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866e5b51 | 1 | /******************************************************************************* |
60ae41e1 | 2 | * Copyright (c) 2011, 2014 Ericsson, Ecole Polytechnique de Montreal and others |
866e5b51 FC |
3 | * |
4 | * All rights reserved. This program and the accompanying materials are made | |
5 | * available under the terms of the Eclipse Public License v1.0 which | |
6 | * accompanies this distribution, and is available at | |
7 | * http://www.eclipse.org/legal/epl-v10.html | |
8 | * | |
9 | * Contributors: Matthew Khouzam - Initial API and implementation | |
10 | * Contributors: Simon Marchi - Initial API and implementation | |
11 | *******************************************************************************/ | |
12 | package org.eclipse.linuxtools.ctf.core.trace; | |
13 | ||
14 | import java.io.IOException; | |
526c823c | 15 | import java.nio.ByteBuffer; |
866e5b51 | 16 | |
a4fa4e36 | 17 | import org.eclipse.jdt.annotation.NonNull; |
733c614c | 18 | import org.eclipse.jdt.annotation.Nullable; |
c26d0fe0 | 19 | import org.eclipse.linuxtools.ctf.core.CTFStrings; |
866e5b51 | 20 | import org.eclipse.linuxtools.ctf.core.event.EventDefinition; |
a4fa4e36 | 21 | import org.eclipse.linuxtools.ctf.core.event.IEventDeclaration; |
486efb2e | 22 | import org.eclipse.linuxtools.ctf.core.event.io.BitBuffer; |
a4fa4e36 MK |
23 | import org.eclipse.linuxtools.ctf.core.event.scope.IDefinitionScope; |
24 | import org.eclipse.linuxtools.ctf.core.event.scope.LexicalScope; | |
866e5b51 | 25 | import org.eclipse.linuxtools.ctf.core.event.types.Definition; |
cc98c947 | 26 | import org.eclipse.linuxtools.ctf.core.event.types.IDefinition; |
a4fa4e36 | 27 | import org.eclipse.linuxtools.ctf.core.event.types.IntegerDeclaration; |
866e5b51 | 28 | import org.eclipse.linuxtools.ctf.core.event.types.IntegerDefinition; |
21fb02fa | 29 | import org.eclipse.linuxtools.ctf.core.event.types.SimpleDatatypeDefinition; |
866e5b51 FC |
30 | import org.eclipse.linuxtools.ctf.core.event.types.StructDeclaration; |
31 | import org.eclipse.linuxtools.ctf.core.event.types.StructDefinition; | |
32 | import org.eclipse.linuxtools.ctf.core.event.types.VariantDefinition; | |
8e964be1 | 33 | import org.eclipse.linuxtools.internal.ctf.core.event.EventDeclaration; |
ce2388e0 | 34 | import org.eclipse.linuxtools.internal.ctf.core.trace.StreamInputPacketIndexEntry; |
866e5b51 | 35 | |
a4fa4e36 MK |
36 | import com.google.common.collect.ImmutableList; |
37 | ||
866e5b51 | 38 | /** |
d37aaa7f | 39 | * CTF trace packet reader. Reads the events of a packet of a trace file. |
5c7202b5 | 40 | * |
d37aaa7f FC |
41 | * @author Matthew Khouzam |
42 | * @author Simon Marchi | |
d84419e1 | 43 | * @since 3.0 |
866e5b51 | 44 | */ |
d84419e1 | 45 | public class CTFStreamInputPacketReader implements IDefinitionScope, AutoCloseable { |
866e5b51 FC |
46 | |
47 | // ------------------------------------------------------------------------ | |
6bdc9fac | 48 | // Attributes |
866e5b51 FC |
49 | // ------------------------------------------------------------------------ |
50 | ||
6bdc9fac | 51 | /** BitBuffer used to read the trace file. */ |
733c614c MK |
52 | @Nullable |
53 | private BitBuffer fBitBuffer; | |
866e5b51 | 54 | |
6bdc9fac | 55 | /** StreamInputReader that uses this StreamInputPacketReader. */ |
d84419e1 | 56 | private final CTFStreamInputReader fStreamInputReader; |
866e5b51 | 57 | |
6bdc9fac | 58 | /** Trace packet header. */ |
a4fa4e36 | 59 | private final StructDeclaration fTracePacketHeaderDecl; |
866e5b51 | 60 | |
6bdc9fac | 61 | /** Stream packet context definition. */ |
a4fa4e36 | 62 | private final StructDeclaration fStreamPacketContextDecl; |
866e5b51 | 63 | |
6bdc9fac | 64 | /** Stream event header definition. */ |
a4fa4e36 | 65 | private final StructDeclaration fStreamEventHeaderDecl; |
866e5b51 | 66 | |
c26d0fe0 | 67 | /** Stream event context definition. */ |
a4fa4e36 | 68 | private final StructDeclaration fStreamEventContextDecl; |
866e5b51 | 69 | |
a4fa4e36 MK |
70 | private StructDefinition fCurrentTracePacketHeaderDef; |
71 | private StructDefinition fCurrentStreamEventHeaderDef; | |
72 | private Definition fCurrentStreamPacketContextDef; | |
6bdc9fac | 73 | /** Reference to the index entry of the current packet. */ |
2882273c | 74 | private StreamInputPacketIndexEntry fCurrentPacket = null; |
6bdc9fac | 75 | |
866e5b51 | 76 | /** |
6bdc9fac AM |
77 | * Last timestamp recorded. |
78 | * | |
79 | * Needed to calculate the complete timestamp values for the events with | |
80 | * compact headers. | |
866e5b51 | 81 | */ |
2882273c | 82 | private long fLastTimestamp = 0; |
6bdc9fac AM |
83 | |
84 | /** CPU id of current packet. */ | |
2882273c | 85 | private int fCurrentCpu = 0; |
866e5b51 | 86 | |
2882273c | 87 | private int fLostEventsInThisPacket; |
5c7202b5 | 88 | |
2882273c | 89 | private long fLostEventsDuration; |
c26d0fe0 | 90 | |
2882273c | 91 | private boolean fHasLost = false; |
c26d0fe0 | 92 | |
866e5b51 | 93 | // ------------------------------------------------------------------------ |
6bdc9fac | 94 | // Constructors |
866e5b51 FC |
95 | // ------------------------------------------------------------------------ |
96 | ||
97 | /** | |
98 | * Constructs a StreamInputPacketReader. | |
99 | * | |
100 | * @param streamInputReader | |
101 | * The StreamInputReader to which this packet reader belongs to. | |
102 | */ | |
d84419e1 | 103 | public CTFStreamInputPacketReader(CTFStreamInputReader streamInputReader) { |
2882273c | 104 | fStreamInputReader = streamInputReader; |
866e5b51 | 105 | |
6bdc9fac | 106 | /* Set the BitBuffer's byte order. */ |
2882273c MK |
107 | fBitBuffer = new BitBuffer(); |
108 | fBitBuffer.setByteOrder(streamInputReader.getByteOrder()); | |
33656d8e | 109 | |
d84419e1 | 110 | final CTFStream currentStream = streamInputReader.getStreamInput().getStream(); |
a4fa4e36 MK |
111 | fTracePacketHeaderDecl = currentStream.getTrace().getPacketHeader(); |
112 | fStreamPacketContextDecl = currentStream.getPacketContextDecl(); | |
113 | fStreamEventHeaderDecl = currentStream.getEventHeaderDecl(); | |
114 | fStreamEventContextDecl = currentStream.getEventContextDecl(); | |
115 | } | |
6bdc9fac | 116 | |
a4fa4e36 MK |
117 | /** |
118 | * Get the event context defintiion | |
119 | * | |
120 | * @param input | |
121 | * the bitbuffer to read from | |
122 | * @return an context definition, can be null | |
123 | * @throws CTFReaderException | |
124 | * out of bounds exception or such | |
a4fa4e36 MK |
125 | */ |
126 | public StructDefinition getEventContextDefinition(@NonNull BitBuffer input) throws CTFReaderException { | |
70f60307 | 127 | return fStreamEventContextDecl.createDefinition(fStreamInputReader.getStreamInput(), LexicalScope.STREAM_EVENT_CONTEXT, input); |
a4fa4e36 | 128 | } |
6bdc9fac | 129 | |
a4fa4e36 MK |
130 | /** |
131 | * Get the stream context defintiion | |
132 | * | |
133 | * @param input | |
134 | * the bitbuffer to read from | |
135 | * @return an context definition, can be null | |
136 | * @throws CTFReaderException | |
137 | * out of bounds exception or such | |
a4fa4e36 MK |
138 | */ |
139 | public StructDefinition getStreamEventHeaderDefinition(@NonNull BitBuffer input) throws CTFReaderException { | |
70f60307 | 140 | return fStreamEventHeaderDecl.createDefinition(this, LexicalScope.EVENT_HEADER, input); |
a4fa4e36 | 141 | } |
6bdc9fac | 142 | |
a4fa4e36 MK |
143 | /** |
144 | * Get the packet context defintiion | |
145 | * | |
146 | * @param input | |
147 | * the bitbuffer to read from | |
148 | * @return an context definition, can be null | |
149 | * @throws CTFReaderException | |
150 | * out of bounds exception or such | |
a4fa4e36 MK |
151 | */ |
152 | public StructDefinition getStreamPacketContextDefinition(@NonNull BitBuffer input) throws CTFReaderException { | |
70f60307 | 153 | return fStreamPacketContextDecl.createDefinition(fStreamInputReader.getStreamInput(), LexicalScope.STREAM_PACKET_CONTEXT, input); |
a4fa4e36 | 154 | } |
6bdc9fac | 155 | |
a4fa4e36 MK |
156 | /** |
157 | * Get the event header defintiion | |
158 | * | |
159 | * @param input | |
160 | * the bitbuffer to read from | |
161 | * @return an header definition, can be null | |
162 | * @throws CTFReaderException | |
163 | * out of bounds exception or such | |
a4fa4e36 MK |
164 | */ |
165 | public StructDefinition getTracePacketHeaderDefinition(@NonNull BitBuffer input) throws CTFReaderException { | |
70f60307 | 166 | return fTracePacketHeaderDecl.createDefinition(fStreamInputReader.getStreamInput().getStream().getTrace(), LexicalScope.TRACE_PACKET_HEADER, input); |
6bdc9fac | 167 | } |
866e5b51 | 168 | |
5d1c6919 PT |
169 | /** |
170 | * Dispose the StreamInputPacketReader | |
5d1c6919 | 171 | */ |
dd9752d5 AM |
172 | @Override |
173 | public void close() { | |
733c614c | 174 | fBitBuffer = null; |
5d1c6919 PT |
175 | } |
176 | ||
866e5b51 FC |
177 | // ------------------------------------------------------------------------ |
178 | // Getters/Setters/Predicates | |
179 | // ------------------------------------------------------------------------ | |
180 | ||
9ac2eb62 MK |
181 | /** |
182 | * Gets the current packet | |
183 | * | |
184 | * @return the current packet | |
185 | */ | |
486efb2e | 186 | StreamInputPacketIndexEntry getCurrentPacket() { |
2882273c | 187 | return fCurrentPacket; |
866e5b51 FC |
188 | } |
189 | ||
9ac2eb62 MK |
190 | /** |
191 | * Gets the CPU (core) number | |
192 | * | |
193 | * @return the CPU (core) number | |
194 | */ | |
866e5b51 | 195 | public int getCPU() { |
2882273c | 196 | return fCurrentCpu; |
866e5b51 FC |
197 | } |
198 | ||
199 | @Override | |
a4fa4e36 MK |
200 | public LexicalScope getScopePath() { |
201 | return LexicalScope.PACKET; | |
866e5b51 FC |
202 | } |
203 | ||
204 | // ------------------------------------------------------------------------ | |
205 | // Operations | |
206 | // ------------------------------------------------------------------------ | |
207 | ||
866e5b51 FC |
208 | /** |
209 | * Changes the current packet to the given one. | |
210 | * | |
211 | * @param currentPacket | |
212 | * The index entry of the packet to switch to. | |
db8e8f7d AM |
213 | * @throws CTFReaderException |
214 | * If we get an error reading the packet | |
866e5b51 | 215 | */ |
db8e8f7d | 216 | void setCurrentPacket(StreamInputPacketIndexEntry currentPacket) throws CTFReaderException { |
c26d0fe0 | 217 | StreamInputPacketIndexEntry prevPacket = null; |
2882273c | 218 | fCurrentPacket = currentPacket; |
866e5b51 | 219 | |
2882273c | 220 | if (fCurrentPacket != null) { |
866e5b51 FC |
221 | /* |
222 | * Change the map of the BitBuffer. | |
223 | */ | |
526c823c | 224 | ByteBuffer bb = null; |
866e5b51 | 225 | try { |
2882273c | 226 | bb = fStreamInputReader.getStreamInput().getByteBufferAt( |
a4fa4e36 MK |
227 | fCurrentPacket.getOffsetBytes(), |
228 | (fCurrentPacket.getPacketSizeBits() + 7) / 8); | |
866e5b51 | 229 | } catch (IOException e) { |
cf9a28da | 230 | throw new CTFReaderException(e.getMessage(), e); |
866e5b51 FC |
231 | } |
232 | ||
733c614c MK |
233 | BitBuffer bitBuffer = new BitBuffer(bb); |
234 | fBitBuffer = bitBuffer; | |
866e5b51 FC |
235 | /* |
236 | * Read trace packet header. | |
237 | */ | |
a4fa4e36 | 238 | if (fTracePacketHeaderDecl != null) { |
733c614c | 239 | fCurrentTracePacketHeaderDef = getTracePacketHeaderDefinition(bitBuffer); |
866e5b51 FC |
240 | } |
241 | ||
242 | /* | |
243 | * Read stream packet context. | |
244 | */ | |
a4fa4e36 | 245 | if (fStreamPacketContextDecl != null) { |
733c614c | 246 | fCurrentStreamPacketContextDef = getStreamPacketContextDefinition(bitBuffer); |
33656d8e | 247 | |
132a02b0 | 248 | /* Read CPU ID */ |
2882273c MK |
249 | if (getCurrentPacket().getTarget() != null) { |
250 | fCurrentCpu = (int) getCurrentPacket().getTargetId(); | |
866e5b51 | 251 | } |
21fb02fa | 252 | |
132a02b0 | 253 | /* Read number of lost events */ |
2882273c MK |
254 | fLostEventsInThisPacket = (int) getCurrentPacket().getLostEvents(); |
255 | if (fLostEventsInThisPacket != 0) { | |
256 | fHasLost = true; | |
c26d0fe0 AM |
257 | /* |
258 | * Compute the duration of the lost event time range. If the | |
259 | * current packet is the first packet, duration will be set | |
260 | * to 1. | |
261 | */ | |
262 | long lostEventsStartTime; | |
2882273c | 263 | int index = fStreamInputReader.getStreamInput().getIndex().getEntries().indexOf(currentPacket); |
c26d0fe0 AM |
264 | if (index == 0) { |
265 | lostEventsStartTime = currentPacket.getTimestampBegin() + 1; | |
266 | } else { | |
2882273c | 267 | prevPacket = fStreamInputReader.getStreamInput().getIndex().getEntries().get(index - 1); |
c26d0fe0 AM |
268 | lostEventsStartTime = prevPacket.getTimestampEnd(); |
269 | } | |
2882273c | 270 | fLostEventsDuration = Math.abs(lostEventsStartTime - currentPacket.getTimestampBegin()); |
c26d0fe0 | 271 | } |
866e5b51 FC |
272 | } |
273 | ||
274 | /* | |
275 | * Use the timestamp begin of the packet as the reference for the | |
276 | * timestamp reconstitution. | |
277 | */ | |
2882273c | 278 | fLastTimestamp = currentPacket.getTimestampBegin(); |
866e5b51 | 279 | } else { |
733c614c | 280 | fBitBuffer = null; |
2882273c | 281 | fLastTimestamp = 0; |
866e5b51 FC |
282 | } |
283 | } | |
284 | ||
285 | /** | |
286 | * Returns whether it is possible to read any more events from this packet. | |
287 | * | |
288 | * @return True if it is possible to read any more events from this packet. | |
289 | */ | |
290 | public boolean hasMoreEvents() { | |
733c614c MK |
291 | BitBuffer bitBuffer = fBitBuffer; |
292 | StreamInputPacketIndexEntry currentPacket = fCurrentPacket; | |
293 | if (currentPacket != null && bitBuffer != null) { | |
294 | return fHasLost || (bitBuffer.position() < currentPacket.getContentSizeBits()); | |
866e5b51 FC |
295 | } |
296 | return false; | |
297 | } | |
298 | ||
299 | /** | |
300 | * Reads the next event of the packet into the right event definition. | |
301 | * | |
302 | * @return The event definition containing the event data that was just | |
303 | * read. | |
304 | * @throws CTFReaderException | |
be6df2d8 | 305 | * If there was a problem reading the trace |
866e5b51 FC |
306 | */ |
307 | public EventDefinition readNextEvent() throws CTFReaderException { | |
1fbaecd1 | 308 | /* Default values for those fields */ |
b73145e2 | 309 | long eventID = EventDeclaration.UNSET_EVENT_ID; |
866e5b51 | 310 | long timestamp = 0; |
2882273c MK |
311 | if (fHasLost) { |
312 | fHasLost = false; | |
a4fa4e36 MK |
313 | EventDeclaration lostEventDeclaration = EventDeclaration.getLostEventDeclaration(); |
314 | StructDeclaration lostFields = lostEventDeclaration.getFields(); | |
315 | // this is a hard coded map, we know it's not null | |
2db699c2 | 316 | IntegerDeclaration lostFieldsDecl = (IntegerDeclaration) lostFields.getField(CTFStrings.LOST_EVENTS_FIELD); |
a4fa4e36 MK |
317 | if (lostFieldsDecl == null) |
318 | { | |
319 | throw new IllegalStateException("Lost events count not declared!"); //$NON-NLS-1$ | |
320 | } | |
2db699c2 | 321 | IntegerDeclaration lostEventsDurationDecl = (IntegerDeclaration) lostFields.getField(CTFStrings.LOST_EVENTS_DURATION); |
a4fa4e36 MK |
322 | if (lostEventsDurationDecl == null) { |
323 | throw new IllegalStateException("Lost events duration not declared!"); //$NON-NLS-1$ | |
324 | } | |
325 | IntegerDefinition lostDurationDef = new IntegerDefinition(lostFieldsDecl, null, CTFStrings.LOST_EVENTS_DURATION, fLostEventsDuration); | |
326 | IntegerDefinition lostCountDef = new IntegerDefinition(lostEventsDurationDecl, null, CTFStrings.LOST_EVENTS_FIELD, fLostEventsInThisPacket); | |
327 | IntegerDefinition[] fields = new IntegerDefinition[] { lostCountDef, lostDurationDef }; | |
328 | /* this is weird notation, but it's the java notation */ | |
329 | final ImmutableList<String> fieldNameList = ImmutableList.<String> builder().add(CTFStrings.LOST_EVENTS_FIELD).add(CTFStrings.LOST_EVENTS_DURATION).build(); | |
330 | return new EventDefinition( | |
331 | lostEventDeclaration, | |
332 | fStreamInputReader, | |
333 | fLastTimestamp, | |
334 | null, | |
335 | null, | |
336 | null, | |
337 | new StructDefinition( | |
338 | lostFields, | |
339 | this, "fields", //$NON-NLS-1$ | |
340 | fieldNameList, | |
341 | fields | |
342 | )); | |
343 | ||
33656d8e | 344 | } |
132a02b0 | 345 | |
2882273c | 346 | final BitBuffer currentBitBuffer = fBitBuffer; |
733c614c MK |
347 | if( currentBitBuffer == null ) { |
348 | return null; | |
349 | } | |
cf9a28da | 350 | final long posStart = currentBitBuffer.position(); |
1fbaecd1 | 351 | /* Read the stream event header. */ |
a4fa4e36 MK |
352 | if (fStreamEventHeaderDecl != null) { |
353 | fCurrentStreamEventHeaderDef = getStreamEventHeaderDefinition(currentBitBuffer); | |
866e5b51 | 354 | |
1fbaecd1 | 355 | /* Check for the event id. */ |
cc98c947 | 356 | IDefinition idDef = fCurrentStreamEventHeaderDef.lookupDefinition("id"); //$NON-NLS-1$ |
1fbaecd1 AM |
357 | if (idDef instanceof SimpleDatatypeDefinition) { |
358 | eventID = ((SimpleDatatypeDefinition) idDef).getIntegerValue(); | |
b8cb28f6 | 359 | } else if (idDef != null) { |
816fde81 | 360 | throw new CTFReaderException("Incorrect event id : " + eventID); //$NON-NLS-1$ |
b8cb28f6 | 361 | } |
866e5b51 | 362 | |
c26d0fe0 AM |
363 | /* |
364 | * Get the timestamp from the event header (may be overridden later | |
365 | * on) | |
366 | */ | |
a4fa4e36 | 367 | IntegerDefinition timestampDef = fCurrentStreamEventHeaderDef.lookupInteger("timestamp"); //$NON-NLS-1$ |
0594c61c AM |
368 | if (timestampDef != null) { |
369 | timestamp = calculateTimestamp(timestampDef); | |
6bdc9fac | 370 | } // else timestamp remains 0 |
1fbaecd1 AM |
371 | |
372 | /* Check for the variant v. */ | |
cc98c947 | 373 | IDefinition variantDef = fCurrentStreamEventHeaderDef.lookupDefinition("v"); //$NON-NLS-1$ |
6bdc9fac | 374 | if (variantDef instanceof VariantDefinition) { |
866e5b51 | 375 | |
1fbaecd1 | 376 | /* Get the variant current field */ |
6bdc9fac | 377 | StructDefinition variantCurrentField = (StructDefinition) ((VariantDefinition) variantDef).getCurrentField(); |
866e5b51 | 378 | |
21fb02fa MK |
379 | /* |
380 | * Try to get the id field in the current field of the variant. | |
381 | * If it is present, it overrides the previously read event id. | |
382 | */ | |
cc98c947 | 383 | IDefinition idIntegerDef = variantCurrentField.lookupDefinition("id"); //$NON-NLS-1$ |
6bdc9fac AM |
384 | if (idIntegerDef instanceof IntegerDefinition) { |
385 | eventID = ((IntegerDefinition) idIntegerDef).getValue(); | |
21fb02fa | 386 | } |
866e5b51 | 387 | |
c26d0fe0 AM |
388 | /* |
389 | * Get the timestamp. This would overwrite any previous | |
390 | * timestamp definition | |
391 | */ | |
cc98c947 | 392 | IDefinition def = variantCurrentField.lookupDefinition("timestamp"); //$NON-NLS-1$ |
0594c61c AM |
393 | if (def instanceof IntegerDefinition) { |
394 | timestamp = calculateTimestamp((IntegerDefinition) def); | |
6bdc9fac | 395 | } |
21fb02fa | 396 | } |
866e5b51 FC |
397 | } |
398 | ||
1fbaecd1 | 399 | /* Get the right event definition using the event id. */ |
a4fa4e36 MK |
400 | IEventDeclaration eventDeclaration = fStreamInputReader.getStreamInput().getStream().getEvents().get(eventID); |
401 | if (eventDeclaration == null) { | |
866e5b51 FC |
402 | throw new CTFReaderException("Incorrect event id : " + eventID); //$NON-NLS-1$ |
403 | } | |
733c614c | 404 | EventDefinition eventDef = eventDeclaration.createDefinition(fStreamInputReader, currentBitBuffer, timestamp); |
866e5b51 FC |
405 | |
406 | /* | |
407 | * Set the event timestamp using the timestamp calculated by | |
408 | * updateTimestamp. | |
409 | */ | |
866e5b51 | 410 | |
cf9a28da MK |
411 | if (posStart == currentBitBuffer.position()) { |
412 | throw new CTFReaderException("Empty event not allowed, event: " + eventDef.getDeclaration().getName()); //$NON-NLS-1$ | |
413 | } | |
414 | ||
866e5b51 FC |
415 | return eventDef; |
416 | } | |
417 | ||
418 | /** | |
419 | * Calculates the timestamp value of the event, possibly using the timestamp | |
420 | * from the last event. | |
421 | * | |
422 | * @param timestampDef | |
423 | * Integer definition of the timestamp. | |
424 | * @return The calculated timestamp value. | |
425 | */ | |
426 | private long calculateTimestamp(IntegerDefinition timestampDef) { | |
427 | long newval; | |
428 | long majorasbitmask; | |
429 | int len = timestampDef.getDeclaration().getLength(); | |
430 | ||
431 | /* | |
432 | * If the timestamp length is 64 bits, it is a full timestamp. | |
433 | */ | |
434 | if (timestampDef.getDeclaration().getLength() == 64) { | |
2882273c MK |
435 | fLastTimestamp = timestampDef.getValue(); |
436 | return fLastTimestamp; | |
866e5b51 FC |
437 | } |
438 | ||
439 | /* | |
440 | * Bit mask to keep / remove all old / new bits. | |
441 | */ | |
442 | majorasbitmask = (1L << len) - 1; | |
443 | ||
444 | /* | |
445 | * If the new value is smaller than the corresponding bits of the last | |
446 | * timestamp, we assume an overflow of the compact representation. | |
447 | */ | |
448 | newval = timestampDef.getValue(); | |
2882273c | 449 | if (newval < (fLastTimestamp & majorasbitmask)) { |
866e5b51 FC |
450 | newval = newval + (1L << len); |
451 | } | |
452 | ||
453 | /* Keep only the high bits of the old value */ | |
2882273c | 454 | fLastTimestamp = fLastTimestamp & ~majorasbitmask; |
866e5b51 FC |
455 | |
456 | /* Then add the low bits of the new value */ | |
2882273c | 457 | fLastTimestamp = fLastTimestamp + newval; |
866e5b51 | 458 | |
2882273c | 459 | return fLastTimestamp; |
866e5b51 FC |
460 | } |
461 | ||
462 | @Override | |
463 | public Definition lookupDefinition(String lookupPath) { | |
f159df11 | 464 | if (lookupPath.equals(LexicalScope.STREAM_PACKET_CONTEXT.toString())) { |
a4fa4e36 MK |
465 | return fCurrentStreamPacketContextDef; |
466 | } | |
f159df11 | 467 | if (lookupPath.equals(LexicalScope.TRACE_PACKET_HEADER.toString())) { |
a4fa4e36 MK |
468 | return fCurrentTracePacketHeaderDef; |
469 | } | |
866e5b51 FC |
470 | return null; |
471 | } | |
a4fa4e36 MK |
472 | |
473 | /** | |
474 | * Get stream event header | |
475 | * | |
476 | * @return the stream event header | |
a4fa4e36 MK |
477 | */ |
478 | public StructDefinition getCurrentStreamEventHeader() { | |
479 | return fCurrentStreamEventHeaderDef; | |
480 | } | |
481 | ||
482 | /** | |
483 | * Get the current packet event header | |
484 | * | |
485 | * @return the current packet event header | |
a4fa4e36 MK |
486 | */ |
487 | public StructDefinition getCurrentPacketEventHeader() { | |
488 | return fCurrentTracePacketHeaderDef; | |
489 | } | |
866e5b51 | 490 | } |