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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#pragma once
#include "cmConfigure.h" // IWYU pragma: keep
#include <cstdint>
#include <iosfwd>
#include <memory>
#include <string>
#include <utility>
#include <vector>
class cmELFInternal;
/** \class cmELF
* \brief Executable and Link Format (ELF) parser.
*/
class cmELF
{
public:
/** Construct with the name of the ELF input file to parse. */
cmELF(const char* fname);
/** Destruct. */
~cmELF();
cmELF(const cmELF&) = delete;
cmELF& operator=(const cmELF&) = delete;
/** Get the error message if any. */
std::string const& GetErrorMessage() const { return this->ErrorMessage; }
/** Boolean conversion. True if the ELF file is valid. */
explicit operator bool() const { return this->Valid(); }
/** Enumeration of ELF file types. */
enum FileType
{
FileTypeInvalid,
FileTypeRelocatableObject,
FileTypeExecutable,
FileTypeSharedLibrary,
FileTypeCore,
FileTypeSpecificOS,
FileTypeSpecificProc
};
/** Represent string table entries. */
struct StringEntry
{
// The string value itself.
std::string Value;
// The position in the file at which the string appears.
unsigned long Position;
// The size of the string table entry. This includes the space
// allocated for one or more null terminators.
unsigned long Size;
// The index of the section entry referencing the string.
int IndexInSection;
};
/** Represent entire dynamic section header */
using DynamicEntryList = std::vector<std::pair<long, unsigned long>>;
/** Get the type of the file opened. */
FileType GetFileType() const;
/** Get the machine of the file opened. */
std::uint16_t GetMachine() const;
/** Get the number of ELF sections present. */
unsigned int GetNumberOfSections() const;
/** Get the position of a DYNAMIC section header entry. Returns
zero on error. */
unsigned long GetDynamicEntryPosition(int index) const;
/** Get a copy of all the DYNAMIC section header entries.
Returns an empty vector on error */
DynamicEntryList GetDynamicEntries() const;
/** Encodes a DYNAMIC section header entry list into a char vector according
to the type of ELF file this is */
std::vector<char> EncodeDynamicEntries(
const DynamicEntryList& entries) const;
/** Get the SONAME field if any. */
bool GetSOName(std::string& soname);
StringEntry const* GetSOName();
/** Get the RPATH field if any. */
StringEntry const* GetRPath();
/** Get the RUNPATH field if any. */
StringEntry const* GetRunPath();
/** Returns true if the ELF file targets a MIPS CPU. */
bool IsMIPS() const;
/** Print human-readable information about the ELF file. */
void PrintInfo(std::ostream& os) const;
/** Interesting dynamic tags.
If the tag is 0, it does not exist in the host ELF implementation */
static const long TagRPath, TagRunPath, TagMipsRldMapRel;
private:
friend class cmELFInternal;
bool Valid() const;
std::unique_ptr<cmELFInternal> Internal;
std::string ErrorMessage;
};
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