Mercurial > hg > graal-compiler
comparison graal/Compiler/src/com/sun/c1x/opt/UnsafeCastEliminator.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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2506:4a3bf8a5bf41 | 2507:9ec15d6914ca |
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1 /* | |
2 * Copyright (c) 2010, 2011, Oracle and/or its affiliates. All rights reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 */ | |
23 package com.sun.c1x.opt; | |
24 | |
25 import com.sun.c1x.graph.*; | |
26 import com.sun.c1x.ir.*; | |
27 import com.sun.c1x.value.*; | |
28 | |
29 /** | |
30 * A mechanism to remove {@linkplain UnsafeCast#redundant redundant} unsafe casts. | |
31 * | |
32 * @author Doug Simon | |
33 */ | |
34 public class UnsafeCastEliminator implements ValueClosure, BlockClosure { | |
35 | |
36 final IR ir; | |
37 | |
38 /** | |
39 * Eliminates redundant unsafe casts from a given IR. | |
40 */ | |
41 public UnsafeCastEliminator(IR ir) { | |
42 this.ir = ir; | |
43 ir.startBlock.iterateAnyOrder(this, false); | |
44 } | |
45 | |
46 public void apply(BlockBegin block) { | |
47 if (block.isExceptionEntry()) { | |
48 for (FrameState ehState : block.exceptionHandlerStates()) { | |
49 ehState.valuesDo(this); | |
50 } | |
51 } | |
52 | |
53 Instruction i = block; | |
54 while (i != null) { | |
55 FrameState stateBefore = i.stateBefore(); | |
56 if (stateBefore != null) { | |
57 stateBefore.valuesDo(this); | |
58 } | |
59 i.inputValuesDo(this); | |
60 FrameState stateAfter = i.stateAfter(); | |
61 if (stateAfter != null) { | |
62 stateAfter.valuesDo(this); | |
63 } | |
64 i = i.next(); | |
65 } | |
66 } | |
67 | |
68 public Value apply(Value i) { | |
69 if (i instanceof UnsafeCast) { | |
70 Value y = ((UnsafeCast) i).nonRedundantReplacement(); | |
71 assert y != null; | |
72 return y; | |
73 } | |
74 return i; | |
75 } | |
76 } |