f447c8eb20
Also change one of the reads to be explicitly ReadField instead of an overloaded Read function. Bug: 23762183 Test: Passes new unit tests. Change-Id: Id848f7b632f67df0c5b7318d9e588942cfd2099a
145 lines
3.5 KiB
C++
145 lines
3.5 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _LIBUNWINDSTACK_MEMORY_H
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#define _LIBUNWINDSTACK_MEMORY_H
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#include <assert.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <string>
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#include <vector>
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class Memory {
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public:
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Memory() = default;
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virtual ~Memory() = default;
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virtual bool ReadString(uint64_t addr, std::string* string, uint64_t max_read = UINT64_MAX);
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virtual bool Read(uint64_t addr, void* dst, size_t size) = 0;
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inline bool ReadField(uint64_t addr, void* start, void* field, size_t size) {
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if (reinterpret_cast<uintptr_t>(field) < reinterpret_cast<uintptr_t>(start)) {
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return false;
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}
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uint64_t offset = reinterpret_cast<uintptr_t>(field) - reinterpret_cast<uintptr_t>(start);
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if (__builtin_add_overflow(addr, offset, &offset)) {
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return false;
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}
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// The read will check if offset + size overflows.
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return Read(offset, field, size);
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}
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inline bool Read32(uint64_t addr, uint32_t* dst) {
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return Read(addr, dst, sizeof(uint32_t));
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}
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inline bool Read64(uint64_t addr, uint64_t* dst) {
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return Read(addr, dst, sizeof(uint64_t));
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}
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};
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class MemoryBuffer : public Memory {
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public:
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MemoryBuffer() = default;
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virtual ~MemoryBuffer() = default;
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bool Read(uint64_t addr, void* dst, size_t size) override;
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uint8_t* GetPtr(size_t offset);
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void Resize(size_t size) { raw_.resize(size); }
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uint64_t Size() { return raw_.size(); }
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private:
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std::vector<uint8_t> raw_;
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};
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class MemoryFileAtOffset : public Memory {
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public:
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MemoryFileAtOffset() = default;
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virtual ~MemoryFileAtOffset();
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bool Init(const std::string& file, uint64_t offset, uint64_t size = UINT64_MAX);
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bool Read(uint64_t addr, void* dst, size_t size) override;
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void Clear();
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protected:
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size_t size_ = 0;
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size_t offset_ = 0;
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uint8_t* data_ = nullptr;
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};
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class MemoryOffline : public MemoryFileAtOffset {
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public:
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MemoryOffline() = default;
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virtual ~MemoryOffline() = default;
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bool Init(const std::string& file, uint64_t offset);
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bool Read(uint64_t addr, void* dst, size_t size) override;
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private:
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uint64_t start_;
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};
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class MemoryRemote : public Memory {
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public:
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MemoryRemote(pid_t pid) : pid_(pid) {}
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virtual ~MemoryRemote() = default;
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bool Read(uint64_t addr, void* dst, size_t size) override;
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pid_t pid() { return pid_; }
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protected:
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virtual bool PtraceRead(uint64_t addr, long* value);
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private:
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pid_t pid_;
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};
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class MemoryLocal : public Memory {
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public:
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MemoryLocal() = default;
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virtual ~MemoryLocal() = default;
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bool Read(uint64_t addr, void* dst, size_t size) override;
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};
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class MemoryRange : public Memory {
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public:
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MemoryRange(Memory* memory, uint64_t begin, uint64_t end)
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: memory_(memory), begin_(begin), length_(end - begin) {
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assert(end > begin);
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}
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virtual ~MemoryRange() { delete memory_; }
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bool Read(uint64_t addr, void* dst, size_t size) override;
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private:
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Memory* memory_;
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uint64_t begin_;
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uint64_t length_;
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};
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#endif // _LIBUNWINDSTACK_MEMORY_H
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