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" |
e2305d34 | 56 | |
5f9769d1 PH |
57 | /* Standard set of definitions for printing, dumping, prefixifying, |
58 | * and evaluating expressions. */ | |
59 | ||
60 | const struct exp_descriptor exp_descriptor_standard = | |
61 | { | |
62 | print_subexp_standard, | |
63 | operator_length_standard, | |
64 | op_name_standard, | |
65 | dump_subexp_body_standard, | |
66 | evaluate_subexp_standard | |
67 | }; | |
c906108c SS |
68 | \f |
69 | /* Global variables declared in parser-defs.h (and commented there). */ | |
70 | struct expression *expout; | |
71 | int expout_size; | |
72 | int expout_ptr; | |
73 | struct block *expression_context_block; | |
84f0252a | 74 | CORE_ADDR expression_context_pc; |
c906108c SS |
75 | struct block *innermost_block; |
76 | int arglist_len; | |
77 | union type_stack_elt *type_stack; | |
78 | int type_stack_depth, type_stack_size; | |
79 | char *lexptr; | |
665132f9 | 80 | char *prev_lexptr; |
c906108c SS |
81 | int paren_depth; |
82 | int comma_terminates; | |
3a913e29 | 83 | |
65d12d83 TT |
84 | /* True if parsing an expression to find a field reference. This is |
85 | only used by completion. */ | |
86 | int in_parse_field; | |
87 | ||
88 | /* The index of the last struct expression directly before a '.' or | |
89 | '->'. This is set when parsing and is only used when completing a | |
90 | field name. It is -1 if no dereference operation was found. */ | |
91 | static int expout_last_struct = -1; | |
92 | ||
3a913e29 JB |
93 | /* A temporary buffer for identifiers, so we can null-terminate them. |
94 | ||
95 | We allocate this with xrealloc. parse_exp_1 used to allocate with | |
96 | alloca, using the size of the whole expression as a conservative | |
97 | estimate of the space needed. However, macro expansion can | |
98 | introduce names longer than the original expression; there's no | |
99 | practical way to know beforehand how large that might be. */ | |
100 | char *namecopy; | |
101 | size_t namecopy_size; | |
c906108c | 102 | \f |
c906108c | 103 | static int expressiondebug = 0; |
920d2a44 AC |
104 | static void |
105 | show_expressiondebug (struct ui_file *file, int from_tty, | |
106 | struct cmd_list_element *c, const char *value) | |
107 | { | |
108 | fprintf_filtered (file, _("Expression debugging is %s.\n"), value); | |
109 | } | |
c906108c | 110 | |
74b7792f | 111 | static void free_funcalls (void *ignore); |
c906108c | 112 | |
65d12d83 | 113 | static int prefixify_expression (struct expression *); |
c906108c | 114 | |
65d12d83 TT |
115 | static int prefixify_subexp (struct expression *, struct expression *, int, |
116 | int); | |
c906108c | 117 | |
e85c3284 | 118 | static struct expression *parse_exp_in_context (char **, struct block *, int, |
65d12d83 | 119 | int, int *); |
e85c3284 | 120 | |
a14ed312 | 121 | void _initialize_parse (void); |
392a587b | 122 | |
c906108c SS |
123 | /* Data structure for saving values of arglist_len for function calls whose |
124 | arguments contain other function calls. */ | |
125 | ||
126 | struct funcall | |
127 | { | |
128 | struct funcall *next; | |
129 | int arglist_len; | |
130 | }; | |
131 | ||
132 | static struct funcall *funcall_chain; | |
133 | ||
c906108c SS |
134 | /* Begin counting arguments for a function call, |
135 | saving the data about any containing call. */ | |
136 | ||
137 | void | |
fba45db2 | 138 | start_arglist (void) |
c906108c | 139 | { |
f86f5ca3 | 140 | struct funcall *new; |
c906108c SS |
141 | |
142 | new = (struct funcall *) xmalloc (sizeof (struct funcall)); | |
143 | new->next = funcall_chain; | |
144 | new->arglist_len = arglist_len; | |
145 | arglist_len = 0; | |
146 | funcall_chain = new; | |
147 | } | |
148 | ||
149 | /* Return the number of arguments in a function call just terminated, | |
150 | and restore the data for the containing function call. */ | |
151 | ||
152 | int | |
fba45db2 | 153 | end_arglist (void) |
c906108c | 154 | { |
f86f5ca3 PH |
155 | int val = arglist_len; |
156 | struct funcall *call = funcall_chain; | |
c906108c SS |
157 | funcall_chain = call->next; |
158 | arglist_len = call->arglist_len; | |
b8c9b27d | 159 | xfree (call); |
c906108c SS |
160 | return val; |
161 | } | |
162 | ||
163 | /* Free everything in the funcall chain. | |
164 | Used when there is an error inside parsing. */ | |
165 | ||
166 | static void | |
74b7792f | 167 | free_funcalls (void *ignore) |
c906108c | 168 | { |
f86f5ca3 | 169 | struct funcall *call, *next; |
c906108c SS |
170 | |
171 | for (call = funcall_chain; call; call = next) | |
172 | { | |
173 | next = call->next; | |
b8c9b27d | 174 | xfree (call); |
c906108c SS |
175 | } |
176 | } | |
177 | \f | |
178 | /* This page contains the functions for adding data to the struct expression | |
179 | being constructed. */ | |
180 | ||
181 | /* Add one element to the end of the expression. */ | |
182 | ||
183 | /* To avoid a bug in the Sun 4 compiler, we pass things that can fit into | |
184 | a register through here */ | |
185 | ||
186 | void | |
fba45db2 | 187 | write_exp_elt (union exp_element expelt) |
c906108c SS |
188 | { |
189 | if (expout_ptr >= expout_size) | |
190 | { | |
191 | expout_size *= 2; | |
192 | expout = (struct expression *) | |
193 | xrealloc ((char *) expout, sizeof (struct expression) | |
194 | + EXP_ELEM_TO_BYTES (expout_size)); | |
195 | } | |
196 | expout->elts[expout_ptr++] = expelt; | |
197 | } | |
198 | ||
199 | void | |
fba45db2 | 200 | write_exp_elt_opcode (enum exp_opcode expelt) |
c906108c SS |
201 | { |
202 | union exp_element tmp; | |
09153d55 | 203 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
204 | |
205 | tmp.opcode = expelt; | |
206 | ||
207 | write_exp_elt (tmp); | |
208 | } | |
209 | ||
210 | void | |
fba45db2 | 211 | write_exp_elt_sym (struct symbol *expelt) |
c906108c SS |
212 | { |
213 | union exp_element tmp; | |
09153d55 | 214 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
215 | |
216 | tmp.symbol = expelt; | |
217 | ||
218 | write_exp_elt (tmp); | |
219 | } | |
220 | ||
221 | void | |
fba45db2 | 222 | write_exp_elt_block (struct block *b) |
c906108c SS |
223 | { |
224 | union exp_element tmp; | |
09153d55 | 225 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
226 | tmp.block = b; |
227 | write_exp_elt (tmp); | |
228 | } | |
229 | ||
9e35dae4 DJ |
230 | void |
231 | write_exp_elt_objfile (struct objfile *objfile) | |
232 | { | |
233 | union exp_element tmp; | |
234 | memset (&tmp, 0, sizeof (union exp_element)); | |
235 | tmp.objfile = objfile; | |
236 | write_exp_elt (tmp); | |
237 | } | |
238 | ||
c906108c | 239 | void |
fba45db2 | 240 | write_exp_elt_longcst (LONGEST expelt) |
c906108c SS |
241 | { |
242 | union exp_element tmp; | |
09153d55 | 243 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
244 | |
245 | tmp.longconst = expelt; | |
246 | ||
247 | write_exp_elt (tmp); | |
248 | } | |
249 | ||
250 | void | |
fba45db2 | 251 | write_exp_elt_dblcst (DOUBLEST expelt) |
c906108c SS |
252 | { |
253 | union exp_element tmp; | |
09153d55 | 254 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
255 | |
256 | tmp.doubleconst = expelt; | |
257 | ||
258 | write_exp_elt (tmp); | |
259 | } | |
260 | ||
27bc4d80 TJB |
261 | void |
262 | write_exp_elt_decfloatcst (gdb_byte expelt[16]) | |
263 | { | |
264 | union exp_element tmp; | |
265 | int index; | |
266 | ||
267 | for (index = 0; index < 16; index++) | |
268 | tmp.decfloatconst[index] = expelt[index]; | |
269 | ||
270 | write_exp_elt (tmp); | |
271 | } | |
272 | ||
c906108c | 273 | void |
fba45db2 | 274 | write_exp_elt_type (struct type *expelt) |
c906108c SS |
275 | { |
276 | union exp_element tmp; | |
09153d55 | 277 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
278 | |
279 | tmp.type = expelt; | |
280 | ||
281 | write_exp_elt (tmp); | |
282 | } | |
283 | ||
284 | void | |
fba45db2 | 285 | write_exp_elt_intern (struct internalvar *expelt) |
c906108c SS |
286 | { |
287 | union exp_element tmp; | |
09153d55 | 288 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
289 | |
290 | tmp.internalvar = expelt; | |
291 | ||
292 | write_exp_elt (tmp); | |
293 | } | |
294 | ||
295 | /* Add a string constant to the end of the expression. | |
296 | ||
297 | String constants are stored by first writing an expression element | |
298 | that contains the length of the string, then stuffing the string | |
299 | constant itself into however many expression elements are needed | |
300 | to hold it, and then writing another expression element that contains | |
301 | the length of the string. I.E. an expression element at each end of | |
302 | the string records the string length, so you can skip over the | |
303 | expression elements containing the actual string bytes from either | |
304 | end of the string. Note that this also allows gdb to handle | |
305 | strings with embedded null bytes, as is required for some languages. | |
306 | ||
307 | Don't be fooled by the fact that the string is null byte terminated, | |
308 | this is strictly for the convenience of debugging gdb itself. Gdb | |
309 | Gdb does not depend up the string being null terminated, since the | |
310 | actual length is recorded in expression elements at each end of the | |
311 | string. The null byte is taken into consideration when computing how | |
312 | many expression elements are required to hold the string constant, of | |
313 | course. */ | |
314 | ||
315 | ||
316 | void | |
fba45db2 | 317 | write_exp_string (struct stoken str) |
c906108c | 318 | { |
f86f5ca3 PH |
319 | int len = str.length; |
320 | int lenelt; | |
321 | char *strdata; | |
c906108c SS |
322 | |
323 | /* Compute the number of expression elements required to hold the string | |
324 | (including a null byte terminator), along with one expression element | |
325 | at each end to record the actual string length (not including the | |
326 | null byte terminator). */ | |
327 | ||
328 | lenelt = 2 + BYTES_TO_EXP_ELEM (len + 1); | |
329 | ||
330 | /* Ensure that we have enough available expression elements to store | |
331 | everything. */ | |
332 | ||
333 | if ((expout_ptr + lenelt) >= expout_size) | |
334 | { | |
335 | expout_size = max (expout_size * 2, expout_ptr + lenelt + 10); | |
336 | expout = (struct expression *) | |
337 | xrealloc ((char *) expout, (sizeof (struct expression) | |
338 | + EXP_ELEM_TO_BYTES (expout_size))); | |
339 | } | |
340 | ||
341 | /* Write the leading length expression element (which advances the current | |
342 | expression element index), then write the string constant followed by a | |
343 | terminating null byte, and then write the trailing length expression | |
344 | element. */ | |
345 | ||
346 | write_exp_elt_longcst ((LONGEST) len); | |
347 | strdata = (char *) &expout->elts[expout_ptr]; | |
348 | memcpy (strdata, str.ptr, len); | |
349 | *(strdata + len) = '\0'; | |
350 | expout_ptr += lenelt - 2; | |
351 | write_exp_elt_longcst ((LONGEST) len); | |
352 | } | |
353 | ||
354 | /* Add a bitstring constant to the end of the expression. | |
355 | ||
356 | Bitstring constants are stored by first writing an expression element | |
357 | that contains the length of the bitstring (in bits), then stuffing the | |
358 | bitstring constant itself into however many expression elements are | |
359 | needed to hold it, and then writing another expression element that | |
360 | contains the length of the bitstring. I.E. an expression element at | |
361 | each end of the bitstring records the bitstring length, so you can skip | |
362 | over the expression elements containing the actual bitstring bytes from | |
363 | either end of the bitstring. */ | |
364 | ||
365 | void | |
fba45db2 | 366 | write_exp_bitstring (struct stoken str) |
c906108c | 367 | { |
f86f5ca3 PH |
368 | int bits = str.length; /* length in bits */ |
369 | int len = (bits + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; | |
370 | int lenelt; | |
371 | char *strdata; | |
c906108c SS |
372 | |
373 | /* Compute the number of expression elements required to hold the bitstring, | |
374 | along with one expression element at each end to record the actual | |
375 | bitstring length in bits. */ | |
376 | ||
377 | lenelt = 2 + BYTES_TO_EXP_ELEM (len); | |
378 | ||
379 | /* Ensure that we have enough available expression elements to store | |
380 | everything. */ | |
381 | ||
382 | if ((expout_ptr + lenelt) >= expout_size) | |
383 | { | |
384 | expout_size = max (expout_size * 2, expout_ptr + lenelt + 10); | |
385 | expout = (struct expression *) | |
386 | xrealloc ((char *) expout, (sizeof (struct expression) | |
387 | + EXP_ELEM_TO_BYTES (expout_size))); | |
388 | } | |
389 | ||
390 | /* Write the leading length expression element (which advances the current | |
391 | expression element index), then write the bitstring constant, and then | |
392 | write the trailing length expression element. */ | |
393 | ||
394 | write_exp_elt_longcst ((LONGEST) bits); | |
395 | strdata = (char *) &expout->elts[expout_ptr]; | |
396 | memcpy (strdata, str.ptr, len); | |
397 | expout_ptr += lenelt - 2; | |
398 | write_exp_elt_longcst ((LONGEST) bits); | |
399 | } | |
400 | ||
401 | /* Add the appropriate elements for a minimal symbol to the end of | |
402 | the expression. The rationale behind passing in text_symbol_type and | |
403 | data_symbol_type was so that Modula-2 could pass in WORD for | |
404 | data_symbol_type. Perhaps it still is useful to have those types vary | |
405 | based on the language, but they no longer have names like "int", so | |
406 | the initial rationale is gone. */ | |
407 | ||
c906108c | 408 | void |
a858089e MS |
409 | write_exp_msymbol (struct minimal_symbol *msymbol, |
410 | struct type *text_symbol_type, | |
411 | struct type *data_symbol_type) | |
c906108c | 412 | { |
bccdca4a UW |
413 | struct objfile *objfile = msymbol_objfile (msymbol); |
414 | struct gdbarch *gdbarch = get_objfile_arch (objfile); | |
415 | ||
416 | CORE_ADDR addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
417 | asection *bfd_section = SYMBOL_BFD_SECTION (msymbol); | |
418 | enum minimal_symbol_type type = msymbol->type; | |
419 | CORE_ADDR pc; | |
420 | ||
421 | /* The minimal symbol might point to a function descriptor; | |
422 | resolve it to the actual code address instead. */ | |
423 | pc = gdbarch_convert_from_func_ptr_addr (gdbarch, addr, ¤t_target); | |
424 | if (pc != addr) | |
425 | { | |
426 | /* In this case, assume we have a code symbol instead of | |
427 | a data symbol. */ | |
428 | type = mst_text; | |
429 | bfd_section = NULL; | |
430 | addr = pc; | |
431 | } | |
432 | ||
433 | if (overlay_debugging) | |
434 | addr = symbol_overlayed_address (addr, bfd_section); | |
c906108c SS |
435 | |
436 | write_exp_elt_opcode (OP_LONG); | |
a858089e MS |
437 | /* Let's make the type big enough to hold a 64-bit address. */ |
438 | write_exp_elt_type (builtin_type_CORE_ADDR); | |
c906108c | 439 | write_exp_elt_longcst ((LONGEST) addr); |
c906108c SS |
440 | write_exp_elt_opcode (OP_LONG); |
441 | ||
bccdca4a | 442 | if (bfd_section && bfd_section->flags & SEC_THREAD_LOCAL) |
9e35dae4 | 443 | { |
9e35dae4 | 444 | write_exp_elt_opcode (UNOP_MEMVAL_TLS); |
bccdca4a | 445 | write_exp_elt_objfile (objfile); |
64c50499 | 446 | write_exp_elt_type (builtin_type (gdbarch)->nodebug_tls_symbol); |
9e35dae4 DJ |
447 | write_exp_elt_opcode (UNOP_MEMVAL_TLS); |
448 | return; | |
449 | } | |
450 | ||
c906108c | 451 | write_exp_elt_opcode (UNOP_MEMVAL); |
bccdca4a | 452 | switch (type) |
c906108c SS |
453 | { |
454 | case mst_text: | |
455 | case mst_file_text: | |
456 | case mst_solib_trampoline: | |
64c50499 | 457 | write_exp_elt_type (builtin_type (gdbarch)->nodebug_text_symbol); |
c906108c SS |
458 | break; |
459 | ||
460 | case mst_data: | |
461 | case mst_file_data: | |
462 | case mst_bss: | |
463 | case mst_file_bss: | |
64c50499 | 464 | write_exp_elt_type (builtin_type (gdbarch)->nodebug_data_symbol); |
c906108c SS |
465 | break; |
466 | ||
467 | default: | |
64c50499 | 468 | write_exp_elt_type (builtin_type (gdbarch)->nodebug_unknown_symbol); |
c906108c SS |
469 | break; |
470 | } | |
471 | write_exp_elt_opcode (UNOP_MEMVAL); | |
472 | } | |
65d12d83 TT |
473 | |
474 | /* Mark the current index as the starting location of a structure | |
475 | expression. This is used when completing on field names. */ | |
476 | ||
477 | void | |
478 | mark_struct_expression (void) | |
479 | { | |
480 | expout_last_struct = expout_ptr; | |
481 | } | |
482 | ||
c906108c SS |
483 | \f |
484 | /* Recognize tokens that start with '$'. These include: | |
485 | ||
c5aa993b JM |
486 | $regname A native register name or a "standard |
487 | register name". | |
c906108c | 488 | |
c5aa993b JM |
489 | $variable A convenience variable with a name chosen |
490 | by the user. | |
c906108c | 491 | |
c5aa993b JM |
492 | $digits Value history with index <digits>, starting |
493 | from the first value which has index 1. | |
c906108c | 494 | |
c5aa993b JM |
495 | $$digits Value history with index <digits> relative |
496 | to the last value. I.E. $$0 is the last | |
497 | value, $$1 is the one previous to that, $$2 | |
498 | is the one previous to $$1, etc. | |
c906108c | 499 | |
c5aa993b | 500 | $ | $0 | $$0 The last value in the value history. |
c906108c | 501 | |
c5aa993b JM |
502 | $$ An abbreviation for the second to the last |
503 | value in the value history, I.E. $$1 | |
c906108c | 504 | |
c5aa993b | 505 | */ |
c906108c SS |
506 | |
507 | void | |
fba45db2 | 508 | write_dollar_variable (struct stoken str) |
c906108c | 509 | { |
d7318818 RC |
510 | struct symbol *sym = NULL; |
511 | struct minimal_symbol *msym = NULL; | |
c4a3d09a | 512 | struct internalvar *isym = NULL; |
d7318818 | 513 | |
c906108c SS |
514 | /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1) |
515 | and $$digits (equivalent to $<-digits> if you could type that). */ | |
516 | ||
c906108c SS |
517 | int negate = 0; |
518 | int i = 1; | |
519 | /* Double dollar means negate the number and add -1 as well. | |
520 | Thus $$ alone means -1. */ | |
521 | if (str.length >= 2 && str.ptr[1] == '$') | |
522 | { | |
523 | negate = 1; | |
524 | i = 2; | |
525 | } | |
526 | if (i == str.length) | |
527 | { | |
528 | /* Just dollars (one or two) */ | |
c5aa993b | 529 | i = -negate; |
c906108c SS |
530 | goto handle_last; |
531 | } | |
532 | /* Is the rest of the token digits? */ | |
533 | for (; i < str.length; i++) | |
534 | if (!(str.ptr[i] >= '0' && str.ptr[i] <= '9')) | |
535 | break; | |
536 | if (i == str.length) | |
537 | { | |
538 | i = atoi (str.ptr + 1 + negate); | |
539 | if (negate) | |
c5aa993b | 540 | i = -i; |
c906108c SS |
541 | goto handle_last; |
542 | } | |
c5aa993b | 543 | |
c906108c SS |
544 | /* Handle tokens that refer to machine registers: |
545 | $ followed by a register name. */ | |
206415a3 | 546 | i = frame_map_name_to_regnum (deprecated_safe_get_selected_frame (), |
eb8bc282 | 547 | str.ptr + 1, str.length - 1); |
c5aa993b | 548 | if (i >= 0) |
c906108c SS |
549 | goto handle_register; |
550 | ||
c4a3d09a MF |
551 | /* Any names starting with $ are probably debugger internal variables. */ |
552 | ||
553 | isym = lookup_only_internalvar (copy_name (str) + 1); | |
554 | if (isym) | |
555 | { | |
556 | write_exp_elt_opcode (OP_INTERNALVAR); | |
557 | write_exp_elt_intern (isym); | |
558 | write_exp_elt_opcode (OP_INTERNALVAR); | |
559 | return; | |
560 | } | |
561 | ||
d7318818 RC |
562 | /* On some systems, such as HP-UX and hppa-linux, certain system routines |
563 | have names beginning with $ or $$. Check for those, first. */ | |
564 | ||
565 | sym = lookup_symbol (copy_name (str), (struct block *) NULL, | |
2570f2b7 | 566 | VAR_DOMAIN, (int *) NULL); |
d7318818 RC |
567 | if (sym) |
568 | { | |
569 | write_exp_elt_opcode (OP_VAR_VALUE); | |
570 | write_exp_elt_block (block_found); /* set by lookup_symbol */ | |
571 | write_exp_elt_sym (sym); | |
572 | write_exp_elt_opcode (OP_VAR_VALUE); | |
573 | return; | |
574 | } | |
575 | msym = lookup_minimal_symbol (copy_name (str), NULL, NULL); | |
576 | if (msym) | |
c906108c | 577 | { |
d7318818 RC |
578 | write_exp_msymbol (msym, |
579 | lookup_function_type (builtin_type_int), | |
580 | builtin_type_int); | |
581 | return; | |
c906108c | 582 | } |
c5aa993b | 583 | |
c4a3d09a | 584 | /* Any other names are assumed to be debugger internal variables. */ |
c906108c SS |
585 | |
586 | write_exp_elt_opcode (OP_INTERNALVAR); | |
c4a3d09a | 587 | write_exp_elt_intern (create_internalvar (copy_name (str) + 1)); |
c5aa993b | 588 | write_exp_elt_opcode (OP_INTERNALVAR); |
c906108c | 589 | return; |
c5aa993b | 590 | handle_last: |
c906108c SS |
591 | write_exp_elt_opcode (OP_LAST); |
592 | write_exp_elt_longcst ((LONGEST) i); | |
593 | write_exp_elt_opcode (OP_LAST); | |
594 | return; | |
c5aa993b | 595 | handle_register: |
c906108c | 596 | write_exp_elt_opcode (OP_REGISTER); |
67f3407f DJ |
597 | str.length--; |
598 | str.ptr++; | |
599 | write_exp_string (str); | |
c5aa993b | 600 | write_exp_elt_opcode (OP_REGISTER); |
c906108c SS |
601 | return; |
602 | } | |
603 | ||
604 | ||
c906108c | 605 | char * |
fba45db2 | 606 | find_template_name_end (char *p) |
c906108c SS |
607 | { |
608 | int depth = 1; | |
609 | int just_seen_right = 0; | |
610 | int just_seen_colon = 0; | |
611 | int just_seen_space = 0; | |
c5aa993b | 612 | |
c906108c SS |
613 | if (!p || (*p != '<')) |
614 | return 0; | |
615 | ||
616 | while (*++p) | |
617 | { | |
618 | switch (*p) | |
c5aa993b JM |
619 | { |
620 | case '\'': | |
621 | case '\"': | |
622 | case '{': | |
623 | case '}': | |
624 | /* In future, may want to allow these?? */ | |
625 | return 0; | |
626 | case '<': | |
627 | depth++; /* start nested template */ | |
628 | if (just_seen_colon || just_seen_right || just_seen_space) | |
629 | return 0; /* but not after : or :: or > or space */ | |
630 | break; | |
631 | case '>': | |
632 | if (just_seen_colon || just_seen_right) | |
633 | return 0; /* end a (nested?) template */ | |
634 | just_seen_right = 1; /* but not after : or :: */ | |
635 | if (--depth == 0) /* also disallow >>, insist on > > */ | |
636 | return ++p; /* if outermost ended, return */ | |
637 | break; | |
638 | case ':': | |
639 | if (just_seen_space || (just_seen_colon > 1)) | |
640 | return 0; /* nested class spec coming up */ | |
641 | just_seen_colon++; /* we allow :: but not :::: */ | |
642 | break; | |
643 | case ' ': | |
644 | break; | |
645 | default: | |
646 | if (!((*p >= 'a' && *p <= 'z') || /* allow token chars */ | |
647 | (*p >= 'A' && *p <= 'Z') || | |
648 | (*p >= '0' && *p <= '9') || | |
649 | (*p == '_') || (*p == ',') || /* commas for template args */ | |
650 | (*p == '&') || (*p == '*') || /* pointer and ref types */ | |
651 | (*p == '(') || (*p == ')') || /* function types */ | |
652 | (*p == '[') || (*p == ']'))) /* array types */ | |
653 | return 0; | |
654 | } | |
c906108c | 655 | if (*p != ' ') |
c5aa993b | 656 | just_seen_space = 0; |
c906108c | 657 | if (*p != ':') |
c5aa993b | 658 | just_seen_colon = 0; |
c906108c | 659 | if (*p != '>') |
c5aa993b | 660 | just_seen_right = 0; |
c906108c SS |
661 | } |
662 | return 0; | |
663 | } | |
c5aa993b | 664 | \f |
c906108c SS |
665 | |
666 | ||
c906108c SS |
667 | /* Return a null-terminated temporary copy of the name |
668 | of a string token. */ | |
669 | ||
670 | char * | |
fba45db2 | 671 | copy_name (struct stoken token) |
c906108c | 672 | { |
3a913e29 JB |
673 | /* Make sure there's enough space for the token. */ |
674 | if (namecopy_size < token.length + 1) | |
675 | { | |
676 | namecopy_size = token.length + 1; | |
677 | namecopy = xrealloc (namecopy, token.length + 1); | |
678 | } | |
679 | ||
c906108c SS |
680 | memcpy (namecopy, token.ptr, token.length); |
681 | namecopy[token.length] = 0; | |
3a913e29 | 682 | |
c906108c SS |
683 | return namecopy; |
684 | } | |
685 | \f | |
686 | /* Reverse an expression from suffix form (in which it is constructed) | |
65d12d83 TT |
687 | to prefix form (in which we can conveniently print or execute it). |
688 | Ordinarily this always returns -1. However, if EXPOUT_LAST_STRUCT | |
689 | is not -1 (i.e., we are trying to complete a field name), it will | |
690 | return the index of the subexpression which is the left-hand-side | |
691 | of the struct operation at EXPOUT_LAST_STRUCT. */ | |
c906108c | 692 | |
65d12d83 | 693 | static int |
f86f5ca3 | 694 | prefixify_expression (struct expression *expr) |
c906108c | 695 | { |
df2a60d0 | 696 | int len = sizeof (struct expression) + EXP_ELEM_TO_BYTES (expr->nelts); |
f86f5ca3 PH |
697 | struct expression *temp; |
698 | int inpos = expr->nelts, outpos = 0; | |
c906108c SS |
699 | |
700 | temp = (struct expression *) alloca (len); | |
701 | ||
702 | /* Copy the original expression into temp. */ | |
703 | memcpy (temp, expr, len); | |
704 | ||
65d12d83 | 705 | return prefixify_subexp (temp, expr, inpos, outpos); |
c906108c SS |
706 | } |
707 | ||
24daaebc PH |
708 | /* Return the number of exp_elements in the postfix subexpression |
709 | of EXPR whose operator is at index ENDPOS - 1 in EXPR. */ | |
c906108c SS |
710 | |
711 | int | |
f86f5ca3 | 712 | length_of_subexp (struct expression *expr, int endpos) |
24daaebc PH |
713 | { |
714 | int oplen, args, i; | |
715 | ||
716 | operator_length (expr, endpos, &oplen, &args); | |
717 | ||
718 | while (args > 0) | |
719 | { | |
720 | oplen += length_of_subexp (expr, endpos - oplen); | |
721 | args--; | |
722 | } | |
723 | ||
724 | return oplen; | |
725 | } | |
726 | ||
727 | /* Sets *OPLENP to the length of the operator whose (last) index is | |
728 | ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that | |
729 | operator takes. */ | |
730 | ||
731 | void | |
732 | operator_length (struct expression *expr, int endpos, int *oplenp, int *argsp) | |
5f9769d1 PH |
733 | { |
734 | expr->language_defn->la_exp_desc->operator_length (expr, endpos, | |
735 | oplenp, argsp); | |
736 | } | |
737 | ||
738 | /* Default value for operator_length in exp_descriptor vectors. */ | |
739 | ||
740 | void | |
741 | operator_length_standard (struct expression *expr, int endpos, | |
742 | int *oplenp, int *argsp) | |
c906108c | 743 | { |
f86f5ca3 PH |
744 | int oplen = 1; |
745 | int args = 0; | |
0b4e1325 | 746 | enum f90_range_type range_type; |
f86f5ca3 | 747 | int i; |
c906108c SS |
748 | |
749 | if (endpos < 1) | |
8a3fe4f8 | 750 | error (_("?error in operator_length_standard")); |
c906108c SS |
751 | |
752 | i = (int) expr->elts[endpos - 1].opcode; | |
753 | ||
754 | switch (i) | |
755 | { | |
756 | /* C++ */ | |
757 | case OP_SCOPE: | |
758 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); | |
759 | oplen = 5 + BYTES_TO_EXP_ELEM (oplen + 1); | |
760 | break; | |
761 | ||
762 | case OP_LONG: | |
763 | case OP_DOUBLE: | |
27bc4d80 | 764 | case OP_DECFLOAT: |
c906108c SS |
765 | case OP_VAR_VALUE: |
766 | oplen = 4; | |
767 | break; | |
768 | ||
769 | case OP_TYPE: | |
770 | case OP_BOOL: | |
771 | case OP_LAST: | |
c906108c SS |
772 | case OP_INTERNALVAR: |
773 | oplen = 3; | |
774 | break; | |
775 | ||
776 | case OP_COMPLEX: | |
c5aa993b | 777 | oplen = 1; |
c906108c | 778 | args = 2; |
c5aa993b | 779 | break; |
c906108c SS |
780 | |
781 | case OP_FUNCALL: | |
782 | case OP_F77_UNDETERMINED_ARGLIST: | |
783 | oplen = 3; | |
784 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); | |
785 | break; | |
786 | ||
646df18d | 787 | case OP_OBJC_MSGCALL: /* Objective C message (method) call */ |
53c551b7 AF |
788 | oplen = 4; |
789 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); | |
790 | break; | |
791 | ||
c906108c SS |
792 | case UNOP_MAX: |
793 | case UNOP_MIN: | |
794 | oplen = 3; | |
795 | break; | |
796 | ||
c5aa993b JM |
797 | case BINOP_VAL: |
798 | case UNOP_CAST: | |
799 | case UNOP_MEMVAL: | |
c906108c SS |
800 | oplen = 3; |
801 | args = 1; | |
802 | break; | |
803 | ||
9e35dae4 DJ |
804 | case UNOP_MEMVAL_TLS: |
805 | oplen = 4; | |
806 | args = 1; | |
807 | break; | |
808 | ||
c906108c SS |
809 | case UNOP_ABS: |
810 | case UNOP_CAP: | |
811 | case UNOP_CHR: | |
812 | case UNOP_FLOAT: | |
813 | case UNOP_HIGH: | |
814 | case UNOP_ODD: | |
815 | case UNOP_ORD: | |
816 | case UNOP_TRUNC: | |
817 | oplen = 1; | |
818 | args = 1; | |
819 | break; | |
820 | ||
821 | case OP_LABELED: | |
822 | case STRUCTOP_STRUCT: | |
823 | case STRUCTOP_PTR: | |
824 | args = 1; | |
825 | /* fall through */ | |
67f3407f | 826 | case OP_REGISTER: |
c906108c SS |
827 | case OP_M2_STRING: |
828 | case OP_STRING: | |
646df18d AF |
829 | case OP_OBJC_NSSTRING: /* Objective C Foundation Class NSString constant */ |
830 | case OP_OBJC_SELECTOR: /* Objective C "@selector" pseudo-op */ | |
c906108c | 831 | case OP_NAME: |
c906108c SS |
832 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); |
833 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1); | |
834 | break; | |
835 | ||
836 | case OP_BITSTRING: | |
837 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); | |
838 | oplen = (oplen + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; | |
839 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen); | |
840 | break; | |
841 | ||
842 | case OP_ARRAY: | |
843 | oplen = 4; | |
844 | args = longest_to_int (expr->elts[endpos - 2].longconst); | |
845 | args -= longest_to_int (expr->elts[endpos - 3].longconst); | |
846 | args += 1; | |
847 | break; | |
848 | ||
849 | case TERNOP_COND: | |
850 | case TERNOP_SLICE: | |
851 | case TERNOP_SLICE_COUNT: | |
852 | args = 3; | |
853 | break; | |
854 | ||
855 | /* Modula-2 */ | |
c5aa993b | 856 | case MULTI_SUBSCRIPT: |
c906108c | 857 | oplen = 3; |
c5aa993b | 858 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); |
c906108c SS |
859 | break; |
860 | ||
861 | case BINOP_ASSIGN_MODIFY: | |
862 | oplen = 3; | |
863 | args = 2; | |
864 | break; | |
865 | ||
866 | /* C++ */ | |
867 | case OP_THIS: | |
646df18d | 868 | case OP_OBJC_SELF: |
c906108c SS |
869 | oplen = 2; |
870 | break; | |
871 | ||
0b4e1325 WZ |
872 | case OP_F90_RANGE: |
873 | oplen = 3; | |
874 | ||
875 | range_type = longest_to_int (expr->elts[endpos - 2].longconst); | |
876 | switch (range_type) | |
877 | { | |
878 | case LOW_BOUND_DEFAULT: | |
879 | case HIGH_BOUND_DEFAULT: | |
880 | args = 1; | |
881 | break; | |
882 | case BOTH_BOUND_DEFAULT: | |
883 | args = 0; | |
884 | break; | |
885 | case NONE_BOUND_DEFAULT: | |
886 | args = 2; | |
887 | break; | |
888 | } | |
889 | ||
890 | break; | |
891 | ||
c906108c SS |
892 | default: |
893 | args = 1 + (i < (int) BINOP_END); | |
894 | } | |
895 | ||
24daaebc PH |
896 | *oplenp = oplen; |
897 | *argsp = args; | |
c906108c SS |
898 | } |
899 | ||
900 | /* Copy the subexpression ending just before index INEND in INEXPR | |
901 | into OUTEXPR, starting at index OUTBEG. | |
65d12d83 TT |
902 | In the process, convert it from suffix to prefix form. |
903 | If EXPOUT_LAST_STRUCT is -1, then this function always returns -1. | |
904 | Otherwise, it returns the index of the subexpression which is the | |
905 | left-hand-side of the expression at EXPOUT_LAST_STRUCT. */ | |
c906108c | 906 | |
65d12d83 | 907 | static int |
f86f5ca3 PH |
908 | prefixify_subexp (struct expression *inexpr, |
909 | struct expression *outexpr, int inend, int outbeg) | |
c906108c | 910 | { |
24daaebc PH |
911 | int oplen; |
912 | int args; | |
f86f5ca3 | 913 | int i; |
c906108c SS |
914 | int *arglens; |
915 | enum exp_opcode opcode; | |
65d12d83 | 916 | int result = -1; |
c906108c | 917 | |
24daaebc | 918 | operator_length (inexpr, inend, &oplen, &args); |
c906108c SS |
919 | |
920 | /* Copy the final operator itself, from the end of the input | |
921 | to the beginning of the output. */ | |
922 | inend -= oplen; | |
923 | memcpy (&outexpr->elts[outbeg], &inexpr->elts[inend], | |
924 | EXP_ELEM_TO_BYTES (oplen)); | |
925 | outbeg += oplen; | |
926 | ||
65d12d83 TT |
927 | if (expout_last_struct == inend) |
928 | result = outbeg - oplen; | |
929 | ||
c906108c SS |
930 | /* Find the lengths of the arg subexpressions. */ |
931 | arglens = (int *) alloca (args * sizeof (int)); | |
932 | for (i = args - 1; i >= 0; i--) | |
933 | { | |
934 | oplen = length_of_subexp (inexpr, inend); | |
935 | arglens[i] = oplen; | |
936 | inend -= oplen; | |
937 | } | |
938 | ||
939 | /* Now copy each subexpression, preserving the order of | |
940 | the subexpressions, but prefixifying each one. | |
941 | In this loop, inend starts at the beginning of | |
942 | the expression this level is working on | |
943 | and marches forward over the arguments. | |
944 | outbeg does similarly in the output. */ | |
945 | for (i = 0; i < args; i++) | |
946 | { | |
65d12d83 | 947 | int r; |
c906108c SS |
948 | oplen = arglens[i]; |
949 | inend += oplen; | |
65d12d83 TT |
950 | r = prefixify_subexp (inexpr, outexpr, inend, outbeg); |
951 | if (r != -1) | |
952 | { | |
953 | /* Return immediately. We probably have only parsed a | |
954 | partial expression, so we don't want to try to reverse | |
955 | the other operands. */ | |
956 | return r; | |
957 | } | |
c906108c SS |
958 | outbeg += oplen; |
959 | } | |
65d12d83 TT |
960 | |
961 | return result; | |
c906108c SS |
962 | } |
963 | \f | |
964 | /* This page contains the two entry points to this file. */ | |
965 | ||
966 | /* Read an expression from the string *STRINGPTR points to, | |
967 | parse it, and return a pointer to a struct expression that we malloc. | |
968 | Use block BLOCK as the lexical context for variable names; | |
969 | if BLOCK is zero, use the block of the selected stack frame. | |
970 | Meanwhile, advance *STRINGPTR to point after the expression, | |
971 | at the first nonwhite character that is not part of the expression | |
972 | (possibly a null character). | |
973 | ||
974 | If COMMA is nonzero, stop if a comma is reached. */ | |
975 | ||
976 | struct expression * | |
fba45db2 | 977 | parse_exp_1 (char **stringptr, struct block *block, int comma) |
e85c3284 | 978 | { |
65d12d83 | 979 | return parse_exp_in_context (stringptr, block, comma, 0, NULL); |
e85c3284 PH |
980 | } |
981 | ||
982 | /* As for parse_exp_1, except that if VOID_CONTEXT_P, then | |
65d12d83 TT |
983 | no value is expected from the expression. |
984 | OUT_SUBEXP is set when attempting to complete a field name; in this | |
985 | case it is set to the index of the subexpression on the | |
986 | left-hand-side of the struct op. If not doing such completion, it | |
987 | is left untouched. */ | |
e85c3284 PH |
988 | |
989 | static struct expression * | |
990 | parse_exp_in_context (char **stringptr, struct block *block, int comma, | |
65d12d83 | 991 | int void_context_p, int *out_subexp) |
c906108c | 992 | { |
65d12d83 | 993 | volatile struct gdb_exception except; |
c906108c | 994 | struct cleanup *old_chain; |
65d12d83 | 995 | int subexp; |
c906108c SS |
996 | |
997 | lexptr = *stringptr; | |
665132f9 | 998 | prev_lexptr = NULL; |
c906108c SS |
999 | |
1000 | paren_depth = 0; | |
1001 | type_stack_depth = 0; | |
65d12d83 | 1002 | expout_last_struct = -1; |
c906108c SS |
1003 | |
1004 | comma_terminates = comma; | |
1005 | ||
1006 | if (lexptr == 0 || *lexptr == 0) | |
e2e0b3e5 | 1007 | error_no_arg (_("expression to compute")); |
c906108c | 1008 | |
74b7792f | 1009 | old_chain = make_cleanup (free_funcalls, 0 /*ignore*/); |
c906108c SS |
1010 | funcall_chain = 0; |
1011 | ||
d705c43c | 1012 | expression_context_block = block; |
59f92a09 | 1013 | |
d705c43c PA |
1014 | /* If no context specified, try using the current frame, if any. */ |
1015 | if (!expression_context_block) | |
1016 | expression_context_block = get_selected_block (&expression_context_pc); | |
1017 | else | |
1018 | expression_context_pc = BLOCK_START (expression_context_block); | |
59f92a09 | 1019 | |
d705c43c | 1020 | /* Fall back to using the current source static context, if any. */ |
59f92a09 | 1021 | |
d705c43c | 1022 | if (!expression_context_block) |
59f92a09 FF |
1023 | { |
1024 | struct symtab_and_line cursal = get_current_source_symtab_and_line (); | |
1025 | if (cursal.symtab) | |
d705c43c PA |
1026 | expression_context_block |
1027 | = BLOCKVECTOR_BLOCK (BLOCKVECTOR (cursal.symtab), STATIC_BLOCK); | |
1028 | if (expression_context_block) | |
1029 | expression_context_pc = BLOCK_START (expression_context_block); | |
84f0252a | 1030 | } |
c906108c | 1031 | |
c906108c SS |
1032 | expout_size = 10; |
1033 | expout_ptr = 0; | |
1034 | expout = (struct expression *) | |
1035 | xmalloc (sizeof (struct expression) + EXP_ELEM_TO_BYTES (expout_size)); | |
1036 | expout->language_defn = current_language; | |
c906108c | 1037 | |
65d12d83 TT |
1038 | TRY_CATCH (except, RETURN_MASK_ALL) |
1039 | { | |
1040 | if (current_language->la_parser ()) | |
1041 | current_language->la_error (NULL); | |
1042 | } | |
1043 | if (except.reason < 0) | |
1044 | { | |
1045 | if (! in_parse_field) | |
1046 | { | |
1047 | xfree (expout); | |
1048 | throw_exception (except); | |
1049 | } | |
1050 | } | |
c906108c SS |
1051 | |
1052 | discard_cleanups (old_chain); | |
1053 | ||
1054 | /* Record the actual number of expression elements, and then | |
1055 | reallocate the expression memory so that we free up any | |
1056 | excess elements. */ | |
1057 | ||
1058 | expout->nelts = expout_ptr; | |
1059 | expout = (struct expression *) | |
1060 | xrealloc ((char *) expout, | |
1061 | sizeof (struct expression) + EXP_ELEM_TO_BYTES (expout_ptr));; | |
1062 | ||
1063 | /* Convert expression from postfix form as generated by yacc | |
1064 | parser, to a prefix form. */ | |
1065 | ||
c906108c | 1066 | if (expressiondebug) |
24daaebc PH |
1067 | dump_raw_expression (expout, gdb_stdlog, |
1068 | "before conversion to prefix form"); | |
c906108c | 1069 | |
65d12d83 TT |
1070 | subexp = prefixify_expression (expout); |
1071 | if (out_subexp) | |
1072 | *out_subexp = subexp; | |
c906108c | 1073 | |
e85c3284 PH |
1074 | current_language->la_post_parser (&expout, void_context_p); |
1075 | ||
c906108c | 1076 | if (expressiondebug) |
24daaebc | 1077 | dump_prefix_expression (expout, gdb_stdlog); |
c906108c SS |
1078 | |
1079 | *stringptr = lexptr; | |
1080 | return expout; | |
1081 | } | |
1082 | ||
1083 | /* Parse STRING as an expression, and complain if this fails | |
1084 | to use up all of the contents of STRING. */ | |
1085 | ||
1086 | struct expression * | |
fba45db2 | 1087 | parse_expression (char *string) |
c906108c | 1088 | { |
f86f5ca3 | 1089 | struct expression *exp; |
c906108c SS |
1090 | exp = parse_exp_1 (&string, 0, 0); |
1091 | if (*string) | |
8a3fe4f8 | 1092 | error (_("Junk after end of expression.")); |
c906108c SS |
1093 | return exp; |
1094 | } | |
e85c3284 | 1095 | |
65d12d83 TT |
1096 | /* Parse STRING as an expression. If parsing ends in the middle of a |
1097 | field reference, return the type of the left-hand-side of the | |
1098 | reference; furthermore, if the parsing ends in the field name, | |
1099 | return the field name in *NAME. In all other cases, return NULL. */ | |
1100 | ||
1101 | struct type * | |
1102 | parse_field_expression (char *string, char **name) | |
1103 | { | |
1104 | struct expression *exp = NULL; | |
1105 | struct value *val; | |
1106 | int subexp; | |
1107 | volatile struct gdb_exception except; | |
1108 | ||
1109 | TRY_CATCH (except, RETURN_MASK_ALL) | |
1110 | { | |
1111 | in_parse_field = 1; | |
1112 | exp = parse_exp_in_context (&string, 0, 0, 0, &subexp); | |
1113 | } | |
1114 | in_parse_field = 0; | |
1115 | if (except.reason < 0 || ! exp) | |
1116 | return NULL; | |
1117 | if (expout_last_struct == -1) | |
1118 | { | |
1119 | xfree (exp); | |
1120 | return NULL; | |
1121 | } | |
1122 | ||
1123 | *name = extract_field_op (exp, &subexp); | |
1124 | if (!*name) | |
1125 | { | |
1126 | xfree (exp); | |
1127 | return NULL; | |
1128 | } | |
1129 | val = evaluate_subexpression_type (exp, subexp); | |
1130 | xfree (exp); | |
1131 | ||
1132 | return value_type (val); | |
1133 | } | |
1134 | ||
e85c3284 PH |
1135 | /* A post-parser that does nothing */ |
1136 | ||
e85c3284 PH |
1137 | void |
1138 | null_post_parser (struct expression **exp, int void_context_p) | |
1139 | { | |
1140 | } | |
c906108c SS |
1141 | \f |
1142 | /* Stuff for maintaining a stack of types. Currently just used by C, but | |
1143 | probably useful for any language which declares its types "backwards". */ | |
1144 | ||
47663de5 MS |
1145 | static void |
1146 | check_type_stack_depth (void) | |
c906108c SS |
1147 | { |
1148 | if (type_stack_depth == type_stack_size) | |
1149 | { | |
1150 | type_stack_size *= 2; | |
1151 | type_stack = (union type_stack_elt *) | |
1152 | xrealloc ((char *) type_stack, type_stack_size * sizeof (*type_stack)); | |
1153 | } | |
47663de5 MS |
1154 | } |
1155 | ||
1156 | void | |
1157 | push_type (enum type_pieces tp) | |
1158 | { | |
1159 | check_type_stack_depth (); | |
c906108c SS |
1160 | type_stack[type_stack_depth++].piece = tp; |
1161 | } | |
1162 | ||
1163 | void | |
fba45db2 | 1164 | push_type_int (int n) |
c906108c | 1165 | { |
47663de5 | 1166 | check_type_stack_depth (); |
c906108c SS |
1167 | type_stack[type_stack_depth++].int_val = n; |
1168 | } | |
1169 | ||
47663de5 MS |
1170 | void |
1171 | push_type_address_space (char *string) | |
1172 | { | |
1173 | push_type_int (address_space_name_to_int (string)); | |
1174 | } | |
1175 | ||
c5aa993b | 1176 | enum type_pieces |
fba45db2 | 1177 | pop_type (void) |
c906108c SS |
1178 | { |
1179 | if (type_stack_depth) | |
1180 | return type_stack[--type_stack_depth].piece; | |
1181 | return tp_end; | |
1182 | } | |
1183 | ||
1184 | int | |
fba45db2 | 1185 | pop_type_int (void) |
c906108c SS |
1186 | { |
1187 | if (type_stack_depth) | |
1188 | return type_stack[--type_stack_depth].int_val; | |
1189 | /* "Can't happen". */ | |
1190 | return 0; | |
1191 | } | |
1192 | ||
1193 | /* Pop the type stack and return the type which corresponds to FOLLOW_TYPE | |
1194 | as modified by all the stuff on the stack. */ | |
1195 | struct type * | |
fba45db2 | 1196 | follow_types (struct type *follow_type) |
c906108c SS |
1197 | { |
1198 | int done = 0; | |
2e2394a0 MS |
1199 | int make_const = 0; |
1200 | int make_volatile = 0; | |
47663de5 | 1201 | int make_addr_space = 0; |
c906108c SS |
1202 | int array_size; |
1203 | struct type *range_type; | |
1204 | ||
1205 | while (!done) | |
1206 | switch (pop_type ()) | |
1207 | { | |
1208 | case tp_end: | |
1209 | done = 1; | |
2e2394a0 MS |
1210 | if (make_const) |
1211 | follow_type = make_cv_type (make_const, | |
1212 | TYPE_VOLATILE (follow_type), | |
1213 | follow_type, 0); | |
1214 | if (make_volatile) | |
1215 | follow_type = make_cv_type (TYPE_CONST (follow_type), | |
1216 | make_volatile, | |
1217 | follow_type, 0); | |
47663de5 MS |
1218 | if (make_addr_space) |
1219 | follow_type = make_type_with_address_space (follow_type, | |
1220 | make_addr_space); | |
1221 | make_const = make_volatile = 0; | |
1222 | make_addr_space = 0; | |
2e2394a0 MS |
1223 | break; |
1224 | case tp_const: | |
1225 | make_const = 1; | |
1226 | break; | |
1227 | case tp_volatile: | |
1228 | make_volatile = 1; | |
c906108c | 1229 | break; |
47663de5 MS |
1230 | case tp_space_identifier: |
1231 | make_addr_space = pop_type_int (); | |
1232 | break; | |
c906108c SS |
1233 | case tp_pointer: |
1234 | follow_type = lookup_pointer_type (follow_type); | |
2e2394a0 MS |
1235 | if (make_const) |
1236 | follow_type = make_cv_type (make_const, | |
1237 | TYPE_VOLATILE (follow_type), | |
1238 | follow_type, 0); | |
1239 | if (make_volatile) | |
1240 | follow_type = make_cv_type (TYPE_CONST (follow_type), | |
1241 | make_volatile, | |
1242 | follow_type, 0); | |
47663de5 MS |
1243 | if (make_addr_space) |
1244 | follow_type = make_type_with_address_space (follow_type, | |
1245 | make_addr_space); | |
2e2394a0 | 1246 | make_const = make_volatile = 0; |
47663de5 | 1247 | make_addr_space = 0; |
c906108c SS |
1248 | break; |
1249 | case tp_reference: | |
1250 | follow_type = lookup_reference_type (follow_type); | |
2e2394a0 | 1251 | if (make_const) |
47663de5 MS |
1252 | follow_type = make_cv_type (make_const, |
1253 | TYPE_VOLATILE (follow_type), | |
1254 | follow_type, 0); | |
2e2394a0 | 1255 | if (make_volatile) |
47663de5 MS |
1256 | follow_type = make_cv_type (TYPE_CONST (follow_type), |
1257 | make_volatile, | |
1258 | follow_type, 0); | |
1259 | if (make_addr_space) | |
1260 | follow_type = make_type_with_address_space (follow_type, | |
1261 | make_addr_space); | |
2e2394a0 | 1262 | make_const = make_volatile = 0; |
47663de5 | 1263 | make_addr_space = 0; |
c906108c SS |
1264 | break; |
1265 | case tp_array: | |
1266 | array_size = pop_type_int (); | |
1267 | /* FIXME-type-allocation: need a way to free this type when we are | |
1268 | done with it. */ | |
1269 | range_type = | |
1270 | create_range_type ((struct type *) NULL, | |
1271 | builtin_type_int, 0, | |
1272 | array_size >= 0 ? array_size - 1 : 0); | |
1273 | follow_type = | |
1274 | create_array_type ((struct type *) NULL, | |
1275 | follow_type, range_type); | |
1276 | if (array_size < 0) | |
c5aa993b | 1277 | TYPE_ARRAY_UPPER_BOUND_TYPE (follow_type) |
c906108c SS |
1278 | = BOUND_CANNOT_BE_DETERMINED; |
1279 | break; | |
1280 | case tp_function: | |
1281 | /* FIXME-type-allocation: need a way to free this type when we are | |
1282 | done with it. */ | |
1283 | follow_type = lookup_function_type (follow_type); | |
1284 | break; | |
1285 | } | |
1286 | return follow_type; | |
1287 | } | |
1288 | \f | |
f461f5cf PM |
1289 | /* This function avoids direct calls to fprintf |
1290 | in the parser generated debug code. */ | |
1291 | void | |
1292 | parser_fprintf (FILE *x, const char *y, ...) | |
1293 | { | |
1294 | va_list args; | |
1295 | va_start (args, y); | |
1296 | if (x == stderr) | |
1297 | vfprintf_unfiltered (gdb_stderr, y, args); | |
1298 | else | |
1299 | { | |
1300 | fprintf_unfiltered (gdb_stderr, " Unknown FILE used.\n"); | |
1301 | vfprintf_unfiltered (gdb_stderr, y, args); | |
1302 | } | |
1303 | va_end (args); | |
1304 | } | |
1305 | ||
ac9a91a7 | 1306 | void |
fba45db2 | 1307 | _initialize_parse (void) |
ac9a91a7 JM |
1308 | { |
1309 | type_stack_size = 80; | |
1310 | type_stack_depth = 0; | |
1311 | type_stack = (union type_stack_elt *) | |
1312 | xmalloc (type_stack_size * sizeof (*type_stack)); | |
1313 | ||
85c07804 AC |
1314 | add_setshow_zinteger_cmd ("expression", class_maintenance, |
1315 | &expressiondebug, _("\ | |
1316 | Set expression debugging."), _("\ | |
1317 | Show expression debugging."), _("\ | |
1318 | When non-zero, the internal representation of expressions will be printed."), | |
1319 | NULL, | |
920d2a44 | 1320 | show_expressiondebug, |
85c07804 | 1321 | &setdebuglist, &showdebuglist); |
c906108c | 1322 | } |