Mathieu Chartier | e5f13e5 | 2015-02-24 09:37:21 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 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 | #ifndef ART_RUNTIME_JIT_JIT_CODE_CACHE_H_ |
| 18 | #define ART_RUNTIME_JIT_JIT_CODE_CACHE_H_ |
| 19 | |
| 20 | #include "instrumentation.h" |
| 21 | |
| 22 | #include "atomic.h" |
| 23 | #include "base/macros.h" |
| 24 | #include "base/mutex.h" |
| 25 | #include "gc_root.h" |
| 26 | #include "jni.h" |
| 27 | #include "oat_file.h" |
| 28 | #include "object_callbacks.h" |
| 29 | #include "safe_map.h" |
| 30 | #include "thread_pool.h" |
| 31 | |
| 32 | namespace art { |
| 33 | |
| 34 | class CompiledMethod; |
| 35 | class CompilerCallbacks; |
| 36 | |
| 37 | namespace mirror { |
| 38 | class ArtMethod; |
| 39 | } // namespcae mirror |
| 40 | |
| 41 | namespace jit { |
| 42 | |
| 43 | class JitInstrumentationCache; |
| 44 | |
| 45 | class JitCodeCache { |
| 46 | public: |
| 47 | static constexpr size_t kMaxCapacity = 1 * GB; |
| 48 | static constexpr size_t kDefaultCapacity = 2 * MB; |
| 49 | |
| 50 | static JitCodeCache* Create(size_t capacity, std::string* error_msg); |
| 51 | |
| 52 | const uint8_t* CodeCachePtr() const { |
| 53 | return code_cache_ptr_; |
| 54 | } |
| 55 | size_t CodeCacheSize() const { |
| 56 | return code_cache_ptr_ - code_cache_begin_; |
| 57 | } |
| 58 | size_t CodeCacheRemain() const { |
| 59 | return code_cache_end_ - code_cache_ptr_; |
| 60 | } |
| 61 | size_t DataCacheSize() const { |
| 62 | return data_cache_ptr_ - data_cache_begin_; |
| 63 | } |
| 64 | size_t DataCacheRemain() const { |
| 65 | return data_cache_end_ - data_cache_ptr_; |
| 66 | } |
| 67 | size_t NumMethods() const { |
| 68 | return num_methods_; |
| 69 | } |
| 70 | |
| 71 | bool ContainsMethod(mirror::ArtMethod* method) const |
| 72 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); |
| 73 | bool ContainsCodePtr(const void* ptr) const; |
| 74 | |
| 75 | uint8_t* ReserveCode(Thread* self, size_t size) LOCKS_EXCLUDED(lock_); |
| 76 | |
| 77 | uint8_t* AddDataArray(Thread* self, const uint8_t* begin, const uint8_t* end) |
| 78 | LOCKS_EXCLUDED(lock_); |
| 79 | |
| 80 | // Get code for a method, returns null if it is not in the jit cache. |
| 81 | const void* GetCodeFor(mirror::ArtMethod* method) |
| 82 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) LOCKS_EXCLUDED(lock_); |
| 83 | |
| 84 | void SaveCompiledCode(mirror::ArtMethod* method, const void* old_code_ptr) |
| 85 | SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) LOCKS_EXCLUDED(lock_); |
| 86 | |
| 87 | private: |
| 88 | // Takes ownership of code_mem_map. |
| 89 | explicit JitCodeCache(MemMap* code_mem_map); |
| 90 | void FlushInstructionCache(); |
| 91 | |
| 92 | Mutex lock_; |
| 93 | // Mem map which holds code and data. We do this since we need to have 32 bit offsets from method |
| 94 | // headers in code cache which point to things in the data cache. If the maps are more than 4GB |
| 95 | // apart, having multiple maps wouldn't work. |
| 96 | std::unique_ptr<MemMap> mem_map_; |
| 97 | // Code cache section. |
| 98 | uint8_t* code_cache_ptr_; |
| 99 | const uint8_t* code_cache_begin_; |
| 100 | const uint8_t* code_cache_end_; |
| 101 | // Data cache section. |
| 102 | uint8_t* data_cache_ptr_; |
| 103 | const uint8_t* data_cache_begin_; |
| 104 | const uint8_t* data_cache_end_; |
| 105 | size_t num_methods_; |
| 106 | // TODO: This relies on methods not moving. |
| 107 | // This map holds code for methods if they were deoptimized by the instrumentation stubs. This is |
| 108 | // required since we have to implement ClassLinker::GetQuickOatCodeFor for walking stacks. |
| 109 | SafeMap<mirror::ArtMethod*, const void*> method_code_map_; |
| 110 | |
| 111 | DISALLOW_COPY_AND_ASSIGN(JitCodeCache); |
| 112 | }; |
| 113 | |
| 114 | |
| 115 | } // namespace jit |
| 116 | } // namespace art |
| 117 | |
| 118 | #endif // ART_RUNTIME_JIT_JIT_CODE_CACHE_H_ |