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