Set flag for lldb when qualified name lookup is being done

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@253456 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/AST/DeclBase.h

@@ -1142,6 +1142,11 @@ class DeclContext {
   /// that are missing from the lookup table.
   mutable bool HasLazyExternalLexicalLookups : 1;
 
+  /// \brief If \c true, lookups should only return identifier from
+  /// DeclContext scope (for example TranslationUnit). Used in
+  /// LookupQualifiedName()
+  mutable bool UseQualifiedLookup : 1;
+
   /// \brief Pointer to the data structure used to lookup declarations
   /// within this context (or a DependentStoredDeclsMap if this is a
   /// dependent context). We maintain the invariant that, if the map
@@ -1176,6 +1181,7 @@ class DeclContext {
         ExternalVisibleStorage(false),
         NeedToReconcileExternalVisibleStorage(false),
         HasLazyLocalLexicalLookups(false), HasLazyExternalLexicalLookups(false),
+        UseQualifiedLookup(false),
         LookupPtr(nullptr), FirstDecl(nullptr), LastDecl(nullptr) {}
 
 public:
@@ -1756,6 +1762,16 @@ class DeclContext {
                  D == LastDecl);
   }
 
+  bool setUseQualifiedLookup(bool use = true) {
+    bool old_value = UseQualifiedLookup;
+    UseQualifiedLookup = use;
+    return old_value;
+  }
+
+  bool shouldUseQualifiedLookup() const {
+    return UseQualifiedLookup;
+  }
+
   static bool classof(const Decl *D);
   static bool classof(const DeclContext *D) { return true; }
 

lib/Sema/SemaLookup.cpp

@@ -1907,7 +1907,18 @@ bool Sema::LookupQualifiedName(LookupResult &R, DeclContext *LookupCtx,
           cast<TagDecl>(LookupCtx)->isBeingDefined()) &&
          "Declaration context must already be complete!");
 
-  // Perform qualified name lookup into the LookupCtx.
+  struct QualifiedLookupInScope {
+    bool oldVal;
+    DeclContext *Context;
+    // Set flag in DeclContext informing debugger that we're looking for qualified name
+    QualifiedLookupInScope(DeclContext *ctx) : Context(ctx) { 
+      oldVal = ctx->setUseQualifiedLookup(); 
+    }
+    ~QualifiedLookupInScope() { 
+      Context->setUseQualifiedLookup(oldVal); 
+    }
+  } QL(LookupCtx);
+
   if (LookupDirect(*this, R, LookupCtx)) {
     R.resolveKind();
     if (isa<CXXRecordDecl>(LookupCtx))