1 /* 2 * Copyright (C) 2018 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_DEX_REGISTER_LOCATION_H_ 18 #define ART_RUNTIME_DEX_REGISTER_LOCATION_H_ 19 20 #include <array> 21 #include <cstdint> 22 23 #include "base/dchecked_vector.h" 24 #include "base/memory_region.h" 25 26 namespace art { 27 28 // Dex register location container used by DexRegisterMap and StackMapStream. 29 class DexRegisterLocation { 30 public: 31 enum class Kind : int32_t { 32 kInvalid = -2, // only used internally during register map decoding. 33 kNone = -1, // vreg has not been set. 34 kInStack, // vreg is on the stack, value holds the stack offset. 35 kConstant, // vreg is a constant value. 36 kInRegister, // vreg is in low 32 bits of a core physical register. 37 kInRegisterHigh, // vreg is in high 32 bits of a core physical register. 38 kInFpuRegister, // vreg is in low 32 bits of an FPU register. 39 kInFpuRegisterHigh, // vreg is in high 32 bits of an FPU register. 40 }; 41 DexRegisterLocation(Kind kind,int32_t value)42 DexRegisterLocation(Kind kind, int32_t value) : kind_(kind), value_(value) {} 43 None()44 static DexRegisterLocation None() { return DexRegisterLocation(Kind::kNone, 0); } Invalid()45 static DexRegisterLocation Invalid() { return DexRegisterLocation(Kind::kInvalid, 0); } 46 IsLive()47 bool IsLive() const { return kind_ != Kind::kNone; } 48 GetKind()49 Kind GetKind() const { return kind_; } 50 GetValue()51 int32_t GetValue() const { return value_; } 52 53 bool operator==(DexRegisterLocation other) const { 54 return kind_ == other.kind_ && value_ == other.value_; 55 } 56 57 bool operator!=(DexRegisterLocation other) const { 58 return !(*this == other); 59 } 60 GetStackOffsetInBytes()61 int32_t GetStackOffsetInBytes() const { 62 DCHECK(kind_ == Kind::kInStack); 63 return value_; 64 } 65 GetConstant()66 int32_t GetConstant() const { 67 DCHECK(kind_ == Kind::kConstant); 68 return value_; 69 } 70 GetMachineRegister()71 int32_t GetMachineRegister() const { 72 DCHECK(kind_ == Kind::kInRegister || 73 kind_ == Kind::kInRegisterHigh || 74 kind_ == Kind::kInFpuRegister || 75 kind_ == Kind::kInFpuRegisterHigh); 76 return value_; 77 } 78 79 private: DexRegisterLocation()80 DexRegisterLocation() {} 81 82 Kind kind_; 83 int32_t value_; 84 85 friend class DexRegisterMap; // Allow creation of uninitialized array of locations. 86 }; 87 88 std::ostream& operator<<(std::ostream& stream, DexRegisterLocation::Kind kind); 89 std::ostream& operator<<(std::ostream& stream, const DexRegisterLocation& reg); 90 91 } // namespace art 92 93 #endif // ART_RUNTIME_DEX_REGISTER_LOCATION_H_ 94