Do not create a replaceable Variables MDNode for function forward decls.

These fields would need to be explicitly deleted before we RAUW the temporary
node anyway (this was done in cfe commit r222373). Instead, do not create
these useless nodes in the first place.

llvm-svn: 222434

diff --git a/llvm/lib/IR/DIBuilder.cpp b/llvm/lib/IR/DIBuilder.cpp
index 204817f..4fe2be6 100644 (file)
--- a/llvm/lib/IR/DIBuilder.cpp
+++ b/llvm/lib/IR/DIBuilder.cpp
@@ -937,11 +937,10 @@ createFunctionHelper(LLVMContext &VMContext, DIDescriptor Context, StringRef Nam
                      StringRef LinkageName, DIFile File, unsigned LineNo,
                      DICompositeType Ty, bool isLocalToUnit, bool isDefinition,
                      unsigned ScopeLine, unsigned Flags, bool isOptimized,
-                     Function *Fn, MDNode *TParams, MDNode *Decl,
+                     Function *Fn, MDNode *TParams, MDNode *Decl, MDNode *Vars,
                      std::function<MDNode *(ArrayRef<Value *>)> CreateFunc) {
   assert(Ty.getTag() == dwarf::DW_TAG_subroutine_type &&
          "function types should be subroutines");
-  Value *TElts[] = {HeaderBuilder::get(DW_TAG_base_type).get(VMContext)};
   Value *Elts[] = {
       HeaderBuilder::get(dwarf::DW_TAG_subprogram)
           .concat(Name)
@@ -957,7 +956,7 @@ createFunctionHelper(LLVMContext &VMContext, DIDescriptor Context, StringRef Nam
           .concat(ScopeLine)
           .get(VMContext),
       File.getFileNode(), DIScope(getNonCompileUnitScope(Context)).getRef(), Ty,
-      nullptr, Fn, TParams, Decl, MDNode::getTemporary(VMContext, TElts)};
+      nullptr, Fn, TParams, Decl, Vars};
 
   DISubprogram S(CreateFunc(Elts));
   assert(S.isSubprogram() &&
@@ -976,6 +975,7 @@ DISubprogram DIBuilder::createFunction(DIDescriptor Context, StringRef Name,
   return createFunctionHelper(VMContext, Context, Name, LinkageName, File,
                               LineNo, Ty, isLocalToUnit, isDefinition, ScopeLine,
                               Flags, isOptimized, Fn, TParams, Decl,
+                              MDNode::getTemporary(VMContext, None),
                               [&] (ArrayRef<Value *> Elts) -> MDNode *{
                                 MDNode *Node = MDNode::get(VMContext, Elts);
                                 // Create a named metadata so that we
@@ -996,7 +996,7 @@ DIBuilder::createTempFunctionFwdDecl(DIDescriptor Context, StringRef Name,
                                      MDNode *TParams, MDNode *Decl) {
   return createFunctionHelper(VMContext, Context, Name, LinkageName, File,
                               LineNo, Ty, isLocalToUnit, isDefinition, ScopeLine,
-                              Flags, isOptimized, Fn, TParams, Decl,
+                              Flags, isOptimized, Fn, TParams, Decl, nullptr,
                               [&] (ArrayRef<Value *> Elts) {
                                 return MDNode::getTemporary(VMContext, Elts);
                               });