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
);
551 write_exp_elt_longcst (i
);
552 write_exp_elt_opcode (OP_REGISTER
);
558 find_template_name_end (char *p
)
561 int just_seen_right
= 0;
562 int just_seen_colon
= 0;
563 int just_seen_space
= 0;
565 if (!p
|| (*p
!= '<'))
576 /* In future, may want to allow these?? */
579 depth
++; /* start nested template */
580 if (just_seen_colon
|| just_seen_right
|| just_seen_space
)
581 return 0; /* but not after : or :: or > or space */
584 if (just_seen_colon
|| just_seen_right
)
585 return 0; /* end a (nested?) template */
586 just_seen_right
= 1; /* but not after : or :: */
587 if (--depth
== 0) /* also disallow >>, insist on > > */
588 return ++p
; /* if outermost ended, return */
591 if (just_seen_space
|| (just_seen_colon
> 1))
592 return 0; /* nested class spec coming up */
593 just_seen_colon
++; /* we allow :: but not :::: */
598 if (!((*p
>= 'a' && *p
<= 'z') || /* allow token chars */
599 (*p
>= 'A' && *p
<= 'Z') ||
600 (*p
>= '0' && *p
<= '9') ||
601 (*p
== '_') || (*p
== ',') || /* commas for template args */
602 (*p
== '&') || (*p
== '*') || /* pointer and ref types */
603 (*p
== '(') || (*p
== ')') || /* function types */
604 (*p
== '[') || (*p
== ']'))) /* array types */
619 /* Return a null-terminated temporary copy of the name
620 of a string token. */
623 copy_name (struct stoken token
)
625 /* Make sure there's enough space for the token. */
626 if (namecopy_size
< token
.length
+ 1)
628 namecopy_size
= token
.length
+ 1;
629 namecopy
= xrealloc (namecopy
, token
.length
+ 1);
632 memcpy (namecopy
, token
.ptr
, token
.length
);
633 namecopy
[token
.length
] = 0;
638 /* Reverse an expression from suffix form (in which it is constructed)
639 to prefix form (in which we can conveniently print or execute it). */
642 prefixify_expression (struct expression
*expr
)
645 sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expr
->nelts
);
646 struct expression
*temp
;
647 int inpos
= expr
->nelts
, outpos
= 0;
649 temp
= (struct expression
*) alloca (len
);
651 /* Copy the original expression into temp. */
652 memcpy (temp
, expr
, len
);
654 prefixify_subexp (temp
, expr
, inpos
, outpos
);
657 /* Return the number of exp_elements in the postfix subexpression
658 of EXPR whose operator is at index ENDPOS - 1 in EXPR. */
661 length_of_subexp (struct expression
*expr
, int endpos
)
665 operator_length (expr
, endpos
, &oplen
, &args
);
669 oplen
+= length_of_subexp (expr
, endpos
- oplen
);
676 /* Sets *OPLENP to the length of the operator whose (last) index is
677 ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that
681 operator_length (struct expression
*expr
, int endpos
, int *oplenp
, int *argsp
)
683 expr
->language_defn
->la_exp_desc
->operator_length (expr
, endpos
,
687 /* Default value for operator_length in exp_descriptor vectors. */
690 operator_length_standard (struct expression
*expr
, int endpos
,
691 int *oplenp
, int *argsp
)
695 enum f90_range_type range_type
;
699 error (_("?error in operator_length_standard"));
701 i
= (int) expr
->elts
[endpos
- 1].opcode
;
707 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
708 oplen
= 5 + BYTES_TO_EXP_ELEM (oplen
+ 1);
731 case OP_F77_UNDETERMINED_ARGLIST
:
733 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
736 case OP_OBJC_MSGCALL
: /* Objective C message (method) call */
738 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
753 case UNOP_MEMVAL_TLS
:
771 case STRUCTOP_STRUCT
:
777 case OP_OBJC_NSSTRING
: /* Objective C Foundation Class NSString constant */
778 case OP_OBJC_SELECTOR
: /* Objective C "@selector" pseudo-op */
780 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
781 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
785 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
786 oplen
= (oplen
+ HOST_CHAR_BIT
- 1) / HOST_CHAR_BIT
;
787 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
);
792 args
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
793 args
-= longest_to_int (expr
->elts
[endpos
- 3].longconst
);
799 case TERNOP_SLICE_COUNT
:
804 case MULTI_SUBSCRIPT
:
806 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
809 case BINOP_ASSIGN_MODIFY
:
823 range_type
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
826 case LOW_BOUND_DEFAULT
:
827 case HIGH_BOUND_DEFAULT
:
830 case BOTH_BOUND_DEFAULT
:
833 case NONE_BOUND_DEFAULT
:
841 args
= 1 + (i
< (int) BINOP_END
);
848 /* Copy the subexpression ending just before index INEND in INEXPR
849 into OUTEXPR, starting at index OUTBEG.
850 In the process, convert it from suffix to prefix form. */
853 prefixify_subexp (struct expression
*inexpr
,
854 struct expression
*outexpr
, int inend
, int outbeg
)
860 enum exp_opcode opcode
;
862 operator_length (inexpr
, inend
, &oplen
, &args
);
864 /* Copy the final operator itself, from the end of the input
865 to the beginning of the output. */
867 memcpy (&outexpr
->elts
[outbeg
], &inexpr
->elts
[inend
],
868 EXP_ELEM_TO_BYTES (oplen
));
871 /* Find the lengths of the arg subexpressions. */
872 arglens
= (int *) alloca (args
* sizeof (int));
873 for (i
= args
- 1; i
>= 0; i
--)
875 oplen
= length_of_subexp (inexpr
, inend
);
880 /* Now copy each subexpression, preserving the order of
881 the subexpressions, but prefixifying each one.
882 In this loop, inend starts at the beginning of
883 the expression this level is working on
884 and marches forward over the arguments.
885 outbeg does similarly in the output. */
886 for (i
= 0; i
< args
; i
++)
890 prefixify_subexp (inexpr
, outexpr
, inend
, outbeg
);
895 /* This page contains the two entry points to this file. */
897 /* Read an expression from the string *STRINGPTR points to,
898 parse it, and return a pointer to a struct expression that we malloc.
899 Use block BLOCK as the lexical context for variable names;
900 if BLOCK is zero, use the block of the selected stack frame.
901 Meanwhile, advance *STRINGPTR to point after the expression,
902 at the first nonwhite character that is not part of the expression
903 (possibly a null character).
905 If COMMA is nonzero, stop if a comma is reached. */
908 parse_exp_1 (char **stringptr
, struct block
*block
, int comma
)
910 return parse_exp_in_context (stringptr
, block
, comma
, 0);
913 /* As for parse_exp_1, except that if VOID_CONTEXT_P, then
914 no value is expected from the expression. */
916 static struct expression
*
917 parse_exp_in_context (char **stringptr
, struct block
*block
, int comma
,
920 struct cleanup
*old_chain
;
926 type_stack_depth
= 0;
928 comma_terminates
= comma
;
930 if (lexptr
== 0 || *lexptr
== 0)
931 error_no_arg (_("expression to compute"));
933 old_chain
= make_cleanup (free_funcalls
, 0 /*ignore*/);
936 /* If no context specified, try using the current frame, if any. */
939 block
= get_selected_block (&expression_context_pc
);
941 /* Fall back to using the current source static context, if any. */
945 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
947 block
= BLOCKVECTOR_BLOCK (BLOCKVECTOR (cursal
.symtab
), STATIC_BLOCK
);
950 /* Save the context, if specified by caller, or found above. */
954 expression_context_block
= block
;
955 expression_context_pc
= BLOCK_START (block
);
960 expout
= (struct expression
*)
961 xmalloc (sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expout_size
));
962 expout
->language_defn
= current_language
;
963 make_cleanup (free_current_contents
, &expout
);
965 if (current_language
->la_parser ())
966 current_language
->la_error (NULL
);
968 discard_cleanups (old_chain
);
970 /* Record the actual number of expression elements, and then
971 reallocate the expression memory so that we free up any
974 expout
->nelts
= expout_ptr
;
975 expout
= (struct expression
*)
976 xrealloc ((char *) expout
,
977 sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expout_ptr
));;
979 /* Convert expression from postfix form as generated by yacc
980 parser, to a prefix form. */
983 dump_raw_expression (expout
, gdb_stdlog
,
984 "before conversion to prefix form");
986 prefixify_expression (expout
);
988 current_language
->la_post_parser (&expout
, void_context_p
);
991 dump_prefix_expression (expout
, gdb_stdlog
);
997 /* Parse STRING as an expression, and complain if this fails
998 to use up all of the contents of STRING. */
1001 parse_expression (char *string
)
1003 struct expression
*exp
;
1004 exp
= parse_exp_1 (&string
, 0, 0);
1006 error (_("Junk after end of expression."));
1011 /* As for parse_expression, except that if VOID_CONTEXT_P, then
1012 no value is expected from the expression. */
1015 parse_expression_in_context (char *string
, int void_context_p
)
1017 struct expression
*exp
;
1018 exp
= parse_exp_in_context (&string
, 0, 0, void_context_p
);
1019 if (*string
!= '\000')
1020 error (_("Junk after end of expression."));
1024 /* A post-parser that does nothing */
1027 null_post_parser (struct expression
**exp
, int void_context_p
)
1031 /* Stuff for maintaining a stack of types. Currently just used by C, but
1032 probably useful for any language which declares its types "backwards". */
1035 check_type_stack_depth (void)
1037 if (type_stack_depth
== type_stack_size
)
1039 type_stack_size
*= 2;
1040 type_stack
= (union type_stack_elt
*)
1041 xrealloc ((char *) type_stack
, type_stack_size
* sizeof (*type_stack
));
1046 push_type (enum type_pieces tp
)
1048 check_type_stack_depth ();
1049 type_stack
[type_stack_depth
++].piece
= tp
;
1053 push_type_int (int n
)
1055 check_type_stack_depth ();
1056 type_stack
[type_stack_depth
++].int_val
= n
;
1060 push_type_address_space (char *string
)
1062 push_type_int (address_space_name_to_int (string
));
1068 if (type_stack_depth
)
1069 return type_stack
[--type_stack_depth
].piece
;
1076 if (type_stack_depth
)
1077 return type_stack
[--type_stack_depth
].int_val
;
1078 /* "Can't happen". */
1082 /* Pop the type stack and return the type which corresponds to FOLLOW_TYPE
1083 as modified by all the stuff on the stack. */
1085 follow_types (struct type
*follow_type
)
1089 int make_volatile
= 0;
1090 int make_addr_space
= 0;
1092 struct type
*range_type
;
1095 switch (pop_type ())
1100 follow_type
= make_cv_type (make_const
,
1101 TYPE_VOLATILE (follow_type
),
1104 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1107 if (make_addr_space
)
1108 follow_type
= make_type_with_address_space (follow_type
,
1110 make_const
= make_volatile
= 0;
1111 make_addr_space
= 0;
1119 case tp_space_identifier
:
1120 make_addr_space
= pop_type_int ();
1123 follow_type
= lookup_pointer_type (follow_type
);
1125 follow_type
= make_cv_type (make_const
,
1126 TYPE_VOLATILE (follow_type
),
1129 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1132 if (make_addr_space
)
1133 follow_type
= make_type_with_address_space (follow_type
,
1135 make_const
= make_volatile
= 0;
1136 make_addr_space
= 0;
1139 follow_type
= lookup_reference_type (follow_type
);
1141 follow_type
= make_cv_type (make_const
,
1142 TYPE_VOLATILE (follow_type
),
1145 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1148 if (make_addr_space
)
1149 follow_type
= make_type_with_address_space (follow_type
,
1151 make_const
= make_volatile
= 0;
1152 make_addr_space
= 0;
1155 array_size
= pop_type_int ();
1156 /* FIXME-type-allocation: need a way to free this type when we are
1159 create_range_type ((struct type
*) NULL
,
1160 builtin_type_int
, 0,
1161 array_size
>= 0 ? array_size
- 1 : 0);
1163 create_array_type ((struct type
*) NULL
,
1164 follow_type
, range_type
);
1166 TYPE_ARRAY_UPPER_BOUND_TYPE (follow_type
)
1167 = BOUND_CANNOT_BE_DETERMINED
;
1170 /* FIXME-type-allocation: need a way to free this type when we are
1172 follow_type
= lookup_function_type (follow_type
);
1178 static void build_parse (void);
1184 msym_text_symbol_type
=
1185 init_type (TYPE_CODE_FUNC
, 1, 0, "<text variable, no debug info>", NULL
);
1186 TYPE_TARGET_TYPE (msym_text_symbol_type
) = builtin_type_int
;
1187 msym_data_symbol_type
=
1188 init_type (TYPE_CODE_INT
, TARGET_INT_BIT
/ HOST_CHAR_BIT
, 0,
1189 "<data variable, no debug info>", NULL
);
1190 msym_unknown_symbol_type
=
1191 init_type (TYPE_CODE_INT
, 1, 0,
1192 "<variable (not text or data), no debug info>",
1195 msym_tls_symbol_type
=
1196 init_type (TYPE_CODE_INT
, TARGET_INT_BIT
/ HOST_CHAR_BIT
, 0,
1197 "<thread local variable, no debug info>", NULL
);
1200 /* This function avoids direct calls to fprintf
1201 in the parser generated debug code. */
1203 parser_fprintf (FILE *x
, const char *y
, ...)
1208 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1211 fprintf_unfiltered (gdb_stderr
, " Unknown FILE used.\n");
1212 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1218 _initialize_parse (void)
1220 type_stack_size
= 80;
1221 type_stack_depth
= 0;
1222 type_stack
= (union type_stack_elt
*)
1223 xmalloc (type_stack_size
* sizeof (*type_stack
));
1227 /* FIXME - For the moment, handle types by swapping them in and out.
1228 Should be using the per-architecture data-pointer and a large
1230 DEPRECATED_REGISTER_GDBARCH_SWAP (msym_text_symbol_type
);
1231 DEPRECATED_REGISTER_GDBARCH_SWAP (msym_data_symbol_type
);
1232 DEPRECATED_REGISTER_GDBARCH_SWAP (msym_unknown_symbol_type
);
1233 deprecated_register_gdbarch_swap (NULL
, 0, build_parse
);
1235 add_setshow_zinteger_cmd ("expression", class_maintenance
,
1236 &expressiondebug
, _("\
1237 Set expression debugging."), _("\
1238 Show expression debugging."), _("\
1239 When non-zero, the internal representation of expressions will be printed."),
1241 show_expressiondebug
,
1242 &setdebuglist
, &showdebuglist
);