| 1 | /* Parse expressions for GDB. |
| 2 | Copyright (C) 1986, 89, 90, 91, 94, 98, 1999 Free Software Foundation, Inc. |
| 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 |
| 20 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 21 | Boston, MA 02111-1307, USA. */ |
| 22 | |
| 23 | /* Parse an expression from text in a string, |
| 24 | and return the result as a struct expression pointer. |
| 25 | That structure contains arithmetic operations in reverse polish, |
| 26 | with constants represented by operations that are followed by special data. |
| 27 | See expression.h for the details of the format. |
| 28 | What is important here is that it can be built up sequentially |
| 29 | during the process of parsing; the lower levels of the tree always |
| 30 | come first in the result. */ |
| 31 | |
| 32 | #include <ctype.h> |
| 33 | |
| 34 | #include "defs.h" |
| 35 | #include "gdb_string.h" |
| 36 | #include "symtab.h" |
| 37 | #include "gdbtypes.h" |
| 38 | #include "frame.h" |
| 39 | #include "expression.h" |
| 40 | #include "value.h" |
| 41 | #include "command.h" |
| 42 | #include "language.h" |
| 43 | #include "parser-defs.h" |
| 44 | #include "gdbcmd.h" |
| 45 | #include "symfile.h" /* for overlay functions */ |
| 46 | \f |
| 47 | /* Symbols which architectures can redefine. */ |
| 48 | |
| 49 | /* Some systems have routines whose names start with `$'. Giving this |
| 50 | macro a non-zero value tells GDB's expression parser to check for |
| 51 | such routines when parsing tokens that begin with `$'. |
| 52 | |
| 53 | On HP-UX, certain system routines (millicode) have names beginning |
| 54 | with `$' or `$$'. For example, `$$dyncall' is a millicode routine |
| 55 | that handles inter-space procedure calls on PA-RISC. */ |
| 56 | #ifndef SYMBOLS_CAN_START_WITH_DOLLAR |
| 57 | #define SYMBOLS_CAN_START_WITH_DOLLAR (0) |
| 58 | #endif |
| 59 | |
| 60 | |
| 61 | \f |
| 62 | /* Global variables declared in parser-defs.h (and commented there). */ |
| 63 | struct expression *expout; |
| 64 | int expout_size; |
| 65 | int expout_ptr; |
| 66 | struct block *expression_context_block; |
| 67 | struct block *innermost_block; |
| 68 | int arglist_len; |
| 69 | union type_stack_elt *type_stack; |
| 70 | int type_stack_depth, type_stack_size; |
| 71 | char *lexptr; |
| 72 | char *namecopy; |
| 73 | int paren_depth; |
| 74 | int comma_terminates; |
| 75 | \f |
| 76 | static int expressiondebug = 0; |
| 77 | |
| 78 | extern int hp_som_som_object_present; |
| 79 | |
| 80 | static void free_funcalls (void *ignore); |
| 81 | |
| 82 | static void prefixify_expression (struct expression *); |
| 83 | |
| 84 | static void |
| 85 | prefixify_subexp (struct expression *, struct expression *, int, int); |
| 86 | |
| 87 | void _initialize_parse (void); |
| 88 | |
| 89 | /* Data structure for saving values of arglist_len for function calls whose |
| 90 | arguments contain other function calls. */ |
| 91 | |
| 92 | struct funcall |
| 93 | { |
| 94 | struct funcall *next; |
| 95 | int arglist_len; |
| 96 | }; |
| 97 | |
| 98 | static struct funcall *funcall_chain; |
| 99 | |
| 100 | /* Assign machine-independent names to certain registers |
| 101 | (unless overridden by the REGISTER_NAMES table) */ |
| 102 | |
| 103 | unsigned num_std_regs = 0; |
| 104 | struct std_regs *std_regs; |
| 105 | |
| 106 | /* The generic method for targets to specify how their registers are |
| 107 | named. The mapping can be derived from three sources: |
| 108 | REGISTER_NAME; std_regs; or a target specific alias hook. */ |
| 109 | |
| 110 | int |
| 111 | target_map_name_to_register (str, len) |
| 112 | char *str; |
| 113 | int len; |
| 114 | { |
| 115 | int i; |
| 116 | |
| 117 | /* First try target specific aliases. We try these first because on some |
| 118 | systems standard names can be context dependent (eg. $pc on a |
| 119 | multiprocessor can be could be any of several PCs). */ |
| 120 | #ifdef REGISTER_NAME_ALIAS_HOOK |
| 121 | i = REGISTER_NAME_ALIAS_HOOK (str, len); |
| 122 | if (i >= 0) |
| 123 | return i; |
| 124 | #endif |
| 125 | |
| 126 | /* Search architectural register name space. */ |
| 127 | for (i = 0; i < NUM_REGS; i++) |
| 128 | if (REGISTER_NAME (i) && len == strlen (REGISTER_NAME (i)) |
| 129 | && STREQN (str, REGISTER_NAME (i), len)) |
| 130 | { |
| 131 | return i; |
| 132 | } |
| 133 | |
| 134 | /* Try standard aliases */ |
| 135 | for (i = 0; i < num_std_regs; i++) |
| 136 | if (std_regs[i].name && len == strlen (std_regs[i].name) |
| 137 | && STREQN (str, std_regs[i].name, len)) |
| 138 | { |
| 139 | return std_regs[i].regnum; |
| 140 | } |
| 141 | |
| 142 | return -1; |
| 143 | } |
| 144 | |
| 145 | /* Begin counting arguments for a function call, |
| 146 | saving the data about any containing call. */ |
| 147 | |
| 148 | void |
| 149 | start_arglist () |
| 150 | { |
| 151 | register struct funcall *new; |
| 152 | |
| 153 | new = (struct funcall *) xmalloc (sizeof (struct funcall)); |
| 154 | new->next = funcall_chain; |
| 155 | new->arglist_len = arglist_len; |
| 156 | arglist_len = 0; |
| 157 | funcall_chain = new; |
| 158 | } |
| 159 | |
| 160 | /* Return the number of arguments in a function call just terminated, |
| 161 | and restore the data for the containing function call. */ |
| 162 | |
| 163 | int |
| 164 | end_arglist () |
| 165 | { |
| 166 | register int val = arglist_len; |
| 167 | register struct funcall *call = funcall_chain; |
| 168 | funcall_chain = call->next; |
| 169 | arglist_len = call->arglist_len; |
| 170 | free ((PTR) call); |
| 171 | return val; |
| 172 | } |
| 173 | |
| 174 | /* Free everything in the funcall chain. |
| 175 | Used when there is an error inside parsing. */ |
| 176 | |
| 177 | static void |
| 178 | free_funcalls (void *ignore) |
| 179 | { |
| 180 | register struct funcall *call, *next; |
| 181 | |
| 182 | for (call = funcall_chain; call; call = next) |
| 183 | { |
| 184 | next = call->next; |
| 185 | free ((PTR) call); |
| 186 | } |
| 187 | } |
| 188 | \f |
| 189 | /* This page contains the functions for adding data to the struct expression |
| 190 | being constructed. */ |
| 191 | |
| 192 | /* Add one element to the end of the expression. */ |
| 193 | |
| 194 | /* To avoid a bug in the Sun 4 compiler, we pass things that can fit into |
| 195 | a register through here */ |
| 196 | |
| 197 | void |
| 198 | write_exp_elt (expelt) |
| 199 | union exp_element expelt; |
| 200 | { |
| 201 | if (expout_ptr >= expout_size) |
| 202 | { |
| 203 | expout_size *= 2; |
| 204 | expout = (struct expression *) |
| 205 | xrealloc ((char *) expout, sizeof (struct expression) |
| 206 | + EXP_ELEM_TO_BYTES (expout_size)); |
| 207 | } |
| 208 | expout->elts[expout_ptr++] = expelt; |
| 209 | } |
| 210 | |
| 211 | void |
| 212 | write_exp_elt_opcode (expelt) |
| 213 | enum exp_opcode expelt; |
| 214 | { |
| 215 | union exp_element tmp; |
| 216 | |
| 217 | tmp.opcode = expelt; |
| 218 | |
| 219 | write_exp_elt (tmp); |
| 220 | } |
| 221 | |
| 222 | void |
| 223 | write_exp_elt_sym (expelt) |
| 224 | struct symbol *expelt; |
| 225 | { |
| 226 | union exp_element tmp; |
| 227 | |
| 228 | tmp.symbol = expelt; |
| 229 | |
| 230 | write_exp_elt (tmp); |
| 231 | } |
| 232 | |
| 233 | void |
| 234 | write_exp_elt_block (b) |
| 235 | struct block *b; |
| 236 | { |
| 237 | union exp_element tmp; |
| 238 | tmp.block = b; |
| 239 | write_exp_elt (tmp); |
| 240 | } |
| 241 | |
| 242 | void |
| 243 | write_exp_elt_longcst (expelt) |
| 244 | LONGEST expelt; |
| 245 | { |
| 246 | union exp_element tmp; |
| 247 | |
| 248 | tmp.longconst = expelt; |
| 249 | |
| 250 | write_exp_elt (tmp); |
| 251 | } |
| 252 | |
| 253 | void |
| 254 | write_exp_elt_dblcst (expelt) |
| 255 | DOUBLEST expelt; |
| 256 | { |
| 257 | union exp_element tmp; |
| 258 | |
| 259 | tmp.doubleconst = expelt; |
| 260 | |
| 261 | write_exp_elt (tmp); |
| 262 | } |
| 263 | |
| 264 | void |
| 265 | write_exp_elt_type (expelt) |
| 266 | struct type *expelt; |
| 267 | { |
| 268 | union exp_element tmp; |
| 269 | |
| 270 | tmp.type = expelt; |
| 271 | |
| 272 | write_exp_elt (tmp); |
| 273 | } |
| 274 | |
| 275 | void |
| 276 | write_exp_elt_intern (expelt) |
| 277 | struct internalvar *expelt; |
| 278 | { |
| 279 | union exp_element tmp; |
| 280 | |
| 281 | tmp.internalvar = expelt; |
| 282 | |
| 283 | write_exp_elt (tmp); |
| 284 | } |
| 285 | |
| 286 | /* Add a string constant to the end of the expression. |
| 287 | |
| 288 | String constants are stored by first writing an expression element |
| 289 | that contains the length of the string, then stuffing the string |
| 290 | constant itself into however many expression elements are needed |
| 291 | to hold it, and then writing another expression element that contains |
| 292 | the length of the string. I.E. an expression element at each end of |
| 293 | the string records the string length, so you can skip over the |
| 294 | expression elements containing the actual string bytes from either |
| 295 | end of the string. Note that this also allows gdb to handle |
| 296 | strings with embedded null bytes, as is required for some languages. |
| 297 | |
| 298 | Don't be fooled by the fact that the string is null byte terminated, |
| 299 | this is strictly for the convenience of debugging gdb itself. Gdb |
| 300 | Gdb does not depend up the string being null terminated, since the |
| 301 | actual length is recorded in expression elements at each end of the |
| 302 | string. The null byte is taken into consideration when computing how |
| 303 | many expression elements are required to hold the string constant, of |
| 304 | course. */ |
| 305 | |
| 306 | |
| 307 | void |
| 308 | write_exp_string (str) |
| 309 | struct stoken str; |
| 310 | { |
| 311 | register int len = str.length; |
| 312 | register int lenelt; |
| 313 | register char *strdata; |
| 314 | |
| 315 | /* Compute the number of expression elements required to hold the string |
| 316 | (including a null byte terminator), along with one expression element |
| 317 | at each end to record the actual string length (not including the |
| 318 | null byte terminator). */ |
| 319 | |
| 320 | lenelt = 2 + BYTES_TO_EXP_ELEM (len + 1); |
| 321 | |
| 322 | /* Ensure that we have enough available expression elements to store |
| 323 | everything. */ |
| 324 | |
| 325 | if ((expout_ptr + lenelt) >= expout_size) |
| 326 | { |
| 327 | expout_size = max (expout_size * 2, expout_ptr + lenelt + 10); |
| 328 | expout = (struct expression *) |
| 329 | xrealloc ((char *) expout, (sizeof (struct expression) |
| 330 | + EXP_ELEM_TO_BYTES (expout_size))); |
| 331 | } |
| 332 | |
| 333 | /* Write the leading length expression element (which advances the current |
| 334 | expression element index), then write the string constant followed by a |
| 335 | terminating null byte, and then write the trailing length expression |
| 336 | element. */ |
| 337 | |
| 338 | write_exp_elt_longcst ((LONGEST) len); |
| 339 | strdata = (char *) &expout->elts[expout_ptr]; |
| 340 | memcpy (strdata, str.ptr, len); |
| 341 | *(strdata + len) = '\0'; |
| 342 | expout_ptr += lenelt - 2; |
| 343 | write_exp_elt_longcst ((LONGEST) len); |
| 344 | } |
| 345 | |
| 346 | /* Add a bitstring constant to the end of the expression. |
| 347 | |
| 348 | Bitstring constants are stored by first writing an expression element |
| 349 | that contains the length of the bitstring (in bits), then stuffing the |
| 350 | bitstring constant itself into however many expression elements are |
| 351 | needed to hold it, and then writing another expression element that |
| 352 | contains the length of the bitstring. I.E. an expression element at |
| 353 | each end of the bitstring records the bitstring length, so you can skip |
| 354 | over the expression elements containing the actual bitstring bytes from |
| 355 | either end of the bitstring. */ |
| 356 | |
| 357 | void |
| 358 | write_exp_bitstring (str) |
| 359 | struct stoken str; |
| 360 | { |
| 361 | register int bits = str.length; /* length in bits */ |
| 362 | register int len = (bits + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; |
| 363 | register int lenelt; |
| 364 | register char *strdata; |
| 365 | |
| 366 | /* Compute the number of expression elements required to hold the bitstring, |
| 367 | along with one expression element at each end to record the actual |
| 368 | bitstring length in bits. */ |
| 369 | |
| 370 | lenelt = 2 + BYTES_TO_EXP_ELEM (len); |
| 371 | |
| 372 | /* Ensure that we have enough available expression elements to store |
| 373 | everything. */ |
| 374 | |
| 375 | if ((expout_ptr + lenelt) >= expout_size) |
| 376 | { |
| 377 | expout_size = max (expout_size * 2, expout_ptr + lenelt + 10); |
| 378 | expout = (struct expression *) |
| 379 | xrealloc ((char *) expout, (sizeof (struct expression) |
| 380 | + EXP_ELEM_TO_BYTES (expout_size))); |
| 381 | } |
| 382 | |
| 383 | /* Write the leading length expression element (which advances the current |
| 384 | expression element index), then write the bitstring constant, and then |
| 385 | write the trailing length expression element. */ |
| 386 | |
| 387 | write_exp_elt_longcst ((LONGEST) bits); |
| 388 | strdata = (char *) &expout->elts[expout_ptr]; |
| 389 | memcpy (strdata, str.ptr, len); |
| 390 | expout_ptr += lenelt - 2; |
| 391 | write_exp_elt_longcst ((LONGEST) bits); |
| 392 | } |
| 393 | |
| 394 | /* Add the appropriate elements for a minimal symbol to the end of |
| 395 | the expression. The rationale behind passing in text_symbol_type and |
| 396 | data_symbol_type was so that Modula-2 could pass in WORD for |
| 397 | data_symbol_type. Perhaps it still is useful to have those types vary |
| 398 | based on the language, but they no longer have names like "int", so |
| 399 | the initial rationale is gone. */ |
| 400 | |
| 401 | static struct type *msym_text_symbol_type; |
| 402 | static struct type *msym_data_symbol_type; |
| 403 | static struct type *msym_unknown_symbol_type; |
| 404 | |
| 405 | void |
| 406 | write_exp_msymbol (msymbol, text_symbol_type, data_symbol_type) |
| 407 | struct minimal_symbol *msymbol; |
| 408 | struct type *text_symbol_type; |
| 409 | struct type *data_symbol_type; |
| 410 | { |
| 411 | CORE_ADDR addr; |
| 412 | |
| 413 | write_exp_elt_opcode (OP_LONG); |
| 414 | write_exp_elt_type (lookup_pointer_type (builtin_type_void)); |
| 415 | |
| 416 | addr = SYMBOL_VALUE_ADDRESS (msymbol); |
| 417 | if (overlay_debugging) |
| 418 | addr = symbol_overlayed_address (addr, SYMBOL_BFD_SECTION (msymbol)); |
| 419 | write_exp_elt_longcst ((LONGEST) addr); |
| 420 | |
| 421 | write_exp_elt_opcode (OP_LONG); |
| 422 | |
| 423 | write_exp_elt_opcode (UNOP_MEMVAL); |
| 424 | switch (msymbol->type) |
| 425 | { |
| 426 | case mst_text: |
| 427 | case mst_file_text: |
| 428 | case mst_solib_trampoline: |
| 429 | write_exp_elt_type (msym_text_symbol_type); |
| 430 | break; |
| 431 | |
| 432 | case mst_data: |
| 433 | case mst_file_data: |
| 434 | case mst_bss: |
| 435 | case mst_file_bss: |
| 436 | write_exp_elt_type (msym_data_symbol_type); |
| 437 | break; |
| 438 | |
| 439 | default: |
| 440 | write_exp_elt_type (msym_unknown_symbol_type); |
| 441 | break; |
| 442 | } |
| 443 | write_exp_elt_opcode (UNOP_MEMVAL); |
| 444 | } |
| 445 | \f |
| 446 | /* Recognize tokens that start with '$'. These include: |
| 447 | |
| 448 | $regname A native register name or a "standard |
| 449 | register name". |
| 450 | |
| 451 | $variable A convenience variable with a name chosen |
| 452 | by the user. |
| 453 | |
| 454 | $digits Value history with index <digits>, starting |
| 455 | from the first value which has index 1. |
| 456 | |
| 457 | $$digits Value history with index <digits> relative |
| 458 | to the last value. I.E. $$0 is the last |
| 459 | value, $$1 is the one previous to that, $$2 |
| 460 | is the one previous to $$1, etc. |
| 461 | |
| 462 | $ | $0 | $$0 The last value in the value history. |
| 463 | |
| 464 | $$ An abbreviation for the second to the last |
| 465 | value in the value history, I.E. $$1 |
| 466 | |
| 467 | */ |
| 468 | |
| 469 | void |
| 470 | write_dollar_variable (str) |
| 471 | struct stoken str; |
| 472 | { |
| 473 | /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1) |
| 474 | and $$digits (equivalent to $<-digits> if you could type that). */ |
| 475 | |
| 476 | int negate = 0; |
| 477 | int i = 1; |
| 478 | /* Double dollar means negate the number and add -1 as well. |
| 479 | Thus $$ alone means -1. */ |
| 480 | if (str.length >= 2 && str.ptr[1] == '$') |
| 481 | { |
| 482 | negate = 1; |
| 483 | i = 2; |
| 484 | } |
| 485 | if (i == str.length) |
| 486 | { |
| 487 | /* Just dollars (one or two) */ |
| 488 | i = -negate; |
| 489 | goto handle_last; |
| 490 | } |
| 491 | /* Is the rest of the token digits? */ |
| 492 | for (; i < str.length; i++) |
| 493 | if (!(str.ptr[i] >= '0' && str.ptr[i] <= '9')) |
| 494 | break; |
| 495 | if (i == str.length) |
| 496 | { |
| 497 | i = atoi (str.ptr + 1 + negate); |
| 498 | if (negate) |
| 499 | i = -i; |
| 500 | goto handle_last; |
| 501 | } |
| 502 | |
| 503 | /* Handle tokens that refer to machine registers: |
| 504 | $ followed by a register name. */ |
| 505 | i = target_map_name_to_register (str.ptr + 1, str.length - 1); |
| 506 | if (i >= 0) |
| 507 | goto handle_register; |
| 508 | |
| 509 | if (SYMBOLS_CAN_START_WITH_DOLLAR) |
| 510 | { |
| 511 | struct symbol *sym = NULL; |
| 512 | struct minimal_symbol *msym = NULL; |
| 513 | |
| 514 | /* On HP-UX, certain system routines (millicode) have names beginning |
| 515 | with $ or $$, e.g. $$dyncall, which handles inter-space procedure |
| 516 | calls on PA-RISC. Check for those, first. */ |
| 517 | |
| 518 | /* This code is not enabled on non HP-UX systems, since worst case |
| 519 | symbol table lookup performance is awful, to put it mildly. */ |
| 520 | |
| 521 | sym = lookup_symbol (copy_name (str), (struct block *) NULL, |
| 522 | VAR_NAMESPACE, (int *) NULL, (struct symtab **) NULL); |
| 523 | if (sym) |
| 524 | { |
| 525 | write_exp_elt_opcode (OP_VAR_VALUE); |
| 526 | write_exp_elt_block (block_found); /* set by lookup_symbol */ |
| 527 | write_exp_elt_sym (sym); |
| 528 | write_exp_elt_opcode (OP_VAR_VALUE); |
| 529 | return; |
| 530 | } |
| 531 | msym = lookup_minimal_symbol (copy_name (str), NULL, NULL); |
| 532 | if (msym) |
| 533 | { |
| 534 | write_exp_msymbol (msym, |
| 535 | lookup_function_type (builtin_type_int), |
| 536 | builtin_type_int); |
| 537 | return; |
| 538 | } |
| 539 | } |
| 540 | |
| 541 | /* Any other names starting in $ are debugger internal variables. */ |
| 542 | |
| 543 | write_exp_elt_opcode (OP_INTERNALVAR); |
| 544 | write_exp_elt_intern (lookup_internalvar (copy_name (str) + 1)); |
| 545 | write_exp_elt_opcode (OP_INTERNALVAR); |
| 546 | return; |
| 547 | handle_last: |
| 548 | write_exp_elt_opcode (OP_LAST); |
| 549 | write_exp_elt_longcst ((LONGEST) i); |
| 550 | write_exp_elt_opcode (OP_LAST); |
| 551 | return; |
| 552 | handle_register: |
| 553 | write_exp_elt_opcode (OP_REGISTER); |
| 554 | write_exp_elt_longcst (i); |
| 555 | write_exp_elt_opcode (OP_REGISTER); |
| 556 | return; |
| 557 | } |
| 558 | |
| 559 | |
| 560 | /* Parse a string that is possibly a namespace / nested class |
| 561 | specification, i.e., something of the form A::B::C::x. Input |
| 562 | (NAME) is the entire string; LEN is the current valid length; the |
| 563 | output is a string, TOKEN, which points to the largest recognized |
| 564 | prefix which is a series of namespaces or classes. CLASS_PREFIX is |
| 565 | another output, which records whether a nested class spec was |
| 566 | recognized (= 1) or a fully qualified variable name was found (= |
| 567 | 0). ARGPTR is side-effected (if non-NULL) to point to beyond the |
| 568 | string recognized and consumed by this routine. |
| 569 | |
| 570 | The return value is a pointer to the symbol for the base class or |
| 571 | variable if found, or NULL if not found. Callers must check this |
| 572 | first -- if NULL, the outputs may not be correct. |
| 573 | |
| 574 | This function is used c-exp.y. This is used specifically to get |
| 575 | around HP aCC (and possibly other compilers), which insists on |
| 576 | generating names with embedded colons for namespace or nested class |
| 577 | members. |
| 578 | |
| 579 | (Argument LEN is currently unused. 1997-08-27) |
| 580 | |
| 581 | Callers must free memory allocated for the output string TOKEN. */ |
| 582 | |
| 583 | static const char coloncolon[2] = |
| 584 | {':', ':'}; |
| 585 | |
| 586 | struct symbol * |
| 587 | parse_nested_classes_for_hpacc (name, len, token, class_prefix, argptr) |
| 588 | char *name; |
| 589 | int len; |
| 590 | char **token; |
| 591 | int *class_prefix; |
| 592 | char **argptr; |
| 593 | { |
| 594 | /* Comment below comes from decode_line_1 which has very similar |
| 595 | code, which is called for "break" command parsing. */ |
| 596 | |
| 597 | /* We have what looks like a class or namespace |
| 598 | scope specification (A::B), possibly with many |
| 599 | levels of namespaces or classes (A::B::C::D). |
| 600 | |
| 601 | Some versions of the HP ANSI C++ compiler (as also possibly |
| 602 | other compilers) generate class/function/member names with |
| 603 | embedded double-colons if they are inside namespaces. To |
| 604 | handle this, we loop a few times, considering larger and |
| 605 | larger prefixes of the string as though they were single |
| 606 | symbols. So, if the initially supplied string is |
| 607 | A::B::C::D::foo, we have to look up "A", then "A::B", |
| 608 | then "A::B::C", then "A::B::C::D", and finally |
| 609 | "A::B::C::D::foo" as single, monolithic symbols, because |
| 610 | A, B, C or D may be namespaces. |
| 611 | |
| 612 | Note that namespaces can nest only inside other |
| 613 | namespaces, and not inside classes. So we need only |
| 614 | consider *prefixes* of the string; there is no need to look up |
| 615 | "B::C" separately as a symbol in the previous example. */ |
| 616 | |
| 617 | register char *p; |
| 618 | char *start, *end; |
| 619 | char *prefix = NULL; |
| 620 | char *tmp; |
| 621 | struct symbol *sym_class = NULL; |
| 622 | struct symbol *sym_var = NULL; |
| 623 | struct type *t; |
| 624 | int prefix_len = 0; |
| 625 | int done = 0; |
| 626 | char *q; |
| 627 | |
| 628 | /* Check for HP-compiled executable -- in other cases |
| 629 | return NULL, and caller must default to standard GDB |
| 630 | behaviour. */ |
| 631 | |
| 632 | if (!hp_som_som_object_present) |
| 633 | return (struct symbol *) NULL; |
| 634 | |
| 635 | p = name; |
| 636 | |
| 637 | /* Skip over whitespace and possible global "::" */ |
| 638 | while (*p && (*p == ' ' || *p == '\t')) |
| 639 | p++; |
| 640 | if (p[0] == ':' && p[1] == ':') |
| 641 | p += 2; |
| 642 | while (*p && (*p == ' ' || *p == '\t')) |
| 643 | p++; |
| 644 | |
| 645 | while (1) |
| 646 | { |
| 647 | /* Get to the end of the next namespace or class spec. */ |
| 648 | /* If we're looking at some non-token, fail immediately */ |
| 649 | start = p; |
| 650 | if (!(isalpha (*p) || *p == '$' || *p == '_')) |
| 651 | return (struct symbol *) NULL; |
| 652 | p++; |
| 653 | while (*p && (isalnum (*p) || *p == '$' || *p == '_')) |
| 654 | p++; |
| 655 | |
| 656 | if (*p == '<') |
| 657 | { |
| 658 | /* If we have the start of a template specification, |
| 659 | scan right ahead to its end */ |
| 660 | q = find_template_name_end (p); |
| 661 | if (q) |
| 662 | p = q; |
| 663 | } |
| 664 | |
| 665 | end = p; |
| 666 | |
| 667 | /* Skip over "::" and whitespace for next time around */ |
| 668 | while (*p && (*p == ' ' || *p == '\t')) |
| 669 | p++; |
| 670 | if (p[0] == ':' && p[1] == ':') |
| 671 | p += 2; |
| 672 | while (*p && (*p == ' ' || *p == '\t')) |
| 673 | p++; |
| 674 | |
| 675 | /* Done with tokens? */ |
| 676 | if (!*p || !(isalpha (*p) || *p == '$' || *p == '_')) |
| 677 | done = 1; |
| 678 | |
| 679 | tmp = (char *) alloca (prefix_len + end - start + 3); |
| 680 | if (prefix) |
| 681 | { |
| 682 | memcpy (tmp, prefix, prefix_len); |
| 683 | memcpy (tmp + prefix_len, coloncolon, 2); |
| 684 | memcpy (tmp + prefix_len + 2, start, end - start); |
| 685 | tmp[prefix_len + 2 + end - start] = '\000'; |
| 686 | } |
| 687 | else |
| 688 | { |
| 689 | memcpy (tmp, start, end - start); |
| 690 | tmp[end - start] = '\000'; |
| 691 | } |
| 692 | |
| 693 | prefix = tmp; |
| 694 | prefix_len = strlen (prefix); |
| 695 | |
| 696 | /* See if the prefix we have now is something we know about */ |
| 697 | |
| 698 | if (!done) |
| 699 | { |
| 700 | /* More tokens to process, so this must be a class/namespace */ |
| 701 | sym_class = lookup_symbol (prefix, 0, STRUCT_NAMESPACE, |
| 702 | 0, (struct symtab **) NULL); |
| 703 | } |
| 704 | else |
| 705 | { |
| 706 | /* No more tokens, so try as a variable first */ |
| 707 | sym_var = lookup_symbol (prefix, 0, VAR_NAMESPACE, |
| 708 | 0, (struct symtab **) NULL); |
| 709 | /* If failed, try as class/namespace */ |
| 710 | if (!sym_var) |
| 711 | sym_class = lookup_symbol (prefix, 0, STRUCT_NAMESPACE, |
| 712 | 0, (struct symtab **) NULL); |
| 713 | } |
| 714 | |
| 715 | if (sym_var || |
| 716 | (sym_class && |
| 717 | (t = check_typedef (SYMBOL_TYPE (sym_class)), |
| 718 | (TYPE_CODE (t) == TYPE_CODE_STRUCT |
| 719 | || TYPE_CODE (t) == TYPE_CODE_UNION)))) |
| 720 | { |
| 721 | /* We found a valid token */ |
| 722 | *token = (char *) xmalloc (prefix_len + 1); |
| 723 | memcpy (*token, prefix, prefix_len); |
| 724 | (*token)[prefix_len] = '\000'; |
| 725 | break; |
| 726 | } |
| 727 | |
| 728 | /* No variable or class/namespace found, no more tokens */ |
| 729 | if (done) |
| 730 | return (struct symbol *) NULL; |
| 731 | } |
| 732 | |
| 733 | /* Out of loop, so we must have found a valid token */ |
| 734 | if (sym_var) |
| 735 | *class_prefix = 0; |
| 736 | else |
| 737 | *class_prefix = 1; |
| 738 | |
| 739 | if (argptr) |
| 740 | *argptr = done ? p : end; |
| 741 | |
| 742 | return sym_var ? sym_var : sym_class; /* found */ |
| 743 | } |
| 744 | |
| 745 | char * |
| 746 | find_template_name_end (p) |
| 747 | char *p; |
| 748 | { |
| 749 | int depth = 1; |
| 750 | int just_seen_right = 0; |
| 751 | int just_seen_colon = 0; |
| 752 | int just_seen_space = 0; |
| 753 | |
| 754 | if (!p || (*p != '<')) |
| 755 | return 0; |
| 756 | |
| 757 | while (*++p) |
| 758 | { |
| 759 | switch (*p) |
| 760 | { |
| 761 | case '\'': |
| 762 | case '\"': |
| 763 | case '{': |
| 764 | case '}': |
| 765 | /* In future, may want to allow these?? */ |
| 766 | return 0; |
| 767 | case '<': |
| 768 | depth++; /* start nested template */ |
| 769 | if (just_seen_colon || just_seen_right || just_seen_space) |
| 770 | return 0; /* but not after : or :: or > or space */ |
| 771 | break; |
| 772 | case '>': |
| 773 | if (just_seen_colon || just_seen_right) |
| 774 | return 0; /* end a (nested?) template */ |
| 775 | just_seen_right = 1; /* but not after : or :: */ |
| 776 | if (--depth == 0) /* also disallow >>, insist on > > */ |
| 777 | return ++p; /* if outermost ended, return */ |
| 778 | break; |
| 779 | case ':': |
| 780 | if (just_seen_space || (just_seen_colon > 1)) |
| 781 | return 0; /* nested class spec coming up */ |
| 782 | just_seen_colon++; /* we allow :: but not :::: */ |
| 783 | break; |
| 784 | case ' ': |
| 785 | break; |
| 786 | default: |
| 787 | if (!((*p >= 'a' && *p <= 'z') || /* allow token chars */ |
| 788 | (*p >= 'A' && *p <= 'Z') || |
| 789 | (*p >= '0' && *p <= '9') || |
| 790 | (*p == '_') || (*p == ',') || /* commas for template args */ |
| 791 | (*p == '&') || (*p == '*') || /* pointer and ref types */ |
| 792 | (*p == '(') || (*p == ')') || /* function types */ |
| 793 | (*p == '[') || (*p == ']'))) /* array types */ |
| 794 | return 0; |
| 795 | } |
| 796 | if (*p != ' ') |
| 797 | just_seen_space = 0; |
| 798 | if (*p != ':') |
| 799 | just_seen_colon = 0; |
| 800 | if (*p != '>') |
| 801 | just_seen_right = 0; |
| 802 | } |
| 803 | return 0; |
| 804 | } |
| 805 | \f |
| 806 | |
| 807 | |
| 808 | /* Return a null-terminated temporary copy of the name |
| 809 | of a string token. */ |
| 810 | |
| 811 | char * |
| 812 | copy_name (token) |
| 813 | struct stoken token; |
| 814 | { |
| 815 | memcpy (namecopy, token.ptr, token.length); |
| 816 | namecopy[token.length] = 0; |
| 817 | return namecopy; |
| 818 | } |
| 819 | \f |
| 820 | /* Reverse an expression from suffix form (in which it is constructed) |
| 821 | to prefix form (in which we can conveniently print or execute it). */ |
| 822 | |
| 823 | static void |
| 824 | prefixify_expression (expr) |
| 825 | register struct expression *expr; |
| 826 | { |
| 827 | register int len = |
| 828 | sizeof (struct expression) + EXP_ELEM_TO_BYTES (expr->nelts); |
| 829 | register struct expression *temp; |
| 830 | register int inpos = expr->nelts, outpos = 0; |
| 831 | |
| 832 | temp = (struct expression *) alloca (len); |
| 833 | |
| 834 | /* Copy the original expression into temp. */ |
| 835 | memcpy (temp, expr, len); |
| 836 | |
| 837 | prefixify_subexp (temp, expr, inpos, outpos); |
| 838 | } |
| 839 | |
| 840 | /* Return the number of exp_elements in the subexpression of EXPR |
| 841 | whose last exp_element is at index ENDPOS - 1 in EXPR. */ |
| 842 | |
| 843 | int |
| 844 | length_of_subexp (expr, endpos) |
| 845 | register struct expression *expr; |
| 846 | register int endpos; |
| 847 | { |
| 848 | register int oplen = 1; |
| 849 | register int args = 0; |
| 850 | register int i; |
| 851 | |
| 852 | if (endpos < 1) |
| 853 | error ("?error in length_of_subexp"); |
| 854 | |
| 855 | i = (int) expr->elts[endpos - 1].opcode; |
| 856 | |
| 857 | switch (i) |
| 858 | { |
| 859 | /* C++ */ |
| 860 | case OP_SCOPE: |
| 861 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); |
| 862 | oplen = 5 + BYTES_TO_EXP_ELEM (oplen + 1); |
| 863 | break; |
| 864 | |
| 865 | case OP_LONG: |
| 866 | case OP_DOUBLE: |
| 867 | case OP_VAR_VALUE: |
| 868 | oplen = 4; |
| 869 | break; |
| 870 | |
| 871 | case OP_TYPE: |
| 872 | case OP_BOOL: |
| 873 | case OP_LAST: |
| 874 | case OP_REGISTER: |
| 875 | case OP_INTERNALVAR: |
| 876 | oplen = 3; |
| 877 | break; |
| 878 | |
| 879 | case OP_COMPLEX: |
| 880 | oplen = 1; |
| 881 | args = 2; |
| 882 | break; |
| 883 | |
| 884 | case OP_FUNCALL: |
| 885 | case OP_F77_UNDETERMINED_ARGLIST: |
| 886 | oplen = 3; |
| 887 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); |
| 888 | break; |
| 889 | |
| 890 | case UNOP_MAX: |
| 891 | case UNOP_MIN: |
| 892 | oplen = 3; |
| 893 | break; |
| 894 | |
| 895 | case BINOP_VAL: |
| 896 | case UNOP_CAST: |
| 897 | case UNOP_MEMVAL: |
| 898 | oplen = 3; |
| 899 | args = 1; |
| 900 | break; |
| 901 | |
| 902 | case UNOP_ABS: |
| 903 | case UNOP_CAP: |
| 904 | case UNOP_CHR: |
| 905 | case UNOP_FLOAT: |
| 906 | case UNOP_HIGH: |
| 907 | case UNOP_ODD: |
| 908 | case UNOP_ORD: |
| 909 | case UNOP_TRUNC: |
| 910 | oplen = 1; |
| 911 | args = 1; |
| 912 | break; |
| 913 | |
| 914 | case OP_LABELED: |
| 915 | case STRUCTOP_STRUCT: |
| 916 | case STRUCTOP_PTR: |
| 917 | args = 1; |
| 918 | /* fall through */ |
| 919 | case OP_M2_STRING: |
| 920 | case OP_STRING: |
| 921 | case OP_NAME: |
| 922 | case OP_EXPRSTRING: |
| 923 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); |
| 924 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1); |
| 925 | break; |
| 926 | |
| 927 | case OP_BITSTRING: |
| 928 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); |
| 929 | oplen = (oplen + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; |
| 930 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen); |
| 931 | break; |
| 932 | |
| 933 | case OP_ARRAY: |
| 934 | oplen = 4; |
| 935 | args = longest_to_int (expr->elts[endpos - 2].longconst); |
| 936 | args -= longest_to_int (expr->elts[endpos - 3].longconst); |
| 937 | args += 1; |
| 938 | break; |
| 939 | |
| 940 | case TERNOP_COND: |
| 941 | case TERNOP_SLICE: |
| 942 | case TERNOP_SLICE_COUNT: |
| 943 | args = 3; |
| 944 | break; |
| 945 | |
| 946 | /* Modula-2 */ |
| 947 | case MULTI_SUBSCRIPT: |
| 948 | oplen = 3; |
| 949 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); |
| 950 | break; |
| 951 | |
| 952 | case BINOP_ASSIGN_MODIFY: |
| 953 | oplen = 3; |
| 954 | args = 2; |
| 955 | break; |
| 956 | |
| 957 | /* C++ */ |
| 958 | case OP_THIS: |
| 959 | oplen = 2; |
| 960 | break; |
| 961 | |
| 962 | default: |
| 963 | args = 1 + (i < (int) BINOP_END); |
| 964 | } |
| 965 | |
| 966 | while (args > 0) |
| 967 | { |
| 968 | oplen += length_of_subexp (expr, endpos - oplen); |
| 969 | args--; |
| 970 | } |
| 971 | |
| 972 | return oplen; |
| 973 | } |
| 974 | |
| 975 | /* Copy the subexpression ending just before index INEND in INEXPR |
| 976 | into OUTEXPR, starting at index OUTBEG. |
| 977 | In the process, convert it from suffix to prefix form. */ |
| 978 | |
| 979 | static void |
| 980 | prefixify_subexp (inexpr, outexpr, inend, outbeg) |
| 981 | register struct expression *inexpr; |
| 982 | struct expression *outexpr; |
| 983 | register int inend; |
| 984 | int outbeg; |
| 985 | { |
| 986 | register int oplen = 1; |
| 987 | register int args = 0; |
| 988 | register int i; |
| 989 | int *arglens; |
| 990 | enum exp_opcode opcode; |
| 991 | |
| 992 | /* Compute how long the last operation is (in OPLEN), |
| 993 | and also how many preceding subexpressions serve as |
| 994 | arguments for it (in ARGS). */ |
| 995 | |
| 996 | opcode = inexpr->elts[inend - 1].opcode; |
| 997 | switch (opcode) |
| 998 | { |
| 999 | /* C++ */ |
| 1000 | case OP_SCOPE: |
| 1001 | oplen = longest_to_int (inexpr->elts[inend - 2].longconst); |
| 1002 | oplen = 5 + BYTES_TO_EXP_ELEM (oplen + 1); |
| 1003 | break; |
| 1004 | |
| 1005 | case OP_LONG: |
| 1006 | case OP_DOUBLE: |
| 1007 | case OP_VAR_VALUE: |
| 1008 | oplen = 4; |
| 1009 | break; |
| 1010 | |
| 1011 | case OP_TYPE: |
| 1012 | case OP_BOOL: |
| 1013 | case OP_LAST: |
| 1014 | case OP_REGISTER: |
| 1015 | case OP_INTERNALVAR: |
| 1016 | oplen = 3; |
| 1017 | break; |
| 1018 | |
| 1019 | case OP_COMPLEX: |
| 1020 | oplen = 1; |
| 1021 | args = 2; |
| 1022 | break; |
| 1023 | |
| 1024 | case OP_FUNCALL: |
| 1025 | case OP_F77_UNDETERMINED_ARGLIST: |
| 1026 | oplen = 3; |
| 1027 | args = 1 + longest_to_int (inexpr->elts[inend - 2].longconst); |
| 1028 | break; |
| 1029 | |
| 1030 | case UNOP_MIN: |
| 1031 | case UNOP_MAX: |
| 1032 | oplen = 3; |
| 1033 | break; |
| 1034 | |
| 1035 | case UNOP_CAST: |
| 1036 | case UNOP_MEMVAL: |
| 1037 | oplen = 3; |
| 1038 | args = 1; |
| 1039 | break; |
| 1040 | |
| 1041 | case UNOP_ABS: |
| 1042 | case UNOP_CAP: |
| 1043 | case UNOP_CHR: |
| 1044 | case UNOP_FLOAT: |
| 1045 | case UNOP_HIGH: |
| 1046 | case UNOP_ODD: |
| 1047 | case UNOP_ORD: |
| 1048 | case UNOP_TRUNC: |
| 1049 | oplen = 1; |
| 1050 | args = 1; |
| 1051 | break; |
| 1052 | |
| 1053 | case STRUCTOP_STRUCT: |
| 1054 | case STRUCTOP_PTR: |
| 1055 | case OP_LABELED: |
| 1056 | args = 1; |
| 1057 | /* fall through */ |
| 1058 | case OP_M2_STRING: |
| 1059 | case OP_STRING: |
| 1060 | case OP_NAME: |
| 1061 | case OP_EXPRSTRING: |
| 1062 | oplen = longest_to_int (inexpr->elts[inend - 2].longconst); |
| 1063 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1); |
| 1064 | break; |
| 1065 | |
| 1066 | case OP_BITSTRING: |
| 1067 | oplen = longest_to_int (inexpr->elts[inend - 2].longconst); |
| 1068 | oplen = (oplen + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; |
| 1069 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen); |
| 1070 | break; |
| 1071 | |
| 1072 | case OP_ARRAY: |
| 1073 | oplen = 4; |
| 1074 | args = longest_to_int (inexpr->elts[inend - 2].longconst); |
| 1075 | args -= longest_to_int (inexpr->elts[inend - 3].longconst); |
| 1076 | args += 1; |
| 1077 | break; |
| 1078 | |
| 1079 | case TERNOP_COND: |
| 1080 | case TERNOP_SLICE: |
| 1081 | case TERNOP_SLICE_COUNT: |
| 1082 | args = 3; |
| 1083 | break; |
| 1084 | |
| 1085 | case BINOP_ASSIGN_MODIFY: |
| 1086 | oplen = 3; |
| 1087 | args = 2; |
| 1088 | break; |
| 1089 | |
| 1090 | /* Modula-2 */ |
| 1091 | case MULTI_SUBSCRIPT: |
| 1092 | oplen = 3; |
| 1093 | args = 1 + longest_to_int (inexpr->elts[inend - 2].longconst); |
| 1094 | break; |
| 1095 | |
| 1096 | /* C++ */ |
| 1097 | case OP_THIS: |
| 1098 | oplen = 2; |
| 1099 | break; |
| 1100 | |
| 1101 | default: |
| 1102 | args = 1 + ((int) opcode < (int) BINOP_END); |
| 1103 | } |
| 1104 | |
| 1105 | /* Copy the final operator itself, from the end of the input |
| 1106 | to the beginning of the output. */ |
| 1107 | inend -= oplen; |
| 1108 | memcpy (&outexpr->elts[outbeg], &inexpr->elts[inend], |
| 1109 | EXP_ELEM_TO_BYTES (oplen)); |
| 1110 | outbeg += oplen; |
| 1111 | |
| 1112 | /* Find the lengths of the arg subexpressions. */ |
| 1113 | arglens = (int *) alloca (args * sizeof (int)); |
| 1114 | for (i = args - 1; i >= 0; i--) |
| 1115 | { |
| 1116 | oplen = length_of_subexp (inexpr, inend); |
| 1117 | arglens[i] = oplen; |
| 1118 | inend -= oplen; |
| 1119 | } |
| 1120 | |
| 1121 | /* Now copy each subexpression, preserving the order of |
| 1122 | the subexpressions, but prefixifying each one. |
| 1123 | In this loop, inend starts at the beginning of |
| 1124 | the expression this level is working on |
| 1125 | and marches forward over the arguments. |
| 1126 | outbeg does similarly in the output. */ |
| 1127 | for (i = 0; i < args; i++) |
| 1128 | { |
| 1129 | oplen = arglens[i]; |
| 1130 | inend += oplen; |
| 1131 | prefixify_subexp (inexpr, outexpr, inend, outbeg); |
| 1132 | outbeg += oplen; |
| 1133 | } |
| 1134 | } |
| 1135 | \f |
| 1136 | /* This page contains the two entry points to this file. */ |
| 1137 | |
| 1138 | /* Read an expression from the string *STRINGPTR points to, |
| 1139 | parse it, and return a pointer to a struct expression that we malloc. |
| 1140 | Use block BLOCK as the lexical context for variable names; |
| 1141 | if BLOCK is zero, use the block of the selected stack frame. |
| 1142 | Meanwhile, advance *STRINGPTR to point after the expression, |
| 1143 | at the first nonwhite character that is not part of the expression |
| 1144 | (possibly a null character). |
| 1145 | |
| 1146 | If COMMA is nonzero, stop if a comma is reached. */ |
| 1147 | |
| 1148 | struct expression * |
| 1149 | parse_exp_1 (stringptr, block, comma) |
| 1150 | char **stringptr; |
| 1151 | struct block *block; |
| 1152 | int comma; |
| 1153 | { |
| 1154 | struct cleanup *old_chain; |
| 1155 | |
| 1156 | lexptr = *stringptr; |
| 1157 | |
| 1158 | paren_depth = 0; |
| 1159 | type_stack_depth = 0; |
| 1160 | |
| 1161 | comma_terminates = comma; |
| 1162 | |
| 1163 | if (lexptr == 0 || *lexptr == 0) |
| 1164 | error_no_arg ("expression to compute"); |
| 1165 | |
| 1166 | old_chain = make_cleanup (free_funcalls, 0 /*ignore*/); |
| 1167 | funcall_chain = 0; |
| 1168 | |
| 1169 | expression_context_block = block ? block : get_selected_block (); |
| 1170 | |
| 1171 | namecopy = (char *) alloca (strlen (lexptr) + 1); |
| 1172 | expout_size = 10; |
| 1173 | expout_ptr = 0; |
| 1174 | expout = (struct expression *) |
| 1175 | xmalloc (sizeof (struct expression) + EXP_ELEM_TO_BYTES (expout_size)); |
| 1176 | expout->language_defn = current_language; |
| 1177 | make_cleanup (free_current_contents, &expout); |
| 1178 | |
| 1179 | if (current_language->la_parser ()) |
| 1180 | current_language->la_error (NULL); |
| 1181 | |
| 1182 | discard_cleanups (old_chain); |
| 1183 | |
| 1184 | /* Record the actual number of expression elements, and then |
| 1185 | reallocate the expression memory so that we free up any |
| 1186 | excess elements. */ |
| 1187 | |
| 1188 | expout->nelts = expout_ptr; |
| 1189 | expout = (struct expression *) |
| 1190 | xrealloc ((char *) expout, |
| 1191 | sizeof (struct expression) + EXP_ELEM_TO_BYTES (expout_ptr));; |
| 1192 | |
| 1193 | /* Convert expression from postfix form as generated by yacc |
| 1194 | parser, to a prefix form. */ |
| 1195 | |
| 1196 | if (expressiondebug) |
| 1197 | dump_prefix_expression (expout, gdb_stdlog, |
| 1198 | "before conversion to prefix form"); |
| 1199 | |
| 1200 | prefixify_expression (expout); |
| 1201 | |
| 1202 | if (expressiondebug) |
| 1203 | dump_postfix_expression (expout, gdb_stdlog, |
| 1204 | "after conversion to prefix form"); |
| 1205 | |
| 1206 | *stringptr = lexptr; |
| 1207 | return expout; |
| 1208 | } |
| 1209 | |
| 1210 | /* Parse STRING as an expression, and complain if this fails |
| 1211 | to use up all of the contents of STRING. */ |
| 1212 | |
| 1213 | struct expression * |
| 1214 | parse_expression (string) |
| 1215 | char *string; |
| 1216 | { |
| 1217 | register struct expression *exp; |
| 1218 | exp = parse_exp_1 (&string, 0, 0); |
| 1219 | if (*string) |
| 1220 | error ("Junk after end of expression."); |
| 1221 | return exp; |
| 1222 | } |
| 1223 | \f |
| 1224 | /* Stuff for maintaining a stack of types. Currently just used by C, but |
| 1225 | probably useful for any language which declares its types "backwards". */ |
| 1226 | |
| 1227 | void |
| 1228 | push_type (tp) |
| 1229 | enum type_pieces tp; |
| 1230 | { |
| 1231 | if (type_stack_depth == type_stack_size) |
| 1232 | { |
| 1233 | type_stack_size *= 2; |
| 1234 | type_stack = (union type_stack_elt *) |
| 1235 | xrealloc ((char *) type_stack, type_stack_size * sizeof (*type_stack)); |
| 1236 | } |
| 1237 | type_stack[type_stack_depth++].piece = tp; |
| 1238 | } |
| 1239 | |
| 1240 | void |
| 1241 | push_type_int (n) |
| 1242 | int n; |
| 1243 | { |
| 1244 | if (type_stack_depth == type_stack_size) |
| 1245 | { |
| 1246 | type_stack_size *= 2; |
| 1247 | type_stack = (union type_stack_elt *) |
| 1248 | xrealloc ((char *) type_stack, type_stack_size * sizeof (*type_stack)); |
| 1249 | } |
| 1250 | type_stack[type_stack_depth++].int_val = n; |
| 1251 | } |
| 1252 | |
| 1253 | enum type_pieces |
| 1254 | pop_type () |
| 1255 | { |
| 1256 | if (type_stack_depth) |
| 1257 | return type_stack[--type_stack_depth].piece; |
| 1258 | return tp_end; |
| 1259 | } |
| 1260 | |
| 1261 | int |
| 1262 | pop_type_int () |
| 1263 | { |
| 1264 | if (type_stack_depth) |
| 1265 | return type_stack[--type_stack_depth].int_val; |
| 1266 | /* "Can't happen". */ |
| 1267 | return 0; |
| 1268 | } |
| 1269 | |
| 1270 | /* Pop the type stack and return the type which corresponds to FOLLOW_TYPE |
| 1271 | as modified by all the stuff on the stack. */ |
| 1272 | struct type * |
| 1273 | follow_types (follow_type) |
| 1274 | struct type *follow_type; |
| 1275 | { |
| 1276 | int done = 0; |
| 1277 | int array_size; |
| 1278 | struct type *range_type; |
| 1279 | |
| 1280 | while (!done) |
| 1281 | switch (pop_type ()) |
| 1282 | { |
| 1283 | case tp_end: |
| 1284 | done = 1; |
| 1285 | break; |
| 1286 | case tp_pointer: |
| 1287 | follow_type = lookup_pointer_type (follow_type); |
| 1288 | break; |
| 1289 | case tp_reference: |
| 1290 | follow_type = lookup_reference_type (follow_type); |
| 1291 | break; |
| 1292 | case tp_array: |
| 1293 | array_size = pop_type_int (); |
| 1294 | /* FIXME-type-allocation: need a way to free this type when we are |
| 1295 | done with it. */ |
| 1296 | range_type = |
| 1297 | create_range_type ((struct type *) NULL, |
| 1298 | builtin_type_int, 0, |
| 1299 | array_size >= 0 ? array_size - 1 : 0); |
| 1300 | follow_type = |
| 1301 | create_array_type ((struct type *) NULL, |
| 1302 | follow_type, range_type); |
| 1303 | if (array_size < 0) |
| 1304 | TYPE_ARRAY_UPPER_BOUND_TYPE (follow_type) |
| 1305 | = BOUND_CANNOT_BE_DETERMINED; |
| 1306 | break; |
| 1307 | case tp_function: |
| 1308 | /* FIXME-type-allocation: need a way to free this type when we are |
| 1309 | done with it. */ |
| 1310 | follow_type = lookup_function_type (follow_type); |
| 1311 | break; |
| 1312 | } |
| 1313 | return follow_type; |
| 1314 | } |
| 1315 | \f |
| 1316 | static void build_parse (void); |
| 1317 | static void |
| 1318 | build_parse () |
| 1319 | { |
| 1320 | int i; |
| 1321 | |
| 1322 | msym_text_symbol_type = |
| 1323 | init_type (TYPE_CODE_FUNC, 1, 0, "<text variable, no debug info>", NULL); |
| 1324 | TYPE_TARGET_TYPE (msym_text_symbol_type) = builtin_type_int; |
| 1325 | msym_data_symbol_type = |
| 1326 | init_type (TYPE_CODE_INT, TARGET_INT_BIT / HOST_CHAR_BIT, 0, |
| 1327 | "<data variable, no debug info>", NULL); |
| 1328 | msym_unknown_symbol_type = |
| 1329 | init_type (TYPE_CODE_INT, 1, 0, |
| 1330 | "<variable (not text or data), no debug info>", |
| 1331 | NULL); |
| 1332 | |
| 1333 | /* create the std_regs table */ |
| 1334 | |
| 1335 | num_std_regs = 0; |
| 1336 | #ifdef PC_REGNUM |
| 1337 | if (PC_REGNUM >= 0) |
| 1338 | num_std_regs++; |
| 1339 | #endif |
| 1340 | #ifdef FP_REGNUM |
| 1341 | if (FP_REGNUM >= 0) |
| 1342 | num_std_regs++; |
| 1343 | #endif |
| 1344 | #ifdef SP_REGNUM |
| 1345 | if (SP_REGNUM >= 0) |
| 1346 | num_std_regs++; |
| 1347 | #endif |
| 1348 | #ifdef PS_REGNUM |
| 1349 | if (PS_REGNUM >= 0) |
| 1350 | num_std_regs++; |
| 1351 | #endif |
| 1352 | /* create an empty table */ |
| 1353 | std_regs = xmalloc ((num_std_regs + 1) * sizeof *std_regs); |
| 1354 | i = 0; |
| 1355 | /* fill it in */ |
| 1356 | #ifdef PC_REGNUM |
| 1357 | std_regs[i].name = "pc"; |
| 1358 | std_regs[i].regnum = PC_REGNUM; |
| 1359 | i++; |
| 1360 | #endif |
| 1361 | #ifdef FP_REGNUM |
| 1362 | std_regs[i].name = "fp"; |
| 1363 | std_regs[i].regnum = FP_REGNUM; |
| 1364 | i++; |
| 1365 | #endif |
| 1366 | #ifdef SP_REGNUM |
| 1367 | std_regs[i].name = "sp"; |
| 1368 | std_regs[i].regnum = SP_REGNUM; |
| 1369 | i++; |
| 1370 | #endif |
| 1371 | #ifdef PS_REGNUM |
| 1372 | std_regs[i].name = "ps"; |
| 1373 | std_regs[i].regnum = PS_REGNUM; |
| 1374 | i++; |
| 1375 | #endif |
| 1376 | memset (&std_regs[i], 0, sizeof (std_regs[i])); |
| 1377 | } |
| 1378 | |
| 1379 | void |
| 1380 | _initialize_parse () |
| 1381 | { |
| 1382 | type_stack_size = 80; |
| 1383 | type_stack_depth = 0; |
| 1384 | type_stack = (union type_stack_elt *) |
| 1385 | xmalloc (type_stack_size * sizeof (*type_stack)); |
| 1386 | |
| 1387 | build_parse (); |
| 1388 | |
| 1389 | /* FIXME - For the moment, handle types by swapping them in and out. |
| 1390 | Should be using the per-architecture data-pointer and a large |
| 1391 | struct. */ |
| 1392 | register_gdbarch_swap (&msym_text_symbol_type, sizeof (msym_text_symbol_type), NULL); |
| 1393 | register_gdbarch_swap (&msym_data_symbol_type, sizeof (msym_data_symbol_type), NULL); |
| 1394 | register_gdbarch_swap (&msym_unknown_symbol_type, sizeof (msym_unknown_symbol_type), NULL); |
| 1395 | |
| 1396 | register_gdbarch_swap (&num_std_regs, sizeof (std_regs), NULL); |
| 1397 | register_gdbarch_swap (&std_regs, sizeof (std_regs), NULL); |
| 1398 | register_gdbarch_swap (NULL, 0, build_parse); |
| 1399 | |
| 1400 | add_show_from_set ( |
| 1401 | add_set_cmd ("expression", class_maintenance, var_zinteger, |
| 1402 | (char *) &expressiondebug, |
| 1403 | "Set expression debugging.\n\ |
| 1404 | When non-zero, the internal representation of expressions will be printed.", |
| 1405 | &setdebuglist), |
| 1406 | &showdebuglist); |
| 1407 | } |