Fix the destruction "properly" in the sense that we actually destroy the

ASTs.  This is a hack, but I haven't considered how we really 
want to do this.

llvm-svn: 51364

clang/Driver/SerializationTest.cpp

@@ -44,7 +44,10 @@ public:
   ~SerializationTest();
 
   virtual void Initialize(ASTContext& context) {
-    if (!TU) TU.reset(new TranslationUnit(context, lopts));
+    if (!TU) {
+      TU.reset(new TranslationUnit(context, lopts));
+      TU->SetOwnsDecls(false);
+    }
   }  
 
   virtual void HandleTopLevelDecl(Decl *D) {

clang/include/clang/AST/TranslationUnit.h

@@ -35,13 +35,18 @@ class TranslationUnit {
   ASTContext* Context;
   std::vector<Decl*> TopLevelDecls;
   bool OwnsMetaData;
+  bool OwnsDecls;
 
   // The default ctor is only invoked during deserialization.
-  explicit TranslationUnit() : Context(NULL), OwnsMetaData(true) {}
+  explicit TranslationUnit() : Context(NULL), OwnsMetaData(true),
+                               OwnsDecls(true) {}
   
 public:
   explicit TranslationUnit(ASTContext& Ctx, const LangOptions& lopt)
-    : LangOpts(lopt), Context(&Ctx), OwnsMetaData(false) {}
+    : LangOpts(lopt), Context(&Ctx), OwnsMetaData(false),
+      OwnsDecls(true) {}
+
+  void SetOwnsDecls(bool val) { OwnsDecls = val; }
 
   ~TranslationUnit();
 

clang/lib/AST/TranslationUnit.cpp

@@ -31,7 +31,7 @@ enum { BasicMetadataBlock = 1,
        DeclsBlock = 3 };
 
 TranslationUnit::~TranslationUnit() {
-  if (OwnsMetaData && Context) {
+  if (OwnsDecls) {
     llvm::DenseSet<Decl*> Killed;
     for (iterator I=begin(), E=end(); I!=E; ++I) {
       if (Killed.count(*I)) continue;
@@ -39,10 +39,13 @@ TranslationUnit::~TranslationUnit() {
       Killed.insert(*I);
       (*I)->Destroy(*Context);
     }
+  }
 
+  if (OwnsMetaData && Context) {
     // The ASTContext object has the sole references to the IdentifierTable
     // Selectors, and the Target information.  Go and delete them, since
     // the TranslationUnit effectively owns them.
+    
     delete &(Context->Idents);
     delete &(Context->Selectors);
     delete &(Context->Target);