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Add support for subsections to the ELF assembler. Fixes PR8717.

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Differential Revision: http://llvm-reviews.chandlerc.com/D598

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179725 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Peter Collingbourne
2013-04-17 21:18:16 +00:00
parent 53c9def433
commit df39be6cb4
30 changed files with 288 additions and 118 deletions
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33
lib/MC/MCAssembler.cpp
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@@ -214,7 +214,8 @@ MCFragment::~MCFragment() {
MCFragment::MCFragment(FragmentType _Kind, MCSectionData *_Parent)
: Kind(_Kind), Parent(_Parent), Atom(0), Offset(~UINT64_C(0))
{
Parent->getFragmentList().push_back(this);
if (Parent)
Parent->getFragmentList().push_back(this);
}
/* *** */
@@ -242,6 +243,36 @@ MCSectionData::MCSectionData(const MCSection &_Section, MCAssembler *A)
A->getSectionList().push_back(this);
}
MCSectionData::iterator
MCSectionData::getSubsectionInsertionPoint(unsigned Subsection) {
if (Subsection == 0 && SubsectionFragmentMap.empty())
return end();
SmallVectorImpl<std::pair<unsigned, MCFragment *> >::iterator MI =
std::lower_bound(SubsectionFragmentMap.begin(), SubsectionFragmentMap.end(),
std::make_pair(Subsection, (MCFragment *)0));
bool ExactMatch = false;
if (MI != SubsectionFragmentMap.end()) {
ExactMatch = MI->first == Subsection;
if (ExactMatch)
++MI;
}
iterator IP;
if (MI == SubsectionFragmentMap.end())
IP = end();
else
IP = MI->second;
if (!ExactMatch && Subsection != 0) {
// The GNU as documentation claims that subsections have an alignment of 4,
// although this appears not to be the case.
MCFragment *F = new MCDataFragment();
SubsectionFragmentMap.insert(MI, std::make_pair(Subsection, F));
getFragmentList().insert(IP, F);
F->setParent(this);
}
return IP;
}
/* *** */
MCSymbolData::MCSymbolData() : Symbol(0) {}