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1 | /******************************************************************************* |
2 | * Copyright (c) 2011-2012 Ericsson, Ecole Polytechnique de Montreal and others | |
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; | |
18 | import java.util.HashMap; | |
19 | ||
20 | import org.eclipse.linuxtools.ctf.core.event.EventDeclaration; | |
21 | import org.eclipse.linuxtools.ctf.core.event.EventDefinition; | |
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22 | import org.eclipse.linuxtools.ctf.core.event.types.Definition; |
23 | import org.eclipse.linuxtools.ctf.core.event.types.EnumDefinition; | |
24 | import org.eclipse.linuxtools.ctf.core.event.types.IDefinitionScope; | |
25 | import org.eclipse.linuxtools.ctf.core.event.types.IntegerDefinition; | |
26 | import org.eclipse.linuxtools.ctf.core.event.types.StructDeclaration; | |
27 | import org.eclipse.linuxtools.ctf.core.event.types.StructDefinition; | |
28 | import org.eclipse.linuxtools.ctf.core.event.types.VariantDefinition; | |
769f614a | 29 | import org.eclipse.linuxtools.internal.ctf.core.event.io.BitBuffer; |
83603224 | 30 | import org.eclipse.linuxtools.internal.ctf.core.trace.Stream; |
769f614a | 31 | import org.eclipse.linuxtools.internal.ctf.core.trace.StreamInputPacketIndexEntry; |
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32 | |
33 | /** | |
34 | * <b><u>StreamInputPacketReader</u></b> | |
35 | * <p> | |
36 | * Reads the events of a packet of a trace file. | |
37 | */ | |
83603224 | 38 | class StreamInputPacketReader implements IDefinitionScope { |
866e5b51 FC |
39 | |
40 | // ------------------------------------------------------------------------ | |
41 | // Constants | |
42 | // ------------------------------------------------------------------------ | |
43 | ||
44 | /** | |
45 | * Reference to the index entry of the current packet. | |
46 | */ | |
47 | private StreamInputPacketIndexEntry currentPacket = null; | |
48 | ||
49 | /** | |
50 | * BitBuffer used to read the trace file. | |
51 | */ | |
52 | private final BitBuffer bitBuffer = new BitBuffer(); | |
53 | ||
54 | /** | |
55 | * StreamInputReader that uses this StreamInputPacketReader. | |
56 | */ | |
57 | private final StreamInputReader streamInputReader; | |
58 | ||
59 | /** | |
60 | * Last timestamp recorded. | |
61 | * | |
62 | * Needed to calculate the complete timestamp values for the events with | |
63 | * compact headers. | |
64 | */ | |
65 | private long lastTimestamp = 0; | |
66 | ||
67 | /** | |
68 | * Trace packet header. | |
69 | */ | |
70 | private StructDefinition tracePacketHeaderDef = null; | |
71 | ||
72 | /** | |
73 | * Stream packet context definition. | |
74 | */ | |
75 | private StructDefinition streamPacketContextDef = null; | |
76 | ||
77 | /** | |
78 | * Stream event header definition. | |
79 | */ | |
80 | private StructDefinition streamEventHeaderDef = null; | |
81 | ||
82 | /** | |
83 | * Stream event context definition. | |
84 | */ | |
85 | private StructDefinition streamEventContextDef = null; | |
86 | ||
87 | /** | |
88 | * Maps event ID to event definitions. | |
89 | */ | |
90 | private final HashMap<Long, EventDefinition> events = new HashMap<Long, EventDefinition>(); | |
91 | ||
92 | /** | |
93 | * CPU id of current packet. | |
94 | */ | |
95 | private int currentCpu = 0; | |
96 | ||
97 | // ------------------------------------------------------------------------ | |
98 | // Attributes | |
99 | // ------------------------------------------------------------------------ | |
100 | ||
101 | /** | |
102 | * Constructs a StreamInputPacketReader. | |
103 | * | |
104 | * @param streamInputReader | |
105 | * The StreamInputReader to which this packet reader belongs to. | |
106 | */ | |
107 | public StreamInputPacketReader(StreamInputReader streamInputReader) { | |
108 | this.streamInputReader = streamInputReader; | |
109 | ||
110 | /* | |
111 | * Set the BitBuffer's byte order. | |
112 | */ | |
83603224 | 113 | getBitBuffer().setByteOrder(streamInputReader.getByteOrder()); |
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114 | |
115 | /* | |
116 | * Create definitions needed to read the events. | |
117 | */ | |
118 | createDefinitions(); | |
119 | } | |
120 | ||
121 | // ------------------------------------------------------------------------ | |
122 | // Constructors | |
123 | // ------------------------------------------------------------------------ | |
124 | ||
125 | // ------------------------------------------------------------------------ | |
126 | // Getters/Setters/Predicates | |
127 | // ------------------------------------------------------------------------ | |
128 | ||
129 | /* Getters, setters and stuff. */ | |
130 | ||
131 | public StreamInputPacketIndexEntry getCurrentPacket() { | |
132 | return this.currentPacket; | |
133 | } | |
134 | ||
135 | public StructDefinition getStreamPacketContextDef() { | |
136 | return this.streamPacketContextDef; | |
137 | } | |
138 | ||
139 | public int getCPU() { | |
140 | return this.currentCpu; | |
141 | } | |
142 | ||
143 | @Override | |
144 | public String getPath() { | |
145 | return ""; //$NON-NLS-1$ | |
146 | } | |
147 | ||
148 | // ------------------------------------------------------------------------ | |
149 | // Operations | |
150 | // ------------------------------------------------------------------------ | |
151 | ||
152 | /** | |
153 | * Creates definitions needed to read events (stream-defined and | |
154 | * event-defined). | |
155 | */ | |
156 | private void createDefinitions() { | |
157 | /* | |
158 | * Create trace packet header definition. | |
159 | */ | |
160 | final Stream currentStream = getStreamInputReader().getStreamInput().getStream(); | |
161 | StructDeclaration tracePacketHeaderDecl = currentStream.getTrace().getPacketHeader(); | |
162 | if (tracePacketHeaderDecl != null) { | |
163 | setTracePacketHeaderDef(tracePacketHeaderDecl.createDefinition(this, | |
164 | "trace.packet.header")); //$NON-NLS-1$ | |
165 | } | |
166 | ||
167 | /* | |
168 | * Create stream packet context definition. | |
169 | */ | |
170 | StructDeclaration streamPacketContextDecl = currentStream.getPacketContextDecl(); | |
171 | if (streamPacketContextDecl != null) { | |
172 | setStreamPacketContextDef(streamPacketContextDecl.createDefinition( | |
173 | this, "stream.packet.context")); //$NON-NLS-1$ | |
174 | } | |
175 | ||
176 | /* | |
177 | * Create stream event header definition. | |
178 | */ | |
179 | StructDeclaration streamEventHeaderDecl = currentStream.getEventHeaderDecl(); | |
180 | if (streamEventHeaderDecl != null) { | |
181 | setStreamEventHeaderDef(streamEventHeaderDecl.createDefinition(this, | |
182 | "stream.event.header")); //$NON-NLS-1$ | |
183 | } | |
184 | ||
185 | /* | |
186 | * Create stream event context definition. | |
187 | */ | |
188 | StructDeclaration streamEventContextDecl = currentStream.getEventContextDecl(); | |
189 | if (streamEventContextDecl != null) { | |
190 | setStreamEventContextDef(streamEventContextDecl.createDefinition( | |
191 | this, "stream.event.context")); //$NON-NLS-1$ | |
192 | } | |
193 | ||
194 | createEventDefinitions(); | |
195 | } | |
196 | ||
197 | /** | |
198 | * Creates definitions needed to read the event. (event-defined). | |
199 | */ | |
200 | private void createEventDefinitions() { | |
201 | Collection<EventDeclaration> eventDecls = getStreamInputReader().getStreamInput().getStream().getEvents().values(); | |
202 | ||
203 | /* | |
204 | * Create definitions for each event. | |
205 | */ | |
206 | for (EventDeclaration event : eventDecls) { | |
207 | EventDefinition eventDef = event.createDefinition(getStreamInputReader()); | |
208 | ||
209 | events.put(event.getId(), eventDef); | |
210 | } | |
211 | } | |
212 | ||
213 | /** | |
214 | * Changes the current packet to the given one. | |
215 | * | |
216 | * @param currentPacket | |
217 | * The index entry of the packet to switch to. | |
218 | */ | |
219 | public void setCurrentPacket(StreamInputPacketIndexEntry currentPacket) { | |
220 | this.currentPacket = currentPacket; | |
221 | ||
222 | if (this.currentPacket != null) { | |
223 | /* | |
224 | * Change the map of the BitBuffer. | |
225 | */ | |
226 | MappedByteBuffer bb = null; | |
227 | try { | |
228 | bb = getStreamInputReader().getStreamInput().getFileChannel().map( | |
f37679e7 MK |
229 | MapMode.READ_ONLY, this.currentPacket.getOffsetBytes(), |
230 | (this.currentPacket.getPacketSizeBits() + 7) / 8); | |
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231 | } catch (IOException e) { |
232 | /* | |
233 | * The streamInputReader object is already allocated, so this | |
234 | * shouldn't fail bar some very bad kernel or RAM errors... | |
235 | */ | |
236 | e.printStackTrace(); | |
237 | } | |
238 | ||
239 | getBitBuffer().setByteBuffer(bb); | |
240 | ||
241 | /* | |
242 | * Read trace packet header. | |
243 | */ | |
244 | if (getTracePacketHeaderDef() != null) { | |
245 | getTracePacketHeaderDef().read(getBitBuffer()); | |
246 | } | |
247 | ||
248 | /* | |
249 | * Read stream packet context. | |
250 | */ | |
251 | if (getStreamPacketContextDef() != null) { | |
252 | getStreamPacketContextDef().read(getBitBuffer()); | |
253 | Definition cpuiddef = getStreamPacketContextDef().lookupDefinition("cpu_id"); //$NON-NLS-1$ | |
254 | if (cpuiddef instanceof IntegerDefinition) { | |
255 | currentCpu = (int) ((IntegerDefinition) cpuiddef).getValue(); | |
256 | } | |
257 | } | |
258 | ||
259 | /* | |
260 | * Use the timestamp begin of the packet as the reference for the | |
261 | * timestamp reconstitution. | |
262 | */ | |
f37679e7 | 263 | lastTimestamp = currentPacket.getTimestampBegin(); |
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264 | } else { |
265 | getBitBuffer().setByteBuffer(null); | |
266 | ||
267 | lastTimestamp = 0; | |
268 | } | |
269 | } | |
270 | ||
271 | /** | |
272 | * Returns whether it is possible to read any more events from this packet. | |
273 | * | |
274 | * @return True if it is possible to read any more events from this packet. | |
275 | */ | |
276 | public boolean hasMoreEvents() { | |
277 | if (currentPacket != null) { | |
f37679e7 | 278 | return getBitBuffer().position() < currentPacket.getContentSizeBits(); |
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279 | } |
280 | return false; | |
281 | } | |
282 | ||
283 | /** | |
284 | * Reads the next event of the packet into the right event definition. | |
285 | * | |
286 | * @return The event definition containing the event data that was just | |
287 | * read. | |
288 | * @throws CTFReaderException | |
289 | */ | |
290 | public EventDefinition readNextEvent() throws CTFReaderException { | |
291 | /* WARNING: This is very LTTng-specific. */ | |
292 | ||
293 | Long eventID = null; | |
294 | long timestamp = 0; | |
295 | ||
296 | /* | |
297 | * Read thestream event header. | |
298 | */ | |
299 | if (getStreamEventHeaderDef() != null) { | |
300 | getStreamEventHeaderDef().read(getBitBuffer()); | |
301 | ||
302 | /* | |
303 | * Check for an event id. | |
304 | */ | |
305 | EnumDefinition idEnumDef = (EnumDefinition) getStreamEventHeaderDef().lookupDefinition("id"); //$NON-NLS-1$ | |
306 | assert (idEnumDef != null); | |
307 | ||
308 | eventID = idEnumDef.getIntegerValue(); | |
309 | ||
310 | /* | |
311 | * Check for the variant v. | |
312 | */ | |
313 | VariantDefinition variantDef = (VariantDefinition) getStreamEventHeaderDef().lookupDefinition("v"); //$NON-NLS-1$ | |
314 | assert (variantDef != null); | |
315 | ||
316 | /* | |
317 | * Get the variant current field | |
318 | */ | |
319 | StructDefinition variantCurrentField = (StructDefinition) variantDef.getCurrentField(); | |
320 | assert (variantCurrentField != null); | |
321 | ||
322 | /* | |
323 | * Try to get the id field in the current field of the variant. If | |
324 | * it is present, it overrides the previously read event id. | |
325 | */ | |
326 | IntegerDefinition idIntegerDef = (IntegerDefinition) variantCurrentField.lookupDefinition("id"); //$NON-NLS-1$ | |
327 | if (idIntegerDef != null) { | |
328 | eventID = idIntegerDef.getValue(); | |
329 | ||
330 | } | |
331 | ||
332 | /* | |
333 | * Get the timestamp. | |
334 | */ | |
335 | IntegerDefinition timestampDef = (IntegerDefinition) variantCurrentField.lookupDefinition("timestamp"); //$NON-NLS-1$ | |
336 | assert (timestampDef != null); | |
337 | ||
338 | /* | |
339 | * Calculate the event timestamp. | |
340 | */ | |
341 | timestamp = calculateTimestamp(timestampDef); | |
342 | } | |
343 | ||
344 | /* | |
345 | * Read the stream event context. | |
346 | */ | |
347 | if (getStreamEventContextDef() != null) { | |
348 | getStreamEventContextDef().read(getBitBuffer()); | |
349 | } | |
350 | ||
351 | /* | |
352 | * Get the right event definition using the event id. | |
353 | */ | |
354 | EventDefinition eventDef = events.get(eventID); | |
355 | if (eventDef == null) { | |
356 | throw new CTFReaderException("Incorrect event id : " + eventID); //$NON-NLS-1$ | |
357 | } | |
358 | ||
359 | /* | |
360 | * Read the event context. | |
361 | */ | |
362 | if (eventDef.context != null) { | |
363 | eventDef.context.read(getBitBuffer()); | |
364 | } | |
365 | ||
366 | /* | |
367 | * Read the event fields. | |
368 | */ | |
369 | if (eventDef.fields != null) { | |
370 | eventDef.fields.read(getBitBuffer()); | |
371 | } | |
372 | ||
373 | /* | |
374 | * Set the event timestamp using the timestamp calculated by | |
375 | * updateTimestamp. | |
376 | */ | |
377 | eventDef.timestamp = timestamp; | |
378 | ||
379 | return eventDef; | |
380 | } | |
381 | ||
382 | /** | |
383 | * Calculates the timestamp value of the event, possibly using the timestamp | |
384 | * from the last event. | |
385 | * | |
386 | * @param timestampDef | |
387 | * Integer definition of the timestamp. | |
388 | * @return The calculated timestamp value. | |
389 | */ | |
390 | private long calculateTimestamp(IntegerDefinition timestampDef) { | |
391 | long newval; | |
392 | long majorasbitmask; | |
393 | int len = timestampDef.getDeclaration().getLength(); | |
394 | ||
395 | /* | |
396 | * If the timestamp length is 64 bits, it is a full timestamp. | |
397 | */ | |
398 | if (timestampDef.getDeclaration().getLength() == 64) { | |
399 | lastTimestamp = timestampDef.getValue(); | |
400 | return lastTimestamp; | |
401 | } | |
402 | ||
403 | /* | |
404 | * Bit mask to keep / remove all old / new bits. | |
405 | */ | |
406 | majorasbitmask = (1L << len) - 1; | |
407 | ||
408 | /* | |
409 | * If the new value is smaller than the corresponding bits of the last | |
410 | * timestamp, we assume an overflow of the compact representation. | |
411 | */ | |
412 | newval = timestampDef.getValue(); | |
413 | if (newval < (lastTimestamp & majorasbitmask)) { | |
414 | newval = newval + (1L << len); | |
415 | } | |
416 | ||
417 | /* Keep only the high bits of the old value */ | |
418 | lastTimestamp = lastTimestamp & ~majorasbitmask; | |
419 | ||
420 | /* Then add the low bits of the new value */ | |
421 | lastTimestamp = lastTimestamp + newval; | |
422 | ||
423 | return lastTimestamp; | |
424 | } | |
425 | ||
426 | @Override | |
427 | public Definition lookupDefinition(String lookupPath) { | |
428 | // TODO Auto-generated method stub | |
429 | return null; | |
430 | } | |
431 | ||
432 | public StructDefinition getStreamEventContextDef() { | |
433 | return this.streamEventContextDef; | |
434 | } | |
435 | ||
436 | public void setStreamEventContextDef(StructDefinition streamEventContextDef) { | |
437 | this.streamEventContextDef = streamEventContextDef; | |
438 | } | |
439 | ||
440 | public StructDefinition getStreamEventHeaderDef() { | |
441 | return this.streamEventHeaderDef; | |
442 | } | |
443 | ||
444 | public void setStreamEventHeaderDef(StructDefinition streamEventHeaderDef) { | |
445 | this.streamEventHeaderDef = streamEventHeaderDef; | |
446 | } | |
447 | ||
448 | public void setStreamPacketContextDef(StructDefinition streamPacketContextDef) { | |
449 | this.streamPacketContextDef = streamPacketContextDef; | |
450 | } | |
451 | ||
452 | public StructDefinition getTracePacketHeaderDef() { | |
453 | return this.tracePacketHeaderDef; | |
454 | } | |
455 | ||
456 | public void setTracePacketHeaderDef(StructDefinition tracePacketHeaderDef) { | |
457 | this.tracePacketHeaderDef = tracePacketHeaderDef; | |
458 | } | |
459 | ||
460 | public StreamInputReader getStreamInputReader() { | |
461 | return this.streamInputReader; | |
462 | } | |
463 | ||
464 | public BitBuffer getBitBuffer() { | |
465 | return bitBuffer; | |
466 | } | |
467 | } |