Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/ValueAnchorNode.java @ 8345:4e7a668054ea
added field to ValueAnchorNode to prevent canonicalization and virtualization; used new field to fix issue with return value materialization floating below the final monitorexit of a synchronized method
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 18 Mar 2013 18:06:33 +0100 |
parents | 7d6cee014fb8 |
children | ae815a4c112a |
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/* * 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.graal.nodes.extended; import static com.oracle.graal.graph.iterators.NodePredicates.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.graph.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.calc.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; /** * The ValueAnchor instruction keeps non-CFG (floating) nodes above a certain point in the graph. */ public final class ValueAnchorNode extends FixedWithNextNode implements Canonicalizable, LIRLowerable, Node.IterableNodeType, Virtualizable { public ValueAnchorNode(ValueNode... values) { this(false, values); } public ValueAnchorNode(boolean permanent, ValueNode... values) { super(StampFactory.dependency(), values); this.permanent = permanent; } private final boolean permanent; @Override public void generate(LIRGeneratorTool gen) { // Nothing to emit, since this node is used for structural purposes only. } public void addAnchoredNode(ValueNode value) { if (!this.dependencies().contains(value)) { this.dependencies().add(value); } } @Override public ValueNode canonical(CanonicalizerTool tool) { if (permanent) { return this; } if (this.predecessor() instanceof ValueAnchorNode) { ValueAnchorNode previousAnchor = (ValueAnchorNode) this.predecessor(); if (previousAnchor.usages().isEmpty()) { // avoid creating cycles // transfer values and remove for (ValueNode node : dependencies().nonNull().distinct()) { previousAnchor.addAnchoredNode(node); } return previousAnchor; } } for (Node node : dependencies().nonNull().and(isNotA(FixedNode.class))) { if (node instanceof ConstantNode) { continue; } if (node instanceof IntegerDivNode || node instanceof IntegerRemNode) { ArithmeticNode arithmeticNode = (ArithmeticNode) node; if (arithmeticNode.y().isConstant()) { Constant constant = arithmeticNode.y().asConstant(); assert constant.getKind() == arithmeticNode.kind() : constant.getKind() + " != " + arithmeticNode.kind(); if (constant.asLong() != 0) { continue; } } } return this; // still necessary } if (usages().isEmpty()) { return null; // no node which require an anchor found } return this; } @Override public void virtualize(VirtualizerTool tool) { if (permanent) { return; } for (ValueNode node : dependencies().nonNull().and(isNotA(BeginNode.class))) { State state = tool.getObjectState(node); if (state == null || state.getState() != EscapeState.Virtual) { return; } } tool.delete(); } }