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866e5b51 | 1 | /******************************************************************************* |
8e964be1 | 2 | * Copyright (c) 2011-2013 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; | |
15 | import java.nio.MappedByteBuffer; | |
16 | import java.nio.channels.FileChannel.MapMode; | |
17 | import java.util.Collection; | |
866e5b51 | 18 | |
c26d0fe0 | 19 | import org.eclipse.linuxtools.ctf.core.CTFStrings; |
866e5b51 | 20 | import org.eclipse.linuxtools.ctf.core.event.EventDefinition; |
8e964be1 | 21 | import org.eclipse.linuxtools.ctf.core.event.IEventDeclaration; |
486efb2e | 22 | import org.eclipse.linuxtools.ctf.core.event.io.BitBuffer; |
866e5b51 | 23 | import org.eclipse.linuxtools.ctf.core.event.types.Definition; |
866e5b51 FC |
24 | import org.eclipse.linuxtools.ctf.core.event.types.IDefinitionScope; |
25 | import org.eclipse.linuxtools.ctf.core.event.types.IntegerDefinition; | |
21fb02fa | 26 | import org.eclipse.linuxtools.ctf.core.event.types.SimpleDatatypeDefinition; |
866e5b51 FC |
27 | import org.eclipse.linuxtools.ctf.core.event.types.StructDeclaration; |
28 | import org.eclipse.linuxtools.ctf.core.event.types.StructDefinition; | |
29 | import org.eclipse.linuxtools.ctf.core.event.types.VariantDefinition; | |
8e964be1 | 30 | import org.eclipse.linuxtools.internal.ctf.core.event.EventDeclaration; |
ce2388e0 | 31 | import org.eclipse.linuxtools.internal.ctf.core.trace.StreamInputPacketIndexEntry; |
866e5b51 FC |
32 | |
33 | /** | |
d37aaa7f | 34 | * CTF trace packet reader. Reads the events of a packet of a trace file. |
5c7202b5 | 35 | * |
d37aaa7f FC |
36 | * @version 1.0 |
37 | * @author Matthew Khouzam | |
38 | * @author Simon Marchi | |
866e5b51 | 39 | */ |
bfe038ff | 40 | public class StreamInputPacketReader implements IDefinitionScope { |
866e5b51 FC |
41 | |
42 | // ------------------------------------------------------------------------ | |
6bdc9fac | 43 | // Attributes |
866e5b51 FC |
44 | // ------------------------------------------------------------------------ |
45 | ||
6bdc9fac AM |
46 | /** BitBuffer used to read the trace file. */ |
47 | private final BitBuffer bitBuffer; | |
866e5b51 | 48 | |
6bdc9fac | 49 | /** StreamInputReader that uses this StreamInputPacketReader. */ |
866e5b51 FC |
50 | private final StreamInputReader streamInputReader; |
51 | ||
6bdc9fac AM |
52 | /** Trace packet header. */ |
53 | private final StructDefinition tracePacketHeaderDef; | |
866e5b51 | 54 | |
6bdc9fac AM |
55 | /** Stream packet context definition. */ |
56 | private final StructDefinition streamPacketContextDef; | |
866e5b51 | 57 | |
6bdc9fac AM |
58 | /** Stream event header definition. */ |
59 | private final StructDefinition streamEventHeaderDef; | |
866e5b51 | 60 | |
c26d0fe0 | 61 | /** Stream event context definition. */ |
6bdc9fac | 62 | private final StructDefinition streamEventContextDef; |
866e5b51 | 63 | |
6bdc9fac AM |
64 | /** Reference to the index entry of the current packet. */ |
65 | private StreamInputPacketIndexEntry currentPacket = null; | |
66 | ||
866e5b51 | 67 | /** |
6bdc9fac AM |
68 | * Last timestamp recorded. |
69 | * | |
70 | * Needed to calculate the complete timestamp values for the events with | |
71 | * compact headers. | |
866e5b51 | 72 | */ |
6bdc9fac AM |
73 | private long lastTimestamp = 0; |
74 | ||
75 | /** CPU id of current packet. */ | |
866e5b51 FC |
76 | private int currentCpu = 0; |
77 | ||
5c7202b5 MK |
78 | private int lostEventsInThisPacket; |
79 | ||
c26d0fe0 AM |
80 | private long lostEventsDuration; |
81 | ||
82 | private boolean hasLost = false; | |
83 | ||
866e5b51 | 84 | // ------------------------------------------------------------------------ |
6bdc9fac | 85 | // Constructors |
866e5b51 FC |
86 | // ------------------------------------------------------------------------ |
87 | ||
88 | /** | |
89 | * Constructs a StreamInputPacketReader. | |
90 | * | |
91 | * @param streamInputReader | |
92 | * The StreamInputReader to which this packet reader belongs to. | |
93 | */ | |
94 | public StreamInputPacketReader(StreamInputReader streamInputReader) { | |
95 | this.streamInputReader = streamInputReader; | |
96 | ||
6bdc9fac AM |
97 | /* Set the BitBuffer's byte order. */ |
98 | bitBuffer = new BitBuffer(); | |
99 | bitBuffer.setByteOrder(streamInputReader.getByteOrder()); | |
33656d8e | 100 | |
6bdc9fac AM |
101 | /* Create trace packet header definition. */ |
102 | final Stream currentStream = streamInputReader.getStreamInput().getStream(); | |
103 | StructDeclaration tracePacketHeaderDecl = currentStream.getTrace().getPacketHeader(); | |
104 | if (tracePacketHeaderDecl != null) { | |
105 | tracePacketHeaderDef = tracePacketHeaderDecl.createDefinition(this, "trace.packet.header"); //$NON-NLS-1$ | |
106 | } else { | |
107 | tracePacketHeaderDef = null; | |
108 | } | |
109 | ||
110 | /* Create stream packet context definition. */ | |
111 | StructDeclaration streamPacketContextDecl = currentStream.getPacketContextDecl(); | |
112 | if (streamPacketContextDecl != null) { | |
113 | streamPacketContextDef = streamPacketContextDecl.createDefinition(this, "stream.packet.context"); //$NON-NLS-1$ | |
114 | } else { | |
115 | streamPacketContextDef = null; | |
116 | } | |
117 | ||
118 | /* Create stream event header definition. */ | |
119 | StructDeclaration streamEventHeaderDecl = currentStream.getEventHeaderDecl(); | |
120 | if (streamEventHeaderDecl != null) { | |
121 | streamEventHeaderDef = streamEventHeaderDecl.createDefinition(this, "stream.event.header"); //$NON-NLS-1$ | |
122 | } else { | |
123 | streamEventHeaderDef = null; | |
124 | } | |
125 | ||
126 | /* Create stream event context definition. */ | |
127 | StructDeclaration streamEventContextDecl = currentStream.getEventContextDecl(); | |
128 | if (streamEventContextDecl != null) { | |
129 | streamEventContextDef = streamEventContextDecl.createDefinition(this, "stream.event.context"); //$NON-NLS-1$ | |
130 | } else { | |
131 | streamEventContextDef = null; | |
132 | } | |
133 | ||
134 | /* Create event definitions */ | |
8e964be1 | 135 | Collection<IEventDeclaration> eventDecls = streamInputReader.getStreamInput().getStream().getEvents().values(); |
6bdc9fac | 136 | |
8e964be1 | 137 | for (IEventDeclaration event : eventDecls) { |
7ff6d3cf | 138 | if (!streamInputReader.getEventDefinitions().containsKey(event.getId())) { |
6bdc9fac | 139 | EventDefinition eventDef = event.createDefinition(streamInputReader); |
7ff6d3cf | 140 | streamInputReader.addEventDefinition(event.getId(), eventDef); |
6bdc9fac AM |
141 | } |
142 | } | |
143 | } | |
866e5b51 | 144 | |
5d1c6919 PT |
145 | /** |
146 | * Dispose the StreamInputPacketReader | |
c26d0fe0 | 147 | * |
5d1c6919 PT |
148 | * @since 2.0 |
149 | */ | |
150 | public void dispose() { | |
151 | bitBuffer.setByteBuffer(null); | |
152 | } | |
153 | ||
866e5b51 FC |
154 | // ------------------------------------------------------------------------ |
155 | // Getters/Setters/Predicates | |
156 | // ------------------------------------------------------------------------ | |
157 | ||
9ac2eb62 MK |
158 | /** |
159 | * Gets the current packet | |
160 | * | |
161 | * @return the current packet | |
162 | */ | |
486efb2e | 163 | StreamInputPacketIndexEntry getCurrentPacket() { |
866e5b51 FC |
164 | return this.currentPacket; |
165 | } | |
166 | ||
9ac2eb62 MK |
167 | /** |
168 | * Gets the steamPacketContext Definition | |
169 | * | |
170 | * @return steamPacketContext Definition | |
171 | */ | |
866e5b51 FC |
172 | public StructDefinition getStreamPacketContextDef() { |
173 | return this.streamPacketContextDef; | |
174 | } | |
175 | ||
45cbd8dc AM |
176 | /** |
177 | * Gets the stream's event context definition. | |
178 | * | |
179 | * @return The streamEventContext definition | |
180 | */ | |
181 | public StructDefinition getStreamEventContextDef() { | |
182 | return streamEventContextDef; | |
183 | } | |
184 | ||
9ac2eb62 MK |
185 | /** |
186 | * Gets the CPU (core) number | |
187 | * | |
188 | * @return the CPU (core) number | |
189 | */ | |
866e5b51 FC |
190 | public int getCPU() { |
191 | return this.currentCpu; | |
192 | } | |
193 | ||
194 | @Override | |
195 | public String getPath() { | |
196 | return ""; //$NON-NLS-1$ | |
197 | } | |
198 | ||
199 | // ------------------------------------------------------------------------ | |
200 | // Operations | |
201 | // ------------------------------------------------------------------------ | |
202 | ||
866e5b51 FC |
203 | /** |
204 | * Changes the current packet to the given one. | |
205 | * | |
206 | * @param currentPacket | |
207 | * The index entry of the packet to switch to. | |
db8e8f7d AM |
208 | * @throws CTFReaderException |
209 | * If we get an error reading the packet | |
866e5b51 | 210 | */ |
db8e8f7d | 211 | void setCurrentPacket(StreamInputPacketIndexEntry currentPacket) throws CTFReaderException { |
c26d0fe0 | 212 | StreamInputPacketIndexEntry prevPacket = null; |
866e5b51 FC |
213 | this.currentPacket = currentPacket; |
214 | ||
215 | if (this.currentPacket != null) { | |
216 | /* | |
217 | * Change the map of the BitBuffer. | |
218 | */ | |
219 | MappedByteBuffer bb = null; | |
220 | try { | |
6bdc9fac | 221 | bb = streamInputReader.getStreamInput().getFileChannel() |
788ddcbc MK |
222 | .map(MapMode.READ_ONLY, |
223 | this.currentPacket.getOffsetBytes(), | |
224 | (this.currentPacket.getPacketSizeBits() + 7) / 8); | |
866e5b51 FC |
225 | } catch (IOException e) { |
226 | /* | |
227 | * The streamInputReader object is already allocated, so this | |
228 | * shouldn't fail bar some very bad kernel or RAM errors... | |
229 | */ | |
230 | e.printStackTrace(); | |
231 | } | |
232 | ||
6bdc9fac | 233 | bitBuffer.setByteBuffer(bb); |
866e5b51 FC |
234 | |
235 | /* | |
236 | * Read trace packet header. | |
237 | */ | |
6bdc9fac AM |
238 | if (tracePacketHeaderDef != null) { |
239 | tracePacketHeaderDef.read(bitBuffer); | |
866e5b51 FC |
240 | } |
241 | ||
242 | /* | |
243 | * Read stream packet context. | |
244 | */ | |
245 | if (getStreamPacketContextDef() != null) { | |
6bdc9fac | 246 | getStreamPacketContextDef().read(bitBuffer); |
33656d8e | 247 | |
132a02b0 | 248 | /* Read CPU ID */ |
21fb02fa | 249 | if (this.getCurrentPacket().getTarget() != null) { |
132a02b0 | 250 | this.currentCpu = (int) this.getCurrentPacket().getTargetId(); |
866e5b51 | 251 | } |
21fb02fa | 252 | |
132a02b0 MK |
253 | /* Read number of lost events */ |
254 | lostEventsInThisPacket = (int) this.getCurrentPacket().getLostEvents(); | |
c26d0fe0 AM |
255 | if (lostEventsInThisPacket != 0) { |
256 | hasLost = true; | |
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; | |
263 | int index = this.streamInputReader.getStreamInput().getIndex().getEntries().indexOf(currentPacket); | |
264 | if (index == 0) { | |
265 | lostEventsStartTime = currentPacket.getTimestampBegin() + 1; | |
266 | } else { | |
267 | prevPacket = this.streamInputReader.getStreamInput().getIndex().getEntries().get(index - 1); | |
268 | lostEventsStartTime = prevPacket.getTimestampEnd(); | |
269 | } | |
270 | lostEventsDuration = Math.abs(lostEventsStartTime - currentPacket.getTimestampBegin()); | |
271 | } | |
866e5b51 FC |
272 | } |
273 | ||
274 | /* | |
275 | * Use the timestamp begin of the packet as the reference for the | |
276 | * timestamp reconstitution. | |
277 | */ | |
ce2388e0 | 278 | lastTimestamp = currentPacket.getTimestampBegin(); |
866e5b51 | 279 | } else { |
6bdc9fac | 280 | bitBuffer.setByteBuffer(null); |
866e5b51 FC |
281 | |
282 | lastTimestamp = 0; | |
283 | } | |
284 | } | |
285 | ||
286 | /** | |
287 | * Returns whether it is possible to read any more events from this packet. | |
288 | * | |
289 | * @return True if it is possible to read any more events from this packet. | |
290 | */ | |
291 | public boolean hasMoreEvents() { | |
292 | if (currentPacket != null) { | |
c26d0fe0 | 293 | return hasLost || (bitBuffer.position() < currentPacket.getContentSizeBits()); |
866e5b51 FC |
294 | } |
295 | return false; | |
296 | } | |
297 | ||
298 | /** | |
299 | * Reads the next event of the packet into the right event definition. | |
300 | * | |
301 | * @return The event definition containing the event data that was just | |
302 | * read. | |
303 | * @throws CTFReaderException | |
be6df2d8 | 304 | * If there was a problem reading the trace |
866e5b51 FC |
305 | */ |
306 | public EventDefinition readNextEvent() throws CTFReaderException { | |
1fbaecd1 | 307 | /* Default values for those fields */ |
b73145e2 | 308 | long eventID = EventDeclaration.UNSET_EVENT_ID; |
866e5b51 | 309 | long timestamp = 0; |
c26d0fe0 AM |
310 | if (hasLost) { |
311 | hasLost = false; | |
6bdc9fac | 312 | EventDefinition eventDef = EventDeclaration.getLostEventDeclaration().createDefinition(streamInputReader); |
c26d0fe0 AM |
313 | ((IntegerDefinition) eventDef.getFields().getDefinitions().get(CTFStrings.LOST_EVENTS_FIELD)).setValue(lostEventsInThisPacket); |
314 | ((IntegerDefinition) eventDef.getFields().getDefinitions().get(CTFStrings.LOST_EVENTS_DURATION)).setValue(lostEventsDuration); | |
aa572e22 | 315 | eventDef.setTimestamp(this.lastTimestamp); |
33656d8e MK |
316 | return eventDef; |
317 | } | |
132a02b0 | 318 | |
6bdc9fac AM |
319 | final StructDefinition sehd = streamEventHeaderDef; |
320 | final BitBuffer currentBitBuffer = bitBuffer; | |
2b7f6f09 | 321 | |
1fbaecd1 | 322 | /* Read the stream event header. */ |
2b7f6f09 MK |
323 | if (sehd != null) { |
324 | sehd.read(currentBitBuffer); | |
866e5b51 | 325 | |
1fbaecd1 AM |
326 | /* Check for the event id. */ |
327 | Definition idDef = sehd.lookupDefinition("id"); //$NON-NLS-1$ | |
328 | if (idDef instanceof SimpleDatatypeDefinition) { | |
329 | eventID = ((SimpleDatatypeDefinition) idDef).getIntegerValue(); | |
330 | } // else, eventID remains 0 | |
866e5b51 | 331 | |
c26d0fe0 AM |
332 | /* |
333 | * Get the timestamp from the event header (may be overridden later | |
334 | * on) | |
335 | */ | |
0594c61c AM |
336 | IntegerDefinition timestampDef = sehd.lookupInteger("timestamp"); //$NON-NLS-1$ |
337 | if (timestampDef != null) { | |
338 | timestamp = calculateTimestamp(timestampDef); | |
6bdc9fac | 339 | } // else timestamp remains 0 |
1fbaecd1 AM |
340 | |
341 | /* Check for the variant v. */ | |
6bdc9fac AM |
342 | Definition variantDef = sehd.lookupDefinition("v"); //$NON-NLS-1$ |
343 | if (variantDef instanceof VariantDefinition) { | |
866e5b51 | 344 | |
1fbaecd1 | 345 | /* Get the variant current field */ |
6bdc9fac | 346 | StructDefinition variantCurrentField = (StructDefinition) ((VariantDefinition) variantDef).getCurrentField(); |
866e5b51 | 347 | |
21fb02fa MK |
348 | /* |
349 | * Try to get the id field in the current field of the variant. | |
350 | * If it is present, it overrides the previously read event id. | |
351 | */ | |
6bdc9fac AM |
352 | Definition idIntegerDef = variantCurrentField.lookupDefinition("id"); //$NON-NLS-1$ |
353 | if (idIntegerDef instanceof IntegerDefinition) { | |
354 | eventID = ((IntegerDefinition) idIntegerDef).getValue(); | |
21fb02fa | 355 | } |
866e5b51 | 356 | |
c26d0fe0 AM |
357 | /* |
358 | * Get the timestamp. This would overwrite any previous | |
359 | * timestamp definition | |
360 | */ | |
0594c61c AM |
361 | Definition def = variantCurrentField.lookupDefinition("timestamp"); //$NON-NLS-1$ |
362 | if (def instanceof IntegerDefinition) { | |
363 | timestamp = calculateTimestamp((IntegerDefinition) def); | |
6bdc9fac | 364 | } |
21fb02fa | 365 | } |
866e5b51 FC |
366 | } |
367 | ||
1fbaecd1 AM |
368 | /* Read the stream event context. */ |
369 | if (streamEventContextDef != null) { | |
370 | streamEventContextDef.read(currentBitBuffer); | |
866e5b51 FC |
371 | } |
372 | ||
1fbaecd1 | 373 | /* Get the right event definition using the event id. */ |
7ff6d3cf | 374 | EventDefinition eventDef = streamInputReader.getEventDefinitions().get(eventID); |
866e5b51 FC |
375 | if (eventDef == null) { |
376 | throw new CTFReaderException("Incorrect event id : " + eventID); //$NON-NLS-1$ | |
377 | } | |
378 | ||
1fbaecd1 | 379 | /* Read the event context. */ |
87b60a47 MK |
380 | if (eventDef.getEventContext() != null) { |
381 | eventDef.getEventContext().read(currentBitBuffer); | |
866e5b51 FC |
382 | } |
383 | ||
1fbaecd1 | 384 | /* Read the event fields. */ |
aa572e22 MK |
385 | if (eventDef.getFields() != null) { |
386 | eventDef.getFields().read(currentBitBuffer); | |
866e5b51 FC |
387 | } |
388 | ||
389 | /* | |
390 | * Set the event timestamp using the timestamp calculated by | |
391 | * updateTimestamp. | |
392 | */ | |
aa572e22 | 393 | eventDef.setTimestamp(timestamp); |
866e5b51 FC |
394 | |
395 | return eventDef; | |
396 | } | |
397 | ||
398 | /** | |
399 | * Calculates the timestamp value of the event, possibly using the timestamp | |
400 | * from the last event. | |
401 | * | |
402 | * @param timestampDef | |
403 | * Integer definition of the timestamp. | |
404 | * @return The calculated timestamp value. | |
405 | */ | |
406 | private long calculateTimestamp(IntegerDefinition timestampDef) { | |
407 | long newval; | |
408 | long majorasbitmask; | |
409 | int len = timestampDef.getDeclaration().getLength(); | |
410 | ||
411 | /* | |
412 | * If the timestamp length is 64 bits, it is a full timestamp. | |
413 | */ | |
414 | if (timestampDef.getDeclaration().getLength() == 64) { | |
415 | lastTimestamp = timestampDef.getValue(); | |
416 | return lastTimestamp; | |
417 | } | |
418 | ||
419 | /* | |
420 | * Bit mask to keep / remove all old / new bits. | |
421 | */ | |
422 | majorasbitmask = (1L << len) - 1; | |
423 | ||
424 | /* | |
425 | * If the new value is smaller than the corresponding bits of the last | |
426 | * timestamp, we assume an overflow of the compact representation. | |
427 | */ | |
428 | newval = timestampDef.getValue(); | |
429 | if (newval < (lastTimestamp & majorasbitmask)) { | |
430 | newval = newval + (1L << len); | |
431 | } | |
432 | ||
433 | /* Keep only the high bits of the old value */ | |
434 | lastTimestamp = lastTimestamp & ~majorasbitmask; | |
435 | ||
436 | /* Then add the low bits of the new value */ | |
437 | lastTimestamp = lastTimestamp + newval; | |
438 | ||
439 | return lastTimestamp; | |
440 | } | |
441 | ||
442 | @Override | |
443 | public Definition lookupDefinition(String lookupPath) { | |
866e5b51 FC |
444 | return null; |
445 | } | |
866e5b51 | 446 | } |