| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "method_handles-inl.h" |
| |
| #include "android-base/macros.h" |
| #include "android-base/stringprintf.h" |
| #include "class_root-inl.h" |
| #include "common_dex_operations.h" |
| #include "common_throws.h" |
| #include "interpreter/shadow_frame-inl.h" |
| #include "interpreter/shadow_frame.h" |
| #include "jvalue-inl.h" |
| #include "mirror/class-inl.h" |
| #include "mirror/emulated_stack_frame-inl.h" |
| #include "mirror/emulated_stack_frame.h" |
| #include "mirror/method_handle_impl-inl.h" |
| #include "mirror/method_handle_impl.h" |
| #include "mirror/method_type-inl.h" |
| #include "mirror/var_handle.h" |
| #include "reflection-inl.h" |
| #include "reflection.h" |
| #include "thread.h" |
| #include "var_handles.h" |
| #include "well_known_classes.h" |
| |
| namespace art { |
| |
| using android::base::StringPrintf; |
| |
| namespace { |
| |
| #define PRIMITIVES_LIST(V) \ |
| V(Primitive::kPrimBoolean, Boolean, Boolean, Z) \ |
| V(Primitive::kPrimByte, Byte, Byte, B) \ |
| V(Primitive::kPrimChar, Char, Character, C) \ |
| V(Primitive::kPrimShort, Short, Short, S) \ |
| V(Primitive::kPrimInt, Int, Integer, I) \ |
| V(Primitive::kPrimLong, Long, Long, J) \ |
| V(Primitive::kPrimFloat, Float, Float, F) \ |
| V(Primitive::kPrimDouble, Double, Double, D) |
| |
| // Assigns |type| to the primitive type associated with |klass|. Returns |
| // true iff. |klass| was a boxed type (Integer, Long etc.), false otherwise. |
| bool GetUnboxedPrimitiveType(ObjPtr<mirror::Class> klass, Primitive::Type* type) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| ScopedAssertNoThreadSuspension ants(__FUNCTION__); |
| std::string storage; |
| const char* descriptor = klass->GetDescriptor(&storage); |
| static const char kJavaLangPrefix[] = "Ljava/lang/"; |
| static const size_t kJavaLangPrefixSize = sizeof(kJavaLangPrefix) - 1; |
| if (strncmp(descriptor, kJavaLangPrefix, kJavaLangPrefixSize) != 0) { |
| return false; |
| } |
| |
| descriptor += kJavaLangPrefixSize; |
| #define LOOKUP_PRIMITIVE(primitive, _, java_name, ___) \ |
| if (strcmp(descriptor, #java_name ";") == 0) { \ |
| *type = primitive; \ |
| return true; \ |
| } |
| |
| PRIMITIVES_LIST(LOOKUP_PRIMITIVE); |
| #undef LOOKUP_PRIMITIVE |
| return false; |
| } |
| |
| ObjPtr<mirror::Class> GetBoxedPrimitiveClass(Primitive::Type type) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| ScopedAssertNoThreadSuspension ants(__FUNCTION__); |
| jmethodID m = nullptr; |
| switch (type) { |
| #define CASE_PRIMITIVE(primitive, _, java_name, __) \ |
| case primitive: \ |
| m = WellKnownClasses::java_lang_ ## java_name ## _valueOf; \ |
| break; |
| PRIMITIVES_LIST(CASE_PRIMITIVE); |
| #undef CASE_PRIMITIVE |
| case Primitive::Type::kPrimNot: |
| case Primitive::Type::kPrimVoid: |
| return nullptr; |
| } |
| return jni::DecodeArtMethod(m)->GetDeclaringClass(); |
| } |
| |
| bool GetUnboxedTypeAndValue(ObjPtr<mirror::Object> o, Primitive::Type* type, JValue* value) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| ScopedAssertNoThreadSuspension ants(__FUNCTION__); |
| ObjPtr<mirror::Class> klass = o->GetClass(); |
| ArtField* primitive_field = &klass->GetIFieldsPtr()->At(0); |
| #define CASE_PRIMITIVE(primitive, abbrev, _, shorthand) \ |
| if (klass == GetBoxedPrimitiveClass(primitive)) { \ |
| *type = primitive; \ |
| value->Set ## shorthand(primitive_field->Get ## abbrev(o)); \ |
| return true; \ |
| } |
| PRIMITIVES_LIST(CASE_PRIMITIVE) |
| #undef CASE_PRIMITIVE |
| return false; |
| } |
| |
| inline bool IsReferenceType(Primitive::Type type) { |
| return type == Primitive::kPrimNot; |
| } |
| |
| inline bool IsPrimitiveType(Primitive::Type type) { |
| return !IsReferenceType(type); |
| } |
| |
| } // namespace |
| |
| bool IsParameterTypeConvertible(ObjPtr<mirror::Class> from, ObjPtr<mirror::Class> to) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| // This function returns true if there's any conceivable conversion |
| // between |from| and |to|. It's expected this method will be used |
| // to determine if a WrongMethodTypeException should be raised. The |
| // decision logic follows the documentation for MethodType.asType(). |
| if (from == to) { |
| return true; |
| } |
| |
| Primitive::Type from_primitive = from->GetPrimitiveType(); |
| Primitive::Type to_primitive = to->GetPrimitiveType(); |
| DCHECK(from_primitive != Primitive::Type::kPrimVoid); |
| DCHECK(to_primitive != Primitive::Type::kPrimVoid); |
| |
| // If |to| and |from| are references. |
| if (IsReferenceType(from_primitive) && IsReferenceType(to_primitive)) { |
| // Assignability is determined during parameter conversion when |
| // invoking the associated method handle. |
| return true; |
| } |
| |
| // If |to| and |from| are primitives and a widening conversion exists. |
| if (Primitive::IsWidenable(from_primitive, to_primitive)) { |
| return true; |
| } |
| |
| // If |to| is a reference and |from| is a primitive, then boxing conversion. |
| if (IsReferenceType(to_primitive) && IsPrimitiveType(from_primitive)) { |
| return to->IsAssignableFrom(GetBoxedPrimitiveClass(from_primitive)); |
| } |
| |
| // If |from| is a reference and |to| is a primitive, then unboxing conversion. |
| if (IsPrimitiveType(to_primitive) && IsReferenceType(from_primitive)) { |
| if (from->DescriptorEquals("Ljava/lang/Object;")) { |
| // Object might be converted into a primitive during unboxing. |
| return true; |
| } |
| |
| if (Primitive::IsNumericType(to_primitive) && from->DescriptorEquals("Ljava/lang/Number;")) { |
| // Number might be unboxed into any of the number primitive types. |
| return true; |
| } |
| |
| Primitive::Type unboxed_type; |
| if (GetUnboxedPrimitiveType(from, &unboxed_type)) { |
| if (unboxed_type == to_primitive) { |
| // Straightforward unboxing conversion such as Boolean => boolean. |
| return true; |
| } |
| |
| // Check if widening operations for numeric primitives would work, |
| // such as Byte => byte => long. |
| return Primitive::IsWidenable(unboxed_type, to_primitive); |
| } |
| } |
| |
| return false; |
| } |
| |
| bool IsReturnTypeConvertible(ObjPtr<mirror::Class> from, ObjPtr<mirror::Class> to) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (to->GetPrimitiveType() == Primitive::Type::kPrimVoid) { |
| // Result will be ignored. |
| return true; |
| } else if (from->GetPrimitiveType() == Primitive::Type::kPrimVoid) { |
| // Returned value will be 0 / null. |
| return true; |
| } else { |
| // Otherwise apply usual parameter conversion rules. |
| return IsParameterTypeConvertible(from, to); |
| } |
| } |
| |
| bool ConvertJValueCommon( |
| Handle<mirror::MethodType> callsite_type, |
| Handle<mirror::MethodType> callee_type, |
| ObjPtr<mirror::Class> from, |
| ObjPtr<mirror::Class> to, |
| JValue* value) { |
| // The reader maybe concerned about the safety of the heap object |
| // that may be in |value|. There is only one case where allocation |
| // is obviously needed and that's for boxing. However, in the case |
| // of boxing |value| contains a non-reference type. |
| |
| const Primitive::Type from_type = from->GetPrimitiveType(); |
| const Primitive::Type to_type = to->GetPrimitiveType(); |
| |
| // Put incoming value into |src_value| and set return value to 0. |
| // Errors and conversions from void require the return value to be 0. |
| const JValue src_value(*value); |
| value->SetJ(0); |
| |
| // Conversion from void set result to zero. |
| if (from_type == Primitive::kPrimVoid) { |
| return true; |
| } |
| |
| // This method must be called only when the types don't match. |
| DCHECK(from != to); |
| |
| if (IsPrimitiveType(from_type) && IsPrimitiveType(to_type)) { |
| // The source and target types are both primitives. |
| if (UNLIKELY(!ConvertPrimitiveValueNoThrow(from_type, to_type, src_value, value))) { |
| ThrowWrongMethodTypeException(callee_type.Get(), callsite_type.Get()); |
| return false; |
| } |
| return true; |
| } else if (IsReferenceType(from_type) && IsReferenceType(to_type)) { |
| // They're both reference types. If "from" is null, we can pass it |
| // through unchanged. If not, we must generate a cast exception if |
| // |to| is not assignable from the dynamic type of |ref|. |
| // |
| // Playing it safe with StackHandleScope here, not expecting any allocation |
| // in mirror::Class::IsAssignable(). |
| StackHandleScope<2> hs(Thread::Current()); |
| Handle<mirror::Class> h_to(hs.NewHandle(to)); |
| Handle<mirror::Object> h_obj(hs.NewHandle(src_value.GetL())); |
| if (UNLIKELY(!h_obj.IsNull() && !to->IsAssignableFrom(h_obj->GetClass()))) { |
| ThrowClassCastException(h_to.Get(), h_obj->GetClass()); |
| return false; |
| } |
| value->SetL(h_obj.Get()); |
| return true; |
| } else if (IsReferenceType(to_type)) { |
| DCHECK(IsPrimitiveType(from_type)); |
| // The source type is a primitive and the target type is a reference, so we must box. |
| // The target type maybe a super class of the boxed source type, for example, |
| // if the source type is int, it's boxed type is java.lang.Integer, and the target |
| // type could be java.lang.Number. |
| Primitive::Type type; |
| if (!GetUnboxedPrimitiveType(to, &type)) { |
| ObjPtr<mirror::Class> boxed_from_class = GetBoxedPrimitiveClass(from_type); |
| if (LIKELY(boxed_from_class->IsSubClass(to))) { |
| type = from_type; |
| } else { |
| ThrowWrongMethodTypeException(callee_type.Get(), callsite_type.Get()); |
| return false; |
| } |
| } |
| |
| if (UNLIKELY(from_type != type)) { |
| ThrowWrongMethodTypeException(callee_type.Get(), callsite_type.Get()); |
| return false; |
| } |
| |
| if (UNLIKELY(!ConvertPrimitiveValueNoThrow(from_type, type, src_value, value))) { |
| ThrowWrongMethodTypeException(callee_type.Get(), callsite_type.Get()); |
| return false; |
| } |
| |
| // Then perform the actual boxing, and then set the reference. |
| ObjPtr<mirror::Object> boxed = BoxPrimitive(type, src_value); |
| value->SetL(boxed); |
| return true; |
| } else { |
| // The source type is a reference and the target type is a primitive, so we must unbox. |
| DCHECK(IsReferenceType(from_type)); |
| DCHECK(IsPrimitiveType(to_type)); |
| |
| ObjPtr<mirror::Object> from_obj(src_value.GetL()); |
| if (UNLIKELY(from_obj.IsNull())) { |
| ThrowNullPointerException( |
| StringPrintf("Expected to unbox a '%s' primitive type but was returned null", |
| from->PrettyDescriptor().c_str()).c_str()); |
| return false; |
| } |
| |
| Primitive::Type unboxed_type; |
| JValue unboxed_value; |
| if (UNLIKELY(!GetUnboxedTypeAndValue(from_obj, &unboxed_type, &unboxed_value))) { |
| ThrowWrongMethodTypeException(callee_type.Get(), callsite_type.Get()); |
| return false; |
| } |
| |
| if (UNLIKELY(!ConvertPrimitiveValueNoThrow(unboxed_type, to_type, unboxed_value, value))) { |
| if (from->IsAssignableFrom(GetBoxedPrimitiveClass(to_type))) { |
| // CallSite may be Number, but the Number object is |
| // incompatible, e.g. Number (Integer) for a short. |
| ThrowClassCastException(from, to); |
| } else { |
| // CallSite is incompatible, e.g. Integer for a short. |
| ThrowWrongMethodTypeException(callee_type.Get(), callsite_type.Get()); |
| } |
| return false; |
| } |
| |
| return true; |
| } |
| } |
| |
| namespace { |
| |
| inline void CopyArgumentsFromCallerFrame(const ShadowFrame& caller_frame, |
| ShadowFrame* callee_frame, |
| const InstructionOperands* const operands, |
| const size_t first_dst_reg) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| for (size_t i = 0; i < operands->GetNumberOfOperands(); ++i) { |
| size_t dst_reg = first_dst_reg + i; |
| size_t src_reg = operands->GetOperand(i); |
| // Uint required, so that sign extension does not make this wrong on 64-bit systems |
| uint32_t src_value = caller_frame.GetVReg(src_reg); |
| ObjPtr<mirror::Object> o = caller_frame.GetVRegReference<kVerifyNone>(src_reg); |
| // If both register locations contains the same value, the register probably holds a reference. |
| // Note: As an optimization, non-moving collectors leave a stale reference value |
| // in the references array even after the original vreg was overwritten to a non-reference. |
| if (src_value == reinterpret_cast<uintptr_t>(o.Ptr())) { |
| callee_frame->SetVRegReference(dst_reg, o); |
| } else { |
| callee_frame->SetVReg(dst_reg, src_value); |
| } |
| } |
| } |
| |
| // Calculate the number of ins for a proxy or native method, where we |
| // can't just look at the code item. |
| static inline size_t GetInsForProxyOrNativeMethod(ArtMethod* method) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| DCHECK(method->IsNative() || method->IsProxyMethod()); |
| method = method->GetInterfaceMethodIfProxy(kRuntimePointerSize); |
| uint32_t shorty_length = 0; |
| const char* shorty = method->GetShorty(&shorty_length); |
| |
| // Static methods do not include the receiver. The receiver isn't included |
| // in the shorty_length though the return value is. |
| size_t num_ins = method->IsStatic() ? shorty_length - 1 : shorty_length; |
| for (const char* c = shorty + 1; *c != '\0'; ++c) { |
| if (*c == 'J' || *c == 'D') { |
| ++num_ins; |
| } |
| } |
| return num_ins; |
| } |
| |
| static inline bool MethodHandleInvokeTransform(Thread* self, |
| ShadowFrame& shadow_frame, |
| Handle<mirror::MethodHandle> method_handle, |
| Handle<mirror::MethodType> callsite_type, |
| const InstructionOperands* const operands, |
| JValue* result) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| // This can be fixed to two, because the method we're calling here |
| // (MethodHandle.transformInternal) doesn't have any locals and the signature |
| // is known : |
| // |
| // private MethodHandle.transformInternal(EmulatedStackFrame sf); |
| // |
| // This means we need only two vregs : |
| // - One for the method_handle object. |
| // - One for the only method argument (an EmulatedStackFrame). |
| static constexpr size_t kNumRegsForTransform = 2; |
| |
| ArtMethod* called_method = method_handle->GetTargetMethod(); |
| CodeItemDataAccessor accessor(called_method->DexInstructionData()); |
| DCHECK_EQ(kNumRegsForTransform, accessor.RegistersSize()); |
| DCHECK_EQ(kNumRegsForTransform, accessor.InsSize()); |
| |
| StackHandleScope<2> hs(self); |
| Handle<mirror::MethodType> callee_type(hs.NewHandle(method_handle->GetMethodType())); |
| Handle<mirror::EmulatedStackFrame> sf( |
| hs.NewHandle<mirror::EmulatedStackFrame>( |
| mirror::EmulatedStackFrame::CreateFromShadowFrameAndArgs( |
| self, callsite_type, callee_type, shadow_frame, operands))); |
| if (sf == nullptr) { |
| DCHECK(self->IsExceptionPending()); |
| return false; |
| } |
| |
| const char* old_cause = self->StartAssertNoThreadSuspension("MethodHandleInvokeTransform"); |
| ShadowFrameAllocaUniquePtr shadow_frame_unique_ptr = |
| CREATE_SHADOW_FRAME(kNumRegsForTransform, &shadow_frame, called_method, /* dex pc */ 0); |
| ShadowFrame* new_shadow_frame = shadow_frame_unique_ptr.get(); |
| new_shadow_frame->SetVRegReference(0, method_handle.Get()); |
| new_shadow_frame->SetVRegReference(1, sf.Get()); |
| self->EndAssertNoThreadSuspension(old_cause); |
| |
| PerformCall(self, |
| accessor, |
| shadow_frame.GetMethod(), |
| 0 /* first destination register */, |
| new_shadow_frame, |
| result, |
| interpreter::ShouldStayInSwitchInterpreter(called_method)); |
| if (self->IsExceptionPending()) { |
| return false; |
| } |
| |
| // If the called transformer method we called has returned a value, then we |
| // need to copy it back to |result|. |
| sf->GetReturnValue(self, result); |
| return true; |
| } |
| |
| inline static ObjPtr<mirror::Class> GetAndInitializeDeclaringClass(Thread* self, ArtField* field) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| // Method handle invocations on static fields should ensure class is |
| // initialized. This usually happens when an instance is constructed |
| // or class members referenced, but this is not guaranteed when |
| // looking up method handles. |
| ObjPtr<mirror::Class> klass = field->GetDeclaringClass(); |
| if (UNLIKELY(!klass->IsInitialized())) { |
| StackHandleScope<1> hs(self); |
| HandleWrapperObjPtr<mirror::Class> h(hs.NewHandleWrapper(&klass)); |
| if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(self, h, true, true)) { |
| DCHECK(self->IsExceptionPending()); |
| return nullptr; |
| } |
| } |
| return klass; |
| } |
| |
| ArtMethod* RefineTargetMethod(Thread* self, |
| ShadowFrame& shadow_frame, |
| const mirror::MethodHandle::Kind& handle_kind, |
| ObjPtr<mirror::MethodType> handle_type, |
| const uint32_t receiver_reg, |
| ArtMethod* target_method) REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (handle_kind == mirror::MethodHandle::Kind::kInvokeVirtual || |
| handle_kind == mirror::MethodHandle::Kind::kInvokeInterface) { |
| // For virtual and interface methods ensure target_method points to |
| // the actual method to invoke. |
| ObjPtr<mirror::Object> receiver(shadow_frame.GetVRegReference(receiver_reg)); |
| ObjPtr<mirror::Class> declaring_class(target_method->GetDeclaringClass()); |
| if (receiver == nullptr || receiver->GetClass() != declaring_class) { |
| // Verify that _vRegC is an object reference and of the type expected by |
| // the receiver. |
| if (!VerifyObjectIsClass(receiver, declaring_class)) { |
| DCHECK(self->IsExceptionPending()); |
| return nullptr; |
| } |
| return receiver->GetClass()->FindVirtualMethodForVirtualOrInterface( |
| target_method, kRuntimePointerSize); |
| } |
| } else if (handle_kind == mirror::MethodHandle::Kind::kInvokeDirect) { |
| // String constructors are a special case, they are replaced with |
| // StringFactory methods. |
| if (target_method->IsConstructor() && target_method->GetDeclaringClass()->IsStringClass()) { |
| DCHECK(handle_type->GetRType()->IsStringClass()); |
| return WellKnownClasses::StringInitToStringFactory(target_method); |
| } |
| } else if (handle_kind == mirror::MethodHandle::Kind::kInvokeSuper) { |
| // Note that we're not dynamically dispatching on the type of the receiver |
| // here. We use the static type of the "receiver" object that we've |
| // recorded in the method handle's type, which will be the same as the |
| // special caller that was specified at the point of lookup. |
| ObjPtr<mirror::Class> referrer_class = handle_type->GetPTypes()->Get(0); |
| ObjPtr<mirror::Class> declaring_class = target_method->GetDeclaringClass(); |
| if (referrer_class == declaring_class) { |
| return target_method; |
| } |
| if (declaring_class->IsInterface()) { |
| if (target_method->IsAbstract()) { |
| std::string msg = |
| "Method " + target_method->PrettyMethod() + " is abstract interface method!"; |
| ThrowIllegalAccessException(msg.c_str()); |
| return nullptr; |
| } |
| } else { |
| ObjPtr<mirror::Class> super_class = referrer_class->GetSuperClass(); |
| uint16_t vtable_index = target_method->GetMethodIndex(); |
| DCHECK(super_class != nullptr); |
| DCHECK(super_class->HasVTable()); |
| // Note that super_class is a super of referrer_class and target_method |
| // will always be declared by super_class (or one of its super classes). |
| DCHECK_LT(vtable_index, super_class->GetVTableLength()); |
| return super_class->GetVTableEntry(vtable_index, kRuntimePointerSize); |
| } |
| } |
| return target_method; |
| } |
| |
| // Helper for getters in invoke-polymorphic. |
| inline static void MethodHandleFieldGet(Thread* self, |
| const ShadowFrame& shadow_frame, |
| ObjPtr<mirror::Object>& obj, |
| ArtField* field, |
| Primitive::Type field_type, |
| JValue* result) REQUIRES_SHARED(Locks::mutator_lock_) { |
| switch (field_type) { |
| case Primitive::kPrimBoolean: |
| DoFieldGetCommon<Primitive::kPrimBoolean>(self, shadow_frame, obj, field, result); |
| break; |
| case Primitive::kPrimByte: |
| DoFieldGetCommon<Primitive::kPrimByte>(self, shadow_frame, obj, field, result); |
| break; |
| case Primitive::kPrimChar: |
| DoFieldGetCommon<Primitive::kPrimChar>(self, shadow_frame, obj, field, result); |
| break; |
| case Primitive::kPrimShort: |
| DoFieldGetCommon<Primitive::kPrimShort>(self, shadow_frame, obj, field, result); |
| break; |
| case Primitive::kPrimInt: |
| DoFieldGetCommon<Primitive::kPrimInt>(self, shadow_frame, obj, field, result); |
| break; |
| case Primitive::kPrimLong: |
| DoFieldGetCommon<Primitive::kPrimLong>(self, shadow_frame, obj, field, result); |
| break; |
| case Primitive::kPrimFloat: |
| DoFieldGetCommon<Primitive::kPrimInt>(self, shadow_frame, obj, field, result); |
| break; |
| case Primitive::kPrimDouble: |
| DoFieldGetCommon<Primitive::kPrimLong>(self, shadow_frame, obj, field, result); |
| break; |
| case Primitive::kPrimNot: |
| DoFieldGetCommon<Primitive::kPrimNot>(self, shadow_frame, obj, field, result); |
| break; |
| case Primitive::kPrimVoid: |
| LOG(FATAL) << "Unreachable: " << field_type; |
| UNREACHABLE(); |
| } |
| } |
| |
| // Helper for setters in invoke-polymorphic. |
| inline bool MethodHandleFieldPut(Thread* self, |
| ShadowFrame& shadow_frame, |
| ObjPtr<mirror::Object>& obj, |
| ArtField* field, |
| Primitive::Type field_type, |
| JValue& value) REQUIRES_SHARED(Locks::mutator_lock_) { |
| DCHECK(!Runtime::Current()->IsActiveTransaction()); |
| static const bool kTransaction = false; // Not in a transaction. |
| static const bool kAssignabilityCheck = false; // No access check. |
| switch (field_type) { |
| case Primitive::kPrimBoolean: |
| return |
| DoFieldPutCommon<Primitive::kPrimBoolean, kAssignabilityCheck, kTransaction>( |
| self, shadow_frame, obj, field, value); |
| case Primitive::kPrimByte: |
| return DoFieldPutCommon<Primitive::kPrimByte, kAssignabilityCheck, kTransaction>( |
| self, shadow_frame, obj, field, value); |
| case Primitive::kPrimChar: |
| return DoFieldPutCommon<Primitive::kPrimChar, kAssignabilityCheck, kTransaction>( |
| self, shadow_frame, obj, field, value); |
| case Primitive::kPrimShort: |
| return DoFieldPutCommon<Primitive::kPrimShort, kAssignabilityCheck, kTransaction>( |
| self, shadow_frame, obj, field, value); |
| case Primitive::kPrimInt: |
| case Primitive::kPrimFloat: |
| return DoFieldPutCommon<Primitive::kPrimInt, kAssignabilityCheck, kTransaction>( |
| self, shadow_frame, obj, field, value); |
| case Primitive::kPrimLong: |
| case Primitive::kPrimDouble: |
| return DoFieldPutCommon<Primitive::kPrimLong, kAssignabilityCheck, kTransaction>( |
| self, shadow_frame, obj, field, value); |
| case Primitive::kPrimNot: |
| return DoFieldPutCommon<Primitive::kPrimNot, kAssignabilityCheck, kTransaction>( |
| self, shadow_frame, obj, field, value); |
| case Primitive::kPrimVoid: |
| LOG(FATAL) << "Unreachable: " << field_type; |
| UNREACHABLE(); |
| } |
| } |
| |
| static JValue GetValueFromShadowFrame(const ShadowFrame& shadow_frame, |
| Primitive::Type field_type, |
| uint32_t vreg) REQUIRES_SHARED(Locks::mutator_lock_) { |
| JValue field_value; |
| switch (field_type) { |
| case Primitive::kPrimBoolean: |
| field_value.SetZ(static_cast<uint8_t>(shadow_frame.GetVReg(vreg))); |
| break; |
| case Primitive::kPrimByte: |
| field_value.SetB(static_cast<int8_t>(shadow_frame.GetVReg(vreg))); |
| break; |
| case Primitive::kPrimChar: |
| field_value.SetC(static_cast<uint16_t>(shadow_frame.GetVReg(vreg))); |
| break; |
| case Primitive::kPrimShort: |
| field_value.SetS(static_cast<int16_t>(shadow_frame.GetVReg(vreg))); |
| break; |
| case Primitive::kPrimInt: |
| case Primitive::kPrimFloat: |
| field_value.SetI(shadow_frame.GetVReg(vreg)); |
| break; |
| case Primitive::kPrimLong: |
| case Primitive::kPrimDouble: |
| field_value.SetJ(shadow_frame.GetVRegLong(vreg)); |
| break; |
| case Primitive::kPrimNot: |
| field_value.SetL(shadow_frame.GetVRegReference(vreg)); |
| break; |
| case Primitive::kPrimVoid: |
| LOG(FATAL) << "Unreachable: " << field_type; |
| UNREACHABLE(); |
| } |
| return field_value; |
| } |
| |
| bool MethodHandleFieldAccess(Thread* self, |
| ShadowFrame& shadow_frame, |
| Handle<mirror::MethodHandle> method_handle, |
| Handle<mirror::MethodType> callsite_type, |
| const InstructionOperands* const operands, |
| JValue* result) REQUIRES_SHARED(Locks::mutator_lock_) { |
| StackHandleScope<1> hs(self); |
| const mirror::MethodHandle::Kind handle_kind = method_handle->GetHandleKind(); |
| ArtField* field = method_handle->GetTargetField(); |
| Primitive::Type field_type = field->GetTypeAsPrimitiveType(); |
| switch (handle_kind) { |
| case mirror::MethodHandle::kInstanceGet: { |
| size_t obj_reg = operands->GetOperand(0); |
| ObjPtr<mirror::Object> obj = shadow_frame.GetVRegReference(obj_reg); |
| MethodHandleFieldGet(self, shadow_frame, obj, field, field_type, result); |
| return true; |
| } |
| case mirror::MethodHandle::kStaticGet: { |
| ObjPtr<mirror::Object> obj = GetAndInitializeDeclaringClass(self, field); |
| if (obj == nullptr) { |
| DCHECK(self->IsExceptionPending()); |
| return false; |
| } |
| MethodHandleFieldGet(self, shadow_frame, obj, field, field_type, result); |
| return true; |
| } |
| case mirror::MethodHandle::kInstancePut: { |
| size_t obj_reg = operands->GetOperand(0); |
| size_t value_reg = operands->GetOperand(1); |
| const size_t kPTypeIndex = 1; |
| // Use ptypes instead of field type since we may be unboxing a reference for a primitive |
| // field. The field type is incorrect for this case. |
| JValue value = GetValueFromShadowFrame( |
| shadow_frame, |
| callsite_type->GetPTypes()->Get(kPTypeIndex)->GetPrimitiveType(), |
| value_reg); |
| ObjPtr<mirror::Object> obj = shadow_frame.GetVRegReference(obj_reg); |
| return MethodHandleFieldPut(self, shadow_frame, obj, field, field_type, value); |
| } |
| case mirror::MethodHandle::kStaticPut: { |
| ObjPtr<mirror::Object> obj = GetAndInitializeDeclaringClass(self, field); |
| if (obj == nullptr) { |
| DCHECK(self->IsExceptionPending()); |
| return false; |
| } |
| size_t value_reg = operands->GetOperand(0); |
| const size_t kPTypeIndex = 0; |
| // Use ptypes instead of field type since we may be unboxing a reference for a primitive |
| // field. The field type is incorrect for this case. |
| JValue value = GetValueFromShadowFrame( |
| shadow_frame, |
| callsite_type->GetPTypes()->Get(kPTypeIndex)->GetPrimitiveType(), |
| value_reg); |
| return MethodHandleFieldPut(self, shadow_frame, obj, field, field_type, value); |
| } |
| default: |
| LOG(FATAL) << "Unreachable: " << handle_kind; |
| UNREACHABLE(); |
| } |
| } |
| |
| bool DoVarHandleInvokeTranslation(Thread* self, |
| ShadowFrame& shadow_frame, |
| Handle<mirror::MethodHandle> method_handle, |
| Handle<mirror::MethodType> callsite_type, |
| const InstructionOperands* const operands, |
| JValue* result) REQUIRES_SHARED(Locks::mutator_lock_) { |
| // |
| // Basic checks that apply in all cases. |
| // |
| StackHandleScope<6> hs(self); |
| Handle<mirror::ObjectArray<mirror::Class>> |
| callsite_ptypes(hs.NewHandle(callsite_type->GetPTypes())); |
| Handle<mirror::ObjectArray<mirror::Class>> |
| mh_ptypes(hs.NewHandle(method_handle->GetMethodType()->GetPTypes())); |
| |
| // Check that the first parameter is a VarHandle |
| if (callsite_ptypes->GetLength() < 1 || |
| !mh_ptypes->Get(0)->IsAssignableFrom(callsite_ptypes->Get(0)) || |
| mh_ptypes->Get(0) != GetClassRoot<mirror::VarHandle>()) { |
| ThrowWrongMethodTypeException(method_handle->GetMethodType(), callsite_type.Get()); |
| return false; |
| } |
| |
| // Get the receiver |
| ObjPtr<mirror::Object> receiver = shadow_frame.GetVRegReference(operands->GetOperand(0)); |
| if (receiver == nullptr) { |
| ThrowNullPointerException("Expected argument 1 to be a non-null VarHandle"); |
| return false; |
| } |
| |
| // Cast to VarHandle instance |
| Handle<mirror::VarHandle> vh(hs.NewHandle(ObjPtr<mirror::VarHandle>::DownCast(receiver))); |
| DCHECK(GetClassRoot<mirror::VarHandle>()->IsAssignableFrom(vh->GetClass())); |
| |
| // Determine the accessor kind to dispatch |
| ArtMethod* target_method = method_handle->GetTargetMethod(); |
| int intrinsic_index = target_method->GetIntrinsic(); |
| mirror::VarHandle::AccessMode access_mode = |
| mirror::VarHandle::GetAccessModeByIntrinsic(static_cast<Intrinsics>(intrinsic_index)); |
| Handle<mirror::MethodType> vh_type = |
| hs.NewHandle(vh->GetMethodTypeForAccessMode(self, access_mode)); |
| Handle<mirror::MethodType> mh_invoke_type = hs.NewHandle( |
| mirror::MethodType::CloneWithoutLeadingParameter(self, method_handle->GetMethodType())); |
| if (method_handle->GetHandleKind() == mirror::MethodHandle::Kind::kInvokeVarHandleExact) { |
| if (!mh_invoke_type->IsExactMatch(vh_type.Get())) { |
| ThrowWrongMethodTypeException(vh_type.Get(), mh_invoke_type.Get()); |
| return false; |
| } |
| } |
| |
| Handle<mirror::MethodType> callsite_type_without_varhandle = |
| hs.NewHandle(mirror::MethodType::CloneWithoutLeadingParameter(self, callsite_type.Get())); |
| NoReceiverInstructionOperands varhandle_operands(operands); |
| return VarHandleInvokeAccessor(self, |
| shadow_frame, |
| vh, |
| callsite_type_without_varhandle, |
| access_mode, |
| &varhandle_operands, |
| result); |
| } |
| |
| static bool DoMethodHandleInvokeMethod(Thread* self, |
| ShadowFrame& shadow_frame, |
| Handle<mirror::MethodHandle> method_handle, |
| const InstructionOperands* const operands, |
| JValue* result) REQUIRES_SHARED(Locks::mutator_lock_) { |
| ArtMethod* target_method = method_handle->GetTargetMethod(); |
| uint32_t receiver_reg = (operands->GetNumberOfOperands() > 0) ? operands->GetOperand(0) : 0u; |
| ArtMethod* called_method = RefineTargetMethod(self, |
| shadow_frame, |
| method_handle->GetHandleKind(), |
| method_handle->GetMethodType(), |
| receiver_reg, |
| target_method); |
| if (called_method == nullptr) { |
| DCHECK(self->IsExceptionPending()); |
| return false; |
| } |
| // Compute method information. |
| CodeItemDataAccessor accessor(called_method->DexInstructionData()); |
| uint16_t num_regs; |
| size_t first_dest_reg; |
| if (LIKELY(accessor.HasCodeItem())) { |
| num_regs = accessor.RegistersSize(); |
| first_dest_reg = num_regs - accessor.InsSize(); |
| // Parameter registers go at the end of the shadow frame. |
| DCHECK_NE(first_dest_reg, (size_t)-1); |
| } else { |
| // No local regs for proxy and native methods. |
| DCHECK(called_method->IsNative() || called_method->IsProxyMethod()); |
| num_regs = GetInsForProxyOrNativeMethod(called_method); |
| first_dest_reg = 0; |
| } |
| |
| const char* old_cause = self->StartAssertNoThreadSuspension("DoMethodHandleInvokeMethod"); |
| ShadowFrameAllocaUniquePtr shadow_frame_unique_ptr = |
| CREATE_SHADOW_FRAME(num_regs, &shadow_frame, called_method, /* dex pc */ 0); |
| ShadowFrame* new_shadow_frame = shadow_frame_unique_ptr.get(); |
| CopyArgumentsFromCallerFrame(shadow_frame, new_shadow_frame, operands, first_dest_reg); |
| self->EndAssertNoThreadSuspension(old_cause); |
| |
| PerformCall(self, |
| accessor, |
| shadow_frame.GetMethod(), |
| first_dest_reg, |
| new_shadow_frame, |
| result, |
| interpreter::ShouldStayInSwitchInterpreter(called_method)); |
| if (self->IsExceptionPending()) { |
| return false; |
| } |
| return true; |
| } |
| |
| static bool MethodHandleInvokeExactInternal(Thread* self, |
| ShadowFrame& shadow_frame, |
| Handle<mirror::MethodHandle> method_handle, |
| Handle<mirror::MethodType> callsite_type, |
| const InstructionOperands* const operands, |
| JValue* result) REQUIRES_SHARED(Locks::mutator_lock_) { |
| if (!callsite_type->IsExactMatch(method_handle->GetMethodType())) { |
| ThrowWrongMethodTypeException(method_handle->GetMethodType(), callsite_type.Get()); |
| return false; |
| } |
| |
| switch (method_handle->GetHandleKind()) { |
| case mirror::MethodHandle::Kind::kInvokeDirect: |
| case mirror::MethodHandle::Kind::kInvokeInterface: |
| case mirror::MethodHandle::Kind::kInvokeStatic: |
| case mirror::MethodHandle::Kind::kInvokeSuper: |
| case mirror::MethodHandle::Kind::kInvokeVirtual: |
| return DoMethodHandleInvokeMethod(self, shadow_frame, method_handle, operands, result); |
| case mirror::MethodHandle::Kind::kInstanceGet: |
| case mirror::MethodHandle::Kind::kInstancePut: |
| case mirror::MethodHandle::Kind::kStaticGet: |
| case mirror::MethodHandle::Kind::kStaticPut: |
| return MethodHandleFieldAccess( |
| self, shadow_frame, method_handle, callsite_type, operands, result); |
| case mirror::MethodHandle::Kind::kInvokeTransform: |
| return MethodHandleInvokeTransform( |
| self, shadow_frame, method_handle, callsite_type, operands, result); |
| case mirror::MethodHandle::Kind::kInvokeVarHandle: |
| case mirror::MethodHandle::Kind::kInvokeVarHandleExact: |
| return DoVarHandleInvokeTranslation( |
| self, shadow_frame, method_handle, callsite_type, operands, result); |
| } |
| } |
| |
| static bool MethodHandleInvokeInternal(Thread* self, |
| ShadowFrame& shadow_frame, |
| Handle<mirror::MethodHandle> method_handle, |
| Handle<mirror::MethodType> callsite_type, |
| const InstructionOperands* const operands, |
| JValue* result) REQUIRES_SHARED(Locks::mutator_lock_) { |
| StackHandleScope<2> hs(self); |
| Handle<mirror::MethodType> method_handle_type(hs.NewHandle(method_handle->GetMethodType())); |
| // Non-exact invoke behaves as calling mh.asType(newType). In ART, asType() is implemented |
| // as a transformer and it is expensive to call so check first if it's really necessary. |
| // |
| // There are two cases where the asType() transformation can be skipped: |
| // |
| // 1) the call site and type of the MethodHandle match, ie code is calling invoke() |
| // unnecessarily. |
| // |
| // 2) when the call site can be trivially converted to the MethodHandle type due to how |
| // values are represented in the ShadowFrame, ie all registers in the shadow frame are |
| // 32-bit, there is no byte, short, char, etc. So a call site with arguments of these |
| // kinds can be trivially converted to one with int arguments. Similarly if the reference |
| // types are assignable between the call site and MethodHandle type, then as asType() |
| // transformation isn't really doing any work. |
| // |
| // The following IsInPlaceConvertible check determines if either of these opportunities to |
| // skip asType() are true. |
| if (callsite_type->IsInPlaceConvertible(method_handle_type.Get())) { |
| return MethodHandleInvokeExact( |
| self, shadow_frame, method_handle, method_handle_type, operands, result); |
| } |
| |
| // Use asType() variant of this MethodHandle to adapt callsite to the target. |
| MutableHandle<mirror::MethodHandle> atc(hs.NewHandle(method_handle->GetAsTypeCache())); |
| if (atc == nullptr || !callsite_type->IsExactMatch(atc->GetMethodType())) { |
| // Cached asType adapter does not exist or is for another call site. Call |
| // MethodHandle::asType() to get an appropriate adapter. |
| ArtMethod* as_type = |
| jni::DecodeArtMethod(WellKnownClasses::java_lang_invoke_MethodHandle_asType); |
| uint32_t as_type_args[] = { |
| static_cast<uint32_t>(reinterpret_cast<uintptr_t>(method_handle.Get())), |
| static_cast<uint32_t>(reinterpret_cast<uintptr_t>(callsite_type.Get()))}; |
| JValue atc_result; |
| as_type->Invoke(self, as_type_args, sizeof(as_type_args), &atc_result, "LL"); |
| if (atc_result.GetL() == nullptr) { |
| DCHECK(self->IsExceptionPending()); |
| return false; |
| } |
| ObjPtr<mirror::MethodHandle> atc_method_handle = |
| down_cast<mirror::MethodHandle*>(atc_result.GetL()); |
| atc.Assign(atc_method_handle); |
| DCHECK(!atc.IsNull()); |
| } |
| |
| return MethodHandleInvokeExact(self, shadow_frame, atc, callsite_type, operands, result); |
| } |
| |
| } // namespace |
| |
| bool MethodHandleInvoke(Thread* self, |
| ShadowFrame& shadow_frame, |
| Handle<mirror::MethodHandle> method_handle, |
| Handle<mirror::MethodType> callsite_type, |
| const InstructionOperands* const operands, |
| JValue* result) REQUIRES_SHARED(Locks::mutator_lock_) { |
| return MethodHandleInvokeInternal( |
| self, shadow_frame, method_handle, callsite_type, operands, result); |
| } |
| |
| bool MethodHandleInvokeExact(Thread* self, |
| ShadowFrame& shadow_frame, |
| Handle<mirror::MethodHandle> method_handle, |
| Handle<mirror::MethodType> callsite_type, |
| const InstructionOperands* const operands, |
| JValue* result) REQUIRES_SHARED(Locks::mutator_lock_) { |
| return MethodHandleInvokeExactInternal( |
| self, shadow_frame, method_handle, callsite_type, operands, result); |
| } |
| |
| void MethodHandleInvokeExactWithFrame(Thread* self, |
| Handle<mirror::MethodHandle> method_handle, |
| Handle<mirror::EmulatedStackFrame> emulated_frame) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| StackHandleScope<1> hs(self); |
| Handle<mirror::MethodType> callsite_type = hs.NewHandle(emulated_frame->GetType()); |
| |
| // Copy arguments from the EmalatedStackFrame to a ShadowFrame. |
| const uint16_t num_vregs = callsite_type->NumberOfVRegs(); |
| |
| const char* old_cause = self->StartAssertNoThreadSuspension("EmulatedStackFrame to ShadowFrame"); |
| ArtMethod* invoke_exact = |
| jni::DecodeArtMethod(WellKnownClasses::java_lang_invoke_MethodHandle_invokeExact); |
| ShadowFrameAllocaUniquePtr shadow_frame = |
| CREATE_SHADOW_FRAME(num_vregs, /*link*/ nullptr, invoke_exact, /*dex_pc*/ 0); |
| emulated_frame->WriteToShadowFrame(self, callsite_type, 0, shadow_frame.get()); |
| self->EndAssertNoThreadSuspension(old_cause); |
| |
| ManagedStack fragment; |
| self->PushManagedStackFragment(&fragment); |
| self->PushShadowFrame(shadow_frame.get()); |
| |
| JValue result; |
| RangeInstructionOperands operands(0, num_vregs); |
| bool success = MethodHandleInvokeExact(self, |
| *shadow_frame.get(), |
| method_handle, |
| callsite_type, |
| &operands, |
| &result); |
| DCHECK_NE(success, self->IsExceptionPending()); |
| if (success) { |
| emulated_frame->SetReturnValue(self, result); |
| } |
| |
| self->PopShadowFrame(); |
| self->PopManagedStackFragment(fragment); |
| } |
| |
| } // namespace art |