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 typedef struct atomic_type_properties_t atomic_type_properties_t;
  47 struct atomic_type_properties_t {
  48         unsigned   size;              /**< type size in bytes */
  49         unsigned   alignment;         /**< type alignment in bytes */
  50         unsigned   flags;             /**< type flags from atomic_type_flag_t */
  51 };
  52
  53 /**
  54  * Returns the size of a type node.
  55  *
  56  * @param kind  the type kind
  57  */
  58 static size_t get_type_struct_size(type_kind_t kind)
  59 {
  60         static const size_t sizes[] = {
  61                 [TYPE_ATOMIC]          = sizeof(atomic_type_t),
  62                 [TYPE_COMPLEX]         = sizeof(complex_type_t),
  63                 [TYPE_IMAGINARY]       = sizeof(imaginary_type_t),
  64                 [TYPE_BITFIELD]        = sizeof(bitfield_type_t),
  65                 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
  66                 [TYPE_COMPOUND_UNION]  = sizeof(compound_type_t),
  67                 [TYPE_ENUM]            = sizeof(enum_type_t),
  68                 [TYPE_FUNCTION]        = sizeof(function_type_t),
  69                 [TYPE_POINTER]         = sizeof(pointer_type_t),
  70                 [TYPE_ARRAY]           = sizeof(array_type_t),
  71                 [TYPE_TYPEDEF]         = sizeof(typedef_type_t),
  72                 [TYPE_TYPEOF]          = sizeof(typeof_type_t),
  73         };
  74         assert(lengthof(sizes) == (int)TYPE_TYPEOF + 1);
  75         assert(kind <= TYPE_TYPEOF);
  76         assert(sizes[kind] != 0);
  77         return sizes[kind];
  78 }
  79
  80 type_t *allocate_type_zero(type_kind_t kind)
  81 {
  82         size_t  const size = get_type_struct_size(kind);
  83         type_t *const res  = obstack_alloc(&type_obst, size);
  84         memset(res, 0, size);
  85         res->base.kind = kind;
  86
  87         return res;
  88 }
  89
  90 /**
  91  * Properties of atomic types.
  92  */
  93 static atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
  94         //ATOMIC_TYPE_INVALID = 0,
  95         [ATOMIC_TYPE_VOID] = {
  96                 .size       = 0,
  97                 .alignment  = 0,
  98                 .flags      = ATOMIC_TYPE_FLAG_NONE
  99         },
 100         [ATOMIC_TYPE_WCHAR_T] = {
 101                 .size       = (unsigned)-1,
 102                 .alignment  = (unsigned)-1,
 103                 /* signed flag will be set when known */
 104                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 105         },
 106         [ATOMIC_TYPE_CHAR] = {
 107                 .size       = 1,
 108                 .alignment  = 1,
 109                 /* signed flag will be set when known */
 110                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 111         },
 112         [ATOMIC_TYPE_SCHAR] = {
 113                 .size       = 1,
 114                 .alignment  = 1,
 115                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 116                               | ATOMIC_TYPE_FLAG_SIGNED,
 117         },
 118         [ATOMIC_TYPE_UCHAR] = {
 119                 .size       = 1,
 120                 .alignment  = 1,
 121                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 122         },
 123         [ATOMIC_TYPE_SHORT] = {
 124                 .size       = 2,
 125                 .alignment  = 2,
 126                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 127                               | ATOMIC_TYPE_FLAG_SIGNED
 128         },
 129         [ATOMIC_TYPE_USHORT] = {
 130                 .size       = 2,
 131                 .alignment  = 2,
 132                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 133         },
 134         [ATOMIC_TYPE_INT] = {
 135                 .size       = (unsigned) -1,
 136                 .alignment  = (unsigned) -1,
 137                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 138                               | ATOMIC_TYPE_FLAG_SIGNED,
 139         },
 140         [ATOMIC_TYPE_UINT] = {
 141                 .size       = (unsigned) -1,
 142                 .alignment  = (unsigned) -1,
 143                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 144         },
 145         [ATOMIC_TYPE_LONG] = {
 146                 .size       = (unsigned) -1,
 147                 .alignment  = (unsigned) -1,
 148                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 149                               | ATOMIC_TYPE_FLAG_SIGNED,
 150         },
 151         [ATOMIC_TYPE_ULONG] = {
 152                 .size       = (unsigned) -1,
 153                 .alignment  = (unsigned) -1,
 154                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 155         },
 156         [ATOMIC_TYPE_LONGLONG] = {
 157                 .size       = (unsigned) -1,
 158                 .alignment  = (unsigned) -1,
 159                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 160                               | ATOMIC_TYPE_FLAG_SIGNED,
 161         },
 162         [ATOMIC_TYPE_ULONGLONG] = {
 163                 .size       = (unsigned) -1,
 164                 .alignment  = (unsigned) -1,
 165                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 166         },
 167         [ATOMIC_TYPE_BOOL] = {
 168                 .size       = (unsigned) -1,
 169                 .alignment  = (unsigned) -1,
 170                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 171         },
 172         [ATOMIC_TYPE_FLOAT] = {
 173                 .size       = 4,
 174                 .alignment  = (unsigned) -1,
 175                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 176                               | ATOMIC_TYPE_FLAG_SIGNED,
 177         },
 178         [ATOMIC_TYPE_DOUBLE] = {
 179                 .size       = 8,
 180                 .alignment  = (unsigned) -1,
 181                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 182                               | ATOMIC_TYPE_FLAG_SIGNED,
 183         },
 184         [ATOMIC_TYPE_LONG_DOUBLE] = {
 185                 .size       = (unsigned) -1, /* will be filled in later */
 186                 .alignment  = (unsigned) -1,
 187                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 188                               | ATOMIC_TYPE_FLAG_SIGNED,
 189         },
 190         /* complex and imaginary types are set in init_types */
 191 };
 192
 193 static inline bool is_po2(unsigned x)
 194 {
 195         return (x & (x-1)) == 0;
 196 }
 197
 198 void init_types(void)
 199 {
 200         obstack_init(&type_obst);
 201
 202         atomic_type_properties_t *props = atomic_type_properties;
 203
 204         if (char_is_signed) {
 205                 props[ATOMIC_TYPE_CHAR].flags |= ATOMIC_TYPE_FLAG_SIGNED;
 206         }
 207
 208         unsigned int_size   = machine_size < 32 ? 2 : 4;
 209         /* long is always 32bit on windows */
 210         unsigned long_size  = c_mode & _MS ? 4 : (machine_size < 64 ? 4 : 8);
 211         unsigned llong_size = machine_size < 32 ? 4 : 8;
 212
 213         props[ATOMIC_TYPE_INT].size            = int_size;
 214         props[ATOMIC_TYPE_INT].alignment       = int_size;
 215         props[ATOMIC_TYPE_UINT].size           = int_size;
 216         props[ATOMIC_TYPE_UINT].alignment      = int_size;
 217         props[ATOMIC_TYPE_LONG].size           = long_size;
 218         props[ATOMIC_TYPE_LONG].alignment      = long_size;
 219         props[ATOMIC_TYPE_ULONG].size          = long_size;
 220         props[ATOMIC_TYPE_ULONG].alignment     = long_size;
 221         props[ATOMIC_TYPE_LONGLONG].size       = llong_size;
 222         props[ATOMIC_TYPE_LONGLONG].alignment  = llong_size;
 223         props[ATOMIC_TYPE_ULONGLONG].size      = llong_size;
 224         props[ATOMIC_TYPE_ULONGLONG].alignment = llong_size;
 225
 226         /* TODO: backend specific, need a way to query the backend for this.
 227          * The following are good settings for x86 */
 228         if (machine_size <= 32) {
 229                 props[ATOMIC_TYPE_FLOAT].alignment       = 4;
 230                 props[ATOMIC_TYPE_DOUBLE].alignment      = 4;
 231                 props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 4;
 232                 props[ATOMIC_TYPE_LONGLONG].alignment    = 4;
 233                 props[ATOMIC_TYPE_ULONGLONG].alignment   = 4;
 234         } else {
 235                 props[ATOMIC_TYPE_FLOAT].alignment       = 4;
 236                 props[ATOMIC_TYPE_DOUBLE].alignment      = 8;
 237                 props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 8;
 238                 props[ATOMIC_TYPE_LONGLONG].alignment    = 8;
 239                 props[ATOMIC_TYPE_ULONGLONG].alignment   = 8;
 240         }
 241
 242         if (long_double_size > 0) {
 243                 props[ATOMIC_TYPE_LONG_DOUBLE].size      = long_double_size;
 244                 if (is_po2(long_double_size)) {
 245                         props[ATOMIC_TYPE_LONG_DOUBLE].alignment = long_double_size;
 246                 }
 247         } else {
 248                 props[ATOMIC_TYPE_LONG_DOUBLE] = props[ATOMIC_TYPE_DOUBLE];
 249         }
 250
 251         /* TODO: make this configurable for platforms which do not use byte sized
 252          * bools. */
 253         props[ATOMIC_TYPE_BOOL] = props[ATOMIC_TYPE_UCHAR];
 254
 255         props[ATOMIC_TYPE_WCHAR_T] = props[wchar_atomic_kind];
 256 }
 257
 258 void exit_types(void)
 259 {
 260         obstack_free(&type_obst, NULL);
 261 }
 262
 263 void print_type_qualifiers(type_qualifiers_t const qualifiers, QualifierSeparators const q)
 264 {
 265         size_t sep = q & QUAL_SEP_START ? 0 : 1;
 266         if (qualifiers & TYPE_QUALIFIER_CONST) {
 267                 print_string(" const" + sep);
 268                 sep = 0;
 269         }
 270         if (qualifiers & TYPE_QUALIFIER_VOLATILE) {
 271                 print_string(" volatile" + sep);
 272                 sep = 0;
 273         }
 274         if (qualifiers & TYPE_QUALIFIER_RESTRICT) {
 275                 print_string(" restrict" + sep);
 276                 sep = 0;
 277         }
 278         if (sep == 0 && q & QUAL_SEP_END)
 279                 print_char(' ');
 280 }
 281
 282 const char *get_atomic_kind_name(atomic_type_kind_t kind)
 283 {
 284         switch(kind) {
 285         case ATOMIC_TYPE_INVALID: break;
 286         case ATOMIC_TYPE_VOID:        return "void";
 287         case ATOMIC_TYPE_WCHAR_T:     return "wchar_t";
 288         case ATOMIC_TYPE_BOOL:        return c_mode & _CXX ? "bool" : "_Bool";
 289         case ATOMIC_TYPE_CHAR:        return "char";
 290         case ATOMIC_TYPE_SCHAR:       return "signed char";
 291         case ATOMIC_TYPE_UCHAR:       return "unsigned char";
 292         case ATOMIC_TYPE_INT:         return "int";
 293         case ATOMIC_TYPE_UINT:        return "unsigned int";
 294         case ATOMIC_TYPE_SHORT:       return "short";
 295         case ATOMIC_TYPE_USHORT:      return "unsigned short";
 296         case ATOMIC_TYPE_LONG:        return "long";
 297         case ATOMIC_TYPE_ULONG:       return "unsigned long";
 298         case ATOMIC_TYPE_LONGLONG:    return "long long";
 299         case ATOMIC_TYPE_ULONGLONG:   return "unsigned long long";
 300         case ATOMIC_TYPE_LONG_DOUBLE: return "long double";
 301         case ATOMIC_TYPE_FLOAT:       return "float";
 302         case ATOMIC_TYPE_DOUBLE:      return "double";
 303         }
 304         return "INVALIDATOMIC";
 305 }
 306
 307 /**
 308  * Prints the name of an atomic type kinds.
 309  *
 310  * @param kind  The type kind.
 311  */
 312 static void print_atomic_kinds(atomic_type_kind_t kind)
 313 {
 314         const char *s = get_atomic_kind_name(kind);
 315         print_string(s);
 316 }
 317
 318 /**
 319  * Prints the name of an atomic type.
 320  *
 321  * @param type  The type.
 322  */
 323 static void print_atomic_type(const atomic_type_t *type)
 324 {
 325         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 326         print_atomic_kinds(type->akind);
 327 }
 328
 329 /**
 330  * Prints the name of a complex type.
 331  *
 332  * @param type  The type.
 333  */
 334 static void print_complex_type(const complex_type_t *type)
 335 {
 336         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 337         print_string("_Complex");
 338         print_atomic_kinds(type->akind);
 339 }
 340
 341 /**
 342  * Prints the name of an imaginary type.
 343  *
 344  * @param type  The type.
 345  */
 346 static void print_imaginary_type(const imaginary_type_t *type)
 347 {
 348         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 349         print_string("_Imaginary ");
 350         print_atomic_kinds(type->akind);
 351 }
 352
 353 /**
 354  * Print the first part (the prefix) of a type.
 355  *
 356  * @param type   The type to print.
 357  */
 358 static void print_function_type_pre(const function_type_t *type)
 359 {
 360         switch (type->linkage) {
 361                 case LINKAGE_INVALID:
 362                         break;
 363
 364                 case LINKAGE_C:
 365                         if (c_mode & _CXX)
 366                                 print_string("extern \"C\" ");
 367                         break;
 368
 369                 case LINKAGE_CXX:
 370                         if (!(c_mode & _CXX))
 371                                 print_string("extern \"C++\" ");
 372                         break;
 373         }
 374
 375         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 376
 377         intern_print_type_pre(type->return_type);
 378
 379         cc_kind_t cc = type->calling_convention;
 380 restart:
 381         switch (cc) {
 382         case CC_CDECL:    print_string(" __cdecl");    break;
 383         case CC_STDCALL:  print_string(" __stdcall");  break;
 384         case CC_FASTCALL: print_string(" __fastcall"); break;
 385         case CC_THISCALL: print_string(" __thiscall"); break;
 386         case CC_DEFAULT:
 387                 if (default_calling_convention != CC_CDECL) {
 388                         /* show the default calling convention if its not cdecl */
 389                         cc = default_calling_convention;
 390                         goto restart;
 391                 }
 392                 break;
 393         }
 394 }
 395
 396 /**
 397  * Print the second part (the postfix) of a type.
 398  *
 399  * @param type   The type to print.
 400  */
 401 static void print_function_type_post(const function_type_t *type,
 402                                      const scope_t *parameters)
 403 {
 404         print_string("(");
 405         bool first = true;
 406         if (parameters == NULL) {
 407                 function_parameter_t *parameter = type->parameters;
 408                 for( ; parameter != NULL; parameter = parameter->next) {
 409                         if (first) {
 410                                 first = false;
 411                         } else {
 412                                 print_string(", ");
 413                         }
 414                         print_type(parameter->type);
 415                 }
 416         } else {
 417                 entity_t *parameter = parameters->entities;
 418                 for (; parameter != NULL; parameter = parameter->base.next) {
 419                         if (parameter->kind != ENTITY_PARAMETER)
 420                                 continue;
 421
 422                         if (first) {
 423                                 first = false;
 424                         } else {
 425                                 print_string(", ");
 426                         }
 427                         const type_t *const param_type = parameter->declaration.type;
 428                         if (param_type == NULL) {
 429                                 print_string(parameter->base.symbol->string);
 430                         } else {
 431                                 print_type_ext(param_type, parameter->base.symbol, NULL);
 432                         }
 433                 }
 434         }
 435         if (type->variadic) {
 436                 if (first) {
 437                         first = false;
 438                 } else {
 439                         print_string(", ");
 440                 }
 441                 print_string("...");
 442         }
 443         if (first && !type->unspecified_parameters) {
 444                 print_string("void");
 445         }
 446         print_string(")");
 447
 448         intern_print_type_post(type->return_type);
 449 }
 450
 451 /**
 452  * Prints the prefix part of a pointer type.
 453  *
 454  * @param type   The pointer type.
 455  */
 456 static void print_pointer_type_pre(const pointer_type_t *type)
 457 {
 458         type_t const *const points_to = type->points_to;
 459         intern_print_type_pre(points_to);
 460         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 461                 print_string(" (");
 462         variable_t *const variable = type->base_variable;
 463         if (variable != NULL) {
 464                 print_string(" __based(");
 465                 print_string(variable->base.base.symbol->string);
 466                 print_string(") ");
 467         }
 468         print_string("*");
 469         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_START);
 470 }
 471
 472 /**
 473  * Prints the postfix part of a pointer type.
 474  *
 475  * @param type   The pointer type.
 476  */
 477 static void print_pointer_type_post(const pointer_type_t *type)
 478 {
 479         type_t const *const points_to = type->points_to;
 480         if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
 481                 print_string(")");
 482         intern_print_type_post(points_to);
 483 }
 484
 485 /**
 486  * Prints the prefix part of a reference type.
 487  *
 488  * @param type   The reference type.
 489  */
 490 static void print_reference_type_pre(const reference_type_t *type)
 491 {
 492         type_t const *const refers_to = type->refers_to;
 493         intern_print_type_pre(refers_to);
 494         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 495                 print_string(" (");
 496         print_string("&");
 497 }
 498
 499 /**
 500  * Prints the postfix part of a reference type.
 501  *
 502  * @param type   The reference type.
 503  */
 504 static void print_reference_type_post(const reference_type_t *type)
 505 {
 506         type_t const *const refers_to = type->refers_to;
 507         if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
 508                 print_string(")");
 509         intern_print_type_post(refers_to);
 510 }
 511
 512 /**
 513  * Prints the prefix part of an array type.
 514  *
 515  * @param type   The array type.
 516  */
 517 static void print_array_type_pre(const array_type_t *type)
 518 {
 519         intern_print_type_pre(type->element_type);
 520 }
 521
 522 /**
 523  * Prints the postfix part of an array type.
 524  *
 525  * @param type   The array type.
 526  */
 527 static void print_array_type_post(const array_type_t *type)
 528 {
 529         print_string("[");
 530         if (type->is_static) {
 531                 print_string("static ");
 532         }
 533         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 534         if (type->size_expression != NULL
 535                         && (print_implicit_array_size || !type->has_implicit_size)) {
 536                 print_expression(type->size_expression);
 537         }
 538         print_string("]");
 539         intern_print_type_post(type->element_type);
 540 }
 541
 542 /**
 543  * Prints the postfix part of a bitfield type.
 544  *
 545  * @param type   The array type.
 546  */
 547 static void print_bitfield_type_post(const bitfield_type_t *type)
 548 {
 549         print_string(" : ");
 550         print_expression(type->size_expression);
 551         intern_print_type_post(type->base_type);
 552 }
 553
 554 /**
 555  * Prints an enum definition.
 556  *
 557  * @param declaration  The enum's type declaration.
 558  */
 559 void print_enum_definition(const enum_t *enume)
 560 {
 561         print_string("{\n");
 562
 563         change_indent(1);
 564
 565         entity_t *entry = enume->base.next;
 566         for( ; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
 567                entry = entry->base.next) {
 568
 569                 print_indent();
 570                 print_string(entry->base.symbol->string);
 571                 if (entry->enum_value.value != NULL) {
 572                         print_string(" = ");
 573
 574                         /* skip the implicit cast */
 575                         expression_t *expression = entry->enum_value.value;
 576                         if (expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
 577                                 expression = expression->unary.value;
 578                         }
 579                         print_expression(expression);
 580                 }
 581                 print_string(",\n");
 582         }
 583
 584         change_indent(-1);
 585         print_indent();
 586         print_string("}");
 587 }
 588
 589 /**
 590  * Prints an enum type.
 591  *
 592  * @param type  The enum type.
 593  */
 594 static void print_type_enum(const enum_type_t *type)
 595 {
 596         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 597         print_string("enum ");
 598
 599         enum_t   *enume  = type->enume;
 600         symbol_t *symbol = enume->base.symbol;
 601         if (symbol != NULL) {
 602                 print_string(symbol->string);
 603         } else {
 604                 print_enum_definition(enume);
 605         }
 606 }
 607
 608 /**
 609  * Print the compound part of a compound type.
 610  */
 611 void print_compound_definition(const compound_t *compound)
 612 {
 613         print_string("{\n");
 614         change_indent(1);
 615
 616         entity_t *entity = compound->members.entities;
 617         for( ; entity != NULL; entity = entity->base.next) {
 618                 if (entity->kind != ENTITY_COMPOUND_MEMBER)
 619                         continue;
 620
 621                 print_indent();
 622                 print_entity(entity);
 623                 print_string("\n");
 624         }
 625
 626         change_indent(-1);
 627         print_indent();
 628         print_string("}");
 629         if (compound->modifiers & DM_TRANSPARENT_UNION) {
 630                 print_string("__attribute__((__transparent_union__))");
 631         }
 632 }
 633
 634 /**
 635  * Prints a compound type.
 636  *
 637  * @param type  The compound type.
 638  */
 639 static void print_compound_type(const compound_type_t *type)
 640 {
 641         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 642
 643         if (type->base.kind == TYPE_COMPOUND_STRUCT) {
 644                 print_string("struct ");
 645         } else {
 646                 assert(type->base.kind == TYPE_COMPOUND_UNION);
 647                 print_string("union ");
 648         }
 649
 650         compound_t *compound = type->compound;
 651         symbol_t   *symbol   = compound->base.symbol;
 652         if (symbol != NULL) {
 653                 print_string(symbol->string);
 654         } else {
 655                 print_compound_definition(compound);
 656         }
 657 }
 658
 659 /**
 660  * Prints the prefix part of a typedef type.
 661  *
 662  * @param type   The typedef type.
 663  */
 664 static void print_typedef_type_pre(const typedef_type_t *const type)
 665 {
 666         print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
 667         print_string(type->typedefe->base.symbol->string);
 668 }
 669
 670 /**
 671  * Prints the prefix part of a typeof type.
 672  *
 673  * @param type   The typeof type.
 674  */
 675 static void print_typeof_type_pre(const typeof_type_t *const type)
 676 {
 677         print_string("typeof(");
 678         if (type->expression != NULL) {
 679                 print_expression(type->expression);
 680         } else {
 681                 print_type(type->typeof_type);
 682         }
 683         print_string(")");
 684 }
 685
 686 /**
 687  * Prints the prefix part of a type.
 688  *
 689  * @param type   The type.
 690  */
 691 static void intern_print_type_pre(const type_t *const type)
 692 {
 693         switch(type->kind) {
 694         case TYPE_ERROR:
 695                 print_string("<error>");
 696                 return;
 697         case TYPE_INVALID:
 698                 print_string("<invalid>");
 699                 return;
 700         case TYPE_ENUM:
 701                 print_type_enum(&type->enumt);
 702                 return;
 703         case TYPE_ATOMIC:
 704                 print_atomic_type(&type->atomic);
 705                 return;
 706         case TYPE_COMPLEX:
 707                 print_complex_type(&type->complex);
 708                 return;
 709         case TYPE_IMAGINARY:
 710                 print_imaginary_type(&type->imaginary);
 711                 return;
 712         case TYPE_COMPOUND_STRUCT:
 713         case TYPE_COMPOUND_UNION:
 714                 print_compound_type(&type->compound);
 715                 return;
 716         case TYPE_FUNCTION:
 717                 print_function_type_pre(&type->function);
 718                 return;
 719         case TYPE_POINTER:
 720                 print_pointer_type_pre(&type->pointer);
 721                 return;
 722         case TYPE_REFERENCE:
 723                 print_reference_type_pre(&type->reference);
 724                 return;
 725         case TYPE_BITFIELD:
 726                 intern_print_type_pre(type->bitfield.base_type);
 727                 return;
 728         case TYPE_ARRAY:
 729                 print_array_type_pre(&type->array);
 730                 return;
 731         case TYPE_TYPEDEF:
 732                 print_typedef_type_pre(&type->typedeft);
 733                 return;
 734         case TYPE_TYPEOF:
 735                 print_typeof_type_pre(&type->typeoft);
 736                 return;
 737         }
 738         print_string("unknown");
 739 }
 740
 741 /**
 742  * Prints the postfix part of a type.
 743  *
 744  * @param type   The type.
 745  */
 746 static void intern_print_type_post(const type_t *const type)
 747 {
 748         switch(type->kind) {
 749         case TYPE_FUNCTION:
 750                 print_function_type_post(&type->function, NULL);
 751                 return;
 752         case TYPE_POINTER:
 753                 print_pointer_type_post(&type->pointer);
 754                 return;
 755         case TYPE_REFERENCE:
 756                 print_reference_type_post(&type->reference);
 757                 return;
 758         case TYPE_ARRAY:
 759                 print_array_type_post(&type->array);
 760                 return;
 761         case TYPE_BITFIELD:
 762                 print_bitfield_type_post(&type->bitfield);
 763                 return;
 764         case TYPE_ERROR:
 765         case TYPE_INVALID:
 766         case TYPE_ATOMIC:
 767         case TYPE_COMPLEX:
 768         case TYPE_IMAGINARY:
 769         case TYPE_ENUM:
 770         case TYPE_COMPOUND_STRUCT:
 771         case TYPE_COMPOUND_UNION:
 772         case TYPE_TYPEOF:
 773         case TYPE_TYPEDEF:
 774                 break;
 775         }
 776 }
 777
 778 /**
 779  * Prints a type.
 780  *
 781  * @param type   The type.
 782  */
 783 void print_type(const type_t *const type)
 784 {
 785         print_type_ext(type, NULL, NULL);
 786 }
 787
 788 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 789                     const scope_t *parameters)
 790 {
 791         intern_print_type_pre(type);
 792         if (symbol != NULL) {
 793                 print_string(" ");
 794                 print_string(symbol->string);
 795         }
 796         if (type->kind == TYPE_FUNCTION) {
 797                 print_function_type_post(&type->function, parameters);
 798         } else {
 799                 intern_print_type_post(type);
 800         }
 801 }
 802
 803 /**
 804  * Duplicates a type.
 805  *
 806  * @param type  The type to copy.
 807  * @return A copy of the type.
 808  *
 809  * @note This does not produce a deep copy!
 810  */
 811 type_t *duplicate_type(const type_t *type)
 812 {
 813         size_t size = get_type_struct_size(type->kind);
 814
 815         type_t *const copy = obstack_alloc(&type_obst, size);
 816         memcpy(copy, type, size);
 817         copy->base.firm_type = NULL;
 818
 819         return copy;
 820 }
 821
 822 /**
 823  * Returns the unqualified type of a given type.
 824  *
 825  * @param type  The type.
 826  * @returns The unqualified type.
 827  */
 828 type_t *get_unqualified_type(type_t *type)
 829 {
 830         assert(!is_typeref(type));
 831
 832         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 833                 return type;
 834
 835         type_t *unqualified_type          = duplicate_type(type);
 836         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 837
 838         return identify_new_type(unqualified_type);
 839 }
 840
 841 type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual)
 842 {
 843         type_t *type = skip_typeref(orig_type);
 844
 845         type_t *copy;
 846         if (is_type_array(type)) {
 847                 /* For array types the element type has to be adjusted */
 848                 type_t *element_type      = type->array.element_type;
 849                 type_t *qual_element_type = get_qualified_type(element_type, qual);
 850
 851                 if (qual_element_type == element_type)
 852                         return orig_type;
 853
 854                 copy                     = duplicate_type(type);
 855                 copy->array.element_type = qual_element_type;
 856         } else if (is_type_valid(type)) {
 857                 if ((type->base.qualifiers & qual) == (int)qual)
 858                         return orig_type;
 859
 860                 copy                   = duplicate_type(type);
 861                 copy->base.qualifiers |= qual;
 862         } else {
 863                 return type;
 864         }
 865
 866         return identify_new_type(copy);
 867 }
 868
 869 /**
 870  * Check if a type is valid.
 871  *
 872  * @param type  The type to check.
 873  * @return true if type represents a valid type.
 874  */
 875 bool type_valid(const type_t *type)
 876 {
 877         return type->kind != TYPE_INVALID;
 878 }
 879
 880 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 881                                   atomic_type_flag_t flag)
 882 {
 883         assert(kind <= ATOMIC_TYPE_LAST);
 884         return (atomic_type_properties[kind].flags & flag) != 0;
 885 }
 886
 887 /**
 888  * Returns true if the given type is an integer type.
 889  *
 890  * @param type  The type to check.
 891  * @return True if type is an integer type.
 892  */
 893 bool is_type_integer(const type_t *type)
 894 {
 895         assert(!is_typeref(type));
 896
 897         if (type->kind == TYPE_ENUM)
 898                 return true;
 899         if (type->kind == TYPE_BITFIELD)
 900                 return true;
 901
 902         if (type->kind != TYPE_ATOMIC)
 903                 return false;
 904
 905         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 906 }
 907
 908 /**
 909  * Returns true if the given type is an enum type.
 910  *
 911  * @param type  The type to check.
 912  * @return True if type is an enum type.
 913  */
 914 bool is_type_enum(const type_t *type)
 915 {
 916         assert(!is_typeref(type));
 917         return type->kind == TYPE_ENUM;
 918 }
 919
 920 /**
 921  * Returns true if the given type is an floating point type.
 922  *
 923  * @param type  The type to check.
 924  * @return True if type is a floating point type.
 925  */
 926 bool is_type_float(const type_t *type)
 927 {
 928         assert(!is_typeref(type));
 929
 930         if (type->kind != TYPE_ATOMIC)
 931                 return false;
 932
 933         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 934 }
 935
 936 /**
 937  * Returns true if the given type is an complex type.
 938  *
 939  * @param type  The type to check.
 940  * @return True if type is a complex type.
 941  */
 942 bool is_type_complex(const type_t *type)
 943 {
 944         assert(!is_typeref(type));
 945
 946         if (type->kind != TYPE_ATOMIC)
 947                 return false;
 948
 949         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_COMPLEX);
 950 }
 951
 952 /**
 953  * Returns true if the given type is a signed type.
 954  *
 955  * @param type  The type to check.
 956  * @return True if type is a signed type.
 957  */
 958 bool is_type_signed(const type_t *type)
 959 {
 960         assert(!is_typeref(type));
 961
 962         /* enum types are int for now */
 963         if (type->kind == TYPE_ENUM)
 964                 return true;
 965         if (type->kind == TYPE_BITFIELD)
 966                 return is_type_signed(type->bitfield.base_type);
 967
 968         if (type->kind != TYPE_ATOMIC)
 969                 return false;
 970
 971         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 972 }
 973
 974 /**
 975  * Returns true if the given type represents an arithmetic type.
 976  *
 977  * @param type  The type to check.
 978  * @return True if type represents an arithmetic type.
 979  */
 980 bool is_type_arithmetic(const type_t *type)
 981 {
 982         assert(!is_typeref(type));
 983
 984         switch(type->kind) {
 985         case TYPE_BITFIELD:
 986         case TYPE_ENUM:
 987                 return true;
 988         case TYPE_ATOMIC:
 989                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 990         case TYPE_COMPLEX:
 991                 return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 992         case TYPE_IMAGINARY:
 993                 return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 994         default:
 995                 return false;
 996         }
 997 }
 998
 999 /**
1000  * Returns true if the given type is an integer or float type.
1001  *
1002  * @param type  The type to check.
1003  * @return True if type is an integer or float type.
1004  */
1005 bool is_type_real(const type_t *type)
1006 {
1007         /* 6.2.5 (17) */
1008         return is_type_integer(type) || is_type_float(type);
1009 }
1010
1011 /**
1012  * Returns true if the given type represents a scalar type.
1013  *
1014  * @param type  The type to check.
1015  * @return True if type represents a scalar type.
1016  */
1017 bool is_type_scalar(const type_t *type)
1018 {
1019         assert(!is_typeref(type));
1020
1021         if (type->kind == TYPE_POINTER)
1022                 return true;
1023
1024         return is_type_arithmetic(type);
1025 }
1026
1027 /**
1028  * Check if a given type is incomplete.
1029  *
1030  * @param type  The type to check.
1031  * @return True if the given type is incomplete (ie. just forward).
1032  */
1033 bool is_type_incomplete(const type_t *type)
1034 {
1035         assert(!is_typeref(type));
1036
1037         switch(type->kind) {
1038         case TYPE_COMPOUND_STRUCT:
1039         case TYPE_COMPOUND_UNION: {
1040                 const compound_type_t *compound_type = &type->compound;
1041                 return !compound_type->compound->complete;
1042         }
1043         case TYPE_ENUM:
1044                 return false;
1045
1046         case TYPE_ARRAY:
1047                 return type->array.size_expression == NULL
1048                         && !type->array.size_constant;
1049
1050         case TYPE_ATOMIC:
1051                 return type->atomic.akind == ATOMIC_TYPE_VOID;
1052
1053         case TYPE_COMPLEX:
1054                 return type->complex.akind == ATOMIC_TYPE_VOID;
1055
1056         case TYPE_IMAGINARY:
1057                 return type->imaginary.akind == ATOMIC_TYPE_VOID;
1058
1059         case TYPE_BITFIELD:
1060         case TYPE_FUNCTION:
1061         case TYPE_POINTER:
1062         case TYPE_REFERENCE:
1063         case TYPE_ERROR:
1064                 return false;
1065
1066         case TYPE_TYPEDEF:
1067         case TYPE_TYPEOF:
1068                 panic("is_type_incomplete called without typerefs skipped");
1069         case TYPE_INVALID:
1070                 break;
1071         }
1072
1073         panic("invalid type found");
1074 }
1075
1076 bool is_type_object(const type_t *type)
1077 {
1078         return !is_type_function(type) && !is_type_incomplete(type);
1079 }
1080
1081 /**
1082  * Check if two function types are compatible.
1083  */
1084 static bool function_types_compatible(const function_type_t *func1,
1085                                       const function_type_t *func2)
1086 {
1087         const type_t* const ret1 = skip_typeref(func1->return_type);
1088         const type_t* const ret2 = skip_typeref(func2->return_type);
1089         if (!types_compatible(ret1, ret2))
1090                 return false;
1091
1092         if (func1->linkage != func2->linkage)
1093                 return false;
1094
1095         cc_kind_t cc1 = func1->calling_convention;
1096         if (cc1 == CC_DEFAULT)
1097                 cc1 = default_calling_convention;
1098         cc_kind_t cc2 = func2->calling_convention;
1099         if (cc2 == CC_DEFAULT)
1100                 cc2 = default_calling_convention;
1101
1102         if (cc1 != cc2)
1103                 return false;
1104
1105         if (func1->variadic != func2->variadic)
1106                 return false;
1107
1108         /* can parameters be compared? */
1109         if ((func1->unspecified_parameters && !func1->kr_style_parameters)
1110                         || (func2->unspecified_parameters && !func2->kr_style_parameters))
1111                 return true;
1112
1113         /* TODO: handling of unspecified parameters not correct yet */
1114
1115         /* all argument types must be compatible */
1116         function_parameter_t *parameter1 = func1->parameters;
1117         function_parameter_t *parameter2 = func2->parameters;
1118         for ( ; parameter1 != NULL && parameter2 != NULL;
1119                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
1120                 type_t *parameter1_type = skip_typeref(parameter1->type);
1121                 type_t *parameter2_type = skip_typeref(parameter2->type);
1122
1123                 parameter1_type = get_unqualified_type(parameter1_type);
1124                 parameter2_type = get_unqualified_type(parameter2_type);
1125
1126                 if (!types_compatible(parameter1_type, parameter2_type))
1127                         return false;
1128         }
1129         /* same number of arguments? */
1130         if (parameter1 != NULL || parameter2 != NULL)
1131                 return false;
1132
1133         return true;
1134 }
1135
1136 /**
1137  * Check if two array types are compatible.
1138  */
1139 static bool array_types_compatible(const array_type_t *array1,
1140                                    const array_type_t *array2)
1141 {
1142         type_t *element_type1 = skip_typeref(array1->element_type);
1143         type_t *element_type2 = skip_typeref(array2->element_type);
1144         if (!types_compatible(element_type1, element_type2))
1145                 return false;
1146
1147         if (!array1->size_constant || !array2->size_constant)
1148                 return true;
1149
1150         return array1->size == array2->size;
1151 }
1152
1153 /**
1154  * Check if two types are compatible.
1155  */
1156 bool types_compatible(const type_t *type1, const type_t *type2)
1157 {
1158         assert(!is_typeref(type1));
1159         assert(!is_typeref(type2));
1160
1161         /* shortcut: the same type is always compatible */
1162         if (type1 == type2)
1163                 return true;
1164
1165         if (!is_type_valid(type1) || !is_type_valid(type2))
1166                 return true;
1167
1168         if (type1->base.qualifiers != type2->base.qualifiers)
1169                 return false;
1170         if (type1->kind != type2->kind)
1171                 return false;
1172
1173         switch (type1->kind) {
1174         case TYPE_FUNCTION:
1175                 return function_types_compatible(&type1->function, &type2->function);
1176         case TYPE_ATOMIC:
1177                 return type1->atomic.akind == type2->atomic.akind;
1178         case TYPE_COMPLEX:
1179                 return type1->complex.akind == type2->complex.akind;
1180         case TYPE_IMAGINARY:
1181                 return type1->imaginary.akind == type2->imaginary.akind;
1182         case TYPE_ARRAY:
1183                 return array_types_compatible(&type1->array, &type2->array);
1184
1185         case TYPE_POINTER: {
1186                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
1187                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
1188                 return types_compatible(to1, to2);
1189         }
1190
1191         case TYPE_REFERENCE: {
1192                 const type_t *const to1 = skip_typeref(type1->reference.refers_to);
1193                 const type_t *const to2 = skip_typeref(type2->reference.refers_to);
1194                 return types_compatible(to1, to2);
1195         }
1196
1197         case TYPE_COMPOUND_STRUCT:
1198         case TYPE_COMPOUND_UNION: {
1199
1200
1201                 break;
1202         }
1203         case TYPE_ENUM:
1204                 /* TODO: not implemented */
1205                 break;
1206
1207         case TYPE_BITFIELD:
1208                 /* not sure if this makes sense or is even needed, implement it if you
1209                  * really need it! */
1210                 panic("type compatibility check for bitfield type");
1211
1212         case TYPE_ERROR:
1213                 /* Hmm, the error type should be compatible to all other types */
1214                 return true;
1215         case TYPE_INVALID:
1216                 panic("invalid type found in compatible types");
1217         case TYPE_TYPEDEF:
1218         case TYPE_TYPEOF:
1219                 panic("typerefs not skipped in compatible types?!?");
1220         }
1221
1222         /* TODO: incomplete */
1223         return false;
1224 }
1225
1226 /**
1227  * Skip all typerefs and return the underlying type.
1228  */
1229 type_t *skip_typeref(type_t *type)
1230 {
1231         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1232
1233         while (true) {
1234                 switch (type->kind) {
1235                 case TYPE_ERROR:
1236                         return type;
1237                 case TYPE_TYPEDEF: {
1238                         qualifiers |= type->base.qualifiers;
1239
1240                         const typedef_type_t *typedef_type = &type->typedeft;
1241                         if (typedef_type->resolved_type != NULL) {
1242                                 type = typedef_type->resolved_type;
1243                                 break;
1244                         }
1245                         type = typedef_type->typedefe->type;
1246                         continue;
1247                 }
1248                 case TYPE_TYPEOF:
1249                         qualifiers |= type->base.qualifiers;
1250                         type        = type->typeoft.typeof_type;
1251                         continue;
1252                 default:
1253                         break;
1254                 }
1255                 break;
1256         }
1257
1258         if (qualifiers != TYPE_QUALIFIER_NONE) {
1259                 type_t *const copy = duplicate_type(type);
1260
1261                 /* for const with typedefed array type the element type has to be
1262                  * adjusted */
1263                 if (is_type_array(copy)) {
1264                         type_t *element_type           = copy->array.element_type;
1265                         element_type                   = duplicate_type(element_type);
1266                         element_type->base.qualifiers |= qualifiers;
1267                         copy->array.element_type       = element_type;
1268                 } else {
1269                         copy->base.qualifiers |= qualifiers;
1270                 }
1271
1272                 type = identify_new_type(copy);
1273         }
1274
1275         return type;
1276 }
1277
1278 unsigned get_type_size(type_t *type)
1279 {
1280         switch (type->kind) {
1281         case TYPE_INVALID:
1282                 break;
1283         case TYPE_ERROR:
1284                 return 0;
1285         case TYPE_ATOMIC:
1286                 return get_atomic_type_size(type->atomic.akind);
1287         case TYPE_COMPLEX:
1288                 return get_atomic_type_size(type->complex.akind) * 2;
1289         case TYPE_IMAGINARY:
1290                 return get_atomic_type_size(type->imaginary.akind);
1291         case TYPE_COMPOUND_UNION:
1292                 layout_union_type(&type->compound);
1293                 return type->compound.compound->size;
1294         case TYPE_COMPOUND_STRUCT:
1295                 layout_struct_type(&type->compound);
1296                 return type->compound.compound->size;
1297         case TYPE_ENUM:
1298                 return get_atomic_type_size(type->enumt.akind);
1299         case TYPE_FUNCTION:
1300                 return 0; /* non-const (but "address-const") */
1301         case TYPE_REFERENCE:
1302         case TYPE_POINTER:
1303                 /* TODO: make configurable by backend */
1304                 return 4;
1305         case TYPE_ARRAY: {
1306                 /* TODO: correct if element_type is aligned? */
1307                 il_size_t element_size = get_type_size(type->array.element_type);
1308                 return type->array.size * element_size;
1309         }
1310         case TYPE_BITFIELD:
1311                 return 0;
1312         case TYPE_TYPEDEF:
1313                 return get_type_size(type->typedeft.typedefe->type);
1314         case TYPE_TYPEOF:
1315                 if (type->typeoft.typeof_type) {
1316                         return get_type_size(type->typeoft.typeof_type);
1317                 } else {
1318                         return get_type_size(type->typeoft.expression->base.type);
1319                 }
1320         }
1321         panic("invalid type in get_type_size");
1322 }
1323
1324 unsigned get_type_alignment(type_t *type)
1325 {
1326         switch (type->kind) {
1327         case TYPE_INVALID:
1328                 break;
1329         case TYPE_ERROR:
1330                 return 0;
1331         case TYPE_ATOMIC:
1332                 return get_atomic_type_alignment(type->atomic.akind);
1333         case TYPE_COMPLEX:
1334                 return get_atomic_type_alignment(type->complex.akind);
1335         case TYPE_IMAGINARY:
1336                 return get_atomic_type_alignment(type->imaginary.akind);
1337         case TYPE_COMPOUND_UNION:
1338                 layout_union_type(&type->compound);
1339                 return type->compound.compound->alignment;
1340         case TYPE_COMPOUND_STRUCT:
1341                 layout_struct_type(&type->compound);
1342                 return type->compound.compound->alignment;
1343         case TYPE_ENUM:
1344                 return get_atomic_type_alignment(type->enumt.akind);
1345         case TYPE_FUNCTION:
1346                 /* what is correct here? */
1347                 return 4;
1348         case TYPE_REFERENCE:
1349         case TYPE_POINTER:
1350                 /* TODO: make configurable by backend */
1351                 return 4;
1352         case TYPE_ARRAY:
1353                 return get_type_alignment(type->array.element_type);
1354         case TYPE_BITFIELD:
1355                 return 0;
1356         case TYPE_TYPEDEF: {
1357                 il_alignment_t alignment
1358                         = get_type_alignment(type->typedeft.typedefe->type);
1359                 if (type->typedeft.typedefe->alignment > alignment)
1360                         alignment = type->typedeft.typedefe->alignment;
1361
1362                 return alignment;
1363         }
1364         case TYPE_TYPEOF:
1365                 if (type->typeoft.typeof_type) {
1366                         return get_type_alignment(type->typeoft.typeof_type);
1367                 } else {
1368                         return get_type_alignment(type->typeoft.expression->base.type);
1369                 }
1370         }
1371         panic("invalid type in get_type_alignment");
1372 }
1373
1374 decl_modifiers_t get_type_modifiers(const type_t *type)
1375 {
1376         switch(type->kind) {
1377         case TYPE_INVALID:
1378         case TYPE_ERROR:
1379                 break;
1380         case TYPE_COMPOUND_STRUCT:
1381         case TYPE_COMPOUND_UNION:
1382                 return type->compound.compound->modifiers;
1383         case TYPE_FUNCTION:
1384                 return type->function.modifiers;
1385         case TYPE_ENUM:
1386         case TYPE_ATOMIC:
1387         case TYPE_COMPLEX:
1388         case TYPE_IMAGINARY:
1389         case TYPE_REFERENCE:
1390         case TYPE_POINTER:
1391         case TYPE_BITFIELD:
1392         case TYPE_ARRAY:
1393                 return 0;
1394         case TYPE_TYPEDEF: {
1395                 decl_modifiers_t modifiers = type->typedeft.typedefe->modifiers;
1396                 modifiers |= get_type_modifiers(type->typedeft.typedefe->type);
1397                 return modifiers;
1398         }
1399         case TYPE_TYPEOF:
1400                 if (type->typeoft.typeof_type) {
1401                         return get_type_modifiers(type->typeoft.typeof_type);
1402                 } else {
1403                         return get_type_modifiers(type->typeoft.expression->base.type);
1404                 }
1405         }
1406         panic("invalid type found in get_type_modifiers");
1407 }
1408
1409 type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type)
1410 {
1411         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1412
1413         while (true) {
1414                 switch (type->base.kind) {
1415                 case TYPE_ERROR:
1416                         return TYPE_QUALIFIER_NONE;
1417                 case TYPE_TYPEDEF:
1418                         qualifiers |= type->base.qualifiers;
1419                         const typedef_type_t *typedef_type = &type->typedeft;
1420                         if (typedef_type->resolved_type != NULL)
1421                                 type = typedef_type->resolved_type;
1422                         else
1423                                 type = typedef_type->typedefe->type;
1424                         continue;
1425                 case TYPE_TYPEOF:
1426                         type = type->typeoft.typeof_type;
1427                         continue;
1428                 case TYPE_ARRAY:
1429                         if (skip_array_type) {
1430                                 type = type->array.element_type;
1431                                 continue;
1432                         }
1433                         break;
1434                 default:
1435                         break;
1436                 }
1437                 break;
1438         }
1439         return type->base.qualifiers | qualifiers;
1440 }
1441
1442 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1443 {
1444         assert(kind <= ATOMIC_TYPE_LAST);
1445         return atomic_type_properties[kind].size;
1446 }
1447
1448 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1449 {
1450         assert(kind <= ATOMIC_TYPE_LAST);
1451         return atomic_type_properties[kind].alignment;
1452 }
1453
1454 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1455 {
1456         assert(kind <= ATOMIC_TYPE_LAST);
1457         return atomic_type_properties[kind].flags;
1458 }
1459
1460 atomic_type_kind_t get_intptr_kind(void)
1461 {
1462         if (machine_size <= 32)
1463                 return ATOMIC_TYPE_INT;
1464         else if (machine_size <= 64)
1465                 return ATOMIC_TYPE_LONG;
1466         else
1467                 return ATOMIC_TYPE_LONGLONG;
1468 }
1469
1470 atomic_type_kind_t get_uintptr_kind(void)
1471 {
1472         if (machine_size <= 32)
1473                 return ATOMIC_TYPE_UINT;
1474         else if (machine_size <= 64)
1475                 return ATOMIC_TYPE_ULONG;
1476         else
1477                 return ATOMIC_TYPE_ULONGLONG;
1478 }
1479
1480 /**
1481  * Find the atomic type kind representing a given size (signed).
1482  */
1483 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size)
1484 {
1485         static atomic_type_kind_t kinds[32];
1486
1487         assert(size < 32);
1488         atomic_type_kind_t kind = kinds[size];
1489         if (kind == ATOMIC_TYPE_INVALID) {
1490                 static const atomic_type_kind_t possible_kinds[] = {
1491                         ATOMIC_TYPE_SCHAR,
1492                         ATOMIC_TYPE_SHORT,
1493                         ATOMIC_TYPE_INT,
1494                         ATOMIC_TYPE_LONG,
1495                         ATOMIC_TYPE_LONGLONG
1496                 };
1497                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1498                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1499                                 kind = possible_kinds[i];
1500                                 break;
1501                         }
1502                 }
1503                 kinds[size] = kind;
1504         }
1505         return kind;
1506 }
1507
1508 /**
1509  * Find the atomic type kind representing a given size (signed).
1510  */
1511 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size)
1512 {
1513         static atomic_type_kind_t kinds[32];
1514
1515         assert(size < 32);
1516         atomic_type_kind_t kind = kinds[size];
1517         if (kind == ATOMIC_TYPE_INVALID) {
1518                 static const atomic_type_kind_t possible_kinds[] = {
1519                         ATOMIC_TYPE_UCHAR,
1520                         ATOMIC_TYPE_USHORT,
1521                         ATOMIC_TYPE_UINT,
1522                         ATOMIC_TYPE_ULONG,
1523                         ATOMIC_TYPE_ULONGLONG
1524                 };
1525                 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1526                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1527                                 kind = possible_kinds[i];
1528                                 break;
1529                         }
1530                 }
1531                 kinds[size] = kind;
1532         }
1533         return kind;
1534 }
1535
1536 /**
1537  * Hash the given type and return the "singleton" version
1538  * of it.
1539  */
1540 type_t *identify_new_type(type_t *type)
1541 {
1542         type_t *result = typehash_insert(type);
1543         if (result != type) {
1544                 obstack_free(&type_obst, type);
1545         }
1546         return result;
1547 }
1548
1549 /**
1550  * Creates a new atomic type.
1551  *
1552  * @param akind       The kind of the atomic type.
1553  * @param qualifiers  Type qualifiers for the new type.
1554  */
1555 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1556 {
1557         type_t *const type = allocate_type_zero(TYPE_ATOMIC);
1558         type->base.qualifiers = qualifiers;
1559         type->atomic.akind    = akind;
1560
1561         return identify_new_type(type);
1562 }
1563
1564 /**
1565  * Creates a new complex type.
1566  *
1567  * @param akind       The kind of the atomic type.
1568  * @param qualifiers  Type qualifiers for the new type.
1569  */
1570 type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1571 {
1572         type_t *const type = allocate_type_zero(TYPE_COMPLEX);
1573         type->base.qualifiers = qualifiers;
1574         type->complex.akind   = akind;
1575
1576         return identify_new_type(type);
1577 }
1578
1579 /**
1580  * Creates a new imaginary type.
1581  *
1582  * @param akind       The kind of the atomic type.
1583  * @param qualifiers  Type qualifiers for the new type.
1584  */
1585 type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1586 {
1587         type_t *const type = allocate_type_zero(TYPE_IMAGINARY);
1588         type->base.qualifiers = qualifiers;
1589         type->imaginary.akind = akind;
1590
1591         return identify_new_type(type);
1592 }
1593
1594 /**
1595  * Creates a new pointer type.
1596  *
1597  * @param points_to   The points-to type for the new type.
1598  * @param qualifiers  Type qualifiers for the new type.
1599  */
1600 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1601 {
1602         type_t *const type = allocate_type_zero(TYPE_POINTER);
1603         type->base.qualifiers       = qualifiers;
1604         type->pointer.points_to     = points_to;
1605         type->pointer.base_variable = NULL;
1606
1607         return identify_new_type(type);
1608 }
1609
1610 /**
1611  * Creates a new reference type.
1612  *
1613  * @param refers_to   The referred-to type for the new type.
1614  */
1615 type_t *make_reference_type(type_t *refers_to)
1616 {
1617         type_t *const type = allocate_type_zero(TYPE_REFERENCE);
1618         type->base.qualifiers     = TYPE_QUALIFIER_NONE;
1619         type->reference.refers_to = refers_to;
1620
1621         return identify_new_type(type);
1622 }
1623
1624 /**
1625  * Creates a new based pointer type.
1626  *
1627  * @param points_to   The points-to type for the new type.
1628  * @param qualifiers  Type qualifiers for the new type.
1629  * @param variable    The based variable
1630  */
1631 type_t *make_based_pointer_type(type_t *points_to,
1632                                                                 type_qualifiers_t qualifiers, variable_t *variable)
1633 {
1634         type_t *const type = allocate_type_zero(TYPE_POINTER);
1635         type->base.qualifiers       = qualifiers;
1636         type->pointer.points_to     = points_to;
1637         type->pointer.base_variable = variable;
1638
1639         return identify_new_type(type);
1640 }
1641
1642
1643 type_t *make_array_type(type_t *element_type, size_t size,
1644                         type_qualifiers_t qualifiers)
1645 {
1646         type_t *const type = allocate_type_zero(TYPE_ARRAY);
1647         type->base.qualifiers     = qualifiers;
1648         type->array.element_type  = element_type;
1649         type->array.size          = size;
1650         type->array.size_constant = true;
1651
1652         return identify_new_type(type);
1653 }
1654
1655 static entity_t *pack_bitfield_members(il_size_t *struct_offset,
1656                                        il_alignment_t *struct_alignment,
1657                                                                            bool packed, entity_t *first)
1658 {
1659         il_size_t      offset     = *struct_offset;
1660         il_alignment_t alignment  = *struct_alignment;
1661         size_t         bit_offset = 0;
1662
1663         entity_t *member;
1664         for (member = first; member != NULL; member = member->base.next) {
1665                 if (member->kind != ENTITY_COMPOUND_MEMBER)
1666                         continue;
1667
1668                 type_t *type = member->declaration.type;
1669                 if (type->kind != TYPE_BITFIELD)
1670                         break;
1671
1672                 type_t *base_type = skip_typeref(type->bitfield.base_type);
1673                 il_alignment_t base_alignment = get_type_alignment(base_type);
1674                 il_alignment_t alignment_mask = base_alignment-1;
1675                 if (base_alignment > alignment)
1676                         alignment = base_alignment;
1677
1678                 size_t bit_size = type->bitfield.bit_size;
1679                 if (!packed) {
1680                         bit_offset += (offset & alignment_mask) * BITS_PER_BYTE;
1681                         offset     &= ~alignment_mask;
1682                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1683
1684                         if (bit_offset + bit_size > base_size || bit_size == 0) {
1685                                 offset    += (bit_offset+BITS_PER_BYTE-1) / BITS_PER_BYTE;
1686                                 offset     = (offset + base_alignment-1) & ~alignment_mask;
1687                                 bit_offset = 0;
1688                         }
1689                 }
1690
1691                 if (byte_order_big_endian) {
1692                         size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1693                         member->compound_member.offset     = offset & ~alignment_mask;
1694                         member->compound_member.bit_offset = base_size - bit_offset - bit_size;
1695                 } else {
1696                         member->compound_member.offset     = offset;
1697                         member->compound_member.bit_offset = bit_offset;
1698                 }
1699
1700                 bit_offset += bit_size;
1701                 offset     += bit_offset / BITS_PER_BYTE;
1702                 bit_offset %= BITS_PER_BYTE;
1703         }
1704
1705         if (bit_offset > 0)
1706                 offset += 1;
1707
1708         *struct_offset    = offset;
1709         *struct_alignment = alignment;
1710         return member;
1711 }
1712
1713 void layout_struct_type(compound_type_t *type)
1714 {
1715         assert(type->compound != NULL);
1716
1717         compound_t *compound = type->compound;
1718         if (!compound->complete)
1719                 return;
1720         if (type->compound->layouted)
1721                 return;
1722
1723         il_size_t      offset    = 0;
1724         il_alignment_t alignment = compound->alignment;
1725         bool           need_pad  = false;
1726
1727         entity_t *entry = compound->members.entities;
1728         while (entry != NULL) {
1729                 if (entry->kind != ENTITY_COMPOUND_MEMBER) {
1730                         entry = entry->base.next;
1731                         continue;
1732                 }
1733
1734                 type_t *m_type  = entry->declaration.type;
1735                 type_t *skipped = skip_typeref(m_type);
1736                 if (! is_type_valid(skipped)) {
1737                         entry = entry->base.next;
1738                         continue;
1739                 }
1740
1741                 if (skipped->kind == TYPE_BITFIELD) {
1742                         entry = pack_bitfield_members(&offset, &alignment,
1743                                                       compound->packed, entry);
1744                         continue;
1745                 }
1746
1747                 il_alignment_t m_alignment = get_type_alignment(m_type);
1748                 if (m_alignment > alignment)
1749                         alignment = m_alignment;
1750
1751                 if (!compound->packed) {
1752                         il_size_t new_offset = (offset + m_alignment-1) & -m_alignment;
1753
1754                         if (new_offset > offset) {
1755                                 need_pad = true;
1756                                 offset   = new_offset;
1757                         }
1758                 }
1759
1760                 entry->compound_member.offset = offset;
1761                 offset += get_type_size(m_type);
1762
1763                 entry = entry->base.next;
1764         }
1765
1766         if (!compound->packed) {
1767                 il_size_t new_offset = (offset + alignment-1) & -alignment;
1768                 if (new_offset > offset) {
1769                         need_pad = true;
1770                         offset   = new_offset;
1771                 }
1772         }
1773
1774         source_position_t const *const pos = &compound->base.source_position;
1775         if (need_pad) {
1776                 warningf(WARN_PADDED, pos, "'%T' needs padding", type);
1777         } else if (compound->packed) {
1778                 warningf(WARN_PACKED, pos, "superfluous packed attribute on '%T'", type);
1779         }
1780
1781         compound->size      = offset;
1782         compound->alignment = alignment;
1783         compound->layouted  = true;
1784 }
1785
1786 void layout_union_type(compound_type_t *type)
1787 {
1788         assert(type->compound != NULL);
1789
1790         compound_t *compound = type->compound;
1791         if (! compound->complete)
1792                 return;
1793
1794         il_size_t      size      = 0;
1795         il_alignment_t alignment = compound->alignment;
1796
1797         entity_t *entry = compound->members.entities;
1798         for (; entry != NULL; entry = entry->base.next) {
1799                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
1800                         continue;
1801
1802                 type_t *m_type = entry->declaration.type;
1803                 if (! is_type_valid(skip_typeref(m_type)))
1804                         continue;
1805
1806                 entry->compound_member.offset = 0;
1807                 il_size_t m_size = get_type_size(m_type);
1808                 if (m_size > size)
1809                         size = m_size;
1810                 il_alignment_t m_alignment = get_type_alignment(m_type);
1811                 if (m_alignment > alignment)
1812                         alignment = m_alignment;
1813         }
1814         size = (size + alignment - 1) & -alignment;
1815
1816         compound->size      = size;
1817         compound->alignment = alignment;
1818 }
1819
1820 function_parameter_t *allocate_parameter(type_t *const type)
1821 {
1822         function_parameter_t *const param = obstack_alloc(&type_obst, sizeof(*param));
1823         memset(param, 0, sizeof(*param));
1824         param->type = type;
1825         return param;
1826 }
1827
1828 type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
1829                              type_t *argument_type2)
1830 {
1831         function_parameter_t *const parameter2 = allocate_parameter(argument_type2);
1832         function_parameter_t *const parameter1 = allocate_parameter(argument_type1);
1833         parameter1->next = parameter2;
1834
1835         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1836         type->function.return_type = return_type;
1837         type->function.parameters  = parameter1;
1838         type->function.linkage     = LINKAGE_C;
1839
1840         return identify_new_type(type);
1841 }
1842
1843 type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
1844 {
1845         function_parameter_t *const parameter = allocate_parameter(argument_type);
1846
1847         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1848         type->function.return_type = return_type;
1849         type->function.parameters  = parameter;
1850         type->function.linkage     = LINKAGE_C;
1851
1852         return identify_new_type(type);
1853 }
1854
1855 type_t *make_function_1_type_variadic(type_t *return_type,
1856                                       type_t *argument_type)
1857 {
1858         function_parameter_t *const parameter = allocate_parameter(argument_type);
1859
1860         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1861         type->function.return_type = return_type;
1862         type->function.parameters  = parameter;
1863         type->function.variadic    = true;
1864         type->function.linkage     = LINKAGE_C;
1865
1866         return identify_new_type(type);
1867 }
1868
1869 type_t *make_function_0_type(type_t *return_type)
1870 {
1871         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1872         type->function.return_type = return_type;
1873         type->function.parameters  = NULL;
1874         type->function.linkage     = LINKAGE_C;
1875
1876         return identify_new_type(type);
1877 }
1878
1879 type_t *make_function_type(type_t *return_type, int n_types,
1880                            type_t *const *argument_types,
1881                                                    decl_modifiers_t modifiers)
1882 {
1883         type_t *type               = allocate_type_zero(TYPE_FUNCTION);
1884         type->function.return_type = return_type;
1885         type->function.modifiers  |= modifiers;
1886         type->function.linkage     = LINKAGE_C;
1887
1888         function_parameter_t *last  = NULL;
1889         for (int i = 0; i < n_types; ++i) {
1890                 function_parameter_t *parameter = allocate_parameter(argument_types[i]);
1891                 if (last == NULL) {
1892                         type->function.parameters = parameter;
1893                 } else {
1894                         last->next = parameter;
1895                 }
1896                 last = parameter;
1897         }
1898
1899         return identify_new_type(type);
1900 }
1901
1902 /**
1903  * Debug helper. Prints the given type to stdout.
1904  */
1905 static __attribute__((unused))
1906 void dbg_type(const type_t *type)
1907 {
1908         print_to_file(stderr);
1909         print_type(type);
1910         print_string("\n");
1911         fflush(stderr);
1912 }