Mercurial > hg > truffle
diff graal/com.oracle.max.graal.nodes/src/com/oracle/max/graal/nodes/extended/ValueAnchorNode.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
parents | |
children | aaac4894175c |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.max.graal.nodes/src/com/oracle/max/graal/nodes/extended/ValueAnchorNode.java Sat Dec 17 19:59:18 2011 +0100 @@ -0,0 +1,73 @@ +/* + * Copyright (c) 2011, 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.nodes.extended; + +import com.oracle.max.graal.graph.*; +import com.oracle.max.graal.nodes.*; +import com.oracle.max.graal.nodes.calc.*; +import com.oracle.max.graal.nodes.spi.*; +import com.oracle.max.graal.nodes.type.*; +import com.sun.cri.ci.*; + +/** + * The ValueAnchor instruction keeps non-CFG (floating) nodes above a certain point in the graph. + */ + +public final class ValueAnchorNode extends FixedWithNextNode implements Canonicalizable, LIRLowerable { + + @Input private ValueNode object; + + public ValueNode object() { + return object; + } + + public ValueAnchorNode(ValueNode object) { + super(StampFactory.illegal()); + this.object = object; + } + + @Override + public void generate(LIRGeneratorTool gen) { + // Nothing to emit, since this is node is used for structural purposes only. + } + + @Override + public Node canonical(CanonicalizerTool tool) { + if (object == null) { + return next(); + } + if (object instanceof ConstantNode) { + return next(); + } + if (object instanceof IntegerDivNode || object instanceof IntegerRemNode) { + if (((ArithmeticNode) object).y().isConstant()) { + CiConstant constant = ((ArithmeticNode) object).y().asConstant(); + assert constant.kind == object.kind() : constant.kind + " != " + object.kind(); + if (constant.asLong() != 0) { + return next(); + } + } + } + return this; + } +}