compiler_driver.h revision 5dc5727261e87ba8a418e2d0e970c75f67e4ab79 
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 "class_reference.h"
26#include "compiled_class.h"
27#include "compiled_method.h"
28#include "dex_file.h"
29#include "dex/arena_allocator.h"
30#include "instruction_set.h"
31#include "invoke_type.h"
32#include "method_reference.h"
33#include "os.h"
34#include "runtime.h"
35#include "safe_map.h"
36#include "thread_pool.h"
37#include "utils/dedupe_set.h"
38
39namespace art {
40
41namespace verifier {
42class MethodVerifier;
43}  // namespace verifier
44
45class AOTCompilationStats;
46class ParallelCompilationManager;
47class DexCompilationUnit;
48class DexFileToMethodInlinerMap;
49class InlineIGetIPutData;
50class OatWriter;
51class TimingLogger;
52class VerificationResults;
53class VerifiedMethod;
54
55enum CompilerBackend {
56  kQuick,
57  kPortable,
58  kNoBackend
59};
60
61enum EntryPointCallingConvention {
62  // ABI of invocations to a method's interpreter entry point.
63  kInterpreterAbi,
64  // ABI of calls to a method's native code, only used for native methods.
65  kJniAbi,
66  // ABI of calls to a method's portable code entry point.
67  kPortableAbi,
68  // ABI of calls to a method's quick code entry point.
69  kQuickAbi
70};
71
72enum DexToDexCompilationLevel {
73  kDontDexToDexCompile,   // Only meaning wrt image time interpretation.
74  kRequired,              // Dex-to-dex compilation required for correctness.
75  kOptimize               // Perform required transformation and peep-hole optimizations.
76};
77
78// Thread-local storage compiler worker threads
79class CompilerTls {
80  public:
81    CompilerTls() : llvm_info_(NULL) {}
82    ~CompilerTls() {}
83
84    void* GetLLVMInfo() { return llvm_info_; }
85
86    void SetLLVMInfo(void* llvm_info) { llvm_info_ = llvm_info; }
87
88  private:
89    void* llvm_info_;
90};
91
92class CompilerDriver {
93 public:
94  typedef std::set<std::string> DescriptorSet;
95
96  // Create a compiler targeting the requested "instruction_set".
97  // "image" should be true if image specific optimizations should be
98  // enabled.  "image_classes" lets the compiler know what classes it
99  // can assume will be in the image, with NULL implying all available
100  // classes.
101  explicit CompilerDriver(VerificationResults* verification_results,
102                          DexFileToMethodInlinerMap* method_inliner_map,
103                          CompilerBackend compiler_backend, InstructionSet instruction_set,
104                          InstructionSetFeatures instruction_set_features,
105                          bool image, DescriptorSet* image_classes,
106                          size_t thread_count, bool dump_stats);
107
108  ~CompilerDriver();
109
110  void CompileAll(jobject class_loader, const std::vector<const DexFile*>& dex_files,
111                  TimingLogger& timings)
112      LOCKS_EXCLUDED(Locks::mutator_lock_);
113
114  // Compile a single Method.
115  void CompileOne(mirror::ArtMethod* method, TimingLogger& timings)
116      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
117
118  VerificationResults* GetVerificationResults() const {
119    return verification_results_;
120  }
121
122  DexFileToMethodInlinerMap* GetMethodInlinerMap() const {
123    return method_inliner_map_;
124  }
125
126  const InstructionSet& GetInstructionSet() const {
127    return instruction_set_;
128  }
129
130  const InstructionSetFeatures& GetInstructionSetFeatures() const {
131    return instruction_set_features_;
132  }
133
134  CompilerBackend GetCompilerBackend() const {
135    return compiler_backend_;
136  }
137
138  // Are we compiling and creating an image file?
139  bool IsImage() const {
140    return image_;
141  }
142
143  DescriptorSet* GetImageClasses() const {
144    return image_classes_.get();
145  }
146
147  CompilerTls* GetTls();
148
149  // Generate the trampolines that are invoked by unresolved direct methods.
150  const std::vector<uint8_t>* CreateInterpreterToInterpreterBridge() const
151      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
152  const std::vector<uint8_t>* CreateInterpreterToCompiledCodeBridge() const
153      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
154  const std::vector<uint8_t>* CreateJniDlsymLookup() const
155      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
156  const std::vector<uint8_t>* CreatePortableImtConflictTrampoline() const
157      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
158  const std::vector<uint8_t>* CreatePortableResolutionTrampoline() const
159      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
160  const std::vector<uint8_t>* CreatePortableToInterpreterBridge() const
161      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
162  const std::vector<uint8_t>* CreateQuickImtConflictTrampoline() const
163      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
164  const std::vector<uint8_t>* CreateQuickResolutionTrampoline() const
165      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
166  const std::vector<uint8_t>* CreateQuickToInterpreterBridge() const
167      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
168
169  CompiledClass* GetCompiledClass(ClassReference ref) const
170      LOCKS_EXCLUDED(compiled_classes_lock_);
171
172  CompiledMethod* GetCompiledMethod(MethodReference ref) const
173      LOCKS_EXCLUDED(compiled_methods_lock_);
174
175  void AddRequiresConstructorBarrier(Thread* self, const DexFile* dex_file,
176                                     uint16_t class_def_index);
177  bool RequiresConstructorBarrier(Thread* self, const DexFile* dex_file, uint16_t class_def_index);
178
179  // Callbacks from compiler to see what runtime checks must be generated.
180
181  bool CanAssumeTypeIsPresentInDexCache(const DexFile& dex_file, uint32_t type_idx);
182
183  bool CanAssumeStringIsPresentInDexCache(const DexFile& dex_file, uint32_t string_idx)
184      LOCKS_EXCLUDED(Locks::mutator_lock_);
185
186  // Are runtime access checks necessary in the compiled code?
187  bool CanAccessTypeWithoutChecks(uint32_t referrer_idx, const DexFile& dex_file,
188                                  uint32_t type_idx, bool* type_known_final = NULL,
189                                  bool* type_known_abstract = NULL,
190                                  bool* equals_referrers_class = NULL)
191      LOCKS_EXCLUDED(Locks::mutator_lock_);
192
193  // Are runtime access and instantiable checks necessary in the code?
194  bool CanAccessInstantiableTypeWithoutChecks(uint32_t referrer_idx, const DexFile& dex_file,
195                                              uint32_t type_idx)
196     LOCKS_EXCLUDED(Locks::mutator_lock_);
197
198  bool CanEmbedTypeInCode(const DexFile& dex_file, uint32_t type_idx,
199                          bool* is_type_initialized, bool* use_direct_type_ptr,
200                          uintptr_t* direct_type_ptr);
201
202  // Can we fast path instance field access in a verified accessor?
203  // If yes, computes field's offset and volatility and whether the method is static or not.
204  static bool ComputeSpecialAccessorInfo(uint32_t field_idx, bool is_put,
205                                         verifier::MethodVerifier* verifier,
206                                         InlineIGetIPutData* result)
207      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
208
209  // Can we fast path instance field access? Computes field's offset and volatility.
210  bool ComputeInstanceFieldInfo(uint32_t field_idx, const DexCompilationUnit* mUnit, bool is_put,
211                                int* field_offset, bool* is_volatile)
212      LOCKS_EXCLUDED(Locks::mutator_lock_);
213
214  // Can we fastpath static field access? Computes field's offset, volatility and whether the
215  // field is within the referrer (which can avoid checking class initialization).
216  bool ComputeStaticFieldInfo(uint32_t field_idx, const DexCompilationUnit* mUnit, bool is_put,
217                              int* field_offset, int* storage_index,
218                              bool* is_referrers_class, bool* is_volatile, bool* is_initialized)
219      LOCKS_EXCLUDED(Locks::mutator_lock_);
220
221  // Can we fastpath a interface, super class or virtual method call? Computes method's vtable
222  // index.
223  bool ComputeInvokeInfo(const DexCompilationUnit* mUnit, const uint32_t dex_pc,
224                         bool update_stats, bool enable_devirtualization,
225                         InvokeType* type, MethodReference* target_method, int* vtable_idx,
226                         uintptr_t* direct_code, uintptr_t* direct_method)
227      LOCKS_EXCLUDED(Locks::mutator_lock_);
228
229  const VerifiedMethod* GetVerifiedMethod(const DexFile* dex_file, uint32_t method_idx) const;
230  bool IsSafeCast(const DexCompilationUnit* mUnit, uint32_t dex_pc);
231
232  // Record patch information for later fix up.
233  void AddCodePatch(const DexFile* dex_file,
234                    uint16_t referrer_class_def_idx,
235                    uint32_t referrer_method_idx,
236                    InvokeType referrer_invoke_type,
237                    uint32_t target_method_idx,
238                    InvokeType target_invoke_type,
239                    size_t literal_offset)
240      LOCKS_EXCLUDED(compiled_methods_lock_);
241  void AddMethodPatch(const DexFile* dex_file,
242                      uint16_t referrer_class_def_idx,
243                      uint32_t referrer_method_idx,
244                      InvokeType referrer_invoke_type,
245                      uint32_t target_method_idx,
246                      InvokeType target_invoke_type,
247                      size_t literal_offset)
248      LOCKS_EXCLUDED(compiled_methods_lock_);
249  void AddClassPatch(const DexFile* dex_file,
250                     uint16_t referrer_class_def_idx,
251                     uint32_t referrer_method_idx,
252                     uint32_t target_method_idx,
253                     size_t literal_offset)
254      LOCKS_EXCLUDED(compiled_methods_lock_);
255
256  void SetBitcodeFileName(std::string const& filename);
257
258  bool GetSupportBootImageFixup() const {
259    return support_boot_image_fixup_;
260  }
261
262  void SetSupportBootImageFixup(bool support_boot_image_fixup) {
263    support_boot_image_fixup_ = support_boot_image_fixup;
264  }
265
266  ArenaPool& GetArenaPool() {
267    return arena_pool_;
268  }
269
270  bool WriteElf(const std::string& android_root,
271                bool is_host,
272                const std::vector<const DexFile*>& dex_files,
273                OatWriter& oat_writer,
274                File* file);
275
276  // TODO: move to a common home for llvm helpers once quick/portable are merged
277  static void InstructionSetToLLVMTarget(InstructionSet instruction_set,
278                                         std::string& target_triple,
279                                         std::string& target_cpu,
280                                         std::string& target_attr);
281
282  void SetCompilerContext(void* compiler_context) {
283    compiler_context_ = compiler_context;
284  }
285
286  void* GetCompilerContext() const {
287    return compiler_context_;
288  }
289
290  size_t GetThreadCount() const {
291    return thread_count_;
292  }
293
294  class CallPatchInformation;
295  class TypePatchInformation;
296  class PatchInformation {
297   public:
298    const DexFile& GetDexFile() const {
299      return *dex_file_;
300    }
301    uint16_t GetReferrerClassDefIdx() const {
302      return referrer_class_def_idx_;
303    }
304    uint32_t GetReferrerMethodIdx() const {
305      return referrer_method_idx_;
306    }
307    size_t GetLiteralOffset() const {
308      return literal_offset_;
309    }
310
311    virtual bool IsCall() const {
312      return false;
313    }
314    virtual bool IsType() const {
315      return false;
316    }
317    virtual const CallPatchInformation* AsCall() const {
318      LOG(FATAL) << "Unreachable";
319      return nullptr;
320    }
321    virtual const TypePatchInformation* AsType() const {
322      LOG(FATAL) << "Unreachable";
323      return nullptr;
324    }
325
326   protected:
327    PatchInformation(const DexFile* dex_file,
328                     uint16_t referrer_class_def_idx,
329                     uint32_t referrer_method_idx,
330                     size_t literal_offset)
331      : dex_file_(dex_file),
332        referrer_class_def_idx_(referrer_class_def_idx),
333        referrer_method_idx_(referrer_method_idx),
334        literal_offset_(literal_offset) {
335      CHECK(dex_file_ != NULL);
336    }
337    virtual ~PatchInformation() {}
338
339    const DexFile* const dex_file_;
340    const uint16_t referrer_class_def_idx_;
341    const uint32_t referrer_method_idx_;
342    const size_t literal_offset_;
343
344    friend class CompilerDriver;
345  };
346
347  class CallPatchInformation : public PatchInformation {
348   public:
349    InvokeType GetReferrerInvokeType() const {
350      return referrer_invoke_type_;
351    }
352    uint32_t GetTargetMethodIdx() const {
353      return target_method_idx_;
354    }
355    InvokeType GetTargetInvokeType() const {
356      return target_invoke_type_;
357    }
358
359    const CallPatchInformation* AsCall() const {
360      return this;
361    }
362    bool IsCall() const {
363      return true;
364    }
365
366   private:
367    CallPatchInformation(const DexFile* dex_file,
368                         uint16_t referrer_class_def_idx,
369                         uint32_t referrer_method_idx,
370                         InvokeType referrer_invoke_type,
371                         uint32_t target_method_idx,
372                         InvokeType target_invoke_type,
373                         size_t literal_offset)
374        : PatchInformation(dex_file, referrer_class_def_idx,
375                           referrer_method_idx, literal_offset),
376          referrer_invoke_type_(referrer_invoke_type),
377          target_method_idx_(target_method_idx),
378          target_invoke_type_(target_invoke_type) {
379    }
380
381    const InvokeType referrer_invoke_type_;
382    const uint32_t target_method_idx_;
383    const InvokeType target_invoke_type_;
384
385    friend class CompilerDriver;
386    DISALLOW_COPY_AND_ASSIGN(CallPatchInformation);
387  };
388
389  class TypePatchInformation : public PatchInformation {
390   public:
391    uint32_t GetTargetTypeIdx() const {
392      return target_type_idx_;
393    }
394
395    bool IsType() const {
396      return true;
397    }
398    const TypePatchInformation* AsType() const {
399      return this;
400    }
401
402   private:
403    TypePatchInformation(const DexFile* dex_file,
404                         uint16_t referrer_class_def_idx,
405                         uint32_t referrer_method_idx,
406                         uint32_t target_type_idx,
407                         size_t literal_offset)
408        : PatchInformation(dex_file, referrer_class_def_idx,
409                           referrer_method_idx, literal_offset),
410          target_type_idx_(target_type_idx) {
411    }
412
413    const uint32_t target_type_idx_;
414
415    friend class CompilerDriver;
416    DISALLOW_COPY_AND_ASSIGN(TypePatchInformation);
417  };
418
419  const std::vector<const CallPatchInformation*>& GetCodeToPatch() const {
420    return code_to_patch_;
421  }
422  const std::vector<const CallPatchInformation*>& GetMethodsToPatch() const {
423    return methods_to_patch_;
424  }
425  const std::vector<const TypePatchInformation*>& GetClassesToPatch() const {
426    return classes_to_patch_;
427  }
428
429  // Checks if class specified by type_idx is one of the image_classes_
430  bool IsImageClass(const char* descriptor) const;
431
432  void RecordClassStatus(ClassReference ref, mirror::Class::Status status)
433      LOCKS_EXCLUDED(compiled_classes_lock_);
434
435  std::vector<uint8_t>* DeduplicateCode(const std::vector<uint8_t>& code);
436  std::vector<uint8_t>* DeduplicateMappingTable(const std::vector<uint8_t>& code);
437  std::vector<uint8_t>* DeduplicateVMapTable(const std::vector<uint8_t>& code);
438  std::vector<uint8_t>* DeduplicateGCMap(const std::vector<uint8_t>& code);
439
440 private:
441  // Compute constant code and method pointers when possible
442  void GetCodeAndMethodForDirectCall(InvokeType* type, InvokeType sharp_type,
443                                     bool no_guarantee_of_dex_cache_entry,
444                                     mirror::Class* referrer_class,
445                                     mirror::ArtMethod* method,
446                                     bool update_stats,
447                                     MethodReference* target_method,
448                                     uintptr_t* direct_code, uintptr_t* direct_method)
449      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
450
451  void PreCompile(jobject class_loader, const std::vector<const DexFile*>& dex_files,
452                  ThreadPool& thread_pool, TimingLogger& timings)
453      LOCKS_EXCLUDED(Locks::mutator_lock_);
454
455  void LoadImageClasses(TimingLogger& timings);
456
457  // Attempt to resolve all type, methods, fields, and strings
458  // referenced from code in the dex file following PathClassLoader
459  // ordering semantics.
460  void Resolve(jobject class_loader, const std::vector<const DexFile*>& dex_files,
461               ThreadPool& thread_pool, TimingLogger& timings)
462      LOCKS_EXCLUDED(Locks::mutator_lock_);
463  void ResolveDexFile(jobject class_loader, const DexFile& dex_file,
464                      ThreadPool& thread_pool, TimingLogger& timings)
465      LOCKS_EXCLUDED(Locks::mutator_lock_);
466
467  void Verify(jobject class_loader, const std::vector<const DexFile*>& dex_files,
468              ThreadPool& thread_pool, TimingLogger& timings);
469  void VerifyDexFile(jobject class_loader, const DexFile& dex_file,
470                     ThreadPool& thread_pool, TimingLogger& timings)
471      LOCKS_EXCLUDED(Locks::mutator_lock_);
472
473  void InitializeClasses(jobject class_loader, const std::vector<const DexFile*>& dex_files,
474                         ThreadPool& thread_pool, TimingLogger& timings)
475      LOCKS_EXCLUDED(Locks::mutator_lock_);
476  void InitializeClasses(jobject class_loader, const DexFile& dex_file,
477                         ThreadPool& thread_pool, TimingLogger& timings)
478      LOCKS_EXCLUDED(Locks::mutator_lock_, compiled_classes_lock_);
479
480  void UpdateImageClasses(TimingLogger& timings)
481      LOCKS_EXCLUDED(Locks::mutator_lock_);
482  static void FindClinitImageClassesCallback(mirror::Object* object, void* arg)
483      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
484
485  void Compile(jobject class_loader, const std::vector<const DexFile*>& dex_files,
486               ThreadPool& thread_pool, TimingLogger& timings);
487  void CompileDexFile(jobject class_loader, const DexFile& dex_file,
488                      ThreadPool& thread_pool, TimingLogger& timings)
489      LOCKS_EXCLUDED(Locks::mutator_lock_);
490  void CompileMethod(const DexFile::CodeItem* code_item, uint32_t access_flags,
491                     InvokeType invoke_type, uint16_t class_def_idx, uint32_t method_idx,
492                     jobject class_loader, const DexFile& dex_file,
493                     DexToDexCompilationLevel dex_to_dex_compilation_level)
494      LOCKS_EXCLUDED(compiled_methods_lock_);
495
496  static void CompileClass(const ParallelCompilationManager* context, size_t class_def_index)
497      LOCKS_EXCLUDED(Locks::mutator_lock_);
498
499  std::vector<const CallPatchInformation*> code_to_patch_;
500  std::vector<const CallPatchInformation*> methods_to_patch_;
501  std::vector<const TypePatchInformation*> classes_to_patch_;
502
503  VerificationResults* verification_results_;
504  DexFileToMethodInlinerMap* method_inliner_map_;
505
506  CompilerBackend compiler_backend_;
507
508  const InstructionSet instruction_set_;
509  const InstructionSetFeatures instruction_set_features_;
510
511  // All class references that require
512  mutable ReaderWriterMutex freezing_constructor_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
513  std::set<ClassReference> freezing_constructor_classes_ GUARDED_BY(freezing_constructor_lock_);
514
515  typedef SafeMap<const ClassReference, CompiledClass*> ClassTable;
516  // All class references that this compiler has compiled.
517  mutable Mutex compiled_classes_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
518  ClassTable compiled_classes_ GUARDED_BY(compiled_classes_lock_);
519
520  typedef SafeMap<const MethodReference, CompiledMethod*, MethodReferenceComparator> MethodTable;
521  // All method references that this compiler has compiled.
522  mutable Mutex compiled_methods_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
523  MethodTable compiled_methods_ GUARDED_BY(compiled_methods_lock_);
524
525  const bool image_;
526
527  // If image_ is true, specifies the classes that will be included in
528  // the image. Note if image_classes_ is NULL, all classes are
529  // included in the image.
530  UniquePtr<DescriptorSet> image_classes_;
531
532  size_t thread_count_;
533  uint64_t start_ns_;
534
535  UniquePtr<AOTCompilationStats> stats_;
536
537  bool dump_stats_;
538
539  typedef void (*CompilerCallbackFn)(CompilerDriver& driver);
540  typedef MutexLock* (*CompilerMutexLockFn)(CompilerDriver& driver);
541
542  void* compiler_library_;
543
544  typedef CompiledMethod* (*CompilerFn)(CompilerDriver& driver,
545                                        const DexFile::CodeItem* code_item,
546                                        uint32_t access_flags, InvokeType invoke_type,
547                                        uint32_t class_dex_idx, uint32_t method_idx,
548                                        jobject class_loader, const DexFile& dex_file);
549
550  typedef void (*DexToDexCompilerFn)(CompilerDriver& driver,
551                                     const DexFile::CodeItem* code_item,
552                                     uint32_t access_flags, InvokeType invoke_type,
553                                     uint32_t class_dex_idx, uint32_t method_idx,
554                                     jobject class_loader, const DexFile& dex_file,
555                                     DexToDexCompilationLevel dex_to_dex_compilation_level);
556  CompilerFn compiler_;
557#ifdef ART_SEA_IR_MODE
558  CompilerFn sea_ir_compiler_;
559#endif
560
561  DexToDexCompilerFn dex_to_dex_compiler_;
562
563  void* compiler_context_;
564
565  typedef CompiledMethod* (*JniCompilerFn)(CompilerDriver& driver,
566                                           uint32_t access_flags, uint32_t method_idx,
567                                           const DexFile& dex_file);
568  JniCompilerFn jni_compiler_;
569
570  pthread_key_t tls_key_;
571
572  // Arena pool used by the compiler.
573  ArenaPool arena_pool_;
574
575  typedef void (*CompilerEnableAutoElfLoadingFn)(CompilerDriver& driver);
576  CompilerEnableAutoElfLoadingFn compiler_enable_auto_elf_loading_;
577
578  typedef const void* (*CompilerGetMethodCodeAddrFn)
579      (const CompilerDriver& driver, const CompiledMethod* cm, const mirror::ArtMethod* method);
580  CompilerGetMethodCodeAddrFn compiler_get_method_code_addr_;
581
582  bool support_boot_image_fixup_;
583
584  // DeDuplication data structures, these own the corresponding byte arrays.
585  class DedupeHashFunc {
586   public:
587    size_t operator()(const std::vector<uint8_t>& array) const {
588      // For small arrays compute a hash using every byte.
589      static const size_t kSmallArrayThreshold = 16;
590      size_t hash = 0x811c9dc5;
591      if (array.size() <= kSmallArrayThreshold) {
592        for (uint8_t b : array) {
593          hash = (hash * 16777619) ^ b;
594        }
595      } else {
596        // For larger arrays use the 2 bytes at 6 bytes (the location of a push registers
597        // instruction field for quick generated code on ARM) and then select a number of other
598        // values at random.
599        static const size_t kRandomHashCount = 16;
600        for (size_t i = 0; i < 2; ++i) {
601          uint8_t b = array[i + 6];
602          hash = (hash * 16777619) ^ b;
603        }
604        for (size_t i = 2; i < kRandomHashCount; ++i) {
605          size_t r = i * 1103515245 + 12345;
606          uint8_t b = array[r % array.size()];
607          hash = (hash * 16777619) ^ b;
608        }
609      }
610      hash += hash << 13;
611      hash ^= hash >> 7;
612      hash += hash << 3;
613      hash ^= hash >> 17;
614      hash += hash << 5;
615      return hash;
616    }
617  };
618  DedupeSet<std::vector<uint8_t>, size_t, DedupeHashFunc, 4> dedupe_code_;
619  DedupeSet<std::vector<uint8_t>, size_t, DedupeHashFunc, 4> dedupe_mapping_table_;
620  DedupeSet<std::vector<uint8_t>, size_t, DedupeHashFunc, 4> dedupe_vmap_table_;
621  DedupeSet<std::vector<uint8_t>, size_t, DedupeHashFunc, 4> dedupe_gc_map_;
622
623  DISALLOW_COPY_AND_ASSIGN(CompilerDriver);
624};
625
626}  // namespace art
627
628#endif  // ART_COMPILER_DRIVER_COMPILER_DRIVER_H_
629