| /* |
| * Copyright (c) 2003, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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.management.counter.perf; |
| |
| import sun.management.counter.*; |
| import java.nio.*; |
| import java.io.UnsupportedEncodingException; |
| |
| class PerfDataEntry { |
| private class EntryFieldOffset { |
| private final static int SIZEOF_BYTE = 1; |
| private final static int SIZEOF_INT = 4; |
| private final static int SIZEOF_LONG = 8; |
| |
| private final static int ENTRY_LENGTH_SIZE = SIZEOF_INT; |
| private final static int NAME_OFFSET_SIZE = SIZEOF_INT; |
| private final static int VECTOR_LENGTH_SIZE = SIZEOF_INT; |
| private final static int DATA_TYPE_SIZE = SIZEOF_BYTE; |
| private final static int FLAGS_SIZE = SIZEOF_BYTE; |
| private final static int DATA_UNIT_SIZE = SIZEOF_BYTE; |
| private final static int DATA_VAR_SIZE = SIZEOF_BYTE; |
| private final static int DATA_OFFSET_SIZE = SIZEOF_INT; |
| |
| final static int ENTRY_LENGTH = 0; |
| final static int NAME_OFFSET = ENTRY_LENGTH + ENTRY_LENGTH_SIZE; |
| final static int VECTOR_LENGTH = NAME_OFFSET + NAME_OFFSET_SIZE;; |
| final static int DATA_TYPE = VECTOR_LENGTH + VECTOR_LENGTH_SIZE; |
| final static int FLAGS = DATA_TYPE + DATA_TYPE_SIZE; |
| final static int DATA_UNIT = FLAGS + FLAGS_SIZE; |
| final static int DATA_VAR = DATA_UNIT + DATA_UNIT_SIZE; |
| final static int DATA_OFFSET = DATA_VAR + DATA_VAR_SIZE; |
| } |
| |
| private String name; |
| private int entryStart; |
| private int entryLength; |
| private int vectorLength; |
| private PerfDataType dataType; |
| private int flags; |
| private Units unit; |
| private Variability variability; |
| private int dataOffset; |
| private int dataSize; |
| private ByteBuffer data; |
| |
| PerfDataEntry(ByteBuffer b) { |
| entryStart = b.position(); |
| entryLength = b.getInt(); |
| |
| // check for valid entry length |
| if (entryLength <= 0 || entryLength > b.limit()) { |
| throw new InstrumentationException("Invalid entry length: " + |
| " entryLength = " + entryLength); |
| } |
| // check if last entry occurs before the eof. |
| if ((entryStart + entryLength) > b.limit()) { |
| throw new InstrumentationException("Entry extends beyond end of buffer: " + |
| " entryStart = " + entryStart + |
| " entryLength = " + entryLength + |
| " buffer limit = " + b.limit()); |
| } |
| |
| b.position(entryStart + EntryFieldOffset.NAME_OFFSET); |
| int nameOffset = b.getInt(); |
| |
| if ((entryStart + nameOffset) > b.limit()) { |
| throw new InstrumentationException("Invalid name offset: " + |
| " entryStart = " + entryStart + |
| " nameOffset = " + nameOffset + |
| " buffer limit = " + b.limit()); |
| } |
| |
| |
| b.position(entryStart + EntryFieldOffset.VECTOR_LENGTH); |
| vectorLength = b.getInt(); |
| |
| b.position(entryStart + EntryFieldOffset.DATA_TYPE); |
| dataType = PerfDataType.toPerfDataType(b.get()); |
| |
| b.position(entryStart + EntryFieldOffset.FLAGS); |
| flags = b.get(); |
| |
| b.position(entryStart + EntryFieldOffset.DATA_UNIT); |
| unit = Units.toUnits(b.get()); |
| |
| b.position(entryStart + EntryFieldOffset.DATA_VAR); |
| variability = Variability.toVariability(b.get()); |
| |
| b.position(entryStart + EntryFieldOffset.DATA_OFFSET); |
| dataOffset = b.getInt(); |
| |
| // read in the perfData item name, casting bytes to chars. skip the |
| // null terminator |
| b.position(entryStart + nameOffset); |
| // calculate the length of the name |
| int nameLength = 0; |
| byte c; |
| for (; (c = b.get()) != (byte)0; nameLength++); |
| |
| byte[] symbolBytes = new byte[nameLength]; |
| b.position(entryStart + nameOffset); |
| for (int i = 0; i < nameLength; i++) { |
| symbolBytes[i] = b.get(); |
| } |
| |
| // convert name into a String |
| try { |
| name = new String(symbolBytes, "UTF-8"); |
| } |
| catch (UnsupportedEncodingException e) { |
| // should not reach here |
| // "UTF-8" is always a known encoding |
| throw new InternalError(e.getMessage(), e); |
| } |
| |
| if (variability == Variability.INVALID) { |
| throw new InstrumentationException("Invalid variability attribute:" + |
| " name = " + name); |
| } |
| if (unit == Units.INVALID) { |
| throw new InstrumentationException("Invalid units attribute: " + |
| " name = " + name); |
| } |
| |
| if (vectorLength > 0) { |
| dataSize = vectorLength * dataType.size(); |
| } else { |
| dataSize = dataType.size(); |
| } |
| |
| // check if data beyond the eof. |
| if ((entryStart + dataOffset + dataSize) > b.limit()) { |
| throw new InstrumentationException("Data extends beyond end of buffer: " + |
| " entryStart = " + entryStart + |
| " dataOffset = " + dataOffset+ |
| " dataSize = " + dataSize + |
| " buffer limit = " + b.limit()); |
| } |
| // Construct a ByteBuffer for the data |
| b.position(entryStart + dataOffset); |
| data = b.slice(); |
| data.order(b.order()); |
| data.limit(dataSize); |
| } |
| |
| |
| public int size() { |
| return entryLength; |
| } |
| |
| public String name() { |
| return name; |
| } |
| |
| public PerfDataType type() { |
| return dataType; |
| } |
| |
| public Units units() { |
| return unit; |
| } |
| |
| public int flags() { |
| return flags; |
| } |
| |
| /** |
| * Returns the number of elements in the data. |
| */ |
| public int vectorLength() { |
| return vectorLength; |
| } |
| |
| public Variability variability() { |
| return variability; |
| } |
| |
| public ByteBuffer byteData() { |
| data.position(0); |
| assert data.remaining() == vectorLength(); |
| return data.duplicate(); |
| } |
| |
| public LongBuffer longData() { |
| LongBuffer lb = data.asLongBuffer(); |
| return lb; |
| } |
| } |