| // Copyright 2021 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef SRC_DEVELOPER_DEBUG_UNWINDER_MEMORY_H_ |
| #define SRC_DEVELOPER_DEBUG_UNWINDER_MEMORY_H_ |
| |
| #include <cstdint> |
| #include <cstring> |
| #include <map> |
| |
| #include "src/developer/debug/unwinder/error.h" |
| |
| namespace unwinder { |
| |
| // Abstract representation of a readable memory space. |
| class Memory { |
| public: |
| virtual ~Memory() = default; |
| virtual Error ReadBytes(uint64_t addr, uint64_t size, void* dst) = 0; |
| |
| template <class Type> |
| [[nodiscard]] Error Read(uint64_t& addr, Type& res) { |
| if (auto err = ReadBytes(addr, sizeof(res), &res); err.has_err()) { |
| return err; |
| } |
| addr += sizeof(res); |
| return Success(); |
| } |
| |
| template <class Type> |
| [[nodiscard]] Error Read(const uint64_t& addr, Type& res) { |
| uint64_t mut = addr; |
| return Read(mut, res); |
| } |
| |
| [[nodiscard]] Error ReadSLEB128(uint64_t& addr, int64_t& res); |
| [[nodiscard]] Error ReadULEB128(uint64_t& addr, uint64_t& res); |
| |
| // Read the data in DWARF encoding. data_rel_base is only used in .eh_frame_hdr. |
| [[nodiscard]] Error ReadEncoded(uint64_t& addr, uint64_t& res, uint8_t enc, |
| uint64_t data_rel_base = 0); |
| }; |
| |
| class LocalMemory : public Memory { |
| public: |
| Error ReadBytes(uint64_t addr, uint64_t size, void* dst) override { |
| memcpy(dst, reinterpret_cast<void*>(addr), size); // NOLINT(performance-no-int-to-ptr) |
| return Success(); |
| } |
| }; |
| |
| // Bounded local memory to avoid segmentation fault. |
| class BoundedLocalMemory : public LocalMemory { |
| public: |
| ~BoundedLocalMemory() override = default; |
| void AddRegion(uint64_t base, uint64_t size); |
| Error ReadBytes(uint64_t addr, uint64_t size, void* dst) override; |
| |
| private: |
| std::map<uint64_t, uint64_t> regions_; |
| }; |
| |
| } // namespace unwinder |
| |
| #endif // SRC_DEVELOPER_DEBUG_UNWINDER_MEMORY_H_ |