| 1 | /* YACC grammar for Modula-2 expressions, for GDB. |
| 2 | Copyright (C) 1986, 1989, 1990, 1991 Free Software Foundation, Inc. |
| 3 | Generated from expread.y (now c-exp.y) and contributed by the Department |
| 4 | of Computer Science at the State University of New York at Buffalo, 1991. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 21 | |
| 22 | /* Parse a Modula-2 expression from text in a string, |
| 23 | and return the result as a struct expression pointer. |
| 24 | That structure contains arithmetic operations in reverse polish, |
| 25 | with constants represented by operations that are followed by special data. |
| 26 | See expression.h for the details of the format. |
| 27 | What is important here is that it can be built up sequentially |
| 28 | during the process of parsing; the lower levels of the tree always |
| 29 | come first in the result. |
| 30 | |
| 31 | Note that malloc's and realloc's in this file are transformed to |
| 32 | xmalloc and xrealloc respectively by the same sed command in the |
| 33 | makefile that remaps any other malloc/realloc inserted by the parser |
| 34 | generator. Doing this with #defines and trying to control the interaction |
| 35 | with include files (<malloc.h> and <stdlib.h> for example) just became |
| 36 | too messy, particularly when such includes can be inserted at random |
| 37 | times by the parser generator. */ |
| 38 | |
| 39 | %{ |
| 40 | |
| 41 | #include "defs.h" |
| 42 | #include "expression.h" |
| 43 | #include "language.h" |
| 44 | #include "value.h" |
| 45 | #include "parser-defs.h" |
| 46 | #include "m2-lang.h" |
| 47 | |
| 48 | /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc), |
| 49 | as well as gratuitiously global symbol names, so we can have multiple |
| 50 | yacc generated parsers in gdb. Note that these are only the variables |
| 51 | produced by yacc. If other parser generators (bison, byacc, etc) produce |
| 52 | additional global names that conflict at link time, then those parser |
| 53 | generators need to be fixed instead of adding those names to this list. */ |
| 54 | |
| 55 | #define yymaxdepth m2_maxdepth |
| 56 | #define yyparse m2_parse |
| 57 | #define yylex m2_lex |
| 58 | #define yyerror m2_error |
| 59 | #define yylval m2_lval |
| 60 | #define yychar m2_char |
| 61 | #define yydebug m2_debug |
| 62 | #define yypact m2_pact |
| 63 | #define yyr1 m2_r1 |
| 64 | #define yyr2 m2_r2 |
| 65 | #define yydef m2_def |
| 66 | #define yychk m2_chk |
| 67 | #define yypgo m2_pgo |
| 68 | #define yyact m2_act |
| 69 | #define yyexca m2_exca |
| 70 | #define yyerrflag m2_errflag |
| 71 | #define yynerrs m2_nerrs |
| 72 | #define yyps m2_ps |
| 73 | #define yypv m2_pv |
| 74 | #define yys m2_s |
| 75 | #define yy_yys m2_yys |
| 76 | #define yystate m2_state |
| 77 | #define yytmp m2_tmp |
| 78 | #define yyv m2_v |
| 79 | #define yy_yyv m2_yyv |
| 80 | #define yyval m2_val |
| 81 | #define yylloc m2_lloc |
| 82 | #define yyreds m2_reds /* With YYDEBUG defined */ |
| 83 | #define yytoks m2_toks /* With YYDEBUG defined */ |
| 84 | |
| 85 | #ifndef YYDEBUG |
| 86 | #define YYDEBUG 0 /* Default to no yydebug support */ |
| 87 | #endif |
| 88 | |
| 89 | int |
| 90 | yyparse PARAMS ((void)); |
| 91 | |
| 92 | static int |
| 93 | yylex PARAMS ((void)); |
| 94 | |
| 95 | void |
| 96 | yyerror PARAMS ((char *)); |
| 97 | |
| 98 | #if 0 |
| 99 | static char * |
| 100 | make_qualname PARAMS ((char *, char *)); |
| 101 | #endif |
| 102 | |
| 103 | static int |
| 104 | parse_number PARAMS ((int)); |
| 105 | |
| 106 | /* The sign of the number being parsed. */ |
| 107 | static int number_sign = 1; |
| 108 | |
| 109 | /* The block that the module specified by the qualifer on an identifer is |
| 110 | contained in, */ |
| 111 | #if 0 |
| 112 | static struct block *modblock=0; |
| 113 | #endif |
| 114 | |
| 115 | %} |
| 116 | |
| 117 | /* Although the yacc "value" of an expression is not used, |
| 118 | since the result is stored in the structure being created, |
| 119 | other node types do have values. */ |
| 120 | |
| 121 | %union |
| 122 | { |
| 123 | LONGEST lval; |
| 124 | unsigned LONGEST ulval; |
| 125 | double dval; |
| 126 | struct symbol *sym; |
| 127 | struct type *tval; |
| 128 | struct stoken sval; |
| 129 | int voidval; |
| 130 | struct block *bval; |
| 131 | enum exp_opcode opcode; |
| 132 | struct internalvar *ivar; |
| 133 | |
| 134 | struct type **tvec; |
| 135 | int *ivec; |
| 136 | } |
| 137 | |
| 138 | %type <voidval> exp type_exp start set |
| 139 | %type <voidval> variable |
| 140 | %type <tval> type |
| 141 | %type <bval> block |
| 142 | %type <sym> fblock |
| 143 | |
| 144 | %token <lval> INT HEX ERROR |
| 145 | %token <ulval> UINT M2_TRUE M2_FALSE CHAR |
| 146 | %token <dval> FLOAT |
| 147 | |
| 148 | /* Both NAME and TYPENAME tokens represent symbols in the input, |
| 149 | and both convey their data as strings. |
| 150 | But a TYPENAME is a string that happens to be defined as a typedef |
| 151 | or builtin type name (such as int or char) |
| 152 | and a NAME is any other symbol. |
| 153 | |
| 154 | Contexts where this distinction is not important can use the |
| 155 | nonterminal "name", which matches either NAME or TYPENAME. */ |
| 156 | |
| 157 | %token <sval> STRING |
| 158 | %token <sval> NAME BLOCKNAME IDENT VARNAME |
| 159 | %token <sval> TYPENAME |
| 160 | |
| 161 | %token SIZE CAP ORD HIGH ABS MIN_FUNC MAX_FUNC FLOAT_FUNC VAL CHR ODD TRUNC |
| 162 | %token INC DEC INCL EXCL |
| 163 | |
| 164 | /* The GDB scope operator */ |
| 165 | %token COLONCOLON |
| 166 | |
| 167 | %token <lval> LAST REGNAME |
| 168 | |
| 169 | %token <ivar> INTERNAL_VAR |
| 170 | |
| 171 | /* M2 tokens */ |
| 172 | %left ',' |
| 173 | %left ABOVE_COMMA |
| 174 | %nonassoc ASSIGN |
| 175 | %left '<' '>' LEQ GEQ '=' NOTEQUAL '#' IN |
| 176 | %left OROR |
| 177 | %left LOGICAL_AND '&' |
| 178 | %left '@' |
| 179 | %left '+' '-' |
| 180 | %left '*' '/' DIV MOD |
| 181 | %right UNARY |
| 182 | %right '^' DOT '[' '(' |
| 183 | %right NOT '~' |
| 184 | %left COLONCOLON QID |
| 185 | /* This is not an actual token ; it is used for precedence. |
| 186 | %right QID |
| 187 | */ |
| 188 | |
| 189 | \f |
| 190 | %% |
| 191 | |
| 192 | start : exp |
| 193 | | type_exp |
| 194 | ; |
| 195 | |
| 196 | type_exp: type |
| 197 | { write_exp_elt_opcode(OP_TYPE); |
| 198 | write_exp_elt_type($1); |
| 199 | write_exp_elt_opcode(OP_TYPE); |
| 200 | } |
| 201 | ; |
| 202 | |
| 203 | /* Expressions */ |
| 204 | |
| 205 | exp : exp '^' %prec UNARY |
| 206 | { write_exp_elt_opcode (UNOP_IND); } |
| 207 | |
| 208 | exp : '-' |
| 209 | { number_sign = -1; } |
| 210 | exp %prec UNARY |
| 211 | { number_sign = 1; |
| 212 | write_exp_elt_opcode (UNOP_NEG); } |
| 213 | ; |
| 214 | |
| 215 | exp : '+' exp %prec UNARY |
| 216 | { write_exp_elt_opcode(UNOP_PLUS); } |
| 217 | ; |
| 218 | |
| 219 | exp : not_exp exp %prec UNARY |
| 220 | { write_exp_elt_opcode (UNOP_LOGICAL_NOT); } |
| 221 | ; |
| 222 | |
| 223 | not_exp : NOT |
| 224 | | '~' |
| 225 | ; |
| 226 | |
| 227 | exp : CAP '(' exp ')' |
| 228 | { write_exp_elt_opcode (UNOP_CAP); } |
| 229 | ; |
| 230 | |
| 231 | exp : ORD '(' exp ')' |
| 232 | { write_exp_elt_opcode (UNOP_ORD); } |
| 233 | ; |
| 234 | |
| 235 | exp : ABS '(' exp ')' |
| 236 | { write_exp_elt_opcode (UNOP_ABS); } |
| 237 | ; |
| 238 | |
| 239 | exp : HIGH '(' exp ')' |
| 240 | { write_exp_elt_opcode (UNOP_HIGH); } |
| 241 | ; |
| 242 | |
| 243 | exp : MIN_FUNC '(' type ')' |
| 244 | { write_exp_elt_opcode (UNOP_MIN); |
| 245 | write_exp_elt_type ($3); |
| 246 | write_exp_elt_opcode (UNOP_MIN); } |
| 247 | ; |
| 248 | |
| 249 | exp : MAX_FUNC '(' type ')' |
| 250 | { write_exp_elt_opcode (UNOP_MAX); |
| 251 | write_exp_elt_type ($3); |
| 252 | write_exp_elt_opcode (UNOP_MIN); } |
| 253 | ; |
| 254 | |
| 255 | exp : FLOAT_FUNC '(' exp ')' |
| 256 | { write_exp_elt_opcode (UNOP_FLOAT); } |
| 257 | ; |
| 258 | |
| 259 | exp : VAL '(' type ',' exp ')' |
| 260 | { write_exp_elt_opcode (BINOP_VAL); |
| 261 | write_exp_elt_type ($3); |
| 262 | write_exp_elt_opcode (BINOP_VAL); } |
| 263 | ; |
| 264 | |
| 265 | exp : CHR '(' exp ')' |
| 266 | { write_exp_elt_opcode (UNOP_CHR); } |
| 267 | ; |
| 268 | |
| 269 | exp : ODD '(' exp ')' |
| 270 | { write_exp_elt_opcode (UNOP_ODD); } |
| 271 | ; |
| 272 | |
| 273 | exp : TRUNC '(' exp ')' |
| 274 | { write_exp_elt_opcode (UNOP_TRUNC); } |
| 275 | ; |
| 276 | |
| 277 | exp : SIZE exp %prec UNARY |
| 278 | { write_exp_elt_opcode (UNOP_SIZEOF); } |
| 279 | ; |
| 280 | |
| 281 | |
| 282 | exp : INC '(' exp ')' |
| 283 | { write_exp_elt_opcode(UNOP_PREINCREMENT); } |
| 284 | ; |
| 285 | |
| 286 | exp : INC '(' exp ',' exp ')' |
| 287 | { write_exp_elt_opcode(BINOP_ASSIGN_MODIFY); |
| 288 | write_exp_elt_opcode(BINOP_ADD); |
| 289 | write_exp_elt_opcode(BINOP_ASSIGN_MODIFY); } |
| 290 | ; |
| 291 | |
| 292 | exp : DEC '(' exp ')' |
| 293 | { write_exp_elt_opcode(UNOP_PREDECREMENT);} |
| 294 | ; |
| 295 | |
| 296 | exp : DEC '(' exp ',' exp ')' |
| 297 | { write_exp_elt_opcode(BINOP_ASSIGN_MODIFY); |
| 298 | write_exp_elt_opcode(BINOP_SUB); |
| 299 | write_exp_elt_opcode(BINOP_ASSIGN_MODIFY); } |
| 300 | ; |
| 301 | |
| 302 | exp : exp DOT NAME |
| 303 | { write_exp_elt_opcode (STRUCTOP_STRUCT); |
| 304 | write_exp_string ($3); |
| 305 | write_exp_elt_opcode (STRUCTOP_STRUCT); } |
| 306 | ; |
| 307 | |
| 308 | exp : set |
| 309 | ; |
| 310 | |
| 311 | exp : exp IN set |
| 312 | { error("Sets are not implemented.");} |
| 313 | ; |
| 314 | |
| 315 | exp : INCL '(' exp ',' exp ')' |
| 316 | { error("Sets are not implemented.");} |
| 317 | ; |
| 318 | |
| 319 | exp : EXCL '(' exp ',' exp ')' |
| 320 | { error("Sets are not implemented.");} |
| 321 | |
| 322 | set : '{' arglist '}' |
| 323 | { error("Sets are not implemented.");} |
| 324 | | type '{' arglist '}' |
| 325 | { error("Sets are not implemented.");} |
| 326 | ; |
| 327 | |
| 328 | |
| 329 | /* Modula-2 array subscript notation [a,b,c...] */ |
| 330 | exp : exp '[' |
| 331 | /* This function just saves the number of arguments |
| 332 | that follow in the list. It is *not* specific to |
| 333 | function types */ |
| 334 | { start_arglist(); } |
| 335 | non_empty_arglist ']' %prec DOT |
| 336 | { write_exp_elt_opcode (MULTI_SUBSCRIPT); |
| 337 | write_exp_elt_longcst ((LONGEST) end_arglist()); |
| 338 | write_exp_elt_opcode (MULTI_SUBSCRIPT); } |
| 339 | ; |
| 340 | |
| 341 | exp : exp '(' |
| 342 | /* This is to save the value of arglist_len |
| 343 | being accumulated by an outer function call. */ |
| 344 | { start_arglist (); } |
| 345 | arglist ')' %prec DOT |
| 346 | { write_exp_elt_opcode (OP_FUNCALL); |
| 347 | write_exp_elt_longcst ((LONGEST) end_arglist ()); |
| 348 | write_exp_elt_opcode (OP_FUNCALL); } |
| 349 | ; |
| 350 | |
| 351 | arglist : |
| 352 | ; |
| 353 | |
| 354 | arglist : exp |
| 355 | { arglist_len = 1; } |
| 356 | ; |
| 357 | |
| 358 | arglist : arglist ',' exp %prec ABOVE_COMMA |
| 359 | { arglist_len++; } |
| 360 | ; |
| 361 | |
| 362 | non_empty_arglist |
| 363 | : exp |
| 364 | { arglist_len = 1; } |
| 365 | ; |
| 366 | |
| 367 | non_empty_arglist |
| 368 | : non_empty_arglist ',' exp %prec ABOVE_COMMA |
| 369 | { arglist_len++; } |
| 370 | ; |
| 371 | |
| 372 | /* GDB construct */ |
| 373 | exp : '{' type '}' exp %prec UNARY |
| 374 | { write_exp_elt_opcode (UNOP_MEMVAL); |
| 375 | write_exp_elt_type ($2); |
| 376 | write_exp_elt_opcode (UNOP_MEMVAL); } |
| 377 | ; |
| 378 | |
| 379 | exp : type '(' exp ')' %prec UNARY |
| 380 | { write_exp_elt_opcode (UNOP_CAST); |
| 381 | write_exp_elt_type ($1); |
| 382 | write_exp_elt_opcode (UNOP_CAST); } |
| 383 | ; |
| 384 | |
| 385 | exp : '(' exp ')' |
| 386 | { } |
| 387 | ; |
| 388 | |
| 389 | /* Binary operators in order of decreasing precedence. Note that some |
| 390 | of these operators are overloaded! (ie. sets) */ |
| 391 | |
| 392 | /* GDB construct */ |
| 393 | exp : exp '@' exp |
| 394 | { write_exp_elt_opcode (BINOP_REPEAT); } |
| 395 | ; |
| 396 | |
| 397 | exp : exp '*' exp |
| 398 | { write_exp_elt_opcode (BINOP_MUL); } |
| 399 | ; |
| 400 | |
| 401 | exp : exp '/' exp |
| 402 | { write_exp_elt_opcode (BINOP_DIV); } |
| 403 | ; |
| 404 | |
| 405 | exp : exp DIV exp |
| 406 | { write_exp_elt_opcode (BINOP_INTDIV); } |
| 407 | ; |
| 408 | |
| 409 | exp : exp MOD exp |
| 410 | { write_exp_elt_opcode (BINOP_REM); } |
| 411 | ; |
| 412 | |
| 413 | exp : exp '+' exp |
| 414 | { write_exp_elt_opcode (BINOP_ADD); } |
| 415 | ; |
| 416 | |
| 417 | exp : exp '-' exp |
| 418 | { write_exp_elt_opcode (BINOP_SUB); } |
| 419 | ; |
| 420 | |
| 421 | exp : exp '=' exp |
| 422 | { write_exp_elt_opcode (BINOP_EQUAL); } |
| 423 | ; |
| 424 | |
| 425 | exp : exp NOTEQUAL exp |
| 426 | { write_exp_elt_opcode (BINOP_NOTEQUAL); } |
| 427 | | exp '#' exp |
| 428 | { write_exp_elt_opcode (BINOP_NOTEQUAL); } |
| 429 | ; |
| 430 | |
| 431 | exp : exp LEQ exp |
| 432 | { write_exp_elt_opcode (BINOP_LEQ); } |
| 433 | ; |
| 434 | |
| 435 | exp : exp GEQ exp |
| 436 | { write_exp_elt_opcode (BINOP_GEQ); } |
| 437 | ; |
| 438 | |
| 439 | exp : exp '<' exp |
| 440 | { write_exp_elt_opcode (BINOP_LESS); } |
| 441 | ; |
| 442 | |
| 443 | exp : exp '>' exp |
| 444 | { write_exp_elt_opcode (BINOP_GTR); } |
| 445 | ; |
| 446 | |
| 447 | exp : exp LOGICAL_AND exp |
| 448 | { write_exp_elt_opcode (BINOP_LOGICAL_AND); } |
| 449 | ; |
| 450 | |
| 451 | exp : exp OROR exp |
| 452 | { write_exp_elt_opcode (BINOP_LOGICAL_OR); } |
| 453 | ; |
| 454 | |
| 455 | exp : exp ASSIGN exp |
| 456 | { write_exp_elt_opcode (BINOP_ASSIGN); } |
| 457 | ; |
| 458 | |
| 459 | |
| 460 | /* Constants */ |
| 461 | |
| 462 | exp : M2_TRUE |
| 463 | { write_exp_elt_opcode (OP_BOOL); |
| 464 | write_exp_elt_longcst ((LONGEST) $1); |
| 465 | write_exp_elt_opcode (OP_BOOL); } |
| 466 | ; |
| 467 | |
| 468 | exp : M2_FALSE |
| 469 | { write_exp_elt_opcode (OP_BOOL); |
| 470 | write_exp_elt_longcst ((LONGEST) $1); |
| 471 | write_exp_elt_opcode (OP_BOOL); } |
| 472 | ; |
| 473 | |
| 474 | exp : INT |
| 475 | { write_exp_elt_opcode (OP_LONG); |
| 476 | write_exp_elt_type (builtin_type_m2_int); |
| 477 | write_exp_elt_longcst ((LONGEST) $1); |
| 478 | write_exp_elt_opcode (OP_LONG); } |
| 479 | ; |
| 480 | |
| 481 | exp : UINT |
| 482 | { |
| 483 | write_exp_elt_opcode (OP_LONG); |
| 484 | write_exp_elt_type (builtin_type_m2_card); |
| 485 | write_exp_elt_longcst ((LONGEST) $1); |
| 486 | write_exp_elt_opcode (OP_LONG); |
| 487 | } |
| 488 | ; |
| 489 | |
| 490 | exp : CHAR |
| 491 | { write_exp_elt_opcode (OP_LONG); |
| 492 | write_exp_elt_type (builtin_type_m2_char); |
| 493 | write_exp_elt_longcst ((LONGEST) $1); |
| 494 | write_exp_elt_opcode (OP_LONG); } |
| 495 | ; |
| 496 | |
| 497 | |
| 498 | exp : FLOAT |
| 499 | { write_exp_elt_opcode (OP_DOUBLE); |
| 500 | write_exp_elt_type (builtin_type_m2_real); |
| 501 | write_exp_elt_dblcst ($1); |
| 502 | write_exp_elt_opcode (OP_DOUBLE); } |
| 503 | ; |
| 504 | |
| 505 | exp : variable |
| 506 | ; |
| 507 | |
| 508 | /* The GDB internal variable $$, et al. */ |
| 509 | exp : LAST |
| 510 | { write_exp_elt_opcode (OP_LAST); |
| 511 | write_exp_elt_longcst ((LONGEST) $1); |
| 512 | write_exp_elt_opcode (OP_LAST); } |
| 513 | ; |
| 514 | |
| 515 | exp : REGNAME |
| 516 | { write_exp_elt_opcode (OP_REGISTER); |
| 517 | write_exp_elt_longcst ((LONGEST) $1); |
| 518 | write_exp_elt_opcode (OP_REGISTER); } |
| 519 | ; |
| 520 | |
| 521 | exp : SIZE '(' type ')' %prec UNARY |
| 522 | { write_exp_elt_opcode (OP_LONG); |
| 523 | write_exp_elt_type (builtin_type_int); |
| 524 | write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3)); |
| 525 | write_exp_elt_opcode (OP_LONG); } |
| 526 | ; |
| 527 | |
| 528 | exp : STRING |
| 529 | { write_exp_elt_opcode (OP_M2_STRING); |
| 530 | write_exp_string ($1); |
| 531 | write_exp_elt_opcode (OP_M2_STRING); } |
| 532 | ; |
| 533 | |
| 534 | /* This will be used for extensions later. Like adding modules. */ |
| 535 | block : fblock |
| 536 | { $$ = SYMBOL_BLOCK_VALUE($1); } |
| 537 | ; |
| 538 | |
| 539 | fblock : BLOCKNAME |
| 540 | { struct symbol *sym |
| 541 | = lookup_symbol (copy_name ($1), expression_context_block, |
| 542 | VAR_NAMESPACE, 0, NULL); |
| 543 | $$ = sym;} |
| 544 | ; |
| 545 | |
| 546 | |
| 547 | /* GDB scope operator */ |
| 548 | fblock : block COLONCOLON BLOCKNAME |
| 549 | { struct symbol *tem |
| 550 | = lookup_symbol (copy_name ($3), $1, |
| 551 | VAR_NAMESPACE, 0, NULL); |
| 552 | if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK) |
| 553 | error ("No function \"%s\" in specified context.", |
| 554 | copy_name ($3)); |
| 555 | $$ = tem; |
| 556 | } |
| 557 | ; |
| 558 | |
| 559 | /* Useful for assigning to PROCEDURE variables */ |
| 560 | variable: fblock |
| 561 | { write_exp_elt_opcode(OP_VAR_VALUE); |
| 562 | write_exp_elt_sym ($1); |
| 563 | write_exp_elt_opcode (OP_VAR_VALUE); } |
| 564 | ; |
| 565 | |
| 566 | /* GDB internal ($foo) variable */ |
| 567 | variable: INTERNAL_VAR |
| 568 | { write_exp_elt_opcode (OP_INTERNALVAR); |
| 569 | write_exp_elt_intern ($1); |
| 570 | write_exp_elt_opcode (OP_INTERNALVAR); } |
| 571 | ; |
| 572 | |
| 573 | /* GDB scope operator */ |
| 574 | variable: block COLONCOLON NAME |
| 575 | { struct symbol *sym; |
| 576 | sym = lookup_symbol (copy_name ($3), $1, |
| 577 | VAR_NAMESPACE, 0, NULL); |
| 578 | if (sym == 0) |
| 579 | error ("No symbol \"%s\" in specified context.", |
| 580 | copy_name ($3)); |
| 581 | |
| 582 | write_exp_elt_opcode (OP_VAR_VALUE); |
| 583 | write_exp_elt_sym (sym); |
| 584 | write_exp_elt_opcode (OP_VAR_VALUE); } |
| 585 | ; |
| 586 | |
| 587 | /* Base case for variables. */ |
| 588 | variable: NAME |
| 589 | { struct symbol *sym; |
| 590 | int is_a_field_of_this; |
| 591 | |
| 592 | sym = lookup_symbol (copy_name ($1), |
| 593 | expression_context_block, |
| 594 | VAR_NAMESPACE, |
| 595 | &is_a_field_of_this, |
| 596 | NULL); |
| 597 | if (sym) |
| 598 | { |
| 599 | switch (sym->class) |
| 600 | { |
| 601 | case LOC_REGISTER: |
| 602 | case LOC_ARG: |
| 603 | case LOC_LOCAL: |
| 604 | case LOC_REF_ARG: |
| 605 | case LOC_REGPARM: |
| 606 | case LOC_LOCAL_ARG: |
| 607 | if (innermost_block == 0 || |
| 608 | contained_in (block_found, |
| 609 | innermost_block)) |
| 610 | innermost_block = block_found; |
| 611 | break; |
| 612 | |
| 613 | case LOC_UNDEF: |
| 614 | case LOC_CONST: |
| 615 | case LOC_STATIC: |
| 616 | case LOC_TYPEDEF: |
| 617 | case LOC_LABEL: /* maybe should go above? */ |
| 618 | case LOC_BLOCK: |
| 619 | case LOC_CONST_BYTES: |
| 620 | /* These are listed so gcc -Wall will reveal |
| 621 | un-handled cases. */ |
| 622 | break; |
| 623 | } |
| 624 | write_exp_elt_opcode (OP_VAR_VALUE); |
| 625 | write_exp_elt_sym (sym); |
| 626 | write_exp_elt_opcode (OP_VAR_VALUE); |
| 627 | } |
| 628 | else |
| 629 | { |
| 630 | struct minimal_symbol *msymbol; |
| 631 | register char *arg = copy_name ($1); |
| 632 | |
| 633 | msymbol = lookup_minimal_symbol (arg, |
| 634 | (struct objfile *) NULL); |
| 635 | if (msymbol != NULL) |
| 636 | { |
| 637 | write_exp_elt_opcode (OP_LONG); |
| 638 | write_exp_elt_type (builtin_type_int); |
| 639 | write_exp_elt_longcst ((LONGEST) SYMBOL_VALUE_ADDRESS (msymbol)); |
| 640 | write_exp_elt_opcode (OP_LONG); |
| 641 | write_exp_elt_opcode (UNOP_MEMVAL); |
| 642 | if (msymbol -> type == mst_data || |
| 643 | msymbol -> type == mst_bss) |
| 644 | write_exp_elt_type (builtin_type_int); |
| 645 | else if (msymbol -> type == mst_text) |
| 646 | write_exp_elt_type (lookup_function_type (builtin_type_int)); |
| 647 | else |
| 648 | write_exp_elt_type (builtin_type_char); |
| 649 | write_exp_elt_opcode (UNOP_MEMVAL); |
| 650 | } |
| 651 | else if (!have_full_symbols () && !have_partial_symbols ()) |
| 652 | error ("No symbol table is loaded. Use the \"symbol-file\" command."); |
| 653 | else |
| 654 | error ("No symbol \"%s\" in current context.", |
| 655 | copy_name ($1)); |
| 656 | } |
| 657 | } |
| 658 | ; |
| 659 | |
| 660 | type |
| 661 | : TYPENAME |
| 662 | { $$ = lookup_typename (copy_name ($1), |
| 663 | expression_context_block, 0); } |
| 664 | |
| 665 | ; |
| 666 | |
| 667 | %% |
| 668 | |
| 669 | #if 0 /* FIXME! */ |
| 670 | int |
| 671 | overflow(a,b) |
| 672 | long a,b; |
| 673 | { |
| 674 | return (MAX_OF_TYPE(builtin_type_m2_int) - b) < a; |
| 675 | } |
| 676 | |
| 677 | int |
| 678 | uoverflow(a,b) |
| 679 | unsigned long a,b; |
| 680 | { |
| 681 | return (MAX_OF_TYPE(builtin_type_m2_card) - b) < a; |
| 682 | } |
| 683 | #endif /* FIXME */ |
| 684 | |
| 685 | /* Take care of parsing a number (anything that starts with a digit). |
| 686 | Set yylval and return the token type; update lexptr. |
| 687 | LEN is the number of characters in it. */ |
| 688 | |
| 689 | /*** Needs some error checking for the float case ***/ |
| 690 | |
| 691 | static int |
| 692 | parse_number (olen) |
| 693 | int olen; |
| 694 | { |
| 695 | register char *p = lexptr; |
| 696 | register LONGEST n = 0; |
| 697 | register LONGEST prevn = 0; |
| 698 | register int c,i,ischar=0; |
| 699 | register int base = input_radix; |
| 700 | register int len = olen; |
| 701 | int unsigned_p = number_sign == 1 ? 1 : 0; |
| 702 | |
| 703 | if(p[len-1] == 'H') |
| 704 | { |
| 705 | base = 16; |
| 706 | len--; |
| 707 | } |
| 708 | else if(p[len-1] == 'C' || p[len-1] == 'B') |
| 709 | { |
| 710 | base = 8; |
| 711 | ischar = p[len-1] == 'C'; |
| 712 | len--; |
| 713 | } |
| 714 | |
| 715 | /* Scan the number */ |
| 716 | for (c = 0; c < len; c++) |
| 717 | { |
| 718 | if (p[c] == '.' && base == 10) |
| 719 | { |
| 720 | /* It's a float since it contains a point. */ |
| 721 | yylval.dval = atof (p); |
| 722 | lexptr += len; |
| 723 | return FLOAT; |
| 724 | } |
| 725 | if (p[c] == '.' && base != 10) |
| 726 | error("Floating point numbers must be base 10."); |
| 727 | if (base == 10 && (p[c] < '0' || p[c] > '9')) |
| 728 | error("Invalid digit \'%c\' in number.",p[c]); |
| 729 | } |
| 730 | |
| 731 | while (len-- > 0) |
| 732 | { |
| 733 | c = *p++; |
| 734 | n *= base; |
| 735 | if( base == 8 && (c == '8' || c == '9')) |
| 736 | error("Invalid digit \'%c\' in octal number.",c); |
| 737 | if (c >= '0' && c <= '9') |
| 738 | i = c - '0'; |
| 739 | else |
| 740 | { |
| 741 | if (base == 16 && c >= 'A' && c <= 'F') |
| 742 | i = c - 'A' + 10; |
| 743 | else |
| 744 | return ERROR; |
| 745 | } |
| 746 | n+=i; |
| 747 | if(i >= base) |
| 748 | return ERROR; |
| 749 | if(!unsigned_p && number_sign == 1 && (prevn >= n)) |
| 750 | unsigned_p=1; /* Try something unsigned */ |
| 751 | /* Don't do the range check if n==i and i==0, since that special |
| 752 | case will give an overflow error. */ |
| 753 | if(RANGE_CHECK && n!=i && i) |
| 754 | { |
| 755 | if((unsigned_p && (unsigned)prevn >= (unsigned)n) || |
| 756 | ((!unsigned_p && number_sign==-1) && -prevn <= -n)) |
| 757 | range_error("Overflow on numeric constant."); |
| 758 | } |
| 759 | prevn=n; |
| 760 | } |
| 761 | |
| 762 | lexptr = p; |
| 763 | if(*p == 'B' || *p == 'C' || *p == 'H') |
| 764 | lexptr++; /* Advance past B,C or H */ |
| 765 | |
| 766 | if (ischar) |
| 767 | { |
| 768 | yylval.ulval = n; |
| 769 | return CHAR; |
| 770 | } |
| 771 | else if ( unsigned_p && number_sign == 1) |
| 772 | { |
| 773 | yylval.ulval = n; |
| 774 | return UINT; |
| 775 | } |
| 776 | else if((unsigned_p && (n<0))) { |
| 777 | range_error("Overflow on numeric constant -- number too large."); |
| 778 | /* But, this can return if range_check == range_warn. */ |
| 779 | } |
| 780 | yylval.lval = n; |
| 781 | return INT; |
| 782 | } |
| 783 | |
| 784 | |
| 785 | /* Some tokens */ |
| 786 | |
| 787 | static struct |
| 788 | { |
| 789 | char name[2]; |
| 790 | int token; |
| 791 | } tokentab2[] = |
| 792 | { |
| 793 | { {'<', '>'}, NOTEQUAL }, |
| 794 | { {':', '='}, ASSIGN }, |
| 795 | { {'<', '='}, LEQ }, |
| 796 | { {'>', '='}, GEQ }, |
| 797 | { {':', ':'}, COLONCOLON }, |
| 798 | |
| 799 | }; |
| 800 | |
| 801 | /* Some specific keywords */ |
| 802 | |
| 803 | struct keyword { |
| 804 | char keyw[10]; |
| 805 | int token; |
| 806 | }; |
| 807 | |
| 808 | static struct keyword keytab[] = |
| 809 | { |
| 810 | {"OR" , OROR }, |
| 811 | {"IN", IN },/* Note space after IN */ |
| 812 | {"AND", LOGICAL_AND}, |
| 813 | {"ABS", ABS }, |
| 814 | {"CHR", CHR }, |
| 815 | {"DEC", DEC }, |
| 816 | {"NOT", NOT }, |
| 817 | {"DIV", DIV }, |
| 818 | {"INC", INC }, |
| 819 | {"MAX", MAX_FUNC }, |
| 820 | {"MIN", MIN_FUNC }, |
| 821 | {"MOD", MOD }, |
| 822 | {"ODD", ODD }, |
| 823 | {"CAP", CAP }, |
| 824 | {"ORD", ORD }, |
| 825 | {"VAL", VAL }, |
| 826 | {"EXCL", EXCL }, |
| 827 | {"HIGH", HIGH }, |
| 828 | {"INCL", INCL }, |
| 829 | {"SIZE", SIZE }, |
| 830 | {"FLOAT", FLOAT_FUNC }, |
| 831 | {"TRUNC", TRUNC }, |
| 832 | }; |
| 833 | |
| 834 | |
| 835 | /* Read one token, getting characters through lexptr. */ |
| 836 | |
| 837 | /* This is where we will check to make sure that the language and the operators used are |
| 838 | compatible */ |
| 839 | |
| 840 | static int |
| 841 | yylex () |
| 842 | { |
| 843 | register int c; |
| 844 | register int namelen; |
| 845 | register int i; |
| 846 | register char *tokstart; |
| 847 | register char quote; |
| 848 | |
| 849 | retry: |
| 850 | |
| 851 | tokstart = lexptr; |
| 852 | |
| 853 | |
| 854 | /* See if it is a special token of length 2 */ |
| 855 | for( i = 0 ; i < sizeof tokentab2 / sizeof tokentab2[0] ; i++) |
| 856 | if(STREQN(tokentab2[i].name, tokstart, 2)) |
| 857 | { |
| 858 | lexptr += 2; |
| 859 | return tokentab2[i].token; |
| 860 | } |
| 861 | |
| 862 | switch (c = *tokstart) |
| 863 | { |
| 864 | case 0: |
| 865 | return 0; |
| 866 | |
| 867 | case ' ': |
| 868 | case '\t': |
| 869 | case '\n': |
| 870 | lexptr++; |
| 871 | goto retry; |
| 872 | |
| 873 | case '(': |
| 874 | paren_depth++; |
| 875 | lexptr++; |
| 876 | return c; |
| 877 | |
| 878 | case ')': |
| 879 | if (paren_depth == 0) |
| 880 | return 0; |
| 881 | paren_depth--; |
| 882 | lexptr++; |
| 883 | return c; |
| 884 | |
| 885 | case ',': |
| 886 | if (comma_terminates && paren_depth == 0) |
| 887 | return 0; |
| 888 | lexptr++; |
| 889 | return c; |
| 890 | |
| 891 | case '.': |
| 892 | /* Might be a floating point number. */ |
| 893 | if (lexptr[1] >= '0' && lexptr[1] <= '9') |
| 894 | break; /* Falls into number code. */ |
| 895 | else |
| 896 | { |
| 897 | lexptr++; |
| 898 | return DOT; |
| 899 | } |
| 900 | |
| 901 | /* These are character tokens that appear as-is in the YACC grammar */ |
| 902 | case '+': |
| 903 | case '-': |
| 904 | case '*': |
| 905 | case '/': |
| 906 | case '^': |
| 907 | case '<': |
| 908 | case '>': |
| 909 | case '[': |
| 910 | case ']': |
| 911 | case '=': |
| 912 | case '{': |
| 913 | case '}': |
| 914 | case '#': |
| 915 | case '@': |
| 916 | case '~': |
| 917 | case '&': |
| 918 | lexptr++; |
| 919 | return c; |
| 920 | |
| 921 | case '\'' : |
| 922 | case '"': |
| 923 | quote = c; |
| 924 | for (namelen = 1; (c = tokstart[namelen]) != quote && c != '\0'; namelen++) |
| 925 | if (c == '\\') |
| 926 | { |
| 927 | c = tokstart[++namelen]; |
| 928 | if (c >= '0' && c <= '9') |
| 929 | { |
| 930 | c = tokstart[++namelen]; |
| 931 | if (c >= '0' && c <= '9') |
| 932 | c = tokstart[++namelen]; |
| 933 | } |
| 934 | } |
| 935 | if(c != quote) |
| 936 | error("Unterminated string or character constant."); |
| 937 | yylval.sval.ptr = tokstart + 1; |
| 938 | yylval.sval.length = namelen - 1; |
| 939 | lexptr += namelen + 1; |
| 940 | |
| 941 | if(namelen == 2) /* Single character */ |
| 942 | { |
| 943 | yylval.ulval = tokstart[1]; |
| 944 | return CHAR; |
| 945 | } |
| 946 | else |
| 947 | return STRING; |
| 948 | } |
| 949 | |
| 950 | /* Is it a number? */ |
| 951 | /* Note: We have already dealt with the case of the token '.'. |
| 952 | See case '.' above. */ |
| 953 | if ((c >= '0' && c <= '9')) |
| 954 | { |
| 955 | /* It's a number. */ |
| 956 | int got_dot = 0, got_e = 0; |
| 957 | register char *p = tokstart; |
| 958 | int toktype; |
| 959 | |
| 960 | for (++p ;; ++p) |
| 961 | { |
| 962 | if (!got_e && (*p == 'e' || *p == 'E')) |
| 963 | got_dot = got_e = 1; |
| 964 | else if (!got_dot && *p == '.') |
| 965 | got_dot = 1; |
| 966 | else if (got_e && (p[-1] == 'e' || p[-1] == 'E') |
| 967 | && (*p == '-' || *p == '+')) |
| 968 | /* This is the sign of the exponent, not the end of the |
| 969 | number. */ |
| 970 | continue; |
| 971 | else if ((*p < '0' || *p > '9') && |
| 972 | (*p < 'A' || *p > 'F') && |
| 973 | (*p != 'H')) /* Modula-2 hexadecimal number */ |
| 974 | break; |
| 975 | } |
| 976 | toktype = parse_number (p - tokstart); |
| 977 | if (toktype == ERROR) |
| 978 | { |
| 979 | char *err_copy = (char *) alloca (p - tokstart + 1); |
| 980 | |
| 981 | memcpy (err_copy, tokstart, p - tokstart); |
| 982 | err_copy[p - tokstart] = 0; |
| 983 | error ("Invalid number \"%s\".", err_copy); |
| 984 | } |
| 985 | lexptr = p; |
| 986 | return toktype; |
| 987 | } |
| 988 | |
| 989 | if (!(c == '_' || c == '$' |
| 990 | || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))) |
| 991 | /* We must have come across a bad character (e.g. ';'). */ |
| 992 | error ("Invalid character '%c' in expression.", c); |
| 993 | |
| 994 | /* It's a name. See how long it is. */ |
| 995 | namelen = 0; |
| 996 | for (c = tokstart[namelen]; |
| 997 | (c == '_' || c == '$' || (c >= '0' && c <= '9') |
| 998 | || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')); |
| 999 | c = tokstart[++namelen]) |
| 1000 | ; |
| 1001 | |
| 1002 | /* The token "if" terminates the expression and is NOT |
| 1003 | removed from the input stream. */ |
| 1004 | if (namelen == 2 && tokstart[0] == 'i' && tokstart[1] == 'f') |
| 1005 | { |
| 1006 | return 0; |
| 1007 | } |
| 1008 | |
| 1009 | lexptr += namelen; |
| 1010 | |
| 1011 | /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1) |
| 1012 | and $$digits (equivalent to $<-digits> if you could type that). |
| 1013 | Make token type LAST, and put the number (the digits) in yylval. */ |
| 1014 | |
| 1015 | if (*tokstart == '$') |
| 1016 | { |
| 1017 | register int negate = 0; |
| 1018 | c = 1; |
| 1019 | /* Double dollar means negate the number and add -1 as well. |
| 1020 | Thus $$ alone means -1. */ |
| 1021 | if (namelen >= 2 && tokstart[1] == '$') |
| 1022 | { |
| 1023 | negate = 1; |
| 1024 | c = 2; |
| 1025 | } |
| 1026 | if (c == namelen) |
| 1027 | { |
| 1028 | /* Just dollars (one or two) */ |
| 1029 | yylval.lval = - negate; |
| 1030 | return LAST; |
| 1031 | } |
| 1032 | /* Is the rest of the token digits? */ |
| 1033 | for (; c < namelen; c++) |
| 1034 | if (!(tokstart[c] >= '0' && tokstart[c] <= '9')) |
| 1035 | break; |
| 1036 | if (c == namelen) |
| 1037 | { |
| 1038 | yylval.lval = atoi (tokstart + 1 + negate); |
| 1039 | if (negate) |
| 1040 | yylval.lval = - yylval.lval; |
| 1041 | return LAST; |
| 1042 | } |
| 1043 | } |
| 1044 | |
| 1045 | /* Handle tokens that refer to machine registers: |
| 1046 | $ followed by a register name. */ |
| 1047 | |
| 1048 | if (*tokstart == '$') { |
| 1049 | for (c = 0; c < NUM_REGS; c++) |
| 1050 | if (namelen - 1 == strlen (reg_names[c]) |
| 1051 | && STREQN (tokstart + 1, reg_names[c], namelen - 1)) |
| 1052 | { |
| 1053 | yylval.lval = c; |
| 1054 | return REGNAME; |
| 1055 | } |
| 1056 | for (c = 0; c < num_std_regs; c++) |
| 1057 | if (namelen - 1 == strlen (std_regs[c].name) |
| 1058 | && STREQN (tokstart + 1, std_regs[c].name, namelen - 1)) |
| 1059 | { |
| 1060 | yylval.lval = std_regs[c].regnum; |
| 1061 | return REGNAME; |
| 1062 | } |
| 1063 | } |
| 1064 | |
| 1065 | |
| 1066 | /* Lookup special keywords */ |
| 1067 | for(i = 0 ; i < sizeof(keytab) / sizeof(keytab[0]) ; i++) |
| 1068 | if(namelen == strlen(keytab[i].keyw) && STREQN(tokstart,keytab[i].keyw,namelen)) |
| 1069 | return keytab[i].token; |
| 1070 | |
| 1071 | yylval.sval.ptr = tokstart; |
| 1072 | yylval.sval.length = namelen; |
| 1073 | |
| 1074 | /* Any other names starting in $ are debugger internal variables. */ |
| 1075 | |
| 1076 | if (*tokstart == '$') |
| 1077 | { |
| 1078 | yylval.ivar = (struct internalvar *) lookup_internalvar (copy_name (yylval.sval) + 1); |
| 1079 | return INTERNAL_VAR; |
| 1080 | } |
| 1081 | |
| 1082 | |
| 1083 | /* Use token-type BLOCKNAME for symbols that happen to be defined as |
| 1084 | functions. If this is not so, then ... |
| 1085 | Use token-type TYPENAME for symbols that happen to be defined |
| 1086 | currently as names of types; NAME for other symbols. |
| 1087 | The caller is not constrained to care about the distinction. */ |
| 1088 | { |
| 1089 | |
| 1090 | |
| 1091 | char *tmp = copy_name (yylval.sval); |
| 1092 | struct symbol *sym; |
| 1093 | |
| 1094 | if (lookup_partial_symtab (tmp)) |
| 1095 | return BLOCKNAME; |
| 1096 | sym = lookup_symbol (tmp, expression_context_block, |
| 1097 | VAR_NAMESPACE, 0, NULL); |
| 1098 | if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK) |
| 1099 | return BLOCKNAME; |
| 1100 | if (lookup_typename (copy_name (yylval.sval), expression_context_block, 1)) |
| 1101 | return TYPENAME; |
| 1102 | |
| 1103 | if(sym) |
| 1104 | { |
| 1105 | switch(sym->class) |
| 1106 | { |
| 1107 | case LOC_STATIC: |
| 1108 | case LOC_REGISTER: |
| 1109 | case LOC_ARG: |
| 1110 | case LOC_REF_ARG: |
| 1111 | case LOC_REGPARM: |
| 1112 | case LOC_LOCAL: |
| 1113 | case LOC_LOCAL_ARG: |
| 1114 | case LOC_CONST: |
| 1115 | case LOC_CONST_BYTES: |
| 1116 | return NAME; |
| 1117 | |
| 1118 | case LOC_TYPEDEF: |
| 1119 | return TYPENAME; |
| 1120 | |
| 1121 | case LOC_BLOCK: |
| 1122 | return BLOCKNAME; |
| 1123 | |
| 1124 | case LOC_UNDEF: |
| 1125 | error("internal: Undefined class in m2lex()"); |
| 1126 | |
| 1127 | case LOC_LABEL: |
| 1128 | error("internal: Unforseen case in m2lex()"); |
| 1129 | } |
| 1130 | } |
| 1131 | else |
| 1132 | { |
| 1133 | /* Built-in BOOLEAN type. This is sort of a hack. */ |
| 1134 | if(STREQN(tokstart,"TRUE",4)) |
| 1135 | { |
| 1136 | yylval.ulval = 1; |
| 1137 | return M2_TRUE; |
| 1138 | } |
| 1139 | else if(STREQN(tokstart,"FALSE",5)) |
| 1140 | { |
| 1141 | yylval.ulval = 0; |
| 1142 | return M2_FALSE; |
| 1143 | } |
| 1144 | } |
| 1145 | |
| 1146 | /* Must be another type of name... */ |
| 1147 | return NAME; |
| 1148 | } |
| 1149 | } |
| 1150 | |
| 1151 | #if 0 /* Unused */ |
| 1152 | static char * |
| 1153 | make_qualname(mod,ident) |
| 1154 | char *mod, *ident; |
| 1155 | { |
| 1156 | char *new = malloc(strlen(mod)+strlen(ident)+2); |
| 1157 | |
| 1158 | strcpy(new,mod); |
| 1159 | strcat(new,"."); |
| 1160 | strcat(new,ident); |
| 1161 | return new; |
| 1162 | } |
| 1163 | #endif /* 0 */ |
| 1164 | |
| 1165 | void |
| 1166 | yyerror(msg) |
| 1167 | char *msg; /* unused */ |
| 1168 | { |
| 1169 | printf("Parsing: %s\n",lexptr); |
| 1170 | if (yychar < 256) |
| 1171 | error("Invalid syntax in expression near character '%c'.",yychar); |
| 1172 | else |
| 1173 | error("Invalid syntax in expression"); |
| 1174 | } |
| 1175 | |