--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.max.graal.compiler/src/com/sun/c1x/lir/LIROperand.java	Wed Jun 08 08:42:25 2011 +0200
@@ -0,0 +1,134 @@
+/*
+ * 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.sun.c1x.lir;
+
+import com.sun.cri.ci.*;
+
+/**
+ * An instruction operand. If the register allocator can modify this operand (e.g. to replace a
+ * variable with a register), then it will have a corresponding entry in the {@link LIRInstruction#allocatorOperands}
+ * list of an instruction.
+ *
+ * @author Doug Simon
+ */
+public class LIROperand {
+
+    /**
+     * The value of the operand.
+     */
+    CiValue value;
+
+    LIROperand(CiValue value) {
+        this.value = value;
+    }
+
+    /**
+     * Gets the value of this operand. This may still be a {@linkplain CiVariable}
+     * if the register allocator has not yet assigned a register or stack address to the operand.
+     *
+     * @param inst the instruction containing this operand
+     */
+    public CiValue value(LIRInstruction inst) {
+        return value;
+    }
+
+    @Override
+    public String toString() {
+        return value.toString();
+    }
+
+    static class LIRVariableOperand extends LIROperand {
+        /**
+         * Index into an instruction's {@linkplain LIRInstruction#allocatorOperands allocator operands}.
+         */
+        final int index;
+
+        LIRVariableOperand(int index) {
+            super(null);
+            this.index = index;
+        }
+
+        @Override
+        public CiValue value(LIRInstruction inst) {
+            if (value == null) {
+                CiValue value = inst.allocatorOperands.get(index);
+                if (value.isVariable()) {
+                    return value;
+                }
+                this.value = value;
+            }
+            return value;
+        }
+
+        @Override
+        public String toString() {
+            if (value == null) {
+                return "operands[" + index + "]";
+            }
+            return value.toString();
+        }
+    }
+
+    /**
+     * An address operand with at least one {@linkplain CiVariable variable} constituent.
+     */
+    static class LIRAddressOperand extends LIROperand {
+        int base;
+        int index;
+
+        LIRAddressOperand(int base, int index, CiAddress address) {
+            super(address);
+            assert base != -1 || index != -1 : "address should have at least one variable part";
+            this.base = base;
+            this.index = index;
+        }
+
+        @Override
+        public CiValue value(LIRInstruction inst) {
+            if (base != -1 || index != -1) {
+                CiAddress address = (CiAddress) value;
+                CiValue baseOperand = base == -1 ? address.base : inst.allocatorOperands.get(base);
+                CiValue indexOperand = index == -1 ? address.index : inst.allocatorOperands.get(index);
+                if (address.index.isLegal()) {
+                    assert indexOperand.isVariableOrRegister();
+                    if (baseOperand.isVariable() || indexOperand.isVariable()) {
+                        return address;
+                    }
+                } else {
+                    if (baseOperand.isVariable()) {
+                        return address;
+                    }
+                }
+                value = new CiAddress(address.kind, baseOperand, indexOperand, address.scale, address.displacement);
+                base = -1;
+                index = -1;
+            }
+            return value;
+        }
+
+        @Override
+        public String toString() {
+            return value.toString();
+        }
+    }
+}