optimizing_compiler.cc revision 622d9c31febd950255b36a48b47e1f630197c5fe 
1/*
2 * Copyright (C) 2014 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 <stdint.h>
18
19#include "builder.h"
20#include "code_generator.h"
21#include "compilers.h"
22#include "driver/compiler_driver.h"
23#include "driver/dex_compilation_unit.h"
24#include "nodes.h"
25#include "ssa_liveness_analysis.h"
26#include "utils/arena_allocator.h"
27
28namespace art {
29
30/**
31 * Used by the code generator, to allocate the code in a vector.
32 */
33class CodeVectorAllocator FINAL : public CodeAllocator {
34 public:
35  CodeVectorAllocator() { }
36
37  virtual uint8_t* Allocate(size_t size) {
38    size_ = size;
39    memory_.resize(size);
40    return &memory_[0];
41  }
42
43  size_t GetSize() const { return size_; }
44  const std::vector<uint8_t>& GetMemory() const { return memory_; }
45
46 private:
47  std::vector<uint8_t> memory_;
48  size_t size_;
49
50  DISALLOW_COPY_AND_ASSIGN(CodeVectorAllocator);
51};
52
53
54CompiledMethod* OptimizingCompiler::TryCompile(const DexFile::CodeItem* code_item,
55                                               uint32_t access_flags,
56                                               InvokeType invoke_type,
57                                               uint16_t class_def_idx,
58                                               uint32_t method_idx,
59                                               jobject class_loader,
60                                               const DexFile& dex_file) const {
61  DexCompilationUnit dex_compilation_unit(
62    nullptr, class_loader, art::Runtime::Current()->GetClassLinker(), dex_file, code_item,
63    class_def_idx, method_idx, access_flags,
64    GetCompilerDriver()->GetVerifiedMethod(&dex_file, method_idx));
65
66  // For testing purposes, we put a special marker on method names that should be compiled
67  // with this compiler. This makes sure we're not regressing.
68  bool shouldCompile = dex_compilation_unit.GetSymbol().find("00024opt_00024") != std::string::npos;
69
70  ArenaPool pool;
71  ArenaAllocator arena(&pool);
72  HGraphBuilder builder(&arena, &dex_compilation_unit, &dex_file);
73  HGraph* graph = builder.BuildGraph(*code_item);
74  if (graph == nullptr) {
75    if (shouldCompile) {
76      LOG(FATAL) << "Could not build graph in optimizing compiler";
77    }
78    return nullptr;
79  }
80
81  InstructionSet instruction_set = GetCompilerDriver()->GetInstructionSet();
82  // The optimizing compiler currently does not have a Thumb2 assembler.
83  if (instruction_set == kThumb2) {
84    instruction_set = kArm;
85  }
86  CodeGenerator* codegen = CodeGenerator::Create(&arena, graph, instruction_set);
87  if (codegen == nullptr) {
88    if (shouldCompile) {
89      LOG(FATAL) << "Could not find code generator for optimizing compiler";
90    }
91    return nullptr;
92  }
93
94  CodeVectorAllocator allocator;
95  codegen->Compile(&allocator);
96
97  std::vector<uint8_t> mapping_table;
98  codegen->BuildMappingTable(&mapping_table);
99  std::vector<uint8_t> vmap_table;
100  codegen->BuildVMapTable(&vmap_table);
101  std::vector<uint8_t> gc_map;
102  codegen->BuildNativeGCMap(&gc_map, dex_compilation_unit);
103
104  // Run these phases to get some test coverage.
105  graph->BuildDominatorTree();
106  graph->TransformToSSA();
107  graph->FindNaturalLoops();
108  SsaLivenessAnalysis(*graph).Analyze();
109
110  return new CompiledMethod(GetCompilerDriver(),
111                            instruction_set,
112                            allocator.GetMemory(),
113                            codegen->GetFrameSize(),
114                            codegen->GetCoreSpillMask(),
115                            0, /* FPR spill mask, unused */
116                            mapping_table,
117                            vmap_table,
118                            gc_map,
119                            nullptr);
120}
121
122}  // namespace art
123