Mercurial > hg > graal-jvmci-8
comparison graal/Compiler/src/com/sun/c1x/opt/TypeAnalyzer.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) 2009, 2010, 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.IR; | |
26 import com.sun.cri.ri.*; | |
27 | |
28 /** | |
29 * This class implements an iterative, flow-sensitve type analysis that can be | |
30 * used to remove redundant checkcasts and instanceof tests as well as devirtualize | |
31 * and deinterface method calls. | |
32 * | |
33 * @author Ben L. Titzer | |
34 */ | |
35 public class TypeAnalyzer { | |
36 | |
37 final IR ir; | |
38 | |
39 public TypeAnalyzer(IR ir) { | |
40 this.ir = ir; | |
41 } | |
42 | |
43 // type information sources: | |
44 // new, anewarray, newarray | |
45 // parameter types | |
46 // instanceof | |
47 // checkcast | |
48 // array stores | |
49 // array loads | |
50 // field loads | |
51 // exception handler type | |
52 // equality comparison | |
53 // call to Object.clone() | |
54 // call to Class.newInstance() | |
55 // call to Array.newInstance() | |
56 // call to Class.isInstance() | |
57 | |
58 // possible optimizations: | |
59 // remove redundant checkcasts | |
60 // fold instanceof tests | |
61 // remove dead branches in folded instanceof | |
62 // detect redundant store checks | |
63 // convert invokeinterface to invokevirtual when possible | |
64 // convert invokevirtual to invokespecial when possible | |
65 // remove finalizer checks | |
66 // specialize array copy calls | |
67 // transform reflective Class.newInstance() into allocation | |
68 // transform reflective Array.newInstance() into allocation | |
69 // transform reflective Class.isInstance() to checkcast | |
70 // transform reflective method invocation to direct method invocation | |
71 | |
72 private static class TypeApprox { | |
73 final RiType type = null; | |
74 final boolean exact = false; | |
75 } | |
76 } |