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Java example source code file (BitData.java)
The BitData.java Java example source code/* * Copyright (c) 2011, 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.*; // BitData // // A BitData holds a flag or two in its header. public class BitData extends ProfileData { // nullSeen: // saw a null operand (cast/aastore/instanceof) static final int nullSeenFlag = DataLayout.firstFlag + 0; static final int bitCellCount = 0; public BitData(DataLayout layout) { super(layout); } static int staticCellCount() { return bitCellCount; } public int cellCount() { return staticCellCount(); } // Accessor // The nullSeen flag bit is specially known to the interpreter. // Consulting it allows the compiler to avoid setting up nullCheck traps. boolean nullSeen() { return flagAt(nullSeenFlag); } // Code generation support // static int nullSeenByteConstant() { // return flagNumberToByteConstant(nullSeenFlag); // } static int bitDataSize() { return cellOffset(bitCellCount); } public void printDataOn(PrintStream st) { printShared(st, "BitData"); } } Other Java examples (source code examples)Here is a short list of links related to this Java BitData.java source code file: |
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