[NFC, Scoped Enum] Convert Sema::ExpressionEvaluationContext into a scoped Enum

- also replace direct equality checks against the ConstantEvaluated enumerator  with isConstantEvaluted(), in anticipation of adding finer granularity to the various ConstantEvaluated contexts and reinstating certain restrictions on where lambda expressions can occur in C++17.

- update the clang tablegen backend that uses these Enumerators, and add the relevant scope where needed.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@299316 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 3 deletions

diff --git a/lib/Sema/SemaDeclCXX.cpp b/lib/Sema/SemaDeclCXX.cpp
index 508cb840a0..fd3f266c9a 100644
--- a/lib/Sema/SemaDeclCXX.cpp
+++ b/lib/Sema/SemaDeclCXX.cpp
@@ -981,7 +981,8 @@ namespace { enum class IsTupleLike { TupleLike, NotTupleLike, Error }; }
 
 static IsTupleLike isTupleLike(Sema &S, SourceLocation Loc, QualType T,
                                llvm::APSInt &Size) {
-  EnterExpressionEvaluationContext ContextRAII(S, Sema::ConstantEvaluated);
+  EnterExpressionEvaluationContext ContextRAII(
+      S, Sema::ExpressionEvaluationContext::ConstantEvaluated);
 
   DeclarationName Value = S.PP.getIdentifierInfo("value");
   LookupResult R(S, Value, Loc, Sema::LookupOrdinaryName);
@@ -13117,7 +13118,8 @@ VarDecl *Sema::BuildExceptionDeclaration(Scope *S,
   if (!Invalid && !ExDeclType->isDependentType()) {
     if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) {
       // Insulate this from anything else we might currently be parsing.
-      EnterExpressionEvaluationContext scope(*this, PotentiallyEvaluated);
+      EnterExpressionEvaluationContext scope(
+          *this, ExpressionEvaluationContext::PotentiallyEvaluated);
 
       // C++ [except.handle]p16:
       //   The object declared in an exception-declaration or, if the
@@ -14201,7 +14203,8 @@ void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) {
   // new expression evaluation context that is associated with this static
   // data member.
   if (isStaticDataMember(D))
-    PushExpressionEvaluationContext(PotentiallyEvaluated, D);
+    PushExpressionEvaluationContext(
+        ExpressionEvaluationContext::PotentiallyEvaluated, D);
 }
 
 /// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an