Revert "[DebugInfo] Fix debug info generation for function static variables, typedefs, and records"

Caused PR24008.

This reverts commit r241154.

llvm-svn: 241177

3 files changed, 7 insertions, 51 deletions

diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index 7368dc69f51..8c4b4b3d061 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -786,18 +786,15 @@ llvm::DIType *CGDebugInfo::CreateType(const TemplateSpecializationType *Ty,
 
 llvm::DIType *CGDebugInfo::CreateType(const TypedefType *Ty,
                                       llvm::DIFile *Unit) {
-  TypedefNameDecl *TD = Ty->getDecl();
   // We don't set size information, but do specify where the typedef was
   // declared.
-  SourceLocation Loc = TD->getLocation();
-
-  llvm::DIScope *TDContext = getDeclarationLexicalScope(*TD, QualType(Ty, 0));
+  SourceLocation Loc = Ty->getDecl()->getLocation();
 
   // Typedefs are derived from some other type.
   return DBuilder.createTypedef(
       getOrCreateType(Ty->getDecl()->getUnderlyingType(), Unit),
       Ty->getDecl()->getName(), getOrCreateFile(Loc), getLineNumber(Loc),
-      TDContext);
+      getContextDescriptor(cast<Decl>(Ty->getDecl()->getDeclContext())));
 }
 
 llvm::DIType *CGDebugInfo::CreateType(const FunctionType *Ty,
@@ -1445,23 +1442,6 @@ llvm::DIType *CGDebugInfo::getOrCreateInterfaceType(QualType D,
   return T;
 }
 
-void CGDebugInfo::recordDeclarationLexicalScope(const Decl &D) {
-  assert(LexicalBlockMap.find(&D) == LexicalBlockMap.end() &&
-         "D is already mapped to lexical block scope");
-  if (!LexicalBlockStack.empty())
-    LexicalBlockMap[&D] = LexicalBlockStack.back();
-}
-
-llvm::DIScope *CGDebugInfo::getDeclarationLexicalScope(const Decl &D,
-                                                       QualType Ty) {
-  auto I = LexicalBlockMap.find(&D);
-  if (I != LexicalBlockMap.end()) {
-    RetainedTypes.push_back(Ty.getAsOpaquePtr());
-    return I->second;
-  } else
-    return getContextDescriptor(cast<Decl>(D.getDeclContext()));
-}
-
 void CGDebugInfo::completeType(const EnumDecl *ED) {
   if (DebugKind <= CodeGenOptions::DebugLineTablesOnly)
     return;
@@ -2289,7 +2269,8 @@ llvm::DICompositeType *CGDebugInfo::CreateLimitedType(const RecordType *Ty) {
   unsigned Line = getLineNumber(RD->getLocation());
   StringRef RDName = getClassName(RD);
 
-  llvm::DIScope *RDContext = getDeclarationLexicalScope(*RD, QualType(Ty, 0));
+  llvm::DIScope *RDContext =
+      getContextDescriptor(cast<Decl>(RD->getDeclContext()));
 
   // If we ended up creating the type during the context chain construction,
   // just return that.
@@ -2435,14 +2416,7 @@ void CGDebugInfo::collectVarDeclProps(const VarDecl *VD, llvm::DIFile *&Unit,
   // outside the class by putting it in the global scope.
   if (DC->isRecord())
     DC = CGM.getContext().getTranslationUnitDecl();
-
-  if (VD->isStaticLocal()) {
-    // Get context for static locals (that are technically globals) the same way
-    // we do for "local" locals -- by using current lexical block.
-    assert(!LexicalBlockStack.empty() && "Region stack mismatch, stack empty!");
-    VDContext = LexicalBlockStack.back();
-  } else
-    VDContext = getContextDescriptor(dyn_cast<Decl>(DC));
+  VDContext = getContextDescriptor(dyn_cast<Decl>(DC));
 }
 
 llvm::DISubprogram *
diff --git a/clang/lib/CodeGen/CGDebugInfo.h b/clang/lib/CodeGen/CGDebugInfo.h
index a4e51e99df6..10d3b0d9ab0 100644
--- a/clang/lib/CodeGen/CGDebugInfo.h
+++ b/clang/lib/CodeGen/CGDebugInfo.h
@@ -100,11 +100,6 @@ class CGDebugInfo {
 
   // LexicalBlockStack - Keep track of our current nested lexical block.
   std::vector<llvm::TypedTrackingMDRef<llvm::DIScope>> LexicalBlockStack;
-
-  /// \brief Map of AST declaration to its lexical block scope.
-  llvm::DenseMap<const Decl *, llvm::TypedTrackingMDRef<llvm::DIScope>>
-      LexicalBlockMap;
-
   llvm::DenseMap<const Decl *, llvm::TrackingMDRef> RegionMap;
   // FnBeginRegionCount - Keep track of LexicalBlockStack counter at the
   // beginning of a function. This is used to pop unbalanced regions at
@@ -310,12 +305,6 @@ public:
   /// debug info.
   llvm::DIType *getOrCreateInterfaceType(QualType Ty, SourceLocation Loc);
 
-  /// \brief Map AST declaration to its lexical block scope if available.
-  void recordDeclarationLexicalScope(const Decl &D);
-
-  /// \brief Get lexical scope of AST declaration.
-  llvm::DIScope *getDeclarationLexicalScope(const Decl &D, QualType Ty);
-
   void completeType(const EnumDecl *ED);
   void completeType(const RecordDecl *RD);
   void completeRequiredType(const RecordDecl *RD);
diff --git a/clang/lib/CodeGen/CGDecl.cpp b/clang/lib/CodeGen/CGDecl.cpp
index 7550266e7b2..07dbce4252f 100644
--- a/clang/lib/CodeGen/CGDecl.cpp
+++ b/clang/lib/CodeGen/CGDecl.cpp
@@ -81,8 +81,10 @@ void CodeGenFunction::EmitDecl(const Decl &D) {
   case Decl::UsingShadow:
     llvm_unreachable("Declaration should not be in declstmts!");
   case Decl::Function:  // void X();
+  case Decl::Record:    // struct/union/class X;
   case Decl::Enum:      // enum X;
   case Decl::EnumConstant: // enum ? { X = ? }
+  case Decl::CXXRecord: // struct/union/class X; [C++]
   case Decl::StaticAssert: // static_assert(X, ""); [C++0x]
   case Decl::Label:        // __label__ x;
   case Decl::Import:
@@ -91,12 +93,6 @@ void CodeGenFunction::EmitDecl(const Decl &D) {
     // None of these decls require codegen support.
     return;
 
-  case Decl::CXXRecord: // struct/union/class X; [C++]
-  case Decl::Record:    // struct/union/class X;
-    if (CGDebugInfo *DI = getDebugInfo())
-      DI->recordDeclarationLexicalScope(D);
-    return;
-
   case Decl::NamespaceAlias:
     if (CGDebugInfo *DI = getDebugInfo())
         DI->EmitNamespaceAlias(cast<NamespaceAliasDecl>(D));
@@ -121,9 +117,6 @@ void CodeGenFunction::EmitDecl(const Decl &D) {
     const TypedefNameDecl &TD = cast<TypedefNameDecl>(D);
     QualType Ty = TD.getUnderlyingType();
 
-    if (CGDebugInfo *DI = getDebugInfo())
-      DI->recordDeclarationLexicalScope(D);
-
     if (Ty->isVariablyModifiedType())
       EmitVariablyModifiedType(Ty);
   }