nsz Git - cparser/blob - type_hash.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 <stdbool.h>
  23
  24 #include "type_hash.h"
  25
  26 #include "adt/error.h"
  27 #include "type_t.h"
  28
  29 #include <assert.h>
  30
  31 #define HashSet         type_hash_t
  32 #define HashSetIterator type_hash_iterator_t
  33 #define ValueType       type_t*
  34 #include "adt/hashset.h"
  35 #undef ValueType
  36 #undef HashSetIterator
  37 #undef HashSet
  38
  39 typedef struct type_hash_iterator_t  type_hash_iterator_t;
  40 typedef struct type_hash_t           type_hash_t;
  41
  42 /* TODO: ^= is a bad way of combining hashes since most addresses are very
  43  * similar */
  44
  45 static unsigned hash_ptr(const void *ptr)
  46 {
  47         unsigned ptr_int = ((char*) ptr - (char*) NULL);
  48         return ptr_int >> 3;
  49 }
  50
  51 static unsigned hash_atomic_type(const atomic_type_t *type)
  52 {
  53         unsigned some_prime = 27644437;
  54         unsigned result     = type->akind * some_prime;
  55
  56         return result;
  57 }
  58
  59 static unsigned hash_complex_type(const complex_type_t *type)
  60 {
  61         unsigned some_prime = 27644437;
  62         unsigned result     = type->akind * some_prime;
  63
  64         return result;
  65 }
  66
  67 static unsigned hash_imaginary_type(const imaginary_type_t *type)
  68 {
  69         unsigned some_prime = 27644437;
  70         unsigned result     = type->akind * some_prime;
  71
  72         return result;
  73 }
  74
  75 static unsigned hash_pointer_type(const pointer_type_t *type)
  76 {
  77         return hash_ptr(type->points_to) ^ hash_ptr(type->base_variable);
  78 }
  79
  80 static unsigned hash_reference_type(const reference_type_t *type)
  81 {
  82         return hash_ptr(type->refers_to);
  83 }
  84
  85 static unsigned hash_array_type(const array_type_t *type)
  86 {
  87         return hash_ptr(type->element_type);
  88 }
  89
  90 static unsigned hash_compound_type(const compound_type_t *type)
  91 {
  92         return hash_ptr(type->compound);
  93 }
  94
  95 static unsigned hash_type(const type_t *type);
  96
  97 static unsigned hash_function_type(const function_type_t *type)
  98 {
  99         unsigned result = hash_ptr(type->return_type);
 100
 101         function_parameter_t *parameter = type->parameters;
 102         while (parameter != NULL) {
 103                 result   ^= hash_ptr(parameter->type);
 104                 parameter = parameter->next;
 105         }
 106         result += type->linkage;
 107         result += type->calling_convention;
 108
 109         return result;
 110 }
 111
 112 static unsigned hash_enum_type(const enum_type_t *type)
 113 {
 114         return hash_ptr(type->enume);
 115 }
 116
 117 static unsigned hash_typeof_type(const typeof_type_t *type)
 118 {
 119         unsigned result = hash_ptr(type->expression);
 120         result         ^= hash_ptr(type->typeof_type);
 121
 122         return result;
 123 }
 124
 125 static unsigned hash_bitfield_type(const bitfield_type_t *type)
 126 {
 127         unsigned result  = hash_ptr(type->base_type);
 128         result          ^= 27172145;
 129
 130         return result;
 131 }
 132
 133 static unsigned hash_type(const type_t *type)
 134 {
 135         unsigned hash = 0;
 136
 137         switch (type->kind) {
 138         case TYPE_INVALID:
 139                 panic("internalizing void or invalid types not possible");
 140         case TYPE_ERROR:
 141                 return 0;
 142         case TYPE_ATOMIC:
 143                 hash = hash_atomic_type(&type->atomic);
 144                 break;
 145         case TYPE_COMPLEX:
 146                 hash = hash_complex_type(&type->complex);
 147                 break;
 148         case TYPE_IMAGINARY:
 149                 hash = hash_imaginary_type(&type->imaginary);
 150                 break;
 151         case TYPE_ENUM:
 152                 hash = hash_enum_type(&type->enumt);
 153                 break;
 154         case TYPE_COMPOUND_STRUCT:
 155         case TYPE_COMPOUND_UNION:
 156                 hash = hash_compound_type(&type->compound);
 157                 break;
 158         case TYPE_FUNCTION:
 159                 hash = hash_function_type(&type->function);
 160                 break;
 161         case TYPE_POINTER:
 162                 hash = hash_pointer_type(&type->pointer);
 163                 break;
 164         case TYPE_REFERENCE:
 165                 hash = hash_reference_type(&type->reference);
 166                 break;
 167         case TYPE_ARRAY:
 168                 hash = hash_array_type(&type->array);
 169                 break;
 170         case TYPE_BUILTIN:
 171                 hash = hash_ptr(type->builtin.symbol);
 172                 break;
 173         case TYPE_TYPEDEF:
 174                 hash = hash_ptr(type->typedeft.typedefe);
 175                 break;
 176         case TYPE_TYPEOF:
 177                 hash = hash_typeof_type(&type->typeoft);
 178                 break;
 179         case TYPE_BITFIELD:
 180                 hash = hash_bitfield_type(&type->bitfield);
 181                 break;
 182         }
 183
 184         unsigned some_prime = 99991;
 185         hash ^= some_prime * type->base.qualifiers;
 186
 187         return hash;
 188 }
 189
 190 static bool atomic_types_equal(const atomic_type_t *type1,
 191                                                            const atomic_type_t *type2)
 192 {
 193         return type1->akind == type2->akind;
 194 }
 195
 196 static bool complex_types_equal(const complex_type_t *type1,
 197                                                             const complex_type_t *type2)
 198 {
 199         return type1->akind == type2->akind;
 200 }
 201
 202 static bool imaginary_types_equal(const imaginary_type_t *type1,
 203                                                               const imaginary_type_t *type2)
 204 {
 205         return type1->akind == type2->akind;
 206 }
 207
 208 static bool function_types_equal(const function_type_t *type1,
 209                                  const function_type_t *type2)
 210 {
 211         if (type1->return_type != type2->return_type)
 212                 return false;
 213         if (type1->variadic != type2->variadic)
 214                 return false;
 215         if (type1->unspecified_parameters != type2->unspecified_parameters)
 216                 return false;
 217         if (type1->kr_style_parameters != type2->kr_style_parameters)
 218                 return false;
 219         if (type1->linkage != type2->linkage)
 220                 return false;
 221         if (type1->calling_convention != type2->calling_convention)
 222                 return false;
 223
 224         function_parameter_t *param1 = type1->parameters;
 225         function_parameter_t *param2 = type2->parameters;
 226         while (param1 != NULL && param2 != NULL) {
 227                 if (param1->type != param2->type)
 228                         return false;
 229                 param1 = param1->next;
 230                 param2 = param2->next;
 231         }
 232         if (param1 != NULL || param2 != NULL)
 233                 return false;
 234
 235         return true;
 236 }
 237
 238 static bool pointer_types_equal(const pointer_type_t *type1,
 239                                 const pointer_type_t *type2)
 240 {
 241         return type1->points_to     == type2->points_to &&
 242                type1->base_variable == type2->base_variable;
 243 }
 244
 245 static bool reference_types_equal(const reference_type_t *type1,
 246                                   const reference_type_t *type2)
 247 {
 248         return type1->refers_to == type2->refers_to;
 249 }
 250
 251 static bool array_types_equal(const array_type_t *type1,
 252                               const array_type_t *type2)
 253 {
 254         if (type1->element_type != type2->element_type)
 255                 return false;
 256         if (type1->is_variable != type2->is_variable)
 257                 return false;
 258         if (type1->is_static != type2->is_static)
 259                 return false;
 260         if (type1->size_constant != type2->size_constant)
 261                 return false;
 262
 263         /* never identify vla types, because we need them for caching calculated
 264          * sizes later in ast2firm */
 265         if (type1->is_vla || type2->is_vla)
 266                 return false;
 267
 268         /* TODO: compare size expressions for equality... */
 269
 270         return false;
 271 }
 272
 273 static bool builtin_types_equal(const builtin_type_t *type1,
 274                                 const builtin_type_t *type2)
 275 {
 276         return type1->symbol == type2->symbol;
 277 }
 278
 279 static bool compound_types_equal(const compound_type_t *type1,
 280                                  const compound_type_t *type2)
 281 {
 282         return type1->compound == type2->compound;
 283 }
 284
 285 static bool enum_types_equal(const enum_type_t *type1,
 286                              const enum_type_t *type2)
 287 {
 288         return type1->enume == type2->enume;
 289 }
 290
 291 static bool typedef_types_equal(const typedef_type_t *type1,
 292                                 const typedef_type_t *type2)
 293 {
 294         return type1->typedefe == type2->typedefe;
 295 }
 296
 297 static bool typeof_types_equal(const typeof_type_t *type1,
 298                                const typeof_type_t *type2)
 299 {
 300         if (type1->expression != type2->expression)
 301                 return false;
 302         if (type1->typeof_type != type2->typeof_type)
 303                 return false;
 304
 305         return true;
 306 }
 307
 308 static bool bitfield_types_equal(const bitfield_type_t *type1,
 309                                  const bitfield_type_t *type2)
 310 {
 311         if (type1->base_type != type2->base_type)
 312                 return false;
 313         /* TODO: compare size expression */
 314         return false;
 315 }
 316
 317 static bool types_equal(const type_t *type1, const type_t *type2)
 318 {
 319         if (type1 == type2)
 320                 return true;
 321         if (type1->kind != type2->kind)
 322                 return false;
 323         if (type1->base.qualifiers != type2->base.qualifiers)
 324                 return false;
 325         if (type1->base.modifiers != type2->base.modifiers)
 326                 return false;
 327
 328         switch (type1->kind) {
 329         case TYPE_ERROR:
 330                 /* Hmm, the error type is never equal */
 331                 return false;
 332         case TYPE_INVALID:
 333                 return false;
 334         case TYPE_ATOMIC:
 335                 return atomic_types_equal(&type1->atomic, &type2->atomic);
 336         case TYPE_COMPLEX:
 337                 return complex_types_equal(&type1->complex, &type2->complex);
 338         case TYPE_IMAGINARY:
 339                 return imaginary_types_equal(&type1->imaginary, &type2->imaginary);
 340         case TYPE_ENUM:
 341                 return enum_types_equal(&type1->enumt, &type2->enumt);
 342         case TYPE_COMPOUND_STRUCT:
 343         case TYPE_COMPOUND_UNION:
 344                 return compound_types_equal(&type1->compound, &type2->compound);
 345         case TYPE_FUNCTION:
 346                 return function_types_equal(&type1->function, &type2->function);
 347         case TYPE_POINTER:
 348                 return pointer_types_equal(&type1->pointer, &type2->pointer);
 349         case TYPE_REFERENCE:
 350                 return reference_types_equal(&type1->reference, &type2->reference);
 351         case TYPE_ARRAY:
 352                 return array_types_equal(&type1->array, &type2->array);
 353         case TYPE_BUILTIN:
 354                 return builtin_types_equal(&type1->builtin, &type2->builtin);
 355         case TYPE_TYPEOF:
 356                 return typeof_types_equal(&type1->typeoft, &type2->typeoft);
 357         case TYPE_TYPEDEF:
 358                 return typedef_types_equal(&type1->typedeft, &type2->typedeft);
 359         case TYPE_BITFIELD:
 360                 return bitfield_types_equal(&type1->bitfield, &type2->bitfield);
 361         }
 362
 363         abort();
 364 }
 365
 366 #define HashSet                    type_hash_t
 367 #define HashSetIterator            type_hash_iterator_t
 368 #define ValueType                  type_t*
 369 #define NullValue                  NULL
 370 #define DeletedValue               ((type_t*)-1)
 371 #define Hash(this, key)            hash_type(key)
 372 #define KeysEqual(this,key1,key2)  types_equal(key1, key2)
 373 #define SetRangeEmpty(ptr,size)    memset(ptr, 0, (size) * sizeof(*(ptr)))
 374
 375 #define hashset_init             _typehash_init
 376 #define hashset_init_size        _typehash_init_size
 377 #define hashset_destroy          _typehash_destroy
 378 #define hashset_insert           _typehash_insert
 379 #define hashset_remove           typehash_remove
 380 #define hashset_find             typehash_find
 381 #define hashset_size             typehash_size
 382 #define hashset_iterator_init    typehash_iterator_init
 383 #define hashset_iterator_next    typehash_iterator_next
 384 #define hashset_remove_iterator  typehash_remove_iterator
 385 #define SCALAR_RETURN
 386
 387 #include "adt/hashset.c"
 388
 389 static type_hash_t typehash;
 390
 391 void init_typehash(void)
 392 {
 393         _typehash_init(&typehash);
 394 }
 395
 396 void exit_typehash(void)
 397 {
 398         _typehash_destroy(&typehash);
 399 }
 400
 401 type_t *typehash_insert(type_t *type)
 402 {
 403         return _typehash_insert(&typehash, type);
 404 }