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