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+// BreakpointManager.java - A convenience class for dealing with breakpoints
+
+/* Copyright (C) 2006, 2007 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)
+ {
+ NormalBreakpoint bp = new NormalBreakpoint (method, location);
+ Location loc = new Location (method, location);
+ bp.install ();
+ _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);
+ Breakpoint bp = (Breakpoint) _instance._breakpoints.get (loc);
+ if (bp != null)
+ {
+ bp.remove ();
+ _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);
+ }
+}