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comparison agent/src/share/classes/sun/jvm/hotspot/oops/MultiBranchData.java @ 3939:f6f3bb0ee072

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7088955: add C2 IR support to the SA Reviewed-by: kvn
author never
date Sun, 11 Sep 2011 14:48:24 -0700
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children 4bec1b1f7b33
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3938:e6b1331a51d2 3939:f6f3bb0ee072
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 }