1 /* 2 * Copyright (c) 2019, 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 25 #ifndef SHARE_JVMCI_JNIACCESSMARK_INLINE_HPP 26 #define SHARE_JVMCI_JNIACCESSMARK_INLINE_HPP 27 28 #include "code/nmethod.hpp" 29 #include "jvmci/jvmciEnv.hpp" 30 #include "runtime/interfaceSupport.inline.hpp" 31 32 // Wrapper for a JNI call into the JVMCI shared library. 33 // This performs a ThreadToNativeFromVM transition so that the VM 34 // will not be blocked if the call takes a long time (e.g., due 35 // to a GC in the shared library). 36 class JNIAccessMark : public StackObj { 37 private: 38 ThreadToNativeFromVM _ttnfv; 39 HandleMark _hm; 40 JNIEnv* _env; 41 public: 42 inline JNIAccessMark(JVMCIEnv* jvmci_env, JavaThread* thread=JavaThread::current()) : 43 _ttnfv(thread), _hm(thread) { 44 _env = jvmci_env->_env; 45 } 46 JNIEnv* env() const { return _env; } 47 JNIEnv* operator () () const { return _env; } 48 }; 49 50 #endif // SHARE_JVMCI_JNIACCESSMARK_INLINE_HPP