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. */
387 static struct type
*msym_text_symbol_type
;
388 static struct type
*msym_data_symbol_type
;
389 static struct type
*msym_unknown_symbol_type
;
390 static struct type
*msym_tls_symbol_type
;
393 write_exp_msymbol (struct minimal_symbol
*msymbol
,
394 struct type
*text_symbol_type
,
395 struct type
*data_symbol_type
)
399 write_exp_elt_opcode (OP_LONG
);
400 /* Let's make the type big enough to hold a 64-bit address. */
401 write_exp_elt_type (builtin_type_CORE_ADDR
);
403 addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
404 if (overlay_debugging
)
405 addr
= symbol_overlayed_address (addr
, SYMBOL_BFD_SECTION (msymbol
));
406 write_exp_elt_longcst ((LONGEST
) addr
);
408 write_exp_elt_opcode (OP_LONG
);
410 if (SYMBOL_BFD_SECTION (msymbol
)
411 && SYMBOL_BFD_SECTION (msymbol
)->flags
& SEC_THREAD_LOCAL
)
413 bfd
*bfd
= SYMBOL_BFD_SECTION (msymbol
)->owner
;
417 if (ofp
->obfd
== bfd
)
420 write_exp_elt_opcode (UNOP_MEMVAL_TLS
);
421 write_exp_elt_objfile (ofp
);
422 write_exp_elt_type (msym_tls_symbol_type
);
423 write_exp_elt_opcode (UNOP_MEMVAL_TLS
);
427 write_exp_elt_opcode (UNOP_MEMVAL
);
428 switch (msymbol
->type
)
432 case mst_solib_trampoline
:
433 write_exp_elt_type (msym_text_symbol_type
);
440 write_exp_elt_type (msym_data_symbol_type
);
444 write_exp_elt_type (msym_unknown_symbol_type
);
447 write_exp_elt_opcode (UNOP_MEMVAL
);
450 /* Recognize tokens that start with '$'. These include:
452 $regname A native register name or a "standard
455 $variable A convenience variable with a name chosen
458 $digits Value history with index <digits>, starting
459 from the first value which has index 1.
461 $$digits Value history with index <digits> relative
462 to the last value. I.E. $$0 is the last
463 value, $$1 is the one previous to that, $$2
464 is the one previous to $$1, etc.
466 $ | $0 | $$0 The last value in the value history.
468 $$ An abbreviation for the second to the last
469 value in the value history, I.E. $$1
474 write_dollar_variable (struct stoken str
)
476 struct symbol
*sym
= NULL
;
477 struct minimal_symbol
*msym
= NULL
;
479 /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1)
480 and $$digits (equivalent to $<-digits> if you could type that). */
484 /* Double dollar means negate the number and add -1 as well.
485 Thus $$ alone means -1. */
486 if (str
.length
>= 2 && str
.ptr
[1] == '$')
493 /* Just dollars (one or two) */
497 /* Is the rest of the token digits? */
498 for (; i
< str
.length
; i
++)
499 if (!(str
.ptr
[i
] >= '0' && str
.ptr
[i
] <= '9'))
503 i
= atoi (str
.ptr
+ 1 + negate
);
509 /* Handle tokens that refer to machine registers:
510 $ followed by a register name. */
511 i
= frame_map_name_to_regnum (deprecated_safe_get_selected_frame (),
512 str
.ptr
+ 1, str
.length
- 1);
514 goto handle_register
;
516 /* On some systems, such as HP-UX and hppa-linux, certain system routines
517 have names beginning with $ or $$. Check for those, first. */
519 sym
= lookup_symbol (copy_name (str
), (struct block
*) NULL
,
520 VAR_DOMAIN
, (int *) NULL
, (struct symtab
**) NULL
);
523 write_exp_elt_opcode (OP_VAR_VALUE
);
524 write_exp_elt_block (block_found
); /* set by lookup_symbol */
525 write_exp_elt_sym (sym
);
526 write_exp_elt_opcode (OP_VAR_VALUE
);
529 msym
= lookup_minimal_symbol (copy_name (str
), NULL
, NULL
);
532 write_exp_msymbol (msym
,
533 lookup_function_type (builtin_type_int
),
538 /* Any other names starting in $ are debugger internal variables. */
540 write_exp_elt_opcode (OP_INTERNALVAR
);
541 write_exp_elt_intern (lookup_internalvar (copy_name (str
) + 1));
542 write_exp_elt_opcode (OP_INTERNALVAR
);
545 write_exp_elt_opcode (OP_LAST
);
546 write_exp_elt_longcst ((LONGEST
) i
);
547 write_exp_elt_opcode (OP_LAST
);
550 write_exp_elt_opcode (OP_REGISTER
);
553 write_exp_string (str
);
554 write_exp_elt_opcode (OP_REGISTER
);
560 find_template_name_end (char *p
)
563 int just_seen_right
= 0;
564 int just_seen_colon
= 0;
565 int just_seen_space
= 0;
567 if (!p
|| (*p
!= '<'))
578 /* In future, may want to allow these?? */
581 depth
++; /* start nested template */
582 if (just_seen_colon
|| just_seen_right
|| just_seen_space
)
583 return 0; /* but not after : or :: or > or space */
586 if (just_seen_colon
|| just_seen_right
)
587 return 0; /* end a (nested?) template */
588 just_seen_right
= 1; /* but not after : or :: */
589 if (--depth
== 0) /* also disallow >>, insist on > > */
590 return ++p
; /* if outermost ended, return */
593 if (just_seen_space
|| (just_seen_colon
> 1))
594 return 0; /* nested class spec coming up */
595 just_seen_colon
++; /* we allow :: but not :::: */
600 if (!((*p
>= 'a' && *p
<= 'z') || /* allow token chars */
601 (*p
>= 'A' && *p
<= 'Z') ||
602 (*p
>= '0' && *p
<= '9') ||
603 (*p
== '_') || (*p
== ',') || /* commas for template args */
604 (*p
== '&') || (*p
== '*') || /* pointer and ref types */
605 (*p
== '(') || (*p
== ')') || /* function types */
606 (*p
== '[') || (*p
== ']'))) /* array types */
621 /* Return a null-terminated temporary copy of the name
622 of a string token. */
625 copy_name (struct stoken token
)
627 /* Make sure there's enough space for the token. */
628 if (namecopy_size
< token
.length
+ 1)
630 namecopy_size
= token
.length
+ 1;
631 namecopy
= xrealloc (namecopy
, token
.length
+ 1);
634 memcpy (namecopy
, token
.ptr
, token
.length
);
635 namecopy
[token
.length
] = 0;
640 /* Reverse an expression from suffix form (in which it is constructed)
641 to prefix form (in which we can conveniently print or execute it). */
644 prefixify_expression (struct expression
*expr
)
647 sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expr
->nelts
);
648 struct expression
*temp
;
649 int inpos
= expr
->nelts
, outpos
= 0;
651 temp
= (struct expression
*) alloca (len
);
653 /* Copy the original expression into temp. */
654 memcpy (temp
, expr
, len
);
656 prefixify_subexp (temp
, expr
, inpos
, outpos
);
659 /* Return the number of exp_elements in the postfix subexpression
660 of EXPR whose operator is at index ENDPOS - 1 in EXPR. */
663 length_of_subexp (struct expression
*expr
, int endpos
)
667 operator_length (expr
, endpos
, &oplen
, &args
);
671 oplen
+= length_of_subexp (expr
, endpos
- oplen
);
678 /* Sets *OPLENP to the length of the operator whose (last) index is
679 ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that
683 operator_length (struct expression
*expr
, int endpos
, int *oplenp
, int *argsp
)
685 expr
->language_defn
->la_exp_desc
->operator_length (expr
, endpos
,
689 /* Default value for operator_length in exp_descriptor vectors. */
692 operator_length_standard (struct expression
*expr
, int endpos
,
693 int *oplenp
, int *argsp
)
697 enum f90_range_type range_type
;
701 error (_("?error in operator_length_standard"));
703 i
= (int) expr
->elts
[endpos
- 1].opcode
;
709 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
710 oplen
= 5 + BYTES_TO_EXP_ELEM (oplen
+ 1);
732 case OP_F77_UNDETERMINED_ARGLIST
:
734 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
737 case OP_OBJC_MSGCALL
: /* Objective C message (method) call */
739 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
754 case UNOP_MEMVAL_TLS
:
772 case STRUCTOP_STRUCT
:
779 case OP_OBJC_NSSTRING
: /* Objective C Foundation Class NSString constant */
780 case OP_OBJC_SELECTOR
: /* Objective C "@selector" pseudo-op */
782 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
783 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
787 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
788 oplen
= (oplen
+ HOST_CHAR_BIT
- 1) / HOST_CHAR_BIT
;
789 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
);
794 args
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
795 args
-= longest_to_int (expr
->elts
[endpos
- 3].longconst
);
801 case TERNOP_SLICE_COUNT
:
806 case MULTI_SUBSCRIPT
:
808 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
811 case BINOP_ASSIGN_MODIFY
:
825 range_type
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
828 case LOW_BOUND_DEFAULT
:
829 case HIGH_BOUND_DEFAULT
:
832 case BOTH_BOUND_DEFAULT
:
835 case NONE_BOUND_DEFAULT
:
843 args
= 1 + (i
< (int) BINOP_END
);
850 /* Copy the subexpression ending just before index INEND in INEXPR
851 into OUTEXPR, starting at index OUTBEG.
852 In the process, convert it from suffix to prefix form. */
855 prefixify_subexp (struct expression
*inexpr
,
856 struct expression
*outexpr
, int inend
, int outbeg
)
862 enum exp_opcode opcode
;
864 operator_length (inexpr
, inend
, &oplen
, &args
);
866 /* Copy the final operator itself, from the end of the input
867 to the beginning of the output. */
869 memcpy (&outexpr
->elts
[outbeg
], &inexpr
->elts
[inend
],
870 EXP_ELEM_TO_BYTES (oplen
));
873 /* Find the lengths of the arg subexpressions. */
874 arglens
= (int *) alloca (args
* sizeof (int));
875 for (i
= args
- 1; i
>= 0; i
--)
877 oplen
= length_of_subexp (inexpr
, inend
);
882 /* Now copy each subexpression, preserving the order of
883 the subexpressions, but prefixifying each one.
884 In this loop, inend starts at the beginning of
885 the expression this level is working on
886 and marches forward over the arguments.
887 outbeg does similarly in the output. */
888 for (i
= 0; i
< args
; i
++)
892 prefixify_subexp (inexpr
, outexpr
, inend
, outbeg
);
897 /* This page contains the two entry points to this file. */
899 /* Read an expression from the string *STRINGPTR points to,
900 parse it, and return a pointer to a struct expression that we malloc.
901 Use block BLOCK as the lexical context for variable names;
902 if BLOCK is zero, use the block of the selected stack frame.
903 Meanwhile, advance *STRINGPTR to point after the expression,
904 at the first nonwhite character that is not part of the expression
905 (possibly a null character).
907 If COMMA is nonzero, stop if a comma is reached. */
910 parse_exp_1 (char **stringptr
, struct block
*block
, int comma
)
912 return parse_exp_in_context (stringptr
, block
, comma
, 0);
915 /* As for parse_exp_1, except that if VOID_CONTEXT_P, then
916 no value is expected from the expression. */
918 static struct expression
*
919 parse_exp_in_context (char **stringptr
, struct block
*block
, int comma
,
922 struct cleanup
*old_chain
;
928 type_stack_depth
= 0;
930 comma_terminates
= comma
;
932 if (lexptr
== 0 || *lexptr
== 0)
933 error_no_arg (_("expression to compute"));
935 old_chain
= make_cleanup (free_funcalls
, 0 /*ignore*/);
938 /* If no context specified, try using the current frame, if any. */
941 block
= get_selected_block (&expression_context_pc
);
943 /* Fall back to using the current source static context, if any. */
947 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
949 block
= BLOCKVECTOR_BLOCK (BLOCKVECTOR (cursal
.symtab
), STATIC_BLOCK
);
952 /* Save the context, if specified by caller, or found above. */
956 expression_context_block
= block
;
957 expression_context_pc
= BLOCK_START (block
);
962 expout
= (struct expression
*)
963 xmalloc (sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expout_size
));
964 expout
->language_defn
= current_language
;
965 make_cleanup (free_current_contents
, &expout
);
967 if (current_language
->la_parser ())
968 current_language
->la_error (NULL
);
970 discard_cleanups (old_chain
);
972 /* Record the actual number of expression elements, and then
973 reallocate the expression memory so that we free up any
976 expout
->nelts
= expout_ptr
;
977 expout
= (struct expression
*)
978 xrealloc ((char *) expout
,
979 sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expout_ptr
));;
981 /* Convert expression from postfix form as generated by yacc
982 parser, to a prefix form. */
985 dump_raw_expression (expout
, gdb_stdlog
,
986 "before conversion to prefix form");
988 prefixify_expression (expout
);
990 current_language
->la_post_parser (&expout
, void_context_p
);
993 dump_prefix_expression (expout
, gdb_stdlog
);
999 /* Parse STRING as an expression, and complain if this fails
1000 to use up all of the contents of STRING. */
1003 parse_expression (char *string
)
1005 struct expression
*exp
;
1006 exp
= parse_exp_1 (&string
, 0, 0);
1008 error (_("Junk after end of expression."));
1013 /* As for parse_expression, except that if VOID_CONTEXT_P, then
1014 no value is expected from the expression. */
1017 parse_expression_in_context (char *string
, int void_context_p
)
1019 struct expression
*exp
;
1020 exp
= parse_exp_in_context (&string
, 0, 0, void_context_p
);
1021 if (*string
!= '\000')
1022 error (_("Junk after end of expression."));
1026 /* A post-parser that does nothing */
1029 null_post_parser (struct expression
**exp
, int void_context_p
)
1033 /* Stuff for maintaining a stack of types. Currently just used by C, but
1034 probably useful for any language which declares its types "backwards". */
1037 check_type_stack_depth (void)
1039 if (type_stack_depth
== type_stack_size
)
1041 type_stack_size
*= 2;
1042 type_stack
= (union type_stack_elt
*)
1043 xrealloc ((char *) type_stack
, type_stack_size
* sizeof (*type_stack
));
1048 push_type (enum type_pieces tp
)
1050 check_type_stack_depth ();
1051 type_stack
[type_stack_depth
++].piece
= tp
;
1055 push_type_int (int n
)
1057 check_type_stack_depth ();
1058 type_stack
[type_stack_depth
++].int_val
= n
;
1062 push_type_address_space (char *string
)
1064 push_type_int (address_space_name_to_int (string
));
1070 if (type_stack_depth
)
1071 return type_stack
[--type_stack_depth
].piece
;
1078 if (type_stack_depth
)
1079 return type_stack
[--type_stack_depth
].int_val
;
1080 /* "Can't happen". */
1084 /* Pop the type stack and return the type which corresponds to FOLLOW_TYPE
1085 as modified by all the stuff on the stack. */
1087 follow_types (struct type
*follow_type
)
1091 int make_volatile
= 0;
1092 int make_addr_space
= 0;
1094 struct type
*range_type
;
1097 switch (pop_type ())
1102 follow_type
= make_cv_type (make_const
,
1103 TYPE_VOLATILE (follow_type
),
1106 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1109 if (make_addr_space
)
1110 follow_type
= make_type_with_address_space (follow_type
,
1112 make_const
= make_volatile
= 0;
1113 make_addr_space
= 0;
1121 case tp_space_identifier
:
1122 make_addr_space
= pop_type_int ();
1125 follow_type
= lookup_pointer_type (follow_type
);
1127 follow_type
= make_cv_type (make_const
,
1128 TYPE_VOLATILE (follow_type
),
1131 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1134 if (make_addr_space
)
1135 follow_type
= make_type_with_address_space (follow_type
,
1137 make_const
= make_volatile
= 0;
1138 make_addr_space
= 0;
1141 follow_type
= lookup_reference_type (follow_type
);
1143 follow_type
= make_cv_type (make_const
,
1144 TYPE_VOLATILE (follow_type
),
1147 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1150 if (make_addr_space
)
1151 follow_type
= make_type_with_address_space (follow_type
,
1153 make_const
= make_volatile
= 0;
1154 make_addr_space
= 0;
1157 array_size
= pop_type_int ();
1158 /* FIXME-type-allocation: need a way to free this type when we are
1161 create_range_type ((struct type
*) NULL
,
1162 builtin_type_int
, 0,
1163 array_size
>= 0 ? array_size
- 1 : 0);
1165 create_array_type ((struct type
*) NULL
,
1166 follow_type
, range_type
);
1168 TYPE_ARRAY_UPPER_BOUND_TYPE (follow_type
)
1169 = BOUND_CANNOT_BE_DETERMINED
;
1172 /* FIXME-type-allocation: need a way to free this type when we are
1174 follow_type
= lookup_function_type (follow_type
);
1180 static void build_parse (void);
1186 msym_text_symbol_type
=
1187 init_type (TYPE_CODE_FUNC
, 1, 0, "<text variable, no debug info>", NULL
);
1188 TYPE_TARGET_TYPE (msym_text_symbol_type
) = builtin_type_int
;
1189 msym_data_symbol_type
=
1190 init_type (TYPE_CODE_INT
,
1191 gdbarch_int_bit (current_gdbarch
) / HOST_CHAR_BIT
, 0,
1192 "<data variable, no debug info>", NULL
);
1193 msym_unknown_symbol_type
=
1194 init_type (TYPE_CODE_INT
, 1, 0,
1195 "<variable (not text or data), no debug info>",
1198 msym_tls_symbol_type
=
1199 init_type (TYPE_CODE_INT
,
1200 gdbarch_int_bit (current_gdbarch
) / HOST_CHAR_BIT
, 0,
1201 "<thread local variable, no debug info>", NULL
);
1204 /* This function avoids direct calls to fprintf
1205 in the parser generated debug code. */
1207 parser_fprintf (FILE *x
, const char *y
, ...)
1212 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1215 fprintf_unfiltered (gdb_stderr
, " Unknown FILE used.\n");
1216 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1222 _initialize_parse (void)
1224 type_stack_size
= 80;
1225 type_stack_depth
= 0;
1226 type_stack
= (union type_stack_elt
*)
1227 xmalloc (type_stack_size
* sizeof (*type_stack
));
1231 /* FIXME - For the moment, handle types by swapping them in and out.
1232 Should be using the per-architecture data-pointer and a large
1234 DEPRECATED_REGISTER_GDBARCH_SWAP (msym_text_symbol_type
);
1235 DEPRECATED_REGISTER_GDBARCH_SWAP (msym_data_symbol_type
);
1236 DEPRECATED_REGISTER_GDBARCH_SWAP (msym_unknown_symbol_type
);
1237 deprecated_register_gdbarch_swap (NULL
, 0, build_parse
);
1239 add_setshow_zinteger_cmd ("expression", class_maintenance
,
1240 &expressiondebug
, _("\
1241 Set expression debugging."), _("\
1242 Show expression debugging."), _("\
1243 When non-zero, the internal representation of expressions will be printed."),
1245 show_expressiondebug
,
1246 &setdebuglist
, &showdebuglist
);