Fix crash & accepts-invalid for array of arrays of user defined type.

Test case/other help by Richard Smith.
Code review by John McCall.

llvm-svn: 152519

Author: dwblaikie

clang/lib/Sema/SemaExprCXX.cpp

@@ -1330,14 +1330,17 @@ Sema::BuildCXXNew(SourceLocation StartLoc, bool UseGlobal,
   // C++0x [expr.new]p17:
   //   If the new expression creates an array of objects of class type,
   //   access and ambiguity control are done for the destructor.
-  if (ArraySize && AllocType->isRecordType() && !AllocType->isDependentType()) {
-    if (CXXDestructorDecl *dtor = LookupDestructor(
-            cast<CXXRecordDecl>(AllocType->getAs<RecordType>()->getDecl()))) {
-      MarkFunctionReferenced(StartLoc, dtor);
-      CheckDestructorAccess(StartLoc, dtor, 
-                            PDiag(diag::err_access_dtor)
-                              << Context.getBaseElementType(AllocType));
-      DiagnoseUseOfDecl(dtor, StartLoc);
+  QualType BaseAllocType = Context.getBaseElementType(AllocType);
+  if (ArraySize && !BaseAllocType->isDependentType()) {
+    if (const RecordType *BaseRecordType = BaseAllocType->getAs<RecordType>()) {
+      if (CXXDestructorDecl *dtor = LookupDestructor(
+              cast<CXXRecordDecl>(BaseRecordType->getDecl()))) {
+        MarkFunctionReferenced(StartLoc, dtor);
+        CheckDestructorAccess(StartLoc, dtor, 
+                              PDiag(diag::err_access_dtor)
+                                << BaseAllocType);
+        DiagnoseUseOfDecl(dtor, StartLoc);
+      }
     }
   }
 

clang/test/CXX/expr/expr.unary/expr.new/p17-crash.cpp

@@ -0,0 +1,14 @@
+// RUN: %clang_cc1 -emit-llvm-only %s
+
+// this used to crash due to templ<int>'s dtor not being marked as used by the
+// new expression in func()
+struct non_trivial {
+  non_trivial() {} 
+  ~non_trivial() {}
+};
+template < typename T > class templ {
+  non_trivial n;
+};
+void func() {
+  new templ<int>[1][1];
+}

clang/test/CXX/expr/expr.unary/expr.new/p17.cpp

@@ -0,0 +1,16 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+class ctor {
+  ctor(); // expected-note{{implicitly declared private here}}
+};
+
+class dtor {
+  ~dtor(); // expected-note 3 {{implicitly declared private here}}
+};
+
+void test() {
+  new ctor[0]; // expected-error{{calling a private constructor of class 'ctor'}}
+  new dtor[0]; // expected-error{{calling a private destructor of class 'dtor'}}
+  new dtor[3]; // expected-error{{calling a private destructor of class 'dtor'}}
+  new dtor[3][3]; // expected-error{{calling a private destructor of class 'dtor'}}
+}