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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_EH_FRAME_H
#define _LIBUNWINDSTACK_DWARF_EH_FRAME_H
#include <stdint.h>
#include <unwindstack/DwarfSection.h>
namespace unwindstack {
// Forward declarations.
class Memory;
template <typename AddressType>
class DwarfEhFrame : public DwarfSectionImpl<AddressType> {
public:
// Add these so that the protected members of DwarfSectionImpl
// can be accessed without needing a this->.
using DwarfSectionImpl<AddressType>::memory_;
using DwarfSectionImpl<AddressType>::fde_count_;
using DwarfSectionImpl<AddressType>::last_error_;
struct FdeInfo {
AddressType pc;
uint64_t offset;
};
DwarfEhFrame(Memory* memory) : DwarfSectionImpl<AddressType>(memory) {}
virtual ~DwarfEhFrame() = 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 IsCie32(uint32_t value32) override { return value32 == 0; }
bool IsCie64(uint64_t value64) override { return value64 == 0; }
uint64_t GetCieOffsetFromFde32(uint32_t pointer) override {
return memory_.cur_offset() - pointer - 4;
}
uint64_t GetCieOffsetFromFde64(uint64_t pointer) override {
return memory_.cur_offset() - pointer - 8;
}
uint64_t AdjustPcFromFde(uint64_t pc) override {
// The eh_frame uses relative pcs.
return pc + memory_.cur_offset();
}
const FdeInfo* GetFdeInfoFromIndex(size_t index);
bool GetFdeOffsetSequential(uint64_t pc, uint64_t* fde_offset);
bool GetFdeOffsetBinary(uint64_t pc, uint64_t* fde_offset, uint64_t total_entries);
protected:
uint8_t version_;
uint8_t ptr_encoding_;
uint8_t table_encoding_;
size_t table_entry_size_;
uint64_t ptr_offset_;
uint64_t entries_offset_;
uint64_t entries_end_;
uint64_t entries_data_offset_;
uint64_t cur_entries_offset_ = 0;
std::unordered_map<uint64_t, FdeInfo> fde_info_;
};
} // namespace unwindstack
#endif // _LIBUNWINDSTACK_DWARF_EH_FRAME_H
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