1 /*
   2  * Copyright (c) 2015, 2018, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package java.lang;
  26 
  27 import jdk.internal.access.JavaLangInvokeAccess;
  28 import jdk.internal.access.SharedSecrets;

  29 
  30 import java.lang.StackWalker.StackFrame;
  31 import java.lang.invoke.MethodType;
  32 
  33 class StackFrameInfo implements StackFrame {
  34     private final byte RETAIN_CLASS_REF = 0x01;
  35 
  36     private final static JavaLangInvokeAccess JLIA =
  37         SharedSecrets.getJavaLangInvokeAccess();
  38 
  39     private final byte flags;
  40     private final Object memberName;
  41     private final short bci;
  42     private volatile StackTraceElement ste;
  43 
  44     /*
  45      * Create StackFrameInfo for StackFrameTraverser and LiveStackFrameTraverser
  46      * to use



  47      */
  48     StackFrameInfo(StackWalker walker) {
  49         this.flags = walker.retainClassRef ? RETAIN_CLASS_REF : 0;
  50         this.bci = -1;
  51         this.memberName = JLIA.newMemberName();
  52     }
  53 
  54     // package-private called by StackStreamFactory to skip
  55     // the capability check
  56     Class<?> declaringClass() {
  57         return JLIA.getDeclaringClass(memberName);
  58     }
  59 
  60     // ----- implementation of StackFrame methods
  61 
  62     @Override
  63     public String getClassName() {
  64         return declaringClass().getName();
  65     }
  66 
  67     @Override
  68     public Class<?> getDeclaringClass() {
  69         ensureRetainClassRefEnabled();
  70         return declaringClass();

   1 /*
   2  * Copyright (c) 2015, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package java.lang;
  26 
  27 import jdk.internal.access.JavaLangInvokeAccess;
  28 import jdk.internal.access.SharedSecrets;
  29 import jdk.internal.vm.annotation.Stable;
  30 
  31 import java.lang.StackWalker.StackFrame;
  32 import java.lang.invoke.MethodType;
  33 
  34 class StackFrameInfo implements StackFrame {
  35     private final static byte RETAIN_CLASS_REF = 0x01;
  36 
  37     private final static JavaLangInvokeAccess JLIA =
  38         SharedSecrets.getJavaLangInvokeAccess();
  39 
  40     private final byte flags;
  41     private final Object memberName;    // MemberName initialized by VM
  42     private @Stable int bci = -1;       // BCI set by VM
  43     private volatile StackTraceElement ste;
  44 
  45     /*
  46      * Construct an empty StackFrameInfo object that will be filled by the VM
  47      * during stack walking.
  48      *
  49      * @see StackStreamFactory.AbstractStackWalker#callStackWalk
  50      * @see StackStreamFactory.AbstractStackWalker#fetchStackFrames
  51      */
  52     StackFrameInfo(StackWalker walker) {
  53         this.flags = walker.retainClassRef ? RETAIN_CLASS_REF : 0;

  54         this.memberName = JLIA.newMemberName();
  55     }
  56 
  57     // package-private called by StackStreamFactory to skip
  58     // the capability check
  59     Class<?> declaringClass() {
  60         return JLIA.getDeclaringClass(memberName);
  61     }
  62 
  63     // ----- implementation of StackFrame methods
  64 
  65     @Override
  66     public String getClassName() {
  67         return declaringClass().getName();
  68     }
  69 
  70     @Override
  71     public Class<?> getDeclaringClass() {
  72         ensureRetainClassRefEnabled();
  73         return declaringClass();