Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/utilities/Bits.java @ 271:818a18cd69a8
6730514: assertion failure in mangling code when expanding by 0 bytes
Summary: An expansion by 0 bytes was not anticipated when the assertion was composed.
Reviewed-by: jjh, jcoomes, apetrusenko
author | jmasa |
---|---|
date | Wed, 30 Jul 2008 11:54:00 -0700 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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/* * Copyright 2001-2004 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ package sun.jvm.hotspot.utilities; /** Bit manipulation routines */ public class Bits { public static final int AllBits = ~0; public static final int NoBits = 0; public static final int OneBit = 1; public static final int BitsPerByte = 8; public static final int BitsPerInt = 32; public static final int LogBytesPerInt = 2; public static final int LogBytesPerLong = 3; public static int setBits(int x, int m) { return x | m; } public static int clearBits(int x, int m) { return x & ~m; } public static int nthBit(int n) { return (n > 32) ? 0 : (OneBit << n); } public static int setNthBit(int x, int n) { return setBits(x, nthBit(n)); } public static int clearNthBit(int x, int n) { return clearBits(x, nthBit(n)); } public static boolean isSetNthBit(int word, int n) { return maskBits(word, nthBit(n)) != NoBits; } public static int rightNBits(int n) { return (nthBit(n) - 1); } public static int maskBits(int x, int m) { return x & m; } public static long maskBitsLong(long x, long m) { return x & m; } /** Returns integer round-up to the nearest multiple of s (s must be a power of two) */ public static int roundTo(int x, int s) { int m = s - 1; return maskBits(x + m, ~m); } }