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Don' try to make sections in comdats SHF_MERGE.

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Parts of llvm were not expecting it and we wouldn't print
the entity size of the section.

Given what comdats are used for, having SHF_MERGE sections would be
just a small improvement, so just disable it for now.

Fixes pr22463.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228196 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2015-02-04 21:27:24 +00:00
parent 54a6137379
commit e247dd2839
2 changed files with 12 additions and 4 deletions
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8
lib/CodeGen/TargetLoweringObjectFileImpl.cpp
View File

@ -166,7 +166,7 @@ static unsigned getELFSectionType(StringRef Name, SectionKind K) {
static unsigned
getELFSectionFlags(SectionKind K) {
getELFSectionFlags(SectionKind K, bool InCOMDAT) {
unsigned Flags = 0;
if (!K.isMetadata())
@ -181,7 +181,7 @@ getELFSectionFlags(SectionKind K) {
if (K.isThreadLocal())
Flags |= ELF::SHF_TLS;
if (K.isMergeableCString() || K.isMergeableConst())
if (!InCOMDAT && (K.isMergeableCString() || K.isMergeableConst()))
Flags |= ELF::SHF_MERGE;
if (K.isMergeableCString())
@ -211,7 +211,7 @@ const MCSection *TargetLoweringObjectFileELF::getExplicitSectionGlobal(
Kind = getELFKindForNamedSection(SectionName, Kind);
StringRef Group = "";
unsigned Flags = getELFSectionFlags(Kind);
unsigned Flags = getELFSectionFlags(Kind, GV->hasComdat());
if (const Comdat *C = getELFComdat(GV)) {
Group = C->getName();
Flags |= ELF::SHF_GROUP;
@ -243,7 +243,7 @@ static StringRef getSectionPrefixForGlobal(SectionKind Kind) {
const MCSection *TargetLoweringObjectFileELF::
SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler &Mang, const TargetMachine &TM) const {
unsigned Flags = getELFSectionFlags(Kind);
unsigned Flags = getELFSectionFlags(Kind, GV->hasComdat());
// If we have -ffunction-section or -fdata-section then we should emit the
// global value to a uniqued section specifically for it.

8
test/CodeGen/X86/global-sections-comdat.ll Normal file
View File

@ -0,0 +1,8 @@
; RUN: llc < %s -mtriple=i386-unknown-linux | FileCheck %s -check-prefix=LINUX
; RUN: llc < %s -mtriple=i386-unknown-linux -data-sections | FileCheck %s -check-prefix=LINUX-SECTIONS
$G16 = comdat any
@G16 = unnamed_addr constant i32 42, comdat
; LINUX: .section .rodata.G16,"aG",@progbits,G16,comdat
; LINUX-SECTIONS: .section .rodata.G16,"aG",@progbits,G16,comdat