Add support for aliases with linkonce_odr.

This will be used to extend constructor aliases in clang.

llvm-svn: 192066

3 files changed, 10 insertions, 11 deletions

diff --git a/llvm/lib/AsmParser/LLParser.cpp b/llvm/lib/AsmParser/LLParser.cpp
index bdc79068946..d5c5db11de8 100644
--- a/llvm/lib/AsmParser/LLParser.cpp
+++ b/llvm/lib/AsmParser/LLParser.cpp
@@ -627,18 +627,17 @@ bool LLParser::ParseAlias(const std::string &Name, LocTy NameLoc,
                           unsigned Visibility) {
   assert(Lex.getKind() == lltok::kw_alias);
   Lex.Lex();
-  unsigned Linkage;
   LocTy LinkageLoc = Lex.getLoc();
-  if (ParseOptionalLinkage(Linkage))
+  unsigned L;
+  if (ParseOptionalLinkage(L))
     return true;
 
-  if (Linkage != GlobalValue::ExternalLinkage &&
-      Linkage != GlobalValue::WeakAnyLinkage &&
-      Linkage != GlobalValue::WeakODRLinkage &&
-      Linkage != GlobalValue::InternalLinkage &&
-      Linkage != GlobalValue::PrivateLinkage &&
-      Linkage != GlobalValue::LinkerPrivateLinkage &&
-      Linkage != GlobalValue::LinkerPrivateWeakLinkage)
+  GlobalValue::LinkageTypes Linkage = (GlobalValue::LinkageTypes) L;
+
+  if(!GlobalValue::isExternalLinkage(Linkage) &&
+     !GlobalValue::isLocalLinkage(Linkage) &&
+     !GlobalValue::isWeakLinkage(Linkage) &&
+     !GlobalValue::isLinkOnceLinkage(Linkage))
     return Error(LinkageLoc, "invalid linkage type for alias");
 
   Constant *Aliasee;
diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index dae305b0b4c..4b5edec4c6f 100644
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -934,7 +934,7 @@ bool AsmPrinter::doFinalization(Module &M) {
 
       if (I->hasExternalLinkage() || !MAI->getWeakRefDirective())
         OutStreamer.EmitSymbolAttribute(Name, MCSA_Global);
-      else if (I->hasWeakLinkage())
+      else if (I->hasWeakLinkage() || I->hasLinkOnceLinkage())
         OutStreamer.EmitSymbolAttribute(Name, MCSA_WeakReference);
       else
         assert(I->hasLocalLinkage() && "Invalid alias linkage");
diff --git a/llvm/lib/IR/Verifier.cpp b/llvm/lib/IR/Verifier.cpp
index b6d148b377c..c0108392354 100644
--- a/llvm/lib/IR/Verifier.cpp
+++ b/llvm/lib/IR/Verifier.cpp
@@ -530,7 +530,7 @@ void Verifier::visitGlobalAlias(GlobalAlias &GA) {
   Assert1(!GA.getName().empty(),
           "Alias name cannot be empty!", &GA);
   Assert1(GA.hasExternalLinkage() || GA.hasLocalLinkage() ||
-          GA.hasWeakLinkage(),
+          GA.hasWeakLinkage() || GA.hasLinkOnceLinkage(),
           "Alias should have external or external weak linkage!", &GA);
   Assert1(GA.getAliasee(),
           "Aliasee cannot be NULL!", &GA);