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      1 /*
      2  * Copyright (C) 2015 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 "simulator/code_simulator_arm64.h"
     18 
     19 #include "base/logging.h"
     20 
     21 using namespace vixl::aarch64;  // NOLINT(build/namespaces)
     22 
     23 namespace art {
     24 namespace arm64 {
     25 
     26 // VIXL has not been tested on 32bit architectures, so Simulator is not always
     27 // available. To avoid linker error on these architectures, we check if we can simulate
     28 // in the beginning of following methods, with compile time constant `kCanSimulate`.
     29 // TODO: when Simulator is always available, remove the these checks.
     30 
     31 CodeSimulatorArm64* CodeSimulatorArm64::CreateCodeSimulatorArm64() {
     32   if (kCanSimulate) {
     33     return new CodeSimulatorArm64();
     34   } else {
     35     return nullptr;
     36   }
     37 }
     38 
     39 CodeSimulatorArm64::CodeSimulatorArm64()
     40     : CodeSimulator(), decoder_(nullptr), simulator_(nullptr) {
     41   DCHECK(kCanSimulate);
     42   decoder_ = new Decoder();
     43   simulator_ = new Simulator(decoder_);
     44 }
     45 
     46 CodeSimulatorArm64::~CodeSimulatorArm64() {
     47   DCHECK(kCanSimulate);
     48   delete simulator_;
     49   delete decoder_;
     50 }
     51 
     52 void CodeSimulatorArm64::RunFrom(intptr_t code_buffer) {
     53   DCHECK(kCanSimulate);
     54   simulator_->RunFrom(reinterpret_cast<const Instruction*>(code_buffer));
     55 }
     56 
     57 bool CodeSimulatorArm64::GetCReturnBool() const {
     58   DCHECK(kCanSimulate);
     59   return simulator_->ReadWRegister(0);
     60 }
     61 
     62 int32_t CodeSimulatorArm64::GetCReturnInt32() const {
     63   DCHECK(kCanSimulate);
     64   return simulator_->ReadWRegister(0);
     65 }
     66 
     67 int64_t CodeSimulatorArm64::GetCReturnInt64() const {
     68   DCHECK(kCanSimulate);
     69   return simulator_->ReadXRegister(0);
     70 }
     71 
     72 }  // namespace arm64
     73 }  // namespace art
     74