optimizing_compiler.cc revision a5ae3c3f468ffe3a317b498d7fde1f8e9325346a 
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 "optimizing_compiler.h"
18
19#include <fstream>
20#include <stdint.h>
21
22#include "art_method-inl.h"
23#include "base/arena_allocator.h"
24#include "base/dumpable.h"
25#include "base/timing_logger.h"
26#include "boolean_simplifier.h"
27#include "bounds_check_elimination.h"
28#include "builder.h"
29#include "code_generator.h"
30#include "compiled_method.h"
31#include "compiler.h"
32#include "constant_folding.h"
33#include "dead_code_elimination.h"
34#include "dex/quick/dex_file_to_method_inliner_map.h"
35#include "dex/verified_method.h"
36#include "dex/verification_results.h"
37#include "driver/compiler_driver.h"
38#include "driver/compiler_driver-inl.h"
39#include "driver/compiler_options.h"
40#include "driver/dex_compilation_unit.h"
41#include "elf_writer_quick.h"
42#include "graph_checker.h"
43#include "graph_visualizer.h"
44#include "gvn.h"
45#include "inliner.h"
46#include "instruction_simplifier.h"
47#include "intrinsics.h"
48#include "licm.h"
49#include "jni/quick/jni_compiler.h"
50#include "nodes.h"
51#include "prepare_for_register_allocation.h"
52#include "reference_type_propagation.h"
53#include "register_allocator.h"
54#include "side_effects_analysis.h"
55#include "ssa_builder.h"
56#include "ssa_phi_elimination.h"
57#include "ssa_liveness_analysis.h"
58#include "utils/assembler.h"
59
60namespace art {
61
62/**
63 * Used by the code generator, to allocate the code in a vector.
64 */
65class CodeVectorAllocator FINAL : public CodeAllocator {
66 public:
67  CodeVectorAllocator() : size_(0) {}
68
69  virtual uint8_t* Allocate(size_t size) {
70    size_ = size;
71    memory_.resize(size);
72    return &memory_[0];
73  }
74
75  size_t GetSize() const { return size_; }
76  const std::vector<uint8_t>& GetMemory() const { return memory_; }
77
78 private:
79  std::vector<uint8_t> memory_;
80  size_t size_;
81
82  DISALLOW_COPY_AND_ASSIGN(CodeVectorAllocator);
83};
84
85/**
86 * Filter to apply to the visualizer. Methods whose name contain that filter will
87 * be dumped.
88 */
89static constexpr const char kStringFilter[] = "";
90
91class PassScope;
92
93class PassObserver : public ValueObject {
94 public:
95  PassObserver(HGraph* graph,
96               const char* method_name,
97               CodeGenerator* codegen,
98               std::ostream* visualizer_output,
99               CompilerDriver* compiler_driver)
100      : graph_(graph),
101        method_name_(method_name),
102        timing_logger_enabled_(compiler_driver->GetDumpPasses()),
103        timing_logger_(method_name, true, true),
104        disasm_info_(graph->GetArena()),
105        visualizer_enabled_(!compiler_driver->GetDumpCfgFileName().empty()),
106        visualizer_(visualizer_output, graph, *codegen),
107        graph_in_bad_state_(false) {
108    if (timing_logger_enabled_ || visualizer_enabled_) {
109      if (!IsVerboseMethod(compiler_driver, method_name)) {
110        timing_logger_enabled_ = visualizer_enabled_ = false;
111      }
112      if (visualizer_enabled_) {
113        visualizer_.PrintHeader(method_name_);
114        codegen->SetDisassemblyInformation(&disasm_info_);
115      }
116    }
117  }
118
119  ~PassObserver() {
120    if (timing_logger_enabled_) {
121      LOG(INFO) << "TIMINGS " << method_name_;
122      LOG(INFO) << Dumpable<TimingLogger>(timing_logger_);
123    }
124  }
125
126  void DumpDisassembly() const {
127    if (visualizer_enabled_) {
128      visualizer_.DumpGraphWithDisassembly();
129    }
130  }
131
132  void SetGraphInBadState() { graph_in_bad_state_ = true; }
133
134 private:
135  void StartPass(const char* pass_name) {
136    // Dump graph first, then start timer.
137    if (visualizer_enabled_) {
138      visualizer_.DumpGraph(pass_name, /* is_after_pass */ false, graph_in_bad_state_);
139    }
140    if (timing_logger_enabled_) {
141      timing_logger_.StartTiming(pass_name);
142    }
143  }
144
145  void EndPass(const char* pass_name) {
146    // Pause timer first, then dump graph.
147    if (timing_logger_enabled_) {
148      timing_logger_.EndTiming();
149    }
150    if (visualizer_enabled_) {
151      visualizer_.DumpGraph(pass_name, /* is_after_pass */ true, graph_in_bad_state_);
152    }
153
154    // Validate the HGraph if running in debug mode.
155    if (kIsDebugBuild) {
156      if (!graph_in_bad_state_) {
157        if (graph_->IsInSsaForm()) {
158          SSAChecker checker(graph_->GetArena(), graph_);
159          checker.Run();
160          if (!checker.IsValid()) {
161            LOG(FATAL) << "Error after " << pass_name << ": " << Dumpable<SSAChecker>(checker);
162          }
163        } else {
164          GraphChecker checker(graph_->GetArena(), graph_);
165          checker.Run();
166          if (!checker.IsValid()) {
167            LOG(FATAL) << "Error after " << pass_name << ": " << Dumpable<GraphChecker>(checker);
168          }
169        }
170      }
171    }
172  }
173
174  static bool IsVerboseMethod(CompilerDriver* compiler_driver, const char* method_name) {
175    // Test an exact match to --verbose-methods. If verbose-methods is set, this overrides an
176    // empty kStringFilter matching all methods.
177    if (compiler_driver->GetCompilerOptions().HasVerboseMethods()) {
178      return compiler_driver->GetCompilerOptions().IsVerboseMethod(method_name);
179    }
180
181    // Test the kStringFilter sub-string. constexpr helper variable to silence unreachable-code
182    // warning when the string is empty.
183    constexpr bool kStringFilterEmpty = arraysize(kStringFilter) <= 1;
184    if (kStringFilterEmpty || strstr(method_name, kStringFilter) != nullptr) {
185      return true;
186    }
187
188    return false;
189  }
190
191  HGraph* const graph_;
192  const char* method_name_;
193
194  bool timing_logger_enabled_;
195  TimingLogger timing_logger_;
196
197  DisassemblyInformation disasm_info_;
198
199  bool visualizer_enabled_;
200  HGraphVisualizer visualizer_;
201
202  // Flag to be set by the compiler if the pass failed and the graph is not
203  // expected to validate.
204  bool graph_in_bad_state_;
205
206  friend PassScope;
207
208  DISALLOW_COPY_AND_ASSIGN(PassObserver);
209};
210
211class PassScope : public ValueObject {
212 public:
213  PassScope(const char *pass_name, PassObserver* pass_observer)
214      : pass_name_(pass_name),
215        pass_observer_(pass_observer) {
216    pass_observer_->StartPass(pass_name_);
217  }
218
219  ~PassScope() {
220    pass_observer_->EndPass(pass_name_);
221  }
222
223 private:
224  const char* const pass_name_;
225  PassObserver* const pass_observer_;
226};
227
228class OptimizingCompiler FINAL : public Compiler {
229 public:
230  explicit OptimizingCompiler(CompilerDriver* driver);
231  ~OptimizingCompiler();
232
233  bool CanCompileMethod(uint32_t method_idx, const DexFile& dex_file, CompilationUnit* cu) const
234      OVERRIDE;
235
236  CompiledMethod* Compile(const DexFile::CodeItem* code_item,
237                          uint32_t access_flags,
238                          InvokeType invoke_type,
239                          uint16_t class_def_idx,
240                          uint32_t method_idx,
241                          jobject class_loader,
242                          const DexFile& dex_file) const OVERRIDE;
243
244  CompiledMethod* TryCompile(const DexFile::CodeItem* code_item,
245                             uint32_t access_flags,
246                             InvokeType invoke_type,
247                             uint16_t class_def_idx,
248                             uint32_t method_idx,
249                             jobject class_loader,
250                             const DexFile& dex_file) const;
251
252  CompiledMethod* JniCompile(uint32_t access_flags,
253                             uint32_t method_idx,
254                             const DexFile& dex_file) const OVERRIDE {
255    return ArtQuickJniCompileMethod(GetCompilerDriver(), access_flags, method_idx, dex_file);
256  }
257
258  uintptr_t GetEntryPointOf(ArtMethod* method) const OVERRIDE
259      SHARED_REQUIRES(Locks::mutator_lock_) {
260    return reinterpret_cast<uintptr_t>(method->GetEntryPointFromQuickCompiledCodePtrSize(
261        InstructionSetPointerSize(GetCompilerDriver()->GetInstructionSet())));
262  }
263
264  void InitCompilationUnit(CompilationUnit& cu) const OVERRIDE;
265
266  void Init() OVERRIDE;
267
268  void UnInit() const OVERRIDE;
269
270  void MaybeRecordStat(MethodCompilationStat compilation_stat) const {
271    if (compilation_stats_.get() != nullptr) {
272      compilation_stats_->RecordStat(compilation_stat);
273    }
274  }
275
276 private:
277  // Whether we should run any optimization or register allocation. If false, will
278  // just run the code generation after the graph was built.
279  const bool run_optimizations_;
280
281  // Optimize and compile `graph`.
282  CompiledMethod* CompileOptimized(HGraph* graph,
283                                   CodeGenerator* codegen,
284                                   CompilerDriver* driver,
285                                   const DexCompilationUnit& dex_compilation_unit,
286                                   PassObserver* pass_observer) const;
287
288  // Just compile without doing optimizations.
289  CompiledMethod* CompileBaseline(CodeGenerator* codegen,
290                                  CompilerDriver* driver,
291                                  const DexCompilationUnit& dex_compilation_unit,
292                                  PassObserver* pass_observer) const;
293
294  std::unique_ptr<OptimizingCompilerStats> compilation_stats_;
295
296  std::unique_ptr<std::ostream> visualizer_output_;
297
298  // Delegate to Quick in case the optimizing compiler cannot compile a method.
299  std::unique_ptr<Compiler> delegate_;
300
301  DISALLOW_COPY_AND_ASSIGN(OptimizingCompiler);
302};
303
304static const int kMaximumCompilationTimeBeforeWarning = 100; /* ms */
305
306OptimizingCompiler::OptimizingCompiler(CompilerDriver* driver)
307    : Compiler(driver, kMaximumCompilationTimeBeforeWarning),
308      run_optimizations_(
309          (driver->GetCompilerOptions().GetCompilerFilter() != CompilerOptions::kTime)
310          && !driver->GetCompilerOptions().GetDebuggable()),
311      delegate_(Create(driver, Compiler::Kind::kQuick)) {}
312
313void OptimizingCompiler::Init() {
314  delegate_->Init();
315  // Enable C1visualizer output. Must be done in Init() because the compiler
316  // driver is not fully initialized when passed to the compiler's constructor.
317  CompilerDriver* driver = GetCompilerDriver();
318  const std::string cfg_file_name = driver->GetDumpCfgFileName();
319  if (!cfg_file_name.empty()) {
320    CHECK_EQ(driver->GetThreadCount(), 1U)
321      << "Graph visualizer requires the compiler to run single-threaded. "
322      << "Invoke the compiler with '-j1'.";
323    visualizer_output_.reset(new std::ofstream(cfg_file_name));
324  }
325  if (driver->GetDumpStats()) {
326    compilation_stats_.reset(new OptimizingCompilerStats());
327  }
328}
329
330void OptimizingCompiler::UnInit() const {
331  delegate_->UnInit();
332}
333
334OptimizingCompiler::~OptimizingCompiler() {
335  if (compilation_stats_.get() != nullptr) {
336    compilation_stats_->Log();
337  }
338}
339
340void OptimizingCompiler::InitCompilationUnit(CompilationUnit& cu) const {
341  delegate_->InitCompilationUnit(cu);
342}
343
344bool OptimizingCompiler::CanCompileMethod(uint32_t method_idx ATTRIBUTE_UNUSED,
345                                          const DexFile& dex_file ATTRIBUTE_UNUSED,
346                                          CompilationUnit* cu ATTRIBUTE_UNUSED) const {
347  return true;
348}
349
350static bool IsInstructionSetSupported(InstructionSet instruction_set) {
351  return instruction_set == kArm64
352      || (instruction_set == kThumb2 && !kArm32QuickCodeUseSoftFloat)
353      || instruction_set == kMips64
354      || instruction_set == kX86
355      || instruction_set == kX86_64;
356}
357
358static bool CanOptimize(const DexFile::CodeItem& code_item) {
359  // TODO: We currently cannot optimize methods with try/catch.
360  return code_item.tries_size_ == 0;
361}
362
363static void RunOptimizations(HOptimization* optimizations[],
364                             size_t length,
365                             PassObserver* pass_observer) {
366  for (size_t i = 0; i < length; ++i) {
367    PassScope scope(optimizations[i]->GetPassName(), pass_observer);
368    optimizations[i]->Run();
369  }
370}
371
372static void RunOptimizations(HGraph* graph,
373                             CompilerDriver* driver,
374                             OptimizingCompilerStats* stats,
375                             const DexCompilationUnit& dex_compilation_unit,
376                             PassObserver* pass_observer,
377                             StackHandleScopeCollection* handles) {
378  ArenaAllocator* arena = graph->GetArena();
379  HDeadCodeElimination* dce1 = new (arena) HDeadCodeElimination(
380      graph, stats, HDeadCodeElimination::kInitialDeadCodeEliminationPassName);
381  HDeadCodeElimination* dce2 = new (arena) HDeadCodeElimination(
382      graph, stats, HDeadCodeElimination::kFinalDeadCodeEliminationPassName);
383  HConstantFolding* fold1 = new (arena) HConstantFolding(graph);
384  InstructionSimplifier* simplify1 = new (arena) InstructionSimplifier(graph, stats);
385  HBooleanSimplifier* boolean_simplify = new (arena) HBooleanSimplifier(graph);
386
387  HInliner* inliner = new (arena) HInliner(
388      graph, dex_compilation_unit, dex_compilation_unit, driver, handles, stats);
389
390  HConstantFolding* fold2 = new (arena) HConstantFolding(graph, "constant_folding_after_inlining");
391  SideEffectsAnalysis* side_effects = new (arena) SideEffectsAnalysis(graph);
392  GVNOptimization* gvn = new (arena) GVNOptimization(graph, *side_effects);
393  LICM* licm = new (arena) LICM(graph, *side_effects);
394  BoundsCheckElimination* bce = new (arena) BoundsCheckElimination(graph);
395  ReferenceTypePropagation* type_propagation =
396      new (arena) ReferenceTypePropagation(graph, handles);
397  InstructionSimplifier* simplify2 = new (arena) InstructionSimplifier(
398      graph, stats, "instruction_simplifier_after_types");
399  InstructionSimplifier* simplify3 = new (arena) InstructionSimplifier(
400      graph, stats, "instruction_simplifier_after_bce");
401  ReferenceTypePropagation* type_propagation2 =
402      new (arena) ReferenceTypePropagation(
403          graph, handles, "reference_type_propagation_after_inlining");
404  InstructionSimplifier* simplify4 = new (arena) InstructionSimplifier(
405      graph, stats, "instruction_simplifier_before_codegen");
406
407  IntrinsicsRecognizer* intrinsics = new (arena) IntrinsicsRecognizer(graph, driver);
408
409  HOptimization* optimizations[] = {
410    intrinsics,
411    fold1,
412    simplify1,
413    type_propagation,
414    dce1,
415    simplify2,
416    inliner,
417    // Run another type propagation phase: inlining will open up more opprotunities
418    // to remove checkast/instanceof and null checks.
419    type_propagation2,
420    // BooleanSimplifier depends on the InstructionSimplifier removing redundant
421    // suspend checks to recognize empty blocks.
422    boolean_simplify,
423    fold2,
424    side_effects,
425    gvn,
426    licm,
427    bce,
428    simplify3,
429    dce2,
430    // The codegen has a few assumptions that only the instruction simplifier can
431    // satisfy. For example, the code generator does not expect to see a
432    // HTypeConversion from a type to the same type.
433    simplify4,
434  };
435
436  RunOptimizations(optimizations, arraysize(optimizations), pass_observer);
437}
438
439// The stack map we generate must be 4-byte aligned on ARM. Since existing
440// maps are generated alongside these stack maps, we must also align them.
441static ArrayRef<const uint8_t> AlignVectorSize(std::vector<uint8_t>& vector) {
442  size_t size = vector.size();
443  size_t aligned_size = RoundUp(size, 4);
444  for (; size < aligned_size; ++size) {
445    vector.push_back(0);
446  }
447  return ArrayRef<const uint8_t>(vector);
448}
449
450static void AllocateRegisters(HGraph* graph,
451                              CodeGenerator* codegen,
452                              PassObserver* pass_observer) {
453  PrepareForRegisterAllocation(graph).Run();
454  SsaLivenessAnalysis liveness(graph, codegen);
455  {
456    PassScope scope(SsaLivenessAnalysis::kLivenessPassName, pass_observer);
457    liveness.Analyze();
458  }
459  {
460    PassScope scope(RegisterAllocator::kRegisterAllocatorPassName, pass_observer);
461    RegisterAllocator(graph->GetArena(), codegen, liveness).AllocateRegisters();
462  }
463}
464
465CompiledMethod* OptimizingCompiler::CompileOptimized(HGraph* graph,
466                                                     CodeGenerator* codegen,
467                                                     CompilerDriver* compiler_driver,
468                                                     const DexCompilationUnit& dex_compilation_unit,
469                                                     PassObserver* pass_observer) const {
470  StackHandleScopeCollection handles(Thread::Current());
471  RunOptimizations(graph, compiler_driver, compilation_stats_.get(),
472                   dex_compilation_unit, pass_observer, &handles);
473
474  AllocateRegisters(graph, codegen, pass_observer);
475
476  CodeVectorAllocator allocator;
477  codegen->CompileOptimized(&allocator);
478
479  DefaultSrcMap src_mapping_table;
480  if (compiler_driver->GetCompilerOptions().GetGenerateDebugInfo()) {
481    codegen->BuildSourceMap(&src_mapping_table);
482  }
483
484  std::vector<uint8_t> stack_map;
485  codegen->BuildStackMaps(&stack_map);
486
487  MaybeRecordStat(MethodCompilationStat::kCompiledOptimized);
488
489  CompiledMethod* compiled_method = CompiledMethod::SwapAllocCompiledMethod(
490      compiler_driver,
491      codegen->GetInstructionSet(),
492      ArrayRef<const uint8_t>(allocator.GetMemory()),
493      // Follow Quick's behavior and set the frame size to zero if it is
494      // considered "empty" (see the definition of
495      // art::CodeGenerator::HasEmptyFrame).
496      codegen->HasEmptyFrame() ? 0 : codegen->GetFrameSize(),
497      codegen->GetCoreSpillMask(),
498      codegen->GetFpuSpillMask(),
499      &src_mapping_table,
500      ArrayRef<const uint8_t>(),  // mapping_table.
501      ArrayRef<const uint8_t>(stack_map),
502      ArrayRef<const uint8_t>(),  // native_gc_map.
503      ArrayRef<const uint8_t>(*codegen->GetAssembler()->cfi().data()),
504      ArrayRef<const LinkerPatch>());
505  pass_observer->DumpDisassembly();
506  return compiled_method;
507}
508
509CompiledMethod* OptimizingCompiler::CompileBaseline(
510    CodeGenerator* codegen,
511    CompilerDriver* compiler_driver,
512    const DexCompilationUnit& dex_compilation_unit,
513    PassObserver* pass_observer) const {
514  CodeVectorAllocator allocator;
515  codegen->CompileBaseline(&allocator);
516
517  std::vector<uint8_t> mapping_table;
518  codegen->BuildMappingTable(&mapping_table);
519  DefaultSrcMap src_mapping_table;
520  if (compiler_driver->GetCompilerOptions().GetGenerateDebugInfo()) {
521    codegen->BuildSourceMap(&src_mapping_table);
522  }
523  std::vector<uint8_t> vmap_table;
524  codegen->BuildVMapTable(&vmap_table);
525  std::vector<uint8_t> gc_map;
526  codegen->BuildNativeGCMap(&gc_map, dex_compilation_unit);
527
528  MaybeRecordStat(MethodCompilationStat::kCompiledBaseline);
529  CompiledMethod* compiled_method = CompiledMethod::SwapAllocCompiledMethod(
530      compiler_driver,
531      codegen->GetInstructionSet(),
532      ArrayRef<const uint8_t>(allocator.GetMemory()),
533      // Follow Quick's behavior and set the frame size to zero if it is
534      // considered "empty" (see the definition of
535      // art::CodeGenerator::HasEmptyFrame).
536      codegen->HasEmptyFrame() ? 0 : codegen->GetFrameSize(),
537      codegen->GetCoreSpillMask(),
538      codegen->GetFpuSpillMask(),
539      &src_mapping_table,
540      AlignVectorSize(mapping_table),
541      AlignVectorSize(vmap_table),
542      AlignVectorSize(gc_map),
543      ArrayRef<const uint8_t>(*codegen->GetAssembler()->cfi().data()),
544      ArrayRef<const LinkerPatch>());
545  pass_observer->DumpDisassembly();
546  return compiled_method;
547}
548
549CompiledMethod* OptimizingCompiler::TryCompile(const DexFile::CodeItem* code_item,
550                                               uint32_t access_flags,
551                                               InvokeType invoke_type,
552                                               uint16_t class_def_idx,
553                                               uint32_t method_idx,
554                                               jobject class_loader,
555                                               const DexFile& dex_file) const {
556  UNUSED(invoke_type);
557  std::string method_name = PrettyMethod(method_idx, dex_file);
558  MaybeRecordStat(MethodCompilationStat::kAttemptCompilation);
559  CompilerDriver* compiler_driver = GetCompilerDriver();
560  InstructionSet instruction_set = compiler_driver->GetInstructionSet();
561  // Always use the thumb2 assembler: some runtime functionality (like implicit stack
562  // overflow checks) assume thumb2.
563  if (instruction_set == kArm) {
564    instruction_set = kThumb2;
565  }
566
567  // Do not attempt to compile on architectures we do not support.
568  if (!IsInstructionSetSupported(instruction_set)) {
569    MaybeRecordStat(MethodCompilationStat::kNotCompiledUnsupportedIsa);
570    return nullptr;
571  }
572
573  if (Compiler::IsPathologicalCase(*code_item, method_idx, dex_file)) {
574    MaybeRecordStat(MethodCompilationStat::kNotCompiledPathological);
575    return nullptr;
576  }
577
578  // Implementation of the space filter: do not compile a code item whose size in
579  // code units is bigger than 128.
580  static constexpr size_t kSpaceFilterOptimizingThreshold = 128;
581  const CompilerOptions& compiler_options = compiler_driver->GetCompilerOptions();
582  if ((compiler_options.GetCompilerFilter() == CompilerOptions::kSpace)
583      && (code_item->insns_size_in_code_units_ > kSpaceFilterOptimizingThreshold)) {
584    MaybeRecordStat(MethodCompilationStat::kNotCompiledSpaceFilter);
585    return nullptr;
586  }
587
588  DexCompilationUnit dex_compilation_unit(
589    nullptr, class_loader, Runtime::Current()->GetClassLinker(), dex_file, code_item,
590    class_def_idx, method_idx, access_flags,
591    compiler_driver->GetVerifiedMethod(&dex_file, method_idx));
592
593  bool requires_barrier = dex_compilation_unit.IsConstructor()
594      && compiler_driver->RequiresConstructorBarrier(Thread::Current(),
595                                                     dex_compilation_unit.GetDexFile(),
596                                                     dex_compilation_unit.GetClassDefIndex());
597  ArenaAllocator arena(Runtime::Current()->GetArenaPool());
598  HGraph* graph = new (&arena) HGraph(
599      &arena, dex_file, method_idx, requires_barrier, compiler_driver->GetInstructionSet(),
600      kInvalidInvokeType, compiler_driver->GetCompilerOptions().GetDebuggable());
601
602  // For testing purposes, we put a special marker on method names that should be compiled
603  // with this compiler. This makes sure we're not regressing.
604  bool shouldCompile = method_name.find("$opt$") != std::string::npos;
605  bool shouldOptimize = method_name.find("$opt$reg$") != std::string::npos && run_optimizations_;
606
607  std::unique_ptr<CodeGenerator> codegen(
608      CodeGenerator::Create(graph,
609                            instruction_set,
610                            *compiler_driver->GetInstructionSetFeatures(),
611                            compiler_driver->GetCompilerOptions()));
612  if (codegen.get() == nullptr) {
613    CHECK(!shouldCompile) << "Could not find code generator for optimizing compiler";
614    MaybeRecordStat(MethodCompilationStat::kNotCompiledNoCodegen);
615    return nullptr;
616  }
617  codegen->GetAssembler()->cfi().SetEnabled(
618      compiler_driver->GetCompilerOptions().GetGenerateDebugInfo());
619
620  PassObserver pass_observer(graph,
621                             method_name.c_str(),
622                             codegen.get(),
623                             visualizer_output_.get(),
624                             compiler_driver);
625
626  const uint8_t* interpreter_metadata = nullptr;
627  {
628    ScopedObjectAccess soa(Thread::Current());
629    StackHandleScope<4> hs(soa.Self());
630    ClassLinker* class_linker = dex_compilation_unit.GetClassLinker();
631    Handle<mirror::DexCache> dex_cache(hs.NewHandle(class_linker->FindDexCache(dex_file)));
632    Handle<mirror::ClassLoader> loader(hs.NewHandle(
633        soa.Decode<mirror::ClassLoader*>(class_loader)));
634    ArtMethod* art_method = compiler_driver->ResolveMethod(
635        soa, dex_cache, loader, &dex_compilation_unit, method_idx, invoke_type);
636    // We may not get a method, for example if its class is erroneous.
637    // TODO: Clean this up, the compiler driver should just pass the ArtMethod to compile.
638    if (art_method != nullptr) {
639      interpreter_metadata = art_method->GetQuickenedInfo();
640    }
641  }
642  HGraphBuilder builder(graph,
643                        &dex_compilation_unit,
644                        &dex_compilation_unit,
645                        &dex_file,
646                        compiler_driver,
647                        compilation_stats_.get(),
648                        interpreter_metadata);
649
650  VLOG(compiler) << "Building " << method_name;
651
652  {
653    PassScope scope(HGraphBuilder::kBuilderPassName, &pass_observer);
654    if (!builder.BuildGraph(*code_item)) {
655      DCHECK(!(IsCompilingWithCoreImage() && shouldCompile))
656          << "Could not build graph in optimizing compiler";
657      pass_observer.SetGraphInBadState();
658      return nullptr;
659    }
660  }
661
662  bool can_optimize = CanOptimize(*code_item);
663  bool can_allocate_registers = RegisterAllocator::CanAllocateRegistersFor(*graph, instruction_set);
664
665  // `run_optimizations_` is set explicitly (either through a compiler filter
666  // or the debuggable flag). If it is set, we can run baseline. Otherwise, we fall back
667  // to Quick.
668  bool can_use_baseline = !run_optimizations_ && builder.CanUseBaselineForStringInit();
669  if (run_optimizations_ && can_allocate_registers) {
670    VLOG(compiler) << "Optimizing " << method_name;
671
672    {
673      PassScope scope(SsaBuilder::kSsaBuilderPassName, &pass_observer);
674      if (!graph->TryBuildingSsa()) {
675        // We could not transform the graph to SSA, bailout.
676        LOG(INFO) << "Skipping compilation of " << method_name << ": it contains a non natural loop";
677        MaybeRecordStat(MethodCompilationStat::kNotCompiledCannotBuildSSA);
678        pass_observer.SetGraphInBadState();
679        return nullptr;
680      }
681    }
682
683    if (can_optimize) {
684      return CompileOptimized(graph,
685                              codegen.get(),
686                              compiler_driver,
687                              dex_compilation_unit,
688                              &pass_observer);
689    }
690  }
691
692  if (shouldOptimize && can_allocate_registers) {
693    LOG(FATAL) << "Could not allocate registers in optimizing compiler";
694    UNREACHABLE();
695  } else if (can_use_baseline) {
696    VLOG(compiler) << "Compile baseline " << method_name;
697
698    if (!run_optimizations_) {
699      MaybeRecordStat(MethodCompilationStat::kNotOptimizedDisabled);
700    } else if (!can_optimize) {
701      MaybeRecordStat(MethodCompilationStat::kNotOptimizedTryCatch);
702    } else if (!can_allocate_registers) {
703      MaybeRecordStat(MethodCompilationStat::kNotOptimizedRegisterAllocator);
704    }
705
706    return CompileBaseline(codegen.get(),
707                           compiler_driver,
708                           dex_compilation_unit,
709                           &pass_observer);
710  } else {
711    return nullptr;
712  }
713}
714
715CompiledMethod* OptimizingCompiler::Compile(const DexFile::CodeItem* code_item,
716                                            uint32_t access_flags,
717                                            InvokeType invoke_type,
718                                            uint16_t class_def_idx,
719                                            uint32_t method_idx,
720                                            jobject jclass_loader,
721                                            const DexFile& dex_file) const {
722  CompilerDriver* compiler_driver = GetCompilerDriver();
723  CompiledMethod* method = nullptr;
724  if (compiler_driver->IsMethodVerifiedWithoutFailures(method_idx, class_def_idx, dex_file) &&
725      !compiler_driver->GetVerifiedMethod(&dex_file, method_idx)->HasRuntimeThrow()) {
726     method = TryCompile(code_item, access_flags, invoke_type, class_def_idx,
727                         method_idx, jclass_loader, dex_file);
728  } else {
729    if (compiler_driver->GetCompilerOptions().VerifyAtRuntime()) {
730      MaybeRecordStat(MethodCompilationStat::kNotCompiledVerifyAtRuntime);
731    } else {
732      MaybeRecordStat(MethodCompilationStat::kNotCompiledClassNotVerified);
733    }
734  }
735
736  if (method != nullptr) {
737    return method;
738  }
739  method = delegate_->Compile(code_item, access_flags, invoke_type, class_def_idx, method_idx,
740                              jclass_loader, dex_file);
741
742  if (method != nullptr) {
743    MaybeRecordStat(MethodCompilationStat::kCompiledQuick);
744  }
745  return method;
746}
747
748Compiler* CreateOptimizingCompiler(CompilerDriver* driver) {
749  return new OptimizingCompiler(driver);
750}
751
752bool IsCompilingWithCoreImage() {
753  const std::string& image = Runtime::Current()->GetImageLocation();
754  return EndsWith(image, "core.art") || EndsWith(image, "core-optimizing.art");
755}
756
757}  // namespace art
758