nsz Git - cparser/blob - type.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 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 "types.h"
  27 #include "entity_t.h"
  28 #include "symbol_t.h"
  29 #include "type_hash.h"
  30 #include "adt/error.h"
  31 #include "adt/util.h"
  32 #include "lang_features.h"
  33 #include "warning.h"
  34 #include "diagnostic.h"
  35 #include "printer.h"
  36
  37 /** The default calling convention. */
  38 cc_kind_t default_calling_convention = CC_CDECL;
  39
  40 static struct obstack type_obst;
  41 static bool           print_implicit_array_size = false;
  42
  43 static void intern_print_type_pre(const type_t *type);
  44 static void intern_print_type_post(const type_t *type);
  45
  46 /**
  47  * Returns the size of a type node.
  48  *
  49  * @param kind  the type kind
  50  */
  51 static size_t get_type_struct_size(type_kind_t kind)
  52 {
  53         static const size_t sizes[] = {
  54                 [TYPE_ATOMIC]          = sizeof(atomic_type_t),
  55                 [TYPE_COMPLEX]         = sizeof(complex_type_t),
  56                 [TYPE_IMAGINARY]       = sizeof(imaginary_type_t),
  57                 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
  58                 [TYPE_COMPOUND_UNION]  = sizeof(compound_type_t),
  59                 [TYPE_ENUM]            = sizeof(enum_type_t),
  60                 [TYPE_FUNCTION]        = sizeof(function_type_t),
  61                 [TYPE_POINTER]         = sizeof(pointer_type_t),
  62                 [TYPE_REFERENCE]       = sizeof(reference_type_t),
  63                 [TYPE_ARRAY]           = sizeof(array_type_t),
  64                 [TYPE_TYPEDEF]         = sizeof(typedef_type_t),
  65                 [TYPE_TYPEOF]          = sizeof(typeof_type_t),
  66         };
  67         assert(lengthof(sizes) == (int)TYPE_TYPEOF + 1);
  68         assert(kind <= TYPE_TYPEOF);
  69         assert(sizes[kind] != 0);
  70         return sizes[kind];
  71 }
  72
  73 type_t *allocate_type_zero(type_kind_t kind)
  74 {
  75         size_t  const size = get_type_struct_size(kind);
  76         type_t *const res  = obstack_alloc(&type_obst, size);
  77         memset(res, 0, size);
  78         res->base.kind = kind;
  79
  80         return res;
  81 }
  82
  83 /**
  84  * Properties of atomic types.
  85  */
  86 atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
  87         [ATOMIC_TYPE_VOID] = {
  88                 .size      = 0,
  89                 .alignment = 0,
  90                 .flags     = ATOMIC_TYPE_FLAG_NONE
  91         },
  92         [ATOMIC_TYPE_WCHAR_T] = {
  93                 .size      = (unsigned)-1,
  94                 .alignment = (unsigned)-1,
  95                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  96         },
  97         [ATOMIC_TYPE_CHAR] = {
  98                 .size      = 1,
  99                 .alignment = 1,
 100                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 101         },
 102         [ATOMIC_TYPE_SCHAR] = {
 103                 .size      = 1,
 104                 .alignment = 1,
 105                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 106                            | ATOMIC_TYPE_FLAG_SIGNED,
 107         },
 108         [ATOMIC_TYPE_UCHAR] = {
 109                 .size      = 1,
 110                 .alignment = 1,
 111                 .flags     = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 112         },
 113         [ATOMIC_TYPE_SHORT] = {
 114                 .size       = 2,
 115                 .alignment  = 2,
 116                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 117                               | ATOMIC_TYPE_FLAG_SIGNED
 118         },
 119         [ATOMIC_TYPE_USHORT] = {
 120                 .size       = 2,
 121                 .alignment  = 2,
 122                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 123         },
 124         [ATOMIC_TYPE_INT] = {
 125                 .size       = (unsigned) -1,
 126                 .alignment  = (unsigned) -1,
 127                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 128                               | ATOMIC_TYPE_FLAG_SIGNED,
 129         },
 130         [ATOMIC_TYPE_UINT] = {
 131                 .size       = (unsigned) -1,
 132                 .alignment  = (unsigned) -1,
 133                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 134         },
 135         [ATOMIC_TYPE_LONG] = {
 136                 .size       = (unsigned) -1,
 137                 .alignment  = (unsigned) -1,
 138                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 139                               | ATOMIC_TYPE_FLAG_SIGNED,
 140         },
 141         [ATOMIC_TYPE_ULONG] = {
 142                 .size       = (unsigned) -1,
 143                 .alignment  = (unsigned) -1,
 144                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 145         },
 146         [ATOMIC_TYPE_BOOL] = {
 147                 .size       = 1,
 148                 .alignment  = 1,
 149                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 150         },
 151         [ATOMIC_TYPE_FLOAT] = {
 152                 .size       = 4,
 153                 .alignment  = 4,
 154                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 155                               | ATOMIC_TYPE_FLAG_SIGNED,
 156         },
 157         [ATOMIC_TYPE_DOUBLE] = {
 158                 .size       = 8,
 159                 .alignment  = 8,
 160                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 161                               | ATOMIC_TYPE_FLAG_SIGNED,
 162         },
 163 };
 164 atomic_type_properties_t pointer_properties = {
 165         .size      = 4,
 166         .alignment = 4,
 167         .flags     = ATOMIC_TYPE_FLAG_NONE,
 168 };
 169
 170 static inline bool is_po2(unsigned x)
 171 {
 172         return (x & (x-1)) == 0;
 173 }
 174
 175 void init_types(unsigned machine_size)
 176 {
 177         obstack_init(&type_obst);
 178
 179         atomic_type_properties_t *props = atomic_type_properties;
 180
 181         /* atempt to set some sane defaults based on machine size */
 182
 183         unsigned int_size   = machine_size < 32 ? 2 : 4;
 184         unsigned long_size  = machine_size < 64 ? 4 : 8;
 185
 186         props[ATOMIC_TYPE_INT].size        = int_size;
 187         props[ATOMIC_TYPE_INT].alignment   = int_size;
 188         props[ATOMIC_TYPE_UINT].size       = int_size;
 189         props[ATOMIC_TYPE_UINT].alignment  = int_size;
 190         props[ATOMIC_TYPE_LONG].size       = long_size;
 191         props[ATOMIC_TYPE_LONG].alignment  = long_size;
 192         props[ATOMIC_TYPE_ULONG].size      = long_size;
 193         props[ATOMIC_TYPE_ULONG].alignment = long_size;
 194
 195         pointer_properties.size             = long_size;
 196         pointer_properties.alignment        = long_size;
 197         pointer_properties.struct_alignment = long_size;
 198
 199         props[ATOMIC_TYPE_LONGLONG]    = props[ATOMIC_TYPE_LONG];
 200         props[ATOMIC_TYPE_ULONGLONG]   = props[ATOMIC_TYPE_ULONG];
 201         props[ATOMIC_TYPE_LONG_DOUBLE] = props[ATOMIC_TYPE_DOUBLE];
 202         props[ATOMIC_TYPE_WCHAR_T]     = props[ATOMIC_TYPE_INT];
 203
 204         /* set struct alignments to the same value as alignment */
 205         for (size_t i = 0;
 206              i < sizeof(atomic_type_properties)/sizeof(atomic_type_properties[0]);
 207              ++i) {
 208                 props[i].struct_alignment = props[i].alignment;
 209         }
 210 }
 211
 212 void exit_types(void)
 213 {
 214         obstack_free(&type_obst, NULL);
 215 }
 216
 217 void print_type_qualifiers(type_qualifiers_t const qualifiers, QualifierSeparators const q)
 218 {
 219         size_t sep = q & QUAL_SEP_START ? 0 : 1;
 220         if (qualifiers & TYPE_QUALIFIER_CONST) {
 221                 print_string(" const" + sep);
 222                 sep = 0;
 223         }
 224         if (qualifiers & TYPE_QUALIFIER_VOLATILE) {
 225                 print_string(" volatile" + sep);
 226                 sep = 0;
 227         }
 228         if (qualifiers & TYPE_QUALIFIER_RESTRICT) {
 229                 print_string(" restrict" + sep);
 230                 sep = 0;
 231         }
 232         if (sep == 0 && q & QUAL_SEP_END)
 233                 print_char(' ');
 234 }
 235
 236 const char *get_atomic_kind_name(atomic_type_kind_t kind)
 237 {
 238         switch(kind) {
 239         case ATOMIC_TYPE_INVALID: break;
 240         case ATOMIC_TYPE_VOID:        return "void";
 241         case ATOMIC_TYPE_WCHAR_T:     return "wchar_t";
 242         case ATOMIC_TYPE_BOOL:        return c_mode & _CXX ? "bool" : "_Bool";
 243         case ATOMIC_TYPE_CHAR:        return "char";
 244         case ATOMIC_TYPE_SCHAR:       return "signed char";
 245         case ATOMIC_TYPE_UCHAR:       return "unsigned char";
 246         case ATOMIC_TYPE_INT:         return "int";
 247         case ATOMIC_TYPE_UINT:        return "unsigned int";
 248         case ATOMIC_TYPE_SHORT:       return "short";
 249         case ATOMIC_TYPE_USHORT:      return "unsigned short";
 250         case ATOMIC_TYPE_LONG:        return "long";
 251         case ATOMIC_TYPE_ULONG:       return "unsigned long";
 252         case ATOMIC_TYPE_LONGLONG:    return "long long";
 253         case ATOMIC_TYPE_ULONGLONG:   return "unsigned long long";
 254         case ATOMIC_TYPE_LONG_DOUBLE: return "long double";
 255         case ATOMIC_TYPE_FLOAT:       return "float";
 256         case ATOMIC_TYPE_DOUBLE:      return "double";
 257         }
 258         return "INVALIDATOMIC";
 259 }
 260
 261 /**
 262  * Prints the name of an atomic type kinds.
 263  *
 264  * @param kind  The type kind.
 265  */
 266 static void print_atomic_kinds(atomic_type_kind_t kind)
 267 {
 268         const char *s = get_atomic_kind_name(kind);
 269         print_string(s);
 270 }
 271
 272 /**
 273  * Prints the name of an atomic type.
 274  *
 275  * @param type  The type.
 276  */
 277 static void print_atomic_type(const atomic_type_t *type)
 278 {
 279         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 280         print_atomic_kinds(type->akind);
 281 }
 282
 283 /**
 284  * Prints the name of a complex type.
 285  *
 286  * @param type  The type.
 287  */
 288 static void print_complex_type(const complex_type_t *type)
 289 {
 290         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 291         print_string("_Complex");
 292         print_atomic_kinds(type->akind);
 293 }
 294
 295 /**
 296  * Prints the name of an imaginary type.
 297  *
 298  * @param type  The type.
 299  */
 300 static void print_imaginary_type(const imaginary_type_t *type)
 301 {
 302         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 303         print_string("_Imaginary ");
 304         print_atomic_kinds(type->akind);
 305 }
 306
 307 /**
 308  * Print the first part (the prefix) of a type.
 309  *
 310  * @param type   The type to print.
 311  */
 312 static void print_function_type_pre(const function_type_t *type)
 313 {
 314         switch (type->linkage) {
 315                 case LINKAGE_C:
 316                         if (c_mode & _CXX)
 317                                 print_string("extern \"C\" ");
 318                         break;
 319
 320                 case LINKAGE_CXX:
 321                         if (!(c_mode & _CXX))
 322                                 print_string("extern \"C++\" ");
 323                         break;
 324         }
 325
 326         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 327
 328         intern_print_type_pre(type->return_type);
 329
 330         cc_kind_t cc = type->calling_convention;
 331 restart:
 332         switch (cc) {
 333         case CC_CDECL:    print_string(" __cdecl");    break;
 334         case CC_STDCALL:  print_string(" __stdcall");  break;
 335         case CC_FASTCALL: print_string(" __fastcall"); break;
 336         case CC_THISCALL: print_string(" __thiscall"); break;
 337         case CC_DEFAULT:
 338                 if (default_calling_convention != CC_CDECL) {
 339                         /* show the default calling convention if its not cdecl */
 340                         cc = default_calling_convention;
 341                         goto restart;
 342                 }
 343                 break;
 344         }
 345 }
 346
 347 /**
 348  * Print the second part (the postfix) of a type.
 349  *
 350  * @param type   The type to print.
 351  */
 352 static void print_function_type_post(const function_type_t *type,
 353                                      const scope_t *parameters)
 354 {
 355         print_string("(");
 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                                 print_string(", ");
 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                                 print_string(", ");
 377                         }
 378                         const type_t *const param_type = parameter->declaration.type;
 379                         if (param_type == NULL) {
 380                                 print_string(parameter->base.symbol->string);
 381                         } else {
 382                                 print_type_ext(param_type, parameter->base.symbol, NULL);
 383                         }
 384                 }
 385         }
 386         if (type->variadic) {
 387                 if (first) {
 388                         first = false;
 389                 } else {
 390                         print_string(", ");
 391                 }
 392                 print_string("...");
 393         }
 394         if (first && !type->unspecified_parameters) {
 395                 print_string("void");
 396         }
 397         print_string(")");
 398
 399         intern_print_type_post(type->return_type);
 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         type_t const *const points_to = type->points_to;
 410         intern_print_type_pre(points_to);
 411         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 412                 print_string(" (");
 413         variable_t *const variable = type->base_variable;
 414         if (variable != NULL) {
 415                 print_string(" __based(");
 416                 print_string(variable->base.base.symbol->string);
 417                 print_string(") ");
 418         }
 419         print_string("*");
 420         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_START);
 421 }
 422
 423 /**
 424  * Prints the postfix part of a pointer type.
 425  *
 426  * @param type   The pointer type.
 427  */
 428 static void print_pointer_type_post(const pointer_type_t *type)
 429 {
 430         type_t const *const points_to = type->points_to;
 431         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 432                 print_string(")");
 433         intern_print_type_post(points_to);
 434 }
 435
 436 /**
 437  * Prints the prefix part of a reference type.
 438  *
 439  * @param type   The reference type.
 440  */
 441 static void print_reference_type_pre(const reference_type_t *type)
 442 {
 443         type_t const *const refers_to = type->refers_to;
 444         intern_print_type_pre(refers_to);
 445         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 446                 print_string(" (");
 447         print_string("&");
 448 }
 449
 450 /**
 451  * Prints the postfix part of a reference type.
 452  *
 453  * @param type   The reference type.
 454  */
 455 static void print_reference_type_post(const reference_type_t *type)
 456 {
 457         type_t const *const refers_to = type->refers_to;
 458         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 459                 print_string(")");
 460         intern_print_type_post(refers_to);
 461 }
 462
 463 /**
 464  * Prints the prefix part of an array type.
 465  *
 466  * @param type   The array type.
 467  */
 468 static void print_array_type_pre(const array_type_t *type)
 469 {
 470         intern_print_type_pre(type->element_type);
 471 }
 472
 473 /**
 474  * Prints the postfix part of an array type.
 475  *
 476  * @param type   The array type.
 477  */
 478 static void print_array_type_post(const array_type_t *type)
 479 {
 480         print_string("[");
 481         if (type->is_static) {
 482                 print_string("static ");
 483         }
 484         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 485         if (type->size_expression != NULL
 486                         && (print_implicit_array_size || !type->has_implicit_size)) {
 487                 print_expression(type->size_expression);
 488         }
 489         print_string("]");
 490         intern_print_type_post(type->element_type);
 491 }
 492
 493 /**
 494  * Prints an enum definition.
 495  *
 496  * @param declaration  The enum's type declaration.
 497  */
 498 void print_enum_definition(const enum_t *enume)
 499 {
 500         print_string("{\n");
 501
 502         change_indent(1);
 503
 504         entity_t *entry = enume->base.next;
 505         for( ; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
 506                entry = entry->base.next) {
 507
 508                 print_indent();
 509                 print_string(entry->base.symbol->string);
 510                 if (entry->enum_value.value != NULL) {
 511                         print_string(" = ");
 512
 513                         /* skip the implicit cast */
 514                         expression_t *expression = entry->enum_value.value;
 515                         print_expression(expression);
 516                 }
 517                 print_string(",\n");
 518         }
 519
 520         change_indent(-1);
 521         print_indent();
 522         print_string("}");
 523 }
 524
 525 /**
 526  * Prints an enum type.
 527  *
 528  * @param type  The enum type.
 529  */
 530 static void print_type_enum(const enum_type_t *type)
 531 {
 532         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 533         print_string("enum ");
 534
 535         enum_t   *enume  = type->enume;
 536         symbol_t *symbol = enume->base.symbol;
 537         if (symbol != NULL) {
 538                 print_string(symbol->string);
 539         } else {
 540                 print_enum_definition(enume);
 541         }
 542 }
 543
 544 /**
 545  * Print the compound part of a compound type.
 546  */
 547 void print_compound_definition(const compound_t *compound)
 548 {
 549         print_string("{\n");
 550         change_indent(1);
 551
 552         entity_t *entity = compound->members.entities;
 553         for( ; entity != NULL; entity = entity->base.next) {
 554                 if (entity->kind != ENTITY_COMPOUND_MEMBER)
 555                         continue;
 556
 557                 print_indent();
 558                 print_entity(entity);
 559                 print_string("\n");
 560         }
 561
 562         change_indent(-1);
 563         print_indent();
 564         print_string("}");
 565         if (compound->modifiers & DM_TRANSPARENT_UNION) {
 566                 print_string("__attribute__((__transparent_union__))");
 567         }
 568 }
 569
 570 /**
 571  * Prints a compound type.
 572  *
 573  * @param type  The compound type.
 574  */
 575 static void print_compound_type(const compound_type_t *type)
 576 {
 577         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 578
 579         if (type->base.kind == TYPE_COMPOUND_STRUCT) {
 580                 print_string("struct ");
 581         } else {
 582                 assert(type->base.kind == TYPE_COMPOUND_UNION);
 583                 print_string("union ");
 584         }
 585
 586         compound_t *compound = type->compound;
 587         symbol_t   *symbol   = compound->base.symbol;
 588         if (symbol != NULL) {
 589                 print_string(symbol->string);
 590         } else {
 591                 print_compound_definition(compound);
 592         }
 593 }
 594
 595 /**
 596  * Prints the prefix part of a typedef type.
 597  *
 598  * @param type   The typedef type.
 599  */
 600 static void print_typedef_type_pre(const typedef_type_t *const type)
 601 {
 602         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 603         print_string(type->typedefe->base.symbol->string);
 604 }
 605
 606 /**
 607  * Prints the prefix part of a typeof type.
 608  *
 609  * @param type   The typeof type.
 610  */
 611 static void print_typeof_type_pre(const typeof_type_t *const type)
 612 {
 613         print_string("typeof(");
 614         if (type->expression != NULL) {
 615                 print_expression(type->expression);
 616         } else {
 617                 print_type(type->typeof_type);
 618         }
 619         print_string(")");
 620 }
 621
 622 /**
 623  * Prints the prefix part of a type.
 624  *
 625  * @param type   The type.
 626  */
 627 static void intern_print_type_pre(const type_t *const type)
 628 {
 629         switch(type->kind) {
 630         case TYPE_ERROR:
 631                 print_string("<error>");
 632                 return;
 633         case TYPE_ENUM:
 634                 print_type_enum(&type->enumt);
 635                 return;
 636         case TYPE_ATOMIC:
 637                 print_atomic_type(&type->atomic);
 638                 return;
 639         case TYPE_COMPLEX:
 640                 print_complex_type(&type->complex);
 641                 return;
 642         case TYPE_IMAGINARY:
 643                 print_imaginary_type(&type->imaginary);
 644                 return;
 645         case TYPE_COMPOUND_STRUCT:
 646         case TYPE_COMPOUND_UNION:
 647                 print_compound_type(&type->compound);
 648                 return;
 649         case TYPE_FUNCTION:
 650                 print_function_type_pre(&type->function);
 651                 return;
 652         case TYPE_POINTER:
 653                 print_pointer_type_pre(&type->pointer);
 654                 return;
 655         case TYPE_REFERENCE:
 656                 print_reference_type_pre(&type->reference);
 657                 return;
 658         case TYPE_ARRAY:
 659                 print_array_type_pre(&type->array);
 660                 return;
 661         case TYPE_TYPEDEF:
 662                 print_typedef_type_pre(&type->typedeft);
 663                 return;
 664         case TYPE_TYPEOF:
 665                 print_typeof_type_pre(&type->typeoft);
 666                 return;
 667         }
 668         print_string("unknown");
 669 }
 670
 671 /**
 672  * Prints the postfix part of a type.
 673  *
 674  * @param type   The type.
 675  */
 676 static void intern_print_type_post(const type_t *const type)
 677 {
 678         switch(type->kind) {
 679         case TYPE_FUNCTION:
 680                 print_function_type_post(&type->function, NULL);
 681                 return;
 682         case TYPE_POINTER:
 683                 print_pointer_type_post(&type->pointer);
 684                 return;
 685         case TYPE_REFERENCE:
 686                 print_reference_type_post(&type->reference);
 687                 return;
 688         case TYPE_ARRAY:
 689                 print_array_type_post(&type->array);
 690                 return;
 691         case TYPE_ERROR:
 692         case TYPE_ATOMIC:
 693         case TYPE_COMPLEX:
 694         case TYPE_IMAGINARY:
 695         case TYPE_ENUM:
 696         case TYPE_COMPOUND_STRUCT:
 697         case TYPE_COMPOUND_UNION:
 698         case TYPE_TYPEOF:
 699         case TYPE_TYPEDEF:
 700                 break;
 701         }
 702 }
 703
 704 /**
 705  * Prints a type.
 706  *
 707  * @param type   The type.
 708  */
 709 void print_type(const type_t *const type)
 710 {
 711         print_type_ext(type, NULL, NULL);
 712 }
 713
 714 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 715                     const scope_t *parameters)
 716 {
 717         intern_print_type_pre(type);
 718         if (symbol != NULL) {
 719                 print_string(" ");
 720                 print_string(symbol->string);
 721         }
 722         if (type->kind == TYPE_FUNCTION) {
 723                 print_function_type_post(&type->function, parameters);
 724         } else {
 725                 intern_print_type_post(type);
 726         }
 727 }
 728
 729 /**
 730  * Duplicates a type.
 731  *
 732  * @param type  The type to copy.
 733  * @return A copy of the type.
 734  *
 735  * @note This does not produce a deep copy!
 736  */
 737 type_t *duplicate_type(const type_t *type)
 738 {
 739         size_t size = get_type_struct_size(type->kind);
 740
 741         type_t *const copy = obstack_alloc(&type_obst, size);
 742         memcpy(copy, type, size);
 743         copy->base.firm_type = NULL;
 744
 745         return copy;
 746 }
 747
 748 /**
 749  * Returns the unqualified type of a given type.
 750  *
 751  * @param type  The type.
 752  * @returns The unqualified type.
 753  */
 754 type_t *get_unqualified_type(type_t *type)
 755 {
 756         assert(!is_typeref(type));
 757
 758         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 759                 return type;
 760
 761         type_t *unqualified_type          = duplicate_type(type);
 762         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 763
 764         return identify_new_type(unqualified_type);
 765 }
 766
 767 type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual)
 768 {
 769         type_t *type = skip_typeref(orig_type);
 770
 771         type_t *copy;
 772         if (is_type_array(type)) {
 773                 /* For array types the element type has to be adjusted */
 774                 type_t *element_type      = type->array.element_type;
 775                 type_t *qual_element_type = get_qualified_type(element_type, qual);
 776
 777                 if (qual_element_type == element_type)
 778                         return orig_type;
 779
 780                 copy                     = duplicate_type(type);
 781                 copy->array.element_type = qual_element_type;
 782         } else if (is_type_valid(type)) {
 783                 if ((type->base.qualifiers & qual) == (int)qual)
 784                         return orig_type;
 785
 786                 copy                   = duplicate_type(type);
 787                 copy->base.qualifiers |= qual;
 788         } else {
 789                 return type;
 790         }
 791
 792         return identify_new_type(copy);
 793 }
 794
 795 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 796                                   atomic_type_flag_t flag)
 797 {
 798         assert(kind <= ATOMIC_TYPE_LAST);
 799         return (atomic_type_properties[kind].flags & flag) != 0;
 800 }
 801
 802 /**
 803  * Returns true if the given type is an integer type.
 804  *
 805  * @param type  The type to check.
 806  * @return True if type is an integer type.
 807  */
 808 bool is_type_integer(const type_t *type)
 809 {
 810         assert(!is_typeref(type));
 811
 812         if (type->kind == TYPE_ENUM)
 813                 return true;
 814         if (type->kind != TYPE_ATOMIC)
 815                 return false;
 816
 817         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 818 }
 819
 820 /**
 821  * Returns true if the given type is an enum type.
 822  *
 823  * @param type  The type to check.
 824  * @return True if type is an enum type.
 825  */
 826 bool is_type_enum(const type_t *type)
 827 {
 828         assert(!is_typeref(type));
 829         return type->kind == TYPE_ENUM;
 830 }
 831
 832 /**
 833  * Returns true if the given type is an floating point type.
 834  *
 835  * @param type  The type to check.
 836  * @return True if type is a floating point type.
 837  */
 838 bool is_type_float(const type_t *type)
 839 {
 840         assert(!is_typeref(type));
 841
 842         if (type->kind != TYPE_ATOMIC)
 843                 return false;
 844
 845         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 846 }
 847
 848 /**
 849  * Returns true if the given type is an complex type.
 850  *
 851  * @param type  The type to check.
 852  * @return True if type is a complex type.
 853  */
 854 bool is_type_complex(const type_t *type)
 855 {
 856         assert(!is_typeref(type));
 857
 858         if (type->kind != TYPE_ATOMIC)
 859                 return false;
 860
 861         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_COMPLEX);
 862 }
 863
 864 /**
 865  * Returns true if the given type is a signed type.
 866  *
 867  * @param type  The type to check.
 868  * @return True if type is a signed type.
 869  */
 870 bool is_type_signed(const type_t *type)
 871 {
 872         assert(!is_typeref(type));
 873
 874         /* enum types are int for now */
 875         if (type->kind == TYPE_ENUM)
 876                 return true;
 877         if (type->kind != TYPE_ATOMIC)
 878                 return false;
 879
 880         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 881 }
 882
 883 /**
 884  * Returns true if the given type represents an arithmetic type.
 885  *
 886  * @param type  The type to check.
 887  * @return True if type represents an arithmetic type.
 888  */
 889 bool is_type_arithmetic(const type_t *type)
 890 {
 891         assert(!is_typeref(type));
 892
 893         switch(type->kind) {
 894         case TYPE_ENUM:
 895                 return true;
 896         case TYPE_ATOMIC:
 897                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 898         case TYPE_COMPLEX:
 899                 return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 900         case TYPE_IMAGINARY:
 901                 return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 902         default:
 903                 return false;
 904         }
 905 }
 906
 907 /**
 908  * Returns true if the given type is an integer or float type.
 909  *
 910  * @param type  The type to check.
 911  * @return True if type is an integer or float type.
 912  */
 913 bool is_type_real(const type_t *type)
 914 {
 915         /* 6.2.5 (17) */
 916         return is_type_integer(type) || is_type_float(type);
 917 }
 918
 919 /**
 920  * Returns true if the given type represents a scalar type.
 921  *
 922  * @param type  The type to check.
 923  * @return True if type represents a scalar type.
 924  */
 925 bool is_type_scalar(const type_t *type)
 926 {
 927         assert(!is_typeref(type));
 928
 929         if (type->kind == TYPE_POINTER)
 930                 return true;
 931
 932         return is_type_arithmetic(type);
 933 }
 934
 935 /**
 936  * Check if a given type is incomplete.
 937  *
 938  * @param type  The type to check.
 939  * @return True if the given type is incomplete (ie. just forward).
 940  */
 941 bool is_type_incomplete(const type_t *type)
 942 {
 943         assert(!is_typeref(type));
 944
 945         switch(type->kind) {
 946         case TYPE_COMPOUND_STRUCT:
 947         case TYPE_COMPOUND_UNION: {
 948                 const compound_type_t *compound_type = &type->compound;
 949                 return !compound_type->compound->complete;
 950         }
 951         case TYPE_ENUM:
 952                 return false;
 953
 954         case TYPE_ARRAY:
 955                 return type->array.size_expression == NULL
 956                         && !type->array.size_constant;
 957
 958         case TYPE_ATOMIC:
 959                 return type->atomic.akind == ATOMIC_TYPE_VOID;
 960
 961         case TYPE_COMPLEX:
 962                 return type->complex.akind == ATOMIC_TYPE_VOID;
 963
 964         case TYPE_IMAGINARY:
 965                 return type->imaginary.akind == ATOMIC_TYPE_VOID;
 966
 967         case TYPE_FUNCTION:
 968         case TYPE_POINTER:
 969         case TYPE_REFERENCE:
 970         case TYPE_ERROR:
 971                 return false;
 972
 973         case TYPE_TYPEDEF:
 974         case TYPE_TYPEOF:
 975                 panic("is_type_incomplete called without typerefs skipped");
 976         }
 977
 978         panic("invalid type found");
 979 }
 980
 981 bool is_type_object(const type_t *type)
 982 {
 983         return !is_type_function(type) && !is_type_incomplete(type);
 984 }
 985
 986 /**
 987  * Check if two function types are compatible.
 988  */
 989 static bool function_types_compatible(const function_type_t *func1,
 990                                       const function_type_t *func2)
 991 {
 992         const type_t* const ret1 = skip_typeref(func1->return_type);
 993         const type_t* const ret2 = skip_typeref(func2->return_type);
 994         if (!types_compatible(ret1, ret2))
 995                 return false;
 996
 997         if (func1->linkage != func2->linkage)
 998                 return false;
 999
1000         cc_kind_t cc1 = func1->calling_convention;
1001         if (cc1 == CC_DEFAULT)
1002                 cc1 = default_calling_convention;
1003         cc_kind_t cc2 = func2->calling_convention;
1004         if (cc2 == CC_DEFAULT)
1005                 cc2 = default_calling_convention;
1006
1007         if (cc1 != cc2)
1008                 return false;
1009
1010         if (func1->variadic != func2->variadic)
1011                 return false;
1012
1013         /* can parameters be compared? */
1014         if ((func1->unspecified_parameters && !func1->kr_style_parameters)
1015                         || (func2->unspecified_parameters && !func2->kr_style_parameters))
1016                 return true;
1017
1018         /* TODO: handling of unspecified parameters not correct yet */
1019
1020         /* all argument types must be compatible */
1021         function_parameter_t *parameter1 = func1->parameters;
1022         function_parameter_t *parameter2 = func2->parameters;
1023         for ( ; parameter1 != NULL && parameter2 != NULL;
1024                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
1025                 type_t *parameter1_type = skip_typeref(parameter1->type);
1026                 type_t *parameter2_type = skip_typeref(parameter2->type);
1027
1028                 parameter1_type = get_unqualified_type(parameter1_type);
1029                 parameter2_type = get_unqualified_type(parameter2_type);
1030
1031                 if (!types_compatible(parameter1_type, parameter2_type))
1032                         return false;
1033         }
1034         /* same number of arguments? */
1035         if (parameter1 != NULL || parameter2 != NULL)
1036                 return false;
1037
1038         return true;
1039 }
1040
1041 /**
1042  * Check if two array types are compatible.
1043  */
1044 static bool array_types_compatible(const array_type_t *array1,
1045                                    const array_type_t *array2)
1046 {
1047         type_t *element_type1 = skip_typeref(array1->element_type);
1048         type_t *element_type2 = skip_typeref(array2->element_type);
1049         if (!types_compatible(element_type1, element_type2))
1050                 return false;
1051
1052         if (!array1->size_constant || !array2->size_constant)
1053                 return true;
1054
1055         return array1->size == array2->size;
1056 }
1057
1058 /**
1059  * Check if two types are compatible.
1060  */
1061 bool types_compatible(const type_t *type1, const type_t *type2)
1062 {
1063         assert(!is_typeref(type1));
1064         assert(!is_typeref(type2));
1065
1066         /* shortcut: the same type is always compatible */
1067         if (type1 == type2)
1068                 return true;
1069
1070         if (!is_type_valid(type1) || !is_type_valid(type2))
1071                 return true;
1072
1073         if (type1->base.qualifiers != type2->base.qualifiers)
1074                 return false;
1075         if (type1->kind != type2->kind)
1076                 return false;
1077
1078         switch (type1->kind) {
1079         case TYPE_FUNCTION:
1080                 return function_types_compatible(&type1->function, &type2->function);
1081         case TYPE_ATOMIC:
1082                 return type1->atomic.akind == type2->atomic.akind;
1083         case TYPE_COMPLEX:
1084                 return type1->complex.akind == type2->complex.akind;
1085         case TYPE_IMAGINARY:
1086                 return type1->imaginary.akind == type2->imaginary.akind;
1087         case TYPE_ARRAY:
1088                 return array_types_compatible(&type1->array, &type2->array);
1089
1090         case TYPE_POINTER: {
1091                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
1092                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
1093                 return types_compatible(to1, to2);
1094         }
1095
1096         case TYPE_REFERENCE: {
1097                 const type_t *const to1 = skip_typeref(type1->reference.refers_to);
1098                 const type_t *const to2 = skip_typeref(type2->reference.refers_to);
1099                 return types_compatible(to1, to2);
1100         }
1101
1102         case TYPE_COMPOUND_STRUCT:
1103         case TYPE_COMPOUND_UNION: {
1104                 break;
1105         }
1106         case TYPE_ENUM:
1107                 /* TODO: not implemented */
1108                 break;
1109
1110         case TYPE_ERROR:
1111                 /* Hmm, the error type should be compatible to all other types */
1112                 return true;
1113         case TYPE_TYPEDEF:
1114         case TYPE_TYPEOF:
1115                 panic("typerefs not skipped in compatible types?!?");
1116         }
1117
1118         return false;
1119 }
1120
1121 /**
1122  * Skip all typerefs and return the underlying type.
1123  */
1124 type_t *skip_typeref(type_t *type)
1125 {
1126         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1127
1128         while (true) {
1129                 switch (type->kind) {
1130                 case TYPE_ERROR:
1131                         return type;
1132                 case TYPE_TYPEDEF: {
1133                         qualifiers |= type->base.qualifiers;
1134
1135                         const typedef_type_t *typedef_type = &type->typedeft;
1136                         if (typedef_type->resolved_type != NULL) {
1137                                 type = typedef_type->resolved_type;
1138                                 break;
1139                         }
1140                         type = typedef_type->typedefe->type;
1141                         continue;
1142                 }
1143                 case TYPE_TYPEOF:
1144                         qualifiers |= type->base.qualifiers;
1145                         type        = type->typeoft.typeof_type;
1146                         continue;
1147                 default:
1148                         break;
1149                 }
1150                 break;
1151         }
1152
1153         if (qualifiers != TYPE_QUALIFIER_NONE) {
1154                 type_t *const copy = duplicate_type(type);
1155
1156                 /* for const with typedefed array type the element type has to be
1157                  * adjusted */
1158                 if (is_type_array(copy)) {
1159                         type_t *element_type           = copy->array.element_type;
1160                         element_type                   = duplicate_type(element_type);
1161                         element_type->base.qualifiers |= qualifiers;
1162                         copy->array.element_type       = element_type;
1163                 } else {
1164                         copy->base.qualifiers |= qualifiers;
1165                 }
1166
1167                 type = identify_new_type(copy);
1168         }
1169
1170         return type;
1171 }
1172
1173 unsigned get_type_size(type_t *type)
1174 {
1175         switch (type->kind) {
1176         case TYPE_ERROR:
1177                 return 0;
1178         case TYPE_ATOMIC:
1179                 return get_atomic_type_size(type->atomic.akind);
1180         case TYPE_COMPLEX:
1181                 return get_atomic_type_size(type->complex.akind) * 2;
1182         case TYPE_IMAGINARY:
1183                 return get_atomic_type_size(type->imaginary.akind);
1184         case TYPE_COMPOUND_UNION:
1185                 layout_union_type(&type->compound);
1186                 return type->compound.compound->size;
1187         case TYPE_COMPOUND_STRUCT:
1188                 layout_struct_type(&type->compound);
1189                 return type->compound.compound->size;
1190         case TYPE_ENUM:
1191                 return get_atomic_type_size(type->enumt.akind);
1192         case TYPE_FUNCTION:
1193                 return 0; /* non-const (but "address-const") */
1194         case TYPE_REFERENCE:
1195         case TYPE_POINTER:
1196                 return pointer_properties.size;
1197         case TYPE_ARRAY: {
1198                 /* TODO: correct if element_type is aligned? */
1199                 il_size_t element_size = get_type_size(type->array.element_type);
1200                 return type->array.size * element_size;
1201         }
1202         case TYPE_TYPEDEF:
1203                 return get_type_size(type->typedeft.typedefe->type);
1204         case TYPE_TYPEOF:
1205                 if (type->typeoft.typeof_type) {
1206                         return get_type_size(type->typeoft.typeof_type);
1207                 } else {
1208                         return get_type_size(type->typeoft.expression->base.type);
1209                 }
1210         }
1211         panic("invalid type in get_type_size");
1212 }
1213
1214 unsigned get_type_alignment(type_t *type)
1215 {
1216         switch (type->kind) {
1217         case TYPE_ERROR:
1218                 return 0;
1219         case TYPE_ATOMIC:
1220                 return get_atomic_type_alignment(type->atomic.akind);
1221         case TYPE_COMPLEX:
1222                 return get_atomic_type_alignment(type->complex.akind);
1223         case TYPE_IMAGINARY:
1224                 return get_atomic_type_alignment(type->imaginary.akind);
1225         case TYPE_COMPOUND_UNION:
1226                 layout_union_type(&type->compound);
1227                 return type->compound.compound->alignment;
1228         case TYPE_COMPOUND_STRUCT:
1229                 layout_struct_type(&type->compound);
1230                 return type->compound.compound->alignment;
1231         case TYPE_ENUM:
1232                 return get_atomic_type_alignment(type->enumt.akind);
1233         case TYPE_FUNCTION:
1234                 /* gcc says 1 here... */
1235                 return 1;
1236         case TYPE_REFERENCE:
1237         case TYPE_POINTER:
1238                 return pointer_properties.alignment;
1239         case TYPE_ARRAY:
1240                 return get_type_alignment(type->array.element_type);
1241         case TYPE_TYPEDEF: {
1242                 il_alignment_t alignment
1243                         = get_type_alignment(type->typedeft.typedefe->type);
1244                 if (type->typedeft.typedefe->alignment > alignment)
1245                         alignment = type->typedeft.typedefe->alignment;
1246
1247                 return alignment;
1248         }
1249         case TYPE_TYPEOF:
1250                 if (type->typeoft.typeof_type) {
1251                         return get_type_alignment(type->typeoft.typeof_type);
1252                 } else {
1253                         return get_type_alignment(type->typeoft.expression->base.type);
1254                 }
1255         }
1256         panic("invalid type in get_type_alignment");
1257 }
1258
1259 unsigned get_type_alignment_compound(type_t *type)
1260 {
1261         if (type->kind == TYPE_ATOMIC)
1262                 return atomic_type_properties[type->atomic.akind].struct_alignment;
1263         return get_type_alignment(type);
1264 }
1265
1266 decl_modifiers_t get_type_modifiers(const type_t *type)
1267 {
1268         switch(type->kind) {
1269         case TYPE_ERROR:
1270                 break;
1271         case TYPE_COMPOUND_STRUCT:
1272         case TYPE_COMPOUND_UNION:
1273                 return type->compound.compound->modifiers;
1274         case TYPE_FUNCTION:
1275                 return type->function.modifiers;
1276         case TYPE_ENUM:
1277         case TYPE_ATOMIC:
1278         case TYPE_COMPLEX:
1279         case TYPE_IMAGINARY:
1280         case TYPE_REFERENCE:
1281         case TYPE_POINTER:
1282         case TYPE_ARRAY:
1283                 return 0;
1284         case TYPE_TYPEDEF: {
1285                 decl_modifiers_t modifiers = type->typedeft.typedefe->modifiers;
1286                 modifiers |= get_type_modifiers(type->typedeft.typedefe->type);
1287                 return modifiers;
1288         }
1289         case TYPE_TYPEOF:
1290                 if (type->typeoft.typeof_type) {
1291                         return get_type_modifiers(type->typeoft.typeof_type);
1292                 } else {
1293                         return get_type_modifiers(type->typeoft.expression->base.type);
1294                 }
1295         }
1296         panic("invalid type found in get_type_modifiers");
1297 }
1298
1299 type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type)
1300 {
1301         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1302
1303         while (true) {
1304                 switch (type->base.kind) {
1305                 case TYPE_ERROR:
1306                         return TYPE_QUALIFIER_NONE;
1307                 case TYPE_TYPEDEF:
1308                         qualifiers |= type->base.qualifiers;
1309                         const typedef_type_t *typedef_type = &type->typedeft;
1310                         if (typedef_type->resolved_type != NULL)
1311                                 type = typedef_type->resolved_type;
1312                         else
1313                                 type = typedef_type->typedefe->type;
1314                         continue;
1315                 case TYPE_TYPEOF:
1316                         type = type->typeoft.typeof_type;
1317                         continue;
1318                 case TYPE_ARRAY:
1319                         if (skip_array_type) {
1320                                 type = type->array.element_type;
1321                                 continue;
1322                         }
1323                         break;
1324                 default:
1325                         break;
1326                 }
1327                 break;
1328         }
1329         return type->base.qualifiers | qualifiers;
1330 }
1331
1332 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1333 {
1334         assert(kind <= ATOMIC_TYPE_LAST);
1335         return atomic_type_properties[kind].size;
1336 }
1337
1338 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1339 {
1340         assert(kind <= ATOMIC_TYPE_LAST);
1341         return atomic_type_properties[kind].alignment;
1342 }
1343
1344 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1345 {
1346         assert(kind <= ATOMIC_TYPE_LAST);
1347         return atomic_type_properties[kind].flags;
1348 }
1349
1350 /**
1351  * Find the atomic type kind representing a given size (signed).
1352  */
1353 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size)
1354 {
1355         static atomic_type_kind_t kinds[32];
1356
1357         assert(size < 32);
1358         atomic_type_kind_t kind = kinds[size];
1359         if (kind == ATOMIC_TYPE_INVALID) {
1360                 static const atomic_type_kind_t possible_kinds[] = {
1361                         ATOMIC_TYPE_SCHAR,
1362                         ATOMIC_TYPE_SHORT,
1363                         ATOMIC_TYPE_INT,
1364                         ATOMIC_TYPE_LONG,
1365                         ATOMIC_TYPE_LONGLONG
1366                 };
1367                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1368                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1369                                 kind = possible_kinds[i];
1370                                 break;
1371                         }
1372                 }
1373                 kinds[size] = kind;
1374         }
1375         return kind;
1376 }
1377
1378 /**
1379  * Find the atomic type kind representing a given size (signed).
1380  */
1381 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size)
1382 {
1383         static atomic_type_kind_t kinds[32];
1384
1385         assert(size < 32);
1386         atomic_type_kind_t kind = kinds[size];
1387         if (kind == ATOMIC_TYPE_INVALID) {
1388                 static const atomic_type_kind_t possible_kinds[] = {
1389                         ATOMIC_TYPE_UCHAR,
1390                         ATOMIC_TYPE_USHORT,
1391                         ATOMIC_TYPE_UINT,
1392                         ATOMIC_TYPE_ULONG,
1393                         ATOMIC_TYPE_ULONGLONG
1394                 };
1395                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1396                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1397                                 kind = possible_kinds[i];
1398                                 break;
1399                         }
1400                 }
1401                 kinds[size] = kind;
1402         }
1403         return kind;
1404 }
1405
1406 /**
1407  * Hash the given type and return the "singleton" version
1408  * of it.
1409  */
1410 type_t *identify_new_type(type_t *type)
1411 {
1412         type_t *result = typehash_insert(type);
1413         if (result != type) {
1414                 obstack_free(&type_obst, type);
1415         }
1416         return result;
1417 }
1418
1419 /**
1420  * Creates a new atomic type.
1421  *
1422  * @param akind       The kind of the atomic type.
1423  * @param qualifiers  Type qualifiers for the new type.
1424  */
1425 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1426 {
1427         type_t *const type = allocate_type_zero(TYPE_ATOMIC);
1428         type->base.qualifiers = qualifiers;
1429         type->atomic.akind    = akind;
1430
1431         return identify_new_type(type);
1432 }
1433
1434 /**
1435  * Creates a new complex type.
1436  *
1437  * @param akind       The kind of the atomic type.
1438  * @param qualifiers  Type qualifiers for the new type.
1439  */
1440 type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1441 {
1442         type_t *const type = allocate_type_zero(TYPE_COMPLEX);
1443         type->base.qualifiers = qualifiers;
1444         type->complex.akind   = akind;
1445
1446         return identify_new_type(type);
1447 }
1448
1449 /**
1450  * Creates a new imaginary type.
1451  *
1452  * @param akind       The kind of the atomic type.
1453  * @param qualifiers  Type qualifiers for the new type.
1454  */
1455 type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1456 {
1457         type_t *const type = allocate_type_zero(TYPE_IMAGINARY);
1458         type->base.qualifiers = qualifiers;
1459         type->imaginary.akind = akind;
1460
1461         return identify_new_type(type);
1462 }
1463
1464 /**
1465  * Creates a new pointer type.
1466  *
1467  * @param points_to   The points-to type for the new type.
1468  * @param qualifiers  Type qualifiers for the new type.
1469  */
1470 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1471 {
1472         type_t *const type = allocate_type_zero(TYPE_POINTER);
1473         type->base.qualifiers       = qualifiers;
1474         type->pointer.points_to     = points_to;
1475         type->pointer.base_variable = NULL;
1476
1477         return identify_new_type(type);
1478 }
1479
1480 /**
1481  * Creates a new reference type.
1482  *
1483  * @param refers_to   The referred-to type for the new type.
1484  */
1485 type_t *make_reference_type(type_t *refers_to)
1486 {
1487         type_t *const type = allocate_type_zero(TYPE_REFERENCE);
1488         type->base.qualifiers     = TYPE_QUALIFIER_NONE;
1489         type->reference.refers_to = refers_to;
1490
1491         return identify_new_type(type);
1492 }
1493
1494 /**
1495  * Creates a new based pointer type.
1496  *
1497  * @param points_to   The points-to type for the new type.
1498  * @param qualifiers  Type qualifiers for the new type.
1499  * @param variable    The based variable
1500  */
1501 type_t *make_based_pointer_type(type_t *points_to,
1502                                                                 type_qualifiers_t qualifiers, variable_t *variable)
1503 {
1504         type_t *const type = allocate_type_zero(TYPE_POINTER);
1505         type->base.qualifiers       = qualifiers;
1506         type->pointer.points_to     = points_to;
1507         type->pointer.base_variable = variable;
1508
1509         return identify_new_type(type);
1510 }
1511
1512
1513 type_t *make_array_type(type_t *element_type, size_t size,
1514                         type_qualifiers_t qualifiers)
1515 {
1516         type_t *const type = allocate_type_zero(TYPE_ARRAY);
1517         type->base.qualifiers     = qualifiers;
1518         type->array.element_type  = element_type;
1519         type->array.size          = size;
1520         type->array.size_constant = true;
1521
1522         return identify_new_type(type);
1523 }
1524
1525 static entity_t *pack_bitfield_members(il_size_t *struct_offset,
1526                                        il_alignment_t *struct_alignment,
1527                                                                            bool packed, entity_t *first)
1528 {
1529         il_size_t      offset     = *struct_offset;
1530         il_alignment_t alignment  = *struct_alignment;
1531         size_t         bit_offset = 0;
1532
1533         entity_t *member;
1534         for (member = first; member != NULL; member = member->base.next) {
1535                 if (member->kind != ENTITY_COMPOUND_MEMBER)
1536                         continue;
1537                 if (!member->compound_member.bitfield)
1538                         break;
1539
1540                 type_t *base_type = member->declaration.type;
1541                 il_alignment_t base_alignment = get_type_alignment_compound(base_type);
1542                 il_alignment_t alignment_mask = base_alignment-1;
1543                 if (base_alignment > alignment)
1544                         alignment = base_alignment;
1545
1546                 size_t bit_size = member->compound_member.bit_size;
1547                 if (!packed) {
1548                         bit_offset += (offset & alignment_mask) * BITS_PER_BYTE;
1549                         offset     &= ~alignment_mask;
1550                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1551
1552                         if (bit_offset + bit_size > base_size || bit_size == 0) {
1553                                 offset    += (bit_offset+BITS_PER_BYTE-1) / BITS_PER_BYTE;
1554                                 offset     = (offset + base_alignment-1) & ~alignment_mask;
1555                                 bit_offset = 0;
1556                         }
1557                 }
1558
1559                 if (byte_order_big_endian) {
1560                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1561                         member->compound_member.offset     = offset & ~alignment_mask;
1562                         member->compound_member.bit_offset = base_size - bit_offset - bit_size;
1563                 } else {
1564                         member->compound_member.offset     = offset;
1565                         member->compound_member.bit_offset = bit_offset;
1566                 }
1567
1568                 bit_offset += bit_size;
1569                 offset     += bit_offset / BITS_PER_BYTE;
1570                 bit_offset %= BITS_PER_BYTE;
1571         }
1572
1573         if (bit_offset > 0)
1574                 offset += 1;
1575
1576         *struct_offset    = offset;
1577         *struct_alignment = alignment;
1578         return member;
1579 }
1580
1581 void layout_struct_type(compound_type_t *type)
1582 {
1583         assert(type->compound != NULL);
1584
1585         compound_t *compound = type->compound;
1586         if (!compound->complete)
1587                 return;
1588         if (type->compound->layouted)
1589                 return;
1590
1591         il_size_t      offset    = 0;
1592         il_alignment_t alignment = compound->alignment;
1593         bool           need_pad  = false;
1594
1595         entity_t *entry = compound->members.entities;
1596         while (entry != NULL) {
1597                 if (entry->kind != ENTITY_COMPOUND_MEMBER) {
1598                         entry = entry->base.next;
1599                         continue;
1600                 }
1601
1602                 type_t *m_type  = entry->declaration.type;
1603                 type_t *skipped = skip_typeref(m_type);
1604                 if (! is_type_valid(skipped)) {
1605                         entry = entry->base.next;
1606                         continue;
1607                 }
1608
1609                 if (entry->compound_member.bitfield) {
1610                         entry = pack_bitfield_members(&offset, &alignment,
1611                                                       compound->packed, entry);
1612                         continue;
1613                 }
1614
1615                 il_alignment_t m_alignment = get_type_alignment_compound(m_type);
1616                 if (m_alignment > alignment)
1617                         alignment = m_alignment;
1618
1619                 if (!compound->packed) {
1620                         il_size_t new_offset = (offset + m_alignment-1) & -m_alignment;
1621
1622                         if (new_offset > offset) {
1623                                 need_pad = true;
1624                                 offset   = new_offset;
1625                         }
1626                 }
1627
1628                 entry->compound_member.offset = offset;
1629                 offset += get_type_size(m_type);
1630
1631                 entry = entry->base.next;
1632         }
1633
1634         if (!compound->packed) {
1635                 il_size_t new_offset = (offset + alignment-1) & -alignment;
1636                 if (new_offset > offset) {
1637                         need_pad = true;
1638                         offset   = new_offset;
1639                 }
1640         }
1641
1642         source_position_t const *const pos = &compound->base.source_position;
1643         if (need_pad) {
1644                 warningf(WARN_PADDED, pos, "'%T' needs padding", type);
1645         } else if (compound->packed) {
1646                 warningf(WARN_PACKED, pos, "superfluous packed attribute on '%T'", type);
1647         }
1648
1649         compound->size      = offset;
1650         compound->alignment = alignment;
1651         compound->layouted  = true;
1652 }
1653
1654 void layout_union_type(compound_type_t *type)
1655 {
1656         assert(type->compound != NULL);
1657
1658         compound_t *compound = type->compound;
1659         if (! compound->complete)
1660                 return;
1661
1662         il_size_t      size      = 0;
1663         il_alignment_t alignment = compound->alignment;
1664
1665         entity_t *entry = compound->members.entities;
1666         for (; entry != NULL; entry = entry->base.next) {
1667                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
1668                         continue;
1669
1670                 type_t *m_type = entry->declaration.type;
1671                 if (! is_type_valid(skip_typeref(m_type)))
1672                         continue;
1673
1674                 entry->compound_member.offset = 0;
1675                 il_size_t m_size = get_type_size(m_type);
1676                 if (m_size > size)
1677                         size = m_size;
1678                 il_alignment_t m_alignment = get_type_alignment_compound(m_type);
1679                 if (m_alignment > alignment)
1680                         alignment = m_alignment;
1681         }
1682         size = (size + alignment - 1) & -alignment;
1683
1684         compound->size      = size;
1685         compound->alignment = alignment;
1686 }
1687
1688 function_parameter_t *allocate_parameter(type_t *const type)
1689 {
1690         function_parameter_t *const param = obstack_alloc(&type_obst, sizeof(*param));
1691         memset(param, 0, sizeof(*param));
1692         param->type = type;
1693         return param;
1694 }
1695
1696 type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
1697                              type_t *argument_type2)
1698 {
1699         function_parameter_t *const parameter2 = allocate_parameter(argument_type2);
1700         function_parameter_t *const parameter1 = allocate_parameter(argument_type1);
1701         parameter1->next = parameter2;
1702
1703         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1704         type->function.return_type = return_type;
1705         type->function.parameters  = parameter1;
1706         type->function.linkage     = LINKAGE_C;
1707
1708         return identify_new_type(type);
1709 }
1710
1711 type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
1712 {
1713         function_parameter_t *const parameter = allocate_parameter(argument_type);
1714
1715         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1716         type->function.return_type = return_type;
1717         type->function.parameters  = parameter;
1718         type->function.linkage     = LINKAGE_C;
1719
1720         return identify_new_type(type);
1721 }
1722
1723 type_t *make_function_1_type_variadic(type_t *return_type,
1724                                       type_t *argument_type)
1725 {
1726         function_parameter_t *const parameter = allocate_parameter(argument_type);
1727
1728         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1729         type->function.return_type = return_type;
1730         type->function.parameters  = parameter;
1731         type->function.variadic    = true;
1732         type->function.linkage     = LINKAGE_C;
1733
1734         return identify_new_type(type);
1735 }
1736
1737 type_t *make_function_0_type(type_t *return_type)
1738 {
1739         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1740         type->function.return_type = return_type;
1741         type->function.parameters  = NULL;
1742         type->function.linkage     = LINKAGE_C;
1743
1744         return identify_new_type(type);
1745 }
1746
1747 type_t *make_function_type(type_t *return_type, int n_types,
1748                            type_t *const *argument_types,
1749                                                    decl_modifiers_t modifiers)
1750 {
1751         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1752         type->function.return_type = return_type;
1753         type->function.modifiers  |= modifiers;
1754         type->function.linkage     = LINKAGE_C;
1755
1756         function_parameter_t **anchor = &type->function.parameters;
1757         for (int i = 0; i < n_types; ++i) {
1758                 function_parameter_t *parameter = allocate_parameter(argument_types[i]);
1759                 *anchor = parameter;
1760                 anchor  = &parameter->next;
1761         }
1762
1763         return identify_new_type(type);
1764 }
1765
1766 /**
1767  * Debug helper. Prints the given type to stdout.
1768  */
1769 static __attribute__((unused))
1770 void dbg_type(const type_t *type)
1771 {
1772         print_to_file(stderr);
1773         print_type(type);
1774         print_string("\n");
1775         fflush(stderr);
1776 }