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         case TYPE_INVALID:
 562                 fputs("<invalid>", out);
 563                 return;
 564         case TYPE_ENUM:
 565                 print_type_enum(&type->enumt);
 566                 return;
 567         case TYPE_ATOMIC:
 568                 print_atomic_type(&type->atomic);
 569                 return;
 570         case TYPE_COMPLEX:
 571                 print_complex_type(&type->complex);
 572                 return;
 573         case TYPE_IMAGINARY:
 574                 print_imaginary_type(&type->imaginary);
 575                 return;
 576         case TYPE_COMPOUND_STRUCT:
 577         case TYPE_COMPOUND_UNION:
 578                 print_compound_type(&type->compound);
 579                 return;
 580         case TYPE_BUILTIN:
 581                 fputs(type->builtin.symbol->string, out);
 582                 return;
 583         case TYPE_FUNCTION:
 584                 print_function_type_pre(&type->function, top);
 585                 return;
 586         case TYPE_POINTER:
 587                 print_pointer_type_pre(&type->pointer);
 588                 return;
 589         case TYPE_BITFIELD:
 590                 intern_print_type_pre(type->bitfield.base_type, top);
 591                 return;
 592         case TYPE_ARRAY:
 593                 print_array_type_pre(&type->array);
 594                 return;
 595         case TYPE_TYPEDEF:
 596                 print_typedef_type_pre(&type->typedeft);
 597                 return;
 598         case TYPE_TYPEOF:
 599                 print_typeof_type_pre(&type->typeoft);
 600                 return;
 601         }
 602         fputs("unknown", out);
 603 }
 604
 605 /**
 606  * Prints the postfix part of a type.
 607  *
 608  * @param type   The type.
 609  * @param top    true if we print the toplevel type, false else.
 610  */
 611 static void intern_print_type_post(const type_t *const type, const bool top)
 612 {
 613         switch(type->kind) {
 614         case TYPE_FUNCTION:
 615                 print_function_type_post(&type->function, NULL, top);
 616                 return;
 617         case TYPE_POINTER:
 618                 print_pointer_type_post(&type->pointer);
 619                 return;
 620         case TYPE_ARRAY:
 621                 print_array_type_post(&type->array);
 622                 return;
 623         case TYPE_BITFIELD:
 624                 print_bitfield_type_post(&type->bitfield);
 625                 return;
 626         case TYPE_ERROR:
 627         case TYPE_INVALID:
 628         case TYPE_ATOMIC:
 629         case TYPE_COMPLEX:
 630         case TYPE_IMAGINARY:
 631         case TYPE_ENUM:
 632         case TYPE_COMPOUND_STRUCT:
 633         case TYPE_COMPOUND_UNION:
 634         case TYPE_BUILTIN:
 635         case TYPE_TYPEOF:
 636         case TYPE_TYPEDEF:
 637                 break;
 638         }
 639 }
 640
 641 /**
 642  * Prints a type.
 643  *
 644  * @param type   The type.
 645  */
 646 void print_type(const type_t *const type)
 647 {
 648         print_type_ext(type, NULL, NULL);
 649 }
 650
 651 void print_type_ext(const type_t *const type, const symbol_t *symbol,
 652                     const scope_t *scope)
 653 {
 654         if (type == NULL) {
 655                 fputs("nil type", out);
 656                 return;
 657         }
 658
 659         intern_print_type_pre(type, true);
 660         if (symbol != NULL) {
 661                 fputc(' ', out);
 662                 fputs(symbol->string, out);
 663         }
 664         if (type->kind == TYPE_FUNCTION) {
 665                 print_function_type_post(&type->function, scope, true);
 666         } else {
 667                 intern_print_type_post(type, true);
 668         }
 669 }
 670
 671 /**
 672  * Return the size of a type AST node.
 673  *
 674  * @param type  The type.
 675  */
 676 static size_t get_type_size(const type_t *type)
 677 {
 678         switch(type->kind) {
 679         case TYPE_ATOMIC:          return sizeof(atomic_type_t);
 680         case TYPE_COMPLEX:         return sizeof(complex_type_t);
 681         case TYPE_IMAGINARY:       return sizeof(imaginary_type_t);
 682         case TYPE_COMPOUND_STRUCT:
 683         case TYPE_COMPOUND_UNION:  return sizeof(compound_type_t);
 684         case TYPE_ENUM:            return sizeof(enum_type_t);
 685         case TYPE_FUNCTION:        return sizeof(function_type_t);
 686         case TYPE_POINTER:         return sizeof(pointer_type_t);
 687         case TYPE_ARRAY:           return sizeof(array_type_t);
 688         case TYPE_BUILTIN:         return sizeof(builtin_type_t);
 689         case TYPE_TYPEDEF:         return sizeof(typedef_type_t);
 690         case TYPE_TYPEOF:          return sizeof(typeof_type_t);
 691         case TYPE_BITFIELD:        return sizeof(bitfield_type_t);
 692         case TYPE_ERROR:           panic("error type found");
 693         case TYPE_INVALID:         panic("invalid type found");
 694         }
 695         panic("unknown type found");
 696 }
 697
 698 /**
 699  * Duplicates a type.
 700  *
 701  * @param type  The type to copy.
 702  * @return A copy of the type.
 703  *
 704  * @note This does not produce a deep copy!
 705  */
 706 type_t *duplicate_type(const type_t *type)
 707 {
 708         size_t size = get_type_size(type);
 709
 710         type_t *copy = obstack_alloc(type_obst, size);
 711         memcpy(copy, type, size);
 712
 713         return copy;
 714 }
 715
 716 /**
 717  * Returns the unqualified type of a given type.
 718  *
 719  * @param type  The type.
 720  * @returns The unqualified type.
 721  */
 722 type_t *get_unqualified_type(type_t *type)
 723 {
 724         if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
 725                 return type;
 726
 727         type_t *unqualified_type          = duplicate_type(type);
 728         unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
 729
 730         type_t *result = typehash_insert(unqualified_type);
 731         if (result != unqualified_type) {
 732                 obstack_free(type_obst, unqualified_type);
 733         }
 734
 735         return result;
 736 }
 737
 738 /**
 739  * Check if a type is valid.
 740  *
 741  * @param type  The type to check.
 742  * @return true if type represents a valid type.
 743  */
 744 bool type_valid(const type_t *type)
 745 {
 746         return type->kind != TYPE_INVALID;
 747 }
 748
 749 static bool test_atomic_type_flag(atomic_type_kind_t kind,
 750                                   atomic_type_flag_t flag)
 751 {
 752         assert(kind <= ATOMIC_TYPE_LAST);
 753         return (atomic_type_properties[kind].flags & flag) != 0;
 754 }
 755
 756 /**
 757  * Returns true if the given type is an integer type.
 758  *
 759  * @param type  The type to check.
 760  * @return True if type is an integer type.
 761  */
 762 bool is_type_integer(const type_t *type)
 763 {
 764         assert(!is_typeref(type));
 765
 766         if (type->kind == TYPE_ENUM)
 767                 return true;
 768         if (type->kind == TYPE_BITFIELD)
 769                 return true;
 770
 771         if (type->kind != TYPE_ATOMIC)
 772                 return false;
 773
 774         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
 775 }
 776
 777 /**
 778  * Returns true if the given type is an enum type.
 779  *
 780  * @param type  The type to check.
 781  * @return True if type is an enum type.
 782  */
 783 bool is_type_enum(const type_t *type)
 784 {
 785         assert(!is_typeref(type));
 786         return type->kind == TYPE_ENUM;
 787 }
 788
 789 /**
 790  * Returns true if the given type is an floating point type.
 791  *
 792  * @param type  The type to check.
 793  * @return True if type is a floating point type.
 794  */
 795 bool is_type_float(const type_t *type)
 796 {
 797         assert(!is_typeref(type));
 798
 799         if (type->kind != TYPE_ATOMIC)
 800                 return false;
 801
 802         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
 803 }
 804
 805 /**
 806  * Returns true if the given type is a signed type.
 807  *
 808  * @param type  The type to check.
 809  * @return True if type is a signed type.
 810  */
 811 bool is_type_signed(const type_t *type)
 812 {
 813         assert(!is_typeref(type));
 814
 815         /* enum types are int for now */
 816         if (type->kind == TYPE_ENUM)
 817                 return true;
 818         if (type->kind == TYPE_BITFIELD)
 819                 return is_type_signed(type->bitfield.base_type);
 820
 821         if (type->kind != TYPE_ATOMIC)
 822                 return false;
 823
 824         return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
 825 }
 826
 827 /**
 828  * Returns true if the given type represents an arithmetic type.
 829  *
 830  * @param type  The type to check.
 831  * @return True if type represents an arithmetic type.
 832  */
 833 bool is_type_arithmetic(const type_t *type)
 834 {
 835         assert(!is_typeref(type));
 836
 837         switch(type->kind) {
 838         case TYPE_BITFIELD:
 839         case TYPE_ENUM:
 840                 return true;
 841         case TYPE_ATOMIC:
 842                 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 843         case TYPE_COMPLEX:
 844                 return test_atomic_type_flag(type->complex.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 845         case TYPE_IMAGINARY:
 846                 return test_atomic_type_flag(type->imaginary.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
 847         default:
 848                 return false;
 849         }
 850 }
 851
 852 /**
 853  * Returns true if the given type is an integer or float type.
 854  *
 855  * @param type  The type to check.
 856  * @return True if type is an integer or float type.
 857  */
 858 bool is_type_real(const type_t *type)
 859 {
 860         /* 6.2.5.17 */
 861         return is_type_integer(type)
 862                 || (type->kind == TYPE_ATOMIC && is_type_float(type));
 863 }
 864
 865 /**
 866  * Returns true if the given type represents a scalar type.
 867  *
 868  * @param type  The type to check.
 869  * @return True if type represents a scalar type.
 870  */
 871 bool is_type_scalar(const type_t *type)
 872 {
 873         assert(!is_typeref(type));
 874
 875         switch (type->kind) {
 876                 case TYPE_POINTER: return true;
 877                 case TYPE_BUILTIN: return is_type_scalar(type->builtin.real_type);
 878                 default:           break;
 879         }
 880
 881         return is_type_arithmetic(type);
 882 }
 883
 884 /**
 885  * Check if a given type is incomplete.
 886  *
 887  * @param type  The type to check.
 888  * @return True if the given type is incomplete (ie. just forward).
 889  */
 890 bool is_type_incomplete(const type_t *type)
 891 {
 892         assert(!is_typeref(type));
 893
 894         switch(type->kind) {
 895         case TYPE_COMPOUND_STRUCT:
 896         case TYPE_COMPOUND_UNION: {
 897                 const compound_type_t *compound_type = &type->compound;
 898                 declaration_t         *declaration   = compound_type->declaration;
 899                 return !declaration->init.complete;
 900         }
 901         case TYPE_ENUM: {
 902                 const enum_type_t *enum_type   = &type->enumt;
 903                 declaration_t     *declaration = enum_type->declaration;
 904                 return !declaration->init.complete;
 905         }
 906
 907         case TYPE_ARRAY:
 908                 return type->array.size_expression == NULL
 909                         && !type->array.size_constant;
 910
 911         case TYPE_ATOMIC:
 912                 return type->atomic.akind == ATOMIC_TYPE_VOID;
 913
 914         case TYPE_COMPLEX:
 915                 return type->complex.akind == ATOMIC_TYPE_VOID;
 916
 917         case TYPE_IMAGINARY:
 918                 return type->imaginary.akind == ATOMIC_TYPE_VOID;
 919
 920         case TYPE_BITFIELD:
 921         case TYPE_FUNCTION:
 922         case TYPE_POINTER:
 923         case TYPE_BUILTIN:
 924         case TYPE_ERROR:
 925                 return false;
 926
 927         case TYPE_TYPEDEF:
 928         case TYPE_TYPEOF:
 929                 panic("is_type_incomplete called without typerefs skipped");
 930         case TYPE_INVALID:
 931                 break;
 932         }
 933
 934         panic("invalid type found");
 935 }
 936
 937 bool is_type_object(const type_t *type)
 938 {
 939         return !is_type_function(type) && !is_type_incomplete(type);
 940 }
 941
 942 /**
 943  * Check if two function types are compatible.
 944  */
 945 static bool function_types_compatible(const function_type_t *func1,
 946                                       const function_type_t *func2)
 947 {
 948         const type_t* const ret1 = skip_typeref(func1->return_type);
 949         const type_t* const ret2 = skip_typeref(func2->return_type);
 950         if (!types_compatible(ret1, ret2))
 951                 return false;
 952
 953         /* can parameters be compared? */
 954         if (func1->unspecified_parameters || func2->unspecified_parameters)
 955                 return true;
 956
 957         if (func1->variadic != func2->variadic)
 958                 return false;
 959
 960         if (func1->calling_convention != func2->calling_convention)
 961                 return false;
 962
 963         /* TODO: handling of unspecified parameters not correct yet */
 964
 965         /* all argument types must be compatible */
 966         function_parameter_t *parameter1 = func1->parameters;
 967         function_parameter_t *parameter2 = func2->parameters;
 968         for ( ; parameter1 != NULL && parameter2 != NULL;
 969                         parameter1 = parameter1->next, parameter2 = parameter2->next) {
 970                 type_t *parameter1_type = skip_typeref(parameter1->type);
 971                 type_t *parameter2_type = skip_typeref(parameter2->type);
 972
 973                 parameter1_type = get_unqualified_type(parameter1_type);
 974                 parameter2_type = get_unqualified_type(parameter2_type);
 975
 976                 if (!types_compatible(parameter1_type, parameter2_type))
 977                         return false;
 978         }
 979         /* same number of arguments? */
 980         if (parameter1 != NULL || parameter2 != NULL)
 981                 return false;
 982
 983         return true;
 984 }
 985
 986 /**
 987  * Check if two array types are compatible.
 988  */
 989 static bool array_types_compatible(const array_type_t *array1,
 990                                    const array_type_t *array2)
 991 {
 992         type_t *element_type1 = skip_typeref(array1->element_type);
 993         type_t *element_type2 = skip_typeref(array2->element_type);
 994         if (!types_compatible(element_type1, element_type2))
 995                 return false;
 996
 997         if (!array1->size_constant || !array2->size_constant)
 998                 return true;
 999
1000         return array1->size == array2->size;
1001 }
1002
1003 /**
1004  * Check if two types are compatible.
1005  */
1006 bool types_compatible(const type_t *type1, const type_t *type2)
1007 {
1008         assert(!is_typeref(type1));
1009         assert(!is_typeref(type2));
1010
1011         /* shortcut: the same type is always compatible */
1012         if (type1 == type2)
1013                 return true;
1014
1015         if (type1->base.qualifiers != type2->base.qualifiers)
1016                 return false;
1017         if (type1->kind != type2->kind)
1018                 return false;
1019
1020         switch(type1->kind) {
1021         case TYPE_FUNCTION:
1022                 return function_types_compatible(&type1->function, &type2->function);
1023         case TYPE_ATOMIC:
1024                 return type1->atomic.akind == type2->atomic.akind;
1025         case TYPE_COMPLEX:
1026                 return type1->complex.akind == type2->complex.akind;
1027         case TYPE_IMAGINARY:
1028                 return type1->imaginary.akind == type2->imaginary.akind;
1029         case TYPE_ARRAY:
1030                 return array_types_compatible(&type1->array, &type2->array);
1031
1032         case TYPE_POINTER: {
1033                 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
1034                 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
1035                 return types_compatible(to1, to2);
1036         }
1037
1038         case TYPE_COMPOUND_STRUCT:
1039         case TYPE_COMPOUND_UNION:
1040         case TYPE_ENUM:
1041         case TYPE_BUILTIN:
1042                 /* TODO: not implemented */
1043                 break;
1044
1045         case TYPE_BITFIELD:
1046                 /* not sure if this makes sense or is even needed, implement it if you
1047                  * really need it! */
1048                 panic("type compatibility check for bitfield type");
1049
1050         case TYPE_ERROR:
1051                 /* Hmm, the error type should be compatible to all other types */
1052                 return true;
1053         case TYPE_INVALID:
1054                 panic("invalid type found in compatible types");
1055         case TYPE_TYPEDEF:
1056         case TYPE_TYPEOF:
1057                 panic("typerefs not skipped in compatible types?!?");
1058         }
1059
1060         /* TODO: incomplete */
1061         return false;
1062 }
1063
1064 /**
1065  * Skip all typerefs and return the underlying type.
1066  */
1067 type_t *skip_typeref(type_t *type)
1068 {
1069         type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1070         type_modifiers_t  modifiers  = TYPE_MODIFIER_NONE;
1071
1072         while(true) {
1073                 switch(type->kind) {
1074                 case TYPE_ERROR:
1075                         return type;
1076                 case TYPE_TYPEDEF: {
1077                         qualifiers |= type->base.qualifiers;
1078                         modifiers  |= type->base.modifiers;
1079                         const typedef_type_t *typedef_type = &type->typedeft;
1080                         if (typedef_type->resolved_type != NULL) {
1081                                 type = typedef_type->resolved_type;
1082                                 break;
1083                         }
1084                         type = typedef_type->declaration->type;
1085                         continue;
1086                 }
1087                 case TYPE_TYPEOF: {
1088                         const typeof_type_t *typeof_type = &type->typeoft;
1089                         if (typeof_type->typeof_type != NULL) {
1090                                 type = typeof_type->typeof_type;
1091                         } else {
1092                                 type = typeof_type->expression->base.type;
1093                         }
1094                         continue;
1095                 }
1096                 default:
1097                         break;
1098                 }
1099                 break;
1100         }
1101
1102         if (qualifiers != TYPE_QUALIFIER_NONE || modifiers != TYPE_MODIFIER_NONE) {
1103                 type_t *const copy = duplicate_type(type);
1104
1105                 /* for const with typedefed array type the element type has to be
1106                  * adjusted */
1107                 if (is_type_array(copy)) {
1108                         type_t *element_type           = copy->array.element_type;
1109                         element_type                   = duplicate_type(element_type);
1110                         element_type->base.qualifiers |= qualifiers;
1111                         element_type->base.modifiers  |= modifiers;
1112                         copy->array.element_type       = element_type;
1113                 } else {
1114                         copy->base.qualifiers |= qualifiers;
1115                         copy->base.modifiers  |= modifiers;
1116                 }
1117
1118                 type = typehash_insert(copy);
1119                 if (type != copy) {
1120                         obstack_free(type_obst, copy);
1121                 }
1122         }
1123
1124         return type;
1125 }
1126
1127 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1128 {
1129         assert(kind <= ATOMIC_TYPE_LAST);
1130         return atomic_type_properties[kind].size;
1131 }
1132
1133 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1134 {
1135         assert(kind <= ATOMIC_TYPE_LAST);
1136         return atomic_type_properties[kind].alignment;
1137 }
1138
1139 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1140 {
1141         assert(kind <= ATOMIC_TYPE_LAST);
1142         return atomic_type_properties[kind].flags;
1143 }
1144
1145 atomic_type_kind_t get_intptr_kind(void)
1146 {
1147         if (machine_size <= 32)
1148                 return ATOMIC_TYPE_INT;
1149         else if (machine_size <= 64)
1150                 return ATOMIC_TYPE_LONG;
1151         else
1152                 return ATOMIC_TYPE_LONGLONG;
1153 }
1154
1155 atomic_type_kind_t get_uintptr_kind(void)
1156 {
1157         if (machine_size <= 32)
1158                 return ATOMIC_TYPE_UINT;
1159         else if (machine_size <= 64)
1160                 return ATOMIC_TYPE_ULONG;
1161         else
1162                 return ATOMIC_TYPE_ULONGLONG;
1163 }
1164
1165 /**
1166  * Find the atomic type kind representing a given size (signed).
1167  */
1168 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size) {
1169         static atomic_type_kind_t kinds[32];
1170
1171         assert(size < 32);
1172         atomic_type_kind_t kind = kinds[size];
1173         if (kind == ATOMIC_TYPE_INVALID) {
1174                 static const atomic_type_kind_t possible_kinds[] = {
1175                         ATOMIC_TYPE_SCHAR,
1176                         ATOMIC_TYPE_SHORT,
1177                         ATOMIC_TYPE_INT,
1178                         ATOMIC_TYPE_LONG,
1179                         ATOMIC_TYPE_LONGLONG
1180                 };
1181                 for(unsigned i = 0; i < sizeof(possible_kinds)/sizeof(possible_kinds[0]); ++i) {
1182                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1183                                 kind = possible_kinds[i];
1184                                 break;
1185                         }
1186                 }
1187                 kinds[size] = kind;
1188         }
1189         return kind;
1190 }
1191
1192 /**
1193  * Find the atomic type kind representing a given size (signed).
1194  */
1195 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size) {
1196         static atomic_type_kind_t kinds[32];
1197
1198         assert(size < 32);
1199         atomic_type_kind_t kind = kinds[size];
1200         if (kind == ATOMIC_TYPE_INVALID) {
1201                 static const atomic_type_kind_t possible_kinds[] = {
1202                         ATOMIC_TYPE_UCHAR,
1203                         ATOMIC_TYPE_USHORT,
1204                         ATOMIC_TYPE_UINT,
1205                         ATOMIC_TYPE_ULONG,
1206                         ATOMIC_TYPE_ULONGLONG
1207                 };
1208                 for(unsigned i = 0; i < sizeof(possible_kinds)/sizeof(possible_kinds[0]); ++i) {
1209                         if (get_atomic_type_size(possible_kinds[i]) == size) {
1210                                 kind = possible_kinds[i];
1211                                 break;
1212                         }
1213                 }
1214                 kinds[size] = kind;
1215         }
1216         return kind;
1217 }
1218
1219 /**
1220  * Hash the given type and return the "singleton" version
1221  * of it.
1222  */
1223 static type_t *identify_new_type(type_t *type)
1224 {
1225         type_t *result = typehash_insert(type);
1226         if (result != type) {
1227                 obstack_free(type_obst, type);
1228         }
1229         return result;
1230 }
1231
1232 /**
1233  * Creates a new atomic type.
1234  *
1235  * @param akind       The kind of the atomic type.
1236  * @param qualifiers  Type qualifiers for the new type.
1237  */
1238 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1239 {
1240         type_t *type = obstack_alloc(type_obst, sizeof(atomic_type_t));
1241         memset(type, 0, sizeof(atomic_type_t));
1242
1243         type->kind            = TYPE_ATOMIC;
1244         type->base.qualifiers = qualifiers;
1245         type->base.alignment  = get_atomic_type_alignment(akind);
1246         type->atomic.akind    = akind;
1247
1248         return identify_new_type(type);
1249 }
1250
1251 /**
1252  * Creates a new complex type.
1253  *
1254  * @param akind       The kind of the atomic type.
1255  * @param qualifiers  Type qualifiers for the new type.
1256  */
1257 type_t *make_complex_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1258 {
1259         type_t *type = obstack_alloc(type_obst, sizeof(complex_type_t));
1260         memset(type, 0, sizeof(complex_type_t));
1261
1262         type->kind            = TYPE_COMPLEX;
1263         type->base.qualifiers = qualifiers;
1264         type->base.alignment  = get_atomic_type_alignment(akind);
1265         type->complex.akind   = akind;
1266
1267         return identify_new_type(type);
1268 }
1269
1270 /**
1271  * Creates a new imaginary type.
1272  *
1273  * @param akind       The kind of the atomic type.
1274  * @param qualifiers  Type qualifiers for the new type.
1275  */
1276 type_t *make_imaginary_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1277 {
1278         type_t *type = obstack_alloc(type_obst, sizeof(imaginary_type_t));
1279         memset(type, 0, sizeof(imaginary_type_t));
1280
1281         type->kind            = TYPE_IMAGINARY;
1282         type->base.qualifiers = qualifiers;
1283         type->base.alignment  = get_atomic_type_alignment(akind);
1284         type->imaginary.akind = akind;
1285
1286         return identify_new_type(type);
1287 }
1288
1289 /**
1290  * Creates a new pointer type.
1291  *
1292  * @param points_to   The points-to type for the new type.
1293  * @param qualifiers  Type qualifiers for the new type.
1294  */
1295 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1296 {
1297         type_t *type = obstack_alloc(type_obst, sizeof(pointer_type_t));
1298         memset(type, 0, sizeof(pointer_type_t));
1299
1300         type->kind              = TYPE_POINTER;
1301         type->base.qualifiers   = qualifiers;
1302         type->base.alignment    = 0;
1303         type->pointer.points_to = points_to;
1304
1305         return identify_new_type(type);
1306 }
1307
1308 type_t *make_array_type(type_t *element_type, size_t size,
1309                         type_qualifiers_t qualifiers)
1310 {
1311         type_t *type = obstack_alloc(type_obst, sizeof(array_type_t));
1312         memset(type, 0, sizeof(array_type_t));
1313
1314         type->kind                = TYPE_ARRAY;
1315         type->base.qualifiers     = qualifiers;
1316         type->base.alignment      = 0;
1317         type->array.element_type  = element_type;
1318         type->array.size          = size;
1319         type->array.size_constant = true;
1320
1321         return identify_new_type(type);
1322 }
1323
1324 /**
1325  * Debug helper. Prints the given type to stdout.
1326  */
1327 static __attribute__((unused))
1328 void dbg_type(const type_t *type)
1329 {
1330         FILE *old_out = out;
1331         out = stderr;
1332         print_type(type);
1333         puts("\n");
1334         fflush(stderr);
1335         out = old_out;
1336 }