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