51 lines
1.7 KiB
C++
51 lines
1.7 KiB
C++
// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_DEBUG_ELF_READER_H_
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#define BASE_DEBUG_ELF_READER_H_
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#include <elf.h>
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#include "base/base_export.h"
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#include "base/containers/span.h"
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#include "base/hash/sha1.h"
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#include "base/optional.h"
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#include "base/strings/string_piece.h"
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// Functions for querying metadata from ELF binaries.
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// All functions require that the file be fully memory mapped.
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#if __SIZEOF_POINTER__ == 4
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using Phdr = Elf32_Phdr;
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#else
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using Phdr = Elf64_Phdr;
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#endif
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namespace base {
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namespace debug {
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// Hex-encodes the build ID from the ELF binary located at |elf_base|.
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// Returns the length of the build ID in bytes, or zero if the build ID couldn't
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// be read.
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// When |uppercase| is |true|, the output string is written using uppercase hex
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// characters. Otherwise, the output is lowercased.
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constexpr size_t kMaxBuildIdStringLength = kSHA1Length * 2;
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using ElfBuildIdBuffer = char[kMaxBuildIdStringLength + 1];
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size_t BASE_EXPORT ReadElfBuildId(const void* elf_base,
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bool uppercase,
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ElfBuildIdBuffer build_id);
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// Returns the library name from the ELF file mapped at |elf_base|.
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// Returns an empty result if the name could not be read.
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Optional<StringPiece> BASE_EXPORT ReadElfLibraryName(const void* elf_base);
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// Returns a span of ELF program headers for the ELF file mapped at
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// |elf_base|, or an empty span if the header couldn't be read.
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span<const Phdr> BASE_EXPORT GetElfProgramHeaders(const void* elf_base);
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} // namespace debug
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} // namespace base
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#endif // BASE_DEBUG_ELF_READER_H_
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