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add COFF support for COMDAT sections, patch by Nathan Jeffords!

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103304 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-05-07 21:49:09 +00:00
parent 9c00487dc3
commit 6e5ce287b0
5 changed files with 65 additions and 17 deletions
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20
lib/CodeGen/TargetLoweringObjectFileImpl.cpp
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@ -912,11 +912,17 @@ getCOFFSectionFlags(SectionKind K) {
unsigned Flags = 0;
if (!K.isMetadata())
Flags |= MCSectionCOFF::IMAGE_SCN_MEM_DISCARDABLE;
Flags |=
MCSectionCOFF::IMAGE_SCN_MEM_DISCARDABLE;
else if (K.isText())
Flags |=
MCSectionCOFF::IMAGE_SCN_MEM_EXECUTE |
MCSectionCOFF::IMAGE_SCN_CNT_CODE;
else if (K.isBSS ())
Flags |=
MCSectionCOFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
MCSectionCOFF::IMAGE_SCN_MEM_READ |
MCSectionCOFF::IMAGE_SCN_MEM_WRITE;
else if (K.isReadOnly())
Flags |=
MCSectionCOFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
@ -941,6 +947,8 @@ getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
static const char *getCOFFSectionPrefixForUniqueGlobal(SectionKind Kind) {
if (Kind.isText())
return ".text$linkonce";
if (Kind.isBSS ())
return ".bss$linkonce";
if (Kind.isWriteable())
return ".data$linkonce";
return ".rdata$linkonce";
@ -959,9 +967,13 @@ SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
SmallString<128> Name(Prefix, Prefix+strlen(Prefix));
MCSymbol *Sym = Mang->getSymbol(GV);
Name.append(Sym->getName().begin(), Sym->getName().end());
return getContext().getCOFFSection(Name.str(),
getCOFFSectionFlags(Kind),
Kind);
unsigned Characteristics = getCOFFSectionFlags(Kind);
Characteristics |= MCSectionCOFF::IMAGE_SCN_LNK_COMDAT;
return getContext().getCOFFSection(Name.str(), Characteristics,
MCSectionCOFF::IMAGE_COMDAT_SELECT_EXACT_MATCH, Kind);
}
if (Kind.isText())