Mercurial > hg > graal-jvmci-8
comparison agent/src/share/classes/sun/jvm/hotspot/oops/MultiBranchData.java @ 3939:f6f3bb0ee072
7088955: add C2 IR support to the SA
Reviewed-by: kvn
author | never |
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date | Sun, 11 Sep 2011 14:48:24 -0700 |
parents | |
children | 4bec1b1f7b33 |
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3938:e6b1331a51d2 | 3939:f6f3bb0ee072 |
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1 /* | |
2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved. | |
3 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. | |
4 * | |
5 * | |
6 * | |
7 * | |
8 * | |
9 * | |
10 * | |
11 * | |
12 * | |
13 * | |
14 * | |
15 * | |
16 * | |
17 * | |
18 * | |
19 * | |
20 * | |
21 * | |
22 * | |
23 */ | |
24 | |
25 package sun.jvm.hotspot.oops; | |
26 | |
27 import java.io.*; | |
28 import java.util.*; | |
29 import sun.jvm.hotspot.debugger.*; | |
30 import sun.jvm.hotspot.runtime.*; | |
31 import sun.jvm.hotspot.types.*; | |
32 import sun.jvm.hotspot.utilities.*; | |
33 | |
34 // MultiBranchData | |
35 // | |
36 // A MultiBranchData is used to access profiling information for | |
37 // a multi-way branch (*switch bytecodes). It consists of a series | |
38 // of (count, displacement) pairs, which count the number of times each | |
39 // case was taken and specify the data displacment for each branch target. | |
40 public class MultiBranchData extends ArrayData { | |
41 static final int defaultCountOffSet = 0; | |
42 static final int defaultDisaplacementOffSet = 1; | |
43 static final int caseArrayStart = 2; | |
44 static final int relativeCountOffSet = 0; | |
45 static final int relativeDisplacementOffSet = 1; | |
46 static final int perCaseCellCount = 2; | |
47 | |
48 public MultiBranchData(DataLayout layout) { | |
49 super(layout); | |
50 //assert(layout.tag() == DataLayout.multiBranchDataTag, "wrong type"); | |
51 } | |
52 | |
53 // static int computeCellCount(BytecodeStream stream); | |
54 | |
55 int numberOfCases() { | |
56 int alen = arrayLen() - 2; // get rid of default case here. | |
57 //assert(alen % perCaseCellCount == 0, "must be even"); | |
58 return (alen / perCaseCellCount); | |
59 } | |
60 | |
61 int defaultCount() { | |
62 return arrayUintAt(defaultCountOffSet); | |
63 } | |
64 int defaultDisplacement() { | |
65 return arrayIntAt(defaultDisaplacementOffSet); | |
66 } | |
67 | |
68 int countAt(int index) { | |
69 return arrayUintAt(caseArrayStart + | |
70 index * perCaseCellCount + | |
71 relativeCountOffSet); | |
72 } | |
73 int displacementAt(int index) { | |
74 return arrayIntAt(caseArrayStart + | |
75 index * perCaseCellCount + | |
76 relativeDisplacementOffSet); | |
77 } | |
78 | |
79 // Code generation support | |
80 static int defaultCountOffset() { | |
81 return arrayElementOffset(defaultCountOffSet); | |
82 } | |
83 static int defaultDisplacementOffset() { | |
84 return arrayElementOffset(defaultDisaplacementOffSet); | |
85 } | |
86 static int caseCountOffset(int index) { | |
87 return caseArrayOffset() + | |
88 (perCaseSize() * index) + | |
89 relativeCountOffset(); | |
90 } | |
91 static int caseArrayOffset() { | |
92 return arrayElementOffset(caseArrayStart); | |
93 } | |
94 static int perCaseSize() { | |
95 return (perCaseCellCount) * MethodData.cellSize; | |
96 } | |
97 static int relativeCountOffset() { | |
98 return (relativeCountOffSet) * MethodData.cellSize; | |
99 } | |
100 static int relativeDisplacementOffset() { | |
101 return (relativeDisplacementOffSet) * MethodData.cellSize; | |
102 } | |
103 | |
104 public void printDataOn(PrintStream st) { | |
105 printShared(st, "MultiBranchData"); | |
106 st.println("default_count(" + defaultCount() + ") displacement(" + defaultDisplacement() + ")"); | |
107 int cases = numberOfCases(); | |
108 for (int i = 0; i < cases; i++) { | |
109 tab(st); | |
110 st.println("count(" + countAt(i) + ") displacement(" + displacementAt(i) + ")"); | |
111 } | |
112 } | |
113 } |