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view graal/com.oracle.max.graal.compiler/src/com/oracle/max/graal/compiler/ir/IsType.java @ 3032:2433838f0414
Create null checks as guard nodes.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Mon, 20 Jun 2011 15:14:36 +0200 |
parents | f00918f35c7f |
children | ce12808b8ff2 |
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/* * Copyright (c) 2009, 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.compiler.ir; import java.util.*; import com.oracle.max.graal.compiler.debug.*; import com.oracle.max.graal.compiler.util.*; import com.oracle.max.graal.graph.*; import com.sun.cri.bytecode.*; import com.sun.cri.ci.*; import com.sun.cri.ri.*; /** * The {@code TypeCheck} class represents an explicit type check instruction. */ public final class IsType extends BooleanNode { private static final int INPUT_COUNT = 1; private static final int INPUT_OBJECT = 0; private static final int SUCCESSOR_COUNT = 0; @Override protected int inputCount() { return super.inputCount() + INPUT_COUNT; } @Override protected int successorCount() { return super.successorCount() + SUCCESSOR_COUNT; } /** * The instruction that produces the object tested against null. */ public Value object() { return (Value) inputs().get(super.inputCount() + INPUT_OBJECT); } public Value setObject(Value n) { return (Value) inputs().set(super.inputCount() + INPUT_OBJECT, n); } private final RiType type; /** * Constructs a new IsType instruction. * @param object the instruction producing the object to check against the given type * @param graph */ public IsType(Value object, RiType type, Graph graph) { super(CiKind.Object, INPUT_COUNT, SUCCESSOR_COUNT, graph); assert type.isResolved(); assert object == null || object.kind == CiKind.Object; this.type = type; setObject(object); } public RiType type() { return type; } @Override public void accept(ValueVisitor v) { // Nothing to do. } @Override public int valueNumber() { return Util.hash1(Bytecodes.CHECKCAST, object()); } @Override public boolean valueEqual(Node i) { if (i instanceof IsType) { IsType o = (IsType) i; return type == o.type() && object() == o.object(); } return false; } @Override public RiType declaredType() { // type check does not alter the type of the object return object().declaredType(); } @Override public RiType exactType() { return type; } @Override public void print(LogStream out) { out.print("null_check(").print(object()).print(')'); } @Override public Map<Object, Object> getDebugProperties() { Map<Object, Object> properties = super.getDebugProperties(); properties.put("type", type); return properties; } @Override public Node copy(Graph into) { return new IsType(null, type, into); } }