001/*
002 * Copyright (c) 2009, 2015, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.nodes;
024
025import jdk.internal.jvmci.meta.*;
026
027import com.oracle.graal.compiler.common.type.*;
028import com.oracle.graal.graph.*;
029import com.oracle.graal.nodeinfo.*;
030import com.oracle.graal.nodes.spi.*;
031
032/**
033 * The {@code Parameter} instruction is a placeholder for an incoming argument to a function call.
034 */
035@NodeInfo(nameTemplate = "P({p#index})")
036public final class ParameterNode extends AbstractLocalNode implements IterableNodeType, UncheckedInterfaceProvider {
037
038    public static final NodeClass<ParameterNode> TYPE = NodeClass.create(ParameterNode.class);
039
040    public ParameterNode(int index, Stamp stamp) {
041        super(TYPE, index, stamp);
042    }
043
044    public Stamp uncheckedStamp() {
045        ResolvedJavaMethod method = graph().method();
046        if (method != null) {
047            JavaType parameterType;
048            if (method.isStatic() || index() > 0) {
049                int signatureIndex = method.isStatic() ? index() : index() - 1;
050                parameterType = method.getSignature().getParameterType(signatureIndex, method.getDeclaringClass());
051            } else {
052                parameterType = method.getDeclaringClass();
053            }
054            return UncheckedInterfaceProvider.uncheckedOrNull(parameterType, stamp());
055        }
056        return null;
057    }
058}