1 /* 2 * Copyright (C) 2012 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_VERIFIER_REG_TYPE_CACHE_H_ 18 #define ART_RUNTIME_VERIFIER_REG_TYPE_CACHE_H_ 19 20 #include "base/casts.h" 21 #include "base/macros.h" 22 #include "base/stl_util.h" 23 #include "object_callbacks.h" 24 #include "reg_type.h" 25 #include "runtime.h" 26 27 #include <stdint.h> 28 #include <vector> 29 30 namespace art { 31 namespace mirror { 32 class Class; 33 class ClassLoader; 34 } // namespace mirror 35 class StringPiece; 36 37 namespace verifier { 38 39 class RegType; 40 41 class RegTypeCache { 42 public: 43 explicit RegTypeCache(bool can_load_classes); 44 ~RegTypeCache(); 45 static void Init() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 46 if (!RegTypeCache::primitive_initialized_) { 47 CHECK_EQ(RegTypeCache::primitive_count_, 0); 48 CreatePrimitiveAndSmallConstantTypes(); 49 CHECK_EQ(RegTypeCache::primitive_count_, kNumPrimitivesAndSmallConstants); 50 RegTypeCache::primitive_initialized_ = true; 51 } 52 } 53 static void ShutDown(); 54 RegType& GetFromId(uint16_t id) const; 55 RegType& From(mirror::ClassLoader* loader, const char* descriptor, bool precise) 56 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 57 RegType& FromClass(const char* descriptor, mirror::Class* klass, bool precise) 58 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 59 ConstantType& FromCat1Const(int32_t value, bool precise) 60 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 61 ConstantType& FromCat2ConstLo(int32_t value, bool precise) 62 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 63 ConstantType& FromCat2ConstHi(int32_t value, bool precise) 64 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 65 RegType& FromDescriptor(mirror::ClassLoader* loader, const char* descriptor, bool precise) 66 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 67 RegType& FromUnresolvedMerge(RegType& left, RegType& right) 68 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 69 RegType& FromUnresolvedSuperClass(RegType& child) 70 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 71 RegType& JavaLangString() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 72 // String is final and therefore always precise. 73 return From(NULL, "Ljava/lang/String;", true); 74 } 75 RegType& JavaLangThrowable(bool precise) 76 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 77 return From(NULL, "Ljava/lang/Throwable;", precise); 78 } 79 ConstantType& Zero() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 80 return FromCat1Const(0, true); 81 } 82 ConstantType& One() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 83 return FromCat1Const(1, true); 84 } 85 size_t GetCacheSize() { 86 return entries_.size(); 87 } 88 static RegType& Boolean() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 89 return *BooleanType::GetInstance(); 90 } 91 static RegType& Byte() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 92 return *ByteType::GetInstance(); 93 } 94 static RegType& Char() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 95 return *CharType::GetInstance(); 96 } 97 static RegType& Short() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 98 return *ShortType::GetInstance(); 99 } 100 static RegType& Integer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 101 return *IntegerType::GetInstance(); 102 } 103 static RegType& Float() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 104 return *FloatType::GetInstance(); 105 } 106 static RegType& LongLo() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 107 return *LongLoType::GetInstance(); 108 } 109 static RegType& LongHi() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 110 return *LongHiType::GetInstance(); 111 } 112 static RegType& DoubleLo() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 113 return *DoubleLoType::GetInstance(); 114 } 115 static RegType& DoubleHi() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 116 return *DoubleHiType::GetInstance(); 117 } 118 static RegType& Undefined() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 119 return *UndefinedType::GetInstance(); 120 } 121 static RegType& Conflict() { 122 return *ConflictType::GetInstance(); 123 } 124 RegType& JavaLangClass(bool precise) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 125 return From(NULL, "Ljava/lang/Class;", precise); 126 } 127 RegType& JavaLangObject(bool precise) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 128 return From(NULL, "Ljava/lang/Object;", precise); 129 } 130 UninitializedType& Uninitialized(RegType& type, uint32_t allocation_pc) 131 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 132 // Create an uninitialized 'this' argument for the given type. 133 UninitializedType& UninitializedThisArgument(RegType& type) 134 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 135 RegType& FromUninitialized(RegType& uninit_type) 136 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 137 ImpreciseConstType& ByteConstant() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 138 ImpreciseConstType& CharConstant() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 139 ImpreciseConstType& ShortConstant() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 140 ImpreciseConstType& IntConstant() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 141 ImpreciseConstType& PosByteConstant() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 142 ImpreciseConstType& PosShortConstant() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 143 RegType& GetComponentType(RegType& array, mirror::ClassLoader* loader) 144 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 145 void Dump(std::ostream& os) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 146 RegType& RegTypeFromPrimitiveType(Primitive::Type) const; 147 148 void VisitRoots(RootCallback* callback, void* arg) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 149 static void VisitStaticRoots(RootCallback* callback, void* arg) 150 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 151 152 private: 153 void FillPrimitiveAndSmallConstantTypes() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 154 mirror::Class* ResolveClass(const char* descriptor, mirror::ClassLoader* loader) 155 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 156 bool MatchDescriptor(size_t idx, const StringPiece& descriptor, bool precise) 157 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 158 ConstantType& FromCat1NonSmallConstant(int32_t value, bool precise) 159 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 160 161 void AddEntry(RegType* new_entry); 162 163 template <class Type> 164 static Type* CreatePrimitiveTypeInstance(const std::string& descriptor) 165 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 166 static void CreatePrimitiveAndSmallConstantTypes() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 167 168 // The actual storage for the RegTypes. 169 std::vector<RegType*> entries_; 170 171 // A quick look up for popular small constants. 172 static constexpr int32_t kMinSmallConstant = -1; 173 static constexpr int32_t kMaxSmallConstant = 4; 174 static PreciseConstType* small_precise_constants_[kMaxSmallConstant - kMinSmallConstant + 1]; 175 176 static constexpr size_t kNumPrimitivesAndSmallConstants = 177 12 + (kMaxSmallConstant - kMinSmallConstant + 1); 178 179 // Have the well known global primitives been created? 180 static bool primitive_initialized_; 181 182 // Number of well known primitives that will be copied into a RegTypeCache upon construction. 183 static uint16_t primitive_count_; 184 185 // Whether or not we're allowed to load classes. 186 const bool can_load_classes_; 187 188 DISALLOW_COPY_AND_ASSIGN(RegTypeCache); 189 }; 190 191 } // namespace verifier 192 } // namespace art 193 194 #endif // ART_RUNTIME_VERIFIER_REG_TYPE_CACHE_H_ 195
