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MC Win64: Put unwind info for COMDAT code into the same COMDAT group

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Summary:
This fixes a long standing issue where we would emit many little .text
sections and only one .pdata and .xdata section. Now we generate one
.pdata / .xdata pair per .text section and associate them correctly.

Fixes PR19667.

Reviewers: majnemer

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D5181

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217176 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner
2014-09-04 17:42:03 +00:00
parent 54dfc533fc
commit b9cb76d3f3
8 changed files with 162 additions and 49 deletions
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23
lib/CodeGen/TargetLoweringObjectFileImpl.cpp
View File

@@ -967,29 +967,14 @@ emitModuleFlags(MCStreamer &Streamer,
}
}
static const MCSection *getAssociativeCOFFSection(MCContext &Ctx,
const MCSection *Sec,
const MCSymbol *KeySym) {
// Return the normal section if we don't have to be associative.
if (!KeySym)
return Sec;
// Make an associative section with the same name and kind as the normal
// section.
const MCSectionCOFF *SecCOFF = cast<MCSectionCOFF>(Sec);
unsigned Characteristics =
SecCOFF->getCharacteristics() | COFF::IMAGE_SCN_LNK_COMDAT;
return Ctx.getCOFFSection(SecCOFF->getSectionName(), Characteristics,
SecCOFF->getKind(), KeySym->getName(),
COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE);
}
const MCSection *TargetLoweringObjectFileCOFF::getStaticCtorSection(
unsigned Priority, const MCSymbol *KeySym) const {
return getAssociativeCOFFSection(getContext(), StaticCtorSection, KeySym);
return getContext().getAssociativeCOFFSection(
cast<MCSectionCOFF>(StaticCtorSection), KeySym);
}
const MCSection *TargetLoweringObjectFileCOFF::getStaticDtorSection(
unsigned Priority, const MCSymbol *KeySym) const {
return getAssociativeCOFFSection(getContext(), StaticDtorSection, KeySym);
return getContext().getAssociativeCOFFSection(
cast<MCSectionCOFF>(StaticDtorSection), KeySym);
}