| /* |
| * 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; |
| } |