Nicolas Geoffray | 68a5fef | 2014-02-18 16:43:35 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * |
| 3 | * Copyright (C) 2014 The Android Open Source Project |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | #include "dex_instruction.h" |
| 19 | #include "builder.h" |
| 20 | #include "nodes.h" |
| 21 | |
| 22 | namespace art { |
| 23 | |
| 24 | HGraph* HGraphBuilder::BuildGraph(const uint16_t* code_ptr, const uint16_t* code_end) { |
| 25 | graph_ = new (arena_) HGraph(arena_); |
| 26 | |
| 27 | entry_block_ = new (arena_) HBasicBlock(graph_); |
| 28 | graph_->AddBlock(entry_block_); |
| 29 | |
| 30 | exit_block_ = new (arena_) HBasicBlock(graph_); |
| 31 | // The exit block is added at the end of this method to ensure |
| 32 | // its id is the greatest. This is needed for dominator computation. |
| 33 | |
| 34 | entry_block_->AddInstruction(new (arena_) HGoto(entry_block_)); |
| 35 | |
| 36 | current_block_ = new (arena_) HBasicBlock(graph_); |
| 37 | graph_->AddBlock(current_block_); |
| 38 | entry_block_->AddSuccessor(current_block_); |
| 39 | |
| 40 | while (code_ptr < code_end) { |
| 41 | const Instruction& instruction = *Instruction::At(code_ptr); |
| 42 | if (!AnalyzeDexInstruction(instruction)) return nullptr; |
| 43 | code_ptr += instruction.SizeInCodeUnits(); |
| 44 | } |
| 45 | |
| 46 | exit_block_->AddInstruction(new (arena_) HExit(exit_block_)); |
| 47 | graph_->AddBlock(exit_block_); |
| 48 | return graph_; |
| 49 | } |
| 50 | |
| 51 | bool HGraphBuilder::AnalyzeDexInstruction(const Instruction& instruction) { |
| 52 | switch (instruction.Opcode()) { |
| 53 | case Instruction::RETURN_VOID: |
| 54 | current_block_->AddInstruction(new (arena_) HReturnVoid(current_block_)); |
| 55 | current_block_->AddSuccessor(exit_block_); |
| 56 | current_block_ = nullptr; |
| 57 | break; |
| 58 | default: |
| 59 | return false; |
| 60 | } |
| 61 | return true; |
| 62 | } |
| 63 | |
| 64 | } // namespace art |