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Put jump tables in distinct sections if -ffunction-sections is used.

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A small regression in r230411 was that we were basing the decision on
-fdata-sections.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230707 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2015-02-26 23:55:11 +00:00
parent e508109037
commit fc0ad8d28d
2 changed files with 34 additions and 20 deletions
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48
lib/CodeGen/TargetLoweringObjectFileImpl.cpp
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@@ -244,22 +244,9 @@ static StringRef getSectionPrefixForGlobal(SectionKind Kind) {
return ".data.rel.ro";
}
const MCSection *TargetLoweringObjectFileELF::
SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler &Mang, const TargetMachine &TM) const {
unsigned Flags = getELFSectionFlags(Kind);
// If we have -ffunction-section or -fdata-section then we should emit the
// global value to a uniqued section specifically for it.
bool EmitUniqueSection = false;
if (!(Flags & ELF::SHF_MERGE) && !Kind.isCommon()) {
if (Kind.isText())
EmitUniqueSection = TM.getFunctionSections();
else
EmitUniqueSection = TM.getDataSections();
}
EmitUniqueSection |= GV->hasComdat();
static const MCSectionELF *selectELFSectionForGlobal(
MCContext &Ctx, const GlobalValue *GV, SectionKind Kind, Mangler &Mang,
const TargetMachine &TM, bool EmitUniqueSection, unsigned Flags) {
unsigned EntrySize = 0;
if (Kind.isMergeableCString()) {
if (Kind.isMergeable2ByteCString()) {
@@ -309,9 +296,29 @@ SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
Name.push_back('.');
TM.getNameWithPrefix(Name, GV, Mang, true);
}
return getContext().getELFSection(Name, getELFSectionType(Name, Kind), Flags,
EntrySize, Group,
EmitUniqueSection && !UniqueSectionNames);
return Ctx.getELFSection(Name, getELFSectionType(Name, Kind), Flags,
EntrySize, Group,
EmitUniqueSection && !UniqueSectionNames);
}
const MCSection *TargetLoweringObjectFileELF::SelectSectionForGlobal(
const GlobalValue *GV, SectionKind Kind, Mangler &Mang,
const TargetMachine &TM) const {
unsigned Flags = getELFSectionFlags(Kind);
// If we have -ffunction-section or -fdata-section then we should emit the
// global value to a uniqued section specifically for it.
bool EmitUniqueSection = false;
if (!(Flags & ELF::SHF_MERGE) && !Kind.isCommon()) {
if (Kind.isText())
EmitUniqueSection = TM.getFunctionSections();
else
EmitUniqueSection = TM.getDataSections();
}
EmitUniqueSection |= GV->hasComdat();
return selectELFSectionForGlobal(getContext(), GV, Kind, Mang, TM,
EmitUniqueSection, Flags);
}
const MCSection *TargetLoweringObjectFileELF::getSectionForJumpTable(
@@ -323,7 +330,8 @@ const MCSection *TargetLoweringObjectFileELF::getSectionForJumpTable(
if (!EmitUniqueSection)
return ReadOnlySection;
return SelectSectionForGlobal(&F, SectionKind::getReadOnly(), Mang, TM);
return selectELFSectionForGlobal(getContext(), &F, SectionKind::getReadOnly(),
Mang, TM, EmitUniqueSection, ELF::SHF_ALLOC);
}
bool TargetLoweringObjectFileELF::shouldPutJumpTableInFunctionSection(