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Java example source code file (SolarisX86JavaThreadPDAccess.java)

This example Java source code file (SolarisX86JavaThreadPDAccess.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

address, addressfield, cintegerfield, jvmdebugger, object, observer, osthread, printstream, solarisx86javathreadpdaccess, threadproxy, type, util, x86currentframeguess, x86registermap, x86threadcontext

The SolarisX86JavaThreadPDAccess.java Java example source code

/*
 * Copyright (c) 2000, 2003, 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.
 *
 * 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 sun.jvm.hotspot.runtime.solaris_x86;

import java.io.*;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.debugger.x86.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.runtime.x86.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.utilities.*;

/** Placeholder for now to allow us to start the SA without support
    for stack traces */

public class SolarisX86JavaThreadPDAccess implements JavaThreadPDAccess {
  private static AddressField lastJavaFPField;
  private static AddressField osThreadField;
  private static AddressField baseOfStackPointerField;

  // Field from OSThread
  private static CIntegerField osThreadThreadIDField;

  // This is currently unneeded but is being kept in case we change
  // the currentFrameGuess algorithm
  private static final long GUESS_SCAN_RANGE = 128 * 1024;


  static {
    VM.registerVMInitializedObserver(new Observer() {
        public void update(Observable o, Object data) {
          initialize(VM.getVM().getTypeDataBase());
        }
      });
  }

  private static synchronized void initialize(TypeDataBase db) {
    Type type = db.lookupType("JavaThread");
    Type anchorType = db.lookupType("JavaFrameAnchor");

    lastJavaFPField    = anchorType.getAddressField("_last_Java_fp");
    osThreadField      = type.getAddressField("_osthread");

    type = db.lookupType("OSThread");
    osThreadThreadIDField   = type.getCIntegerField("_thread_id");
  }

  public    Address getLastJavaFP(Address addr) {
    return lastJavaFPField.getValue(addr.addOffsetTo(sun.jvm.hotspot.runtime.JavaThread.getAnchorField().getOffset()));
  }

  public    Address getLastJavaPC(Address addr) {
    return null;
  }

  public Address getBaseOfStackPointer(Address addr) {
    return null;
  }

  public Frame getLastFramePD(JavaThread thread, Address addr) {
    Address fp = thread.getLastJavaFP();
    if (fp == null) {
      return null; // no information
    }
    Address pc =  thread.getLastJavaPC();
    if ( pc != null ) {
      return new X86Frame(thread.getLastJavaSP(), fp, pc);
    } else {
      return new X86Frame(thread.getLastJavaSP(), fp);
    }
  }

  public RegisterMap newRegisterMap(JavaThread thread, boolean updateMap) {
    return new X86RegisterMap(thread, updateMap);
  }

  public Frame getCurrentFrameGuess(JavaThread thread, Address addr) {
    ThreadProxy t = getThreadProxy(addr);
    X86ThreadContext context = (X86ThreadContext) t.getContext();
    X86CurrentFrameGuess guesser = new X86CurrentFrameGuess(context, thread);
    if (!guesser.run(GUESS_SCAN_RANGE)) {
      return null;
    }
    if (guesser.getPC() == null) {
      return new X86Frame(guesser.getSP(), guesser.getFP());
    } else {
      return new X86Frame(guesser.getSP(), guesser.getFP(), guesser.getPC());
    }
  }


  public void printThreadIDOn(Address addr, PrintStream tty) {
    tty.print(getThreadProxy(addr));
  }


  public void printInfoOn(Address threadAddr, PrintStream tty) {
  }

  public Address getLastSP(Address addr) {
    ThreadProxy t = getThreadProxy(addr);
    X86ThreadContext context = (X86ThreadContext) t.getContext();
    return context.getRegisterAsAddress(X86ThreadContext.ESP);
  }

  public ThreadProxy getThreadProxy(Address addr) {
    // Fetch the OSThread (for now and for simplicity, not making a
    // separate "OSThread" class in this package)
    Address osThreadAddr = osThreadField.getValue(addr);
    // Get the address of the thread ID from the OSThread
    Address tidAddr = osThreadAddr.addOffsetTo(osThreadThreadIDField.getOffset());

    JVMDebugger debugger = VM.getVM().getDebugger();
    return debugger.getThreadForIdentifierAddress(tidAddr);
  }

}

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