--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/CallingConvention.java	Wed May 27 00:36:16 2015 +0200
@@ -0,0 +1,159 @@
+/*
+ * Copyright (c) 2009, 2012, 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.jvmci.code;
+
+import com.oracle.jvmci.meta.Value;
+import com.oracle.jvmci.meta.AllocatableValue;
+import static com.oracle.jvmci.code.ValueUtil.*;
+
+
+/**
+ * A calling convention describes the locations in which the arguments for a call are placed and the
+ * location in which the return value is placed if the call is not void.
+ */
+public class CallingConvention {
+
+    /**
+     * Constants denoting the type of a call for which a calling convention is requested.
+     */
+    public enum Type {
+        /**
+         * A request for the outgoing argument locations at a call site to Java code.
+         */
+        JavaCall(true),
+
+        /**
+         * A request for the incoming argument locations.
+         */
+        JavaCallee(false),
+
+        /**
+         * A request for the outgoing argument locations at a call site to external native code that
+         * complies with the platform ABI.
+         */
+        NativeCall(true);
+
+        /**
+         * Determines if this is a request for the outgoing argument locations at a call site.
+         */
+        public final boolean out;
+
+        public static final Type[] VALUES = values();
+
+        private Type(boolean out) {
+            this.out = out;
+        }
+    }
+
+    /**
+     * The amount of stack space (in bytes) required for the stack-based arguments of the call.
+     */
+    private final int stackSize;
+
+    private final AllocatableValue returnLocation;
+
+    /**
+     * The ordered locations in which the arguments are placed.
+     */
+    private final AllocatableValue[] argumentLocations;
+
+    /**
+     * Creates a description of the registers and stack locations used by a call.
+     *
+     * @param stackSize amount of stack space (in bytes) required for the stack-based arguments of
+     *            the call
+     * @param returnLocation the location for the return value or {@link Value#ILLEGAL} if a void
+     *            call
+     * @param argumentLocations the ordered locations in which the arguments are placed
+     */
+    public CallingConvention(int stackSize, AllocatableValue returnLocation, AllocatableValue... argumentLocations) {
+        assert argumentLocations != null;
+        assert returnLocation != null;
+        this.argumentLocations = argumentLocations;
+        this.stackSize = stackSize;
+        this.returnLocation = returnLocation;
+        assert verify();
+    }
+
+    /**
+     * Gets the location for the return value or {@link Value#ILLEGAL} if a void call.
+     */
+    public AllocatableValue getReturn() {
+        return returnLocation;
+    }
+
+    /**
+     * Gets the location for the {@code index}'th argument.
+     */
+    public AllocatableValue getArgument(int index) {
+        return argumentLocations[index];
+    }
+
+    /**
+     * Gets the amount of stack space (in bytes) required for the stack-based arguments of the call.
+     */
+    public int getStackSize() {
+        return stackSize;
+    }
+
+    /**
+     * Gets the number of locations required for the arguments.
+     */
+    public int getArgumentCount() {
+        return argumentLocations.length;
+    }
+
+    /**
+     * Gets the locations required for the arguments.
+     */
+    public AllocatableValue[] getArguments() {
+        if (argumentLocations.length == 0) {
+            return argumentLocations;
+        }
+        return argumentLocations.clone();
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append("CallingConvention[");
+        String sep = "";
+        for (Value op : argumentLocations) {
+            sb.append(sep).append(op);
+            sep = ", ";
+        }
+        if (!returnLocation.equals(Value.ILLEGAL)) {
+            sb.append(" -> ").append(returnLocation);
+        }
+        sb.append("]");
+        return sb.toString();
+    }
+
+    private boolean verify() {
+        for (int i = 0; i < argumentLocations.length; i++) {
+            Value location = argumentLocations[i];
+            assert isStackSlot(location) || isAllocatableValue(location);
+        }
+        return true;
+    }
+}