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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _LIBUNWINDSTACK_DWARF_SECTION_H
#define _LIBUNWINDSTACK_DWARF_SECTION_H
#include <stdint.h>
#include <iterator>
#include <unordered_map>
#include <unwindstack/DwarfError.h>
#include <unwindstack/DwarfLocation.h>
#include <unwindstack/DwarfMemory.h>
#include <unwindstack/DwarfStructs.h>
namespace unwindstack {
// Forward declarations.
class Memory;
class Regs;
template <typename AddressType>
struct RegsInfo;
class DwarfSection {
public:
DwarfSection(Memory* memory);
virtual ~DwarfSection() = default;
class iterator : public std::iterator<std::bidirectional_iterator_tag, DwarfFde*> {
public:
iterator(DwarfSection* section, size_t index) : section_(section), index_(index) {}
iterator& operator++() {
index_++;
return *this;
}
iterator& operator++(int increment) {
index_ += increment;
return *this;
}
iterator& operator--() {
index_--;
return *this;
}
iterator& operator--(int decrement) {
index_ -= decrement;
return *this;
}
bool operator==(const iterator& rhs) { return this->index_ == rhs.index_; }
bool operator!=(const iterator& rhs) { return this->index_ != rhs.index_; }
const DwarfFde* operator*() { return section_->GetFdeFromIndex(index_); }
private:
DwarfSection* section_ = nullptr;
size_t index_ = 0;
};
iterator begin() { return iterator(this, 0); }
iterator end() { return iterator(this, fde_count_); }
DwarfErrorCode LastErrorCode() { return last_error_.code; }
uint64_t LastErrorAddress() { return last_error_.address; }
virtual bool Init(uint64_t offset, uint64_t size) = 0;
virtual bool Eval(const DwarfCie*, Memory*, const dwarf_loc_regs_t&, Regs*, bool*) = 0;
virtual bool GetFdeOffsetFromPc(uint64_t pc, uint64_t* fde_offset) = 0;
virtual bool Log(uint8_t indent, uint64_t pc, uint64_t load_bias, const DwarfFde* fde) = 0;
virtual const DwarfFde* GetFdeFromIndex(size_t index) = 0;
const DwarfFde* GetFdeFromPc(uint64_t pc);
virtual const DwarfFde* GetFdeFromOffset(uint64_t fde_offset) = 0;
virtual bool GetCfaLocationInfo(uint64_t pc, const DwarfFde* fde, dwarf_loc_regs_t* loc_regs) = 0;
virtual uint64_t GetCieOffsetFromFde32(uint32_t pointer) = 0;
virtual uint64_t GetCieOffsetFromFde64(uint64_t pointer) = 0;
virtual uint64_t AdjustPcFromFde(uint64_t pc) = 0;
bool Step(uint64_t pc, Regs* regs, Memory* process_memory, bool* finished);
protected:
DwarfMemory memory_;
DwarfErrorData last_error_{DWARF_ERROR_NONE, 0};
uint32_t cie32_value_ = 0;
uint64_t cie64_value_ = 0;
uint64_t fde_count_ = 0;
std::unordered_map<uint64_t, DwarfFde> fde_entries_;
std::unordered_map<uint64_t, DwarfCie> cie_entries_;
std::unordered_map<uint64_t, dwarf_loc_regs_t> cie_loc_regs_;
};
template <typename AddressType>
class DwarfSectionImpl : public DwarfSection {
public:
struct FdeInfo {
FdeInfo(uint64_t offset, uint64_t start, uint64_t length)
: offset(offset), start(start), end(start + length) {}
uint64_t offset;
AddressType start;
AddressType end;
};
DwarfSectionImpl(Memory* memory) : DwarfSection(memory) {}
virtual ~DwarfSectionImpl() = default;
bool Init(uint64_t offset, uint64_t size) override;
bool GetFdeOffsetFromPc(uint64_t pc, uint64_t* fde_offset) override;
const DwarfFde* GetFdeFromIndex(size_t index) override;
bool EvalRegister(const DwarfLocation* loc, uint32_t reg, AddressType* reg_ptr, void* info);
bool Eval(const DwarfCie* cie, Memory* regular_memory, const dwarf_loc_regs_t& loc_regs,
Regs* regs, bool* finished) override;
const DwarfCie* GetCie(uint64_t offset);
bool FillInCie(DwarfCie* cie);
const DwarfFde* GetFdeFromOffset(uint64_t offset) override;
bool FillInFde(DwarfFde* fde);
bool GetCfaLocationInfo(uint64_t pc, const DwarfFde* fde, dwarf_loc_regs_t* loc_regs) override;
bool Log(uint8_t indent, uint64_t pc, uint64_t load_bias, const DwarfFde* fde) override;
protected:
bool EvalExpression(const DwarfLocation& loc, Memory* regular_memory, AddressType* value,
RegsInfo<AddressType>* regs_info, bool* is_dex_pc);
bool GetCieInfo(uint8_t* segment_size, uint8_t* encoding);
bool AddFdeInfo(uint64_t entry_offset, uint8_t segment_size, uint8_t encoding);
bool CreateSortedFdeList();
std::vector<FdeInfo> fdes_;
uint64_t entries_offset_;
uint64_t entries_end_;
};
} // namespace unwindstack
#endif // _LIBUNWINDSTACK_DWARF_SECTION_H
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