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, sizeof (gpointer));
  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) * 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, 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, 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                 MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADU1_MEMBASE, rank_reg, klass_reg, m_class_offsetof_rank ());
 299                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, rank_reg, m_class_get_rank (klass));
 300                 MONO_EMIT_NEW_COND_EXC (cfg, NE_UN, "InvalidCastException");
 301                 //              MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 302                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, eclass_reg, klass_reg, m_class_offsetof_cast_class ());
 303                 if (m_class_get_cast_class (klass) == mono_defaults.object_class) {
 304                         int parent_reg = alloc_preg (cfg);
 305                         MONO_EMIT_NEW_LOAD_MEMBASE (cfg, parent_reg, eclass_reg, m_class_offsetof_parent ());
 306                         mini_emit_class_check_branch (cfg, parent_reg, m_class_get_parent (mono_defaults.enum_class), OP_PBNE_UN, object_is_null);
 307                         mini_emit_class_check (cfg, eclass_reg, mono_defaults.enum_class);
 308                 } else if (m_class_get_cast_class (klass) == m_class_get_parent (mono_defaults.enum_class)) {
 309                         mini_emit_class_check_branch (cfg, eclass_reg, m_class_get_parent (mono_defaults.enum_class), OP_PBEQ, object_is_null);
 310                         mini_emit_class_check (cfg, eclass_reg, mono_defaults.enum_class);
 311                 } else if (m_class_get_cast_class (klass) == mono_defaults.enum_class) {
 312                         mini_emit_class_check (cfg, eclass_reg, mono_defaults.enum_class);
 313                 } else if (mono_class_is_interface (m_class_get_cast_class (klass))) {
 314                         mini_emit_iface_class_cast (cfg, eclass_reg, m_class_get_cast_class (klass), NULL, NULL);
 315                 } else {
 316                         // Pass -1 as obj_reg to skip the check below for arrays of arrays
 317                         mini_emit_castclass (cfg, -1, eclass_reg, m_class_get_cast_class (klass), object_is_null);
 318                 }
 319
 320                 if ((m_class_get_rank (klass) == 1) && (m_class_get_byval_arg (klass)->type == MONO_TYPE_SZARRAY) && (obj_reg != -1)) {
 321                         /* Check that the object is a vector too */
 322                         int bounds_reg = alloc_preg (cfg);
 323                         MONO_EMIT_NEW_LOAD_MEMBASE (cfg, bounds_reg, obj_reg, MONO_STRUCT_OFFSET (MonoArray, bounds));
 324                         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, bounds_reg, 0);
 325                         MONO_EMIT_NEW_COND_EXC (cfg, NE_UN, "InvalidCastException");
 326                 }
 327         } else {
 328                 int idepth_reg = alloc_preg (cfg);
 329                 int stypes_reg = alloc_preg (cfg);
 330                 int stype = alloc_preg (cfg);
 331
 332                 mono_class_setup_supertypes (klass);
 333
 334                 if (m_class_get_idepth (klass) > MONO_DEFAULT_SUPERTABLE_SIZE) {
 335                         MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADU2_MEMBASE, idepth_reg, klass_reg, m_class_offsetof_idepth ());
 336                         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, idepth_reg, m_class_get_idepth (klass));
 337                         MONO_EMIT_NEW_COND_EXC (cfg, LT_UN, "InvalidCastException");
 338                 }
 339                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, stypes_reg, klass_reg, m_class_offsetof_supertypes ());
 340                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, stype, stypes_reg, ((m_class_get_idepth (klass) - 1) * SIZEOF_VOID_P));
 341                 mini_emit_class_check_inst (cfg, stype, klass, klass_inst);
 342         }
 343 }
 344
 345 static void
 346 mini_emit_castclass (MonoCompile *cfg, int obj_reg, int klass_reg, MonoClass *klass, MonoBasicBlock *object_is_null)
 347 {
 348         mini_emit_castclass_inst (cfg, obj_reg, klass_reg, klass, NULL, object_is_null);
 349 }
 350
 351 static void
 352 emit_special_array_iface_check (MonoCompile *cfg, MonoInst *src, MonoClass* klass, int vtable_reg, MonoBasicBlock *true_bb, int context_used)
 353 {
 354         MonoBasicBlock *not_an_array;
 355         int rank_reg;
 356
 357         if (!m_class_is_array_special_interface (klass))
 358                 return;
 359
 360         rank_reg = alloc_ireg (cfg);
 361
 362         NEW_BBLOCK (cfg, not_an_array);
 363         MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADU1_MEMBASE, rank_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, rank));
 364         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, rank_reg, 1);
 365         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_IBNE_UN, not_an_array);
 366
 367         emit_castclass_with_cache_no_details (cfg, src, klass, context_used);
 368         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, true_bb);
 369
 370         MONO_START_BB (cfg, not_an_array);
 371
 372 }
 373
 374 /*
 375  * Returns NULL and set the cfg exception on error.
 376  */
 377 static MonoInst*
 378 handle_castclass (MonoCompile *cfg, MonoClass *klass, MonoInst *src, int context_used)
 379 {
 380         MonoBasicBlock *is_null_bb;
 381         int obj_reg = src->dreg;
 382         MonoInst *klass_inst = NULL;
 383
 384         if (MONO_INS_IS_PCONST_NULL (src))
 385                 return src;
 386
 387         if (context_used) {
 388
 389                 if (is_complex_isinst (klass))
 390                         return emit_castclass_with_cache (cfg, src, klass, context_used);
 391
 392                 klass_inst = mini_emit_get_rgctx_klass (cfg, context_used, klass, MONO_RGCTX_INFO_KLASS);
 393         }
 394
 395         NEW_BBLOCK (cfg, is_null_bb);
 396
 397         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, obj_reg, 0);
 398         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBEQ, is_null_bb);
 399
 400         mini_save_cast_details (cfg, klass, obj_reg, FALSE);
 401
 402         if (mono_class_is_interface (klass)) {
 403                 int tmp_reg = alloc_preg (cfg);
 404 #ifndef DISABLE_REMOTING
 405                 MonoBasicBlock *interface_fail_bb;
 406                 int klass_reg = alloc_preg (cfg);
 407
 408                 NEW_BBLOCK (cfg, interface_fail_bb);
 409
 410                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, tmp_reg, obj_reg, MONO_STRUCT_OFFSET (MonoObject, vtable));
 411                 mini_emit_iface_cast (cfg, tmp_reg, klass, interface_fail_bb, is_null_bb);
 412
 413                 // iface bitmap check failed
 414                 MONO_START_BB (cfg, interface_fail_bb);
 415
 416                 //Check if it's a rank zero array and emit fallback casting
 417                 emit_special_array_iface_check (cfg, src, klass, tmp_reg, is_null_bb, context_used);
 418
 419                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, tmp_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 420
 421                 mini_emit_class_check (cfg, klass_reg, mono_defaults.transparent_proxy_class);
 422
 423                 tmp_reg = alloc_preg (cfg);
 424                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, tmp_reg, obj_reg, MONO_STRUCT_OFFSET (MonoTransparentProxy, custom_type_info));
 425                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, tmp_reg, 0);
 426                 MONO_EMIT_NEW_COND_EXC (cfg, EQ, "InvalidCastException");
 427
 428                 MonoInst *args [1] = { src };
 429                 MonoInst *proxy_test_inst = mono_emit_method_call (cfg, mono_marshal_get_proxy_cancast (klass), args, NULL);
 430                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, proxy_test_inst->dreg, 0);
 431                 MONO_EMIT_NEW_COND_EXC (cfg, EQ, "InvalidCastException");
 432
 433                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, is_null_bb);
 434 #else
 435                 MonoBasicBlock *interface_fail_bb = NULL;
 436
 437                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, tmp_reg, obj_reg, MONO_STRUCT_OFFSET (MonoObject, vtable));
 438
 439                 if (klass->is_array_special_interface) {
 440                         NEW_BBLOCK (cfg, interface_fail_bb);
 441                         mini_emit_iface_cast (cfg, tmp_reg, klass, interface_fail_bb, is_null_bb);
 442                         // iface bitmap check failed
 443                         MONO_START_BB (cfg, interface_fail_bb);
 444
 445                         //Check if it's a rank zero array and emit fallback casting
 446                         emit_special_array_iface_check (cfg, src, klass, tmp_reg, is_null_bb, context_used);
 447                 } else {
 448                         mini_emit_iface_cast (cfg, tmp_reg, klass, NULL, NULL);
 449                         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, is_null_bb);
 450                 }
 451 #endif
 452         } else if (mono_class_is_marshalbyref (klass)) {
 453 #ifndef DISABLE_REMOTING
 454                 MonoBasicBlock *no_proxy_bb, *fail_1_bb;
 455                 int tmp_reg = alloc_preg (cfg);
 456                 int klass_reg = alloc_preg (cfg);
 457
 458                 NEW_BBLOCK (cfg, no_proxy_bb);
 459
 460                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, tmp_reg, obj_reg, MONO_STRUCT_OFFSET (MonoObject, vtable));
 461                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, tmp_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 462                 mini_emit_class_check_branch (cfg, klass_reg, mono_defaults.transparent_proxy_class, OP_PBNE_UN, no_proxy_bb);
 463
 464                 tmp_reg = alloc_preg (cfg);
 465                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, tmp_reg, obj_reg, MONO_STRUCT_OFFSET (MonoTransparentProxy, remote_class));
 466                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, tmp_reg, MONO_STRUCT_OFFSET (MonoRemoteClass, proxy_class));
 467
 468                 tmp_reg = alloc_preg (cfg);
 469                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, tmp_reg, obj_reg, MONO_STRUCT_OFFSET (MonoTransparentProxy, custom_type_info));
 470                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, tmp_reg, 0);
 471                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBEQ, no_proxy_bb);
 472
 473                 NEW_BBLOCK (cfg, fail_1_bb);
 474
 475                 mini_emit_isninst_cast (cfg, klass_reg, klass, fail_1_bb, is_null_bb);
 476
 477                 MONO_START_BB (cfg, fail_1_bb);
 478
 479                 MonoInst *args [1] = { src };
 480                 MonoInst *proxy_test_inst = mono_emit_method_call (cfg, mono_marshal_get_proxy_cancast (klass), args, NULL);
 481                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, proxy_test_inst->dreg, 0);
 482                 MONO_EMIT_NEW_COND_EXC (cfg, EQ, "InvalidCastException");
 483
 484                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, is_null_bb);
 485
 486                 MONO_START_BB (cfg, no_proxy_bb);
 487
 488                 mini_emit_castclass_inst (cfg, obj_reg, klass_reg, klass, klass_inst, is_null_bb);
 489 #else
 490                 g_error ("Transparent proxy support is disabled while trying to JIT code that uses it");
 491 #endif
 492         } else {
 493                 int vtable_reg = alloc_preg (cfg);
 494                 int klass_reg = alloc_preg (cfg);
 495
 496                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, vtable_reg, obj_reg, MONO_STRUCT_OFFSET (MonoObject, vtable));
 497
 498                 if (!m_class_get_rank (klass) && !cfg->compile_aot && !(cfg->opt & MONO_OPT_SHARED) && mono_class_is_sealed (klass)) {
 499                         /* the remoting code is broken, access the class for now */
 500                         if (0) { /*FIXME what exactly is broken? This change refers to r39380 from 2005 and mention some remoting fixes were due.*/
 501                                 MonoVTable *vt = mono_class_vtable_checked (cfg->domain, klass, &cfg->error);
 502                                 if (!is_ok (&cfg->error)) {
 503                                         mono_cfg_set_exception (cfg, MONO_EXCEPTION_MONO_ERROR);
 504                                         return NULL;
 505                                 }
 506                                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, vtable_reg, vt);
 507                         } else {
 508                                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 509                                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, klass_reg, klass);
 510                         }
 511                         MONO_EMIT_NEW_COND_EXC (cfg, NE_UN, "InvalidCastException");
 512                 } else {
 513                         MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 514                         mini_emit_castclass_inst (cfg, obj_reg, klass_reg, klass, klass_inst, is_null_bb);
 515                 }
 516         }
 517
 518         MONO_START_BB (cfg, is_null_bb);
 519
 520         mini_reset_cast_details (cfg);
 521
 522         return src;
 523 }
 524
 525 /*
 526  * Returns NULL and set the cfg exception on error.
 527  */
 528 static MonoInst*
 529 handle_isinst (MonoCompile *cfg, MonoClass *klass, MonoInst *src, int context_used)
 530 {
 531         MonoInst *ins;
 532         MonoBasicBlock *is_null_bb, *false_bb, *end_bb;
 533         int obj_reg = src->dreg;
 534         int vtable_reg = alloc_preg (cfg);
 535         int res_reg = alloc_ireg_ref (cfg);
 536         MonoInst *klass_inst = NULL;
 537
 538         if (context_used) {
 539                 if(is_complex_isinst (klass))
 540                         return emit_isinst_with_cache (cfg, src, klass, context_used);
 541
 542                 klass_inst = mini_emit_get_rgctx_klass (cfg, context_used, klass, MONO_RGCTX_INFO_KLASS);
 543         }
 544
 545         NEW_BBLOCK (cfg, is_null_bb);
 546         NEW_BBLOCK (cfg, false_bb);
 547         NEW_BBLOCK (cfg, end_bb);
 548
 549         /* Do the assignment at the beginning, so the other assignment can be if converted */
 550         EMIT_NEW_UNALU (cfg, ins, OP_MOVE, res_reg, obj_reg);
 551         ins->type = STACK_OBJ;
 552         ins->klass = klass;
 553
 554         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, obj_reg, 0);
 555         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_IBEQ, is_null_bb);
 556
 557         MONO_EMIT_NEW_LOAD_MEMBASE (cfg, vtable_reg, obj_reg, MONO_STRUCT_OFFSET (MonoObject, vtable));
 558
 559         if (mono_class_is_interface (klass)) {
 560                 MonoBasicBlock *interface_fail_bb;
 561
 562                 NEW_BBLOCK (cfg, interface_fail_bb);
 563
 564                 mini_emit_iface_cast (cfg, vtable_reg, klass, interface_fail_bb, is_null_bb);
 565                 MONO_START_BB (cfg, interface_fail_bb);
 566
 567                 if (m_class_is_array_special_interface (klass)) {
 568                         MonoBasicBlock *not_an_array;
 569                         MonoInst *move;
 570                         int rank_reg = alloc_ireg (cfg);
 571
 572                         NEW_BBLOCK (cfg, not_an_array);
 573                         MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADU1_MEMBASE, rank_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, rank));
 574                         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, rank_reg, 1);
 575                         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_IBNE_UN, not_an_array);
 576
 577                         MonoInst *res_inst = emit_isinst_with_cache (cfg, src, klass, context_used);
 578                         EMIT_NEW_UNALU (cfg, move, OP_MOVE, res_reg, res_inst->dreg);
 579                         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, end_bb);
 580
 581                         MONO_START_BB (cfg, not_an_array);
 582                 }
 583
 584 #ifndef DISABLE_REMOTING
 585                 int tmp_reg, klass_reg;
 586                 MonoBasicBlock *call_proxy_isinst;
 587
 588                 NEW_BBLOCK (cfg, call_proxy_isinst);
 589
 590                 klass_reg = alloc_preg (cfg);
 591                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 592
 593                 mini_emit_class_check_branch (cfg, klass_reg, mono_defaults.transparent_proxy_class, OP_PBNE_UN, false_bb);
 594
 595                 tmp_reg = alloc_preg (cfg);
 596                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, tmp_reg, obj_reg, MONO_STRUCT_OFFSET (MonoTransparentProxy, custom_type_info));
 597                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, tmp_reg, 0);
 598                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBEQ, false_bb);
 599
 600                 MONO_START_BB (cfg, call_proxy_isinst);
 601
 602                 MonoInst *args [1] = { src };
 603                 MonoInst *proxy_test_inst = mono_emit_method_call (cfg, mono_marshal_get_proxy_cancast (klass), args, NULL);
 604                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, proxy_test_inst->dreg, 0);
 605                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBNE_UN, is_null_bb);
 606 #else
 607                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, false_bb);
 608 #endif
 609
 610         } else if (mono_class_is_marshalbyref (klass)) {
 611
 612 #ifndef DISABLE_REMOTING
 613                 int tmp_reg, klass_reg;
 614                 MonoBasicBlock *no_proxy_bb, *call_proxy_isinst;
 615
 616                 NEW_BBLOCK (cfg, no_proxy_bb);
 617                 NEW_BBLOCK (cfg, call_proxy_isinst);
 618
 619                 klass_reg = alloc_preg (cfg);
 620                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 621
 622                 mini_emit_class_check_branch (cfg, klass_reg, mono_defaults.transparent_proxy_class, OP_PBNE_UN, no_proxy_bb);
 623
 624                 tmp_reg = alloc_preg (cfg);
 625                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, tmp_reg, obj_reg, MONO_STRUCT_OFFSET (MonoTransparentProxy, remote_class));
 626                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, tmp_reg, MONO_STRUCT_OFFSET (MonoRemoteClass, proxy_class));
 627
 628                 tmp_reg = alloc_preg (cfg);
 629                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, tmp_reg, obj_reg, MONO_STRUCT_OFFSET (MonoTransparentProxy, custom_type_info));
 630                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, tmp_reg, 0);
 631                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBEQ, false_bb);
 632
 633                 mini_emit_isninst_cast (cfg, klass_reg, klass, call_proxy_isinst, is_null_bb);
 634
 635                 MONO_START_BB (cfg, call_proxy_isinst);
 636
 637                 MonoInst *args [1] = { src };
 638                 MonoInst *proxy_test_inst = mono_emit_method_call (cfg, mono_marshal_get_proxy_cancast (klass), args, NULL);
 639                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, proxy_test_inst->dreg, 0);
 640                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBNE_UN, is_null_bb);
 641                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, false_bb);
 642
 643                 MONO_START_BB (cfg, no_proxy_bb);
 644
 645                 mini_emit_isninst_cast (cfg, klass_reg, klass, false_bb, is_null_bb);
 646 #else
 647                 g_error ("transparent proxy support is disabled while trying to JIT code that uses it");
 648 #endif
 649         } else {
 650                 int klass_reg = alloc_preg (cfg);
 651
 652                 if (m_class_get_rank (klass)) {
 653                         int rank_reg = alloc_preg (cfg);
 654                         int eclass_reg = alloc_preg (cfg);
 655
 656                         if ((m_class_get_rank (klass) == 1) && (m_class_get_byval_arg (klass)->type == MONO_TYPE_SZARRAY)) {
 657                                 /* Check that the object is a vector too */
 658                                 int bounds_reg = alloc_preg (cfg);
 659                                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, bounds_reg, obj_reg, MONO_STRUCT_OFFSET (MonoArray, bounds));
 660                                 MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, bounds_reg, 0);
 661                                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBNE_UN, false_bb);
 662                         }
 663
 664                         g_assert (!context_used);
 665                         MONO_EMIT_NEW_LOAD_MEMBASE_OP (cfg, OP_LOADU1_MEMBASE, rank_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, rank));
 666                         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, rank_reg, m_class_get_rank (klass));
 667                         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBNE_UN, false_bb);
 668                         MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 669                         MONO_EMIT_NEW_LOAD_MEMBASE (cfg, eclass_reg, klass_reg, m_class_offsetof_cast_class ());
 670                         if (m_class_get_cast_class (klass) == mono_defaults.object_class) {
 671                                 int parent_reg = alloc_preg (cfg);
 672                                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, parent_reg, eclass_reg, m_class_offsetof_parent ());
 673                                 mini_emit_class_check_branch (cfg, parent_reg, m_class_get_parent (mono_defaults.enum_class), OP_PBNE_UN, is_null_bb);
 674                                 mini_emit_class_check_branch (cfg, eclass_reg, mono_defaults.enum_class, OP_PBEQ, is_null_bb);
 675                                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, false_bb);
 676                         } else if (m_class_get_cast_class (klass) == m_class_get_parent (mono_defaults.enum_class)) {
 677                                 mini_emit_class_check_branch (cfg, eclass_reg, m_class_get_parent (mono_defaults.enum_class), OP_PBEQ, is_null_bb);
 678                                 mini_emit_class_check_branch (cfg, eclass_reg, mono_defaults.enum_class, OP_PBEQ, is_null_bb);
 679                                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, false_bb);
 680                         } else if (m_class_get_cast_class (klass) == mono_defaults.enum_class) {
 681                                 mini_emit_class_check_branch (cfg, eclass_reg, mono_defaults.enum_class, OP_PBEQ, is_null_bb);
 682                                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, false_bb);
 683                         } else if (mono_class_is_interface (m_class_get_cast_class (klass))) {
 684                                 mini_emit_iface_class_cast (cfg, eclass_reg, m_class_get_cast_class (klass), false_bb, is_null_bb);
 685                         } else {
 686                                 /* the is_null_bb target simply copies the input register to the output */
 687                                 mini_emit_isninst_cast (cfg, eclass_reg, m_class_get_cast_class (klass), false_bb, is_null_bb);
 688                         }
 689                 } else if (mono_class_is_nullable (klass)) {
 690                         g_assert (!context_used);
 691                         MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 692                         /* the is_null_bb target simply copies the input register to the output */
 693                         mini_emit_isninst_cast (cfg, klass_reg, m_class_get_cast_class (klass), false_bb, is_null_bb);
 694                 } else {
 695                         if (!cfg->compile_aot && !(cfg->opt & MONO_OPT_SHARED) && mono_class_is_sealed (klass)) {
 696                                 g_assert (!context_used);
 697                                 /* the remoting code is broken, access the class for now */
 698                                 if (0) {/*FIXME what exactly is broken? This change refers to r39380 from 2005 and mention some remoting fixes were due.*/
 699                                         MonoVTable *vt = mono_class_vtable_checked (cfg->domain, klass, &cfg->error);
 700                                         if (!is_ok (&cfg->error)) {
 701                                                 mono_cfg_set_exception (cfg, MONO_EXCEPTION_MONO_ERROR);
 702                                                 return NULL;
 703                                         }
 704                                         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, vtable_reg, vt);
 705                                 } else {
 706                                         MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 707                                         MONO_EMIT_NEW_BIALU_IMM (cfg, OP_COMPARE_IMM, -1, klass_reg, klass);
 708                                 }
 709                                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_PBNE_UN, false_bb);
 710                                 MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, is_null_bb);
 711                         } else {
 712                                 MONO_EMIT_NEW_LOAD_MEMBASE (cfg, klass_reg, vtable_reg, MONO_STRUCT_OFFSET (MonoVTable, klass));
 713                                 /* the is_null_bb target simply copies the input register to the output */
 714                                 mini_emit_isninst_cast_inst (cfg, klass_reg, klass, klass_inst, false_bb, is_null_bb);
 715                         }
 716                 }
 717         }
 718
 719         MONO_START_BB (cfg, false_bb);
 720
 721         MONO_EMIT_NEW_PCONST (cfg, res_reg, NULL);
 722         MONO_EMIT_NEW_BRANCH_BLOCK (cfg, OP_BR, end_bb);
 723
 724         MONO_START_BB (cfg, is_null_bb);
 725
 726         MONO_START_BB (cfg, end_bb);
 727
 728         return ins;
 729 }
 730
 731 static void
 732 mono_decompose_typecheck (MonoCompile *cfg, MonoBasicBlock *bb, MonoInst *ins)
 733 {
 734         MonoInst *ret, *move, *source;
 735         MonoClass *klass = ins->klass;
 736         int context_used = mini_class_check_context_used (cfg, klass);
 737         int is_isinst = ins->opcode == OP_ISINST;
 738         g_assert (is_isinst || ins->opcode == OP_CASTCLASS);
 739         source = get_vreg_to_inst (cfg, ins->sreg1);
 740         if (!source || source == (MonoInst *) -1)
 741                 source = mono_compile_create_var_for_vreg (cfg, m_class_get_byval_arg (mono_defaults.object_class), OP_LOCAL, ins->sreg1);
 742         g_assert (source && source != (MonoInst *) -1);
 743
 744         MonoBasicBlock *first_bb;
 745         NEW_BBLOCK (cfg, first_bb);
 746         cfg->cbb = first_bb;
 747
 748         if (mini_class_has_reference_variant_generic_argument (cfg, klass, context_used)) {
 749                 if (is_isinst)
 750                         ret = emit_isinst_with_cache (cfg, source, klass, context_used);
 751                 else
 752                         ret = emit_castclass_with_cache (cfg, source, klass, context_used);
 753
 754         } else {
 755                 if (is_isinst)
 756                         ret = handle_isinst (cfg, klass, source, context_used);
 757                 else
 758                         ret = handle_castclass (cfg, klass, source, context_used);
 759         }
 760         EMIT_NEW_UNALU (cfg, move, OP_MOVE, ins->dreg, ret->dreg);
 761
 762         g_assert (cfg->cbb->code || first_bb->code);
 763         MonoInst *prev = ins->prev;
 764         mono_replace_ins (cfg, bb, ins, &prev, first_bb, cfg->cbb);
 765 }
 766
 767 void
 768 mono_decompose_typechecks (MonoCompile *cfg)
 769 {
 770         gboolean found_typetest = FALSE;
 771         for (MonoBasicBlock *bb = cfg->bb_entry; bb; bb = bb->next_bb) {
 772                 MonoInst *ins;
 773                 MONO_BB_FOR_EACH_INS (bb, ins) {
 774                         switch (ins->opcode) {
 775                         case OP_ISINST:
 776                         case OP_CASTCLASS:
 777                                 found_typetest = TRUE;
 778                                 mono_decompose_typecheck (cfg, bb, ins);
 779                                 break;
 780                         }
 781                 }
 782         }
 783         if ((cfg->verbose_level > 2) && found_typetest)
 784                 mono_print_code (cfg, "AFTER DECOMPOSE TYPE_CHECKS");
 785
 786 }
 787
 788
 789 //API used by method-to-ir.c
 790 void
 791 mini_emit_class_check (MonoCompile *cfg, int klass_reg, MonoClass *klass)
 792 {
 793         mini_emit_class_check_inst (cfg, klass_reg, klass, NULL);
 794 }
 795
 796 #else
 797
 798 MONO_EMPTY_SOURCE_FILE (type_checking);
 799 #endif