gcc/treelang/parse.y

   1 %{ /* -*- c -*- emacs mode c */
   2   /*
   3
   4      TREELANG Compiler parser.
   5
   6      ---------------------------------------------------------------------
   7
   8      Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
   9
  10      This program is free software; you can redistribute it and/or modify it
  11      under the terms of the GNU General Public License as published by the
  12      Free Software Foundation; either version 2, or (at your option) any
  13      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, write to the Free Software
  22      Foundation, 59 Temple Place - Suite 330,
  23      Boston, MA 02111-1307, USA.
  24
  25      In other words, you are welcome to use, share and improve this program.
  26      You are forbidden to forbid anyone else to use, share and improve
  27      what you give them.   Help stamp out software-hoarding!
  28
  29      ---------------------------------------------------------------------
  30
  31      Written by Tim Josling 1999-2001, based in part on other parts of
  32      the GCC compiler.
  33
  34    */
  35
  36   /*
  37
  38      Grammar Conflicts
  39      *****************
  40
  41      There are no conflicts in this grammar.  Please keep it that way.
  42
  43    */
  44
  45 #include "config.h"
  46 #include "system.h"
  47 #include "coretypes.h"
  48 #include "tm.h"
  49 #include "diagnostic.h"
  50 #include "timevar.h"
  51
  52 #include "treelang.h"
  53 #include "treetree.h"
  54
  55 #define YYDEBUG 1
  56 #define YYPRINT(file, type, value) print_token (file, type, value)
  57 #define YYERROR_VERBOSE YES
  58
  59 /* My yylex routine used to intercept calls to flex generated code, to
  60      record lex time.  */
  61 int yylex (void);
  62 static inline int my_yylex (void);
  63 /* Call lex, but ensure time is charged to TV_LEX.  */
  64 static inline int
  65 my_yylex (void)
  66 {
  67   int res;
  68   timevar_push (TV_LEX);
  69   res = yylex ();
  70   timevar_pop (TV_LEX);
  71   return res;
  72 }
  73 #define yylex my_yylex
  74
  75 extern int option_parser_trace;
  76
  77 /* Local prototypes.  */
  78
  79 static void yyerror (const char *error_message);
  80 int yyparse (void);
  81 void print_token (FILE * file, unsigned int type ATTRIBUTE_UNUSED, YYSTYPE value);
  82 static struct prod_token_parm_item *reverse_prod_list (struct prod_token_parm_item *old_first);
  83 static void ensure_not_void (unsigned int type, struct prod_token_parm_item* name);
  84 static int check_type_match (int type_num, struct prod_token_parm_item *exp);
  85 static int get_common_type (struct prod_token_parm_item *type1,
  86                             struct prod_token_parm_item *type2);
  87 static struct prod_token_parm_item *make_integer_constant (struct prod_token_parm_item* value);
  88 static struct prod_token_parm_item *make_plus_expression
  89   (struct prod_token_parm_item* tok, struct prod_token_parm_item* op1,
  90    struct prod_token_parm_item* op2, int type_code, int prod_code);
  91 static void set_storage (struct prod_token_parm_item *prod);
  92
  93 /* File global variables.  */
  94
  95 static struct prod_token_parm_item *current_function=NULL;
  96
  97 %}
  98
  99 /* Not %raw - seems to have bugs.  */
 100 %token_table
 101
 102 /* Punctuation.  */
 103 %token RIGHT_BRACE
 104 %token LEFT_BRACE
 105 %token RIGHT_SQUARE_BRACKET
 106 %token LEFT_SQUARE_BRACKET
 107 %token RIGHT_PARENTHESIS
 108 %token LEFT_PARENTHESIS
 109 %token SEMICOLON
 110 %token ASTERISK
 111 %token COMMA
 112 %right EQUALS
 113 %right ASSIGN
 114 %left  tl_PLUS
 115 %left  tl_MINUS
 116
 117 /* Literals.  */
 118 %token INTEGER
 119
 120 /* Keywords.  */
 121 %token IF
 122 %token ELSE
 123 %token tl_RETURN
 124 %token CHAR
 125 %token INT
 126 %token UNSIGNED
 127 %token VOID
 128 %token TYPEDEF
 129 %token NAME
 130 %token STATIC
 131 %token AUTOMATIC
 132 %token EXTERNAL_DEFINITION
 133 %token EXTERNAL_REFERENCE
 134
 135 /* Tokens not passed to parser.  */
 136 %token WHITESPACE
 137 %token COMMENT
 138
 139 /* Pseudo tokens - productions.  */
 140 %token PROD_VARIABLE_NAME
 141 %token PROD_TYPE_NAME
 142 %token PROD_FUNCTION_NAME
 143 %token PROD_INTEGER_CONSTANT
 144 %token PROD_PLUS_EXPRESSION
 145 %token PROD_MINUS_EXPRESSION
 146 %token PROD_ASSIGN_EXPRESSION
 147 %token PROD_VARIABLE_REFERENCE_EXPRESSION
 148 %token PROD_PARAMETER
 149 %token PROD_FUNCTION_INVOCATION
 150 %expect 0
 151 %%
 152
 153 file:
 154 /* Nil.   */ {
 155   /* Nothing to do.  */
 156 }
 157 |declarations {
 158   /* Nothing to do.  */
 159 }
 160 ;
 161
 162
 163 declarations:
 164 declaration {
 165   /* Nothing to do.  */
 166 }
 167 | declarations declaration {
 168   /* Nothing to do.  */
 169 }
 170 ;
 171
 172 declaration:
 173 variable_def {
 174   /* Nothing to do.  */
 175 }
 176 |function_prototype {
 177   /* Nothing to do.  */
 178 }
 179 |function {
 180   /* Nothing to do.  */
 181 }
 182 ;
 183
 184 variable_def:
 185 storage typename NAME init_opt SEMICOLON {
 186   struct prod_token_parm_item* tok;
 187   struct prod_token_parm_item *prod;
 188   tok = $3;
 189   prod = make_production (PROD_VARIABLE_NAME, tok);
 190   SYMBOL_TABLE_NAME (prod) = tok;
 191   EXPRESSION_TYPE (prod) = $2;
 192   VAR_INIT (prod) = $4;
 193   NUMERIC_TYPE (prod) = NUMERIC_TYPE (( (struct prod_token_parm_item*)EXPRESSION_TYPE (prod)));
 194   ensure_not_void (NUMERIC_TYPE (prod), tok);
 195   if (insert_tree_name (prod))
 196     {
 197       YYERROR;
 198     }
 199   STORAGE_CLASS_TOKEN (prod) = $1;
 200   set_storage (prod);
 201
 202   if (VAR_INIT (prod))
 203     {
 204       if (! ((struct prod_token_parm_item*)VAR_INIT (prod))->tp.pro.code)
 205         abort ();
 206     if (STORAGE_CLASS (prod) == EXTERNAL_REFERENCE_STORAGE)
 207       {
 208         fprintf (stderr, "%s:%i:%i: External reference variables may not have initial value\n",
 209                  tok->tp.tok.location.file,
 210                  tok->tp.tok.location.line, tok->tp.tok.charno);
 211         print_token (stderr, 0, tok);
 212         errorcount++;
 213         YYERROR;
 214       }
 215     }
 216   prod->tp.pro.code = tree_code_create_variable
 217     (STORAGE_CLASS (prod),
 218      ((struct prod_token_parm_item*)SYMBOL_TABLE_NAME (prod))->tp.tok.chars,
 219      ((struct prod_token_parm_item*)SYMBOL_TABLE_NAME (prod))->tp.tok.length,
 220      NUMERIC_TYPE (prod),
 221      VAR_INIT (prod)? ((struct prod_token_parm_item*)VAR_INIT (prod))->tp.pro.code:NULL,
 222      tok->tp.tok.location);
 223   if (!prod->tp.pro.code)
 224     abort ();
 225 }
 226 ;
 227
 228 storage:
 229 STATIC
 230 |AUTOMATIC
 231 |EXTERNAL_DEFINITION
 232 |EXTERNAL_REFERENCE
 233 ;
 234
 235 parameter:
 236 typename NAME {
 237   struct prod_token_parm_item* tok;
 238   struct prod_token_parm_item *prod;
 239   struct prod_token_parm_item *prod2;
 240   tok = $2;
 241   prod = make_production (PROD_VARIABLE_NAME, tok);
 242   SYMBOL_TABLE_NAME (prod) = $2;
 243   EXPRESSION_TYPE (prod) = $1;
 244   NUMERIC_TYPE (prod) = NUMERIC_TYPE (( (struct prod_token_parm_item*)EXPRESSION_TYPE (prod)));
 245   ensure_not_void (NUMERIC_TYPE (prod), tok);
 246   if (insert_tree_name (prod))
 247     {
 248       YYERROR;
 249     }
 250   prod2 = make_production (PROD_PARAMETER, tok);
 251   VARIABLE (prod2) = prod;
 252   $$ = prod2;
 253 }
 254 ;
 255
 256 function_prototype:
 257 storage typename NAME LEFT_PARENTHESIS parameters RIGHT_PARENTHESIS SEMICOLON {
 258   struct prod_token_parm_item* tok;
 259   struct prod_token_parm_item *prod;
 260   struct prod_token_parm_item *type;
 261   struct prod_token_parm_item* first_parms;
 262   struct prod_token_parm_item* last_parms;
 263   struct prod_token_parm_item* this_parms;
 264   struct prod_token_parm_item *this_parm;
 265   struct prod_token_parm_item *this_parm_var;
 266   tok = $3;
 267   prod = make_production (PROD_FUNCTION_NAME, $3);
 268   SYMBOL_TABLE_NAME (prod) = $3;
 269   EXPRESSION_TYPE (prod) = $2;
 270   NUMERIC_TYPE (prod) = NUMERIC_TYPE (( (struct prod_token_parm_item*)EXPRESSION_TYPE (prod)));
 271   PARAMETERS (prod) = reverse_prod_list ($5);
 272   insert_tree_name (prod);
 273   STORAGE_CLASS_TOKEN (prod) = $1;
 274   set_storage (prod);
 275   switch (STORAGE_CLASS (prod))
 276     {
 277     case STATIC_STORAGE:
 278     case EXTERNAL_DEFINITION_STORAGE:
 279       break;
 280
 281     case AUTOMATIC_STORAGE:
 282       fprintf (stderr, "%s:%i:%i: A function cannot be automatic\n",
 283                tok->tp.tok.location.file,
 284                tok->tp.tok.location.line, tok->tp.tok.charno);
 285       print_token (stderr, 0, tok);
 286       errorcount++;
 287       YYERROR;
 288       break;
 289
 290     default:
 291       abort ();
 292     }
 293   type = EXPRESSION_TYPE (prod);
 294   /* Create a parameter list in a non-front end specific format.  */
 295   for (first_parms = NULL, last_parms = NULL, this_parm = PARAMETERS (prod);
 296        this_parm;
 297        this_parm = this_parm->tp.pro.next)
 298     {
 299       if (this_parm->category != production_category)
 300         abort ();
 301       this_parm_var = VARIABLE (this_parm);
 302       if (!this_parm_var)
 303         abort ();
 304       if (this_parm_var->category != production_category)
 305         abort ();
 306       this_parms = my_malloc (sizeof (struct prod_token_parm_item));
 307       if (!this_parm_var->tp.pro.main_token)
 308         abort ();
 309       this_parms->tp.par.variable_name = this_parm_var->tp.pro.main_token->tp.tok.chars;
 310       this_parms->category = parameter_category;
 311       this_parms->type = NUMERIC_TYPE
 312         (( (struct prod_token_parm_item*)EXPRESSION_TYPE (this_parm_var)));
 313       if (last_parms)
 314         {
 315           last_parms->tp.par.next = this_parms;
 316           last_parms = this_parms;
 317         }
 318       else
 319         {
 320           first_parms = this_parms;
 321           last_parms = this_parms;
 322         }
 323       this_parms->tp.par.where_to_put_var_tree =
 324         & (( (struct prod_token_parm_item*)VARIABLE (this_parm))->tp.pro.code);
 325     }
 326   FIRST_PARMS (prod) = first_parms;
 327
 328   prod->tp.pro.code = tree_code_create_function_prototype
 329     (tok->tp.tok.chars, STORAGE_CLASS (prod), NUMERIC_TYPE (type),
 330      first_parms, tok->tp.tok.location);
 331 }
 332 ;
 333
 334 function:
 335 NAME LEFT_BRACE {
 336   struct prod_token_parm_item *proto;
 337   struct prod_token_parm_item search_prod;
 338   struct prod_token_parm_item* tok;
 339   struct prod_token_parm_item *this_parm;
 340   tok = $1;
 341   SYMBOL_TABLE_NAME ((&search_prod)) = tok;
 342   search_prod.category = token_category;
 343   current_function = proto = lookup_tree_name (&search_prod);
 344   if (!proto)
 345     {
 346       fprintf (stderr, "%s:%i:%i: Function prototype not found\n",
 347                tok->tp.tok.location.file,
 348                tok->tp.tok.location.line, tok->tp.tok.charno);
 349       print_token (stderr, 0, tok);
 350       errorcount++;
 351       YYERROR;
 352     }
 353   if (!proto->tp.pro.code)
 354     abort ();
 355   tree_code_create_function_initial
 356     (proto->tp.pro.code, tok->tp.tok.location,
 357      FIRST_PARMS (current_function));
 358
 359   /* Check all the parameters have code.  */
 360   for (this_parm = PARAMETERS (proto);
 361        this_parm;
 362        this_parm = this_parm->tp.pro.next)
 363     {
 364       if (! (struct prod_token_parm_item*)VARIABLE (this_parm))
 365         abort ();
 366       if (! (( (struct prod_token_parm_item*)VARIABLE (this_parm))->tp.pro.code))
 367         abort ();
 368     }
 369 }
 370 variable_defs_opt statements_opt RIGHT_BRACE {
 371   struct prod_token_parm_item* tok;
 372   tok = $1;
 373   tree_code_create_function_wrapup (tok->tp.tok.location);
 374   current_function = NULL;
 375 }
 376 ;
 377
 378 variable_defs_opt:
 379 /* Nil.   */ {
 380   $$ = 0;
 381 }
 382 |variable_defs {
 383   $$ = $1;
 384 }
 385 ;
 386
 387 statements_opt:
 388 /* Nil.   */ {
 389   $$ = 0;
 390 }
 391 |statements {
 392   $$ = $1;
 393 }
 394 ;
 395
 396 variable_defs:
 397 variable_def {
 398   /* Nothing to do.  */
 399 }
 400 |variable_defs variable_def {
 401   /* Nothing to do.  */
 402 }
 403 ;
 404
 405 typename:
 406 INT {
 407   struct prod_token_parm_item* tok;
 408   struct prod_token_parm_item *prod;
 409   tok = $1;
 410   prod = make_production (PROD_TYPE_NAME, tok);
 411   NUMERIC_TYPE (prod) = SIGNED_INT;
 412   prod->tp.pro.code = tree_code_get_type (NUMERIC_TYPE (prod));
 413   $$ = prod;
 414 }
 415 |UNSIGNED INT {
 416   struct prod_token_parm_item* tok;
 417   struct prod_token_parm_item *prod;
 418   tok = $1;
 419   prod = make_production (PROD_TYPE_NAME, tok);
 420   NUMERIC_TYPE (prod) = UNSIGNED_INT;
 421   prod->tp.pro.code = tree_code_get_type (NUMERIC_TYPE (prod));
 422   $$ = prod;
 423 }
 424 |CHAR {
 425   struct prod_token_parm_item* tok;
 426   struct prod_token_parm_item *prod;
 427   tok = $1;
 428   prod = make_production (PROD_TYPE_NAME, tok);
 429   NUMERIC_TYPE (prod) = SIGNED_CHAR;
 430   prod->tp.pro.code = tree_code_get_type (NUMERIC_TYPE (prod));
 431   $$ = prod;
 432 }
 433 |UNSIGNED CHAR {
 434   struct prod_token_parm_item* tok;
 435   struct prod_token_parm_item *prod;
 436   tok = $1;
 437   prod = make_production (PROD_TYPE_NAME, tok);
 438   NUMERIC_TYPE (prod) = UNSIGNED_CHAR;
 439   prod->tp.pro.code = tree_code_get_type (NUMERIC_TYPE (prod));
 440   $$ = prod;
 441 }
 442 |VOID {
 443   struct prod_token_parm_item* tok;
 444   struct prod_token_parm_item *prod;
 445   tok = $1;
 446   prod = make_production (PROD_TYPE_NAME, tok);
 447   NUMERIC_TYPE (prod) = VOID_TYPE;
 448   prod->tp.pro.code = tree_code_get_type (NUMERIC_TYPE (prod));
 449   $$ = prod;
 450 }
 451 ;
 452
 453 parameters:
 454 parameter {
 455   /* Nothing to do.  */
 456   $$ = $1;
 457 }
 458 |parameters COMMA parameter {
 459   struct prod_token_parm_item *prod1;
 460   prod1 = $3;
 461   prod1->tp.pro.next = $1; /* Insert in reverse order.  */
 462   $$ = prod1;
 463 }
 464 ;
 465
 466 statements:
 467 statement {
 468   /* Nothing to do.  */
 469 }
 470 |statements statement {
 471   /* Nothing to do.  */
 472 }
 473 ;
 474
 475 statement:
 476 expression SEMICOLON {
 477   struct prod_token_parm_item *exp;
 478   exp = $1;
 479   tree_code_output_expression_statement (exp->tp.pro.code,
 480                                          exp->tp.pro.main_token->tp.tok.location);
 481 }
 482 |return SEMICOLON {
 483   /* Nothing to do.  */
 484 }
 485 |if_statement {
 486   /* Nothing to do.  */
 487 }
 488 ;
 489
 490 if_statement:
 491 IF LEFT_PARENTHESIS expression RIGHT_PARENTHESIS {
 492   struct prod_token_parm_item* tok;
 493   struct prod_token_parm_item *exp;
 494   tok = $1;
 495   exp = $3;
 496   ensure_not_void (NUMERIC_TYPE (exp), exp->tp.pro.main_token);
 497   tree_code_if_start (exp->tp.pro.code, tok->tp.tok.location);
 498 }
 499 LEFT_BRACE statements_opt RIGHT_BRACE {
 500   /* Just let the statements flow.  */
 501 }
 502 ELSE {
 503   struct prod_token_parm_item* tok;
 504   tok = $1;
 505   tree_code_if_else (tok->tp.tok.location);
 506 }
 507 LEFT_BRACE statements_opt RIGHT_BRACE {
 508   struct prod_token_parm_item* tok;
 509   tok = $12;
 510   tree_code_if_end (tok->tp.tok.location);
 511 }
 512 ;
 513
 514
 515 return:
 516 tl_RETURN expression_opt {
 517   struct prod_token_parm_item *type_prod;
 518   struct prod_token_parm_item* ret_tok;
 519   ret_tok = $1;
 520   type_prod = EXPRESSION_TYPE (current_function);
 521   if (NUMERIC_TYPE (type_prod) == VOID)
 522     if ($2 == NULL)
 523       tree_code_generate_return (type_prod->tp.pro.code, NULL);
 524     else
 525       {
 526         fprintf (stderr, "%s:%i:%i: Redundant expression in return\n",
 527                  ret_tok->tp.tok.location.file,
 528                  ret_tok->tp.tok.location.line, ret_tok->tp.tok.charno);
 529         print_token (stderr, 0, ret_tok);
 530         errorcount++;
 531         tree_code_generate_return (type_prod->tp.pro.code, NULL);
 532       }
 533   else
 534     if ($2 == NULL)
 535       {
 536         fprintf (stderr, "%s:%i:%i: Expression missing in return\n",
 537                  ret_tok->tp.tok.location.file,
 538                  ret_tok->tp.tok.location.line, ret_tok->tp.tok.charno);
 539         print_token (stderr, 0, ret_tok);
 540         errorcount++;
 541       }
 542     else
 543       {
 544         struct prod_token_parm_item *exp;
 545         exp = $2;
 546         /* Check same type.  */
 547         if (check_type_match (NUMERIC_TYPE (type_prod), $2))
 548           {
 549             if (!type_prod->tp.pro.code)
 550               abort ();
 551             if (!exp->tp.pro.code)
 552               abort ();
 553             /* Generate the code. */
 554             tree_code_generate_return (type_prod->tp.pro.code, exp->tp.pro.code);
 555           }
 556       }
 557 }
 558 ;
 559
 560 expression_opt:
 561 /* Nil.   */ {
 562   $$ = 0;
 563 }
 564 |expression {
 565   struct prod_token_parm_item *exp;
 566   exp = $1;
 567   if (!exp->tp.pro.code)
 568     abort ();
 569
 570   $$ = $1;
 571 }
 572 ;
 573
 574 expression:
 575 INTEGER {
 576   $$ = make_integer_constant ($1);
 577 }
 578 |variable_ref {
 579   $$ = $1;
 580 }
 581 |expression tl_PLUS expression {
 582   struct prod_token_parm_item *tok = $2;
 583   struct prod_token_parm_item *op1 = $1;
 584   struct prod_token_parm_item *op2 = $3;
 585   int type_code = get_common_type (op1, op2);
 586   if (!type_code)
 587     YYERROR;
 588   $$ = make_plus_expression
 589      (tok, op1, op2, type_code, EXP_PLUS);
 590 }
 591 |expression tl_MINUS expression %prec tl_PLUS {
 592   struct prod_token_parm_item *tok = $2;
 593   struct prod_token_parm_item *op1 = $1;
 594   struct prod_token_parm_item *op2 = $3;
 595   int type_code = get_common_type (op1, op2);
 596   if (!type_code)
 597     YYERROR;
 598   $$ = make_plus_expression
 599      (tok, op1, op2, type_code, EXP_MINUS);
 600 }
 601 |expression EQUALS expression {
 602   struct prod_token_parm_item *tok = $2;
 603   struct prod_token_parm_item *op1 = $1;
 604   struct prod_token_parm_item *op2 = $3;
 605   $$ = make_plus_expression
 606      (tok, op1, op2, SIGNED_INT, EXP_EQUALS);
 607 }
 608 |variable_ref ASSIGN expression {
 609   struct prod_token_parm_item *tok = $2;
 610   struct prod_token_parm_item *op1 = $1;
 611   struct prod_token_parm_item *op2 = $3;
 612   int type_code = NUMERIC_TYPE (op1);
 613   if (!type_code)
 614     YYERROR;
 615   $$ = make_plus_expression
 616      (tok, op1, op2, type_code, EXP_ASSIGN);
 617 }
 618 |function_invocation {
 619   $$ = $1;
 620 }
 621 ;
 622
 623 function_invocation:
 624 NAME LEFT_PARENTHESIS expressions_with_commas RIGHT_PARENTHESIS {
 625   struct prod_token_parm_item *prod;
 626   struct prod_token_parm_item* tok;
 627   struct prod_token_parm_item search_prod;
 628   struct prod_token_parm_item *proto;
 629   struct prod_token_parm_item *exp;
 630   struct prod_token_parm_item *exp_proto;
 631   struct prod_token_parm_item *var;
 632   int exp_proto_count;
 633   int exp_count;
 634   tree parms;
 635   tree type;
 636
 637   tok = $1;
 638   prod = make_production (PROD_FUNCTION_INVOCATION, tok);
 639   SYMBOL_TABLE_NAME (prod) = tok;
 640   PARAMETERS (prod) = reverse_prod_list ($3);
 641   SYMBOL_TABLE_NAME ((&search_prod)) = tok;
 642   search_prod.category = token_category;
 643   proto = lookup_tree_name (&search_prod);
 644   if (!proto)
 645     {
 646       fprintf (stderr, "%s:%i:%i: Function prototype not found\n",
 647                tok->tp.tok.location.file,
 648                tok->tp.tok.location.line, tok->tp.tok.charno);
 649       print_token (stderr, 0, tok);
 650       errorcount++;
 651       YYERROR;
 652     }
 653   EXPRESSION_TYPE (prod) = EXPRESSION_TYPE (proto);
 654   NUMERIC_TYPE (prod) = NUMERIC_TYPE (proto);
 655   /* Count the expressions and ensure they match the prototype.  */
 656   for (exp_proto_count = 0, exp_proto = PARAMETERS (proto);
 657        exp_proto; exp_proto = exp_proto->tp.pro.next)
 658     exp_proto_count++;
 659
 660   for (exp_count = 0, exp = PARAMETERS (prod); exp; exp = exp->tp.pro.next)
 661     exp_count++;
 662
 663   if (exp_count !=  exp_proto_count)
 664     {
 665       fprintf (stderr, "%s:%i:%i: expression count mismatch with prototype\n",
 666                tok->tp.tok.location.file,
 667                tok->tp.tok.location.line, tok->tp.tok.charno);
 668       print_token (stderr, 0, tok);
 669       errorcount++;
 670       YYERROR;
 671     }
 672   parms = tree_code_init_parameters ();
 673   for (exp_proto = PARAMETERS (proto), exp = PARAMETERS (prod);
 674        exp_proto;
 675        exp = exp->tp.pro.next, exp_proto = exp_proto->tp.pro.next)
 676   {
 677     if (!exp)
 678       abort ();
 679     if (!exp_proto)
 680       abort ();
 681     if (!exp->tp.pro.code)
 682       abort ();
 683     var = VARIABLE (exp_proto);
 684     if (!var)
 685       abort ();
 686     if (!var->tp.pro.code)
 687       abort ();
 688     parms = tree_code_add_parameter (parms, var->tp.pro.code, exp->tp.pro.code);
 689   }
 690   type = get_type_for_numeric_type (NUMERIC_TYPE (prod));
 691   prod->tp.pro.code = tree_code_get_expression
 692     (EXP_FUNCTION_INVOCATION, type, proto->tp.pro.code, parms, NULL);
 693   $$ = prod;
 694 }
 695 ;
 696
 697 expressions_with_commas:
 698 expression {
 699   struct prod_token_parm_item *exp;
 700   exp = $1;
 701   ensure_not_void (NUMERIC_TYPE (exp), exp->tp.pro.main_token);
 702   $$ = $1;
 703 }
 704 |expressions_with_commas COMMA expression {
 705   struct prod_token_parm_item *exp;
 706   exp = $3;
 707   ensure_not_void (NUMERIC_TYPE (exp), exp->tp.pro.main_token);
 708   exp->tp.pro.next = $1; /* Reverse order.  */
 709   $$ = exp;
 710 }
 711 ;
 712
 713 variable_ref:
 714 NAME {
 715   struct prod_token_parm_item search_prod;
 716   struct prod_token_parm_item *prod;
 717   struct prod_token_parm_item *symbol_table_entry;
 718   struct prod_token_parm_item* tok;
 719   tree type;
 720
 721   tok = $1;
 722   SYMBOL_TABLE_NAME ((&search_prod)) = tok;
 723   search_prod.category = token_category;
 724   symbol_table_entry = lookup_tree_name (&search_prod);
 725   if (!symbol_table_entry)
 726     {
 727       fprintf (stderr, "%s:%i:%i: Variable referred to but not defined\n",
 728               tok->tp.tok.location.file,
 729               tok->tp.tok.location.line, tok->tp.tok.charno);
 730       print_token (stderr, 0, tok);
 731       errorcount++;
 732       YYERROR;
 733     }
 734
 735   prod = make_production (PROD_VARIABLE_REFERENCE_EXPRESSION, tok);
 736   NUMERIC_TYPE (prod) = NUMERIC_TYPE (symbol_table_entry);
 737   type = get_type_for_numeric_type (NUMERIC_TYPE (prod));
 738   if (!NUMERIC_TYPE (prod))
 739     YYERROR;
 740   OP1 (prod) = $1;
 741
 742   prod->tp.pro.code = tree_code_get_expression (EXP_REFERENCE, type,
 743                                       symbol_table_entry->tp.pro.code, NULL, NULL);
 744   $$ = prod;
 745 }
 746 ;
 747
 748 init_opt:
 749 /* Nil.   */ {
 750   $$ = 0;
 751 }
 752 |init {
 753   /* Nothing to do.  */
 754 };
 755
 756 init:
 757 ASSIGN init_element {
 758 }
 759 ;
 760
 761 init_element:
 762 INTEGER {
 763   $$ = make_integer_constant ($1);
 764 }
 765 ;
 766
 767 %%
 768
 769 /* Print a token VALUE to file FILE.  Ignore TYPE which is the token
 770    type. */
 771
 772 void
 773 print_token (FILE * file, unsigned int type ATTRIBUTE_UNUSED, YYSTYPE value)
 774 {
 775   struct prod_token_parm_item *tok;
 776   unsigned int  ix;
 777
 778   tok  =  value;
 779   fprintf (file, "%d \"", tok->tp.tok.location.line);
 780   for (ix  =  0; ix < tok->tp.tok.length; ix++)
 781     fprintf (file, "%c", tok->tp.tok.chars[ix]);
 782   fprintf (file, "\"");
 783 }
 784
 785 /* Output a message ERROR_MESSAGE from the parser.  */
 786 void
 787 yyerror (const char *error_message)
 788 {
 789   struct prod_token_parm_item *tok;
 790
 791   tok = yylval;
 792   if (tok)
 793     {
 794       fprintf (stderr, "%s:%i:%i: %s\n", tok->tp.tok.location.file,
 795                tok->tp.tok.location.line, tok->tp.tok.charno, error_message);
 796       print_token (stderr, 0, tok);
 797     }
 798   else
 799     fprintf (stderr, "%s\n", error_message);
 800
 801   errorcount++;
 802
 803 }
 804
 805 /* Reverse the order of a token list, linked by parse_next, old first
 806    token is OLD_FIRST.  */
 807
 808 static struct prod_token_parm_item*
 809 reverse_prod_list (struct prod_token_parm_item *old_first)
 810 {
 811   struct prod_token_parm_item *current;
 812   struct prod_token_parm_item *next;
 813   struct prod_token_parm_item *prev = NULL;
 814
 815   current = old_first;
 816   prev = NULL;
 817
 818   while (current)
 819     {
 820       if (current->category != production_category)
 821         abort ();
 822       next = current->tp.pro.next;
 823       current->tp.pro.next = prev;
 824       prev = current;
 825       current = next;
 826     }
 827   return prev;
 828 }
 829
 830 /* Ensure TYPE is not VOID. Use NAME as the token for the error location.  */
 831
 832 static void
 833 ensure_not_void (unsigned int type, struct prod_token_parm_item* name)
 834 {
 835   if (type == VOID)
 836     {
 837       fprintf (stderr, "%s:%i:%i: Type must not be void in this context\n",
 838                name->tp.tok.location.file,
 839                name->tp.tok.location.line, name->tp.tok.charno);
 840       print_token (stderr, 0, name);
 841       errorcount++;
 842     }
 843 }
 844
 845 /* Check TYPE1 and TYPE2 which are integral types.  Return the lowest
 846    common type (min is signed int).  */
 847
 848 static int
 849 get_common_type (struct prod_token_parm_item *type1, struct prod_token_parm_item *type2)
 850 {
 851   if (NUMERIC_TYPE (type1) == UNSIGNED_INT)
 852     return UNSIGNED_INT;
 853   if (NUMERIC_TYPE (type2) == UNSIGNED_INT)
 854     return UNSIGNED_INT;
 855
 856   return SIGNED_INT;
 857 }
 858
 859 /* Check type (TYPE_NUM) and expression (EXP) match.  Return the 1 if
 860    OK else 0.  Must be exact match - same name unless it is an
 861    integral type.  */
 862
 863 static int
 864 check_type_match (int type_num, struct prod_token_parm_item *exp)
 865 {
 866   switch (type_num)
 867     {
 868     case SIGNED_INT:
 869     case UNSIGNED_INT:
 870     case SIGNED_CHAR:
 871     case UNSIGNED_CHAR:
 872       switch (NUMERIC_TYPE (exp))
 873         {
 874         case SIGNED_INT:
 875         case UNSIGNED_INT:
 876         case SIGNED_CHAR:
 877         case UNSIGNED_CHAR:
 878           return 1;
 879
 880         case VOID:
 881           abort ();
 882
 883         default:
 884           abort ();
 885         }
 886       break;
 887
 888     case VOID:
 889       abort ();
 890
 891     default:
 892       abort ();
 893
 894     }
 895 }
 896
 897 /* Make a production for an integer constant VALUE.  */
 898
 899 static struct prod_token_parm_item *
 900 make_integer_constant (struct prod_token_parm_item* value)
 901 {
 902   struct prod_token_parm_item* tok;
 903   struct prod_token_parm_item *prod;
 904   tok = value;
 905   prod = make_production (PROD_INTEGER_CONSTANT, tok);
 906   if ((tok->tp.tok.chars[0] == (unsigned char)'-')|| (tok->tp.tok.chars[0] == (unsigned char)'+'))
 907     NUMERIC_TYPE (prod) = SIGNED_INT;
 908   else
 909     NUMERIC_TYPE (prod) = UNSIGNED_INT;
 910   prod->tp.pro.code = tree_code_get_integer_value (tok->tp.tok.chars, tok->tp.tok.length);
 911   return prod;
 912 }
 913
 914
 915 /* Build a PROD_PLUS_EXPRESSION.  This is uses for PLUS, MINUS, ASSIGN
 916    and EQUALS expressions.  */
 917
 918 static struct prod_token_parm_item *
 919 make_plus_expression (struct prod_token_parm_item* tok,
 920                       struct prod_token_parm_item* op1,
 921                       struct prod_token_parm_item* op2,
 922                       int type_code, int prod_code)
 923 {
 924   struct prod_token_parm_item *prod;
 925   tree type;
 926
 927   ensure_not_void (NUMERIC_TYPE (op1), op1->tp.pro.main_token);
 928   ensure_not_void (NUMERIC_TYPE (op2), op2->tp.pro.main_token);
 929
 930   prod = make_production (PROD_PLUS_EXPRESSION, tok);
 931
 932   NUMERIC_TYPE (prod) = type_code;
 933   type = get_type_for_numeric_type (NUMERIC_TYPE (prod));
 934   if (!type)
 935     abort ();
 936   OP1 (prod) = op1;
 937   OP2 (prod) = op2;
 938
 939   prod->tp.pro.code = tree_code_get_expression
 940      (prod_code, type, op1->tp.pro.code,
 941       op2->tp.pro.code, NULL);
 942
 943   return prod;
 944 }
 945
 946
 947 /* Set STORAGE_CLASS in PROD according to CLASS_TOKEN.  */
 948
 949 static void
 950 set_storage (struct prod_token_parm_item *prod)
 951 {
 952   struct prod_token_parm_item* stg_class;
 953   stg_class = STORAGE_CLASS_TOKEN (prod);
 954   switch (stg_class->type)
 955     {
 956     case STATIC:
 957       STORAGE_CLASS (prod) = STATIC_STORAGE;
 958       break;
 959
 960     case AUTOMATIC:
 961       STORAGE_CLASS (prod) = AUTOMATIC_STORAGE;
 962       break;
 963
 964     case EXTERNAL_DEFINITION:
 965       STORAGE_CLASS (prod) = EXTERNAL_DEFINITION_STORAGE;
 966       break;
 967
 968     case EXTERNAL_REFERENCE:
 969       STORAGE_CLASS (prod) = EXTERNAL_REFERENCE_STORAGE;
 970       break;
 971
 972     default:
 973       abort ();
 974     }
 975 }
 976
 977 /* Set parse trace.  */
 978
 979 void
 980 treelang_debug (void)
 981 {
 982   if (option_parser_trace)
 983     yydebug = 1;
 984 }
 985