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MC: Extract a derived class from ELFObjectWriter. NFCI.

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This class will be used to create regular, non-split ELF files.

Part of PR37466.

Differential Revision: https://reviews.llvm.org/D47049

llvm-svn: 332870
This commit is contained in:
Peter Collingbourne 2018-05-21 19:30:59 +00:00
parent ef313905f0
commit f0226e62a8
1 changed files with 19 additions and 13 deletions
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32
llvm/lib/MC/ELFObjectWriter.cpp
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@ -215,9 +215,6 @@ public:
};
class ELFObjectWriter : public MCObjectWriter {
raw_pwrite_stream &OS;
bool IsLittleEndian;
/// The target specific ELF writer instance.
std::unique_ptr<MCELFObjectTargetWriter> TargetObjectWriter;
@ -233,10 +230,8 @@ class ELFObjectWriter : public MCObjectWriter {
unsigned Type) const;
public:
ELFObjectWriter(std::unique_ptr<MCELFObjectTargetWriter> MOTW,
raw_pwrite_stream &OS, bool IsLittleEndian)
: OS(OS), IsLittleEndian(IsLittleEndian),
TargetObjectWriter(std::move(MOTW)) {}
ELFObjectWriter(std::unique_ptr<MCELFObjectTargetWriter> MOTW)
: TargetObjectWriter(std::move(MOTW)) {}
void reset() override {
Relocations.clear();
@ -253,16 +248,27 @@ public:
const MCFragment *Fragment, const MCFixup &Fixup,
MCValue Target, uint64_t &FixedValue) override;
uint64_t writeObject(MCAssembler &Asm, const MCAsmLayout &Layout) override {
return ELFWriter(*this, OS, IsLittleEndian).writeObject(Asm, Layout);
}
void executePostLayoutBinding(MCAssembler &Asm,
const MCAsmLayout &Layout) override;
friend struct ELFWriter;
};
class ELFSingleObjectWriter : public ELFObjectWriter {
raw_pwrite_stream &OS;
bool IsLittleEndian;
public:
ELFSingleObjectWriter(std::unique_ptr<MCELFObjectTargetWriter> MOTW,
raw_pwrite_stream &OS, bool IsLittleEndian)
: ELFObjectWriter(std::move(MOTW)), OS(OS),
IsLittleEndian(IsLittleEndian) {}
uint64_t writeObject(MCAssembler &Asm, const MCAsmLayout &Layout) override {
return ELFWriter(*this, OS, IsLittleEndian).writeObject(Asm, Layout);
}
};
} // end anonymous namespace
void ELFWriter::align(unsigned Alignment) {
@ -1374,6 +1380,6 @@ bool ELFObjectWriter::isSymbolRefDifferenceFullyResolvedImpl(
std::unique_ptr<MCObjectWriter>
llvm::createELFObjectWriter(std::unique_ptr<MCELFObjectTargetWriter> MOTW,
raw_pwrite_stream &OS, bool IsLittleEndian) {
return llvm::make_unique<ELFObjectWriter>(std::move(MOTW), OS,
IsLittleEndian);
return llvm::make_unique<ELFSingleObjectWriter>(std::move(MOTW), OS,
IsLittleEndian);
}