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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.
*/
#pragma once
#include <stdint.h>
#include <map>
#include <optional>
#include <string>
#include <unordered_map>
#include <unwindstack/SharedString.h>
namespace unwindstack {
// Forward declaration.
class Memory;
class Symbols {
struct Info {
uint32_t size; // Symbol size in bytes.
uint32_t index; // Index into *sorted* symbol table.
SharedString name;
};
public:
Symbols(uint64_t offset, uint64_t size, uint64_t entry_size, uint64_t str_offset,
uint64_t str_size);
virtual ~Symbols() = default;
template <typename SymType>
bool GetName(uint64_t addr, Memory* elf_memory, SharedString* name, uint64_t* func_offset);
template <typename SymType>
bool GetGlobal(Memory* elf_memory, const std::string& name, uint64_t* memory_address);
void ClearCache() {
symbols_.clear();
remap_.reset();
}
private:
template <typename SymType, bool RemapIndices>
Info* BinarySearch(uint64_t addr, Memory* elf_memory, uint64_t* func_offset);
template <typename SymType>
void BuildRemapTable(Memory* elf_memory);
const uint64_t offset_;
const uint64_t count_;
const uint64_t entry_size_;
const uint64_t str_offset_;
uint64_t str_end_;
std::map<uint64_t, Info> symbols_; // Cache of read symbols (keyed by function *end* address).
std::optional<std::vector<uint32_t>> remap_; // Indices of function symbols sorted by address.
// Cache of global data (non-function) symbols.
std::unordered_map<std::string, std::optional<uint64_t>> global_variables_;
// Do not allow the total number of symbols to go above this.
constexpr static size_t kMaxSymbols = 1000000;
};
} // namespace unwindstack
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