mono/mini/type-checking.c

   1 /**
   2  * \file
   3  */
   4
   5 #include <config.h>
   6 #include <mono/utils/mono-compiler.h>
   7
   8 #ifndef DISABLE_JIT
   9
  10 #include "mini.h"
  11 #include "ir-emit.h"
  12 #include <mono/metadata/abi-details.h>
  13 #include <mono/metadata/class-abi-details.h>
  14
  15
  16 #define is_complex_isinst(klass) (mono_class_is_interface (klass) || m_class_get_rank (klass) || mono_class_is_nullable (klass) || mono_class_is_marshalbyref (klass) || mono_class_is_sealed (klass) || m_class_get_byval_arg (klass)->type == MONO_TYPE_VAR || m_class_get_byval_arg (klass)->type == MONO_TYPE_MVAR)
  17
  18 static int
  19 get_castclass_cache_idx (MonoCompile *cfg)
  20 {
  21         /* Each CASTCLASS_CACHE patch needs a unique index which identifies the call site */
  22         cfg->castclass_cache_index ++;
  23         return (cfg->method_index << 16) | cfg->castclass_cache_index;
  24 }
  25
  26 static void
  27 emit_cached_check_args (MonoCompile *cfg, MonoInst *obj, MonoClass *klass, int context_used, MonoInst *args[3])
  28 {
  29         args [0] = obj;
  30
  31         if (context_used) {
  32                 MonoInst *cache_ins;
  33
  34                 cache_ins = mini_emit_get_rgctx_klass (cfg, context_used, klass, MONO_RGCTX_INFO_CAST_CACHE);
  35
  36                 /* klass - it's the second element of the cache entry*/
  37                 EMIT_NEW_LOAD_MEMBASE (cfg, args [1], OP_LOAD_MEMBASE, alloc_preg (cfg), cache_ins->dreg, TARGET_SIZEOF_VOID_P);
  38
  39                 args [2] = cache_ins; /* cache */
  40         } else {
  41                 int idx;
  42
  43                 EMIT_NEW_CLASSCONST (cfg, args [1], klass); /* klass */
  44
  45                 idx = get_castclass_cache_idx (cfg); /* inline cache*/
  46                 args [2] = mini_emit_runtime_constant (cfg, MONO_PATCH_INFO_CASTCLASS_CACHE, GINT_TO_POINTER (idx));
  47         }
  48 }
  49
  50 static MonoInst*
  51 emit_isinst_with_cache (MonoCompile *cfg, MonoInst *obj, MonoClass *klass, int context_used)
  52 {
  53         MonoInst *args [3];
  54         MonoMethod *mono_isinst = mono_marshal_get_isinst_with_cache ();
  55
  56         emit_cached_check_args (cfg, obj, klass, context_used, args);
  57         return mono_emit_method_call (cfg, mono_isinst, args, NULL);
  58 }
  59
  60 static MonoInst*
  61 emit_castclass_with_cache_no_details (MonoCompile *cfg, MonoInst *obj, MonoClass *klass, int context_used)
  62 {
  63         MonoInst *args [3];
  64         MonoMethod *mono_castclass = mono_marshal_get_castclass_with_cache ();
  65         MonoInst *res;
  66
  67         emit_cached_check_args (cfg, obj, klass, context_used, args);
  68
  69         res = mono_emit_method_call (cfg, mono_castclass, args, NULL);
  70
  71         return res;
  72 }
  73
  74 static MonoInst*
  75 emit_castclass_with_cache (MonoCompile *cfg, MonoInst *obj, MonoClass *klass, int context_used)
  76 {
  77         MonoInst *args [3];
  78         MonoMethod *mono_castclass = mono_marshal_get_castclass_with_cache ();
  79         MonoInst *res;
  80
  81         emit_cached_check_args (cfg, obj, klass, context_used, args);
  82
  83         mini_save_cast_details (cfg, klass, args [0]->dreg, TRUE);
  84         res = mono_emit_method_call (cfg, mono_castclass, args, NULL);
  85         mini_reset_cast_details (cfg);
  86
  87         return res;
  88 }
  89
  90 static inline void
  91 mini_emit_class_check_inst (MonoCompile *cfg, int klass_reg, MonoClass *klass, MonoInst *klass_inst)
  92 {
  93         if (klass_inst) {
  94                 MONO_EMIT_NEW_BIALU (cfg, OP_COMPARE, -1, klass_reg, klass_inst->dreg);
  95         } else {
  96                 MonoInst *ins = mini_emit_runtime_constant (cfg, MONO_PATCH_INFO_CLASS, klass);
  97                 MONO_EMIT_NEW_BIALU (cfg, OP_COMPARE, -1, klass_reg, ins->dreg);
  98         }
  99         MONO_EMIT_NEW_COND_EXC (cfg, NE_UN, "InvalidCastException");
 100 }
 101
 102
 103 static void
 104 mini_emit_isninst_cast_inst (MonoCompile *cfg, int klass_reg, MonoClass *klass, MonoInst *klass_ins, MonoBasicBlock *false_target, MonoBasicBlock *true_target)
 105 {
 106         int idepth_reg = alloc_preg (cfg);
 107         int stypes_reg = alloc_preg (cfg);
 108         int stype = alloc_preg (cfg);
 109
 110         mono_class_setup_supertypes (klass);
 111
 112         if (m_class_get_idepth (klass) > MONO_DEFAULT_SUPERTABLE_SIZE) {
 113                 MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADU2_MEMBASE, idepth_reg, klass_reg, m_class_offsetof_idepth ());
 114                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, idepth_reg, m_class_get_idepth (klass));
 115                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBLT_UN, false_target);
 116         }
 117         MONO_EMIT_NEW_LOAD_MEMBASE (cfg, stypes_reg, klass_reg, m_class_offsetof_supertypes ());
 118         MONO_EMIT_NEW_LOAD_MEMBASE (cfg, stype, stypes_reg, ((m_class_get_idepth (klass) - 1) * TARGET_SIZEOF_VOID_P));
 119         if (klass_ins) {
 120                 MONO_EMIT_NEW_BIALU (cfg, OP_COMPARE, -1, stype, klass_ins->dreg);
 121         } else if (cfg->compile_aot) {
 122                 int const_reg = alloc_preg (cfg);
 123                 MONO_EMIT_NEW_CLASSCONST (cfg, const_reg, klass);
 124                 MONO_EMIT_NEW_BIALU (cfg, OP_COMPARE, -1, stype, const_reg);
 125         } else {
 126                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, stype, (gsize)klass);
 127         }
 128         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBEQ, true_target);
 129 }
 130
 131
 132 static void
 133 mini_emit_interface_bitmap_check (MonoCompile *cfg, int intf_bit_reg, int base_reg, int offset, MonoClass *klass)
 134 {
 135         int ibitmap_reg = alloc_preg (cfg);
 136 #ifdef COMPRESSED_INTERFACE_BITMAP
 137         MonoInst *args [2];
 138         MonoInst *res, *ins;
 139         NEW_LOAD_MEMBASE (cfg, ins, OP_LOAD_MEMBASE, ibitmap_reg, base_reg, offset);
 140         MONO_ADD_INS (cfg->cbb, ins);
 141         args [0] = ins;
 142         args [1] = mini_emit_runtime_constant (cfg, MONO_PATCH_INFO_IID, klass);
 143         res = mono_emit_jit_icall (cfg, mono_class_interface_match, args);
 144         MONO_EMIT_NEW_UNALU (cfg, OP_MOVE, intf_bit_reg, res->dreg);
 145 #else
 146         int ibitmap_byte_reg = alloc_preg (cfg);
 147
 148         MONO_EMIT_NEW_LOAD_MEMBASE (cfg, ibitmap_reg, base_reg, offset);
 149
 150         if (cfg->compile_aot) {
 151                 int iid_reg = alloc_preg (cfg);
 152                 int shifted_iid_reg = alloc_preg (cfg);
 153                 int ibitmap_byte_address_reg = alloc_preg (cfg);
 154                 int masked_iid_reg = alloc_preg (cfg);
 155                 int iid_one_bit_reg = alloc_preg (cfg);
 156                 int iid_bit_reg = alloc_preg (cfg);
 157                 MONO_EMIT_NEW_AOTCONST (cfg, iid_reg, klass, MONO_PATCH_INFO_IID);
 158                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_SHR_IMM, shifted_iid_reg, iid_reg, 3);
 159                 MONO_EMIT_NEW_BIALU (cfg, OP_PADD, ibitmap_byte_address_reg, ibitmap_reg, shifted_iid_reg);
 160                 MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADU1_MEMBASE, ibitmap_byte_reg, ibitmap_byte_address_reg, 0);
 161                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_IAND_IMM, masked_iid_reg, iid_reg, 7);
 162                 MONO_EMIT_NEW_ICONST (cfg, iid_one_bit_reg, 1);
 163                 MONO_EMIT_NEW_BIALU (cfg, OP_ISHL, iid_bit_reg, iid_one_bit_reg, masked_iid_reg);
 164                 MONO_EMIT_NEW_BIALU (cfg, OP_IAND, intf_bit_reg, ibitmap_byte_reg, iid_bit_reg);
 165         } else {
 166                 MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADI1_MEMBASE, ibitmap_byte_reg, ibitmap_reg, m_class_get_interface_id (klass) >> 3);
 167                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_AND_IMM, intf_bit_reg, ibitmap_byte_reg, 1 << (m_class_get_interface_id (klass) & 7));
 168         }
 169 #endif
 170 }
 171
 172 /*
 173  * Emit code which loads into "intf_bit_reg" a nonzero value if the MonoClass
 174  * stored in "klass_reg" implements the interface "klass".
 175  */
 176 static void
 177 mini_emit_load_intf_bit_reg_class (MonoCompile *cfg, int intf_bit_reg, int klass_reg, MonoClass *klass)
 178 {
 179         mini_emit_interface_bitmap_check (cfg, intf_bit_reg, klass_reg, m_class_offsetof_interface_bitmap (), klass);
 180 }
 181
 182 /*
 183  * Emit code which loads into "intf_bit_reg" a nonzero value if the MonoVTable
 184  * stored in "vtable_reg" implements the interface "klass".
 185  */
 186 static void
 187 mini_emit_load_intf_bit_reg_vtable (MonoCompile *cfg, int intf_bit_reg, int vtable_reg, MonoClass *klass)
 188 {
 189         mini_emit_interface_bitmap_check (cfg, intf_bit_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, interface_bitmap), klass);
 190 }
 191
 192 /*
 193  * Emit code which checks whenever the interface id of @klass is smaller than
 194  * than the value given by max_iid_reg.
 195 */
 196 static void
 197 mini_emit_max_iid_check (MonoCompile *cfg, int max_iid_reg, MonoClass *klass,
 198                                                  MonoBasicBlock *false_target)
 199 {
 200         if (cfg->compile_aot) {
 201                 int iid_reg = alloc_preg (cfg);
 202                 MONO_EMIT_NEW_AOTCONST (cfg, iid_reg, klass, MONO_PATCH_INFO_IID);
 203                 MONO_EMIT_NEW_BIALU (cfg, OP_COMPARE, -1, max_iid_reg, iid_reg);
 204         }
 205         else
 206                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, max_iid_reg, m_class_get_interface_id (klass));
 207         if (false_target)
 208                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBLT_UN, false_target);
 209         else
 210                 MONO_EMIT_NEW_COND_EXC (cfg, LT_UN, "InvalidCastException");
 211 }
 212
 213 /* Same as above, but obtains max_iid from a vtable */
 214 static void
 215 mini_emit_max_iid_check_vtable (MonoCompile *cfg, int vtable_reg, MonoClass *klass,
 216                                                                  MonoBasicBlock *false_target)
 217 {
 218         int max_iid_reg = alloc_preg (cfg);
 219
 220         MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADU4_MEMBASE, max_iid_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, max_interface_id));
 221         mini_emit_max_iid_check (cfg, max_iid_reg, klass, false_target);
 222 }
 223
 224 /* Same as above, but obtains max_iid from a klass */
 225 static void
 226 mini_emit_max_iid_check_class (MonoCompile *cfg, int klass_reg, MonoClass *klass,
 227                                                                  MonoBasicBlock *false_target)
 228 {
 229         int max_iid_reg = alloc_preg (cfg);
 230
 231         MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADU4_MEMBASE, max_iid_reg, klass_reg, m_class_offsetof_max_interface_id ());
 232         mini_emit_max_iid_check (cfg, max_iid_reg, klass, false_target);
 233 }
 234
 235 static inline void
 236 mini_emit_class_check_branch (MonoCompile *cfg, int klass_reg, MonoClass *klass, int branch_op, MonoBasicBlock *target)
 237 {
 238         if (cfg->compile_aot) {
 239                 int const_reg = alloc_preg (cfg);
 240                 MONO_EMIT_NEW_CLASSCONST (cfg, const_reg, klass);
 241                 MONO_EMIT_NEW_BIALU (cfg, OP_COMPARE, -1, klass_reg, const_reg);
 242         } else {
 243                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, klass_reg, (gsize)klass);
 244         }
 245         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, branch_op, target);
 246 }
 247
 248
 249 static void
 250 mini_emit_isninst_cast (MonoCompile *cfg, int klass_reg, MonoClass *klass, MonoBasicBlock *false_target, MonoBasicBlock *true_target)
 251 {
 252         mini_emit_isninst_cast_inst (cfg, klass_reg, klass, NULL, false_target, true_target);
 253 }
 254
 255 static void
 256 mini_emit_iface_cast (MonoCompile *cfg, int vtable_reg, MonoClass *klass, MonoBasicBlock *false_target, MonoBasicBlock *true_target)
 257 {
 258         int intf_reg = alloc_preg (cfg);
 259
 260         mini_emit_max_iid_check_vtable (cfg, vtable_reg, klass, false_target);
 261         mini_emit_load_intf_bit_reg_vtable (cfg, intf_reg, vtable_reg, klass);
 262         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, intf_reg, 0);
 263         if (true_target)
 264                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBNE_UN, true_target);
 265         else
 266                 MONO_EMIT_NEW_COND_EXC (cfg, EQ, "InvalidCastException");
 267 }
 268
 269 /*
 270  * Variant of the above that takes a register to the class, not the vtable.
 271  */
 272 static void
 273 mini_emit_iface_class_cast (MonoCompile *cfg, int klass_reg, MonoClass *klass, MonoBasicBlock *false_target, MonoBasicBlock *true_target)
 274 {
 275         int intf_bit_reg = alloc_preg (cfg);
 276
 277         mini_emit_max_iid_check_class (cfg, klass_reg, klass, false_target);
 278         mini_emit_load_intf_bit_reg_class (cfg, intf_bit_reg, klass_reg, klass);
 279         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, intf_bit_reg, 0);
 280         if (true_target)
 281                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBNE_UN, true_target);
 282         else
 283                 MONO_EMIT_NEW_COND_EXC (cfg, EQ, "InvalidCastException");
 284 }
 285
 286
 287 static void
 288 mini_emit_castclass (MonoCompile *cfg, int obj_reg, int klass_reg, MonoClass *klass, MonoBasicBlock *object_is_null);
 289
 290 static void
 291 mini_emit_castclass_inst (MonoCompile *cfg, int obj_reg, int klass_reg, MonoClass *klass, MonoInst *klass_inst, MonoBasicBlock *object_is_null)
 292 {
 293         if (m_class_get_rank (klass)) {
 294                 int rank_reg = alloc_preg (cfg);
 295                 int eclass_reg = alloc_preg (cfg);
 296
 297                 g_assert (!klass_inst);
 298
 299                 MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADU1_MEMBASE, rank_reg, klass_reg, m_class_offsetof_rank ());
 300                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, rank_reg, m_class_get_rank (klass));
 301                 MONO_EMIT_NEW_COND_EXC (cfg, NE_UN, "InvalidCastException");
 302
 303                 //              MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 304                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, eclass_reg, klass_reg, m_class_offsetof_cast_class ());
 305                 if (m_class_is_array_special_interface (m_class_get_cast_class (klass))) {
 306                         MonoInst *src;
 307
 308                         MONO_INST_NEW (cfg, src, OP_LOCAL);
 309                         src->dreg = obj_reg;
 310                         emit_castclass_with_cache_no_details (cfg, src, klass, 0);
 311                 } else if (m_class_get_cast_class (klass) == mono_defaults.object_class) {
 312                         int parent_reg = alloc_preg (cfg);
 313                         MONO_EMIT_NEW_LOAD_MEMBASE (cfg, parent_reg, eclass_reg, m_class_offsetof_parent ());
 314                         mini_emit_class_check_branch (cfg, parent_reg, m_class_get_parent (mono_defaults.enum_class), OP_PBNE_UN, object_is_null);
 315                         mini_emit_class_check (cfg, eclass_reg, mono_defaults.enum_class);
 316                 } else if (m_class_get_cast_class (klass) == m_class_get_parent (mono_defaults.enum_class)) {
 317                         mini_emit_class_check_branch (cfg, eclass_reg, m_class_get_parent (mono_defaults.enum_class), OP_PBEQ, object_is_null);
 318                         mini_emit_class_check (cfg, eclass_reg, mono_defaults.enum_class);
 319                 } else if (m_class_get_cast_class (klass) == mono_defaults.enum_class) {
 320                         mini_emit_class_check (cfg, eclass_reg, mono_defaults.enum_class);
 321                 } else if (mono_class_is_interface (m_class_get_cast_class (klass))) {
 322                         mini_emit_iface_class_cast (cfg, eclass_reg, m_class_get_cast_class (klass), NULL, NULL);
 323                 } else {
 324                         // Pass -1 as obj_reg to skip the check below for arrays of arrays
 325                         mini_emit_castclass (cfg, -1, eclass_reg, m_class_get_cast_class (klass), object_is_null);
 326                 }
 327
 328                 if ((m_class_get_rank (klass) == 1) && (m_class_get_byval_arg (klass)->type == MONO_TYPE_SZARRAY) && (obj_reg != -1)) {
 329                         /* Check that the object is a vector too */
 330                         int bounds_reg = alloc_preg (cfg);
 331                         MONO_EMIT_NEW_LOAD_MEMBASE (cfg, bounds_reg, obj_reg, MONO_STRUCT_OFFSET (MonoArray, bounds));
 332                         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, bounds_reg, 0);
 333                         MONO_EMIT_NEW_COND_EXC (cfg, NE_UN, "InvalidCastException");
 334                 }
 335         } else {
 336                 int idepth_reg = alloc_preg (cfg);
 337                 int stypes_reg = alloc_preg (cfg);
 338                 int stype = alloc_preg (cfg);
 339
 340                 mono_class_setup_supertypes (klass);
 341
 342                 if (m_class_get_idepth (klass) > MONO_DEFAULT_SUPERTABLE_SIZE) {
 343                         MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADU2_MEMBASE, idepth_reg, klass_reg, m_class_offsetof_idepth ());
 344                         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, idepth_reg, m_class_get_idepth (klass));
 345                         MONO_EMIT_NEW_COND_EXC (cfg, LT_UN, "InvalidCastException");
 346                 }
 347                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, stypes_reg, klass_reg, m_class_offsetof_supertypes ());
 348                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, stype, stypes_reg, ((m_class_get_idepth (klass) - 1) * TARGET_SIZEOF_VOID_P));
 349                 mini_emit_class_check_inst (cfg, stype, klass, klass_inst);
 350         }
 351 }
 352
 353 static void
 354 mini_emit_castclass (MonoCompile *cfg, int obj_reg, int klass_reg, MonoClass *klass, MonoBasicBlock *object_is_null)
 355 {
 356         mini_emit_castclass_inst (cfg, obj_reg, klass_reg, klass, NULL, object_is_null);
 357 }
 358
 359 static void
 360 emit_special_array_iface_check (MonoCompile *cfg, MonoInst *src, MonoClass* klass, int vtable_reg, MonoBasicBlock *true_bb, int context_used)
 361 {
 362         MonoBasicBlock *not_an_array;
 363         int rank_reg;
 364
 365         if (!m_class_is_array_special_interface (klass))
 366                 return;
 367
 368         rank_reg = alloc_ireg (cfg);
 369
 370         NEW_BBLOCK (cfg, not_an_array);
 371         MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADU1_MEMBASE, rank_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, rank));
 372         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, rank_reg, 1);
 373         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_IBNE_UN, not_an_array);
 374
 375         emit_castclass_with_cache_no_details (cfg, src, klass, context_used);
 376         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, true_bb);
 377
 378         MONO_START_BB (cfg, not_an_array);
 379
 380 }
 381
 382 /*
 383  * Returns NULL and set the cfg exception on error.
 384  */
 385 static MonoInst*
 386 handle_castclass (MonoCompile *cfg, MonoClass *klass, MonoInst *src, int context_used)
 387 {
 388         MonoBasicBlock *is_null_bb;
 389         int obj_reg = src->dreg;
 390         MonoInst *klass_inst = NULL;
 391
 392         if (MONO_INS_IS_PCONST_NULL (src))
 393                 return src;
 394
 395         if (context_used) {
 396
 397                 if (is_complex_isinst (klass))
 398                         return emit_castclass_with_cache (cfg, src, klass, context_used);
 399
 400                 klass_inst = mini_emit_get_rgctx_klass (cfg, context_used, klass, MONO_RGCTX_INFO_KLASS);
 401         }
 402
 403         NEW_BBLOCK (cfg, is_null_bb);
 404
 405         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, obj_reg, 0);
 406         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBEQ, is_null_bb);
 407
 408         mini_save_cast_details (cfg, klass, obj_reg, FALSE);
 409
 410         if (mono_class_is_interface (klass)) {
 411                 int tmp_reg = alloc_preg (cfg);
 412 #ifndef DISABLE_REMOTING
 413                 MonoBasicBlock *interface_fail_bb;
 414                 int klass_reg = alloc_preg (cfg);
 415
 416                 NEW_BBLOCK (cfg, interface_fail_bb);
 417
 418                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, tmp_reg, obj_reg, MONO_STRUCT_OFFSET (MonoObject, vtable));
 419                 mini_emit_iface_cast (cfg, tmp_reg, klass, interface_fail_bb, is_null_bb);
 420
 421                 // iface bitmap check failed
 422                 MONO_START_BB (cfg, interface_fail_bb);
 423
 424                 //Check if it's a rank zero array and emit fallback casting
 425                 emit_special_array_iface_check (cfg, src, klass, tmp_reg, is_null_bb, context_used);
 426
 427                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, tmp_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 428
 429                 mini_emit_class_check (cfg, klass_reg, mono_defaults.transparent_proxy_class);
 430
 431                 tmp_reg = alloc_preg (cfg);
 432                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, tmp_reg, obj_reg, MONO_STRUCT_OFFSET (MonoTransparentProxy, custom_type_info));
 433                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, tmp_reg, 0);
 434                 MONO_EMIT_NEW_COND_EXC (cfg, EQ, "InvalidCastException");
 435
 436                 MonoInst *args [1] = { src };
 437                 MonoInst *proxy_test_inst = mono_emit_method_call (cfg, mono_marshal_get_proxy_cancast (klass), args, NULL);
 438                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, proxy_test_inst->dreg, 0);
 439                 MONO_EMIT_NEW_COND_EXC (cfg, EQ, "InvalidCastException");
 440
 441                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, is_null_bb);
 442 #else
 443                 MonoBasicBlock *interface_fail_bb = NULL;
 444
 445                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, tmp_reg, obj_reg, MONO_STRUCT_OFFSET (MonoObject, vtable));
 446
 447                 if (m_class_is_array_special_interface (klass)) {
 448                         NEW_BBLOCK (cfg, interface_fail_bb);
 449                         mini_emit_iface_cast (cfg, tmp_reg, klass, interface_fail_bb, is_null_bb);
 450                         // iface bitmap check failed
 451                         MONO_START_BB (cfg, interface_fail_bb);
 452
 453                         //Check if it's a rank zero array and emit fallback casting
 454                         emit_special_array_iface_check (cfg, src, klass, tmp_reg, is_null_bb, context_used);
 455                 } else {
 456                         mini_emit_iface_cast (cfg, tmp_reg, klass, NULL, NULL);
 457                         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, is_null_bb);
 458                 }
 459 #endif
 460         } else if (mono_class_is_marshalbyref (klass)) {
 461 #ifndef DISABLE_REMOTING
 462                 MonoBasicBlock *no_proxy_bb, *fail_1_bb;
 463                 int tmp_reg = alloc_preg (cfg);
 464                 int klass_reg = alloc_preg (cfg);
 465
 466                 NEW_BBLOCK (cfg, no_proxy_bb);
 467
 468                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, tmp_reg, obj_reg, MONO_STRUCT_OFFSET (MonoObject, vtable));
 469                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, tmp_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 470                 mini_emit_class_check_branch (cfg, klass_reg, mono_defaults.transparent_proxy_class, OP_PBNE_UN, no_proxy_bb);
 471
 472                 tmp_reg = alloc_preg (cfg);
 473                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, tmp_reg, obj_reg, MONO_STRUCT_OFFSET (MonoTransparentProxy, remote_class));
 474                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, tmp_reg, MONO_STRUCT_OFFSET (MonoRemoteClass, proxy_class));
 475
 476                 tmp_reg = alloc_preg (cfg);
 477                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, tmp_reg, obj_reg, MONO_STRUCT_OFFSET (MonoTransparentProxy, custom_type_info));
 478                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, tmp_reg, 0);
 479                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBEQ, no_proxy_bb);
 480
 481                 NEW_BBLOCK (cfg, fail_1_bb);
 482
 483                 mini_emit_isninst_cast (cfg, klass_reg, klass, fail_1_bb, is_null_bb);
 484
 485                 MONO_START_BB (cfg, fail_1_bb);
 486
 487                 MonoInst *args [1] = { src };
 488                 MonoInst *proxy_test_inst = mono_emit_method_call (cfg, mono_marshal_get_proxy_cancast (klass), args, NULL);
 489                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, proxy_test_inst->dreg, 0);
 490                 MONO_EMIT_NEW_COND_EXC (cfg, EQ, "InvalidCastException");
 491
 492                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, is_null_bb);
 493
 494                 MONO_START_BB (cfg, no_proxy_bb);
 495
 496                 mini_emit_castclass_inst (cfg, obj_reg, klass_reg, klass, klass_inst, is_null_bb);
 497 #else
 498                 g_error ("Transparent proxy support is disabled while trying to JIT code that uses it");
 499 #endif
 500         } else {
 501                 int vtable_reg = alloc_preg (cfg);
 502                 int klass_reg = alloc_preg (cfg);
 503
 504                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, vtable_reg, obj_reg, MONO_STRUCT_OFFSET (MonoObject, vtable));
 505
 506                 if (!m_class_get_rank (klass) && !cfg->compile_aot && !(cfg->opt & MONO_OPT_SHARED) && mono_class_is_sealed (klass)) {
 507                         /* the remoting code is broken, access the class for now */
 508                         if (0) { /*FIXME what exactly is broken? This change refers to r39380 from 2005 and mention some remoting fixes were due.*/
 509                                 MonoVTable *vt = mono_class_vtable_checked (cfg->domain, klass, &cfg->error);
 510                                 if (!is_ok (&cfg->error)) {
 511                                         mono_cfg_set_exception (cfg, MONO_EXCEPTION_MONO_ERROR);
 512                                         return NULL;
 513                                 }
 514                                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, vtable_reg, (gsize)vt);
 515                         } else {
 516                                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 517                                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, klass_reg, (gsize)klass);
 518                         }
 519                         MONO_EMIT_NEW_COND_EXC (cfg, NE_UN, "InvalidCastException");
 520                 } else {
 521                         MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 522                         mini_emit_castclass_inst (cfg, obj_reg, klass_reg, klass, klass_inst, is_null_bb);
 523                 }
 524         }
 525
 526         MONO_START_BB (cfg, is_null_bb);
 527
 528         mini_reset_cast_details (cfg);
 529
 530         return src;
 531 }
 532
 533 /*
 534  * Returns NULL and set the cfg exception on error.
 535  */
 536 static MonoInst*
 537 handle_isinst (MonoCompile *cfg, MonoClass *klass, MonoInst *src, int context_used)
 538 {
 539         MonoInst *ins;
 540         MonoBasicBlock *is_null_bb, *false_bb, *end_bb;
 541         int obj_reg = src->dreg;
 542         int vtable_reg = alloc_preg (cfg);
 543         int res_reg = alloc_ireg_ref (cfg);
 544         MonoInst *klass_inst = NULL;
 545
 546         if (context_used) {
 547                 if(is_complex_isinst (klass))
 548                         return emit_isinst_with_cache (cfg, src, klass, context_used);
 549
 550                 klass_inst = mini_emit_get_rgctx_klass (cfg, context_used, klass, MONO_RGCTX_INFO_KLASS);
 551         }
 552
 553         NEW_BBLOCK (cfg, is_null_bb);
 554         NEW_BBLOCK (cfg, false_bb);
 555         NEW_BBLOCK (cfg, end_bb);
 556
 557         /* Do the assignment at the beginning, so the other assignment can be if converted */
 558         EMIT_NEW_UNALU (cfg, ins, OP_MOVE, res_reg, obj_reg);
 559         ins->type = STACK_OBJ;
 560         ins->klass = klass;
 561
 562         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, obj_reg, 0);
 563         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_IBEQ, is_null_bb);
 564
 565         MONO_EMIT_NEW_LOAD_MEMBASE (cfg, vtable_reg, obj_reg, MONO_STRUCT_OFFSET (MonoObject, vtable));
 566
 567         if (mono_class_is_interface (klass)) {
 568                 MonoBasicBlock *interface_fail_bb;
 569
 570                 NEW_BBLOCK (cfg, interface_fail_bb);
 571
 572                 mini_emit_iface_cast (cfg, vtable_reg, klass, interface_fail_bb, is_null_bb);
 573                 MONO_START_BB (cfg, interface_fail_bb);
 574
 575                 if (m_class_is_array_special_interface (klass)) {
 576                         MonoBasicBlock *not_an_array;
 577                         MonoInst *move;
 578                         int rank_reg = alloc_ireg (cfg);
 579
 580                         NEW_BBLOCK (cfg, not_an_array);
 581                         MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADU1_MEMBASE, rank_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, rank));
 582                         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, rank_reg, 1);
 583                         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_IBNE_UN, not_an_array);
 584
 585                         MonoInst *res_inst = emit_isinst_with_cache (cfg, src, klass, context_used);
 586                         EMIT_NEW_UNALU (cfg, move, OP_MOVE, res_reg, res_inst->dreg);
 587                         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, end_bb);
 588
 589                         MONO_START_BB (cfg, not_an_array);
 590                 }
 591
 592 #ifndef DISABLE_REMOTING
 593                 int tmp_reg, klass_reg;
 594                 MonoBasicBlock *call_proxy_isinst;
 595
 596                 NEW_BBLOCK (cfg, call_proxy_isinst);
 597
 598                 klass_reg = alloc_preg (cfg);
 599                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 600
 601                 mini_emit_class_check_branch (cfg, klass_reg, mono_defaults.transparent_proxy_class, OP_PBNE_UN, false_bb);
 602
 603                 tmp_reg = alloc_preg (cfg);
 604                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, tmp_reg, obj_reg, MONO_STRUCT_OFFSET (MonoTransparentProxy, custom_type_info));
 605                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, tmp_reg, 0);
 606                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBEQ, false_bb);
 607
 608                 MONO_START_BB (cfg, call_proxy_isinst);
 609
 610                 MonoInst *args [1] = { src };
 611                 MonoInst *proxy_test_inst = mono_emit_method_call (cfg, mono_marshal_get_proxy_cancast (klass), args, NULL);
 612                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, proxy_test_inst->dreg, 0);
 613                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBNE_UN, is_null_bb);
 614 #else
 615                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, false_bb);
 616 #endif
 617
 618         } else if (mono_class_is_marshalbyref (klass)) {
 619
 620 #ifndef DISABLE_REMOTING
 621                 int tmp_reg, klass_reg;
 622                 MonoBasicBlock *no_proxy_bb, *call_proxy_isinst;
 623
 624                 NEW_BBLOCK (cfg, no_proxy_bb);
 625                 NEW_BBLOCK (cfg, call_proxy_isinst);
 626
 627                 klass_reg = alloc_preg (cfg);
 628                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 629
 630                 mini_emit_class_check_branch (cfg, klass_reg, mono_defaults.transparent_proxy_class, OP_PBNE_UN, no_proxy_bb);
 631
 632                 tmp_reg = alloc_preg (cfg);
 633                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, tmp_reg, obj_reg, MONO_STRUCT_OFFSET (MonoTransparentProxy, remote_class));
 634                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, tmp_reg, MONO_STRUCT_OFFSET (MonoRemoteClass, proxy_class));
 635
 636                 tmp_reg = alloc_preg (cfg);
 637                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, tmp_reg, obj_reg, MONO_STRUCT_OFFSET (MonoTransparentProxy, custom_type_info));
 638                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, tmp_reg, 0);
 639                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBEQ, false_bb);
 640
 641                 mini_emit_isninst_cast (cfg, klass_reg, klass, call_proxy_isinst, is_null_bb);
 642
 643                 MONO_START_BB (cfg, call_proxy_isinst);
 644
 645                 MonoInst *args [1] = { src };
 646                 MonoInst *proxy_test_inst = mono_emit_method_call (cfg, mono_marshal_get_proxy_cancast (klass), args, NULL);
 647                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, proxy_test_inst->dreg, 0);
 648                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBNE_UN, is_null_bb);
 649                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, false_bb);
 650
 651                 MONO_START_BB (cfg, no_proxy_bb);
 652
 653                 mini_emit_isninst_cast (cfg, klass_reg, klass, false_bb, is_null_bb);
 654 #else
 655                 g_error ("transparent proxy support is disabled while trying to JIT code that uses it");
 656 #endif
 657         } else {
 658                 int klass_reg = alloc_preg (cfg);
 659
 660                 if (m_class_get_rank (klass)) {
 661                         int rank_reg = alloc_preg (cfg);
 662                         int eclass_reg = alloc_preg (cfg);
 663
 664                         if ((m_class_get_rank (klass) == 1) && (m_class_get_byval_arg (klass)->type == MONO_TYPE_SZARRAY)) {
 665                                 /* Check that the object is a vector too */
 666                                 int bounds_reg = alloc_preg (cfg);
 667                                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, bounds_reg, obj_reg, MONO_STRUCT_OFFSET (MonoArray, bounds));
 668                                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, bounds_reg, 0);
 669                                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBNE_UN, false_bb);
 670                         }
 671
 672                         g_assert (!context_used);
 673                         MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADU1_MEMBASE, rank_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, rank));
 674                         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, rank_reg, m_class_get_rank (klass));
 675                         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBNE_UN, false_bb);
 676                         MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 677                         MONO_EMIT_NEW_LOAD_MEMBASE (cfg, eclass_reg, klass_reg, m_class_offsetof_cast_class ());
 678                         if (m_class_is_array_special_interface (m_class_get_cast_class (klass))) {
 679                                 MonoInst *move, *res_inst;
 680
 681                                 res_inst = emit_isinst_with_cache (cfg, src, klass, context_used);
 682                                 EMIT_NEW_UNALU (cfg, move, OP_MOVE, res_reg, res_inst->dreg);
 683                                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, end_bb);
 684                         } else if (m_class_get_cast_class (klass) == mono_defaults.object_class) {
 685                                 int parent_reg, class_kind_reg;
 686                                 MonoBasicBlock *pointer_check_bb;
 687
 688                                 NEW_BBLOCK (cfg, pointer_check_bb);
 689
 690                                 parent_reg = alloc_preg (cfg);
 691                                 class_kind_reg = alloc_preg (cfg);
 692                                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, parent_reg, eclass_reg, m_class_offsetof_parent ());
 693                                 MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADU1_MEMBASE, class_kind_reg, eclass_reg, m_class_offsetof_class_kind ());
 694
 695                                 // Check if the parent class of the element is not System.ValueType
 696                                 mini_emit_class_check_branch (cfg, parent_reg, m_class_get_parent (mono_defaults.enum_class), OP_PBNE_UN, pointer_check_bb);
 697                                 mini_emit_class_check_branch (cfg, eclass_reg, mono_defaults.enum_class, OP_PBEQ, is_null_bb);
 698                                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, false_bb);
 699
 700                                 MONO_START_BB (cfg, pointer_check_bb);
 701                                 // Check if the parent class of the element is non-null, else manually check the type
 702                                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, parent_reg, NULL);
 703                                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBNE_UN, is_null_bb);
 704                                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, class_kind_reg, MONO_CLASS_POINTER);
 705                                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBEQ, false_bb);
 706                                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, is_null_bb);
 707                         } else if (m_class_get_cast_class (klass) == m_class_get_parent (mono_defaults.enum_class)) {
 708                                 mini_emit_class_check_branch (cfg, eclass_reg, m_class_get_parent (mono_defaults.enum_class), OP_PBEQ, is_null_bb);
 709                                 mini_emit_class_check_branch (cfg, eclass_reg, mono_defaults.enum_class, OP_PBEQ, is_null_bb);
 710                                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, false_bb);
 711                         } else if (m_class_get_cast_class (klass) == mono_defaults.enum_class) {
 712                                 mini_emit_class_check_branch (cfg, eclass_reg, mono_defaults.enum_class, OP_PBEQ, is_null_bb);
 713                                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, false_bb);
 714                         } else if (mono_class_is_interface (m_class_get_cast_class (klass))) {
 715                                 mini_emit_iface_class_cast (cfg, eclass_reg, m_class_get_cast_class (klass), false_bb, is_null_bb);
 716                         } else {
 717                                 /* the is_null_bb target simply copies the input register to the output */
 718                                 mini_emit_isninst_cast (cfg, eclass_reg, m_class_get_cast_class (klass), false_bb, is_null_bb);
 719                         }
 720                 } else if (mono_class_is_nullable (klass)) {
 721                         g_assert (!context_used);
 722                         MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 723                         /* the is_null_bb target simply copies the input register to the output */
 724                         mini_emit_isninst_cast (cfg, klass_reg, m_class_get_cast_class (klass), false_bb, is_null_bb);
 725                 } else {
 726                         if (!cfg->compile_aot && !(cfg->opt & MONO_OPT_SHARED) && mono_class_is_sealed (klass)) {
 727                                 g_assert (!context_used);
 728                                 /* the remoting code is broken, access the class for now */
 729                                 if (0) {/*FIXME what exactly is broken? This change refers to r39380 from 2005 and mention some remoting fixes were due.*/
 730                                         MonoVTable *vt = mono_class_vtable_checked (cfg->domain, klass, &cfg->error);
 731                                         if (!is_ok (&cfg->error)) {
 732                                                 mono_cfg_set_exception (cfg, MONO_EXCEPTION_MONO_ERROR);
 733                                                 return NULL;
 734                                         }
 735                                         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, vtable_reg, (gsize)vt);
 736                                 } else {
 737                                         MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 738                                         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, klass_reg, (gsize)klass);
 739                                 }
 740                                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBNE_UN, false_bb);
 741                                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, is_null_bb);
 742                         } else {
 743                                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 744                                 /* the is_null_bb target simply copies the input register to the output */
 745                                 mini_emit_isninst_cast_inst (cfg, klass_reg, klass, klass_inst, false_bb, is_null_bb);
 746                         }
 747                 }
 748         }
 749
 750         MONO_START_BB (cfg, false_bb);
 751
 752         MONO_EMIT_NEW_PCONST (cfg, res_reg, NULL);
 753         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, end_bb);
 754
 755         MONO_START_BB (cfg, is_null_bb);
 756
 757         MONO_START_BB (cfg, end_bb);
 758
 759         return ins;
 760 }
 761
 762 static void
 763 mono_decompose_typecheck (MonoCompile *cfg, MonoBasicBlock *bb, MonoInst *ins)
 764 {
 765         MonoInst *ret, *move, *source;
 766         MonoClass *klass = ins->klass;
 767         int context_used = mini_class_check_context_used (cfg, klass);
 768         int is_isinst = ins->opcode == OP_ISINST;
 769         g_assert (is_isinst || ins->opcode == OP_CASTCLASS);
 770         source = get_vreg_to_inst (cfg, ins->sreg1);
 771         if (!source || source == (MonoInst *) -1)
 772                 source = mono_compile_create_var_for_vreg (cfg, mono_get_object_type (), OP_LOCAL, ins->sreg1);
 773         g_assert (source && source != (MonoInst *) -1);
 774
 775         MonoBasicBlock *first_bb;
 776         NEW_BBLOCK (cfg, first_bb);
 777         cfg->cbb = first_bb;
 778
 779         if (mini_class_has_reference_variant_generic_argument (cfg, klass, context_used)) {
 780                 if (is_isinst)
 781                         ret = emit_isinst_with_cache (cfg, source, klass, context_used);
 782                 else
 783                         ret = emit_castclass_with_cache (cfg, source, klass, context_used);
 784
 785         } else {
 786                 if (is_isinst)
 787                         ret = handle_isinst (cfg, klass, source, context_used);
 788                 else
 789                         ret = handle_castclass (cfg, klass, source, context_used);
 790         }
 791         EMIT_NEW_UNALU (cfg, move, OP_MOVE, ins->dreg, ret->dreg);
 792
 793         g_assert (cfg->cbb->code || first_bb->code);
 794         MonoInst *prev = ins->prev;
 795         mono_replace_ins (cfg, bb, ins, &prev, first_bb, cfg->cbb);
 796 }
 797
 798 void
 799 mono_decompose_typechecks (MonoCompile *cfg)
 800 {
 801         gboolean found_typetest = FALSE;
 802         for (MonoBasicBlock *bb = cfg->bb_entry; bb; bb = bb->next_bb) {
 803                 MonoInst *ins;
 804                 MONO_BB_FOR_EACH_INS (bb, ins) {
 805                         switch (ins->opcode) {
 806                         case OP_ISINST:
 807                         case OP_CASTCLASS:
 808                                 found_typetest = TRUE;
 809                                 mono_decompose_typecheck (cfg, bb, ins);
 810                                 break;
 811                         }
 812                 }
 813         }
 814         if ((cfg->verbose_level > 2) && found_typetest)
 815                 mono_print_code (cfg, "AFTER DECOMPOSE TYPE_CHECKS");
 816
 817 }
 818
 819
 820 //API used by method-to-ir.c
 821 void
 822 mini_emit_class_check (MonoCompile *cfg, int klass_reg, MonoClass *klass)
 823 {
 824         mini_emit_class_check_inst (cfg, klass_reg, klass, NULL);
 825 }
 826
 827 #else
 828
 829 MONO_EMPTY_SOURCE_FILE (type_checking);
 830 #endif