Mercurial > hg > graal-jvmci-8
diff graal/Compiler/src/com/sun/c1x/ir/AccessIndexed.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/AccessIndexed.java Wed Apr 27 11:43:22 2011 +0200 @@ -0,0 +1,111 @@ +/* + * 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.sun.c1x.ir; + +import static com.sun.c1x.ir.Value.Flag.*; + +import com.sun.c1x.value.*; +import com.sun.cri.ci.*; + +/** + * The {@code AccessIndexed} class is the base class of instructions that read or write + * elements of an array. + * + * @author Ben L. Titzer + */ +public abstract class AccessIndexed extends AccessArray { + + private Value index; + private Value length; + private final CiKind elementType; + + /** + * Create an new AccessIndexed instruction. + * @param kind the result kind of the access + * @param array the instruction producing the array + * @param index the instruction producing the index + * @param length the instruction producing the length (used in bounds check elimination?) + * @param elementType the type of the elements of the array + * @param stateBefore the state before executing this instruction + */ + AccessIndexed(CiKind kind, Value array, Value index, Value length, CiKind elementType, FrameState stateBefore) { + super(kind, array, stateBefore); + this.index = index; + this.length = length; + this.elementType = elementType; + } + + /** + * Gets the instruction producing the index into the array. + * @return the index + */ + public Value index() { + return index; + } + + /** + * Gets the instruction that produces the length of the array. + * @return the length + */ + public Value length() { + return length; + } + + /** + * Gets the element type of the array. + * @return the element type + */ + public CiKind elementKind() { + return elementType; + } + + /** + * Checks whether this instruction needs a bounds check. + * @return {@code true} if a bounds check is needed + */ + public boolean needsBoundsCheck() { + return !checkFlag(NoBoundsCheck); + } + + public void eliminateBoundsCheck() { + clearRuntimeCheck(NoBoundsCheck); + } + + /** + * Checks whether this instruction can cause a trap. + * @return {@code true} if this instruction can cause a trap + */ + @Override + public boolean canTrap() { + return needsNullCheck() || needsBoundsCheck(); + } + + @Override + public void inputValuesDo(ValueClosure closure) { + super.inputValuesDo(closure); + index = closure.apply(index); + if (length != null) { + length = closure.apply(length); + } + } +}