[clang][Interp] Support ObjCEncodeExprs

Author: tbaederr

clang/lib/AST/Interp/ByteCodeExprGen.cpp

@@ -1688,6 +1688,17 @@ bool ByteCodeExprGen<Emitter>::VisitObjCStringLiteral(
   return this->delegate(E->getString());
 }
 
+template <class Emitter>
+bool ByteCodeExprGen<Emitter>::VisitObjCEncodeExpr(const ObjCEncodeExpr *E) {
+  auto &A = Ctx.getASTContext();
+  std::string Str;
+  A.getObjCEncodingForType(E->getEncodedType(), Str);
+  StringLiteral *SL =
+      StringLiteral::Create(A, Str, StringLiteralKind::Ordinary,
+                            /*Pascal=*/false, E->getType(), E->getAtLoc());
+  return this->delegate(SL);
+}
+
 template <class Emitter>
 bool ByteCodeExprGen<Emitter>::VisitSYCLUniqueStableNameExpr(
     const SYCLUniqueStableNameExpr *E) {

clang/lib/AST/Interp/ByteCodeExprGen.h

@@ -91,6 +91,7 @@ class ByteCodeExprGen : public ConstStmtVisitor<ByteCodeExprGen<Emitter>, bool>,
   bool VisitAbstractConditionalOperator(const AbstractConditionalOperator *E);
   bool VisitStringLiteral(const StringLiteral *E);
   bool VisitObjCStringLiteral(const ObjCStringLiteral *E);
+  bool VisitObjCEncodeExpr(const ObjCEncodeExpr *E);
   bool VisitSYCLUniqueStableNameExpr(const SYCLUniqueStableNameExpr *E);
   bool VisitCharacterLiteral(const CharacterLiteral *E);
   bool VisitCompoundAssignOperator(const CompoundAssignOperator *E);

clang/test/CodeGenObjC/encode-test-3.m

@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 -triple=i686-apple-darwin9 -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple=i686-apple-darwin9 -emit-llvm -o - %s -fexperimental-new-constant-interpreter | FileCheck %s
 
 int main(void) {
   int n;