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Java example source code file (ProcAddress.java)

This example Java source code file (ProcAddress.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, debuggerexception, notinheapexception, oophandle, procaddress, procdebugger, procoophandle, string, unalignedaddressexception, unimplemented, unmappedaddressexception, unsupportedoperationexception

The ProcAddress.java Java example source code

/*
 * Copyright (c) 2002, 2008, 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.proc;

import sun.jvm.hotspot.debugger.*;

class ProcAddress implements Address {
  protected ProcDebugger debugger;
  protected long addr;

  ProcAddress(ProcDebugger debugger, long addr) {
    this.debugger = debugger;
    this.addr = addr;
  }

  //
  // Basic Java routines
  //

  public boolean equals(Object arg) {
    if (arg == null) {
      return false;
    }

    if (!(arg instanceof ProcAddress)) {
      return false;
    }

    return (addr == ((ProcAddress) arg).addr);
  }

  public int hashCode() {
    // FIXME: suggestions on a better hash code?
    return (int) addr;
  }

  public String toString() {
    return debugger.addressValueToString(addr);
  }

  //
  // C/C++-related routines
  //

  public long getCIntegerAt(long offset, long numBytes, boolean isUnsigned) throws UnalignedAddressException, UnmappedAddressException {
    return debugger.readCInteger(addr + offset, numBytes, isUnsigned);
  }

  public Address getAddressAt(long offset) throws UnalignedAddressException, UnmappedAddressException {
    return debugger.readAddress(addr + offset);
  }

  public Address getCompOopAddressAt(long offset) throws UnalignedAddressException, UnmappedAddressException {
    return debugger.readCompOopAddress(addr + offset);
  }

  public Address getCompKlassAddressAt(long offset) throws UnalignedAddressException, UnmappedAddressException {
    return debugger.readCompKlassAddress(addr + offset);
  }

  //
  // Java-related routines
  //

  public boolean getJBooleanAt(long offset) throws UnalignedAddressException, UnmappedAddressException {
    return debugger.readJBoolean(addr + offset);
  }

  public byte getJByteAt(long offset) throws UnalignedAddressException, UnmappedAddressException {
    return debugger.readJByte(addr + offset);
  }

  public char getJCharAt(long offset) throws UnalignedAddressException, UnmappedAddressException {
    return debugger.readJChar(addr + offset);
  }

  public double getJDoubleAt(long offset) throws UnalignedAddressException, UnmappedAddressException {
    return debugger.readJDouble(addr + offset);
  }

  public float getJFloatAt(long offset) throws UnalignedAddressException, UnmappedAddressException {
    return debugger.readJFloat(addr + offset);
  }

  public int getJIntAt(long offset) throws UnalignedAddressException, UnmappedAddressException {
    return debugger.readJInt(addr + offset);
  }

  public long getJLongAt(long offset) throws UnalignedAddressException, UnmappedAddressException {
    return debugger.readJLong(addr + offset);
  }

  public short getJShortAt(long offset) throws UnalignedAddressException, UnmappedAddressException {
    return debugger.readJShort(addr + offset);
  }

  public OopHandle getOopHandleAt(long offset)
    throws UnalignedAddressException, UnmappedAddressException, NotInHeapException {
    return debugger.readOopHandle(addr + offset);
  }
  public OopHandle getCompOopHandleAt(long offset)
    throws UnalignedAddressException, UnmappedAddressException, NotInHeapException {
    return debugger.readCompOopHandle(addr + offset);
  }

  // Mutators -- not implemented for now (FIXME)
  public void setCIntegerAt(long offset, long numBytes, long value) {
    throw new DebuggerException("Unimplemented");
  }
  public void setAddressAt(long offset, Address value) {
    throw new DebuggerException("Unimplemented");
  }
  public void       setJBooleanAt      (long offset, boolean value)
    throws UnmappedAddressException, UnalignedAddressException {
    throw new DebuggerException("Unimplemented");
  }
  public void       setJByteAt         (long offset, byte value)
    throws UnmappedAddressException, UnalignedAddressException {
    throw new DebuggerException("Unimplemented");
  }
  public void       setJCharAt         (long offset, char value)
    throws UnmappedAddressException, UnalignedAddressException {
    throw new DebuggerException("Unimplemented");
  }
  public void       setJDoubleAt       (long offset, double value)
    throws UnmappedAddressException, UnalignedAddressException {
    throw new DebuggerException("Unimplemented");
  }
  public void       setJFloatAt        (long offset, float value)
    throws UnmappedAddressException, UnalignedAddressException {
    throw new DebuggerException("Unimplemented");
  }
  public void       setJIntAt          (long offset, int value)
    throws UnmappedAddressException, UnalignedAddressException {
    throw new DebuggerException("Unimplemented");
  }
  public void       setJLongAt         (long offset, long value)
    throws UnmappedAddressException, UnalignedAddressException {
    throw new DebuggerException("Unimplemented");
  }
  public void       setJShortAt        (long offset, short value)
    throws UnmappedAddressException, UnalignedAddressException {
    throw new DebuggerException("Unimplemented");
  }
  public void       setOopHandleAt     (long offset, OopHandle value)
    throws UnmappedAddressException, UnalignedAddressException {
    throw new DebuggerException("Unimplemented");
  }

  //
  // Arithmetic operations -- necessary evil.
  //

  public Address    addOffsetTo       (long offset) throws UnsupportedOperationException {
    long value = addr + offset;
    if (value == 0) {
      return null;
    }
    return new ProcAddress(debugger, value);
  }

  public OopHandle  addOffsetToAsOopHandle(long offset) throws UnsupportedOperationException {
    long value = addr + offset;
    if (value == 0) {
      return null;
    }
    return new ProcOopHandle(debugger, value);
  }

  /** (FIXME: any signed/unsigned issues? Should this work for
      OopHandles?) */
  public long       minus(Address arg) {
    if (arg == null) {
      return addr;
    }
    return addr - ((ProcAddress) arg).addr;
  }

  // Two's complement representation.
  // All negative numbers are larger than positive numbers.
  // Numbers with the same sign can be compared normally.
  // Test harness is below in main().

  public boolean    lessThan          (Address arg) {
    if (arg == null) {
      return false;
    }
    ProcAddress dbxArg = (ProcAddress) arg;
    if ((addr >= 0) && (dbxArg.addr < 0)) {
      return true;
    }
    if ((addr < 0) && (dbxArg.addr >= 0)) {
      return false;
    }
    return (addr < dbxArg.addr);
  }

  public boolean    lessThanOrEqual   (Address arg) {
    if (arg == null) {
      return false;
    }
    ProcAddress dbxArg = (ProcAddress) arg;
    if ((addr >= 0) && (dbxArg.addr < 0)) {
      return true;
    }
    if ((addr < 0) && (dbxArg.addr >= 0)) {
      return false;
    }
    return (addr <= dbxArg.addr);
  }

  public boolean    greaterThan       (Address arg) {
    if (arg == null) {
      return true;
    }
    ProcAddress dbxArg = (ProcAddress) arg;
    if ((addr >= 0) && (dbxArg.addr < 0)) {
      return false;
    }
    if ((addr < 0) && (dbxArg.addr >= 0)) {
      return true;
    }
    return (addr > dbxArg.addr);
  }

  public boolean    greaterThanOrEqual(Address arg) {
    if (arg == null) {
      return true;
    }
    ProcAddress dbxArg = (ProcAddress) arg;
    if ((addr >= 0) && (dbxArg.addr < 0)) {
      return false;
    }
    if ((addr < 0) && (dbxArg.addr >= 0)) {
      return true;
    }
    return (addr >= dbxArg.addr);
  }

  public Address    andWithMask(long mask) throws UnsupportedOperationException {
    long value = addr & mask;
    if (value == 0) {
      return null;
    }
    return new ProcAddress(debugger, value);
  }

  public Address    orWithMask(long mask) throws UnsupportedOperationException {
    long value = addr | mask;
    if (value == 0) {
      return null;
    }
    return new ProcAddress(debugger, value);
  }

  public Address    xorWithMask(long mask) throws UnsupportedOperationException {
    long value = addr ^ mask;
    if (value == 0) {
      return null;
    }
    return new ProcAddress(debugger, value);
  }


  //--------------------------------------------------------------------------------
  // Internals only below this point
  //

  long getValue() {
    return addr;
  }


  private static void check(boolean arg, String failMessage) {
    if (!arg) {
      System.err.println(failMessage + ": FAILED");
      System.exit(1);
    }
  }

  // Test harness
  public static void main(String[] args) {
    // p/n indicates whether the interior address is really positive
    // or negative. In unsigned terms, p1 < p2 < n1 < n2.

    ProcAddress p1 = new ProcAddress(null, 0x7FFFFFFFFFFFFFF0L);
    ProcAddress p2 = (ProcAddress) p1.addOffsetTo(10);
    ProcAddress n1 = (ProcAddress) p2.addOffsetTo(10);
    ProcAddress n2 = (ProcAddress) n1.addOffsetTo(10);

    // lessThan positive tests
    check(p1.lessThan(p2), "lessThan 1");
    check(p1.lessThan(n1), "lessThan 2");
    check(p1.lessThan(n2), "lessThan 3");
    check(p2.lessThan(n1), "lessThan 4");
    check(p2.lessThan(n2), "lessThan 5");
    check(n1.lessThan(n2), "lessThan 6");

    // lessThan negative tests
    check(!p1.lessThan(p1), "lessThan 7");
    check(!p2.lessThan(p2), "lessThan 8");
    check(!n1.lessThan(n1), "lessThan 9");
    check(!n2.lessThan(n2), "lessThan 10");

    check(!p2.lessThan(p1), "lessThan 11");
    check(!n1.lessThan(p1), "lessThan 12");
    check(!n2.lessThan(p1), "lessThan 13");
    check(!n1.lessThan(p2), "lessThan 14");
    check(!n2.lessThan(p2), "lessThan 15");
    check(!n2.lessThan(n1), "lessThan 16");

    // lessThanOrEqual positive tests
    check(p1.lessThanOrEqual(p1), "lessThanOrEqual 1");
    check(p2.lessThanOrEqual(p2), "lessThanOrEqual 2");
    check(n1.lessThanOrEqual(n1), "lessThanOrEqual 3");
    check(n2.lessThanOrEqual(n2), "lessThanOrEqual 4");

    check(p1.lessThanOrEqual(p2), "lessThanOrEqual 5");
    check(p1.lessThanOrEqual(n1), "lessThanOrEqual 6");
    check(p1.lessThanOrEqual(n2), "lessThanOrEqual 7");
    check(p2.lessThanOrEqual(n1), "lessThanOrEqual 8");
    check(p2.lessThanOrEqual(n2), "lessThanOrEqual 9");
    check(n1.lessThanOrEqual(n2), "lessThanOrEqual 10");

    // lessThanOrEqual negative tests
    check(!p2.lessThanOrEqual(p1), "lessThanOrEqual 11");
    check(!n1.lessThanOrEqual(p1), "lessThanOrEqual 12");
    check(!n2.lessThanOrEqual(p1), "lessThanOrEqual 13");
    check(!n1.lessThanOrEqual(p2), "lessThanOrEqual 14");
    check(!n2.lessThanOrEqual(p2), "lessThanOrEqual 15");
    check(!n2.lessThanOrEqual(n1), "lessThanOrEqual 16");

    // greaterThan positive tests
    check(n2.greaterThan(p1), "greaterThan 1");
    check(n2.greaterThan(p2), "greaterThan 2");
    check(n2.greaterThan(n1), "greaterThan 3");
    check(n1.greaterThan(p1), "greaterThan 4");
    check(n1.greaterThan(p2), "greaterThan 5");
    check(p2.greaterThan(p1), "greaterThan 6");

    // greaterThan negative tests
    check(!p1.greaterThan(p1), "greaterThan 7");
    check(!p2.greaterThan(p2), "greaterThan 8");
    check(!n1.greaterThan(n1), "greaterThan 9");
    check(!n2.greaterThan(n2), "greaterThan 10");

    check(!p1.greaterThan(n2), "greaterThan 11");
    check(!p2.greaterThan(n2), "greaterThan 12");
    check(!n1.greaterThan(n2), "greaterThan 13");
    check(!p1.greaterThan(n1), "greaterThan 14");
    check(!p2.greaterThan(n1), "greaterThan 15");
    check(!p1.greaterThan(p2), "greaterThan 16");

    // greaterThanOrEqual positive tests
    check(p1.greaterThanOrEqual(p1), "greaterThanOrEqual 1");
    check(p2.greaterThanOrEqual(p2), "greaterThanOrEqual 2");
    check(n1.greaterThanOrEqual(n1), "greaterThanOrEqual 3");
    check(n2.greaterThanOrEqual(n2), "greaterThanOrEqual 4");

    check(n2.greaterThanOrEqual(p1), "greaterThanOrEqual 5");
    check(n2.greaterThanOrEqual(p2), "greaterThanOrEqual 6");
    check(n2.greaterThanOrEqual(n1), "greaterThanOrEqual 7");
    check(n1.greaterThanOrEqual(p1), "greaterThanOrEqual 8");
    check(n1.greaterThanOrEqual(p2), "greaterThanOrEqual 9");
    check(p2.greaterThanOrEqual(p1), "greaterThanOrEqual 10");

    // greaterThanOrEqual negative tests
    check(!p1.greaterThanOrEqual(n2), "greaterThanOrEqual 11");
    check(!p2.greaterThanOrEqual(n2), "greaterThanOrEqual 12");
    check(!n1.greaterThanOrEqual(n2), "greaterThanOrEqual 13");
    check(!p1.greaterThanOrEqual(n1), "greaterThanOrEqual 14");
    check(!p2.greaterThanOrEqual(n1), "greaterThanOrEqual 15");
    check(!p1.greaterThanOrEqual(p2), "greaterThanOrEqual 16");

    System.err.println("ProcAddress: all tests passed successfully.");
  }
}

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