When we're building a CXXExprWithTemporaries, only include those

temporaries that are within our current evaluation context. That way,
nested evaluation contexts (e.g., within a sizeof() expression) won't
see temporaries from outer contexts. Also, make sure to push a new
evaluation context when instantiating the initializer of a variable;
this may be an unevaluated context or a potentially-evaluated context,
depending on whether it's an in-class initializer or not. Fixes PR5672.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@90460 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 16 insertions, 4 deletions

diff --git a/lib/Sema/SemaExprCXX.cpp b/lib/Sema/SemaExprCXX.cpp
index 148dc63944..44f7816798 100644
--- a/lib/Sema/SemaExprCXX.cpp
+++ b/lib/Sema/SemaExprCXX.cpp
@@ -2069,14 +2069,17 @@ Expr *Sema::MaybeCreateCXXExprWithTemporaries(Expr *SubExpr,
                                               bool ShouldDestroyTemps) {
   assert(SubExpr && "sub expression can't be null!");
 
-  if (ExprTemporaries.empty())
+  unsigned FirstTemporary = ExprEvalContexts.back().NumTemporaries;
+  assert(ExprTemporaries.size() >= FirstTemporary);
+  if (ExprTemporaries.size() == FirstTemporary)
     return SubExpr;
 
   Expr *E = CXXExprWithTemporaries::Create(Context, SubExpr,
-                                           &ExprTemporaries[0],
-                                           ExprTemporaries.size(),
+                                           &ExprTemporaries[FirstTemporary],
+                                    ExprTemporaries.size() - FirstTemporary,
                                            ShouldDestroyTemps);
-  ExprTemporaries.clear();
+  ExprTemporaries.erase(ExprTemporaries.begin() + FirstTemporary,
+                        ExprTemporaries.end());
 
   return E;
 }
diff --git a/lib/Sema/SemaTemplateInstantiateDecl.cpp b/lib/Sema/SemaTemplateInstantiateDecl.cpp
index 95725bf44f..394f0eee72 100644
--- a/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -193,6 +193,11 @@ Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) {
                                                      TSK_ImplicitInstantiation);
   
   if (D->getInit()) {
+    if (Var->isStaticDataMember() && !D->isOutOfLine())
+      SemaRef.PushExpressionEvaluationContext(Sema::Unevaluated);
+    else
+      SemaRef.PushExpressionEvaluationContext(Sema::PotentiallyEvaluated);
+
     OwningExprResult Init
       = SemaRef.SubstExpr(D->getInit(), TemplateArgs);
     if (Init.isInvalid())
@@ -235,6 +240,7 @@ Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) {
     } else
       SemaRef.AddInitializerToDecl(Sema::DeclPtrTy::make(Var), move(Init),
                                    D->hasCXXDirectInitializer());
+    SemaRef.PopExpressionEvaluationContext();
   } else if (!Var->isStaticDataMember() || Var->isOutOfLine())
     SemaRef.ActOnUninitializedDecl(Sema::DeclPtrTy::make(Var), false);
 
diff --git a/lib/Sema/SemaType.cpp b/lib/Sema/SemaType.cpp
index afce5e33ba..526ab91e9f 100644
--- a/lib/Sema/SemaType.cpp
+++ b/lib/Sema/SemaType.cpp
@@ -897,6 +897,9 @@ QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S,
     break;
   }
   
+  if (T.isNull())
+    return T;
+
   if (T == Context.UndeducedAutoTy) {
     int Error = -1;