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Implement unique sections with an unique ID.

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This allows the compiler/assembly programmer to switch back to a
section. This in turn fixes the bootstrap failure on powerpc (tested
on gcc110) without changing the ppc codegen at all.

I will try to cleanup the various getELFSection overloads in a  followup patch.
Just using a default argument now would lead to ambiguities.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234099 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2015-04-04 18:02:01 +00:00
parent ffcb79bea1
commit 903f4a2051
18 changed files with 103 additions and 50 deletions
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21
lib/CodeGen/TargetLoweringObjectFileImpl.cpp
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@ -245,9 +245,11 @@ static StringRef getSectionPrefixForGlobal(SectionKind Kind) {
return ".data.rel.ro";
}
static const MCSectionELF *selectELFSectionForGlobal(
MCContext &Ctx, const GlobalValue *GV, SectionKind Kind, Mangler &Mang,
const TargetMachine &TM, bool EmitUniqueSection, unsigned Flags) {
static const MCSectionELF *
selectELFSectionForGlobal(MCContext &Ctx, const GlobalValue *GV,
SectionKind Kind, Mangler &Mang,
const TargetMachine &TM, bool EmitUniqueSection,
unsigned Flags, unsigned *NextUniqueID) {
unsigned EntrySize = 0;
if (Kind.isMergeableCString()) {
if (Kind.isMergeable2ByteCString()) {
@ -297,9 +299,13 @@ static const MCSectionELF *selectELFSectionForGlobal(
Name.push_back('.');
TM.getNameWithPrefix(Name, GV, Mang, true);
}
unsigned UniqueID = ~0;
if (EmitUniqueSection && !UniqueSectionNames) {
UniqueID = *NextUniqueID;
(*NextUniqueID)++;
}
return Ctx.getELFSection(Name, getELFSectionType(Name, Kind), Flags,
EntrySize, Group,
EmitUniqueSection && !UniqueSectionNames);
EntrySize, Group, UniqueID);
}
const MCSection *TargetLoweringObjectFileELF::SelectSectionForGlobal(
@ -319,7 +325,7 @@ const MCSection *TargetLoweringObjectFileELF::SelectSectionForGlobal(
EmitUniqueSection |= GV->hasComdat();
return selectELFSectionForGlobal(getContext(), GV, Kind, Mang, TM,
EmitUniqueSection, Flags);
EmitUniqueSection, Flags, &NextUniqueID);
}
const MCSection *TargetLoweringObjectFileELF::getSectionForJumpTable(
@ -332,7 +338,8 @@ const MCSection *TargetLoweringObjectFileELF::getSectionForJumpTable(
return ReadOnlySection;
return selectELFSectionForGlobal(getContext(), &F, SectionKind::getReadOnly(),
Mang, TM, EmitUniqueSection, ELF::SHF_ALLOC);
Mang, TM, EmitUniqueSection, ELF::SHF_ALLOC,
&NextUniqueID);
}
bool TargetLoweringObjectFileELF::shouldPutJumpTableInFunctionSection(