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 "symbol_t.h"
  27 #include "type_hash.h"
  28 #include "adt/error.h"
  29 #include "lang_features.h"
  30
  31 static struct obstack   _type_obst;
  32 static FILE            *out;
  33 struct obstack         *type_obst                 = &_type_obst;
  34 static int              type_visited              = 0;
  35 static bool             print_implicit_array_size = false;
  36
  37 static void intern_print_type_pre(const type_t *type, bool top);
  38 static void intern_print_type_post(const type_t *type, bool top);
  39
  40 typedef struct atomic_type_properties_t atomic_type_properties_t;
  41 struct atomic_type_properties_t {
  42         unsigned   size;              /**< type size in bytes */
  43         unsigned   alignment;         /**< type alignment in bytes */
  44         unsigned   flags;             /**< type flags from atomic_type_flag_t */
  45 };
  46
  47 static atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
  48         //ATOMIC_TYPE_INVALID = 0,
  49         [ATOMIC_TYPE_VOID] = {
  50                 .size       = 0,
  51                 .alignment  = 0,
  52                 .flags      = ATOMIC_TYPE_FLAG_NONE
  53         },
  54         [ATOMIC_TYPE_CHAR] = {
  55                 .size       = 1,
  56                 .alignment  = 1,
  57                 /* signed flag will be set when known */
  58                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  59         },
  60         [ATOMIC_TYPE_SCHAR] = {
  61                 .size       = 1,
  62                 .alignment  = 1,
  63                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  64                               | ATOMIC_TYPE_FLAG_SIGNED,
  65         },
  66         [ATOMIC_TYPE_UCHAR] = {
  67                 .size       = 1,
  68                 .alignment  = 1,
  69                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  70         },
  71         [ATOMIC_TYPE_SHORT] = {
  72                 .size       = 2,
  73                 .alignment  = 2,
  74                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  75                               | ATOMIC_TYPE_FLAG_SIGNED
  76         },
  77         [ATOMIC_TYPE_USHORT] = {
  78                 .size       = 2,
  79                 .alignment  = 2,
  80                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  81         },
  82         [ATOMIC_TYPE_INT] = {
  83                 .size       = (unsigned) -1,
  84                 .alignment  = (unsigned) -1,
  85                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  86                               | ATOMIC_TYPE_FLAG_SIGNED,
  87         },
  88         [ATOMIC_TYPE_UINT] = {
  89                 .size       = (unsigned) -1,
  90                 .alignment  = (unsigned) -1,
  91                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
  92         },
  93         [ATOMIC_TYPE_LONG] = {
  94                 .size       = (unsigned) -1,
  95                 .alignment  = (unsigned) -1,
  96                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
  97                               | ATOMIC_TYPE_FLAG_SIGNED,
  98         },
  99         [ATOMIC_TYPE_ULONG] = {
 100                 .size       = (unsigned) -1,
 101                 .alignment  = (unsigned) -1,
 102                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 103         },
 104         [ATOMIC_TYPE_LONGLONG] = {
 105                 .size       = (unsigned) -1,
 106                 .alignment  = (unsigned) -1,
 107                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
 108                               | ATOMIC_TYPE_FLAG_SIGNED,
 109         },
 110         [ATOMIC_TYPE_ULONGLONG] = {
 111                 .size       = (unsigned) -1,
 112                 .alignment  = (unsigned) -1,
 113                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 114         },
 115         [ATOMIC_TYPE_BOOL] = {
 116                 .size       = (unsigned) -1,
 117                 .alignment  = (unsigned) -1,
 118                 .flags      = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
 119         },
 120         [ATOMIC_TYPE_FLOAT] = {
 121                 .size       = 4,
 122                 .alignment  = (unsigned) -1,
 123                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 124                               | ATOMIC_TYPE_FLAG_SIGNED,
 125         },
 126         [ATOMIC_TYPE_DOUBLE] = {
 127                 .size       = 8,
 128                 .alignment  = (unsigned) -1,
 129                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 130                               | ATOMIC_TYPE_FLAG_SIGNED,
 131         },
 132         [ATOMIC_TYPE_LONG_DOUBLE] = {
 133                 .size       = 12,
 134                 .alignment  = (unsigned) -1,
 135                 .flags      = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
 136                               | ATOMIC_TYPE_FLAG_SIGNED,
 137         },
 138         /* complex and imaginary types are set in init_types */
 139 };
 140
 141 void init_types(void)
 142 {
 143         obstack_init(type_obst);
 144
 145         atomic_type_properties_t *props = atomic_type_properties;
 146
 147         if (char_is_signed) {
 148                 props[ATOMIC_TYPE_CHAR].flags |= ATOMIC_TYPE_FLAG_SIGNED;
 149         }
 150
 151         unsigned int_size   = machine_size < 32 ? 2 : 4;
 152         unsigned long_size  = machine_size < 64 ? 4 : 8;
 153         unsigned llong_size = machine_size < 32 ? 4 : 8;
 154
 155         props[ATOMIC_TYPE_INT].size            = int_size;
 156         props[ATOMIC_TYPE_INT].alignment       = int_size;
 157         props[ATOMIC_TYPE_UINT].size           = int_size;
 158         props[ATOMIC_TYPE_UINT].alignment      = int_size;
 159         props[ATOMIC_TYPE_LONG].size           = long_size;
 160         props[ATOMIC_TYPE_LONG].alignment      = long_size;
 161         props[ATOMIC_TYPE_ULONG].size          = long_size;
 162         props[ATOMIC_TYPE_ULONG].alignment     = long_size;
 163         props[ATOMIC_TYPE_LONGLONG].size       = llong_size;
 164         props[ATOMIC_TYPE_LONGLONG].alignment  = llong_size;
 165         props[ATOMIC_TYPE_ULONGLONG].size      = llong_size;
 166         props[ATOMIC_TYPE_ULONGLONG].alignment = llong_size;
 167
 168         /* TODO: backend specific, need a way to query the backend for this.
 169          * The following are good settings for x86 */
 170         props[ATOMIC_TYPE_FLOAT].alignment       = 4;
 171         props[ATOMIC_TYPE_DOUBLE].alignment      = 4;
 172         props[ATOMIC_TYPE_LONG_DOUBLE].alignment = 4;
 173         props[ATOMIC_TYPE_LONGLONG].alignment    = 4;
 174         props[ATOMIC_TYPE_ULONGLONG].alignment   = 4;
 175
 176         props[ATOMIC_TYPE_BOOL] = props[ATOMIC_TYPE_UINT];
 177 }
 178
 179 void exit_types(void)
 180 {
 181         obstack_free(type_obst, NULL);
 182 }
 183
 184 void type_set_output(FILE *stream)
 185 {
 186         out = stream;
 187 }
 188
 189 void inc_type_visited(void)
 190 {
 191         type_visited++;
 192 }
 193
 194 void print_type_qualifiers(type_qualifiers_t qualifiers)
 195 {
 196         if (qualifiers & TYPE_QUALIFIER_CONST)    fputs("const ",    out);
 197         if (qualifiers & TYPE_QUALIFIER_VOLATILE) fputs("volatile ", out);
 198         if (qualifiers & TYPE_QUALIFIER_RESTRICT) fputs("restrict ", out);
 199 }
 200
 201 /**
 202  * Prints the name of an atomic type kinds.
 203  *
 204  * @param kind  The type kind.
 205  */
 206 static
 207 void print_atomic_kinds(atomic_type_kind_t kind)
 208 {
 209         const char *s = "INVALIDATOMIC";
 210         switch(kind) {
 211         case ATOMIC_TYPE_INVALID:                               break;
 212         case ATOMIC_TYPE_VOID:        s = "void";               break;
 213         case ATOMIC_TYPE_BOOL:        s = "_Bool";              break;
 214         case ATOMIC_TYPE_CHAR:        s = "char";               break;
 215         case ATOMIC_TYPE_SCHAR:       s = "signed char";        break;
 216         case ATOMIC_TYPE_UCHAR:       s = "unsigned char";      break;
 217         case ATOMIC_TYPE_INT:         s = "int";                break;
 218         case ATOMIC_TYPE_UINT:        s = "unsigned int";       break;
 219         case ATOMIC_TYPE_SHORT:       s = "short";              break;
 220         case ATOMIC_TYPE_USHORT:      s = "unsigned short";     break;
 221         case ATOMIC_TYPE_LONG:        s = "long";               break;
 222         case ATOMIC_TYPE_ULONG:       s = "unsigned long";      break;
 223         case ATOMIC_TYPE_LONGLONG:    s = "long long";          break;
 224         case ATOMIC_TYPE_ULONGLONG:   s = "unsigned long long"; break;
 225         case ATOMIC_TYPE_LONG_DOUBLE: s = "long double";        break;
 226         case ATOMIC_TYPE_FLOAT:       s = "float";              break;
 227         case ATOMIC_TYPE_DOUBLE:      s = "double";             break;
 228         }
 229         fputs(s, out);
 230 }
 231
 232 /**
 233  * Prints the name of an atomic type.
 234  *
 235  * @param type  The type.
 236  */
 237 static
 238 void print_atomic_type(const atomic_type_t *type)
 239 {
 240         print_type_qualifiers(type->base.qualifiers);
 241         print_atomic_kinds(type->akind);
 242 }
 243
 244 /**
 245  * Prints the name of a complex type.
 246  *
 247  * @param type  The type.
 248  */
 249 static
 250 void print_complex_type(const complex_type_t *type)
 251 {
 252         print_type_qualifiers(type->base.qualifiers);
 253         fputs("_Complex ", out);
 254         print_atomic_kinds(type->akind);
 255 }
 256
 257 /**
 258  * Prints the name of an imaginary type.
 259  *
 260  * @param type  The type.
 261  */
 262 static
 263 void print_imaginary_type(const imaginary_type_t *type)
 264 {
 265         print_type_qualifiers(type->base.qualifiers);
 266         fputs("_Imaginary ", out);
 267         print_atomic_kinds(type->akind);
 268 }
 269
 270 /**
 271  * Print the first part (the prefix) of a type.
 272  *
 273  * @param type   The type to print.
 274  * @param top    true, if this is the top type, false if it's an embedded type.
 275  */
 276 static void print_function_type_pre(const function_type_t *type, bool top)
 277 {
 278         print_type_qualifiers(type->base.qualifiers);
 279
 280         intern_print_type_pre(type->return_type, false);
 281
 282         switch (type->calling_convention) {
 283         case CC_CDECL:
 284                 fputs(" __cdecl ", out);
 285                 break;
 286         case CC_STDCALL:
 287                 fputs(" __stdcall ", out);
 288                 break;
 289         case CC_FASTCALL:
 290                 fputs(" __fastcall ", out);
 291                 break;
 292         case CC_THISCALL:
 293                 fputs(" __thiscall ", out);
 294                 break;
 295         case CC_DEFAULT:
 296                 break;
 297         }
 298
 299         /* don't emit braces if we're the toplevel type... */
 300         if (!top)
 301                 fputc('(', out);
 302 }
 303
 304 /**
 305  * Print the second part (the postfix) of a type.
 306  *
 307  * @param type   The type to print.
 308  * @param top    true, if this is the top type, false if it's an embedded type.
 309  */
 310 static void print_function_type_post(const function_type_t *type,
 311                                      const scope_t *scope, bool top)
 312 {
 313         intern_print_type_post(type->return_type, false);
 314
 315         fputc('(', out);
 316         bool first = true;
 317         if (scope == NULL) {
 318                 function_parameter_t *parameter = type->parameters;
 319                 for( ; parameter != NULL; parameter = parameter->next) {
 320                         if (first) {
 321                                 first = false;
 322                         } else {
 323                                 fputs(", ", out);
 324                         }
 325                         print_type(parameter->type);
 326                 }
 327         } else {
 328                 declaration_t *parameter = scope->declarations;
 329                 for( ; parameter != NULL; parameter = parameter->next) {
 330                         if (first) {
 331                                 first = false;
 332                         } else {
 333                                 fputs(", ", out);
 334                         }
 335                         print_type_ext(parameter->type, parameter->symbol,
 336                                        &parameter->scope);
 337                 }
 338         }
 339         if (type->variadic) {
 340                 if (first) {
 341                         first = false;
 342                 } else {
 343                         fputs(", ", out);
 344                 }
 345                 fputs("...", out);
 346         }
 347         if (first && !type->unspecified_parameters) {
 348                 fputs("void", out);
 349         }
 350         fputc(')', out);
 351
 352         /* don't emit braces if we're the toplevel type... */
 353         if (!top)
 354                 fputc(')', out);
 355 }
 356
 357 /**
 358  * Prints the prefix part of a pointer type.
 359  *
 360  * @param type   The pointer type.
 361  */
 362 static void print_pointer_type_pre(const pointer_type_t *type)
 363 {
 364         intern_print_type_pre(type->points_to, false);
 365         fputs("*", out);
 366         print_type_qualifiers(type->base.qualifiers);
 367 }
 368
 369 /**
 370  * Prints the postfix part of a pointer type.
 371  *
 372  * @param type   The pointer type.
 373  */
 374 static void print_pointer_type_post(const pointer_type_t *type)
 375 {
 376         intern_print_type_post(type->points_to, false);
 377 }
 378
 379 /**
 380  * Prints the prefix part of an array type.
 381  *
 382  * @param type   The array type.
 383  */
 384 static void print_array_type_pre(const array_type_t *type)
 385 {
 386         intern_print_type_pre(type->element_type, false);
 387 }
 388
 389 /**
 390  * Prints the postfix part of an array type.
 391  *
 392  * @param type   The array type.
 393  */
 394 static void print_array_type_post(const array_type_t *type)
 395 {
 396         fputc('[', out);
 397         if (type->is_static) {
 398                 fputs("static ", out);
 399         }
 400         print_type_qualifiers(type->base.qualifiers);
 401         if (type->size_expression != NULL
 402                         && (print_implicit_array_size || !type->has_implicit_size)) {
 403                 print_expression(type->size_expression);
 404         }
 405         fputc(']', out);
 406         intern_print_type_post(type->element_type, false);
 407 }
 408
 409 /**
 410  * Prints the postfix part of a bitfield type.
 411  *
 412  * @param type   The array type.
 413  */
 414 static void print_bitfield_type_post(const bitfield_type_t *type)
 415 {
 416         fputs(" : ", out);
 417         print_expression(type->size);
 418         intern_print_type_post(type->base_type, false);
 419 }
 420
 421 /**
 422  * Prints an enum definition.
 423  *
 424  * @param declaration  The enum's type declaration.
 425  */
 426 void print_enum_definition(const declaration_t *declaration)
 427 {
 428         fputs("{\n", out);
 429
 430         change_indent(1);
 431
 432         declaration_t *entry = declaration->next;
 433         for( ; entry != NULL && entry->storage_class == STORAGE_CLASS_ENUM_ENTRY;
 434                entry = entry->next) {
 435
 436                 print_indent();
 437                 fprintf(out, "%s", entry->symbol->string);
 438                 if (entry->init.initializer != NULL) {
 439                         fprintf(out, " = ");
 440
 441                         /* skip the implicit cast */
 442                         expression_t *expression = entry->init.enum_value;
 443                         if (expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
 444                                 expression = expression->unary.value;
 445                         }
 446                         print_expression(expression);
 447                 }
 448                 fprintf(out, ",\n");
 449         }
 450
 451         change_indent(-1);
 452         print_indent();
 453         fputs("}", out);
 454 }
 455
 456 /**
 457  * Prints an enum type.
 458  *
 459  * @param type  The enum type.
 460  */
 461 static void print_type_enum(const enum_type_t *type)
 462 {
 463         print_type_qualifiers(type->base.qualifiers);
 464         fputs("enum ", out);
 465
 466         declaration_t *declaration = type->declaration;
 467         symbol_t      *symbol      = declaration->symbol;
 468         if (symbol != NULL) {
 469                 fputs(symbol->string, out);
 470         } else {
 471                 print_enum_definition(declaration);
 472         }
 473 }
 474
 475 /**
 476  * Print the compound part of a compound type.
 477  *
 478  * @param declaration  The declaration of the compound type.
 479  */
 480 void print_compound_definition(const declaration_t *declaration)
 481 {
 482         fputs("{\n", out);
 483         change_indent(1);
 484
 485         declaration_t *iter = declaration->scope.declarations;
 486         for( ; iter != NULL; iter = iter->next) {
 487                 print_indent();
 488                 print_declaration(iter);
 489                 fputc('\n', out);
 490         }
 491
 492         change_indent(-1);
 493         print_indent();
 494         fputs("}", out);
 495 }
 496
 497 /**
 498  * Prints a compound type.
 499  *
 500  * @param type  The compound type.
 501  */
 502 static void print_compound_type(const compound_type_t *type)
 503 {
 504         print_type_qualifiers(type->base.qualifiers);
 505
 506         if (type->base.kind == TYPE_COMPOUND_STRUCT) {
 507                 fputs("struct ", out);
 508         } else {
 509                 assert(type->base.kind == TYPE_COMPOUND_UNION);
 510                 fputs("union ", out);
 511         }
 512
 513         declaration_t *declaration = type->declaration;
 514         symbol_t      *symbol      = declaration->symbol;
 515         if (symbol != NULL) {
 516                 fputs(symbol->string, out);
 517         } else {
 518                 print_compound_definition(declaration);
 519         }
 520 }
 521
 522 /**
 523  * Prints the prefix part of a typedef type.
 524  *
 525  * @param type   The typedef type.
 526  */
 527 static void print_typedef_type_pre(const typedef_type_t *const type)
 528 {
 529         print_type_qualifiers(type->base.qualifiers);
 530         fputs(type->declaration->symbol->string, out);
 531 }
 532
 533 /**
 534  * Prints the prefix part of a typeof type.
 535  *
 536  * @param type   The typeof type.
 537  */
 538 static void print_typeof_type_pre(const typeof_type_t *const type)
 539 {
 540         fputs("typeof(", out);
 541         if (type->expression != NULL) {
 542                 assert(type->typeof_type == NULL);
 543                 print_expression(type->expression);
 544         } else {
 545                 print_type(type->typeof_type);
 546         }
 547         fputc(')', out);
 548 }
 549
 550 /**
 551  * Prints the prefix part of a type.
 552  *
 553  * @param type   The type.
 554  * @param top    true if we print the toplevel type, false else.
 555  */
 556 static void intern_print_type_pre(const type_t *const type, const bool top)
 557 {
 558         switch(type->kind) {
 559         case TYPE_ERROR:
 560                 fputs("<error>", out);
 561                 return;
 562         case TYPE_INVALID:
 563                 fputs("<invalid>", out);
 564                 return;
 565         case TYPE_ENUM:
 566                 print_type_enum(&type->enumt);
 567                 return;
 568         case TYPE_ATOMIC:
 569                 print_atomic_type(&type->atomic);
 570                 return;
 571         case TYPE_COMPLEX:
 572                 print_complex_type(&type->complex);
 573                 return;
 574         case TYPE_IMAGINARY:
 575                 print_imaginary_type(&type->imaginary);
 576                 return;
 577         case TYPE_COMPOUND_STRUCT:
 578         case TYPE_COMPOUND_UNION:
 579                 print_compound_type(&type->compound);
 580                 return;
 581         case TYPE_BUILTIN:
 582                 fputs(type->builtin.symbol->string, out);
 583                 return;
 584         case TYPE_FUNCTION:
 585                 print_function_type_pre(&type->function, top);
 586                 return;
 587         case TYPE_POINTER:
 588                 print_pointer_type_pre(&type->pointer);
 589                 return;
 590         case TYPE_BITFIELD:
 591                 intern_print_type_pre(type->bitfield.base_type, top);
 592                 return;
 593         case TYPE_ARRAY:
 594                 print_array_type_pre(&type->array);
 595                 return;
 596         case TYPE_TYPEDEF:
 597                 print_typedef_type_pre(&type->typedeft);
 598                 return;
 599         case TYPE_TYPEOF:
 600                 print_typeof_type_pre(&type->typeoft);
 601                 return;
 602         }
 603         fputs("unknown", out);
 604 }
 605
 606 /**
 607  * Prints the postfix part of a type.
 608  *
 609  * @param type   The type.
 610  * @param top    true if we print the toplevel type, false else.
 611  */
 612 static void intern_print_type_post(const type_t *const type, const bool top)
 613 {
 614         switch(type->kind) {
 615         case TYPE_FUNCTION:
 616                 print_function_type_post(&type->function, NULL, top);
 617                 return;
 618         case TYPE_POINTER:
 619                 print_pointer_type_post(&type->pointer);
 620                 return;
 621         case TYPE_ARRAY:
 622                 print_array_type_post(&type->array);
 623                 return;
 624         case TYPE_BITFIELD:
 625                 print_bitfield_type_post(&type->bitfield);
 626                 return;
 627         case TYPE_ERROR:
 628         case TYPE_INVALID:
 629         case TYPE_ATOMIC:
 630         case TYPE_COMPLEX:
 631         case TYPE_IMAGINARY:
 632         case TYPE_ENUM:
 633         case TYPE_COMPOUND_STRUCT:
 634         case TYPE_COMPOUND_UNION:
 635         case TYPE_BUILTIN:
 636         case TYPE_TYPEOF:
 637         case TYPE_TYPEDEF:
 638                 break;
 639         }
 640 }
 641
 642 /**
 643  * Prints a type.
 644  *
 645  * @param type   The type.
 646  */
 647 void print_type(const type_t *const type)
 648 {
 649         print_type_ext(type, NULL, NULL);
 650 }
 651
 652 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 653                     const scope_t *scope)
 654 {
 655         if (type == NULL) {
 656                 fputs("nil type", out);
 657                 return;
 658         }
 659
 660         intern_print_type_pre(type, true);
 661         if (symbol != NULL) {
 662                 fputc(' ', out);
 663                 fputs(symbol->string, out);
 664         }
 665         if (type->kind == TYPE_FUNCTION) {
 666                 print_function_type_post(&type->function, scope, true);
 667         } else {
 668                 intern_print_type_post(type, true);
 669         }
 670 }
 671
 672 /**
 673  * Return the size of a type AST node.
 674  *
 675  * @param type  The type.
 676  */
 677 static size_t get_type_size(const type_t *type)
 678 {
 679         switch(type->kind) {
 680         case TYPE_ATOMIC:          return sizeof(atomic_type_t);
 681         case TYPE_COMPLEX:         return sizeof(complex_type_t);
 682         case TYPE_IMAGINARY:       return sizeof(imaginary_type_t);
 683         case TYPE_COMPOUND_STRUCT:
 684         case TYPE_COMPOUND_UNION:  return sizeof(compound_type_t);
 685         case TYPE_ENUM:            return sizeof(enum_type_t);
 686         case TYPE_FUNCTION:        return sizeof(function_type_t);
 687         case TYPE_POINTER:         return sizeof(pointer_type_t);
 688         case TYPE_ARRAY:           return sizeof(array_type_t);
 689         case TYPE_BUILTIN:         return sizeof(builtin_type_t);
 690         case TYPE_TYPEDEF:         return sizeof(typedef_type_t);
 691         case TYPE_TYPEOF:          return sizeof(typeof_type_t);
 692         case TYPE_BITFIELD:        return sizeof(bitfield_type_t);
 693         case TYPE_ERROR:           panic("error type found");
 694         case TYPE_INVALID:         panic("invalid type found");
 695         }
 696         panic("unknown type found");
 697 }
 698
 699 /**
 700  * Duplicates a type.
 701  *
 702  * @param type  The type to copy.
 703  * @return A copy of the type.
 704  *
 705  * @note This does not produce a deep copy!
 706  */
 707 type_t *duplicate_type(const type_t *type)
 708 {
 709         size_t size = get_type_size(type);
 710
 711         type_t *copy = obstack_alloc(type_obst, size);
 712         memcpy(copy, type, size);
 713
 714         return copy;
 715 }
 716
 717 /**
 718  * Returns the unqualified type of a given type.
 719  *
 720  * @param type  The type.
 721  * @returns The unqualified type.
 722  */
 723 type_t *get_unqualified_type(type_t *type)
 724 {
 725         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 726                 return type;
 727
 728         type_t *unqualified_type          = duplicate_type(type);
 729         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 730
 731         type_t *result = typehash_insert(unqualified_type);
 732         if (result != unqualified_type) {
 733                 obstack_free(type_obst, unqualified_type);
 734         }
 735
 736         return result;
 737 }
 738
 739 /**
 740  * Check if a type is valid.
 741  *
 742  * @param type  The type to check.
 743  * @return true if type represents a valid type.
 744  */
 745 bool type_valid(const type_t *type)
 746 {
 747         return type->kind != TYPE_INVALID;
 748 }
 749
 750 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 751                                   atomic_type_flag_t flag)
 752 {
 753         assert(kind <= ATOMIC_TYPE_LAST);
 754         return (atomic_type_properties[kind].flags & flag) != 0;
 755 }
 756
 757 /**
 758  * Returns true if the given type is an integer type.
 759  *
 760  * @param type  The type to check.
 761  * @return True if type is an integer type.
 762  */
 763 bool is_type_integer(const type_t *type)
 764 {
 765         assert(!is_typeref(type));
 766
 767         if (type->kind == TYPE_ENUM)
 768                 return true;
 769         if (type->kind == TYPE_BITFIELD)
 770                 return true;
 771
 772         if (type->kind != TYPE_ATOMIC)
 773                 return false;
 774
 775         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 776 }
 777
 778 /**
 779  * Returns true if the given type is an enum type.
 780  *
 781  * @param type  The type to check.
 782  * @return True if type is an enum type.
 783  */
 784 bool is_type_enum(const type_t *type)
 785 {
 786         assert(!is_typeref(type));
 787         return type->kind == TYPE_ENUM;
 788 }
 789
 790 /**
 791  * Returns true if the given type is an floating point type.
 792  *
 793  * @param type  The type to check.
 794  * @return True if type is a floating point type.
 795  */
 796 bool is_type_float(const type_t *type)
 797 {
 798         assert(!is_typeref(type));
 799
 800         if (type->kind != TYPE_ATOMIC)
 801                 return false;
 802
 803         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 804 }
 805
 806 /**
 807  * Returns true if the given type is a signed type.
 808  *
 809  * @param type  The type to check.
 810  * @return True if type is a signed type.
 811  */
 812 bool is_type_signed(const type_t *type)
 813 {
 814         assert(!is_typeref(type));
 815
 816         /* enum types are int for now */
 817         if (type->kind == TYPE_ENUM)
 818                 return true;
 819         if (type->kind == TYPE_BITFIELD)
 820                 return is_type_signed(type->bitfield.base_type);
 821
 822         if (type->kind != TYPE_ATOMIC)
 823                 return false;
 824
 825         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 826 }
 827
 828 /**
 829  * Returns true if the given type represents an arithmetic type.
 830  *
 831  * @param type  The type to check.
 832  * @return True if type represents an arithmetic type.
 833  */
 834 bool is_type_arithmetic(const type_t *type)
 835 {
 836         assert(!is_typeref(type));
 837
 838         switch(type->kind) {
 839         case TYPE_BITFIELD:
 840         case TYPE_ENUM:
 841                 return true;
 842         case TYPE_ATOMIC:
 843                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 844         case TYPE_COMPLEX:
 845                 return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 846         case TYPE_IMAGINARY:
 847                 return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 848         default:
 849                 return false;
 850         }
 851 }
 852
 853 /**
 854  * Returns true if the given type is an integer or float type.
 855  *
 856  * @param type  The type to check.
 857  * @return True if type is an integer or float type.
 858  */
 859 bool is_type_real(const type_t *type)
 860 {
 861         /* 6.2.5.17 */
 862         return is_type_integer(type)
 863                 || (type->kind == TYPE_ATOMIC && is_type_float(type));
 864 }
 865
 866 /**
 867  * Returns true if the given type represents a scalar type.
 868  *
 869  * @param type  The type to check.
 870  * @return True if type represents a scalar type.
 871  */
 872 bool is_type_scalar(const type_t *type)
 873 {
 874         assert(!is_typeref(type));
 875
 876         switch (type->kind) {
 877                 case TYPE_POINTER: return true;
 878                 case TYPE_BUILTIN: return is_type_scalar(type->builtin.real_type);
 879                 default:           break;
 880         }
 881
 882         return is_type_arithmetic(type);
 883 }
 884
 885 /**
 886  * Check if a given type is incomplete.
 887  *
 888  * @param type  The type to check.
 889  * @return True if the given type is incomplete (ie. just forward).
 890  */
 891 bool is_type_incomplete(const type_t *type)
 892 {
 893         assert(!is_typeref(type));
 894
 895         switch(type->kind) {
 896         case TYPE_COMPOUND_STRUCT:
 897         case TYPE_COMPOUND_UNION: {
 898                 const compound_type_t *compound_type = &type->compound;
 899                 declaration_t         *declaration   = compound_type->declaration;
 900                 return !declaration->init.complete;
 901         }
 902         case TYPE_ENUM: {
 903                 const enum_type_t *enum_type   = &type->enumt;
 904                 declaration_t     *declaration = enum_type->declaration;
 905                 return !declaration->init.complete;
 906         }
 907
 908         case TYPE_ARRAY:
 909                 return type->array.size_expression == NULL
 910                         && !type->array.size_constant;
 911
 912         case TYPE_ATOMIC:
 913                 return type->atomic.akind == ATOMIC_TYPE_VOID;
 914
 915         case TYPE_COMPLEX:
 916                 return type->complex.akind == ATOMIC_TYPE_VOID;
 917
 918         case TYPE_IMAGINARY:
 919                 return type->imaginary.akind == ATOMIC_TYPE_VOID;
 920
 921         case TYPE_BITFIELD:
 922         case TYPE_FUNCTION:
 923         case TYPE_POINTER:
 924         case TYPE_BUILTIN:
 925         case TYPE_ERROR:
 926                 return false;
 927
 928         case TYPE_TYPEDEF:
 929         case TYPE_TYPEOF:
 930                 panic("is_type_incomplete called without typerefs skipped");
 931         case TYPE_INVALID:
 932                 break;
 933         }
 934
 935         panic("invalid type found");
 936 }
 937
 938 bool is_type_object(const type_t *type)
 939 {
 940         return !is_type_function(type) && !is_type_incomplete(type);
 941 }
 942
 943 /**
 944  * Check if two function types are compatible.
 945  */
 946 static bool function_types_compatible(const function_type_t *func1,
 947                                       const function_type_t *func2)
 948 {
 949         const type_t* const ret1 = skip_typeref(func1->return_type);
 950         const type_t* const ret2 = skip_typeref(func2->return_type);
 951         if (!types_compatible(ret1, ret2))
 952                 return false;
 953
 954         /* can parameters be compared? */
 955         if (func1->unspecified_parameters || func2->unspecified_parameters)
 956                 return true;
 957
 958         if (func1->variadic != func2->variadic)
 959                 return false;
 960
 961         if (func1->calling_convention != func2->calling_convention)
 962                 return false;
 963
 964         /* TODO: handling of unspecified parameters not correct yet */
 965
 966         /* all argument types must be compatible */
 967         function_parameter_t *parameter1 = func1->parameters;
 968         function_parameter_t *parameter2 = func2->parameters;
 969         for ( ; parameter1 != NULL && parameter2 != NULL;
 970                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
 971                 type_t *parameter1_type = skip_typeref(parameter1->type);
 972                 type_t *parameter2_type = skip_typeref(parameter2->type);
 973
 974                 parameter1_type = get_unqualified_type(parameter1_type);
 975                 parameter2_type = get_unqualified_type(parameter2_type);
 976
 977                 if (!types_compatible(parameter1_type, parameter2_type))
 978                         return false;
 979         }
 980         /* same number of arguments? */
 981         if (parameter1 != NULL || parameter2 != NULL)
 982                 return false;
 983
 984         return true;
 985 }
 986
 987 /**
 988  * Check if two array types are compatible.
 989  */
 990 static bool array_types_compatible(const array_type_t *array1,
 991                                    const array_type_t *array2)
 992 {
 993         type_t *element_type1 = skip_typeref(array1->element_type);
 994         type_t *element_type2 = skip_typeref(array2->element_type);
 995         if (!types_compatible(element_type1, element_type2))
 996                 return false;
 997
 998         if (!array1->size_constant || !array2->size_constant)
 999                 return true;
1000
1001         return array1->size == array2->size;
1002 }
1003
1004 /**
1005  * Check if two types are compatible.
1006  */
1007 bool types_compatible(const type_t *type1, const type_t *type2)
1008 {
1009         assert(!is_typeref(type1));
1010         assert(!is_typeref(type2));
1011
1012         /* shortcut: the same type is always compatible */
1013         if (type1 == type2)
1014                 return true;
1015
1016         if (type1->base.qualifiers != type2->base.qualifiers)
1017                 return false;
1018         if (type1->kind != type2->kind)
1019                 return false;
1020
1021         switch(type1->kind) {
1022         case TYPE_FUNCTION:
1023                 return function_types_compatible(&type1->function, &type2->function);
1024         case TYPE_ATOMIC:
1025                 return type1->atomic.akind == type2->atomic.akind;
1026         case TYPE_COMPLEX:
1027                 return type1->complex.akind == type2->complex.akind;
1028         case TYPE_IMAGINARY:
1029                 return type1->imaginary.akind == type2->imaginary.akind;
1030         case TYPE_ARRAY:
1031                 return array_types_compatible(&type1->array, &type2->array);
1032
1033         case TYPE_POINTER: {
1034                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
1035                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
1036                 return types_compatible(to1, to2);
1037         }
1038
1039         case TYPE_COMPOUND_STRUCT:
1040         case TYPE_COMPOUND_UNION:
1041         case TYPE_ENUM:
1042         case TYPE_BUILTIN:
1043                 /* TODO: not implemented */
1044                 break;
1045
1046         case TYPE_BITFIELD:
1047                 /* not sure if this makes sense or is even needed, implement it if you
1048                  * really need it! */
1049                 panic("type compatibility check for bitfield type");
1050
1051         case TYPE_ERROR:
1052                 /* Hmm, the error type should be compatible to all other types */
1053                 return true;
1054         case TYPE_INVALID:
1055                 panic("invalid type found in compatible types");
1056         case TYPE_TYPEDEF:
1057         case TYPE_TYPEOF:
1058                 panic("typerefs not skipped in compatible types?!?");
1059         }
1060
1061         /* TODO: incomplete */
1062         return false;
1063 }
1064
1065 /**
1066  * Skip all typerefs and return the underlying type.
1067  */
1068 type_t *skip_typeref(type_t *type)
1069 {
1070         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1071         type_modifiers_t  modifiers  = TYPE_MODIFIER_NONE;
1072
1073         while(true) {
1074                 switch(type->kind) {
1075                 case TYPE_ERROR:
1076                         return type;
1077                 case TYPE_TYPEDEF: {
1078                         qualifiers |= type->base.qualifiers;
1079                         modifiers  |= type->base.modifiers;
1080                         const typedef_type_t *typedef_type = &type->typedeft;
1081                         if (typedef_type->resolved_type != NULL) {
1082                                 type = typedef_type->resolved_type;
1083                                 break;
1084                         }
1085                         type = typedef_type->declaration->type;
1086                         continue;
1087                 }
1088                 case TYPE_TYPEOF: {
1089                         const typeof_type_t *typeof_type = &type->typeoft;
1090                         if (typeof_type->typeof_type != NULL) {
1091                                 type = typeof_type->typeof_type;
1092                         } else {
1093                                 type = typeof_type->expression->base.type;
1094                         }
1095                         continue;
1096                 }
1097                 default:
1098                         break;
1099                 }
1100                 break;
1101         }
1102
1103         if (qualifiers != TYPE_QUALIFIER_NONE || modifiers != TYPE_MODIFIER_NONE) {
1104                 type_t *const copy = duplicate_type(type);
1105
1106                 /* for const with typedefed array type the element type has to be
1107                  * adjusted */
1108                 if (is_type_array(copy)) {
1109                         type_t *element_type           = copy->array.element_type;
1110                         element_type                   = duplicate_type(element_type);
1111                         element_type->base.qualifiers |= qualifiers;
1112                         element_type->base.modifiers  |= modifiers;
1113                         copy->array.element_type       = element_type;
1114                 } else {
1115                         copy->base.qualifiers |= qualifiers;
1116                         copy->base.modifiers  |= modifiers;
1117                 }
1118
1119                 type = typehash_insert(copy);
1120                 if (type != copy) {
1121                         obstack_free(type_obst, copy);
1122                 }
1123         }
1124
1125         return type;
1126 }
1127
1128 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1129 {
1130         assert(kind <= ATOMIC_TYPE_LAST);
1131         return atomic_type_properties[kind].size;
1132 }
1133
1134 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1135 {
1136         assert(kind <= ATOMIC_TYPE_LAST);
1137         return atomic_type_properties[kind].alignment;
1138 }
1139
1140 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1141 {
1142         assert(kind <= ATOMIC_TYPE_LAST);
1143         return atomic_type_properties[kind].flags;
1144 }
1145
1146 atomic_type_kind_t get_intptr_kind(void)
1147 {
1148         if (machine_size <= 32)
1149                 return ATOMIC_TYPE_INT;
1150         else if (machine_size <= 64)
1151                 return ATOMIC_TYPE_LONG;
1152         else
1153                 return ATOMIC_TYPE_LONGLONG;
1154 }
1155
1156 atomic_type_kind_t get_uintptr_kind(void)
1157 {
1158         if (machine_size <= 32)
1159                 return ATOMIC_TYPE_UINT;
1160         else if (machine_size <= 64)
1161                 return ATOMIC_TYPE_ULONG;
1162         else
1163                 return ATOMIC_TYPE_ULONGLONG;
1164 }
1165
1166 /**
1167  * Find the atomic type kind representing a given size (signed).
1168  */
1169 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size) {
1170         static atomic_type_kind_t kinds[32];
1171
1172         assert(size < 32);
1173         atomic_type_kind_t kind = kinds[size];
1174         if (kind == ATOMIC_TYPE_INVALID) {
1175                 static const atomic_type_kind_t possible_kinds[] = {
1176                         ATOMIC_TYPE_SCHAR,
1177                         ATOMIC_TYPE_SHORT,
1178                         ATOMIC_TYPE_INT,
1179                         ATOMIC_TYPE_LONG,
1180                         ATOMIC_TYPE_LONGLONG
1181                 };
1182                 for(unsigned i = 0; i < sizeof(possible_kinds)/sizeof(possible_kinds[0]); ++i) {
1183                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1184                                 kind = possible_kinds[i];
1185                                 break;
1186                         }
1187                 }
1188                 kinds[size] = kind;
1189         }
1190         return kind;
1191 }
1192
1193 /**
1194  * Find the atomic type kind representing a given size (signed).
1195  */
1196 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size) {
1197         static atomic_type_kind_t kinds[32];
1198
1199         assert(size < 32);
1200         atomic_type_kind_t kind = kinds[size];
1201         if (kind == ATOMIC_TYPE_INVALID) {
1202                 static const atomic_type_kind_t possible_kinds[] = {
1203                         ATOMIC_TYPE_UCHAR,
1204                         ATOMIC_TYPE_USHORT,
1205                         ATOMIC_TYPE_UINT,
1206                         ATOMIC_TYPE_ULONG,
1207                         ATOMIC_TYPE_ULONGLONG
1208                 };
1209                 for(unsigned i = 0; i < sizeof(possible_kinds)/sizeof(possible_kinds[0]); ++i) {
1210                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1211                                 kind = possible_kinds[i];
1212                                 break;
1213                         }
1214                 }
1215                 kinds[size] = kind;
1216         }
1217         return kind;
1218 }
1219
1220 /**
1221  * Hash the given type and return the "singleton" version
1222  * of it.
1223  */
1224 static type_t *identify_new_type(type_t *type)
1225 {
1226         type_t *result = typehash_insert(type);
1227         if (result != type) {
1228                 obstack_free(type_obst, type);
1229         }
1230         return result;
1231 }
1232
1233 /**
1234  * Creates a new atomic type.
1235  *
1236  * @param akind       The kind of the atomic type.
1237  * @param qualifiers  Type qualifiers for the new type.
1238  */
1239 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1240 {
1241         type_t *type = obstack_alloc(type_obst, sizeof(atomic_type_t));
1242         memset(type, 0, sizeof(atomic_type_t));
1243
1244         type->kind            = TYPE_ATOMIC;
1245         type->base.qualifiers = qualifiers;
1246         type->base.alignment  = get_atomic_type_alignment(akind);
1247         type->atomic.akind    = akind;
1248
1249         return identify_new_type(type);
1250 }
1251
1252 /**
1253  * Creates a new complex type.
1254  *
1255  * @param akind       The kind of the atomic type.
1256  * @param qualifiers  Type qualifiers for the new type.
1257  */
1258 type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1259 {
1260         type_t *type = obstack_alloc(type_obst, sizeof(complex_type_t));
1261         memset(type, 0, sizeof(complex_type_t));
1262
1263         type->kind            = TYPE_COMPLEX;
1264         type->base.qualifiers = qualifiers;
1265         type->base.alignment  = get_atomic_type_alignment(akind);
1266         type->complex.akind   = akind;
1267
1268         return identify_new_type(type);
1269 }
1270
1271 /**
1272  * Creates a new imaginary type.
1273  *
1274  * @param akind       The kind of the atomic type.
1275  * @param qualifiers  Type qualifiers for the new type.
1276  */
1277 type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1278 {
1279         type_t *type = obstack_alloc(type_obst, sizeof(imaginary_type_t));
1280         memset(type, 0, sizeof(imaginary_type_t));
1281
1282         type->kind            = TYPE_IMAGINARY;
1283         type->base.qualifiers = qualifiers;
1284         type->base.alignment  = get_atomic_type_alignment(akind);
1285         type->imaginary.akind = akind;
1286
1287         return identify_new_type(type);
1288 }
1289
1290 /**
1291  * Creates a new pointer type.
1292  *
1293  * @param points_to   The points-to type for the new type.
1294  * @param qualifiers  Type qualifiers for the new type.
1295  */
1296 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1297 {
1298         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1299         memset(type, 0, sizeof(pointer_type_t));
1300
1301         type->kind              = TYPE_POINTER;
1302         type->base.qualifiers   = qualifiers;
1303         type->base.alignment    = 0;
1304         type->pointer.points_to = points_to;
1305
1306         return identify_new_type(type);
1307 }
1308
1309 type_t *make_array_type(type_t *element_type, size_t size,
1310                         type_qualifiers_t qualifiers)
1311 {
1312         type_t *type = obstack_alloc(type_obst, sizeof(array_type_t));
1313         memset(type, 0, sizeof(array_type_t));
1314
1315         type->kind                = TYPE_ARRAY;
1316         type->base.qualifiers     = qualifiers;
1317         type->base.alignment      = 0;
1318         type->array.element_type  = element_type;
1319         type->array.size          = size;
1320         type->array.size_constant = true;
1321
1322         return identify_new_type(type);
1323 }
1324
1325 /**
1326  * Debug helper. Prints the given type to stdout.
1327  */
1328 static __attribute__((unused))
1329 void dbg_type(const type_t *type)
1330 {
1331         FILE *old_out = out;
1332         out = stderr;
1333         print_type(type);
1334         puts("\n");
1335         fflush(stderr);
1336         out = old_out;
1337 }