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On MachO, don't put non-private constants in mergeable sections.

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On MachO, putting a symbol that doesn't start with a 'L' or 'l' in one of the
__TEXT,__literal* sections prevents the linker from merging the context of the
section.

Since private GVs are the ones the get mangled to start with 'L' or 'l', we now
only put those on the __TEXT,__literal* sections.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216682 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2014-08-28 20:13:31 +00:00
parent 8317095e97
commit 4bb535027e
2 changed files with 27 additions and 6 deletions
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4
lib/CodeGen/TargetLoweringObjectFileImpl.cpp
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@ -626,7 +626,9 @@ SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
cast<GlobalVariable>(GV)) < 32)
return UStringSection;
if (Kind.isMergeableConst()) {
// With MachO only variables whose corresponding symbol starts with 'l' or
// 'L' can be merged, so we only try merging GVs with private linkage.
if (GV->hasPrivateLinkage() && Kind.isMergeableConst()) {
if (Kind.isMergeableConst4())
return FourByteConstantSection;
if (Kind.isMergeableConst8())