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Java example source code file (LinuxCDebugger.java)

This example Java source code file (LinuxCDebugger.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, amd64threadcontext, cframe, debuggerexception, linuxcdebugger, linuxsparccframe, list, list\/\*, loadobject, processcontrol, sparcthreadcontext, string, unsupportedoperationexception, util, x86threadcontext

The LinuxCDebugger.java Java example source code

/*
 * Copyright (c) 2003, 2012, 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.debugger.linux;

import java.io.*;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.debugger.cdbg.*;
import sun.jvm.hotspot.debugger.x86.*;
import sun.jvm.hotspot.debugger.amd64.*;
import sun.jvm.hotspot.debugger.sparc.*;
import sun.jvm.hotspot.debugger.linux.x86.*;
import sun.jvm.hotspot.debugger.linux.amd64.*;
import sun.jvm.hotspot.debugger.linux.sparc.*;
import sun.jvm.hotspot.utilities.*;

class LinuxCDebugger implements CDebugger {
  private LinuxDebugger dbg;

  LinuxCDebugger(LinuxDebugger dbg) {
    this.dbg = dbg;
  }

  public List getThreadList() throws DebuggerException {
    return dbg.getThreadList();
  }

  public List/*<LoadObject>*/ getLoadObjectList() throws DebuggerException {
    return dbg.getLoadObjectList();
  }

  public LoadObject loadObjectContainingPC(Address pc) throws DebuggerException {
    if (pc == null) {
      return null;
    }
    List objs = getLoadObjectList();
    Object[] arr = objs.toArray();
    // load objects are sorted by base address, do binary search
    int mid  = -1;
    int low  = 0;
    int high = arr.length - 1;

    while (low <= high) {
       mid = (low + high) >> 1;
       LoadObject midVal = (LoadObject) arr[mid];
       long cmp = pc.minus(midVal.getBase());
       if (cmp < 0) {
          high = mid - 1;
       } else if (cmp > 0) {
          long size = midVal.getSize();
          if (cmp >= size) {
             low = mid + 1;
          } else {
             return (LoadObject) arr[mid];
          }
       } else { // match found
          return (LoadObject) arr[mid];
       }
    }
    // no match found.
    return null;
  }

  public CFrame topFrameForThread(ThreadProxy thread) throws DebuggerException {
    String cpu = dbg.getCPU();
    if (cpu.equals("x86")) {
       X86ThreadContext context = (X86ThreadContext) thread.getContext();
       Address ebp = context.getRegisterAsAddress(X86ThreadContext.EBP);
       if (ebp == null) return null;
       Address pc  = context.getRegisterAsAddress(X86ThreadContext.EIP);
       if (pc == null) return null;
       return new LinuxX86CFrame(dbg, ebp, pc);
    } else if (cpu.equals("amd64")) {
       AMD64ThreadContext context = (AMD64ThreadContext) thread.getContext();
       Address rbp = context.getRegisterAsAddress(AMD64ThreadContext.RBP);
       if (rbp == null) return null;
       Address pc  = context.getRegisterAsAddress(AMD64ThreadContext.RIP);
       if (pc == null) return null;
       return new LinuxAMD64CFrame(dbg, rbp, pc);
    } else if (cpu.equals("sparc")) {
       SPARCThreadContext context = (SPARCThreadContext) thread.getContext();
       Address sp = context.getRegisterAsAddress(SPARCThreadContext.R_SP);
       if (sp == null) return null;
       Address pc  = context.getRegisterAsAddress(SPARCThreadContext.R_O7);
       if (pc == null) return null;
       return new LinuxSPARCCFrame(dbg, sp, pc, LinuxDebuggerLocal.getAddressSize());
    } else {
       // Runtime exception thrown by LinuxThreadContextFactory if unknown cpu
       ThreadContext context = (ThreadContext) thread.getContext();
       return context.getTopFrame(dbg);
    }
  }

  public String getNameOfFile(String fileName) {
    return new File(fileName).getName();
  }

  public ProcessControl getProcessControl() throws DebuggerException {
    // FIXME: after stabs parser
    return null;
  }

  public boolean canDemangle() {
    return false;
  }

  public String demangle(String sym) {
    throw new UnsupportedOperationException();
  }
}

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