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/*
*
* Copyright (C) 2014 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 "dex_instruction.h"
#include "builder.h"
#include "nodes.h"
namespace art {
HGraph* HGraphBuilder::BuildGraph(const uint16_t* code_ptr, const uint16_t* code_end) {
graph_ = new (arena_) HGraph(arena_);
entry_block_ = new (arena_) HBasicBlock(graph_);
graph_->AddBlock(entry_block_);
exit_block_ = new (arena_) HBasicBlock(graph_);
// The exit block is added at the end of this method to ensure
// its id is the greatest. This is needed for dominator computation.
entry_block_->AddInstruction(new (arena_) HGoto(entry_block_));
current_block_ = new (arena_) HBasicBlock(graph_);
graph_->AddBlock(current_block_);
entry_block_->AddSuccessor(current_block_);
while (code_ptr < code_end) {
const Instruction& instruction = *Instruction::At(code_ptr);
if (!AnalyzeDexInstruction(instruction)) return nullptr;
code_ptr += instruction.SizeInCodeUnits();
}
exit_block_->AddInstruction(new (arena_) HExit(exit_block_));
graph_->AddBlock(exit_block_);
return graph_;
}
bool HGraphBuilder::AnalyzeDexInstruction(const Instruction& instruction) {
switch (instruction.Opcode()) {
case Instruction::RETURN_VOID:
current_block_->AddInstruction(new (arena_) HReturnVoid(current_block_));
current_block_->AddSuccessor(exit_block_);
current_block_ = nullptr;
break;
default:
return false;
}
return true;
}
} // namespace art
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