--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.asm/src/com/oracle/max/asm/Label.java	Wed Oct 03 17:42:12 2012 +0200
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2009, 2011, 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 com.oracle.max.asm;
+
+import java.util.ArrayList;
+
+/**
+ * This class represents a label within assembly code.
+ */
+public final class Label {
+    private int position = -1;
+
+    /**
+     * References to instructions that jump to this unresolved label.
+     * These instructions need to be patched when the label is bound
+     * using the {@link #patchInstructions(AbstractAssembler)} method.
+     */
+    private ArrayList<Integer> patchPositions = new ArrayList<>(4);
+
+    /**
+     * Returns the position of this label in the code buffer.
+     * @return the position
+     */
+    public int position() {
+        assert position >= 0 : "Unbound label is being referenced";
+        return position;
+    }
+
+    public Label() {
+    }
+
+    /**
+     * Binds the label to the specified position.
+     * @param pos the position
+     */
+    protected void bind(int pos) {
+        this.position = pos;
+        assert isBound();
+    }
+
+    public boolean isBound() {
+        return position >= 0;
+    }
+
+    public void addPatchAt(int branchLocation) {
+        assert !isBound() : "Label is already bound";
+        patchPositions.add(branchLocation);
+    }
+
+    protected void patchInstructions(AbstractAssembler masm) {
+        assert isBound() : "Label should be bound";
+        int target = position;
+        for (int i = 0; i < patchPositions.size(); ++i) {
+            int pos = patchPositions.get(i);
+            masm.patchJumpTarget(pos, target);
+        }
+    }
+
+    @Override
+    public String toString() {
+        return isBound() ? String.valueOf(position()) : "?";
+    }
+}