| Orion Hodson | 537a4fe | 2018-05-15 13:57:58 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2018 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "var_handles.h" |
| 18 | |
| 19 | #include "common_throws.h" |
| 20 | #include "dex/dex_instruction.h" |
| 21 | #include "handle.h" |
| 22 | #include "method_handles-inl.h" |
| 23 | #include "mirror/method_type.h" |
| 24 | #include "mirror/var_handle.h" |
| 25 | |
| 26 | namespace art { |
| 27 | |
| 28 | bool VarHandleInvokeAccessor(Thread* self, |
| 29 | ShadowFrame& shadow_frame, |
| 30 | Handle<mirror::VarHandle> var_handle, |
| 31 | Handle<mirror::MethodType> callsite_type, |
| 32 | const mirror::VarHandle::AccessMode access_mode, |
| 33 | const InstructionOperands* const operands, |
| 34 | JValue* result) { |
| 35 | if (var_handle.IsNull()) { |
| 36 | ThrowNullPointerExceptionFromDexPC(); |
| 37 | return false; |
| 38 | } |
| 39 | |
| 40 | if (!var_handle->IsAccessModeSupported(access_mode)) { |
| 41 | ThrowUnsupportedOperationException(); |
| 42 | return false; |
| 43 | } |
| 44 | |
| 45 | if (!var_handle->IsMethodTypeCompatible(access_mode, callsite_type.Get())) { |
| 46 | ThrowWrongMethodTypeException(var_handle->GetMethodTypeForAccessMode(self, access_mode), |
| 47 | callsite_type.Get()); |
| 48 | return false; |
| 49 | } |
| 50 | |
| 51 | StackHandleScope<1> hs(self); |
| 52 | |
| 53 | // TODO(oth): GetMethodTypeForAccessMode() allocates a MethodType() |
| 54 | // which is only required if we need to convert argument and/or |
| 55 | // return types. |
| 56 | Handle<mirror::MethodType> accessor_type(hs.NewHandle( |
| 57 | var_handle->GetMethodTypeForAccessMode(self, access_mode))); |
| 58 | const size_t num_vregs = accessor_type->NumberOfVRegs(); |
| 59 | const int num_params = accessor_type->GetPTypes()->GetLength(); |
| 60 | ShadowFrameAllocaUniquePtr accessor_frame = |
| 61 | CREATE_SHADOW_FRAME(num_vregs, nullptr, shadow_frame.GetMethod(), shadow_frame.GetDexPC()); |
| 62 | |
| 63 | ShadowFrameGetter getter(shadow_frame, operands); |
| 64 | static const uint32_t kFirstDestinationReg = 0; |
| 65 | ShadowFrameSetter setter(accessor_frame.get(), kFirstDestinationReg); |
| 66 | if (!PerformConversions(self, callsite_type, accessor_type, &getter, &setter, num_params)) { |
| 67 | return false; |
| 68 | } |
| 69 | RangeInstructionOperands accessor_operands(kFirstDestinationReg, |
| 70 | kFirstDestinationReg + num_vregs); |
| 71 | if (!var_handle->Access(access_mode, accessor_frame.get(), &accessor_operands, result)) { |
| 72 | return false; |
| 73 | } |
| 74 | return ConvertReturnValue(callsite_type, accessor_type, result); |
| 75 | } |
| 76 | |
| 77 | } // namespace art |