Mercurial > hg > truffle
view graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/nodes/PureFunctionMacroNode.java @ 11882:51059863da73
replace instanceof type tests for Canonicalizable and Simplifiable with extra boolean properties in NodeClass (GRAAL-506)
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 02 Oct 2013 20:57:11 +0200 |
parents | da9db8331658 |
children | 23ccaa863eda |
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/* * Copyright (c) 2013, 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.graal.replacements.nodes; import com.oracle.graal.api.meta.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodes.*; /** * This node class can be used to create {@link MacroNode}s for simple pure functions like * {@link System#identityHashCode(Object)}. */ public abstract class PureFunctionMacroNode extends MacroNode implements Canonicalizable { public PureFunctionMacroNode(Invoke invoke) { super(invoke); } /** * This method should return either a constant that represents the result of the function, or * null if no such result could be determined. */ protected abstract Constant evaluate(Constant param, MetaAccessProvider metaAccess); @Override public Node canonical(CanonicalizerTool tool) { if (usages().isEmpty()) { return null; } else { ValueNode param = arguments.get(0); if (param.isConstant()) { Constant constant = evaluate(param.asConstant(), tool.runtime()); if (constant != null) { return ConstantNode.forConstant(constant, tool.runtime(), graph()); } } } return this; } }