129 lines
3.7 KiB
Java
129 lines
3.7 KiB
Java
/*
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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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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 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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@Override
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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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}
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