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