Add plumbing for the `linker_private' linkage type. This type is meant for

"private" symbols which the assember shouldn't strip, but which the linker may
remove after evaluation. This is mostly useful for Objective-C metadata.

This is plumbing, so we don't have a use of it yet. More to come, etc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76385 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 25 insertions, 23 deletions

diff --git a/lib/Bitcode/Reader/BitcodeReader.cpp b/lib/Bitcode/Reader/BitcodeReader.cpp
index e4d3c5e1ad..bc1eba01e2 100644
--- a/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -60,19 +60,20 @@ static bool ConvertToString(SmallVector<uint64_t, 64> &Record, unsigned Idx,
 static GlobalValue::LinkageTypes GetDecodedLinkage(unsigned Val) {
   switch (Val) {
   default: // Map unknown/new linkages to external
-  case 0: return GlobalValue::ExternalLinkage;
-  case 1: return GlobalValue::WeakAnyLinkage;
-  case 2: return GlobalValue::AppendingLinkage;
-  case 3: return GlobalValue::InternalLinkage;
-  case 4: return GlobalValue::LinkOnceAnyLinkage;
-  case 5: return GlobalValue::DLLImportLinkage;
-  case 6: return GlobalValue::DLLExportLinkage;
-  case 7: return GlobalValue::ExternalWeakLinkage;
-  case 8: return GlobalValue::CommonLinkage;
-  case 9: return GlobalValue::PrivateLinkage;
+  case 0:  return GlobalValue::ExternalLinkage;
+  case 1:  return GlobalValue::WeakAnyLinkage;
+  case 2:  return GlobalValue::AppendingLinkage;
+  case 3:  return GlobalValue::InternalLinkage;
+  case 4:  return GlobalValue::LinkOnceAnyLinkage;
+  case 5:  return GlobalValue::DLLImportLinkage;
+  case 6:  return GlobalValue::DLLExportLinkage;
+  case 7:  return GlobalValue::ExternalWeakLinkage;
+  case 8:  return GlobalValue::CommonLinkage;
+  case 9:  return GlobalValue::PrivateLinkage;
   case 10: return GlobalValue::WeakODRLinkage;
   case 11: return GlobalValue::LinkOnceODRLinkage;
   case 12: return GlobalValue::AvailableExternallyLinkage;
+  case 13: return GlobalValue::LinkerPrivateLinkage;
   }
 }
 
diff --git a/lib/Bitcode/Writer/BitcodeWriter.cpp b/lib/Bitcode/Writer/BitcodeWriter.cpp
index 55ec9e5e43..d7acd14a80 100644
--- a/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -281,19 +281,20 @@ static unsigned getEncodedLinkage(const GlobalValue *GV) {
   switch (GV->getLinkage()) {
   default: llvm_unreachable("Invalid linkage!");
   case GlobalValue::GhostLinkage:  // Map ghost linkage onto external.
-  case GlobalValue::ExternalLinkage:     return 0;
-  case GlobalValue::WeakAnyLinkage:      return 1;
-  case GlobalValue::AppendingLinkage:    return 2;
-  case GlobalValue::InternalLinkage:     return 3;
-  case GlobalValue::LinkOnceAnyLinkage:  return 4;
-  case GlobalValue::DLLImportLinkage:    return 5;
-  case GlobalValue::DLLExportLinkage:    return 6;
-  case GlobalValue::ExternalWeakLinkage: return 7;
-  case GlobalValue::CommonLinkage:       return 8;
-  case GlobalValue::PrivateLinkage:      return 9;
-  case GlobalValue::WeakODRLinkage:      return 10;
-  case GlobalValue::LinkOnceODRLinkage:  return 11;
-  case GlobalValue::AvailableExternallyLinkage:  return 12;
+  case GlobalValue::ExternalLinkage:            return 0;
+  case GlobalValue::WeakAnyLinkage:             return 1;
+  case GlobalValue::AppendingLinkage:           return 2;
+  case GlobalValue::InternalLinkage:            return 3;
+  case GlobalValue::LinkOnceAnyLinkage:         return 4;
+  case GlobalValue::DLLImportLinkage:           return 5;
+  case GlobalValue::DLLExportLinkage:           return 6;
+  case GlobalValue::ExternalWeakLinkage:        return 7;
+  case GlobalValue::CommonLinkage:              return 8;
+  case GlobalValue::PrivateLinkage:             return 9;
+  case GlobalValue::WeakODRLinkage:             return 10;
+  case GlobalValue::LinkOnceODRLinkage:         return 11;
+  case GlobalValue::AvailableExternallyLinkage: return 12;
+  case GlobalValue::LinkerPrivateLinkage:       return 13;
   }
 }