| /* |
| * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package java.lang; |
| |
| import jdk.internal.misc.JavaLangInvokeAccess; |
| import jdk.internal.misc.SharedSecrets; |
| |
| import static java.lang.StackWalker.Option.*; |
| import java.lang.StackWalker.StackFrame; |
| |
| class StackFrameInfo implements StackFrame { |
| private final static JavaLangInvokeAccess JLIA = |
| SharedSecrets.getJavaLangInvokeAccess(); |
| |
| // Footprint improvement: MemberName::clazz can replace |
| // StackFrameInfo::declaringClass. |
| |
| private final StackWalker walker; |
| private final Class<?> declaringClass; |
| private final Object memberName; |
| private final short bci; |
| private volatile StackTraceElement ste; |
| |
| /* |
| * Create StackFrameInfo for StackFrameTraverser and LiveStackFrameTraverser |
| * to use |
| */ |
| StackFrameInfo(StackWalker walker) { |
| this.walker = walker; |
| this.declaringClass = null; |
| this.bci = -1; |
| this.memberName = JLIA.newMemberName(); |
| } |
| |
| // package-private called by StackStreamFactory to skip |
| // the capability check |
| Class<?> declaringClass() { |
| return declaringClass; |
| } |
| |
| // ----- implementation of StackFrame methods |
| |
| @Override |
| public String getClassName() { |
| return declaringClass.getName(); |
| } |
| |
| @Override |
| public Class<?> getDeclaringClass() { |
| walker.ensureAccessEnabled(RETAIN_CLASS_REFERENCE); |
| return declaringClass; |
| } |
| |
| @Override |
| public String getMethodName() { |
| return JLIA.getName(memberName); |
| } |
| |
| @Override |
| public int getByteCodeIndex() { |
| // bci not available for native methods |
| if (isNativeMethod()) |
| return -1; |
| |
| return bci; |
| } |
| |
| @Override |
| public String getFileName() { |
| return toStackTraceElement().getFileName(); |
| } |
| |
| @Override |
| public int getLineNumber() { |
| // line number not available for native methods |
| if (isNativeMethod()) |
| return -2; |
| |
| return toStackTraceElement().getLineNumber(); |
| } |
| |
| |
| @Override |
| public boolean isNativeMethod() { |
| return JLIA.isNative(memberName); |
| } |
| |
| @Override |
| public String toString() { |
| return toStackTraceElement().toString(); |
| } |
| |
| @Override |
| public StackTraceElement toStackTraceElement() { |
| StackTraceElement s = ste; |
| if (s == null) { |
| synchronized (this) { |
| s = ste; |
| if (s == null) { |
| ste = s = StackTraceElement.of(this); |
| } |
| } |
| } |
| return s; |
| } |
| } |