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 NULL;
  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 = bytes_to_bits(sym->ctype.alignment) - 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 = bits_to_bytes(bit_size - bit_offset);
 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 = bits_to_bytes(bit_size);
 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 = bytes_to_bits(sym->ctype.alignment)-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;
 317
 318         /* SYM_NODE - figure out what the type of the node was.. */
 319         bit_size = 0;
 320         alignment = 0;
 321         if (!base_type)
 322                 return sym;
 323
 324         bit_size = base_type->bit_size;
 325         alignment = base_type->ctype.alignment;
 326
 327         /* Pick up signedness information into the node */
 328         sym->ctype.modifiers |= (MOD_SIGNEDNESS & base_type->ctype.modifiers);
 329
 330         if (!sym->ctype.alignment)
 331                 sym->ctype.alignment = alignment;
 332
 333         /* Unsized array? The size might come from the initializer.. */
 334         if (bit_size < 0 && base_type->type == SYM_ARRAY && sym->initializer) {
 335                 struct symbol *node_type = base_type->ctype.base_type;
 336                 int count = count_array_initializer(node_type, sym->initializer);
 337
 338                 if (node_type && node_type->bit_size >= 0)
 339                         bit_size = node_type->bit_size * count;
 340         }
 341
 342         sym->bit_size = bit_size;
 343         return sym;
 344 }
 345
 346 static struct symbol *examine_enum_type(struct symbol *sym)
 347 {
 348         struct symbol *base_type = examine_base_type(sym);
 349
 350         sym->ctype.modifiers |= (base_type->ctype.modifiers & MOD_SIGNEDNESS);
 351         sym->bit_size = bits_in_enum;
 352         if (base_type->bit_size > sym->bit_size)
 353                 sym->bit_size = base_type->bit_size;
 354         sym->ctype.alignment = enum_alignment;
 355         if (base_type->ctype.alignment > sym->ctype.alignment)
 356                 sym->ctype.alignment = base_type->ctype.alignment;
 357         return sym;
 358 }
 359
 360 static struct symbol *examine_pointer_type(struct symbol *sym)
 361 {
 362         /*
 363          * We need to set the pointer size first, and
 364          * examine the thing we point to only afterwards.
 365          * That's because this pointer type may end up
 366          * being needed for the base type size evaluation.
 367          */
 368         if (!sym->bit_size)
 369                 sym->bit_size = bits_in_pointer;
 370         if (!sym->ctype.alignment)
 371                 sym->ctype.alignment = pointer_alignment;
 372         return sym;
 373 }
 374
 375 /*
 376  * Fill in type size and alignment information for
 377  * regular SYM_TYPE things.
 378  */
 379 struct symbol *examine_symbol_type(struct symbol * sym)
 380 {
 381         if (!sym)
 382                 return sym;
 383
 384         /* Already done? */
 385         if (sym->examined)
 386                 return sym;
 387         sym->examined = 1;
 388
 389         switch (sym->type) {
 390         case SYM_FN:
 391         case SYM_NODE:
 392                 return examine_node_type(sym);
 393         case SYM_ARRAY:
 394                 return examine_array_type(sym);
 395         case SYM_STRUCT:
 396                 return examine_struct_union_type(sym, 1);
 397         case SYM_UNION:
 398                 return examine_struct_union_type(sym, 0);
 399         case SYM_PTR:
 400                 return examine_pointer_type(sym);
 401         case SYM_ENUM:
 402                 return examine_enum_type(sym);
 403         case SYM_BITFIELD:
 404                 return examine_bitfield_type(sym);
 405         case SYM_BASETYPE:
 406                 /* Size and alignment had better already be set up */
 407                 return sym;
 408         case SYM_TYPEOF: {
 409                 struct symbol *base = evaluate_expression(sym->initializer);
 410                 if (base) {
 411                         if (is_bitfield_type(base))
 412                                 warning(base->pos, "typeof applied to bitfield type");
 413                         if (base->type == SYM_NODE)
 414                                 base = base->ctype.base_type;
 415                         sym->type = SYM_NODE;
 416                         sym->ctype.modifiers = 0;
 417                         sym->ctype.base_type = base;
 418                         return examine_node_type(sym);
 419                 }
 420                 break;
 421         }
 422         case SYM_PREPROCESSOR:
 423                 sparse_error(sym->pos, "ctype on preprocessor command? (%s)", show_ident(sym->ident));
 424                 return NULL;
 425         case SYM_UNINITIALIZED:
 426 //              sparse_error(sym->pos, "ctype on uninitialized symbol %p", sym);
 427                 return NULL;
 428         case SYM_RESTRICT:
 429                 examine_base_type(sym);
 430                 return sym;
 431         case SYM_FOULED:
 432                 examine_base_type(sym);
 433                 return sym;
 434         default:
 435                 sparse_error(sym->pos, "Examining unknown symbol type %d", sym->type);
 436                 break;
 437         }
 438         return sym;
 439 }
 440
 441 const char* get_type_name(enum type type)
 442 {
 443         const char *type_lookup[] = {
 444         [SYM_UNINITIALIZED] = "uninitialized",
 445         [SYM_PREPROCESSOR] = "preprocessor",
 446         [SYM_BASETYPE] = "basetype",
 447         [SYM_NODE] = "node",
 448         [SYM_PTR] = "pointer",
 449         [SYM_FN] = "function",
 450         [SYM_ARRAY] = "array",
 451         [SYM_STRUCT] = "struct",
 452         [SYM_UNION] = "union",
 453         [SYM_ENUM] = "enum",
 454         [SYM_TYPEDEF] = "typedef",
 455         [SYM_TYPEOF] = "typeof",
 456         [SYM_MEMBER] = "member",
 457         [SYM_BITFIELD] = "bitfield",
 458         [SYM_LABEL] = "label",
 459         [SYM_RESTRICT] = "restrict",
 460         [SYM_FOULED] = "fouled",
 461         [SYM_KEYWORD] = "keyword",
 462         [SYM_BAD] = "bad"};
 463
 464         if (type <= SYM_BAD)
 465                 return type_lookup[type];
 466         else
 467                 return NULL;
 468 }
 469
 470 struct symbol *examine_pointer_target(struct symbol *sym)
 471 {
 472         return examine_base_type(sym);
 473 }
 474
 475 static struct symbol_list *restr, *fouled;
 476
 477 void create_fouled(struct symbol *type)
 478 {
 479         if (type->bit_size < bits_in_int) {
 480                 struct symbol *new = alloc_symbol(type->pos, type->type);
 481                 *new = *type;
 482                 new->bit_size = bits_in_int;
 483                 new->type = SYM_FOULED;
 484                 new->ctype.base_type = type;
 485                 add_symbol(&restr, type);
 486                 add_symbol(&fouled, new);
 487         }
 488 }
 489
 490 struct symbol *befoul(struct symbol *type)
 491 {
 492         struct symbol *t1, *t2;
 493         while (type->type == SYM_NODE)
 494                 type = type->ctype.base_type;
 495         PREPARE_PTR_LIST(restr, t1);
 496         PREPARE_PTR_LIST(fouled, t2);
 497         for (;;) {
 498                 if (t1 == type)
 499                         return t2;
 500                 if (!t1)
 501                         break;
 502                 NEXT_PTR_LIST(t1);
 503                 NEXT_PTR_LIST(t2);
 504         }
 505         FINISH_PTR_LIST(t2);
 506         FINISH_PTR_LIST(t1);
 507         return NULL;
 508 }
 509
 510 void check_declaration(struct symbol *sym)
 511 {
 512         int warned = 0;
 513         struct symbol *next = sym;
 514
 515         while ((next = next->next_id) != NULL) {
 516                 if (next->namespace != sym->namespace)
 517                         continue;
 518                 if (sym->scope == next->scope) {
 519                         sym->same_symbol = next;
 520                         return;
 521                 }
 522                 if (sym->ctype.modifiers & next->ctype.modifiers & MOD_EXTERN) {
 523                         if ((sym->ctype.modifiers ^ next->ctype.modifiers) & MOD_INLINE)
 524                                 continue;
 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
 562                 scope = global_scope;
 563                 if (sym->ctype.modifiers & MOD_STATIC ||
 564                     is_extern_inline(sym)) {
 565                         scope = file_scope;
 566                         mod = MOD_TOPLEVEL;
 567                 }
 568                 sym->ctype.modifiers |= mod;
 569         }
 570         if (ns == NS_MACRO)
 571                 scope = file_scope;
 572         if (ns == NS_LABEL)
 573                 scope = function_scope;
 574         bind_scope(sym, scope);
 575 }
 576
 577 struct symbol *create_symbol(int stream, const char *name, int type, int namespace)
 578 {
 579         struct token *token = built_in_token(stream, name);
 580         struct symbol *sym = alloc_symbol(token->pos, type);
 581
 582         bind_symbol(sym, token->ident, namespace);
 583         return sym;
 584 }
 585
 586 static int evaluate_to_integer(struct expression *expr)
 587 {
 588         expr->ctype = &int_ctype;
 589         return 1;
 590 }
 591
 592 static int evaluate_expect(struct expression *expr)
 593 {
 594         /* Should we evaluate it to return the type of the first argument? */
 595         expr->ctype = &int_ctype;
 596         return 1;
 597 }
 598
 599 static int arguments_choose(struct expression *expr)
 600 {
 601         struct expression_list *arglist = expr->args;
 602         struct expression *arg;
 603         int i = 0;
 604
 605         FOR_EACH_PTR (arglist, arg) {
 606                 if (!evaluate_expression(arg))
 607                         return 0;
 608                 i++;
 609         } END_FOR_EACH_PTR(arg);
 610         if (i < 3) {
 611                 sparse_error(expr->pos,
 612                              "not enough arguments for __builtin_choose_expr");
 613                 return 0;
 614         } if (i > 3) {
 615                 sparse_error(expr->pos,
 616                              "too many arguments for __builtin_choose_expr");
 617                 return 0;
 618         }
 619         return 1;
 620 }
 621
 622 static int evaluate_choose(struct expression *expr)
 623 {
 624         struct expression_list *list = expr->args;
 625         struct expression *arg, *args[3];
 626         int n = 0;
 627
 628         /* there will be exactly 3; we'd already verified that */
 629         FOR_EACH_PTR(list, arg) {
 630                 args[n++] = arg;
 631         } END_FOR_EACH_PTR(arg);
 632
 633         *expr = get_expression_value(args[0]) ? *args[1] : *args[2];
 634
 635         return 1;
 636 }
 637
 638 static int expand_expect(struct expression *expr, int cost)
 639 {
 640         struct expression *arg = first_ptr_list((struct ptr_list *) expr->args);
 641
 642         if (arg)
 643                 *expr = *arg;
 644         return 0;
 645 }
 646
 647 /*
 648  * __builtin_warning() has type "int" and always returns 1,
 649  * so that you can use it in conditionals or whatever
 650  */
 651 static int expand_warning(struct expression *expr, int cost)
 652 {
 653         struct expression *arg;
 654         struct expression_list *arglist = expr->args;
 655
 656         FOR_EACH_PTR (arglist, arg) {
 657                 /*
 658                  * Constant strings get printed out as a warning. By the
 659                  * time we get here, the EXPR_STRING has been fully
 660                  * evaluated, so by now it's an anonymous symbol with a
 661                  * string initializer.
 662                  *
 663                  * Just for the heck of it, allow any constant string
 664                  * symbol.
 665                  */
 666                 if (arg->type == EXPR_SYMBOL) {
 667                         struct symbol *sym = arg->symbol;
 668                         if (sym->initializer && sym->initializer->type == EXPR_STRING) {
 669                                 struct string *string = sym->initializer->string;
 670                                 warning(expr->pos, "%*s", string->length-1, string->data);
 671                         }
 672                         continue;
 673                 }
 674
 675                 /*
 676                  * Any other argument is a conditional. If it's
 677                  * non-constant, or it is false, we exit and do
 678                  * not print any warning.
 679                  */
 680                 if (arg->type != EXPR_VALUE)
 681                         goto out;
 682                 if (!arg->value)
 683                         goto out;
 684         } END_FOR_EACH_PTR(arg);
 685 out:
 686         expr->type = EXPR_VALUE;
 687         expr->value = 1;
 688         expr->taint = 0;
 689         return 0;
 690 }
 691
 692 static struct symbol_op constant_p_op = {
 693         .evaluate = evaluate_to_integer,
 694         .expand = expand_constant_p
 695 };
 696
 697 static struct symbol_op safe_p_op = {
 698         .evaluate = evaluate_to_integer,
 699         .expand = expand_safe_p
 700 };
 701
 702 static struct symbol_op warning_op = {
 703         .evaluate = evaluate_to_integer,
 704         .expand = expand_warning
 705 };
 706
 707 static struct symbol_op expect_op = {
 708         .evaluate = evaluate_expect,
 709         .expand = expand_expect
 710 };
 711
 712 static struct symbol_op choose_op = {
 713         .evaluate = evaluate_choose,
 714         .args = arguments_choose,
 715 };
 716
 717 /*
 718  * Builtin functions
 719  */
 720 static struct symbol builtin_fn_type = { .type = SYM_FN /* , .variadic =1 */ };
 721 static struct sym_init {
 722         const char *name;
 723         struct symbol *base_type;
 724         unsigned int modifiers;
 725         struct symbol_op *op;
 726 } eval_init_table[] = {
 727         { "__builtin_constant_p", &builtin_fn_type, MOD_TOPLEVEL, &constant_p_op },
 728         { "__builtin_safe_p", &builtin_fn_type, MOD_TOPLEVEL, &safe_p_op },
 729         { "__builtin_warning", &builtin_fn_type, MOD_TOPLEVEL, &warning_op },
 730         { "__builtin_expect", &builtin_fn_type, MOD_TOPLEVEL, &expect_op },
 731         { "__builtin_choose_expr", &builtin_fn_type, MOD_TOPLEVEL, &choose_op },
 732         { NULL,         NULL,           0 }
 733 };
 734
 735
 736 /*
 737  * Abstract types
 738  */
 739 struct symbol   int_type,
 740                 fp_type;
 741
 742 /*
 743  * C types (i.e. actual instances that the abstract types
 744  * can map onto)
 745  */
 746 struct symbol   bool_ctype, void_ctype, type_ctype,
 747                 char_ctype, schar_ctype, uchar_ctype,
 748                 short_ctype, sshort_ctype, ushort_ctype,
 749                 int_ctype, sint_ctype, uint_ctype,
 750                 long_ctype, slong_ctype, ulong_ctype,
 751                 llong_ctype, sllong_ctype, ullong_ctype,
 752                 lllong_ctype, slllong_ctype, ulllong_ctype,
 753                 float_ctype, double_ctype, ldouble_ctype,
 754                 string_ctype, ptr_ctype, lazy_ptr_ctype,
 755                 incomplete_ctype, label_ctype, bad_ctype,
 756                 null_ctype;
 757
 758 struct symbol   zero_int;
 759
 760 #define __INIT_IDENT(str, res) { .len = sizeof(str)-1, .name = str, .reserved = res }
 761 #define __IDENT(n,str,res) \
 762         struct ident n  = __INIT_IDENT(str,res)
 763
 764 #include "ident-list.h"
 765
 766 void init_symbols(void)
 767 {
 768         int stream = init_stream("builtin", -1, includepath);
 769         struct sym_init *ptr;
 770
 771 #define __IDENT(n,str,res) \
 772         hash_ident(&n)
 773 #include "ident-list.h"
 774
 775         init_parser(stream);
 776
 777         builtin_fn_type.variadic = 1;
 778         for (ptr = eval_init_table; ptr->name; ptr++) {
 779                 struct symbol *sym;
 780                 sym = create_symbol(stream, ptr->name, SYM_NODE, NS_SYMBOL);
 781                 sym->ctype.base_type = ptr->base_type;
 782                 sym->ctype.modifiers = ptr->modifiers;
 783                 sym->op = ptr->op;
 784         }
 785 }
 786
 787 #define MOD_ESIGNED (MOD_SIGNED | MOD_EXPLICITLY_SIGNED)
 788 #define MOD_LL (MOD_LONG | MOD_LONGLONG)
 789 #define MOD_LLL MOD_LONGLONGLONG
 790 static const struct ctype_declare {
 791         struct symbol *ptr;
 792         enum type type;
 793         unsigned long modifiers;
 794         int *bit_size;
 795         int *maxalign;
 796         struct symbol *base_type;
 797 } ctype_declaration[] = {
 798         { &bool_ctype,      SYM_BASETYPE, MOD_UNSIGNED,             &bits_in_bool,           &max_int_alignment, &int_type },
 799         { &void_ctype,      SYM_BASETYPE, 0,                        NULL,            NULL,               NULL },
 800         { &type_ctype,      SYM_BASETYPE, MOD_TYPE,                 NULL,                    NULL,               NULL },
 801         { &incomplete_ctype,SYM_BASETYPE, 0,                        NULL,                    NULL,               NULL },
 802         { &bad_ctype,       SYM_BASETYPE, 0,                        NULL,                    NULL,               NULL },
 803
 804         { &char_ctype,      SYM_BASETYPE, MOD_SIGNED | MOD_CHAR,    &bits_in_char,           &max_int_alignment, &int_type },
 805         { &schar_ctype,     SYM_BASETYPE, MOD_ESIGNED | MOD_CHAR,   &bits_in_char,           &max_int_alignment, &int_type },
 806         { &uchar_ctype,     SYM_BASETYPE, MOD_UNSIGNED | MOD_CHAR,  &bits_in_char,           &max_int_alignment, &int_type },
 807         { &short_ctype,     SYM_BASETYPE, MOD_SIGNED | MOD_SHORT,   &bits_in_short,          &max_int_alignment, &int_type },
 808         { &sshort_ctype,    SYM_BASETYPE, MOD_ESIGNED | MOD_SHORT,  &bits_in_short,          &max_int_alignment, &int_type },
 809         { &ushort_ctype,    SYM_BASETYPE, MOD_UNSIGNED | MOD_SHORT, &bits_in_short,          &max_int_alignment, &int_type },
 810         { &int_ctype,       SYM_BASETYPE, MOD_SIGNED,               &bits_in_int,            &max_int_alignment, &int_type },
 811         { &sint_ctype,      SYM_BASETYPE, MOD_ESIGNED,              &bits_in_int,            &max_int_alignment, &int_type },
 812         { &uint_ctype,      SYM_BASETYPE, MOD_UNSIGNED,             &bits_in_int,            &max_int_alignment, &int_type },
 813         { &long_ctype,      SYM_BASETYPE, MOD_SIGNED | MOD_LONG,    &bits_in_long,           &max_int_alignment, &int_type },
 814         { &slong_ctype,     SYM_BASETYPE, MOD_ESIGNED | MOD_LONG,   &bits_in_long,           &max_int_alignment, &int_type },
 815         { &ulong_ctype,     SYM_BASETYPE, MOD_UNSIGNED | MOD_LONG,  &bits_in_long,           &max_int_alignment, &int_type },
 816         { &llong_ctype,     SYM_BASETYPE, MOD_SIGNED | MOD_LL,      &bits_in_longlong,       &max_int_alignment, &int_type },
 817         { &sllong_ctype,    SYM_BASETYPE, MOD_ESIGNED | MOD_LL,     &bits_in_longlong,       &max_int_alignment, &int_type },
 818         { &ullong_ctype,    SYM_BASETYPE, MOD_UNSIGNED | MOD_LL,    &bits_in_longlong,       &max_int_alignment, &int_type },
 819         { &lllong_ctype,    SYM_BASETYPE, MOD_SIGNED | MOD_LLL,     &bits_in_longlonglong,   &max_int_alignment, &int_type },
 820         { &slllong_ctype,   SYM_BASETYPE, MOD_ESIGNED | MOD_LLL,    &bits_in_longlonglong,   &max_int_alignment, &int_type },
 821         { &ulllong_ctype,   SYM_BASETYPE, MOD_UNSIGNED | MOD_LLL,   &bits_in_longlonglong,   &max_int_alignment, &int_type },
 822
 823         { &float_ctype,     SYM_BASETYPE,  0,                       &bits_in_float,          &max_fp_alignment,  &fp_type },
 824         { &double_ctype,    SYM_BASETYPE, MOD_LONG,                 &bits_in_double,         &max_fp_alignment,  &fp_type },
 825         { &ldouble_ctype,   SYM_BASETYPE, MOD_LONG | MOD_LONGLONG,  &bits_in_longdouble,     &max_fp_alignment,  &fp_type },
 826
 827         { &string_ctype,    SYM_PTR,      0,                        &bits_in_pointer,        &pointer_alignment, &char_ctype },
 828         { &ptr_ctype,       SYM_PTR,      0,                        &bits_in_pointer,        &pointer_alignment, &void_ctype },
 829         { &null_ctype,      SYM_PTR,      0,                        &bits_in_pointer,        &pointer_alignment, &void_ctype },
 830         { &label_ctype,     SYM_PTR,      0,                        &bits_in_pointer,        &pointer_alignment, &void_ctype },
 831         { &lazy_ptr_ctype,  SYM_PTR,      0,                        &bits_in_pointer,        &pointer_alignment, &void_ctype },
 832         { NULL, }
 833 };
 834 #undef MOD_LLL
 835 #undef MOD_LL
 836 #undef MOD_ESIGNED
 837
 838 void init_ctype(void)
 839 {
 840         const struct ctype_declare *ctype;
 841
 842         for (ctype = ctype_declaration ; ctype->ptr; ctype++) {
 843                 struct symbol *sym = ctype->ptr;
 844                 unsigned long bit_size = ctype->bit_size ? *ctype->bit_size : -1;
 845                 unsigned long maxalign = ctype->maxalign ? *ctype->maxalign : 0;
 846                 unsigned long alignment = bits_to_bytes(bit_size + bits_in_char - 1);
 847
 848                 if (alignment > maxalign)
 849                         alignment = maxalign;
 850                 sym->type = ctype->type;
 851                 sym->bit_size = bit_size;
 852                 sym->ctype.alignment = alignment;
 853                 sym->ctype.base_type = ctype->base_type;
 854                 sym->ctype.modifiers = ctype->modifiers;
 855         }
 856 }