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Diffstat (limited to 'libjava/gnu/gcj/jvmti/BreakpointManager.java')
-rw-r--r-- | libjava/gnu/gcj/jvmti/BreakpointManager.java | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/libjava/gnu/gcj/jvmti/BreakpointManager.java b/libjava/gnu/gcj/jvmti/BreakpointManager.java new file mode 100644 index 00000000000..205bf6d8a5b --- /dev/null +++ b/libjava/gnu/gcj/jvmti/BreakpointManager.java @@ -0,0 +1,76 @@ +// 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); + } +} |