1 /* 2 * Copyright (C) 2019 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 _LIBUNWINDSTACK_MEMORY_RANGE_H 18 #define _LIBUNWINDSTACK_MEMORY_RANGE_H 19 20 #include <stdint.h> 21 22 #include <map> 23 #include <memory> 24 #include <string> 25 26 #include <unwindstack/Memory.h> 27 28 namespace unwindstack { 29 30 // MemoryRange maps one address range onto another. 31 // The range [src_begin, src_begin + length) in the underlying Memory is mapped onto offset, 32 // such that range.read(offset) is equivalent to underlying.read(src_begin). 33 class MemoryRange : public Memory { 34 public: 35 MemoryRange(const std::shared_ptr<Memory>& memory, uint64_t begin, uint64_t length, 36 uint64_t offset); 37 virtual ~MemoryRange() = default; 38 39 size_t Read(uint64_t addr, void* dst, size_t size) override; 40 offset()41 uint64_t offset() { return offset_; } length()42 uint64_t length() { return length_; } 43 44 private: 45 std::shared_ptr<Memory> memory_; 46 uint64_t begin_; 47 uint64_t length_; 48 uint64_t offset_; 49 }; 50 51 class MemoryRanges : public Memory { 52 public: 53 MemoryRanges() = default; 54 virtual ~MemoryRanges() = default; 55 56 void Insert(MemoryRange* memory); 57 58 size_t Read(uint64_t addr, void* dst, size_t size) override; 59 60 private: 61 std::map<uint64_t, std::unique_ptr<MemoryRange>> maps_; 62 }; 63 64 } // namespace unwindstack 65 66 #endif // _LIBUNWINDSTACK_MEMORY_RANGE_H 67