1 /*
 2  * Copyright (c) 2020, 2021, Oracle and/or its affiliates. All rights reserved.
 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 4  *
 5  * This code is free software; you can redistribute it and/or modify it
 6  * under the terms of the GNU General Public License version 2 only, as
 7  * published by the Free Software Foundation.
 8  *
 9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  */
23 
24 #include "precompiled.hpp"
25 #include "code/codeBlob.hpp"
26 #include "code/codeCache.hpp"
27 #include "runtime/interfaceSupport.inline.hpp"
28 
29 JVM_ENTRY(static jboolean, UH_FreeUpcallStub0(JNIEnv *env, jobject _unused, jlong addr))
30   // safe to call 'find_blob' without code cache lock, because stub is always alive
31   CodeBlob* cb = CodeCache::find_blob((char*)addr);
32   if (cb == nullptr) {
33     return false;
34   }
35   OptimizedEntryBlob::free(cb->as_optimized_entry_blob());
36   return true;
37 JVM_END
38 
39 #define CC (char*)  /*cast a literal from (const char*)*/
40 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f)
41 #define LANG "Ljava/lang/"
42 
43 // These are the native methods on jdk.internal.foreign.NativeInvoker.
44 static JNINativeMethod UH_methods[] = {
45   {CC "freeUpcallStub0",     CC "(J)Z",                FN_PTR(UH_FreeUpcallStub0)}
46 };
47 
48 /**
49  * This one function is exported, used by NativeLookup.
50  */
51 JVM_LEAF(void, JVM_RegisterUpcallHandlerMethods(JNIEnv *env, jclass UH_class))
52   int status = env->RegisterNatives(UH_class, UH_methods, sizeof(UH_methods)/sizeof(JNINativeMethod));
53   guarantee(status == JNI_OK && !env->ExceptionOccurred(),
54             "register jdk.internal.foreign.abi.UpcallStubs natives");
55 JVM_END
56