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Add r228980 back.

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Add support for having multiple sections with the same name and comdat.

Using this in combination with -ffunction-sections allows LLVM to output a .o
file with mulitple sections named .text. This saves space by avoiding long
unique names of the form .text.<C++ mangled name>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229541 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2015-02-17 20:48:01 +00:00
parent 84f0507260
commit e0a2541eb7
10 changed files with 72 additions and 29 deletions
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31
lib/CodeGen/TargetLoweringObjectFileImpl.cpp
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@ -228,25 +228,25 @@ const MCSection *TargetLoweringObjectFileELF::getExplicitSectionGlobal(
/// DataSections.
static StringRef getSectionPrefixForGlobal(SectionKind Kind) {
if (Kind.isText())
return ".text.";
return ".text";
if (Kind.isReadOnly())
return ".rodata.";
return ".rodata";
if (Kind.isBSS())
return ".bss.";
return ".bss";
if (Kind.isThreadData())
return ".tdata.";
return ".tdata";
if (Kind.isThreadBSS())
return ".tbss.";
return ".tbss";
if (Kind.isDataNoRel())
return ".data.";
return ".data";
if (Kind.isDataRelLocal())
return ".data.rel.local.";
return ".data.rel.local";
if (Kind.isDataRel())
return ".data.rel.";
return ".data.rel";
if (Kind.isReadOnlyWithRelLocal())
return ".data.rel.ro.local.";
return ".data.rel.ro.local";
assert(Kind.isReadOnlyWithRel() && "Unknown section kind");
return ".data.rel.ro.";
return ".data.rel.ro";
}
const MCSection *TargetLoweringObjectFileELF::
@ -268,16 +268,19 @@ SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
StringRef Prefix = getSectionPrefixForGlobal(Kind);
SmallString<128> Name(Prefix);
TM.getNameWithPrefix(Name, GV, Mang, true);
bool UniqueSectionNames = TM.getUniqueSectionNames();
if (UniqueSectionNames) {
Name.push_back('.');
TM.getNameWithPrefix(Name, GV, Mang, true);
}
StringRef Group = "";
if (const Comdat *C = getELFComdat(GV)) {
Flags |= ELF::SHF_GROUP;
Group = C->getName();
}
return getContext().getELFSection(
Name.str(), getELFSectionType(Name.str(), Kind), Flags, 0, Group);
return getContext().getELFSection(Name, getELFSectionType(Name, Kind),
Flags, 0, Group, !UniqueSectionNames);
}
if (Kind.isText()) return TextSection;