Add a variable to track whether or not we've used a unique section,

e.g. linkonce, to TargetMachine and set it when we've done so
for ELF targets currently. This involved making TargetMachine
non-const in a TLOF use and propagating that change around - I'm
open to other ideas.

This will be used in a future commit to handle emitting debug
information with ranges.

llvm-svn: 199871

1 files changed, 5 insertions, 3 deletions

diff --git a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
index 3621b582878..7f534acb70a 100644
--- a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -232,7 +232,7 @@ static const char *getSectionPrefixForGlobal(SectionKind Kind) {
 
 const MCSection *TargetLoweringObjectFileELF::
 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
-                       Mangler *Mang, const TargetMachine &TM) const {
+                       Mangler *Mang, TargetMachine &TM) const {
   // If we have -ffunction-section or -fdata-section then we should emit the
   // global value to a uniqued section specifically for it.
   bool EmitUniquedSection;
@@ -258,6 +258,8 @@ SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
       Flags |= ELF::SHF_GROUP;
     }
 
+    // Set that we've used a unique section name in the target machine.
+    TM.setDebugUseUniqueSections(true);
     return getContext().getELFSection(Name.str(),
                                       getELFSectionType(Name.str(), Kind),
                                       Flags, Kind, 0, Group);
@@ -529,7 +531,7 @@ getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
 
 const MCSection *TargetLoweringObjectFileMachO::
 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
-                       Mangler *Mang, const TargetMachine &TM) const {
+                       Mangler *Mang, TargetMachine &TM) const {
 
   // Handle thread local data.
   if (Kind.isThreadBSS()) return TLSBSSSection;
@@ -754,7 +756,7 @@ static const char *getCOFFSectionNameForUniqueGlobal(SectionKind Kind) {
 
 const MCSection *TargetLoweringObjectFileCOFF::
 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
-                       Mangler *Mang, const TargetMachine &TM) const {
+                       Mangler *Mang, TargetMachine &TM) const {
 
   // If this global is linkonce/weak and the target handles this by emitting it
   // into a 'uniqued' section name, create and return the section now.