--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.max.graal.compiler/src/com/oracle/max/graal/compiler/ir/Instruction.java	Wed Jun 08 08:59:54 2011 +0200
@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) 2009, 2010, 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.graal.compiler.ir;
+
+import java.util.*;
+
+import com.oracle.max.graal.compiler.*;
+import com.oracle.max.graal.compiler.value.*;
+import com.oracle.max.graal.graph.*;
+import com.sun.cri.ci.*;
+
+/**
+ * Denotes an instruction node in the IR, which is a {@link Value} that
+ * can be added to a basic block (whereas other {@link Value} nodes such as {@link Phi} and
+ * {@link Local} cannot be added to basic blocks).
+ *
+ * Subclasses of instruction represent arithmetic and object operations,
+ * control flow operators, phi statements, method calls, the start of basic blocks, and
+ * the end of basic blocks.
+ *
+ * Instruction nodes are chained together in a basic block through the embedded
+ * {@link Instruction#next} field. An Instruction may also have a list of {@link ExceptionHandler}s.
+ */
+public abstract class Instruction extends FixedNode {
+
+    private static final int INPUT_COUNT = 0;
+
+    private static final int SUCCESSOR_COUNT = 1;
+    public static final int SUCCESSOR_NEXT = 0;
+
+    @Override
+    protected int inputCount() {
+        return super.inputCount() + INPUT_COUNT;
+    }
+
+    @Override
+    protected int successorCount() {
+        return super.successorCount() + SUCCESSOR_COUNT;
+    }
+
+    /**
+     * Links to next instruction in a basic block, to {@code null} if this instruction is the end of a basic block or to
+     * itself if not in a block.
+     */
+    public Instruction next() {
+        return (Instruction) successors().get(super.successorCount() + SUCCESSOR_NEXT);
+    }
+
+    public Node setNext(Instruction next) {
+        return successors().set(super.successorCount() + SUCCESSOR_NEXT, next);
+    }
+
+    public int nextIndex() {
+        return super.successorCount() + SUCCESSOR_NEXT;
+    }
+
+
+    public static final int SYNCHRONIZATION_ENTRY_BCI = -1;
+
+    /**
+     * Constructs a new instruction with the specified value type.
+     * @param kind the value type for this instruction
+     * @param inputCount
+     * @param successorCount
+     */
+    public Instruction(CiKind kind, int inputCount, int successorCount, Graph graph) {
+        super(kind, inputCount + INPUT_COUNT, successorCount + SUCCESSOR_COUNT, graph);
+        C1XMetrics.HIRInstructions++;
+    }
+
+
+    /**
+     * Gets the list of predecessors of this block.
+     * @return the predecessor list
+     */
+    @SuppressWarnings({ "unchecked", "rawtypes" })
+    public List<Instruction> blockPredecessors() {
+        return (List) Collections.unmodifiableList(predecessors());
+    }
+
+    /**
+     * Get the number of predecessors.
+     * @return the number of predecessors
+     */
+    public int numberOfPreds() {
+        return predecessors().size();
+    }
+
+    public Instruction predAt(int j) {
+        return (Instruction) predecessors().get(j);
+    }
+
+    /**
+     * Gets the state after the instruction, if it is recorded.
+     * @return the state after the instruction
+     */
+    public FrameState stateAfter() {
+        return null;
+    }
+}