diff a/src/hotspot/cpu/riscv/c1_CodeStubs_riscv.cpp b/src/hotspot/cpu/riscv/c1_CodeStubs_riscv.cpp
--- a/src/hotspot/cpu/riscv/c1_CodeStubs_riscv.cpp
+++ b/src/hotspot/cpu/riscv/c1_CodeStubs_riscv.cpp
@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 1999, 2025, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2026, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2014, Red Hat Inc. All rights reserved.
  * Copyright (c) 2020, 2023, Huawei Technologies Co., Ltd. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -164,15 +164,17 @@
   assert(_result->as_register() == x10, "result must in x10");
   __ j(_continuation);
 }
 
 // Implementation of NewObjectArrayStub
-NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
+NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result,
+                                       CodeEmitInfo* info, bool is_null_free) {
   _klass_reg = klass_reg;
   _result = result;
   _length = length;
   _info = new CodeEmitInfo(info);
+  _is_null_free = is_null_free; // unimplemented
 }
 
 void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
   assert(__ rsp_offset() == 0, "frame size should be fixed");
   __ bind(_entry);
@@ -328,6 +330,32 @@
 #endif
 
   __ j(_continuation);
 }
 
+// Implementation of SubstitutabilityCheckStub
+SubstitutabilityCheckStub::SubstitutabilityCheckStub(LIR_Opr left, LIR_Opr right, CodeEmitInfo* info) {
+  Unimplemented();
+}
+
+void SubstitutabilityCheckStub::emit_code(LIR_Assembler* ce) {
+  Unimplemented();
+}
+
+LoadFlattenedArrayStub::LoadFlattenedArrayStub(LIR_Opr array, LIR_Opr index, LIR_Opr result, CodeEmitInfo* info) {
+  Unimplemented();
+}
+
+void LoadFlattenedArrayStub::emit_code(LIR_Assembler* ce) {
+  Unimplemented();
+}
+
+// Implementation of StoreFlattenedArrayStub
+
+StoreFlattenedArrayStub::StoreFlattenedArrayStub(LIR_Opr array, LIR_Opr index, LIR_Opr value, CodeEmitInfo* info) {
+  Unimplemented();
+}
+
+void StoreFlattenedArrayStub::emit_code(LIR_Assembler* ce) {
+  Unimplemented();
+}
 #undef __