| /* |
| * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.oops; |
| |
| import java.io.*; |
| import java.util.*; |
| import sun.jvm.hotspot.debugger.*; |
| import sun.jvm.hotspot.runtime.*; |
| import sun.jvm.hotspot.types.*; |
| import sun.jvm.hotspot.utilities.*; |
| |
| // MultiBranchData |
| // |
| // A MultiBranchData is used to access profiling information for |
| // a multi-way branch (*switch bytecodes). It consists of a series |
| // of (count, displacement) pairs, which count the number of times each |
| // case was taken and specify the data displacment for each branch target. |
| public class MultiBranchData extends ArrayData { |
| static final int defaultCountOffSet = 0; |
| static final int defaultDisaplacementOffSet = 1; |
| static final int caseArrayStart = 2; |
| static final int relativeCountOffSet = 0; |
| static final int relativeDisplacementOffSet = 1; |
| static final int perCaseCellCount = 2; |
| |
| public MultiBranchData(DataLayout layout) { |
| super(layout); |
| //assert(layout.tag() == DataLayout.multiBranchDataTag, "wrong type"); |
| } |
| |
| // static int computeCellCount(BytecodeStream stream); |
| |
| int numberOfCases() { |
| int alen = arrayLen() - 2; // get rid of default case here. |
| //assert(alen % perCaseCellCount == 0, "must be even"); |
| return (alen / perCaseCellCount); |
| } |
| |
| int defaultCount() { |
| return arrayUintAt(defaultCountOffSet); |
| } |
| int defaultDisplacement() { |
| return arrayIntAt(defaultDisaplacementOffSet); |
| } |
| |
| int countAt(int index) { |
| return arrayUintAt(caseArrayStart + |
| index * perCaseCellCount + |
| relativeCountOffSet); |
| } |
| int displacementAt(int index) { |
| return arrayIntAt(caseArrayStart + |
| index * perCaseCellCount + |
| relativeDisplacementOffSet); |
| } |
| |
| // Code generation support |
| static int defaultCountOffset() { |
| return arrayElementOffset(defaultCountOffSet); |
| } |
| static int defaultDisplacementOffset() { |
| return arrayElementOffset(defaultDisaplacementOffSet); |
| } |
| static int caseCountOffset(int index) { |
| return caseArrayOffset() + |
| (perCaseSize() * index) + |
| relativeCountOffset(); |
| } |
| static int caseArrayOffset() { |
| return arrayElementOffset(caseArrayStart); |
| } |
| static int perCaseSize() { |
| return (perCaseCellCount) * MethodData.cellSize; |
| } |
| static int relativeCountOffset() { |
| return (relativeCountOffSet) * MethodData.cellSize; |
| } |
| static int relativeDisplacementOffset() { |
| return (relativeDisplacementOffSet) * MethodData.cellSize; |
| } |
| |
| public void printDataOn(PrintStream st) { |
| printShared(st, "MultiBranchData"); |
| st.println("default_count(" + defaultCount() + ") displacement(" + defaultDisplacement() + ")"); |
| int cases = numberOfCases(); |
| for (int i = 0; i < cases; i++) { |
| tab(st); |
| st.println("count(" + countAt(i) + ") displacement(" + displacementAt(i) + ")"); |
| } |
| } |
| } |