parse.c

   1 /*
   2  * Stupid C parser, version 1e-6.
   3  *
   4  * Let's see how hard this is to do.
   5  *
   6  * Copyright (C) 2003 Transmeta Corp.
   7  *               2003 Linus Torvalds
   8  *
   9  *  Licensed under the Open Software License version 1.1
  10  */
  11
  12 #include <stdarg.h>
  13 #include <stdlib.h>
  14 #include <stdio.h>
  15 #include <string.h>
  16 #include <ctype.h>
  17 #include <unistd.h>
  18 #include <fcntl.h>
  19
  20 #include "lib.h"
  21 #include "token.h"
  22 #include "parse.h"
  23 #include "symbol.h"
  24 #include "scope.h"
  25 #include "expression.h"
  26 #include "target.h"
  27
  28 static struct symbol_list **function_symbol_list;
  29 struct symbol_list *function_computed_target_list;
  30 struct statement_list *function_computed_goto_list;
  31
  32 // Add a symbol to the list of function-local symbols
  33 #define fn_local_symbol(x) add_symbol(function_symbol_list, (x))
  34
  35 static struct token *statement(struct token *token, struct statement **tree);
  36 static struct token *external_declaration(struct token *token, struct symbol_list **list);
  37
  38 static int match_idents(struct token *token, ...)
  39 {
  40         va_list args;
  41
  42         if (token_type(token) != TOKEN_IDENT)
  43                 return 0;
  44
  45         va_start(args, token);
  46         for (;;) {
  47                 struct ident * next = va_arg(args, struct ident *);
  48                 if (!next)
  49                         return 0;
  50                 if (token->ident == next)
  51                         return 1;
  52         }
  53 }
  54
  55
  56 struct statement *alloc_statement(struct position pos, int type)
  57 {
  58         struct statement *stmt = __alloc_statement(0);
  59         stmt->type = type;
  60         stmt->pos = pos;
  61         return stmt;
  62 }
  63
  64 static struct token *struct_declaration_list(struct token *token, struct symbol_list **list);
  65
  66 static struct symbol * indirect(struct position pos, struct ctype *ctype, int type)
  67 {
  68         struct symbol *sym = alloc_symbol(pos, type);
  69
  70         sym->ctype.base_type = ctype->base_type;
  71         sym->ctype.modifiers = ctype->modifiers & ~MOD_STORAGE;
  72
  73         ctype->base_type = sym;
  74         ctype->modifiers &= MOD_STORAGE;
  75         return sym;
  76 }
  77
  78 static struct symbol *lookup_or_create_symbol(enum namespace ns, enum type type, struct token *token)
  79 {
  80         struct symbol *sym = lookup_symbol(token->ident, ns);
  81         if (!sym) {
  82                 sym = alloc_symbol(token->pos, type);
  83                 sym->ident = token->ident;
  84                 bind_symbol(sym, token->ident, ns);
  85                 if (type == SYM_LABEL)
  86                         fn_local_symbol(sym);
  87         }
  88         return sym;
  89 }
  90
  91 /*
  92  * NOTE! NS_LABEL is not just a different namespace,
  93  * it also ends up using function scope instead of the
  94  * regular symbol scope.
  95  */
  96 struct symbol *label_symbol(struct token *token)
  97 {
  98         return lookup_or_create_symbol(NS_LABEL, SYM_LABEL, token);
  99 }
 100
 101 struct token *struct_union_enum_specifier(enum namespace ns, enum type type,
 102         struct token *token, struct ctype *ctype,
 103         struct token *(*parse)(struct token *, struct symbol *))
 104 {
 105         struct symbol *sym;
 106
 107         ctype->modifiers = 0;
 108         if (token_type(token) == TOKEN_IDENT) {
 109                 sym = lookup_or_create_symbol(ns, type, token);
 110                 token = token->next;
 111                 ctype->base_type = sym;
 112                 if (match_op(token, '{')) {
 113                         token = parse(token->next, sym);
 114                         token = expect(token, '}', "at end of struct-union-enum-specifier");
 115                 }
 116                 return token;
 117         }
 118
 119         // private struct/union/enum type
 120         if (!match_op(token, '{')) {
 121                 warn(token->pos, "expected declaration");
 122                 ctype->base_type = &bad_type;
 123                 return token;
 124         }
 125
 126         sym = alloc_symbol(token->pos, type);
 127         token = parse(token->next, sym);
 128         ctype->base_type = sym;
 129         return expect(token, '}', "at end of specifier");
 130 }
 131
 132 static struct token *parse_struct_declaration(struct token *token, struct symbol *sym)
 133 {
 134         return struct_declaration_list(token, &sym->symbol_list);
 135 }
 136
 137 struct token *struct_or_union_specifier(enum type type, struct token *token, struct ctype *ctype)
 138 {
 139         return struct_union_enum_specifier(NS_STRUCT, type, token, ctype, parse_struct_declaration);
 140 }
 141
 142 static struct token *parse_enum_declaration(struct token *token, struct symbol *parent)
 143 {
 144         int nextval = 0;
 145         while (token_type(token) == TOKEN_IDENT) {
 146                 struct token *next = token->next;
 147                 struct symbol *sym;
 148
 149                 sym = alloc_symbol(token->pos, SYM_ENUM);
 150                 bind_symbol(sym, token->ident, NS_SYMBOL);
 151                 sym->ctype.base_type = parent;
 152                 parent->ctype.base_type = &int_ctype;
 153
 154                 if (match_op(next, '=')) {
 155                         struct expression *expr;
 156                         next = constant_expression(next->next, &expr);
 157                         nextval = get_expression_value(expr);
 158                 }
 159                 sym->value = nextval;
 160
 161                 token = next;
 162                 if (!match_op(token, ','))
 163                         break;
 164                 token = token->next;
 165                 nextval = nextval + 1;
 166         }
 167         return token;
 168 }
 169
 170 struct token *enum_specifier(struct token *token, struct ctype *ctype)
 171 {
 172         return struct_union_enum_specifier(NS_ENUM, SYM_ENUM, token, ctype, parse_enum_declaration);
 173 }
 174
 175 struct token *typeof_specifier(struct token *token, struct ctype *ctype)
 176 {
 177         struct symbol *sym;
 178
 179         if (!match_op(token, '(')) {
 180                 warn(token->pos, "expected '(' after typeof");
 181                 return token;
 182         }
 183         if (lookup_type(token->next)) {
 184                 token = typename(token->next, &sym);
 185                 *ctype = sym->ctype;
 186         } else {
 187                 struct symbol *typeof_sym = alloc_symbol(token->pos, SYM_TYPEOF);
 188                 token = parse_expression(token->next, &typeof_sym->initializer);
 189
 190                 ctype->modifiers = 0;
 191                 ctype->base_type = typeof_sym;
 192         }
 193         return expect(token, ')', "after typeof");
 194 }
 195
 196 static const char * handle_attribute(struct ctype *ctype, struct ident *attribute, struct expression *expr)
 197 {
 198         if (match_string_ident(attribute, "packed") ||
 199             match_string_ident(attribute, "__packed__")) {
 200                 ctype->alignment = 1;
 201                 return NULL;
 202         }
 203         if (match_string_ident(attribute, "aligned") ||
 204             match_string_ident(attribute, "__aligned__")) {
 205                 int alignment = max_alignment;
 206                 if (expr)
 207                         alignment = get_expression_value(expr);
 208                 ctype->alignment = alignment;
 209                 return NULL;
 210         }
 211         if (match_string_ident(attribute, "nocast")) {
 212                 ctype->modifiers |= MOD_NOCAST;
 213                 return NULL;
 214         }
 215         if (match_string_ident(attribute, "noderef")) {
 216                 ctype->modifiers |= MOD_NODEREF;
 217                 return NULL;
 218         }
 219         if (match_string_ident(attribute, "safe")) {
 220                 ctype->modifiers |= MOD_SAFE;
 221                 return NULL;
 222         }
 223         if (match_string_ident(attribute, "force")) {
 224                 ctype->modifiers |= MOD_FORCE;
 225                 return NULL;
 226         }
 227         if (match_string_ident(attribute, "address_space")) {
 228                 if (!expr)
 229                         return "expected address space number";
 230                 ctype->as = get_expression_value(expr);
 231                 return NULL;
 232         }
 233         if (match_string_ident(attribute, "context")) {
 234                 if (expr && expr->type == EXPR_COMMA) {
 235                         int mask = get_expression_value(expr->left);
 236                         int value = get_expression_value(expr->right);
 237                         if (value & ~mask)
 238                                 return "nonsense attribute types";
 239                         ctype->contextmask |= mask;
 240                         ctype->context |= value;
 241                         return NULL;
 242                 }
 243                 return "expected context mask and value";
 244         }
 245         if (match_string_ident(attribute, "mode") ||
 246             match_string_ident(attribute, "__mode__")) {
 247                 if (expr && expr->type == EXPR_SYMBOL) {
 248                         struct ident *ident = expr->symbol_name;
 249
 250                         /*
 251                          * Match against __QI__/__HI__/__SI__/__DI__
 252                          *
 253                          * FIXME! This is broken - we don't actually get
 254                          * the type information updated properly at this
 255                          * stage for some reason.
 256                          */
 257                         if (match_string_ident(ident, "__QI__") ||
 258                             match_string_ident(ident, "QI")) {
 259                                 ctype->modifiers |= MOD_CHAR;
 260                                 ctype->base_type = ctype_integer(ctype->modifiers);
 261                                 return NULL;
 262                         }
 263                         if (match_string_ident(ident, "__HI__") ||
 264                             match_string_ident(ident, "HI")) {
 265                                 ctype->modifiers |= MOD_SHORT;
 266                                 ctype->base_type = ctype_integer(ctype->modifiers);
 267                                 return NULL;
 268                         }
 269                         if (match_string_ident(ident, "__SI__") ||
 270                             match_string_ident(ident, "SI")) {
 271                                 /* Nothing? */
 272                                 return NULL;
 273                         }
 274                         if (match_string_ident(ident, "__DI__") ||
 275                             match_string_ident(ident, "DI")) {
 276                                 ctype->modifiers |= MOD_LONGLONG;
 277                                 ctype->base_type = ctype_integer(ctype->modifiers);
 278                                 return NULL;
 279                         }
 280                         if (match_string_ident(ident, "__word__") ||
 281                             match_string_ident(ident, "word")) {
 282                                 ctype->modifiers |= MOD_LONG;
 283                                 ctype->base_type = ctype_integer(ctype->modifiers);
 284                                 return NULL;
 285                         }
 286                         return "unknown mode attribute";
 287                 }
 288                 return "expected attribute mode symbol";
 289         }
 290
 291         /* Throw away for now.. */
 292         if (match_string_ident(attribute, "format") ||
 293             match_string_ident(attribute, "__format__"))
 294                 return NULL;
 295         if (match_string_ident(attribute, "section") ||
 296             match_string_ident(attribute, "__section__"))
 297                 return NULL;
 298         if (match_string_ident(attribute, "unused") ||
 299             match_string_ident(attribute, "__unused__"))
 300                 return NULL;
 301         if (match_string_ident(attribute, "const") ||
 302             match_string_ident(attribute, "__const__"))
 303                 return NULL;
 304         if (match_string_ident(attribute, "noreturn"))
 305                 return NULL;
 306         if (match_string_ident(attribute, "regparm"))
 307                 return NULL;
 308         if (match_string_ident(attribute, "weak"))
 309                 return NULL;
 310         if (match_string_ident(attribute, "alias"))
 311                 return NULL;
 312         if (match_string_ident(attribute, "pure"))
 313                 return NULL;
 314         if (match_string_ident(attribute, "always_inline"))
 315                 return NULL;
 316         if (match_string_ident(attribute, "syscall_linkage"))
 317                 return NULL;
 318         if (match_string_ident(attribute, "visibility"))
 319                 return NULL;
 320
 321         return "unknown attribute";
 322 }
 323
 324 struct token *attribute_specifier(struct token *token, struct ctype *ctype)
 325 {
 326         ctype->modifiers = 0;
 327         token = expect(token, '(', "after attribute");
 328         token = expect(token, '(', "after attribute");
 329
 330         for (;;) {
 331                 const char *error;
 332                 struct ident *attribute_name;
 333                 struct expression *attribute_expr;
 334
 335                 if (eof_token(token))
 336                         break;
 337                 if (match_op(token, ';'))
 338                         break;
 339                 if (token_type(token) != TOKEN_IDENT)
 340                         break;
 341                 attribute_name = token->ident;
 342                 token = token->next;
 343                 attribute_expr = NULL;
 344                 if (match_op(token, '('))
 345                         token = parens_expression(token, &attribute_expr, "in attribute");
 346                 error = handle_attribute(ctype, attribute_name, attribute_expr);
 347                 if (error)
 348                         warn(token->pos, "attribute '%s': %s", show_ident(attribute_name), error);
 349                 if (!match_op(token, ','))
 350                         break;
 351                 token = token->next;
 352         }
 353
 354         token = expect(token, ')', "after attribute");
 355         token = expect(token, ')', "after attribute");
 356         return token;
 357 }
 358
 359 #define MOD_SPECIALBITS (MOD_STRUCTOF | MOD_UNIONOF | MOD_ENUMOF | MOD_ATTRIBUTE | MOD_TYPEOF)
 360 #define MOD_SPECIFIER (MOD_CHAR | MOD_SHORT | MOD_LONG | MOD_LONGLONG | MOD_SIGNED | MOD_UNSIGNED)
 361
 362 struct symbol * ctype_integer(unsigned int spec)
 363 {
 364         static struct symbol *const integer_ctypes[][2] = {
 365                 { &llong_ctype, &ullong_ctype },
 366                 { &long_ctype,  &ulong_ctype  },
 367                 { &short_ctype, &ushort_ctype },
 368                 { &char_ctype,  &uchar_ctype  },
 369                 { &int_ctype,   &uint_ctype   },
 370         };
 371         struct symbol *const (*ctype)[2];
 372
 373         ctype = integer_ctypes;
 374         if (!(spec & MOD_LONGLONG)) {
 375                 ctype++;
 376                 if (!(spec & MOD_LONG)) {
 377                         ctype++;
 378                         if (!(spec & MOD_SHORT)) {
 379                                 ctype++;
 380                                 if (!(spec & MOD_CHAR))
 381                                         ctype++;
 382                         }
 383                 }
 384         }
 385         return ctype[0][(spec & MOD_UNSIGNED) != 0];
 386 }
 387
 388 struct symbol * ctype_fp(unsigned int spec)
 389 {
 390         if (spec & MOD_LONGLONG)
 391                 return &ldouble_ctype;
 392         if (spec & MOD_LONG)
 393                 return &double_ctype;
 394         return &float_ctype;
 395 }
 396
 397 static void apply_ctype(struct position pos, struct ctype *thistype, struct ctype *ctype)
 398 {
 399         unsigned long mod = thistype->modifiers;
 400
 401         if (mod) {
 402                 unsigned long old = ctype->modifiers;
 403                 unsigned long extra = 0, dup, conflict;
 404
 405                 if (mod & old & MOD_LONG) {
 406                         extra = MOD_LONGLONG | MOD_LONG;
 407                         mod &= ~MOD_LONG;
 408                         old &= ~MOD_LONG;
 409                 }
 410                 dup = (mod & old) | (extra & old) | (extra & mod);
 411                 if (dup)
 412                         warn(pos, "Just how %sdo you want this type to be?",
 413                                 modifier_string(dup));
 414
 415                 conflict = !(~mod & ~old & (MOD_LONG | MOD_SHORT));
 416                 if (conflict)
 417                         warn(pos, "You cannot have both long and short modifiers.");
 418
 419                 conflict = !(~mod & ~old & (MOD_SIGNED | MOD_UNSIGNED));
 420                 if (conflict)
 421                         warn(pos, "You cannot have both signed and unsigned modifiers.");
 422
 423                 // Only one storage modifier allowed, except that "inline" doesn't count.
 424                 conflict = (mod | old) & (MOD_STORAGE & ~MOD_INLINE);
 425                 conflict &= (conflict - 1);
 426                 if (conflict)
 427                         warn(pos, "multiple storage classes");
 428
 429                 ctype->modifiers = old | mod | extra;
 430         }
 431
 432         /* Context mask and value */
 433         if ((ctype->context ^ thistype->context) & (ctype->contextmask & thistype->contextmask)) {
 434                 warn(pos, "inconsistent attribute types");
 435                 thistype->context = 0;
 436                 thistype->contextmask = 0;
 437         }
 438         ctype->context |= thistype->context;
 439         ctype->contextmask |= thistype->contextmask;
 440
 441         /* Alignment */
 442         if (thistype->alignment & (thistype->alignment-1)) {
 443                 warn(pos, "I don't like non-power-of-2 alignments");
 444                 thistype->alignment = 0;
 445         }
 446         if (thistype->alignment > ctype->alignment)
 447                 ctype->alignment = thistype->alignment;
 448
 449         /* Address space */
 450         ctype->as = thistype->as;
 451 }
 452
 453
 454 static struct token *declaration_specifiers(struct token *next, struct ctype *ctype, int qual)
 455 {
 456         struct token *token;
 457
 458         while ( (token = next) != NULL ) {
 459                 struct ctype thistype;
 460                 struct ident *ident;
 461                 struct symbol *s, *type;
 462                 unsigned long mod;
 463
 464                 next = token->next;
 465                 if (token_type(token) != TOKEN_IDENT)
 466                         break;
 467                 ident = token->ident;
 468
 469                 s = lookup_symbol(ident, NS_TYPEDEF);
 470                 if (!s)
 471                         break;
 472                 thistype = s->ctype;
 473                 mod = thistype.modifiers;
 474                 if (qual && (mod & ~(MOD_ATTRIBUTE | MOD_CONST | MOD_VOLATILE)))
 475                         break;
 476                 if (mod & MOD_SPECIALBITS) {
 477                         if (mod & MOD_STRUCTOF)
 478                                 next = struct_or_union_specifier(SYM_STRUCT, next, &thistype);
 479                         else if (mod & MOD_UNIONOF)
 480                                 next = struct_or_union_specifier(SYM_UNION, next, &thistype);
 481                         else if (mod & MOD_ENUMOF)
 482                                 next = enum_specifier(next, &thistype);
 483                         else if (mod & MOD_ATTRIBUTE)
 484                                 next = attribute_specifier(next, &thistype);
 485                         else if (mod & MOD_TYPEOF)
 486                                 next = typeof_specifier(next, &thistype);
 487                         mod = thistype.modifiers;
 488                 }
 489                 type = thistype.base_type;
 490                 if (type) {
 491                         if (qual)
 492                                 break;
 493                         if (ctype->base_type)
 494                                 break;
 495                         /* User types only mix with qualifiers */
 496                         if (mod & MOD_USERTYPE) {
 497                                 if (ctype->modifiers & MOD_SPECIFIER)
 498                                         break;
 499                         }
 500                         ctype->base_type = type;
 501                 }
 502
 503                 apply_ctype(token->pos, &thistype, ctype);
 504         }
 505
 506         /* Turn the "virtual types" into real types with real sizes etc */
 507         if (!ctype->base_type) {
 508                 struct symbol *base = &incomplete_ctype;
 509
 510                 /*
 511                  * If we have modifiers, we'll default to an integer
 512                  * type, and "ctype_integer()" will turn this into
 513                  * a specific one.
 514                  */
 515                 if (ctype->modifiers & MOD_SPECIFIER)
 516                         base = &int_type;
 517                 ctype->base_type = base;
 518         }
 519
 520         if (ctype->base_type == &int_type) {
 521                 ctype->base_type = ctype_integer(ctype->modifiers & MOD_SPECIFIER);
 522                 ctype->modifiers &= ~MOD_SPECIFIER;
 523                 return token;
 524         }
 525         if (ctype->base_type == &fp_type) {
 526                 ctype->base_type = ctype_fp(ctype->modifiers & MOD_SPECIFIER);
 527                 ctype->modifiers &= ~MOD_SPECIFIER;
 528                 return token;
 529         }
 530         return token;
 531 }
 532
 533 static struct token *abstract_array_declarator(struct token *token, struct symbol *sym)
 534 {
 535         struct expression *expr = NULL;
 536
 537         token = parse_expression(token, &expr);
 538         sym->array_size = expr;
 539         return token;
 540 }
 541
 542 static struct token *parameter_type_list(struct token *, struct symbol *);
 543 static struct token *declarator(struct token *token, struct symbol **tree, struct ident **p);
 544
 545 static struct token *direct_declarator(struct token *token, struct symbol **tree, struct ident **p)
 546 {
 547         struct ctype *ctype = &(*tree)->ctype;
 548
 549         if (p && token_type(token) == TOKEN_IDENT) {
 550                 *p = token->ident;
 551                 token = token->next;
 552         }
 553
 554         for (;;) {
 555                 if (match_idents(token, &__attribute___ident, &__attribute_ident, NULL)) {
 556                         struct ctype thistype = { 0, };
 557                         token = attribute_specifier(token->next, &thistype);
 558                         apply_ctype(token->pos, &thistype, ctype);
 559                         continue;
 560                 }
 561                 if (token_type(token) != TOKEN_SPECIAL)
 562                         return token;
 563
 564                 /*
 565                  * This can be either a parameter list or a grouping.
 566                  * For the direct (non-abstract) case, we know if must be
 567                  * a paramter list if we already saw the identifier.
 568                  * For the abstract case, we know if must be a parameter
 569                  * list if it is empty or starts with a type.
 570                  */
 571                 if (token->special == '(') {
 572                         struct symbol *sym;
 573                         struct token *next = token->next;
 574                         int fn = (p && *p) || match_op(next, ')') || lookup_type(next);
 575
 576                         if (!fn) {
 577                                 struct symbol *base_type = ctype->base_type;
 578                                 token = declarator(next, tree, p);
 579                                 token = expect(token, ')', "in nested declarator");
 580                                 while (ctype->base_type != base_type)
 581                                         ctype = &ctype->base_type->ctype;
 582                                 p = NULL;
 583                                 continue;
 584                         }
 585
 586                         sym = indirect(token->pos, ctype, SYM_FN);
 587                         token = parameter_type_list(next, sym);
 588                         token = expect(token, ')', "in function declarator");
 589                         continue;
 590                 }
 591                 if (token->special == '[') {
 592                         struct symbol *array = indirect(token->pos, ctype, SYM_ARRAY);
 593                         token = abstract_array_declarator(token->next, array);
 594                         token = expect(token, ']', "in abstract_array_declarator");
 595                         ctype = &array->ctype;
 596                         continue;
 597                 }
 598                 if (token->special == ':') {
 599                         if (is_int_type (ctype->base_type)) {
 600                                 struct symbol *bitfield = indirect(token->pos, ctype, SYM_BITFIELD);
 601                                 struct expression *expr;
 602                                 token = conditional_expression(token->next, &expr);
 603                                 bitfield->fieldwidth = get_expression_value(expr);
 604                         } else
 605                                 error(token->pos, "Invalid bitfield specifier for type %s.", show_typename (ctype->base_type));
 606                         break;
 607                 }
 608                 break;
 609         }
 610         if (p) {
 611                 (*tree)->ident = *p;
 612         }
 613         return token;
 614 }
 615
 616 static struct token *pointer(struct token *token, struct ctype *ctype)
 617 {
 618         unsigned long modifiers;
 619         struct symbol *base_type;
 620
 621         modifiers = ctype->modifiers & ~(MOD_TYPEDEF | MOD_ATTRIBUTE);
 622         base_type = ctype->base_type;
 623         ctype->modifiers = modifiers;
 624
 625         while (match_op(token,'*')) {
 626                 struct symbol *ptr = alloc_symbol(token->pos, SYM_PTR);
 627                 ptr->ctype.modifiers = modifiers & ~MOD_STORAGE;
 628                 ptr->ctype.as = ctype->as;
 629                 ptr->ctype.context = ctype->context;
 630                 ptr->ctype.contextmask = ctype->contextmask;
 631                 ptr->ctype.base_type = base_type;
 632
 633                 base_type = ptr;
 634                 ctype->modifiers = modifiers & MOD_STORAGE;
 635                 ctype->base_type = base_type;
 636                 ctype->as = 0;
 637                 ctype->context = 0;
 638                 ctype->contextmask = 0;
 639
 640                 token = declaration_specifiers(token->next, ctype, 1);
 641                 modifiers = ctype->modifiers;
 642         }
 643         return token;
 644 }
 645
 646 static struct token *declarator(struct token *token, struct symbol **tree, struct ident **p)
 647 {
 648         token = pointer(token, &(*tree)->ctype);
 649         return direct_declarator(token, tree, p);
 650 }
 651
 652 static struct token *struct_declaration_list(struct token *token, struct symbol_list **list)
 653 {
 654         while (!match_op(token, '}')) {
 655                 struct ctype ctype = {0, };
 656
 657                 token = declaration_specifiers(token, &ctype, 0);
 658                 for (;;) {
 659                         struct ident *ident = NULL;
 660                         struct symbol *decl = alloc_symbol(token->pos, SYM_NODE);
 661                         decl->ctype = ctype;
 662                         token = declarator(token, &decl, &ident);
 663                         if (match_op(token, ':')) {
 664                                 struct expression *expr;
 665                                 token = parse_expression(token->next, &expr);
 666                         }
 667                         add_symbol(list, decl);
 668                         if (!match_op(token, ','))
 669                                 break;
 670                         token = token->next;
 671                 }
 672                 if (!match_op(token, ';')) {
 673                         warn(token->pos, "expected ; at end of declaration");
 674                         break;
 675                 }
 676                 token = token->next;
 677         }
 678         return token;
 679 }
 680
 681 static struct token *parameter_declaration(struct token *token, struct symbol **tree)
 682 {
 683         struct ident *ident = NULL;
 684         struct symbol *sym;
 685         struct ctype ctype = { 0, };
 686
 687         token = declaration_specifiers(token, &ctype, 0);
 688         sym = alloc_symbol(token->pos, SYM_NODE);
 689         sym->ctype = ctype;
 690         *tree = sym;
 691         token = declarator(token, tree, &ident);
 692         return token;
 693 }
 694
 695 struct token *typename(struct token *token, struct symbol **p)
 696 {
 697         struct symbol *sym = alloc_symbol(token->pos, SYM_NODE);
 698         *p = sym;
 699         token = declaration_specifiers(token, &sym->ctype, 0);
 700         return declarator(token, &sym, NULL);
 701 }
 702
 703 struct token *expression_statement(struct token *token, struct expression **tree)
 704 {
 705         token = parse_expression(token, tree);
 706         return expect(token, ';', "at end of statement");
 707 }
 708
 709 static struct token *parse_asm_operands(struct token *token, struct statement *stmt)
 710 {
 711         struct expression *expr;
 712
 713         /* Allow empty operands */
 714         if (match_op(token->next, ':') || match_op(token->next, ')'))
 715                 return token->next;
 716         do {
 717                 if (match_op(token->next, '[') &&
 718                     token_type(token->next->next) == TOKEN_IDENT &&
 719                     match_op(token->next->next->next, ']'))
 720                         token = token->next->next->next;
 721                 token = primary_expression(token->next, &expr);
 722                 token = parens_expression(token, &expr, "in asm parameter");
 723         } while (match_op(token, ','));
 724         return token;
 725 }
 726
 727 static struct token *parse_asm_clobbers(struct token *token, struct statement *stmt)
 728 {
 729         struct expression *expr;
 730
 731         do {
 732                 token = primary_expression(token->next, &expr);
 733         } while (match_op(token, ','));
 734         return token;
 735 }
 736
 737 static struct token *parse_asm(struct token *token, struct statement *stmt)
 738 {
 739         struct expression *expr;
 740
 741         stmt->type = STMT_ASM;
 742         if (match_idents(token, &__volatile___ident, &volatile_ident)) {
 743                 token = token->next;
 744         }
 745         token = expect(token, '(', "after asm");
 746         token = parse_expression(token->next, &expr);
 747         if (match_op(token, ':'))
 748                 token = parse_asm_operands(token, stmt);
 749         if (match_op(token, ':'))
 750                 token = parse_asm_operands(token, stmt);
 751         if (match_op(token, ':'))
 752                 token = parse_asm_clobbers(token, stmt);
 753         token = expect(token, ')', "after asm");
 754         return expect(token, ';', "at end of asm-statement");
 755 }
 756
 757 /* Make a statement out of an expression */
 758 static struct statement *make_statement(struct expression *expr)
 759 {
 760         struct statement *stmt;
 761
 762         if (!expr)
 763                 return NULL;
 764         stmt = alloc_statement(expr->pos, STMT_EXPRESSION);
 765         stmt->expression = expr;
 766         return stmt;
 767 }
 768
 769 /*
 770  * All iterators have two symbols associated with them:
 771  * the "continue" and "break" symbols, which are targets
 772  * for continue and break statements respectively.
 773  *
 774  * They are in a special name-space, but they follow
 775  * all the normal visibility rules, so nested iterators
 776  * automatically work right.
 777  */
 778 static void start_iterator(struct statement *stmt)
 779 {
 780         struct symbol *cont, *brk;
 781
 782         start_symbol_scope();
 783         cont = alloc_symbol(stmt->pos, SYM_NODE);
 784         cont->ident = &continue_ident;
 785         bind_symbol(cont, &continue_ident, NS_ITERATOR);
 786         brk = alloc_symbol(stmt->pos, SYM_NODE);
 787         brk->ident = &break_ident;
 788         bind_symbol(brk, &break_ident, NS_ITERATOR);
 789
 790         stmt->type = STMT_ITERATOR;
 791         stmt->iterator_break = brk;
 792         stmt->iterator_continue = cont;
 793         fn_local_symbol(brk);
 794         fn_local_symbol(cont);
 795 }
 796
 797 static void end_iterator(struct statement *stmt)
 798 {
 799         end_symbol_scope();
 800 }
 801
 802 static struct statement *start_function(struct symbol *sym)
 803 {
 804         struct symbol *ret;
 805         struct statement *stmt = alloc_statement(sym->pos, STMT_COMPOUND);
 806
 807         start_function_scope();
 808         ret = alloc_symbol(sym->pos, SYM_NODE);
 809         ret->ident = &return_ident;
 810         ret->ctype = sym->ctype.base_type->ctype;
 811         ret->ctype.modifiers &= ~(MOD_STORAGE | MOD_CONST | MOD_VOLATILE | MOD_INLINE | MOD_ADDRESSABLE | MOD_NOCAST | MOD_NODEREF | MOD_ACCESSED | MOD_TOPLEVEL);
 812         ret->ctype.modifiers |= (MOD_AUTO | MOD_REGISTER);
 813         bind_symbol(ret, &return_ident, NS_ITERATOR);
 814         stmt->ret = ret;
 815
 816         fn_local_symbol(ret);
 817         return stmt;
 818 }
 819
 820 static void end_function(struct symbol *sym)
 821 {
 822         end_function_scope();
 823 }
 824
 825 /*
 826  * A "switch()" statement, like an iterator, has a
 827  * the "break" symbol associated with it. It works
 828  * exactly like the iterator break - it's the target
 829  * for any break-statements in scope, and means that
 830  * "break" handling doesn't even need to know whether
 831  * it's breaking out of an iterator or a switch.
 832  *
 833  * In addition, the "case" symbol is a marker for the
 834  * case/default statements to find the switch statement
 835  * that they are associated with.
 836  */
 837 static void start_switch(struct statement *stmt)
 838 {
 839         struct symbol *brk, *switch_case;
 840
 841         start_symbol_scope();
 842         brk = alloc_symbol(stmt->pos, SYM_NODE);
 843         brk->ident = &break_ident;
 844         bind_symbol(brk, &break_ident, NS_ITERATOR);
 845
 846         switch_case = alloc_symbol(stmt->pos, SYM_NODE);
 847         switch_case->ident = &case_ident;
 848         bind_symbol(switch_case, &case_ident, NS_ITERATOR);
 849         switch_case->stmt = stmt;
 850
 851         stmt->type = STMT_SWITCH;
 852         stmt->switch_break = brk;
 853         stmt->switch_case = switch_case;
 854
 855         fn_local_symbol(brk);
 856         fn_local_symbol(switch_case);
 857 }
 858
 859 static void end_switch(struct statement *stmt)
 860 {
 861         if (!stmt->switch_case->symbol_list)
 862                 warn(stmt->pos, "switch with no cases");
 863         end_symbol_scope();
 864 }
 865
 866 static void add_case_statement(struct statement *stmt)
 867 {
 868         struct symbol *target = lookup_symbol(&case_ident, NS_ITERATOR);
 869         struct symbol *sym;
 870
 871         if (!target) {
 872                 warn(stmt->pos, "not in switch scope");
 873                 return;
 874         }
 875         sym = alloc_symbol(stmt->pos, SYM_NODE);
 876         add_symbol(&target->symbol_list, sym);
 877         sym->stmt = stmt;
 878         stmt->case_label = sym;
 879         fn_local_symbol(sym);
 880 }
 881
 882 static struct token *parse_return_statement(struct token *token, struct statement *stmt)
 883 {
 884         struct symbol *target = lookup_symbol(&return_ident, NS_ITERATOR);
 885
 886         if (!target)
 887                 error(token->pos, "internal error: return without a function target");
 888         stmt->type = STMT_RETURN;
 889         stmt->ret_target = target;
 890         return expression_statement(token->next, &stmt->ret_value);
 891 }
 892
 893 static struct token *parse_for_statement(struct token *token, struct statement *stmt)
 894 {
 895         struct symbol_list *syms;
 896         struct expression *e1, *e2, *e3;
 897         struct statement *iterator;
 898
 899         start_iterator(stmt);
 900         token = expect(token->next, '(', "after 'for'");
 901
 902         syms = NULL;
 903         e1 = NULL;
 904         /* C99 variable declaration? */
 905         if (lookup_type(token)) {
 906                 token = external_declaration(token, &syms);
 907         } else {
 908                 token = parse_expression(token, &e1);
 909                 token = expect(token, ';', "in 'for'");
 910         }
 911         token = parse_expression(token, &e2);
 912         token = expect(token, ';', "in 'for'");
 913         token = parse_expression(token, &e3);
 914         token = expect(token, ')', "in 'for'");
 915         token = statement(token, &iterator);
 916
 917         stmt->iterator_syms = syms;
 918         stmt->iterator_pre_statement = make_statement(e1);
 919         stmt->iterator_pre_condition = e2;
 920         stmt->iterator_post_statement = make_statement(e3);
 921         stmt->iterator_post_condition = e2;
 922         stmt->iterator_statement = iterator;
 923         end_iterator(stmt);
 924
 925         return token;
 926 }
 927
 928 struct token *parse_while_statement(struct token *token, struct statement *stmt)
 929 {
 930         struct expression *expr;
 931         struct statement *iterator;
 932
 933         start_iterator(stmt);
 934         token = parens_expression(token->next, &expr, "after 'while'");
 935         token = statement(token, &iterator);
 936
 937         stmt->iterator_pre_condition = expr;
 938         stmt->iterator_post_condition = expr;
 939         stmt->iterator_statement = iterator;
 940         end_iterator(stmt);
 941
 942         return token;
 943 }
 944
 945 struct token *parse_do_statement(struct token *token, struct statement *stmt)
 946 {
 947         struct expression *expr;
 948         struct statement *iterator;
 949
 950         start_iterator(stmt);
 951         token = statement(token->next, &iterator);
 952         if (token_type(token) == TOKEN_IDENT && token->ident == &while_ident)
 953                 token = token->next;
 954         else
 955                 warn(token->pos, "expected 'while' after 'do'");
 956         token = parens_expression(token, &expr, "after 'do-while'");
 957
 958         stmt->iterator_post_condition = expr;
 959         stmt->iterator_statement = iterator;
 960         end_iterator(stmt);
 961
 962         return expect(token, ';', "after statement");
 963 }
 964
 965 static struct token *statement(struct token *token, struct statement **tree)
 966 {
 967         struct statement *stmt = alloc_statement(token->pos, STMT_NONE);
 968
 969         *tree = stmt;
 970         if (token_type(token) == TOKEN_IDENT) {
 971                 if (token->ident == &if_ident) {
 972                         stmt->type = STMT_IF;
 973                         token = parens_expression(token->next, &stmt->if_conditional, "after if");
 974                         token = statement(token, &stmt->if_true);
 975                         if (token_type(token) != TOKEN_IDENT)
 976                                 return token;
 977                         if (token->ident != &else_ident)
 978                                 return token;
 979                         return statement(token->next, &stmt->if_false);
 980                 }
 981
 982                 if (token->ident == &return_ident)
 983                         return parse_return_statement(token, stmt);
 984
 985                 if (token->ident == &break_ident || token->ident == &continue_ident) {
 986                         struct symbol *target = lookup_symbol(token->ident, NS_ITERATOR);
 987                         stmt->type = STMT_GOTO;
 988                         stmt->goto_label = target;
 989                         if (!target)
 990                                 warn(stmt->pos, "break/continue not in iterator scope");
 991                         return expect(token->next, ';', "at end of statement");
 992                 }
 993                 if (token->ident == &default_ident) {
 994                         token = token->next;
 995                         goto default_statement;
 996                 }
 997                 if (token->ident == &case_ident) {
 998                         token = parse_expression(token->next, &stmt->case_expression);
 999                         if (match_op(token, SPECIAL_ELLIPSIS))
1000                                 token = parse_expression(token->next, &stmt->case_to);
1001 default_statement:
1002                         stmt->type = STMT_CASE;
1003                         token = expect(token, ':', "after default/case");
1004                         add_case_statement(stmt);
1005                         return statement(token, &stmt->case_statement);
1006                 }
1007                 if (token->ident == &switch_ident) {
1008                         stmt->type = STMT_SWITCH;
1009                         start_switch(stmt);
1010                         token = parens_expression(token->next, &stmt->switch_expression, "after 'switch'");
1011                         token = statement(token, &stmt->switch_statement);
1012                         end_switch(stmt);
1013                         return token;
1014                 }
1015                 if (token->ident == &for_ident)
1016                         return parse_for_statement(token, stmt);
1017
1018                 if (token->ident == &while_ident)
1019                         return parse_while_statement(token, stmt);
1020
1021                 if (token->ident == &do_ident)
1022                         return parse_do_statement(token, stmt);
1023
1024                 if (token->ident == &goto_ident) {
1025                         stmt->type = STMT_GOTO;
1026                         token = token->next;
1027                         if (match_op(token, '*')) {
1028                                 token = parse_expression(token->next, &stmt->goto_expression);
1029                                 add_statement(&function_computed_goto_list, stmt);
1030                         } else if (token_type(token) == TOKEN_IDENT) {
1031                                 stmt->goto_label = label_symbol(token);
1032                                 token = token->next;
1033                         } else {
1034                                 warn(token->pos, "Expected identifier or goto expression");
1035                         }
1036                         return expect(token, ';', "at end of statement");
1037                 }
1038                 if (match_idents(token, &asm_ident, &__asm___ident, &__asm_ident, NULL)) {
1039                         return parse_asm(token->next, stmt);
1040                 }
1041                 if (match_op(token->next, ':')) {
1042                         stmt->type = STMT_LABEL;
1043                         stmt->label_identifier = label_symbol(token);
1044                         return statement(token->next->next, &stmt->label_statement);
1045                 }
1046         }
1047
1048         if (match_op(token, '{')) {
1049                 stmt->type = STMT_COMPOUND;
1050                 start_symbol_scope();
1051                 token = compound_statement(token->next, stmt);
1052                 end_symbol_scope();
1053
1054                 return expect(token, '}', "at end of compound statement");
1055         }
1056
1057         stmt->type = STMT_EXPRESSION;
1058         return expression_statement(token, &stmt->expression);
1059 }
1060
1061 struct token * statement_list(struct token *token, struct statement_list **list)
1062 {
1063         for (;;) {
1064                 struct statement * stmt;
1065                 if (eof_token(token))
1066                         break;
1067                 if (match_op(token, '}'))
1068                         break;
1069                 token = statement(token, &stmt);
1070                 add_statement(list, stmt);
1071         }
1072         return token;
1073 }
1074
1075 static struct token *parameter_type_list(struct token *token, struct symbol *fn)
1076 {
1077         struct symbol_list **list = &fn->arguments;
1078         for (;;) {
1079                 struct symbol *sym = alloc_symbol(token->pos, SYM_NODE);
1080
1081                 if (match_op(token, SPECIAL_ELLIPSIS)) {
1082                         fn->variadic = 1;
1083                         token = token->next;
1084                         break;
1085                 }
1086
1087                 if (!lookup_type(token)) {
1088                         warn(token->pos, "non-ANSI parameter list");
1089                         break;
1090                 }
1091                 token = parameter_declaration(token, &sym);
1092                 /* Special case: (void) */
1093                 if (!*list && !sym->ident && sym->ctype.base_type == &void_ctype)
1094                         break;
1095                 add_symbol(list, sym);
1096                 if (!match_op(token, ','))
1097                         break;
1098                 token = token->next;
1099
1100         }
1101         return token;
1102 }
1103
1104 struct token *compound_statement(struct token *token, struct statement *stmt)
1105 {
1106         while (!eof_token(token)) {
1107                 if (!lookup_type(token))
1108                         break;
1109                 token = external_declaration(token, &stmt->syms);
1110         }
1111         token = statement_list(token, &stmt->stmts);
1112         return token;
1113 }
1114
1115 static struct expression *identifier_expression(struct token *token)
1116 {
1117         struct expression *expr = alloc_expression(token->pos, EXPR_IDENTIFIER);
1118         expr->expr_ident = token->ident;
1119         return expr;
1120 }
1121
1122 static struct expression *index_expression(struct expression *from, struct expression *to)
1123 {
1124         int idx_from, idx_to;
1125         struct expression *expr = alloc_expression(from->pos, EXPR_INDEX);
1126
1127         idx_from = get_expression_value(from);
1128         idx_to = idx_from;
1129         if (to) {
1130                 idx_to = get_expression_value(to);
1131                 if (idx_to < idx_from || idx_from < 0)
1132                         warn(from->pos, "nonsense array initializer index range");
1133         }
1134         expr->idx_from = idx_from;
1135         expr->idx_to = idx_to;
1136         return expr;
1137 }
1138
1139 static struct token *initializer_list(struct expression_list **list, struct token *token)
1140 {
1141         for (;;) {
1142                 struct token *next = token->next;
1143                 struct expression *expr;
1144
1145                 if (match_op(token, '.') && (token_type(next) == TOKEN_IDENT) && match_op(next->next, '=')) {
1146                         add_expression(list, identifier_expression(next));
1147                         token = next->next->next;
1148                 } else if ((token_type(token) == TOKEN_IDENT) && match_op(next, ':')) {
1149                         add_expression(list, identifier_expression(token));
1150                         token = next->next;
1151                 } else if (match_op(token, '[')) {
1152                         struct expression *from = NULL, *to = NULL;
1153                         token = constant_expression(token->next, &from);
1154                         if (match_op(token, SPECIAL_ELLIPSIS))
1155                                 token = constant_expression(token->next, &to);
1156                         add_expression(list, index_expression(from, to));
1157                         token = expect(token, ']', "at end of initializer index");
1158                         token = expect(token, '=', "at end of initializer index");
1159                 }
1160
1161                 expr = NULL;
1162                 token = initializer(&expr, token);
1163                 if (!expr)
1164                         break;
1165                 add_expression(list, expr);
1166                 if (!match_op(token, ','))
1167                         break;
1168                 token = token->next;
1169         }
1170         return token;
1171 }
1172
1173 struct token *initializer(struct expression **tree, struct token *token)
1174 {
1175         if (match_op(token, '{')) {
1176                 struct expression *expr = alloc_expression(token->pos, EXPR_INITIALIZER);
1177                 *tree = expr;
1178                 token = initializer_list(&expr->expr_list, token->next);
1179                 return expect(token, '}', "at end of initializer");
1180         }
1181         return assignment_expression(token, tree);
1182 }
1183
1184 static void declare_argument(struct symbol *sym, struct symbol *fn)
1185 {
1186         if (!sym->ident) {
1187                 warn(sym->pos, "no identifier for function argument");
1188                 return;
1189         }
1190         bind_symbol(sym, sym->ident, NS_SYMBOL);
1191 }
1192
1193 static struct token *parse_function_body(struct token *token, struct symbol *decl,
1194         struct symbol_list **list)
1195 {
1196         struct symbol *base_type = decl->ctype.base_type;
1197         struct statement *stmt;
1198         struct symbol *arg;
1199
1200         function_symbol_list = &decl->symbol_list;
1201         function_computed_target_list = NULL;
1202         function_computed_goto_list = NULL;
1203
1204         if (decl->ctype.modifiers & MOD_EXTERN) {
1205                 if (!(decl->ctype.modifiers & MOD_INLINE))
1206                         warn(decl->pos, "function with external linkage has definition");
1207         }
1208         if (!(decl->ctype.modifiers & MOD_STATIC))
1209                 decl->ctype.modifiers |= MOD_EXTERN;
1210
1211         stmt = start_function(decl);
1212
1213         base_type->stmt = stmt;
1214         FOR_EACH_PTR (base_type->arguments, arg) {
1215                 declare_argument(arg, base_type);
1216         } END_FOR_EACH_PTR;
1217
1218         token = compound_statement(token->next, stmt);
1219
1220         end_function(decl);
1221         if (!(decl->ctype.modifiers & MOD_INLINE))
1222                 add_symbol(list, decl);
1223         check_declaration(decl);
1224         function_symbol_list = NULL;
1225         if (function_computed_goto_list) {
1226                 if (!function_computed_target_list)
1227                         warn(decl->pos, "function has computed goto but no targets?");
1228                 else {
1229                         struct statement *stmt;
1230                         FOR_EACH_PTR(function_computed_goto_list, stmt) {
1231                                 stmt->target_list = function_computed_target_list;
1232                         } END_FOR_EACH_PTR;
1233                 }
1234         }
1235         return expect(token, '}', "at end of function");
1236 }
1237
1238 static struct token *external_declaration(struct token *token, struct symbol_list **list)
1239 {
1240         struct ident *ident = NULL;
1241         struct symbol *decl;
1242         struct ctype ctype = { 0, };
1243         struct symbol *base_type;
1244         int is_typedef;
1245
1246         /* Top-level inline asm? */
1247         if (match_idents(token, &asm_ident, &__asm___ident, &__asm_ident)) {
1248                 struct symbol *anon = alloc_symbol(token->pos, SYM_NODE);
1249                 struct symbol *fn = alloc_symbol(token->pos, SYM_FN);
1250                 struct statement *stmt;
1251
1252                 anon->ctype.base_type = fn;
1253                 function_symbol_list = &anon->symbol_list;
1254                 stmt = start_function(anon);
1255                 token = parse_asm(token->next, stmt);
1256                 end_function(anon);
1257                 function_symbol_list = NULL;
1258                 add_symbol(list, anon);
1259                 return token;
1260         }
1261
1262         /* Parse declaration-specifiers, if any */
1263         token = declaration_specifiers(token, &ctype, 0);
1264         decl = alloc_symbol(token->pos, SYM_NODE);
1265         decl->ctype = ctype;
1266         token = declarator(token, &decl, &ident);
1267
1268         /* Just a type declaration? */
1269         if (!ident)
1270                 return expect(token, ';', "end of type declaration");
1271
1272         decl->ident = ident;
1273
1274         /* type define declaration? */
1275         is_typedef = (ctype.modifiers & MOD_TYPEDEF) != 0;
1276
1277         /* Typedef's don't have meaningful storage */
1278         if (is_typedef) {
1279                 ctype.modifiers &= ~MOD_STORAGE;
1280                 decl->ctype.modifiers &= ~MOD_STORAGE;
1281                 decl->ctype.modifiers |= MOD_USERTYPE;
1282         }
1283
1284         bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);
1285
1286         base_type = decl->ctype.base_type;
1287         if (!is_typedef && base_type && base_type->type == SYM_FN) {
1288                 if (match_op(token, '{'))
1289                         return parse_function_body(token, decl, list);
1290
1291                 if (!(decl->ctype.modifiers & MOD_STATIC))
1292                         decl->ctype.modifiers |= MOD_EXTERN;
1293         }
1294
1295         for (;;) {
1296                 if (token_type(token) == TOKEN_IDENT) {
1297                         if (token->ident ==  &asm_ident || token->ident == &__asm_ident || token->ident == &__asm___ident) {
1298                                 struct expression *expr;
1299
1300                                 token = expect(token->next, '(', "after asm");
1301                                 token = parse_expression(token->next, &expr);
1302                                 token = expect(token, ')', "after asm");
1303                         }
1304                 }
1305                 if (!is_typedef && match_op(token, '=')) {
1306                         if (decl->ctype.modifiers & MOD_EXTERN) {
1307                                 warn(decl->pos, "symbol with external linkage has initializer");
1308                                 decl->ctype.modifiers &= ~MOD_EXTERN;
1309                         }
1310                         token = initializer(&decl->initializer, token->next);
1311                 }
1312                 if (!is_typedef) {
1313                         if (!(decl->ctype.modifiers & (MOD_EXTERN | MOD_INLINE))) {
1314                                 add_symbol(list, decl);
1315                                 if (function_symbol_list)
1316                                         fn_local_symbol(decl);
1317                         }
1318                 }
1319                 check_declaration(decl);
1320
1321                 if (!match_op(token, ','))
1322                         break;
1323
1324                 token = token->next;
1325                 ident = NULL;
1326                 decl = alloc_symbol(token->pos, SYM_NODE);
1327                 decl->ctype = ctype;
1328                 token = declaration_specifiers(token, &decl->ctype, 1);
1329                 token = declarator(token, &decl, &ident);
1330                 if (!ident) {
1331                         warn(token->pos, "expected identifier name in type definition");
1332                         return token;
1333                 }
1334
1335                 bind_symbol(decl, ident, is_typedef ? NS_TYPEDEF: NS_SYMBOL);
1336
1337                 /* Function declarations are automatically extern unless specifically static */
1338                 base_type = decl->ctype.base_type;
1339                 if (!is_typedef && base_type && base_type->type == SYM_FN) {
1340                         if (!(decl->ctype.modifiers & MOD_STATIC))
1341                                 decl->ctype.modifiers |= MOD_EXTERN;
1342                 }
1343         }
1344         return expect(token, ';', "at end of declaration");
1345 }
1346
1347 void translation_unit(struct token *token, struct symbol_list **list)
1348 {
1349         while (!eof_token(token))
1350                 token = external_declaration(token, list);
1351         // They aren't needed any more
1352         clear_token_alloc();
1353 }