nsz Git - cparser/blob - type_hash.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 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->modifiers;
 105         result += type->linkage;
 106         result += type->calling_convention;
 107
 108         return result;
 109 }
 110
 111 static unsigned hash_enum_type(const enum_type_t *type)
 112 {
 113         return hash_ptr(type->enume);
 114 }
 115
 116 static unsigned hash_typeof_type(const typeof_type_t *type)
 117 {
 118         unsigned result = hash_ptr(type->expression);
 119         result         ^= hash_ptr(type->typeof_type);
 120
 121         return result;
 122 }
 123
 124 static unsigned hash_type(const type_t *type)
 125 {
 126         unsigned hash = 0;
 127
 128         switch (type->kind) {
 129         case TYPE_ERROR:
 130                 return 0;
 131         case TYPE_ATOMIC:
 132                 hash = hash_atomic_type(&type->atomic);
 133                 break;
 134         case TYPE_COMPLEX:
 135                 hash = hash_complex_type(&type->complex);
 136                 break;
 137         case TYPE_IMAGINARY:
 138                 hash = hash_imaginary_type(&type->imaginary);
 139                 break;
 140         case TYPE_ENUM:
 141                 hash = hash_enum_type(&type->enumt);
 142                 break;
 143         case TYPE_COMPOUND_STRUCT:
 144         case TYPE_COMPOUND_UNION:
 145                 hash = hash_compound_type(&type->compound);
 146                 break;
 147         case TYPE_FUNCTION:
 148                 hash = hash_function_type(&type->function);
 149                 break;
 150         case TYPE_POINTER:
 151                 hash = hash_pointer_type(&type->pointer);
 152                 break;
 153         case TYPE_REFERENCE:
 154                 hash = hash_reference_type(&type->reference);
 155                 break;
 156         case TYPE_ARRAY:
 157                 hash = hash_array_type(&type->array);
 158                 break;
 159         case TYPE_TYPEDEF:
 160                 hash = hash_ptr(type->typedeft.typedefe);
 161                 break;
 162         case TYPE_TYPEOF:
 163                 hash = hash_typeof_type(&type->typeoft);
 164                 break;
 165         }
 166
 167         unsigned some_prime = 99991;
 168         hash ^= some_prime * type->base.qualifiers;
 169
 170         return hash;
 171 }
 172
 173 static bool atomic_types_equal(const atomic_type_t *type1,
 174                                                            const atomic_type_t *type2)
 175 {
 176         return type1->akind == type2->akind;
 177 }
 178
 179 static bool complex_types_equal(const complex_type_t *type1,
 180                                                             const complex_type_t *type2)
 181 {
 182         return type1->akind == type2->akind;
 183 }
 184
 185 static bool imaginary_types_equal(const imaginary_type_t *type1,
 186                                                               const imaginary_type_t *type2)
 187 {
 188         return type1->akind == type2->akind;
 189 }
 190
 191 static bool function_types_equal(const function_type_t *type1,
 192                                  const function_type_t *type2)
 193 {
 194         if (type1->return_type != type2->return_type)
 195                 return false;
 196         if (type1->variadic != type2->variadic)
 197                 return false;
 198         if (type1->unspecified_parameters != type2->unspecified_parameters)
 199                 return false;
 200         if (type1->kr_style_parameters != type2->kr_style_parameters)
 201                 return false;
 202         if (type1->linkage != type2->linkage)
 203                 return false;
 204         if (type1->modifiers != type2->modifiers)
 205                 return false;
 206         if (type1->calling_convention != type2->calling_convention)
 207                 return false;
 208
 209         function_parameter_t *param1 = type1->parameters;
 210         function_parameter_t *param2 = type2->parameters;
 211         while (param1 != NULL && param2 != NULL) {
 212                 if (param1->type != param2->type)
 213                         return false;
 214                 param1 = param1->next;
 215                 param2 = param2->next;
 216         }
 217         if (param1 != NULL || param2 != NULL)
 218                 return false;
 219
 220         return true;
 221 }
 222
 223 static bool pointer_types_equal(const pointer_type_t *type1,
 224                                 const pointer_type_t *type2)
 225 {
 226         return type1->points_to     == type2->points_to &&
 227                type1->base_variable == type2->base_variable;
 228 }
 229
 230 static bool reference_types_equal(const reference_type_t *type1,
 231                                   const reference_type_t *type2)
 232 {
 233         return type1->refers_to == type2->refers_to;
 234 }
 235
 236 static bool array_types_equal(const array_type_t *type1,
 237                               const array_type_t *type2)
 238 {
 239         if (type1->element_type != type2->element_type)
 240                 return false;
 241         if (type1->is_variable != type2->is_variable)
 242                 return false;
 243         if (type1->is_static != type2->is_static)
 244                 return false;
 245         if (type1->size_constant != type2->size_constant)
 246                 return false;
 247
 248         /* never identify vla types, because we need them for caching calculated
 249          * sizes later in ast2firm */
 250         if (type1->is_vla || type2->is_vla)
 251                 return false;
 252
 253         /* TODO: compare size expressions for equality... */
 254
 255         return false;
 256 }
 257
 258 static bool compound_types_equal(const compound_type_t *type1,
 259                                  const compound_type_t *type2)
 260 {
 261         return type1->compound == type2->compound;
 262 }
 263
 264 static bool enum_types_equal(const enum_type_t *type1,
 265                              const enum_type_t *type2)
 266 {
 267         return type1->enume == type2->enume;
 268 }
 269
 270 static bool typedef_types_equal(const typedef_type_t *type1,
 271                                 const typedef_type_t *type2)
 272 {
 273         return type1->typedefe == type2->typedefe;
 274 }
 275
 276 static bool typeof_types_equal(const typeof_type_t *type1,
 277                                const typeof_type_t *type2)
 278 {
 279         if (type1->expression != type2->expression)
 280                 return false;
 281         if (type1->typeof_type != type2->typeof_type)
 282                 return false;
 283
 284         return true;
 285 }
 286
 287 static bool types_equal(const type_t *type1, const type_t *type2)
 288 {
 289         if (type1 == type2)
 290                 return true;
 291         if (type1->kind != type2->kind)
 292                 return false;
 293         if (type1->base.qualifiers != type2->base.qualifiers)
 294                 return false;
 295
 296         switch (type1->kind) {
 297         case TYPE_ERROR:
 298                 /* Hmm, the error type is never equal */
 299                 return false;
 300         case TYPE_ATOMIC:
 301                 return atomic_types_equal(&type1->atomic, &type2->atomic);
 302         case TYPE_COMPLEX:
 303                 return complex_types_equal(&type1->complex, &type2->complex);
 304         case TYPE_IMAGINARY:
 305                 return imaginary_types_equal(&type1->imaginary, &type2->imaginary);
 306         case TYPE_ENUM:
 307                 return enum_types_equal(&type1->enumt, &type2->enumt);
 308         case TYPE_COMPOUND_STRUCT:
 309         case TYPE_COMPOUND_UNION:
 310                 return compound_types_equal(&type1->compound, &type2->compound);
 311         case TYPE_FUNCTION:
 312                 return function_types_equal(&type1->function, &type2->function);
 313         case TYPE_POINTER:
 314                 return pointer_types_equal(&type1->pointer, &type2->pointer);
 315         case TYPE_REFERENCE:
 316                 return reference_types_equal(&type1->reference, &type2->reference);
 317         case TYPE_ARRAY:
 318                 return array_types_equal(&type1->array, &type2->array);
 319         case TYPE_TYPEOF:
 320                 return typeof_types_equal(&type1->typeoft, &type2->typeoft);
 321         case TYPE_TYPEDEF:
 322                 return typedef_types_equal(&type1->typedeft, &type2->typedeft);
 323         }
 324
 325         abort();
 326 }
 327
 328 #define HashSet                    type_hash_t
 329 #define HashSetIterator            type_hash_iterator_t
 330 #define ValueType                  type_t*
 331 #define NullValue                  NULL
 332 #define DeletedValue               ((type_t*)-1)
 333 #define Hash(this, key)            hash_type(key)
 334 #define KeysEqual(this,key1,key2)  types_equal(key1, key2)
 335 #define SetRangeEmpty(ptr,size)    memset(ptr, 0, (size) * sizeof(*(ptr)))
 336
 337 #define hashset_init             _typehash_init
 338 #define hashset_init_size        _typehash_init_size
 339 #define hashset_destroy          _typehash_destroy
 340 #define hashset_insert           _typehash_insert
 341 #define hashset_remove           typehash_remove
 342 #define hashset_find             typehash_find
 343 #define hashset_size             typehash_size
 344 #define hashset_iterator_init    typehash_iterator_init
 345 #define hashset_iterator_next    typehash_iterator_next
 346 #define hashset_remove_iterator  typehash_remove_iterator
 347 #define SCALAR_RETURN
 348
 349 #include "adt/hashset.c"
 350
 351 static type_hash_t typehash;
 352
 353 void init_typehash(void)
 354 {
 355         _typehash_init(&typehash);
 356 }
 357
 358 void exit_typehash(void)
 359 {
 360         _typehash_destroy(&typehash);
 361 }
 362
 363 type_t *typehash_insert(type_t *type)
 364 {
 365         return _typehash_insert(&typehash, type);
 366 }