compiler_driver.h revision 9c86a0279aaf953377aa9e2277592e68bf814989 
1/*
2 * Copyright (C) 2011 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#ifndef ART_COMPILER_DRIVER_COMPILER_DRIVER_H_
18#define ART_COMPILER_DRIVER_COMPILER_DRIVER_H_
19
20#include <set>
21#include <string>
22#include <vector>
23
24#include "base/mutex.h"
25#include "base/timing_logger.h"
26#include "class_reference.h"
27#include "compiled_class.h"
28#include "compiled_method.h"
29#include "compiler_backend.h"
30#include "dex_file.h"
31#include "instruction_set.h"
32#include "invoke_type.h"
33#include "method_reference.h"
34#include "os.h"
35#include "runtime.h"
36#include "safe_map.h"
37#include "thread_pool.h"
38#include "utils/arena_allocator.h"
39#include "utils/dedupe_set.h"
40
41namespace art {
42
43namespace verifier {
44class MethodVerifier;
45}  // namespace verifier
46
47class AOTCompilationStats;
48class DexCompilationUnit;
49class DexFileToMethodInlinerMap;
50class InlineIGetIPutData;
51class OatWriter;
52class ParallelCompilationManager;
53class TimingLogger;
54class VerificationResults;
55class VerifiedMethod;
56
57enum EntryPointCallingConvention {
58  // ABI of invocations to a method's interpreter entry point.
59  kInterpreterAbi,
60  // ABI of calls to a method's native code, only used for native methods.
61  kJniAbi,
62  // ABI of calls to a method's portable code entry point.
63  kPortableAbi,
64  // ABI of calls to a method's quick code entry point.
65  kQuickAbi
66};
67
68enum DexToDexCompilationLevel {
69  kDontDexToDexCompile,   // Only meaning wrt image time interpretation.
70  kRequired,              // Dex-to-dex compilation required for correctness.
71  kOptimize               // Perform required transformation and peep-hole optimizations.
72};
73
74// Thread-local storage compiler worker threads
75class CompilerTls {
76  public:
77    CompilerTls() : llvm_info_(NULL) {}
78    ~CompilerTls() {}
79
80    void* GetLLVMInfo() { return llvm_info_; }
81
82    void SetLLVMInfo(void* llvm_info) { llvm_info_ = llvm_info; }
83
84  private:
85    void* llvm_info_;
86};
87
88class CompilerDriver {
89 public:
90  typedef std::set<std::string> DescriptorSet;
91
92  // Create a compiler targeting the requested "instruction_set".
93  // "image" should be true if image specific optimizations should be
94  // enabled.  "image_classes" lets the compiler know what classes it
95  // can assume will be in the image, with NULL implying all available
96  // classes.
97  explicit CompilerDriver(VerificationResults* verification_results,
98                          DexFileToMethodInlinerMap* method_inliner_map,
99                          CompilerBackend::Kind compiler_backend_kind,
100                          InstructionSet instruction_set,
101                          InstructionSetFeatures instruction_set_features,
102                          bool image, DescriptorSet* image_classes,
103                          size_t thread_count, bool dump_stats, bool dump_passes,
104                          CumulativeLogger* timer);
105
106  ~CompilerDriver();
107
108  void CompileAll(jobject class_loader, const std::vector<const DexFile*>& dex_files,
109                  TimingLogger& timings)
110      LOCKS_EXCLUDED(Locks::mutator_lock_);
111
112  // Compile a single Method.
113  void CompileOne(mirror::ArtMethod* method, TimingLogger& timings)
114      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
115
116  VerificationResults* GetVerificationResults() const {
117    return verification_results_;
118  }
119
120  DexFileToMethodInlinerMap* GetMethodInlinerMap() const {
121    return method_inliner_map_;
122  }
123
124  const InstructionSet& GetInstructionSet() const {
125    return instruction_set_;
126  }
127
128  const InstructionSetFeatures& GetInstructionSetFeatures() const {
129    return instruction_set_features_;
130  }
131
132  CompilerBackend* GetCompilerBackend() const {
133    return compiler_backend_.get();
134  }
135
136  // Are we compiling and creating an image file?
137  bool IsImage() const {
138    return image_;
139  }
140
141  DescriptorSet* GetImageClasses() const {
142    return image_classes_.get();
143  }
144
145  CompilerTls* GetTls();
146
147  // Generate the trampolines that are invoked by unresolved direct methods.
148  const std::vector<uint8_t>* CreateInterpreterToInterpreterBridge() const
149      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
150  const std::vector<uint8_t>* CreateInterpreterToCompiledCodeBridge() const
151      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
152  const std::vector<uint8_t>* CreateJniDlsymLookup() const
153      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
154  const std::vector<uint8_t>* CreatePortableImtConflictTrampoline() const
155      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
156  const std::vector<uint8_t>* CreatePortableResolutionTrampoline() const
157      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
158  const std::vector<uint8_t>* CreatePortableToInterpreterBridge() const
159      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
160  const std::vector<uint8_t>* CreateQuickImtConflictTrampoline() const
161      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
162  const std::vector<uint8_t>* CreateQuickResolutionTrampoline() const
163      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
164  const std::vector<uint8_t>* CreateQuickToInterpreterBridge() const
165      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
166
167  CompiledClass* GetCompiledClass(ClassReference ref) const
168      LOCKS_EXCLUDED(compiled_classes_lock_);
169
170  CompiledMethod* GetCompiledMethod(MethodReference ref) const
171      LOCKS_EXCLUDED(compiled_methods_lock_);
172
173  void AddRequiresConstructorBarrier(Thread* self, const DexFile* dex_file,
174                                     uint16_t class_def_index);
175  bool RequiresConstructorBarrier(Thread* self, const DexFile* dex_file, uint16_t class_def_index);
176
177  // Callbacks from compiler to see what runtime checks must be generated.
178
179  bool CanAssumeTypeIsPresentInDexCache(const DexFile& dex_file, uint32_t type_idx);
180
181  bool CanAssumeStringIsPresentInDexCache(const DexFile& dex_file, uint32_t string_idx)
182      LOCKS_EXCLUDED(Locks::mutator_lock_);
183
184  // Are runtime access checks necessary in the compiled code?
185  bool CanAccessTypeWithoutChecks(uint32_t referrer_idx, const DexFile& dex_file,
186                                  uint32_t type_idx, bool* type_known_final = NULL,
187                                  bool* type_known_abstract = NULL,
188                                  bool* equals_referrers_class = NULL)
189      LOCKS_EXCLUDED(Locks::mutator_lock_);
190
191  // Are runtime access and instantiable checks necessary in the code?
192  bool CanAccessInstantiableTypeWithoutChecks(uint32_t referrer_idx, const DexFile& dex_file,
193                                              uint32_t type_idx)
194     LOCKS_EXCLUDED(Locks::mutator_lock_);
195
196  bool CanEmbedTypeInCode(const DexFile& dex_file, uint32_t type_idx,
197                          bool* is_type_initialized, bool* use_direct_type_ptr,
198                          uintptr_t* direct_type_ptr);
199
200  // Can we fast path instance field access in a verified accessor?
201  // If yes, computes field's offset and volatility and whether the method is static or not.
202  static bool ComputeSpecialAccessorInfo(uint32_t field_idx, bool is_put,
203                                         verifier::MethodVerifier* verifier,
204                                         InlineIGetIPutData* result)
205      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
206
207  // Can we fast path instance field access? Computes field's offset and volatility.
208  bool ComputeInstanceFieldInfo(uint32_t field_idx, const DexCompilationUnit* mUnit, bool is_put,
209                                int* field_offset, bool* is_volatile)
210      LOCKS_EXCLUDED(Locks::mutator_lock_);
211
212  // Can we fastpath static field access? Computes field's offset, volatility and whether the
213  // field is within the referrer (which can avoid checking class initialization).
214  bool ComputeStaticFieldInfo(uint32_t field_idx, const DexCompilationUnit* mUnit, bool is_put,
215                              int* field_offset, int* storage_index,
216                              bool* is_referrers_class, bool* is_volatile, bool* is_initialized)
217      LOCKS_EXCLUDED(Locks::mutator_lock_);
218
219  // Can we fastpath a interface, super class or virtual method call? Computes method's vtable
220  // index.
221  bool ComputeInvokeInfo(const DexCompilationUnit* mUnit, const uint32_t dex_pc,
222                         bool update_stats, bool enable_devirtualization,
223                         InvokeType* type, MethodReference* target_method, int* vtable_idx,
224                         uintptr_t* direct_code, uintptr_t* direct_method)
225      LOCKS_EXCLUDED(Locks::mutator_lock_);
226
227  const VerifiedMethod* GetVerifiedMethod(const DexFile* dex_file, uint32_t method_idx) const;
228  bool IsSafeCast(const DexCompilationUnit* mUnit, uint32_t dex_pc);
229
230  // Record patch information for later fix up.
231  void AddCodePatch(const DexFile* dex_file,
232                    uint16_t referrer_class_def_idx,
233                    uint32_t referrer_method_idx,
234                    InvokeType referrer_invoke_type,
235                    uint32_t target_method_idx,
236                    InvokeType target_invoke_type,
237                    size_t literal_offset)
238      LOCKS_EXCLUDED(compiled_methods_lock_);
239  void AddRelativeCodePatch(const DexFile* dex_file,
240                            uint16_t referrer_class_def_idx,
241                            uint32_t referrer_method_idx,
242                            InvokeType referrer_invoke_type,
243                            uint32_t target_method_idx,
244                            InvokeType target_invoke_type,
245                            size_t literal_offset,
246                            int32_t pc_relative_offset)
247      LOCKS_EXCLUDED(compiled_methods_lock_);
248  void AddMethodPatch(const DexFile* dex_file,
249                      uint16_t referrer_class_def_idx,
250                      uint32_t referrer_method_idx,
251                      InvokeType referrer_invoke_type,
252                      uint32_t target_method_idx,
253                      InvokeType target_invoke_type,
254                      size_t literal_offset)
255      LOCKS_EXCLUDED(compiled_methods_lock_);
256  void AddClassPatch(const DexFile* dex_file,
257                     uint16_t referrer_class_def_idx,
258                     uint32_t referrer_method_idx,
259                     uint32_t target_method_idx,
260                     size_t literal_offset)
261      LOCKS_EXCLUDED(compiled_methods_lock_);
262
263  bool GetSupportBootImageFixup() const {
264    return support_boot_image_fixup_;
265  }
266
267  void SetSupportBootImageFixup(bool support_boot_image_fixup) {
268    support_boot_image_fixup_ = support_boot_image_fixup;
269  }
270
271  ArenaPool& GetArenaPool() {
272    return arena_pool_;
273  }
274
275  bool WriteElf(const std::string& android_root,
276                bool is_host,
277                const std::vector<const DexFile*>& dex_files,
278                OatWriter& oat_writer,
279                File* file);
280
281  // TODO: move to a common home for llvm helpers once quick/portable are merged
282  static void InstructionSetToLLVMTarget(InstructionSet instruction_set,
283                                         std::string& target_triple,
284                                         std::string& target_cpu,
285                                         std::string& target_attr);
286
287  void SetCompilerContext(void* compiler_context) {
288    compiler_context_ = compiler_context;
289  }
290
291  void* GetCompilerContext() const {
292    return compiler_context_;
293  }
294
295  size_t GetThreadCount() const {
296    return thread_count_;
297  }
298
299  class CallPatchInformation;
300  class TypePatchInformation;
301
302  bool GetDumpPasses() const {
303    return dump_passes_;
304  }
305
306  CumulativeLogger& GetTimingsLogger() const {
307    return *timings_logger_;
308  }
309
310  class PatchInformation {
311   public:
312    const DexFile& GetDexFile() const {
313      return *dex_file_;
314    }
315    uint16_t GetReferrerClassDefIdx() const {
316      return referrer_class_def_idx_;
317    }
318    uint32_t GetReferrerMethodIdx() const {
319      return referrer_method_idx_;
320    }
321    size_t GetLiteralOffset() const {
322      return literal_offset_;
323    }
324
325    virtual bool IsCall() const {
326      return false;
327    }
328    virtual bool IsType() const {
329      return false;
330    }
331    virtual const CallPatchInformation* AsCall() const {
332      LOG(FATAL) << "Unreachable";
333      return nullptr;
334    }
335    virtual const TypePatchInformation* AsType() const {
336      LOG(FATAL) << "Unreachable";
337      return nullptr;
338    }
339
340   protected:
341    PatchInformation(const DexFile* dex_file,
342                     uint16_t referrer_class_def_idx,
343                     uint32_t referrer_method_idx,
344                     size_t literal_offset)
345      : dex_file_(dex_file),
346        referrer_class_def_idx_(referrer_class_def_idx),
347        referrer_method_idx_(referrer_method_idx),
348        literal_offset_(literal_offset) {
349      CHECK(dex_file_ != NULL);
350    }
351    virtual ~PatchInformation() {}
352
353    const DexFile* const dex_file_;
354    const uint16_t referrer_class_def_idx_;
355    const uint32_t referrer_method_idx_;
356    const size_t literal_offset_;
357
358    friend class CompilerDriver;
359  };
360
361  class CallPatchInformation : public PatchInformation {
362   public:
363    InvokeType GetReferrerInvokeType() const {
364      return referrer_invoke_type_;
365    }
366    uint32_t GetTargetMethodIdx() const {
367      return target_method_idx_;
368    }
369    InvokeType GetTargetInvokeType() const {
370      return target_invoke_type_;
371    }
372
373    const CallPatchInformation* AsCall() const {
374      return this;
375    }
376    bool IsCall() const {
377      return true;
378    }
379    virtual bool IsRelative() const {
380      return false;
381    }
382    virtual int RelativeOffset() const {
383      return 0;
384    }
385
386   protected:
387    CallPatchInformation(const DexFile* dex_file,
388                         uint16_t referrer_class_def_idx,
389                         uint32_t referrer_method_idx,
390                         InvokeType referrer_invoke_type,
391                         uint32_t target_method_idx,
392                         InvokeType target_invoke_type,
393                         size_t literal_offset)
394        : PatchInformation(dex_file, referrer_class_def_idx,
395                           referrer_method_idx, literal_offset),
396          referrer_invoke_type_(referrer_invoke_type),
397          target_method_idx_(target_method_idx),
398          target_invoke_type_(target_invoke_type) {
399    }
400
401   private:
402    const InvokeType referrer_invoke_type_;
403    const uint32_t target_method_idx_;
404    const InvokeType target_invoke_type_;
405
406    friend class CompilerDriver;
407    DISALLOW_COPY_AND_ASSIGN(CallPatchInformation);
408  };
409
410  class RelativeCallPatchInformation : public CallPatchInformation {
411   public:
412    bool IsRelative() const {
413      return true;
414    }
415    int RelativeOffset() const {
416      return offset_;
417    }
418
419   private:
420    RelativeCallPatchInformation(const DexFile* dex_file,
421                                 uint16_t referrer_class_def_idx,
422                                 uint32_t referrer_method_idx,
423                                 InvokeType referrer_invoke_type,
424                                 uint32_t target_method_idx,
425                                 InvokeType target_invoke_type,
426                                 size_t literal_offset,
427                                 int32_t pc_relative_offset)
428        : CallPatchInformation(dex_file, referrer_class_def_idx,
429                           referrer_method_idx, referrer_invoke_type,
430                           target_method_idx, target_invoke_type, literal_offset),
431          offset_(pc_relative_offset) {
432    }
433
434    const int offset_;
435
436    friend class CompilerDriver;
437    DISALLOW_COPY_AND_ASSIGN(RelativeCallPatchInformation);
438  };
439
440  class TypePatchInformation : public PatchInformation {
441   public:
442    uint32_t GetTargetTypeIdx() const {
443      return target_type_idx_;
444    }
445
446    bool IsType() const {
447      return true;
448    }
449    const TypePatchInformation* AsType() const {
450      return this;
451    }
452
453   private:
454    TypePatchInformation(const DexFile* dex_file,
455                         uint16_t referrer_class_def_idx,
456                         uint32_t referrer_method_idx,
457                         uint32_t target_type_idx,
458                         size_t literal_offset)
459        : PatchInformation(dex_file, referrer_class_def_idx,
460                           referrer_method_idx, literal_offset),
461          target_type_idx_(target_type_idx) {
462    }
463
464    const uint32_t target_type_idx_;
465
466    friend class CompilerDriver;
467    DISALLOW_COPY_AND_ASSIGN(TypePatchInformation);
468  };
469
470  const std::vector<const CallPatchInformation*>& GetCodeToPatch() const {
471    return code_to_patch_;
472  }
473  const std::vector<const CallPatchInformation*>& GetMethodsToPatch() const {
474    return methods_to_patch_;
475  }
476  const std::vector<const TypePatchInformation*>& GetClassesToPatch() const {
477    return classes_to_patch_;
478  }
479
480  // Checks if class specified by type_idx is one of the image_classes_
481  bool IsImageClass(const char* descriptor) const;
482
483  void RecordClassStatus(ClassReference ref, mirror::Class::Status status)
484      LOCKS_EXCLUDED(compiled_classes_lock_);
485
486  std::vector<uint8_t>* DeduplicateCode(const std::vector<uint8_t>& code);
487  std::vector<uint8_t>* DeduplicateMappingTable(const std::vector<uint8_t>& code);
488  std::vector<uint8_t>* DeduplicateVMapTable(const std::vector<uint8_t>& code);
489  std::vector<uint8_t>* DeduplicateGCMap(const std::vector<uint8_t>& code);
490
491 private:
492  // Compute constant code and method pointers when possible
493  void GetCodeAndMethodForDirectCall(InvokeType* type, InvokeType sharp_type,
494                                     bool no_guarantee_of_dex_cache_entry,
495                                     mirror::Class* referrer_class,
496                                     mirror::ArtMethod* method,
497                                     bool update_stats,
498                                     MethodReference* target_method,
499                                     uintptr_t* direct_code, uintptr_t* direct_method)
500      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
501
502  void PreCompile(jobject class_loader, const std::vector<const DexFile*>& dex_files,
503                  ThreadPool& thread_pool, TimingLogger& timings)
504      LOCKS_EXCLUDED(Locks::mutator_lock_);
505
506  void LoadImageClasses(TimingLogger& timings);
507
508  // Attempt to resolve all type, methods, fields, and strings
509  // referenced from code in the dex file following PathClassLoader
510  // ordering semantics.
511  void Resolve(jobject class_loader, const std::vector<const DexFile*>& dex_files,
512               ThreadPool& thread_pool, TimingLogger& timings)
513      LOCKS_EXCLUDED(Locks::mutator_lock_);
514  void ResolveDexFile(jobject class_loader, const DexFile& dex_file,
515                      ThreadPool& thread_pool, TimingLogger& timings)
516      LOCKS_EXCLUDED(Locks::mutator_lock_);
517
518  void Verify(jobject class_loader, const std::vector<const DexFile*>& dex_files,
519              ThreadPool& thread_pool, TimingLogger& timings);
520  void VerifyDexFile(jobject class_loader, const DexFile& dex_file,
521                     ThreadPool& thread_pool, TimingLogger& timings)
522      LOCKS_EXCLUDED(Locks::mutator_lock_);
523
524  void InitializeClasses(jobject class_loader, const std::vector<const DexFile*>& dex_files,
525                         ThreadPool& thread_pool, TimingLogger& timings)
526      LOCKS_EXCLUDED(Locks::mutator_lock_);
527  void InitializeClasses(jobject class_loader, const DexFile& dex_file,
528                         ThreadPool& thread_pool, TimingLogger& timings)
529      LOCKS_EXCLUDED(Locks::mutator_lock_, compiled_classes_lock_);
530
531  void UpdateImageClasses(TimingLogger& timings)
532      LOCKS_EXCLUDED(Locks::mutator_lock_);
533  static void FindClinitImageClassesCallback(mirror::Object* object, void* arg)
534      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
535
536  void Compile(jobject class_loader, const std::vector<const DexFile*>& dex_files,
537               ThreadPool& thread_pool, TimingLogger& timings);
538  void CompileDexFile(jobject class_loader, const DexFile& dex_file,
539                      ThreadPool& thread_pool, TimingLogger& timings)
540      LOCKS_EXCLUDED(Locks::mutator_lock_);
541  void CompileMethod(const DexFile::CodeItem* code_item, uint32_t access_flags,
542                     InvokeType invoke_type, uint16_t class_def_idx, uint32_t method_idx,
543                     jobject class_loader, const DexFile& dex_file,
544                     DexToDexCompilationLevel dex_to_dex_compilation_level)
545      LOCKS_EXCLUDED(compiled_methods_lock_);
546
547  static void CompileClass(const ParallelCompilationManager* context, size_t class_def_index)
548      LOCKS_EXCLUDED(Locks::mutator_lock_);
549
550  std::vector<const CallPatchInformation*> code_to_patch_;
551  std::vector<const CallPatchInformation*> methods_to_patch_;
552  std::vector<const TypePatchInformation*> classes_to_patch_;
553
554  VerificationResults* verification_results_;
555  DexFileToMethodInlinerMap* method_inliner_map_;
556
557  UniquePtr<CompilerBackend> compiler_backend_;
558
559  const InstructionSet instruction_set_;
560  const InstructionSetFeatures instruction_set_features_;
561
562  // All class references that require
563  mutable ReaderWriterMutex freezing_constructor_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
564  std::set<ClassReference> freezing_constructor_classes_ GUARDED_BY(freezing_constructor_lock_);
565
566  typedef SafeMap<const ClassReference, CompiledClass*> ClassTable;
567  // All class references that this compiler has compiled.
568  mutable Mutex compiled_classes_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
569  ClassTable compiled_classes_ GUARDED_BY(compiled_classes_lock_);
570
571  typedef SafeMap<const MethodReference, CompiledMethod*, MethodReferenceComparator> MethodTable;
572  // All method references that this compiler has compiled.
573  mutable Mutex compiled_methods_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
574  MethodTable compiled_methods_ GUARDED_BY(compiled_methods_lock_);
575
576  const bool image_;
577
578  // If image_ is true, specifies the classes that will be included in
579  // the image. Note if image_classes_ is NULL, all classes are
580  // included in the image.
581  UniquePtr<DescriptorSet> image_classes_;
582
583  size_t thread_count_;
584  uint64_t start_ns_;
585
586  UniquePtr<AOTCompilationStats> stats_;
587
588  bool dump_stats_;
589  const bool dump_passes_;
590
591  CumulativeLogger* const timings_logger_;
592
593  typedef void (*CompilerCallbackFn)(CompilerDriver& driver);
594  typedef MutexLock* (*CompilerMutexLockFn)(CompilerDriver& driver);
595
596  void* compiler_library_;
597
598  typedef void (*DexToDexCompilerFn)(CompilerDriver& driver,
599                                     const DexFile::CodeItem* code_item,
600                                     uint32_t access_flags, InvokeType invoke_type,
601                                     uint32_t class_dex_idx, uint32_t method_idx,
602                                     jobject class_loader, const DexFile& dex_file,
603                                     DexToDexCompilationLevel dex_to_dex_compilation_level);
604  DexToDexCompilerFn dex_to_dex_compiler_;
605
606  void* compiler_context_;
607
608  pthread_key_t tls_key_;
609
610  // Arena pool used by the compiler.
611  ArenaPool arena_pool_;
612
613  typedef void (*CompilerEnableAutoElfLoadingFn)(CompilerDriver& driver);
614  CompilerEnableAutoElfLoadingFn compiler_enable_auto_elf_loading_;
615
616  typedef const void* (*CompilerGetMethodCodeAddrFn)
617      (const CompilerDriver& driver, const CompiledMethod* cm, const mirror::ArtMethod* method);
618  CompilerGetMethodCodeAddrFn compiler_get_method_code_addr_;
619
620  bool support_boot_image_fixup_;
621
622  // DeDuplication data structures, these own the corresponding byte arrays.
623  class DedupeHashFunc {
624   public:
625    size_t operator()(const std::vector<uint8_t>& array) const {
626      // For small arrays compute a hash using every byte.
627      static const size_t kSmallArrayThreshold = 16;
628      size_t hash = 0x811c9dc5;
629      if (array.size() <= kSmallArrayThreshold) {
630        for (uint8_t b : array) {
631          hash = (hash * 16777619) ^ b;
632        }
633      } else {
634        // For larger arrays use the 2 bytes at 6 bytes (the location of a push registers
635        // instruction field for quick generated code on ARM) and then select a number of other
636        // values at random.
637        static const size_t kRandomHashCount = 16;
638        for (size_t i = 0; i < 2; ++i) {
639          uint8_t b = array[i + 6];
640          hash = (hash * 16777619) ^ b;
641        }
642        for (size_t i = 2; i < kRandomHashCount; ++i) {
643          size_t r = i * 1103515245 + 12345;
644          uint8_t b = array[r % array.size()];
645          hash = (hash * 16777619) ^ b;
646        }
647      }
648      hash += hash << 13;
649      hash ^= hash >> 7;
650      hash += hash << 3;
651      hash ^= hash >> 17;
652      hash += hash << 5;
653      return hash;
654    }
655  };
656  DedupeSet<std::vector<uint8_t>, size_t, DedupeHashFunc, 4> dedupe_code_;
657  DedupeSet<std::vector<uint8_t>, size_t, DedupeHashFunc, 4> dedupe_mapping_table_;
658  DedupeSet<std::vector<uint8_t>, size_t, DedupeHashFunc, 4> dedupe_vmap_table_;
659  DedupeSet<std::vector<uint8_t>, size_t, DedupeHashFunc, 4> dedupe_gc_map_;
660
661  DISALLOW_COPY_AND_ASSIGN(CompilerDriver);
662};
663
664}  // namespace art
665
666#endif  // ART_COMPILER_DRIVER_COMPILER_DRIVER_H_
667