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 (parameter->kind != ENTITY_PARAMETER)
 371                                 continue;
 372
 373                         if (first) {
 374                                 first = false;
 375                         } else {
 376                                 fputs(", ", out);
 377                         }
 378                         const type_t *const type = parameter->declaration.type;
 379                         if (type == NULL) {
 380                                 fputs(parameter->base.symbol->string, out);
 381                         } else {
 382                                 print_type_ext(type, parameter->base.symbol, NULL);
 383                         }
 384                 }
 385         }
 386         if (type->variadic) {
 387                 if (first) {
 388                         first = false;
 389                 } else {
 390                         fputs(", ", out);
 391                 }
 392                 fputs("...", out);
 393         }
 394         if (first && !type->unspecified_parameters) {
 395                 fputs("void", out);
 396         }
 397         fputc(')', out);
 398
 399         intern_print_type_post(type->return_type, false);
 400 }
 401
 402 /**
 403  * Prints the prefix part of a pointer type.
 404  *
 405  * @param type   The pointer type.
 406  */
 407 static void print_pointer_type_pre(const pointer_type_t *type)
 408 {
 409         intern_print_type_pre(type->points_to, false);
 410         variable_t *const variable = type->base_variable;
 411         if (variable != NULL) {
 412                 fputs(" __based(", out);
 413                 fputs(variable->base.base.symbol->string, out);
 414                 fputs(") ", out);
 415         }
 416         fputc('*', out);
 417         type_qualifiers_t const qual = type->base.qualifiers;
 418         if (qual != 0)
 419                 fputc(' ', out);
 420         print_type_qualifiers(qual);
 421 }
 422
 423 /**
 424  * Prints the prefix part of a reference type.
 425  *
 426  * @param type   The reference type.
 427  */
 428 static void print_reference_type_pre(const reference_type_t *type)
 429 {
 430         intern_print_type_pre(type->refers_to, false);
 431         fputc('&', out);
 432 }
 433
 434 /**
 435  * Prints the postfix part of a pointer type.
 436  *
 437  * @param type   The pointer type.
 438  */
 439 static void print_pointer_type_post(const pointer_type_t *type)
 440 {
 441         intern_print_type_post(type->points_to, false);
 442 }
 443
 444 /**
 445  * Prints the postfix part of a reference type.
 446  *
 447  * @param type   The reference type.
 448  */
 449 static void print_reference_type_post(const reference_type_t *type)
 450 {
 451         intern_print_type_post(type->refers_to, false);
 452 }
 453
 454 /**
 455  * Prints the prefix part of an array type.
 456  *
 457  * @param type   The array type.
 458  */
 459 static void print_array_type_pre(const array_type_t *type)
 460 {
 461         intern_print_type_pre(type->element_type, false);
 462 }
 463
 464 /**
 465  * Prints the postfix part of an array type.
 466  *
 467  * @param type   The array type.
 468  */
 469 static void print_array_type_post(const array_type_t *type)
 470 {
 471         fputc('[', out);
 472         if (type->is_static) {
 473                 fputs("static ", out);
 474         }
 475         print_type_qualifiers(type->base.qualifiers);
 476         if (type->base.qualifiers != 0)
 477                 fputc(' ', out);
 478         if (type->size_expression != NULL
 479                         && (print_implicit_array_size || !type->has_implicit_size)) {
 480                 print_expression(type->size_expression);
 481         }
 482         fputc(']', out);
 483         intern_print_type_post(type->element_type, false);
 484 }
 485
 486 /**
 487  * Prints the postfix part of a bitfield type.
 488  *
 489  * @param type   The array type.
 490  */
 491 static void print_bitfield_type_post(const bitfield_type_t *type)
 492 {
 493         fputs(" : ", out);
 494         print_expression(type->size_expression);
 495         intern_print_type_post(type->base_type, false);
 496 }
 497
 498 /**
 499  * Prints an enum definition.
 500  *
 501  * @param declaration  The enum's type declaration.
 502  */
 503 void print_enum_definition(const enum_t *enume)
 504 {
 505         fputs("{\n", out);
 506
 507         change_indent(1);
 508
 509         entity_t *entry = enume->base.next;
 510         for( ; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
 511                entry = entry->base.next) {
 512
 513                 print_indent();
 514                 fputs(entry->base.symbol->string, out);
 515                 if (entry->enum_value.value != NULL) {
 516                         fputs(" = ", out);
 517
 518                         /* skip the implicit cast */
 519                         expression_t *expression = entry->enum_value.value;
 520                         if (expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
 521                                 expression = expression->unary.value;
 522                         }
 523                         print_expression(expression);
 524                 }
 525                 fputs(",\n", out);
 526         }
 527
 528         change_indent(-1);
 529         print_indent();
 530         fputc('}', out);
 531 }
 532
 533 /**
 534  * Prints an enum type.
 535  *
 536  * @param type  The enum type.
 537  */
 538 static void print_type_enum(const enum_type_t *type)
 539 {
 540         int empty = type->base.qualifiers == 0;
 541         print_type_qualifiers(type->base.qualifiers);
 542         fputs(" enum " + empty, out);
 543
 544         enum_t   *enume  = type->enume;
 545         symbol_t *symbol = enume->base.symbol;
 546         if (symbol != NULL) {
 547                 fputs(symbol->string, out);
 548         } else {
 549                 print_enum_definition(enume);
 550         }
 551 }
 552
 553 /**
 554  * Print the compound part of a compound type.
 555  */
 556 void print_compound_definition(const compound_t *compound)
 557 {
 558         fputs("{\n", out);
 559         change_indent(1);
 560
 561         entity_t *entity = compound->members.entities;
 562         for( ; entity != NULL; entity = entity->base.next) {
 563                 if (entity->kind != ENTITY_COMPOUND_MEMBER)
 564                         continue;
 565
 566                 print_indent();
 567                 print_entity(entity);
 568                 fputc('\n', out);
 569         }
 570
 571         change_indent(-1);
 572         print_indent();
 573         fputc('}', out);
 574         if (compound->modifiers & DM_TRANSPARENT_UNION) {
 575                 fputs("__attribute__((__transparent_union__))", out);
 576         }
 577 }
 578
 579 /**
 580  * Prints a compound type.
 581  *
 582  * @param type  The compound type.
 583  */
 584 static void print_compound_type(const compound_type_t *type)
 585 {
 586         int empty = type->base.qualifiers == 0;
 587         print_type_qualifiers(type->base.qualifiers);
 588
 589         if (type->base.kind == TYPE_COMPOUND_STRUCT) {
 590                 fputs(" struct " + empty, out);
 591         } else {
 592                 assert(type->base.kind == TYPE_COMPOUND_UNION);
 593                 fputs(" union " + empty, out);
 594         }
 595
 596         compound_t *compound = type->compound;
 597         symbol_t   *symbol   = compound->base.symbol;
 598         if (symbol != NULL) {
 599                 fputs(symbol->string, out);
 600         } else {
 601                 print_compound_definition(compound);
 602         }
 603 }
 604
 605 /**
 606  * Prints the prefix part of a typedef type.
 607  *
 608  * @param type   The typedef type.
 609  */
 610 static void print_typedef_type_pre(const typedef_type_t *const type)
 611 {
 612         print_type_qualifiers(type->base.qualifiers);
 613         if (type->base.qualifiers != 0)
 614                 fputc(' ', out);
 615         fputs(type->typedefe->base.symbol->string, out);
 616 }
 617
 618 /**
 619  * Prints the prefix part of a typeof type.
 620  *
 621  * @param type   The typeof type.
 622  */
 623 static void print_typeof_type_pre(const typeof_type_t *const type)
 624 {
 625         fputs("typeof(", out);
 626         if (type->expression != NULL) {
 627                 print_expression(type->expression);
 628         } else {
 629                 print_type(type->typeof_type);
 630         }
 631         fputc(')', out);
 632 }
 633
 634 /**
 635  * Prints the prefix part of a type.
 636  *
 637  * @param type   The type.
 638  * @param top    true if we print the toplevel type, false else.
 639  */
 640 static void intern_print_type_pre(const type_t *const type, const bool top)
 641 {
 642         switch(type->kind) {
 643         case TYPE_ERROR:
 644                 fputs("<error>", out);
 645                 return;
 646         case TYPE_INVALID:
 647                 fputs("<invalid>", out);
 648                 return;
 649         case TYPE_ENUM:
 650                 print_type_enum(&type->enumt);
 651                 return;
 652         case TYPE_ATOMIC:
 653                 print_atomic_type(&type->atomic);
 654                 return;
 655         case TYPE_COMPLEX:
 656                 print_complex_type(&type->complex);
 657                 return;
 658         case TYPE_IMAGINARY:
 659                 print_imaginary_type(&type->imaginary);
 660                 return;
 661         case TYPE_COMPOUND_STRUCT:
 662         case TYPE_COMPOUND_UNION:
 663                 print_compound_type(&type->compound);
 664                 return;
 665         case TYPE_BUILTIN:
 666                 fputs(type->builtin.symbol->string, out);
 667                 return;
 668         case TYPE_FUNCTION:
 669                 print_function_type_pre(&type->function, top);
 670                 return;
 671         case TYPE_POINTER:
 672                 print_pointer_type_pre(&type->pointer);
 673                 return;
 674         case TYPE_REFERENCE:
 675                 print_reference_type_pre(&type->reference);
 676                 return;
 677         case TYPE_BITFIELD:
 678                 intern_print_type_pre(type->bitfield.base_type, top);
 679                 return;
 680         case TYPE_ARRAY:
 681                 print_array_type_pre(&type->array);
 682                 return;
 683         case TYPE_TYPEDEF:
 684                 print_typedef_type_pre(&type->typedeft);
 685                 return;
 686         case TYPE_TYPEOF:
 687                 print_typeof_type_pre(&type->typeoft);
 688                 return;
 689         }
 690         fputs("unknown", out);
 691 }
 692
 693 /**
 694  * Prints the postfix part of a type.
 695  *
 696  * @param type   The type.
 697  * @param top    true if we print the toplevel type, false else.
 698  */
 699 static void intern_print_type_post(const type_t *const type, const bool top)
 700 {
 701         switch(type->kind) {
 702         case TYPE_FUNCTION:
 703                 print_function_type_post(&type->function, NULL, top);
 704                 return;
 705         case TYPE_POINTER:
 706                 print_pointer_type_post(&type->pointer);
 707                 return;
 708         case TYPE_REFERENCE:
 709                 print_reference_type_post(&type->reference);
 710                 return;
 711         case TYPE_ARRAY:
 712                 print_array_type_post(&type->array);
 713                 return;
 714         case TYPE_BITFIELD:
 715                 print_bitfield_type_post(&type->bitfield);
 716                 return;
 717         case TYPE_ERROR:
 718         case TYPE_INVALID:
 719         case TYPE_ATOMIC:
 720         case TYPE_COMPLEX:
 721         case TYPE_IMAGINARY:
 722         case TYPE_ENUM:
 723         case TYPE_COMPOUND_STRUCT:
 724         case TYPE_COMPOUND_UNION:
 725         case TYPE_BUILTIN:
 726         case TYPE_TYPEOF:
 727         case TYPE_TYPEDEF:
 728                 break;
 729         }
 730
 731         if (type->base.modifiers & DM_TRANSPARENT_UNION) {
 732                 fputs("__attribute__((__transparent_union__))", out);
 733         }
 734 }
 735
 736 /**
 737  * Prints a type.
 738  *
 739  * @param type   The type.
 740  */
 741 void print_type(const type_t *const type)
 742 {
 743         print_type_ext(type, NULL, NULL);
 744 }
 745
 746 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 747                     const scope_t *parameters)
 748 {
 749         if (type == NULL) {
 750                 fputs("nil type", out);
 751                 return;
 752         }
 753
 754         intern_print_type_pre(type, true);
 755         if (symbol != NULL) {
 756                 fputc(' ', out);
 757                 fputs(symbol->string, out);
 758         }
 759         if (type->kind == TYPE_FUNCTION) {
 760                 print_function_type_post(&type->function, parameters, true);
 761         } else {
 762                 intern_print_type_post(type, true);
 763         }
 764 }
 765
 766 /**
 767  * Return the size of a type AST node.
 768  *
 769  * @param type  The type.
 770  */
 771 static size_t get_type_size(const type_t *type)
 772 {
 773         switch(type->kind) {
 774         case TYPE_ATOMIC:          return sizeof(atomic_type_t);
 775         case TYPE_COMPLEX:         return sizeof(complex_type_t);
 776         case TYPE_IMAGINARY:       return sizeof(imaginary_type_t);
 777         case TYPE_COMPOUND_STRUCT:
 778         case TYPE_COMPOUND_UNION:  return sizeof(compound_type_t);
 779         case TYPE_ENUM:            return sizeof(enum_type_t);
 780         case TYPE_FUNCTION:        return sizeof(function_type_t);
 781         case TYPE_POINTER:         return sizeof(pointer_type_t);
 782         case TYPE_REFERENCE:       return sizeof(reference_type_t);
 783         case TYPE_ARRAY:           return sizeof(array_type_t);
 784         case TYPE_BUILTIN:         return sizeof(builtin_type_t);
 785         case TYPE_TYPEDEF:         return sizeof(typedef_type_t);
 786         case TYPE_TYPEOF:          return sizeof(typeof_type_t);
 787         case TYPE_BITFIELD:        return sizeof(bitfield_type_t);
 788         case TYPE_ERROR:           panic("error type found");
 789         case TYPE_INVALID:         panic("invalid type found");
 790         }
 791         panic("unknown type found");
 792 }
 793
 794 /**
 795  * Duplicates a type.
 796  *
 797  * @param type  The type to copy.
 798  * @return A copy of the type.
 799  *
 800  * @note This does not produce a deep copy!
 801  */
 802 type_t *duplicate_type(const type_t *type)
 803 {
 804         size_t size = get_type_size(type);
 805
 806         type_t *copy = obstack_alloc(type_obst, size);
 807         memcpy(copy, type, size);
 808         copy->base.firm_type = NULL;
 809
 810         return copy;
 811 }
 812
 813 /**
 814  * Returns the unqualified type of a given type.
 815  *
 816  * @param type  The type.
 817  * @returns The unqualified type.
 818  */
 819 type_t *get_unqualified_type(type_t *type)
 820 {
 821         assert(!is_typeref(type));
 822
 823         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 824                 return type;
 825
 826         type_t *unqualified_type          = duplicate_type(type);
 827         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 828
 829         return identify_new_type(unqualified_type);
 830 }
 831
 832 type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual)
 833 {
 834         type_t *type = skip_typeref(orig_type);
 835
 836         type_t *copy;
 837         if (is_type_array(type)) {
 838                 /* For array types the element type has to be adjusted */
 839                 type_t *element_type      = type->array.element_type;
 840                 type_t *qual_element_type = get_qualified_type(element_type, qual);
 841
 842                 if (qual_element_type == element_type)
 843                         return orig_type;
 844
 845                 copy                     = duplicate_type(type);
 846                 copy->array.element_type = qual_element_type;
 847         } else if (is_type_valid(type)) {
 848                 if ((type->base.qualifiers & qual) == qual)
 849                         return orig_type;
 850
 851                 copy                   = duplicate_type(type);
 852                 copy->base.qualifiers |= qual;
 853         } else {
 854                 return type;
 855         }
 856
 857         return identify_new_type(copy);
 858 }
 859
 860 /**
 861  * Check if a type is valid.
 862  *
 863  * @param type  The type to check.
 864  * @return true if type represents a valid type.
 865  */
 866 bool type_valid(const type_t *type)
 867 {
 868         return type->kind != TYPE_INVALID;
 869 }
 870
 871 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 872                                   atomic_type_flag_t flag)
 873 {
 874         assert(kind <= ATOMIC_TYPE_LAST);
 875         return (atomic_type_properties[kind].flags & flag) != 0;
 876 }
 877
 878 /**
 879  * Returns true if the given type is an integer type.
 880  *
 881  * @param type  The type to check.
 882  * @return True if type is an integer type.
 883  */
 884 bool is_type_integer(const type_t *type)
 885 {
 886         assert(!is_typeref(type));
 887
 888         if (type->kind == TYPE_ENUM)
 889                 return true;
 890         if (type->kind == TYPE_BITFIELD)
 891                 return true;
 892
 893         if (type->kind != TYPE_ATOMIC)
 894                 return false;
 895
 896         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 897 }
 898
 899 /**
 900  * Returns true if the given type is an enum type.
 901  *
 902  * @param type  The type to check.
 903  * @return True if type is an enum type.
 904  */
 905 bool is_type_enum(const type_t *type)
 906 {
 907         assert(!is_typeref(type));
 908         return type->kind == TYPE_ENUM;
 909 }
 910
 911 /**
 912  * Returns true if the given type is an floating point type.
 913  *
 914  * @param type  The type to check.
 915  * @return True if type is a floating point type.
 916  */
 917 bool is_type_float(const type_t *type)
 918 {
 919         assert(!is_typeref(type));
 920
 921         if (type->kind != TYPE_ATOMIC)
 922                 return false;
 923
 924         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 925 }
 926
 927 /**
 928  * Returns true if the given type is an complex type.
 929  *
 930  * @param type  The type to check.
 931  * @return True if type is a complex type.
 932  */
 933 bool is_type_complex(const type_t *type)
 934 {
 935         assert(!is_typeref(type));
 936
 937         if (type->kind != TYPE_ATOMIC)
 938                 return false;
 939
 940         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_COMPLEX);
 941 }
 942
 943 /**
 944  * Returns true if the given type is a signed type.
 945  *
 946  * @param type  The type to check.
 947  * @return True if type is a signed type.
 948  */
 949 bool is_type_signed(const type_t *type)
 950 {
 951         assert(!is_typeref(type));
 952
 953         /* enum types are int for now */
 954         if (type->kind == TYPE_ENUM)
 955                 return true;
 956         if (type->kind == TYPE_BITFIELD)
 957                 return is_type_signed(type->bitfield.base_type);
 958
 959         if (type->kind != TYPE_ATOMIC)
 960                 return false;
 961
 962         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 963 }
 964
 965 /**
 966  * Returns true if the given type represents an arithmetic type.
 967  *
 968  * @param type  The type to check.
 969  * @return True if type represents an arithmetic type.
 970  */
 971 bool is_type_arithmetic(const type_t *type)
 972 {
 973         assert(!is_typeref(type));
 974
 975         switch(type->kind) {
 976         case TYPE_BITFIELD:
 977         case TYPE_ENUM:
 978                 return true;
 979         case TYPE_ATOMIC:
 980                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 981         case TYPE_COMPLEX:
 982                 return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 983         case TYPE_IMAGINARY:
 984                 return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 985         default:
 986                 return false;
 987         }
 988 }
 989
 990 /**
 991  * Returns true if the given type is an integer or float type.
 992  *
 993  * @param type  The type to check.
 994  * @return True if type is an integer or float type.
 995  */
 996 bool is_type_real(const type_t *type)
 997 {
 998         /* 6.2.5 (17) */
 999         return is_type_integer(type) || is_type_float(type);
1000 }
1001
1002 /**
1003  * Returns true if the given type represents a scalar type.
1004  *
1005  * @param type  The type to check.
1006  * @return True if type represents a scalar type.
1007  */
1008 bool is_type_scalar(const type_t *type)
1009 {
1010         assert(!is_typeref(type));
1011
1012         switch (type->kind) {
1013                 case TYPE_POINTER: return true;
1014                 case TYPE_BUILTIN: return is_type_scalar(type->builtin.real_type);
1015                 default:           break;
1016         }
1017
1018         return is_type_arithmetic(type);
1019 }
1020
1021 /**
1022  * Check if a given type is incomplete.
1023  *
1024  * @param type  The type to check.
1025  * @return True if the given type is incomplete (ie. just forward).
1026  */
1027 bool is_type_incomplete(const type_t *type)
1028 {
1029         assert(!is_typeref(type));
1030
1031         switch(type->kind) {
1032         case TYPE_COMPOUND_STRUCT:
1033         case TYPE_COMPOUND_UNION: {
1034                 const compound_type_t *compound_type = &type->compound;
1035                 return !compound_type->compound->complete;
1036         }
1037         case TYPE_ENUM:
1038                 return false;
1039
1040         case TYPE_ARRAY:
1041                 return type->array.size_expression == NULL
1042                         && !type->array.size_constant;
1043
1044         case TYPE_ATOMIC:
1045                 return type->atomic.akind == ATOMIC_TYPE_VOID;
1046
1047         case TYPE_COMPLEX:
1048                 return type->complex.akind == ATOMIC_TYPE_VOID;
1049
1050         case TYPE_IMAGINARY:
1051                 return type->imaginary.akind == ATOMIC_TYPE_VOID;
1052
1053         case TYPE_BITFIELD:
1054         case TYPE_FUNCTION:
1055         case TYPE_POINTER:
1056         case TYPE_REFERENCE:
1057         case TYPE_BUILTIN:
1058         case TYPE_ERROR:
1059                 return false;
1060
1061         case TYPE_TYPEDEF:
1062         case TYPE_TYPEOF:
1063                 panic("is_type_incomplete called without typerefs skipped");
1064         case TYPE_INVALID:
1065                 break;
1066         }
1067
1068         panic("invalid type found");
1069 }
1070
1071 bool is_type_object(const type_t *type)
1072 {
1073         return !is_type_function(type) && !is_type_incomplete(type);
1074 }
1075
1076 /**
1077  * Check if two function types are compatible.
1078  */
1079 static bool function_types_compatible(const function_type_t *func1,
1080                                       const function_type_t *func2)
1081 {
1082         const type_t* const ret1 = skip_typeref(func1->return_type);
1083         const type_t* const ret2 = skip_typeref(func2->return_type);
1084         if (!types_compatible(ret1, ret2))
1085                 return false;
1086
1087         if (func1->linkage != func2->linkage)
1088                 return false;
1089
1090         if (func1->calling_convention != func2->calling_convention)
1091                 return false;
1092
1093         /* can parameters be compared? */
1094         if (func1->unspecified_parameters || func2->unspecified_parameters)
1095                 return true;
1096
1097         if (func1->variadic != func2->variadic)
1098                 return false;
1099
1100         /* TODO: handling of unspecified parameters not correct yet */
1101
1102         /* all argument types must be compatible */
1103         function_parameter_t *parameter1 = func1->parameters;
1104         function_parameter_t *parameter2 = func2->parameters;
1105         for ( ; parameter1 != NULL && parameter2 != NULL;
1106                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
1107                 type_t *parameter1_type = skip_typeref(parameter1->type);
1108                 type_t *parameter2_type = skip_typeref(parameter2->type);
1109
1110                 parameter1_type = get_unqualified_type(parameter1_type);
1111                 parameter2_type = get_unqualified_type(parameter2_type);
1112
1113                 if (!types_compatible(parameter1_type, parameter2_type))
1114                         return false;
1115         }
1116         /* same number of arguments? */
1117         if (parameter1 != NULL || parameter2 != NULL)
1118                 return false;
1119
1120         return true;
1121 }
1122
1123 /**
1124  * Check if two array types are compatible.
1125  */
1126 static bool array_types_compatible(const array_type_t *array1,
1127                                    const array_type_t *array2)
1128 {
1129         type_t *element_type1 = skip_typeref(array1->element_type);
1130         type_t *element_type2 = skip_typeref(array2->element_type);
1131         if (!types_compatible(element_type1, element_type2))
1132                 return false;
1133
1134         if (!array1->size_constant || !array2->size_constant)
1135                 return true;
1136
1137         return array1->size == array2->size;
1138 }
1139
1140 /**
1141  * Check if two types are compatible.
1142  */
1143 bool types_compatible(const type_t *type1, const type_t *type2)
1144 {
1145         assert(!is_typeref(type1));
1146         assert(!is_typeref(type2));
1147
1148         /* shortcut: the same type is always compatible */
1149         if (type1 == type2)
1150                 return true;
1151
1152         if (!is_type_valid(type1) || !is_type_valid(type2))
1153                 return true;
1154
1155         if (type1->base.qualifiers != type2->base.qualifiers)
1156                 return false;
1157         if (type1->kind != type2->kind)
1158                 return false;
1159
1160         switch (type1->kind) {
1161         case TYPE_FUNCTION:
1162                 return function_types_compatible(&type1->function, &type2->function);
1163         case TYPE_ATOMIC:
1164                 return type1->atomic.akind == type2->atomic.akind;
1165         case TYPE_COMPLEX:
1166                 return type1->complex.akind == type2->complex.akind;
1167         case TYPE_IMAGINARY:
1168                 return type1->imaginary.akind == type2->imaginary.akind;
1169         case TYPE_ARRAY:
1170                 return array_types_compatible(&type1->array, &type2->array);
1171
1172         case TYPE_POINTER: {
1173                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
1174                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
1175                 return types_compatible(to1, to2);
1176         }
1177
1178         case TYPE_REFERENCE: {
1179                 const type_t *const to1 = skip_typeref(type1->reference.refers_to);
1180                 const type_t *const to2 = skip_typeref(type2->reference.refers_to);
1181                 return types_compatible(to1, to2);
1182         }
1183
1184         case TYPE_COMPOUND_STRUCT:
1185         case TYPE_COMPOUND_UNION:
1186         case TYPE_ENUM:
1187         case TYPE_BUILTIN:
1188                 /* TODO: not implemented */
1189                 break;
1190
1191         case TYPE_BITFIELD:
1192                 /* not sure if this makes sense or is even needed, implement it if you
1193                  * really need it! */
1194                 panic("type compatibility check for bitfield type");
1195
1196         case TYPE_ERROR:
1197                 /* Hmm, the error type should be compatible to all other types */
1198                 return true;
1199         case TYPE_INVALID:
1200                 panic("invalid type found in compatible types");
1201         case TYPE_TYPEDEF:
1202         case TYPE_TYPEOF:
1203                 panic("typerefs not skipped in compatible types?!?");
1204         }
1205
1206         /* TODO: incomplete */
1207         return false;
1208 }
1209
1210 /**
1211  * Skip all typerefs and return the underlying type.
1212  */
1213 type_t *skip_typeref(type_t *type)
1214 {
1215         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1216         type_modifiers_t  modifiers  = TYPE_MODIFIER_NONE;
1217         il_alignment_t    alignment  = 0;
1218
1219         while (true) {
1220                 if (alignment < type->base.alignment)
1221                         alignment = type->base.alignment;
1222
1223                 switch (type->kind) {
1224                 case TYPE_ERROR:
1225                         return type;
1226                 case TYPE_TYPEDEF: {
1227                         qualifiers |= type->base.qualifiers;
1228                         modifiers  |= type->base.modifiers;
1229
1230                         const typedef_type_t *typedef_type = &type->typedeft;
1231                         if (typedef_type->resolved_type != NULL) {
1232                                 type = typedef_type->resolved_type;
1233                                 break;
1234                         }
1235                         type = typedef_type->typedefe->type;
1236                         continue;
1237                 }
1238                 case TYPE_TYPEOF:
1239                         qualifiers |= type->base.qualifiers;
1240                         modifiers  |= type->base.modifiers;
1241                         type        = type->typeoft.typeof_type;
1242                         continue;
1243                 default:
1244                         break;
1245                 }
1246                 break;
1247         }
1248
1249         if (qualifiers != TYPE_QUALIFIER_NONE ||
1250                         modifiers  != TYPE_MODIFIER_NONE  ||
1251                         alignment  >  type->base.alignment) {
1252                 type_t *const copy = duplicate_type(type);
1253
1254                 /* for const with typedefed array type the element type has to be
1255                  * adjusted */
1256                 if (is_type_array(copy)) {
1257                         type_t *element_type           = copy->array.element_type;
1258                         element_type                   = duplicate_type(element_type);
1259                         element_type->base.qualifiers |= qualifiers;
1260                         element_type->base.modifiers  |= modifiers;
1261                         element_type->base.alignment   = alignment;
1262                         copy->array.element_type       = element_type;
1263                 } else {
1264                         copy->base.qualifiers |= qualifiers;
1265                         copy->base.modifiers  |= modifiers;
1266                         copy->base.alignment   = alignment;
1267                 }
1268
1269                 type = identify_new_type(copy);
1270         }
1271
1272         return type;
1273 }
1274
1275 type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type)
1276 {
1277         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1278
1279         while (true) {
1280                 switch (type->base.kind) {
1281                 case TYPE_ERROR:
1282                         return TYPE_QUALIFIER_NONE;
1283                 case TYPE_TYPEDEF:
1284                         qualifiers |= type->base.qualifiers;
1285                         const typedef_type_t *typedef_type = &type->typedeft;
1286                         if (typedef_type->resolved_type != NULL)
1287                                 type = typedef_type->resolved_type;
1288                         else
1289                                 type = typedef_type->typedefe->type;
1290                         continue;
1291                 case TYPE_TYPEOF:
1292                         type = type->typeoft.typeof_type;
1293                         continue;
1294                 case TYPE_ARRAY:
1295                         if (skip_array_type) {
1296                                 type = type->array.element_type;
1297                                 continue;
1298                         }
1299                         break;
1300                 default:
1301                         break;
1302                 }
1303                 break;
1304         }
1305         return type->base.qualifiers | qualifiers;
1306 }
1307
1308 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1309 {
1310         assert(kind <= ATOMIC_TYPE_LAST);
1311         return atomic_type_properties[kind].size;
1312 }
1313
1314 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1315 {
1316         assert(kind <= ATOMIC_TYPE_LAST);
1317         return atomic_type_properties[kind].alignment;
1318 }
1319
1320 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1321 {
1322         assert(kind <= ATOMIC_TYPE_LAST);
1323         return atomic_type_properties[kind].flags;
1324 }
1325
1326 atomic_type_kind_t get_intptr_kind(void)
1327 {
1328         if (machine_size <= 32)
1329                 return ATOMIC_TYPE_INT;
1330         else if (machine_size <= 64)
1331                 return ATOMIC_TYPE_LONG;
1332         else
1333                 return ATOMIC_TYPE_LONGLONG;
1334 }
1335
1336 atomic_type_kind_t get_uintptr_kind(void)
1337 {
1338         if (machine_size <= 32)
1339                 return ATOMIC_TYPE_UINT;
1340         else if (machine_size <= 64)
1341                 return ATOMIC_TYPE_ULONG;
1342         else
1343                 return ATOMIC_TYPE_ULONGLONG;
1344 }
1345
1346 /**
1347  * Find the atomic type kind representing a given size (signed).
1348  */
1349 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size)
1350 {
1351         static atomic_type_kind_t kinds[32];
1352
1353         assert(size < 32);
1354         atomic_type_kind_t kind = kinds[size];
1355         if (kind == ATOMIC_TYPE_INVALID) {
1356                 static const atomic_type_kind_t possible_kinds[] = {
1357                         ATOMIC_TYPE_SCHAR,
1358                         ATOMIC_TYPE_SHORT,
1359                         ATOMIC_TYPE_INT,
1360                         ATOMIC_TYPE_LONG,
1361                         ATOMIC_TYPE_LONGLONG
1362                 };
1363                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1364                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1365                                 kind = possible_kinds[i];
1366                                 break;
1367                         }
1368                 }
1369                 kinds[size] = kind;
1370         }
1371         return kind;
1372 }
1373
1374 /**
1375  * Find the atomic type kind representing a given size (signed).
1376  */
1377 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size)
1378 {
1379         static atomic_type_kind_t kinds[32];
1380
1381         assert(size < 32);
1382         atomic_type_kind_t kind = kinds[size];
1383         if (kind == ATOMIC_TYPE_INVALID) {
1384                 static const atomic_type_kind_t possible_kinds[] = {
1385                         ATOMIC_TYPE_UCHAR,
1386                         ATOMIC_TYPE_USHORT,
1387                         ATOMIC_TYPE_UINT,
1388                         ATOMIC_TYPE_ULONG,
1389                         ATOMIC_TYPE_ULONGLONG
1390                 };
1391                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1392                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1393                                 kind = possible_kinds[i];
1394                                 break;
1395                         }
1396                 }
1397                 kinds[size] = kind;
1398         }
1399         return kind;
1400 }
1401
1402 /**
1403  * Hash the given type and return the "singleton" version
1404  * of it.
1405  */
1406 type_t *identify_new_type(type_t *type)
1407 {
1408         type_t *result = typehash_insert(type);
1409         if (result != type) {
1410                 obstack_free(type_obst, type);
1411         }
1412         return result;
1413 }
1414
1415 /**
1416  * Creates a new atomic type.
1417  *
1418  * @param akind       The kind of the atomic type.
1419  * @param qualifiers  Type qualifiers for the new type.
1420  */
1421 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1422 {
1423         type_t *type = obstack_alloc(type_obst, sizeof(atomic_type_t));
1424         memset(type, 0, sizeof(atomic_type_t));
1425
1426         type->kind            = TYPE_ATOMIC;
1427         type->base.size       = get_atomic_type_size(akind);
1428         type->base.alignment  = get_atomic_type_alignment(akind);
1429         type->base.qualifiers = qualifiers;
1430         type->atomic.akind    = akind;
1431
1432         return identify_new_type(type);
1433 }
1434
1435 /**
1436  * Creates a new complex type.
1437  *
1438  * @param akind       The kind of the atomic type.
1439  * @param qualifiers  Type qualifiers for the new type.
1440  */
1441 type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1442 {
1443         type_t *type = obstack_alloc(type_obst, sizeof(complex_type_t));
1444         memset(type, 0, sizeof(complex_type_t));
1445
1446         type->kind            = TYPE_COMPLEX;
1447         type->base.qualifiers = qualifiers;
1448         type->base.alignment  = get_atomic_type_alignment(akind);
1449         type->complex.akind   = akind;
1450
1451         return identify_new_type(type);
1452 }
1453
1454 /**
1455  * Creates a new imaginary type.
1456  *
1457  * @param akind       The kind of the atomic type.
1458  * @param qualifiers  Type qualifiers for the new type.
1459  */
1460 type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1461 {
1462         type_t *type = obstack_alloc(type_obst, sizeof(imaginary_type_t));
1463         memset(type, 0, sizeof(imaginary_type_t));
1464
1465         type->kind            = TYPE_IMAGINARY;
1466         type->base.qualifiers = qualifiers;
1467         type->base.alignment  = get_atomic_type_alignment(akind);
1468         type->imaginary.akind = akind;
1469
1470         return identify_new_type(type);
1471 }
1472
1473 /**
1474  * Creates a new pointer type.
1475  *
1476  * @param points_to   The points-to type for the new type.
1477  * @param qualifiers  Type qualifiers for the new type.
1478  */
1479 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1480 {
1481         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1482         memset(type, 0, sizeof(pointer_type_t));
1483
1484         type->kind                  = TYPE_POINTER;
1485         type->base.qualifiers       = qualifiers;
1486         type->base.alignment        = 0;
1487         type->pointer.points_to     = points_to;
1488         type->pointer.base_variable = NULL;
1489
1490         return identify_new_type(type);
1491 }
1492
1493 /**
1494  * Creates a new reference type.
1495  *
1496  * @param refers_to   The referred-to type for the new type.
1497  */
1498 type_t *make_reference_type(type_t *refers_to)
1499 {
1500         type_t *type = obstack_alloc(type_obst, sizeof(reference_type_t));
1501         memset(type, 0, sizeof(reference_type_t));
1502
1503         type->kind                = TYPE_REFERENCE;
1504         type->base.qualifiers     = 0;
1505         type->base.alignment      = 0;
1506         type->reference.refers_to = refers_to;
1507
1508         return identify_new_type(type);
1509 }
1510
1511 /**
1512  * Creates a new based pointer type.
1513  *
1514  * @param points_to   The points-to type for the new type.
1515  * @param qualifiers  Type qualifiers for the new type.
1516  * @param variable    The based variable
1517  */
1518 type_t *make_based_pointer_type(type_t *points_to,
1519                                                                 type_qualifiers_t qualifiers, variable_t *variable)
1520 {
1521         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1522         memset(type, 0, sizeof(pointer_type_t));
1523
1524         type->kind                  = TYPE_POINTER;
1525         type->base.qualifiers       = qualifiers;
1526         type->base.alignment        = 0;
1527         type->pointer.points_to     = points_to;
1528         type->pointer.base_variable = variable;
1529
1530         return identify_new_type(type);
1531 }
1532
1533
1534 type_t *make_array_type(type_t *element_type, size_t size,
1535                         type_qualifiers_t qualifiers)
1536 {
1537         type_t *type = obstack_alloc(type_obst, sizeof(array_type_t));
1538         memset(type, 0, sizeof(array_type_t));
1539
1540         type->kind                = TYPE_ARRAY;
1541         type->base.qualifiers     = qualifiers;
1542         type->base.alignment      = 0;
1543         type->array.element_type  = element_type;
1544         type->array.size          = size;
1545         type->array.size_constant = true;
1546
1547         return identify_new_type(type);
1548 }
1549
1550 /**
1551  * Debug helper. Prints the given type to stdout.
1552  */
1553 static __attribute__((unused))
1554 void dbg_type(const type_t *type)
1555 {
1556         FILE *old_out = out;
1557         out = stderr;
1558         print_type(type);
1559         puts("\n");
1560         fflush(stderr);
1561         out = old_out;
1562 }