Mercurial > hg > graal-compiler
view graal/GraalCompiler/src/com/sun/c1x/opt/UnsafeCastEliminator.java @ 2509:16b9a8b5ad39
Renamings Runtime=>GraalRuntime and Compiler=>GraalCompiler
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:50:44 +0200 |
parents | graal/Compiler/src/com/sun/c1x/opt/UnsafeCastEliminator.java@9ec15d6914ca |
children |
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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.opt; import com.sun.c1x.graph.*; import com.sun.c1x.ir.*; import com.sun.c1x.value.*; /** * A mechanism to remove {@linkplain UnsafeCast#redundant redundant} unsafe casts. * * @author Doug Simon */ public class UnsafeCastEliminator implements ValueClosure, BlockClosure { final IR ir; /** * Eliminates redundant unsafe casts from a given IR. */ public UnsafeCastEliminator(IR ir) { this.ir = ir; ir.startBlock.iterateAnyOrder(this, false); } public void apply(BlockBegin block) { if (block.isExceptionEntry()) { for (FrameState ehState : block.exceptionHandlerStates()) { ehState.valuesDo(this); } } Instruction i = block; while (i != null) { FrameState stateBefore = i.stateBefore(); if (stateBefore != null) { stateBefore.valuesDo(this); } i.inputValuesDo(this); FrameState stateAfter = i.stateAfter(); if (stateAfter != null) { stateAfter.valuesDo(this); } i = i.next(); } } public Value apply(Value i) { if (i instanceof UnsafeCast) { Value y = ((UnsafeCast) i).nonRedundantReplacement(); assert y != null; return y; } return i; } }