Implement "Destroy" and destructor for ObjCClassDecl, allowing us to reclaim its memory and the memory of the Decls it owns.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52059 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 49 insertions, 6 deletions

diff --git a/include/clang/AST/DeclObjC.h b/include/clang/AST/DeclObjC.h
index a50c08f344..1582d73ee8 100644
--- a/include/clang/AST/DeclObjC.h
+++ b/include/clang/AST/DeclObjC.h
@@ -646,7 +646,14 @@ class ObjCClassDecl : public Decl {
     }
     NumForwardDecls = nElts;
   }
+  
+  virtual ~ObjCClassDecl();
+  
 public:
+  
+  /// Destroy - Call destructors and release memory.
+  virtual void Destroy(ASTContext& C);
+  
   static ObjCClassDecl *Create(ASTContext &C, SourceLocation L,
                                ObjCInterfaceDecl **Elts, unsigned nElts);
   
@@ -657,6 +664,10 @@ public:
   ObjCInterfaceDecl** getForwardDecls() const { return ForwardDecls; }
   int getNumForwardDecls() const { return NumForwardDecls; }
   
+  typedef ObjCInterfaceDecl * const * iterator;
+  iterator begin() const { return ForwardDecls; }
+  iterator end() const { return ForwardDecls+NumForwardDecls; }
+  
   static bool classof(const Decl *D) { return D->getKind() == ObjCClass; }
   static bool classof(const ObjCClassDecl *D) { return true; }
 };
diff --git a/lib/AST/DeclObjC.cpp b/lib/AST/DeclObjC.cpp
index a0d281808e..08df62d5b9 100644
--- a/lib/AST/DeclObjC.cpp
+++ b/lib/AST/DeclObjC.cpp
@@ -134,6 +134,23 @@ ObjCClassDecl *ObjCClassDecl::Create(ASTContext &C,
   return new (Mem) ObjCClassDecl(L, Elts, nElts);
 }
 
+ObjCClassDecl::~ObjCClassDecl() {
+  delete [] ForwardDecls;
+}
+
+void ObjCClassDecl::Destroy(ASTContext& C) {
+  
+  // FIXME: There is no clear ownership policy now for referenced
+  //  ObjCInterfaceDecls.  Some of them can be forward declarations that
+  //  are never later defined (in which case the ObjCClassDecl owns them)
+  //  or the ObjCInterfaceDecl later becomes a real definition later.  Ideally
+  //  we should have separate objects for forward declarations and definitions,
+  //  obviating this problem.  Because of this situation, referenced
+  //  ObjCInterfaceDecls are destroyed in ~TranslationUnit.
+  
+  Decl::Destroy(C);
+}
+
 ObjCForwardProtocolDecl *
 ObjCForwardProtocolDecl::Create(ASTContext &C,
                                 SourceLocation L, 
diff --git a/lib/AST/TranslationUnit.cpp b/lib/AST/TranslationUnit.cpp
index a683625789..5e644cf983 100644
--- a/lib/AST/TranslationUnit.cpp
+++ b/lib/AST/TranslationUnit.cpp
@@ -57,13 +57,28 @@ TranslationUnit::~TranslationUnit() {
       //  eventually be fixed when the ownership of ObjCPropertyDecls gets
       //  cleaned up.
       if (ObjCProtocolDecl* PDecl = dyn_cast<ObjCProtocolDecl>(*I))
-        for (ObjCInterfaceDecl::classprop_iterator PD=PDecl->classprop_begin(),
-             ED=PDecl->classprop_end(); PD!=ED; ++PD) {          
-          if (!*PD || Killed.count(*PD)) continue;
-          Killed.insert(*PD);
-          (*PD)->Destroy(*Context);
+        for (ObjCProtocolDecl::classprop_iterator ID=PDecl->classprop_begin(),
+             ED=PDecl->classprop_end(); ID!=ED; ++ID) {
+          if (!*ID || Killed.count(*ID)) continue;
+          Killed.insert(*ID);
+          (*ID)->Destroy(*Context);
         }
-      
+            
+      // FIXME: There is no clear ownership policy now for ObjCInterfaceDecls
+      //  referenced by ObjCClassDecls.  Some of them can be forward decls that
+      //  are never later defined (in which case the ObjCClassDecl owns them)
+      //  or the ObjCInterfaceDecl later becomes a real definition later. 
+      //  Ideally we should have separate objects for forward declarations and
+      //  definitions, obviating this problem.  Because of this situation,
+      //  referenced ObjCInterfaceDecls are destroyed here.      
+      if (ObjCClassDecl* CDecl = dyn_cast<ObjCClassDecl>(*I))
+        for (ObjCClassDecl::iterator ID=CDecl->begin(),
+             ED=CDecl->end(); ID!=ED; ++ID) {          
+          if (!*ID || Killed.count(*ID)) continue;
+          Killed.insert(*ID);
+          (*ID)->Destroy(*Context);
+        }
+            
       (*I)->Destroy(*Context);
     }
   }