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// BreakpointManager.java - A convenience class for dealing with breakpoints
/* Copyright (C) 2006 Free Software Foundation
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package gnu.gcj.jvmti;
import java.util.Hashtable;
/**
* A class which manages breakpoints in the VM interpreter engine.
*
* BreakpointManager is a location manager that the interpreter
* uses to lookup the original instruction for any given installed
* breakpoint. JVMTI does not allow multiple breakpoints to be set
* at any given location.
*
* @author Keith Seitz (keiths@redhat.com)
*/
public class BreakpointManager
{
private static BreakpointManager _instance = new BreakpointManager ();
// List of breakpoints indexed by Location
private Hashtable _breakpoints;
private BreakpointManager ()
{
_breakpoints = new Hashtable ();
}
/**
* Creates a new breakpoint. SetBreakpoint will verify the validity
* of the arguments.
*
* @param method method in which to set breakpoint (a jmethodID)
* @param location index where the breakpoint is to be set (a jlocation)
*/
public static Breakpoint newBreakpoint (long method, long location)
{
Breakpoint bp = new Breakpoint (method, location);
Location loc = new Location (method, location);
_instance._breakpoints.put (loc, bp);
return bp;
}
/**
* Deletes the breakpoint at the given Location
*
* @param method method in which to clear breakpoint
* @param location index of breakpoint in method
*/
public static void deleteBreakpoint (long method, long location)
{
Location loc = new Location (method, location);
_instance._breakpoints.remove (loc);
}
/**
* Returns the breakpoint at the given location or null if none installed
* at location
*
* @param method the jmethodID of the breakpoint location
* @param location the index in the method
*/
public static Breakpoint getBreakpoint (long method, long location)
{
Location loc = new Location (method, location);
return (Breakpoint) _instance._breakpoints.get (loc);
}
}
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