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 "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 "driver/firm_cmdline.h"
  36
  37 static struct obstack   _type_obst;
  38 static FILE            *out;
  39 struct obstack         *type_obst                 = &_type_obst;
  40 static bool             print_implicit_array_size = false;
  41
  42 static void intern_print_type_pre(const type_t *type);
  43 static void intern_print_type_post(const type_t *type);
  44
  45 typedef struct atomic_type_properties_t atomic_type_properties_t;
  46 struct atomic_type_properties_t {
  47         unsigned   size;              /**< type size in bytes */
  48         unsigned   alignment;         /**< type alignment in bytes */
  49         unsigned   flags;             /**< type flags from atomic_type_flag_t */
  50 };
  51
  52 /**
  53  * Properties of atomic types.
  54  */
  55 static atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
  56         //ATOMIC_TYPE_INVALID = 0,
  57         [ATOMIC_TYPE_VOID] = {
  58                 .size       = 0,
  59                 .alignment  = 0,
  60                 .flags      = ATOMIC_TYPE_FLAG_NONE
  61         },
  62         [ATOMIC_TYPE_WCHAR_T] = {
  63                 .size       = (unsigned)-1,
  64                 .alignment  = (unsigned)-1,
  65                 /* signed flag will be set when known */
  66                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  67         },
  68         [ATOMIC_TYPE_CHAR] = {
  69                 .size       = 1,
  70                 .alignment  = 1,
  71                 /* signed flag will be set when known */
  72                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  73         },
  74         [ATOMIC_TYPE_SCHAR] = {
  75                 .size       = 1,
  76                 .alignment  = 1,
  77                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  78                               | ATOMIC_TYPE_FLAG_SIGNED,
  79         },
  80         [ATOMIC_TYPE_UCHAR] = {
  81                 .size       = 1,
  82                 .alignment  = 1,
  83                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  84         },
  85         [ATOMIC_TYPE_SHORT] = {
  86                 .size       = 2,
  87                 .alignment  = 2,
  88                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  89                               | ATOMIC_TYPE_FLAG_SIGNED
  90         },
  91         [ATOMIC_TYPE_USHORT] = {
  92                 .size       = 2,
  93                 .alignment  = 2,
  94                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  95         },
  96         [ATOMIC_TYPE_INT] = {
  97                 .size       = (unsigned) -1,
  98                 .alignment  = (unsigned) -1,
  99                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 100                               | ATOMIC_TYPE_FLAG_SIGNED,
 101         },
 102         [ATOMIC_TYPE_UINT] = {
 103                 .size       = (unsigned) -1,
 104                 .alignment  = (unsigned) -1,
 105                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 106         },
 107         [ATOMIC_TYPE_LONG] = {
 108                 .size       = (unsigned) -1,
 109                 .alignment  = (unsigned) -1,
 110                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 111                               | ATOMIC_TYPE_FLAG_SIGNED,
 112         },
 113         [ATOMIC_TYPE_ULONG] = {
 114                 .size       = (unsigned) -1,
 115                 .alignment  = (unsigned) -1,
 116                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 117         },
 118         [ATOMIC_TYPE_LONGLONG] = {
 119                 .size       = (unsigned) -1,
 120                 .alignment  = (unsigned) -1,
 121                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 122                               | ATOMIC_TYPE_FLAG_SIGNED,
 123         },
 124         [ATOMIC_TYPE_ULONGLONG] = {
 125                 .size       = (unsigned) -1,
 126                 .alignment  = (unsigned) -1,
 127                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 128         },
 129         [ATOMIC_TYPE_BOOL] = {
 130                 .size       = (unsigned) -1,
 131                 .alignment  = (unsigned) -1,
 132                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 133         },
 134         [ATOMIC_TYPE_FLOAT] = {
 135                 .size       = 4,
 136                 .alignment  = (unsigned) -1,
 137                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 138                               | ATOMIC_TYPE_FLAG_SIGNED,
 139         },
 140         [ATOMIC_TYPE_DOUBLE] = {
 141                 .size       = 8,
 142                 .alignment  = (unsigned) -1,
 143                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 144                               | ATOMIC_TYPE_FLAG_SIGNED,
 145         },
 146         [ATOMIC_TYPE_LONG_DOUBLE] = {
 147                 .size       = 12,
 148                 .alignment  = (unsigned) -1,
 149                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 150                               | ATOMIC_TYPE_FLAG_SIGNED,
 151         },
 152         /* complex and imaginary types are set in init_types */
 153 };
 154
 155 void init_types(void)
 156 {
 157         obstack_init(type_obst);
 158
 159         atomic_type_properties_t *props = atomic_type_properties;
 160
 161         if (char_is_signed) {
 162                 props[ATOMIC_TYPE_CHAR].flags |= ATOMIC_TYPE_FLAG_SIGNED;
 163         }
 164
 165         unsigned int_size   = machine_size < 32 ? 2 : 4;
 166         unsigned long_size  = machine_size < 64 ? 4 : 8;
 167         unsigned llong_size = machine_size < 32 ? 4 : 8;
 168
 169         props[ATOMIC_TYPE_INT].size            = int_size;
 170         props[ATOMIC_TYPE_INT].alignment       = int_size;
 171         props[ATOMIC_TYPE_UINT].size           = int_size;
 172         props[ATOMIC_TYPE_UINT].alignment      = int_size;
 173         props[ATOMIC_TYPE_LONG].size           = long_size;
 174         props[ATOMIC_TYPE_LONG].alignment      = long_size;
 175         props[ATOMIC_TYPE_ULONG].size          = long_size;
 176         props[ATOMIC_TYPE_ULONG].alignment     = long_size;
 177         props[ATOMIC_TYPE_LONGLONG].size       = llong_size;
 178         props[ATOMIC_TYPE_LONGLONG].alignment  = llong_size;
 179         props[ATOMIC_TYPE_ULONGLONG].size      = llong_size;
 180         props[ATOMIC_TYPE_ULONGLONG].alignment = llong_size;
 181
 182         /* TODO: backend specific, need a way to query the backend for this.
 183          * The following are good settings for x86 */
 184         props[ATOMIC_TYPE_FLOAT].alignment       = 4;
 185         props[ATOMIC_TYPE_DOUBLE].alignment      = 4;
 186         props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 4;
 187         props[ATOMIC_TYPE_LONGLONG].alignment    = 4;
 188         props[ATOMIC_TYPE_ULONGLONG].alignment   = 4;
 189         if (firm_opt.os_support == OS_SUPPORT_MACHO) {
 190                 props[ATOMIC_TYPE_LONG_DOUBLE].size      = 16;
 191                 props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 16;
 192         }
 193
 194         /* TODO: make this configurable for platforms which do not use byte sized
 195          * bools. */
 196         props[ATOMIC_TYPE_BOOL] = props[ATOMIC_TYPE_UCHAR];
 197
 198         props[ATOMIC_TYPE_WCHAR_T] = props[wchar_atomic_kind];
 199 }
 200
 201 void exit_types(void)
 202 {
 203         obstack_free(type_obst, NULL);
 204 }
 205
 206 void type_set_output(FILE *stream)
 207 {
 208         out = stream;
 209 }
 210
 211 void print_type_qualifiers(type_qualifiers_t qualifiers)
 212 {
 213         int first = 1;
 214         if (qualifiers & TYPE_QUALIFIER_CONST) {
 215                 fputs(" const" + first,    out);
 216                 first = 0;
 217         }
 218         if (qualifiers & TYPE_QUALIFIER_VOLATILE) {
 219                 fputs(" volatile" + first, out);
 220                 first = 0;
 221         }
 222         if (qualifiers & TYPE_QUALIFIER_RESTRICT) {
 223                 fputs(" restrict" + first, out);
 224                 first = 0;
 225         }
 226 }
 227
 228 const char *get_atomic_kind_name(atomic_type_kind_t kind)
 229 {
 230         switch(kind) {
 231         case ATOMIC_TYPE_INVALID: break;
 232         case ATOMIC_TYPE_VOID:        return "void";
 233         case ATOMIC_TYPE_WCHAR_T:     return "wchar_t";
 234         case ATOMIC_TYPE_BOOL:        return c_mode & _CXX ? "bool" : "_Bool";
 235         case ATOMIC_TYPE_CHAR:        return "char";
 236         case ATOMIC_TYPE_SCHAR:       return "signed char";
 237         case ATOMIC_TYPE_UCHAR:       return "unsigned char";
 238         case ATOMIC_TYPE_INT:         return "int";
 239         case ATOMIC_TYPE_UINT:        return "unsigned int";
 240         case ATOMIC_TYPE_SHORT:       return "short";
 241         case ATOMIC_TYPE_USHORT:      return "unsigned short";
 242         case ATOMIC_TYPE_LONG:        return "long";
 243         case ATOMIC_TYPE_ULONG:       return "unsigned long";
 244         case ATOMIC_TYPE_LONGLONG:    return "long long";
 245         case ATOMIC_TYPE_ULONGLONG:   return "unsigned long long";
 246         case ATOMIC_TYPE_LONG_DOUBLE: return "long double";
 247         case ATOMIC_TYPE_FLOAT:       return "float";
 248         case ATOMIC_TYPE_DOUBLE:      return "double";
 249         }
 250         return "INVALIDATOMIC";
 251 }
 252
 253 /**
 254  * Prints the name of an atomic type kinds.
 255  *
 256  * @param kind  The type kind.
 257  */
 258 static void print_atomic_kinds(atomic_type_kind_t kind)
 259 {
 260         const char *s = get_atomic_kind_name(kind);
 261         fputs(s, out);
 262 }
 263
 264 /**
 265  * Prints the name of an atomic type.
 266  *
 267  * @param type  The type.
 268  */
 269 static void print_atomic_type(const atomic_type_t *type)
 270 {
 271         print_type_qualifiers(type->base.qualifiers);
 272         if (type->base.qualifiers != 0)
 273                 fputc(' ', out);
 274         print_atomic_kinds(type->akind);
 275 }
 276
 277 /**
 278  * Prints the name of a complex type.
 279  *
 280  * @param type  The type.
 281  */
 282 static
 283 void print_complex_type(const complex_type_t *type)
 284 {
 285         int empty = type->base.qualifiers == 0;
 286         print_type_qualifiers(type->base.qualifiers);
 287         fputs(" _Complex " + empty, out);
 288         print_atomic_kinds(type->akind);
 289 }
 290
 291 /**
 292  * Prints the name of an imaginary type.
 293  *
 294  * @param type  The type.
 295  */
 296 static
 297 void print_imaginary_type(const imaginary_type_t *type)
 298 {
 299         int empty = type->base.qualifiers == 0;
 300         print_type_qualifiers(type->base.qualifiers);
 301         fputs(" _Imaginary " + empty, out);
 302         print_atomic_kinds(type->akind);
 303 }
 304
 305 /**
 306  * Print the first part (the prefix) of a type.
 307  *
 308  * @param type   The type to print.
 309  */
 310 static void print_function_type_pre(const function_type_t *type)
 311 {
 312         switch (type->linkage) {
 313                 case LINKAGE_INVALID:
 314                         break;
 315
 316                 case LINKAGE_C:
 317                         if (c_mode & _CXX)
 318                                 fputs("extern \"C\" ",   out);
 319                         break;
 320
 321                 case LINKAGE_CXX:
 322                         if (!(c_mode & _CXX))
 323                                 fputs("extern \"C++\" ", out);
 324                         break;
 325         }
 326
 327         print_type_qualifiers(type->base.qualifiers);
 328         if (type->base.qualifiers != 0)
 329                 fputc(' ', out);
 330
 331         intern_print_type_pre(type->return_type);
 332
 333         switch (type->calling_convention) {
 334         case CC_CDECL:    fputs(" __cdecl",    out); break;
 335         case CC_STDCALL:  fputs(" __stdcall",  out); break;
 336         case CC_FASTCALL: fputs(" __fastcall", out); break;
 337         case CC_THISCALL: fputs(" __thiscall", out); break;
 338         case CC_DEFAULT:  break;
 339         }
 340 }
 341
 342 /**
 343  * Print the second part (the postfix) of a type.
 344  *
 345  * @param type   The type to print.
 346  */
 347 static void print_function_type_post(const function_type_t *type,
 348                                      const scope_t *parameters)
 349 {
 350         fputc('(', out);
 351         bool first = true;
 352         if (parameters == NULL) {
 353                 function_parameter_t *parameter = type->parameters;
 354                 for( ; parameter != NULL; parameter = parameter->next) {
 355                         if (first) {
 356                                 first = false;
 357                         } else {
 358                                 fputs(", ", out);
 359                         }
 360                         print_type(parameter->type);
 361                 }
 362         } else {
 363                 entity_t *parameter = parameters->entities;
 364                 for (; parameter != NULL; parameter = parameter->base.next) {
 365                         if (parameter->kind != ENTITY_PARAMETER)
 366                                 continue;
 367
 368                         if (first) {
 369                                 first = false;
 370                         } else {
 371                                 fputs(", ", out);
 372                         }
 373                         const type_t *const type = parameter->declaration.type;
 374                         if (type == NULL) {
 375                                 fputs(parameter->base.symbol->string, out);
 376                         } else {
 377                                 print_type_ext(type, parameter->base.symbol, NULL);
 378                         }
 379                 }
 380         }
 381         if (type->variadic) {
 382                 if (first) {
 383                         first = false;
 384                 } else {
 385                         fputs(", ", out);
 386                 }
 387                 fputs("...", out);
 388         }
 389         if (first && !type->unspecified_parameters) {
 390                 fputs("void", out);
 391         }
 392         fputc(')', out);
 393
 394         intern_print_type_post(type->return_type);
 395 }
 396
 397 /**
 398  * Prints the prefix part of a pointer type.
 399  *
 400  * @param type   The pointer type.
 401  */
 402 static void print_pointer_type_pre(const pointer_type_t *type)
 403 {
 404         type_t const *const points_to = type->points_to;
 405         intern_print_type_pre(points_to);
 406         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 407                 fputs(" (", out);
 408         variable_t *const variable = type->base_variable;
 409         if (variable != NULL) {
 410                 fputs(" __based(", out);
 411                 fputs(variable->base.base.symbol->string, out);
 412                 fputs(") ", out);
 413         }
 414         fputc('*', out);
 415         type_qualifiers_t const qual = type->base.qualifiers;
 416         if (qual != 0)
 417                 fputc(' ', out);
 418         print_type_qualifiers(qual);
 419 }
 420
 421 /**
 422  * Prints the postfix part of a pointer type.
 423  *
 424  * @param type   The pointer type.
 425  */
 426 static void print_pointer_type_post(const pointer_type_t *type)
 427 {
 428         type_t const *const points_to = type->points_to;
 429         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 430                 fputc(')', out);
 431         intern_print_type_post(points_to);
 432 }
 433
 434 /**
 435  * Prints the prefix part of a reference type.
 436  *
 437  * @param type   The reference type.
 438  */
 439 static void print_reference_type_pre(const reference_type_t *type)
 440 {
 441         type_t const *const refers_to = type->refers_to;
 442         intern_print_type_pre(refers_to);
 443         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 444                 fputs(" (", out);
 445         fputc('&', out);
 446 }
 447
 448 /**
 449  * Prints the postfix part of a reference type.
 450  *
 451  * @param type   The reference type.
 452  */
 453 static void print_reference_type_post(const reference_type_t *type)
 454 {
 455         type_t const *const refers_to = type->refers_to;
 456         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 457                 fputc(')', out);
 458         intern_print_type_post(refers_to);
 459 }
 460
 461 /**
 462  * Prints the prefix part of an array type.
 463  *
 464  * @param type   The array type.
 465  */
 466 static void print_array_type_pre(const array_type_t *type)
 467 {
 468         intern_print_type_pre(type->element_type);
 469 }
 470
 471 /**
 472  * Prints the postfix part of an array type.
 473  *
 474  * @param type   The array type.
 475  */
 476 static void print_array_type_post(const array_type_t *type)
 477 {
 478         fputc('[', out);
 479         if (type->is_static) {
 480                 fputs("static ", out);
 481         }
 482         print_type_qualifiers(type->base.qualifiers);
 483         if (type->base.qualifiers != 0)
 484                 fputc(' ', out);
 485         if (type->size_expression != NULL
 486                         && (print_implicit_array_size || !type->has_implicit_size)) {
 487                 print_expression(type->size_expression);
 488         }
 489         fputc(']', out);
 490         intern_print_type_post(type->element_type);
 491 }
 492
 493 /**
 494  * Prints the postfix part of a bitfield type.
 495  *
 496  * @param type   The array type.
 497  */
 498 static void print_bitfield_type_post(const bitfield_type_t *type)
 499 {
 500         fputs(" : ", out);
 501         print_expression(type->size_expression);
 502         intern_print_type_post(type->base_type);
 503 }
 504
 505 /**
 506  * Prints an enum definition.
 507  *
 508  * @param declaration  The enum's type declaration.
 509  */
 510 void print_enum_definition(const enum_t *enume)
 511 {
 512         fputs("{\n", out);
 513
 514         change_indent(1);
 515
 516         entity_t *entry = enume->base.next;
 517         for( ; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
 518                entry = entry->base.next) {
 519
 520                 print_indent();
 521                 fputs(entry->base.symbol->string, out);
 522                 if (entry->enum_value.value != NULL) {
 523                         fputs(" = ", out);
 524
 525                         /* skip the implicit cast */
 526                         expression_t *expression = entry->enum_value.value;
 527                         if (expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
 528                                 expression = expression->unary.value;
 529                         }
 530                         print_expression(expression);
 531                 }
 532                 fputs(",\n", out);
 533         }
 534
 535         change_indent(-1);
 536         print_indent();
 537         fputc('}', out);
 538 }
 539
 540 /**
 541  * Prints an enum type.
 542  *
 543  * @param type  The enum type.
 544  */
 545 static void print_type_enum(const enum_type_t *type)
 546 {
 547         int empty = type->base.qualifiers == 0;
 548         print_type_qualifiers(type->base.qualifiers);
 549         fputs(" enum " + empty, out);
 550
 551         enum_t   *enume  = type->enume;
 552         symbol_t *symbol = enume->base.symbol;
 553         if (symbol != NULL) {
 554                 fputs(symbol->string, out);
 555         } else {
 556                 print_enum_definition(enume);
 557         }
 558 }
 559
 560 /**
 561  * Print the compound part of a compound type.
 562  */
 563 void print_compound_definition(const compound_t *compound)
 564 {
 565         fputs("{\n", out);
 566         change_indent(1);
 567
 568         entity_t *entity = compound->members.entities;
 569         for( ; entity != NULL; entity = entity->base.next) {
 570                 if (entity->kind != ENTITY_COMPOUND_MEMBER)
 571                         continue;
 572
 573                 print_indent();
 574                 print_entity(entity);
 575                 fputc('\n', out);
 576         }
 577
 578         change_indent(-1);
 579         print_indent();
 580         fputc('}', out);
 581         if (compound->modifiers & DM_TRANSPARENT_UNION) {
 582                 fputs("__attribute__((__transparent_union__))", out);
 583         }
 584 }
 585
 586 /**
 587  * Prints a compound type.
 588  *
 589  * @param type  The compound type.
 590  */
 591 static void print_compound_type(const compound_type_t *type)
 592 {
 593         int empty = type->base.qualifiers == 0;
 594         print_type_qualifiers(type->base.qualifiers);
 595
 596         if (type->base.kind == TYPE_COMPOUND_STRUCT) {
 597                 fputs(" struct " + empty, out);
 598         } else {
 599                 assert(type->base.kind == TYPE_COMPOUND_UNION);
 600                 fputs(" union " + empty, out);
 601         }
 602
 603         compound_t *compound = type->compound;
 604         symbol_t   *symbol   = compound->base.symbol;
 605         if (symbol != NULL) {
 606                 fputs(symbol->string, out);
 607         } else {
 608                 print_compound_definition(compound);
 609         }
 610 }
 611
 612 /**
 613  * Prints the prefix part of a typedef type.
 614  *
 615  * @param type   The typedef type.
 616  */
 617 static void print_typedef_type_pre(const typedef_type_t *const type)
 618 {
 619         print_type_qualifiers(type->base.qualifiers);
 620         if (type->base.qualifiers != 0)
 621                 fputc(' ', out);
 622         fputs(type->typedefe->base.symbol->string, out);
 623 }
 624
 625 /**
 626  * Prints the prefix part of a typeof type.
 627  *
 628  * @param type   The typeof type.
 629  */
 630 static void print_typeof_type_pre(const typeof_type_t *const type)
 631 {
 632         fputs("typeof(", out);
 633         if (type->expression != NULL) {
 634                 print_expression(type->expression);
 635         } else {
 636                 print_type(type->typeof_type);
 637         }
 638         fputc(')', out);
 639 }
 640
 641 /**
 642  * Prints the prefix part of a type.
 643  *
 644  * @param type   The type.
 645  */
 646 static void intern_print_type_pre(const type_t *const type)
 647 {
 648         switch(type->kind) {
 649         case TYPE_ERROR:
 650                 fputs("<error>", out);
 651                 return;
 652         case TYPE_INVALID:
 653                 fputs("<invalid>", out);
 654                 return;
 655         case TYPE_ENUM:
 656                 print_type_enum(&type->enumt);
 657                 return;
 658         case TYPE_ATOMIC:
 659                 print_atomic_type(&type->atomic);
 660                 return;
 661         case TYPE_COMPLEX:
 662                 print_complex_type(&type->complex);
 663                 return;
 664         case TYPE_IMAGINARY:
 665                 print_imaginary_type(&type->imaginary);
 666                 return;
 667         case TYPE_COMPOUND_STRUCT:
 668         case TYPE_COMPOUND_UNION:
 669                 print_compound_type(&type->compound);
 670                 return;
 671         case TYPE_BUILTIN:
 672                 fputs(type->builtin.symbol->string, out);
 673                 return;
 674         case TYPE_FUNCTION:
 675                 print_function_type_pre(&type->function);
 676                 return;
 677         case TYPE_POINTER:
 678                 print_pointer_type_pre(&type->pointer);
 679                 return;
 680         case TYPE_REFERENCE:
 681                 print_reference_type_pre(&type->reference);
 682                 return;
 683         case TYPE_BITFIELD:
 684                 intern_print_type_pre(type->bitfield.base_type);
 685                 return;
 686         case TYPE_ARRAY:
 687                 print_array_type_pre(&type->array);
 688                 return;
 689         case TYPE_TYPEDEF:
 690                 print_typedef_type_pre(&type->typedeft);
 691                 return;
 692         case TYPE_TYPEOF:
 693                 print_typeof_type_pre(&type->typeoft);
 694                 return;
 695         }
 696         fputs("unknown", out);
 697 }
 698
 699 /**
 700  * Prints the postfix part of a type.
 701  *
 702  * @param type   The type.
 703  */
 704 static void intern_print_type_post(const type_t *const type)
 705 {
 706         switch(type->kind) {
 707         case TYPE_FUNCTION:
 708                 print_function_type_post(&type->function, NULL);
 709                 return;
 710         case TYPE_POINTER:
 711                 print_pointer_type_post(&type->pointer);
 712                 return;
 713         case TYPE_REFERENCE:
 714                 print_reference_type_post(&type->reference);
 715                 return;
 716         case TYPE_ARRAY:
 717                 print_array_type_post(&type->array);
 718                 return;
 719         case TYPE_BITFIELD:
 720                 print_bitfield_type_post(&type->bitfield);
 721                 return;
 722         case TYPE_ERROR:
 723         case TYPE_INVALID:
 724         case TYPE_ATOMIC:
 725         case TYPE_COMPLEX:
 726         case TYPE_IMAGINARY:
 727         case TYPE_ENUM:
 728         case TYPE_COMPOUND_STRUCT:
 729         case TYPE_COMPOUND_UNION:
 730         case TYPE_BUILTIN:
 731         case TYPE_TYPEOF:
 732         case TYPE_TYPEDEF:
 733                 break;
 734         }
 735 }
 736
 737 /**
 738  * Prints a type.
 739  *
 740  * @param type   The type.
 741  */
 742 void print_type(const type_t *const type)
 743 {
 744         print_type_ext(type, NULL, NULL);
 745 }
 746
 747 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 748                     const scope_t *parameters)
 749 {
 750         if (type == NULL) {
 751                 fputs("nil type", out);
 752                 return;
 753         }
 754
 755         intern_print_type_pre(type);
 756         if (symbol != NULL) {
 757                 fputc(' ', out);
 758                 fputs(symbol->string, out);
 759         }
 760         if (type->kind == TYPE_FUNCTION) {
 761                 print_function_type_post(&type->function, parameters);
 762         } else {
 763                 intern_print_type_post(type);
 764         }
 765 }
 766
 767 /**
 768  * Return the size of a type AST node.
 769  *
 770  * @param type  The type.
 771  */
 772 static size_t get_type_struct_size(const type_t *type)
 773 {
 774         switch(type->kind) {
 775         case TYPE_ATOMIC:          return sizeof(atomic_type_t);
 776         case TYPE_COMPLEX:         return sizeof(complex_type_t);
 777         case TYPE_IMAGINARY:       return sizeof(imaginary_type_t);
 778         case TYPE_COMPOUND_STRUCT:
 779         case TYPE_COMPOUND_UNION:  return sizeof(compound_type_t);
 780         case TYPE_ENUM:            return sizeof(enum_type_t);
 781         case TYPE_FUNCTION:        return sizeof(function_type_t);
 782         case TYPE_POINTER:         return sizeof(pointer_type_t);
 783         case TYPE_REFERENCE:       return sizeof(reference_type_t);
 784         case TYPE_ARRAY:           return sizeof(array_type_t);
 785         case TYPE_BUILTIN:         return sizeof(builtin_type_t);
 786         case TYPE_TYPEDEF:         return sizeof(typedef_type_t);
 787         case TYPE_TYPEOF:          return sizeof(typeof_type_t);
 788         case TYPE_BITFIELD:        return sizeof(bitfield_type_t);
 789         case TYPE_ERROR:           panic("error type found");
 790         case TYPE_INVALID:         panic("invalid type found");
 791         }
 792         panic("unknown type found");
 793 }
 794
 795 /**
 796  * Duplicates a type.
 797  *
 798  * @param type  The type to copy.
 799  * @return A copy of the type.
 800  *
 801  * @note This does not produce a deep copy!
 802  */
 803 type_t *duplicate_type(const type_t *type)
 804 {
 805         size_t size = get_type_struct_size(type);
 806
 807         type_t *copy = obstack_alloc(type_obst, size);
 808         memcpy(copy, type, size);
 809         copy->base.firm_type = NULL;
 810
 811         return copy;
 812 }
 813
 814 /**
 815  * Returns the unqualified type of a given type.
 816  *
 817  * @param type  The type.
 818  * @returns The unqualified type.
 819  */
 820 type_t *get_unqualified_type(type_t *type)
 821 {
 822         assert(!is_typeref(type));
 823
 824         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 825                 return type;
 826
 827         type_t *unqualified_type          = duplicate_type(type);
 828         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 829
 830         return identify_new_type(unqualified_type);
 831 }
 832
 833 type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual)
 834 {
 835         type_t *type = skip_typeref(orig_type);
 836
 837         type_t *copy;
 838         if (is_type_array(type)) {
 839                 /* For array types the element type has to be adjusted */
 840                 type_t *element_type      = type->array.element_type;
 841                 type_t *qual_element_type = get_qualified_type(element_type, qual);
 842
 843                 if (qual_element_type == element_type)
 844                         return orig_type;
 845
 846                 copy                     = duplicate_type(type);
 847                 copy->array.element_type = qual_element_type;
 848         } else if (is_type_valid(type)) {
 849                 if ((type->base.qualifiers & qual) == qual)
 850                         return orig_type;
 851
 852                 copy                   = duplicate_type(type);
 853                 copy->base.qualifiers |= qual;
 854         } else {
 855                 return type;
 856         }
 857
 858         return identify_new_type(copy);
 859 }
 860
 861 /**
 862  * Check if a type is valid.
 863  *
 864  * @param type  The type to check.
 865  * @return true if type represents a valid type.
 866  */
 867 bool type_valid(const type_t *type)
 868 {
 869         return type->kind != TYPE_INVALID;
 870 }
 871
 872 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 873                                   atomic_type_flag_t flag)
 874 {
 875         assert(kind <= ATOMIC_TYPE_LAST);
 876         return (atomic_type_properties[kind].flags & flag) != 0;
 877 }
 878
 879 /**
 880  * Returns true if the given type is an integer type.
 881  *
 882  * @param type  The type to check.
 883  * @return True if type is an integer type.
 884  */
 885 bool is_type_integer(const type_t *type)
 886 {
 887         assert(!is_typeref(type));
 888
 889         if (type->kind == TYPE_ENUM)
 890                 return true;
 891         if (type->kind == TYPE_BITFIELD)
 892                 return true;
 893
 894         if (type->kind != TYPE_ATOMIC)
 895                 return false;
 896
 897         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 898 }
 899
 900 /**
 901  * Returns true if the given type is an enum type.
 902  *
 903  * @param type  The type to check.
 904  * @return True if type is an enum type.
 905  */
 906 bool is_type_enum(const type_t *type)
 907 {
 908         assert(!is_typeref(type));
 909         return type->kind == TYPE_ENUM;
 910 }
 911
 912 /**
 913  * Returns true if the given type is an floating point type.
 914  *
 915  * @param type  The type to check.
 916  * @return True if type is a floating point type.
 917  */
 918 bool is_type_float(const type_t *type)
 919 {
 920         assert(!is_typeref(type));
 921
 922         if (type->kind != TYPE_ATOMIC)
 923                 return false;
 924
 925         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 926 }
 927
 928 /**
 929  * Returns true if the given type is an complex type.
 930  *
 931  * @param type  The type to check.
 932  * @return True if type is a complex type.
 933  */
 934 bool is_type_complex(const type_t *type)
 935 {
 936         assert(!is_typeref(type));
 937
 938         if (type->kind != TYPE_ATOMIC)
 939                 return false;
 940
 941         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_COMPLEX);
 942 }
 943
 944 /**
 945  * Returns true if the given type is a signed type.
 946  *
 947  * @param type  The type to check.
 948  * @return True if type is a signed type.
 949  */
 950 bool is_type_signed(const type_t *type)
 951 {
 952         assert(!is_typeref(type));
 953
 954         /* enum types are int for now */
 955         if (type->kind == TYPE_ENUM)
 956                 return true;
 957         if (type->kind == TYPE_BITFIELD)
 958                 return is_type_signed(type->bitfield.base_type);
 959
 960         if (type->kind != TYPE_ATOMIC)
 961                 return false;
 962
 963         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 964 }
 965
 966 /**
 967  * Returns true if the given type represents an arithmetic type.
 968  *
 969  * @param type  The type to check.
 970  * @return True if type represents an arithmetic type.
 971  */
 972 bool is_type_arithmetic(const type_t *type)
 973 {
 974         assert(!is_typeref(type));
 975
 976         switch(type->kind) {
 977         case TYPE_BITFIELD:
 978         case TYPE_ENUM:
 979                 return true;
 980         case TYPE_ATOMIC:
 981                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 982         case TYPE_COMPLEX:
 983                 return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 984         case TYPE_IMAGINARY:
 985                 return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 986         default:
 987                 return false;
 988         }
 989 }
 990
 991 /**
 992  * Returns true if the given type is an integer or float type.
 993  *
 994  * @param type  The type to check.
 995  * @return True if type is an integer or float type.
 996  */
 997 bool is_type_real(const type_t *type)
 998 {
 999         /* 6.2.5 (17) */
1000         return is_type_integer(type) || is_type_float(type);
1001 }
1002
1003 /**
1004  * Returns true if the given type represents a scalar type.
1005  *
1006  * @param type  The type to check.
1007  * @return True if type represents a scalar type.
1008  */
1009 bool is_type_scalar(const type_t *type)
1010 {
1011         assert(!is_typeref(type));
1012
1013         switch (type->kind) {
1014                 case TYPE_POINTER: return true;
1015                 case TYPE_BUILTIN: return is_type_scalar(type->builtin.real_type);
1016                 default:           break;
1017         }
1018
1019         return is_type_arithmetic(type);
1020 }
1021
1022 /**
1023  * Check if a given type is incomplete.
1024  *
1025  * @param type  The type to check.
1026  * @return True if the given type is incomplete (ie. just forward).
1027  */
1028 bool is_type_incomplete(const type_t *type)
1029 {
1030         assert(!is_typeref(type));
1031
1032         switch(type->kind) {
1033         case TYPE_COMPOUND_STRUCT:
1034         case TYPE_COMPOUND_UNION: {
1035                 const compound_type_t *compound_type = &type->compound;
1036                 return !compound_type->compound->complete;
1037         }
1038         case TYPE_ENUM:
1039                 return false;
1040
1041         case TYPE_ARRAY:
1042                 return type->array.size_expression == NULL
1043                         && !type->array.size_constant;
1044
1045         case TYPE_ATOMIC:
1046                 return type->atomic.akind == ATOMIC_TYPE_VOID;
1047
1048         case TYPE_COMPLEX:
1049                 return type->complex.akind == ATOMIC_TYPE_VOID;
1050
1051         case TYPE_IMAGINARY:
1052                 return type->imaginary.akind == ATOMIC_TYPE_VOID;
1053
1054         case TYPE_BITFIELD:
1055         case TYPE_FUNCTION:
1056         case TYPE_POINTER:
1057         case TYPE_REFERENCE:
1058         case TYPE_BUILTIN:
1059         case TYPE_ERROR:
1060                 return false;
1061
1062         case TYPE_TYPEDEF:
1063         case TYPE_TYPEOF:
1064                 panic("is_type_incomplete called without typerefs skipped");
1065         case TYPE_INVALID:
1066                 break;
1067         }
1068
1069         panic("invalid type found");
1070 }
1071
1072 bool is_type_object(const type_t *type)
1073 {
1074         return !is_type_function(type) && !is_type_incomplete(type);
1075 }
1076
1077 bool is_builtin_va_list(type_t *type)
1078 {
1079         type_t *tp = skip_typeref(type);
1080
1081         return tp->kind == type_valist->kind &&
1082                tp->builtin.symbol == type_valist->builtin.symbol;
1083 }
1084
1085 /**
1086  * Check if two function types are compatible.
1087  */
1088 static bool function_types_compatible(const function_type_t *func1,
1089                                       const function_type_t *func2)
1090 {
1091         const type_t* const ret1 = skip_typeref(func1->return_type);
1092         const type_t* const ret2 = skip_typeref(func2->return_type);
1093         if (!types_compatible(ret1, ret2))
1094                 return false;
1095
1096         if (func1->linkage != func2->linkage)
1097                 return false;
1098
1099         if (func1->calling_convention != func2->calling_convention)
1100                 return false;
1101
1102         /* can parameters be compared? */
1103         if (func1->unspecified_parameters || func2->unspecified_parameters)
1104                 return true;
1105
1106         if (func1->variadic != func2->variadic)
1107                 return false;
1108
1109         /* TODO: handling of unspecified parameters not correct yet */
1110
1111         /* all argument types must be compatible */
1112         function_parameter_t *parameter1 = func1->parameters;
1113         function_parameter_t *parameter2 = func2->parameters;
1114         for ( ; parameter1 != NULL && parameter2 != NULL;
1115                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
1116                 type_t *parameter1_type = skip_typeref(parameter1->type);
1117                 type_t *parameter2_type = skip_typeref(parameter2->type);
1118
1119                 parameter1_type = get_unqualified_type(parameter1_type);
1120                 parameter2_type = get_unqualified_type(parameter2_type);
1121
1122                 if (!types_compatible(parameter1_type, parameter2_type))
1123                         return false;
1124         }
1125         /* same number of arguments? */
1126         if (parameter1 != NULL || parameter2 != NULL)
1127                 return false;
1128
1129         return true;
1130 }
1131
1132 /**
1133  * Check if two array types are compatible.
1134  */
1135 static bool array_types_compatible(const array_type_t *array1,
1136                                    const array_type_t *array2)
1137 {
1138         type_t *element_type1 = skip_typeref(array1->element_type);
1139         type_t *element_type2 = skip_typeref(array2->element_type);
1140         if (!types_compatible(element_type1, element_type2))
1141                 return false;
1142
1143         if (!array1->size_constant || !array2->size_constant)
1144                 return true;
1145
1146         return array1->size == array2->size;
1147 }
1148
1149 /**
1150  * Check if two types are compatible.
1151  */
1152 bool types_compatible(const type_t *type1, const type_t *type2)
1153 {
1154         assert(!is_typeref(type1));
1155         assert(!is_typeref(type2));
1156
1157         /* shortcut: the same type is always compatible */
1158         if (type1 == type2)
1159                 return true;
1160
1161         if (!is_type_valid(type1) || !is_type_valid(type2))
1162                 return true;
1163
1164         if (type1->base.qualifiers != type2->base.qualifiers)
1165                 return false;
1166         if (type1->kind != type2->kind)
1167                 return false;
1168
1169         switch (type1->kind) {
1170         case TYPE_FUNCTION:
1171                 return function_types_compatible(&type1->function, &type2->function);
1172         case TYPE_ATOMIC:
1173                 return type1->atomic.akind == type2->atomic.akind;
1174         case TYPE_COMPLEX:
1175                 return type1->complex.akind == type2->complex.akind;
1176         case TYPE_IMAGINARY:
1177                 return type1->imaginary.akind == type2->imaginary.akind;
1178         case TYPE_ARRAY:
1179                 return array_types_compatible(&type1->array, &type2->array);
1180
1181         case TYPE_POINTER: {
1182                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
1183                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
1184                 return types_compatible(to1, to2);
1185         }
1186
1187         case TYPE_REFERENCE: {
1188                 const type_t *const to1 = skip_typeref(type1->reference.refers_to);
1189                 const type_t *const to2 = skip_typeref(type2->reference.refers_to);
1190                 return types_compatible(to1, to2);
1191         }
1192
1193         case TYPE_COMPOUND_STRUCT:
1194         case TYPE_COMPOUND_UNION: {
1195
1196
1197                 break;
1198         }
1199         case TYPE_ENUM:
1200         case TYPE_BUILTIN:
1201                 /* TODO: not implemented */
1202                 break;
1203
1204         case TYPE_BITFIELD:
1205                 /* not sure if this makes sense or is even needed, implement it if you
1206                  * really need it! */
1207                 panic("type compatibility check for bitfield type");
1208
1209         case TYPE_ERROR:
1210                 /* Hmm, the error type should be compatible to all other types */
1211                 return true;
1212         case TYPE_INVALID:
1213                 panic("invalid type found in compatible types");
1214         case TYPE_TYPEDEF:
1215         case TYPE_TYPEOF:
1216                 panic("typerefs not skipped in compatible types?!?");
1217         }
1218
1219         /* TODO: incomplete */
1220         return false;
1221 }
1222
1223 /**
1224  * Skip all typerefs and return the underlying type.
1225  */
1226 type_t *skip_typeref(type_t *type)
1227 {
1228         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1229
1230         while (true) {
1231                 switch (type->kind) {
1232                 case TYPE_ERROR:
1233                         return type;
1234                 case TYPE_TYPEDEF: {
1235                         qualifiers |= type->base.qualifiers;
1236
1237                         const typedef_type_t *typedef_type = &type->typedeft;
1238                         if (typedef_type->resolved_type != NULL) {
1239                                 type = typedef_type->resolved_type;
1240                                 break;
1241                         }
1242                         type = typedef_type->typedefe->type;
1243                         continue;
1244                 }
1245                 case TYPE_TYPEOF:
1246                         qualifiers |= type->base.qualifiers;
1247                         type        = type->typeoft.typeof_type;
1248                         continue;
1249                 default:
1250                         break;
1251                 }
1252                 break;
1253         }
1254
1255         if (qualifiers != TYPE_QUALIFIER_NONE) {
1256                 type_t *const copy = duplicate_type(type);
1257
1258                 /* for const with typedefed array type the element type has to be
1259                  * adjusted */
1260                 if (is_type_array(copy)) {
1261                         type_t *element_type           = copy->array.element_type;
1262                         element_type                   = duplicate_type(element_type);
1263                         element_type->base.qualifiers |= qualifiers;
1264                         copy->array.element_type       = element_type;
1265                 } else {
1266                         copy->base.qualifiers |= qualifiers;
1267                 }
1268
1269                 type = identify_new_type(copy);
1270         }
1271
1272         return type;
1273 }
1274
1275 unsigned get_type_size(type_t *type)
1276 {
1277         switch (type->kind) {
1278         case TYPE_INVALID:
1279                 break;
1280         case TYPE_ERROR:
1281                 return 0;
1282         case TYPE_ATOMIC:
1283                 return get_atomic_type_size(type->atomic.akind);
1284         case TYPE_COMPLEX:
1285                 return get_atomic_type_size(type->complex.akind) * 2;
1286         case TYPE_IMAGINARY:
1287                 return get_atomic_type_size(type->imaginary.akind);
1288         case TYPE_COMPOUND_UNION:
1289                 layout_union_type(&type->compound);
1290                 return type->compound.compound->size;
1291         case TYPE_COMPOUND_STRUCT:
1292                 layout_struct_type(&type->compound);
1293                 return type->compound.compound->size;
1294         case TYPE_ENUM:
1295                 return get_atomic_type_size(type->enumt.akind);
1296         case TYPE_FUNCTION:
1297                 return 0; /* non-const (but "address-const") */
1298         case TYPE_REFERENCE:
1299         case TYPE_POINTER:
1300                 /* TODO: make configurable by backend */
1301                 return 4;
1302         case TYPE_ARRAY: {
1303                 /* TODO: correct if element_type is aligned? */
1304                 il_size_t element_size = get_type_size(type->array.element_type);
1305                 return type->array.size * element_size;
1306         }
1307         case TYPE_BITFIELD:
1308                 return 0;
1309         case TYPE_BUILTIN:
1310                 return get_type_size(type->builtin.real_type);
1311         case TYPE_TYPEDEF:
1312                 return get_type_size(type->typedeft.typedefe->type);
1313         case TYPE_TYPEOF:
1314                 if (type->typeoft.typeof_type) {
1315                         return get_type_size(type->typeoft.typeof_type);
1316                 } else {
1317                         return get_type_size(type->typeoft.expression->base.type);
1318                 }
1319         }
1320         panic("invalid type in get_type_size");
1321 }
1322
1323 unsigned get_type_alignment(type_t *type)
1324 {
1325         switch (type->kind) {
1326         case TYPE_INVALID:
1327                 break;
1328         case TYPE_ERROR:
1329                 return 0;
1330         case TYPE_ATOMIC:
1331                 return get_atomic_type_alignment(type->atomic.akind);
1332         case TYPE_COMPLEX:
1333                 return get_atomic_type_alignment(type->complex.akind);
1334         case TYPE_IMAGINARY:
1335                 return get_atomic_type_alignment(type->imaginary.akind);
1336         case TYPE_COMPOUND_UNION:
1337                 layout_union_type(&type->compound);
1338                 return type->compound.compound->alignment;
1339         case TYPE_COMPOUND_STRUCT:
1340                 layout_struct_type(&type->compound);
1341                 return type->compound.compound->alignment;
1342         case TYPE_ENUM:
1343                 return get_atomic_type_alignment(type->enumt.akind);
1344         case TYPE_FUNCTION:
1345                 /* what is correct here? */
1346                 return 4;
1347         case TYPE_REFERENCE:
1348         case TYPE_POINTER:
1349                 /* TODO: make configurable by backend */
1350                 return 4;
1351         case TYPE_ARRAY:
1352                 return get_type_alignment(type->array.element_type);
1353         case TYPE_BITFIELD:
1354                 return 0;
1355         case TYPE_BUILTIN:
1356                 return get_type_alignment(type->builtin.real_type);
1357         case TYPE_TYPEDEF: {
1358                 il_alignment_t alignment
1359                         = get_type_alignment(type->typedeft.typedefe->type);
1360                 if (type->typedeft.typedefe->alignment > alignment)
1361                         alignment = type->typedeft.typedefe->alignment;
1362
1363                 return alignment;
1364         }
1365         case TYPE_TYPEOF:
1366                 if (type->typeoft.typeof_type) {
1367                         return get_type_alignment(type->typeoft.typeof_type);
1368                 } else {
1369                         return get_type_alignment(type->typeoft.expression->base.type);
1370                 }
1371         }
1372         panic("invalid type in get_type_alignment");
1373 }
1374
1375 decl_modifiers_t get_type_modifiers(const type_t *type)
1376 {
1377         switch(type->kind) {
1378         case TYPE_INVALID:
1379         case TYPE_ERROR:
1380                 break;
1381         case TYPE_COMPOUND_STRUCT:
1382         case TYPE_COMPOUND_UNION:
1383                 return type->compound.compound->modifiers;
1384         case TYPE_FUNCTION:
1385                 return type->function.modifiers;
1386         case TYPE_ENUM:
1387         case TYPE_ATOMIC:
1388         case TYPE_COMPLEX:
1389         case TYPE_IMAGINARY:
1390         case TYPE_REFERENCE:
1391         case TYPE_POINTER:
1392         case TYPE_BITFIELD:
1393         case TYPE_ARRAY:
1394                 return 0;
1395         case TYPE_BUILTIN:
1396                 return get_type_modifiers(type->builtin.real_type);
1397         case TYPE_TYPEDEF: {
1398                 decl_modifiers_t modifiers = type->typedeft.typedefe->modifiers;
1399                 modifiers |= get_type_modifiers(type->typedeft.typedefe->type);
1400                 return modifiers;
1401         }
1402         case TYPE_TYPEOF:
1403                 if (type->typeoft.typeof_type) {
1404                         return get_type_modifiers(type->typeoft.typeof_type);
1405                 } else {
1406                         return get_type_modifiers(type->typeoft.expression->base.type);
1407                 }
1408         }
1409         panic("invalid type found in get_type_modifiers");
1410 }
1411
1412 type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type)
1413 {
1414         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1415
1416         while (true) {
1417                 switch (type->base.kind) {
1418                 case TYPE_ERROR:
1419                         return TYPE_QUALIFIER_NONE;
1420                 case TYPE_TYPEDEF:
1421                         qualifiers |= type->base.qualifiers;
1422                         const typedef_type_t *typedef_type = &type->typedeft;
1423                         if (typedef_type->resolved_type != NULL)
1424                                 type = typedef_type->resolved_type;
1425                         else
1426                                 type = typedef_type->typedefe->type;
1427                         continue;
1428                 case TYPE_TYPEOF:
1429                         type = type->typeoft.typeof_type;
1430                         continue;
1431                 case TYPE_ARRAY:
1432                         if (skip_array_type) {
1433                                 type = type->array.element_type;
1434                                 continue;
1435                         }
1436                         break;
1437                 default:
1438                         break;
1439                 }
1440                 break;
1441         }
1442         return type->base.qualifiers | qualifiers;
1443 }
1444
1445 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1446 {
1447         assert(kind <= ATOMIC_TYPE_LAST);
1448         return atomic_type_properties[kind].size;
1449 }
1450
1451 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1452 {
1453         assert(kind <= ATOMIC_TYPE_LAST);
1454         return atomic_type_properties[kind].alignment;
1455 }
1456
1457 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1458 {
1459         assert(kind <= ATOMIC_TYPE_LAST);
1460         return atomic_type_properties[kind].flags;
1461 }
1462
1463 atomic_type_kind_t get_intptr_kind(void)
1464 {
1465         if (machine_size <= 32)
1466                 return ATOMIC_TYPE_INT;
1467         else if (machine_size <= 64)
1468                 return ATOMIC_TYPE_LONG;
1469         else
1470                 return ATOMIC_TYPE_LONGLONG;
1471 }
1472
1473 atomic_type_kind_t get_uintptr_kind(void)
1474 {
1475         if (machine_size <= 32)
1476                 return ATOMIC_TYPE_UINT;
1477         else if (machine_size <= 64)
1478                 return ATOMIC_TYPE_ULONG;
1479         else
1480                 return ATOMIC_TYPE_ULONGLONG;
1481 }
1482
1483 /**
1484  * Find the atomic type kind representing a given size (signed).
1485  */
1486 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size)
1487 {
1488         static atomic_type_kind_t kinds[32];
1489
1490         assert(size < 32);
1491         atomic_type_kind_t kind = kinds[size];
1492         if (kind == ATOMIC_TYPE_INVALID) {
1493                 static const atomic_type_kind_t possible_kinds[] = {
1494                         ATOMIC_TYPE_SCHAR,
1495                         ATOMIC_TYPE_SHORT,
1496                         ATOMIC_TYPE_INT,
1497                         ATOMIC_TYPE_LONG,
1498                         ATOMIC_TYPE_LONGLONG
1499                 };
1500                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1501                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1502                                 kind = possible_kinds[i];
1503                                 break;
1504                         }
1505                 }
1506                 kinds[size] = kind;
1507         }
1508         return kind;
1509 }
1510
1511 /**
1512  * Find the atomic type kind representing a given size (signed).
1513  */
1514 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size)
1515 {
1516         static atomic_type_kind_t kinds[32];
1517
1518         assert(size < 32);
1519         atomic_type_kind_t kind = kinds[size];
1520         if (kind == ATOMIC_TYPE_INVALID) {
1521                 static const atomic_type_kind_t possible_kinds[] = {
1522                         ATOMIC_TYPE_UCHAR,
1523                         ATOMIC_TYPE_USHORT,
1524                         ATOMIC_TYPE_UINT,
1525                         ATOMIC_TYPE_ULONG,
1526                         ATOMIC_TYPE_ULONGLONG
1527                 };
1528                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1529                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1530                                 kind = possible_kinds[i];
1531                                 break;
1532                         }
1533                 }
1534                 kinds[size] = kind;
1535         }
1536         return kind;
1537 }
1538
1539 /**
1540  * Hash the given type and return the "singleton" version
1541  * of it.
1542  */
1543 type_t *identify_new_type(type_t *type)
1544 {
1545         type_t *result = typehash_insert(type);
1546         if (result != type) {
1547                 obstack_free(type_obst, type);
1548         }
1549         return result;
1550 }
1551
1552 /**
1553  * Creates a new atomic type.
1554  *
1555  * @param akind       The kind of the atomic type.
1556  * @param qualifiers  Type qualifiers for the new type.
1557  */
1558 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1559 {
1560         type_t *type = obstack_alloc(type_obst, sizeof(atomic_type_t));
1561         memset(type, 0, sizeof(atomic_type_t));
1562
1563         type->kind            = TYPE_ATOMIC;
1564         type->base.qualifiers = qualifiers;
1565         type->atomic.akind    = akind;
1566
1567         return identify_new_type(type);
1568 }
1569
1570 /**
1571  * Creates a new complex type.
1572  *
1573  * @param akind       The kind of the atomic type.
1574  * @param qualifiers  Type qualifiers for the new type.
1575  */
1576 type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1577 {
1578         type_t *type = obstack_alloc(type_obst, sizeof(complex_type_t));
1579         memset(type, 0, sizeof(complex_type_t));
1580
1581         type->kind            = TYPE_COMPLEX;
1582         type->base.qualifiers = qualifiers;
1583         type->complex.akind   = akind;
1584
1585         return identify_new_type(type);
1586 }
1587
1588 /**
1589  * Creates a new imaginary type.
1590  *
1591  * @param akind       The kind of the atomic type.
1592  * @param qualifiers  Type qualifiers for the new type.
1593  */
1594 type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1595 {
1596         type_t *type = obstack_alloc(type_obst, sizeof(imaginary_type_t));
1597         memset(type, 0, sizeof(imaginary_type_t));
1598
1599         type->kind            = TYPE_IMAGINARY;
1600         type->base.qualifiers = qualifiers;
1601         type->imaginary.akind = akind;
1602
1603         return identify_new_type(type);
1604 }
1605
1606 /**
1607  * Creates a new pointer type.
1608  *
1609  * @param points_to   The points-to type for the new type.
1610  * @param qualifiers  Type qualifiers for the new type.
1611  */
1612 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1613 {
1614         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1615         memset(type, 0, sizeof(pointer_type_t));
1616
1617         type->kind                  = TYPE_POINTER;
1618         type->base.qualifiers       = qualifiers;
1619         type->pointer.points_to     = points_to;
1620         type->pointer.base_variable = NULL;
1621
1622         return identify_new_type(type);
1623 }
1624
1625 /**
1626  * Creates a new reference type.
1627  *
1628  * @param refers_to   The referred-to type for the new type.
1629  */
1630 type_t *make_reference_type(type_t *refers_to)
1631 {
1632         type_t *type = obstack_alloc(type_obst, sizeof(reference_type_t));
1633         memset(type, 0, sizeof(reference_type_t));
1634
1635         type->kind                = TYPE_REFERENCE;
1636         type->base.qualifiers     = 0;
1637         type->reference.refers_to = refers_to;
1638
1639         return identify_new_type(type);
1640 }
1641
1642 /**
1643  * Creates a new based pointer type.
1644  *
1645  * @param points_to   The points-to type for the new type.
1646  * @param qualifiers  Type qualifiers for the new type.
1647  * @param variable    The based variable
1648  */
1649 type_t *make_based_pointer_type(type_t *points_to,
1650                                                                 type_qualifiers_t qualifiers, variable_t *variable)
1651 {
1652         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1653         memset(type, 0, sizeof(pointer_type_t));
1654
1655         type->kind                  = TYPE_POINTER;
1656         type->base.qualifiers       = qualifiers;
1657         type->pointer.points_to     = points_to;
1658         type->pointer.base_variable = variable;
1659
1660         return identify_new_type(type);
1661 }
1662
1663
1664 type_t *make_array_type(type_t *element_type, size_t size,
1665                         type_qualifiers_t qualifiers)
1666 {
1667         type_t *type = obstack_alloc(type_obst, sizeof(array_type_t));
1668         memset(type, 0, sizeof(array_type_t));
1669
1670         type->kind                = TYPE_ARRAY;
1671         type->base.qualifiers     = qualifiers;
1672         type->array.element_type  = element_type;
1673         type->array.size          = size;
1674         type->array.size_constant = true;
1675
1676         return identify_new_type(type);
1677 }
1678
1679 static entity_t *pack_bitfield_members(il_size_t *struct_offset,
1680                                        il_alignment_t *struct_alignment,
1681                                                                            bool packed, entity_t *first)
1682 {
1683         il_size_t      offset     = *struct_offset;
1684         il_alignment_t alignment  = *struct_alignment;
1685         size_t         bit_offset = 0;
1686
1687         entity_t *member;
1688         for (member = first; member != NULL; member = member->base.next) {
1689                 if (member->kind != ENTITY_COMPOUND_MEMBER)
1690                         break;
1691
1692                 type_t *type = member->declaration.type;
1693                 if (type->kind != TYPE_BITFIELD)
1694                         break;
1695
1696                 type_t *base_type = skip_typeref(type->bitfield.base_type);
1697                 il_alignment_t base_alignment = get_type_alignment(base_type);
1698                 il_alignment_t alignment_mask = base_alignment-1;
1699                 if (base_alignment > alignment)
1700                         alignment = base_alignment;
1701
1702                 size_t bit_size = type->bitfield.bit_size;
1703                 if (!packed) {
1704                         bit_offset += (offset & alignment_mask) * BITS_PER_BYTE;
1705                         offset     &= ~alignment_mask;
1706                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1707
1708                         if (bit_offset + bit_size > base_size || bit_size == 0) {
1709                                 offset    += (bit_offset+BITS_PER_BYTE-1) / BITS_PER_BYTE;
1710                                 offset     = (offset + base_alignment-1) & ~alignment_mask;
1711                                 bit_offset = 0;
1712                         }
1713                 }
1714
1715                 member->compound_member.offset     = offset;
1716                 member->compound_member.bit_offset = bit_offset;
1717
1718                 bit_offset += bit_size;
1719                 offset     += bit_offset / BITS_PER_BYTE;
1720                 bit_offset %= BITS_PER_BYTE;
1721         }
1722
1723         if (bit_offset > 0)
1724                 offset += 1;
1725
1726         *struct_offset    = offset;
1727         *struct_alignment = alignment;
1728
1729         return member;
1730 }
1731
1732 /**
1733  * Finish the construction of a struct type by calculating its size, offsets,
1734  * alignment.
1735  */
1736 void layout_struct_type(compound_type_t *type)
1737 {
1738         assert(type->compound != NULL);
1739
1740         compound_t *compound = type->compound;
1741         if (!compound->complete)
1742                 return;
1743         if (type->compound->layouted)
1744                 return;
1745
1746         il_size_t      offset    = 0;
1747         il_alignment_t alignment = compound->alignment;
1748         bool           need_pad  = false;
1749
1750         entity_t *entry = compound->members.entities;
1751         while (entry != NULL) {
1752                 if (entry->kind != ENTITY_COMPOUND_MEMBER) {
1753                         entry = entry->base.next;
1754                         continue;
1755                 }
1756
1757                 type_t *m_type  = entry->declaration.type;
1758                 type_t *skipped = skip_typeref(m_type);
1759                 if (! is_type_valid(skipped)) {
1760                         entry = entry->base.next;
1761                         continue;
1762                 }
1763
1764                 if (skipped->kind == TYPE_BITFIELD) {
1765                         entry = pack_bitfield_members(&offset, &alignment,
1766                                                       compound->packed, entry);
1767                         continue;
1768                 }
1769
1770                 il_alignment_t m_alignment = get_type_alignment(m_type);
1771                 if (m_alignment > alignment)
1772                         alignment = m_alignment;
1773
1774                 if (!compound->packed) {
1775                         il_size_t new_offset = (offset + m_alignment-1) & -m_alignment;
1776
1777                         if (new_offset > offset) {
1778                                 need_pad = true;
1779                                 offset   = new_offset;
1780                         }
1781                 }
1782
1783                 entry->compound_member.offset = offset;
1784                 offset += get_type_size(m_type);
1785
1786                 entry = entry->base.next;
1787         }
1788
1789         if (!compound->packed) {
1790                 il_size_t new_offset = (offset + alignment-1) & -alignment;
1791                 if (new_offset > offset) {
1792                         need_pad = true;
1793                         offset   = new_offset;
1794                 }
1795         }
1796
1797         if (need_pad) {
1798                 if (warning.padded) {
1799                         warningf(&compound->base.source_position, "'%T' needs padding",
1800                                  type);
1801                 }
1802         } else if (compound->packed && warning.packed) {
1803                 warningf(&compound->base.source_position,
1804                          "superfluous packed attribute on '%T'", type);
1805         }
1806
1807         compound->size      = offset;
1808         compound->alignment = alignment;
1809         compound->layouted  = true;
1810 }
1811
1812 /**
1813  * Finish the construction of an union type by calculating
1814  * its size and alignment.
1815  */
1816 void layout_union_type(compound_type_t *type)
1817 {
1818         assert(type->compound != NULL);
1819
1820         compound_t *compound = type->compound;
1821         if (! compound->complete)
1822                 return;
1823
1824         il_size_t      size      = 0;
1825         il_alignment_t alignment = compound->alignment;
1826
1827         entity_t *entry = compound->members.entities;
1828         for (; entry != NULL; entry = entry->base.next) {
1829                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
1830                         continue;
1831
1832                 type_t *m_type = entry->declaration.type;
1833                 if (! is_type_valid(skip_typeref(m_type)))
1834                         continue;
1835
1836                 entry->compound_member.offset = 0;
1837                 il_size_t m_size = get_type_size(m_type);
1838                 if (m_size > size)
1839                         size = m_size;
1840                 il_alignment_t m_alignment = get_type_alignment(m_type);
1841                 if (m_alignment > alignment)
1842                         alignment = m_alignment;
1843         }
1844         size = (size + alignment - 1) & -alignment;
1845
1846         compound->size      = size;
1847         compound->alignment = alignment;
1848 }
1849
1850 /**
1851  * Debug helper. Prints the given type to stdout.
1852  */
1853 static __attribute__((unused))
1854 void dbg_type(const type_t *type)
1855 {
1856         FILE *old_out = out;
1857         out = stderr;
1858         print_type(type);
1859         puts("\n");
1860         fflush(stderr);
1861         out = old_out;
1862 }