Mercurial > hg > graal-jvmci-8
diff 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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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/Compiler/src/com/sun/c1x/ir/UnsafeCast.java Wed Apr 27 11:43:22 2011 +0200 @@ -0,0 +1,117 @@ +/* + * 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)); + } +}