245 assert(phase->C->get_alias_index(t) == phase->C->get_alias_index(t_adr), "correct memory chain");
246 }
247 }
248 return result;
249 }
250
251 static Node *step_through_mergemem(PhaseGVN *phase, MergeMemNode *mmem, const TypePtr *tp, const TypePtr *adr_check, outputStream *st) {
252 uint alias_idx = phase->C->get_alias_index(tp);
253 Node *mem = mmem;
254 #ifdef ASSERT
255 {
256 // Check that current type is consistent with the alias index used during graph construction
257 assert(alias_idx >= Compile::AliasIdxRaw, "must not be a bad alias_idx");
258 bool consistent = adr_check == nullptr || adr_check->empty() ||
259 phase->C->must_alias(adr_check, alias_idx );
260 // Sometimes dead array references collapse to a[-1], a[-2], or a[-3]
261 if( !consistent && adr_check != nullptr && !adr_check->empty() &&
262 tp->isa_aryptr() && tp->offset() == Type::OffsetBot &&
263 adr_check->isa_aryptr() && adr_check->offset() != Type::OffsetBot &&
264 ( adr_check->offset() == arrayOopDesc::length_offset_in_bytes() ||
265 adr_check->offset() == oopDesc::klass_offset_in_bytes() ||
266 adr_check->offset() == oopDesc::mark_offset_in_bytes() ) ) {
267 // don't assert if it is dead code.
268 consistent = true;
269 }
270 if( !consistent ) {
271 st->print("alias_idx==%d, adr_check==", alias_idx);
272 if( adr_check == nullptr ) {
273 st->print("null");
274 } else {
275 adr_check->dump();
276 }
277 st->cr();
278 print_alias_types();
279 assert(consistent, "adr_check must match alias idx");
280 }
281 }
282 #endif
283 // TypeOopPtr::NOTNULL+any is an OOP with unknown offset - generally
284 // means an array I have not precisely typed yet. Do not do any
285 // alias stuff with it any time soon.
933
934 for (size_t i = 0; i < sizeof offsets / sizeof offsets[0]; i++) {
935 if (offset == offsets[i]) {
936 return true;
937 }
938 }
939 }
940
941 return false;
942 }
943 #endif
944
945 //----------------------------LoadNode::make-----------------------------------
946 // Polymorphic factory method:
947 Node* LoadNode::make(PhaseGVN& gvn, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, const Type* rt, BasicType bt, MemOrd mo,
948 ControlDependency control_dependency, bool require_atomic_access, bool unaligned, bool mismatched, bool unsafe, uint8_t barrier_data) {
949 Compile* C = gvn.C;
950
951 // sanity check the alias category against the created node type
952 assert(!(adr_type->isa_oopptr() &&
953 adr_type->offset() == oopDesc::klass_offset_in_bytes()),
954 "use LoadKlassNode instead");
955 assert(!(adr_type->isa_aryptr() &&
956 adr_type->offset() == arrayOopDesc::length_offset_in_bytes()),
957 "use LoadRangeNode instead");
958 // Check control edge of raw loads
959 assert( ctl != nullptr || C->get_alias_index(adr_type) != Compile::AliasIdxRaw ||
960 // oop will be recorded in oop map if load crosses safepoint
961 rt->isa_oopptr() || is_immutable_value(adr),
962 "raw memory operations should have control edge");
963 LoadNode* load = nullptr;
964 switch (bt) {
965 case T_BOOLEAN: load = new LoadUBNode(ctl, mem, adr, adr_type, rt->is_int(), mo, control_dependency); break;
966 case T_BYTE: load = new LoadBNode (ctl, mem, adr, adr_type, rt->is_int(), mo, control_dependency); break;
967 case T_INT: load = new LoadINode (ctl, mem, adr, adr_type, rt->is_int(), mo, control_dependency); break;
968 case T_CHAR: load = new LoadUSNode(ctl, mem, adr, adr_type, rt->is_int(), mo, control_dependency); break;
969 case T_SHORT: load = new LoadSNode (ctl, mem, adr, adr_type, rt->is_int(), mo, control_dependency); break;
970 case T_LONG: load = new LoadLNode (ctl, mem, adr, adr_type, rt->is_long(), mo, control_dependency, require_atomic_access); break;
971 case T_FLOAT: load = new LoadFNode (ctl, mem, adr, adr_type, rt, mo, control_dependency); break;
972 case T_DOUBLE: load = new LoadDNode (ctl, mem, adr, adr_type, rt, mo, control_dependency, require_atomic_access); break;
973 case T_ADDRESS: load = new LoadPNode (ctl, mem, adr, adr_type, rt->is_ptr(), mo, control_dependency); break;
2444 // constant oop => constant klass
2445 if (offset == java_lang_Class::array_klass_offset()) {
2446 if (t->is_void()) {
2447 // We cannot create a void array. Since void is a primitive type return null
2448 // klass. Users of this result need to do a null check on the returned klass.
2449 return TypePtr::NULL_PTR;
2450 }
2451 return TypeKlassPtr::make(ciArrayKlass::make(t), Type::trust_interfaces);
2452 }
2453 if (!t->is_klass()) {
2454 // a primitive Class (e.g., int.class) has null for a klass field
2455 return TypePtr::NULL_PTR;
2456 }
2457 // Fold up the load of the hidden field
2458 return TypeKlassPtr::make(t->as_klass(), Type::trust_interfaces);
2459 }
2460 // non-constant mirror, so we can't tell what's going on
2461 }
2462 if (!tinst->is_loaded())
2463 return _type; // Bail out if not loaded
2464 if (offset == oopDesc::klass_offset_in_bytes()) {
2465 return tinst->as_klass_type(true);
2466 }
2467 }
2468
2469 // Check for loading klass from an array
2470 const TypeAryPtr *tary = tp->isa_aryptr();
2471 if (tary != nullptr &&
2472 tary->offset() == oopDesc::klass_offset_in_bytes()) {
2473 return tary->as_klass_type(true);
2474 }
2475
2476 // Check for loading klass from an array klass
2477 const TypeKlassPtr *tkls = tp->isa_klassptr();
2478 if (tkls != nullptr && !StressReflectiveCode) {
2479 if (!tkls->is_loaded())
2480 return _type; // Bail out if not loaded
2481 if (tkls->isa_aryklassptr() && tkls->is_aryklassptr()->elem()->isa_klassptr() &&
2482 tkls->offset() == in_bytes(ObjArrayKlass::element_klass_offset())) {
2483 // // Always returning precise element type is incorrect,
2484 // // e.g., element type could be object and array may contain strings
2485 // return TypeKlassPtr::make(TypePtr::Constant, elem, 0);
2486
2487 // The array's TypeKlassPtr was declared 'precise' or 'not precise'
2488 // according to the element type's subclassing.
2489 return tkls->is_aryklassptr()->elem()->isa_klassptr()->cast_to_exactness(tkls->klass_is_exact());
2490 }
2491 if (tkls->isa_instklassptr() != nullptr && tkls->klass_is_exact() &&
2492 tkls->offset() == in_bytes(Klass::super_offset())) {
2518 Node* x = LoadNode::Identity(phase);
2519 if (x != this) return x;
2520
2521 // Take apart the address into an oop and offset.
2522 // Return 'this' if we cannot.
2523 Node* adr = in(MemNode::Address);
2524 intptr_t offset = 0;
2525 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset);
2526 if (base == nullptr) return this;
2527 const TypeOopPtr* toop = phase->type(adr)->isa_oopptr();
2528 if (toop == nullptr) return this;
2529
2530 // Step over potential GC barrier for OopHandle resolve
2531 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
2532 if (bs->is_gc_barrier_node(base)) {
2533 base = bs->step_over_gc_barrier(base);
2534 }
2535
2536 // We can fetch the klass directly through an AllocateNode.
2537 // This works even if the klass is not constant (clone or newArray).
2538 if (offset == oopDesc::klass_offset_in_bytes()) {
2539 Node* allocated_klass = AllocateNode::Ideal_klass(base, phase);
2540 if (allocated_klass != nullptr) {
2541 return allocated_klass;
2542 }
2543 }
2544
2545 // Simplify k.java_mirror.as_klass to plain k, where k is a Klass*.
2546 // See inline_native_Class_query for occurrences of these patterns.
2547 // Java Example: x.getClass().isAssignableFrom(y)
2548 //
2549 // This improves reflective code, often making the Class
2550 // mirror go completely dead. (Current exception: Class
2551 // mirrors may appear in debug info, but we could clean them out by
2552 // introducing a new debug info operator for Klass.java_mirror).
2553
2554 if (toop->isa_instptr() && toop->is_instptr()->instance_klass() == phase->C->env()->Class_klass()
2555 && offset == java_lang_Class::klass_offset()) {
2556 if (base->is_Load()) {
2557 Node* base2 = base->in(MemNode::Address);
2558 if (base2->is_Load()) { /* direct load of a load which is the OopHandle */
|
245 assert(phase->C->get_alias_index(t) == phase->C->get_alias_index(t_adr), "correct memory chain");
246 }
247 }
248 return result;
249 }
250
251 static Node *step_through_mergemem(PhaseGVN *phase, MergeMemNode *mmem, const TypePtr *tp, const TypePtr *adr_check, outputStream *st) {
252 uint alias_idx = phase->C->get_alias_index(tp);
253 Node *mem = mmem;
254 #ifdef ASSERT
255 {
256 // Check that current type is consistent with the alias index used during graph construction
257 assert(alias_idx >= Compile::AliasIdxRaw, "must not be a bad alias_idx");
258 bool consistent = adr_check == nullptr || adr_check->empty() ||
259 phase->C->must_alias(adr_check, alias_idx );
260 // Sometimes dead array references collapse to a[-1], a[-2], or a[-3]
261 if( !consistent && adr_check != nullptr && !adr_check->empty() &&
262 tp->isa_aryptr() && tp->offset() == Type::OffsetBot &&
263 adr_check->isa_aryptr() && adr_check->offset() != Type::OffsetBot &&
264 ( adr_check->offset() == arrayOopDesc::length_offset_in_bytes() ||
265 adr_check->offset() == Type::klass_offset() ||
266 adr_check->offset() == oopDesc::mark_offset_in_bytes() ) ) {
267 // don't assert if it is dead code.
268 consistent = true;
269 }
270 if( !consistent ) {
271 st->print("alias_idx==%d, adr_check==", alias_idx);
272 if( adr_check == nullptr ) {
273 st->print("null");
274 } else {
275 adr_check->dump();
276 }
277 st->cr();
278 print_alias_types();
279 assert(consistent, "adr_check must match alias idx");
280 }
281 }
282 #endif
283 // TypeOopPtr::NOTNULL+any is an OOP with unknown offset - generally
284 // means an array I have not precisely typed yet. Do not do any
285 // alias stuff with it any time soon.
933
934 for (size_t i = 0; i < sizeof offsets / sizeof offsets[0]; i++) {
935 if (offset == offsets[i]) {
936 return true;
937 }
938 }
939 }
940
941 return false;
942 }
943 #endif
944
945 //----------------------------LoadNode::make-----------------------------------
946 // Polymorphic factory method:
947 Node* LoadNode::make(PhaseGVN& gvn, Node* ctl, Node* mem, Node* adr, const TypePtr* adr_type, const Type* rt, BasicType bt, MemOrd mo,
948 ControlDependency control_dependency, bool require_atomic_access, bool unaligned, bool mismatched, bool unsafe, uint8_t barrier_data) {
949 Compile* C = gvn.C;
950
951 // sanity check the alias category against the created node type
952 assert(!(adr_type->isa_oopptr() &&
953 adr_type->offset() == Type::klass_offset()),
954 "use LoadKlassNode instead");
955 assert(!(adr_type->isa_aryptr() &&
956 adr_type->offset() == arrayOopDesc::length_offset_in_bytes()),
957 "use LoadRangeNode instead");
958 // Check control edge of raw loads
959 assert( ctl != nullptr || C->get_alias_index(adr_type) != Compile::AliasIdxRaw ||
960 // oop will be recorded in oop map if load crosses safepoint
961 rt->isa_oopptr() || is_immutable_value(adr),
962 "raw memory operations should have control edge");
963 LoadNode* load = nullptr;
964 switch (bt) {
965 case T_BOOLEAN: load = new LoadUBNode(ctl, mem, adr, adr_type, rt->is_int(), mo, control_dependency); break;
966 case T_BYTE: load = new LoadBNode (ctl, mem, adr, adr_type, rt->is_int(), mo, control_dependency); break;
967 case T_INT: load = new LoadINode (ctl, mem, adr, adr_type, rt->is_int(), mo, control_dependency); break;
968 case T_CHAR: load = new LoadUSNode(ctl, mem, adr, adr_type, rt->is_int(), mo, control_dependency); break;
969 case T_SHORT: load = new LoadSNode (ctl, mem, adr, adr_type, rt->is_int(), mo, control_dependency); break;
970 case T_LONG: load = new LoadLNode (ctl, mem, adr, adr_type, rt->is_long(), mo, control_dependency, require_atomic_access); break;
971 case T_FLOAT: load = new LoadFNode (ctl, mem, adr, adr_type, rt, mo, control_dependency); break;
972 case T_DOUBLE: load = new LoadDNode (ctl, mem, adr, adr_type, rt, mo, control_dependency, require_atomic_access); break;
973 case T_ADDRESS: load = new LoadPNode (ctl, mem, adr, adr_type, rt->is_ptr(), mo, control_dependency); break;
2444 // constant oop => constant klass
2445 if (offset == java_lang_Class::array_klass_offset()) {
2446 if (t->is_void()) {
2447 // We cannot create a void array. Since void is a primitive type return null
2448 // klass. Users of this result need to do a null check on the returned klass.
2449 return TypePtr::NULL_PTR;
2450 }
2451 return TypeKlassPtr::make(ciArrayKlass::make(t), Type::trust_interfaces);
2452 }
2453 if (!t->is_klass()) {
2454 // a primitive Class (e.g., int.class) has null for a klass field
2455 return TypePtr::NULL_PTR;
2456 }
2457 // Fold up the load of the hidden field
2458 return TypeKlassPtr::make(t->as_klass(), Type::trust_interfaces);
2459 }
2460 // non-constant mirror, so we can't tell what's going on
2461 }
2462 if (!tinst->is_loaded())
2463 return _type; // Bail out if not loaded
2464 if (offset == Type::klass_offset()) {
2465 return tinst->as_klass_type(true);
2466 }
2467 }
2468
2469 // Check for loading klass from an array
2470 const TypeAryPtr *tary = tp->isa_aryptr();
2471 if (tary != nullptr &&
2472 tary->offset() == Type::klass_offset()) {
2473 return tary->as_klass_type(true);
2474 }
2475
2476 // Check for loading klass from an array klass
2477 const TypeKlassPtr *tkls = tp->isa_klassptr();
2478 if (tkls != nullptr && !StressReflectiveCode) {
2479 if (!tkls->is_loaded())
2480 return _type; // Bail out if not loaded
2481 if (tkls->isa_aryklassptr() && tkls->is_aryklassptr()->elem()->isa_klassptr() &&
2482 tkls->offset() == in_bytes(ObjArrayKlass::element_klass_offset())) {
2483 // // Always returning precise element type is incorrect,
2484 // // e.g., element type could be object and array may contain strings
2485 // return TypeKlassPtr::make(TypePtr::Constant, elem, 0);
2486
2487 // The array's TypeKlassPtr was declared 'precise' or 'not precise'
2488 // according to the element type's subclassing.
2489 return tkls->is_aryklassptr()->elem()->isa_klassptr()->cast_to_exactness(tkls->klass_is_exact());
2490 }
2491 if (tkls->isa_instklassptr() != nullptr && tkls->klass_is_exact() &&
2492 tkls->offset() == in_bytes(Klass::super_offset())) {
2518 Node* x = LoadNode::Identity(phase);
2519 if (x != this) return x;
2520
2521 // Take apart the address into an oop and offset.
2522 // Return 'this' if we cannot.
2523 Node* adr = in(MemNode::Address);
2524 intptr_t offset = 0;
2525 Node* base = AddPNode::Ideal_base_and_offset(adr, phase, offset);
2526 if (base == nullptr) return this;
2527 const TypeOopPtr* toop = phase->type(adr)->isa_oopptr();
2528 if (toop == nullptr) return this;
2529
2530 // Step over potential GC barrier for OopHandle resolve
2531 BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
2532 if (bs->is_gc_barrier_node(base)) {
2533 base = bs->step_over_gc_barrier(base);
2534 }
2535
2536 // We can fetch the klass directly through an AllocateNode.
2537 // This works even if the klass is not constant (clone or newArray).
2538 if (offset == Type::klass_offset()) {
2539 Node* allocated_klass = AllocateNode::Ideal_klass(base, phase);
2540 if (allocated_klass != nullptr) {
2541 return allocated_klass;
2542 }
2543 }
2544
2545 // Simplify k.java_mirror.as_klass to plain k, where k is a Klass*.
2546 // See inline_native_Class_query for occurrences of these patterns.
2547 // Java Example: x.getClass().isAssignableFrom(y)
2548 //
2549 // This improves reflective code, often making the Class
2550 // mirror go completely dead. (Current exception: Class
2551 // mirrors may appear in debug info, but we could clean them out by
2552 // introducing a new debug info operator for Klass.java_mirror).
2553
2554 if (toop->isa_instptr() && toop->is_instptr()->instance_klass() == phase->C->env()->Class_klass()
2555 && offset == java_lang_Class::klass_offset()) {
2556 if (base->is_Load()) {
2557 Node* base2 = base->in(MemNode::Address);
2558 if (base2->is_Load()) { /* direct load of a load which is the OopHandle */
|