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