Mercurial > hg > graal-compiler
view agent/src/share/classes/sun/jvm/hotspot/oops/CompressedLineNumberReadStream.java @ 2468:6c97c830fb6f
Merge
author | jrose |
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date | Sat, 09 Apr 2011 21:16:12 -0700 |
parents | c18cbe5936b8 |
children |
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/* * Copyright (c) 2001, 2005, 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 sun.jvm.hotspot.code.*; import sun.jvm.hotspot.debugger.*; public class CompressedLineNumberReadStream extends CompressedReadStream { /** Equivalent to CompressedLineNumberReadStream(buffer, 0) */ public CompressedLineNumberReadStream(Address buffer) { this(buffer, 0); } public CompressedLineNumberReadStream(Address buffer, int position) { super(buffer, position); } /** Read (bci, line number) pair from stream. Returns false at end-of-stream. */ public boolean readPair() { int next = readByte() & 0xFF; // Check for terminator if (next == 0) return false; if (next == 0xFF) { // Escape character, regular compression used bci += readSignedInt(); line += readSignedInt(); } else { // Single byte compression used bci += next >> 3; line += next & 0x7; } return true; } public int bci() { return bci; } public int line() { return line; } //-------------------------------------------------------------------------------- // Internals only below this point // private int bci; private int line; }