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, 2008
5 Free Software Foundation, Inc.
7 Modified from expread.y by the Department of Computer Science at the
8 State University of New York at Buffalo, 1991.
10 This file is part of GDB.
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 3 of the License, or
15 (at your option) any later version.
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
22 You should have received a copy of the GNU General Public License
23 along with this program. If not, see <http://www.gnu.org/licenses/>. */
25 /* Parse an expression from text in a string,
26 and return the result as a struct expression pointer.
27 That structure contains arithmetic operations in reverse polish,
28 with constants represented by operations that are followed by special data.
29 See expression.h for the details of the format.
30 What is important here is that it can be built up sequentially
31 during the process of parsing; the lower levels of the tree always
32 come first in the result. */
37 #include "gdb_string.h"
41 #include "expression.h"
46 #include "parser-defs.h"
48 #include "symfile.h" /* for overlay functions */
51 #include "gdb_assert.h"
56 /* Standard set of definitions for printing, dumping, prefixifying,
57 * and evaluating expressions. */
59 const struct exp_descriptor exp_descriptor_standard
=
61 print_subexp_standard
,
62 operator_length_standard
,
64 dump_subexp_body_standard
,
65 evaluate_subexp_standard
68 /* Global variables declared in parser-defs.h (and commented there). */
69 struct expression
*expout
;
72 struct block
*expression_context_block
;
73 CORE_ADDR expression_context_pc
;
74 struct block
*innermost_block
;
76 union type_stack_elt
*type_stack
;
77 int type_stack_depth
, type_stack_size
;
83 /* A temporary buffer for identifiers, so we can null-terminate them.
85 We allocate this with xrealloc. parse_exp_1 used to allocate with
86 alloca, using the size of the whole expression as a conservative
87 estimate of the space needed. However, macro expansion can
88 introduce names longer than the original expression; there's no
89 practical way to know beforehand how large that might be. */
93 static int expressiondebug
= 0;
95 show_expressiondebug (struct ui_file
*file
, int from_tty
,
96 struct cmd_list_element
*c
, const char *value
)
98 fprintf_filtered (file
, _("Expression debugging is %s.\n"), value
);
101 static void free_funcalls (void *ignore
);
103 static void prefixify_expression (struct expression
*);
105 static void prefixify_subexp (struct expression
*, struct expression
*, int,
108 static struct expression
*parse_exp_in_context (char **, struct block
*, int,
111 void _initialize_parse (void);
113 /* Data structure for saving values of arglist_len for function calls whose
114 arguments contain other function calls. */
118 struct funcall
*next
;
122 static struct funcall
*funcall_chain
;
124 /* Begin counting arguments for a function call,
125 saving the data about any containing call. */
132 new = (struct funcall
*) xmalloc (sizeof (struct funcall
));
133 new->next
= funcall_chain
;
134 new->arglist_len
= arglist_len
;
139 /* Return the number of arguments in a function call just terminated,
140 and restore the data for the containing function call. */
145 int val
= arglist_len
;
146 struct funcall
*call
= funcall_chain
;
147 funcall_chain
= call
->next
;
148 arglist_len
= call
->arglist_len
;
153 /* Free everything in the funcall chain.
154 Used when there is an error inside parsing. */
157 free_funcalls (void *ignore
)
159 struct funcall
*call
, *next
;
161 for (call
= funcall_chain
; call
; call
= next
)
168 /* This page contains the functions for adding data to the struct expression
169 being constructed. */
171 /* Add one element to the end of the expression. */
173 /* To avoid a bug in the Sun 4 compiler, we pass things that can fit into
174 a register through here */
177 write_exp_elt (union exp_element expelt
)
179 if (expout_ptr
>= expout_size
)
182 expout
= (struct expression
*)
183 xrealloc ((char *) expout
, sizeof (struct expression
)
184 + EXP_ELEM_TO_BYTES (expout_size
));
186 expout
->elts
[expout_ptr
++] = expelt
;
190 write_exp_elt_opcode (enum exp_opcode expelt
)
192 union exp_element tmp
;
193 memset (&tmp
, 0, sizeof (union exp_element
));
201 write_exp_elt_sym (struct symbol
*expelt
)
203 union exp_element tmp
;
204 memset (&tmp
, 0, sizeof (union exp_element
));
212 write_exp_elt_block (struct block
*b
)
214 union exp_element tmp
;
215 memset (&tmp
, 0, sizeof (union exp_element
));
221 write_exp_elt_objfile (struct objfile
*objfile
)
223 union exp_element tmp
;
224 memset (&tmp
, 0, sizeof (union exp_element
));
225 tmp
.objfile
= objfile
;
230 write_exp_elt_longcst (LONGEST expelt
)
232 union exp_element tmp
;
233 memset (&tmp
, 0, sizeof (union exp_element
));
235 tmp
.longconst
= expelt
;
241 write_exp_elt_dblcst (DOUBLEST expelt
)
243 union exp_element tmp
;
244 memset (&tmp
, 0, sizeof (union exp_element
));
246 tmp
.doubleconst
= expelt
;
252 write_exp_elt_decfloatcst (gdb_byte expelt
[16])
254 union exp_element tmp
;
257 for (index
= 0; index
< 16; index
++)
258 tmp
.decfloatconst
[index
] = expelt
[index
];
264 write_exp_elt_type (struct type
*expelt
)
266 union exp_element tmp
;
267 memset (&tmp
, 0, sizeof (union exp_element
));
275 write_exp_elt_intern (struct internalvar
*expelt
)
277 union exp_element tmp
;
278 memset (&tmp
, 0, sizeof (union exp_element
));
280 tmp
.internalvar
= expelt
;
285 /* Add a string constant to the end of the expression.
287 String constants are stored by first writing an expression element
288 that contains the length of the string, then stuffing the string
289 constant itself into however many expression elements are needed
290 to hold it, and then writing another expression element that contains
291 the length of the string. I.E. an expression element at each end of
292 the string records the string length, so you can skip over the
293 expression elements containing the actual string bytes from either
294 end of the string. Note that this also allows gdb to handle
295 strings with embedded null bytes, as is required for some languages.
297 Don't be fooled by the fact that the string is null byte terminated,
298 this is strictly for the convenience of debugging gdb itself. Gdb
299 Gdb does not depend up the string being null terminated, since the
300 actual length is recorded in expression elements at each end of the
301 string. The null byte is taken into consideration when computing how
302 many expression elements are required to hold the string constant, of
307 write_exp_string (struct stoken str
)
309 int len
= str
.length
;
313 /* Compute the number of expression elements required to hold the string
314 (including a null byte terminator), along with one expression element
315 at each end to record the actual string length (not including the
316 null byte terminator). */
318 lenelt
= 2 + BYTES_TO_EXP_ELEM (len
+ 1);
320 /* Ensure that we have enough available expression elements to store
323 if ((expout_ptr
+ lenelt
) >= expout_size
)
325 expout_size
= max (expout_size
* 2, expout_ptr
+ lenelt
+ 10);
326 expout
= (struct expression
*)
327 xrealloc ((char *) expout
, (sizeof (struct expression
)
328 + EXP_ELEM_TO_BYTES (expout_size
)));
331 /* Write the leading length expression element (which advances the current
332 expression element index), then write the string constant followed by a
333 terminating null byte, and then write the trailing length expression
336 write_exp_elt_longcst ((LONGEST
) len
);
337 strdata
= (char *) &expout
->elts
[expout_ptr
];
338 memcpy (strdata
, str
.ptr
, len
);
339 *(strdata
+ len
) = '\0';
340 expout_ptr
+= lenelt
- 2;
341 write_exp_elt_longcst ((LONGEST
) len
);
344 /* Add a bitstring constant to the end of the expression.
346 Bitstring constants are stored by first writing an expression element
347 that contains the length of the bitstring (in bits), then stuffing the
348 bitstring constant itself into however many expression elements are
349 needed to hold it, and then writing another expression element that
350 contains the length of the bitstring. I.E. an expression element at
351 each end of the bitstring records the bitstring length, so you can skip
352 over the expression elements containing the actual bitstring bytes from
353 either end of the bitstring. */
356 write_exp_bitstring (struct stoken str
)
358 int bits
= str
.length
; /* length in bits */
359 int len
= (bits
+ HOST_CHAR_BIT
- 1) / HOST_CHAR_BIT
;
363 /* Compute the number of expression elements required to hold the bitstring,
364 along with one expression element at each end to record the actual
365 bitstring length in bits. */
367 lenelt
= 2 + BYTES_TO_EXP_ELEM (len
);
369 /* Ensure that we have enough available expression elements to store
372 if ((expout_ptr
+ lenelt
) >= expout_size
)
374 expout_size
= max (expout_size
* 2, expout_ptr
+ lenelt
+ 10);
375 expout
= (struct expression
*)
376 xrealloc ((char *) expout
, (sizeof (struct expression
)
377 + EXP_ELEM_TO_BYTES (expout_size
)));
380 /* Write the leading length expression element (which advances the current
381 expression element index), then write the bitstring constant, and then
382 write the trailing length expression element. */
384 write_exp_elt_longcst ((LONGEST
) bits
);
385 strdata
= (char *) &expout
->elts
[expout_ptr
];
386 memcpy (strdata
, str
.ptr
, len
);
387 expout_ptr
+= lenelt
- 2;
388 write_exp_elt_longcst ((LONGEST
) bits
);
391 /* Add the appropriate elements for a minimal symbol to the end of
392 the expression. The rationale behind passing in text_symbol_type and
393 data_symbol_type was so that Modula-2 could pass in WORD for
394 data_symbol_type. Perhaps it still is useful to have those types vary
395 based on the language, but they no longer have names like "int", so
396 the initial rationale is gone. */
399 write_exp_msymbol (struct minimal_symbol
*msymbol
,
400 struct type
*text_symbol_type
,
401 struct type
*data_symbol_type
)
403 struct objfile
*objfile
= msymbol_objfile (msymbol
);
404 struct gdbarch
*gdbarch
= get_objfile_arch (objfile
);
406 CORE_ADDR addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
407 asection
*bfd_section
= SYMBOL_BFD_SECTION (msymbol
);
408 enum minimal_symbol_type type
= msymbol
->type
;
411 /* The minimal symbol might point to a function descriptor;
412 resolve it to the actual code address instead. */
413 pc
= gdbarch_convert_from_func_ptr_addr (gdbarch
, addr
, ¤t_target
);
416 /* In this case, assume we have a code symbol instead of
423 if (overlay_debugging
)
424 addr
= symbol_overlayed_address (addr
, bfd_section
);
426 write_exp_elt_opcode (OP_LONG
);
427 /* Let's make the type big enough to hold a 64-bit address. */
428 write_exp_elt_type (builtin_type_CORE_ADDR
);
429 write_exp_elt_longcst ((LONGEST
) addr
);
430 write_exp_elt_opcode (OP_LONG
);
432 if (bfd_section
&& bfd_section
->flags
& SEC_THREAD_LOCAL
)
434 write_exp_elt_opcode (UNOP_MEMVAL_TLS
);
435 write_exp_elt_objfile (objfile
);
436 write_exp_elt_type (builtin_type (gdbarch
)->nodebug_tls_symbol
);
437 write_exp_elt_opcode (UNOP_MEMVAL_TLS
);
441 write_exp_elt_opcode (UNOP_MEMVAL
);
446 case mst_solib_trampoline
:
447 write_exp_elt_type (builtin_type (gdbarch
)->nodebug_text_symbol
);
454 write_exp_elt_type (builtin_type (gdbarch
)->nodebug_data_symbol
);
458 write_exp_elt_type (builtin_type (gdbarch
)->nodebug_unknown_symbol
);
461 write_exp_elt_opcode (UNOP_MEMVAL
);
464 /* Recognize tokens that start with '$'. These include:
466 $regname A native register name or a "standard
469 $variable A convenience variable with a name chosen
472 $digits Value history with index <digits>, starting
473 from the first value which has index 1.
475 $$digits Value history with index <digits> relative
476 to the last value. I.E. $$0 is the last
477 value, $$1 is the one previous to that, $$2
478 is the one previous to $$1, etc.
480 $ | $0 | $$0 The last value in the value history.
482 $$ An abbreviation for the second to the last
483 value in the value history, I.E. $$1
488 write_dollar_variable (struct stoken str
)
490 struct symbol
*sym
= NULL
;
491 struct minimal_symbol
*msym
= NULL
;
492 struct internalvar
*isym
= NULL
;
494 /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1)
495 and $$digits (equivalent to $<-digits> if you could type that). */
499 /* Double dollar means negate the number and add -1 as well.
500 Thus $$ alone means -1. */
501 if (str
.length
>= 2 && str
.ptr
[1] == '$')
508 /* Just dollars (one or two) */
512 /* Is the rest of the token digits? */
513 for (; i
< str
.length
; i
++)
514 if (!(str
.ptr
[i
] >= '0' && str
.ptr
[i
] <= '9'))
518 i
= atoi (str
.ptr
+ 1 + negate
);
524 /* Handle tokens that refer to machine registers:
525 $ followed by a register name. */
526 i
= frame_map_name_to_regnum (deprecated_safe_get_selected_frame (),
527 str
.ptr
+ 1, str
.length
- 1);
529 goto handle_register
;
531 /* Any names starting with $ are probably debugger internal variables. */
533 isym
= lookup_only_internalvar (copy_name (str
) + 1);
536 write_exp_elt_opcode (OP_INTERNALVAR
);
537 write_exp_elt_intern (isym
);
538 write_exp_elt_opcode (OP_INTERNALVAR
);
542 /* On some systems, such as HP-UX and hppa-linux, certain system routines
543 have names beginning with $ or $$. Check for those, first. */
545 sym
= lookup_symbol (copy_name (str
), (struct block
*) NULL
,
546 VAR_DOMAIN
, (int *) NULL
, (struct symtab
**) NULL
);
549 write_exp_elt_opcode (OP_VAR_VALUE
);
550 write_exp_elt_block (block_found
); /* set by lookup_symbol */
551 write_exp_elt_sym (sym
);
552 write_exp_elt_opcode (OP_VAR_VALUE
);
555 msym
= lookup_minimal_symbol (copy_name (str
), NULL
, NULL
);
558 write_exp_msymbol (msym
,
559 lookup_function_type (builtin_type_int
),
564 /* Any other names are assumed to be debugger internal variables. */
566 write_exp_elt_opcode (OP_INTERNALVAR
);
567 write_exp_elt_intern (create_internalvar (copy_name (str
) + 1));
568 write_exp_elt_opcode (OP_INTERNALVAR
);
571 write_exp_elt_opcode (OP_LAST
);
572 write_exp_elt_longcst ((LONGEST
) i
);
573 write_exp_elt_opcode (OP_LAST
);
576 write_exp_elt_opcode (OP_REGISTER
);
579 write_exp_string (str
);
580 write_exp_elt_opcode (OP_REGISTER
);
586 find_template_name_end (char *p
)
589 int just_seen_right
= 0;
590 int just_seen_colon
= 0;
591 int just_seen_space
= 0;
593 if (!p
|| (*p
!= '<'))
604 /* In future, may want to allow these?? */
607 depth
++; /* start nested template */
608 if (just_seen_colon
|| just_seen_right
|| just_seen_space
)
609 return 0; /* but not after : or :: or > or space */
612 if (just_seen_colon
|| just_seen_right
)
613 return 0; /* end a (nested?) template */
614 just_seen_right
= 1; /* but not after : or :: */
615 if (--depth
== 0) /* also disallow >>, insist on > > */
616 return ++p
; /* if outermost ended, return */
619 if (just_seen_space
|| (just_seen_colon
> 1))
620 return 0; /* nested class spec coming up */
621 just_seen_colon
++; /* we allow :: but not :::: */
626 if (!((*p
>= 'a' && *p
<= 'z') || /* allow token chars */
627 (*p
>= 'A' && *p
<= 'Z') ||
628 (*p
>= '0' && *p
<= '9') ||
629 (*p
== '_') || (*p
== ',') || /* commas for template args */
630 (*p
== '&') || (*p
== '*') || /* pointer and ref types */
631 (*p
== '(') || (*p
== ')') || /* function types */
632 (*p
== '[') || (*p
== ']'))) /* array types */
647 /* Return a null-terminated temporary copy of the name
648 of a string token. */
651 copy_name (struct stoken token
)
653 /* Make sure there's enough space for the token. */
654 if (namecopy_size
< token
.length
+ 1)
656 namecopy_size
= token
.length
+ 1;
657 namecopy
= xrealloc (namecopy
, token
.length
+ 1);
660 memcpy (namecopy
, token
.ptr
, token
.length
);
661 namecopy
[token
.length
] = 0;
666 /* Reverse an expression from suffix form (in which it is constructed)
667 to prefix form (in which we can conveniently print or execute it). */
670 prefixify_expression (struct expression
*expr
)
672 int len
= sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expr
->nelts
);
673 struct expression
*temp
;
674 int inpos
= expr
->nelts
, outpos
= 0;
676 temp
= (struct expression
*) alloca (len
);
678 /* Copy the original expression into temp. */
679 memcpy (temp
, expr
, len
);
681 prefixify_subexp (temp
, expr
, inpos
, outpos
);
684 /* Return the number of exp_elements in the postfix subexpression
685 of EXPR whose operator is at index ENDPOS - 1 in EXPR. */
688 length_of_subexp (struct expression
*expr
, int endpos
)
692 operator_length (expr
, endpos
, &oplen
, &args
);
696 oplen
+= length_of_subexp (expr
, endpos
- oplen
);
703 /* Sets *OPLENP to the length of the operator whose (last) index is
704 ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that
708 operator_length (struct expression
*expr
, int endpos
, int *oplenp
, int *argsp
)
710 expr
->language_defn
->la_exp_desc
->operator_length (expr
, endpos
,
714 /* Default value for operator_length in exp_descriptor vectors. */
717 operator_length_standard (struct expression
*expr
, int endpos
,
718 int *oplenp
, int *argsp
)
722 enum f90_range_type range_type
;
726 error (_("?error in operator_length_standard"));
728 i
= (int) expr
->elts
[endpos
- 1].opcode
;
734 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
735 oplen
= 5 + BYTES_TO_EXP_ELEM (oplen
+ 1);
758 case OP_F77_UNDETERMINED_ARGLIST
:
760 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
763 case OP_OBJC_MSGCALL
: /* Objective C message (method) call */
765 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
780 case UNOP_MEMVAL_TLS
:
798 case STRUCTOP_STRUCT
:
805 case OP_OBJC_NSSTRING
: /* Objective C Foundation Class NSString constant */
806 case OP_OBJC_SELECTOR
: /* Objective C "@selector" pseudo-op */
808 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
809 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
+ 1);
813 oplen
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
814 oplen
= (oplen
+ HOST_CHAR_BIT
- 1) / HOST_CHAR_BIT
;
815 oplen
= 4 + BYTES_TO_EXP_ELEM (oplen
);
820 args
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
821 args
-= longest_to_int (expr
->elts
[endpos
- 3].longconst
);
827 case TERNOP_SLICE_COUNT
:
832 case MULTI_SUBSCRIPT
:
834 args
= 1 + longest_to_int (expr
->elts
[endpos
- 2].longconst
);
837 case BINOP_ASSIGN_MODIFY
:
851 range_type
= longest_to_int (expr
->elts
[endpos
- 2].longconst
);
854 case LOW_BOUND_DEFAULT
:
855 case HIGH_BOUND_DEFAULT
:
858 case BOTH_BOUND_DEFAULT
:
861 case NONE_BOUND_DEFAULT
:
869 args
= 1 + (i
< (int) BINOP_END
);
876 /* Copy the subexpression ending just before index INEND in INEXPR
877 into OUTEXPR, starting at index OUTBEG.
878 In the process, convert it from suffix to prefix form. */
881 prefixify_subexp (struct expression
*inexpr
,
882 struct expression
*outexpr
, int inend
, int outbeg
)
888 enum exp_opcode opcode
;
890 operator_length (inexpr
, inend
, &oplen
, &args
);
892 /* Copy the final operator itself, from the end of the input
893 to the beginning of the output. */
895 memcpy (&outexpr
->elts
[outbeg
], &inexpr
->elts
[inend
],
896 EXP_ELEM_TO_BYTES (oplen
));
899 /* Find the lengths of the arg subexpressions. */
900 arglens
= (int *) alloca (args
* sizeof (int));
901 for (i
= args
- 1; i
>= 0; i
--)
903 oplen
= length_of_subexp (inexpr
, inend
);
908 /* Now copy each subexpression, preserving the order of
909 the subexpressions, but prefixifying each one.
910 In this loop, inend starts at the beginning of
911 the expression this level is working on
912 and marches forward over the arguments.
913 outbeg does similarly in the output. */
914 for (i
= 0; i
< args
; i
++)
918 prefixify_subexp (inexpr
, outexpr
, inend
, outbeg
);
923 /* This page contains the two entry points to this file. */
925 /* Read an expression from the string *STRINGPTR points to,
926 parse it, and return a pointer to a struct expression that we malloc.
927 Use block BLOCK as the lexical context for variable names;
928 if BLOCK is zero, use the block of the selected stack frame.
929 Meanwhile, advance *STRINGPTR to point after the expression,
930 at the first nonwhite character that is not part of the expression
931 (possibly a null character).
933 If COMMA is nonzero, stop if a comma is reached. */
936 parse_exp_1 (char **stringptr
, struct block
*block
, int comma
)
938 return parse_exp_in_context (stringptr
, block
, comma
, 0);
941 /* As for parse_exp_1, except that if VOID_CONTEXT_P, then
942 no value is expected from the expression. */
944 static struct expression
*
945 parse_exp_in_context (char **stringptr
, struct block
*block
, int comma
,
948 struct cleanup
*old_chain
;
954 type_stack_depth
= 0;
956 comma_terminates
= comma
;
958 if (lexptr
== 0 || *lexptr
== 0)
959 error_no_arg (_("expression to compute"));
961 old_chain
= make_cleanup (free_funcalls
, 0 /*ignore*/);
964 expression_context_block
= block
;
966 /* If no context specified, try using the current frame, if any. */
967 if (!expression_context_block
)
968 expression_context_block
= get_selected_block (&expression_context_pc
);
970 expression_context_pc
= BLOCK_START (expression_context_block
);
972 /* Fall back to using the current source static context, if any. */
974 if (!expression_context_block
)
976 struct symtab_and_line cursal
= get_current_source_symtab_and_line ();
978 expression_context_block
979 = BLOCKVECTOR_BLOCK (BLOCKVECTOR (cursal
.symtab
), STATIC_BLOCK
);
980 if (expression_context_block
)
981 expression_context_pc
= BLOCK_START (expression_context_block
);
986 expout
= (struct expression
*)
987 xmalloc (sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expout_size
));
988 expout
->language_defn
= current_language
;
989 make_cleanup (free_current_contents
, &expout
);
991 if (current_language
->la_parser ())
992 current_language
->la_error (NULL
);
994 discard_cleanups (old_chain
);
996 /* Record the actual number of expression elements, and then
997 reallocate the expression memory so that we free up any
1000 expout
->nelts
= expout_ptr
;
1001 expout
= (struct expression
*)
1002 xrealloc ((char *) expout
,
1003 sizeof (struct expression
) + EXP_ELEM_TO_BYTES (expout_ptr
));;
1005 /* Convert expression from postfix form as generated by yacc
1006 parser, to a prefix form. */
1008 if (expressiondebug
)
1009 dump_raw_expression (expout
, gdb_stdlog
,
1010 "before conversion to prefix form");
1012 prefixify_expression (expout
);
1014 current_language
->la_post_parser (&expout
, void_context_p
);
1016 if (expressiondebug
)
1017 dump_prefix_expression (expout
, gdb_stdlog
);
1019 *stringptr
= lexptr
;
1023 /* Parse STRING as an expression, and complain if this fails
1024 to use up all of the contents of STRING. */
1027 parse_expression (char *string
)
1029 struct expression
*exp
;
1030 exp
= parse_exp_1 (&string
, 0, 0);
1032 error (_("Junk after end of expression."));
1036 /* A post-parser that does nothing */
1039 null_post_parser (struct expression
**exp
, int void_context_p
)
1043 /* Stuff for maintaining a stack of types. Currently just used by C, but
1044 probably useful for any language which declares its types "backwards". */
1047 check_type_stack_depth (void)
1049 if (type_stack_depth
== type_stack_size
)
1051 type_stack_size
*= 2;
1052 type_stack
= (union type_stack_elt
*)
1053 xrealloc ((char *) type_stack
, type_stack_size
* sizeof (*type_stack
));
1058 push_type (enum type_pieces tp
)
1060 check_type_stack_depth ();
1061 type_stack
[type_stack_depth
++].piece
= tp
;
1065 push_type_int (int n
)
1067 check_type_stack_depth ();
1068 type_stack
[type_stack_depth
++].int_val
= n
;
1072 push_type_address_space (char *string
)
1074 push_type_int (address_space_name_to_int (string
));
1080 if (type_stack_depth
)
1081 return type_stack
[--type_stack_depth
].piece
;
1088 if (type_stack_depth
)
1089 return type_stack
[--type_stack_depth
].int_val
;
1090 /* "Can't happen". */
1094 /* Pop the type stack and return the type which corresponds to FOLLOW_TYPE
1095 as modified by all the stuff on the stack. */
1097 follow_types (struct type
*follow_type
)
1101 int make_volatile
= 0;
1102 int make_addr_space
= 0;
1104 struct type
*range_type
;
1107 switch (pop_type ())
1112 follow_type
= make_cv_type (make_const
,
1113 TYPE_VOLATILE (follow_type
),
1116 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1119 if (make_addr_space
)
1120 follow_type
= make_type_with_address_space (follow_type
,
1122 make_const
= make_volatile
= 0;
1123 make_addr_space
= 0;
1131 case tp_space_identifier
:
1132 make_addr_space
= pop_type_int ();
1135 follow_type
= lookup_pointer_type (follow_type
);
1137 follow_type
= make_cv_type (make_const
,
1138 TYPE_VOLATILE (follow_type
),
1141 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1144 if (make_addr_space
)
1145 follow_type
= make_type_with_address_space (follow_type
,
1147 make_const
= make_volatile
= 0;
1148 make_addr_space
= 0;
1151 follow_type
= lookup_reference_type (follow_type
);
1153 follow_type
= make_cv_type (make_const
,
1154 TYPE_VOLATILE (follow_type
),
1157 follow_type
= make_cv_type (TYPE_CONST (follow_type
),
1160 if (make_addr_space
)
1161 follow_type
= make_type_with_address_space (follow_type
,
1163 make_const
= make_volatile
= 0;
1164 make_addr_space
= 0;
1167 array_size
= pop_type_int ();
1168 /* FIXME-type-allocation: need a way to free this type when we are
1171 create_range_type ((struct type
*) NULL
,
1172 builtin_type_int
, 0,
1173 array_size
>= 0 ? array_size
- 1 : 0);
1175 create_array_type ((struct type
*) NULL
,
1176 follow_type
, range_type
);
1178 TYPE_ARRAY_UPPER_BOUND_TYPE (follow_type
)
1179 = BOUND_CANNOT_BE_DETERMINED
;
1182 /* FIXME-type-allocation: need a way to free this type when we are
1184 follow_type
= lookup_function_type (follow_type
);
1190 /* This function avoids direct calls to fprintf
1191 in the parser generated debug code. */
1193 parser_fprintf (FILE *x
, const char *y
, ...)
1198 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1201 fprintf_unfiltered (gdb_stderr
, " Unknown FILE used.\n");
1202 vfprintf_unfiltered (gdb_stderr
, y
, args
);
1208 _initialize_parse (void)
1210 type_stack_size
= 80;
1211 type_stack_depth
= 0;
1212 type_stack
= (union type_stack_elt
*)
1213 xmalloc (type_stack_size
* sizeof (*type_stack
));
1215 add_setshow_zinteger_cmd ("expression", class_maintenance
,
1216 &expressiondebug
, _("\
1217 Set expression debugging."), _("\
1218 Show expression debugging."), _("\
1219 When non-zero, the internal representation of expressions will be printed."),
1221 show_expressiondebug
,
1222 &setdebuglist
, &showdebuglist
);