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Layout helper function.

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Introduce a helper method to add a section to the end of a layout. This
will be used by the ELF ObjectWriter code to add the metadata sections
(symbol table, etc) to the end of an object file.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111171 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Fleming 2010-08-16 18:35:06 +00:00
parent 6c8b3d2f1f
commit a8bf473fb1
2 changed files with 36 additions and 0 deletions
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2
include/llvm/MC/MCAssembler.h
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@ -664,6 +664,8 @@ public:
void WriteSectionData(const MCSectionData *Section, const MCAsmLayout &Layout,
MCObjectWriter *OW) const;
void AddSectionToTheEnd(MCSectionData &SD, MCAsmLayout &Layout);
public:
/// Construct a new assembler instance.
///

34
lib/MC/MCAssembler.cpp
View File

@ -652,6 +652,40 @@ void MCAssembler::WriteSectionData(const MCSectionData *SD,
assert(OW->getStream().tell() - Start == Layout.getSectionFileSize(SD));
}
void MCAssembler::AddSectionToTheEnd(MCSectionData &SD, MCAsmLayout &Layout) {
// Create dummy fragments and assign section ordinals.
unsigned SectionIndex = 0;
for (MCAssembler::iterator it = begin(), ie = end(); it != ie; ++it)
SectionIndex++;
SD.setOrdinal(SectionIndex);
// Assign layout order indices to sections and fragments.
unsigned FragmentIndex = 0;
unsigned i = 0;
for (unsigned e = Layout.getSectionOrder().size(); i != e; ++i) {
MCSectionData *SD = Layout.getSectionOrder()[i];
for (MCSectionData::iterator it2 = SD->begin(),
ie2 = SD->end(); it2 != ie2; ++it2)
FragmentIndex++;
}
SD.setLayoutOrder(i);
for (MCSectionData::iterator it2 = SD.begin(),
ie2 = SD.end(); it2 != ie2; ++it2) {
it2->setLayoutOrder(FragmentIndex++);
}
Layout.getSectionOrder().push_back(&SD);
Layout.LayoutSection(&SD);
// Layout until everything fits.
while (LayoutOnce(Layout))
continue;
}
void MCAssembler::Finish(MCObjectWriter *Writer) {
DEBUG_WITH_TYPE("mc-dump", {
llvm::errs() << "assembler backend - pre-layout\n--\n";