Commit | Line | Data |
---|---|---|
c906108c | 1 | /* Parse expressions for GDB. |
c4a172b5 | 2 | |
6aba47ca | 3 | Copyright (C) 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, |
0fb0cc75 | 4 | 1998, 1999, 2000, 2001, 2004, 2005, 2007, 2008, 2009 |
9b254dd1 | 5 | Free Software Foundation, Inc. |
c4a172b5 | 6 | |
c906108c SS |
7 | Modified from expread.y by the Department of Computer Science at the |
8 | State University of New York at Buffalo, 1991. | |
9 | ||
c5aa993b | 10 | This file is part of GDB. |
c906108c | 11 | |
c5aa993b JM |
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 | |
a9762ec7 | 14 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 15 | (at your option) any later version. |
c906108c | 16 | |
c5aa993b JM |
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. | |
c906108c | 21 | |
c5aa993b | 22 | You should have received a copy of the GNU General Public License |
a9762ec7 | 23 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
24 | |
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. */ | |
c5aa993b | 33 | |
cce74817 JM |
34 | #include <ctype.h> |
35 | ||
c906108c SS |
36 | #include "defs.h" |
37 | #include "gdb_string.h" | |
c906108c SS |
38 | #include "symtab.h" |
39 | #include "gdbtypes.h" | |
40 | #include "frame.h" | |
41 | #include "expression.h" | |
42 | #include "value.h" | |
43 | #include "command.h" | |
44 | #include "language.h" | |
0b4e1325 | 45 | #include "f-lang.h" |
c906108c SS |
46 | #include "parser-defs.h" |
47 | #include "gdbcmd.h" | |
c5aa993b | 48 | #include "symfile.h" /* for overlay functions */ |
f57d151a | 49 | #include "inferior.h" |
d16aafd8 | 50 | #include "doublest.h" |
0406ec40 | 51 | #include "gdb_assert.h" |
fe898f56 | 52 | #include "block.h" |
59f92a09 | 53 | #include "source.h" |
9e35dae4 | 54 | #include "objfiles.h" |
65d12d83 | 55 | #include "exceptions.h" |
029a67e4 | 56 | #include "user-regs.h" |
e2305d34 | 57 | |
5f9769d1 PH |
58 | /* Standard set of definitions for printing, dumping, prefixifying, |
59 | * and evaluating expressions. */ | |
60 | ||
61 | const struct exp_descriptor exp_descriptor_standard = | |
62 | { | |
63 | print_subexp_standard, | |
64 | operator_length_standard, | |
65 | op_name_standard, | |
66 | dump_subexp_body_standard, | |
67 | evaluate_subexp_standard | |
68 | }; | |
c906108c SS |
69 | \f |
70 | /* Global variables declared in parser-defs.h (and commented there). */ | |
71 | struct expression *expout; | |
72 | int expout_size; | |
73 | int expout_ptr; | |
74 | struct block *expression_context_block; | |
84f0252a | 75 | CORE_ADDR expression_context_pc; |
c906108c SS |
76 | struct block *innermost_block; |
77 | int arglist_len; | |
78 | union type_stack_elt *type_stack; | |
79 | int type_stack_depth, type_stack_size; | |
80 | char *lexptr; | |
665132f9 | 81 | char *prev_lexptr; |
c906108c SS |
82 | int paren_depth; |
83 | int comma_terminates; | |
3a913e29 | 84 | |
65d12d83 TT |
85 | /* True if parsing an expression to find a field reference. This is |
86 | only used by completion. */ | |
87 | int in_parse_field; | |
88 | ||
89 | /* The index of the last struct expression directly before a '.' or | |
90 | '->'. This is set when parsing and is only used when completing a | |
91 | field name. It is -1 if no dereference operation was found. */ | |
92 | static int expout_last_struct = -1; | |
93 | ||
3a913e29 JB |
94 | /* A temporary buffer for identifiers, so we can null-terminate them. |
95 | ||
96 | We allocate this with xrealloc. parse_exp_1 used to allocate with | |
97 | alloca, using the size of the whole expression as a conservative | |
98 | estimate of the space needed. However, macro expansion can | |
99 | introduce names longer than the original expression; there's no | |
100 | practical way to know beforehand how large that might be. */ | |
101 | char *namecopy; | |
102 | size_t namecopy_size; | |
c906108c | 103 | \f |
c906108c | 104 | static int expressiondebug = 0; |
920d2a44 AC |
105 | static void |
106 | show_expressiondebug (struct ui_file *file, int from_tty, | |
107 | struct cmd_list_element *c, const char *value) | |
108 | { | |
109 | fprintf_filtered (file, _("Expression debugging is %s.\n"), value); | |
110 | } | |
c906108c | 111 | |
74b7792f | 112 | static void free_funcalls (void *ignore); |
c906108c | 113 | |
65d12d83 | 114 | static int prefixify_expression (struct expression *); |
c906108c | 115 | |
65d12d83 TT |
116 | static int prefixify_subexp (struct expression *, struct expression *, int, |
117 | int); | |
c906108c | 118 | |
e85c3284 | 119 | static struct expression *parse_exp_in_context (char **, struct block *, int, |
65d12d83 | 120 | int, int *); |
e85c3284 | 121 | |
a14ed312 | 122 | void _initialize_parse (void); |
392a587b | 123 | |
c906108c SS |
124 | /* Data structure for saving values of arglist_len for function calls whose |
125 | arguments contain other function calls. */ | |
126 | ||
127 | struct funcall | |
128 | { | |
129 | struct funcall *next; | |
130 | int arglist_len; | |
131 | }; | |
132 | ||
133 | static struct funcall *funcall_chain; | |
134 | ||
c906108c SS |
135 | /* Begin counting arguments for a function call, |
136 | saving the data about any containing call. */ | |
137 | ||
138 | void | |
fba45db2 | 139 | start_arglist (void) |
c906108c | 140 | { |
f86f5ca3 | 141 | struct funcall *new; |
c906108c SS |
142 | |
143 | new = (struct funcall *) xmalloc (sizeof (struct funcall)); | |
144 | new->next = funcall_chain; | |
145 | new->arglist_len = arglist_len; | |
146 | arglist_len = 0; | |
147 | funcall_chain = new; | |
148 | } | |
149 | ||
150 | /* Return the number of arguments in a function call just terminated, | |
151 | and restore the data for the containing function call. */ | |
152 | ||
153 | int | |
fba45db2 | 154 | end_arglist (void) |
c906108c | 155 | { |
f86f5ca3 PH |
156 | int val = arglist_len; |
157 | struct funcall *call = funcall_chain; | |
c906108c SS |
158 | funcall_chain = call->next; |
159 | arglist_len = call->arglist_len; | |
b8c9b27d | 160 | xfree (call); |
c906108c SS |
161 | return val; |
162 | } | |
163 | ||
164 | /* Free everything in the funcall chain. | |
165 | Used when there is an error inside parsing. */ | |
166 | ||
167 | static void | |
74b7792f | 168 | free_funcalls (void *ignore) |
c906108c | 169 | { |
f86f5ca3 | 170 | struct funcall *call, *next; |
c906108c SS |
171 | |
172 | for (call = funcall_chain; call; call = next) | |
173 | { | |
174 | next = call->next; | |
b8c9b27d | 175 | xfree (call); |
c906108c SS |
176 | } |
177 | } | |
178 | \f | |
179 | /* This page contains the functions for adding data to the struct expression | |
180 | being constructed. */ | |
181 | ||
182 | /* Add one element to the end of the expression. */ | |
183 | ||
184 | /* To avoid a bug in the Sun 4 compiler, we pass things that can fit into | |
185 | a register through here */ | |
186 | ||
187 | void | |
fba45db2 | 188 | write_exp_elt (union exp_element expelt) |
c906108c SS |
189 | { |
190 | if (expout_ptr >= expout_size) | |
191 | { | |
192 | expout_size *= 2; | |
193 | expout = (struct expression *) | |
194 | xrealloc ((char *) expout, sizeof (struct expression) | |
195 | + EXP_ELEM_TO_BYTES (expout_size)); | |
196 | } | |
197 | expout->elts[expout_ptr++] = expelt; | |
198 | } | |
199 | ||
200 | void | |
fba45db2 | 201 | write_exp_elt_opcode (enum exp_opcode expelt) |
c906108c SS |
202 | { |
203 | union exp_element tmp; | |
09153d55 | 204 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
205 | |
206 | tmp.opcode = expelt; | |
207 | ||
208 | write_exp_elt (tmp); | |
209 | } | |
210 | ||
211 | void | |
fba45db2 | 212 | write_exp_elt_sym (struct symbol *expelt) |
c906108c SS |
213 | { |
214 | union exp_element tmp; | |
09153d55 | 215 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
216 | |
217 | tmp.symbol = expelt; | |
218 | ||
219 | write_exp_elt (tmp); | |
220 | } | |
221 | ||
222 | void | |
fba45db2 | 223 | write_exp_elt_block (struct block *b) |
c906108c SS |
224 | { |
225 | union exp_element tmp; | |
09153d55 | 226 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
227 | tmp.block = b; |
228 | write_exp_elt (tmp); | |
229 | } | |
230 | ||
9e35dae4 DJ |
231 | void |
232 | write_exp_elt_objfile (struct objfile *objfile) | |
233 | { | |
234 | union exp_element tmp; | |
235 | memset (&tmp, 0, sizeof (union exp_element)); | |
236 | tmp.objfile = objfile; | |
237 | write_exp_elt (tmp); | |
238 | } | |
239 | ||
c906108c | 240 | void |
fba45db2 | 241 | write_exp_elt_longcst (LONGEST expelt) |
c906108c SS |
242 | { |
243 | union exp_element tmp; | |
09153d55 | 244 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
245 | |
246 | tmp.longconst = expelt; | |
247 | ||
248 | write_exp_elt (tmp); | |
249 | } | |
250 | ||
251 | void | |
fba45db2 | 252 | write_exp_elt_dblcst (DOUBLEST expelt) |
c906108c SS |
253 | { |
254 | union exp_element tmp; | |
09153d55 | 255 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
256 | |
257 | tmp.doubleconst = expelt; | |
258 | ||
259 | write_exp_elt (tmp); | |
260 | } | |
261 | ||
27bc4d80 TJB |
262 | void |
263 | write_exp_elt_decfloatcst (gdb_byte expelt[16]) | |
264 | { | |
265 | union exp_element tmp; | |
266 | int index; | |
267 | ||
268 | for (index = 0; index < 16; index++) | |
269 | tmp.decfloatconst[index] = expelt[index]; | |
270 | ||
271 | write_exp_elt (tmp); | |
272 | } | |
273 | ||
c906108c | 274 | void |
fba45db2 | 275 | write_exp_elt_type (struct type *expelt) |
c906108c SS |
276 | { |
277 | union exp_element tmp; | |
09153d55 | 278 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
279 | |
280 | tmp.type = expelt; | |
281 | ||
282 | write_exp_elt (tmp); | |
283 | } | |
284 | ||
285 | void | |
fba45db2 | 286 | write_exp_elt_intern (struct internalvar *expelt) |
c906108c SS |
287 | { |
288 | union exp_element tmp; | |
09153d55 | 289 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
290 | |
291 | tmp.internalvar = expelt; | |
292 | ||
293 | write_exp_elt (tmp); | |
294 | } | |
295 | ||
296 | /* Add a string constant to the end of the expression. | |
297 | ||
298 | String constants are stored by first writing an expression element | |
299 | that contains the length of the string, then stuffing the string | |
300 | constant itself into however many expression elements are needed | |
301 | to hold it, and then writing another expression element that contains | |
302 | the length of the string. I.E. an expression element at each end of | |
303 | the string records the string length, so you can skip over the | |
304 | expression elements containing the actual string bytes from either | |
305 | end of the string. Note that this also allows gdb to handle | |
306 | strings with embedded null bytes, as is required for some languages. | |
307 | ||
308 | Don't be fooled by the fact that the string is null byte terminated, | |
309 | this is strictly for the convenience of debugging gdb itself. Gdb | |
310 | Gdb does not depend up the string being null terminated, since the | |
311 | actual length is recorded in expression elements at each end of the | |
312 | string. The null byte is taken into consideration when computing how | |
313 | many expression elements are required to hold the string constant, of | |
314 | course. */ | |
315 | ||
316 | ||
317 | void | |
fba45db2 | 318 | write_exp_string (struct stoken str) |
c906108c | 319 | { |
f86f5ca3 PH |
320 | int len = str.length; |
321 | int lenelt; | |
322 | char *strdata; | |
c906108c SS |
323 | |
324 | /* Compute the number of expression elements required to hold the string | |
325 | (including a null byte terminator), along with one expression element | |
326 | at each end to record the actual string length (not including the | |
327 | null byte terminator). */ | |
328 | ||
329 | lenelt = 2 + BYTES_TO_EXP_ELEM (len + 1); | |
330 | ||
331 | /* Ensure that we have enough available expression elements to store | |
332 | everything. */ | |
333 | ||
334 | if ((expout_ptr + lenelt) >= expout_size) | |
335 | { | |
336 | expout_size = max (expout_size * 2, expout_ptr + lenelt + 10); | |
337 | expout = (struct expression *) | |
338 | xrealloc ((char *) expout, (sizeof (struct expression) | |
339 | + EXP_ELEM_TO_BYTES (expout_size))); | |
340 | } | |
341 | ||
342 | /* Write the leading length expression element (which advances the current | |
343 | expression element index), then write the string constant followed by a | |
344 | terminating null byte, and then write the trailing length expression | |
345 | element. */ | |
346 | ||
347 | write_exp_elt_longcst ((LONGEST) len); | |
348 | strdata = (char *) &expout->elts[expout_ptr]; | |
349 | memcpy (strdata, str.ptr, len); | |
350 | *(strdata + len) = '\0'; | |
351 | expout_ptr += lenelt - 2; | |
352 | write_exp_elt_longcst ((LONGEST) len); | |
353 | } | |
354 | ||
355 | /* Add a bitstring constant to the end of the expression. | |
356 | ||
357 | Bitstring constants are stored by first writing an expression element | |
358 | that contains the length of the bitstring (in bits), then stuffing the | |
359 | bitstring constant itself into however many expression elements are | |
360 | needed to hold it, and then writing another expression element that | |
361 | contains the length of the bitstring. I.E. an expression element at | |
362 | each end of the bitstring records the bitstring length, so you can skip | |
363 | over the expression elements containing the actual bitstring bytes from | |
364 | either end of the bitstring. */ | |
365 | ||
366 | void | |
fba45db2 | 367 | write_exp_bitstring (struct stoken str) |
c906108c | 368 | { |
f86f5ca3 PH |
369 | int bits = str.length; /* length in bits */ |
370 | int len = (bits + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; | |
371 | int lenelt; | |
372 | char *strdata; | |
c906108c SS |
373 | |
374 | /* Compute the number of expression elements required to hold the bitstring, | |
375 | along with one expression element at each end to record the actual | |
376 | bitstring length in bits. */ | |
377 | ||
378 | lenelt = 2 + BYTES_TO_EXP_ELEM (len); | |
379 | ||
380 | /* Ensure that we have enough available expression elements to store | |
381 | everything. */ | |
382 | ||
383 | if ((expout_ptr + lenelt) >= expout_size) | |
384 | { | |
385 | expout_size = max (expout_size * 2, expout_ptr + lenelt + 10); | |
386 | expout = (struct expression *) | |
387 | xrealloc ((char *) expout, (sizeof (struct expression) | |
388 | + EXP_ELEM_TO_BYTES (expout_size))); | |
389 | } | |
390 | ||
391 | /* Write the leading length expression element (which advances the current | |
392 | expression element index), then write the bitstring constant, and then | |
393 | write the trailing length expression element. */ | |
394 | ||
395 | write_exp_elt_longcst ((LONGEST) bits); | |
396 | strdata = (char *) &expout->elts[expout_ptr]; | |
397 | memcpy (strdata, str.ptr, len); | |
398 | expout_ptr += lenelt - 2; | |
399 | write_exp_elt_longcst ((LONGEST) bits); | |
400 | } | |
401 | ||
402 | /* Add the appropriate elements for a minimal symbol to the end of | |
c841afd5 | 403 | the expression. */ |
c906108c | 404 | |
c906108c | 405 | void |
c841afd5 | 406 | write_exp_msymbol (struct minimal_symbol *msymbol) |
c906108c | 407 | { |
bccdca4a UW |
408 | struct objfile *objfile = msymbol_objfile (msymbol); |
409 | struct gdbarch *gdbarch = get_objfile_arch (objfile); | |
410 | ||
411 | CORE_ADDR addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
714835d5 | 412 | struct obj_section *section = SYMBOL_OBJ_SECTION (msymbol); |
712f90be | 413 | enum minimal_symbol_type type = MSYMBOL_TYPE (msymbol); |
bccdca4a UW |
414 | CORE_ADDR pc; |
415 | ||
416 | /* The minimal symbol might point to a function descriptor; | |
417 | resolve it to the actual code address instead. */ | |
418 | pc = gdbarch_convert_from_func_ptr_addr (gdbarch, addr, ¤t_target); | |
419 | if (pc != addr) | |
420 | { | |
421 | /* In this case, assume we have a code symbol instead of | |
422 | a data symbol. */ | |
423 | type = mst_text; | |
714835d5 | 424 | section = NULL; |
bccdca4a UW |
425 | addr = pc; |
426 | } | |
427 | ||
428 | if (overlay_debugging) | |
714835d5 | 429 | addr = symbol_overlayed_address (addr, section); |
c906108c SS |
430 | |
431 | write_exp_elt_opcode (OP_LONG); | |
a858089e | 432 | /* Let's make the type big enough to hold a 64-bit address. */ |
c841afd5 | 433 | write_exp_elt_type (builtin_type (gdbarch)->builtin_core_addr); |
c906108c | 434 | write_exp_elt_longcst ((LONGEST) addr); |
c906108c SS |
435 | write_exp_elt_opcode (OP_LONG); |
436 | ||
714835d5 | 437 | if (section && section->the_bfd_section->flags & SEC_THREAD_LOCAL) |
9e35dae4 | 438 | { |
9e35dae4 | 439 | write_exp_elt_opcode (UNOP_MEMVAL_TLS); |
bccdca4a | 440 | write_exp_elt_objfile (objfile); |
64c50499 | 441 | write_exp_elt_type (builtin_type (gdbarch)->nodebug_tls_symbol); |
9e35dae4 DJ |
442 | write_exp_elt_opcode (UNOP_MEMVAL_TLS); |
443 | return; | |
444 | } | |
445 | ||
c906108c | 446 | write_exp_elt_opcode (UNOP_MEMVAL); |
bccdca4a | 447 | switch (type) |
c906108c SS |
448 | { |
449 | case mst_text: | |
450 | case mst_file_text: | |
451 | case mst_solib_trampoline: | |
64c50499 | 452 | write_exp_elt_type (builtin_type (gdbarch)->nodebug_text_symbol); |
c906108c SS |
453 | break; |
454 | ||
455 | case mst_data: | |
456 | case mst_file_data: | |
457 | case mst_bss: | |
458 | case mst_file_bss: | |
64c50499 | 459 | write_exp_elt_type (builtin_type (gdbarch)->nodebug_data_symbol); |
c906108c SS |
460 | break; |
461 | ||
462 | default: | |
64c50499 | 463 | write_exp_elt_type (builtin_type (gdbarch)->nodebug_unknown_symbol); |
c906108c SS |
464 | break; |
465 | } | |
466 | write_exp_elt_opcode (UNOP_MEMVAL); | |
467 | } | |
65d12d83 TT |
468 | |
469 | /* Mark the current index as the starting location of a structure | |
470 | expression. This is used when completing on field names. */ | |
471 | ||
472 | void | |
473 | mark_struct_expression (void) | |
474 | { | |
475 | expout_last_struct = expout_ptr; | |
476 | } | |
477 | ||
c906108c SS |
478 | \f |
479 | /* Recognize tokens that start with '$'. These include: | |
480 | ||
c5aa993b JM |
481 | $regname A native register name or a "standard |
482 | register name". | |
c906108c | 483 | |
c5aa993b JM |
484 | $variable A convenience variable with a name chosen |
485 | by the user. | |
c906108c | 486 | |
c5aa993b JM |
487 | $digits Value history with index <digits>, starting |
488 | from the first value which has index 1. | |
c906108c | 489 | |
c5aa993b JM |
490 | $$digits Value history with index <digits> relative |
491 | to the last value. I.E. $$0 is the last | |
492 | value, $$1 is the one previous to that, $$2 | |
493 | is the one previous to $$1, etc. | |
c906108c | 494 | |
c5aa993b | 495 | $ | $0 | $$0 The last value in the value history. |
c906108c | 496 | |
c5aa993b JM |
497 | $$ An abbreviation for the second to the last |
498 | value in the value history, I.E. $$1 | |
c906108c | 499 | |
c5aa993b | 500 | */ |
c906108c SS |
501 | |
502 | void | |
fba45db2 | 503 | write_dollar_variable (struct stoken str) |
c906108c | 504 | { |
d7318818 RC |
505 | struct symbol *sym = NULL; |
506 | struct minimal_symbol *msym = NULL; | |
c4a3d09a | 507 | struct internalvar *isym = NULL; |
d7318818 | 508 | |
c906108c SS |
509 | /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1) |
510 | and $$digits (equivalent to $<-digits> if you could type that). */ | |
511 | ||
c906108c SS |
512 | int negate = 0; |
513 | int i = 1; | |
514 | /* Double dollar means negate the number and add -1 as well. | |
515 | Thus $$ alone means -1. */ | |
516 | if (str.length >= 2 && str.ptr[1] == '$') | |
517 | { | |
518 | negate = 1; | |
519 | i = 2; | |
520 | } | |
521 | if (i == str.length) | |
522 | { | |
523 | /* Just dollars (one or two) */ | |
c5aa993b | 524 | i = -negate; |
c906108c SS |
525 | goto handle_last; |
526 | } | |
527 | /* Is the rest of the token digits? */ | |
528 | for (; i < str.length; i++) | |
529 | if (!(str.ptr[i] >= '0' && str.ptr[i] <= '9')) | |
530 | break; | |
531 | if (i == str.length) | |
532 | { | |
533 | i = atoi (str.ptr + 1 + negate); | |
534 | if (negate) | |
c5aa993b | 535 | i = -i; |
c906108c SS |
536 | goto handle_last; |
537 | } | |
c5aa993b | 538 | |
c906108c SS |
539 | /* Handle tokens that refer to machine registers: |
540 | $ followed by a register name. */ | |
029a67e4 UW |
541 | i = user_reg_map_name_to_regnum (current_gdbarch, |
542 | str.ptr + 1, str.length - 1); | |
c5aa993b | 543 | if (i >= 0) |
c906108c SS |
544 | goto handle_register; |
545 | ||
c4a3d09a MF |
546 | /* Any names starting with $ are probably debugger internal variables. */ |
547 | ||
548 | isym = lookup_only_internalvar (copy_name (str) + 1); | |
549 | if (isym) | |
550 | { | |
551 | write_exp_elt_opcode (OP_INTERNALVAR); | |
552 | write_exp_elt_intern (isym); | |
553 | write_exp_elt_opcode (OP_INTERNALVAR); | |
554 | return; | |
555 | } | |
556 | ||
d7318818 RC |
557 | /* On some systems, such as HP-UX and hppa-linux, certain system routines |
558 | have names beginning with $ or $$. Check for those, first. */ | |
559 | ||
560 | sym = lookup_symbol (copy_name (str), (struct block *) NULL, | |
2570f2b7 | 561 | VAR_DOMAIN, (int *) NULL); |
d7318818 RC |
562 | if (sym) |
563 | { | |
564 | write_exp_elt_opcode (OP_VAR_VALUE); | |
565 | write_exp_elt_block (block_found); /* set by lookup_symbol */ | |
566 | write_exp_elt_sym (sym); | |
567 | write_exp_elt_opcode (OP_VAR_VALUE); | |
568 | return; | |
569 | } | |
570 | msym = lookup_minimal_symbol (copy_name (str), NULL, NULL); | |
571 | if (msym) | |
c906108c | 572 | { |
c841afd5 | 573 | write_exp_msymbol (msym); |
d7318818 | 574 | return; |
c906108c | 575 | } |
c5aa993b | 576 | |
c4a3d09a | 577 | /* Any other names are assumed to be debugger internal variables. */ |
c906108c SS |
578 | |
579 | write_exp_elt_opcode (OP_INTERNALVAR); | |
c4a3d09a | 580 | write_exp_elt_intern (create_internalvar (copy_name (str) + 1)); |
c5aa993b | 581 | write_exp_elt_opcode (OP_INTERNALVAR); |
c906108c | 582 | return; |
c5aa993b | 583 | handle_last: |
c906108c SS |
584 | write_exp_elt_opcode (OP_LAST); |
585 | write_exp_elt_longcst ((LONGEST) i); | |
586 | write_exp_elt_opcode (OP_LAST); | |
587 | return; | |
c5aa993b | 588 | handle_register: |
c906108c | 589 | write_exp_elt_opcode (OP_REGISTER); |
67f3407f DJ |
590 | str.length--; |
591 | str.ptr++; | |
592 | write_exp_string (str); | |
c5aa993b | 593 | write_exp_elt_opcode (OP_REGISTER); |
c906108c SS |
594 | return; |
595 | } | |
596 | ||
597 | ||
c906108c | 598 | char * |
fba45db2 | 599 | find_template_name_end (char *p) |
c906108c SS |
600 | { |
601 | int depth = 1; | |
602 | int just_seen_right = 0; | |
603 | int just_seen_colon = 0; | |
604 | int just_seen_space = 0; | |
c5aa993b | 605 | |
c906108c SS |
606 | if (!p || (*p != '<')) |
607 | return 0; | |
608 | ||
609 | while (*++p) | |
610 | { | |
611 | switch (*p) | |
c5aa993b JM |
612 | { |
613 | case '\'': | |
614 | case '\"': | |
615 | case '{': | |
616 | case '}': | |
617 | /* In future, may want to allow these?? */ | |
618 | return 0; | |
619 | case '<': | |
620 | depth++; /* start nested template */ | |
621 | if (just_seen_colon || just_seen_right || just_seen_space) | |
622 | return 0; /* but not after : or :: or > or space */ | |
623 | break; | |
624 | case '>': | |
625 | if (just_seen_colon || just_seen_right) | |
626 | return 0; /* end a (nested?) template */ | |
627 | just_seen_right = 1; /* but not after : or :: */ | |
628 | if (--depth == 0) /* also disallow >>, insist on > > */ | |
629 | return ++p; /* if outermost ended, return */ | |
630 | break; | |
631 | case ':': | |
632 | if (just_seen_space || (just_seen_colon > 1)) | |
633 | return 0; /* nested class spec coming up */ | |
634 | just_seen_colon++; /* we allow :: but not :::: */ | |
635 | break; | |
636 | case ' ': | |
637 | break; | |
638 | default: | |
639 | if (!((*p >= 'a' && *p <= 'z') || /* allow token chars */ | |
640 | (*p >= 'A' && *p <= 'Z') || | |
641 | (*p >= '0' && *p <= '9') || | |
642 | (*p == '_') || (*p == ',') || /* commas for template args */ | |
643 | (*p == '&') || (*p == '*') || /* pointer and ref types */ | |
644 | (*p == '(') || (*p == ')') || /* function types */ | |
645 | (*p == '[') || (*p == ']'))) /* array types */ | |
646 | return 0; | |
647 | } | |
c906108c | 648 | if (*p != ' ') |
c5aa993b | 649 | just_seen_space = 0; |
c906108c | 650 | if (*p != ':') |
c5aa993b | 651 | just_seen_colon = 0; |
c906108c | 652 | if (*p != '>') |
c5aa993b | 653 | just_seen_right = 0; |
c906108c SS |
654 | } |
655 | return 0; | |
656 | } | |
c5aa993b | 657 | \f |
c906108c SS |
658 | |
659 | ||
c906108c SS |
660 | /* Return a null-terminated temporary copy of the name |
661 | of a string token. */ | |
662 | ||
663 | char * | |
fba45db2 | 664 | copy_name (struct stoken token) |
c906108c | 665 | { |
3a913e29 JB |
666 | /* Make sure there's enough space for the token. */ |
667 | if (namecopy_size < token.length + 1) | |
668 | { | |
669 | namecopy_size = token.length + 1; | |
670 | namecopy = xrealloc (namecopy, token.length + 1); | |
671 | } | |
672 | ||
c906108c SS |
673 | memcpy (namecopy, token.ptr, token.length); |
674 | namecopy[token.length] = 0; | |
3a913e29 | 675 | |
c906108c SS |
676 | return namecopy; |
677 | } | |
678 | \f | |
679 | /* Reverse an expression from suffix form (in which it is constructed) | |
65d12d83 TT |
680 | to prefix form (in which we can conveniently print or execute it). |
681 | Ordinarily this always returns -1. However, if EXPOUT_LAST_STRUCT | |
682 | is not -1 (i.e., we are trying to complete a field name), it will | |
683 | return the index of the subexpression which is the left-hand-side | |
684 | of the struct operation at EXPOUT_LAST_STRUCT. */ | |
c906108c | 685 | |
65d12d83 | 686 | static int |
f86f5ca3 | 687 | prefixify_expression (struct expression *expr) |
c906108c | 688 | { |
df2a60d0 | 689 | int len = sizeof (struct expression) + EXP_ELEM_TO_BYTES (expr->nelts); |
f86f5ca3 PH |
690 | struct expression *temp; |
691 | int inpos = expr->nelts, outpos = 0; | |
c906108c SS |
692 | |
693 | temp = (struct expression *) alloca (len); | |
694 | ||
695 | /* Copy the original expression into temp. */ | |
696 | memcpy (temp, expr, len); | |
697 | ||
65d12d83 | 698 | return prefixify_subexp (temp, expr, inpos, outpos); |
c906108c SS |
699 | } |
700 | ||
24daaebc PH |
701 | /* Return the number of exp_elements in the postfix subexpression |
702 | of EXPR whose operator is at index ENDPOS - 1 in EXPR. */ | |
c906108c SS |
703 | |
704 | int | |
f86f5ca3 | 705 | length_of_subexp (struct expression *expr, int endpos) |
24daaebc PH |
706 | { |
707 | int oplen, args, i; | |
708 | ||
709 | operator_length (expr, endpos, &oplen, &args); | |
710 | ||
711 | while (args > 0) | |
712 | { | |
713 | oplen += length_of_subexp (expr, endpos - oplen); | |
714 | args--; | |
715 | } | |
716 | ||
717 | return oplen; | |
718 | } | |
719 | ||
720 | /* Sets *OPLENP to the length of the operator whose (last) index is | |
721 | ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that | |
722 | operator takes. */ | |
723 | ||
724 | void | |
725 | operator_length (struct expression *expr, int endpos, int *oplenp, int *argsp) | |
5f9769d1 PH |
726 | { |
727 | expr->language_defn->la_exp_desc->operator_length (expr, endpos, | |
728 | oplenp, argsp); | |
729 | } | |
730 | ||
731 | /* Default value for operator_length in exp_descriptor vectors. */ | |
732 | ||
733 | void | |
734 | operator_length_standard (struct expression *expr, int endpos, | |
735 | int *oplenp, int *argsp) | |
c906108c | 736 | { |
f86f5ca3 PH |
737 | int oplen = 1; |
738 | int args = 0; | |
0b4e1325 | 739 | enum f90_range_type range_type; |
f86f5ca3 | 740 | int i; |
c906108c SS |
741 | |
742 | if (endpos < 1) | |
8a3fe4f8 | 743 | error (_("?error in operator_length_standard")); |
c906108c SS |
744 | |
745 | i = (int) expr->elts[endpos - 1].opcode; | |
746 | ||
747 | switch (i) | |
748 | { | |
749 | /* C++ */ | |
750 | case OP_SCOPE: | |
751 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); | |
752 | oplen = 5 + BYTES_TO_EXP_ELEM (oplen + 1); | |
753 | break; | |
754 | ||
755 | case OP_LONG: | |
756 | case OP_DOUBLE: | |
27bc4d80 | 757 | case OP_DECFLOAT: |
c906108c SS |
758 | case OP_VAR_VALUE: |
759 | oplen = 4; | |
760 | break; | |
761 | ||
762 | case OP_TYPE: | |
763 | case OP_BOOL: | |
764 | case OP_LAST: | |
c906108c SS |
765 | case OP_INTERNALVAR: |
766 | oplen = 3; | |
767 | break; | |
768 | ||
769 | case OP_COMPLEX: | |
c806c55a | 770 | oplen = 3; |
c906108c | 771 | args = 2; |
c5aa993b | 772 | break; |
c906108c SS |
773 | |
774 | case OP_FUNCALL: | |
775 | case OP_F77_UNDETERMINED_ARGLIST: | |
776 | oplen = 3; | |
777 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); | |
778 | break; | |
779 | ||
646df18d | 780 | case OP_OBJC_MSGCALL: /* Objective C message (method) call */ |
53c551b7 AF |
781 | oplen = 4; |
782 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); | |
783 | break; | |
784 | ||
c906108c SS |
785 | case UNOP_MAX: |
786 | case UNOP_MIN: | |
787 | oplen = 3; | |
788 | break; | |
789 | ||
c5aa993b JM |
790 | case BINOP_VAL: |
791 | case UNOP_CAST: | |
792 | case UNOP_MEMVAL: | |
c906108c SS |
793 | oplen = 3; |
794 | args = 1; | |
795 | break; | |
796 | ||
9e35dae4 DJ |
797 | case UNOP_MEMVAL_TLS: |
798 | oplen = 4; | |
799 | args = 1; | |
800 | break; | |
801 | ||
c906108c SS |
802 | case UNOP_ABS: |
803 | case UNOP_CAP: | |
804 | case UNOP_CHR: | |
805 | case UNOP_FLOAT: | |
806 | case UNOP_HIGH: | |
807 | case UNOP_ODD: | |
808 | case UNOP_ORD: | |
809 | case UNOP_TRUNC: | |
810 | oplen = 1; | |
811 | args = 1; | |
812 | break; | |
813 | ||
814 | case OP_LABELED: | |
815 | case STRUCTOP_STRUCT: | |
816 | case STRUCTOP_PTR: | |
817 | args = 1; | |
818 | /* fall through */ | |
67f3407f | 819 | case OP_REGISTER: |
c906108c SS |
820 | case OP_M2_STRING: |
821 | case OP_STRING: | |
646df18d AF |
822 | case OP_OBJC_NSSTRING: /* Objective C Foundation Class NSString constant */ |
823 | case OP_OBJC_SELECTOR: /* Objective C "@selector" pseudo-op */ | |
c906108c | 824 | case OP_NAME: |
c906108c SS |
825 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); |
826 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1); | |
827 | break; | |
828 | ||
829 | case OP_BITSTRING: | |
830 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); | |
831 | oplen = (oplen + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; | |
832 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen); | |
833 | break; | |
834 | ||
835 | case OP_ARRAY: | |
836 | oplen = 4; | |
837 | args = longest_to_int (expr->elts[endpos - 2].longconst); | |
838 | args -= longest_to_int (expr->elts[endpos - 3].longconst); | |
839 | args += 1; | |
840 | break; | |
841 | ||
842 | case TERNOP_COND: | |
843 | case TERNOP_SLICE: | |
844 | case TERNOP_SLICE_COUNT: | |
845 | args = 3; | |
846 | break; | |
847 | ||
848 | /* Modula-2 */ | |
c5aa993b | 849 | case MULTI_SUBSCRIPT: |
c906108c | 850 | oplen = 3; |
c5aa993b | 851 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); |
c906108c SS |
852 | break; |
853 | ||
854 | case BINOP_ASSIGN_MODIFY: | |
855 | oplen = 3; | |
856 | args = 2; | |
857 | break; | |
858 | ||
859 | /* C++ */ | |
860 | case OP_THIS: | |
646df18d | 861 | case OP_OBJC_SELF: |
c906108c SS |
862 | oplen = 2; |
863 | break; | |
864 | ||
0b4e1325 WZ |
865 | case OP_F90_RANGE: |
866 | oplen = 3; | |
867 | ||
868 | range_type = longest_to_int (expr->elts[endpos - 2].longconst); | |
869 | switch (range_type) | |
870 | { | |
871 | case LOW_BOUND_DEFAULT: | |
872 | case HIGH_BOUND_DEFAULT: | |
873 | args = 1; | |
874 | break; | |
875 | case BOTH_BOUND_DEFAULT: | |
876 | args = 0; | |
877 | break; | |
878 | case NONE_BOUND_DEFAULT: | |
879 | args = 2; | |
880 | break; | |
881 | } | |
882 | ||
883 | break; | |
884 | ||
c906108c SS |
885 | default: |
886 | args = 1 + (i < (int) BINOP_END); | |
887 | } | |
888 | ||
24daaebc PH |
889 | *oplenp = oplen; |
890 | *argsp = args; | |
c906108c SS |
891 | } |
892 | ||
893 | /* Copy the subexpression ending just before index INEND in INEXPR | |
894 | into OUTEXPR, starting at index OUTBEG. | |
65d12d83 TT |
895 | In the process, convert it from suffix to prefix form. |
896 | If EXPOUT_LAST_STRUCT is -1, then this function always returns -1. | |
897 | Otherwise, it returns the index of the subexpression which is the | |
898 | left-hand-side of the expression at EXPOUT_LAST_STRUCT. */ | |
c906108c | 899 | |
65d12d83 | 900 | static int |
f86f5ca3 PH |
901 | prefixify_subexp (struct expression *inexpr, |
902 | struct expression *outexpr, int inend, int outbeg) | |
c906108c | 903 | { |
24daaebc PH |
904 | int oplen; |
905 | int args; | |
f86f5ca3 | 906 | int i; |
c906108c SS |
907 | int *arglens; |
908 | enum exp_opcode opcode; | |
65d12d83 | 909 | int result = -1; |
c906108c | 910 | |
24daaebc | 911 | operator_length (inexpr, inend, &oplen, &args); |
c906108c SS |
912 | |
913 | /* Copy the final operator itself, from the end of the input | |
914 | to the beginning of the output. */ | |
915 | inend -= oplen; | |
916 | memcpy (&outexpr->elts[outbeg], &inexpr->elts[inend], | |
917 | EXP_ELEM_TO_BYTES (oplen)); | |
918 | outbeg += oplen; | |
919 | ||
65d12d83 TT |
920 | if (expout_last_struct == inend) |
921 | result = outbeg - oplen; | |
922 | ||
c906108c SS |
923 | /* Find the lengths of the arg subexpressions. */ |
924 | arglens = (int *) alloca (args * sizeof (int)); | |
925 | for (i = args - 1; i >= 0; i--) | |
926 | { | |
927 | oplen = length_of_subexp (inexpr, inend); | |
928 | arglens[i] = oplen; | |
929 | inend -= oplen; | |
930 | } | |
931 | ||
932 | /* Now copy each subexpression, preserving the order of | |
933 | the subexpressions, but prefixifying each one. | |
934 | In this loop, inend starts at the beginning of | |
935 | the expression this level is working on | |
936 | and marches forward over the arguments. | |
937 | outbeg does similarly in the output. */ | |
938 | for (i = 0; i < args; i++) | |
939 | { | |
65d12d83 | 940 | int r; |
c906108c SS |
941 | oplen = arglens[i]; |
942 | inend += oplen; | |
65d12d83 TT |
943 | r = prefixify_subexp (inexpr, outexpr, inend, outbeg); |
944 | if (r != -1) | |
945 | { | |
946 | /* Return immediately. We probably have only parsed a | |
947 | partial expression, so we don't want to try to reverse | |
948 | the other operands. */ | |
949 | return r; | |
950 | } | |
c906108c SS |
951 | outbeg += oplen; |
952 | } | |
65d12d83 TT |
953 | |
954 | return result; | |
c906108c SS |
955 | } |
956 | \f | |
957 | /* This page contains the two entry points to this file. */ | |
958 | ||
959 | /* Read an expression from the string *STRINGPTR points to, | |
960 | parse it, and return a pointer to a struct expression that we malloc. | |
961 | Use block BLOCK as the lexical context for variable names; | |
962 | if BLOCK is zero, use the block of the selected stack frame. | |
963 | Meanwhile, advance *STRINGPTR to point after the expression, | |
964 | at the first nonwhite character that is not part of the expression | |
965 | (possibly a null character). | |
966 | ||
967 | If COMMA is nonzero, stop if a comma is reached. */ | |
968 | ||
969 | struct expression * | |
fba45db2 | 970 | parse_exp_1 (char **stringptr, struct block *block, int comma) |
e85c3284 | 971 | { |
65d12d83 | 972 | return parse_exp_in_context (stringptr, block, comma, 0, NULL); |
e85c3284 PH |
973 | } |
974 | ||
975 | /* As for parse_exp_1, except that if VOID_CONTEXT_P, then | |
65d12d83 TT |
976 | no value is expected from the expression. |
977 | OUT_SUBEXP is set when attempting to complete a field name; in this | |
978 | case it is set to the index of the subexpression on the | |
979 | left-hand-side of the struct op. If not doing such completion, it | |
980 | is left untouched. */ | |
e85c3284 PH |
981 | |
982 | static struct expression * | |
983 | parse_exp_in_context (char **stringptr, struct block *block, int comma, | |
65d12d83 | 984 | int void_context_p, int *out_subexp) |
c906108c | 985 | { |
65d12d83 | 986 | volatile struct gdb_exception except; |
c906108c | 987 | struct cleanup *old_chain; |
65d12d83 | 988 | int subexp; |
c906108c SS |
989 | |
990 | lexptr = *stringptr; | |
665132f9 | 991 | prev_lexptr = NULL; |
c906108c SS |
992 | |
993 | paren_depth = 0; | |
994 | type_stack_depth = 0; | |
65d12d83 | 995 | expout_last_struct = -1; |
c906108c SS |
996 | |
997 | comma_terminates = comma; | |
998 | ||
999 | if (lexptr == 0 || *lexptr == 0) | |
e2e0b3e5 | 1000 | error_no_arg (_("expression to compute")); |
c906108c | 1001 | |
74b7792f | 1002 | old_chain = make_cleanup (free_funcalls, 0 /*ignore*/); |
c906108c SS |
1003 | funcall_chain = 0; |
1004 | ||
d705c43c | 1005 | expression_context_block = block; |
59f92a09 | 1006 | |
d705c43c PA |
1007 | /* If no context specified, try using the current frame, if any. */ |
1008 | if (!expression_context_block) | |
1009 | expression_context_block = get_selected_block (&expression_context_pc); | |
1010 | else | |
1011 | expression_context_pc = BLOCK_START (expression_context_block); | |
59f92a09 | 1012 | |
d705c43c | 1013 | /* Fall back to using the current source static context, if any. */ |
59f92a09 | 1014 | |
d705c43c | 1015 | if (!expression_context_block) |
59f92a09 FF |
1016 | { |
1017 | struct symtab_and_line cursal = get_current_source_symtab_and_line (); | |
1018 | if (cursal.symtab) | |
d705c43c PA |
1019 | expression_context_block |
1020 | = BLOCKVECTOR_BLOCK (BLOCKVECTOR (cursal.symtab), STATIC_BLOCK); | |
1021 | if (expression_context_block) | |
1022 | expression_context_pc = BLOCK_START (expression_context_block); | |
84f0252a | 1023 | } |
c906108c | 1024 | |
c906108c SS |
1025 | expout_size = 10; |
1026 | expout_ptr = 0; | |
1027 | expout = (struct expression *) | |
1028 | xmalloc (sizeof (struct expression) + EXP_ELEM_TO_BYTES (expout_size)); | |
1029 | expout->language_defn = current_language; | |
3e79cecf | 1030 | expout->gdbarch = current_gdbarch; |
c906108c | 1031 | |
65d12d83 TT |
1032 | TRY_CATCH (except, RETURN_MASK_ALL) |
1033 | { | |
1034 | if (current_language->la_parser ()) | |
1035 | current_language->la_error (NULL); | |
1036 | } | |
1037 | if (except.reason < 0) | |
1038 | { | |
1039 | if (! in_parse_field) | |
1040 | { | |
1041 | xfree (expout); | |
1042 | throw_exception (except); | |
1043 | } | |
1044 | } | |
c906108c SS |
1045 | |
1046 | discard_cleanups (old_chain); | |
1047 | ||
1048 | /* Record the actual number of expression elements, and then | |
1049 | reallocate the expression memory so that we free up any | |
1050 | excess elements. */ | |
1051 | ||
1052 | expout->nelts = expout_ptr; | |
1053 | expout = (struct expression *) | |
1054 | xrealloc ((char *) expout, | |
1055 | sizeof (struct expression) + EXP_ELEM_TO_BYTES (expout_ptr));; | |
1056 | ||
1057 | /* Convert expression from postfix form as generated by yacc | |
1058 | parser, to a prefix form. */ | |
1059 | ||
c906108c | 1060 | if (expressiondebug) |
24daaebc PH |
1061 | dump_raw_expression (expout, gdb_stdlog, |
1062 | "before conversion to prefix form"); | |
c906108c | 1063 | |
65d12d83 TT |
1064 | subexp = prefixify_expression (expout); |
1065 | if (out_subexp) | |
1066 | *out_subexp = subexp; | |
c906108c | 1067 | |
e85c3284 PH |
1068 | current_language->la_post_parser (&expout, void_context_p); |
1069 | ||
c906108c | 1070 | if (expressiondebug) |
24daaebc | 1071 | dump_prefix_expression (expout, gdb_stdlog); |
c906108c SS |
1072 | |
1073 | *stringptr = lexptr; | |
1074 | return expout; | |
1075 | } | |
1076 | ||
1077 | /* Parse STRING as an expression, and complain if this fails | |
1078 | to use up all of the contents of STRING. */ | |
1079 | ||
1080 | struct expression * | |
fba45db2 | 1081 | parse_expression (char *string) |
c906108c | 1082 | { |
f86f5ca3 | 1083 | struct expression *exp; |
c906108c SS |
1084 | exp = parse_exp_1 (&string, 0, 0); |
1085 | if (*string) | |
8a3fe4f8 | 1086 | error (_("Junk after end of expression.")); |
c906108c SS |
1087 | return exp; |
1088 | } | |
e85c3284 | 1089 | |
65d12d83 TT |
1090 | /* Parse STRING as an expression. If parsing ends in the middle of a |
1091 | field reference, return the type of the left-hand-side of the | |
1092 | reference; furthermore, if the parsing ends in the field name, | |
a0b7aece JK |
1093 | return the field name in *NAME. In all other cases, return NULL. |
1094 | Returned non-NULL *NAME must be freed by the caller. */ | |
65d12d83 TT |
1095 | |
1096 | struct type * | |
1097 | parse_field_expression (char *string, char **name) | |
1098 | { | |
1099 | struct expression *exp = NULL; | |
1100 | struct value *val; | |
1101 | int subexp; | |
1102 | volatile struct gdb_exception except; | |
1103 | ||
1104 | TRY_CATCH (except, RETURN_MASK_ALL) | |
1105 | { | |
1106 | in_parse_field = 1; | |
1107 | exp = parse_exp_in_context (&string, 0, 0, 0, &subexp); | |
1108 | } | |
1109 | in_parse_field = 0; | |
1110 | if (except.reason < 0 || ! exp) | |
1111 | return NULL; | |
1112 | if (expout_last_struct == -1) | |
1113 | { | |
1114 | xfree (exp); | |
1115 | return NULL; | |
1116 | } | |
1117 | ||
1118 | *name = extract_field_op (exp, &subexp); | |
1119 | if (!*name) | |
1120 | { | |
1121 | xfree (exp); | |
1122 | return NULL; | |
1123 | } | |
a0b7aece JK |
1124 | /* (*NAME) is a part of the EXP memory block freed below. */ |
1125 | *name = xstrdup (*name); | |
1126 | ||
65d12d83 TT |
1127 | val = evaluate_subexpression_type (exp, subexp); |
1128 | xfree (exp); | |
1129 | ||
1130 | return value_type (val); | |
1131 | } | |
1132 | ||
e85c3284 PH |
1133 | /* A post-parser that does nothing */ |
1134 | ||
e85c3284 PH |
1135 | void |
1136 | null_post_parser (struct expression **exp, int void_context_p) | |
1137 | { | |
1138 | } | |
c906108c SS |
1139 | \f |
1140 | /* Stuff for maintaining a stack of types. Currently just used by C, but | |
1141 | probably useful for any language which declares its types "backwards". */ | |
1142 | ||
47663de5 MS |
1143 | static void |
1144 | check_type_stack_depth (void) | |
c906108c SS |
1145 | { |
1146 | if (type_stack_depth == type_stack_size) | |
1147 | { | |
1148 | type_stack_size *= 2; | |
1149 | type_stack = (union type_stack_elt *) | |
1150 | xrealloc ((char *) type_stack, type_stack_size * sizeof (*type_stack)); | |
1151 | } | |
47663de5 MS |
1152 | } |
1153 | ||
1154 | void | |
1155 | push_type (enum type_pieces tp) | |
1156 | { | |
1157 | check_type_stack_depth (); | |
c906108c SS |
1158 | type_stack[type_stack_depth++].piece = tp; |
1159 | } | |
1160 | ||
1161 | void | |
fba45db2 | 1162 | push_type_int (int n) |
c906108c | 1163 | { |
47663de5 | 1164 | check_type_stack_depth (); |
c906108c SS |
1165 | type_stack[type_stack_depth++].int_val = n; |
1166 | } | |
1167 | ||
47663de5 MS |
1168 | void |
1169 | push_type_address_space (char *string) | |
1170 | { | |
1171 | push_type_int (address_space_name_to_int (string)); | |
1172 | } | |
1173 | ||
c5aa993b | 1174 | enum type_pieces |
fba45db2 | 1175 | pop_type (void) |
c906108c SS |
1176 | { |
1177 | if (type_stack_depth) | |
1178 | return type_stack[--type_stack_depth].piece; | |
1179 | return tp_end; | |
1180 | } | |
1181 | ||
1182 | int | |
fba45db2 | 1183 | pop_type_int (void) |
c906108c SS |
1184 | { |
1185 | if (type_stack_depth) | |
1186 | return type_stack[--type_stack_depth].int_val; | |
1187 | /* "Can't happen". */ | |
1188 | return 0; | |
1189 | } | |
1190 | ||
1191 | /* Pop the type stack and return the type which corresponds to FOLLOW_TYPE | |
1192 | as modified by all the stuff on the stack. */ | |
1193 | struct type * | |
fba45db2 | 1194 | follow_types (struct type *follow_type) |
c906108c SS |
1195 | { |
1196 | int done = 0; | |
2e2394a0 MS |
1197 | int make_const = 0; |
1198 | int make_volatile = 0; | |
47663de5 | 1199 | int make_addr_space = 0; |
c906108c SS |
1200 | int array_size; |
1201 | struct type *range_type; | |
1202 | ||
1203 | while (!done) | |
1204 | switch (pop_type ()) | |
1205 | { | |
1206 | case tp_end: | |
1207 | done = 1; | |
2e2394a0 MS |
1208 | if (make_const) |
1209 | follow_type = make_cv_type (make_const, | |
1210 | TYPE_VOLATILE (follow_type), | |
1211 | follow_type, 0); | |
1212 | if (make_volatile) | |
1213 | follow_type = make_cv_type (TYPE_CONST (follow_type), | |
1214 | make_volatile, | |
1215 | follow_type, 0); | |
47663de5 MS |
1216 | if (make_addr_space) |
1217 | follow_type = make_type_with_address_space (follow_type, | |
1218 | make_addr_space); | |
1219 | make_const = make_volatile = 0; | |
1220 | make_addr_space = 0; | |
2e2394a0 MS |
1221 | break; |
1222 | case tp_const: | |
1223 | make_const = 1; | |
1224 | break; | |
1225 | case tp_volatile: | |
1226 | make_volatile = 1; | |
c906108c | 1227 | break; |
47663de5 MS |
1228 | case tp_space_identifier: |
1229 | make_addr_space = pop_type_int (); | |
1230 | break; | |
c906108c SS |
1231 | case tp_pointer: |
1232 | follow_type = lookup_pointer_type (follow_type); | |
2e2394a0 MS |
1233 | if (make_const) |
1234 | follow_type = make_cv_type (make_const, | |
1235 | TYPE_VOLATILE (follow_type), | |
1236 | follow_type, 0); | |
1237 | if (make_volatile) | |
1238 | follow_type = make_cv_type (TYPE_CONST (follow_type), | |
1239 | make_volatile, | |
1240 | follow_type, 0); | |
47663de5 MS |
1241 | if (make_addr_space) |
1242 | follow_type = make_type_with_address_space (follow_type, | |
1243 | make_addr_space); | |
2e2394a0 | 1244 | make_const = make_volatile = 0; |
47663de5 | 1245 | make_addr_space = 0; |
c906108c SS |
1246 | break; |
1247 | case tp_reference: | |
1248 | follow_type = lookup_reference_type (follow_type); | |
2e2394a0 | 1249 | if (make_const) |
47663de5 MS |
1250 | follow_type = make_cv_type (make_const, |
1251 | TYPE_VOLATILE (follow_type), | |
1252 | follow_type, 0); | |
2e2394a0 | 1253 | if (make_volatile) |
47663de5 MS |
1254 | follow_type = make_cv_type (TYPE_CONST (follow_type), |
1255 | make_volatile, | |
1256 | follow_type, 0); | |
1257 | if (make_addr_space) | |
1258 | follow_type = make_type_with_address_space (follow_type, | |
1259 | make_addr_space); | |
2e2394a0 | 1260 | make_const = make_volatile = 0; |
47663de5 | 1261 | make_addr_space = 0; |
c906108c SS |
1262 | break; |
1263 | case tp_array: | |
1264 | array_size = pop_type_int (); | |
1265 | /* FIXME-type-allocation: need a way to free this type when we are | |
1266 | done with it. */ | |
1267 | range_type = | |
1268 | create_range_type ((struct type *) NULL, | |
6d84d3d8 | 1269 | builtin_type_int32, 0, |
c906108c SS |
1270 | array_size >= 0 ? array_size - 1 : 0); |
1271 | follow_type = | |
1272 | create_array_type ((struct type *) NULL, | |
1273 | follow_type, range_type); | |
1274 | if (array_size < 0) | |
d78df370 | 1275 | TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (follow_type) = 1; |
c906108c SS |
1276 | break; |
1277 | case tp_function: | |
1278 | /* FIXME-type-allocation: need a way to free this type when we are | |
1279 | done with it. */ | |
1280 | follow_type = lookup_function_type (follow_type); | |
1281 | break; | |
1282 | } | |
1283 | return follow_type; | |
1284 | } | |
1285 | \f | |
f461f5cf PM |
1286 | /* This function avoids direct calls to fprintf |
1287 | in the parser generated debug code. */ | |
1288 | void | |
1289 | parser_fprintf (FILE *x, const char *y, ...) | |
1290 | { | |
1291 | va_list args; | |
1292 | va_start (args, y); | |
1293 | if (x == stderr) | |
1294 | vfprintf_unfiltered (gdb_stderr, y, args); | |
1295 | else | |
1296 | { | |
1297 | fprintf_unfiltered (gdb_stderr, " Unknown FILE used.\n"); | |
1298 | vfprintf_unfiltered (gdb_stderr, y, args); | |
1299 | } | |
1300 | va_end (args); | |
1301 | } | |
1302 | ||
ac9a91a7 | 1303 | void |
fba45db2 | 1304 | _initialize_parse (void) |
ac9a91a7 JM |
1305 | { |
1306 | type_stack_size = 80; | |
1307 | type_stack_depth = 0; | |
1308 | type_stack = (union type_stack_elt *) | |
1309 | xmalloc (type_stack_size * sizeof (*type_stack)); | |
1310 | ||
85c07804 AC |
1311 | add_setshow_zinteger_cmd ("expression", class_maintenance, |
1312 | &expressiondebug, _("\ | |
1313 | Set expression debugging."), _("\ | |
1314 | Show expression debugging."), _("\ | |
1315 | When non-zero, the internal representation of expressions will be printed."), | |
1316 | NULL, | |
920d2a44 | 1317 | show_expressiondebug, |
85c07804 | 1318 | &setdebuglist, &showdebuglist); |
c906108c | 1319 | } |