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 "entity_t.h"
  27 #include "symbol_t.h"
  28 #include "type_hash.h"
  29 #include "adt/error.h"
  30 #include "adt/util.h"
  31 #include "lang_features.h"
  32
  33 static struct obstack   _type_obst;
  34 static FILE            *out;
  35 struct obstack         *type_obst                 = &_type_obst;
  36 static int              type_visited              = 0;
  37 static bool             print_implicit_array_size = false;
  38
  39 static void intern_print_type_pre(const type_t *type, bool top);
  40 static void intern_print_type_post(const type_t *type, bool top);
  41
  42 typedef struct atomic_type_properties_t atomic_type_properties_t;
  43 struct atomic_type_properties_t {
  44         unsigned   size;              /**< type size in bytes */
  45         unsigned   alignment;         /**< type alignment in bytes */
  46         unsigned   flags;             /**< type flags from atomic_type_flag_t */
  47 };
  48
  49 static atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
  50         //ATOMIC_TYPE_INVALID = 0,
  51         [ATOMIC_TYPE_VOID] = {
  52                 .size       = 0,
  53                 .alignment  = 0,
  54                 .flags      = ATOMIC_TYPE_FLAG_NONE
  55         },
  56         [ATOMIC_TYPE_WCHAR_T] = {
  57                 .size       = (unsigned)-1,
  58                 .alignment  = (unsigned)-1,
  59                 /* signed flag will be set when known */
  60                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  61         },
  62         [ATOMIC_TYPE_CHAR] = {
  63                 .size       = 1,
  64                 .alignment  = 1,
  65                 /* signed flag will be set when known */
  66                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  67         },
  68         [ATOMIC_TYPE_SCHAR] = {
  69                 .size       = 1,
  70                 .alignment  = 1,
  71                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  72                               | ATOMIC_TYPE_FLAG_SIGNED,
  73         },
  74         [ATOMIC_TYPE_UCHAR] = {
  75                 .size       = 1,
  76                 .alignment  = 1,
  77                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  78         },
  79         [ATOMIC_TYPE_SHORT] = {
  80                 .size       = 2,
  81                 .alignment  = 2,
  82                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  83                               | ATOMIC_TYPE_FLAG_SIGNED
  84         },
  85         [ATOMIC_TYPE_USHORT] = {
  86                 .size       = 2,
  87                 .alignment  = 2,
  88                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  89         },
  90         [ATOMIC_TYPE_INT] = {
  91                 .size       = (unsigned) -1,
  92                 .alignment  = (unsigned) -1,
  93                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  94                               | ATOMIC_TYPE_FLAG_SIGNED,
  95         },
  96         [ATOMIC_TYPE_UINT] = {
  97                 .size       = (unsigned) -1,
  98                 .alignment  = (unsigned) -1,
  99                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 100         },
 101         [ATOMIC_TYPE_LONG] = {
 102                 .size       = (unsigned) -1,
 103                 .alignment  = (unsigned) -1,
 104                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 105                               | ATOMIC_TYPE_FLAG_SIGNED,
 106         },
 107         [ATOMIC_TYPE_ULONG] = {
 108                 .size       = (unsigned) -1,
 109                 .alignment  = (unsigned) -1,
 110                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 111         },
 112         [ATOMIC_TYPE_LONGLONG] = {
 113                 .size       = (unsigned) -1,
 114                 .alignment  = (unsigned) -1,
 115                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 116                               | ATOMIC_TYPE_FLAG_SIGNED,
 117         },
 118         [ATOMIC_TYPE_ULONGLONG] = {
 119                 .size       = (unsigned) -1,
 120                 .alignment  = (unsigned) -1,
 121                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 122         },
 123         [ATOMIC_TYPE_BOOL] = {
 124                 .size       = (unsigned) -1,
 125                 .alignment  = (unsigned) -1,
 126                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 127         },
 128         [ATOMIC_TYPE_FLOAT] = {
 129                 .size       = 4,
 130                 .alignment  = (unsigned) -1,
 131                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 132                               | ATOMIC_TYPE_FLAG_SIGNED,
 133         },
 134         [ATOMIC_TYPE_DOUBLE] = {
 135                 .size       = 8,
 136                 .alignment  = (unsigned) -1,
 137                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 138                               | ATOMIC_TYPE_FLAG_SIGNED,
 139         },
 140         [ATOMIC_TYPE_LONG_DOUBLE] = {
 141                 .size       = 12,
 142                 .alignment  = (unsigned) -1,
 143                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 144                               | ATOMIC_TYPE_FLAG_SIGNED,
 145         },
 146         /* complex and imaginary types are set in init_types */
 147 };
 148
 149 void init_types(void)
 150 {
 151         obstack_init(type_obst);
 152
 153         atomic_type_properties_t *props = atomic_type_properties;
 154
 155         if (char_is_signed) {
 156                 props[ATOMIC_TYPE_CHAR].flags |= ATOMIC_TYPE_FLAG_SIGNED;
 157         }
 158
 159         unsigned int_size   = machine_size < 32 ? 2 : 4;
 160         unsigned long_size  = machine_size < 64 ? 4 : 8;
 161         unsigned llong_size = machine_size < 32 ? 4 : 8;
 162
 163         props[ATOMIC_TYPE_INT].size            = int_size;
 164         props[ATOMIC_TYPE_INT].alignment       = int_size;
 165         props[ATOMIC_TYPE_UINT].size           = int_size;
 166         props[ATOMIC_TYPE_UINT].alignment      = int_size;
 167         props[ATOMIC_TYPE_LONG].size           = long_size;
 168         props[ATOMIC_TYPE_LONG].alignment      = long_size;
 169         props[ATOMIC_TYPE_ULONG].size          = long_size;
 170         props[ATOMIC_TYPE_ULONG].alignment     = long_size;
 171         props[ATOMIC_TYPE_LONGLONG].size       = llong_size;
 172         props[ATOMIC_TYPE_LONGLONG].alignment  = llong_size;
 173         props[ATOMIC_TYPE_ULONGLONG].size      = llong_size;
 174         props[ATOMIC_TYPE_ULONGLONG].alignment = llong_size;
 175
 176         /* TODO: backend specific, need a way to query the backend for this.
 177          * The following are good settings for x86 */
 178         props[ATOMIC_TYPE_FLOAT].alignment       = 4;
 179         props[ATOMIC_TYPE_DOUBLE].alignment      = 4;
 180         props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 4;
 181         props[ATOMIC_TYPE_LONGLONG].alignment    = 4;
 182         props[ATOMIC_TYPE_ULONGLONG].alignment   = 4;
 183
 184         /* TODO: make this configurable for platforms which do not use byte sized
 185          * bools. */
 186         props[ATOMIC_TYPE_BOOL] = props[ATOMIC_TYPE_UCHAR];
 187
 188         props[ATOMIC_TYPE_WCHAR_T] = props[wchar_atomic_kind];
 189 }
 190
 191 void exit_types(void)
 192 {
 193         obstack_free(type_obst, NULL);
 194 }
 195
 196 void type_set_output(FILE *stream)
 197 {
 198         out = stream;
 199 }
 200
 201 void inc_type_visited(void)
 202 {
 203         type_visited++;
 204 }
 205
 206 void print_type_qualifiers(type_qualifiers_t qualifiers)
 207 {
 208         int first = 1;
 209         if (qualifiers & TYPE_QUALIFIER_CONST) {
 210                 fputs(" const" + first,    out);
 211                 first = 0;
 212         }
 213         if (qualifiers & TYPE_QUALIFIER_VOLATILE) {
 214                 fputs(" volatile" + first, out);
 215                 first = 0;
 216         }
 217         if (qualifiers & TYPE_QUALIFIER_RESTRICT) {
 218                 fputs(" restrict" + first, out);
 219                 first = 0;
 220         }
 221 }
 222
 223 const char *get_atomic_kind_name(atomic_type_kind_t kind)
 224 {
 225         switch(kind) {
 226         case ATOMIC_TYPE_INVALID: break;
 227         case ATOMIC_TYPE_VOID:        return "void";
 228         case ATOMIC_TYPE_WCHAR_T:     return "wchar_t";
 229         case ATOMIC_TYPE_BOOL:        return c_mode & _CXX ? "bool" : "_Bool";
 230         case ATOMIC_TYPE_CHAR:        return "char";
 231         case ATOMIC_TYPE_SCHAR:       return "signed char";
 232         case ATOMIC_TYPE_UCHAR:       return "unsigned char";
 233         case ATOMIC_TYPE_INT:         return "int";
 234         case ATOMIC_TYPE_UINT:        return "unsigned int";
 235         case ATOMIC_TYPE_SHORT:       return "short";
 236         case ATOMIC_TYPE_USHORT:      return "unsigned short";
 237         case ATOMIC_TYPE_LONG:        return "long";
 238         case ATOMIC_TYPE_ULONG:       return "unsigned long";
 239         case ATOMIC_TYPE_LONGLONG:    return "long long";
 240         case ATOMIC_TYPE_ULONGLONG:   return "unsigned long long";
 241         case ATOMIC_TYPE_LONG_DOUBLE: return "long double";
 242         case ATOMIC_TYPE_FLOAT:       return "float";
 243         case ATOMIC_TYPE_DOUBLE:      return "double";
 244         }
 245         return "INVALIDATOMIC";
 246 }
 247
 248 /**
 249  * Prints the name of an atomic type kinds.
 250  *
 251  * @param kind  The type kind.
 252  */
 253 static void print_atomic_kinds(atomic_type_kind_t kind)
 254 {
 255         const char *s = get_atomic_kind_name(kind);
 256         fputs(s, out);
 257 }
 258
 259 /**
 260  * Prints the name of an atomic type.
 261  *
 262  * @param type  The type.
 263  */
 264 static void print_atomic_type(const atomic_type_t *type)
 265 {
 266         print_type_qualifiers(type->base.qualifiers);
 267         if (type->base.qualifiers != 0)
 268                 fputc(' ', out);
 269         print_atomic_kinds(type->akind);
 270 }
 271
 272 /**
 273  * Prints the name of a complex type.
 274  *
 275  * @param type  The type.
 276  */
 277 static
 278 void print_complex_type(const complex_type_t *type)
 279 {
 280         int empty = type->base.qualifiers == 0;
 281         print_type_qualifiers(type->base.qualifiers);
 282         fputs(" _Complex " + empty, out);
 283         print_atomic_kinds(type->akind);
 284 }
 285
 286 /**
 287  * Prints the name of an imaginary type.
 288  *
 289  * @param type  The type.
 290  */
 291 static
 292 void print_imaginary_type(const imaginary_type_t *type)
 293 {
 294         int empty = type->base.qualifiers == 0;
 295         print_type_qualifiers(type->base.qualifiers);
 296         fputs(" _Imaginary " + empty, out);
 297         print_atomic_kinds(type->akind);
 298 }
 299
 300 /**
 301  * Print the first part (the prefix) of a type.
 302  *
 303  * @param type   The type to print.
 304  * @param top    true, if this is the top type, false if it's an embedded type.
 305  */
 306 static void print_function_type_pre(const function_type_t *type, bool top)
 307 {
 308         switch (type->linkage) {
 309                 case LINKAGE_INVALID:
 310                         break;
 311
 312                 case LINKAGE_C:
 313                         if (c_mode & _CXX)
 314                                 fputs("extern \"C\" ",   out);
 315                         break;
 316
 317                 case LINKAGE_CXX:
 318                         if (!(c_mode & _CXX))
 319                                 fputs("extern \"C++\" ", out);
 320                         break;
 321         }
 322
 323         print_type_qualifiers(type->base.qualifiers);
 324         if (type->base.qualifiers != 0)
 325                 fputc(' ', out);
 326
 327         intern_print_type_pre(type->return_type, false);
 328
 329         switch (type->calling_convention) {
 330         case CC_CDECL:    fputs("__cdecl ",    out); break;
 331         case CC_STDCALL:  fputs("__stdcall ",  out); break;
 332         case CC_FASTCALL: fputs("__fastcall ", out); break;
 333         case CC_THISCALL: fputs("__thiscall ", out); break;
 334         case CC_DEFAULT:  break;
 335         }
 336
 337         /* don't emit parenthesis if we're the toplevel type... */
 338         if (!top)
 339                 fputc('(', out);
 340 }
 341
 342 /**
 343  * Print the second part (the postfix) of a type.
 344  *
 345  * @param type   The type to print.
 346  * @param top    true, if this is the top type, false if it's an embedded type.
 347  */
 348 static void print_function_type_post(const function_type_t *type,
 349                                      const scope_t *parameters, bool top)
 350 {
 351         /* don't emit parenthesis if we're the toplevel type... */
 352         if (!top)
 353                 fputc(')', out);
 354
 355         fputc('(', out);
 356         bool first = true;
 357         if (parameters == NULL) {
 358                 function_parameter_t *parameter = type->parameters;
 359                 for( ; parameter != NULL; parameter = parameter->next) {
 360                         if (first) {
 361                                 first = false;
 362                         } else {
 363                                 fputs(", ", out);
 364                         }
 365                         print_type(parameter->type);
 366                 }
 367         } else {
 368                 entity_t *parameter = parameters->entities;
 369                 for (; parameter != NULL; parameter = parameter->base.next) {
 370                         if (first) {
 371                                 first = false;
 372                         } else {
 373                                 fputs(", ", out);
 374                         }
 375                         assert(is_declaration(parameter));
 376                         const type_t *const type = parameter->declaration.type;
 377                         if (type == NULL) {
 378                                 fputs(parameter->base.symbol->string, out);
 379                         } else {
 380                                 print_type_ext(type, parameter->base.symbol, NULL);
 381                         }
 382                 }
 383         }
 384         if (type->variadic) {
 385                 if (first) {
 386                         first = false;
 387                 } else {
 388                         fputs(", ", out);
 389                 }
 390                 fputs("...", out);
 391         }
 392         if (first && !type->unspecified_parameters) {
 393                 fputs("void", out);
 394         }
 395         fputc(')', out);
 396
 397         intern_print_type_post(type->return_type, false);
 398 }
 399
 400 /**
 401  * Prints the prefix part of a pointer type.
 402  *
 403  * @param type   The pointer type.
 404  */
 405 static void print_pointer_type_pre(const pointer_type_t *type)
 406 {
 407         intern_print_type_pre(type->points_to, false);
 408         variable_t *const variable = type->base_variable;
 409         if (variable != NULL) {
 410                 fputs(" __based(", out);
 411                 fputs(variable->base.base.symbol->string, out);
 412                 fputs(") ", out);
 413         }
 414         fputc('*', out);
 415         type_qualifiers_t const qual = type->base.qualifiers;
 416         if (qual != 0)
 417                 fputc(' ', out);
 418         print_type_qualifiers(qual);
 419 }
 420
 421 /**
 422  * Prints the prefix part of a reference type.
 423  *
 424  * @param type   The reference type.
 425  */
 426 static void print_reference_type_pre(const reference_type_t *type)
 427 {
 428         intern_print_type_pre(type->refers_to, false);
 429         fputc('&', out);
 430 }
 431
 432 /**
 433  * Prints the postfix part of a pointer type.
 434  *
 435  * @param type   The pointer type.
 436  */
 437 static void print_pointer_type_post(const pointer_type_t *type)
 438 {
 439         intern_print_type_post(type->points_to, false);
 440 }
 441
 442 /**
 443  * Prints the postfix part of a reference type.
 444  *
 445  * @param type   The reference type.
 446  */
 447 static void print_reference_type_post(const reference_type_t *type)
 448 {
 449         intern_print_type_post(type->refers_to, false);
 450 }
 451
 452 /**
 453  * Prints the prefix part of an array type.
 454  *
 455  * @param type   The array type.
 456  */
 457 static void print_array_type_pre(const array_type_t *type)
 458 {
 459         intern_print_type_pre(type->element_type, false);
 460 }
 461
 462 /**
 463  * Prints the postfix part of an array type.
 464  *
 465  * @param type   The array type.
 466  */
 467 static void print_array_type_post(const array_type_t *type)
 468 {
 469         fputc('[', out);
 470         if (type->is_static) {
 471                 fputs("static ", out);
 472         }
 473         print_type_qualifiers(type->base.qualifiers);
 474         if (type->base.qualifiers != 0)
 475                 fputc(' ', out);
 476         if (type->size_expression != NULL
 477                         && (print_implicit_array_size || !type->has_implicit_size)) {
 478                 print_expression(type->size_expression);
 479         }
 480         fputc(']', out);
 481         intern_print_type_post(type->element_type, false);
 482 }
 483
 484 /**
 485  * Prints the postfix part of a bitfield type.
 486  *
 487  * @param type   The array type.
 488  */
 489 static void print_bitfield_type_post(const bitfield_type_t *type)
 490 {
 491         fputs(" : ", out);
 492         print_expression(type->size_expression);
 493         intern_print_type_post(type->base_type, false);
 494 }
 495
 496 /**
 497  * Prints an enum definition.
 498  *
 499  * @param declaration  The enum's type declaration.
 500  */
 501 void print_enum_definition(const enum_t *enume)
 502 {
 503         fputs("{\n", out);
 504
 505         change_indent(1);
 506
 507         entity_t *entry = enume->base.next;
 508         for( ; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
 509                entry = entry->base.next) {
 510
 511                 print_indent();
 512                 fputs(entry->base.symbol->string, out);
 513                 if (entry->enum_value.value != NULL) {
 514                         fputs(" = ", out);
 515
 516                         /* skip the implicit cast */
 517                         expression_t *expression = entry->enum_value.value;
 518                         if (expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
 519                                 expression = expression->unary.value;
 520                         }
 521                         print_expression(expression);
 522                 }
 523                 fputs(",\n", out);
 524         }
 525
 526         change_indent(-1);
 527         print_indent();
 528         fputc('}', out);
 529 }
 530
 531 /**
 532  * Prints an enum type.
 533  *
 534  * @param type  The enum type.
 535  */
 536 static void print_type_enum(const enum_type_t *type)
 537 {
 538         int empty = type->base.qualifiers == 0;
 539         print_type_qualifiers(type->base.qualifiers);
 540         fputs(" enum " + empty, out);
 541
 542         enum_t   *enume  = type->enume;
 543         symbol_t *symbol = enume->base.symbol;
 544         if (symbol != NULL) {
 545                 fputs(symbol->string, out);
 546         } else {
 547                 print_enum_definition(enume);
 548         }
 549 }
 550
 551 /**
 552  * Print the compound part of a compound type.
 553  */
 554 void print_compound_definition(const compound_t *compound)
 555 {
 556         fputs("{\n", out);
 557         change_indent(1);
 558
 559         entity_t *entity = compound->members.entities;
 560         for( ; entity != NULL; entity = entity->base.next) {
 561                 if (entity->kind != ENTITY_COMPOUND_MEMBER)
 562                         continue;
 563
 564                 print_indent();
 565                 print_entity(entity);
 566                 fputc('\n', out);
 567         }
 568
 569         change_indent(-1);
 570         print_indent();
 571         fputc('}', out);
 572         if (compound->modifiers & DM_TRANSPARENT_UNION) {
 573                 fputs("__attribute__((__transparent_union__))", out);
 574         }
 575 }
 576
 577 /**
 578  * Prints a compound type.
 579  *
 580  * @param type  The compound type.
 581  */
 582 static void print_compound_type(const compound_type_t *type)
 583 {
 584         int empty = type->base.qualifiers == 0;
 585         print_type_qualifiers(type->base.qualifiers);
 586
 587         if (type->base.kind == TYPE_COMPOUND_STRUCT) {
 588                 fputs(" struct " + empty, out);
 589         } else {
 590                 assert(type->base.kind == TYPE_COMPOUND_UNION);
 591                 fputs(" union " + empty, out);
 592         }
 593
 594         compound_t *compound = type->compound;
 595         symbol_t   *symbol   = compound->base.symbol;
 596         if (symbol != NULL) {
 597                 fputs(symbol->string, out);
 598         } else {
 599                 print_compound_definition(compound);
 600         }
 601 }
 602
 603 /**
 604  * Prints the prefix part of a typedef type.
 605  *
 606  * @param type   The typedef type.
 607  */
 608 static void print_typedef_type_pre(const typedef_type_t *const type)
 609 {
 610         print_type_qualifiers(type->base.qualifiers);
 611         if (type->base.qualifiers != 0)
 612                 fputc(' ', out);
 613         fputs(type->typedefe->base.symbol->string, out);
 614 }
 615
 616 /**
 617  * Prints the prefix part of a typeof type.
 618  *
 619  * @param type   The typeof type.
 620  */
 621 static void print_typeof_type_pre(const typeof_type_t *const type)
 622 {
 623         fputs("typeof(", out);
 624         if (type->expression != NULL) {
 625                 print_expression(type->expression);
 626         } else {
 627                 print_type(type->typeof_type);
 628         }
 629         fputc(')', out);
 630 }
 631
 632 /**
 633  * Prints the prefix part of a type.
 634  *
 635  * @param type   The type.
 636  * @param top    true if we print the toplevel type, false else.
 637  */
 638 static void intern_print_type_pre(const type_t *const type, const bool top)
 639 {
 640         switch(type->kind) {
 641         case TYPE_ERROR:
 642                 fputs("<error>", out);
 643                 return;
 644         case TYPE_INVALID:
 645                 fputs("<invalid>", out);
 646                 return;
 647         case TYPE_ENUM:
 648                 print_type_enum(&type->enumt);
 649                 return;
 650         case TYPE_ATOMIC:
 651                 print_atomic_type(&type->atomic);
 652                 return;
 653         case TYPE_COMPLEX:
 654                 print_complex_type(&type->complex);
 655                 return;
 656         case TYPE_IMAGINARY:
 657                 print_imaginary_type(&type->imaginary);
 658                 return;
 659         case TYPE_COMPOUND_STRUCT:
 660         case TYPE_COMPOUND_UNION:
 661                 print_compound_type(&type->compound);
 662                 return;
 663         case TYPE_BUILTIN:
 664                 fputs(type->builtin.symbol->string, out);
 665                 return;
 666         case TYPE_FUNCTION:
 667                 print_function_type_pre(&type->function, top);
 668                 return;
 669         case TYPE_POINTER:
 670                 print_pointer_type_pre(&type->pointer);
 671                 return;
 672         case TYPE_REFERENCE:
 673                 print_reference_type_pre(&type->reference);
 674                 return;
 675         case TYPE_BITFIELD:
 676                 intern_print_type_pre(type->bitfield.base_type, top);
 677                 return;
 678         case TYPE_ARRAY:
 679                 print_array_type_pre(&type->array);
 680                 return;
 681         case TYPE_TYPEDEF:
 682                 print_typedef_type_pre(&type->typedeft);
 683                 return;
 684         case TYPE_TYPEOF:
 685                 print_typeof_type_pre(&type->typeoft);
 686                 return;
 687         }
 688         fputs("unknown", out);
 689 }
 690
 691 /**
 692  * Prints the postfix part of a type.
 693  *
 694  * @param type   The type.
 695  * @param top    true if we print the toplevel type, false else.
 696  */
 697 static void intern_print_type_post(const type_t *const type, const bool top)
 698 {
 699         switch(type->kind) {
 700         case TYPE_FUNCTION:
 701                 print_function_type_post(&type->function, NULL, top);
 702                 return;
 703         case TYPE_POINTER:
 704                 print_pointer_type_post(&type->pointer);
 705                 return;
 706         case TYPE_REFERENCE:
 707                 print_reference_type_post(&type->reference);
 708                 return;
 709         case TYPE_ARRAY:
 710                 print_array_type_post(&type->array);
 711                 return;
 712         case TYPE_BITFIELD:
 713                 print_bitfield_type_post(&type->bitfield);
 714                 return;
 715         case TYPE_ERROR:
 716         case TYPE_INVALID:
 717         case TYPE_ATOMIC:
 718         case TYPE_COMPLEX:
 719         case TYPE_IMAGINARY:
 720         case TYPE_ENUM:
 721         case TYPE_COMPOUND_STRUCT:
 722         case TYPE_COMPOUND_UNION:
 723         case TYPE_BUILTIN:
 724         case TYPE_TYPEOF:
 725         case TYPE_TYPEDEF:
 726                 break;
 727         }
 728
 729         if (type->base.modifiers & DM_TRANSPARENT_UNION) {
 730                 fputs("__attribute__((__transparent_union__))", out);
 731         }
 732 }
 733
 734 /**
 735  * Prints a type.
 736  *
 737  * @param type   The type.
 738  */
 739 void print_type(const type_t *const type)
 740 {
 741         print_type_ext(type, NULL, NULL);
 742 }
 743
 744 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 745                     const scope_t *parameters)
 746 {
 747         if (type == NULL) {
 748                 fputs("nil type", out);
 749                 return;
 750         }
 751
 752         intern_print_type_pre(type, true);
 753         if (symbol != NULL) {
 754                 fputc(' ', out);
 755                 fputs(symbol->string, out);
 756         }
 757         if (type->kind == TYPE_FUNCTION) {
 758                 print_function_type_post(&type->function, parameters, true);
 759         } else {
 760                 intern_print_type_post(type, true);
 761         }
 762 }
 763
 764 /**
 765  * Return the size of a type AST node.
 766  *
 767  * @param type  The type.
 768  */
 769 static size_t get_type_size(const type_t *type)
 770 {
 771         switch(type->kind) {
 772         case TYPE_ATOMIC:          return sizeof(atomic_type_t);
 773         case TYPE_COMPLEX:         return sizeof(complex_type_t);
 774         case TYPE_IMAGINARY:       return sizeof(imaginary_type_t);
 775         case TYPE_COMPOUND_STRUCT:
 776         case TYPE_COMPOUND_UNION:  return sizeof(compound_type_t);
 777         case TYPE_ENUM:            return sizeof(enum_type_t);
 778         case TYPE_FUNCTION:        return sizeof(function_type_t);
 779         case TYPE_POINTER:         return sizeof(pointer_type_t);
 780         case TYPE_REFERENCE:       return sizeof(reference_type_t);
 781         case TYPE_ARRAY:           return sizeof(array_type_t);
 782         case TYPE_BUILTIN:         return sizeof(builtin_type_t);
 783         case TYPE_TYPEDEF:         return sizeof(typedef_type_t);
 784         case TYPE_TYPEOF:          return sizeof(typeof_type_t);
 785         case TYPE_BITFIELD:        return sizeof(bitfield_type_t);
 786         case TYPE_ERROR:           panic("error type found");
 787         case TYPE_INVALID:         panic("invalid type found");
 788         }
 789         panic("unknown type found");
 790 }
 791
 792 /**
 793  * Duplicates a type.
 794  *
 795  * @param type  The type to copy.
 796  * @return A copy of the type.
 797  *
 798  * @note This does not produce a deep copy!
 799  */
 800 type_t *duplicate_type(const type_t *type)
 801 {
 802         size_t size = get_type_size(type);
 803
 804         type_t *copy = obstack_alloc(type_obst, size);
 805         memcpy(copy, type, size);
 806         copy->base.firm_type = NULL;
 807
 808         return copy;
 809 }
 810
 811 /**
 812  * Returns the unqualified type of a given type.
 813  *
 814  * @param type  The type.
 815  * @returns The unqualified type.
 816  */
 817 type_t *get_unqualified_type(type_t *type)
 818 {
 819         assert(!is_typeref(type));
 820
 821         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 822                 return type;
 823
 824         type_t *unqualified_type          = duplicate_type(type);
 825         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 826
 827         return identify_new_type(unqualified_type);
 828 }
 829
 830 type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual)
 831 {
 832         type_t *type = skip_typeref(orig_type);
 833
 834         type_t *copy;
 835         if (is_type_array(type)) {
 836                 /* For array types the element type has to be adjusted */
 837                 type_t *element_type      = type->array.element_type;
 838                 type_t *qual_element_type = get_qualified_type(element_type, qual);
 839
 840                 if (qual_element_type == element_type)
 841                         return orig_type;
 842
 843                 copy                     = duplicate_type(type);
 844                 copy->array.element_type = qual_element_type;
 845         } else if (is_type_valid(type)) {
 846                 if ((type->base.qualifiers & qual) == qual)
 847                         return orig_type;
 848
 849                 copy                   = duplicate_type(type);
 850                 copy->base.qualifiers |= qual;
 851         } else {
 852                 return type;
 853         }
 854
 855         return identify_new_type(copy);
 856 }
 857
 858 /**
 859  * Check if a type is valid.
 860  *
 861  * @param type  The type to check.
 862  * @return true if type represents a valid type.
 863  */
 864 bool type_valid(const type_t *type)
 865 {
 866         return type->kind != TYPE_INVALID;
 867 }
 868
 869 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 870                                   atomic_type_flag_t flag)
 871 {
 872         assert(kind <= ATOMIC_TYPE_LAST);
 873         return (atomic_type_properties[kind].flags & flag) != 0;
 874 }
 875
 876 /**
 877  * Returns true if the given type is an integer type.
 878  *
 879  * @param type  The type to check.
 880  * @return True if type is an integer type.
 881  */
 882 bool is_type_integer(const type_t *type)
 883 {
 884         assert(!is_typeref(type));
 885
 886         if (type->kind == TYPE_ENUM)
 887                 return true;
 888         if (type->kind == TYPE_BITFIELD)
 889                 return true;
 890
 891         if (type->kind != TYPE_ATOMIC)
 892                 return false;
 893
 894         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 895 }
 896
 897 /**
 898  * Returns true if the given type is an enum type.
 899  *
 900  * @param type  The type to check.
 901  * @return True if type is an enum type.
 902  */
 903 bool is_type_enum(const type_t *type)
 904 {
 905         assert(!is_typeref(type));
 906         return type->kind == TYPE_ENUM;
 907 }
 908
 909 /**
 910  * Returns true if the given type is an floating point type.
 911  *
 912  * @param type  The type to check.
 913  * @return True if type is a floating point type.
 914  */
 915 bool is_type_float(const type_t *type)
 916 {
 917         assert(!is_typeref(type));
 918
 919         if (type->kind != TYPE_ATOMIC)
 920                 return false;
 921
 922         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 923 }
 924
 925 /**
 926  * Returns true if the given type is an complex type.
 927  *
 928  * @param type  The type to check.
 929  * @return True if type is a complex type.
 930  */
 931 bool is_type_complex(const type_t *type)
 932 {
 933         assert(!is_typeref(type));
 934
 935         if (type->kind != TYPE_ATOMIC)
 936                 return false;
 937
 938         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_COMPLEX);
 939 }
 940
 941 /**
 942  * Returns true if the given type is a signed type.
 943  *
 944  * @param type  The type to check.
 945  * @return True if type is a signed type.
 946  */
 947 bool is_type_signed(const type_t *type)
 948 {
 949         assert(!is_typeref(type));
 950
 951         /* enum types are int for now */
 952         if (type->kind == TYPE_ENUM)
 953                 return true;
 954         if (type->kind == TYPE_BITFIELD)
 955                 return is_type_signed(type->bitfield.base_type);
 956
 957         if (type->kind != TYPE_ATOMIC)
 958                 return false;
 959
 960         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 961 }
 962
 963 /**
 964  * Returns true if the given type represents an arithmetic type.
 965  *
 966  * @param type  The type to check.
 967  * @return True if type represents an arithmetic type.
 968  */
 969 bool is_type_arithmetic(const type_t *type)
 970 {
 971         assert(!is_typeref(type));
 972
 973         switch(type->kind) {
 974         case TYPE_BITFIELD:
 975         case TYPE_ENUM:
 976                 return true;
 977         case TYPE_ATOMIC:
 978                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 979         case TYPE_COMPLEX:
 980                 return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 981         case TYPE_IMAGINARY:
 982                 return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 983         default:
 984                 return false;
 985         }
 986 }
 987
 988 /**
 989  * Returns true if the given type is an integer or float type.
 990  *
 991  * @param type  The type to check.
 992  * @return True if type is an integer or float type.
 993  */
 994 bool is_type_real(const type_t *type)
 995 {
 996         /* 6.2.5 (17) */
 997         return is_type_integer(type) || is_type_float(type);
 998 }
 999
1000 /**
1001  * Returns true if the given type represents a scalar type.
1002  *
1003  * @param type  The type to check.
1004  * @return True if type represents a scalar type.
1005  */
1006 bool is_type_scalar(const type_t *type)
1007 {
1008         assert(!is_typeref(type));
1009
1010         switch (type->kind) {
1011                 case TYPE_POINTER: return true;
1012                 case TYPE_BUILTIN: return is_type_scalar(type->builtin.real_type);
1013                 default:           break;
1014         }
1015
1016         return is_type_arithmetic(type);
1017 }
1018
1019 /**
1020  * Check if a given type is incomplete.
1021  *
1022  * @param type  The type to check.
1023  * @return True if the given type is incomplete (ie. just forward).
1024  */
1025 bool is_type_incomplete(const type_t *type)
1026 {
1027         assert(!is_typeref(type));
1028
1029         switch(type->kind) {
1030         case TYPE_COMPOUND_STRUCT:
1031         case TYPE_COMPOUND_UNION: {
1032                 const compound_type_t *compound_type = &type->compound;
1033                 return !compound_type->compound->complete;
1034         }
1035         case TYPE_ENUM:
1036                 return false;
1037
1038         case TYPE_ARRAY:
1039                 return type->array.size_expression == NULL
1040                         && !type->array.size_constant;
1041
1042         case TYPE_ATOMIC:
1043                 return type->atomic.akind == ATOMIC_TYPE_VOID;
1044
1045         case TYPE_COMPLEX:
1046                 return type->complex.akind == ATOMIC_TYPE_VOID;
1047
1048         case TYPE_IMAGINARY:
1049                 return type->imaginary.akind == ATOMIC_TYPE_VOID;
1050
1051         case TYPE_BITFIELD:
1052         case TYPE_FUNCTION:
1053         case TYPE_POINTER:
1054         case TYPE_REFERENCE:
1055         case TYPE_BUILTIN:
1056         case TYPE_ERROR:
1057                 return false;
1058
1059         case TYPE_TYPEDEF:
1060         case TYPE_TYPEOF:
1061                 panic("is_type_incomplete called without typerefs skipped");
1062         case TYPE_INVALID:
1063                 break;
1064         }
1065
1066         panic("invalid type found");
1067 }
1068
1069 bool is_type_object(const type_t *type)
1070 {
1071         return !is_type_function(type) && !is_type_incomplete(type);
1072 }
1073
1074 /**
1075  * Check if two function types are compatible.
1076  */
1077 static bool function_types_compatible(const function_type_t *func1,
1078                                       const function_type_t *func2)
1079 {
1080         const type_t* const ret1 = skip_typeref(func1->return_type);
1081         const type_t* const ret2 = skip_typeref(func2->return_type);
1082         if (!types_compatible(ret1, ret2))
1083                 return false;
1084
1085         if (func1->linkage != func2->linkage)
1086                 return false;
1087
1088         if (func1->calling_convention != func2->calling_convention)
1089                 return false;
1090
1091         /* can parameters be compared? */
1092         if (func1->unspecified_parameters || func2->unspecified_parameters)
1093                 return true;
1094
1095         if (func1->variadic != func2->variadic)
1096                 return false;
1097
1098         /* TODO: handling of unspecified parameters not correct yet */
1099
1100         /* all argument types must be compatible */
1101         function_parameter_t *parameter1 = func1->parameters;
1102         function_parameter_t *parameter2 = func2->parameters;
1103         for ( ; parameter1 != NULL && parameter2 != NULL;
1104                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
1105                 type_t *parameter1_type = skip_typeref(parameter1->type);
1106                 type_t *parameter2_type = skip_typeref(parameter2->type);
1107
1108                 parameter1_type = get_unqualified_type(parameter1_type);
1109                 parameter2_type = get_unqualified_type(parameter2_type);
1110
1111                 if (!types_compatible(parameter1_type, parameter2_type))
1112                         return false;
1113         }
1114         /* same number of arguments? */
1115         if (parameter1 != NULL || parameter2 != NULL)
1116                 return false;
1117
1118         return true;
1119 }
1120
1121 /**
1122  * Check if two array types are compatible.
1123  */
1124 static bool array_types_compatible(const array_type_t *array1,
1125                                    const array_type_t *array2)
1126 {
1127         type_t *element_type1 = skip_typeref(array1->element_type);
1128         type_t *element_type2 = skip_typeref(array2->element_type);
1129         if (!types_compatible(element_type1, element_type2))
1130                 return false;
1131
1132         if (!array1->size_constant || !array2->size_constant)
1133                 return true;
1134
1135         return array1->size == array2->size;
1136 }
1137
1138 /**
1139  * Check if two types are compatible.
1140  */
1141 bool types_compatible(const type_t *type1, const type_t *type2)
1142 {
1143         assert(!is_typeref(type1));
1144         assert(!is_typeref(type2));
1145
1146         /* shortcut: the same type is always compatible */
1147         if (type1 == type2)
1148                 return true;
1149
1150         if (!is_type_valid(type1) || !is_type_valid(type2))
1151                 return true;
1152
1153         if (type1->base.qualifiers != type2->base.qualifiers)
1154                 return false;
1155         if (type1->kind != type2->kind)
1156                 return false;
1157
1158         switch (type1->kind) {
1159         case TYPE_FUNCTION:
1160                 return function_types_compatible(&type1->function, &type2->function);
1161         case TYPE_ATOMIC:
1162                 return type1->atomic.akind == type2->atomic.akind;
1163         case TYPE_COMPLEX:
1164                 return type1->complex.akind == type2->complex.akind;
1165         case TYPE_IMAGINARY:
1166                 return type1->imaginary.akind == type2->imaginary.akind;
1167         case TYPE_ARRAY:
1168                 return array_types_compatible(&type1->array, &type2->array);
1169
1170         case TYPE_POINTER: {
1171                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
1172                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
1173                 return types_compatible(to1, to2);
1174         }
1175
1176         case TYPE_REFERENCE: {
1177                 const type_t *const to1 = skip_typeref(type1->reference.refers_to);
1178                 const type_t *const to2 = skip_typeref(type2->reference.refers_to);
1179                 return types_compatible(to1, to2);
1180         }
1181
1182         case TYPE_COMPOUND_STRUCT:
1183         case TYPE_COMPOUND_UNION:
1184         case TYPE_ENUM:
1185         case TYPE_BUILTIN:
1186                 /* TODO: not implemented */
1187                 break;
1188
1189         case TYPE_BITFIELD:
1190                 /* not sure if this makes sense or is even needed, implement it if you
1191                  * really need it! */
1192                 panic("type compatibility check for bitfield type");
1193
1194         case TYPE_ERROR:
1195                 /* Hmm, the error type should be compatible to all other types */
1196                 return true;
1197         case TYPE_INVALID:
1198                 panic("invalid type found in compatible types");
1199         case TYPE_TYPEDEF:
1200         case TYPE_TYPEOF:
1201                 panic("typerefs not skipped in compatible types?!?");
1202         }
1203
1204         /* TODO: incomplete */
1205         return false;
1206 }
1207
1208 /**
1209  * Skip all typerefs and return the underlying type.
1210  */
1211 type_t *skip_typeref(type_t *type)
1212 {
1213         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1214         type_modifiers_t  modifiers  = TYPE_MODIFIER_NONE;
1215         il_alignment_t    alignment  = 0;
1216
1217         while (true) {
1218                 if (alignment < type->base.alignment)
1219                         alignment = type->base.alignment;
1220
1221                 switch (type->kind) {
1222                 case TYPE_ERROR:
1223                         return type;
1224                 case TYPE_TYPEDEF: {
1225                         qualifiers |= type->base.qualifiers;
1226                         modifiers  |= type->base.modifiers;
1227
1228                         const typedef_type_t *typedef_type = &type->typedeft;
1229                         if (typedef_type->resolved_type != NULL) {
1230                                 type = typedef_type->resolved_type;
1231                                 break;
1232                         }
1233                         type = typedef_type->typedefe->type;
1234                         continue;
1235                 }
1236                 case TYPE_TYPEOF: {
1237                         qualifiers |= type->base.qualifiers;
1238                         modifiers  |= type->base.modifiers;
1239
1240                         const typeof_type_t *typeof_type = &type->typeoft;
1241                         if (typeof_type->typeof_type != NULL) {
1242                                 type = typeof_type->typeof_type;
1243                         } else {
1244                                 type = typeof_type->expression->base.type;
1245                         }
1246                         continue;
1247                 }
1248                 default:
1249                         break;
1250                 }
1251                 break;
1252         }
1253
1254         if (qualifiers != TYPE_QUALIFIER_NONE ||
1255                         modifiers  != TYPE_MODIFIER_NONE  ||
1256                         alignment  >  type->base.alignment) {
1257                 type_t *const copy = duplicate_type(type);
1258
1259                 /* for const with typedefed array type the element type has to be
1260                  * adjusted */
1261                 if (is_type_array(copy)) {
1262                         type_t *element_type           = copy->array.element_type;
1263                         element_type                   = duplicate_type(element_type);
1264                         element_type->base.qualifiers |= qualifiers;
1265                         element_type->base.modifiers  |= modifiers;
1266                         element_type->base.alignment   = alignment;
1267                         copy->array.element_type       = element_type;
1268                 } else {
1269                         copy->base.qualifiers |= qualifiers;
1270                         copy->base.modifiers  |= modifiers;
1271                         copy->base.alignment   = alignment;
1272                 }
1273
1274                 type = identify_new_type(copy);
1275         }
1276
1277         return type;
1278 }
1279
1280 type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type)
1281 {
1282         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1283
1284         while (true) {
1285                 switch (type->base.kind) {
1286                 case TYPE_ERROR:
1287                         return TYPE_QUALIFIER_NONE;
1288                 case TYPE_TYPEDEF:
1289                         qualifiers |= type->base.qualifiers;
1290                         const typedef_type_t *typedef_type = &type->typedeft;
1291                         if (typedef_type->resolved_type != NULL)
1292                                 type = typedef_type->resolved_type;
1293                         else
1294                                 type = typedef_type->typedefe->type;
1295                         continue;
1296                 case TYPE_TYPEOF: {
1297                         const typeof_type_t *typeof_type = &type->typeoft;
1298                         if (typeof_type->typeof_type != NULL) {
1299                                 type = typeof_type->typeof_type;
1300                         } else {
1301                                 type = typeof_type->expression->base.type;
1302                         }
1303                         continue;
1304                 }
1305                 case TYPE_ARRAY:
1306                         if (skip_array_type) {
1307                                 type = type->array.element_type;
1308                                 continue;
1309                         }
1310                         break;
1311                 default:
1312                         break;
1313                 }
1314                 break;
1315         }
1316         return type->base.qualifiers | qualifiers;
1317 }
1318
1319 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1320 {
1321         assert(kind <= ATOMIC_TYPE_LAST);
1322         return atomic_type_properties[kind].size;
1323 }
1324
1325 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1326 {
1327         assert(kind <= ATOMIC_TYPE_LAST);
1328         return atomic_type_properties[kind].alignment;
1329 }
1330
1331 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1332 {
1333         assert(kind <= ATOMIC_TYPE_LAST);
1334         return atomic_type_properties[kind].flags;
1335 }
1336
1337 atomic_type_kind_t get_intptr_kind(void)
1338 {
1339         if (machine_size <= 32)
1340                 return ATOMIC_TYPE_INT;
1341         else if (machine_size <= 64)
1342                 return ATOMIC_TYPE_LONG;
1343         else
1344                 return ATOMIC_TYPE_LONGLONG;
1345 }
1346
1347 atomic_type_kind_t get_uintptr_kind(void)
1348 {
1349         if (machine_size <= 32)
1350                 return ATOMIC_TYPE_UINT;
1351         else if (machine_size <= 64)
1352                 return ATOMIC_TYPE_ULONG;
1353         else
1354                 return ATOMIC_TYPE_ULONGLONG;
1355 }
1356
1357 /**
1358  * Find the atomic type kind representing a given size (signed).
1359  */
1360 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size)
1361 {
1362         static atomic_type_kind_t kinds[32];
1363
1364         assert(size < 32);
1365         atomic_type_kind_t kind = kinds[size];
1366         if (kind == ATOMIC_TYPE_INVALID) {
1367                 static const atomic_type_kind_t possible_kinds[] = {
1368                         ATOMIC_TYPE_SCHAR,
1369                         ATOMIC_TYPE_SHORT,
1370                         ATOMIC_TYPE_INT,
1371                         ATOMIC_TYPE_LONG,
1372                         ATOMIC_TYPE_LONGLONG
1373                 };
1374                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1375                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1376                                 kind = possible_kinds[i];
1377                                 break;
1378                         }
1379                 }
1380                 kinds[size] = kind;
1381         }
1382         return kind;
1383 }
1384
1385 /**
1386  * Find the atomic type kind representing a given size (signed).
1387  */
1388 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size)
1389 {
1390         static atomic_type_kind_t kinds[32];
1391
1392         assert(size < 32);
1393         atomic_type_kind_t kind = kinds[size];
1394         if (kind == ATOMIC_TYPE_INVALID) {
1395                 static const atomic_type_kind_t possible_kinds[] = {
1396                         ATOMIC_TYPE_UCHAR,
1397                         ATOMIC_TYPE_USHORT,
1398                         ATOMIC_TYPE_UINT,
1399                         ATOMIC_TYPE_ULONG,
1400                         ATOMIC_TYPE_ULONGLONG
1401                 };
1402                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1403                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1404                                 kind = possible_kinds[i];
1405                                 break;
1406                         }
1407                 }
1408                 kinds[size] = kind;
1409         }
1410         return kind;
1411 }
1412
1413 /**
1414  * Hash the given type and return the "singleton" version
1415  * of it.
1416  */
1417 type_t *identify_new_type(type_t *type)
1418 {
1419         type_t *result = typehash_insert(type);
1420         if (result != type) {
1421                 obstack_free(type_obst, type);
1422         }
1423         return result;
1424 }
1425
1426 /**
1427  * Creates a new atomic type.
1428  *
1429  * @param akind       The kind of the atomic type.
1430  * @param qualifiers  Type qualifiers for the new type.
1431  */
1432 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1433 {
1434         type_t *type = obstack_alloc(type_obst, sizeof(atomic_type_t));
1435         memset(type, 0, sizeof(atomic_type_t));
1436
1437         type->kind            = TYPE_ATOMIC;
1438         type->base.size       = get_atomic_type_size(akind);
1439         type->base.alignment  = get_atomic_type_alignment(akind);
1440         type->base.qualifiers = qualifiers;
1441         type->atomic.akind    = akind;
1442
1443         return identify_new_type(type);
1444 }
1445
1446 /**
1447  * Creates a new complex type.
1448  *
1449  * @param akind       The kind of the atomic type.
1450  * @param qualifiers  Type qualifiers for the new type.
1451  */
1452 type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1453 {
1454         type_t *type = obstack_alloc(type_obst, sizeof(complex_type_t));
1455         memset(type, 0, sizeof(complex_type_t));
1456
1457         type->kind            = TYPE_COMPLEX;
1458         type->base.qualifiers = qualifiers;
1459         type->base.alignment  = get_atomic_type_alignment(akind);
1460         type->complex.akind   = akind;
1461
1462         return identify_new_type(type);
1463 }
1464
1465 /**
1466  * Creates a new imaginary type.
1467  *
1468  * @param akind       The kind of the atomic type.
1469  * @param qualifiers  Type qualifiers for the new type.
1470  */
1471 type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1472 {
1473         type_t *type = obstack_alloc(type_obst, sizeof(imaginary_type_t));
1474         memset(type, 0, sizeof(imaginary_type_t));
1475
1476         type->kind            = TYPE_IMAGINARY;
1477         type->base.qualifiers = qualifiers;
1478         type->base.alignment  = get_atomic_type_alignment(akind);
1479         type->imaginary.akind = akind;
1480
1481         return identify_new_type(type);
1482 }
1483
1484 /**
1485  * Creates a new pointer type.
1486  *
1487  * @param points_to   The points-to type for the new type.
1488  * @param qualifiers  Type qualifiers for the new type.
1489  */
1490 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1491 {
1492         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1493         memset(type, 0, sizeof(pointer_type_t));
1494
1495         type->kind                  = TYPE_POINTER;
1496         type->base.qualifiers       = qualifiers;
1497         type->base.alignment        = 0;
1498         type->pointer.points_to     = points_to;
1499         type->pointer.base_variable = NULL;
1500
1501         return identify_new_type(type);
1502 }
1503
1504 /**
1505  * Creates a new reference type.
1506  *
1507  * @param refers_to   The referred-to type for the new type.
1508  */
1509 type_t *make_reference_type(type_t *refers_to)
1510 {
1511         type_t *type = obstack_alloc(type_obst, sizeof(reference_type_t));
1512         memset(type, 0, sizeof(reference_type_t));
1513
1514         type->kind                = TYPE_REFERENCE;
1515         type->base.qualifiers     = 0;
1516         type->base.alignment      = 0;
1517         type->reference.refers_to = refers_to;
1518
1519         return identify_new_type(type);
1520 }
1521
1522 /**
1523  * Creates a new based pointer type.
1524  *
1525  * @param points_to   The points-to type for the new type.
1526  * @param qualifiers  Type qualifiers for the new type.
1527  * @param variable    The based variable
1528  */
1529 type_t *make_based_pointer_type(type_t *points_to,
1530                                                                 type_qualifiers_t qualifiers, variable_t *variable)
1531 {
1532         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1533         memset(type, 0, sizeof(pointer_type_t));
1534
1535         type->kind                  = TYPE_POINTER;
1536         type->base.qualifiers       = qualifiers;
1537         type->base.alignment        = 0;
1538         type->pointer.points_to     = points_to;
1539         type->pointer.base_variable = variable;
1540
1541         return identify_new_type(type);
1542 }
1543
1544
1545 type_t *make_array_type(type_t *element_type, size_t size,
1546                         type_qualifiers_t qualifiers)
1547 {
1548         type_t *type = obstack_alloc(type_obst, sizeof(array_type_t));
1549         memset(type, 0, sizeof(array_type_t));
1550
1551         type->kind                = TYPE_ARRAY;
1552         type->base.qualifiers     = qualifiers;
1553         type->base.alignment      = 0;
1554         type->array.element_type  = element_type;
1555         type->array.size          = size;
1556         type->array.size_constant = true;
1557
1558         return identify_new_type(type);
1559 }
1560
1561 /**
1562  * Debug helper. Prints the given type to stdout.
1563  */
1564 static __attribute__((unused))
1565 void dbg_type(const type_t *type)
1566 {
1567         FILE *old_out = out;
1568         out = stderr;
1569         print_type(type);
1570         puts("\n");
1571         fflush(stderr);
1572         out = old_out;
1573 }