From 68a5fefa90f03fdf5a238ac85c9439c6b03eae96 Mon Sep 17 00:00:00 2001 From: Nicolas Geoffray Date: Tue, 18 Feb 2014 16:43:35 +0000 Subject: Initial check-in of an optimizing compiler. The classes and the names are very much inspired by V8/Dart. It currently only supports the RETURN_VOID dex instruction, and there is a pretty printer to check if the building of the graph is correct. Change-Id: Id5ef1b317ab997010d4e3888e456c26bef1ab9c0 --- compiler/optimizing/builder.cc | 64 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 compiler/optimizing/builder.cc (limited to 'compiler/optimizing/builder.cc') diff --git a/compiler/optimizing/builder.cc b/compiler/optimizing/builder.cc new file mode 100644 index 0000000000..2c1091c3c9 --- /dev/null +++ b/compiler/optimizing/builder.cc @@ -0,0 +1,64 @@ +/* + * + * 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 -- cgit v1.2.3-59-g8ed1b