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1 /*
2  * Copyright (C) 2015 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_DEX2OAT_DEX_DEX_TO_DEX_COMPILER_H_
18 #define ART_DEX2OAT_DEX_DEX_TO_DEX_COMPILER_H_
19 
20 #include <set>
21 #include <unordered_map>
22 #include <unordered_set>
23 
24 #include "base/bit_vector.h"
25 #include "base/mutex.h"
26 #include "dex/invoke_type.h"
27 #include "dex/method_reference.h"
28 #include "handle.h"
29 #include "quicken_info.h"
30 
31 namespace art {
32 
33 class CompiledMethod;
34 class CompilerDriver;
35 class DexCompilationUnit;
36 class DexFile;
37 
38 namespace dex {
39 struct CodeItem;
40 }  // namespace dex
41 
42 namespace mirror {
43 class ClassLoader;
44 }  // namespace mirror
45 
46 namespace optimizer {
47 
48 class DexToDexCompiler {
49  public:
50   enum class CompilationLevel {
51     kDontDexToDexCompile,   // Only meaning wrt image time interpretation.
52     kOptimize               // Perform peep-hole optimizations.
53   };
54 
55   explicit DexToDexCompiler(CompilerDriver* driver);
56 
57   CompiledMethod* CompileMethod(const dex::CodeItem* code_item,
58                                 uint32_t access_flags,
59                                 InvokeType invoke_type,
60                                 uint16_t class_def_idx,
61                                 uint32_t method_idx,
62                                 Handle<mirror::ClassLoader> class_loader,
63                                 const DexFile& dex_file,
64                                 const CompilationLevel compilation_level) WARN_UNUSED;
65 
66   void MarkForCompilation(Thread* self,
67                           const MethodReference& method_ref);
68 
69   void ClearState();
70 
71   // Unquicken all methods that have conflicting quicken info. This is not done during the
72   // quickening process to avoid race conditions.
73   void UnquickenConflictingMethods();
74 
GetDriver()75   CompilerDriver* GetDriver() {
76     return driver_;
77   }
78 
79   bool ShouldCompileMethod(const MethodReference& ref);
80 
81   // Return the number of code items to quicken.
82   size_t NumCodeItemsToQuicken(Thread* self) const;
83 
84   void SetDexFiles(const std::vector<const DexFile*>& dex_files);
85 
86  private:
87   // Holds the state for compiling a single method.
88   struct CompilationState;
89 
90   // Quicken state for a code item, may be referenced by multiple methods.
91   struct QuickenState {
92     std::vector<MethodReference> methods_;
93     std::vector<uint8_t> quicken_data_;
94     bool optimized_return_void_ = false;
95     bool conflict_ = false;
96   };
97 
98   BitVector* GetOrAddBitVectorForDex(const DexFile* dex_file) REQUIRES(lock_);
99 
100   CompilerDriver* const driver_;
101 
102   // State for adding methods (should this be in its own class?).
103   const DexFile* active_dex_file_ = nullptr;
104   BitVector* active_bit_vector_ = nullptr;
105 
106   // Lock that guards duplicate code items and the bitmap.
107   mutable Mutex lock_;
108   // Record what method references are going to get quickened.
109   std::unordered_map<const DexFile*, BitVector> should_quicken_;
110   // Guarded by lock_ during writing, accessed without a lock during quickening.
111   // This is safe because no thread is adding to the shared code items during the quickening phase.
112   std::unordered_set<const dex::CodeItem*> shared_code_items_;
113   // Blacklisted code items are unquickened in UnquickenConflictingMethods.
114   std::unordered_map<const dex::CodeItem*, QuickenState> shared_code_item_quicken_info_
115       GUARDED_BY(lock_);
116   // Number of added code items.
117   size_t num_code_items_ GUARDED_BY(lock_) = 0u;
118 };
119 
120 std::ostream& operator<<(std::ostream& os, const DexToDexCompiler::CompilationLevel& rhs);
121 
122 }  // namespace optimizer
123 
124 }  // namespace art
125 
126 #endif  // ART_DEX2OAT_DEX_DEX_TO_DEX_COMPILER_H_
127