Fix a cluster of related issues involving value-dependence and constant

expression evaluation:
 - When folding a non-value-dependent expression, we may try to use the
   initializer of a value-dependent variable. If that happens, give up.
 - In C++98, actually check that a const, non-volatile DeclRefExpr inside an ICE
   is of integral or enumeration type (a reference isn't OK!)
 - In C++11, DeclRefExprs for objects of const literal type initialized with
   value-dependent expressions are themselves value-dependent.
 - So are references initialized with value-dependent expressions (though this
   case is missing from the C++11 standard, along with many others).

llvm-svn: 144056

1 files changed, 4 insertions, 1 deletions

diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index 746b094619c..d6e263b4476 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -552,7 +552,7 @@ static bool EvaluateVarDeclInit(EvalInfo &Info, const VarDecl *VD,
     return false;
 
   const Expr *Init = VD->getAnyInitializer();
-  if (!Init)
+  if (!Init || Init->isValueDependent())
     return false;
 
   if (APValue *V = VD->getEvaluatedValue()) {
@@ -3640,6 +3640,9 @@ static ICEDiag CheckICE(const Expr* E, ASTContext &Ctx) {
       //   A variable of non-volatile const-qualified integral or enumeration
       //   type initialized by an ICE can be used in ICEs.
       if (const VarDecl *Dcl = dyn_cast<VarDecl>(D)) {
+        if (!Dcl->getType()->isIntegralOrEnumerationType())
+          return ICEDiag(2, cast<DeclRefExpr>(E)->getLocation());
+
         // Look for a declaration of this variable that has an initializer.
         const VarDecl *ID = 0;
         const Expr *Init = Dcl->getAnyInitializer(ID);