Commit | Line | Data |
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3d6b6a90 | 1 | /* Parse expressions for GDB. |
ad3b8c4a | 2 | Copyright (C) 1986, 89, 90, 91, 94, 1998 Free Software Foundation, Inc. |
3d6b6a90 JG |
3 | Modified from expread.y by the Department of Computer Science at the |
4 | State University of New York at Buffalo, 1991. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
6c9638b4 | 20 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
3d6b6a90 JG |
21 | |
22 | /* Parse an expression from text in a string, | |
23 | and return the result as a struct expression pointer. | |
24 | That structure contains arithmetic operations in reverse polish, | |
25 | with constants represented by operations that are followed by special data. | |
26 | See expression.h for the details of the format. | |
27 | What is important here is that it can be built up sequentially | |
28 | during the process of parsing; the lower levels of the tree always | |
29 | come first in the result. */ | |
30 | ||
3d6b6a90 | 31 | #include "defs.h" |
2b576293 | 32 | #include "gdb_string.h" |
3d6b6a90 | 33 | #include "symtab.h" |
1ab3bf1b | 34 | #include "gdbtypes.h" |
3d6b6a90 JG |
35 | #include "frame.h" |
36 | #include "expression.h" | |
37 | #include "value.h" | |
38 | #include "command.h" | |
39 | #include "language.h" | |
40 | #include "parser-defs.h" | |
433732f2 | 41 | #include "gdbcmd.h" |
36297ff3 | 42 | #include "symfile.h" /* for overlay functions */ |
79448221 JK |
43 | \f |
44 | /* Global variables declared in parser-defs.h (and commented there). */ | |
45 | struct expression *expout; | |
46 | int expout_size; | |
47 | int expout_ptr; | |
48 | struct block *expression_context_block; | |
49 | struct block *innermost_block; | |
79448221 JK |
50 | int arglist_len; |
51 | union type_stack_elt *type_stack; | |
52 | int type_stack_depth, type_stack_size; | |
53 | char *lexptr; | |
54 | char *namecopy; | |
55 | int paren_depth; | |
56 | int comma_terminates; | |
57 | \f | |
433732f2 SG |
58 | #ifdef MAINTENANCE_CMDS |
59 | static int expressiondebug = 0; | |
60 | #endif | |
61 | ||
9da75ad3 FF |
62 | static void |
63 | free_funcalls PARAMS ((void)); | |
64 | ||
1ab3bf1b JG |
65 | static void |
66 | prefixify_expression PARAMS ((struct expression *)); | |
67 | ||
1ab3bf1b JG |
68 | static void |
69 | prefixify_subexp PARAMS ((struct expression *, struct expression *, int, int)); | |
70 | ||
9da75ad3 FF |
71 | /* Data structure for saving values of arglist_len for function calls whose |
72 | arguments contain other function calls. */ | |
73 | ||
74 | struct funcall | |
75 | { | |
76 | struct funcall *next; | |
77 | int arglist_len; | |
78 | }; | |
79 | ||
80 | static struct funcall *funcall_chain; | |
81 | ||
3d6b6a90 JG |
82 | /* Assign machine-independent names to certain registers |
83 | (unless overridden by the REGISTER_NAMES table) */ | |
84 | ||
a332e593 SC |
85 | #ifdef NO_STD_REGS |
86 | unsigned num_std_regs = 0; | |
87 | struct std_regs std_regs[1]; | |
88 | #else | |
3d6b6a90 | 89 | struct std_regs std_regs[] = { |
a332e593 | 90 | |
3d6b6a90 JG |
91 | #ifdef PC_REGNUM |
92 | { "pc", PC_REGNUM }, | |
93 | #endif | |
94 | #ifdef FP_REGNUM | |
95 | { "fp", FP_REGNUM }, | |
96 | #endif | |
97 | #ifdef SP_REGNUM | |
98 | { "sp", SP_REGNUM }, | |
99 | #endif | |
100 | #ifdef PS_REGNUM | |
101 | { "ps", PS_REGNUM }, | |
102 | #endif | |
a332e593 | 103 | |
3d6b6a90 JG |
104 | }; |
105 | ||
106 | unsigned num_std_regs = (sizeof std_regs / sizeof std_regs[0]); | |
107 | ||
a332e593 SC |
108 | #endif |
109 | ||
d70a61e7 AC |
110 | /* The generic method for targets to specify how their registers are |
111 | named. The mapping can be derived from three sources: | |
112 | REGISTER_NAME; std_regs; or a target specific alias hook. */ | |
678fa7ff RU |
113 | |
114 | int | |
115 | target_map_name_to_register (str, len) | |
116 | char *str; | |
117 | int len; | |
118 | { | |
119 | int i; | |
120 | ||
3b3835cc RU |
121 | /* First try target specific aliases. We try these first because on some |
122 | systems standard names can be context dependent (eg. $pc on a | |
123 | multiprocessor can be could be any of several PCs). */ | |
124 | #ifdef REGISTER_NAME_ALIAS_HOOK | |
125 | i = REGISTER_NAME_ALIAS_HOOK (str, len); | |
126 | if (i >= 0) | |
127 | return i; | |
128 | #endif | |
129 | ||
130 | /* Search architectural register name space. */ | |
678fa7ff | 131 | for (i = 0; i < NUM_REGS; i++) |
9ddf9aa9 AC |
132 | if (REGISTER_NAME (i) && len == strlen (REGISTER_NAME (i)) |
133 | && STREQN (str, REGISTER_NAME (i), len)) | |
678fa7ff RU |
134 | { |
135 | return i; | |
136 | } | |
137 | ||
138 | /* Try standard aliases */ | |
139 | for (i = 0; i < num_std_regs; i++) | |
140 | if (std_regs[i].name && len == strlen (std_regs[i].name) | |
141 | && STREQN (str, std_regs[i].name, len)) | |
142 | { | |
143 | return std_regs[i].regnum; | |
144 | } | |
145 | ||
678fa7ff RU |
146 | return -1; |
147 | } | |
3d6b6a90 JG |
148 | |
149 | /* Begin counting arguments for a function call, | |
150 | saving the data about any containing call. */ | |
151 | ||
152 | void | |
153 | start_arglist () | |
154 | { | |
9da75ad3 | 155 | register struct funcall *new; |
3d6b6a90 | 156 | |
9da75ad3 | 157 | new = (struct funcall *) xmalloc (sizeof (struct funcall)); |
3d6b6a90 JG |
158 | new->next = funcall_chain; |
159 | new->arglist_len = arglist_len; | |
160 | arglist_len = 0; | |
161 | funcall_chain = new; | |
162 | } | |
163 | ||
164 | /* Return the number of arguments in a function call just terminated, | |
165 | and restore the data for the containing function call. */ | |
166 | ||
167 | int | |
168 | end_arglist () | |
169 | { | |
170 | register int val = arglist_len; | |
171 | register struct funcall *call = funcall_chain; | |
172 | funcall_chain = call->next; | |
173 | arglist_len = call->arglist_len; | |
be772100 | 174 | free ((PTR)call); |
3d6b6a90 JG |
175 | return val; |
176 | } | |
177 | ||
178 | /* Free everything in the funcall chain. | |
179 | Used when there is an error inside parsing. */ | |
180 | ||
9da75ad3 | 181 | static void |
3d6b6a90 JG |
182 | free_funcalls () |
183 | { | |
184 | register struct funcall *call, *next; | |
185 | ||
186 | for (call = funcall_chain; call; call = next) | |
187 | { | |
188 | next = call->next; | |
be772100 | 189 | free ((PTR)call); |
3d6b6a90 JG |
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 | |
202 | write_exp_elt (expelt) | |
203 | union exp_element expelt; | |
204 | { | |
205 | if (expout_ptr >= expout_size) | |
206 | { | |
207 | expout_size *= 2; | |
81028ab0 FF |
208 | expout = (struct expression *) |
209 | xrealloc ((char *) expout, sizeof (struct expression) | |
210 | + EXP_ELEM_TO_BYTES (expout_size)); | |
3d6b6a90 JG |
211 | } |
212 | expout->elts[expout_ptr++] = expelt; | |
213 | } | |
214 | ||
215 | void | |
216 | write_exp_elt_opcode (expelt) | |
217 | enum exp_opcode expelt; | |
218 | { | |
219 | union exp_element tmp; | |
220 | ||
221 | tmp.opcode = expelt; | |
222 | ||
223 | write_exp_elt (tmp); | |
224 | } | |
225 | ||
226 | void | |
227 | write_exp_elt_sym (expelt) | |
228 | struct symbol *expelt; | |
229 | { | |
230 | union exp_element tmp; | |
231 | ||
232 | tmp.symbol = expelt; | |
233 | ||
234 | write_exp_elt (tmp); | |
235 | } | |
236 | ||
479fdd26 JK |
237 | void |
238 | write_exp_elt_block (b) | |
239 | struct block *b; | |
240 | { | |
241 | union exp_element tmp; | |
242 | tmp.block = b; | |
243 | write_exp_elt (tmp); | |
244 | } | |
245 | ||
3d6b6a90 JG |
246 | void |
247 | write_exp_elt_longcst (expelt) | |
248 | LONGEST expelt; | |
249 | { | |
250 | union exp_element tmp; | |
251 | ||
252 | tmp.longconst = expelt; | |
253 | ||
254 | write_exp_elt (tmp); | |
255 | } | |
256 | ||
257 | void | |
258 | write_exp_elt_dblcst (expelt) | |
aa220473 | 259 | DOUBLEST expelt; |
3d6b6a90 JG |
260 | { |
261 | union exp_element tmp; | |
262 | ||
263 | tmp.doubleconst = expelt; | |
264 | ||
265 | write_exp_elt (tmp); | |
266 | } | |
267 | ||
268 | void | |
269 | write_exp_elt_type (expelt) | |
270 | struct type *expelt; | |
271 | { | |
272 | union exp_element tmp; | |
273 | ||
274 | tmp.type = expelt; | |
275 | ||
276 | write_exp_elt (tmp); | |
277 | } | |
278 | ||
279 | void | |
280 | write_exp_elt_intern (expelt) | |
281 | struct internalvar *expelt; | |
282 | { | |
283 | union exp_element tmp; | |
284 | ||
285 | tmp.internalvar = expelt; | |
286 | ||
287 | write_exp_elt (tmp); | |
288 | } | |
289 | ||
290 | /* Add a string constant to the end of the expression. | |
d1065385 FF |
291 | |
292 | String constants are stored by first writing an expression element | |
293 | that contains the length of the string, then stuffing the string | |
294 | constant itself into however many expression elements are needed | |
295 | to hold it, and then writing another expression element that contains | |
296 | the length of the string. I.E. an expression element at each end of | |
297 | the string records the string length, so you can skip over the | |
298 | expression elements containing the actual string bytes from either | |
299 | end of the string. Note that this also allows gdb to handle | |
300 | strings with embedded null bytes, as is required for some languages. | |
301 | ||
302 | Don't be fooled by the fact that the string is null byte terminated, | |
303 | this is strictly for the convenience of debugging gdb itself. Gdb | |
304 | Gdb does not depend up the string being null terminated, since the | |
305 | actual length is recorded in expression elements at each end of the | |
306 | string. The null byte is taken into consideration when computing how | |
307 | many expression elements are required to hold the string constant, of | |
308 | course. */ | |
309 | ||
3d6b6a90 JG |
310 | |
311 | void | |
312 | write_exp_string (str) | |
313 | struct stoken str; | |
314 | { | |
315 | register int len = str.length; | |
d1065385 FF |
316 | register int lenelt; |
317 | register char *strdata; | |
3d6b6a90 | 318 | |
d1065385 FF |
319 | /* Compute the number of expression elements required to hold the string |
320 | (including a null byte terminator), along with one expression element | |
321 | at each end to record the actual string length (not including the | |
322 | null byte terminator). */ | |
3d6b6a90 | 323 | |
81028ab0 | 324 | lenelt = 2 + BYTES_TO_EXP_ELEM (len + 1); |
d1065385 FF |
325 | |
326 | /* Ensure that we have enough available expression elements to store | |
327 | everything. */ | |
328 | ||
329 | if ((expout_ptr + lenelt) >= expout_size) | |
3d6b6a90 | 330 | { |
d1065385 | 331 | expout_size = max (expout_size * 2, expout_ptr + lenelt + 10); |
3d6b6a90 | 332 | expout = (struct expression *) |
1ab3bf1b | 333 | xrealloc ((char *) expout, (sizeof (struct expression) |
81028ab0 | 334 | + EXP_ELEM_TO_BYTES (expout_size))); |
3d6b6a90 | 335 | } |
d1065385 FF |
336 | |
337 | /* Write the leading length expression element (which advances the current | |
338 | expression element index), then write the string constant followed by a | |
339 | terminating null byte, and then write the trailing length expression | |
340 | element. */ | |
341 | ||
342 | write_exp_elt_longcst ((LONGEST) len); | |
343 | strdata = (char *) &expout->elts[expout_ptr]; | |
344 | memcpy (strdata, str.ptr, len); | |
345 | *(strdata + len) = '\0'; | |
346 | expout_ptr += lenelt - 2; | |
3d6b6a90 JG |
347 | write_exp_elt_longcst ((LONGEST) len); |
348 | } | |
81028ab0 FF |
349 | |
350 | /* Add a bitstring constant to the end of the expression. | |
351 | ||
352 | Bitstring constants are stored by first writing an expression element | |
353 | that contains the length of the bitstring (in bits), then stuffing the | |
354 | bitstring constant itself into however many expression elements are | |
355 | needed to hold it, and then writing another expression element that | |
356 | contains the length of the bitstring. I.E. an expression element at | |
357 | each end of the bitstring records the bitstring length, so you can skip | |
358 | over the expression elements containing the actual bitstring bytes from | |
359 | either end of the bitstring. */ | |
360 | ||
361 | void | |
362 | write_exp_bitstring (str) | |
363 | struct stoken str; | |
364 | { | |
365 | register int bits = str.length; /* length in bits */ | |
366 | register int len = (bits + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; | |
367 | register int lenelt; | |
368 | register char *strdata; | |
369 | ||
370 | /* Compute the number of expression elements required to hold the bitstring, | |
371 | along with one expression element at each end to record the actual | |
372 | bitstring length in bits. */ | |
373 | ||
374 | lenelt = 2 + BYTES_TO_EXP_ELEM (len); | |
375 | ||
376 | /* Ensure that we have enough available expression elements to store | |
377 | everything. */ | |
378 | ||
379 | if ((expout_ptr + lenelt) >= expout_size) | |
380 | { | |
381 | expout_size = max (expout_size * 2, expout_ptr + lenelt + 10); | |
382 | expout = (struct expression *) | |
383 | xrealloc ((char *) expout, (sizeof (struct expression) | |
384 | + EXP_ELEM_TO_BYTES (expout_size))); | |
385 | } | |
386 | ||
387 | /* Write the leading length expression element (which advances the current | |
388 | expression element index), then write the bitstring constant, and then | |
389 | write the trailing length expression element. */ | |
390 | ||
391 | write_exp_elt_longcst ((LONGEST) bits); | |
392 | strdata = (char *) &expout->elts[expout_ptr]; | |
393 | memcpy (strdata, str.ptr, len); | |
394 | expout_ptr += lenelt - 2; | |
395 | write_exp_elt_longcst ((LONGEST) bits); | |
396 | } | |
abe28b92 JK |
397 | |
398 | /* Add the appropriate elements for a minimal symbol to the end of | |
3fb93d86 JK |
399 | the expression. The rationale behind passing in text_symbol_type and |
400 | data_symbol_type was so that Modula-2 could pass in WORD for | |
401 | data_symbol_type. Perhaps it still is useful to have those types vary | |
402 | based on the language, but they no longer have names like "int", so | |
403 | the initial rationale is gone. */ | |
404 | ||
405 | static struct type *msym_text_symbol_type; | |
406 | static struct type *msym_data_symbol_type; | |
407 | static struct type *msym_unknown_symbol_type; | |
abe28b92 JK |
408 | |
409 | void | |
410 | write_exp_msymbol (msymbol, text_symbol_type, data_symbol_type) | |
411 | struct minimal_symbol *msymbol; | |
412 | struct type *text_symbol_type; | |
413 | struct type *data_symbol_type; | |
414 | { | |
36297ff3 RU |
415 | CORE_ADDR addr; |
416 | ||
abe28b92 | 417 | write_exp_elt_opcode (OP_LONG); |
4461196e | 418 | write_exp_elt_type (lookup_pointer_type (builtin_type_void)); |
36297ff3 RU |
419 | |
420 | addr = SYMBOL_VALUE_ADDRESS (msymbol); | |
421 | if (overlay_debugging) | |
422 | addr = symbol_overlayed_address (addr, SYMBOL_BFD_SECTION (msymbol)); | |
423 | write_exp_elt_longcst ((LONGEST) addr); | |
424 | ||
abe28b92 JK |
425 | write_exp_elt_opcode (OP_LONG); |
426 | ||
427 | write_exp_elt_opcode (UNOP_MEMVAL); | |
428 | switch (msymbol -> type) | |
429 | { | |
430 | case mst_text: | |
431 | case mst_file_text: | |
ae6d035d | 432 | case mst_solib_trampoline: |
3fb93d86 | 433 | write_exp_elt_type (msym_text_symbol_type); |
abe28b92 JK |
434 | break; |
435 | ||
436 | case mst_data: | |
437 | case mst_file_data: | |
438 | case mst_bss: | |
439 | case mst_file_bss: | |
3fb93d86 | 440 | write_exp_elt_type (msym_data_symbol_type); |
abe28b92 JK |
441 | break; |
442 | ||
443 | default: | |
3fb93d86 | 444 | write_exp_elt_type (msym_unknown_symbol_type); |
abe28b92 JK |
445 | break; |
446 | } | |
447 | write_exp_elt_opcode (UNOP_MEMVAL); | |
448 | } | |
3d6b6a90 | 449 | \f |
c700638c PB |
450 | /* Recognize tokens that start with '$'. These include: |
451 | ||
452 | $regname A native register name or a "standard | |
453 | register name". | |
454 | ||
455 | $variable A convenience variable with a name chosen | |
456 | by the user. | |
457 | ||
458 | $digits Value history with index <digits>, starting | |
459 | from the first value which has index 1. | |
460 | ||
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 $$1, etc. | |
465 | ||
466 | $ | $0 | $$0 The last value in the value history. | |
467 | ||
468 | $$ An abbreviation for the second to the last | |
469 | value in the value history, I.E. $$1 | |
470 | ||
471 | */ | |
472 | ||
473 | void | |
474 | write_dollar_variable (str) | |
475 | struct stoken str; | |
476 | { | |
477 | /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1) | |
478 | and $$digits (equivalent to $<-digits> if you could type that). */ | |
479 | ||
480 | int negate = 0; | |
481 | int i = 1; | |
482 | /* Double dollar means negate the number and add -1 as well. | |
483 | Thus $$ alone means -1. */ | |
484 | if (str.length >= 2 && str.ptr[1] == '$') | |
485 | { | |
486 | negate = 1; | |
487 | i = 2; | |
488 | } | |
489 | if (i == str.length) | |
490 | { | |
491 | /* Just dollars (one or two) */ | |
492 | i = - negate; | |
493 | goto handle_last; | |
494 | } | |
495 | /* Is the rest of the token digits? */ | |
496 | for (; i < str.length; i++) | |
497 | if (!(str.ptr[i] >= '0' && str.ptr[i] <= '9')) | |
498 | break; | |
499 | if (i == str.length) | |
500 | { | |
501 | i = atoi (str.ptr + 1 + negate); | |
502 | if (negate) | |
503 | i = - i; | |
504 | goto handle_last; | |
505 | } | |
506 | ||
507 | /* Handle tokens that refer to machine registers: | |
508 | $ followed by a register name. */ | |
678fa7ff RU |
509 | i = target_map_name_to_register( str.ptr + 1, str.length - 1 ); |
510 | if( i >= 0 ) | |
511 | goto handle_register; | |
c700638c PB |
512 | |
513 | /* Any other names starting in $ are debugger internal variables. */ | |
514 | ||
515 | write_exp_elt_opcode (OP_INTERNALVAR); | |
516 | write_exp_elt_intern (lookup_internalvar (copy_name (str) + 1)); | |
517 | write_exp_elt_opcode (OP_INTERNALVAR); | |
518 | return; | |
519 | handle_last: | |
520 | write_exp_elt_opcode (OP_LAST); | |
521 | write_exp_elt_longcst ((LONGEST) i); | |
522 | write_exp_elt_opcode (OP_LAST); | |
523 | return; | |
524 | handle_register: | |
525 | write_exp_elt_opcode (OP_REGISTER); | |
526 | write_exp_elt_longcst (i); | |
527 | write_exp_elt_opcode (OP_REGISTER); | |
528 | return; | |
529 | } | |
530 | \f | |
3d6b6a90 JG |
531 | /* Return a null-terminated temporary copy of the name |
532 | of a string token. */ | |
533 | ||
534 | char * | |
535 | copy_name (token) | |
536 | struct stoken token; | |
537 | { | |
4ed3a9ea | 538 | memcpy (namecopy, token.ptr, token.length); |
3d6b6a90 JG |
539 | namecopy[token.length] = 0; |
540 | return namecopy; | |
541 | } | |
542 | \f | |
543 | /* Reverse an expression from suffix form (in which it is constructed) | |
544 | to prefix form (in which we can conveniently print or execute it). */ | |
545 | ||
1ab3bf1b | 546 | static void |
3d6b6a90 JG |
547 | prefixify_expression (expr) |
548 | register struct expression *expr; | |
549 | { | |
81028ab0 FF |
550 | register int len = |
551 | sizeof (struct expression) + EXP_ELEM_TO_BYTES (expr->nelts); | |
3d6b6a90 JG |
552 | register struct expression *temp; |
553 | register int inpos = expr->nelts, outpos = 0; | |
554 | ||
555 | temp = (struct expression *) alloca (len); | |
556 | ||
557 | /* Copy the original expression into temp. */ | |
4ed3a9ea | 558 | memcpy (temp, expr, len); |
3d6b6a90 JG |
559 | |
560 | prefixify_subexp (temp, expr, inpos, outpos); | |
561 | } | |
562 | ||
563 | /* Return the number of exp_elements in the subexpression of EXPR | |
564 | whose last exp_element is at index ENDPOS - 1 in EXPR. */ | |
565 | ||
8d2755a9 | 566 | int |
3d6b6a90 JG |
567 | length_of_subexp (expr, endpos) |
568 | register struct expression *expr; | |
569 | register int endpos; | |
570 | { | |
571 | register int oplen = 1; | |
572 | register int args = 0; | |
573 | register int i; | |
574 | ||
d1065385 | 575 | if (endpos < 1) |
3d6b6a90 JG |
576 | error ("?error in length_of_subexp"); |
577 | ||
578 | i = (int) expr->elts[endpos - 1].opcode; | |
579 | ||
580 | switch (i) | |
581 | { | |
582 | /* C++ */ | |
583 | case OP_SCOPE: | |
81028ab0 FF |
584 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); |
585 | oplen = 5 + BYTES_TO_EXP_ELEM (oplen + 1); | |
3d6b6a90 JG |
586 | break; |
587 | ||
588 | case OP_LONG: | |
589 | case OP_DOUBLE: | |
479fdd26 | 590 | case OP_VAR_VALUE: |
3d6b6a90 JG |
591 | oplen = 4; |
592 | break; | |
593 | ||
594 | case OP_TYPE: | |
595 | case OP_BOOL: | |
3d6b6a90 JG |
596 | case OP_LAST: |
597 | case OP_REGISTER: | |
598 | case OP_INTERNALVAR: | |
599 | oplen = 3; | |
600 | break; | |
601 | ||
ead95f8a | 602 | case OP_COMPLEX: |
a91a6192 SS |
603 | oplen = 1; |
604 | args = 2; | |
605 | break; | |
606 | ||
3d6b6a90 | 607 | case OP_FUNCALL: |
a91a6192 | 608 | case OP_F77_UNDETERMINED_ARGLIST: |
3d6b6a90 | 609 | oplen = 3; |
d1065385 | 610 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); |
3d6b6a90 JG |
611 | break; |
612 | ||
613 | case UNOP_MAX: | |
614 | case UNOP_MIN: | |
615 | oplen = 3; | |
3d6b6a90 JG |
616 | break; |
617 | ||
618 | case BINOP_VAL: | |
619 | case UNOP_CAST: | |
620 | case UNOP_MEMVAL: | |
621 | oplen = 3; | |
622 | args = 1; | |
623 | break; | |
624 | ||
625 | case UNOP_ABS: | |
626 | case UNOP_CAP: | |
627 | case UNOP_CHR: | |
628 | case UNOP_FLOAT: | |
629 | case UNOP_HIGH: | |
630 | case UNOP_ODD: | |
631 | case UNOP_ORD: | |
632 | case UNOP_TRUNC: | |
633 | oplen = 1; | |
634 | args = 1; | |
635 | break; | |
636 | ||
dcda44a0 | 637 | case OP_LABELED: |
2640f7e1 JG |
638 | case STRUCTOP_STRUCT: |
639 | case STRUCTOP_PTR: | |
640 | args = 1; | |
d1065385 | 641 | /* fall through */ |
3d6b6a90 JG |
642 | case OP_M2_STRING: |
643 | case OP_STRING: | |
3c02944a | 644 | case OP_NAME: |
0e4ca328 | 645 | case OP_EXPRSTRING: |
81028ab0 FF |
646 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); |
647 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1); | |
648 | break; | |
649 | ||
650 | case OP_BITSTRING: | |
651 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); | |
652 | oplen = (oplen + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; | |
653 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen); | |
3d6b6a90 JG |
654 | break; |
655 | ||
c4413e2c FF |
656 | case OP_ARRAY: |
657 | oplen = 4; | |
658 | args = longest_to_int (expr->elts[endpos - 2].longconst); | |
659 | args -= longest_to_int (expr->elts[endpos - 3].longconst); | |
660 | args += 1; | |
661 | break; | |
662 | ||
3d6b6a90 | 663 | case TERNOP_COND: |
f91a9e05 PB |
664 | case TERNOP_SLICE: |
665 | case TERNOP_SLICE_COUNT: | |
3d6b6a90 JG |
666 | args = 3; |
667 | break; | |
668 | ||
669 | /* Modula-2 */ | |
54bbbfb4 | 670 | case MULTI_SUBSCRIPT: |
a91a6192 | 671 | oplen = 3; |
d1065385 | 672 | args = 1 + longest_to_int (expr->elts[endpos- 2].longconst); |
3d6b6a90 JG |
673 | break; |
674 | ||
675 | case BINOP_ASSIGN_MODIFY: | |
676 | oplen = 3; | |
677 | args = 2; | |
678 | break; | |
679 | ||
680 | /* C++ */ | |
681 | case OP_THIS: | |
682 | oplen = 2; | |
683 | break; | |
684 | ||
685 | default: | |
686 | args = 1 + (i < (int) BINOP_END); | |
687 | } | |
688 | ||
689 | while (args > 0) | |
690 | { | |
691 | oplen += length_of_subexp (expr, endpos - oplen); | |
692 | args--; | |
693 | } | |
694 | ||
695 | return oplen; | |
696 | } | |
697 | ||
698 | /* Copy the subexpression ending just before index INEND in INEXPR | |
699 | into OUTEXPR, starting at index OUTBEG. | |
700 | In the process, convert it from suffix to prefix form. */ | |
701 | ||
702 | static void | |
703 | prefixify_subexp (inexpr, outexpr, inend, outbeg) | |
704 | register struct expression *inexpr; | |
705 | struct expression *outexpr; | |
706 | register int inend; | |
707 | int outbeg; | |
708 | { | |
709 | register int oplen = 1; | |
710 | register int args = 0; | |
711 | register int i; | |
712 | int *arglens; | |
713 | enum exp_opcode opcode; | |
714 | ||
715 | /* Compute how long the last operation is (in OPLEN), | |
716 | and also how many preceding subexpressions serve as | |
717 | arguments for it (in ARGS). */ | |
718 | ||
719 | opcode = inexpr->elts[inend - 1].opcode; | |
720 | switch (opcode) | |
721 | { | |
722 | /* C++ */ | |
723 | case OP_SCOPE: | |
81028ab0 FF |
724 | oplen = longest_to_int (inexpr->elts[inend - 2].longconst); |
725 | oplen = 5 + BYTES_TO_EXP_ELEM (oplen + 1); | |
3d6b6a90 JG |
726 | break; |
727 | ||
728 | case OP_LONG: | |
729 | case OP_DOUBLE: | |
479fdd26 | 730 | case OP_VAR_VALUE: |
3d6b6a90 JG |
731 | oplen = 4; |
732 | break; | |
733 | ||
734 | case OP_TYPE: | |
735 | case OP_BOOL: | |
3d6b6a90 JG |
736 | case OP_LAST: |
737 | case OP_REGISTER: | |
738 | case OP_INTERNALVAR: | |
739 | oplen = 3; | |
740 | break; | |
741 | ||
ead95f8a | 742 | case OP_COMPLEX: |
a91a6192 SS |
743 | oplen = 1; |
744 | args = 2; | |
745 | break; | |
746 | ||
3d6b6a90 | 747 | case OP_FUNCALL: |
a91a6192 | 748 | case OP_F77_UNDETERMINED_ARGLIST: |
3d6b6a90 | 749 | oplen = 3; |
d1065385 | 750 | args = 1 + longest_to_int (inexpr->elts[inend - 2].longconst); |
3d6b6a90 JG |
751 | break; |
752 | ||
753 | case UNOP_MIN: | |
754 | case UNOP_MAX: | |
755 | oplen = 3; | |
3d6b6a90 JG |
756 | break; |
757 | ||
758 | case UNOP_CAST: | |
759 | case UNOP_MEMVAL: | |
760 | oplen = 3; | |
761 | args = 1; | |
762 | break; | |
763 | ||
764 | case UNOP_ABS: | |
765 | case UNOP_CAP: | |
766 | case UNOP_CHR: | |
767 | case UNOP_FLOAT: | |
768 | case UNOP_HIGH: | |
769 | case UNOP_ODD: | |
770 | case UNOP_ORD: | |
771 | case UNOP_TRUNC: | |
772 | oplen=1; | |
773 | args=1; | |
774 | break; | |
775 | ||
61c1724b | 776 | case STRUCTOP_STRUCT: |
2640f7e1 | 777 | case STRUCTOP_PTR: |
dcda44a0 | 778 | case OP_LABELED: |
2640f7e1 | 779 | args = 1; |
d1065385 | 780 | /* fall through */ |
3d6b6a90 JG |
781 | case OP_M2_STRING: |
782 | case OP_STRING: | |
3c02944a | 783 | case OP_NAME: |
0e4ca328 | 784 | case OP_EXPRSTRING: |
81028ab0 FF |
785 | oplen = longest_to_int (inexpr->elts[inend - 2].longconst); |
786 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1); | |
787 | break; | |
788 | ||
789 | case OP_BITSTRING: | |
790 | oplen = longest_to_int (inexpr->elts[inend - 2].longconst); | |
791 | oplen = (oplen + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; | |
792 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen); | |
3d6b6a90 JG |
793 | break; |
794 | ||
c4413e2c FF |
795 | case OP_ARRAY: |
796 | oplen = 4; | |
797 | args = longest_to_int (inexpr->elts[inend - 2].longconst); | |
798 | args -= longest_to_int (inexpr->elts[inend - 3].longconst); | |
799 | args += 1; | |
800 | break; | |
801 | ||
3d6b6a90 | 802 | case TERNOP_COND: |
f91a9e05 PB |
803 | case TERNOP_SLICE: |
804 | case TERNOP_SLICE_COUNT: | |
3d6b6a90 JG |
805 | args = 3; |
806 | break; | |
807 | ||
808 | case BINOP_ASSIGN_MODIFY: | |
809 | oplen = 3; | |
810 | args = 2; | |
811 | break; | |
812 | ||
813 | /* Modula-2 */ | |
54bbbfb4 | 814 | case MULTI_SUBSCRIPT: |
a91a6192 | 815 | oplen = 3; |
d1065385 | 816 | args = 1 + longest_to_int (inexpr->elts[inend - 2].longconst); |
3d6b6a90 JG |
817 | break; |
818 | ||
819 | /* C++ */ | |
820 | case OP_THIS: | |
821 | oplen = 2; | |
822 | break; | |
823 | ||
824 | default: | |
825 | args = 1 + ((int) opcode < (int) BINOP_END); | |
826 | } | |
827 | ||
828 | /* Copy the final operator itself, from the end of the input | |
829 | to the beginning of the output. */ | |
830 | inend -= oplen; | |
4ed3a9ea | 831 | memcpy (&outexpr->elts[outbeg], &inexpr->elts[inend], |
81028ab0 | 832 | EXP_ELEM_TO_BYTES (oplen)); |
3d6b6a90 JG |
833 | outbeg += oplen; |
834 | ||
835 | /* Find the lengths of the arg subexpressions. */ | |
836 | arglens = (int *) alloca (args * sizeof (int)); | |
837 | for (i = args - 1; i >= 0; i--) | |
838 | { | |
839 | oplen = length_of_subexp (inexpr, inend); | |
840 | arglens[i] = oplen; | |
841 | inend -= oplen; | |
842 | } | |
843 | ||
844 | /* Now copy each subexpression, preserving the order of | |
845 | the subexpressions, but prefixifying each one. | |
846 | In this loop, inend starts at the beginning of | |
847 | the expression this level is working on | |
848 | and marches forward over the arguments. | |
849 | outbeg does similarly in the output. */ | |
850 | for (i = 0; i < args; i++) | |
851 | { | |
852 | oplen = arglens[i]; | |
853 | inend += oplen; | |
854 | prefixify_subexp (inexpr, outexpr, inend, outbeg); | |
855 | outbeg += oplen; | |
856 | } | |
857 | } | |
858 | \f | |
859 | /* This page contains the two entry points to this file. */ | |
860 | ||
861 | /* Read an expression from the string *STRINGPTR points to, | |
862 | parse it, and return a pointer to a struct expression that we malloc. | |
863 | Use block BLOCK as the lexical context for variable names; | |
864 | if BLOCK is zero, use the block of the selected stack frame. | |
865 | Meanwhile, advance *STRINGPTR to point after the expression, | |
866 | at the first nonwhite character that is not part of the expression | |
867 | (possibly a null character). | |
868 | ||
869 | If COMMA is nonzero, stop if a comma is reached. */ | |
870 | ||
871 | struct expression * | |
872 | parse_exp_1 (stringptr, block, comma) | |
873 | char **stringptr; | |
874 | struct block *block; | |
875 | int comma; | |
876 | { | |
877 | struct cleanup *old_chain; | |
878 | ||
879 | lexptr = *stringptr; | |
880 | ||
881 | paren_depth = 0; | |
882 | type_stack_depth = 0; | |
883 | ||
884 | comma_terminates = comma; | |
885 | ||
886 | if (lexptr == 0 || *lexptr == 0) | |
887 | error_no_arg ("expression to compute"); | |
888 | ||
ad3b8c4a | 889 | old_chain = make_cleanup ((make_cleanup_func) free_funcalls, 0); |
3d6b6a90 JG |
890 | funcall_chain = 0; |
891 | ||
892 | expression_context_block = block ? block : get_selected_block (); | |
893 | ||
894 | namecopy = (char *) alloca (strlen (lexptr) + 1); | |
895 | expout_size = 10; | |
896 | expout_ptr = 0; | |
897 | expout = (struct expression *) | |
81028ab0 | 898 | xmalloc (sizeof (struct expression) + EXP_ELEM_TO_BYTES (expout_size)); |
3d6b6a90 | 899 | expout->language_defn = current_language; |
ad3b8c4a | 900 | make_cleanup ((make_cleanup_func) free_current_contents, &expout); |
3d6b6a90 JG |
901 | |
902 | if (current_language->la_parser ()) | |
903 | current_language->la_error (NULL); | |
904 | ||
905 | discard_cleanups (old_chain); | |
54bbbfb4 FF |
906 | |
907 | /* Record the actual number of expression elements, and then | |
908 | reallocate the expression memory so that we free up any | |
909 | excess elements. */ | |
910 | ||
3d6b6a90 JG |
911 | expout->nelts = expout_ptr; |
912 | expout = (struct expression *) | |
1ab3bf1b | 913 | xrealloc ((char *) expout, |
81028ab0 | 914 | sizeof (struct expression) + EXP_ELEM_TO_BYTES (expout_ptr));; |
54bbbfb4 FF |
915 | |
916 | /* Convert expression from postfix form as generated by yacc | |
917 | parser, to a prefix form. */ | |
918 | ||
433732f2 SG |
919 | #ifdef MAINTENANCE_CMDS |
920 | if (expressiondebug) | |
921 | dump_prefix_expression (expout, gdb_stdout, | |
922 | "before conversion to prefix form"); | |
923 | #endif /* MAINTENANCE_CMDS */ | |
924 | ||
3d6b6a90 | 925 | prefixify_expression (expout); |
433732f2 SG |
926 | |
927 | #ifdef MAINTENANCE_CMDS | |
928 | if (expressiondebug) | |
929 | dump_postfix_expression (expout, gdb_stdout, | |
930 | "after conversion to prefix form"); | |
931 | #endif /* MAINTENANCE_CMDS */ | |
54bbbfb4 | 932 | |
3d6b6a90 JG |
933 | *stringptr = lexptr; |
934 | return expout; | |
935 | } | |
936 | ||
937 | /* Parse STRING as an expression, and complain if this fails | |
938 | to use up all of the contents of STRING. */ | |
939 | ||
940 | struct expression * | |
941 | parse_expression (string) | |
942 | char *string; | |
943 | { | |
944 | register struct expression *exp; | |
945 | exp = parse_exp_1 (&string, 0, 0); | |
946 | if (*string) | |
947 | error ("Junk after end of expression."); | |
948 | return exp; | |
949 | } | |
f843c95f JK |
950 | \f |
951 | /* Stuff for maintaining a stack of types. Currently just used by C, but | |
952 | probably useful for any language which declares its types "backwards". */ | |
3d6b6a90 JG |
953 | |
954 | void | |
955 | push_type (tp) | |
956 | enum type_pieces tp; | |
957 | { | |
958 | if (type_stack_depth == type_stack_size) | |
959 | { | |
960 | type_stack_size *= 2; | |
961 | type_stack = (union type_stack_elt *) | |
1ab3bf1b | 962 | xrealloc ((char *) type_stack, type_stack_size * sizeof (*type_stack)); |
3d6b6a90 JG |
963 | } |
964 | type_stack[type_stack_depth++].piece = tp; | |
965 | } | |
966 | ||
967 | void | |
968 | push_type_int (n) | |
969 | int n; | |
970 | { | |
971 | if (type_stack_depth == type_stack_size) | |
972 | { | |
973 | type_stack_size *= 2; | |
974 | type_stack = (union type_stack_elt *) | |
1ab3bf1b | 975 | xrealloc ((char *) type_stack, type_stack_size * sizeof (*type_stack)); |
3d6b6a90 JG |
976 | } |
977 | type_stack[type_stack_depth++].int_val = n; | |
978 | } | |
979 | ||
980 | enum type_pieces | |
981 | pop_type () | |
982 | { | |
983 | if (type_stack_depth) | |
984 | return type_stack[--type_stack_depth].piece; | |
985 | return tp_end; | |
986 | } | |
987 | ||
988 | int | |
989 | pop_type_int () | |
990 | { | |
991 | if (type_stack_depth) | |
992 | return type_stack[--type_stack_depth].int_val; | |
993 | /* "Can't happen". */ | |
994 | return 0; | |
995 | } | |
996 | ||
f843c95f JK |
997 | /* Pop the type stack and return the type which corresponds to FOLLOW_TYPE |
998 | as modified by all the stuff on the stack. */ | |
999 | struct type * | |
1000 | follow_types (follow_type) | |
1001 | struct type *follow_type; | |
1002 | { | |
1003 | int done = 0; | |
1004 | int array_size; | |
1005 | struct type *range_type; | |
1006 | ||
1007 | while (!done) | |
1008 | switch (pop_type ()) | |
1009 | { | |
1010 | case tp_end: | |
1011 | done = 1; | |
1012 | break; | |
1013 | case tp_pointer: | |
1014 | follow_type = lookup_pointer_type (follow_type); | |
1015 | break; | |
1016 | case tp_reference: | |
1017 | follow_type = lookup_reference_type (follow_type); | |
1018 | break; | |
1019 | case tp_array: | |
1020 | array_size = pop_type_int (); | |
36633dcc JK |
1021 | /* FIXME-type-allocation: need a way to free this type when we are |
1022 | done with it. */ | |
fda36387 PB |
1023 | range_type = |
1024 | create_range_type ((struct type *) NULL, | |
1025 | builtin_type_int, 0, | |
1026 | array_size >= 0 ? array_size - 1 : 0); | |
1027 | follow_type = | |
1028 | create_array_type ((struct type *) NULL, | |
1029 | follow_type, range_type); | |
1030 | if (array_size < 0) | |
1031 | TYPE_ARRAY_UPPER_BOUND_TYPE(follow_type) | |
1032 | = BOUND_CANNOT_BE_DETERMINED; | |
f843c95f JK |
1033 | break; |
1034 | case tp_function: | |
36633dcc JK |
1035 | /* FIXME-type-allocation: need a way to free this type when we are |
1036 | done with it. */ | |
f843c95f JK |
1037 | follow_type = lookup_function_type (follow_type); |
1038 | break; | |
1039 | } | |
1040 | return follow_type; | |
1041 | } | |
1042 | \f | |
3d6b6a90 JG |
1043 | void |
1044 | _initialize_parse () | |
1045 | { | |
1046 | type_stack_size = 80; | |
1047 | type_stack_depth = 0; | |
1048 | type_stack = (union type_stack_elt *) | |
1049 | xmalloc (type_stack_size * sizeof (*type_stack)); | |
3fb93d86 JK |
1050 | |
1051 | msym_text_symbol_type = | |
eedb3363 | 1052 | init_type (TYPE_CODE_FUNC, 1, 0, "<text variable, no debug info>", NULL); |
3fb93d86 JK |
1053 | TYPE_TARGET_TYPE (msym_text_symbol_type) = builtin_type_int; |
1054 | msym_data_symbol_type = | |
1055 | init_type (TYPE_CODE_INT, TARGET_INT_BIT / HOST_CHAR_BIT, 0, | |
eedb3363 | 1056 | "<data variable, no debug info>", NULL); |
3fb93d86 | 1057 | msym_unknown_symbol_type = |
eedb3363 JK |
1058 | init_type (TYPE_CODE_INT, 1, 0, |
1059 | "<variable (not text or data), no debug info>", | |
3fb93d86 | 1060 | NULL); |
433732f2 SG |
1061 | |
1062 | #ifdef MAINTENANCE_CMDS | |
1063 | add_show_from_set ( | |
1064 | add_set_cmd ("expressiondebug", class_maintenance, var_zinteger, | |
1065 | (char *)&expressiondebug, | |
1066 | "Set expression debugging.\n\ | |
1067 | When non-zero, the internal representation of expressions will be printed.", | |
1068 | &setlist), | |
1069 | &showlist); | |
1070 | #endif | |
3d6b6a90 | 1071 | } |