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, |
9b254dd1 DJ |
4 | 1998, 1999, 2000, 2001, 2004, 2005, 2007, 2008 |
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 | |
403 | the expression. The rationale behind passing in text_symbol_type and | |
404 | data_symbol_type was so that Modula-2 could pass in WORD for | |
405 | data_symbol_type. Perhaps it still is useful to have those types vary | |
406 | based on the language, but they no longer have names like "int", so | |
407 | the initial rationale is gone. */ | |
408 | ||
c906108c | 409 | void |
a858089e MS |
410 | write_exp_msymbol (struct minimal_symbol *msymbol, |
411 | struct type *text_symbol_type, | |
412 | struct type *data_symbol_type) | |
c906108c | 413 | { |
bccdca4a UW |
414 | struct objfile *objfile = msymbol_objfile (msymbol); |
415 | struct gdbarch *gdbarch = get_objfile_arch (objfile); | |
416 | ||
417 | CORE_ADDR addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
418 | asection *bfd_section = SYMBOL_BFD_SECTION (msymbol); | |
419 | enum minimal_symbol_type type = msymbol->type; | |
420 | CORE_ADDR pc; | |
421 | ||
422 | /* The minimal symbol might point to a function descriptor; | |
423 | resolve it to the actual code address instead. */ | |
424 | pc = gdbarch_convert_from_func_ptr_addr (gdbarch, addr, ¤t_target); | |
425 | if (pc != addr) | |
426 | { | |
427 | /* In this case, assume we have a code symbol instead of | |
428 | a data symbol. */ | |
429 | type = mst_text; | |
430 | bfd_section = NULL; | |
431 | addr = pc; | |
432 | } | |
433 | ||
434 | if (overlay_debugging) | |
435 | addr = symbol_overlayed_address (addr, bfd_section); | |
c906108c SS |
436 | |
437 | write_exp_elt_opcode (OP_LONG); | |
a858089e MS |
438 | /* Let's make the type big enough to hold a 64-bit address. */ |
439 | write_exp_elt_type (builtin_type_CORE_ADDR); | |
c906108c | 440 | write_exp_elt_longcst ((LONGEST) addr); |
c906108c SS |
441 | write_exp_elt_opcode (OP_LONG); |
442 | ||
bccdca4a | 443 | if (bfd_section && bfd_section->flags & SEC_THREAD_LOCAL) |
9e35dae4 | 444 | { |
9e35dae4 | 445 | write_exp_elt_opcode (UNOP_MEMVAL_TLS); |
bccdca4a | 446 | write_exp_elt_objfile (objfile); |
64c50499 | 447 | write_exp_elt_type (builtin_type (gdbarch)->nodebug_tls_symbol); |
9e35dae4 DJ |
448 | write_exp_elt_opcode (UNOP_MEMVAL_TLS); |
449 | return; | |
450 | } | |
451 | ||
c906108c | 452 | write_exp_elt_opcode (UNOP_MEMVAL); |
bccdca4a | 453 | switch (type) |
c906108c SS |
454 | { |
455 | case mst_text: | |
456 | case mst_file_text: | |
457 | case mst_solib_trampoline: | |
64c50499 | 458 | write_exp_elt_type (builtin_type (gdbarch)->nodebug_text_symbol); |
c906108c SS |
459 | break; |
460 | ||
461 | case mst_data: | |
462 | case mst_file_data: | |
463 | case mst_bss: | |
464 | case mst_file_bss: | |
64c50499 | 465 | write_exp_elt_type (builtin_type (gdbarch)->nodebug_data_symbol); |
c906108c SS |
466 | break; |
467 | ||
468 | default: | |
64c50499 | 469 | write_exp_elt_type (builtin_type (gdbarch)->nodebug_unknown_symbol); |
c906108c SS |
470 | break; |
471 | } | |
472 | write_exp_elt_opcode (UNOP_MEMVAL); | |
473 | } | |
65d12d83 TT |
474 | |
475 | /* Mark the current index as the starting location of a structure | |
476 | expression. This is used when completing on field names. */ | |
477 | ||
478 | void | |
479 | mark_struct_expression (void) | |
480 | { | |
481 | expout_last_struct = expout_ptr; | |
482 | } | |
483 | ||
c906108c SS |
484 | \f |
485 | /* Recognize tokens that start with '$'. These include: | |
486 | ||
c5aa993b JM |
487 | $regname A native register name or a "standard |
488 | register name". | |
c906108c | 489 | |
c5aa993b JM |
490 | $variable A convenience variable with a name chosen |
491 | by the user. | |
c906108c | 492 | |
c5aa993b JM |
493 | $digits Value history with index <digits>, starting |
494 | from the first value which has index 1. | |
c906108c | 495 | |
c5aa993b JM |
496 | $$digits Value history with index <digits> relative |
497 | to the last value. I.E. $$0 is the last | |
498 | value, $$1 is the one previous to that, $$2 | |
499 | is the one previous to $$1, etc. | |
c906108c | 500 | |
c5aa993b | 501 | $ | $0 | $$0 The last value in the value history. |
c906108c | 502 | |
c5aa993b JM |
503 | $$ An abbreviation for the second to the last |
504 | value in the value history, I.E. $$1 | |
c906108c | 505 | |
c5aa993b | 506 | */ |
c906108c SS |
507 | |
508 | void | |
fba45db2 | 509 | write_dollar_variable (struct stoken str) |
c906108c | 510 | { |
d7318818 RC |
511 | struct symbol *sym = NULL; |
512 | struct minimal_symbol *msym = NULL; | |
c4a3d09a | 513 | struct internalvar *isym = NULL; |
d7318818 | 514 | |
c906108c SS |
515 | /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1) |
516 | and $$digits (equivalent to $<-digits> if you could type that). */ | |
517 | ||
c906108c SS |
518 | int negate = 0; |
519 | int i = 1; | |
520 | /* Double dollar means negate the number and add -1 as well. | |
521 | Thus $$ alone means -1. */ | |
522 | if (str.length >= 2 && str.ptr[1] == '$') | |
523 | { | |
524 | negate = 1; | |
525 | i = 2; | |
526 | } | |
527 | if (i == str.length) | |
528 | { | |
529 | /* Just dollars (one or two) */ | |
c5aa993b | 530 | i = -negate; |
c906108c SS |
531 | goto handle_last; |
532 | } | |
533 | /* Is the rest of the token digits? */ | |
534 | for (; i < str.length; i++) | |
535 | if (!(str.ptr[i] >= '0' && str.ptr[i] <= '9')) | |
536 | break; | |
537 | if (i == str.length) | |
538 | { | |
539 | i = atoi (str.ptr + 1 + negate); | |
540 | if (negate) | |
c5aa993b | 541 | i = -i; |
c906108c SS |
542 | goto handle_last; |
543 | } | |
c5aa993b | 544 | |
c906108c SS |
545 | /* Handle tokens that refer to machine registers: |
546 | $ followed by a register name. */ | |
029a67e4 UW |
547 | i = user_reg_map_name_to_regnum (current_gdbarch, |
548 | str.ptr + 1, str.length - 1); | |
c5aa993b | 549 | if (i >= 0) |
c906108c SS |
550 | goto handle_register; |
551 | ||
c4a3d09a MF |
552 | /* Any names starting with $ are probably debugger internal variables. */ |
553 | ||
554 | isym = lookup_only_internalvar (copy_name (str) + 1); | |
555 | if (isym) | |
556 | { | |
557 | write_exp_elt_opcode (OP_INTERNALVAR); | |
558 | write_exp_elt_intern (isym); | |
559 | write_exp_elt_opcode (OP_INTERNALVAR); | |
560 | return; | |
561 | } | |
562 | ||
d7318818 RC |
563 | /* On some systems, such as HP-UX and hppa-linux, certain system routines |
564 | have names beginning with $ or $$. Check for those, first. */ | |
565 | ||
566 | sym = lookup_symbol (copy_name (str), (struct block *) NULL, | |
2570f2b7 | 567 | VAR_DOMAIN, (int *) NULL); |
d7318818 RC |
568 | if (sym) |
569 | { | |
570 | write_exp_elt_opcode (OP_VAR_VALUE); | |
571 | write_exp_elt_block (block_found); /* set by lookup_symbol */ | |
572 | write_exp_elt_sym (sym); | |
573 | write_exp_elt_opcode (OP_VAR_VALUE); | |
574 | return; | |
575 | } | |
576 | msym = lookup_minimal_symbol (copy_name (str), NULL, NULL); | |
577 | if (msym) | |
c906108c | 578 | { |
d7318818 RC |
579 | write_exp_msymbol (msym, |
580 | lookup_function_type (builtin_type_int), | |
581 | builtin_type_int); | |
582 | return; | |
c906108c | 583 | } |
c5aa993b | 584 | |
c4a3d09a | 585 | /* Any other names are assumed to be debugger internal variables. */ |
c906108c SS |
586 | |
587 | write_exp_elt_opcode (OP_INTERNALVAR); | |
c4a3d09a | 588 | write_exp_elt_intern (create_internalvar (copy_name (str) + 1)); |
c5aa993b | 589 | write_exp_elt_opcode (OP_INTERNALVAR); |
c906108c | 590 | return; |
c5aa993b | 591 | handle_last: |
c906108c SS |
592 | write_exp_elt_opcode (OP_LAST); |
593 | write_exp_elt_longcst ((LONGEST) i); | |
594 | write_exp_elt_opcode (OP_LAST); | |
595 | return; | |
c5aa993b | 596 | handle_register: |
c906108c | 597 | write_exp_elt_opcode (OP_REGISTER); |
67f3407f DJ |
598 | str.length--; |
599 | str.ptr++; | |
600 | write_exp_string (str); | |
c5aa993b | 601 | write_exp_elt_opcode (OP_REGISTER); |
c906108c SS |
602 | return; |
603 | } | |
604 | ||
605 | ||
c906108c | 606 | char * |
fba45db2 | 607 | find_template_name_end (char *p) |
c906108c SS |
608 | { |
609 | int depth = 1; | |
610 | int just_seen_right = 0; | |
611 | int just_seen_colon = 0; | |
612 | int just_seen_space = 0; | |
c5aa993b | 613 | |
c906108c SS |
614 | if (!p || (*p != '<')) |
615 | return 0; | |
616 | ||
617 | while (*++p) | |
618 | { | |
619 | switch (*p) | |
c5aa993b JM |
620 | { |
621 | case '\'': | |
622 | case '\"': | |
623 | case '{': | |
624 | case '}': | |
625 | /* In future, may want to allow these?? */ | |
626 | return 0; | |
627 | case '<': | |
628 | depth++; /* start nested template */ | |
629 | if (just_seen_colon || just_seen_right || just_seen_space) | |
630 | return 0; /* but not after : or :: or > or space */ | |
631 | break; | |
632 | case '>': | |
633 | if (just_seen_colon || just_seen_right) | |
634 | return 0; /* end a (nested?) template */ | |
635 | just_seen_right = 1; /* but not after : or :: */ | |
636 | if (--depth == 0) /* also disallow >>, insist on > > */ | |
637 | return ++p; /* if outermost ended, return */ | |
638 | break; | |
639 | case ':': | |
640 | if (just_seen_space || (just_seen_colon > 1)) | |
641 | return 0; /* nested class spec coming up */ | |
642 | just_seen_colon++; /* we allow :: but not :::: */ | |
643 | break; | |
644 | case ' ': | |
645 | break; | |
646 | default: | |
647 | if (!((*p >= 'a' && *p <= 'z') || /* allow token chars */ | |
648 | (*p >= 'A' && *p <= 'Z') || | |
649 | (*p >= '0' && *p <= '9') || | |
650 | (*p == '_') || (*p == ',') || /* commas for template args */ | |
651 | (*p == '&') || (*p == '*') || /* pointer and ref types */ | |
652 | (*p == '(') || (*p == ')') || /* function types */ | |
653 | (*p == '[') || (*p == ']'))) /* array types */ | |
654 | return 0; | |
655 | } | |
c906108c | 656 | if (*p != ' ') |
c5aa993b | 657 | just_seen_space = 0; |
c906108c | 658 | if (*p != ':') |
c5aa993b | 659 | just_seen_colon = 0; |
c906108c | 660 | if (*p != '>') |
c5aa993b | 661 | just_seen_right = 0; |
c906108c SS |
662 | } |
663 | return 0; | |
664 | } | |
c5aa993b | 665 | \f |
c906108c SS |
666 | |
667 | ||
c906108c SS |
668 | /* Return a null-terminated temporary copy of the name |
669 | of a string token. */ | |
670 | ||
671 | char * | |
fba45db2 | 672 | copy_name (struct stoken token) |
c906108c | 673 | { |
3a913e29 JB |
674 | /* Make sure there's enough space for the token. */ |
675 | if (namecopy_size < token.length + 1) | |
676 | { | |
677 | namecopy_size = token.length + 1; | |
678 | namecopy = xrealloc (namecopy, token.length + 1); | |
679 | } | |
680 | ||
c906108c SS |
681 | memcpy (namecopy, token.ptr, token.length); |
682 | namecopy[token.length] = 0; | |
3a913e29 | 683 | |
c906108c SS |
684 | return namecopy; |
685 | } | |
686 | \f | |
687 | /* Reverse an expression from suffix form (in which it is constructed) | |
65d12d83 TT |
688 | to prefix form (in which we can conveniently print or execute it). |
689 | Ordinarily this always returns -1. However, if EXPOUT_LAST_STRUCT | |
690 | is not -1 (i.e., we are trying to complete a field name), it will | |
691 | return the index of the subexpression which is the left-hand-side | |
692 | of the struct operation at EXPOUT_LAST_STRUCT. */ | |
c906108c | 693 | |
65d12d83 | 694 | static int |
f86f5ca3 | 695 | prefixify_expression (struct expression *expr) |
c906108c | 696 | { |
df2a60d0 | 697 | int len = sizeof (struct expression) + EXP_ELEM_TO_BYTES (expr->nelts); |
f86f5ca3 PH |
698 | struct expression *temp; |
699 | int inpos = expr->nelts, outpos = 0; | |
c906108c SS |
700 | |
701 | temp = (struct expression *) alloca (len); | |
702 | ||
703 | /* Copy the original expression into temp. */ | |
704 | memcpy (temp, expr, len); | |
705 | ||
65d12d83 | 706 | return prefixify_subexp (temp, expr, inpos, outpos); |
c906108c SS |
707 | } |
708 | ||
24daaebc PH |
709 | /* Return the number of exp_elements in the postfix subexpression |
710 | of EXPR whose operator is at index ENDPOS - 1 in EXPR. */ | |
c906108c SS |
711 | |
712 | int | |
f86f5ca3 | 713 | length_of_subexp (struct expression *expr, int endpos) |
24daaebc PH |
714 | { |
715 | int oplen, args, i; | |
716 | ||
717 | operator_length (expr, endpos, &oplen, &args); | |
718 | ||
719 | while (args > 0) | |
720 | { | |
721 | oplen += length_of_subexp (expr, endpos - oplen); | |
722 | args--; | |
723 | } | |
724 | ||
725 | return oplen; | |
726 | } | |
727 | ||
728 | /* Sets *OPLENP to the length of the operator whose (last) index is | |
729 | ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that | |
730 | operator takes. */ | |
731 | ||
732 | void | |
733 | operator_length (struct expression *expr, int endpos, int *oplenp, int *argsp) | |
5f9769d1 PH |
734 | { |
735 | expr->language_defn->la_exp_desc->operator_length (expr, endpos, | |
736 | oplenp, argsp); | |
737 | } | |
738 | ||
739 | /* Default value for operator_length in exp_descriptor vectors. */ | |
740 | ||
741 | void | |
742 | operator_length_standard (struct expression *expr, int endpos, | |
743 | int *oplenp, int *argsp) | |
c906108c | 744 | { |
f86f5ca3 PH |
745 | int oplen = 1; |
746 | int args = 0; | |
0b4e1325 | 747 | enum f90_range_type range_type; |
f86f5ca3 | 748 | int i; |
c906108c SS |
749 | |
750 | if (endpos < 1) | |
8a3fe4f8 | 751 | error (_("?error in operator_length_standard")); |
c906108c SS |
752 | |
753 | i = (int) expr->elts[endpos - 1].opcode; | |
754 | ||
755 | switch (i) | |
756 | { | |
757 | /* C++ */ | |
758 | case OP_SCOPE: | |
759 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); | |
760 | oplen = 5 + BYTES_TO_EXP_ELEM (oplen + 1); | |
761 | break; | |
762 | ||
763 | case OP_LONG: | |
764 | case OP_DOUBLE: | |
27bc4d80 | 765 | case OP_DECFLOAT: |
c906108c SS |
766 | case OP_VAR_VALUE: |
767 | oplen = 4; | |
768 | break; | |
769 | ||
770 | case OP_TYPE: | |
771 | case OP_BOOL: | |
772 | case OP_LAST: | |
c906108c SS |
773 | case OP_INTERNALVAR: |
774 | oplen = 3; | |
775 | break; | |
776 | ||
777 | case OP_COMPLEX: | |
c5aa993b | 778 | oplen = 1; |
c906108c | 779 | args = 2; |
c5aa993b | 780 | break; |
c906108c SS |
781 | |
782 | case OP_FUNCALL: | |
783 | case OP_F77_UNDETERMINED_ARGLIST: | |
784 | oplen = 3; | |
785 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); | |
786 | break; | |
787 | ||
646df18d | 788 | case OP_OBJC_MSGCALL: /* Objective C message (method) call */ |
53c551b7 AF |
789 | oplen = 4; |
790 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); | |
791 | break; | |
792 | ||
c906108c SS |
793 | case UNOP_MAX: |
794 | case UNOP_MIN: | |
795 | oplen = 3; | |
796 | break; | |
797 | ||
c5aa993b JM |
798 | case BINOP_VAL: |
799 | case UNOP_CAST: | |
800 | case UNOP_MEMVAL: | |
c906108c SS |
801 | oplen = 3; |
802 | args = 1; | |
803 | break; | |
804 | ||
9e35dae4 DJ |
805 | case UNOP_MEMVAL_TLS: |
806 | oplen = 4; | |
807 | args = 1; | |
808 | break; | |
809 | ||
c906108c SS |
810 | case UNOP_ABS: |
811 | case UNOP_CAP: | |
812 | case UNOP_CHR: | |
813 | case UNOP_FLOAT: | |
814 | case UNOP_HIGH: | |
815 | case UNOP_ODD: | |
816 | case UNOP_ORD: | |
817 | case UNOP_TRUNC: | |
818 | oplen = 1; | |
819 | args = 1; | |
820 | break; | |
821 | ||
822 | case OP_LABELED: | |
823 | case STRUCTOP_STRUCT: | |
824 | case STRUCTOP_PTR: | |
825 | args = 1; | |
826 | /* fall through */ | |
67f3407f | 827 | case OP_REGISTER: |
c906108c SS |
828 | case OP_M2_STRING: |
829 | case OP_STRING: | |
646df18d AF |
830 | case OP_OBJC_NSSTRING: /* Objective C Foundation Class NSString constant */ |
831 | case OP_OBJC_SELECTOR: /* Objective C "@selector" pseudo-op */ | |
c906108c | 832 | case OP_NAME: |
c906108c SS |
833 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); |
834 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1); | |
835 | break; | |
836 | ||
837 | case OP_BITSTRING: | |
838 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); | |
839 | oplen = (oplen + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; | |
840 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen); | |
841 | break; | |
842 | ||
843 | case OP_ARRAY: | |
844 | oplen = 4; | |
845 | args = longest_to_int (expr->elts[endpos - 2].longconst); | |
846 | args -= longest_to_int (expr->elts[endpos - 3].longconst); | |
847 | args += 1; | |
848 | break; | |
849 | ||
850 | case TERNOP_COND: | |
851 | case TERNOP_SLICE: | |
852 | case TERNOP_SLICE_COUNT: | |
853 | args = 3; | |
854 | break; | |
855 | ||
856 | /* Modula-2 */ | |
c5aa993b | 857 | case MULTI_SUBSCRIPT: |
c906108c | 858 | oplen = 3; |
c5aa993b | 859 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); |
c906108c SS |
860 | break; |
861 | ||
862 | case BINOP_ASSIGN_MODIFY: | |
863 | oplen = 3; | |
864 | args = 2; | |
865 | break; | |
866 | ||
867 | /* C++ */ | |
868 | case OP_THIS: | |
646df18d | 869 | case OP_OBJC_SELF: |
c906108c SS |
870 | oplen = 2; |
871 | break; | |
872 | ||
0b4e1325 WZ |
873 | case OP_F90_RANGE: |
874 | oplen = 3; | |
875 | ||
876 | range_type = longest_to_int (expr->elts[endpos - 2].longconst); | |
877 | switch (range_type) | |
878 | { | |
879 | case LOW_BOUND_DEFAULT: | |
880 | case HIGH_BOUND_DEFAULT: | |
881 | args = 1; | |
882 | break; | |
883 | case BOTH_BOUND_DEFAULT: | |
884 | args = 0; | |
885 | break; | |
886 | case NONE_BOUND_DEFAULT: | |
887 | args = 2; | |
888 | break; | |
889 | } | |
890 | ||
891 | break; | |
892 | ||
c906108c SS |
893 | default: |
894 | args = 1 + (i < (int) BINOP_END); | |
895 | } | |
896 | ||
24daaebc PH |
897 | *oplenp = oplen; |
898 | *argsp = args; | |
c906108c SS |
899 | } |
900 | ||
901 | /* Copy the subexpression ending just before index INEND in INEXPR | |
902 | into OUTEXPR, starting at index OUTBEG. | |
65d12d83 TT |
903 | In the process, convert it from suffix to prefix form. |
904 | If EXPOUT_LAST_STRUCT is -1, then this function always returns -1. | |
905 | Otherwise, it returns the index of the subexpression which is the | |
906 | left-hand-side of the expression at EXPOUT_LAST_STRUCT. */ | |
c906108c | 907 | |
65d12d83 | 908 | static int |
f86f5ca3 PH |
909 | prefixify_subexp (struct expression *inexpr, |
910 | struct expression *outexpr, int inend, int outbeg) | |
c906108c | 911 | { |
24daaebc PH |
912 | int oplen; |
913 | int args; | |
f86f5ca3 | 914 | int i; |
c906108c SS |
915 | int *arglens; |
916 | enum exp_opcode opcode; | |
65d12d83 | 917 | int result = -1; |
c906108c | 918 | |
24daaebc | 919 | operator_length (inexpr, inend, &oplen, &args); |
c906108c SS |
920 | |
921 | /* Copy the final operator itself, from the end of the input | |
922 | to the beginning of the output. */ | |
923 | inend -= oplen; | |
924 | memcpy (&outexpr->elts[outbeg], &inexpr->elts[inend], | |
925 | EXP_ELEM_TO_BYTES (oplen)); | |
926 | outbeg += oplen; | |
927 | ||
65d12d83 TT |
928 | if (expout_last_struct == inend) |
929 | result = outbeg - oplen; | |
930 | ||
c906108c SS |
931 | /* Find the lengths of the arg subexpressions. */ |
932 | arglens = (int *) alloca (args * sizeof (int)); | |
933 | for (i = args - 1; i >= 0; i--) | |
934 | { | |
935 | oplen = length_of_subexp (inexpr, inend); | |
936 | arglens[i] = oplen; | |
937 | inend -= oplen; | |
938 | } | |
939 | ||
940 | /* Now copy each subexpression, preserving the order of | |
941 | the subexpressions, but prefixifying each one. | |
942 | In this loop, inend starts at the beginning of | |
943 | the expression this level is working on | |
944 | and marches forward over the arguments. | |
945 | outbeg does similarly in the output. */ | |
946 | for (i = 0; i < args; i++) | |
947 | { | |
65d12d83 | 948 | int r; |
c906108c SS |
949 | oplen = arglens[i]; |
950 | inend += oplen; | |
65d12d83 TT |
951 | r = prefixify_subexp (inexpr, outexpr, inend, outbeg); |
952 | if (r != -1) | |
953 | { | |
954 | /* Return immediately. We probably have only parsed a | |
955 | partial expression, so we don't want to try to reverse | |
956 | the other operands. */ | |
957 | return r; | |
958 | } | |
c906108c SS |
959 | outbeg += oplen; |
960 | } | |
65d12d83 TT |
961 | |
962 | return result; | |
c906108c SS |
963 | } |
964 | \f | |
965 | /* This page contains the two entry points to this file. */ | |
966 | ||
967 | /* Read an expression from the string *STRINGPTR points to, | |
968 | parse it, and return a pointer to a struct expression that we malloc. | |
969 | Use block BLOCK as the lexical context for variable names; | |
970 | if BLOCK is zero, use the block of the selected stack frame. | |
971 | Meanwhile, advance *STRINGPTR to point after the expression, | |
972 | at the first nonwhite character that is not part of the expression | |
973 | (possibly a null character). | |
974 | ||
975 | If COMMA is nonzero, stop if a comma is reached. */ | |
976 | ||
977 | struct expression * | |
fba45db2 | 978 | parse_exp_1 (char **stringptr, struct block *block, int comma) |
e85c3284 | 979 | { |
65d12d83 | 980 | return parse_exp_in_context (stringptr, block, comma, 0, NULL); |
e85c3284 PH |
981 | } |
982 | ||
983 | /* As for parse_exp_1, except that if VOID_CONTEXT_P, then | |
65d12d83 TT |
984 | no value is expected from the expression. |
985 | OUT_SUBEXP is set when attempting to complete a field name; in this | |
986 | case it is set to the index of the subexpression on the | |
987 | left-hand-side of the struct op. If not doing such completion, it | |
988 | is left untouched. */ | |
e85c3284 PH |
989 | |
990 | static struct expression * | |
991 | parse_exp_in_context (char **stringptr, struct block *block, int comma, | |
65d12d83 | 992 | int void_context_p, int *out_subexp) |
c906108c | 993 | { |
65d12d83 | 994 | volatile struct gdb_exception except; |
c906108c | 995 | struct cleanup *old_chain; |
65d12d83 | 996 | int subexp; |
c906108c SS |
997 | |
998 | lexptr = *stringptr; | |
665132f9 | 999 | prev_lexptr = NULL; |
c906108c SS |
1000 | |
1001 | paren_depth = 0; | |
1002 | type_stack_depth = 0; | |
65d12d83 | 1003 | expout_last_struct = -1; |
c906108c SS |
1004 | |
1005 | comma_terminates = comma; | |
1006 | ||
1007 | if (lexptr == 0 || *lexptr == 0) | |
e2e0b3e5 | 1008 | error_no_arg (_("expression to compute")); |
c906108c | 1009 | |
74b7792f | 1010 | old_chain = make_cleanup (free_funcalls, 0 /*ignore*/); |
c906108c SS |
1011 | funcall_chain = 0; |
1012 | ||
d705c43c | 1013 | expression_context_block = block; |
59f92a09 | 1014 | |
d705c43c PA |
1015 | /* If no context specified, try using the current frame, if any. */ |
1016 | if (!expression_context_block) | |
1017 | expression_context_block = get_selected_block (&expression_context_pc); | |
1018 | else | |
1019 | expression_context_pc = BLOCK_START (expression_context_block); | |
59f92a09 | 1020 | |
d705c43c | 1021 | /* Fall back to using the current source static context, if any. */ |
59f92a09 | 1022 | |
d705c43c | 1023 | if (!expression_context_block) |
59f92a09 FF |
1024 | { |
1025 | struct symtab_and_line cursal = get_current_source_symtab_and_line (); | |
1026 | if (cursal.symtab) | |
d705c43c PA |
1027 | expression_context_block |
1028 | = BLOCKVECTOR_BLOCK (BLOCKVECTOR (cursal.symtab), STATIC_BLOCK); | |
1029 | if (expression_context_block) | |
1030 | expression_context_pc = BLOCK_START (expression_context_block); | |
84f0252a | 1031 | } |
c906108c | 1032 | |
c906108c SS |
1033 | expout_size = 10; |
1034 | expout_ptr = 0; | |
1035 | expout = (struct expression *) | |
1036 | xmalloc (sizeof (struct expression) + EXP_ELEM_TO_BYTES (expout_size)); | |
1037 | expout->language_defn = current_language; | |
c906108c | 1038 | |
65d12d83 TT |
1039 | TRY_CATCH (except, RETURN_MASK_ALL) |
1040 | { | |
1041 | if (current_language->la_parser ()) | |
1042 | current_language->la_error (NULL); | |
1043 | } | |
1044 | if (except.reason < 0) | |
1045 | { | |
1046 | if (! in_parse_field) | |
1047 | { | |
1048 | xfree (expout); | |
1049 | throw_exception (except); | |
1050 | } | |
1051 | } | |
c906108c SS |
1052 | |
1053 | discard_cleanups (old_chain); | |
1054 | ||
1055 | /* Record the actual number of expression elements, and then | |
1056 | reallocate the expression memory so that we free up any | |
1057 | excess elements. */ | |
1058 | ||
1059 | expout->nelts = expout_ptr; | |
1060 | expout = (struct expression *) | |
1061 | xrealloc ((char *) expout, | |
1062 | sizeof (struct expression) + EXP_ELEM_TO_BYTES (expout_ptr));; | |
1063 | ||
1064 | /* Convert expression from postfix form as generated by yacc | |
1065 | parser, to a prefix form. */ | |
1066 | ||
c906108c | 1067 | if (expressiondebug) |
24daaebc PH |
1068 | dump_raw_expression (expout, gdb_stdlog, |
1069 | "before conversion to prefix form"); | |
c906108c | 1070 | |
65d12d83 TT |
1071 | subexp = prefixify_expression (expout); |
1072 | if (out_subexp) | |
1073 | *out_subexp = subexp; | |
c906108c | 1074 | |
e85c3284 PH |
1075 | current_language->la_post_parser (&expout, void_context_p); |
1076 | ||
c906108c | 1077 | if (expressiondebug) |
24daaebc | 1078 | dump_prefix_expression (expout, gdb_stdlog); |
c906108c SS |
1079 | |
1080 | *stringptr = lexptr; | |
1081 | return expout; | |
1082 | } | |
1083 | ||
1084 | /* Parse STRING as an expression, and complain if this fails | |
1085 | to use up all of the contents of STRING. */ | |
1086 | ||
1087 | struct expression * | |
fba45db2 | 1088 | parse_expression (char *string) |
c906108c | 1089 | { |
f86f5ca3 | 1090 | struct expression *exp; |
c906108c SS |
1091 | exp = parse_exp_1 (&string, 0, 0); |
1092 | if (*string) | |
8a3fe4f8 | 1093 | error (_("Junk after end of expression.")); |
c906108c SS |
1094 | return exp; |
1095 | } | |
e85c3284 | 1096 | |
65d12d83 TT |
1097 | /* Parse STRING as an expression. If parsing ends in the middle of a |
1098 | field reference, return the type of the left-hand-side of the | |
1099 | reference; furthermore, if the parsing ends in the field name, | |
1100 | return the field name in *NAME. In all other cases, return NULL. */ | |
1101 | ||
1102 | struct type * | |
1103 | parse_field_expression (char *string, char **name) | |
1104 | { | |
1105 | struct expression *exp = NULL; | |
1106 | struct value *val; | |
1107 | int subexp; | |
1108 | volatile struct gdb_exception except; | |
1109 | ||
1110 | TRY_CATCH (except, RETURN_MASK_ALL) | |
1111 | { | |
1112 | in_parse_field = 1; | |
1113 | exp = parse_exp_in_context (&string, 0, 0, 0, &subexp); | |
1114 | } | |
1115 | in_parse_field = 0; | |
1116 | if (except.reason < 0 || ! exp) | |
1117 | return NULL; | |
1118 | if (expout_last_struct == -1) | |
1119 | { | |
1120 | xfree (exp); | |
1121 | return NULL; | |
1122 | } | |
1123 | ||
1124 | *name = extract_field_op (exp, &subexp); | |
1125 | if (!*name) | |
1126 | { | |
1127 | xfree (exp); | |
1128 | return NULL; | |
1129 | } | |
1130 | val = evaluate_subexpression_type (exp, subexp); | |
1131 | xfree (exp); | |
1132 | ||
1133 | return value_type (val); | |
1134 | } | |
1135 | ||
e85c3284 PH |
1136 | /* A post-parser that does nothing */ |
1137 | ||
e85c3284 PH |
1138 | void |
1139 | null_post_parser (struct expression **exp, int void_context_p) | |
1140 | { | |
1141 | } | |
c906108c SS |
1142 | \f |
1143 | /* Stuff for maintaining a stack of types. Currently just used by C, but | |
1144 | probably useful for any language which declares its types "backwards". */ | |
1145 | ||
47663de5 MS |
1146 | static void |
1147 | check_type_stack_depth (void) | |
c906108c SS |
1148 | { |
1149 | if (type_stack_depth == type_stack_size) | |
1150 | { | |
1151 | type_stack_size *= 2; | |
1152 | type_stack = (union type_stack_elt *) | |
1153 | xrealloc ((char *) type_stack, type_stack_size * sizeof (*type_stack)); | |
1154 | } | |
47663de5 MS |
1155 | } |
1156 | ||
1157 | void | |
1158 | push_type (enum type_pieces tp) | |
1159 | { | |
1160 | check_type_stack_depth (); | |
c906108c SS |
1161 | type_stack[type_stack_depth++].piece = tp; |
1162 | } | |
1163 | ||
1164 | void | |
fba45db2 | 1165 | push_type_int (int n) |
c906108c | 1166 | { |
47663de5 | 1167 | check_type_stack_depth (); |
c906108c SS |
1168 | type_stack[type_stack_depth++].int_val = n; |
1169 | } | |
1170 | ||
47663de5 MS |
1171 | void |
1172 | push_type_address_space (char *string) | |
1173 | { | |
1174 | push_type_int (address_space_name_to_int (string)); | |
1175 | } | |
1176 | ||
c5aa993b | 1177 | enum type_pieces |
fba45db2 | 1178 | pop_type (void) |
c906108c SS |
1179 | { |
1180 | if (type_stack_depth) | |
1181 | return type_stack[--type_stack_depth].piece; | |
1182 | return tp_end; | |
1183 | } | |
1184 | ||
1185 | int | |
fba45db2 | 1186 | pop_type_int (void) |
c906108c SS |
1187 | { |
1188 | if (type_stack_depth) | |
1189 | return type_stack[--type_stack_depth].int_val; | |
1190 | /* "Can't happen". */ | |
1191 | return 0; | |
1192 | } | |
1193 | ||
1194 | /* Pop the type stack and return the type which corresponds to FOLLOW_TYPE | |
1195 | as modified by all the stuff on the stack. */ | |
1196 | struct type * | |
fba45db2 | 1197 | follow_types (struct type *follow_type) |
c906108c SS |
1198 | { |
1199 | int done = 0; | |
2e2394a0 MS |
1200 | int make_const = 0; |
1201 | int make_volatile = 0; | |
47663de5 | 1202 | int make_addr_space = 0; |
c906108c SS |
1203 | int array_size; |
1204 | struct type *range_type; | |
1205 | ||
1206 | while (!done) | |
1207 | switch (pop_type ()) | |
1208 | { | |
1209 | case tp_end: | |
1210 | done = 1; | |
2e2394a0 MS |
1211 | if (make_const) |
1212 | follow_type = make_cv_type (make_const, | |
1213 | TYPE_VOLATILE (follow_type), | |
1214 | follow_type, 0); | |
1215 | if (make_volatile) | |
1216 | follow_type = make_cv_type (TYPE_CONST (follow_type), | |
1217 | make_volatile, | |
1218 | follow_type, 0); | |
47663de5 MS |
1219 | if (make_addr_space) |
1220 | follow_type = make_type_with_address_space (follow_type, | |
1221 | make_addr_space); | |
1222 | make_const = make_volatile = 0; | |
1223 | make_addr_space = 0; | |
2e2394a0 MS |
1224 | break; |
1225 | case tp_const: | |
1226 | make_const = 1; | |
1227 | break; | |
1228 | case tp_volatile: | |
1229 | make_volatile = 1; | |
c906108c | 1230 | break; |
47663de5 MS |
1231 | case tp_space_identifier: |
1232 | make_addr_space = pop_type_int (); | |
1233 | break; | |
c906108c SS |
1234 | case tp_pointer: |
1235 | follow_type = lookup_pointer_type (follow_type); | |
2e2394a0 MS |
1236 | if (make_const) |
1237 | follow_type = make_cv_type (make_const, | |
1238 | TYPE_VOLATILE (follow_type), | |
1239 | follow_type, 0); | |
1240 | if (make_volatile) | |
1241 | follow_type = make_cv_type (TYPE_CONST (follow_type), | |
1242 | make_volatile, | |
1243 | follow_type, 0); | |
47663de5 MS |
1244 | if (make_addr_space) |
1245 | follow_type = make_type_with_address_space (follow_type, | |
1246 | make_addr_space); | |
2e2394a0 | 1247 | make_const = make_volatile = 0; |
47663de5 | 1248 | make_addr_space = 0; |
c906108c SS |
1249 | break; |
1250 | case tp_reference: | |
1251 | follow_type = lookup_reference_type (follow_type); | |
2e2394a0 | 1252 | if (make_const) |
47663de5 MS |
1253 | follow_type = make_cv_type (make_const, |
1254 | TYPE_VOLATILE (follow_type), | |
1255 | follow_type, 0); | |
2e2394a0 | 1256 | if (make_volatile) |
47663de5 MS |
1257 | follow_type = make_cv_type (TYPE_CONST (follow_type), |
1258 | make_volatile, | |
1259 | follow_type, 0); | |
1260 | if (make_addr_space) | |
1261 | follow_type = make_type_with_address_space (follow_type, | |
1262 | make_addr_space); | |
2e2394a0 | 1263 | make_const = make_volatile = 0; |
47663de5 | 1264 | make_addr_space = 0; |
c906108c SS |
1265 | break; |
1266 | case tp_array: | |
1267 | array_size = pop_type_int (); | |
1268 | /* FIXME-type-allocation: need a way to free this type when we are | |
1269 | done with it. */ | |
1270 | range_type = | |
1271 | create_range_type ((struct type *) NULL, | |
1272 | builtin_type_int, 0, | |
1273 | array_size >= 0 ? array_size - 1 : 0); | |
1274 | follow_type = | |
1275 | create_array_type ((struct type *) NULL, | |
1276 | follow_type, range_type); | |
1277 | if (array_size < 0) | |
c5aa993b | 1278 | TYPE_ARRAY_UPPER_BOUND_TYPE (follow_type) |
c906108c SS |
1279 | = BOUND_CANNOT_BE_DETERMINED; |
1280 | break; | |
1281 | case tp_function: | |
1282 | /* FIXME-type-allocation: need a way to free this type when we are | |
1283 | done with it. */ | |
1284 | follow_type = lookup_function_type (follow_type); | |
1285 | break; | |
1286 | } | |
1287 | return follow_type; | |
1288 | } | |
1289 | \f | |
f461f5cf PM |
1290 | /* This function avoids direct calls to fprintf |
1291 | in the parser generated debug code. */ | |
1292 | void | |
1293 | parser_fprintf (FILE *x, const char *y, ...) | |
1294 | { | |
1295 | va_list args; | |
1296 | va_start (args, y); | |
1297 | if (x == stderr) | |
1298 | vfprintf_unfiltered (gdb_stderr, y, args); | |
1299 | else | |
1300 | { | |
1301 | fprintf_unfiltered (gdb_stderr, " Unknown FILE used.\n"); | |
1302 | vfprintf_unfiltered (gdb_stderr, y, args); | |
1303 | } | |
1304 | va_end (args); | |
1305 | } | |
1306 | ||
ac9a91a7 | 1307 | void |
fba45db2 | 1308 | _initialize_parse (void) |
ac9a91a7 JM |
1309 | { |
1310 | type_stack_size = 80; | |
1311 | type_stack_depth = 0; | |
1312 | type_stack = (union type_stack_elt *) | |
1313 | xmalloc (type_stack_size * sizeof (*type_stack)); | |
1314 | ||
85c07804 AC |
1315 | add_setshow_zinteger_cmd ("expression", class_maintenance, |
1316 | &expressiondebug, _("\ | |
1317 | Set expression debugging."), _("\ | |
1318 | Show expression debugging."), _("\ | |
1319 | When non-zero, the internal representation of expressions will be printed."), | |
1320 | NULL, | |
920d2a44 | 1321 | show_expressiondebug, |
85c07804 | 1322 | &setdebuglist, &showdebuglist); |
c906108c | 1323 | } |