author | coleenp |
Wed, 08 Aug 2018 15:24:21 -0400 | |
changeset 51338 | aa3bfacc912c |
parent 50803 | 45c1fde86050 |
child 53060 | 7aa1a37b04a2 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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|
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#ifndef SHARE_RUNTIME_JNIHANDLES_INLINE_HPP |
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#define SHARE_RUNTIME_JNIHANDLES_INLINE_HPP |
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#include "oops/access.inline.hpp" |
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#include "oops/oop.hpp" |
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#include "runtime/jniHandles.hpp" |
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#include "utilities/debug.hpp" |
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#include "utilities/globalDefinitions.hpp" |
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inline bool JNIHandles::is_jweak(jobject handle) { |
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STATIC_ASSERT(weak_tag_size == 1); |
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STATIC_ASSERT(weak_tag_value == 1); |
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return (reinterpret_cast<uintptr_t>(handle) & weak_tag_mask) != 0; |
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} |
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inline oop* JNIHandles::jobject_ptr(jobject handle) { |
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assert(!is_jweak(handle), "precondition"); |
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return reinterpret_cast<oop*>(handle); |
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} |
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inline oop* JNIHandles::jweak_ptr(jobject handle) { |
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assert(is_jweak(handle), "precondition"); |
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char* ptr = reinterpret_cast<char*>(handle) - weak_tag_value; |
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return reinterpret_cast<oop*>(ptr); |
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} |
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// external_guard is true if called from resolve_external_guard. |
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template<bool external_guard> |
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inline oop JNIHandles::resolve_impl(jobject handle) { |
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assert(handle != NULL, "precondition"); |
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assert(!current_thread_in_native(), "must not be in native"); |
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oop result; |
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if (is_jweak(handle)) { // Unlikely |
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result = resolve_jweak(handle); |
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} else { |
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result = NativeAccess<>::oop_load(jobject_ptr(handle)); |
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// Construction of jobjects canonicalize a null value into a null |
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// jobject, so for non-jweak the pointee should never be null. |
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assert(external_guard || result != NULL, "Invalid JNI handle"); |
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} |
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return result; |
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} |
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inline oop JNIHandles::resolve(jobject handle) { |
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oop result = NULL; |
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if (handle != NULL) { |
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result = resolve_impl<false /* external_guard */ >(handle); |
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} |
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return result; |
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} |
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inline oop JNIHandles::resolve_non_null(jobject handle) { |
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assert(handle != NULL, "JNI handle should not be null"); |
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oop result = resolve_impl<false /* external_guard */ >(handle); |
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assert(result != NULL, "NULL read from jni handle"); |
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return result; |
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} |
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inline void JNIHandles::destroy_local(jobject handle) { |
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if (handle != NULL) { |
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assert(!is_jweak(handle), "Invalid JNI local handle"); |
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NativeAccess<>::oop_store(jobject_ptr(handle), (oop)NULL); |
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} |
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} |
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#endif // SHARE_RUNTIME_JNIHANDLES_INLINE_HPP |
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