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