org.netbeans.lib.profiler.heap.StackFrameSegment Maven / Gradle / Ivy
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package org.netbeans.lib.profiler.heap;
/**
*
* @author Tomas Hurka
*/
class StackFrameSegment extends TagBounds {
//~ Instance fields ----------------------------------------------------------------------------------------------------------
HprofHeap hprofHeap;
final int methodIDOffset;
final int stackFrameIDOffset;
final int lengthOffset;
final int sourceIDOffset;
final int methodSignatureIDOffset;
final int timeOffset;
final int classSerialNumberOffset;
final int lineNumberOffset;
//~ Constructors -------------------------------------------------------------------------------------------------------------
StackFrameSegment(HprofHeap heap, long start, long end) {
super(HprofHeap.STACK_TRACE, start, end);
int idSize = heap.dumpBuffer.getIDSize();
hprofHeap = heap;
timeOffset = 1;
lengthOffset = timeOffset + 4;
stackFrameIDOffset = lengthOffset + 4;
methodIDOffset = stackFrameIDOffset + idSize;
methodSignatureIDOffset = methodIDOffset + idSize;
sourceIDOffset = methodSignatureIDOffset + idSize;
classSerialNumberOffset = sourceIDOffset + idSize;
lineNumberOffset = classSerialNumberOffset + 4;
}
//~ Methods ------------------------------------------------------------------------------------------------------------------
StackFrame getStackFrameByID(long stackFrameID) {
long[] offset = new long[] { startOffset };
while (offset[0] < endOffset) {
long start = offset[0];
long frameID = readStackFrameTag(offset);
if (frameID == stackFrameID) {
return new StackFrame(this, start);
}
}
return null;
}
private HprofByteBuffer getDumpBuffer() {
return hprofHeap.dumpBuffer;
}
private long readStackFrameTag(long[] offset) {
long start = offset[0];
if (hprofHeap.readTag(offset) != HprofHeap.STACK_FRAME) {
return 0;
}
return getDumpBuffer().getID(start + stackFrameIDOffset);
}
}