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comparison graal/GraalCompiler/src/com/sun/c1x/opt/TypeAnalyzer.java @ 2509:16b9a8b5ad39

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Renamings Runtime=>GraalRuntime and Compiler=>GraalCompiler
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:50:44 +0200
parents graal/Compiler/src/com/sun/c1x/opt/TypeAnalyzer.java@9ec15d6914ca
children
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2508:fea94949e0a2 2509:16b9a8b5ad39
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 }