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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// -*- mode: C++ -*-
//
// Copyright 2022 Google LLC
//
// Licensed under the Apache License v2.0 with LLVM Exceptions (the
// "License"); you may not use this file except in compliance with the
// License. You may obtain a copy of the License at
//
// https://llvm.org/LICENSE.txt
//
// 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.
//
// Author: Aleksei Vetrov
#ifndef STG_ELF_LOADER_H_
#define STG_ELF_LOADER_H_
#include <libelf.h>
#include <cstddef>
#include <cstdint>
#include <memory>
#include <ostream>
#include <string>
#include <string_view>
#include <vector>
#include "graph.h"
namespace stg {
namespace elf {
struct SymbolTableEntry {
enum class SymbolType {
NOTYPE = 0,
OBJECT,
FUNCTION,
SECTION,
FILE,
COMMON,
TLS,
GNU_IFUNC
};
enum class ValueType {
UNDEFINED = 0,
ABSOLUTE,
COMMON,
RELATIVE_TO_SECTION,
};
using Binding = ElfSymbol::Binding;
using Visibility = ElfSymbol::Visibility;
std::string_view name;
uint64_t value;
uint64_t size;
SymbolType symbol_type;
Binding binding;
Visibility visibility;
size_t section_index;
ValueType value_type;
};
std::ostream& operator<<(std::ostream& os, SymbolTableEntry::SymbolType type);
std::ostream& operator<<(std::ostream& os, SymbolTableEntry::ValueType type);
std::string_view UnwrapCFISymbolName(std::string_view cfi_name);
class ElfLoader final {
public:
explicit ElfLoader(Elf* elf, bool verbose = false);
std::string_view GetBtfRawData() const;
std::vector<SymbolTableEntry> GetElfSymbols() const;
std::vector<SymbolTableEntry> GetCFISymbols() const;
ElfSymbol::CRC GetElfSymbolCRC(const SymbolTableEntry& symbol) const;
std::string_view GetElfSymbolNamespace(const SymbolTableEntry& symbol) const;
size_t GetAbsoluteAddress(const SymbolTableEntry& symbol) const;
bool IsLinuxKernelBinary() const;
bool IsLittleEndianBinary() const;
private:
void InitializeElfInformation();
const bool verbose_;
Elf* elf_;
bool is_linux_kernel_binary_;
bool is_relocatable_;
bool is_little_endian_binary_;
};
} // namespace elf
} // namespace stg
#endif // STG_ELF_LOADER_H_
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