1 /*
   2  * Copyright (c) 2001, 2002, 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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores,
  20  * CA 94065 USA or visit www.oracle.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.bugspot;
  26 
  27 import sun.jvm.hotspot.debugger.cdbg.*;
  28 import sun.jvm.hotspot.oops.*;
  29 import sun.jvm.hotspot.runtime.*;
  30 
  31 /** This class describes a frame in a stack trace. It abstracts over
  32     C/C++ and Java frames. */
  33 
  34 public class StackTraceEntry {
  35   private CFrame cFrame;
  36   private CDebugger dbg;
  37   private JavaVFrame javaFrame;
  38   private String value; // What is displayed in a stack trace
  39   // For merging C and Java stack traces.
  40   // For more precise stack traces, should probably have a way to
  41   // convert a CFrame to a sun.jvm.hotspot.runtime.Frame. For now,
  42   // doing similar algorithm to jdbx (which does not have intimate
  43   // knowledge of the VM).
  44   private boolean isUnknownCFrame;
  45 
  46   public StackTraceEntry(CFrame cFrame, CDebugger dbg) {
  47     this.cFrame = cFrame;
  48     this.dbg = dbg;
  49     computeValue();
  50   }
  51 
  52   public StackTraceEntry(JavaVFrame javaFrame) {
  53     this.javaFrame = javaFrame;
  54     computeValue();
  55   }
  56 
  57   public boolean    isCFrame()     { return (cFrame != null);    }
  58   public boolean    isJavaFrame()  { return (javaFrame != null); }
  59   public CFrame     getCFrame()    { return cFrame;              }
  60   public JavaVFrame getJavaFrame() { return javaFrame;           }
  61   public boolean    isUnknownCFrame() { return isUnknownCFrame;  }
  62   public String toString() {
  63     return value;
  64   }
  65 
  66   private void computeValue() {
  67     isUnknownCFrame = true;
  68     value = "<unknown>";
  69     if (cFrame != null) {
  70       PCFinder.Info info = PCFinder.findPC(cFrame.pc(), cFrame.loadObjectForPC(), dbg);
  71       if (info.getName() != null) {
  72         value = "(C) " + info.getName();
  73         isUnknownCFrame = false;
  74         if (info.getConfidence() == PCFinder.LOW_CONFIDENCE) {
  75           value = value + " (?)";
  76         }
  77         if (info.getOffset() >= 0) {
  78           value = value + " + 0x" + Long.toHexString(info.getOffset());
  79         }
  80       }
  81     } else if (javaFrame != null) {
  82       isUnknownCFrame = false;
  83       Method m = javaFrame.getMethod();
  84       value = "(J) " + m.externalNameAndSignature();
  85     }
  86   }
  87 }