1 /* 2 * Copyright (C) 2016 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 #pragma once 18 19 #include <stdint.h> 20 21 #include <memory> 22 23 namespace unwindstack { 24 25 // Forward declarations. 26 class Memory; 27 28 class DwarfMemory { 29 public: DwarfMemory(std::shared_ptr<Memory> & memory)30 DwarfMemory(std::shared_ptr<Memory>& memory) : memory_(memory) {} 31 virtual ~DwarfMemory() = default; 32 33 bool ReadBytes(void* dst, size_t num_bytes); 34 35 template <typename SignedType> 36 bool ReadSigned(uint64_t* value); 37 38 bool ReadULEB128(uint64_t* value); 39 40 bool ReadSLEB128(int64_t* value); 41 42 template <typename AddressType> 43 size_t GetEncodedSize(uint8_t encoding); 44 45 bool AdjustEncodedValue(uint8_t encoding, uint64_t* value); 46 47 template <typename AddressType> 48 bool ReadEncodedValue(uint8_t encoding, uint64_t* value); 49 cur_offset()50 uint64_t cur_offset() { return cur_offset_; } set_cur_offset(uint64_t cur_offset)51 void set_cur_offset(uint64_t cur_offset) { cur_offset_ = cur_offset; } 52 set_pc_offset(int64_t offset)53 void set_pc_offset(int64_t offset) { pc_offset_ = offset; } clear_pc_offset()54 void clear_pc_offset() { pc_offset_ = INT64_MAX; } 55 set_data_offset(uint64_t offset)56 void set_data_offset(uint64_t offset) { data_offset_ = offset; } clear_data_offset()57 void clear_data_offset() { data_offset_ = static_cast<uint64_t>(-1); } 58 set_func_offset(uint64_t offset)59 void set_func_offset(uint64_t offset) { func_offset_ = offset; } clear_func_offset()60 void clear_func_offset() { func_offset_ = static_cast<uint64_t>(-1); } 61 set_text_offset(uint64_t offset)62 void set_text_offset(uint64_t offset) { text_offset_ = offset; } clear_text_offset()63 void clear_text_offset() { text_offset_ = static_cast<uint64_t>(-1); } 64 65 private: 66 std::shared_ptr<Memory> memory_; 67 uint64_t cur_offset_ = 0; 68 69 int64_t pc_offset_ = INT64_MAX; 70 uint64_t data_offset_ = static_cast<uint64_t>(-1); 71 uint64_t func_offset_ = static_cast<uint64_t>(-1); 72 uint64_t text_offset_ = static_cast<uint64_t>(-1); 73 }; 74 75 } // namespace unwindstack 76