array types */
617 /* Return a null-terminated temporary copy of the name
618 of a string token. */
621 copy_name (struct stoken token
)
623 /* Make sure there's enough space for the token. */
624 if (namecopy_size
< token
.length
+ 1)
626 namecopy_size
= token
.length
+ 1;
627 namecopy
= xrealloc (namecopy
, token
.length
+ 1);
630 memcpy (namecopy
, token
.ptr
, token
.length
);
631 namecopy
[token
.length
] = 0;
636 /* Reverse an expression from suffix form (in which it is constructed)
637 to prefix form (in which we can conveniently print or execute it). */
640 prefixify_expression (struct expression
*expr
)
643 sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expr
->nelts
);
644 struct expression
*temp
;
645 int inpos
= expr
->nelts
, outpos
= 0;
647 temp
= (struct expression
*) alloca (len
);
649 /* Copy the original expression into temp. */
650 memcpy (temp
, expr
, len
);
652 prefixify_subexp (temp
, expr
, inpos
, outpos
);
655 /* Return the number of exp_elements in the postfix subexpression
656 of EXPR whose operator is at index ENDPOS - 1 in EXPR. */
659 length_of_subexp (struct expression
*expr
, int endpos
)
663 operator_length (expr
, endpos
, &oplen
, &args
);
667 oplen
+= length_of_subexp (expr
, endpos
- oplen
);
674 /* Sets *OPLENP to the length of the operator whose (last) index is
675 ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that
679 operator_length (struct expression
*expr
, int endpos
, int *oplenp
, int *argsp
)
681 expr
->language_defn
->la_exp_desc
->operator_length (expr
, endpos
,
685 /* Default value for operator_length in exp_descriptor vectors. */
688 operator_length_standard (struct expression
*expr
, int endpos
,
689 int *oplenp
, int *argsp
)
693 enum f90_range_type range_type
;
697 error (_("?error in operator_length_standard"));
699 i
= (int) expr
->elts
[endpos
- 1].opcode
;
705 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
706 oplen
= 5 + BYTES_TO_EXP_ELEM (oplen
+ 1);
728 case OP_F77_UNDETERMINED_ARGLIST
:
730 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
733 case OP_OBJC_MSGCALL
: /* Objective C message (method) call */
735 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
750 case UNOP_MEMVAL_TLS
:
768 case STRUCTOP_STRUCT
:
775 case OP_OBJC_NSSTRING
: /* Objective C Foundation Class NSString constant */
776 case OP_OBJC_SELECTOR
: /* Objective C "@selector" pseudo-op */
778 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
779 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
783 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
784 oplen
= (oplen
+ HOST_CHAR_BIT
- 1) / HOST_CHAR_BIT
;
785 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
);
790 args
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
791 args
-= longest_to_int (expr
->elts
[endpos
- 3].longconst
);
797 case TERNOP_SLICE_COUNT
:
802 case MULTI_SUBSCRIPT
:
804 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
807 case BINOP_ASSIGN_MODIFY
:
821 range_type
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
824 case LOW_BOUND_DEFAULT
:
825 case HIGH_BOUND_DEFAULT
:
828 case BOTH_BOUND_DEFAULT
:
831 case NONE_BOUND_DEFAULT
:
839 args
= 1 + (i
< (int) BINOP_END
);
846 /* Copy the subexpression ending just before index INEND in INEXPR
847 into OUTEXPR, starting at index OUTBEG.
848 In the process, convert it from suffix to prefix form. */
851 prefixify_subexp (struct expression
*inexpr
,
852 struct expression
*outexpr
, int inend
, int outbeg
)
858 enum exp_opcode opcode
;
860 operator_length (inexpr
, inend
, &oplen
, &args
);
862 /* Copy the final operator itself, from the end of the input
863 to the beginning of the output. */
865 memcpy (&outexpr
->elts
[outbeg
], &inexpr
->elts
[inend
],
866 EXP_ELEM_TO_BYTES (oplen
));
869 /* Find the lengths of the arg subexpressions. */
870 arglens
= (int *) alloca (args
* sizeof (int));
871 for (i
= args
- 1; i
>= 0; i
--)
873 oplen
= length_of_subexp (inexpr
, inend
);
878 /* Now copy each subexpression, preserving the order of
879 the subexpressions, but prefixifying each one.
880 In this loop, inend starts at the beginning of
881 the expression this level is working on
882 and marches forward over the arguments.
883 outbeg does similarly in the output. */
884 for (i
= 0; i
< args
; i
++)
888 prefixify_subexp (inexpr
, outexpr
, inend
, outbeg
);
893 /* This page contains the two entry points to this file. */
895 /* Read an expression from the string *STRINGPTR points to,
896 parse it, and return a pointer to a struct expression that we malloc.
897 Use block BLOCK as the lexical context for variable names;
898 if BLOCK is zero, use the block of the selected stack frame.
899 Meanwhile, advance *STRINGPTR to point after the expression,
900 at the first nonwhite character that is not part of the expression
901 (possibly a null character).
903 If COMMA is nonzero, stop if a comma is reached. */
906 parse_exp_1 (char **stringptr
, struct block
*block
, int comma
)
908 return parse_exp_in_context (stringptr
, block
, comma
, 0);
911 /* As for parse_exp_1, except that if VOID_CONTEXT_P, then
912 no value is expected from the expression. */
914 static struct expression
*
915 parse_exp_in_context (char **stringptr
, struct block
*block
, int comma
,
918 struct cleanup
*old_chain
;
924 type_stack_depth
= 0;
926 comma_terminates
= comma
;
928 if (lexptr
== 0 || *lexptr
== 0)
929 error_no_arg (_("expression to compute"));
931 old_chain
= make_cleanup (free_funcalls
, 0 /*ignore*/);
934 /* If no context specified, try using the current frame, if any. */
937 block
= get_selected_block (&expression_context_pc
);
939 /* Fall back to using the current source static context, if any. */
943 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
945 block
= BLOCKVECTOR_BLOCK (BLOCKVECTOR (cursal
.symtab
), STATIC_BLOCK
);
948 /* Save the context, if specified by caller, or found above. */
952 expression_context_block
= block
;
953 expression_context_pc
= BLOCK_START (block
);
958 expout
= (struct expression
*)
959 xmalloc (sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expout_size
));
960 expout
->language_defn
= current_language
;
961 make_cleanup (free_current_contents
, &expout
);
963 if (current_language
->la_parser ())
964 current_language
->la_error (NULL
);
966 discard_cleanups (old_chain
);
968 /* Record the actual number of expression elements, and then
969 reallocate the expression memory so that we free up any
972 expout
->nelts
= expout_ptr
;
973 expout
= (struct expression
*)
974 xrealloc ((char *) expout
,
975 sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expout_ptr
));;
977 /* Convert expression from postfix form as generated by yacc
978 parser, to a prefix form. */
981 dump_raw_expression (expout
, gdb_stdlog
,
982 "before conversion to prefix form");
984 prefixify_expression (expout
);
986 current_language
->la_post_parser (&expout
, void_context_p
);
989 dump_prefix_expression (expout
, gdb_stdlog
);
995 /* Parse STRING as an expression, and complain if this fails
996 to use up all of the contents of STRING. */
999 parse_expression (char *string
)
1001 struct expression
*exp
;
1002 exp
= parse_exp_1 (&string
, 0, 0);
1004 error (_("Junk after end of expression."));
1009 /* As for parse_expression, except that if VOID_CONTEXT_P, then
1010 no value is expected from the expression. */
1013 parse_expression_in_context (char *string
, int void_context_p
)
1015 struct expression
*exp
;
1016 exp
= parse_exp_in_context (&string
, 0, 0, void_context_p
);
1017 if (*string
!= '\000')
1018 error (_("Junk after end of expression."));
1022 /* A post-parser that does nothing */
1025 null_post_parser (struct expression
**exp
, int void_context_p
)
1029 /* Stuff for maintaining a stack of types. Currently just used by C, but
1030 probably useful for any language which declares its types "backwards". */
1033 check_type_stack_depth (void)
1035 if (type_stack_depth
== type_stack_size
)
1037 type_stack_size
*= 2;
1038 type_stack
= (union type_stack_elt
*)
1039 xrealloc ((char *) type_stack
, type_stack_size
* sizeof (*type_stack
));
1044 push_type (enum type_pieces tp
)
1046 check_type_stack_depth ();
1047 type_stack
[type_stack_depth
++].piece
= tp
;
1051 push_type_int (int n
)
1053 check_type_stack_depth ();
1054 type_stack
[type_stack_depth
++].int_val
= n
;
1058 push_type_address_space (char *string
)
1060 push_type_int (address_space_name_to_int (string
));
1066 if (type_stack_depth
)
1067 return type_stack
[--type_stack_depth
].piece
;
1074 if (type_stack_depth
)
1075 return type_stack
[--type_stack_depth
].int_val
;
1076 /* "Can't happen". */
1080 /* Pop the type stack and return the type which corresponds to FOLLOW_TYPE
1081 as modified by all the stuff on the stack. */
1083 follow_types (struct type
*follow_type
)
1087 int make_volatile
= 0;
1088 int make_addr_space
= 0;
1090 struct type
*range_type
;
1093 switch (pop_type ())
1098 follow_type
= make_cv_type (make_const
,
1099 TYPE_VOLATILE (follow_type
),
1102 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1105 if (make_addr_space
)
1106 follow_type
= make_type_with_address_space (follow_type
,
1108 make_const
= make_volatile
= 0;
1109 make_addr_space
= 0;
1117 case tp_space_identifier
:
1118 make_addr_space
= pop_type_int ();
1121 follow_type
= lookup_pointer_type (follow_type
);
1123 follow_type
= make_cv_type (make_const
,
1124 TYPE_VOLATILE (follow_type
),
1127 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1130 if (make_addr_space
)
1131 follow_type
= make_type_with_address_space (follow_type
,
1133 make_const
= make_volatile
= 0;
1134 make_addr_space
= 0;
1137 follow_type
= lookup_reference_type (follow_type
);
1139 follow_type
= make_cv_type (make_const
,
1140 TYPE_VOLATILE (follow_type
),
1143 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1146 if (make_addr_space
)
1147 follow_type
= make_type_with_address_space (follow_type
,
1149 make_const
= make_volatile
= 0;
1150 make_addr_space
= 0;
1153 array_size
= pop_type_int ();
1154 /* FIXME-type-allocation: need a way to free this type when we are
1157 create_range_type ((struct type
*) NULL
,
1158 builtin_type_int
, 0,
1159 array_size
>= 0 ? array_size
- 1 : 0);
1161 create_array_type ((struct type
*) NULL
,
1162 follow_type
, range_type
);
1164 TYPE_ARRAY_UPPER_BOUND_TYPE (follow_type
)
1165 = BOUND_CANNOT_BE_DETERMINED
;
1168 /* FIXME-type-allocation: need a way to free this type when we are
1170 follow_type
= lookup_function_type (follow_type
);
1176 /* This function avoids direct calls to fprintf
1177 in the parser generated debug code. */
1179 parser_fprintf (FILE *x
, const char *y
, ...)
1184 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1187 fprintf_unfiltered (gdb_stderr
, " Unknown FILE used.\n");
1188 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1194 _initialize_parse (void)
1196 type_stack_size
= 80;
1197 type_stack_depth
= 0;
1198 type_stack
= (union type_stack_elt
*)
1199 xmalloc (type_stack_size
* sizeof (*type_stack
));
1201 add_setshow_zinteger_cmd ("expression", class_maintenance
,
1202 &expressiondebug
, _("\
1203 Set expression debugging."), _("\
1204 Show expression debugging."), _("\
1205 When non-zero, the internal representation of expressions will be printed."),
1207 show_expressiondebug
,
1208 &setdebuglist
, &showdebuglist
);