Revert r331843 "[DebugInfo] Generate debug information for labels."

It broke the Chromium build (see reply on the review).

> Generate DILabel metadata and call llvm.dbg.label after label
> statement to associate the metadata with the label.
>
> Differential Revision: https://reviews.llvm.org/D45045
>
> Patch by Hsiangkai Wang.

This doesn't revert the change to backend-unsupported-error.ll
that seems to correspond to an llvm-side change.

llvm-svn: 331861

3 files changed, 0 insertions, 39 deletions

diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index 2c64f6e06da..12209723999 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -3647,32 +3647,6 @@ CGDebugInfo::EmitDeclareOfAutoVariable(const VarDecl *VD, llvm::Value *Storage,
   return EmitDeclare(VD, Storage, llvm::None, Builder);
 }
 
-void CGDebugInfo::EmitLabel(const LabelDecl *D, CGBuilderTy &Builder) {
-  assert(DebugKind >= codegenoptions::LimitedDebugInfo);
-  assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
-
-  if (D->hasAttr<NoDebugAttr>())
-    return;
-
-  auto *Scope = cast<llvm::DIScope>(LexicalBlockStack.back());
-  llvm::DIFile *Unit = getOrCreateFile(D->getLocation());
-
-  // Get location information.
-  unsigned Line = getLineNumber(D->getLocation());
-  unsigned Column = getColumnNumber(D->getLocation());
-
-  StringRef Name = D->getName();
-
-  // Create the descriptor for the label.
-  auto *L =
-      DBuilder.createLabel(Scope, Name, Unit, Line, CGM.getLangOpts().Optimize);
-
-  // Insert an llvm.dbg.label into the current block.
-  DBuilder.insertLabel(L,
-                       llvm::DebugLoc::get(Line, Column, Scope, CurInlinedAt),
-                       Builder.GetInsertBlock());
-}
-
 llvm::DIType *CGDebugInfo::CreateSelfType(const QualType &QualTy,
                                           llvm::DIType *Ty) {
   llvm::DIType *CachedTy = getTypeOrNull(QualTy);
diff --git a/clang/lib/CodeGen/CGDebugInfo.h b/clang/lib/CodeGen/CGDebugInfo.h
index fa06e87f11a..a692babef53 100644
--- a/clang/lib/CodeGen/CGDebugInfo.h
+++ b/clang/lib/CodeGen/CGDebugInfo.h
@@ -396,9 +396,6 @@ public:
                                                    llvm::Value *AI,
                                                    CGBuilderTy &Builder);
 
-  /// Emit call to \c llvm.dbg.label for an label.
-  void EmitLabel(const LabelDecl *D, CGBuilderTy &Builder);
-
   /// Emit call to \c llvm.dbg.declare for an imported variable
   /// declaration in a block.
   void EmitDeclareOfBlockDeclRefVariable(const VarDecl *variable,
diff --git a/clang/lib/CodeGen/CGStmt.cpp b/clang/lib/CodeGen/CGStmt.cpp
index b121fae0be5..779bda681e4 100644
--- a/clang/lib/CodeGen/CGStmt.cpp
+++ b/clang/lib/CodeGen/CGStmt.cpp
@@ -531,16 +531,6 @@ void CodeGenFunction::EmitLabel(const LabelDecl *D) {
   }
 
   EmitBlock(Dest.getBlock());
-
-  // Emit debug info for labels.
-  if (CGDebugInfo *DI = getDebugInfo()) {
-    if (CGM.getCodeGenOpts().getDebugInfo() >=
-        codegenoptions::LimitedDebugInfo) {
-      DI->setLocation(D->getLocation());
-      DI->EmitLabel(D, Builder);
-    }
-  }
-
   incrementProfileCounter(D->getStmt());
 }