8293011: riscv: Duplicated stubs to interpreter for static calls

Reviewed-by: fyang

src/hotspot/cpu/riscv/codeBuffer_riscv.cpp

@@ -0,0 +1,32 @@
+/*
+ * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
+ * Copyright (c) 2022, Institute of Software, Chinese Academy of Sciences. 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "asm/codeBuffer.inline.hpp"
+#include "asm/macroAssembler.hpp"
+
+bool CodeBuffer::pd_finalize_stubs() {
+  return emit_shared_stubs_to_interp<MacroAssembler>(this, _shared_stub_to_interp_requests);
+}

src/hotspot/cpu/riscv/codeBuffer_riscv.hpp

@@ -29,15 +29,10 @@
 
 private:
   void pd_initialize() {}
-  bool pd_finalize_stubs() {
-    if (_finalize_stubs) {
-      Unimplemented();
-    }
-    return true;
-  }
+  bool pd_finalize_stubs();
 
 public:
   void flush_bundle(bool start_new_bundle) {}
-  static constexpr bool supports_shared_stubs() { return false; }
+  static constexpr bool supports_shared_stubs() { return true; }
 
 #endif // CPU_RISCV_CODEBUFFER_RISCV_HPP

src/hotspot/cpu/riscv/riscv.ad

@@ -2284,11 +2284,17 @@ encode %{
         return;
       }
 
-      // Emit stub for static call
-      address stub = CompiledStaticCall::emit_to_interp_stub(cbuf);
-      if (stub == NULL) {
-        ciEnv::current()->record_failure("CodeCache is full");
-        return;
+      if (CodeBuffer::supports_shared_stubs() && _method->can_be_statically_bound()) {
+        // Calls of the same statically bound method can share
+        // a stub to the interpreter.
+        cbuf.shared_stub_to_interp_for(_method, cbuf.insts()->mark_off());
+      } else {
+        // Emit stub for static call
+        address stub = CompiledStaticCall::emit_to_interp_stub(cbuf);
+        if (stub == NULL) {
+          ciEnv::current()->record_failure("CodeCache is full");
+          return;
+        }
       }
     }
   %}

test/hotspot/jtreg/compiler/sharedstubs/SharedStubToInterpTest.java

@@ -28,7 +28,7 @@
  * @bug 8280481
  * @library /test/lib
  *
- * @requires os.arch=="amd64" | os.arch=="x86_64" | os.arch=="i386" | os.arch=="x86" | os.arch=="aarch64"
+ * @requires os.arch=="amd64" | os.arch=="x86_64" | os.arch=="i386" | os.arch=="x86" | os.arch=="aarch64" | os.arch=="riscv64"
  *
  * @run driver compiler.sharedstubs.SharedStubToInterpTest
  */