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