Commit | Line | Data |
---|---|---|
c906108c | 1 | /* Parse expressions for GDB. |
c4a172b5 | 2 | |
197e01b6 | 3 | Copyright (C) 1986, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, |
0b4e1325 | 4 | 1997, 1998, 1999, 2000, 2001, 2004, 2005 Free Software Foundation, Inc. |
c4a172b5 | 5 | |
c906108c SS |
6 | Modified from expread.y by the Department of Computer Science at the |
7 | State University of New York at Buffalo, 1991. | |
8 | ||
c5aa993b | 9 | This file is part of GDB. |
c906108c | 10 | |
c5aa993b JM |
11 | This program is free software; you can redistribute it and/or modify |
12 | it under the terms of the GNU General Public License as published by | |
13 | the Free Software Foundation; either version 2 of the License, or | |
14 | (at your option) any later version. | |
c906108c | 15 | |
c5aa993b JM |
16 | This program is distributed in the hope that it will be useful, |
17 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | GNU General Public License for more details. | |
c906108c | 20 | |
c5aa993b JM |
21 | You should have received a copy of the GNU General Public License |
22 | along with this program; if not, write to the Free Software | |
197e01b6 EZ |
23 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
24 | Boston, MA 02110-1301, USA. */ | |
c906108c SS |
25 | |
26 | /* Parse an expression from text in a string, | |
27 | and return the result as a struct expression pointer. | |
28 | That structure contains arithmetic operations in reverse polish, | |
29 | with constants represented by operations that are followed by special data. | |
30 | See expression.h for the details of the format. | |
31 | What is important here is that it can be built up sequentially | |
32 | during the process of parsing; the lower levels of the tree always | |
33 | come first in the result. */ | |
c5aa993b | 34 | |
cce74817 JM |
35 | #include <ctype.h> |
36 | ||
c906108c SS |
37 | #include "defs.h" |
38 | #include "gdb_string.h" | |
c906108c SS |
39 | #include "symtab.h" |
40 | #include "gdbtypes.h" | |
41 | #include "frame.h" | |
42 | #include "expression.h" | |
43 | #include "value.h" | |
44 | #include "command.h" | |
45 | #include "language.h" | |
0b4e1325 | 46 | #include "f-lang.h" |
c906108c SS |
47 | #include "parser-defs.h" |
48 | #include "gdbcmd.h" | |
c5aa993b | 49 | #include "symfile.h" /* for overlay functions */ |
e2305d34 MS |
50 | #include "inferior.h" /* for NUM_PSEUDO_REGS. NOTE: replace |
51 | with "gdbarch.h" when appropriate. */ | |
d16aafd8 | 52 | #include "doublest.h" |
0406ec40 | 53 | #include "gdb_assert.h" |
fe898f56 | 54 | #include "block.h" |
59f92a09 | 55 | #include "source.h" |
9e35dae4 | 56 | #include "objfiles.h" |
e2305d34 | 57 | |
5f9769d1 PH |
58 | /* Standard set of definitions for printing, dumping, prefixifying, |
59 | * and evaluating expressions. */ | |
60 | ||
61 | const struct exp_descriptor exp_descriptor_standard = | |
62 | { | |
63 | print_subexp_standard, | |
64 | operator_length_standard, | |
65 | op_name_standard, | |
66 | dump_subexp_body_standard, | |
67 | evaluate_subexp_standard | |
68 | }; | |
c906108c SS |
69 | \f |
70 | /* Global variables declared in parser-defs.h (and commented there). */ | |
71 | struct expression *expout; | |
72 | int expout_size; | |
73 | int expout_ptr; | |
74 | struct block *expression_context_block; | |
84f0252a | 75 | CORE_ADDR expression_context_pc; |
c906108c SS |
76 | struct block *innermost_block; |
77 | int arglist_len; | |
78 | union type_stack_elt *type_stack; | |
79 | int type_stack_depth, type_stack_size; | |
80 | char *lexptr; | |
665132f9 | 81 | char *prev_lexptr; |
c906108c SS |
82 | int paren_depth; |
83 | int comma_terminates; | |
3a913e29 JB |
84 | |
85 | /* A temporary buffer for identifiers, so we can null-terminate them. | |
86 | ||
87 | We allocate this with xrealloc. parse_exp_1 used to allocate with | |
88 | alloca, using the size of the whole expression as a conservative | |
89 | estimate of the space needed. However, macro expansion can | |
90 | introduce names longer than the original expression; there's no | |
91 | practical way to know beforehand how large that might be. */ | |
92 | char *namecopy; | |
93 | size_t namecopy_size; | |
c906108c | 94 | \f |
c906108c | 95 | static int expressiondebug = 0; |
920d2a44 AC |
96 | static void |
97 | show_expressiondebug (struct ui_file *file, int from_tty, | |
98 | struct cmd_list_element *c, const char *value) | |
99 | { | |
100 | fprintf_filtered (file, _("Expression debugging is %s.\n"), value); | |
101 | } | |
c906108c | 102 | |
74b7792f | 103 | static void free_funcalls (void *ignore); |
c906108c | 104 | |
a14ed312 | 105 | static void prefixify_expression (struct expression *); |
c906108c | 106 | |
570b8f7c AC |
107 | static void prefixify_subexp (struct expression *, struct expression *, int, |
108 | int); | |
c906108c | 109 | |
e85c3284 PH |
110 | static struct expression *parse_exp_in_context (char **, struct block *, int, |
111 | int); | |
112 | ||
a14ed312 | 113 | void _initialize_parse (void); |
392a587b | 114 | |
c906108c SS |
115 | /* Data structure for saving values of arglist_len for function calls whose |
116 | arguments contain other function calls. */ | |
117 | ||
118 | struct funcall | |
119 | { | |
120 | struct funcall *next; | |
121 | int arglist_len; | |
122 | }; | |
123 | ||
124 | static struct funcall *funcall_chain; | |
125 | ||
c906108c SS |
126 | /* Begin counting arguments for a function call, |
127 | saving the data about any containing call. */ | |
128 | ||
129 | void | |
fba45db2 | 130 | start_arglist (void) |
c906108c | 131 | { |
f86f5ca3 | 132 | struct funcall *new; |
c906108c SS |
133 | |
134 | new = (struct funcall *) xmalloc (sizeof (struct funcall)); | |
135 | new->next = funcall_chain; | |
136 | new->arglist_len = arglist_len; | |
137 | arglist_len = 0; | |
138 | funcall_chain = new; | |
139 | } | |
140 | ||
141 | /* Return the number of arguments in a function call just terminated, | |
142 | and restore the data for the containing function call. */ | |
143 | ||
144 | int | |
fba45db2 | 145 | end_arglist (void) |
c906108c | 146 | { |
f86f5ca3 PH |
147 | int val = arglist_len; |
148 | struct funcall *call = funcall_chain; | |
c906108c SS |
149 | funcall_chain = call->next; |
150 | arglist_len = call->arglist_len; | |
b8c9b27d | 151 | xfree (call); |
c906108c SS |
152 | return val; |
153 | } | |
154 | ||
155 | /* Free everything in the funcall chain. | |
156 | Used when there is an error inside parsing. */ | |
157 | ||
158 | static void | |
74b7792f | 159 | free_funcalls (void *ignore) |
c906108c | 160 | { |
f86f5ca3 | 161 | struct funcall *call, *next; |
c906108c SS |
162 | |
163 | for (call = funcall_chain; call; call = next) | |
164 | { | |
165 | next = call->next; | |
b8c9b27d | 166 | xfree (call); |
c906108c SS |
167 | } |
168 | } | |
169 | \f | |
170 | /* This page contains the functions for adding data to the struct expression | |
171 | being constructed. */ | |
172 | ||
173 | /* Add one element to the end of the expression. */ | |
174 | ||
175 | /* To avoid a bug in the Sun 4 compiler, we pass things that can fit into | |
176 | a register through here */ | |
177 | ||
178 | void | |
fba45db2 | 179 | write_exp_elt (union exp_element expelt) |
c906108c SS |
180 | { |
181 | if (expout_ptr >= expout_size) | |
182 | { | |
183 | expout_size *= 2; | |
184 | expout = (struct expression *) | |
185 | xrealloc ((char *) expout, sizeof (struct expression) | |
186 | + EXP_ELEM_TO_BYTES (expout_size)); | |
187 | } | |
188 | expout->elts[expout_ptr++] = expelt; | |
189 | } | |
190 | ||
191 | void | |
fba45db2 | 192 | write_exp_elt_opcode (enum exp_opcode expelt) |
c906108c SS |
193 | { |
194 | union exp_element tmp; | |
09153d55 | 195 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
196 | |
197 | tmp.opcode = expelt; | |
198 | ||
199 | write_exp_elt (tmp); | |
200 | } | |
201 | ||
202 | void | |
fba45db2 | 203 | write_exp_elt_sym (struct symbol *expelt) |
c906108c SS |
204 | { |
205 | union exp_element tmp; | |
09153d55 | 206 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
207 | |
208 | tmp.symbol = expelt; | |
209 | ||
210 | write_exp_elt (tmp); | |
211 | } | |
212 | ||
213 | void | |
fba45db2 | 214 | write_exp_elt_block (struct block *b) |
c906108c SS |
215 | { |
216 | union exp_element tmp; | |
09153d55 | 217 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
218 | tmp.block = b; |
219 | write_exp_elt (tmp); | |
220 | } | |
221 | ||
9e35dae4 DJ |
222 | void |
223 | write_exp_elt_objfile (struct objfile *objfile) | |
224 | { | |
225 | union exp_element tmp; | |
226 | memset (&tmp, 0, sizeof (union exp_element)); | |
227 | tmp.objfile = objfile; | |
228 | write_exp_elt (tmp); | |
229 | } | |
230 | ||
c906108c | 231 | void |
fba45db2 | 232 | write_exp_elt_longcst (LONGEST expelt) |
c906108c SS |
233 | { |
234 | union exp_element tmp; | |
09153d55 | 235 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
236 | |
237 | tmp.longconst = expelt; | |
238 | ||
239 | write_exp_elt (tmp); | |
240 | } | |
241 | ||
242 | void | |
fba45db2 | 243 | write_exp_elt_dblcst (DOUBLEST expelt) |
c906108c SS |
244 | { |
245 | union exp_element tmp; | |
09153d55 | 246 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
247 | |
248 | tmp.doubleconst = expelt; | |
249 | ||
250 | write_exp_elt (tmp); | |
251 | } | |
252 | ||
253 | void | |
fba45db2 | 254 | write_exp_elt_type (struct type *expelt) |
c906108c SS |
255 | { |
256 | union exp_element tmp; | |
09153d55 | 257 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
258 | |
259 | tmp.type = expelt; | |
260 | ||
261 | write_exp_elt (tmp); | |
262 | } | |
263 | ||
264 | void | |
fba45db2 | 265 | write_exp_elt_intern (struct internalvar *expelt) |
c906108c SS |
266 | { |
267 | union exp_element tmp; | |
09153d55 | 268 | memset (&tmp, 0, sizeof (union exp_element)); |
c906108c SS |
269 | |
270 | tmp.internalvar = expelt; | |
271 | ||
272 | write_exp_elt (tmp); | |
273 | } | |
274 | ||
275 | /* Add a string constant to the end of the expression. | |
276 | ||
277 | String constants are stored by first writing an expression element | |
278 | that contains the length of the string, then stuffing the string | |
279 | constant itself into however many expression elements are needed | |
280 | to hold it, and then writing another expression element that contains | |
281 | the length of the string. I.E. an expression element at each end of | |
282 | the string records the string length, so you can skip over the | |
283 | expression elements containing the actual string bytes from either | |
284 | end of the string. Note that this also allows gdb to handle | |
285 | strings with embedded null bytes, as is required for some languages. | |
286 | ||
287 | Don't be fooled by the fact that the string is null byte terminated, | |
288 | this is strictly for the convenience of debugging gdb itself. Gdb | |
289 | Gdb does not depend up the string being null terminated, since the | |
290 | actual length is recorded in expression elements at each end of the | |
291 | string. The null byte is taken into consideration when computing how | |
292 | many expression elements are required to hold the string constant, of | |
293 | course. */ | |
294 | ||
295 | ||
296 | void | |
fba45db2 | 297 | write_exp_string (struct stoken str) |
c906108c | 298 | { |
f86f5ca3 PH |
299 | int len = str.length; |
300 | int lenelt; | |
301 | char *strdata; | |
c906108c SS |
302 | |
303 | /* Compute the number of expression elements required to hold the string | |
304 | (including a null byte terminator), along with one expression element | |
305 | at each end to record the actual string length (not including the | |
306 | null byte terminator). */ | |
307 | ||
308 | lenelt = 2 + BYTES_TO_EXP_ELEM (len + 1); | |
309 | ||
310 | /* Ensure that we have enough available expression elements to store | |
311 | everything. */ | |
312 | ||
313 | if ((expout_ptr + lenelt) >= expout_size) | |
314 | { | |
315 | expout_size = max (expout_size * 2, expout_ptr + lenelt + 10); | |
316 | expout = (struct expression *) | |
317 | xrealloc ((char *) expout, (sizeof (struct expression) | |
318 | + EXP_ELEM_TO_BYTES (expout_size))); | |
319 | } | |
320 | ||
321 | /* Write the leading length expression element (which advances the current | |
322 | expression element index), then write the string constant followed by a | |
323 | terminating null byte, and then write the trailing length expression | |
324 | element. */ | |
325 | ||
326 | write_exp_elt_longcst ((LONGEST) len); | |
327 | strdata = (char *) &expout->elts[expout_ptr]; | |
328 | memcpy (strdata, str.ptr, len); | |
329 | *(strdata + len) = '\0'; | |
330 | expout_ptr += lenelt - 2; | |
331 | write_exp_elt_longcst ((LONGEST) len); | |
332 | } | |
333 | ||
334 | /* Add a bitstring constant to the end of the expression. | |
335 | ||
336 | Bitstring constants are stored by first writing an expression element | |
337 | that contains the length of the bitstring (in bits), then stuffing the | |
338 | bitstring constant itself into however many expression elements are | |
339 | needed to hold it, and then writing another expression element that | |
340 | contains the length of the bitstring. I.E. an expression element at | |
341 | each end of the bitstring records the bitstring length, so you can skip | |
342 | over the expression elements containing the actual bitstring bytes from | |
343 | either end of the bitstring. */ | |
344 | ||
345 | void | |
fba45db2 | 346 | write_exp_bitstring (struct stoken str) |
c906108c | 347 | { |
f86f5ca3 PH |
348 | int bits = str.length; /* length in bits */ |
349 | int len = (bits + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; | |
350 | int lenelt; | |
351 | char *strdata; | |
c906108c SS |
352 | |
353 | /* Compute the number of expression elements required to hold the bitstring, | |
354 | along with one expression element at each end to record the actual | |
355 | bitstring length in bits. */ | |
356 | ||
357 | lenelt = 2 + BYTES_TO_EXP_ELEM (len); | |
358 | ||
359 | /* Ensure that we have enough available expression elements to store | |
360 | everything. */ | |
361 | ||
362 | if ((expout_ptr + lenelt) >= expout_size) | |
363 | { | |
364 | expout_size = max (expout_size * 2, expout_ptr + lenelt + 10); | |
365 | expout = (struct expression *) | |
366 | xrealloc ((char *) expout, (sizeof (struct expression) | |
367 | + EXP_ELEM_TO_BYTES (expout_size))); | |
368 | } | |
369 | ||
370 | /* Write the leading length expression element (which advances the current | |
371 | expression element index), then write the bitstring constant, and then | |
372 | write the trailing length expression element. */ | |
373 | ||
374 | write_exp_elt_longcst ((LONGEST) bits); | |
375 | strdata = (char *) &expout->elts[expout_ptr]; | |
376 | memcpy (strdata, str.ptr, len); | |
377 | expout_ptr += lenelt - 2; | |
378 | write_exp_elt_longcst ((LONGEST) bits); | |
379 | } | |
380 | ||
381 | /* Add the appropriate elements for a minimal symbol to the end of | |
382 | the expression. The rationale behind passing in text_symbol_type and | |
383 | data_symbol_type was so that Modula-2 could pass in WORD for | |
384 | data_symbol_type. Perhaps it still is useful to have those types vary | |
385 | based on the language, but they no longer have names like "int", so | |
386 | the initial rationale is gone. */ | |
387 | ||
388 | static struct type *msym_text_symbol_type; | |
389 | static struct type *msym_data_symbol_type; | |
390 | static struct type *msym_unknown_symbol_type; | |
9e35dae4 | 391 | static struct type *msym_tls_symbol_type; |
c906108c SS |
392 | |
393 | void | |
a858089e MS |
394 | write_exp_msymbol (struct minimal_symbol *msymbol, |
395 | struct type *text_symbol_type, | |
396 | struct type *data_symbol_type) | |
c906108c SS |
397 | { |
398 | CORE_ADDR addr; | |
399 | ||
400 | write_exp_elt_opcode (OP_LONG); | |
a858089e MS |
401 | /* Let's make the type big enough to hold a 64-bit address. */ |
402 | write_exp_elt_type (builtin_type_CORE_ADDR); | |
c906108c SS |
403 | |
404 | addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
405 | if (overlay_debugging) | |
406 | addr = symbol_overlayed_address (addr, SYMBOL_BFD_SECTION (msymbol)); | |
407 | write_exp_elt_longcst ((LONGEST) addr); | |
c5aa993b | 408 | |
c906108c SS |
409 | write_exp_elt_opcode (OP_LONG); |
410 | ||
9e35dae4 DJ |
411 | if (SYMBOL_BFD_SECTION (msymbol)->flags & SEC_THREAD_LOCAL) |
412 | { | |
413 | bfd *bfd = SYMBOL_BFD_SECTION (msymbol)->owner; | |
414 | struct objfile *ofp; | |
415 | ||
416 | ALL_OBJFILES (ofp) | |
417 | if (ofp->obfd == bfd) | |
418 | break; | |
419 | ||
420 | write_exp_elt_opcode (UNOP_MEMVAL_TLS); | |
421 | write_exp_elt_objfile (ofp); | |
422 | write_exp_elt_type (msym_tls_symbol_type); | |
423 | write_exp_elt_opcode (UNOP_MEMVAL_TLS); | |
424 | return; | |
425 | } | |
426 | ||
c906108c | 427 | write_exp_elt_opcode (UNOP_MEMVAL); |
c5aa993b | 428 | switch (msymbol->type) |
c906108c SS |
429 | { |
430 | case mst_text: | |
431 | case mst_file_text: | |
432 | case mst_solib_trampoline: | |
433 | write_exp_elt_type (msym_text_symbol_type); | |
434 | break; | |
435 | ||
436 | case mst_data: | |
437 | case mst_file_data: | |
438 | case mst_bss: | |
439 | case mst_file_bss: | |
440 | write_exp_elt_type (msym_data_symbol_type); | |
441 | break; | |
442 | ||
443 | default: | |
444 | write_exp_elt_type (msym_unknown_symbol_type); | |
445 | break; | |
446 | } | |
447 | write_exp_elt_opcode (UNOP_MEMVAL); | |
448 | } | |
449 | \f | |
450 | /* Recognize tokens that start with '$'. These include: | |
451 | ||
c5aa993b JM |
452 | $regname A native register name or a "standard |
453 | register name". | |
c906108c | 454 | |
c5aa993b JM |
455 | $variable A convenience variable with a name chosen |
456 | by the user. | |
c906108c | 457 | |
c5aa993b JM |
458 | $digits Value history with index <digits>, starting |
459 | from the first value which has index 1. | |
c906108c | 460 | |
c5aa993b JM |
461 | $$digits Value history with index <digits> relative |
462 | to the last value. I.E. $$0 is the last | |
463 | value, $$1 is the one previous to that, $$2 | |
464 | is the one previous to $$1, etc. | |
c906108c | 465 | |
c5aa993b | 466 | $ | $0 | $$0 The last value in the value history. |
c906108c | 467 | |
c5aa993b JM |
468 | $$ An abbreviation for the second to the last |
469 | value in the value history, I.E. $$1 | |
c906108c | 470 | |
c5aa993b | 471 | */ |
c906108c SS |
472 | |
473 | void | |
fba45db2 | 474 | write_dollar_variable (struct stoken str) |
c906108c | 475 | { |
d7318818 RC |
476 | struct symbol *sym = NULL; |
477 | struct minimal_symbol *msym = NULL; | |
478 | ||
c906108c SS |
479 | /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1) |
480 | and $$digits (equivalent to $<-digits> if you could type that). */ | |
481 | ||
c906108c SS |
482 | int negate = 0; |
483 | int i = 1; | |
484 | /* Double dollar means negate the number and add -1 as well. | |
485 | Thus $$ alone means -1. */ | |
486 | if (str.length >= 2 && str.ptr[1] == '$') | |
487 | { | |
488 | negate = 1; | |
489 | i = 2; | |
490 | } | |
491 | if (i == str.length) | |
492 | { | |
493 | /* Just dollars (one or two) */ | |
c5aa993b | 494 | i = -negate; |
c906108c SS |
495 | goto handle_last; |
496 | } | |
497 | /* Is the rest of the token digits? */ | |
498 | for (; i < str.length; i++) | |
499 | if (!(str.ptr[i] >= '0' && str.ptr[i] <= '9')) | |
500 | break; | |
501 | if (i == str.length) | |
502 | { | |
503 | i = atoi (str.ptr + 1 + negate); | |
504 | if (negate) | |
c5aa993b | 505 | i = -i; |
c906108c SS |
506 | goto handle_last; |
507 | } | |
c5aa993b | 508 | |
c906108c SS |
509 | /* Handle tokens that refer to machine registers: |
510 | $ followed by a register name. */ | |
eb8bc282 AC |
511 | i = frame_map_name_to_regnum (deprecated_selected_frame, |
512 | str.ptr + 1, str.length - 1); | |
c5aa993b | 513 | if (i >= 0) |
c906108c SS |
514 | goto handle_register; |
515 | ||
d7318818 RC |
516 | /* On some systems, such as HP-UX and hppa-linux, certain system routines |
517 | have names beginning with $ or $$. Check for those, first. */ | |
518 | ||
519 | sym = lookup_symbol (copy_name (str), (struct block *) NULL, | |
520 | VAR_DOMAIN, (int *) NULL, (struct symtab **) NULL); | |
521 | if (sym) | |
522 | { | |
523 | write_exp_elt_opcode (OP_VAR_VALUE); | |
524 | write_exp_elt_block (block_found); /* set by lookup_symbol */ | |
525 | write_exp_elt_sym (sym); | |
526 | write_exp_elt_opcode (OP_VAR_VALUE); | |
527 | return; | |
528 | } | |
529 | msym = lookup_minimal_symbol (copy_name (str), NULL, NULL); | |
530 | if (msym) | |
c906108c | 531 | { |
d7318818 RC |
532 | write_exp_msymbol (msym, |
533 | lookup_function_type (builtin_type_int), | |
534 | builtin_type_int); | |
535 | return; | |
c906108c | 536 | } |
c5aa993b | 537 | |
c906108c SS |
538 | /* Any other names starting in $ are debugger internal variables. */ |
539 | ||
540 | write_exp_elt_opcode (OP_INTERNALVAR); | |
541 | write_exp_elt_intern (lookup_internalvar (copy_name (str) + 1)); | |
c5aa993b | 542 | write_exp_elt_opcode (OP_INTERNALVAR); |
c906108c | 543 | return; |
c5aa993b | 544 | handle_last: |
c906108c SS |
545 | write_exp_elt_opcode (OP_LAST); |
546 | write_exp_elt_longcst ((LONGEST) i); | |
547 | write_exp_elt_opcode (OP_LAST); | |
548 | return; | |
c5aa993b | 549 | handle_register: |
c906108c SS |
550 | write_exp_elt_opcode (OP_REGISTER); |
551 | write_exp_elt_longcst (i); | |
c5aa993b | 552 | write_exp_elt_opcode (OP_REGISTER); |
c906108c SS |
553 | return; |
554 | } | |
555 | ||
556 | ||
557 | /* Parse a string that is possibly a namespace / nested class | |
558 | specification, i.e., something of the form A::B::C::x. Input | |
559 | (NAME) is the entire string; LEN is the current valid length; the | |
560 | output is a string, TOKEN, which points to the largest recognized | |
561 | prefix which is a series of namespaces or classes. CLASS_PREFIX is | |
562 | another output, which records whether a nested class spec was | |
563 | recognized (= 1) or a fully qualified variable name was found (= | |
564 | 0). ARGPTR is side-effected (if non-NULL) to point to beyond the | |
565 | string recognized and consumed by this routine. | |
566 | ||
567 | The return value is a pointer to the symbol for the base class or | |
568 | variable if found, or NULL if not found. Callers must check this | |
569 | first -- if NULL, the outputs may not be correct. | |
570 | ||
571 | This function is used c-exp.y. This is used specifically to get | |
572 | around HP aCC (and possibly other compilers), which insists on | |
573 | generating names with embedded colons for namespace or nested class | |
574 | members. | |
575 | ||
576 | (Argument LEN is currently unused. 1997-08-27) | |
577 | ||
578 | Callers must free memory allocated for the output string TOKEN. */ | |
579 | ||
c5aa993b JM |
580 | static const char coloncolon[2] = |
581 | {':', ':'}; | |
c906108c SS |
582 | |
583 | struct symbol * | |
fba45db2 KB |
584 | parse_nested_classes_for_hpacc (char *name, int len, char **token, |
585 | int *class_prefix, char **argptr) | |
c906108c | 586 | { |
c5aa993b JM |
587 | /* Comment below comes from decode_line_1 which has very similar |
588 | code, which is called for "break" command parsing. */ | |
589 | ||
590 | /* We have what looks like a class or namespace | |
c906108c SS |
591 | scope specification (A::B), possibly with many |
592 | levels of namespaces or classes (A::B::C::D). | |
593 | ||
594 | Some versions of the HP ANSI C++ compiler (as also possibly | |
595 | other compilers) generate class/function/member names with | |
596 | embedded double-colons if they are inside namespaces. To | |
597 | handle this, we loop a few times, considering larger and | |
598 | larger prefixes of the string as though they were single | |
599 | symbols. So, if the initially supplied string is | |
600 | A::B::C::D::foo, we have to look up "A", then "A::B", | |
601 | then "A::B::C", then "A::B::C::D", and finally | |
602 | "A::B::C::D::foo" as single, monolithic symbols, because | |
603 | A, B, C or D may be namespaces. | |
604 | ||
605 | Note that namespaces can nest only inside other | |
606 | namespaces, and not inside classes. So we need only | |
607 | consider *prefixes* of the string; there is no need to look up | |
608 | "B::C" separately as a symbol in the previous example. */ | |
609 | ||
f86f5ca3 | 610 | char *p; |
c5aa993b JM |
611 | char *start, *end; |
612 | char *prefix = NULL; | |
613 | char *tmp; | |
614 | struct symbol *sym_class = NULL; | |
615 | struct symbol *sym_var = NULL; | |
616 | struct type *t; | |
c906108c SS |
617 | int prefix_len = 0; |
618 | int done = 0; | |
c5aa993b | 619 | char *q; |
c906108c SS |
620 | |
621 | /* Check for HP-compiled executable -- in other cases | |
622 | return NULL, and caller must default to standard GDB | |
623 | behaviour. */ | |
624 | ||
f83f82bc | 625 | if (!deprecated_hp_som_som_object_present) |
c906108c SS |
626 | return (struct symbol *) NULL; |
627 | ||
628 | p = name; | |
629 | ||
c5aa993b JM |
630 | /* Skip over whitespace and possible global "::" */ |
631 | while (*p && (*p == ' ' || *p == '\t')) | |
632 | p++; | |
c906108c SS |
633 | if (p[0] == ':' && p[1] == ':') |
634 | p += 2; | |
c5aa993b JM |
635 | while (*p && (*p == ' ' || *p == '\t')) |
636 | p++; | |
637 | ||
c906108c SS |
638 | while (1) |
639 | { | |
640 | /* Get to the end of the next namespace or class spec. */ | |
641 | /* If we're looking at some non-token, fail immediately */ | |
642 | start = p; | |
643 | if (!(isalpha (*p) || *p == '$' || *p == '_')) | |
c5aa993b | 644 | return (struct symbol *) NULL; |
c906108c | 645 | p++; |
c5aa993b JM |
646 | while (*p && (isalnum (*p) || *p == '$' || *p == '_')) |
647 | p++; | |
648 | ||
649 | if (*p == '<') | |
650 | { | |
651 | /* If we have the start of a template specification, | |
652 | scan right ahead to its end */ | |
653 | q = find_template_name_end (p); | |
654 | if (q) | |
655 | p = q; | |
656 | } | |
657 | ||
c906108c SS |
658 | end = p; |
659 | ||
c5aa993b JM |
660 | /* Skip over "::" and whitespace for next time around */ |
661 | while (*p && (*p == ' ' || *p == '\t')) | |
662 | p++; | |
c906108c | 663 | if (p[0] == ':' && p[1] == ':') |
c5aa993b JM |
664 | p += 2; |
665 | while (*p && (*p == ' ' || *p == '\t')) | |
666 | p++; | |
c906108c | 667 | |
c5aa993b | 668 | /* Done with tokens? */ |
c906108c | 669 | if (!*p || !(isalpha (*p) || *p == '$' || *p == '_')) |
c5aa993b | 670 | done = 1; |
c906108c SS |
671 | |
672 | tmp = (char *) alloca (prefix_len + end - start + 3); | |
673 | if (prefix) | |
c5aa993b JM |
674 | { |
675 | memcpy (tmp, prefix, prefix_len); | |
676 | memcpy (tmp + prefix_len, coloncolon, 2); | |
677 | memcpy (tmp + prefix_len + 2, start, end - start); | |
678 | tmp[prefix_len + 2 + end - start] = '\000'; | |
679 | } | |
c906108c | 680 | else |
c5aa993b JM |
681 | { |
682 | memcpy (tmp, start, end - start); | |
683 | tmp[end - start] = '\000'; | |
684 | } | |
685 | ||
c906108c SS |
686 | prefix = tmp; |
687 | prefix_len = strlen (prefix); | |
c5aa993b | 688 | |
c906108c SS |
689 | /* See if the prefix we have now is something we know about */ |
690 | ||
c5aa993b JM |
691 | if (!done) |
692 | { | |
693 | /* More tokens to process, so this must be a class/namespace */ | |
176620f1 | 694 | sym_class = lookup_symbol (prefix, 0, STRUCT_DOMAIN, |
c5aa993b JM |
695 | 0, (struct symtab **) NULL); |
696 | } | |
c906108c | 697 | else |
c5aa993b JM |
698 | { |
699 | /* No more tokens, so try as a variable first */ | |
176620f1 | 700 | sym_var = lookup_symbol (prefix, 0, VAR_DOMAIN, |
c5aa993b JM |
701 | 0, (struct symtab **) NULL); |
702 | /* If failed, try as class/namespace */ | |
703 | if (!sym_var) | |
176620f1 | 704 | sym_class = lookup_symbol (prefix, 0, STRUCT_DOMAIN, |
c5aa993b JM |
705 | 0, (struct symtab **) NULL); |
706 | } | |
c906108c SS |
707 | |
708 | if (sym_var || | |
c5aa993b JM |
709 | (sym_class && |
710 | (t = check_typedef (SYMBOL_TYPE (sym_class)), | |
711 | (TYPE_CODE (t) == TYPE_CODE_STRUCT | |
712 | || TYPE_CODE (t) == TYPE_CODE_UNION)))) | |
713 | { | |
714 | /* We found a valid token */ | |
715 | *token = (char *) xmalloc (prefix_len + 1); | |
716 | memcpy (*token, prefix, prefix_len); | |
717 | (*token)[prefix_len] = '\000'; | |
718 | break; | |
719 | } | |
720 | ||
721 | /* No variable or class/namespace found, no more tokens */ | |
c906108c | 722 | if (done) |
c5aa993b | 723 | return (struct symbol *) NULL; |
c906108c SS |
724 | } |
725 | ||
726 | /* Out of loop, so we must have found a valid token */ | |
727 | if (sym_var) | |
728 | *class_prefix = 0; | |
729 | else | |
730 | *class_prefix = 1; | |
731 | ||
732 | if (argptr) | |
733 | *argptr = done ? p : end; | |
734 | ||
c5aa993b | 735 | return sym_var ? sym_var : sym_class; /* found */ |
c906108c SS |
736 | } |
737 | ||
738 | char * | |
fba45db2 | 739 | find_template_name_end (char *p) |
c906108c SS |
740 | { |
741 | int depth = 1; | |
742 | int just_seen_right = 0; | |
743 | int just_seen_colon = 0; | |
744 | int just_seen_space = 0; | |
c5aa993b | 745 | |
c906108c SS |
746 | if (!p || (*p != '<')) |
747 | return 0; | |
748 | ||
749 | while (*++p) | |
750 | { | |
751 | switch (*p) | |
c5aa993b JM |
752 | { |
753 | case '\'': | |
754 | case '\"': | |
755 | case '{': | |
756 | case '}': | |
757 | /* In future, may want to allow these?? */ | |
758 | return 0; | |
759 | case '<': | |
760 | depth++; /* start nested template */ | |
761 | if (just_seen_colon || just_seen_right || just_seen_space) | |
762 | return 0; /* but not after : or :: or > or space */ | |
763 | break; | |
764 | case '>': | |
765 | if (just_seen_colon || just_seen_right) | |
766 | return 0; /* end a (nested?) template */ | |
767 | just_seen_right = 1; /* but not after : or :: */ | |
768 | if (--depth == 0) /* also disallow >>, insist on > > */ | |
769 | return ++p; /* if outermost ended, return */ | |
770 | break; | |
771 | case ':': | |
772 | if (just_seen_space || (just_seen_colon > 1)) | |
773 | return 0; /* nested class spec coming up */ | |
774 | just_seen_colon++; /* we allow :: but not :::: */ | |
775 | break; | |
776 | case ' ': | |
777 | break; | |
778 | default: | |
779 | if (!((*p >= 'a' && *p <= 'z') || /* allow token chars */ | |
780 | (*p >= 'A' && *p <= 'Z') || | |
781 | (*p >= '0' && *p <= '9') || | |
782 | (*p == '_') || (*p == ',') || /* commas for template args */ | |
783 | (*p == '&') || (*p == '*') || /* pointer and ref types */ | |
784 | (*p == '(') || (*p == ')') || /* function types */ | |
785 | (*p == '[') || (*p == ']'))) /* array types */ | |
786 | return 0; | |
787 | } | |
c906108c | 788 | if (*p != ' ') |
c5aa993b | 789 | just_seen_space = 0; |
c906108c | 790 | if (*p != ':') |
c5aa993b | 791 | just_seen_colon = 0; |
c906108c | 792 | if (*p != '>') |
c5aa993b | 793 | just_seen_right = 0; |
c906108c SS |
794 | } |
795 | return 0; | |
796 | } | |
c5aa993b | 797 | \f |
c906108c SS |
798 | |
799 | ||
c906108c SS |
800 | /* Return a null-terminated temporary copy of the name |
801 | of a string token. */ | |
802 | ||
803 | char * | |
fba45db2 | 804 | copy_name (struct stoken token) |
c906108c | 805 | { |
3a913e29 JB |
806 | /* Make sure there's enough space for the token. */ |
807 | if (namecopy_size < token.length + 1) | |
808 | { | |
809 | namecopy_size = token.length + 1; | |
810 | namecopy = xrealloc (namecopy, token.length + 1); | |
811 | } | |
812 | ||
c906108c SS |
813 | memcpy (namecopy, token.ptr, token.length); |
814 | namecopy[token.length] = 0; | |
3a913e29 | 815 | |
c906108c SS |
816 | return namecopy; |
817 | } | |
818 | \f | |
819 | /* Reverse an expression from suffix form (in which it is constructed) | |
820 | to prefix form (in which we can conveniently print or execute it). */ | |
821 | ||
822 | static void | |
f86f5ca3 | 823 | prefixify_expression (struct expression *expr) |
c906108c | 824 | { |
f86f5ca3 | 825 | int len = |
c5aa993b | 826 | sizeof (struct expression) + EXP_ELEM_TO_BYTES (expr->nelts); |
f86f5ca3 PH |
827 | struct expression *temp; |
828 | int inpos = expr->nelts, outpos = 0; | |
c906108c SS |
829 | |
830 | temp = (struct expression *) alloca (len); | |
831 | ||
832 | /* Copy the original expression into temp. */ | |
833 | memcpy (temp, expr, len); | |
834 | ||
835 | prefixify_subexp (temp, expr, inpos, outpos); | |
836 | } | |
837 | ||
24daaebc PH |
838 | /* Return the number of exp_elements in the postfix subexpression |
839 | of EXPR whose operator is at index ENDPOS - 1 in EXPR. */ | |
c906108c SS |
840 | |
841 | int | |
f86f5ca3 | 842 | length_of_subexp (struct expression *expr, int endpos) |
24daaebc PH |
843 | { |
844 | int oplen, args, i; | |
845 | ||
846 | operator_length (expr, endpos, &oplen, &args); | |
847 | ||
848 | while (args > 0) | |
849 | { | |
850 | oplen += length_of_subexp (expr, endpos - oplen); | |
851 | args--; | |
852 | } | |
853 | ||
854 | return oplen; | |
855 | } | |
856 | ||
857 | /* Sets *OPLENP to the length of the operator whose (last) index is | |
858 | ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that | |
859 | operator takes. */ | |
860 | ||
861 | void | |
862 | operator_length (struct expression *expr, int endpos, int *oplenp, int *argsp) | |
5f9769d1 PH |
863 | { |
864 | expr->language_defn->la_exp_desc->operator_length (expr, endpos, | |
865 | oplenp, argsp); | |
866 | } | |
867 | ||
868 | /* Default value for operator_length in exp_descriptor vectors. */ | |
869 | ||
870 | void | |
871 | operator_length_standard (struct expression *expr, int endpos, | |
872 | int *oplenp, int *argsp) | |
c906108c | 873 | { |
f86f5ca3 PH |
874 | int oplen = 1; |
875 | int args = 0; | |
0b4e1325 | 876 | enum f90_range_type range_type; |
f86f5ca3 | 877 | int i; |
c906108c SS |
878 | |
879 | if (endpos < 1) | |
8a3fe4f8 | 880 | error (_("?error in operator_length_standard")); |
c906108c SS |
881 | |
882 | i = (int) expr->elts[endpos - 1].opcode; | |
883 | ||
884 | switch (i) | |
885 | { | |
886 | /* C++ */ | |
887 | case OP_SCOPE: | |
888 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); | |
889 | oplen = 5 + BYTES_TO_EXP_ELEM (oplen + 1); | |
890 | break; | |
891 | ||
892 | case OP_LONG: | |
893 | case OP_DOUBLE: | |
894 | case OP_VAR_VALUE: | |
895 | oplen = 4; | |
896 | break; | |
897 | ||
898 | case OP_TYPE: | |
899 | case OP_BOOL: | |
900 | case OP_LAST: | |
901 | case OP_REGISTER: | |
902 | case OP_INTERNALVAR: | |
903 | oplen = 3; | |
904 | break; | |
905 | ||
906 | case OP_COMPLEX: | |
c5aa993b | 907 | oplen = 1; |
c906108c | 908 | args = 2; |
c5aa993b | 909 | break; |
c906108c SS |
910 | |
911 | case OP_FUNCALL: | |
912 | case OP_F77_UNDETERMINED_ARGLIST: | |
913 | oplen = 3; | |
914 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); | |
915 | break; | |
916 | ||
646df18d | 917 | case OP_OBJC_MSGCALL: /* Objective C message (method) call */ |
53c551b7 AF |
918 | oplen = 4; |
919 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); | |
920 | break; | |
921 | ||
c906108c SS |
922 | case UNOP_MAX: |
923 | case UNOP_MIN: | |
924 | oplen = 3; | |
925 | break; | |
926 | ||
c5aa993b JM |
927 | case BINOP_VAL: |
928 | case UNOP_CAST: | |
929 | case UNOP_MEMVAL: | |
c906108c SS |
930 | oplen = 3; |
931 | args = 1; | |
932 | break; | |
933 | ||
9e35dae4 DJ |
934 | case UNOP_MEMVAL_TLS: |
935 | oplen = 4; | |
936 | args = 1; | |
937 | break; | |
938 | ||
c906108c SS |
939 | case UNOP_ABS: |
940 | case UNOP_CAP: | |
941 | case UNOP_CHR: | |
942 | case UNOP_FLOAT: | |
943 | case UNOP_HIGH: | |
944 | case UNOP_ODD: | |
945 | case UNOP_ORD: | |
946 | case UNOP_TRUNC: | |
947 | oplen = 1; | |
948 | args = 1; | |
949 | break; | |
950 | ||
951 | case OP_LABELED: | |
952 | case STRUCTOP_STRUCT: | |
953 | case STRUCTOP_PTR: | |
954 | args = 1; | |
955 | /* fall through */ | |
956 | case OP_M2_STRING: | |
957 | case OP_STRING: | |
646df18d AF |
958 | case OP_OBJC_NSSTRING: /* Objective C Foundation Class NSString constant */ |
959 | case OP_OBJC_SELECTOR: /* Objective C "@selector" pseudo-op */ | |
c906108c SS |
960 | case OP_NAME: |
961 | case OP_EXPRSTRING: | |
962 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); | |
963 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1); | |
964 | break; | |
965 | ||
966 | case OP_BITSTRING: | |
967 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); | |
968 | oplen = (oplen + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; | |
969 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen); | |
970 | break; | |
971 | ||
972 | case OP_ARRAY: | |
973 | oplen = 4; | |
974 | args = longest_to_int (expr->elts[endpos - 2].longconst); | |
975 | args -= longest_to_int (expr->elts[endpos - 3].longconst); | |
976 | args += 1; | |
977 | break; | |
978 | ||
979 | case TERNOP_COND: | |
980 | case TERNOP_SLICE: | |
981 | case TERNOP_SLICE_COUNT: | |
982 | args = 3; | |
983 | break; | |
984 | ||
985 | /* Modula-2 */ | |
c5aa993b | 986 | case MULTI_SUBSCRIPT: |
c906108c | 987 | oplen = 3; |
c5aa993b | 988 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); |
c906108c SS |
989 | break; |
990 | ||
991 | case BINOP_ASSIGN_MODIFY: | |
992 | oplen = 3; | |
993 | args = 2; | |
994 | break; | |
995 | ||
996 | /* C++ */ | |
997 | case OP_THIS: | |
646df18d | 998 | case OP_OBJC_SELF: |
c906108c SS |
999 | oplen = 2; |
1000 | break; | |
1001 | ||
0b4e1325 WZ |
1002 | case OP_F90_RANGE: |
1003 | oplen = 3; | |
1004 | ||
1005 | range_type = longest_to_int (expr->elts[endpos - 2].longconst); | |
1006 | switch (range_type) | |
1007 | { | |
1008 | case LOW_BOUND_DEFAULT: | |
1009 | case HIGH_BOUND_DEFAULT: | |
1010 | args = 1; | |
1011 | break; | |
1012 | case BOTH_BOUND_DEFAULT: | |
1013 | args = 0; | |
1014 | break; | |
1015 | case NONE_BOUND_DEFAULT: | |
1016 | args = 2; | |
1017 | break; | |
1018 | } | |
1019 | ||
1020 | break; | |
1021 | ||
c906108c SS |
1022 | default: |
1023 | args = 1 + (i < (int) BINOP_END); | |
1024 | } | |
1025 | ||
24daaebc PH |
1026 | *oplenp = oplen; |
1027 | *argsp = args; | |
c906108c SS |
1028 | } |
1029 | ||
1030 | /* Copy the subexpression ending just before index INEND in INEXPR | |
1031 | into OUTEXPR, starting at index OUTBEG. | |
1032 | In the process, convert it from suffix to prefix form. */ | |
1033 | ||
1034 | static void | |
f86f5ca3 PH |
1035 | prefixify_subexp (struct expression *inexpr, |
1036 | struct expression *outexpr, int inend, int outbeg) | |
c906108c | 1037 | { |
24daaebc PH |
1038 | int oplen; |
1039 | int args; | |
f86f5ca3 | 1040 | int i; |
c906108c SS |
1041 | int *arglens; |
1042 | enum exp_opcode opcode; | |
1043 | ||
24daaebc | 1044 | operator_length (inexpr, inend, &oplen, &args); |
c906108c SS |
1045 | |
1046 | /* Copy the final operator itself, from the end of the input | |
1047 | to the beginning of the output. */ | |
1048 | inend -= oplen; | |
1049 | memcpy (&outexpr->elts[outbeg], &inexpr->elts[inend], | |
1050 | EXP_ELEM_TO_BYTES (oplen)); | |
1051 | outbeg += oplen; | |
1052 | ||
1053 | /* Find the lengths of the arg subexpressions. */ | |
1054 | arglens = (int *) alloca (args * sizeof (int)); | |
1055 | for (i = args - 1; i >= 0; i--) | |
1056 | { | |
1057 | oplen = length_of_subexp (inexpr, inend); | |
1058 | arglens[i] = oplen; | |
1059 | inend -= oplen; | |
1060 | } | |
1061 | ||
1062 | /* Now copy each subexpression, preserving the order of | |
1063 | the subexpressions, but prefixifying each one. | |
1064 | In this loop, inend starts at the beginning of | |
1065 | the expression this level is working on | |
1066 | and marches forward over the arguments. | |
1067 | outbeg does similarly in the output. */ | |
1068 | for (i = 0; i < args; i++) | |
1069 | { | |
1070 | oplen = arglens[i]; | |
1071 | inend += oplen; | |
1072 | prefixify_subexp (inexpr, outexpr, inend, outbeg); | |
1073 | outbeg += oplen; | |
1074 | } | |
1075 | } | |
1076 | \f | |
1077 | /* This page contains the two entry points to this file. */ | |
1078 | ||
1079 | /* Read an expression from the string *STRINGPTR points to, | |
1080 | parse it, and return a pointer to a struct expression that we malloc. | |
1081 | Use block BLOCK as the lexical context for variable names; | |
1082 | if BLOCK is zero, use the block of the selected stack frame. | |
1083 | Meanwhile, advance *STRINGPTR to point after the expression, | |
1084 | at the first nonwhite character that is not part of the expression | |
1085 | (possibly a null character). | |
1086 | ||
1087 | If COMMA is nonzero, stop if a comma is reached. */ | |
1088 | ||
1089 | struct expression * | |
fba45db2 | 1090 | parse_exp_1 (char **stringptr, struct block *block, int comma) |
e85c3284 PH |
1091 | { |
1092 | return parse_exp_in_context (stringptr, block, comma, 0); | |
1093 | } | |
1094 | ||
1095 | /* As for parse_exp_1, except that if VOID_CONTEXT_P, then | |
1096 | no value is expected from the expression. */ | |
1097 | ||
1098 | static struct expression * | |
1099 | parse_exp_in_context (char **stringptr, struct block *block, int comma, | |
1100 | int void_context_p) | |
c906108c SS |
1101 | { |
1102 | struct cleanup *old_chain; | |
1103 | ||
1104 | lexptr = *stringptr; | |
665132f9 | 1105 | prev_lexptr = NULL; |
c906108c SS |
1106 | |
1107 | paren_depth = 0; | |
1108 | type_stack_depth = 0; | |
1109 | ||
1110 | comma_terminates = comma; | |
1111 | ||
1112 | if (lexptr == 0 || *lexptr == 0) | |
e2e0b3e5 | 1113 | error_no_arg (_("expression to compute")); |
c906108c | 1114 | |
74b7792f | 1115 | old_chain = make_cleanup (free_funcalls, 0 /*ignore*/); |
c906108c SS |
1116 | funcall_chain = 0; |
1117 | ||
59f92a09 FF |
1118 | /* If no context specified, try using the current frame, if any. */ |
1119 | ||
1120 | if (!block) | |
1121 | block = get_selected_block (&expression_context_pc); | |
1122 | ||
1123 | /* Fall back to using the current source static context, if any. */ | |
1124 | ||
1125 | if (!block) | |
1126 | { | |
1127 | struct symtab_and_line cursal = get_current_source_symtab_and_line (); | |
1128 | if (cursal.symtab) | |
1129 | block = BLOCKVECTOR_BLOCK (BLOCKVECTOR (cursal.symtab), STATIC_BLOCK); | |
1130 | } | |
1131 | ||
1132 | /* Save the context, if specified by caller, or found above. */ | |
1133 | ||
84f0252a JB |
1134 | if (block) |
1135 | { | |
1136 | expression_context_block = block; | |
8da065d5 | 1137 | expression_context_pc = BLOCK_START (block); |
84f0252a | 1138 | } |
c906108c | 1139 | |
c906108c SS |
1140 | expout_size = 10; |
1141 | expout_ptr = 0; | |
1142 | expout = (struct expression *) | |
1143 | xmalloc (sizeof (struct expression) + EXP_ELEM_TO_BYTES (expout_size)); | |
1144 | expout->language_defn = current_language; | |
c13c43fd | 1145 | make_cleanup (free_current_contents, &expout); |
c906108c SS |
1146 | |
1147 | if (current_language->la_parser ()) | |
1148 | current_language->la_error (NULL); | |
1149 | ||
1150 | discard_cleanups (old_chain); | |
1151 | ||
1152 | /* Record the actual number of expression elements, and then | |
1153 | reallocate the expression memory so that we free up any | |
1154 | excess elements. */ | |
1155 | ||
1156 | expout->nelts = expout_ptr; | |
1157 | expout = (struct expression *) | |
1158 | xrealloc ((char *) expout, | |
1159 | sizeof (struct expression) + EXP_ELEM_TO_BYTES (expout_ptr));; | |
1160 | ||
1161 | /* Convert expression from postfix form as generated by yacc | |
1162 | parser, to a prefix form. */ | |
1163 | ||
c906108c | 1164 | if (expressiondebug) |
24daaebc PH |
1165 | dump_raw_expression (expout, gdb_stdlog, |
1166 | "before conversion to prefix form"); | |
c906108c SS |
1167 | |
1168 | prefixify_expression (expout); | |
1169 | ||
e85c3284 PH |
1170 | current_language->la_post_parser (&expout, void_context_p); |
1171 | ||
c906108c | 1172 | if (expressiondebug) |
24daaebc | 1173 | dump_prefix_expression (expout, gdb_stdlog); |
c906108c SS |
1174 | |
1175 | *stringptr = lexptr; | |
1176 | return expout; | |
1177 | } | |
1178 | ||
1179 | /* Parse STRING as an expression, and complain if this fails | |
1180 | to use up all of the contents of STRING. */ | |
1181 | ||
1182 | struct expression * | |
fba45db2 | 1183 | parse_expression (char *string) |
c906108c | 1184 | { |
f86f5ca3 | 1185 | struct expression *exp; |
c906108c SS |
1186 | exp = parse_exp_1 (&string, 0, 0); |
1187 | if (*string) | |
8a3fe4f8 | 1188 | error (_("Junk after end of expression.")); |
c906108c SS |
1189 | return exp; |
1190 | } | |
e85c3284 PH |
1191 | |
1192 | ||
1193 | /* As for parse_expression, except that if VOID_CONTEXT_P, then | |
1194 | no value is expected from the expression. */ | |
1195 | ||
1196 | struct expression * | |
1197 | parse_expression_in_context (char *string, int void_context_p) | |
1198 | { | |
1199 | struct expression *exp; | |
1200 | exp = parse_exp_in_context (&string, 0, 0, void_context_p); | |
1201 | if (*string != '\000') | |
8a3fe4f8 | 1202 | error (_("Junk after end of expression.")); |
e85c3284 PH |
1203 | return exp; |
1204 | } | |
1205 | ||
1206 | /* A post-parser that does nothing */ | |
1207 | ||
e85c3284 PH |
1208 | void |
1209 | null_post_parser (struct expression **exp, int void_context_p) | |
1210 | { | |
1211 | } | |
c906108c SS |
1212 | \f |
1213 | /* Stuff for maintaining a stack of types. Currently just used by C, but | |
1214 | probably useful for any language which declares its types "backwards". */ | |
1215 | ||
47663de5 MS |
1216 | static void |
1217 | check_type_stack_depth (void) | |
c906108c SS |
1218 | { |
1219 | if (type_stack_depth == type_stack_size) | |
1220 | { | |
1221 | type_stack_size *= 2; | |
1222 | type_stack = (union type_stack_elt *) | |
1223 | xrealloc ((char *) type_stack, type_stack_size * sizeof (*type_stack)); | |
1224 | } | |
47663de5 MS |
1225 | } |
1226 | ||
1227 | void | |
1228 | push_type (enum type_pieces tp) | |
1229 | { | |
1230 | check_type_stack_depth (); | |
c906108c SS |
1231 | type_stack[type_stack_depth++].piece = tp; |
1232 | } | |
1233 | ||
1234 | void | |
fba45db2 | 1235 | push_type_int (int n) |
c906108c | 1236 | { |
47663de5 | 1237 | check_type_stack_depth (); |
c906108c SS |
1238 | type_stack[type_stack_depth++].int_val = n; |
1239 | } | |
1240 | ||
47663de5 MS |
1241 | void |
1242 | push_type_address_space (char *string) | |
1243 | { | |
1244 | push_type_int (address_space_name_to_int (string)); | |
1245 | } | |
1246 | ||
c5aa993b | 1247 | enum type_pieces |
fba45db2 | 1248 | pop_type (void) |
c906108c SS |
1249 | { |
1250 | if (type_stack_depth) | |
1251 | return type_stack[--type_stack_depth].piece; | |
1252 | return tp_end; | |
1253 | } | |
1254 | ||
1255 | int | |
fba45db2 | 1256 | pop_type_int (void) |
c906108c SS |
1257 | { |
1258 | if (type_stack_depth) | |
1259 | return type_stack[--type_stack_depth].int_val; | |
1260 | /* "Can't happen". */ | |
1261 | return 0; | |
1262 | } | |
1263 | ||
1264 | /* Pop the type stack and return the type which corresponds to FOLLOW_TYPE | |
1265 | as modified by all the stuff on the stack. */ | |
1266 | struct type * | |
fba45db2 | 1267 | follow_types (struct type *follow_type) |
c906108c SS |
1268 | { |
1269 | int done = 0; | |
2e2394a0 MS |
1270 | int make_const = 0; |
1271 | int make_volatile = 0; | |
47663de5 | 1272 | int make_addr_space = 0; |
c906108c SS |
1273 | int array_size; |
1274 | struct type *range_type; | |
1275 | ||
1276 | while (!done) | |
1277 | switch (pop_type ()) | |
1278 | { | |
1279 | case tp_end: | |
1280 | done = 1; | |
2e2394a0 MS |
1281 | if (make_const) |
1282 | follow_type = make_cv_type (make_const, | |
1283 | TYPE_VOLATILE (follow_type), | |
1284 | follow_type, 0); | |
1285 | if (make_volatile) | |
1286 | follow_type = make_cv_type (TYPE_CONST (follow_type), | |
1287 | make_volatile, | |
1288 | follow_type, 0); | |
47663de5 MS |
1289 | if (make_addr_space) |
1290 | follow_type = make_type_with_address_space (follow_type, | |
1291 | make_addr_space); | |
1292 | make_const = make_volatile = 0; | |
1293 | make_addr_space = 0; | |
2e2394a0 MS |
1294 | break; |
1295 | case tp_const: | |
1296 | make_const = 1; | |
1297 | break; | |
1298 | case tp_volatile: | |
1299 | make_volatile = 1; | |
c906108c | 1300 | break; |
47663de5 MS |
1301 | case tp_space_identifier: |
1302 | make_addr_space = pop_type_int (); | |
1303 | break; | |
c906108c SS |
1304 | case tp_pointer: |
1305 | follow_type = lookup_pointer_type (follow_type); | |
2e2394a0 MS |
1306 | if (make_const) |
1307 | follow_type = make_cv_type (make_const, | |
1308 | TYPE_VOLATILE (follow_type), | |
1309 | follow_type, 0); | |
1310 | if (make_volatile) | |
1311 | follow_type = make_cv_type (TYPE_CONST (follow_type), | |
1312 | make_volatile, | |
1313 | follow_type, 0); | |
47663de5 MS |
1314 | if (make_addr_space) |
1315 | follow_type = make_type_with_address_space (follow_type, | |
1316 | make_addr_space); | |
2e2394a0 | 1317 | make_const = make_volatile = 0; |
47663de5 | 1318 | make_addr_space = 0; |
c906108c SS |
1319 | break; |
1320 | case tp_reference: | |
1321 | follow_type = lookup_reference_type (follow_type); | |
2e2394a0 | 1322 | if (make_const) |
47663de5 MS |
1323 | follow_type = make_cv_type (make_const, |
1324 | TYPE_VOLATILE (follow_type), | |
1325 | follow_type, 0); | |
2e2394a0 | 1326 | if (make_volatile) |
47663de5 MS |
1327 | follow_type = make_cv_type (TYPE_CONST (follow_type), |
1328 | make_volatile, | |
1329 | follow_type, 0); | |
1330 | if (make_addr_space) | |
1331 | follow_type = make_type_with_address_space (follow_type, | |
1332 | make_addr_space); | |
2e2394a0 | 1333 | make_const = make_volatile = 0; |
47663de5 | 1334 | make_addr_space = 0; |
c906108c SS |
1335 | break; |
1336 | case tp_array: | |
1337 | array_size = pop_type_int (); | |
1338 | /* FIXME-type-allocation: need a way to free this type when we are | |
1339 | done with it. */ | |
1340 | range_type = | |
1341 | create_range_type ((struct type *) NULL, | |
1342 | builtin_type_int, 0, | |
1343 | array_size >= 0 ? array_size - 1 : 0); | |
1344 | follow_type = | |
1345 | create_array_type ((struct type *) NULL, | |
1346 | follow_type, range_type); | |
1347 | if (array_size < 0) | |
c5aa993b | 1348 | TYPE_ARRAY_UPPER_BOUND_TYPE (follow_type) |
c906108c SS |
1349 | = BOUND_CANNOT_BE_DETERMINED; |
1350 | break; | |
1351 | case tp_function: | |
1352 | /* FIXME-type-allocation: need a way to free this type when we are | |
1353 | done with it. */ | |
1354 | follow_type = lookup_function_type (follow_type); | |
1355 | break; | |
1356 | } | |
1357 | return follow_type; | |
1358 | } | |
1359 | \f | |
a14ed312 | 1360 | static void build_parse (void); |
ac9a91a7 | 1361 | static void |
fba45db2 | 1362 | build_parse (void) |
c906108c | 1363 | { |
cce74817 JM |
1364 | int i; |
1365 | ||
c906108c SS |
1366 | msym_text_symbol_type = |
1367 | init_type (TYPE_CODE_FUNC, 1, 0, "<text variable, no debug info>", NULL); | |
1368 | TYPE_TARGET_TYPE (msym_text_symbol_type) = builtin_type_int; | |
1369 | msym_data_symbol_type = | |
1370 | init_type (TYPE_CODE_INT, TARGET_INT_BIT / HOST_CHAR_BIT, 0, | |
1371 | "<data variable, no debug info>", NULL); | |
1372 | msym_unknown_symbol_type = | |
1373 | init_type (TYPE_CODE_INT, 1, 0, | |
1374 | "<variable (not text or data), no debug info>", | |
1375 | NULL); | |
9e35dae4 DJ |
1376 | |
1377 | msym_tls_symbol_type = | |
1378 | init_type (TYPE_CODE_INT, TARGET_INT_BIT / HOST_CHAR_BIT, 0, | |
1379 | "<thread local variable, no debug info>", NULL); | |
ac9a91a7 JM |
1380 | } |
1381 | ||
f461f5cf PM |
1382 | /* This function avoids direct calls to fprintf |
1383 | in the parser generated debug code. */ | |
1384 | void | |
1385 | parser_fprintf (FILE *x, const char *y, ...) | |
1386 | { | |
1387 | va_list args; | |
1388 | va_start (args, y); | |
1389 | if (x == stderr) | |
1390 | vfprintf_unfiltered (gdb_stderr, y, args); | |
1391 | else | |
1392 | { | |
1393 | fprintf_unfiltered (gdb_stderr, " Unknown FILE used.\n"); | |
1394 | vfprintf_unfiltered (gdb_stderr, y, args); | |
1395 | } | |
1396 | va_end (args); | |
1397 | } | |
1398 | ||
ac9a91a7 | 1399 | void |
fba45db2 | 1400 | _initialize_parse (void) |
ac9a91a7 JM |
1401 | { |
1402 | type_stack_size = 80; | |
1403 | type_stack_depth = 0; | |
1404 | type_stack = (union type_stack_elt *) | |
1405 | xmalloc (type_stack_size * sizeof (*type_stack)); | |
1406 | ||
1407 | build_parse (); | |
c906108c | 1408 | |
0f71a2f6 JM |
1409 | /* FIXME - For the moment, handle types by swapping them in and out. |
1410 | Should be using the per-architecture data-pointer and a large | |
1411 | struct. */ | |
046a4708 AC |
1412 | DEPRECATED_REGISTER_GDBARCH_SWAP (msym_text_symbol_type); |
1413 | DEPRECATED_REGISTER_GDBARCH_SWAP (msym_data_symbol_type); | |
1414 | DEPRECATED_REGISTER_GDBARCH_SWAP (msym_unknown_symbol_type); | |
1415 | deprecated_register_gdbarch_swap (NULL, 0, build_parse); | |
0f71a2f6 | 1416 | |
85c07804 AC |
1417 | add_setshow_zinteger_cmd ("expression", class_maintenance, |
1418 | &expressiondebug, _("\ | |
1419 | Set expression debugging."), _("\ | |
1420 | Show expression debugging."), _("\ | |
1421 | When non-zero, the internal representation of expressions will be printed."), | |
1422 | NULL, | |
920d2a44 | 1423 | show_expressiondebug, |
85c07804 | 1424 | &setdebuglist, &showdebuglist); |
c906108c | 1425 | } |