| /* |
| * 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 "emulated_stack_frame.h" |
| |
| #include "class-inl.h" |
| #include "gc_root-inl.h" |
| #include "jvalue-inl.h" |
| #include "method_handles-inl.h" |
| #include "method_handles.h" |
| #include "reflection-inl.h" |
| |
| namespace art { |
| namespace mirror { |
| |
| GcRoot<mirror::Class> EmulatedStackFrame::static_class_; |
| |
| // Calculates the size of a stack frame based on the size of its argument |
| // types and return types. |
| static void CalculateFrameAndReferencesSize(ObjPtr<mirror::ObjectArray<mirror::Class>> p_types, |
| ObjPtr<mirror::Class> r_type, |
| size_t* frame_size_out, |
| size_t* references_size_out) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| const size_t length = p_types->GetLength(); |
| size_t frame_size = 0; |
| size_t references_size = 0; |
| for (size_t i = 0; i < length; ++i) { |
| ObjPtr<mirror::Class> type = p_types->GetWithoutChecks(i); |
| const Primitive::Type primitive_type = type->GetPrimitiveType(); |
| if (primitive_type == Primitive::kPrimNot) { |
| references_size++; |
| } else if (Primitive::Is64BitType(primitive_type)) { |
| frame_size += 8; |
| } else { |
| frame_size += 4; |
| } |
| } |
| |
| const Primitive::Type return_type = r_type->GetPrimitiveType(); |
| if (return_type == Primitive::kPrimNot) { |
| references_size++; |
| } else if (Primitive::Is64BitType(return_type)) { |
| frame_size += 8; |
| } else { |
| frame_size += 4; |
| } |
| |
| (*frame_size_out) = frame_size; |
| (*references_size_out) = references_size; |
| } |
| |
| // Allows for read or write access to an emulated stack frame. Each |
| // accessor index has an associated index into the references / stack frame |
| // arrays which is incremented on every read or write to the frame. |
| // |
| // This class is used in conjunction with PerformConversions, either as a setter |
| // or as a getter. |
| class EmulatedStackFrameAccessor { |
| public: |
| EmulatedStackFrameAccessor(Handle<mirror::ObjectArray<mirror::Object>> references, |
| Handle<mirror::ByteArray> stack_frame, |
| size_t stack_frame_size) : |
| references_(references), |
| stack_frame_(stack_frame), |
| stack_frame_size_(stack_frame_size), |
| reference_idx_(0u), |
| stack_frame_idx_(0u) { |
| } |
| |
| ALWAYS_INLINE void SetReference(ObjPtr<mirror::Object> reference) |
| REQUIRES_SHARED(Locks::mutator_lock_) { |
| references_->Set(reference_idx_++, reference); |
| } |
| |
| ALWAYS_INLINE void Set(const uint32_t value) REQUIRES_SHARED(Locks::mutator_lock_) { |
| int8_t* array = stack_frame_->GetData(); |
| |
| CHECK_LE((stack_frame_idx_ + 4u), stack_frame_size_); |
| memcpy(array + stack_frame_idx_, &value, sizeof(uint32_t)); |
| stack_frame_idx_ += 4u; |
| } |
| |
| ALWAYS_INLINE void SetLong(const int64_t value) REQUIRES_SHARED(Locks::mutator_lock_) { |
| int8_t* array = stack_frame_->GetData(); |
| |
| CHECK_LE((stack_frame_idx_ + 8u), stack_frame_size_); |
| memcpy(array + stack_frame_idx_, &value, sizeof(int64_t)); |
| stack_frame_idx_ += 8u; |
| } |
| |
| ALWAYS_INLINE ObjPtr<mirror::Object> GetReference() REQUIRES_SHARED(Locks::mutator_lock_) { |
| return ObjPtr<mirror::Object>(references_->Get(reference_idx_++)); |
| } |
| |
| ALWAYS_INLINE uint32_t Get() REQUIRES_SHARED(Locks::mutator_lock_) { |
| const int8_t* array = stack_frame_->GetData(); |
| |
| CHECK_LE((stack_frame_idx_ + 4u), stack_frame_size_); |
| uint32_t val = 0; |
| |
| memcpy(&val, array + stack_frame_idx_, sizeof(uint32_t)); |
| stack_frame_idx_ += 4u; |
| return val; |
| } |
| |
| ALWAYS_INLINE int64_t GetLong() REQUIRES_SHARED(Locks::mutator_lock_) { |
| const int8_t* array = stack_frame_->GetData(); |
| |
| CHECK_LE((stack_frame_idx_ + 8u), stack_frame_size_); |
| int64_t val = 0; |
| |
| memcpy(&val, array + stack_frame_idx_, sizeof(int64_t)); |
| stack_frame_idx_ += 8u; |
| return val; |
| } |
| |
| private: |
| Handle<mirror::ObjectArray<mirror::Object>> references_; |
| Handle<mirror::ByteArray> stack_frame_; |
| const size_t stack_frame_size_; |
| |
| size_t reference_idx_; |
| size_t stack_frame_idx_; |
| |
| DISALLOW_COPY_AND_ASSIGN(EmulatedStackFrameAccessor); |
| }; |
| |
| mirror::EmulatedStackFrame* EmulatedStackFrame::CreateFromShadowFrameAndArgs( |
| Thread* self, |
| Handle<mirror::MethodType> caller_type, |
| Handle<mirror::MethodType> callee_type, |
| const ShadowFrame& caller_frame, |
| const InstructionOperands* const operands) { |
| StackHandleScope<6> hs(self); |
| |
| // Step 1: We must throw a WrongMethodTypeException if there's a mismatch in the |
| // number of arguments between the caller and the callsite. |
| Handle<mirror::ObjectArray<mirror::Class>> from_types(hs.NewHandle(caller_type->GetPTypes())); |
| Handle<mirror::ObjectArray<mirror::Class>> to_types(hs.NewHandle(callee_type->GetPTypes())); |
| |
| const int32_t num_method_params = from_types->GetLength(); |
| if (to_types->GetLength() != num_method_params) { |
| ThrowWrongMethodTypeException(callee_type.Get(), caller_type.Get()); |
| return nullptr; |
| } |
| |
| // Step 2: Calculate the size of the reference / byte arrays in the emulated |
| // stack frame. |
| size_t frame_size = 0; |
| size_t refs_size = 0; |
| Handle<mirror::Class> r_type(hs.NewHandle(callee_type->GetRType())); |
| CalculateFrameAndReferencesSize(to_types.Get(), r_type.Get(), &frame_size, &refs_size); |
| |
| // Step 3 : Allocate the arrays. |
| ClassLinker* class_linker = Runtime::Current()->GetClassLinker(); |
| ObjPtr<mirror::Class> array_class(class_linker->GetClassRoot(ClassLinker::kObjectArrayClass)); |
| |
| Handle<mirror::ObjectArray<mirror::Object>> references(hs.NewHandle( |
| mirror::ObjectArray<mirror::Object>::Alloc(self, array_class, refs_size))); |
| if (references == nullptr) { |
| DCHECK(self->IsExceptionPending()); |
| return nullptr; |
| } |
| |
| Handle<ByteArray> stack_frame(hs.NewHandle(ByteArray::Alloc(self, frame_size))); |
| if (stack_frame == nullptr) { |
| DCHECK(self->IsExceptionPending()); |
| return nullptr; |
| } |
| |
| // Step 4 : Perform argument conversions (if required). |
| ShadowFrameGetter getter(operands, caller_frame); |
| EmulatedStackFrameAccessor setter(references, stack_frame, stack_frame->GetLength()); |
| if (!PerformConversions<ShadowFrameGetter, EmulatedStackFrameAccessor>( |
| self, caller_type, callee_type, &getter, &setter, num_method_params)) { |
| return nullptr; |
| } |
| |
| // Step 5: Construct the EmulatedStackFrame object. |
| Handle<EmulatedStackFrame> sf(hs.NewHandle( |
| ObjPtr<EmulatedStackFrame>::DownCast(StaticClass()->AllocObject(self)))); |
| sf->SetFieldObject<false>(CallsiteTypeOffset(), caller_type.Get()); |
| sf->SetFieldObject<false>(TypeOffset(), callee_type.Get()); |
| sf->SetFieldObject<false>(ReferencesOffset(), references.Get()); |
| sf->SetFieldObject<false>(StackFrameOffset(), stack_frame.Get()); |
| |
| return sf.Get(); |
| } |
| |
| bool EmulatedStackFrame::WriteToShadowFrame(Thread* self, |
| Handle<mirror::MethodType> callee_type, |
| const uint32_t first_dest_reg, |
| ShadowFrame* callee_frame) { |
| ObjPtr<mirror::ObjectArray<mirror::Class>> from_types(GetType()->GetPTypes()); |
| ObjPtr<mirror::ObjectArray<mirror::Class>> to_types(callee_type->GetPTypes()); |
| |
| const int32_t num_method_params = from_types->GetLength(); |
| if (to_types->GetLength() != num_method_params) { |
| ThrowWrongMethodTypeException(callee_type.Get(), GetType()); |
| return false; |
| } |
| |
| StackHandleScope<3> hs(self); |
| Handle<mirror::MethodType> frame_callsite_type(hs.NewHandle(GetType())); |
| Handle<mirror::ObjectArray<mirror::Object>> references(hs.NewHandle(GetReferences())); |
| Handle<ByteArray> stack_frame(hs.NewHandle(GetStackFrame())); |
| |
| EmulatedStackFrameAccessor getter(references, stack_frame, stack_frame->GetLength()); |
| ShadowFrameSetter setter(callee_frame, first_dest_reg); |
| |
| return PerformConversions<EmulatedStackFrameAccessor, ShadowFrameSetter>( |
| self, frame_callsite_type, callee_type, &getter, &setter, num_method_params); |
| } |
| |
| void EmulatedStackFrame::GetReturnValue(Thread* self, JValue* value) { |
| StackHandleScope<2> hs(self); |
| Handle<mirror::Class> r_type(hs.NewHandle(GetType()->GetRType())); |
| |
| const Primitive::Type type = r_type->GetPrimitiveType(); |
| if (type == Primitive::kPrimNot) { |
| Handle<mirror::ObjectArray<mirror::Object>> references(hs.NewHandle(GetReferences())); |
| value->SetL(references->GetWithoutChecks(references->GetLength() - 1)); |
| } else { |
| Handle<ByteArray> stack_frame(hs.NewHandle(GetStackFrame())); |
| const int8_t* array = stack_frame->GetData(); |
| const size_t length = stack_frame->GetLength(); |
| if (Primitive::Is64BitType(type)) { |
| int64_t primitive = 0; |
| memcpy(&primitive, array + length - sizeof(int64_t), sizeof(int64_t)); |
| value->SetJ(primitive); |
| } else { |
| uint32_t primitive = 0; |
| memcpy(&primitive, array + length - sizeof(uint32_t), sizeof(uint32_t)); |
| value->SetI(primitive); |
| } |
| } |
| } |
| |
| void EmulatedStackFrame::SetReturnValue(Thread* self, const JValue& value) { |
| StackHandleScope<2> hs(self); |
| Handle<mirror::Class> r_type(hs.NewHandle(GetType()->GetRType())); |
| |
| const Primitive::Type type = r_type->GetPrimitiveType(); |
| if (type == Primitive::kPrimNot) { |
| Handle<mirror::ObjectArray<mirror::Object>> references(hs.NewHandle(GetReferences())); |
| references->SetWithoutChecks<false>(references->GetLength() - 1, value.GetL()); |
| } else { |
| Handle<ByteArray> stack_frame(hs.NewHandle(GetStackFrame())); |
| int8_t* array = stack_frame->GetData(); |
| const size_t length = stack_frame->GetLength(); |
| if (Primitive::Is64BitType(type)) { |
| const int64_t primitive = value.GetJ(); |
| memcpy(array + length - sizeof(int64_t), &primitive, sizeof(int64_t)); |
| } else { |
| const uint32_t primitive = value.GetI(); |
| memcpy(array + length - sizeof(uint32_t), &primitive, sizeof(uint32_t)); |
| } |
| } |
| } |
| |
| void EmulatedStackFrame::SetClass(Class* klass) { |
| CHECK(static_class_.IsNull()) << static_class_.Read() << " " << klass; |
| CHECK(klass != nullptr); |
| static_class_ = GcRoot<Class>(klass); |
| } |
| |
| void EmulatedStackFrame::ResetClass() { |
| CHECK(!static_class_.IsNull()); |
| static_class_ = GcRoot<Class>(nullptr); |
| } |
| |
| void EmulatedStackFrame::VisitRoots(RootVisitor* visitor) { |
| static_class_.VisitRootIfNonNull(visitor, RootInfo(kRootStickyClass)); |
| } |
| |
| } // namespace mirror |
| } // namespace art |