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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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20
lib/MC/MCContext.cpp
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@@ -272,12 +272,13 @@ void MCContext::renameELFSection(const MCSectionELF *Section, StringRef Name) {
const MCSectionELF *MCContext::getELFSection(StringRef Section, unsigned Type,
unsigned Flags, unsigned EntrySize,
StringRef Group) {
StringRef Group, bool Unique) {
// Do the lookup, if we have a hit, return it.
auto IterBool = ELFUniquingMap.insert(
std::make_pair(SectionGroupPair(Section, Group), nullptr));
auto &Entry = *IterBool.first;
if (!IterBool.second) return Entry.second;
if (!IterBool.second && !Unique)
return Entry.second;
MCSymbol *GroupSym = nullptr;
if (!Group.empty())
@@ -292,15 +293,22 @@ const MCSectionELF *MCContext::getELFSection(StringRef Section, unsigned Type,
Kind = SectionKind::getReadOnly();
MCSectionELF *Result = new (*this)
MCSectionELF(CachedName, Type, Flags, Kind, EntrySize, GroupSym);
Entry.second = Result;
MCSectionELF(CachedName, Type, Flags, Kind, EntrySize, GroupSym, Unique);
if (!Unique)
Entry.second = Result;
return Result;
}
const MCSectionELF *MCContext::getELFSection(StringRef Section, unsigned Type,
unsigned Flags, unsigned EntrySize,
StringRef Group) {
return getELFSection(Section, Type, Flags, EntrySize, Group, false);
}
const MCSectionELF *MCContext::CreateELFGroupSection() {
MCSectionELF *Result =
new (*this) MCSectionELF(".group", ELF::SHT_GROUP, 0,
SectionKind::getReadOnly(), 4, nullptr);
new (*this) MCSectionELF(".group", ELF::SHT_GROUP, 0,
SectionKind::getReadOnly(), 4, nullptr, false);
return Result;
}