author | mchung |
Fri, 29 Sep 2017 11:33:08 -0700 | |
changeset 47294 | 7d67bb6b0599 |
parent 47216 | 71c04702a3d5 |
child 47818 | 2f6ab27efb60 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 2016, 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. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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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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package java.lang; |
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import jdk.internal.misc.JavaLangInvokeAccess; |
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import jdk.internal.misc.SharedSecrets; |
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import static java.lang.StackWalker.Option.*; |
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import java.lang.StackWalker.StackFrame; |
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import java.lang.invoke.MethodType; |
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class StackFrameInfo implements StackFrame { |
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private final static JavaLangInvokeAccess JLIA = |
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SharedSecrets.getJavaLangInvokeAccess(); |
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// Footprint improvement: MemberName::clazz can replace |
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// StackFrameInfo::declaringClass. |
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private final StackWalker walker; |
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private final Class<?> declaringClass; |
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private final Object memberName; |
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private final short bci; |
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private volatile StackTraceElement ste; |
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/* |
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* Create StackFrameInfo for StackFrameTraverser and LiveStackFrameTraverser |
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* to use |
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*/ |
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StackFrameInfo(StackWalker walker) { |
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this.walker = walker; |
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this.declaringClass = null; |
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this.bci = -1; |
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this.memberName = JLIA.newMemberName(); |
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} |
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// package-private called by StackStreamFactory to skip |
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// the capability check |
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Class<?> declaringClass() { |
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return declaringClass; |
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} |
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// ----- implementation of StackFrame methods |
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@Override |
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public String getClassName() { |
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return declaringClass.getName(); |
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} |
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@Override |
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public Class<?> getDeclaringClass() { |
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walker.ensureAccessEnabled(RETAIN_CLASS_REFERENCE); |
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return declaringClass; |
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} |
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@Override |
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public String getMethodName() { |
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return JLIA.getName(memberName); |
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} |
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@Override |
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public MethodType getMethodType() { |
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walker.ensureAccessEnabled(RETAIN_CLASS_REFERENCE); |
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return JLIA.getMethodType(memberName); |
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} |
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@Override |
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public String getDescriptor() { |
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return JLIA.getMethodDescriptor(memberName); |
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} |
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@Override |
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public int getByteCodeIndex() { |
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// bci not available for native methods |
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if (isNativeMethod()) |
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return -1; |
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return bci; |
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} |
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@Override |
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public String getFileName() { |
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return toStackTraceElement().getFileName(); |
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} |
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@Override |
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public int getLineNumber() { |
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// line number not available for native methods |
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if (isNativeMethod()) |
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return -2; |
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return toStackTraceElement().getLineNumber(); |
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} |
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@Override |
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public boolean isNativeMethod() { |
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return JLIA.isNative(memberName); |
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} |
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@Override |
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public String toString() { |
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return toStackTraceElement().toString(); |
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} |
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public StackTraceElement toStackTraceElement() { |
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StackTraceElement s = ste; |
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if (s == null) { |
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synchronized (this) { |
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s = ste; |
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if (s == null) { |
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ste = s = StackTraceElement.of(this); |
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} |
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} |
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} |
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return s; |
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} |
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} |