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StackTraceSegment.java

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package org.netbeans.lib.profiler.heap;

import java.util.Map;


/**
 *
 * @author Tomas Hurka
 */
00053 class StackTraceSegment extends TagBounds {
    //~ Instance fields ----------------------------------------------------------------------------------------------------------

    HprofHeap hprofHeap;
    final int threadSerialNumberOffset;
    final int stackTraceSerialNumberOffset;
    final int lengthOffset;
    final int framesListOffset;
    final int numberOfFramesOffset;
    final int timeOffset;

    //~ Constructors -------------------------------------------------------------------------------------------------------------

    StackTraceSegment(HprofHeap heap, long start, long end) {
        super(HprofHeap.STACK_TRACE, start, end);

        int idSize = heap.dumpBuffer.getIDSize();
        hprofHeap = heap;
        timeOffset = 1;
        lengthOffset = timeOffset + 4;
        stackTraceSerialNumberOffset = lengthOffset + 4;
        threadSerialNumberOffset = stackTraceSerialNumberOffset + 4;
        numberOfFramesOffset = threadSerialNumberOffset + 4;
        framesListOffset = numberOfFramesOffset + 4;
    }

    //~ Methods ------------------------------------------------------------------------------------------------------------------

    StackTrace getStackTraceBySerialNumber(long stackTraceSerialNumber) {
        long[] offset = new long[] { startOffset };

        while (offset[0] < endOffset) {
            long start = offset[0];
            long serialNumber = readStackTraceTag(offset);

            if (serialNumber == stackTraceSerialNumber) {
                return new StackTrace(this, start);
            }
        }
        return null;
    }

    private HprofByteBuffer getDumpBuffer() {
        HprofByteBuffer dumpBuffer = hprofHeap.dumpBuffer;

        return dumpBuffer;
    }

    private int readStackTraceTag(long[] offset) {
        long start = offset[0];

        if (hprofHeap.readTag(offset) != HprofHeap.STACK_TRACE) {
            return 0;
        }
        return getDumpBuffer().getInt(start + stackTraceSerialNumberOffset);
    }
}

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