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