| 1 | /* Parse expressions for GDB. |
| 2 | |
| 3 | Copyright (C) 1986-2018 Free Software Foundation, Inc. |
| 4 | |
| 5 | Modified from expread.y by the Department of Computer Science at the |
| 6 | State University of New York at Buffalo, 1991. |
| 7 | |
| 8 | This file is part of GDB. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 3 of the License, or |
| 13 | (at your option) any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 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 "defs.h" |
| 33 | #include <ctype.h> |
| 34 | #include "arch-utils.h" |
| 35 | #include "symtab.h" |
| 36 | #include "gdbtypes.h" |
| 37 | #include "frame.h" |
| 38 | #include "expression.h" |
| 39 | #include "value.h" |
| 40 | #include "command.h" |
| 41 | #include "language.h" |
| 42 | #include "f-lang.h" |
| 43 | #include "parser-defs.h" |
| 44 | #include "gdbcmd.h" |
| 45 | #include "symfile.h" /* for overlay functions */ |
| 46 | #include "inferior.h" |
| 47 | #include "target-float.h" |
| 48 | #include "block.h" |
| 49 | #include "source.h" |
| 50 | #include "objfiles.h" |
| 51 | #include "user-regs.h" |
| 52 | #include <algorithm> |
| 53 | #include "common/gdb_optional.h" |
| 54 | |
| 55 | /* Standard set of definitions for printing, dumping, prefixifying, |
| 56 | * and evaluating expressions. */ |
| 57 | |
| 58 | const struct exp_descriptor exp_descriptor_standard = |
| 59 | { |
| 60 | print_subexp_standard, |
| 61 | operator_length_standard, |
| 62 | operator_check_standard, |
| 63 | op_name_standard, |
| 64 | dump_subexp_body_standard, |
| 65 | evaluate_subexp_standard |
| 66 | }; |
| 67 | \f |
| 68 | /* Global variables declared in parser-defs.h (and commented there). */ |
| 69 | const struct block *expression_context_block; |
| 70 | CORE_ADDR expression_context_pc; |
| 71 | innermost_block_tracker innermost_block; |
| 72 | int arglist_len; |
| 73 | static struct type_stack type_stack; |
| 74 | const char *lexptr; |
| 75 | const char *prev_lexptr; |
| 76 | int paren_depth; |
| 77 | int comma_terminates; |
| 78 | |
| 79 | /* True if parsing an expression to attempt completion. */ |
| 80 | int parse_completion; |
| 81 | |
| 82 | /* The index of the last struct expression directly before a '.' or |
| 83 | '->'. This is set when parsing and is only used when completing a |
| 84 | field name. It is -1 if no dereference operation was found. */ |
| 85 | static int expout_last_struct = -1; |
| 86 | |
| 87 | /* If we are completing a tagged type name, this will be nonzero. */ |
| 88 | static enum type_code expout_tag_completion_type = TYPE_CODE_UNDEF; |
| 89 | |
| 90 | /* The token for tagged type name completion. */ |
| 91 | static gdb::unique_xmalloc_ptr<char> expout_completion_name; |
| 92 | |
| 93 | \f |
| 94 | static unsigned 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 | |
| 103 | /* Non-zero if an expression parser should set yydebug. */ |
| 104 | int parser_debug; |
| 105 | |
| 106 | static void |
| 107 | show_parserdebug (struct ui_file *file, int from_tty, |
| 108 | struct cmd_list_element *c, const char *value) |
| 109 | { |
| 110 | fprintf_filtered (file, _("Parser debugging is %s.\n"), value); |
| 111 | } |
| 112 | |
| 113 | |
| 114 | static int prefixify_subexp (struct expression *, struct expression *, int, |
| 115 | int); |
| 116 | |
| 117 | static expression_up parse_exp_in_context (const char **, CORE_ADDR, |
| 118 | const struct block *, int, |
| 119 | int, int *); |
| 120 | static expression_up parse_exp_in_context_1 (const char **, CORE_ADDR, |
| 121 | const struct block *, int, |
| 122 | int, int *); |
| 123 | |
| 124 | /* Documented at it's declaration. */ |
| 125 | |
| 126 | void |
| 127 | innermost_block_tracker::update (const struct block *b, |
| 128 | innermost_block_tracker_types t) |
| 129 | { |
| 130 | if ((m_types & t) != 0 |
| 131 | && (m_innermost_block == NULL |
| 132 | || contained_in (b, m_innermost_block))) |
| 133 | m_innermost_block = b; |
| 134 | } |
| 135 | |
| 136 | /* Data structure for saving values of arglist_len for function calls whose |
| 137 | arguments contain other function calls. */ |
| 138 | |
| 139 | static std::vector<int> *funcall_chain; |
| 140 | |
| 141 | /* Begin counting arguments for a function call, |
| 142 | saving the data about any containing call. */ |
| 143 | |
| 144 | void |
| 145 | start_arglist (void) |
| 146 | { |
| 147 | funcall_chain->push_back (arglist_len); |
| 148 | arglist_len = 0; |
| 149 | } |
| 150 | |
| 151 | /* Return the number of arguments in a function call just terminated, |
| 152 | and restore the data for the containing function call. */ |
| 153 | |
| 154 | int |
| 155 | end_arglist (void) |
| 156 | { |
| 157 | int val = arglist_len; |
| 158 | arglist_len = funcall_chain->back (); |
| 159 | funcall_chain->pop_back (); |
| 160 | return val; |
| 161 | } |
| 162 | |
| 163 | \f |
| 164 | |
| 165 | /* See definition in parser-defs.h. */ |
| 166 | |
| 167 | parser_state::parser_state (size_t initial_size, |
| 168 | const struct language_defn *lang, |
| 169 | struct gdbarch *gdbarch) |
| 170 | : expout_size (initial_size), |
| 171 | expout (XNEWVAR (expression, |
| 172 | (sizeof (expression) |
| 173 | + EXP_ELEM_TO_BYTES (expout_size)))), |
| 174 | expout_ptr (0) |
| 175 | { |
| 176 | expout->language_defn = lang; |
| 177 | expout->gdbarch = gdbarch; |
| 178 | } |
| 179 | |
| 180 | expression_up |
| 181 | parser_state::release () |
| 182 | { |
| 183 | /* Record the actual number of expression elements, and then |
| 184 | reallocate the expression memory so that we free up any |
| 185 | excess elements. */ |
| 186 | |
| 187 | expout->nelts = expout_ptr; |
| 188 | expout.reset (XRESIZEVAR (expression, expout.release (), |
| 189 | (sizeof (expression) |
| 190 | + EXP_ELEM_TO_BYTES (expout_ptr)))); |
| 191 | |
| 192 | return std::move (expout); |
| 193 | } |
| 194 | |
| 195 | /* This page contains the functions for adding data to the struct expression |
| 196 | being constructed. */ |
| 197 | |
| 198 | /* Add one element to the end of the expression. */ |
| 199 | |
| 200 | /* To avoid a bug in the Sun 4 compiler, we pass things that can fit into |
| 201 | a register through here. */ |
| 202 | |
| 203 | static void |
| 204 | write_exp_elt (struct parser_state *ps, const union exp_element *expelt) |
| 205 | { |
| 206 | if (ps->expout_ptr >= ps->expout_size) |
| 207 | { |
| 208 | ps->expout_size *= 2; |
| 209 | ps->expout.reset (XRESIZEVAR (expression, ps->expout.release (), |
| 210 | (sizeof (expression) |
| 211 | + EXP_ELEM_TO_BYTES (ps->expout_size)))); |
| 212 | } |
| 213 | ps->expout->elts[ps->expout_ptr++] = *expelt; |
| 214 | } |
| 215 | |
| 216 | void |
| 217 | write_exp_elt_opcode (struct parser_state *ps, enum exp_opcode expelt) |
| 218 | { |
| 219 | union exp_element tmp; |
| 220 | |
| 221 | memset (&tmp, 0, sizeof (union exp_element)); |
| 222 | tmp.opcode = expelt; |
| 223 | write_exp_elt (ps, &tmp); |
| 224 | } |
| 225 | |
| 226 | void |
| 227 | write_exp_elt_sym (struct parser_state *ps, struct symbol *expelt) |
| 228 | { |
| 229 | union exp_element tmp; |
| 230 | |
| 231 | memset (&tmp, 0, sizeof (union exp_element)); |
| 232 | tmp.symbol = expelt; |
| 233 | write_exp_elt (ps, &tmp); |
| 234 | } |
| 235 | |
| 236 | void |
| 237 | write_exp_elt_msym (struct parser_state *ps, minimal_symbol *expelt) |
| 238 | { |
| 239 | union exp_element tmp; |
| 240 | |
| 241 | memset (&tmp, 0, sizeof (union exp_element)); |
| 242 | tmp.msymbol = expelt; |
| 243 | write_exp_elt (ps, &tmp); |
| 244 | } |
| 245 | |
| 246 | void |
| 247 | write_exp_elt_block (struct parser_state *ps, const struct block *b) |
| 248 | { |
| 249 | union exp_element tmp; |
| 250 | |
| 251 | memset (&tmp, 0, sizeof (union exp_element)); |
| 252 | tmp.block = b; |
| 253 | write_exp_elt (ps, &tmp); |
| 254 | } |
| 255 | |
| 256 | void |
| 257 | write_exp_elt_objfile (struct parser_state *ps, struct objfile *objfile) |
| 258 | { |
| 259 | union exp_element tmp; |
| 260 | |
| 261 | memset (&tmp, 0, sizeof (union exp_element)); |
| 262 | tmp.objfile = objfile; |
| 263 | write_exp_elt (ps, &tmp); |
| 264 | } |
| 265 | |
| 266 | void |
| 267 | write_exp_elt_longcst (struct parser_state *ps, LONGEST expelt) |
| 268 | { |
| 269 | union exp_element tmp; |
| 270 | |
| 271 | memset (&tmp, 0, sizeof (union exp_element)); |
| 272 | tmp.longconst = expelt; |
| 273 | write_exp_elt (ps, &tmp); |
| 274 | } |
| 275 | |
| 276 | void |
| 277 | write_exp_elt_floatcst (struct parser_state *ps, const gdb_byte expelt[16]) |
| 278 | { |
| 279 | union exp_element tmp; |
| 280 | int index; |
| 281 | |
| 282 | for (index = 0; index < 16; index++) |
| 283 | tmp.floatconst[index] = expelt[index]; |
| 284 | |
| 285 | write_exp_elt (ps, &tmp); |
| 286 | } |
| 287 | |
| 288 | void |
| 289 | write_exp_elt_type (struct parser_state *ps, struct type *expelt) |
| 290 | { |
| 291 | union exp_element tmp; |
| 292 | |
| 293 | memset (&tmp, 0, sizeof (union exp_element)); |
| 294 | tmp.type = expelt; |
| 295 | write_exp_elt (ps, &tmp); |
| 296 | } |
| 297 | |
| 298 | void |
| 299 | write_exp_elt_intern (struct parser_state *ps, struct internalvar *expelt) |
| 300 | { |
| 301 | union exp_element tmp; |
| 302 | |
| 303 | memset (&tmp, 0, sizeof (union exp_element)); |
| 304 | tmp.internalvar = expelt; |
| 305 | write_exp_elt (ps, &tmp); |
| 306 | } |
| 307 | |
| 308 | /* Add a string constant to the end of the expression. |
| 309 | |
| 310 | String constants are stored by first writing an expression element |
| 311 | that contains the length of the string, then stuffing the string |
| 312 | constant itself into however many expression elements are needed |
| 313 | to hold it, and then writing another expression element that contains |
| 314 | the length of the string. I.e. an expression element at each end of |
| 315 | the string records the string length, so you can skip over the |
| 316 | expression elements containing the actual string bytes from either |
| 317 | end of the string. Note that this also allows gdb to handle |
| 318 | strings with embedded null bytes, as is required for some languages. |
| 319 | |
| 320 | Don't be fooled by the fact that the string is null byte terminated, |
| 321 | this is strictly for the convenience of debugging gdb itself. |
| 322 | Gdb does not depend up the string being null terminated, since the |
| 323 | actual length is recorded in expression elements at each end of the |
| 324 | string. The null byte is taken into consideration when computing how |
| 325 | many expression elements are required to hold the string constant, of |
| 326 | course. */ |
| 327 | |
| 328 | |
| 329 | void |
| 330 | write_exp_string (struct parser_state *ps, struct stoken str) |
| 331 | { |
| 332 | int len = str.length; |
| 333 | size_t lenelt; |
| 334 | char *strdata; |
| 335 | |
| 336 | /* Compute the number of expression elements required to hold the string |
| 337 | (including a null byte terminator), along with one expression element |
| 338 | at each end to record the actual string length (not including the |
| 339 | null byte terminator). */ |
| 340 | |
| 341 | lenelt = 2 + BYTES_TO_EXP_ELEM (len + 1); |
| 342 | |
| 343 | increase_expout_size (ps, lenelt); |
| 344 | |
| 345 | /* Write the leading length expression element (which advances the current |
| 346 | expression element index), then write the string constant followed by a |
| 347 | terminating null byte, and then write the trailing length expression |
| 348 | element. */ |
| 349 | |
| 350 | write_exp_elt_longcst (ps, (LONGEST) len); |
| 351 | strdata = (char *) &ps->expout->elts[ps->expout_ptr]; |
| 352 | memcpy (strdata, str.ptr, len); |
| 353 | *(strdata + len) = '\0'; |
| 354 | ps->expout_ptr += lenelt - 2; |
| 355 | write_exp_elt_longcst (ps, (LONGEST) len); |
| 356 | } |
| 357 | |
| 358 | /* Add a vector of string constants to the end of the expression. |
| 359 | |
| 360 | This adds an OP_STRING operation, but encodes the contents |
| 361 | differently from write_exp_string. The language is expected to |
| 362 | handle evaluation of this expression itself. |
| 363 | |
| 364 | After the usual OP_STRING header, TYPE is written into the |
| 365 | expression as a long constant. The interpretation of this field is |
| 366 | up to the language evaluator. |
| 367 | |
| 368 | Next, each string in VEC is written. The length is written as a |
| 369 | long constant, followed by the contents of the string. */ |
| 370 | |
| 371 | void |
| 372 | write_exp_string_vector (struct parser_state *ps, int type, |
| 373 | struct stoken_vector *vec) |
| 374 | { |
| 375 | int i, len; |
| 376 | size_t n_slots; |
| 377 | |
| 378 | /* Compute the size. We compute the size in number of slots to |
| 379 | avoid issues with string padding. */ |
| 380 | n_slots = 0; |
| 381 | for (i = 0; i < vec->len; ++i) |
| 382 | { |
| 383 | /* One slot for the length of this element, plus the number of |
| 384 | slots needed for this string. */ |
| 385 | n_slots += 1 + BYTES_TO_EXP_ELEM (vec->tokens[i].length); |
| 386 | } |
| 387 | |
| 388 | /* One more slot for the type of the string. */ |
| 389 | ++n_slots; |
| 390 | |
| 391 | /* Now compute a phony string length. */ |
| 392 | len = EXP_ELEM_TO_BYTES (n_slots) - 1; |
| 393 | |
| 394 | n_slots += 4; |
| 395 | increase_expout_size (ps, n_slots); |
| 396 | |
| 397 | write_exp_elt_opcode (ps, OP_STRING); |
| 398 | write_exp_elt_longcst (ps, len); |
| 399 | write_exp_elt_longcst (ps, type); |
| 400 | |
| 401 | for (i = 0; i < vec->len; ++i) |
| 402 | { |
| 403 | write_exp_elt_longcst (ps, vec->tokens[i].length); |
| 404 | memcpy (&ps->expout->elts[ps->expout_ptr], vec->tokens[i].ptr, |
| 405 | vec->tokens[i].length); |
| 406 | ps->expout_ptr += BYTES_TO_EXP_ELEM (vec->tokens[i].length); |
| 407 | } |
| 408 | |
| 409 | write_exp_elt_longcst (ps, len); |
| 410 | write_exp_elt_opcode (ps, OP_STRING); |
| 411 | } |
| 412 | |
| 413 | /* Add a bitstring constant to the end of the expression. |
| 414 | |
| 415 | Bitstring constants are stored by first writing an expression element |
| 416 | that contains the length of the bitstring (in bits), then stuffing the |
| 417 | bitstring constant itself into however many expression elements are |
| 418 | needed to hold it, and then writing another expression element that |
| 419 | contains the length of the bitstring. I.e. an expression element at |
| 420 | each end of the bitstring records the bitstring length, so you can skip |
| 421 | over the expression elements containing the actual bitstring bytes from |
| 422 | either end of the bitstring. */ |
| 423 | |
| 424 | void |
| 425 | write_exp_bitstring (struct parser_state *ps, struct stoken str) |
| 426 | { |
| 427 | int bits = str.length; /* length in bits */ |
| 428 | int len = (bits + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT; |
| 429 | size_t lenelt; |
| 430 | char *strdata; |
| 431 | |
| 432 | /* Compute the number of expression elements required to hold the bitstring, |
| 433 | along with one expression element at each end to record the actual |
| 434 | bitstring length in bits. */ |
| 435 | |
| 436 | lenelt = 2 + BYTES_TO_EXP_ELEM (len); |
| 437 | |
| 438 | increase_expout_size (ps, lenelt); |
| 439 | |
| 440 | /* Write the leading length expression element (which advances the current |
| 441 | expression element index), then write the bitstring constant, and then |
| 442 | write the trailing length expression element. */ |
| 443 | |
| 444 | write_exp_elt_longcst (ps, (LONGEST) bits); |
| 445 | strdata = (char *) &ps->expout->elts[ps->expout_ptr]; |
| 446 | memcpy (strdata, str.ptr, len); |
| 447 | ps->expout_ptr += lenelt - 2; |
| 448 | write_exp_elt_longcst (ps, (LONGEST) bits); |
| 449 | } |
| 450 | |
| 451 | /* Return the type of MSYMBOL, a minimal symbol of OBJFILE. If |
| 452 | ADDRESS_P is not NULL, set it to the MSYMBOL's resolved |
| 453 | address. */ |
| 454 | |
| 455 | type * |
| 456 | find_minsym_type_and_address (minimal_symbol *msymbol, |
| 457 | struct objfile *objfile, |
| 458 | CORE_ADDR *address_p) |
| 459 | { |
| 460 | bound_minimal_symbol bound_msym = {msymbol, objfile}; |
| 461 | struct gdbarch *gdbarch = get_objfile_arch (objfile); |
| 462 | struct obj_section *section = MSYMBOL_OBJ_SECTION (objfile, msymbol); |
| 463 | enum minimal_symbol_type type = MSYMBOL_TYPE (msymbol); |
| 464 | CORE_ADDR pc; |
| 465 | |
| 466 | bool is_tls = (section != NULL |
| 467 | && section->the_bfd_section->flags & SEC_THREAD_LOCAL); |
| 468 | |
| 469 | /* Addresses of TLS symbols are really offsets into a |
| 470 | per-objfile/per-thread storage block. */ |
| 471 | CORE_ADDR addr = (is_tls |
| 472 | ? MSYMBOL_VALUE_RAW_ADDRESS (bound_msym.minsym) |
| 473 | : BMSYMBOL_VALUE_ADDRESS (bound_msym)); |
| 474 | |
| 475 | /* The minimal symbol might point to a function descriptor; |
| 476 | resolve it to the actual code address instead. */ |
| 477 | pc = gdbarch_convert_from_func_ptr_addr (gdbarch, addr, ¤t_target); |
| 478 | if (pc != addr) |
| 479 | { |
| 480 | struct bound_minimal_symbol ifunc_msym = lookup_minimal_symbol_by_pc (pc); |
| 481 | |
| 482 | /* In this case, assume we have a code symbol instead of |
| 483 | a data symbol. */ |
| 484 | |
| 485 | if (ifunc_msym.minsym != NULL |
| 486 | && MSYMBOL_TYPE (ifunc_msym.minsym) == mst_text_gnu_ifunc |
| 487 | && BMSYMBOL_VALUE_ADDRESS (ifunc_msym) == pc) |
| 488 | { |
| 489 | /* A function descriptor has been resolved but PC is still in the |
| 490 | STT_GNU_IFUNC resolver body (such as because inferior does not |
| 491 | run to be able to call it). */ |
| 492 | |
| 493 | type = mst_text_gnu_ifunc; |
| 494 | } |
| 495 | else |
| 496 | type = mst_text; |
| 497 | section = NULL; |
| 498 | addr = pc; |
| 499 | } |
| 500 | |
| 501 | if (overlay_debugging) |
| 502 | addr = symbol_overlayed_address (addr, section); |
| 503 | |
| 504 | if (is_tls) |
| 505 | { |
| 506 | /* Skip translation if caller does not need the address. */ |
| 507 | if (address_p != NULL) |
| 508 | *address_p = target_translate_tls_address (objfile, addr); |
| 509 | return objfile_type (objfile)->nodebug_tls_symbol; |
| 510 | } |
| 511 | |
| 512 | if (address_p != NULL) |
| 513 | *address_p = addr; |
| 514 | |
| 515 | switch (type) |
| 516 | { |
| 517 | case mst_text: |
| 518 | case mst_file_text: |
| 519 | case mst_solib_trampoline: |
| 520 | return objfile_type (objfile)->nodebug_text_symbol; |
| 521 | |
| 522 | case mst_text_gnu_ifunc: |
| 523 | return objfile_type (objfile)->nodebug_text_gnu_ifunc_symbol; |
| 524 | |
| 525 | case mst_data: |
| 526 | case mst_file_data: |
| 527 | case mst_bss: |
| 528 | case mst_file_bss: |
| 529 | return objfile_type (objfile)->nodebug_data_symbol; |
| 530 | |
| 531 | case mst_slot_got_plt: |
| 532 | return objfile_type (objfile)->nodebug_got_plt_symbol; |
| 533 | |
| 534 | default: |
| 535 | return objfile_type (objfile)->nodebug_unknown_symbol; |
| 536 | } |
| 537 | } |
| 538 | |
| 539 | /* Add the appropriate elements for a minimal symbol to the end of |
| 540 | the expression. */ |
| 541 | |
| 542 | void |
| 543 | write_exp_msymbol (struct parser_state *ps, |
| 544 | struct bound_minimal_symbol bound_msym) |
| 545 | { |
| 546 | write_exp_elt_opcode (ps, OP_VAR_MSYM_VALUE); |
| 547 | write_exp_elt_objfile (ps, bound_msym.objfile); |
| 548 | write_exp_elt_msym (ps, bound_msym.minsym); |
| 549 | write_exp_elt_opcode (ps, OP_VAR_MSYM_VALUE); |
| 550 | } |
| 551 | |
| 552 | /* Mark the current index as the starting location of a structure |
| 553 | expression. This is used when completing on field names. */ |
| 554 | |
| 555 | void |
| 556 | mark_struct_expression (struct parser_state *ps) |
| 557 | { |
| 558 | gdb_assert (parse_completion |
| 559 | && expout_tag_completion_type == TYPE_CODE_UNDEF); |
| 560 | expout_last_struct = ps->expout_ptr; |
| 561 | } |
| 562 | |
| 563 | /* Indicate that the current parser invocation is completing a tag. |
| 564 | TAG is the type code of the tag, and PTR and LENGTH represent the |
| 565 | start of the tag name. */ |
| 566 | |
| 567 | void |
| 568 | mark_completion_tag (enum type_code tag, const char *ptr, int length) |
| 569 | { |
| 570 | gdb_assert (parse_completion |
| 571 | && expout_tag_completion_type == TYPE_CODE_UNDEF |
| 572 | && expout_completion_name == NULL |
| 573 | && expout_last_struct == -1); |
| 574 | gdb_assert (tag == TYPE_CODE_UNION |
| 575 | || tag == TYPE_CODE_STRUCT |
| 576 | || tag == TYPE_CODE_ENUM); |
| 577 | expout_tag_completion_type = tag; |
| 578 | expout_completion_name.reset (xstrndup (ptr, length)); |
| 579 | } |
| 580 | |
| 581 | \f |
| 582 | /* Recognize tokens that start with '$'. These include: |
| 583 | |
| 584 | $regname A native register name or a "standard |
| 585 | register name". |
| 586 | |
| 587 | $variable A convenience variable with a name chosen |
| 588 | by the user. |
| 589 | |
| 590 | $digits Value history with index <digits>, starting |
| 591 | from the first value which has index 1. |
| 592 | |
| 593 | $$digits Value history with index <digits> relative |
| 594 | to the last value. I.e. $$0 is the last |
| 595 | value, $$1 is the one previous to that, $$2 |
| 596 | is the one previous to $$1, etc. |
| 597 | |
| 598 | $ | $0 | $$0 The last value in the value history. |
| 599 | |
| 600 | $$ An abbreviation for the second to the last |
| 601 | value in the value history, I.e. $$1 */ |
| 602 | |
| 603 | void |
| 604 | write_dollar_variable (struct parser_state *ps, struct stoken str) |
| 605 | { |
| 606 | struct block_symbol sym; |
| 607 | struct bound_minimal_symbol msym; |
| 608 | struct internalvar *isym = NULL; |
| 609 | |
| 610 | /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1) |
| 611 | and $$digits (equivalent to $<-digits> if you could type that). */ |
| 612 | |
| 613 | int negate = 0; |
| 614 | int i = 1; |
| 615 | /* Double dollar means negate the number and add -1 as well. |
| 616 | Thus $$ alone means -1. */ |
| 617 | if (str.length >= 2 && str.ptr[1] == '$') |
| 618 | { |
| 619 | negate = 1; |
| 620 | i = 2; |
| 621 | } |
| 622 | if (i == str.length) |
| 623 | { |
| 624 | /* Just dollars (one or two). */ |
| 625 | i = -negate; |
| 626 | goto handle_last; |
| 627 | } |
| 628 | /* Is the rest of the token digits? */ |
| 629 | for (; i < str.length; i++) |
| 630 | if (!(str.ptr[i] >= '0' && str.ptr[i] <= '9')) |
| 631 | break; |
| 632 | if (i == str.length) |
| 633 | { |
| 634 | i = atoi (str.ptr + 1 + negate); |
| 635 | if (negate) |
| 636 | i = -i; |
| 637 | goto handle_last; |
| 638 | } |
| 639 | |
| 640 | /* Handle tokens that refer to machine registers: |
| 641 | $ followed by a register name. */ |
| 642 | i = user_reg_map_name_to_regnum (parse_gdbarch (ps), |
| 643 | str.ptr + 1, str.length - 1); |
| 644 | if (i >= 0) |
| 645 | goto handle_register; |
| 646 | |
| 647 | /* Any names starting with $ are probably debugger internal variables. */ |
| 648 | |
| 649 | isym = lookup_only_internalvar (copy_name (str) + 1); |
| 650 | if (isym) |
| 651 | { |
| 652 | write_exp_elt_opcode (ps, OP_INTERNALVAR); |
| 653 | write_exp_elt_intern (ps, isym); |
| 654 | write_exp_elt_opcode (ps, OP_INTERNALVAR); |
| 655 | return; |
| 656 | } |
| 657 | |
| 658 | /* On some systems, such as HP-UX and hppa-linux, certain system routines |
| 659 | have names beginning with $ or $$. Check for those, first. */ |
| 660 | |
| 661 | sym = lookup_symbol (copy_name (str), (struct block *) NULL, |
| 662 | VAR_DOMAIN, NULL); |
| 663 | if (sym.symbol) |
| 664 | { |
| 665 | write_exp_elt_opcode (ps, OP_VAR_VALUE); |
| 666 | write_exp_elt_block (ps, sym.block); |
| 667 | write_exp_elt_sym (ps, sym.symbol); |
| 668 | write_exp_elt_opcode (ps, OP_VAR_VALUE); |
| 669 | return; |
| 670 | } |
| 671 | msym = lookup_bound_minimal_symbol (copy_name (str)); |
| 672 | if (msym.minsym) |
| 673 | { |
| 674 | write_exp_msymbol (ps, msym); |
| 675 | return; |
| 676 | } |
| 677 | |
| 678 | /* Any other names are assumed to be debugger internal variables. */ |
| 679 | |
| 680 | write_exp_elt_opcode (ps, OP_INTERNALVAR); |
| 681 | write_exp_elt_intern (ps, create_internalvar (copy_name (str) + 1)); |
| 682 | write_exp_elt_opcode (ps, OP_INTERNALVAR); |
| 683 | return; |
| 684 | handle_last: |
| 685 | write_exp_elt_opcode (ps, OP_LAST); |
| 686 | write_exp_elt_longcst (ps, (LONGEST) i); |
| 687 | write_exp_elt_opcode (ps, OP_LAST); |
| 688 | return; |
| 689 | handle_register: |
| 690 | write_exp_elt_opcode (ps, OP_REGISTER); |
| 691 | str.length--; |
| 692 | str.ptr++; |
| 693 | write_exp_string (ps, str); |
| 694 | write_exp_elt_opcode (ps, OP_REGISTER); |
| 695 | innermost_block.update (expression_context_block, |
| 696 | INNERMOST_BLOCK_FOR_REGISTERS); |
| 697 | return; |
| 698 | } |
| 699 | |
| 700 | |
| 701 | const char * |
| 702 | find_template_name_end (const char *p) |
| 703 | { |
| 704 | int depth = 1; |
| 705 | int just_seen_right = 0; |
| 706 | int just_seen_colon = 0; |
| 707 | int just_seen_space = 0; |
| 708 | |
| 709 | if (!p || (*p != '<')) |
| 710 | return 0; |
| 711 | |
| 712 | while (*++p) |
| 713 | { |
| 714 | switch (*p) |
| 715 | { |
| 716 | case '\'': |
| 717 | case '\"': |
| 718 | case '{': |
| 719 | case '}': |
| 720 | /* In future, may want to allow these?? */ |
| 721 | return 0; |
| 722 | case '<': |
| 723 | depth++; /* start nested template */ |
| 724 | if (just_seen_colon || just_seen_right || just_seen_space) |
| 725 | return 0; /* but not after : or :: or > or space */ |
| 726 | break; |
| 727 | case '>': |
| 728 | if (just_seen_colon || just_seen_right) |
| 729 | return 0; /* end a (nested?) template */ |
| 730 | just_seen_right = 1; /* but not after : or :: */ |
| 731 | if (--depth == 0) /* also disallow >>, insist on > > */ |
| 732 | return ++p; /* if outermost ended, return */ |
| 733 | break; |
| 734 | case ':': |
| 735 | if (just_seen_space || (just_seen_colon > 1)) |
| 736 | return 0; /* nested class spec coming up */ |
| 737 | just_seen_colon++; /* we allow :: but not :::: */ |
| 738 | break; |
| 739 | case ' ': |
| 740 | break; |
| 741 | default: |
| 742 | if (!((*p >= 'a' && *p <= 'z') || /* allow token chars */ |
| 743 | (*p >= 'A' && *p <= 'Z') || |
| 744 | (*p >= '0' && *p <= '9') || |
| 745 | (*p == '_') || (*p == ',') || /* commas for template args */ |
| 746 | (*p == '&') || (*p == '*') || /* pointer and ref types */ |
| 747 | (*p == '(') || (*p == ')') || /* function types */ |
| 748 | (*p == '[') || (*p == ']'))) /* array types */ |
| 749 | return 0; |
| 750 | } |
| 751 | if (*p != ' ') |
| 752 | just_seen_space = 0; |
| 753 | if (*p != ':') |
| 754 | just_seen_colon = 0; |
| 755 | if (*p != '>') |
| 756 | just_seen_right = 0; |
| 757 | } |
| 758 | return 0; |
| 759 | } |
| 760 | \f |
| 761 | |
| 762 | /* Return a null-terminated temporary copy of the name of a string token. |
| 763 | |
| 764 | Tokens that refer to names do so with explicit pointer and length, |
| 765 | so they can share the storage that lexptr is parsing. |
| 766 | When it is necessary to pass a name to a function that expects |
| 767 | a null-terminated string, the substring is copied out |
| 768 | into a separate block of storage. |
| 769 | |
| 770 | N.B. A single buffer is reused on each call. */ |
| 771 | |
| 772 | char * |
| 773 | copy_name (struct stoken token) |
| 774 | { |
| 775 | /* A temporary buffer for identifiers, so we can null-terminate them. |
| 776 | We allocate this with xrealloc. parse_exp_1 used to allocate with |
| 777 | alloca, using the size of the whole expression as a conservative |
| 778 | estimate of the space needed. However, macro expansion can |
| 779 | introduce names longer than the original expression; there's no |
| 780 | practical way to know beforehand how large that might be. */ |
| 781 | static char *namecopy; |
| 782 | static size_t namecopy_size; |
| 783 | |
| 784 | /* Make sure there's enough space for the token. */ |
| 785 | if (namecopy_size < token.length + 1) |
| 786 | { |
| 787 | namecopy_size = token.length + 1; |
| 788 | namecopy = (char *) xrealloc (namecopy, token.length + 1); |
| 789 | } |
| 790 | |
| 791 | memcpy (namecopy, token.ptr, token.length); |
| 792 | namecopy[token.length] = 0; |
| 793 | |
| 794 | return namecopy; |
| 795 | } |
| 796 | \f |
| 797 | |
| 798 | /* See comments on parser-defs.h. */ |
| 799 | |
| 800 | int |
| 801 | prefixify_expression (struct expression *expr) |
| 802 | { |
| 803 | int len = sizeof (struct expression) + EXP_ELEM_TO_BYTES (expr->nelts); |
| 804 | struct expression *temp; |
| 805 | int inpos = expr->nelts, outpos = 0; |
| 806 | |
| 807 | temp = (struct expression *) alloca (len); |
| 808 | |
| 809 | /* Copy the original expression into temp. */ |
| 810 | memcpy (temp, expr, len); |
| 811 | |
| 812 | return prefixify_subexp (temp, expr, inpos, outpos); |
| 813 | } |
| 814 | |
| 815 | /* Return the number of exp_elements in the postfix subexpression |
| 816 | of EXPR whose operator is at index ENDPOS - 1 in EXPR. */ |
| 817 | |
| 818 | static int |
| 819 | length_of_subexp (struct expression *expr, int endpos) |
| 820 | { |
| 821 | int oplen, args; |
| 822 | |
| 823 | operator_length (expr, endpos, &oplen, &args); |
| 824 | |
| 825 | while (args > 0) |
| 826 | { |
| 827 | oplen += length_of_subexp (expr, endpos - oplen); |
| 828 | args--; |
| 829 | } |
| 830 | |
| 831 | return oplen; |
| 832 | } |
| 833 | |
| 834 | /* Sets *OPLENP to the length of the operator whose (last) index is |
| 835 | ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that |
| 836 | operator takes. */ |
| 837 | |
| 838 | void |
| 839 | operator_length (const struct expression *expr, int endpos, int *oplenp, |
| 840 | int *argsp) |
| 841 | { |
| 842 | expr->language_defn->la_exp_desc->operator_length (expr, endpos, |
| 843 | oplenp, argsp); |
| 844 | } |
| 845 | |
| 846 | /* Default value for operator_length in exp_descriptor vectors. */ |
| 847 | |
| 848 | void |
| 849 | operator_length_standard (const struct expression *expr, int endpos, |
| 850 | int *oplenp, int *argsp) |
| 851 | { |
| 852 | int oplen = 1; |
| 853 | int args = 0; |
| 854 | enum range_type range_type; |
| 855 | int i; |
| 856 | |
| 857 | if (endpos < 1) |
| 858 | error (_("?error in operator_length_standard")); |
| 859 | |
| 860 | i = (int) expr->elts[endpos - 1].opcode; |
| 861 | |
| 862 | switch (i) |
| 863 | { |
| 864 | /* C++ */ |
| 865 | case OP_SCOPE: |
| 866 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); |
| 867 | oplen = 5 + BYTES_TO_EXP_ELEM (oplen + 1); |
| 868 | break; |
| 869 | |
| 870 | case OP_LONG: |
| 871 | case OP_FLOAT: |
| 872 | case OP_VAR_VALUE: |
| 873 | case OP_VAR_MSYM_VALUE: |
| 874 | oplen = 4; |
| 875 | break; |
| 876 | |
| 877 | case OP_FUNC_STATIC_VAR: |
| 878 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); |
| 879 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1); |
| 880 | args = 1; |
| 881 | break; |
| 882 | |
| 883 | case OP_TYPE: |
| 884 | case OP_BOOL: |
| 885 | case OP_LAST: |
| 886 | case OP_INTERNALVAR: |
| 887 | case OP_VAR_ENTRY_VALUE: |
| 888 | oplen = 3; |
| 889 | break; |
| 890 | |
| 891 | case OP_COMPLEX: |
| 892 | oplen = 3; |
| 893 | args = 2; |
| 894 | break; |
| 895 | |
| 896 | case OP_FUNCALL: |
| 897 | case OP_F77_UNDETERMINED_ARGLIST: |
| 898 | oplen = 3; |
| 899 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); |
| 900 | break; |
| 901 | |
| 902 | case TYPE_INSTANCE: |
| 903 | oplen = 5 + longest_to_int (expr->elts[endpos - 2].longconst); |
| 904 | args = 1; |
| 905 | break; |
| 906 | |
| 907 | case OP_OBJC_MSGCALL: /* Objective C message (method) call. */ |
| 908 | oplen = 4; |
| 909 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); |
| 910 | break; |
| 911 | |
| 912 | case UNOP_MAX: |
| 913 | case UNOP_MIN: |
| 914 | oplen = 3; |
| 915 | break; |
| 916 | |
| 917 | case UNOP_CAST_TYPE: |
| 918 | case UNOP_DYNAMIC_CAST: |
| 919 | case UNOP_REINTERPRET_CAST: |
| 920 | case UNOP_MEMVAL_TYPE: |
| 921 | oplen = 1; |
| 922 | args = 2; |
| 923 | break; |
| 924 | |
| 925 | case BINOP_VAL: |
| 926 | case UNOP_CAST: |
| 927 | case UNOP_MEMVAL: |
| 928 | oplen = 3; |
| 929 | args = 1; |
| 930 | break; |
| 931 | |
| 932 | case UNOP_ABS: |
| 933 | case UNOP_CAP: |
| 934 | case UNOP_CHR: |
| 935 | case UNOP_FLOAT: |
| 936 | case UNOP_HIGH: |
| 937 | case UNOP_ODD: |
| 938 | case UNOP_ORD: |
| 939 | case UNOP_TRUNC: |
| 940 | case OP_TYPEOF: |
| 941 | case OP_DECLTYPE: |
| 942 | case OP_TYPEID: |
| 943 | oplen = 1; |
| 944 | args = 1; |
| 945 | break; |
| 946 | |
| 947 | case OP_ADL_FUNC: |
| 948 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); |
| 949 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1); |
| 950 | oplen++; |
| 951 | oplen++; |
| 952 | break; |
| 953 | |
| 954 | case STRUCTOP_STRUCT: |
| 955 | case STRUCTOP_PTR: |
| 956 | args = 1; |
| 957 | /* fall through */ |
| 958 | case OP_REGISTER: |
| 959 | case OP_M2_STRING: |
| 960 | case OP_STRING: |
| 961 | case OP_OBJC_NSSTRING: /* Objective C Foundation Class |
| 962 | NSString constant. */ |
| 963 | case OP_OBJC_SELECTOR: /* Objective C "@selector" pseudo-op. */ |
| 964 | case OP_NAME: |
| 965 | oplen = longest_to_int (expr->elts[endpos - 2].longconst); |
| 966 | oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1); |
| 967 | break; |
| 968 | |
| 969 | case OP_ARRAY: |
| 970 | oplen = 4; |
| 971 | args = longest_to_int (expr->elts[endpos - 2].longconst); |
| 972 | args -= longest_to_int (expr->elts[endpos - 3].longconst); |
| 973 | args += 1; |
| 974 | break; |
| 975 | |
| 976 | case TERNOP_COND: |
| 977 | case TERNOP_SLICE: |
| 978 | args = 3; |
| 979 | break; |
| 980 | |
| 981 | /* Modula-2 */ |
| 982 | case MULTI_SUBSCRIPT: |
| 983 | oplen = 3; |
| 984 | args = 1 + longest_to_int (expr->elts[endpos - 2].longconst); |
| 985 | break; |
| 986 | |
| 987 | case BINOP_ASSIGN_MODIFY: |
| 988 | oplen = 3; |
| 989 | args = 2; |
| 990 | break; |
| 991 | |
| 992 | /* C++ */ |
| 993 | case OP_THIS: |
| 994 | oplen = 2; |
| 995 | break; |
| 996 | |
| 997 | case OP_RANGE: |
| 998 | oplen = 3; |
| 999 | range_type = (enum range_type) |
| 1000 | longest_to_int (expr->elts[endpos - 2].longconst); |
| 1001 | |
| 1002 | switch (range_type) |
| 1003 | { |
| 1004 | case LOW_BOUND_DEFAULT: |
| 1005 | case HIGH_BOUND_DEFAULT: |
| 1006 | args = 1; |
| 1007 | break; |
| 1008 | case BOTH_BOUND_DEFAULT: |
| 1009 | args = 0; |
| 1010 | break; |
| 1011 | case NONE_BOUND_DEFAULT: |
| 1012 | args = 2; |
| 1013 | break; |
| 1014 | } |
| 1015 | |
| 1016 | break; |
| 1017 | |
| 1018 | default: |
| 1019 | args = 1 + (i < (int) BINOP_END); |
| 1020 | } |
| 1021 | |
| 1022 | *oplenp = oplen; |
| 1023 | *argsp = args; |
| 1024 | } |
| 1025 | |
| 1026 | /* Copy the subexpression ending just before index INEND in INEXPR |
| 1027 | into OUTEXPR, starting at index OUTBEG. |
| 1028 | In the process, convert it from suffix to prefix form. |
| 1029 | If EXPOUT_LAST_STRUCT is -1, then this function always returns -1. |
| 1030 | Otherwise, it returns the index of the subexpression which is the |
| 1031 | left-hand-side of the expression at EXPOUT_LAST_STRUCT. */ |
| 1032 | |
| 1033 | static int |
| 1034 | prefixify_subexp (struct expression *inexpr, |
| 1035 | struct expression *outexpr, int inend, int outbeg) |
| 1036 | { |
| 1037 | int oplen; |
| 1038 | int args; |
| 1039 | int i; |
| 1040 | int *arglens; |
| 1041 | int result = -1; |
| 1042 | |
| 1043 | operator_length (inexpr, inend, &oplen, &args); |
| 1044 | |
| 1045 | /* Copy the final operator itself, from the end of the input |
| 1046 | to the beginning of the output. */ |
| 1047 | inend -= oplen; |
| 1048 | memcpy (&outexpr->elts[outbeg], &inexpr->elts[inend], |
| 1049 | EXP_ELEM_TO_BYTES (oplen)); |
| 1050 | outbeg += oplen; |
| 1051 | |
| 1052 | if (expout_last_struct == inend) |
| 1053 | result = outbeg - oplen; |
| 1054 | |
| 1055 | /* Find the lengths of the arg subexpressions. */ |
| 1056 | arglens = (int *) alloca (args * sizeof (int)); |
| 1057 | for (i = args - 1; i >= 0; i--) |
| 1058 | { |
| 1059 | oplen = length_of_subexp (inexpr, inend); |
| 1060 | arglens[i] = oplen; |
| 1061 | inend -= oplen; |
| 1062 | } |
| 1063 | |
| 1064 | /* Now copy each subexpression, preserving the order of |
| 1065 | the subexpressions, but prefixifying each one. |
| 1066 | In this loop, inend starts at the beginning of |
| 1067 | the expression this level is working on |
| 1068 | and marches forward over the arguments. |
| 1069 | outbeg does similarly in the output. */ |
| 1070 | for (i = 0; i < args; i++) |
| 1071 | { |
| 1072 | int r; |
| 1073 | |
| 1074 | oplen = arglens[i]; |
| 1075 | inend += oplen; |
| 1076 | r = prefixify_subexp (inexpr, outexpr, inend, outbeg); |
| 1077 | if (r != -1) |
| 1078 | { |
| 1079 | /* Return immediately. We probably have only parsed a |
| 1080 | partial expression, so we don't want to try to reverse |
| 1081 | the other operands. */ |
| 1082 | return r; |
| 1083 | } |
| 1084 | outbeg += oplen; |
| 1085 | } |
| 1086 | |
| 1087 | return result; |
| 1088 | } |
| 1089 | \f |
| 1090 | /* Read an expression from the string *STRINGPTR points to, |
| 1091 | parse it, and return a pointer to a struct expression that we malloc. |
| 1092 | Use block BLOCK as the lexical context for variable names; |
| 1093 | if BLOCK is zero, use the block of the selected stack frame. |
| 1094 | Meanwhile, advance *STRINGPTR to point after the expression, |
| 1095 | at the first nonwhite character that is not part of the expression |
| 1096 | (possibly a null character). |
| 1097 | |
| 1098 | If COMMA is nonzero, stop if a comma is reached. */ |
| 1099 | |
| 1100 | expression_up |
| 1101 | parse_exp_1 (const char **stringptr, CORE_ADDR pc, const struct block *block, |
| 1102 | int comma) |
| 1103 | { |
| 1104 | return parse_exp_in_context (stringptr, pc, block, comma, 0, NULL); |
| 1105 | } |
| 1106 | |
| 1107 | static expression_up |
| 1108 | parse_exp_in_context (const char **stringptr, CORE_ADDR pc, |
| 1109 | const struct block *block, |
| 1110 | int comma, int void_context_p, int *out_subexp) |
| 1111 | { |
| 1112 | return parse_exp_in_context_1 (stringptr, pc, block, comma, |
| 1113 | void_context_p, out_subexp); |
| 1114 | } |
| 1115 | |
| 1116 | /* As for parse_exp_1, except that if VOID_CONTEXT_P, then |
| 1117 | no value is expected from the expression. |
| 1118 | OUT_SUBEXP is set when attempting to complete a field name; in this |
| 1119 | case it is set to the index of the subexpression on the |
| 1120 | left-hand-side of the struct op. If not doing such completion, it |
| 1121 | is left untouched. */ |
| 1122 | |
| 1123 | static expression_up |
| 1124 | parse_exp_in_context_1 (const char **stringptr, CORE_ADDR pc, |
| 1125 | const struct block *block, |
| 1126 | int comma, int void_context_p, int *out_subexp) |
| 1127 | { |
| 1128 | const struct language_defn *lang = NULL; |
| 1129 | int subexp; |
| 1130 | |
| 1131 | lexptr = *stringptr; |
| 1132 | prev_lexptr = NULL; |
| 1133 | |
| 1134 | paren_depth = 0; |
| 1135 | type_stack.depth = 0; |
| 1136 | expout_last_struct = -1; |
| 1137 | expout_tag_completion_type = TYPE_CODE_UNDEF; |
| 1138 | expout_completion_name.reset (); |
| 1139 | |
| 1140 | comma_terminates = comma; |
| 1141 | |
| 1142 | if (lexptr == 0 || *lexptr == 0) |
| 1143 | error_no_arg (_("expression to compute")); |
| 1144 | |
| 1145 | std::vector<int> funcalls; |
| 1146 | scoped_restore save_funcall_chain = make_scoped_restore (&funcall_chain, |
| 1147 | &funcalls); |
| 1148 | |
| 1149 | expression_context_block = block; |
| 1150 | |
| 1151 | /* If no context specified, try using the current frame, if any. */ |
| 1152 | if (!expression_context_block) |
| 1153 | expression_context_block = get_selected_block (&expression_context_pc); |
| 1154 | else if (pc == 0) |
| 1155 | expression_context_pc = BLOCK_START (expression_context_block); |
| 1156 | else |
| 1157 | expression_context_pc = pc; |
| 1158 | |
| 1159 | /* Fall back to using the current source static context, if any. */ |
| 1160 | |
| 1161 | if (!expression_context_block) |
| 1162 | { |
| 1163 | struct symtab_and_line cursal = get_current_source_symtab_and_line (); |
| 1164 | if (cursal.symtab) |
| 1165 | expression_context_block |
| 1166 | = BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (cursal.symtab), |
| 1167 | STATIC_BLOCK); |
| 1168 | if (expression_context_block) |
| 1169 | expression_context_pc = BLOCK_START (expression_context_block); |
| 1170 | } |
| 1171 | |
| 1172 | if (language_mode == language_mode_auto && block != NULL) |
| 1173 | { |
| 1174 | /* Find the language associated to the given context block. |
| 1175 | Default to the current language if it can not be determined. |
| 1176 | |
| 1177 | Note that using the language corresponding to the current frame |
| 1178 | can sometimes give unexpected results. For instance, this |
| 1179 | routine is often called several times during the inferior |
| 1180 | startup phase to re-parse breakpoint expressions after |
| 1181 | a new shared library has been loaded. The language associated |
| 1182 | to the current frame at this moment is not relevant for |
| 1183 | the breakpoint. Using it would therefore be silly, so it seems |
| 1184 | better to rely on the current language rather than relying on |
| 1185 | the current frame language to parse the expression. That's why |
| 1186 | we do the following language detection only if the context block |
| 1187 | has been specifically provided. */ |
| 1188 | struct symbol *func = block_linkage_function (block); |
| 1189 | |
| 1190 | if (func != NULL) |
| 1191 | lang = language_def (SYMBOL_LANGUAGE (func)); |
| 1192 | if (lang == NULL || lang->la_language == language_unknown) |
| 1193 | lang = current_language; |
| 1194 | } |
| 1195 | else |
| 1196 | lang = current_language; |
| 1197 | |
| 1198 | /* get_current_arch may reset CURRENT_LANGUAGE via select_frame. |
| 1199 | While we need CURRENT_LANGUAGE to be set to LANG (for lookup_symbol |
| 1200 | and others called from *.y) ensure CURRENT_LANGUAGE gets restored |
| 1201 | to the value matching SELECTED_FRAME as set by get_current_arch. */ |
| 1202 | |
| 1203 | parser_state ps (10, lang, get_current_arch ()); |
| 1204 | |
| 1205 | scoped_restore_current_language lang_saver; |
| 1206 | set_language (lang->la_language); |
| 1207 | |
| 1208 | TRY |
| 1209 | { |
| 1210 | if (lang->la_parser (&ps)) |
| 1211 | lang->la_error (NULL); |
| 1212 | } |
| 1213 | CATCH (except, RETURN_MASK_ALL) |
| 1214 | { |
| 1215 | if (! parse_completion) |
| 1216 | throw_exception (except); |
| 1217 | } |
| 1218 | END_CATCH |
| 1219 | |
| 1220 | /* We have to operate on an "expression *", due to la_post_parser, |
| 1221 | which explains this funny-looking double release. */ |
| 1222 | expression_up result = ps.release (); |
| 1223 | |
| 1224 | /* Convert expression from postfix form as generated by yacc |
| 1225 | parser, to a prefix form. */ |
| 1226 | |
| 1227 | if (expressiondebug) |
| 1228 | dump_raw_expression (result.get (), gdb_stdlog, |
| 1229 | "before conversion to prefix form"); |
| 1230 | |
| 1231 | subexp = prefixify_expression (result.get ()); |
| 1232 | if (out_subexp) |
| 1233 | *out_subexp = subexp; |
| 1234 | |
| 1235 | lang->la_post_parser (&result, void_context_p); |
| 1236 | |
| 1237 | if (expressiondebug) |
| 1238 | dump_prefix_expression (result.get (), gdb_stdlog); |
| 1239 | |
| 1240 | *stringptr = lexptr; |
| 1241 | return result; |
| 1242 | } |
| 1243 | |
| 1244 | /* Parse STRING as an expression, and complain if this fails |
| 1245 | to use up all of the contents of STRING. */ |
| 1246 | |
| 1247 | expression_up |
| 1248 | parse_expression (const char *string) |
| 1249 | { |
| 1250 | expression_up exp = parse_exp_1 (&string, 0, 0, 0); |
| 1251 | if (*string) |
| 1252 | error (_("Junk after end of expression.")); |
| 1253 | return exp; |
| 1254 | } |
| 1255 | |
| 1256 | /* Same as parse_expression, but using the given language (LANG) |
| 1257 | to parse the expression. */ |
| 1258 | |
| 1259 | expression_up |
| 1260 | parse_expression_with_language (const char *string, enum language lang) |
| 1261 | { |
| 1262 | gdb::optional<scoped_restore_current_language> lang_saver; |
| 1263 | if (current_language->la_language != lang) |
| 1264 | { |
| 1265 | lang_saver.emplace (); |
| 1266 | set_language (lang); |
| 1267 | } |
| 1268 | |
| 1269 | return parse_expression (string); |
| 1270 | } |
| 1271 | |
| 1272 | /* Parse STRING as an expression. If parsing ends in the middle of a |
| 1273 | field reference, return the type of the left-hand-side of the |
| 1274 | reference; furthermore, if the parsing ends in the field name, |
| 1275 | return the field name in *NAME. If the parsing ends in the middle |
| 1276 | of a field reference, but the reference is somehow invalid, throw |
| 1277 | an exception. In all other cases, return NULL. */ |
| 1278 | |
| 1279 | struct type * |
| 1280 | parse_expression_for_completion (const char *string, |
| 1281 | gdb::unique_xmalloc_ptr<char> *name, |
| 1282 | enum type_code *code) |
| 1283 | { |
| 1284 | expression_up exp; |
| 1285 | struct value *val; |
| 1286 | int subexp; |
| 1287 | |
| 1288 | TRY |
| 1289 | { |
| 1290 | parse_completion = 1; |
| 1291 | exp = parse_exp_in_context (&string, 0, 0, 0, 0, &subexp); |
| 1292 | } |
| 1293 | CATCH (except, RETURN_MASK_ERROR) |
| 1294 | { |
| 1295 | /* Nothing, EXP remains NULL. */ |
| 1296 | } |
| 1297 | END_CATCH |
| 1298 | |
| 1299 | parse_completion = 0; |
| 1300 | if (exp == NULL) |
| 1301 | return NULL; |
| 1302 | |
| 1303 | if (expout_tag_completion_type != TYPE_CODE_UNDEF) |
| 1304 | { |
| 1305 | *code = expout_tag_completion_type; |
| 1306 | *name = std::move (expout_completion_name); |
| 1307 | return NULL; |
| 1308 | } |
| 1309 | |
| 1310 | if (expout_last_struct == -1) |
| 1311 | return NULL; |
| 1312 | |
| 1313 | const char *fieldname = extract_field_op (exp.get (), &subexp); |
| 1314 | if (fieldname == NULL) |
| 1315 | { |
| 1316 | name->reset (); |
| 1317 | return NULL; |
| 1318 | } |
| 1319 | |
| 1320 | name->reset (xstrdup (fieldname)); |
| 1321 | /* This might throw an exception. If so, we want to let it |
| 1322 | propagate. */ |
| 1323 | val = evaluate_subexpression_type (exp.get (), subexp); |
| 1324 | |
| 1325 | return value_type (val); |
| 1326 | } |
| 1327 | |
| 1328 | /* A post-parser that does nothing. */ |
| 1329 | |
| 1330 | void |
| 1331 | null_post_parser (expression_up *exp, int void_context_p) |
| 1332 | { |
| 1333 | } |
| 1334 | |
| 1335 | /* Parse floating point value P of length LEN. |
| 1336 | Return false if invalid, true if valid. |
| 1337 | The successfully parsed number is stored in DATA in |
| 1338 | target format for floating-point type TYPE. |
| 1339 | |
| 1340 | NOTE: This accepts the floating point syntax that sscanf accepts. */ |
| 1341 | |
| 1342 | bool |
| 1343 | parse_float (const char *p, int len, |
| 1344 | const struct type *type, gdb_byte *data) |
| 1345 | { |
| 1346 | return target_float_from_string (data, type, std::string (p, len)); |
| 1347 | } |
| 1348 | \f |
| 1349 | /* Stuff for maintaining a stack of types. Currently just used by C, but |
| 1350 | probably useful for any language which declares its types "backwards". */ |
| 1351 | |
| 1352 | /* Ensure that there are HOWMUCH open slots on the type stack STACK. */ |
| 1353 | |
| 1354 | static void |
| 1355 | type_stack_reserve (struct type_stack *stack, int howmuch) |
| 1356 | { |
| 1357 | if (stack->depth + howmuch >= stack->size) |
| 1358 | { |
| 1359 | stack->size *= 2; |
| 1360 | if (stack->size < howmuch) |
| 1361 | stack->size = howmuch; |
| 1362 | stack->elements = XRESIZEVEC (union type_stack_elt, stack->elements, |
| 1363 | stack->size); |
| 1364 | } |
| 1365 | } |
| 1366 | |
| 1367 | /* Ensure that there is a single open slot in the global type stack. */ |
| 1368 | |
| 1369 | static void |
| 1370 | check_type_stack_depth (void) |
| 1371 | { |
| 1372 | type_stack_reserve (&type_stack, 1); |
| 1373 | } |
| 1374 | |
| 1375 | /* A helper function for insert_type and insert_type_address_space. |
| 1376 | This does work of expanding the type stack and inserting the new |
| 1377 | element, ELEMENT, into the stack at location SLOT. */ |
| 1378 | |
| 1379 | static void |
| 1380 | insert_into_type_stack (int slot, union type_stack_elt element) |
| 1381 | { |
| 1382 | check_type_stack_depth (); |
| 1383 | |
| 1384 | if (slot < type_stack.depth) |
| 1385 | memmove (&type_stack.elements[slot + 1], &type_stack.elements[slot], |
| 1386 | (type_stack.depth - slot) * sizeof (union type_stack_elt)); |
| 1387 | type_stack.elements[slot] = element; |
| 1388 | ++type_stack.depth; |
| 1389 | } |
| 1390 | |
| 1391 | /* Insert a new type, TP, at the bottom of the type stack. If TP is |
| 1392 | tp_pointer, tp_reference or tp_rvalue_reference, it is inserted at the |
| 1393 | bottom. If TP is a qualifier, it is inserted at slot 1 (just above a |
| 1394 | previous tp_pointer) if there is anything on the stack, or simply pushed |
| 1395 | if the stack is empty. Other values for TP are invalid. */ |
| 1396 | |
| 1397 | void |
| 1398 | insert_type (enum type_pieces tp) |
| 1399 | { |
| 1400 | union type_stack_elt element; |
| 1401 | int slot; |
| 1402 | |
| 1403 | gdb_assert (tp == tp_pointer || tp == tp_reference |
| 1404 | || tp == tp_rvalue_reference || tp == tp_const |
| 1405 | || tp == tp_volatile); |
| 1406 | |
| 1407 | /* If there is anything on the stack (we know it will be a |
| 1408 | tp_pointer), insert the qualifier above it. Otherwise, simply |
| 1409 | push this on the top of the stack. */ |
| 1410 | if (type_stack.depth && (tp == tp_const || tp == tp_volatile)) |
| 1411 | slot = 1; |
| 1412 | else |
| 1413 | slot = 0; |
| 1414 | |
| 1415 | element.piece = tp; |
| 1416 | insert_into_type_stack (slot, element); |
| 1417 | } |
| 1418 | |
| 1419 | void |
| 1420 | push_type (enum type_pieces tp) |
| 1421 | { |
| 1422 | check_type_stack_depth (); |
| 1423 | type_stack.elements[type_stack.depth++].piece = tp; |
| 1424 | } |
| 1425 | |
| 1426 | void |
| 1427 | push_type_int (int n) |
| 1428 | { |
| 1429 | check_type_stack_depth (); |
| 1430 | type_stack.elements[type_stack.depth++].int_val = n; |
| 1431 | } |
| 1432 | |
| 1433 | /* Insert a tp_space_identifier and the corresponding address space |
| 1434 | value into the stack. STRING is the name of an address space, as |
| 1435 | recognized by address_space_name_to_int. If the stack is empty, |
| 1436 | the new elements are simply pushed. If the stack is not empty, |
| 1437 | this function assumes that the first item on the stack is a |
| 1438 | tp_pointer, and the new values are inserted above the first |
| 1439 | item. */ |
| 1440 | |
| 1441 | void |
| 1442 | insert_type_address_space (struct parser_state *pstate, char *string) |
| 1443 | { |
| 1444 | union type_stack_elt element; |
| 1445 | int slot; |
| 1446 | |
| 1447 | /* If there is anything on the stack (we know it will be a |
| 1448 | tp_pointer), insert the address space qualifier above it. |
| 1449 | Otherwise, simply push this on the top of the stack. */ |
| 1450 | if (type_stack.depth) |
| 1451 | slot = 1; |
| 1452 | else |
| 1453 | slot = 0; |
| 1454 | |
| 1455 | element.piece = tp_space_identifier; |
| 1456 | insert_into_type_stack (slot, element); |
| 1457 | element.int_val = address_space_name_to_int (parse_gdbarch (pstate), |
| 1458 | string); |
| 1459 | insert_into_type_stack (slot, element); |
| 1460 | } |
| 1461 | |
| 1462 | enum type_pieces |
| 1463 | pop_type (void) |
| 1464 | { |
| 1465 | if (type_stack.depth) |
| 1466 | return type_stack.elements[--type_stack.depth].piece; |
| 1467 | return tp_end; |
| 1468 | } |
| 1469 | |
| 1470 | int |
| 1471 | pop_type_int (void) |
| 1472 | { |
| 1473 | if (type_stack.depth) |
| 1474 | return type_stack.elements[--type_stack.depth].int_val; |
| 1475 | /* "Can't happen". */ |
| 1476 | return 0; |
| 1477 | } |
| 1478 | |
| 1479 | /* Pop a type list element from the global type stack. */ |
| 1480 | |
| 1481 | static VEC (type_ptr) * |
| 1482 | pop_typelist (void) |
| 1483 | { |
| 1484 | gdb_assert (type_stack.depth); |
| 1485 | return type_stack.elements[--type_stack.depth].typelist_val; |
| 1486 | } |
| 1487 | |
| 1488 | /* Pop a type_stack element from the global type stack. */ |
| 1489 | |
| 1490 | static struct type_stack * |
| 1491 | pop_type_stack (void) |
| 1492 | { |
| 1493 | gdb_assert (type_stack.depth); |
| 1494 | return type_stack.elements[--type_stack.depth].stack_val; |
| 1495 | } |
| 1496 | |
| 1497 | /* Append the elements of the type stack FROM to the type stack TO. |
| 1498 | Always returns TO. */ |
| 1499 | |
| 1500 | struct type_stack * |
| 1501 | append_type_stack (struct type_stack *to, struct type_stack *from) |
| 1502 | { |
| 1503 | type_stack_reserve (to, from->depth); |
| 1504 | |
| 1505 | memcpy (&to->elements[to->depth], &from->elements[0], |
| 1506 | from->depth * sizeof (union type_stack_elt)); |
| 1507 | to->depth += from->depth; |
| 1508 | |
| 1509 | return to; |
| 1510 | } |
| 1511 | |
| 1512 | /* Push the type stack STACK as an element on the global type stack. */ |
| 1513 | |
| 1514 | void |
| 1515 | push_type_stack (struct type_stack *stack) |
| 1516 | { |
| 1517 | check_type_stack_depth (); |
| 1518 | type_stack.elements[type_stack.depth++].stack_val = stack; |
| 1519 | push_type (tp_type_stack); |
| 1520 | } |
| 1521 | |
| 1522 | /* Copy the global type stack into a newly allocated type stack and |
| 1523 | return it. The global stack is cleared. The returned type stack |
| 1524 | must be freed with type_stack_cleanup. */ |
| 1525 | |
| 1526 | struct type_stack * |
| 1527 | get_type_stack (void) |
| 1528 | { |
| 1529 | struct type_stack *result = XNEW (struct type_stack); |
| 1530 | |
| 1531 | *result = type_stack; |
| 1532 | type_stack.depth = 0; |
| 1533 | type_stack.size = 0; |
| 1534 | type_stack.elements = NULL; |
| 1535 | |
| 1536 | return result; |
| 1537 | } |
| 1538 | |
| 1539 | /* A cleanup function that destroys a single type stack. */ |
| 1540 | |
| 1541 | void |
| 1542 | type_stack_cleanup (void *arg) |
| 1543 | { |
| 1544 | struct type_stack *stack = (struct type_stack *) arg; |
| 1545 | |
| 1546 | xfree (stack->elements); |
| 1547 | xfree (stack); |
| 1548 | } |
| 1549 | |
| 1550 | /* Push a function type with arguments onto the global type stack. |
| 1551 | LIST holds the argument types. If the final item in LIST is NULL, |
| 1552 | then the function will be varargs. */ |
| 1553 | |
| 1554 | void |
| 1555 | push_typelist (VEC (type_ptr) *list) |
| 1556 | { |
| 1557 | check_type_stack_depth (); |
| 1558 | type_stack.elements[type_stack.depth++].typelist_val = list; |
| 1559 | push_type (tp_function_with_arguments); |
| 1560 | } |
| 1561 | |
| 1562 | /* Pop the type stack and return a type_instance_flags that |
| 1563 | corresponds the const/volatile qualifiers on the stack. This is |
| 1564 | called by the C++ parser when parsing methods types, and as such no |
| 1565 | other kind of type in the type stack is expected. */ |
| 1566 | |
| 1567 | type_instance_flags |
| 1568 | follow_type_instance_flags () |
| 1569 | { |
| 1570 | type_instance_flags flags = 0; |
| 1571 | |
| 1572 | for (;;) |
| 1573 | switch (pop_type ()) |
| 1574 | { |
| 1575 | case tp_end: |
| 1576 | return flags; |
| 1577 | case tp_const: |
| 1578 | flags |= TYPE_INSTANCE_FLAG_CONST; |
| 1579 | break; |
| 1580 | case tp_volatile: |
| 1581 | flags |= TYPE_INSTANCE_FLAG_VOLATILE; |
| 1582 | break; |
| 1583 | default: |
| 1584 | gdb_assert_not_reached ("unrecognized tp_ value in follow_types"); |
| 1585 | } |
| 1586 | } |
| 1587 | |
| 1588 | |
| 1589 | /* Pop the type stack and return the type which corresponds to FOLLOW_TYPE |
| 1590 | as modified by all the stuff on the stack. */ |
| 1591 | struct type * |
| 1592 | follow_types (struct type *follow_type) |
| 1593 | { |
| 1594 | int done = 0; |
| 1595 | int make_const = 0; |
| 1596 | int make_volatile = 0; |
| 1597 | int make_addr_space = 0; |
| 1598 | int array_size; |
| 1599 | |
| 1600 | while (!done) |
| 1601 | switch (pop_type ()) |
| 1602 | { |
| 1603 | case tp_end: |
| 1604 | done = 1; |
| 1605 | if (make_const) |
| 1606 | follow_type = make_cv_type (make_const, |
| 1607 | TYPE_VOLATILE (follow_type), |
| 1608 | follow_type, 0); |
| 1609 | if (make_volatile) |
| 1610 | follow_type = make_cv_type (TYPE_CONST (follow_type), |
| 1611 | make_volatile, |
| 1612 | follow_type, 0); |
| 1613 | if (make_addr_space) |
| 1614 | follow_type = make_type_with_address_space (follow_type, |
| 1615 | make_addr_space); |
| 1616 | make_const = make_volatile = 0; |
| 1617 | make_addr_space = 0; |
| 1618 | break; |
| 1619 | case tp_const: |
| 1620 | make_const = 1; |
| 1621 | break; |
| 1622 | case tp_volatile: |
| 1623 | make_volatile = 1; |
| 1624 | break; |
| 1625 | case tp_space_identifier: |
| 1626 | make_addr_space = pop_type_int (); |
| 1627 | break; |
| 1628 | case tp_pointer: |
| 1629 | follow_type = lookup_pointer_type (follow_type); |
| 1630 | if (make_const) |
| 1631 | follow_type = make_cv_type (make_const, |
| 1632 | TYPE_VOLATILE (follow_type), |
| 1633 | follow_type, 0); |
| 1634 | if (make_volatile) |
| 1635 | follow_type = make_cv_type (TYPE_CONST (follow_type), |
| 1636 | make_volatile, |
| 1637 | follow_type, 0); |
| 1638 | if (make_addr_space) |
| 1639 | follow_type = make_type_with_address_space (follow_type, |
| 1640 | make_addr_space); |
| 1641 | make_const = make_volatile = 0; |
| 1642 | make_addr_space = 0; |
| 1643 | break; |
| 1644 | case tp_reference: |
| 1645 | follow_type = lookup_lvalue_reference_type (follow_type); |
| 1646 | goto process_reference; |
| 1647 | case tp_rvalue_reference: |
| 1648 | follow_type = lookup_rvalue_reference_type (follow_type); |
| 1649 | process_reference: |
| 1650 | if (make_const) |
| 1651 | follow_type = make_cv_type (make_const, |
| 1652 | TYPE_VOLATILE (follow_type), |
| 1653 | follow_type, 0); |
| 1654 | if (make_volatile) |
| 1655 | follow_type = make_cv_type (TYPE_CONST (follow_type), |
| 1656 | make_volatile, |
| 1657 | follow_type, 0); |
| 1658 | if (make_addr_space) |
| 1659 | follow_type = make_type_with_address_space (follow_type, |
| 1660 | make_addr_space); |
| 1661 | make_const = make_volatile = 0; |
| 1662 | make_addr_space = 0; |
| 1663 | break; |
| 1664 | case tp_array: |
| 1665 | array_size = pop_type_int (); |
| 1666 | /* FIXME-type-allocation: need a way to free this type when we are |
| 1667 | done with it. */ |
| 1668 | follow_type = |
| 1669 | lookup_array_range_type (follow_type, |
| 1670 | 0, array_size >= 0 ? array_size - 1 : 0); |
| 1671 | if (array_size < 0) |
| 1672 | TYPE_HIGH_BOUND_KIND (TYPE_INDEX_TYPE (follow_type)) |
| 1673 | = PROP_UNDEFINED; |
| 1674 | break; |
| 1675 | case tp_function: |
| 1676 | /* FIXME-type-allocation: need a way to free this type when we are |
| 1677 | done with it. */ |
| 1678 | follow_type = lookup_function_type (follow_type); |
| 1679 | break; |
| 1680 | |
| 1681 | case tp_function_with_arguments: |
| 1682 | { |
| 1683 | VEC (type_ptr) *args = pop_typelist (); |
| 1684 | |
| 1685 | follow_type |
| 1686 | = lookup_function_type_with_arguments (follow_type, |
| 1687 | VEC_length (type_ptr, args), |
| 1688 | VEC_address (type_ptr, |
| 1689 | args)); |
| 1690 | VEC_free (type_ptr, args); |
| 1691 | } |
| 1692 | break; |
| 1693 | |
| 1694 | case tp_type_stack: |
| 1695 | { |
| 1696 | struct type_stack *stack = pop_type_stack (); |
| 1697 | /* Sort of ugly, but not really much worse than the |
| 1698 | alternatives. */ |
| 1699 | struct type_stack save = type_stack; |
| 1700 | |
| 1701 | type_stack = *stack; |
| 1702 | follow_type = follow_types (follow_type); |
| 1703 | gdb_assert (type_stack.depth == 0); |
| 1704 | |
| 1705 | type_stack = save; |
| 1706 | } |
| 1707 | break; |
| 1708 | default: |
| 1709 | gdb_assert_not_reached ("unrecognized tp_ value in follow_types"); |
| 1710 | } |
| 1711 | return follow_type; |
| 1712 | } |
| 1713 | \f |
| 1714 | /* This function avoids direct calls to fprintf |
| 1715 | in the parser generated debug code. */ |
| 1716 | void |
| 1717 | parser_fprintf (FILE *x, const char *y, ...) |
| 1718 | { |
| 1719 | va_list args; |
| 1720 | |
| 1721 | va_start (args, y); |
| 1722 | if (x == stderr) |
| 1723 | vfprintf_unfiltered (gdb_stderr, y, args); |
| 1724 | else |
| 1725 | { |
| 1726 | fprintf_unfiltered (gdb_stderr, " Unknown FILE used.\n"); |
| 1727 | vfprintf_unfiltered (gdb_stderr, y, args); |
| 1728 | } |
| 1729 | va_end (args); |
| 1730 | } |
| 1731 | |
| 1732 | /* Implementation of the exp_descriptor method operator_check. */ |
| 1733 | |
| 1734 | int |
| 1735 | operator_check_standard (struct expression *exp, int pos, |
| 1736 | int (*objfile_func) (struct objfile *objfile, |
| 1737 | void *data), |
| 1738 | void *data) |
| 1739 | { |
| 1740 | const union exp_element *const elts = exp->elts; |
| 1741 | struct type *type = NULL; |
| 1742 | struct objfile *objfile = NULL; |
| 1743 | |
| 1744 | /* Extended operators should have been already handled by exp_descriptor |
| 1745 | iterate method of its specific language. */ |
| 1746 | gdb_assert (elts[pos].opcode < OP_EXTENDED0); |
| 1747 | |
| 1748 | /* Track the callers of write_exp_elt_type for this table. */ |
| 1749 | |
| 1750 | switch (elts[pos].opcode) |
| 1751 | { |
| 1752 | case BINOP_VAL: |
| 1753 | case OP_COMPLEX: |
| 1754 | case OP_FLOAT: |
| 1755 | case OP_LONG: |
| 1756 | case OP_SCOPE: |
| 1757 | case OP_TYPE: |
| 1758 | case UNOP_CAST: |
| 1759 | case UNOP_MAX: |
| 1760 | case UNOP_MEMVAL: |
| 1761 | case UNOP_MIN: |
| 1762 | type = elts[pos + 1].type; |
| 1763 | break; |
| 1764 | |
| 1765 | case TYPE_INSTANCE: |
| 1766 | { |
| 1767 | LONGEST arg, nargs = elts[pos + 2].longconst; |
| 1768 | |
| 1769 | for (arg = 0; arg < nargs; arg++) |
| 1770 | { |
| 1771 | struct type *type = elts[pos + 3 + arg].type; |
| 1772 | struct objfile *objfile = TYPE_OBJFILE (type); |
| 1773 | |
| 1774 | if (objfile && (*objfile_func) (objfile, data)) |
| 1775 | return 1; |
| 1776 | } |
| 1777 | } |
| 1778 | break; |
| 1779 | |
| 1780 | case OP_VAR_VALUE: |
| 1781 | { |
| 1782 | const struct block *const block = elts[pos + 1].block; |
| 1783 | const struct symbol *const symbol = elts[pos + 2].symbol; |
| 1784 | |
| 1785 | /* Check objfile where the variable itself is placed. |
| 1786 | SYMBOL_OBJ_SECTION (symbol) may be NULL. */ |
| 1787 | if ((*objfile_func) (symbol_objfile (symbol), data)) |
| 1788 | return 1; |
| 1789 | |
| 1790 | /* Check objfile where is placed the code touching the variable. */ |
| 1791 | objfile = lookup_objfile_from_block (block); |
| 1792 | |
| 1793 | type = SYMBOL_TYPE (symbol); |
| 1794 | } |
| 1795 | break; |
| 1796 | case OP_VAR_MSYM_VALUE: |
| 1797 | objfile = elts[pos + 1].objfile; |
| 1798 | break; |
| 1799 | } |
| 1800 | |
| 1801 | /* Invoke callbacks for TYPE and OBJFILE if they were set as non-NULL. */ |
| 1802 | |
| 1803 | if (type && TYPE_OBJFILE (type) |
| 1804 | && (*objfile_func) (TYPE_OBJFILE (type), data)) |
| 1805 | return 1; |
| 1806 | if (objfile && (*objfile_func) (objfile, data)) |
| 1807 | return 1; |
| 1808 | |
| 1809 | return 0; |
| 1810 | } |
| 1811 | |
| 1812 | /* Call OBJFILE_FUNC for any objfile found being referenced by EXP. |
| 1813 | OBJFILE_FUNC is never called with NULL OBJFILE. OBJFILE_FUNC get |
| 1814 | passed an arbitrary caller supplied DATA pointer. If OBJFILE_FUNC |
| 1815 | returns non-zero value then (any other) non-zero value is immediately |
| 1816 | returned to the caller. Otherwise zero is returned after iterating |
| 1817 | through whole EXP. */ |
| 1818 | |
| 1819 | static int |
| 1820 | exp_iterate (struct expression *exp, |
| 1821 | int (*objfile_func) (struct objfile *objfile, void *data), |
| 1822 | void *data) |
| 1823 | { |
| 1824 | int endpos; |
| 1825 | |
| 1826 | for (endpos = exp->nelts; endpos > 0; ) |
| 1827 | { |
| 1828 | int pos, args, oplen = 0; |
| 1829 | |
| 1830 | operator_length (exp, endpos, &oplen, &args); |
| 1831 | gdb_assert (oplen > 0); |
| 1832 | |
| 1833 | pos = endpos - oplen; |
| 1834 | if (exp->language_defn->la_exp_desc->operator_check (exp, pos, |
| 1835 | objfile_func, data)) |
| 1836 | return 1; |
| 1837 | |
| 1838 | endpos = pos; |
| 1839 | } |
| 1840 | |
| 1841 | return 0; |
| 1842 | } |
| 1843 | |
| 1844 | /* Helper for exp_uses_objfile. */ |
| 1845 | |
| 1846 | static int |
| 1847 | exp_uses_objfile_iter (struct objfile *exp_objfile, void *objfile_voidp) |
| 1848 | { |
| 1849 | struct objfile *objfile = (struct objfile *) objfile_voidp; |
| 1850 | |
| 1851 | if (exp_objfile->separate_debug_objfile_backlink) |
| 1852 | exp_objfile = exp_objfile->separate_debug_objfile_backlink; |
| 1853 | |
| 1854 | return exp_objfile == objfile; |
| 1855 | } |
| 1856 | |
| 1857 | /* Return 1 if EXP uses OBJFILE (and will become dangling when OBJFILE |
| 1858 | is unloaded), otherwise return 0. OBJFILE must not be a separate debug info |
| 1859 | file. */ |
| 1860 | |
| 1861 | int |
| 1862 | exp_uses_objfile (struct expression *exp, struct objfile *objfile) |
| 1863 | { |
| 1864 | gdb_assert (objfile->separate_debug_objfile_backlink == NULL); |
| 1865 | |
| 1866 | return exp_iterate (exp, exp_uses_objfile_iter, objfile); |
| 1867 | } |
| 1868 | |
| 1869 | /* See definition in parser-defs.h. */ |
| 1870 | |
| 1871 | void |
| 1872 | increase_expout_size (struct parser_state *ps, size_t lenelt) |
| 1873 | { |
| 1874 | if ((ps->expout_ptr + lenelt) >= ps->expout_size) |
| 1875 | { |
| 1876 | ps->expout_size = std::max (ps->expout_size * 2, |
| 1877 | ps->expout_ptr + lenelt + 10); |
| 1878 | ps->expout.reset (XRESIZEVAR (expression, |
| 1879 | ps->expout.release (), |
| 1880 | (sizeof (struct expression) |
| 1881 | + EXP_ELEM_TO_BYTES (ps->expout_size)))); |
| 1882 | } |
| 1883 | } |
| 1884 | |
| 1885 | void |
| 1886 | _initialize_parse (void) |
| 1887 | { |
| 1888 | type_stack.size = 0; |
| 1889 | type_stack.depth = 0; |
| 1890 | type_stack.elements = NULL; |
| 1891 | |
| 1892 | add_setshow_zuinteger_cmd ("expression", class_maintenance, |
| 1893 | &expressiondebug, |
| 1894 | _("Set expression debugging."), |
| 1895 | _("Show expression debugging."), |
| 1896 | _("When non-zero, the internal representation " |
| 1897 | "of expressions will be printed."), |
| 1898 | NULL, |
| 1899 | show_expressiondebug, |
| 1900 | &setdebuglist, &showdebuglist); |
| 1901 | add_setshow_boolean_cmd ("parser", class_maintenance, |
| 1902 | &parser_debug, |
| 1903 | _("Set parser debugging."), |
| 1904 | _("Show parser debugging."), |
| 1905 | _("When non-zero, expression parser " |
| 1906 | "tracing will be enabled."), |
| 1907 | NULL, |
| 1908 | show_parserdebug, |
| 1909 | &setdebuglist, &showdebuglist); |
| 1910 | } |