When destroying a translation unit, deallocate its owned declarations in reverse order, because there may be dependencies among the declarations.

llvm-svn: 58244

clang/include/clang/AST/Decl.h

@@ -514,23 +514,10 @@ public:
   typedef ParmVarDecl * const *param_const_iterator;
   
   param_iterator param_begin() { return ParamInfo; }
-  param_iterator param_end() {
+  param_iterator param_end()   { return ParamInfo+param_size(); }
-
-    // Special-case for handling typedefs:
-    //
-    //  typedef void func_t(int x);
-    //  func_t a;
-    //
-    // In the case of the FunctionDecl for "a", there are no ParmVarDecls.
-
-    return ParamInfo ? ParamInfo+param_size() : 0x0;
-  }
   
   param_const_iterator param_begin() const { return ParamInfo; }
-  
+  param_const_iterator param_end() const   { return ParamInfo+param_size(); }
-  param_const_iterator param_end() const {
-    return ParamInfo ? ParamInfo+param_size() : 0x0;
-  }
   
   unsigned getNumParams() const;
   const ParmVarDecl *getParamDecl(unsigned i) const {

clang/lib/AST/TranslationUnit.cpp

@@ -33,7 +33,9 @@ enum { BasicMetadataBlock = 1,
 TranslationUnit::~TranslationUnit() {
   if (OwnsDecls) {
     llvm::DenseSet<Decl*> Killed;
-    for (iterator I=begin(), E=end(); I!=E; ++I) {
+    for (std::vector<Decl*>::reverse_iterator I=TopLevelDecls.rbegin(), 
+                                              E=TopLevelDecls.rend(); 
+         I!=E; ++I) {
       if (Killed.count(*I)) continue;
 
       Killed.insert(*I);

clang/test/SemaCXX/fntype-decl.cpp

@@ -3,3 +3,13 @@
 // PR2942
 typedef void fn(int);
 fn f;
+
+int g(int x, int y);
+int g(int x, int y = 2);
+
+typedef int g_type(int, int);
+g_type g;
+
+int h(int x) {
+  return g(x);
+}