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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_DEBUG_ELF_READER_H_
#define BASE_DEBUG_ELF_READER_H_
#include <elf.h>
#include <optional>
#include <string_view>
#include "base/base_export.h"
#include "base/containers/span.h"
#include "base/hash/sha1.h"
// Functions for querying metadata from ELF binaries. All functions are signal
// safe and require that the file be fully memory mapped.
#if __SIZEOF_POINTER__ == 4
using Phdr = Elf32_Phdr;
#else
using Phdr = Elf64_Phdr;
#endif
namespace base {
namespace debug {
// Hex-encodes the build ID from the ELF binary located at |elf_mapped_base|.
// Returns the length of the build ID in bytes, or zero if the build ID couldn't
// be read.
// When |uppercase| is |true|, the output string is written using uppercase hex
// characters. Otherwise, the output is lowercased.
constexpr size_t kMaxBuildIdStringLength = kSHA1Length * 2;
using ElfBuildIdBuffer = char[kMaxBuildIdStringLength + 1];
size_t BASE_EXPORT ReadElfBuildId(const void* elf_mapped_base,
bool uppercase,
ElfBuildIdBuffer build_id);
// Returns the library name from the ELF file mapped at |elf_mapped_base|.
// Returns an empty result if the name could not be read.
std::optional<std::string_view> BASE_EXPORT
ReadElfLibraryName(const void* elf_mapped_base);
// Returns a span of ELF program headers for the ELF file mapped at
// |elf_mapped_base|, or an empty span if the header couldn't be read.
span<const Phdr> BASE_EXPORT GetElfProgramHeaders(const void* elf_mapped_base);
// Returns the offset to add to virtual addresses in the image to compute the
// mapped virtual address. This value must be added to the p_vaddr field in the
// Phdrs to obtain the mapped virtual address.
size_t BASE_EXPORT GetRelocationOffset(const void* elf_mapped_base);
} // namespace debug
} // namespace base
#endif // BASE_DEBUG_ELF_READER_H_
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