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Completely rewrite ELFObjectWriter::RecordRelocation.

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I started trying to fix a small issue, but this code has seen a small fix too
many.

The old code was fairly convoluted. Some of the issues it had:

* It failed to check if a symbol difference was in the some section when
  converting a relocation to pcrel.
* It failed to check if the relocation was already pcrel.
* The pcrel value computation was wrong in some cases (relocation-pc.s)
* It was missing quiet a few cases where it should not convert symbol
  relocations to section relocations, leaving the backends to patch it up.
* It would not propagate the fact that it had changed a relocation to pcrel,
  requiring a quiet nasty work around in ARM.
* It was missing comments.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205076 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2014-03-29 06:26:49 +00:00
parent 44b2b9dc1a
commit 224dbf4aec
34 changed files with 353 additions and 697 deletions
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18
lib/Target/SystemZ/MCTargetDesc/SystemZMCObjectWriter.cpp
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@@ -26,9 +26,6 @@ protected:
// Override MCELFObjectTargetWriter.
unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
bool IsPCRel) const override;
const MCSymbol *ExplicitRelSym(const MCAssembler &Asm, const MCValue &Target,
const MCFragment &F, const MCFixup &Fixup,
bool IsPCRel) const override;
};
} // end anonymous namespace
@@ -111,21 +108,6 @@ unsigned SystemZObjectWriter::GetRelocType(const MCValue &Target,
}
}
const MCSymbol *SystemZObjectWriter::ExplicitRelSym(const MCAssembler &Asm,
const MCValue &Target,
const MCFragment &F,
const MCFixup &Fixup,
bool IsPCRel) const {
// The addend in a PC-relative R_390_* relocation is always applied to
// the PC-relative part of the address. If some kind of indirection
// is applied to the symbol first, we can't use an addend there too.
if (!Target.isAbsolute() &&
Target.getSymA()->getKind() != MCSymbolRefExpr::VK_None &&
IsPCRel)
return &Target.getSymA()->getSymbol().AliasedSymbol();
return NULL;
}
MCObjectWriter *llvm::createSystemZObjectWriter(raw_ostream &OS,
uint8_t OSABI) {
MCELFObjectTargetWriter *MOTW = new SystemZObjectWriter(OSABI);