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Invalidate the layout on any relaxation, not just Instructions. Bug found by David Meyer.

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While here, remove unused argument and rename UpdateForSlide to Invalidate.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120009 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2010-11-23 08:08:33 +00:00
parent d93ceeb125
commit a9d4281cc0
2 changed files with 14 additions and 13 deletions
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7
include/llvm/MC/MCAsmLayout.h
View File

@ -54,10 +54,9 @@ public:
/// Get the assembler object this is a layout for.
MCAssembler &getAssembler() const { return Assembler; }
/// \brief Update the layout because a fragment has been resized. The
/// fragments size should have already been updated, the \arg SlideAmount is
/// the delta from the old size.
void UpdateForSlide(MCFragment *F, int SlideAmount);
/// \brief Invalidate all following fragments because a fragment has been resized. The
/// fragments size should have already been updated.
void Invalidate(MCFragment *F);
/// \brief Update the layout, replacing Src with Dst. The contents
/// of Src and Dst are not modified, and must be copied by the caller.

20
lib/MC/MCAssembler.cpp
View File

@ -78,7 +78,7 @@ bool MCAsmLayout::isFragmentUpToDate(const MCFragment *F) const {
F->getLayoutOrder() <= LastValidFragment->getLayoutOrder());
}
void MCAsmLayout::UpdateForSlide(MCFragment *F, int SlideAmount) {
void MCAsmLayout::Invalidate(MCFragment *F) {
// If this fragment wasn't already up-to-date, we don't need to do anything.
if (!isFragmentUpToDate(F))
return;
@ -143,7 +143,7 @@ void MCAsmLayout::CoalesceFragments(MCFragment *Src, MCFragment *Dst) {
Dst->EffectiveSize += Src->EffectiveSize;
} else {
// We don't know the effective size of Src, so we have to invalidate Dst.
UpdateForSlide(Dst, 0);
Invalidate(Dst);
}
// Remove Src, but don't delete it yet.
Src->getParent()->getFragmentList().remove(Src);
@ -819,7 +819,6 @@ bool MCAssembler::RelaxInstruction(const MCObjectWriter &Writer,
VecOS.flush();
// Update the instruction fragment.
int SlideAmount = Code.size() - IF.getInstSize();
IF.setInst(Relaxed);
IF.getCode() = Code;
IF.getFixups().clear();
@ -827,8 +826,6 @@ bool MCAssembler::RelaxInstruction(const MCObjectWriter &Writer,
for (unsigned i = 0, e = Fixups.size(); i != e; ++i)
IF.getFixups().push_back(Fixups[i]);
// Update the layout, and remember that we relaxed.
Layout.UpdateForSlide(&IF, SlideAmount);
return true;
}
@ -894,24 +891,29 @@ bool MCAssembler::LayoutOnce(const MCObjectWriter &Writer,
for (MCSectionData::iterator it2 = SD.begin(),
ie2 = SD.end(); it2 != ie2; ++it2) {
// Check if this is an fragment that needs relaxation.
bool relaxedFrag = false;
switch(it2->getKind()) {
default:
break;
case MCFragment::FT_Inst:
WasRelaxed |= RelaxInstruction(Writer, Layout,
relaxedFrag = RelaxInstruction(Writer, Layout,
*cast<MCInstFragment>(it2));
break;
case MCFragment::FT_Org:
WasRelaxed |= RelaxOrg(Writer, Layout, *cast<MCOrgFragment>(it2));
relaxedFrag = RelaxOrg(Writer, Layout, *cast<MCOrgFragment>(it2));
break;
case MCFragment::FT_Dwarf:
WasRelaxed |= RelaxDwarfLineAddr(Writer, Layout,
relaxedFrag = RelaxDwarfLineAddr(Writer, Layout,
*cast<MCDwarfLineAddrFragment>(it2));
break;
case MCFragment::FT_LEB:
WasRelaxed |= RelaxLEB(Writer, Layout, *cast<MCLEBFragment>(it2));
relaxedFrag = RelaxLEB(Writer, Layout, *cast<MCLEBFragment>(it2));
break;
}
// Update the layout, and remember that we relaxed.
if (relaxedFrag)
Layout.Invalidate(it2);
WasRelaxed |= relaxedFrag;
}
}