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_RUNTIME_OFFSETS_H_ 18 #define ART_RUNTIME_OFFSETS_H_ 19 20 #include <iosfwd> 21 22 #include "base/enums.h" 23 #include "runtime_globals.h" 24 25 namespace art { 26 27 // Allow the meaning of offsets to be strongly typed. 28 class Offset { 29 public: Offset(size_t val)30 constexpr explicit Offset(size_t val) : val_(val) {} Int32Value()31 constexpr int32_t Int32Value() const { 32 return static_cast<int32_t>(val_); 33 } Uint32Value()34 constexpr uint32_t Uint32Value() const { 35 return static_cast<uint32_t>(val_); 36 } SizeValue()37 constexpr size_t SizeValue() const { 38 return val_; 39 } 40 constexpr bool operator==(Offset o) const { 41 return SizeValue() == o.SizeValue(); 42 } 43 constexpr bool operator!=(Offset o) const { 44 return !(*this == o); 45 } 46 47 protected: 48 size_t val_; 49 }; 50 std::ostream& operator<<(std::ostream& os, const Offset& offs); 51 52 // Offsets relative to the current frame. 53 class FrameOffset : public Offset { 54 public: FrameOffset(size_t val)55 constexpr explicit FrameOffset(size_t val) : Offset(val) {} 56 bool operator>(FrameOffset other) const { return val_ > other.val_; } 57 bool operator<(FrameOffset other) const { return val_ < other.val_; } 58 }; 59 60 // Offsets relative to the current running thread. 61 template<PointerSize pointer_size> 62 class ThreadOffset : public Offset { 63 public: ThreadOffset(size_t val)64 constexpr explicit ThreadOffset(size_t val) : Offset(val) {} 65 }; 66 67 using ThreadOffset32 = ThreadOffset<PointerSize::k32>; 68 using ThreadOffset64 = ThreadOffset<PointerSize::k64>; 69 70 // Offsets relative to an object. 71 class MemberOffset : public Offset { 72 public: MemberOffset(size_t val)73 constexpr explicit MemberOffset(size_t val) : Offset(val) {} 74 }; 75 76 } // namespace art 77 78 #endif // ART_RUNTIME_OFFSETS_H_ 79