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Create SyntheticSections.cpp. 

We are going to have many more classes for linker-synthesized
input sections, so it's worth to be added to a separate file
than to the file for regular input sections.

llvm-svn: 285740
This commit is contained in:
Rui Ueyama 2016-11-01 20:28:21 +00:00
parent 4a2055bef9
commit 6dc7fcbec4
7 changed files with 202 additions and 145 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
lld/ELF/CMakeLists.txt
View File

@ -23,6 +23,7 @@ add_lld_library(lldELF
SymbolListFile.cpp
SymbolTable.cpp
Symbols.cpp
SyntheticSections.cpp
Target.cpp
Thunks.cpp
Writer.cpp

91
lld/ELF/InputSection.cpp
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@ -19,8 +19,6 @@
#include "llvm/Support/Compression.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/RandomNumberGenerator.h"
#include "llvm/Support/xxhash.h"
using namespace llvm;
using namespace llvm::ELF;
@ -852,65 +850,6 @@ InputSection<ELFT> InputSection<ELFT>::createCommonInputSection(
return Ret;
}
template <class ELFT>
BuildIdSection<ELFT>::BuildIdSection(size_t HashSize)
: InputSection<ELFT>(SHF_ALLOC, SHT_NOTE, 1, ArrayRef<uint8_t>(),
".note.gnu.build-id") {
Buf.resize(16 + HashSize);
const endianness E = ELFT::TargetEndianness;
write32<E>(Buf.data(), 4); // Name size
write32<E>(Buf.data() + 4, HashSize); // Content size
write32<E>(Buf.data() + 8, NT_GNU_BUILD_ID); // Type
memcpy(Buf.data() + 12, "GNU", 4); // Name string
this->Data = ArrayRef<uint8_t>(Buf);
}
template <class ELFT>
uint8_t *BuildIdSection<ELFT>::getOutputLoc(uint8_t *Start) const {
return Start + this->OutSec->getFileOffset() + this->OutSecOff;
}
template <class ELFT>
void BuildIdFastHash<ELFT>::writeBuildId(MutableArrayRef<uint8_t> Buf) {
const endianness E = ELFT::TargetEndianness;
// 64-bit xxhash
uint64_t Hash = xxHash64(toStringRef(Buf));
write64<E>(this->getOutputLoc(Buf.begin()) + 16, Hash);
}
template <class ELFT>
void BuildIdMd5<ELFT>::writeBuildId(MutableArrayRef<uint8_t> Buf) {
MD5 Hash;
Hash.update(Buf);
MD5::MD5Result Res;
Hash.final(Res);
memcpy(this->getOutputLoc(Buf.begin()) + 16, Res, 16);
}
template <class ELFT>
void BuildIdSha1<ELFT>::writeBuildId(MutableArrayRef<uint8_t> Buf) {
SHA1 Hash;
Hash.update(Buf);
memcpy(this->getOutputLoc(Buf.begin()) + 16, Hash.final().data(), 20);
}
template <class ELFT>
void BuildIdUuid<ELFT>::writeBuildId(MutableArrayRef<uint8_t> Buf) {
if (getRandomBytes(this->getOutputLoc(Buf.begin()) + 16, 16))
error("entropy source failure");
}
template <class ELFT>
BuildIdHexstring<ELFT>::BuildIdHexstring()
: BuildIdSection<ELFT>(Config->BuildIdVector.size()) {}
template <class ELFT>
void BuildIdHexstring<ELFT>::writeBuildId(MutableArrayRef<uint8_t> Buf) {
memcpy(this->getOutputLoc(Buf.begin()) + 16, Config->BuildIdVector.data(),
Config->BuildIdVector.size());
}
template class elf::InputSectionBase<ELF32LE>;
template class elf::InputSectionBase<ELF32BE>;
template class elf::InputSectionBase<ELF64LE>;
@ -945,33 +884,3 @@ template class elf::MipsAbiFlagsInputSection<ELF32LE>;
template class elf::MipsAbiFlagsInputSection<ELF32BE>;
template class elf::MipsAbiFlagsInputSection<ELF64LE>;
template class elf::MipsAbiFlagsInputSection<ELF64BE>;
template class elf::BuildIdSection<ELF32LE>;
template class elf::BuildIdSection<ELF32BE>;
template class elf::BuildIdSection<ELF64LE>;
template class elf::BuildIdSection<ELF64BE>;
template class elf::BuildIdFastHash<ELF32LE>;
template class elf::BuildIdFastHash<ELF32BE>;
template class elf::BuildIdFastHash<ELF64LE>;
template class elf::BuildIdFastHash<ELF64BE>;
template class elf::BuildIdMd5<ELF32LE>;
template class elf::BuildIdMd5<ELF32BE>;
template class elf::BuildIdMd5<ELF64LE>;
template class elf::BuildIdMd5<ELF64BE>;
template class elf::BuildIdSha1<ELF32LE>;
template class elf::BuildIdSha1<ELF32BE>;
template class elf::BuildIdSha1<ELF64LE>;
template class elf::BuildIdSha1<ELF64BE>;
template class elf::BuildIdUuid<ELF32LE>;
template class elf::BuildIdUuid<ELF32BE>;
template class elf::BuildIdUuid<ELF64LE>;
template class elf::BuildIdUuid<ELF64BE>;
template class elf::BuildIdHexstring<ELF32LE>;
template class elf::BuildIdHexstring<ELF32BE>;
template class elf::BuildIdHexstring<ELF64LE>;
template class elf::BuildIdHexstring<ELF64BE>;

52
lld/ELF/InputSection.h
View File

@ -339,58 +339,6 @@ public:
const llvm::object::Elf_Mips_ABIFlags<ELFT> *Flags = nullptr;
};
template <class ELFT> class BuildIdSection : public InputSection<ELFT> {
public:
virtual void writeBuildId(llvm::MutableArrayRef<uint8_t> Buf) = 0;
virtual ~BuildIdSection() = default;
uint8_t *getOutputLoc(uint8_t *Start) const;
protected:
BuildIdSection(size_t HashSize);
std::vector<uint8_t> Buf;
};
template <class ELFT>
class BuildIdFastHash final : public BuildIdSection<ELFT> {
public:
BuildIdFastHash() : BuildIdSection<ELFT>(8) {}
void writeBuildId(llvm::MutableArrayRef<uint8_t> Buf) override;
};
template <class ELFT> class BuildIdMd5 final : public BuildIdSection<ELFT> {
public:
BuildIdMd5() : BuildIdSection<ELFT>(16) {}
void writeBuildId(llvm::MutableArrayRef<uint8_t> Buf) override;
};
template <class ELFT> class BuildIdSha1 final : public BuildIdSection<ELFT> {
public:
BuildIdSha1() : BuildIdSection<ELFT>(20) {}
void writeBuildId(llvm::MutableArrayRef<uint8_t> Buf) override;
};
template <class ELFT> class BuildIdUuid final : public BuildIdSection<ELFT> {
public:
BuildIdUuid() : BuildIdSection<ELFT>(16) {}
void writeBuildId(llvm::MutableArrayRef<uint8_t> Buf) override;
};
template <class ELFT>
class BuildIdHexstring final : public BuildIdSection<ELFT> {
public:
BuildIdHexstring();
void writeBuildId(llvm::MutableArrayRef<uint8_t>) override;
};
// Linker generated sections which can be used as inputs.
template <class ELFT> struct In {
static BuildIdSection<ELFT> *BuildId;
static std::vector<InputSection<ELFT> *> Sections;
};
template <class ELFT> BuildIdSection<ELFT> *In<ELFT>::BuildId;
template <class ELFT> std::vector<InputSection<ELFT> *> In<ELFT>::Sections;
} // namespace elf
} // namespace lld

2
lld/ELF/OutputSections.h
View File

@ -18,8 +18,6 @@
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/MC/StringTableBuilder.h"
#include "llvm/Object/ELF.h"
#include "llvm/Support/MD5.h"
#include "llvm/Support/SHA1.h"
namespace lld {
namespace elf {

126
lld/ELF/SyntheticSections.cpp Normal file
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@ -0,0 +1,126 @@
//===- SyntheticSections.cpp ----------------------------------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains linker-synthesized sections. Currently,
// synthetic sections are created either output sections or input sections,
// but we are rewriting code so that all synthetic sections are created as
// input sections.
//
//===----------------------------------------------------------------------===//
#include "SyntheticSections.h"
#include "Config.h"
#include "Error.h"
#include "InputFiles.h"
#include "OutputSections.h"
#include "Strings.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/MD5.h"
#include "llvm/Support/RandomNumberGenerator.h"
#include "llvm/Support/SHA1.h"
#include "llvm/Support/xxhash.h"
using namespace llvm;
using namespace llvm::ELF;
using namespace llvm::object;
using namespace llvm::support;
using namespace llvm::support::endian;
using namespace lld;
using namespace lld::elf;
template <class ELFT>
BuildIdSection<ELFT>::BuildIdSection(size_t HashSize)
: InputSection<ELFT>(SHF_ALLOC, SHT_NOTE, 1, ArrayRef<uint8_t>(),
".note.gnu.build-id") {
Buf.resize(16 + HashSize);
const endianness E = ELFT::TargetEndianness;
write32<E>(Buf.data(), 4); // Name size
write32<E>(Buf.data() + 4, HashSize); // Content size
write32<E>(Buf.data() + 8, NT_GNU_BUILD_ID); // Type
memcpy(Buf.data() + 12, "GNU", 4); // Name string
this->Data = ArrayRef<uint8_t>(Buf);
}
template <class ELFT>
uint8_t *BuildIdSection<ELFT>::getOutputLoc(uint8_t *Start) const {
return Start + this->OutSec->getFileOffset() + this->OutSecOff;
}
template <class ELFT>
void BuildIdFastHash<ELFT>::writeBuildId(MutableArrayRef<uint8_t> Buf) {
const endianness E = ELFT::TargetEndianness;
// 64-bit xxhash
uint64_t Hash = xxHash64(toStringRef(Buf));
write64<E>(this->getOutputLoc(Buf.begin()) + 16, Hash);
}
template <class ELFT>
void BuildIdMd5<ELFT>::writeBuildId(MutableArrayRef<uint8_t> Buf) {
MD5 Hash;
Hash.update(Buf);
MD5::MD5Result Res;
Hash.final(Res);
memcpy(this->getOutputLoc(Buf.begin()) + 16, Res, 16);
}
template <class ELFT>
void BuildIdSha1<ELFT>::writeBuildId(MutableArrayRef<uint8_t> Buf) {
SHA1 Hash;
Hash.update(Buf);
memcpy(this->getOutputLoc(Buf.begin()) + 16, Hash.final().data(), 20);
}
template <class ELFT>
void BuildIdUuid<ELFT>::writeBuildId(MutableArrayRef<uint8_t> Buf) {
if (getRandomBytes(this->getOutputLoc(Buf.begin()) + 16, 16))
error("entropy source failure");
}
template <class ELFT>
BuildIdHexstring<ELFT>::BuildIdHexstring()
: BuildIdSection<ELFT>(Config->BuildIdVector.size()) {}
template <class ELFT>
void BuildIdHexstring<ELFT>::writeBuildId(MutableArrayRef<uint8_t> Buf) {
memcpy(this->getOutputLoc(Buf.begin()) + 16, Config->BuildIdVector.data(),
Config->BuildIdVector.size());
}
template class elf::BuildIdSection<ELF32LE>;
template class elf::BuildIdSection<ELF32BE>;
template class elf::BuildIdSection<ELF64LE>;
template class elf::BuildIdSection<ELF64BE>;
template class elf::BuildIdFastHash<ELF32LE>;
template class elf::BuildIdFastHash<ELF32BE>;
template class elf::BuildIdFastHash<ELF64LE>;
template class elf::BuildIdFastHash<ELF64BE>;
template class elf::BuildIdMd5<ELF32LE>;
template class elf::BuildIdMd5<ELF32BE>;
template class elf::BuildIdMd5<ELF64LE>;
template class elf::BuildIdMd5<ELF64BE>;
template class elf::BuildIdSha1<ELF32LE>;
template class elf::BuildIdSha1<ELF32BE>;
template class elf::BuildIdSha1<ELF64LE>;
template class elf::BuildIdSha1<ELF64BE>;
template class elf::BuildIdUuid<ELF32LE>;
template class elf::BuildIdUuid<ELF32BE>;
template class elf::BuildIdUuid<ELF64LE>;
template class elf::BuildIdUuid<ELF64BE>;
template class elf::BuildIdHexstring<ELF32LE>;
template class elf::BuildIdHexstring<ELF32BE>;
template class elf::BuildIdHexstring<ELF64LE>;
template class elf::BuildIdHexstring<ELF64BE>;

74
lld/ELF/SyntheticSections.h Normal file
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@ -0,0 +1,74 @@
//===- SyntheticSection.h ---------------------------------------*- C++ -*-===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLD_ELF_SYNTHETIC_SECTION_H
#define LLD_ELF_SYNTHETIC_SECTION_H
#include "InputSection.h"
namespace lld {
namespace elf {
template <class ELFT> class BuildIdSection : public InputSection<ELFT> {
public:
virtual void writeBuildId(llvm::MutableArrayRef<uint8_t> Buf) = 0;
virtual ~BuildIdSection() = default;
uint8_t *getOutputLoc(uint8_t *Start) const;
protected:
BuildIdSection(size_t HashSize);
std::vector<uint8_t> Buf;
};
template <class ELFT>
class BuildIdFastHash final : public BuildIdSection<ELFT> {
public:
BuildIdFastHash() : BuildIdSection<ELFT>(8) {}
void writeBuildId(llvm::MutableArrayRef<uint8_t> Buf) override;
};
template <class ELFT> class BuildIdMd5 final : public BuildIdSection<ELFT> {
public:
BuildIdMd5() : BuildIdSection<ELFT>(16) {}
void writeBuildId(llvm::MutableArrayRef<uint8_t> Buf) override;
};
template <class ELFT> class BuildIdSha1 final : public BuildIdSection<ELFT> {
public:
BuildIdSha1() : BuildIdSection<ELFT>(20) {}
void writeBuildId(llvm::MutableArrayRef<uint8_t> Buf) override;
};
template <class ELFT> class BuildIdUuid final : public BuildIdSection<ELFT> {
public:
BuildIdUuid() : BuildIdSection<ELFT>(16) {}
void writeBuildId(llvm::MutableArrayRef<uint8_t> Buf) override;
};
template <class ELFT>
class BuildIdHexstring final : public BuildIdSection<ELFT> {
public:
BuildIdHexstring();
void writeBuildId(llvm::MutableArrayRef<uint8_t>) override;
};
// Linker generated sections which can be used as inputs.
template <class ELFT> struct In {
static BuildIdSection<ELFT> *BuildId;
static std::vector<InputSection<ELFT> *> Sections;
};
template <class ELFT> BuildIdSection<ELFT> *In<ELFT>::BuildId;
template <class ELFT> std::vector<InputSection<ELFT> *> In<ELFT>::Sections;
} // namespace elf
} // namespace lld
#endif

1
lld/ELF/Writer.cpp
View File

@ -15,6 +15,7 @@
#include "Relocations.h"
#include "Strings.h"
#include "SymbolTable.h"
#include "SyntheticSections.h"
#include "Target.h"
#include "llvm/ADT/StringMap.h"