symbol.c

   1 /*
   2  * Symbol lookup and handling.
   3  *
   4  * Copyright (C) 2003 Transmeta Corp.
   5  *               2003-2004 Linus Torvalds
   6  *
   7  *  Licensed under the Open Software License version 1.1
   8  */
   9 #include <stdlib.h>
  10 #include <stdio.h>
  11 #include <string.h>
  12
  13 #include "lib.h"
  14 #include "allocate.h"
  15 #include "token.h"
  16 #include "parse.h"
  17 #include "symbol.h"
  18 #include "scope.h"
  19 #include "expression.h"
  20
  21 #include "target.h"
  22
  23 /*
  24  * Secondary symbol list for stuff that needs to be output because it
  25  * was used.
  26  */
  27 struct symbol_list *translation_unit_used_list = NULL;
  28
  29 /*
  30  * If the symbol is an inline symbol, add it to the list of symbols to parse
  31  */
  32 void access_symbol(struct symbol *sym)
  33 {
  34         if (sym->ctype.modifiers & MOD_INLINE) {
  35                 if (!(sym->ctype.modifiers & MOD_ACCESSED)) {
  36                         add_symbol(&translation_unit_used_list, sym);
  37                         sym->ctype.modifiers |= MOD_ACCESSED;
  38                 }
  39         }
  40 }
  41
  42 struct symbol *lookup_symbol(struct ident *ident, enum namespace ns)
  43 {
  44         struct symbol *sym;
  45
  46         for (sym = ident->symbols; sym; sym = sym->next_id) {
  47                 if (sym->namespace & ns) {
  48                         sym->used = 1;
  49                         return sym;
  50                 }
  51         }
  52         return sym;
  53 }
  54
  55 struct context *alloc_context(void)
  56 {
  57         return __alloc_context(0);
  58 }
  59
  60 struct symbol *alloc_symbol(struct position pos, int type)
  61 {
  62         struct symbol *sym = __alloc_symbol(0);
  63         sym->type = type;
  64         sym->pos = pos;
  65         sym->endpos.type = 0;
  66         return sym;
  67 }
  68
  69 struct struct_union_info {
  70         unsigned long max_align;
  71         unsigned long bit_size;
  72         int align_size;
  73 };
  74
  75 /*
  76  * Unions are fairly easy to lay out ;)
  77  */
  78 static void lay_out_union(struct symbol *sym, struct struct_union_info *info)
  79 {
  80         examine_symbol_type(sym);
  81
  82         // Unnamed bitfields do not affect alignment.
  83         if (sym->ident || !is_bitfield_type(sym)) {
  84                 if (sym->ctype.alignment > info->max_align)
  85                         info->max_align = sym->ctype.alignment;
  86         }
  87
  88         if (sym->bit_size > info->bit_size)
  89                 info->bit_size = sym->bit_size;
  90
  91         sym->offset = 0;
  92 }
  93
  94 static int bitfield_base_size(struct symbol *sym)
  95 {
  96         if (sym->type == SYM_NODE)
  97                 sym = sym->ctype.base_type;
  98         if (sym->type == SYM_BITFIELD)
  99                 sym = sym->ctype.base_type;
 100         return sym->bit_size;
 101 }
 102
 103 /*
 104  * Structures are a bit more interesting to lay out
 105  */
 106 static void lay_out_struct(struct symbol *sym, struct struct_union_info *info)
 107 {
 108         unsigned long bit_size, align_bit_mask;
 109         int base_size;
 110
 111         examine_symbol_type(sym);
 112
 113         // Unnamed bitfields do not affect alignment.
 114         if (sym->ident || !is_bitfield_type(sym)) {
 115                 if (sym->ctype.alignment > info->max_align)
 116                         info->max_align = sym->ctype.alignment;
 117         }
 118
 119         bit_size = info->bit_size;
 120         base_size = sym->bit_size;
 121
 122         /*
 123          * Unsized arrays cause us to not align the resulting
 124          * structure size
 125          */
 126         if (base_size < 0) {
 127                 info->align_size = 0;
 128                 base_size = 0;
 129         }
 130
 131         align_bit_mask = (sym->ctype.alignment << 3) - 1;
 132
 133         /*
 134          * Bitfields have some very special rules..
 135          */
 136         if (is_bitfield_type (sym)) {
 137                 unsigned long bit_offset = bit_size & align_bit_mask;
 138                 int room = bitfield_base_size(sym) - bit_offset;
 139                 // Zero-width fields just fill up the unit.
 140                 int width = base_size ? : (bit_offset ? room : 0);
 141
 142                 if (width > room) {
 143                         bit_size = (bit_size + align_bit_mask) & ~align_bit_mask;
 144                         bit_offset = 0;
 145                 }
 146                 sym->offset = (bit_size - bit_offset) >> 3;
 147                 sym->bit_offset = bit_offset;
 148                 sym->ctype.base_type->bit_offset = bit_offset;
 149                 info->bit_size = bit_size + width;
 150                 // warning (sym->pos, "bitfield: offset=%d:%d  size=:%d", sym->offset, sym->bit_offset, width);
 151
 152                 return;
 153         }
 154
 155         /*
 156          * Otherwise, just align it right and add it up..
 157          */
 158         bit_size = (bit_size + align_bit_mask) & ~align_bit_mask;
 159         sym->offset = bit_size >> 3;
 160
 161         info->bit_size = bit_size + base_size;
 162         // warning (sym->pos, "regular: offset=%d", sym->offset);
 163 }
 164
 165 static struct symbol * examine_struct_union_type(struct symbol *sym, int advance)
 166 {
 167         struct struct_union_info info = {
 168                 .max_align = 1,
 169                 .bit_size = 0,
 170                 .align_size = 1
 171         };
 172         unsigned long bit_size, bit_align;
 173         void (*fn)(struct symbol *, struct struct_union_info *);
 174         struct symbol *member;
 175
 176         fn = advance ? lay_out_struct : lay_out_union;
 177         FOR_EACH_PTR(sym->symbol_list, member) {
 178                 fn(member, &info);
 179         } END_FOR_EACH_PTR(member);
 180
 181         if (!sym->ctype.alignment)
 182                 sym->ctype.alignment = info.max_align;
 183         bit_size = info.bit_size;
 184         if (info.align_size) {
 185                 bit_align = (sym->ctype.alignment << 3)-1;
 186                 bit_size = (bit_size + bit_align) & ~bit_align;
 187         }
 188         sym->bit_size = bit_size;
 189         return sym;
 190 }
 191
 192 static struct symbol *examine_base_type(struct symbol *sym)
 193 {
 194         struct symbol *base_type;
 195
 196         /* Check the base type */
 197         base_type = examine_symbol_type(sym->ctype.base_type);
 198         if (!base_type || base_type->type == SYM_PTR)
 199                 return base_type;
 200         sym->ctype.as |= base_type->ctype.as;
 201         sym->ctype.modifiers |= base_type->ctype.modifiers & MOD_PTRINHERIT;
 202         concat_ptr_list((struct ptr_list *)base_type->ctype.contexts,
 203                         (struct ptr_list **)&sym->ctype.contexts);
 204         if (base_type->type == SYM_NODE) {
 205                 base_type = base_type->ctype.base_type;
 206                 sym->ctype.base_type = base_type;
 207         }
 208         return base_type;
 209 }
 210
 211 static struct symbol * examine_array_type(struct symbol *sym)
 212 {
 213         struct symbol *base_type = examine_base_type(sym);
 214         unsigned long bit_size, alignment;
 215
 216         if (!base_type)
 217                 return sym;
 218         bit_size = base_type->bit_size * get_expression_value(sym->array_size);
 219         if (!sym->array_size || sym->array_size->type != EXPR_VALUE)
 220                 bit_size = -1;
 221         alignment = base_type->ctype.alignment;
 222         if (!sym->ctype.alignment)
 223                 sym->ctype.alignment = alignment;
 224         sym->bit_size = bit_size;
 225         return sym;
 226 }
 227
 228 static struct symbol *examine_bitfield_type(struct symbol *sym)
 229 {
 230         struct symbol *base_type = examine_base_type(sym);
 231         unsigned long bit_size, alignment, modifiers;
 232
 233         if (!base_type)
 234                 return sym;
 235         bit_size = base_type->bit_size;
 236         if (sym->bit_size > bit_size)
 237                 warning(sym->pos, "impossible field-width, %d, for this type",  sym->bit_size);
 238
 239         alignment = base_type->ctype.alignment;
 240         if (!sym->ctype.alignment)
 241                 sym->ctype.alignment = alignment;
 242         modifiers = base_type->ctype.modifiers;
 243
 244         /* Bitfields are unsigned, unless the base type was explicitly signed */
 245         if (!(modifiers & MOD_EXPLICITLY_SIGNED))
 246                 modifiers = (modifiers & ~MOD_SIGNED) | MOD_UNSIGNED;
 247         sym->ctype.modifiers |= modifiers & MOD_SIGNEDNESS;
 248         return sym;
 249 }
 250
 251 /*
 252  * "typeof" will have to merge the types together
 253  */
 254 void merge_type(struct symbol *sym, struct symbol *base_type)
 255 {
 256         sym->ctype.as |= base_type->ctype.as;
 257         sym->ctype.modifiers |= (base_type->ctype.modifiers & ~MOD_STORAGE);
 258         concat_ptr_list((struct ptr_list *)base_type->ctype.contexts,
 259                         (struct ptr_list **)&sym->ctype.contexts);
 260         sym->ctype.base_type = base_type->ctype.base_type;
 261         if (sym->ctype.base_type->type == SYM_NODE)
 262                 merge_type(sym, sym->ctype.base_type);
 263 }
 264
 265 static int count_array_initializer(struct symbol *t, struct expression *expr)
 266 {
 267         int nr = 0;
 268         int is_char = 0;
 269
 270         /*
 271          * Arrays of character types are special; they can be initialized by
 272          * string literal _or_ by string literal in braces.  The latter means
 273          * that with T x[] = {<string literal>} number of elements in x depends
 274          * on T - if it's a character type, we get the length of string literal
 275          * (including NUL), otherwise we have one element here.
 276          */
 277         if (t->ctype.base_type == &int_type && t->ctype.modifiers & MOD_CHAR)
 278                 is_char = 1;
 279
 280         switch (expr->type) {
 281         case EXPR_INITIALIZER: {
 282                 struct expression *entry;
 283                 int count = 0;
 284                 int str_len = 0;
 285                 FOR_EACH_PTR(expr->expr_list, entry) {
 286                         count++;
 287                         switch (entry->type) {
 288                         case EXPR_INDEX:
 289                                 if (entry->idx_to >= nr)
 290                                         nr = entry->idx_to+1;
 291                                 break;
 292                         case EXPR_STRING:
 293                                 if (is_char)
 294                                         str_len = entry->string->length;
 295                         default:
 296                                 nr++;
 297                         }
 298                 } END_FOR_EACH_PTR(entry);
 299                 if (count == 1 && str_len)
 300                         nr = str_len;
 301                 break;
 302         }
 303         case EXPR_STRING:
 304                 if (is_char)
 305                         nr = expr->string->length;
 306         default:
 307                 break;
 308         }
 309         return nr;
 310 }
 311
 312 static struct symbol * examine_node_type(struct symbol *sym)
 313 {
 314         struct symbol *base_type = examine_base_type(sym);
 315         int bit_size;
 316         unsigned long alignment, modifiers;
 317
 318         /* SYM_NODE - figure out what the type of the node was.. */
 319         modifiers = sym->ctype.modifiers;
 320
 321         bit_size = 0;
 322         alignment = 0;
 323         if (!base_type)
 324                 return sym;
 325
 326         bit_size = base_type->bit_size;
 327         alignment = base_type->ctype.alignment;
 328
 329         /* Pick up signedness information into the node */
 330         sym->ctype.modifiers |= (MOD_SIGNEDNESS & base_type->ctype.modifiers);
 331
 332         if (!sym->ctype.alignment)
 333                 sym->ctype.alignment = alignment;
 334
 335         /* Unsized array? The size might come from the initializer.. */
 336         if (bit_size < 0 && base_type->type == SYM_ARRAY && sym->initializer) {
 337                 struct symbol *node_type = base_type->ctype.base_type;
 338                 int count = count_array_initializer(node_type, sym->initializer);
 339
 340                 if (node_type && node_type->bit_size >= 0)
 341                         bit_size = node_type->bit_size * count;
 342         }
 343
 344         sym->bit_size = bit_size;
 345         return sym;
 346 }
 347
 348 static struct symbol *examine_enum_type(struct symbol *sym)
 349 {
 350         struct symbol *base_type = examine_base_type(sym);
 351
 352         sym->ctype.modifiers |= (base_type->ctype.modifiers & MOD_SIGNEDNESS);
 353         sym->bit_size = bits_in_enum;
 354         if (base_type->bit_size > sym->bit_size)
 355                 sym->bit_size = base_type->bit_size;
 356         sym->ctype.alignment = enum_alignment;
 357         if (base_type->ctype.alignment > sym->ctype.alignment)
 358                 sym->ctype.alignment = base_type->ctype.alignment;
 359         return sym;
 360 }
 361
 362 static struct symbol *examine_pointer_type(struct symbol *sym)
 363 {
 364         /*
 365          * We need to set the pointer size first, and
 366          * examine the thing we point to only afterwards.
 367          * That's because this pointer type may end up
 368          * being needed for the base type size evaluation.
 369          */
 370         if (!sym->bit_size)
 371                 sym->bit_size = bits_in_pointer;
 372         if (!sym->ctype.alignment)
 373                 sym->ctype.alignment = pointer_alignment;
 374         return sym;
 375 }
 376
 377 /*
 378  * Fill in type size and alignment information for
 379  * regular SYM_TYPE things.
 380  */
 381 struct symbol *examine_symbol_type(struct symbol * sym)
 382 {
 383         if (!sym)
 384                 return sym;
 385
 386         /* Already done? */
 387         if (sym->examined)
 388                 return sym;
 389         sym->examined = 1;
 390
 391         switch (sym->type) {
 392         case SYM_FN:
 393         case SYM_NODE:
 394                 return examine_node_type(sym);
 395         case SYM_ARRAY:
 396                 return examine_array_type(sym);
 397         case SYM_STRUCT:
 398                 return examine_struct_union_type(sym, 1);
 399         case SYM_UNION:
 400                 return examine_struct_union_type(sym, 0);
 401         case SYM_PTR:
 402                 return examine_pointer_type(sym);
 403         case SYM_ENUM:
 404                 return examine_enum_type(sym);
 405         case SYM_BITFIELD:
 406                 return examine_bitfield_type(sym);
 407         case SYM_BASETYPE:
 408                 /* Size and alignment had better already be set up */
 409                 return sym;
 410         case SYM_TYPEOF: {
 411                 struct symbol *base = evaluate_expression(sym->initializer);
 412                 if (base) {
 413                         if (is_bitfield_type(base))
 414                                 warning(base->pos, "typeof applied to bitfield type");
 415                         if (base->type == SYM_NODE)
 416                                 base = base->ctype.base_type;
 417                         sym->type = SYM_NODE;
 418                         sym->ctype.modifiers = 0;
 419                         sym->ctype.base_type = base;
 420                         return examine_node_type(sym);
 421                 }
 422                 break;
 423         }
 424         case SYM_PREPROCESSOR:
 425                 sparse_error(sym->pos, "ctype on preprocessor command? (%s)", show_ident(sym->ident));
 426                 return NULL;
 427         case SYM_UNINITIALIZED:
 428                 sparse_error(sym->pos, "ctype on uninitialized symbol %p", sym);
 429                 return NULL;
 430         case SYM_RESTRICT:
 431                 examine_base_type(sym);
 432                 return sym;
 433         case SYM_FOULED:
 434                 examine_base_type(sym);
 435                 return sym;
 436         default:
 437                 sparse_error(sym->pos, "Examining unknown symbol type %d", sym->type);
 438                 break;
 439         }
 440         return sym;
 441 }
 442
 443 const char* get_type_name(enum type type)
 444 {
 445         const char *type_lookup[] = {
 446         [SYM_UNINITIALIZED] = "uninitialized",
 447         [SYM_PREPROCESSOR] = "preprocessor",
 448         [SYM_BASETYPE] = "basetype",
 449         [SYM_NODE] = "node",
 450         [SYM_PTR] = "pointer",
 451         [SYM_FN] = "function",
 452         [SYM_ARRAY] = "array",
 453         [SYM_STRUCT] = "struct",
 454         [SYM_UNION] = "union",
 455         [SYM_ENUM] = "enum",
 456         [SYM_TYPEDEF] = "typedef",
 457         [SYM_TYPEOF] = "typeof",
 458         [SYM_MEMBER] = "member",
 459         [SYM_BITFIELD] = "bitfield",
 460         [SYM_LABEL] = "label",
 461         [SYM_RESTRICT] = "restrict",
 462         [SYM_FOULED] = "fouled",
 463         [SYM_KEYWORD] = "keyword",
 464         [SYM_BAD] = "bad"};
 465
 466         if (type <= SYM_BAD)
 467                 return type_lookup[type];
 468         else
 469                 return NULL;
 470 }
 471
 472 struct symbol *examine_pointer_target(struct symbol *sym)
 473 {
 474         return examine_base_type(sym);
 475 }
 476
 477 static struct symbol_list *restr, *fouled;
 478
 479 void create_fouled(struct symbol *type)
 480 {
 481         if (type->bit_size < bits_in_int) {
 482                 struct symbol *new = alloc_symbol(type->pos, type->type);
 483                 *new = *type;
 484                 new->bit_size = bits_in_int;
 485                 new->type = SYM_FOULED;
 486                 new->ctype.base_type = type;
 487                 add_symbol(&restr, type);
 488                 add_symbol(&fouled, new);
 489         }
 490 }
 491
 492 struct symbol *befoul(struct symbol *type)
 493 {
 494         struct symbol *t1, *t2;
 495         while (type->type == SYM_NODE)
 496                 type = type->ctype.base_type;
 497         PREPARE_PTR_LIST(restr, t1);
 498         PREPARE_PTR_LIST(fouled, t2);
 499         for (;;) {
 500                 if (t1 == type)
 501                         return t2;
 502                 if (!t1)
 503                         break;
 504                 NEXT_PTR_LIST(t1);
 505                 NEXT_PTR_LIST(t2);
 506         }
 507         FINISH_PTR_LIST(t2);
 508         FINISH_PTR_LIST(t1);
 509         return NULL;
 510 }
 511
 512 void check_declaration(struct symbol *sym)
 513 {
 514         int warned = 0;
 515         struct symbol *next = sym;
 516
 517         while ((next = next->next_id) != NULL) {
 518                 if (next->namespace != sym->namespace)
 519                         continue;
 520                 if (sym->scope == next->scope) {
 521                         sym->same_symbol = next;
 522                         return;
 523                 }
 524                 if (sym->ctype.modifiers & next->ctype.modifiers & MOD_EXTERN) {
 525                         sym->same_symbol = next;
 526                         return;
 527                 }
 528
 529                 if (!Wshadow || warned)
 530                         continue;
 531                 if (get_sym_type(next) == SYM_FN)
 532                         continue;
 533                 warned = 1;
 534                 warning(sym->pos, "symbol '%s' shadows an earlier one", show_ident(sym->ident));
 535                 info(next->pos, "originally declared here");
 536         }
 537 }
 538
 539 void bind_symbol(struct symbol *sym, struct ident *ident, enum namespace ns)
 540 {
 541         struct scope *scope;
 542         if (sym->bound) {
 543                 sparse_error(sym->pos, "internal error: symbol type already bound");
 544                 return;
 545         }
 546         if (ident->reserved && (ns & (NS_TYPEDEF | NS_STRUCT | NS_LABEL | NS_SYMBOL))) {
 547                 sparse_error(sym->pos, "Trying to use reserved word '%s' as identifier", show_ident(ident));
 548                 return;
 549         }
 550         sym->namespace = ns;
 551         sym->next_id = ident->symbols;
 552         ident->symbols = sym;
 553         if (sym->ident && sym->ident != ident)
 554                 warning(sym->pos, "Symbol '%s' already bound", show_ident(sym->ident));
 555         sym->ident = ident;
 556         sym->bound = 1;
 557
 558         scope = block_scope;
 559         if (ns == NS_SYMBOL && toplevel(scope)) {
 560                 unsigned mod = MOD_ADDRESSABLE | MOD_TOPLEVEL;
 561                 scope = global_scope;
 562                 if (sym->ctype.modifiers & MOD_STATIC) {
 563                         scope = file_scope;
 564                         mod = MOD_TOPLEVEL;
 565                 }
 566                 sym->ctype.modifiers |= mod;
 567         }
 568         if (ns == NS_MACRO)
 569                 scope = file_scope;
 570         if (ns == NS_LABEL)
 571                 scope = function_scope;
 572         bind_scope(sym, scope);
 573 }
 574
 575 struct symbol *create_symbol(int stream, const char *name, int type, int namespace)
 576 {
 577         struct token *token = built_in_token(stream, name);
 578         struct symbol *sym = alloc_symbol(token->pos, type);
 579
 580         bind_symbol(sym, token->ident, namespace);
 581         return sym;
 582 }
 583
 584 static int evaluate_to_integer(struct expression *expr)
 585 {
 586         expr->ctype = &int_ctype;
 587         return 1;
 588 }
 589
 590 static int evaluate_expect(struct expression *expr)
 591 {
 592         /* Should we evaluate it to return the type of the first argument? */
 593         expr->ctype = &int_ctype;
 594         return 1;
 595 }
 596
 597 static int arguments_choose(struct expression *expr)
 598 {
 599         struct expression_list *arglist = expr->args;
 600         struct expression *arg;
 601         int i = 0;
 602
 603         FOR_EACH_PTR (arglist, arg) {
 604                 if (!evaluate_expression(arg))
 605                         return 0;
 606                 i++;
 607         } END_FOR_EACH_PTR(arg);
 608         if (i < 3) {
 609                 sparse_error(expr->pos,
 610                              "not enough arguments for __builtin_choose_expr");
 611                 return 0;
 612         } if (i > 3) {
 613                 sparse_error(expr->pos,
 614                              "too many arguments for __builtin_choose_expr");
 615                 return 0;
 616         }
 617         return 1;
 618 }
 619
 620 static int evaluate_choose(struct expression *expr)
 621 {
 622         struct expression_list *list = expr->args;
 623         struct expression *arg, *args[3];
 624         int n = 0;
 625
 626         /* there will be exactly 3; we'd already verified that */
 627         FOR_EACH_PTR(list, arg) {
 628                 args[n++] = arg;
 629         } END_FOR_EACH_PTR(arg);
 630
 631         *expr = get_expression_value(args[0]) ? *args[1] : *args[2];
 632
 633         return 1;
 634 }
 635
 636 static int expand_expect(struct expression *expr, int cost)
 637 {
 638         struct expression *arg = first_ptr_list((struct ptr_list *) expr->args);
 639
 640         if (arg)
 641                 *expr = *arg;
 642         return 0;
 643 }
 644
 645 /*
 646  * __builtin_warning() has type "int" and always returns 1,
 647  * so that you can use it in conditionals or whatever
 648  */
 649 static int expand_warning(struct expression *expr, int cost)
 650 {
 651         struct expression *arg;
 652         struct expression_list *arglist = expr->args;
 653
 654         FOR_EACH_PTR (arglist, arg) {
 655                 /*
 656                  * Constant strings get printed out as a warning. By the
 657                  * time we get here, the EXPR_STRING has been fully
 658                  * evaluated, so by now it's an anonymous symbol with a
 659                  * string initializer.
 660                  *
 661                  * Just for the heck of it, allow any constant string
 662                  * symbol.
 663                  */
 664                 if (arg->type == EXPR_SYMBOL) {
 665                         struct symbol *sym = arg->symbol;
 666                         if (sym->initializer && sym->initializer->type == EXPR_STRING) {
 667                                 struct string *string = sym->initializer->string;
 668                                 warning(expr->pos, "%*s", string->length-1, string->data);
 669                         }
 670                         continue;
 671                 }
 672
 673                 /*
 674                  * Any other argument is a conditional. If it's
 675                  * non-constant, or it is false, we exit and do
 676                  * not print any warning.
 677                  */
 678                 if (arg->type != EXPR_VALUE)
 679                         goto out;
 680                 if (!arg->value)
 681                         goto out;
 682         } END_FOR_EACH_PTR(arg);
 683 out:
 684         expr->type = EXPR_VALUE;
 685         expr->value = 1;
 686         expr->taint = 0;
 687         return 0;
 688 }
 689
 690 /*
 691  * Type and storage class keywords need to have the symbols
 692  * created for them, so that the parser can have enough semantic
 693  * information to do parsing.
 694  *
 695  * "double" == "long float", "long double" == "long long float"
 696  */
 697 static struct sym_init {
 698         const char *name;
 699         struct symbol *base_type;
 700         unsigned int modifiers;
 701         struct symbol_op *op;
 702 } symbol_init_table[] = {
 703         /* Storage class */
 704         { "auto",       NULL,           MOD_AUTO },
 705         { "register",   NULL,           MOD_REGISTER },
 706         { "static",     NULL,           MOD_STATIC },
 707         { "extern",     NULL,           MOD_EXTERN },
 708
 709         /* Type specifiers */
 710         { "void",       &void_ctype,    0 },
 711         { "char",       NULL,           MOD_CHAR },
 712         { "short",      NULL,           MOD_SHORT },
 713         { "int",        &int_type,      0 },
 714         { "long",       NULL,           MOD_LONG },
 715         { "float",      &fp_type,       0 },
 716         { "double",     &fp_type,       MOD_LONG },
 717         { "signed",     NULL,           MOD_SIGNED | MOD_EXPLICITLY_SIGNED },
 718         { "__signed",   NULL,           MOD_SIGNED | MOD_EXPLICITLY_SIGNED },
 719         { "__signed__", NULL,           MOD_SIGNED | MOD_EXPLICITLY_SIGNED },
 720         { "unsigned",   NULL,           MOD_UNSIGNED },
 721         { "__label__",  &label_ctype,   MOD_LABEL | MOD_UNSIGNED },
 722         { "_Bool",      &bool_ctype,    MOD_UNSIGNED },
 723
 724         /* Predeclared types */
 725         { "__builtin_va_list", &int_type, 0 },
 726
 727         { NULL,         NULL,           0 }
 728 };
 729
 730 static struct symbol_op constant_p_op = {
 731         .evaluate = evaluate_to_integer,
 732         .expand = expand_constant_p
 733 };
 734
 735 static struct symbol_op safe_p_op = {
 736         .evaluate = evaluate_to_integer,
 737         .expand = expand_safe_p
 738 };
 739
 740 static struct symbol_op warning_op = {
 741         .evaluate = evaluate_to_integer,
 742         .expand = expand_warning
 743 };
 744
 745 static struct symbol_op expect_op = {
 746         .evaluate = evaluate_expect,
 747         .expand = expand_expect
 748 };
 749
 750 static struct symbol_op choose_op = {
 751         .evaluate = evaluate_choose,
 752         .args = arguments_choose,
 753 };
 754
 755 /*
 756  * Builtin functions
 757  */
 758 static struct symbol builtin_fn_type = { .type = SYM_FN /* , .variadic =1 */ };
 759 static struct sym_init eval_init_table[] = {
 760         { "__builtin_constant_p", &builtin_fn_type, MOD_TOPLEVEL, &constant_p_op },
 761         { "__builtin_safe_p", &builtin_fn_type, MOD_TOPLEVEL, &safe_p_op },
 762         { "__builtin_warning", &builtin_fn_type, MOD_TOPLEVEL, &warning_op },
 763         { "__builtin_expect", &builtin_fn_type, MOD_TOPLEVEL, &expect_op },
 764         { "__builtin_choose_expr", &builtin_fn_type, MOD_TOPLEVEL, &choose_op },
 765         { NULL,         NULL,           0 }
 766 };
 767
 768
 769 /*
 770  * Abstract types
 771  */
 772 struct symbol   int_type,
 773                 fp_type;
 774
 775 /*
 776  * C types (i.e. actual instances that the abstract types
 777  * can map onto)
 778  */
 779 struct symbol   bool_ctype, void_ctype, type_ctype,
 780                 char_ctype, schar_ctype, uchar_ctype,
 781                 short_ctype, sshort_ctype, ushort_ctype,
 782                 int_ctype, sint_ctype, uint_ctype,
 783                 long_ctype, slong_ctype, ulong_ctype,
 784                 llong_ctype, sllong_ctype, ullong_ctype,
 785                 float_ctype, double_ctype, ldouble_ctype,
 786                 string_ctype, ptr_ctype, lazy_ptr_ctype,
 787                 incomplete_ctype, label_ctype, bad_ctype,
 788                 null_ctype;
 789
 790 struct symbol   zero_int;
 791
 792 #define __INIT_IDENT(str, res) { .len = sizeof(str)-1, .name = str, .reserved = res }
 793 #define __IDENT(n,str,res) \
 794         struct ident n  = __INIT_IDENT(str,res)
 795
 796 #include "ident-list.h"
 797
 798 void init_symbols(void)
 799 {
 800         int stream = init_stream("builtin", -1, includepath);
 801         struct sym_init *ptr;
 802
 803 #define __IDENT(n,str,res) \
 804         hash_ident(&n)
 805 #include "ident-list.h"
 806
 807         init_parser(stream);
 808         for (ptr = symbol_init_table; ptr->name; ptr++) {
 809                 struct symbol *sym;
 810                 sym = create_symbol(stream, ptr->name, SYM_NODE, NS_TYPEDEF);
 811                 sym->ident->reserved = 1;
 812                 sym->ctype.base_type = ptr->base_type;
 813                 sym->ctype.modifiers = ptr->modifiers;
 814         }
 815
 816         builtin_fn_type.variadic = 1;
 817         for (ptr = eval_init_table; ptr->name; ptr++) {
 818                 struct symbol *sym;
 819                 sym = create_symbol(stream, ptr->name, SYM_NODE, NS_SYMBOL);
 820                 sym->ctype.base_type = ptr->base_type;
 821                 sym->ctype.modifiers = ptr->modifiers;
 822                 sym->op = ptr->op;
 823         }
 824 }
 825
 826 #define MOD_ESIGNED (MOD_SIGNED | MOD_EXPLICITLY_SIGNED)
 827 #define MOD_LL (MOD_LONG | MOD_LONGLONG)
 828 static const struct ctype_declare {
 829         struct symbol *ptr;
 830         enum type type;
 831         unsigned long modifiers;
 832         int *bit_size;
 833         int *maxalign;
 834         struct symbol *base_type;
 835 } ctype_declaration[] = {
 836         { &bool_ctype,      SYM_BASETYPE, MOD_UNSIGNED,             &bits_in_bool,           &max_int_alignment, &int_type },
 837         { &void_ctype,      SYM_BASETYPE, 0,                        NULL,                    NULL,               NULL },
 838         { &type_ctype,      SYM_BASETYPE, MOD_TYPE,                 NULL,                    NULL,               NULL },
 839         { &incomplete_ctype,SYM_BASETYPE, 0,                        NULL,                    NULL,               NULL },
 840         { &bad_ctype,       SYM_BASETYPE, 0,                        NULL,                    NULL,               NULL },
 841
 842         { &char_ctype,      SYM_BASETYPE, MOD_SIGNED | MOD_CHAR,    &bits_in_char,           &max_int_alignment, &int_type },
 843         { &schar_ctype,     SYM_BASETYPE, MOD_ESIGNED | MOD_CHAR,   &bits_in_char,           &max_int_alignment, &int_type },
 844         { &uchar_ctype,     SYM_BASETYPE, MOD_UNSIGNED | MOD_CHAR,  &bits_in_char,           &max_int_alignment, &int_type },
 845         { &short_ctype,     SYM_BASETYPE, MOD_SIGNED | MOD_SHORT,   &bits_in_short,          &max_int_alignment, &int_type },
 846         { &sshort_ctype,    SYM_BASETYPE, MOD_ESIGNED | MOD_SHORT,  &bits_in_short,          &max_int_alignment, &int_type },
 847         { &ushort_ctype,    SYM_BASETYPE, MOD_UNSIGNED | MOD_SHORT, &bits_in_short,          &max_int_alignment, &int_type },
 848         { &int_ctype,       SYM_BASETYPE, MOD_SIGNED,               &bits_in_int,            &max_int_alignment, &int_type },
 849         { &sint_ctype,      SYM_BASETYPE, MOD_ESIGNED,              &bits_in_int,            &max_int_alignment, &int_type },
 850         { &uint_ctype,      SYM_BASETYPE, MOD_UNSIGNED,             &bits_in_int,            &max_int_alignment, &int_type },
 851         { &long_ctype,      SYM_BASETYPE, MOD_SIGNED | MOD_LONG,    &bits_in_long,           &max_int_alignment, &int_type },
 852         { &slong_ctype,     SYM_BASETYPE, MOD_ESIGNED | MOD_LONG,   &bits_in_long,           &max_int_alignment, &int_type },
 853         { &ulong_ctype,     SYM_BASETYPE, MOD_UNSIGNED | MOD_LONG,  &bits_in_long,           &max_int_alignment, &int_type },
 854         { &llong_ctype,     SYM_BASETYPE, MOD_SIGNED | MOD_LL,      &bits_in_longlong,       &max_int_alignment, &int_type },
 855         { &sllong_ctype,    SYM_BASETYPE, MOD_ESIGNED | MOD_LL,     &bits_in_longlong,       &max_int_alignment, &int_type },
 856         { &ullong_ctype,    SYM_BASETYPE, MOD_UNSIGNED | MOD_LL,    &bits_in_longlong,       &max_int_alignment, &int_type },
 857
 858         { &float_ctype,     SYM_BASETYPE,  0,                       &bits_in_float,          &max_fp_alignment,  &fp_type },
 859         { &double_ctype,    SYM_BASETYPE, MOD_LONG,                 &bits_in_double,         &max_fp_alignment,  &fp_type },
 860         { &ldouble_ctype,   SYM_BASETYPE, MOD_LONG | MOD_LONGLONG,  &bits_in_longdouble,     &max_fp_alignment,  &fp_type },
 861
 862         { &string_ctype,    SYM_PTR,      0,                        &bits_in_pointer,        &pointer_alignment, &char_ctype },
 863         { &ptr_ctype,       SYM_PTR,      0,                        &bits_in_pointer,        &pointer_alignment, &void_ctype },
 864         { &null_ctype,      SYM_PTR,      0,                        &bits_in_pointer,        &pointer_alignment, &void_ctype },
 865         { &label_ctype,     SYM_PTR,      0,                        &bits_in_pointer,        &pointer_alignment, &void_ctype },
 866         { &lazy_ptr_ctype,  SYM_PTR,      0,                        &bits_in_pointer,        &pointer_alignment, &void_ctype },
 867         { NULL, }
 868 };
 869 #undef MOD_LL
 870 #undef MOD_ESIGNED
 871
 872 void init_ctype(void)
 873 {
 874         const struct ctype_declare *ctype;
 875
 876         for (ctype = ctype_declaration ; ctype->ptr; ctype++) {
 877                 struct symbol *sym = ctype->ptr;
 878                 unsigned long bit_size = ctype->bit_size ? *ctype->bit_size : -1;
 879                 unsigned long maxalign = ctype->maxalign ? *ctype->maxalign : 0;
 880                 unsigned long alignment = (bit_size + 7) >> 3;
 881
 882                 if (alignment > maxalign)
 883                         alignment = maxalign;
 884                 sym->type = ctype->type;
 885                 sym->bit_size = bit_size;
 886                 sym->ctype.alignment = alignment;
 887                 sym->ctype.base_type = ctype->base_type;
 888                 sym->ctype.modifiers = ctype->modifiers;
 889         }
 890 }