Commit | Line | Data |
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c906108c | 1 | /* Parse expressions for GDB. |
c4a172b5 | 2 | |
6aba47ca | 3 | Copyright (C) 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, |
4c38e0a4 | 4 | 1998, 1999, 2000, 2001, 2004, 2005, 2007, 2008, 2009, 2010 |
9b254dd1 | 5 | Free Software Foundation, Inc. |
c4a172b5 | 6 | |
c906108c SS |
7 | Modified from expread.y by the Department of Computer Science at the |
8 | State University of New York at Buffalo, 1991. | |
9 | ||
c5aa993b | 10 | This file is part of GDB. |
c906108c | 11 | |
c5aa993b JM |
12 | This program is free software; you can redistribute it and/or modify |
13 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 14 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 15 | (at your option) any later version. |
c906108c | 16 | |
c5aa993b JM |
17 | This program is distributed in the hope that it will be useful, |
18 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | GNU General Public License for more details. | |
c906108c | 21 | |
c5aa993b | 22 | You should have received a copy of the GNU General Public License |
a9762ec7 | 23 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
24 | |
25 | /* Parse an expression from text in a string, | |
26 | and return the result as a struct expression pointer. | |
27 | That structure contains arithmetic operations in reverse polish, | |
28 | with constants represented by operations that are followed by special data. | |
29 | See expression.h for the details of the format. | |
30 | What is important here is that it can be built up sequentially | |
31 | during the process of parsing; the lower levels of the tree always | |
32 | come first in the result. */ | |
c5aa993b | 33 | |
c906108c | 34 | #include "defs.h" |
12c89474 | 35 | #include <ctype.h> |
e17c207e | 36 | #include "arch-utils.h" |
c906108c | 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, | |
c0201579 | 65 | operator_check_standard, |
5f9769d1 PH |
66 | op_name_standard, |
67 | dump_subexp_body_standard, | |
68 | evaluate_subexp_standard | |
69 | }; | |
c906108c SS |
70 | \f |
71 | /* Global variables declared in parser-defs.h (and commented there). */ | |
72 | struct expression *expout; | |
73 | int expout_size; | |
74 | int expout_ptr; | |
75 | struct block *expression_context_block; | |
84f0252a | 76 | CORE_ADDR expression_context_pc; |
c906108c SS |
77 | struct block *innermost_block; |
78 | int arglist_len; | |
79 | union type_stack_elt *type_stack; | |
80 | int type_stack_depth, type_stack_size; | |
81 | char *lexptr; | |
665132f9 | 82 | char *prev_lexptr; |
c906108c SS |
83 | int paren_depth; |
84 | int comma_terminates; | |
3a913e29 | 85 | |
65d12d83 TT |
86 | /* True if parsing an expression to find a field reference. This is |
87 | only used by completion. */ | |
88 | int in_parse_field; | |
89 | ||
90 | /* The index of the last struct expression directly before a '.' or | |
91 | '->'. This is set when parsing and is only used when completing a | |
92 | field name. It is -1 if no dereference operation was found. */ | |
93 | static int expout_last_struct = -1; | |
94 | ||
3a913e29 JB |
95 | /* A temporary buffer for identifiers, so we can null-terminate them. |
96 | ||
97 | We allocate this with xrealloc. parse_exp_1 used to allocate with | |
98 | alloca, using the size of the whole expression as a conservative | |
99 | estimate of the space needed. However, macro expansion can | |
100 | introduce names longer than the original expression; there's no | |
101 | practical way to know beforehand how large that might be. */ | |
102 | char *namecopy; | |
103 | size_t namecopy_size; | |
c906108c | 104 | \f |
c906108c | 105 | static int expressiondebug = 0; |
920d2a44 AC |
106 | static void |
107 | show_expressiondebug (struct ui_file *file, int from_tty, | |
108 | struct cmd_list_element *c, const char *value) | |
109 | { | |
110 | fprintf_filtered (file, _("Expression debugging is %s.\n"), value); | |
111 | } | |
c906108c | 112 | |
92981e24 TT |
113 | |
114 | /* Non-zero if an expression parser should set yydebug. */ | |
115 | int parser_debug; | |
116 | ||
117 | static void | |
118 | show_parserdebug (struct ui_file *file, int from_tty, | |
119 | struct cmd_list_element *c, const char *value) | |
120 | { | |
121 | fprintf_filtered (file, _("Parser debugging is %s.\n"), value); | |
122 | } | |
123 | ||
124 | ||
74b7792f | 125 | static void free_funcalls (void *ignore); |
c906108c | 126 | |
65d12d83 | 127 | static int prefixify_expression (struct expression *); |
c906108c | 128 | |
65d12d83 TT |
129 | static int prefixify_subexp (struct expression *, struct expression *, int, |
130 | int); | |
c906108c | 131 | |
e85c3284 | 132 | static struct expression *parse_exp_in_context (char **, struct block *, int, |
65d12d83 | 133 | int, int *); |
e85c3284 | 134 | |
a14ed312 | 135 | void _initialize_parse (void); |
392a587b | 136 | |
c906108c SS |
137 | /* Data structure for saving values of arglist_len for function calls whose |
138 | arguments contain other function calls. */ | |
139 | ||
140 | struct funcall | |
141 | { | |
142 | struct funcall *next; | |
143 | int arglist_len; | |
144 | }; | |
145 | ||
146 | static struct funcall *funcall_chain; | |
147 | ||
c906108c SS |
148 | /* Begin counting arguments for a function call, |
149 | saving the data about any containing call. */ | |
150 | ||
151 | void | |
fba45db2 | 152 | start_arglist (void) |
c906108c | 153 | { |
f86f5ca3 | 154 | struct funcall *new; |
c906108c SS |
155 | |
156 | new = (struct funcall *) xmalloc (sizeof (struct funcall)); | |
157 | new->next = funcall_chain; | |
158 | new->arglist_len = arglist_len; | |
159 | arglist_len = 0; | |
160 | funcall_chain = new; | |
161 | } | |
162 | ||
163 | /* Return the number of arguments in a function call just terminated, | |
164 | and restore the data for the containing function call. */ | |
165 | ||
166 | int | |
fba45db2 | 167 | end_arglist (void) |
c906108c | 168 | { |
f86f5ca3 PH |
169 | int val = arglist_len; |
170 | struct funcall *call = funcall_chain; | |
ad3bbd48 | 171 | |
c906108c SS |
172 | funcall_chain = call->next; |
173 | arglist_len = call->arglist_len; | |
b8c9b27d | 174 | xfree (call); |
c906108c SS |
175 | return val; |
176 | } | |
177 | ||
178 | /* Free everything in the funcall chain. | |
179 | Used when there is an error inside parsing. */ | |
180 | ||
181 | static void | |
74b7792f | 182 | free_funcalls (void *ignore) |
c906108c | 183 | { |
f86f5ca3 | 184 | struct funcall *call, *next; |
c906108c SS |
185 | |
186 | for (call = funcall_chain; call; call = next) | |
187 | { | |
188 | next = call->next; | |
b8c9b27d | 189 | xfree (call); |
c906108c SS |
190 | } |
191 | } | |
192 | \f | |
193 | /* This page contains the functions for adding data to the struct expression | |
194 | being constructed. */ | |
195 | ||
196 | /* Add one element to the end of the expression. */ | |
197 | ||
198 | /* To avoid a bug in the Sun 4 compiler, we pass things that can fit into | |
199 | a register through here */ | |
200 | ||
201 | void | |
fba45db2 | 202 | write_exp_elt (union exp_element expelt) |
c906108c SS |
203 | { |
204 | if (expout_ptr >= expout_size) | |
205 | { | |
206 | expout_size *= 2; | |
207 | expout = (struct expression *) | |
208 | xrealloc ((char *) expout, sizeof (struct expression) | |
209 | + EXP_ELEM_TO_BYTES (expout_size)); | |
210 | } | |
211 | expout->elts[expout_ptr++] = expelt; | |
212 | } | |
213 | ||
214 | void | |
fba45db2 | 215 | write_exp_elt_opcode (enum exp_opcode expelt) |
c906108c SS |
216 | { |
217 | union exp_element tmp; | |
218 | ||
ad3bbd48 | 219 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c | 220 | tmp.opcode = expelt; |
c906108c SS |
221 | write_exp_elt (tmp); |
222 | } | |
223 | ||
224 | void | |
fba45db2 | 225 | write_exp_elt_sym (struct symbol *expelt) |
c906108c SS |
226 | { |
227 | union exp_element tmp; | |
228 | ||
ad3bbd48 | 229 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c | 230 | tmp.symbol = expelt; |
c906108c SS |
231 | write_exp_elt (tmp); |
232 | } | |
233 | ||
234 | void | |
fba45db2 | 235 | write_exp_elt_block (struct block *b) |
c906108c SS |
236 | { |
237 | union exp_element tmp; | |
ad3bbd48 | 238 | |
09153d55 | 239 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
240 | tmp.block = b; |
241 | write_exp_elt (tmp); | |
242 | } | |
243 | ||
9e35dae4 DJ |
244 | void |
245 | write_exp_elt_objfile (struct objfile *objfile) | |
246 | { | |
247 | union exp_element tmp; | |
ad3bbd48 | 248 | |
9e35dae4 DJ |
249 | memset (&tmp, 0, sizeof (union exp_element)); |
250 | tmp.objfile = objfile; | |
251 | write_exp_elt (tmp); | |
252 | } | |
253 | ||
c906108c | 254 | void |
fba45db2 | 255 | write_exp_elt_longcst (LONGEST expelt) |
c906108c SS |
256 | { |
257 | union exp_element tmp; | |
258 | ||
ad3bbd48 | 259 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c | 260 | tmp.longconst = expelt; |
c906108c SS |
261 | write_exp_elt (tmp); |
262 | } | |
263 | ||
264 | void | |
fba45db2 | 265 | write_exp_elt_dblcst (DOUBLEST expelt) |
c906108c SS |
266 | { |
267 | union exp_element tmp; | |
268 | ||
ad3bbd48 | 269 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c | 270 | tmp.doubleconst = expelt; |
c906108c SS |
271 | write_exp_elt (tmp); |
272 | } | |
273 | ||
27bc4d80 TJB |
274 | void |
275 | write_exp_elt_decfloatcst (gdb_byte expelt[16]) | |
276 | { | |
277 | union exp_element tmp; | |
278 | int index; | |
279 | ||
280 | for (index = 0; index < 16; index++) | |
281 | tmp.decfloatconst[index] = expelt[index]; | |
282 | ||
283 | write_exp_elt (tmp); | |
284 | } | |
285 | ||
c906108c | 286 | void |
fba45db2 | 287 | write_exp_elt_type (struct type *expelt) |
c906108c SS |
288 | { |
289 | union exp_element tmp; | |
290 | ||
ad3bbd48 | 291 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c | 292 | tmp.type = expelt; |
c906108c SS |
293 | write_exp_elt (tmp); |
294 | } | |
295 | ||
296 | void | |
fba45db2 | 297 | write_exp_elt_intern (struct internalvar *expelt) |
c906108c SS |
298 | { |
299 | union exp_element tmp; | |
300 | ||
ad3bbd48 | 301 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c | 302 | tmp.internalvar = expelt; |
c906108c SS |
303 | write_exp_elt (tmp); |
304 | } | |
305 | ||
306 | /* Add a string constant to the end of the expression. | |
307 | ||
308 | String constants are stored by first writing an expression element | |
309 | that contains the length of the string, then stuffing the string | |
310 | constant itself into however many expression elements are needed | |
311 | to hold it, and then writing another expression element that contains | |
312 | the length of the string. I.E. an expression element at each end of | |
313 | the string records the string length, so you can skip over the | |
314 | expression elements containing the actual string bytes from either | |
315 | end of the string. Note that this also allows gdb to handle | |
316 | strings with embedded null bytes, as is required for some languages. | |
317 | ||
318 | Don't be fooled by the fact that the string is null byte terminated, | |
bc3b79fd | 319 | this is strictly for the convenience of debugging gdb itself. |
c906108c SS |
320 | Gdb does not depend up the string being null terminated, since the |
321 | actual length is recorded in expression elements at each end of the | |
322 | string. The null byte is taken into consideration when computing how | |
323 | many expression elements are required to hold the string constant, of | |
324 | course. */ | |
325 | ||
326 | ||
327 | void | |
fba45db2 | 328 | write_exp_string (struct stoken str) |
c906108c | 329 | { |
f86f5ca3 PH |
330 | int len = str.length; |
331 | int lenelt; | |
332 | char *strdata; | |
c906108c SS |
333 | |
334 | /* Compute the number of expression elements required to hold the string | |
335 | (including a null byte terminator), along with one expression element | |
336 | at each end to record the actual string length (not including the | |
337 | null byte terminator). */ | |
338 | ||
339 | lenelt = 2 + BYTES_TO_EXP_ELEM (len + 1); | |
340 | ||
341 | /* Ensure that we have enough available expression elements to store | |
342 | everything. */ | |
343 | ||
344 | if ((expout_ptr + lenelt) >= expout_size) | |
345 | { | |
346 | expout_size = max (expout_size * 2, expout_ptr + lenelt + 10); | |
347 | expout = (struct expression *) | |
348 | xrealloc ((char *) expout, (sizeof (struct expression) | |
349 | + EXP_ELEM_TO_BYTES (expout_size))); | |
350 | } | |
351 | ||
352 | /* Write the leading length expression element (which advances the current | |
353 | expression element index), then write the string constant followed by a | |
354 | terminating null byte, and then write the trailing length expression | |
355 | element. */ | |
356 | ||
357 | write_exp_elt_longcst ((LONGEST) len); | |
358 | strdata = (char *) &expout->elts[expout_ptr]; | |
359 | memcpy (strdata, str.ptr, len); | |
360 | *(strdata + len) = '\0'; | |
361 | expout_ptr += lenelt - 2; | |
362 | write_exp_elt_longcst ((LONGEST) len); | |
363 | } | |
364 | ||
6c7a06a3 TT |
365 | /* Add a vector of string constants to the end of the expression. |
366 | ||
367 | This adds an OP_STRING operation, but encodes the contents | |
368 | differently from write_exp_string. The language is expected to | |
369 | handle evaluation of this expression itself. | |
370 | ||
371 | After the usual OP_STRING header, TYPE is written into the | |
372 | expression as a long constant. The interpretation of this field is | |
373 | up to the language evaluator. | |
374 | ||
375 | Next, each string in VEC is written. The length is written as a | |
376 | long constant, followed by the contents of the string. */ | |
377 | ||
378 | void | |
379 | write_exp_string_vector (int type, struct stoken_vector *vec) | |
380 | { | |
381 | int i, n_slots, len; | |
382 | ||
383 | /* Compute the size. We compute the size in number of slots to | |
384 | avoid issues with string padding. */ | |
385 | n_slots = 0; | |
386 | for (i = 0; i < vec->len; ++i) | |
387 | { | |
388 | /* One slot for the length of this element, plus the number of | |
389 | slots needed for this string. */ | |
390 | n_slots += 1 + BYTES_TO_EXP_ELEM (vec->tokens[i].length); | |
391 | } | |
392 | ||
393 | /* One more slot for the type of the string. */ | |
394 | ++n_slots; | |
395 | ||
396 | /* Now compute a phony string length. */ | |
397 | len = EXP_ELEM_TO_BYTES (n_slots) - 1; | |
398 | ||
399 | n_slots += 4; | |
400 | if ((expout_ptr + n_slots) >= expout_size) | |
401 | { | |
402 | expout_size = max (expout_size * 2, expout_ptr + n_slots + 10); | |
403 | expout = (struct expression *) | |
404 | xrealloc ((char *) expout, (sizeof (struct expression) | |
405 | + EXP_ELEM_TO_BYTES (expout_size))); | |
406 | } | |
407 | ||
408 | write_exp_elt_opcode (OP_STRING); | |
409 | write_exp_elt_longcst (len); | |
410 | write_exp_elt_longcst (type); | |
411 | ||
412 | for (i = 0; i < vec->len; ++i) | |
413 | { | |
414 | write_exp_elt_longcst (vec->tokens[i].length); | |
415 | memcpy (&expout->elts[expout_ptr], vec->tokens[i].ptr, | |
416 | vec->tokens[i].length); | |
417 | expout_ptr += BYTES_TO_EXP_ELEM (vec->tokens[i].length); | |
418 | } | |
419 | ||
420 | write_exp_elt_longcst (len); | |
421 | write_exp_elt_opcode (OP_STRING); | |
422 | } | |
423 | ||
c906108c SS |
424 | /* Add a bitstring constant to the end of the expression. |
425 | ||
426 | Bitstring constants are stored by first writing an expression element | |
427 | that contains the length of the bitstring (in bits), then stuffing the | |
428 | bitstring constant itself into however many expression elements are | |
429 | needed to hold it, and then writing another expression element that | |
430 | contains the length of the bitstring. I.E. an expression element at | |
431 | each end of the bitstring records the bitstring length, so you can skip | |
432 | over the expression elements containing the actual bitstring bytes from | |
433 | either end of the bitstring. */ | |
434 | ||
435 | void | |
fba45db2 | 436 | write_exp_bitstring (struct stoken str) |
c906108c | 437 | { |
f86f5ca3 PH |
438 | int bits = str.length; /* length in bits */ |
439 | int len = (bits + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; | |
440 | int lenelt; | |
441 | char *strdata; | |
c906108c SS |
442 | |
443 | /* Compute the number of expression elements required to hold the bitstring, | |
444 | along with one expression element at each end to record the actual | |
445 | bitstring length in bits. */ | |
446 | ||
447 | lenelt = 2 + BYTES_TO_EXP_ELEM (len); | |
448 | ||
449 | /* Ensure that we have enough available expression elements to store | |
450 | everything. */ | |
451 | ||
452 | if ((expout_ptr + lenelt) >= expout_size) | |
453 | { | |
454 | expout_size = max (expout_size * 2, expout_ptr + lenelt + 10); | |
455 | expout = (struct expression *) | |
456 | xrealloc ((char *) expout, (sizeof (struct expression) | |
457 | + EXP_ELEM_TO_BYTES (expout_size))); | |
458 | } | |
459 | ||
460 | /* Write the leading length expression element (which advances the current | |
461 | expression element index), then write the bitstring constant, and then | |
462 | write the trailing length expression element. */ | |
463 | ||
464 | write_exp_elt_longcst ((LONGEST) bits); | |
465 | strdata = (char *) &expout->elts[expout_ptr]; | |
466 | memcpy (strdata, str.ptr, len); | |
467 | expout_ptr += lenelt - 2; | |
468 | write_exp_elt_longcst ((LONGEST) bits); | |
469 | } | |
470 | ||
471 | /* Add the appropriate elements for a minimal symbol to the end of | |
c841afd5 | 472 | the expression. */ |
c906108c | 473 | |
c906108c | 474 | void |
c841afd5 | 475 | write_exp_msymbol (struct minimal_symbol *msymbol) |
c906108c | 476 | { |
bccdca4a UW |
477 | struct objfile *objfile = msymbol_objfile (msymbol); |
478 | struct gdbarch *gdbarch = get_objfile_arch (objfile); | |
479 | ||
480 | CORE_ADDR addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
714835d5 | 481 | struct obj_section *section = SYMBOL_OBJ_SECTION (msymbol); |
712f90be | 482 | enum minimal_symbol_type type = MSYMBOL_TYPE (msymbol); |
bccdca4a UW |
483 | CORE_ADDR pc; |
484 | ||
485 | /* The minimal symbol might point to a function descriptor; | |
486 | resolve it to the actual code address instead. */ | |
487 | pc = gdbarch_convert_from_func_ptr_addr (gdbarch, addr, ¤t_target); | |
488 | if (pc != addr) | |
489 | { | |
490 | /* In this case, assume we have a code symbol instead of | |
491 | a data symbol. */ | |
492 | type = mst_text; | |
714835d5 | 493 | section = NULL; |
bccdca4a UW |
494 | addr = pc; |
495 | } | |
496 | ||
497 | if (overlay_debugging) | |
714835d5 | 498 | addr = symbol_overlayed_address (addr, section); |
c906108c SS |
499 | |
500 | write_exp_elt_opcode (OP_LONG); | |
a858089e | 501 | /* Let's make the type big enough to hold a 64-bit address. */ |
46bf5051 | 502 | write_exp_elt_type (objfile_type (objfile)->builtin_core_addr); |
c906108c | 503 | write_exp_elt_longcst ((LONGEST) addr); |
c906108c SS |
504 | write_exp_elt_opcode (OP_LONG); |
505 | ||
714835d5 | 506 | if (section && section->the_bfd_section->flags & SEC_THREAD_LOCAL) |
9e35dae4 | 507 | { |
9e35dae4 | 508 | write_exp_elt_opcode (UNOP_MEMVAL_TLS); |
bccdca4a | 509 | write_exp_elt_objfile (objfile); |
46bf5051 | 510 | write_exp_elt_type (objfile_type (objfile)->nodebug_tls_symbol); |
9e35dae4 DJ |
511 | write_exp_elt_opcode (UNOP_MEMVAL_TLS); |
512 | return; | |
513 | } | |
514 | ||
c906108c | 515 | write_exp_elt_opcode (UNOP_MEMVAL); |
bccdca4a | 516 | switch (type) |
c906108c SS |
517 | { |
518 | case mst_text: | |
519 | case mst_file_text: | |
520 | case mst_solib_trampoline: | |
46bf5051 | 521 | write_exp_elt_type (objfile_type (objfile)->nodebug_text_symbol); |
c906108c SS |
522 | break; |
523 | ||
524 | case mst_data: | |
525 | case mst_file_data: | |
526 | case mst_bss: | |
527 | case mst_file_bss: | |
46bf5051 | 528 | write_exp_elt_type (objfile_type (objfile)->nodebug_data_symbol); |
c906108c SS |
529 | break; |
530 | ||
531 | default: | |
46bf5051 | 532 | write_exp_elt_type (objfile_type (objfile)->nodebug_unknown_symbol); |
c906108c SS |
533 | break; |
534 | } | |
535 | write_exp_elt_opcode (UNOP_MEMVAL); | |
536 | } | |
65d12d83 TT |
537 | |
538 | /* Mark the current index as the starting location of a structure | |
539 | expression. This is used when completing on field names. */ | |
540 | ||
541 | void | |
542 | mark_struct_expression (void) | |
543 | { | |
544 | expout_last_struct = expout_ptr; | |
545 | } | |
546 | ||
c906108c SS |
547 | \f |
548 | /* Recognize tokens that start with '$'. These include: | |
549 | ||
c5aa993b JM |
550 | $regname A native register name or a "standard |
551 | register name". | |
c906108c | 552 | |
c5aa993b JM |
553 | $variable A convenience variable with a name chosen |
554 | by the user. | |
c906108c | 555 | |
c5aa993b JM |
556 | $digits Value history with index <digits>, starting |
557 | from the first value which has index 1. | |
c906108c | 558 | |
c5aa993b JM |
559 | $$digits Value history with index <digits> relative |
560 | to the last value. I.E. $$0 is the last | |
561 | value, $$1 is the one previous to that, $$2 | |
562 | is the one previous to $$1, etc. | |
c906108c | 563 | |
c5aa993b | 564 | $ | $0 | $$0 The last value in the value history. |
c906108c | 565 | |
c5aa993b JM |
566 | $$ An abbreviation for the second to the last |
567 | value in the value history, I.E. $$1 | |
c906108c | 568 | |
c5aa993b | 569 | */ |
c906108c SS |
570 | |
571 | void | |
fba45db2 | 572 | write_dollar_variable (struct stoken str) |
c906108c | 573 | { |
d7318818 RC |
574 | struct symbol *sym = NULL; |
575 | struct minimal_symbol *msym = NULL; | |
c4a3d09a | 576 | struct internalvar *isym = NULL; |
d7318818 | 577 | |
c906108c SS |
578 | /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1) |
579 | and $$digits (equivalent to $<-digits> if you could type that). */ | |
580 | ||
c906108c SS |
581 | int negate = 0; |
582 | int i = 1; | |
583 | /* Double dollar means negate the number and add -1 as well. | |
584 | Thus $$ alone means -1. */ | |
585 | if (str.length >= 2 && str.ptr[1] == '$') | |
586 | { | |
587 | negate = 1; | |
588 | i = 2; | |
589 | } | |
590 | if (i == str.length) | |
591 | { | |
592 | /* Just dollars (one or two) */ | |
c5aa993b | 593 | i = -negate; |
c906108c SS |
594 | goto handle_last; |
595 | } | |
596 | /* Is the rest of the token digits? */ | |
597 | for (; i < str.length; i++) | |
598 | if (!(str.ptr[i] >= '0' && str.ptr[i] <= '9')) | |
599 | break; | |
600 | if (i == str.length) | |
601 | { | |
602 | i = atoi (str.ptr + 1 + negate); | |
603 | if (negate) | |
c5aa993b | 604 | i = -i; |
c906108c SS |
605 | goto handle_last; |
606 | } | |
c5aa993b | 607 | |
c906108c SS |
608 | /* Handle tokens that refer to machine registers: |
609 | $ followed by a register name. */ | |
d80b854b | 610 | i = user_reg_map_name_to_regnum (parse_gdbarch, |
029a67e4 | 611 | str.ptr + 1, str.length - 1); |
c5aa993b | 612 | if (i >= 0) |
c906108c SS |
613 | goto handle_register; |
614 | ||
c4a3d09a MF |
615 | /* Any names starting with $ are probably debugger internal variables. */ |
616 | ||
617 | isym = lookup_only_internalvar (copy_name (str) + 1); | |
618 | if (isym) | |
619 | { | |
620 | write_exp_elt_opcode (OP_INTERNALVAR); | |
621 | write_exp_elt_intern (isym); | |
622 | write_exp_elt_opcode (OP_INTERNALVAR); | |
623 | return; | |
624 | } | |
625 | ||
d7318818 RC |
626 | /* On some systems, such as HP-UX and hppa-linux, certain system routines |
627 | have names beginning with $ or $$. Check for those, first. */ | |
628 | ||
629 | sym = lookup_symbol (copy_name (str), (struct block *) NULL, | |
2570f2b7 | 630 | VAR_DOMAIN, (int *) NULL); |
d7318818 RC |
631 | if (sym) |
632 | { | |
633 | write_exp_elt_opcode (OP_VAR_VALUE); | |
634 | write_exp_elt_block (block_found); /* set by lookup_symbol */ | |
635 | write_exp_elt_sym (sym); | |
636 | write_exp_elt_opcode (OP_VAR_VALUE); | |
637 | return; | |
638 | } | |
639 | msym = lookup_minimal_symbol (copy_name (str), NULL, NULL); | |
640 | if (msym) | |
c906108c | 641 | { |
c841afd5 | 642 | write_exp_msymbol (msym); |
d7318818 | 643 | return; |
c906108c | 644 | } |
c5aa993b | 645 | |
c4a3d09a | 646 | /* Any other names are assumed to be debugger internal variables. */ |
c906108c SS |
647 | |
648 | write_exp_elt_opcode (OP_INTERNALVAR); | |
c4a3d09a | 649 | write_exp_elt_intern (create_internalvar (copy_name (str) + 1)); |
c5aa993b | 650 | write_exp_elt_opcode (OP_INTERNALVAR); |
c906108c | 651 | return; |
c5aa993b | 652 | handle_last: |
c906108c SS |
653 | write_exp_elt_opcode (OP_LAST); |
654 | write_exp_elt_longcst ((LONGEST) i); | |
655 | write_exp_elt_opcode (OP_LAST); | |
656 | return; | |
c5aa993b | 657 | handle_register: |
c906108c | 658 | write_exp_elt_opcode (OP_REGISTER); |
67f3407f DJ |
659 | str.length--; |
660 | str.ptr++; | |
661 | write_exp_string (str); | |
c5aa993b | 662 | write_exp_elt_opcode (OP_REGISTER); |
c906108c SS |
663 | return; |
664 | } | |
665 | ||
666 | ||
c906108c | 667 | char * |
fba45db2 | 668 | find_template_name_end (char *p) |
c906108c SS |
669 | { |
670 | int depth = 1; | |
671 | int just_seen_right = 0; | |
672 | int just_seen_colon = 0; | |
673 | int just_seen_space = 0; | |
c5aa993b | 674 | |
c906108c SS |
675 | if (!p || (*p != '<')) |
676 | return 0; | |
677 | ||
678 | while (*++p) | |
679 | { | |
680 | switch (*p) | |
c5aa993b JM |
681 | { |
682 | case '\'': | |
683 | case '\"': | |
684 | case '{': | |
685 | case '}': | |
686 | /* In future, may want to allow these?? */ | |
687 | return 0; | |
688 | case '<': | |
689 | depth++; /* start nested template */ | |
690 | if (just_seen_colon || just_seen_right || just_seen_space) | |
691 | return 0; /* but not after : or :: or > or space */ | |
692 | break; | |
693 | case '>': | |
694 | if (just_seen_colon || just_seen_right) | |
695 | return 0; /* end a (nested?) template */ | |
696 | just_seen_right = 1; /* but not after : or :: */ | |
697 | if (--depth == 0) /* also disallow >>, insist on > > */ | |
698 | return ++p; /* if outermost ended, return */ | |
699 | break; | |
700 | case ':': | |
701 | if (just_seen_space || (just_seen_colon > 1)) | |
702 | return 0; /* nested class spec coming up */ | |
703 | just_seen_colon++; /* we allow :: but not :::: */ | |
704 | break; | |
705 | case ' ': | |
706 | break; | |
707 | default: | |
708 | if (!((*p >= 'a' && *p <= 'z') || /* allow token chars */ | |
709 | (*p >= 'A' && *p <= 'Z') || | |
710 | (*p >= '0' && *p <= '9') || | |
711 | (*p == '_') || (*p == ',') || /* commas for template args */ | |
712 | (*p == '&') || (*p == '*') || /* pointer and ref types */ | |
713 | (*p == '(') || (*p == ')') || /* function types */ | |
714 | (*p == '[') || (*p == ']'))) /* array types */ | |
715 | return 0; | |
716 | } | |
c906108c | 717 | if (*p != ' ') |
c5aa993b | 718 | just_seen_space = 0; |
c906108c | 719 | if (*p != ':') |
c5aa993b | 720 | just_seen_colon = 0; |
c906108c | 721 | if (*p != '>') |
c5aa993b | 722 | just_seen_right = 0; |
c906108c SS |
723 | } |
724 | return 0; | |
725 | } | |
c5aa993b | 726 | \f |
c906108c SS |
727 | |
728 | ||
c906108c SS |
729 | /* Return a null-terminated temporary copy of the name |
730 | of a string token. */ | |
731 | ||
732 | char * | |
fba45db2 | 733 | copy_name (struct stoken token) |
c906108c | 734 | { |
3a913e29 JB |
735 | /* Make sure there's enough space for the token. */ |
736 | if (namecopy_size < token.length + 1) | |
737 | { | |
738 | namecopy_size = token.length + 1; | |
739 | namecopy = xrealloc (namecopy, token.length + 1); | |
740 | } | |
741 | ||
c906108c SS |
742 | memcpy (namecopy, token.ptr, token.length); |
743 | namecopy[token.length] = 0; | |
3a913e29 | 744 | |
c906108c SS |
745 | return namecopy; |
746 | } | |
747 | \f | |
748 | /* Reverse an expression from suffix form (in which it is constructed) | |
65d12d83 TT |
749 | to prefix form (in which we can conveniently print or execute it). |
750 | Ordinarily this always returns -1. However, if EXPOUT_LAST_STRUCT | |
751 | is not -1 (i.e., we are trying to complete a field name), it will | |
752 | return the index of the subexpression which is the left-hand-side | |
753 | of the struct operation at EXPOUT_LAST_STRUCT. */ | |
c906108c | 754 | |
65d12d83 | 755 | static int |
f86f5ca3 | 756 | prefixify_expression (struct expression *expr) |
c906108c | 757 | { |
df2a60d0 | 758 | int len = sizeof (struct expression) + EXP_ELEM_TO_BYTES (expr->nelts); |
f86f5ca3 PH |
759 | struct expression *temp; |
760 | int inpos = expr->nelts, outpos = 0; | |
c906108c SS |
761 | |
762 | temp = (struct expression *) alloca (len); | |
763 | ||
764 | /* Copy the original expression into temp. */ | |
765 | memcpy (temp, expr, len); | |
766 | ||
65d12d83 | 767 | return prefixify_subexp (temp, expr, inpos, outpos); |
c906108c SS |
768 | } |
769 | ||
24daaebc PH |
770 | /* Return the number of exp_elements in the postfix subexpression |
771 | of EXPR whose operator is at index ENDPOS - 1 in EXPR. */ | |
c906108c SS |
772 | |
773 | int | |
f86f5ca3 | 774 | length_of_subexp (struct expression *expr, int endpos) |
24daaebc | 775 | { |
6b4398f7 | 776 | int oplen, args; |
24daaebc PH |
777 | |
778 | operator_length (expr, endpos, &oplen, &args); | |
779 | ||
780 | while (args > 0) | |
781 | { | |
782 | oplen += length_of_subexp (expr, endpos - oplen); | |
783 | args--; | |
784 | } | |
785 | ||
786 | return oplen; | |
787 | } | |
788 | ||
789 | /* Sets *OPLENP to the length of the operator whose (last) index is | |
790 | ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that | |
791 | operator takes. */ | |
792 | ||
793 | void | |
554794dc SDJ |
794 | operator_length (const struct expression *expr, int endpos, int *oplenp, |
795 | int *argsp) | |
5f9769d1 PH |
796 | { |
797 | expr->language_defn->la_exp_desc->operator_length (expr, endpos, | |
798 | oplenp, argsp); | |
799 | } | |
800 | ||
801 | /* Default value for operator_length in exp_descriptor vectors. */ | |
802 | ||
803 | void | |
554794dc | 804 | operator_length_standard (const struct expression *expr, int endpos, |
5f9769d1 | 805 | int *oplenp, int *argsp) |
c906108c | 806 | { |
f86f5ca3 PH |
807 | int oplen = 1; |
808 | int args = 0; | |
0b4e1325 | 809 | enum f90_range_type range_type; |
f86f5ca3 | 810 | int i; |
c906108c SS |
811 | |
812 | if (endpos < 1) | |
8a3fe4f8 | 813 | error (_("?error in operator_length_standard")); |
c906108c SS |
814 | |
815 | i = (int) expr->elts[endpos - 1].opcode; | |
816 | ||
817 | switch (i) | |
818 | { | |
819 | /* C++ */ | |
820 | case OP_SCOPE: | |
821 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); | |
822 | oplen = 5 + BYTES_TO_EXP_ELEM (oplen + 1); | |
823 | break; | |
824 | ||
825 | case OP_LONG: | |
826 | case OP_DOUBLE: | |
27bc4d80 | 827 | case OP_DECFLOAT: |
c906108c SS |
828 | case OP_VAR_VALUE: |
829 | oplen = 4; | |
830 | break; | |
831 | ||
832 | case OP_TYPE: | |
833 | case OP_BOOL: | |
834 | case OP_LAST: | |
c906108c SS |
835 | case OP_INTERNALVAR: |
836 | oplen = 3; | |
837 | break; | |
838 | ||
839 | case OP_COMPLEX: | |
c806c55a | 840 | oplen = 3; |
c906108c | 841 | args = 2; |
c5aa993b | 842 | break; |
c906108c SS |
843 | |
844 | case OP_FUNCALL: | |
845 | case OP_F77_UNDETERMINED_ARGLIST: | |
846 | oplen = 3; | |
847 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); | |
848 | break; | |
849 | ||
072bba3b KS |
850 | case TYPE_INSTANCE: |
851 | oplen = 4 + longest_to_int (expr->elts[endpos - 2].longconst); | |
852 | args = 1; | |
853 | break; | |
854 | ||
646df18d | 855 | case OP_OBJC_MSGCALL: /* Objective C message (method) call */ |
53c551b7 AF |
856 | oplen = 4; |
857 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); | |
858 | break; | |
859 | ||
c906108c SS |
860 | case UNOP_MAX: |
861 | case UNOP_MIN: | |
862 | oplen = 3; | |
863 | break; | |
864 | ||
c5aa993b JM |
865 | case BINOP_VAL: |
866 | case UNOP_CAST: | |
4e8f195d TT |
867 | case UNOP_DYNAMIC_CAST: |
868 | case UNOP_REINTERPRET_CAST: | |
c5aa993b | 869 | case UNOP_MEMVAL: |
c906108c SS |
870 | oplen = 3; |
871 | args = 1; | |
872 | break; | |
873 | ||
9e35dae4 DJ |
874 | case UNOP_MEMVAL_TLS: |
875 | oplen = 4; | |
876 | args = 1; | |
877 | break; | |
878 | ||
c906108c SS |
879 | case UNOP_ABS: |
880 | case UNOP_CAP: | |
881 | case UNOP_CHR: | |
882 | case UNOP_FLOAT: | |
883 | case UNOP_HIGH: | |
884 | case UNOP_ODD: | |
885 | case UNOP_ORD: | |
886 | case UNOP_TRUNC: | |
887 | oplen = 1; | |
888 | args = 1; | |
889 | break; | |
890 | ||
7322dca9 SW |
891 | case OP_ADL_FUNC: |
892 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); | |
893 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1); | |
894 | oplen++; | |
895 | oplen++; | |
896 | break; | |
897 | ||
c906108c SS |
898 | case OP_LABELED: |
899 | case STRUCTOP_STRUCT: | |
900 | case STRUCTOP_PTR: | |
901 | args = 1; | |
902 | /* fall through */ | |
67f3407f | 903 | case OP_REGISTER: |
c906108c SS |
904 | case OP_M2_STRING: |
905 | case OP_STRING: | |
646df18d AF |
906 | case OP_OBJC_NSSTRING: /* Objective C Foundation Class NSString constant */ |
907 | case OP_OBJC_SELECTOR: /* Objective C "@selector" pseudo-op */ | |
c906108c | 908 | case OP_NAME: |
c906108c SS |
909 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); |
910 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1); | |
911 | break; | |
912 | ||
913 | case OP_BITSTRING: | |
914 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); | |
915 | oplen = (oplen + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; | |
916 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen); | |
917 | break; | |
918 | ||
919 | case OP_ARRAY: | |
920 | oplen = 4; | |
921 | args = longest_to_int (expr->elts[endpos - 2].longconst); | |
922 | args -= longest_to_int (expr->elts[endpos - 3].longconst); | |
923 | args += 1; | |
924 | break; | |
925 | ||
926 | case TERNOP_COND: | |
927 | case TERNOP_SLICE: | |
928 | case TERNOP_SLICE_COUNT: | |
929 | args = 3; | |
930 | break; | |
931 | ||
932 | /* Modula-2 */ | |
c5aa993b | 933 | case MULTI_SUBSCRIPT: |
c906108c | 934 | oplen = 3; |
c5aa993b | 935 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); |
c906108c SS |
936 | break; |
937 | ||
938 | case BINOP_ASSIGN_MODIFY: | |
939 | oplen = 3; | |
940 | args = 2; | |
941 | break; | |
942 | ||
943 | /* C++ */ | |
944 | case OP_THIS: | |
646df18d | 945 | case OP_OBJC_SELF: |
c906108c SS |
946 | oplen = 2; |
947 | break; | |
948 | ||
0b4e1325 WZ |
949 | case OP_F90_RANGE: |
950 | oplen = 3; | |
951 | ||
952 | range_type = longest_to_int (expr->elts[endpos - 2].longconst); | |
953 | switch (range_type) | |
954 | { | |
955 | case LOW_BOUND_DEFAULT: | |
956 | case HIGH_BOUND_DEFAULT: | |
957 | args = 1; | |
958 | break; | |
959 | case BOTH_BOUND_DEFAULT: | |
960 | args = 0; | |
961 | break; | |
962 | case NONE_BOUND_DEFAULT: | |
963 | args = 2; | |
964 | break; | |
965 | } | |
966 | ||
967 | break; | |
968 | ||
c906108c SS |
969 | default: |
970 | args = 1 + (i < (int) BINOP_END); | |
971 | } | |
972 | ||
24daaebc PH |
973 | *oplenp = oplen; |
974 | *argsp = args; | |
c906108c SS |
975 | } |
976 | ||
977 | /* Copy the subexpression ending just before index INEND in INEXPR | |
978 | into OUTEXPR, starting at index OUTBEG. | |
65d12d83 TT |
979 | In the process, convert it from suffix to prefix form. |
980 | If EXPOUT_LAST_STRUCT is -1, then this function always returns -1. | |
981 | Otherwise, it returns the index of the subexpression which is the | |
982 | left-hand-side of the expression at EXPOUT_LAST_STRUCT. */ | |
c906108c | 983 | |
65d12d83 | 984 | static int |
f86f5ca3 PH |
985 | prefixify_subexp (struct expression *inexpr, |
986 | struct expression *outexpr, int inend, int outbeg) | |
c906108c | 987 | { |
24daaebc PH |
988 | int oplen; |
989 | int args; | |
f86f5ca3 | 990 | int i; |
c906108c | 991 | int *arglens; |
65d12d83 | 992 | int result = -1; |
c906108c | 993 | |
24daaebc | 994 | operator_length (inexpr, inend, &oplen, &args); |
c906108c SS |
995 | |
996 | /* Copy the final operator itself, from the end of the input | |
997 | to the beginning of the output. */ | |
998 | inend -= oplen; | |
999 | memcpy (&outexpr->elts[outbeg], &inexpr->elts[inend], | |
1000 | EXP_ELEM_TO_BYTES (oplen)); | |
1001 | outbeg += oplen; | |
1002 | ||
65d12d83 TT |
1003 | if (expout_last_struct == inend) |
1004 | result = outbeg - oplen; | |
1005 | ||
c906108c SS |
1006 | /* Find the lengths of the arg subexpressions. */ |
1007 | arglens = (int *) alloca (args * sizeof (int)); | |
1008 | for (i = args - 1; i >= 0; i--) | |
1009 | { | |
1010 | oplen = length_of_subexp (inexpr, inend); | |
1011 | arglens[i] = oplen; | |
1012 | inend -= oplen; | |
1013 | } | |
1014 | ||
1015 | /* Now copy each subexpression, preserving the order of | |
1016 | the subexpressions, but prefixifying each one. | |
1017 | In this loop, inend starts at the beginning of | |
1018 | the expression this level is working on | |
1019 | and marches forward over the arguments. | |
1020 | outbeg does similarly in the output. */ | |
1021 | for (i = 0; i < args; i++) | |
1022 | { | |
65d12d83 | 1023 | int r; |
ad3bbd48 | 1024 | |
c906108c SS |
1025 | oplen = arglens[i]; |
1026 | inend += oplen; | |
65d12d83 TT |
1027 | r = prefixify_subexp (inexpr, outexpr, inend, outbeg); |
1028 | if (r != -1) | |
1029 | { | |
1030 | /* Return immediately. We probably have only parsed a | |
1031 | partial expression, so we don't want to try to reverse | |
1032 | the other operands. */ | |
1033 | return r; | |
1034 | } | |
c906108c SS |
1035 | outbeg += oplen; |
1036 | } | |
65d12d83 TT |
1037 | |
1038 | return result; | |
c906108c SS |
1039 | } |
1040 | \f | |
c906108c SS |
1041 | /* Read an expression from the string *STRINGPTR points to, |
1042 | parse it, and return a pointer to a struct expression that we malloc. | |
1043 | Use block BLOCK as the lexical context for variable names; | |
1044 | if BLOCK is zero, use the block of the selected stack frame. | |
1045 | Meanwhile, advance *STRINGPTR to point after the expression, | |
1046 | at the first nonwhite character that is not part of the expression | |
1047 | (possibly a null character). | |
1048 | ||
1049 | If COMMA is nonzero, stop if a comma is reached. */ | |
1050 | ||
1051 | struct expression * | |
fba45db2 | 1052 | parse_exp_1 (char **stringptr, struct block *block, int comma) |
e85c3284 | 1053 | { |
65d12d83 | 1054 | return parse_exp_in_context (stringptr, block, comma, 0, NULL); |
e85c3284 PH |
1055 | } |
1056 | ||
1057 | /* As for parse_exp_1, except that if VOID_CONTEXT_P, then | |
65d12d83 TT |
1058 | no value is expected from the expression. |
1059 | OUT_SUBEXP is set when attempting to complete a field name; in this | |
1060 | case it is set to the index of the subexpression on the | |
1061 | left-hand-side of the struct op. If not doing such completion, it | |
1062 | is left untouched. */ | |
e85c3284 PH |
1063 | |
1064 | static struct expression * | |
1065 | parse_exp_in_context (char **stringptr, struct block *block, int comma, | |
65d12d83 | 1066 | int void_context_p, int *out_subexp) |
c906108c | 1067 | { |
65d12d83 | 1068 | volatile struct gdb_exception except; |
c906108c | 1069 | struct cleanup *old_chain; |
0cce5bd9 | 1070 | const struct language_defn *lang = NULL; |
65d12d83 | 1071 | int subexp; |
c906108c SS |
1072 | |
1073 | lexptr = *stringptr; | |
665132f9 | 1074 | prev_lexptr = NULL; |
c906108c SS |
1075 | |
1076 | paren_depth = 0; | |
1077 | type_stack_depth = 0; | |
65d12d83 | 1078 | expout_last_struct = -1; |
c906108c SS |
1079 | |
1080 | comma_terminates = comma; | |
1081 | ||
1082 | if (lexptr == 0 || *lexptr == 0) | |
e2e0b3e5 | 1083 | error_no_arg (_("expression to compute")); |
c906108c | 1084 | |
74b7792f | 1085 | old_chain = make_cleanup (free_funcalls, 0 /*ignore*/); |
c906108c SS |
1086 | funcall_chain = 0; |
1087 | ||
d705c43c | 1088 | expression_context_block = block; |
59f92a09 | 1089 | |
d705c43c PA |
1090 | /* If no context specified, try using the current frame, if any. */ |
1091 | if (!expression_context_block) | |
1092 | expression_context_block = get_selected_block (&expression_context_pc); | |
1093 | else | |
1094 | expression_context_pc = BLOCK_START (expression_context_block); | |
59f92a09 | 1095 | |
d705c43c | 1096 | /* Fall back to using the current source static context, if any. */ |
59f92a09 | 1097 | |
d705c43c | 1098 | if (!expression_context_block) |
59f92a09 FF |
1099 | { |
1100 | struct symtab_and_line cursal = get_current_source_symtab_and_line (); | |
1101 | if (cursal.symtab) | |
d705c43c PA |
1102 | expression_context_block |
1103 | = BLOCKVECTOR_BLOCK (BLOCKVECTOR (cursal.symtab), STATIC_BLOCK); | |
1104 | if (expression_context_block) | |
1105 | expression_context_pc = BLOCK_START (expression_context_block); | |
84f0252a | 1106 | } |
c906108c | 1107 | |
0cce5bd9 JB |
1108 | if (language_mode == language_mode_auto && block != NULL) |
1109 | { | |
1110 | /* Find the language associated to the given context block. | |
1111 | Default to the current language if it can not be determined. | |
1112 | ||
1113 | Note that using the language corresponding to the current frame | |
1114 | can sometimes give unexpected results. For instance, this | |
1115 | routine is often called several times during the inferior | |
1116 | startup phase to re-parse breakpoint expressions after | |
1117 | a new shared library has been loaded. The language associated | |
1118 | to the current frame at this moment is not relevant for | |
1119 | the breakpoint. Using it would therefore be silly, so it seems | |
1120 | better to rely on the current language rather than relying on | |
1121 | the current frame language to parse the expression. That's why | |
1122 | we do the following language detection only if the context block | |
1123 | has been specifically provided. */ | |
1124 | struct symbol *func = block_linkage_function (block); | |
1125 | ||
1126 | if (func != NULL) | |
1127 | lang = language_def (SYMBOL_LANGUAGE (func)); | |
1128 | if (lang == NULL || lang->la_language == language_unknown) | |
1129 | lang = current_language; | |
1130 | } | |
1131 | else | |
1132 | lang = current_language; | |
1133 | ||
c906108c SS |
1134 | expout_size = 10; |
1135 | expout_ptr = 0; | |
1136 | expout = (struct expression *) | |
1137 | xmalloc (sizeof (struct expression) + EXP_ELEM_TO_BYTES (expout_size)); | |
0cce5bd9 | 1138 | expout->language_defn = lang; |
e17c207e | 1139 | expout->gdbarch = get_current_arch (); |
c906108c | 1140 | |
65d12d83 TT |
1141 | TRY_CATCH (except, RETURN_MASK_ALL) |
1142 | { | |
0cce5bd9 JB |
1143 | if (lang->la_parser ()) |
1144 | lang->la_error (NULL); | |
65d12d83 TT |
1145 | } |
1146 | if (except.reason < 0) | |
1147 | { | |
1148 | if (! in_parse_field) | |
1149 | { | |
1150 | xfree (expout); | |
1151 | throw_exception (except); | |
1152 | } | |
1153 | } | |
c906108c SS |
1154 | |
1155 | discard_cleanups (old_chain); | |
1156 | ||
1157 | /* Record the actual number of expression elements, and then | |
1158 | reallocate the expression memory so that we free up any | |
1159 | excess elements. */ | |
1160 | ||
1161 | expout->nelts = expout_ptr; | |
1162 | expout = (struct expression *) | |
1163 | xrealloc ((char *) expout, | |
1164 | sizeof (struct expression) + EXP_ELEM_TO_BYTES (expout_ptr));; | |
1165 | ||
1166 | /* Convert expression from postfix form as generated by yacc | |
1167 | parser, to a prefix form. */ | |
1168 | ||
c906108c | 1169 | if (expressiondebug) |
24daaebc PH |
1170 | dump_raw_expression (expout, gdb_stdlog, |
1171 | "before conversion to prefix form"); | |
c906108c | 1172 | |
65d12d83 TT |
1173 | subexp = prefixify_expression (expout); |
1174 | if (out_subexp) | |
1175 | *out_subexp = subexp; | |
c906108c | 1176 | |
0cce5bd9 | 1177 | lang->la_post_parser (&expout, void_context_p); |
e85c3284 | 1178 | |
c906108c | 1179 | if (expressiondebug) |
24daaebc | 1180 | dump_prefix_expression (expout, gdb_stdlog); |
c906108c SS |
1181 | |
1182 | *stringptr = lexptr; | |
1183 | return expout; | |
1184 | } | |
1185 | ||
1186 | /* Parse STRING as an expression, and complain if this fails | |
1187 | to use up all of the contents of STRING. */ | |
1188 | ||
1189 | struct expression * | |
fba45db2 | 1190 | parse_expression (char *string) |
c906108c | 1191 | { |
f86f5ca3 | 1192 | struct expression *exp; |
ad3bbd48 | 1193 | |
c906108c SS |
1194 | exp = parse_exp_1 (&string, 0, 0); |
1195 | if (*string) | |
8a3fe4f8 | 1196 | error (_("Junk after end of expression.")); |
c906108c SS |
1197 | return exp; |
1198 | } | |
e85c3284 | 1199 | |
65d12d83 TT |
1200 | /* Parse STRING as an expression. If parsing ends in the middle of a |
1201 | field reference, return the type of the left-hand-side of the | |
1202 | reference; furthermore, if the parsing ends in the field name, | |
c92817ce TT |
1203 | return the field name in *NAME. If the parsing ends in the middle |
1204 | of a field reference, but the reference is somehow invalid, throw | |
1205 | an exception. In all other cases, return NULL. Returned non-NULL | |
1206 | *NAME must be freed by the caller. */ | |
65d12d83 TT |
1207 | |
1208 | struct type * | |
1209 | parse_field_expression (char *string, char **name) | |
1210 | { | |
1211 | struct expression *exp = NULL; | |
1212 | struct value *val; | |
1213 | int subexp; | |
1214 | volatile struct gdb_exception except; | |
1215 | ||
c92817ce | 1216 | TRY_CATCH (except, RETURN_MASK_ERROR) |
65d12d83 TT |
1217 | { |
1218 | in_parse_field = 1; | |
1219 | exp = parse_exp_in_context (&string, 0, 0, 0, &subexp); | |
1220 | } | |
1221 | in_parse_field = 0; | |
1222 | if (except.reason < 0 || ! exp) | |
1223 | return NULL; | |
1224 | if (expout_last_struct == -1) | |
1225 | { | |
1226 | xfree (exp); | |
1227 | return NULL; | |
1228 | } | |
1229 | ||
1230 | *name = extract_field_op (exp, &subexp); | |
1231 | if (!*name) | |
1232 | { | |
1233 | xfree (exp); | |
1234 | return NULL; | |
1235 | } | |
a0b7aece | 1236 | |
c92817ce TT |
1237 | /* This might throw an exception. If so, we want to let it |
1238 | propagate. */ | |
65d12d83 | 1239 | val = evaluate_subexpression_type (exp, subexp); |
c92817ce TT |
1240 | /* (*NAME) is a part of the EXP memory block freed below. */ |
1241 | *name = xstrdup (*name); | |
65d12d83 TT |
1242 | xfree (exp); |
1243 | ||
1244 | return value_type (val); | |
1245 | } | |
1246 | ||
e85c3284 PH |
1247 | /* A post-parser that does nothing */ |
1248 | ||
e85c3284 PH |
1249 | void |
1250 | null_post_parser (struct expression **exp, int void_context_p) | |
1251 | { | |
1252 | } | |
d30f5e1f DE |
1253 | |
1254 | /* Parse floating point value P of length LEN. | |
1255 | Return 0 (false) if invalid, 1 (true) if valid. | |
1256 | The successfully parsed number is stored in D. | |
1257 | *SUFFIX points to the suffix of the number in P. | |
1258 | ||
1259 | NOTE: This accepts the floating point syntax that sscanf accepts. */ | |
1260 | ||
1261 | int | |
1262 | parse_float (const char *p, int len, DOUBLEST *d, const char **suffix) | |
1263 | { | |
1264 | char *copy; | |
1265 | char *s; | |
1266 | int n, num; | |
1267 | ||
1268 | copy = xmalloc (len + 1); | |
1269 | memcpy (copy, p, len); | |
1270 | copy[len] = 0; | |
1271 | ||
1272 | num = sscanf (copy, "%" DOUBLEST_SCAN_FORMAT "%n", d, &n); | |
1273 | xfree (copy); | |
1274 | ||
1275 | /* The sscanf man page suggests not making any assumptions on the effect | |
1276 | of %n on the result, so we don't. | |
1277 | That is why we simply test num == 0. */ | |
1278 | if (num == 0) | |
1279 | return 0; | |
1280 | ||
1281 | *suffix = p + n; | |
1282 | return 1; | |
1283 | } | |
1284 | ||
1285 | /* Parse floating point value P of length LEN, using the C syntax for floats. | |
1286 | Return 0 (false) if invalid, 1 (true) if valid. | |
1287 | The successfully parsed number is stored in *D. | |
1288 | Its type is taken from builtin_type (gdbarch) and is stored in *T. */ | |
1289 | ||
1290 | int | |
1291 | parse_c_float (struct gdbarch *gdbarch, const char *p, int len, | |
1292 | DOUBLEST *d, struct type **t) | |
1293 | { | |
1294 | const char *suffix; | |
1295 | int suffix_len; | |
1296 | const struct builtin_type *builtin_types = builtin_type (gdbarch); | |
1297 | ||
1298 | if (! parse_float (p, len, d, &suffix)) | |
1299 | return 0; | |
1300 | ||
1301 | suffix_len = p + len - suffix; | |
1302 | ||
1303 | if (suffix_len == 0) | |
1304 | *t = builtin_types->builtin_double; | |
1305 | else if (suffix_len == 1) | |
1306 | { | |
1307 | /* Handle suffixes: 'f' for float, 'l' for long double. */ | |
1308 | if (tolower (*suffix) == 'f') | |
1309 | *t = builtin_types->builtin_float; | |
1310 | else if (tolower (*suffix) == 'l') | |
1311 | *t = builtin_types->builtin_long_double; | |
1312 | else | |
1313 | return 0; | |
1314 | } | |
1315 | else | |
1316 | return 0; | |
1317 | ||
1318 | return 1; | |
1319 | } | |
c906108c SS |
1320 | \f |
1321 | /* Stuff for maintaining a stack of types. Currently just used by C, but | |
1322 | probably useful for any language which declares its types "backwards". */ | |
1323 | ||
47663de5 MS |
1324 | static void |
1325 | check_type_stack_depth (void) | |
c906108c SS |
1326 | { |
1327 | if (type_stack_depth == type_stack_size) | |
1328 | { | |
1329 | type_stack_size *= 2; | |
1330 | type_stack = (union type_stack_elt *) | |
1331 | xrealloc ((char *) type_stack, type_stack_size * sizeof (*type_stack)); | |
1332 | } | |
47663de5 MS |
1333 | } |
1334 | ||
1335 | void | |
1336 | push_type (enum type_pieces tp) | |
1337 | { | |
1338 | check_type_stack_depth (); | |
c906108c SS |
1339 | type_stack[type_stack_depth++].piece = tp; |
1340 | } | |
1341 | ||
1342 | void | |
fba45db2 | 1343 | push_type_int (int n) |
c906108c | 1344 | { |
47663de5 | 1345 | check_type_stack_depth (); |
c906108c SS |
1346 | type_stack[type_stack_depth++].int_val = n; |
1347 | } | |
1348 | ||
47663de5 MS |
1349 | void |
1350 | push_type_address_space (char *string) | |
1351 | { | |
50810684 | 1352 | push_type_int (address_space_name_to_int (parse_gdbarch, string)); |
47663de5 MS |
1353 | } |
1354 | ||
c5aa993b | 1355 | enum type_pieces |
fba45db2 | 1356 | pop_type (void) |
c906108c SS |
1357 | { |
1358 | if (type_stack_depth) | |
1359 | return type_stack[--type_stack_depth].piece; | |
1360 | return tp_end; | |
1361 | } | |
1362 | ||
1363 | int | |
fba45db2 | 1364 | pop_type_int (void) |
c906108c SS |
1365 | { |
1366 | if (type_stack_depth) | |
1367 | return type_stack[--type_stack_depth].int_val; | |
1368 | /* "Can't happen". */ | |
1369 | return 0; | |
1370 | } | |
1371 | ||
1372 | /* Pop the type stack and return the type which corresponds to FOLLOW_TYPE | |
1373 | as modified by all the stuff on the stack. */ | |
1374 | struct type * | |
fba45db2 | 1375 | follow_types (struct type *follow_type) |
c906108c SS |
1376 | { |
1377 | int done = 0; | |
2e2394a0 MS |
1378 | int make_const = 0; |
1379 | int make_volatile = 0; | |
47663de5 | 1380 | int make_addr_space = 0; |
c906108c | 1381 | int array_size; |
c906108c SS |
1382 | |
1383 | while (!done) | |
1384 | switch (pop_type ()) | |
1385 | { | |
1386 | case tp_end: | |
1387 | done = 1; | |
2e2394a0 MS |
1388 | if (make_const) |
1389 | follow_type = make_cv_type (make_const, | |
1390 | TYPE_VOLATILE (follow_type), | |
1391 | follow_type, 0); | |
1392 | if (make_volatile) | |
1393 | follow_type = make_cv_type (TYPE_CONST (follow_type), | |
1394 | make_volatile, | |
1395 | follow_type, 0); | |
47663de5 MS |
1396 | if (make_addr_space) |
1397 | follow_type = make_type_with_address_space (follow_type, | |
1398 | make_addr_space); | |
1399 | make_const = make_volatile = 0; | |
1400 | make_addr_space = 0; | |
2e2394a0 MS |
1401 | break; |
1402 | case tp_const: | |
1403 | make_const = 1; | |
1404 | break; | |
1405 | case tp_volatile: | |
1406 | make_volatile = 1; | |
c906108c | 1407 | break; |
47663de5 MS |
1408 | case tp_space_identifier: |
1409 | make_addr_space = pop_type_int (); | |
1410 | break; | |
c906108c SS |
1411 | case tp_pointer: |
1412 | follow_type = lookup_pointer_type (follow_type); | |
2e2394a0 MS |
1413 | if (make_const) |
1414 | follow_type = make_cv_type (make_const, | |
1415 | TYPE_VOLATILE (follow_type), | |
1416 | follow_type, 0); | |
1417 | if (make_volatile) | |
1418 | follow_type = make_cv_type (TYPE_CONST (follow_type), | |
1419 | make_volatile, | |
1420 | follow_type, 0); | |
47663de5 MS |
1421 | if (make_addr_space) |
1422 | follow_type = make_type_with_address_space (follow_type, | |
1423 | make_addr_space); | |
2e2394a0 | 1424 | make_const = make_volatile = 0; |
47663de5 | 1425 | make_addr_space = 0; |
c906108c SS |
1426 | break; |
1427 | case tp_reference: | |
1428 | follow_type = lookup_reference_type (follow_type); | |
2e2394a0 | 1429 | if (make_const) |
47663de5 MS |
1430 | follow_type = make_cv_type (make_const, |
1431 | TYPE_VOLATILE (follow_type), | |
1432 | follow_type, 0); | |
2e2394a0 | 1433 | if (make_volatile) |
47663de5 MS |
1434 | follow_type = make_cv_type (TYPE_CONST (follow_type), |
1435 | make_volatile, | |
1436 | follow_type, 0); | |
1437 | if (make_addr_space) | |
1438 | follow_type = make_type_with_address_space (follow_type, | |
1439 | make_addr_space); | |
2e2394a0 | 1440 | make_const = make_volatile = 0; |
47663de5 | 1441 | make_addr_space = 0; |
c906108c SS |
1442 | break; |
1443 | case tp_array: | |
1444 | array_size = pop_type_int (); | |
1445 | /* FIXME-type-allocation: need a way to free this type when we are | |
1446 | done with it. */ | |
c906108c | 1447 | follow_type = |
e3506a9f UW |
1448 | lookup_array_range_type (follow_type, |
1449 | 0, array_size >= 0 ? array_size - 1 : 0); | |
c906108c | 1450 | if (array_size < 0) |
d78df370 | 1451 | TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (follow_type) = 1; |
c906108c SS |
1452 | break; |
1453 | case tp_function: | |
1454 | /* FIXME-type-allocation: need a way to free this type when we are | |
1455 | done with it. */ | |
1456 | follow_type = lookup_function_type (follow_type); | |
1457 | break; | |
1458 | } | |
1459 | return follow_type; | |
1460 | } | |
1461 | \f | |
f461f5cf PM |
1462 | /* This function avoids direct calls to fprintf |
1463 | in the parser generated debug code. */ | |
1464 | void | |
1465 | parser_fprintf (FILE *x, const char *y, ...) | |
1466 | { | |
1467 | va_list args; | |
ad3bbd48 | 1468 | |
f461f5cf PM |
1469 | va_start (args, y); |
1470 | if (x == stderr) | |
1471 | vfprintf_unfiltered (gdb_stderr, y, args); | |
1472 | else | |
1473 | { | |
1474 | fprintf_unfiltered (gdb_stderr, " Unknown FILE used.\n"); | |
1475 | vfprintf_unfiltered (gdb_stderr, y, args); | |
1476 | } | |
1477 | va_end (args); | |
1478 | } | |
1479 | ||
c0201579 JK |
1480 | /* Implementation of the exp_descriptor method operator_check. */ |
1481 | ||
1482 | int | |
1483 | operator_check_standard (struct expression *exp, int pos, | |
1484 | int (*objfile_func) (struct objfile *objfile, | |
1485 | void *data), | |
1486 | void *data) | |
1487 | { | |
1488 | const union exp_element *const elts = exp->elts; | |
1489 | struct type *type = NULL; | |
1490 | struct objfile *objfile = NULL; | |
1491 | ||
1492 | /* Extended operators should have been already handled by exp_descriptor | |
1493 | iterate method of its specific language. */ | |
1494 | gdb_assert (elts[pos].opcode < OP_EXTENDED0); | |
1495 | ||
1496 | /* Track the callers of write_exp_elt_type for this table. */ | |
1497 | ||
1498 | switch (elts[pos].opcode) | |
1499 | { | |
1500 | case BINOP_VAL: | |
1501 | case OP_COMPLEX: | |
1502 | case OP_DECFLOAT: | |
1503 | case OP_DOUBLE: | |
1504 | case OP_LONG: | |
1505 | case OP_SCOPE: | |
1506 | case OP_TYPE: | |
1507 | case UNOP_CAST: | |
1508 | case UNOP_DYNAMIC_CAST: | |
1509 | case UNOP_REINTERPRET_CAST: | |
1510 | case UNOP_MAX: | |
1511 | case UNOP_MEMVAL: | |
1512 | case UNOP_MIN: | |
1513 | type = elts[pos + 1].type; | |
1514 | break; | |
1515 | ||
1516 | case TYPE_INSTANCE: | |
1517 | { | |
1518 | LONGEST arg, nargs = elts[pos + 1].longconst; | |
1519 | ||
1520 | for (arg = 0; arg < nargs; arg++) | |
1521 | { | |
1522 | struct type *type = elts[pos + 2 + arg].type; | |
1523 | struct objfile *objfile = TYPE_OBJFILE (type); | |
1524 | ||
1525 | if (objfile && (*objfile_func) (objfile, data)) | |
1526 | return 1; | |
1527 | } | |
1528 | } | |
1529 | break; | |
1530 | ||
1531 | case UNOP_MEMVAL_TLS: | |
1532 | objfile = elts[pos + 1].objfile; | |
1533 | type = elts[pos + 2].type; | |
1534 | break; | |
1535 | ||
1536 | case OP_VAR_VALUE: | |
1537 | { | |
1538 | const struct block *const block = elts[pos + 1].block; | |
1539 | const struct symbol *const symbol = elts[pos + 2].symbol; | |
1540 | ||
1541 | /* Check objfile where the variable itself is placed. | |
1542 | SYMBOL_OBJ_SECTION (symbol) may be NULL. */ | |
1543 | if ((*objfile_func) (SYMBOL_SYMTAB (symbol)->objfile, data)) | |
1544 | return 1; | |
1545 | ||
1546 | /* Check objfile where is placed the code touching the variable. */ | |
1547 | objfile = lookup_objfile_from_block (block); | |
1548 | ||
1549 | type = SYMBOL_TYPE (symbol); | |
1550 | } | |
1551 | break; | |
1552 | } | |
1553 | ||
1554 | /* Invoke callbacks for TYPE and OBJFILE if they were set as non-NULL. */ | |
1555 | ||
1556 | if (type && TYPE_OBJFILE (type) | |
1557 | && (*objfile_func) (TYPE_OBJFILE (type), data)) | |
1558 | return 1; | |
1559 | if (objfile && (*objfile_func) (objfile, data)) | |
1560 | return 1; | |
1561 | ||
1562 | return 0; | |
1563 | } | |
1564 | ||
1565 | /* Call OBJFILE_FUNC for any TYPE and OBJFILE found being referenced by EXP. | |
1566 | The functions are never called with NULL OBJFILE. Functions get passed an | |
1567 | arbitrary caller supplied DATA pointer. If any of the functions returns | |
1568 | non-zero value then (any other) non-zero value is immediately returned to | |
1569 | the caller. Otherwise zero is returned after iterating through whole EXP. | |
1570 | */ | |
1571 | ||
1572 | static int | |
1573 | exp_iterate (struct expression *exp, | |
1574 | int (*objfile_func) (struct objfile *objfile, void *data), | |
1575 | void *data) | |
1576 | { | |
1577 | int endpos; | |
c0201579 JK |
1578 | |
1579 | for (endpos = exp->nelts; endpos > 0; ) | |
1580 | { | |
1581 | int pos, args, oplen = 0; | |
1582 | ||
dc21167c | 1583 | operator_length (exp, endpos, &oplen, &args); |
c0201579 JK |
1584 | gdb_assert (oplen > 0); |
1585 | ||
1586 | pos = endpos - oplen; | |
1587 | if (exp->language_defn->la_exp_desc->operator_check (exp, pos, | |
1588 | objfile_func, data)) | |
1589 | return 1; | |
1590 | ||
1591 | endpos = pos; | |
1592 | } | |
1593 | ||
1594 | return 0; | |
1595 | } | |
1596 | ||
1597 | /* Helper for exp_uses_objfile. */ | |
1598 | ||
1599 | static int | |
1600 | exp_uses_objfile_iter (struct objfile *exp_objfile, void *objfile_voidp) | |
1601 | { | |
1602 | struct objfile *objfile = objfile_voidp; | |
1603 | ||
1604 | if (exp_objfile->separate_debug_objfile_backlink) | |
1605 | exp_objfile = exp_objfile->separate_debug_objfile_backlink; | |
1606 | ||
1607 | return exp_objfile == objfile; | |
1608 | } | |
1609 | ||
1610 | /* Return 1 if EXP uses OBJFILE (and will become dangling when OBJFILE | |
1611 | is unloaded), otherwise return 0. OBJFILE must not be a separate debug info | |
1612 | file. */ | |
1613 | ||
1614 | int | |
1615 | exp_uses_objfile (struct expression *exp, struct objfile *objfile) | |
1616 | { | |
1617 | gdb_assert (objfile->separate_debug_objfile_backlink == NULL); | |
1618 | ||
1619 | return exp_iterate (exp, exp_uses_objfile_iter, objfile); | |
1620 | } | |
1621 | ||
ac9a91a7 | 1622 | void |
fba45db2 | 1623 | _initialize_parse (void) |
ac9a91a7 JM |
1624 | { |
1625 | type_stack_size = 80; | |
1626 | type_stack_depth = 0; | |
1627 | type_stack = (union type_stack_elt *) | |
1628 | xmalloc (type_stack_size * sizeof (*type_stack)); | |
1629 | ||
85c07804 AC |
1630 | add_setshow_zinteger_cmd ("expression", class_maintenance, |
1631 | &expressiondebug, _("\ | |
1632 | Set expression debugging."), _("\ | |
1633 | Show expression debugging."), _("\ | |
1634 | When non-zero, the internal representation of expressions will be printed."), | |
1635 | NULL, | |
920d2a44 | 1636 | show_expressiondebug, |
85c07804 | 1637 | &setdebuglist, &showdebuglist); |
92981e24 TT |
1638 | add_setshow_boolean_cmd ("parser", class_maintenance, |
1639 | &parser_debug, _("\ | |
1640 | Set parser debugging."), _("\ | |
1641 | Show parser debugging."), _("\ | |
1642 | When non-zero, expression parser tracing will be enabled."), | |
1643 | NULL, | |
1644 | show_parserdebug, | |
1645 | &setdebuglist, &showdebuglist); | |
c906108c | 1646 | } |