Mercurial > hg > truffle
view graal/Compiler/src/com/sun/c1x/ir/UnsafeCast.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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/* * Copyright (c) 2010, 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.sun.c1x.ir; import com.sun.c1x.debug.*; import com.sun.cri.bytecode.*; import com.sun.cri.ci.*; import com.sun.cri.ri.*; /** * The {@code UnsafeCast} instruction represents a {@link Bytecodes#UNSAFE_CAST}. * * @author Doug Simon */ public final class UnsafeCast extends Instruction { public final RiType toType; /** * The instruction that produced the value being unsafe cast. */ private Value value; /** * Denotes if this is a redundant cast at the machine level. That is the source * and the destination kind are implemented by the same machine kind. */ public final boolean redundant; /** * Creates a new UnsafeCast instruction. * * @param toType the the being cast to * @param value the value being cast */ public UnsafeCast(RiType toType, Value value, boolean redundant) { super(toType.kind().stackKind()); this.toType = toType; this.value = value; this.redundant = redundant; } /** * Gets the first non-redundant value derived from this value. If this * value is not {@linkplain #redundant}, then it is returned. Otherwise, * the first value found by following {@link #value()} that is not an * unsafe cast or is not redundant is returned. */ public Value nonRedundantReplacement() { if (!redundant) { return this; } if (!(value instanceof UnsafeCast)) { return value; } return ((UnsafeCast) value).nonRedundantReplacement(); } /** * Gets the instruction that produced the value being unsafe cast. */ public Value value() { return value; } @Override public RiType declaredType() { return toType; } @Override public RiType exactType() { return declaredType().exactType(); } @Override public void accept(ValueVisitor v) { v.visitUnsafeCast(this); } /** * Iterates over the input values to this instruction. * @param closure the closure to apply */ @Override public void inputValuesDo(ValueClosure closure) { value = closure.apply(value); } @Override public void print(LogStream out) { out.print("unsafe_cast("). print(value). print(") "). print(CiUtil.toJavaName(toType)); } }