[clang][Interp] Handle AttributedStmts (llvm#66495)

Just ignore the attributes.

Author: tbaederr

clang/lib/AST/Interp/ByteCodeStmtGen.cpp

@@ -243,6 +243,8 @@ bool ByteCodeStmtGen<Emitter>::visitStmt(const Stmt *S) {
   case Stmt::GCCAsmStmtClass:
   case Stmt::MSAsmStmtClass:
     return visitAsmStmt(cast<AsmStmt>(S));
+  case Stmt::AttributedStmtClass:
+    return visitAttributedStmt(cast<AttributedStmt>(S));
   case Stmt::NullStmtClass:
     return true;
   default: {
@@ -625,6 +627,12 @@ bool ByteCodeStmtGen<Emitter>::visitAsmStmt(const AsmStmt *S) {
   return this->emitInvalid(S);
 }
 
+template <class Emitter>
+bool ByteCodeStmtGen<Emitter>::visitAttributedStmt(const AttributedStmt *S) {
+  // Ignore all attributes.
+  return this->visitStmt(S->getSubStmt());
+}
+
 namespace clang {
 namespace interp {
 

clang/lib/AST/Interp/ByteCodeStmtGen.h

@@ -64,6 +64,7 @@ class ByteCodeStmtGen final : public ByteCodeExprGen<Emitter> {
   bool visitCaseStmt(const CaseStmt *S);
   bool visitDefaultStmt(const DefaultStmt *S);
   bool visitAsmStmt(const AsmStmt *S);
+  bool visitAttributedStmt(const AttributedStmt *S);
 
   bool emitLambdaStaticInvokerBody(const CXXMethodDecl *MD);
 

clang/test/AST/Interp/if.cpp

@@ -43,4 +43,11 @@ namespace InitDecl {
     return false;
   }
   static_assert(!f2(), "");
+
+
+  constexpr int attrs() {
+    if (1) [[likely]] {}
+    return 1;
+  }
+  static_assert(attrs() == 1, "");
 };