nsz Git - cparser/blob - type.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2008 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <stdio.h>
  23 #include <assert.h>
  24
  25 #include "type_t.h"
  26 #include "symbol_t.h"
  27 #include "type_hash.h"
  28 #include "adt/error.h"
  29 #include "lang_features.h"
  30
  31 static struct obstack   _type_obst;
  32 static FILE            *out;
  33 struct obstack         *type_obst                 = &_type_obst;
  34 static int              type_visited              = 0;
  35 static bool             print_implicit_array_size = false;
  36
  37 static void intern_print_type_pre(const type_t *type, bool top);
  38 static void intern_print_type_post(const type_t *type, bool top);
  39
  40 typedef struct atomic_type_properties_t atomic_type_properties_t;
  41 struct atomic_type_properties_t {
  42         unsigned   size;              /**< type size in bytes */
  43         unsigned   alignment;         /**< type alignment in bytes */
  44         unsigned   flags;             /**< type flags from atomic_type_flag_t */
  45 };
  46
  47 static atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
  48         //ATOMIC_TYPE_INVALID = 0,
  49         [ATOMIC_TYPE_VOID] = {
  50                 .size       = 0,
  51                 .alignment  = 0,
  52                 .flags      = ATOMIC_TYPE_FLAG_NONE
  53         },
  54         [ATOMIC_TYPE_CHAR] = {
  55                 .size       = 1,
  56                 .alignment  = 1,
  57                 /* signed flag will be set when known */
  58                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  59         },
  60         [ATOMIC_TYPE_SCHAR] = {
  61                 .size       = 1,
  62                 .alignment  = 1,
  63                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  64                               | ATOMIC_TYPE_FLAG_SIGNED,
  65         },
  66         [ATOMIC_TYPE_UCHAR] = {
  67                 .size       = 1,
  68                 .alignment  = 1,
  69                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  70         },
  71         [ATOMIC_TYPE_SHORT] = {
  72                 .size       = 2,
  73                 .alignment  = 2,
  74                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  75                               | ATOMIC_TYPE_FLAG_SIGNED
  76         },
  77         [ATOMIC_TYPE_USHORT] = {
  78                 .size       = 2,
  79                 .alignment  = 2,
  80                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  81         },
  82         [ATOMIC_TYPE_INT] = {
  83                 .size       = (unsigned) -1,
  84                 .alignment  = (unsigned) -1,
  85                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  86                               | ATOMIC_TYPE_FLAG_SIGNED,
  87         },
  88         [ATOMIC_TYPE_UINT] = {
  89                 .size       = (unsigned) -1,
  90                 .alignment  = (unsigned) -1,
  91                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  92         },
  93         [ATOMIC_TYPE_LONG] = {
  94                 .size       = (unsigned) -1,
  95                 .alignment  = (unsigned) -1,
  96                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  97                               | ATOMIC_TYPE_FLAG_SIGNED,
  98         },
  99         [ATOMIC_TYPE_ULONG] = {
 100                 .size       = (unsigned) -1,
 101                 .alignment  = (unsigned) -1,
 102                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 103         },
 104         [ATOMIC_TYPE_LONGLONG] = {
 105                 .size       = (unsigned) -1,
 106                 .alignment  = (unsigned) -1,
 107                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 108                               | ATOMIC_TYPE_FLAG_SIGNED,
 109         },
 110         [ATOMIC_TYPE_ULONGLONG] = {
 111                 .size       = (unsigned) -1,
 112                 .alignment  = (unsigned) -1,
 113                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 114         },
 115         [ATOMIC_TYPE_BOOL] = {
 116                 .size       = (unsigned) -1,
 117                 .alignment  = (unsigned) -1,
 118                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 119         },
 120         [ATOMIC_TYPE_FLOAT] = {
 121                 .size       = 4,
 122                 .alignment  = (unsigned) -1,
 123                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 124                               | ATOMIC_TYPE_FLAG_SIGNED,
 125         },
 126         [ATOMIC_TYPE_DOUBLE] = {
 127                 .size       = 8,
 128                 .alignment  = (unsigned) -1,
 129                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 130                               | ATOMIC_TYPE_FLAG_SIGNED,
 131         },
 132         [ATOMIC_TYPE_LONG_DOUBLE] = {
 133                 .size       = 12,
 134                 .alignment  = (unsigned) -1,
 135                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 136                               | ATOMIC_TYPE_FLAG_SIGNED,
 137         },
 138         /* complex and imaginary types are set in init_types */
 139 };
 140
 141 void init_types(void)
 142 {
 143         obstack_init(type_obst);
 144
 145         atomic_type_properties_t *props = atomic_type_properties;
 146
 147         if (char_is_signed) {
 148                 props[ATOMIC_TYPE_CHAR].flags |= ATOMIC_TYPE_FLAG_SIGNED;
 149         }
 150
 151         unsigned int_size   = machine_size < 32 ? 2 : 4;
 152         unsigned long_size  = machine_size < 64 ? 4 : 8;
 153         unsigned llong_size = machine_size < 32 ? 4 : 8;
 154
 155         props[ATOMIC_TYPE_INT].size            = int_size;
 156         props[ATOMIC_TYPE_INT].alignment       = int_size;
 157         props[ATOMIC_TYPE_UINT].size           = int_size;
 158         props[ATOMIC_TYPE_UINT].alignment      = int_size;
 159         props[ATOMIC_TYPE_LONG].size           = long_size;
 160         props[ATOMIC_TYPE_LONG].alignment      = long_size;
 161         props[ATOMIC_TYPE_ULONG].size          = long_size;
 162         props[ATOMIC_TYPE_ULONG].alignment     = long_size;
 163         props[ATOMIC_TYPE_LONGLONG].size       = llong_size;
 164         props[ATOMIC_TYPE_LONGLONG].alignment  = llong_size;
 165         props[ATOMIC_TYPE_ULONGLONG].size      = llong_size;
 166         props[ATOMIC_TYPE_ULONGLONG].alignment = llong_size;
 167
 168         /* TODO: backend specific, need a way to query the backend for this.
 169          * The following are good settings for x86 */
 170         props[ATOMIC_TYPE_FLOAT].alignment       = 4;
 171         props[ATOMIC_TYPE_DOUBLE].alignment      = 4;
 172         props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 4;
 173         props[ATOMIC_TYPE_LONGLONG].alignment    = 4;
 174         props[ATOMIC_TYPE_ULONGLONG].alignment   = 4;
 175
 176         props[ATOMIC_TYPE_BOOL] = props[ATOMIC_TYPE_UINT];
 177 }
 178
 179 void exit_types(void)
 180 {
 181         obstack_free(type_obst, NULL);
 182 }
 183
 184 void type_set_output(FILE *stream)
 185 {
 186         out = stream;
 187 }
 188
 189 void inc_type_visited(void)
 190 {
 191         type_visited++;
 192 }
 193
 194 void print_type_qualifiers(type_qualifiers_t qualifiers)
 195 {
 196         int first = 1;
 197         if (qualifiers & TYPE_QUALIFIER_CONST) {
 198                 fputs(" const" + first,    out);
 199                 first = 0;
 200         }
 201         if (qualifiers & TYPE_QUALIFIER_VOLATILE) {
 202                 fputs(" volatile" + first, out);
 203                 first = 0;
 204         }
 205         if (qualifiers & TYPE_QUALIFIER_RESTRICT) {
 206                 fputs(" restrict" + first, out);
 207                 first = 0;
 208         }
 209 }
 210
 211 /**
 212  * Prints the name of an atomic type kinds.
 213  *
 214  * @param kind  The type kind.
 215  */
 216 static
 217 void print_atomic_kinds(atomic_type_kind_t kind)
 218 {
 219         const char *s = "INVALIDATOMIC";
 220         switch(kind) {
 221         case ATOMIC_TYPE_INVALID:                               break;
 222         case ATOMIC_TYPE_VOID:        s = "void";               break;
 223         case ATOMIC_TYPE_BOOL:        s = "_Bool";              break;
 224         case ATOMIC_TYPE_CHAR:        s = "char";               break;
 225         case ATOMIC_TYPE_SCHAR:       s = "signed char";        break;
 226         case ATOMIC_TYPE_UCHAR:       s = "unsigned char";      break;
 227         case ATOMIC_TYPE_INT:         s = "int";                break;
 228         case ATOMIC_TYPE_UINT:        s = "unsigned int";       break;
 229         case ATOMIC_TYPE_SHORT:       s = "short";              break;
 230         case ATOMIC_TYPE_USHORT:      s = "unsigned short";     break;
 231         case ATOMIC_TYPE_LONG:        s = "long";               break;
 232         case ATOMIC_TYPE_ULONG:       s = "unsigned long";      break;
 233         case ATOMIC_TYPE_LONGLONG:    s = "long long";          break;
 234         case ATOMIC_TYPE_ULONGLONG:   s = "unsigned long long"; break;
 235         case ATOMIC_TYPE_LONG_DOUBLE: s = "long double";        break;
 236         case ATOMIC_TYPE_FLOAT:       s = "float";              break;
 237         case ATOMIC_TYPE_DOUBLE:      s = "double";             break;
 238         }
 239         fputs(s, out);
 240 }
 241
 242 /**
 243  * Prints the name of an atomic type.
 244  *
 245  * @param type  The type.
 246  */
 247 static
 248 void print_atomic_type(const atomic_type_t *type)
 249 {
 250         print_type_qualifiers(type->base.qualifiers);
 251         if (type->base.qualifiers != 0)
 252                 fputc(' ', out);
 253         print_atomic_kinds(type->akind);
 254 }
 255
 256 /**
 257  * Prints the name of a complex type.
 258  *
 259  * @param type  The type.
 260  */
 261 static
 262 void print_complex_type(const complex_type_t *type)
 263 {
 264         int empty = type->base.qualifiers == 0;
 265         print_type_qualifiers(type->base.qualifiers);
 266         fputs(" _Complex " + empty, out);
 267         print_atomic_kinds(type->akind);
 268 }
 269
 270 /**
 271  * Prints the name of an imaginary type.
 272  *
 273  * @param type  The type.
 274  */
 275 static
 276 void print_imaginary_type(const imaginary_type_t *type)
 277 {
 278         int empty = type->base.qualifiers == 0;
 279         print_type_qualifiers(type->base.qualifiers);
 280         fputs(" _Imaginary " + empty, out);
 281         print_atomic_kinds(type->akind);
 282 }
 283
 284 /**
 285  * Print the first part (the prefix) of a type.
 286  *
 287  * @param type   The type to print.
 288  * @param top    true, if this is the top type, false if it's an embedded type.
 289  */
 290 static void print_function_type_pre(const function_type_t *type, bool top)
 291 {
 292         print_type_qualifiers(type->base.qualifiers);
 293         if (type->base.qualifiers != 0)
 294                 fputc(' ', out);
 295
 296
 297         intern_print_type_pre(type->return_type, false);
 298
 299         switch (type->calling_convention) {
 300         case CC_CDECL:
 301                 fputs("__cdecl ", out);
 302                 break;
 303         case CC_STDCALL:
 304                 fputs("__stdcall ", out);
 305                 break;
 306         case CC_FASTCALL:
 307                 fputs("__fastcall ", out);
 308                 break;
 309         case CC_THISCALL:
 310                 fputs("__thiscall ", out);
 311                 break;
 312         case CC_DEFAULT:
 313                 break;
 314         }
 315
 316         /* don't emit braces if we're the toplevel type... */
 317         if (!top)
 318                 fputc('(', out);
 319 }
 320
 321 /**
 322  * Print the second part (the postfix) of a type.
 323  *
 324  * @param type   The type to print.
 325  * @param top    true, if this is the top type, false if it's an embedded type.
 326  */
 327 static void print_function_type_post(const function_type_t *type,
 328                                      const scope_t *scope, bool top)
 329 {
 330         intern_print_type_post(type->return_type, false);
 331
 332         fputc('(', out);
 333         bool first = true;
 334         if (scope == NULL) {
 335                 function_parameter_t *parameter = type->parameters;
 336                 for( ; parameter != NULL; parameter = parameter->next) {
 337                         if (first) {
 338                                 first = false;
 339                         } else {
 340                                 fputs(", ", out);
 341                         }
 342                         print_type(parameter->type);
 343                 }
 344         } else {
 345                 declaration_t *parameter = scope->declarations;
 346                 for( ; parameter != NULL; parameter = parameter->next) {
 347                         if (first) {
 348                                 first = false;
 349                         } else {
 350                                 fputs(", ", out);
 351                         }
 352                         print_type_ext(parameter->type, parameter->symbol,
 353                                        &parameter->scope);
 354                 }
 355         }
 356         if (type->variadic) {
 357                 if (first) {
 358                         first = false;
 359                 } else {
 360                         fputs(", ", out);
 361                 }
 362                 fputs("...", out);
 363         }
 364         if (first && !type->unspecified_parameters) {
 365                 fputs("void", out);
 366         }
 367         fputc(')', out);
 368
 369         /* don't emit braces if we're the toplevel type... */
 370         if (!top)
 371                 fputc(')', out);
 372 }
 373
 374 /**
 375  * Prints the prefix part of a pointer type.
 376  *
 377  * @param type   The pointer type.
 378  */
 379 static void print_pointer_type_pre(const pointer_type_t *type)
 380 {
 381         intern_print_type_pre(type->points_to, false);
 382         fputs("*", out);
 383         print_type_qualifiers(type->base.qualifiers);
 384         if (type->base.qualifiers != 0)
 385                 fputc(' ', out);
 386 }
 387
 388 /**
 389  * Prints the postfix part of a pointer type.
 390  *
 391  * @param type   The pointer type.
 392  */
 393 static void print_pointer_type_post(const pointer_type_t *type)
 394 {
 395         intern_print_type_post(type->points_to, false);
 396 }
 397
 398 /**
 399  * Prints the prefix part of an array type.
 400  *
 401  * @param type   The array type.
 402  */
 403 static void print_array_type_pre(const array_type_t *type)
 404 {
 405         intern_print_type_pre(type->element_type, false);
 406 }
 407
 408 /**
 409  * Prints the postfix part of an array type.
 410  *
 411  * @param type   The array type.
 412  */
 413 static void print_array_type_post(const array_type_t *type)
 414 {
 415         fputc('[', out);
 416         if (type->is_static) {
 417                 fputs("static ", out);
 418         }
 419         print_type_qualifiers(type->base.qualifiers);
 420         if (type->base.qualifiers != 0)
 421                 fputc(' ', out);
 422         if (type->size_expression != NULL
 423                         && (print_implicit_array_size || !type->has_implicit_size)) {
 424                 print_expression(type->size_expression);
 425         }
 426         fputc(']', out);
 427         intern_print_type_post(type->element_type, false);
 428 }
 429
 430 /**
 431  * Prints the postfix part of a bitfield type.
 432  *
 433  * @param type   The array type.
 434  */
 435 static void print_bitfield_type_post(const bitfield_type_t *type)
 436 {
 437         fputs(" : ", out);
 438         print_expression(type->size);
 439         intern_print_type_post(type->base_type, false);
 440 }
 441
 442 /**
 443  * Prints an enum definition.
 444  *
 445  * @param declaration  The enum's type declaration.
 446  */
 447 void print_enum_definition(const declaration_t *declaration)
 448 {
 449         fputs("{\n", out);
 450
 451         change_indent(1);
 452
 453         declaration_t *entry = declaration->next;
 454         for( ; entry != NULL && entry->storage_class == STORAGE_CLASS_ENUM_ENTRY;
 455                entry = entry->next) {
 456
 457                 print_indent();
 458                 fprintf(out, "%s", entry->symbol->string);
 459                 if (entry->init.initializer != NULL) {
 460                         fprintf(out, " = ");
 461
 462                         /* skip the implicit cast */
 463                         expression_t *expression = entry->init.enum_value;
 464                         if (expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
 465                                 expression = expression->unary.value;
 466                         }
 467                         print_expression(expression);
 468                 }
 469                 fprintf(out, ",\n");
 470         }
 471
 472         change_indent(-1);
 473         print_indent();
 474         fputs("}", out);
 475 }
 476
 477 /**
 478  * Prints an enum type.
 479  *
 480  * @param type  The enum type.
 481  */
 482 static void print_type_enum(const enum_type_t *type)
 483 {
 484         int empty = type->base.qualifiers == 0;
 485         print_type_qualifiers(type->base.qualifiers);
 486         fputs(" enum " + empty, out);
 487
 488         declaration_t *declaration = type->declaration;
 489         symbol_t      *symbol      = declaration->symbol;
 490         if (symbol != NULL) {
 491                 fputs(symbol->string, out);
 492         } else {
 493                 print_enum_definition(declaration);
 494         }
 495 }
 496
 497 /**
 498  * Print the compound part of a compound type.
 499  *
 500  * @param declaration  The declaration of the compound type.
 501  */
 502 void print_compound_definition(const declaration_t *declaration)
 503 {
 504         fputs("{\n", out);
 505         change_indent(1);
 506
 507         declaration_t *iter = declaration->scope.declarations;
 508         for( ; iter != NULL; iter = iter->next) {
 509                 print_indent();
 510                 print_declaration(iter);
 511                 fputc('\n', out);
 512         }
 513
 514         change_indent(-1);
 515         print_indent();
 516         fputs("}", out);
 517 }
 518
 519 /**
 520  * Prints a compound type.
 521  *
 522  * @param type  The compound type.
 523  */
 524 static void print_compound_type(const compound_type_t *type)
 525 {
 526         int empty = type->base.qualifiers == 0;
 527         print_type_qualifiers(type->base.qualifiers);
 528
 529         if (type->base.kind == TYPE_COMPOUND_STRUCT) {
 530                 fputs(" struct " + empty, out);
 531         } else {
 532                 assert(type->base.kind == TYPE_COMPOUND_UNION);
 533                 fputs(" union " + empty, out);
 534         }
 535
 536         declaration_t *declaration = type->declaration;
 537         symbol_t      *symbol      = declaration->symbol;
 538         if (symbol != NULL) {
 539                 fputs(symbol->string, out);
 540         } else {
 541                 print_compound_definition(declaration);
 542         }
 543 }
 544
 545 /**
 546  * Prints the prefix part of a typedef type.
 547  *
 548  * @param type   The typedef type.
 549  */
 550 static void print_typedef_type_pre(const typedef_type_t *const type)
 551 {
 552         print_type_qualifiers(type->base.qualifiers);
 553         if (type->base.qualifiers != 0)
 554                 fputc(' ', out);
 555         fputs(type->declaration->symbol->string, out);
 556 }
 557
 558 /**
 559  * Prints the prefix part of a typeof type.
 560  *
 561  * @param type   The typeof type.
 562  */
 563 static void print_typeof_type_pre(const typeof_type_t *const type)
 564 {
 565         fputs("typeof(", out);
 566         if (type->expression != NULL) {
 567                 assert(type->typeof_type == NULL);
 568                 print_expression(type->expression);
 569         } else {
 570                 print_type(type->typeof_type);
 571         }
 572         fputc(')', out);
 573 }
 574
 575 /**
 576  * Prints the prefix part of a type.
 577  *
 578  * @param type   The type.
 579  * @param top    true if we print the toplevel type, false else.
 580  */
 581 static void intern_print_type_pre(const type_t *const type, const bool top)
 582 {
 583         switch(type->kind) {
 584         case TYPE_ERROR:
 585                 fputs("<error>", out);
 586                 return;
 587         case TYPE_INVALID:
 588                 fputs("<invalid>", out);
 589                 return;
 590         case TYPE_ENUM:
 591                 print_type_enum(&type->enumt);
 592                 return;
 593         case TYPE_ATOMIC:
 594                 print_atomic_type(&type->atomic);
 595                 return;
 596         case TYPE_COMPLEX:
 597                 print_complex_type(&type->complex);
 598                 return;
 599         case TYPE_IMAGINARY:
 600                 print_imaginary_type(&type->imaginary);
 601                 return;
 602         case TYPE_COMPOUND_STRUCT:
 603         case TYPE_COMPOUND_UNION:
 604                 print_compound_type(&type->compound);
 605                 return;
 606         case TYPE_BUILTIN:
 607                 fputs(type->builtin.symbol->string, out);
 608                 return;
 609         case TYPE_FUNCTION:
 610                 print_function_type_pre(&type->function, top);
 611                 return;
 612         case TYPE_POINTER:
 613                 print_pointer_type_pre(&type->pointer);
 614                 return;
 615         case TYPE_BITFIELD:
 616                 intern_print_type_pre(type->bitfield.base_type, top);
 617                 return;
 618         case TYPE_ARRAY:
 619                 print_array_type_pre(&type->array);
 620                 return;
 621         case TYPE_TYPEDEF:
 622                 print_typedef_type_pre(&type->typedeft);
 623                 return;
 624         case TYPE_TYPEOF:
 625                 print_typeof_type_pre(&type->typeoft);
 626                 return;
 627         }
 628         fputs("unknown", out);
 629 }
 630
 631 /**
 632  * Prints the postfix part of a type.
 633  *
 634  * @param type   The type.
 635  * @param top    true if we print the toplevel type, false else.
 636  */
 637 static void intern_print_type_post(const type_t *const type, const bool top)
 638 {
 639         switch(type->kind) {
 640         case TYPE_FUNCTION:
 641                 print_function_type_post(&type->function, NULL, top);
 642                 return;
 643         case TYPE_POINTER:
 644                 print_pointer_type_post(&type->pointer);
 645                 return;
 646         case TYPE_ARRAY:
 647                 print_array_type_post(&type->array);
 648                 return;
 649         case TYPE_BITFIELD:
 650                 print_bitfield_type_post(&type->bitfield);
 651                 return;
 652         case TYPE_ERROR:
 653         case TYPE_INVALID:
 654         case TYPE_ATOMIC:
 655         case TYPE_COMPLEX:
 656         case TYPE_IMAGINARY:
 657         case TYPE_ENUM:
 658         case TYPE_COMPOUND_STRUCT:
 659         case TYPE_COMPOUND_UNION:
 660         case TYPE_BUILTIN:
 661         case TYPE_TYPEOF:
 662         case TYPE_TYPEDEF:
 663                 break;
 664         }
 665 }
 666
 667 /**
 668  * Prints a type.
 669  *
 670  * @param type   The type.
 671  */
 672 void print_type(const type_t *const type)
 673 {
 674         print_type_ext(type, NULL, NULL);
 675 }
 676
 677 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 678                     const scope_t *scope)
 679 {
 680         if (type == NULL) {
 681                 fputs("nil type", out);
 682                 return;
 683         }
 684
 685         intern_print_type_pre(type, true);
 686         if (symbol != NULL) {
 687                 fputc(' ', out);
 688                 fputs(symbol->string, out);
 689         }
 690         if (type->kind == TYPE_FUNCTION) {
 691                 print_function_type_post(&type->function, scope, true);
 692         } else {
 693                 intern_print_type_post(type, true);
 694         }
 695 }
 696
 697 /**
 698  * Return the size of a type AST node.
 699  *
 700  * @param type  The type.
 701  */
 702 static size_t get_type_size(const type_t *type)
 703 {
 704         switch(type->kind) {
 705         case TYPE_ATOMIC:          return sizeof(atomic_type_t);
 706         case TYPE_COMPLEX:         return sizeof(complex_type_t);
 707         case TYPE_IMAGINARY:       return sizeof(imaginary_type_t);
 708         case TYPE_COMPOUND_STRUCT:
 709         case TYPE_COMPOUND_UNION:  return sizeof(compound_type_t);
 710         case TYPE_ENUM:            return sizeof(enum_type_t);
 711         case TYPE_FUNCTION:        return sizeof(function_type_t);
 712         case TYPE_POINTER:         return sizeof(pointer_type_t);
 713         case TYPE_ARRAY:           return sizeof(array_type_t);
 714         case TYPE_BUILTIN:         return sizeof(builtin_type_t);
 715         case TYPE_TYPEDEF:         return sizeof(typedef_type_t);
 716         case TYPE_TYPEOF:          return sizeof(typeof_type_t);
 717         case TYPE_BITFIELD:        return sizeof(bitfield_type_t);
 718         case TYPE_ERROR:           panic("error type found");
 719         case TYPE_INVALID:         panic("invalid type found");
 720         }
 721         panic("unknown type found");
 722 }
 723
 724 /**
 725  * Duplicates a type.
 726  *
 727  * @param type  The type to copy.
 728  * @return A copy of the type.
 729  *
 730  * @note This does not produce a deep copy!
 731  */
 732 type_t *duplicate_type(const type_t *type)
 733 {
 734         size_t size = get_type_size(type);
 735
 736         type_t *copy = obstack_alloc(type_obst, size);
 737         memcpy(copy, type, size);
 738
 739         return copy;
 740 }
 741
 742 /**
 743  * Returns the unqualified type of a given type.
 744  *
 745  * @param type  The type.
 746  * @returns The unqualified type.
 747  */
 748 type_t *get_unqualified_type(type_t *type)
 749 {
 750         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 751                 return type;
 752
 753         type_t *unqualified_type          = duplicate_type(type);
 754         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 755
 756         type_t *result = typehash_insert(unqualified_type);
 757         if (result != unqualified_type) {
 758                 obstack_free(type_obst, unqualified_type);
 759         }
 760
 761         return result;
 762 }
 763
 764 /**
 765  * Check if a type is valid.
 766  *
 767  * @param type  The type to check.
 768  * @return true if type represents a valid type.
 769  */
 770 bool type_valid(const type_t *type)
 771 {
 772         return type->kind != TYPE_INVALID;
 773 }
 774
 775 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 776                                   atomic_type_flag_t flag)
 777 {
 778         assert(kind <= ATOMIC_TYPE_LAST);
 779         return (atomic_type_properties[kind].flags & flag) != 0;
 780 }
 781
 782 /**
 783  * Returns true if the given type is an integer type.
 784  *
 785  * @param type  The type to check.
 786  * @return True if type is an integer type.
 787  */
 788 bool is_type_integer(const type_t *type)
 789 {
 790         assert(!is_typeref(type));
 791
 792         if (type->kind == TYPE_ENUM)
 793                 return true;
 794         if (type->kind == TYPE_BITFIELD)
 795                 return true;
 796
 797         if (type->kind != TYPE_ATOMIC)
 798                 return false;
 799
 800         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 801 }
 802
 803 /**
 804  * Returns true if the given type is an enum type.
 805  *
 806  * @param type  The type to check.
 807  * @return True if type is an enum type.
 808  */
 809 bool is_type_enum(const type_t *type)
 810 {
 811         assert(!is_typeref(type));
 812         return type->kind == TYPE_ENUM;
 813 }
 814
 815 /**
 816  * Returns true if the given type is an floating point type.
 817  *
 818  * @param type  The type to check.
 819  * @return True if type is a floating point type.
 820  */
 821 bool is_type_float(const type_t *type)
 822 {
 823         assert(!is_typeref(type));
 824
 825         if (type->kind != TYPE_ATOMIC)
 826                 return false;
 827
 828         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 829 }
 830
 831 /**
 832  * Returns true if the given type is a signed type.
 833  *
 834  * @param type  The type to check.
 835  * @return True if type is a signed type.
 836  */
 837 bool is_type_signed(const type_t *type)
 838 {
 839         assert(!is_typeref(type));
 840
 841         /* enum types are int for now */
 842         if (type->kind == TYPE_ENUM)
 843                 return true;
 844         if (type->kind == TYPE_BITFIELD)
 845                 return is_type_signed(type->bitfield.base_type);
 846
 847         if (type->kind != TYPE_ATOMIC)
 848                 return false;
 849
 850         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 851 }
 852
 853 /**
 854  * Returns true if the given type represents an arithmetic type.
 855  *
 856  * @param type  The type to check.
 857  * @return True if type represents an arithmetic type.
 858  */
 859 bool is_type_arithmetic(const type_t *type)
 860 {
 861         assert(!is_typeref(type));
 862
 863         switch(type->kind) {
 864         case TYPE_BITFIELD:
 865         case TYPE_ENUM:
 866                 return true;
 867         case TYPE_ATOMIC:
 868                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 869         case TYPE_COMPLEX:
 870                 return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 871         case TYPE_IMAGINARY:
 872                 return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 873         default:
 874                 return false;
 875         }
 876 }
 877
 878 /**
 879  * Returns true if the given type is an integer or float type.
 880  *
 881  * @param type  The type to check.
 882  * @return True if type is an integer or float type.
 883  */
 884 bool is_type_real(const type_t *type)
 885 {
 886         /* 6.2.5.17 */
 887         return is_type_integer(type)
 888                 || (type->kind == TYPE_ATOMIC && is_type_float(type));
 889 }
 890
 891 /**
 892  * Returns true if the given type represents a scalar type.
 893  *
 894  * @param type  The type to check.
 895  * @return True if type represents a scalar type.
 896  */
 897 bool is_type_scalar(const type_t *type)
 898 {
 899         assert(!is_typeref(type));
 900
 901         switch (type->kind) {
 902                 case TYPE_POINTER: return true;
 903                 case TYPE_BUILTIN: return is_type_scalar(type->builtin.real_type);
 904                 default:           break;
 905         }
 906
 907         return is_type_arithmetic(type);
 908 }
 909
 910 /**
 911  * Check if a given type is incomplete.
 912  *
 913  * @param type  The type to check.
 914  * @return True if the given type is incomplete (ie. just forward).
 915  */
 916 bool is_type_incomplete(const type_t *type)
 917 {
 918         assert(!is_typeref(type));
 919
 920         switch(type->kind) {
 921         case TYPE_COMPOUND_STRUCT:
 922         case TYPE_COMPOUND_UNION: {
 923                 const compound_type_t *compound_type = &type->compound;
 924                 declaration_t         *declaration   = compound_type->declaration;
 925                 return !declaration->init.complete;
 926         }
 927         case TYPE_ENUM: {
 928                 const enum_type_t *enum_type   = &type->enumt;
 929                 declaration_t     *declaration = enum_type->declaration;
 930                 return !declaration->init.complete;
 931         }
 932
 933         case TYPE_ARRAY:
 934                 return type->array.size_expression == NULL
 935                         && !type->array.size_constant;
 936
 937         case TYPE_ATOMIC:
 938                 return type->atomic.akind == ATOMIC_TYPE_VOID;
 939
 940         case TYPE_COMPLEX:
 941                 return type->complex.akind == ATOMIC_TYPE_VOID;
 942
 943         case TYPE_IMAGINARY:
 944                 return type->imaginary.akind == ATOMIC_TYPE_VOID;
 945
 946         case TYPE_BITFIELD:
 947         case TYPE_FUNCTION:
 948         case TYPE_POINTER:
 949         case TYPE_BUILTIN:
 950         case TYPE_ERROR:
 951                 return false;
 952
 953         case TYPE_TYPEDEF:
 954         case TYPE_TYPEOF:
 955                 panic("is_type_incomplete called without typerefs skipped");
 956         case TYPE_INVALID:
 957                 break;
 958         }
 959
 960         panic("invalid type found");
 961 }
 962
 963 bool is_type_object(const type_t *type)
 964 {
 965         return !is_type_function(type) && !is_type_incomplete(type);
 966 }
 967
 968 /**
 969  * Check if two function types are compatible.
 970  */
 971 static bool function_types_compatible(const function_type_t *func1,
 972                                       const function_type_t *func2)
 973 {
 974         const type_t* const ret1 = skip_typeref(func1->return_type);
 975         const type_t* const ret2 = skip_typeref(func2->return_type);
 976         if (!types_compatible(ret1, ret2))
 977                 return false;
 978
 979         /* can parameters be compared? */
 980         if (func1->unspecified_parameters || func2->unspecified_parameters)
 981                 return true;
 982
 983         if (func1->variadic != func2->variadic)
 984                 return false;
 985
 986         if (func1->calling_convention != func2->calling_convention)
 987                 return false;
 988
 989         /* TODO: handling of unspecified parameters not correct yet */
 990
 991         /* all argument types must be compatible */
 992         function_parameter_t *parameter1 = func1->parameters;
 993         function_parameter_t *parameter2 = func2->parameters;
 994         for ( ; parameter1 != NULL && parameter2 != NULL;
 995                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
 996                 type_t *parameter1_type = skip_typeref(parameter1->type);
 997                 type_t *parameter2_type = skip_typeref(parameter2->type);
 998
 999                 parameter1_type = get_unqualified_type(parameter1_type);
1000                 parameter2_type = get_unqualified_type(parameter2_type);
1001
1002                 if (!types_compatible(parameter1_type, parameter2_type))
1003                         return false;
1004         }
1005         /* same number of arguments? */
1006         if (parameter1 != NULL || parameter2 != NULL)
1007                 return false;
1008
1009         return true;
1010 }
1011
1012 /**
1013  * Check if two array types are compatible.
1014  */
1015 static bool array_types_compatible(const array_type_t *array1,
1016                                    const array_type_t *array2)
1017 {
1018         type_t *element_type1 = skip_typeref(array1->element_type);
1019         type_t *element_type2 = skip_typeref(array2->element_type);
1020         if (!types_compatible(element_type1, element_type2))
1021                 return false;
1022
1023         if (!array1->size_constant || !array2->size_constant)
1024                 return true;
1025
1026         return array1->size == array2->size;
1027 }
1028
1029 /**
1030  * Check if two types are compatible.
1031  */
1032 bool types_compatible(const type_t *type1, const type_t *type2)
1033 {
1034         assert(!is_typeref(type1));
1035         assert(!is_typeref(type2));
1036
1037         /* shortcut: the same type is always compatible */
1038         if (type1 == type2)
1039                 return true;
1040
1041         if (type1->base.qualifiers != type2->base.qualifiers)
1042                 return false;
1043         if (type1->kind != type2->kind)
1044                 return false;
1045
1046         switch(type1->kind) {
1047         case TYPE_FUNCTION:
1048                 return function_types_compatible(&type1->function, &type2->function);
1049         case TYPE_ATOMIC:
1050                 return type1->atomic.akind == type2->atomic.akind;
1051         case TYPE_COMPLEX:
1052                 return type1->complex.akind == type2->complex.akind;
1053         case TYPE_IMAGINARY:
1054                 return type1->imaginary.akind == type2->imaginary.akind;
1055         case TYPE_ARRAY:
1056                 return array_types_compatible(&type1->array, &type2->array);
1057
1058         case TYPE_POINTER: {
1059                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
1060                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
1061                 return types_compatible(to1, to2);
1062         }
1063
1064         case TYPE_COMPOUND_STRUCT:
1065         case TYPE_COMPOUND_UNION:
1066         case TYPE_ENUM:
1067         case TYPE_BUILTIN:
1068                 /* TODO: not implemented */
1069                 break;
1070
1071         case TYPE_BITFIELD:
1072                 /* not sure if this makes sense or is even needed, implement it if you
1073                  * really need it! */
1074                 panic("type compatibility check for bitfield type");
1075
1076         case TYPE_ERROR:
1077                 /* Hmm, the error type should be compatible to all other types */
1078                 return true;
1079         case TYPE_INVALID:
1080                 panic("invalid type found in compatible types");
1081         case TYPE_TYPEDEF:
1082         case TYPE_TYPEOF:
1083                 panic("typerefs not skipped in compatible types?!?");
1084         }
1085
1086         /* TODO: incomplete */
1087         return false;
1088 }
1089
1090 /**
1091  * Skip all typerefs and return the underlying type.
1092  */
1093 type_t *skip_typeref(type_t *type)
1094 {
1095         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1096         type_modifiers_t  modifiers  = TYPE_MODIFIER_NONE;
1097
1098         while(true) {
1099                 switch(type->kind) {
1100                 case TYPE_ERROR:
1101                         return type;
1102                 case TYPE_TYPEDEF: {
1103                         qualifiers |= type->base.qualifiers;
1104                         modifiers  |= type->base.modifiers;
1105                         const typedef_type_t *typedef_type = &type->typedeft;
1106                         if (typedef_type->resolved_type != NULL) {
1107                                 type = typedef_type->resolved_type;
1108                                 break;
1109                         }
1110                         type = typedef_type->declaration->type;
1111                         continue;
1112                 }
1113                 case TYPE_TYPEOF: {
1114                         const typeof_type_t *typeof_type = &type->typeoft;
1115                         if (typeof_type->typeof_type != NULL) {
1116                                 type = typeof_type->typeof_type;
1117                         } else {
1118                                 type = typeof_type->expression->base.type;
1119                         }
1120                         continue;
1121                 }
1122                 default:
1123                         break;
1124                 }
1125                 break;
1126         }
1127
1128         if (qualifiers != TYPE_QUALIFIER_NONE || modifiers != TYPE_MODIFIER_NONE) {
1129                 type_t *const copy = duplicate_type(type);
1130
1131                 /* for const with typedefed array type the element type has to be
1132                  * adjusted */
1133                 if (is_type_array(copy)) {
1134                         type_t *element_type           = copy->array.element_type;
1135                         element_type                   = duplicate_type(element_type);
1136                         element_type->base.qualifiers |= qualifiers;
1137                         element_type->base.modifiers  |= modifiers;
1138                         copy->array.element_type       = element_type;
1139                 } else {
1140                         copy->base.qualifiers |= qualifiers;
1141                         copy->base.modifiers  |= modifiers;
1142                 }
1143
1144                 type = typehash_insert(copy);
1145                 if (type != copy) {
1146                         obstack_free(type_obst, copy);
1147                 }
1148         }
1149
1150         return type;
1151 }
1152
1153 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1154 {
1155         assert(kind <= ATOMIC_TYPE_LAST);
1156         return atomic_type_properties[kind].size;
1157 }
1158
1159 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1160 {
1161         assert(kind <= ATOMIC_TYPE_LAST);
1162         return atomic_type_properties[kind].alignment;
1163 }
1164
1165 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1166 {
1167         assert(kind <= ATOMIC_TYPE_LAST);
1168         return atomic_type_properties[kind].flags;
1169 }
1170
1171 atomic_type_kind_t get_intptr_kind(void)
1172 {
1173         if (machine_size <= 32)
1174                 return ATOMIC_TYPE_INT;
1175         else if (machine_size <= 64)
1176                 return ATOMIC_TYPE_LONG;
1177         else
1178                 return ATOMIC_TYPE_LONGLONG;
1179 }
1180
1181 atomic_type_kind_t get_uintptr_kind(void)
1182 {
1183         if (machine_size <= 32)
1184                 return ATOMIC_TYPE_UINT;
1185         else if (machine_size <= 64)
1186                 return ATOMIC_TYPE_ULONG;
1187         else
1188                 return ATOMIC_TYPE_ULONGLONG;
1189 }
1190
1191 /**
1192  * Find the atomic type kind representing a given size (signed).
1193  */
1194 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size) {
1195         static atomic_type_kind_t kinds[32];
1196
1197         assert(size < 32);
1198         atomic_type_kind_t kind = kinds[size];
1199         if (kind == ATOMIC_TYPE_INVALID) {
1200                 static const atomic_type_kind_t possible_kinds[] = {
1201                         ATOMIC_TYPE_SCHAR,
1202                         ATOMIC_TYPE_SHORT,
1203                         ATOMIC_TYPE_INT,
1204                         ATOMIC_TYPE_LONG,
1205                         ATOMIC_TYPE_LONGLONG
1206                 };
1207                 for(unsigned i = 0; i < sizeof(possible_kinds)/sizeof(possible_kinds[0]); ++i) {
1208                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1209                                 kind = possible_kinds[i];
1210                                 break;
1211                         }
1212                 }
1213                 kinds[size] = kind;
1214         }
1215         return kind;
1216 }
1217
1218 /**
1219  * Find the atomic type kind representing a given size (signed).
1220  */
1221 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size) {
1222         static atomic_type_kind_t kinds[32];
1223
1224         assert(size < 32);
1225         atomic_type_kind_t kind = kinds[size];
1226         if (kind == ATOMIC_TYPE_INVALID) {
1227                 static const atomic_type_kind_t possible_kinds[] = {
1228                         ATOMIC_TYPE_UCHAR,
1229                         ATOMIC_TYPE_USHORT,
1230                         ATOMIC_TYPE_UINT,
1231                         ATOMIC_TYPE_ULONG,
1232                         ATOMIC_TYPE_ULONGLONG
1233                 };
1234                 for(unsigned i = 0; i < sizeof(possible_kinds)/sizeof(possible_kinds[0]); ++i) {
1235                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1236                                 kind = possible_kinds[i];
1237                                 break;
1238                         }
1239                 }
1240                 kinds[size] = kind;
1241         }
1242         return kind;
1243 }
1244
1245 /**
1246  * Hash the given type and return the "singleton" version
1247  * of it.
1248  */
1249 static type_t *identify_new_type(type_t *type)
1250 {
1251         type_t *result = typehash_insert(type);
1252         if (result != type) {
1253                 obstack_free(type_obst, type);
1254         }
1255         return result;
1256 }
1257
1258 /**
1259  * Creates a new atomic type.
1260  *
1261  * @param akind       The kind of the atomic type.
1262  * @param qualifiers  Type qualifiers for the new type.
1263  */
1264 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1265 {
1266         type_t *type = obstack_alloc(type_obst, sizeof(atomic_type_t));
1267         memset(type, 0, sizeof(atomic_type_t));
1268
1269         type->kind            = TYPE_ATOMIC;
1270         type->base.qualifiers = qualifiers;
1271         type->base.alignment  = get_atomic_type_alignment(akind);
1272         type->atomic.akind    = akind;
1273
1274         return identify_new_type(type);
1275 }
1276
1277 /**
1278  * Creates a new complex type.
1279  *
1280  * @param akind       The kind of the atomic type.
1281  * @param qualifiers  Type qualifiers for the new type.
1282  */
1283 type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1284 {
1285         type_t *type = obstack_alloc(type_obst, sizeof(complex_type_t));
1286         memset(type, 0, sizeof(complex_type_t));
1287
1288         type->kind            = TYPE_COMPLEX;
1289         type->base.qualifiers = qualifiers;
1290         type->base.alignment  = get_atomic_type_alignment(akind);
1291         type->complex.akind   = akind;
1292
1293         return identify_new_type(type);
1294 }
1295
1296 /**
1297  * Creates a new imaginary type.
1298  *
1299  * @param akind       The kind of the atomic type.
1300  * @param qualifiers  Type qualifiers for the new type.
1301  */
1302 type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1303 {
1304         type_t *type = obstack_alloc(type_obst, sizeof(imaginary_type_t));
1305         memset(type, 0, sizeof(imaginary_type_t));
1306
1307         type->kind            = TYPE_IMAGINARY;
1308         type->base.qualifiers = qualifiers;
1309         type->base.alignment  = get_atomic_type_alignment(akind);
1310         type->imaginary.akind = akind;
1311
1312         return identify_new_type(type);
1313 }
1314
1315 /**
1316  * Creates a new pointer type.
1317  *
1318  * @param points_to   The points-to type for the new type.
1319  * @param qualifiers  Type qualifiers for the new type.
1320  */
1321 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1322 {
1323         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1324         memset(type, 0, sizeof(pointer_type_t));
1325
1326         type->kind              = TYPE_POINTER;
1327         type->base.qualifiers   = qualifiers;
1328         type->base.alignment    = 0;
1329         type->pointer.points_to = points_to;
1330
1331         return identify_new_type(type);
1332 }
1333
1334 type_t *make_array_type(type_t *element_type, size_t size,
1335                         type_qualifiers_t qualifiers)
1336 {
1337         type_t *type = obstack_alloc(type_obst, sizeof(array_type_t));
1338         memset(type, 0, sizeof(array_type_t));
1339
1340         type->kind                = TYPE_ARRAY;
1341         type->base.qualifiers     = qualifiers;
1342         type->base.alignment      = 0;
1343         type->array.element_type  = element_type;
1344         type->array.size          = size;
1345         type->array.size_constant = true;
1346
1347         return identify_new_type(type);
1348 }
1349
1350 /**
1351  * Debug helper. Prints the given type to stdout.
1352  */
1353 static __attribute__((unused))
1354 void dbg_type(const type_t *type)
1355 {
1356         FILE *old_out = out;
1357         out = stderr;
1358         print_type(type);
1359         puts("\n");
1360         fflush(stderr);
1361         out = old_out;
1362 }