Vendor import of clang trunk r132879:

http://llvm.org/svn/llvm-project/cfe/trunk@132879

1 files changed, 39 insertions, 11 deletions

diff --git a/lib/Sema/JumpDiagnostics.cpp b/lib/Sema/JumpDiagnostics.cpp
index 867d78f..ae154aa 100644
--- a/lib/Sema/JumpDiagnostics.cpp
+++ b/lib/Sema/JumpDiagnostics.cpp
@@ -15,6 +15,7 @@
 #include "clang/Sema/SemaInternal.h"
 #include "clang/AST/DeclCXX.h"
 #include "clang/AST/Expr.h"
+#include "clang/AST/ExprCXX.h"
 #include "clang/AST/StmtObjC.h"
 #include "clang/AST/StmtCXX.h"
 #include "llvm/ADT/BitVector.h"
@@ -126,18 +127,45 @@ static std::pair<unsigned,unsigned>
       InDiag = diag::note_protected_by_cleanup;
       OutDiag = diag::note_exits_cleanup;
     } else if (isCPlusPlus) {
-      // FIXME: In C++0x, we have to check more conditions than "did we
-      // just give it an initializer?". See 6.7p3.
-      if (VD->hasLocalStorage() && VD->hasInit())
-        InDiag = diag::note_protected_by_variable_init;
-
-      CanQualType T = VD->getType()->getCanonicalTypeUnqualified();
+      if (!VD->hasLocalStorage())
+        return std::make_pair(InDiag, OutDiag);
+      
+      ASTContext &Context = D->getASTContext();
+      QualType T = Context.getBaseElementType(VD->getType());
       if (!T->isDependentType()) {
-        while (CanQual<ArrayType> AT = T->getAs<ArrayType>())
-          T = AT->getElementType();
-        if (CanQual<RecordType> RT = T->getAs<RecordType>())
-          if (!cast<CXXRecordDecl>(RT->getDecl())->hasTrivialDestructor())
-            OutDiag = diag::note_exits_dtor;
+        // C++0x [stmt.dcl]p3:
+        //   A program that jumps from a point where a variable with automatic
+        //   storage duration is not in scope to a point where it is in scope
+        //   is ill-formed unless the variable has scalar type, class type with
+        //   a trivial default constructor and a trivial destructor, a 
+        //   cv-qualified version of one of these types, or an array of one of
+        //   the preceding types and is declared without an initializer (8.5).
+        // Check whether this is a C++ class.
+        CXXRecordDecl *Record = T->getAsCXXRecordDecl();
+        
+        if (const Expr *Init = VD->getInit()) {
+          bool CallsTrivialConstructor = false;
+          if (Record) {
+            // FIXME: With generalized initializer lists, this may
+            // classify "X x{};" as having no initializer.
+            if (const CXXConstructExpr *Construct 
+                                        = dyn_cast<CXXConstructExpr>(Init))
+              if (const CXXConstructorDecl *Constructor
+                                                = Construct->getConstructor())
+                if ((Context.getLangOptions().CPlusPlus0x
+                       ? Record->hasTrivialDefaultConstructor()
+                       : Record->isPOD()) &&
+                    Constructor->isDefaultConstructor())
+                  CallsTrivialConstructor = true;
+          }
+          
+          if (!CallsTrivialConstructor)
+            InDiag = diag::note_protected_by_variable_init;
+        }
+        
+        // Note whether we have a class with a non-trivial destructor.
+        if (Record && !Record->hasTrivialDestructor())
+          OutDiag = diag::note_exits_dtor;
       }
     }