analysis/org.eclipse.tracecompass.analysis.os.linux.ui/src/org/eclipse/tracecompass/internal/analysis/os/linux/ui/views/controlflow/ControlFlowView.java

   1 /*******************************************************************************
   2  * Copyright (c) 2012, 2016 Ericsson, École Polytechnique de Montréal and others.
   3  *
   4  * All rights reserved. This program and the accompanying materials are
   5  * made 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:
  10  *   Patrick Tasse - Initial API and implementation
  11  *   Geneviève Bastien - Move code to provide base classes for time graph view
  12  *   Christian Mansky - Add check active / uncheck inactive buttons
  13  *******************************************************************************/
  14
  15 package org.eclipse.tracecompass.internal.analysis.os.linux.ui.views.controlflow;
  16
  17 import java.util.ArrayList;
  18 import java.util.Comparator;
  19 import java.util.HashMap;
  20 import java.util.List;
  21 import java.util.Map;
  22
  23 import org.eclipse.core.runtime.IProgressMonitor;
  24 import org.eclipse.jdt.annotation.NonNull;
  25 import org.eclipse.jdt.annotation.Nullable;
  26 import org.eclipse.jface.action.IAction;
  27 import org.eclipse.jface.action.IMenuManager;
  28 import org.eclipse.jface.action.IToolBarManager;
  29 import org.eclipse.jface.dialogs.IDialogSettings;
  30 import org.eclipse.jface.viewers.ISelection;
  31 import org.eclipse.jface.viewers.StructuredSelection;
  32 import org.eclipse.swt.widgets.Composite;
  33 import org.eclipse.tracecompass.analysis.os.linux.core.kernel.KernelAnalysisModule;
  34 import org.eclipse.tracecompass.internal.analysis.os.linux.core.kernel.Attributes;
  35 import org.eclipse.tracecompass.internal.analysis.os.linux.ui.Activator;
  36 import org.eclipse.tracecompass.internal.analysis.os.linux.ui.Messages;
  37 import org.eclipse.tracecompass.internal.analysis.os.linux.ui.actions.FollowThreadAction;
  38 import org.eclipse.tracecompass.statesystem.core.ITmfStateSystem;
  39 import org.eclipse.tracecompass.statesystem.core.exceptions.AttributeNotFoundException;
  40 import org.eclipse.tracecompass.statesystem.core.exceptions.StateSystemDisposedException;
  41 import org.eclipse.tracecompass.statesystem.core.exceptions.StateValueTypeException;
  42 import org.eclipse.tracecompass.statesystem.core.exceptions.TimeRangeException;
  43 import org.eclipse.tracecompass.statesystem.core.interval.ITmfStateInterval;
  44 import org.eclipse.tracecompass.statesystem.core.statevalue.ITmfStateValue;
  45 import org.eclipse.tracecompass.tmf.core.statesystem.TmfStateSystemAnalysisModule;
  46 import org.eclipse.tracecompass.tmf.core.trace.ITmfTrace;
  47 import org.eclipse.tracecompass.tmf.core.trace.TmfTraceManager;
  48 import org.eclipse.tracecompass.tmf.core.util.Pair;
  49 import org.eclipse.tracecompass.tmf.ui.views.timegraph.AbstractStateSystemTimeGraphView;
  50 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.ILinkEvent;
  51 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.ITimeEvent;
  52 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.ITimeGraphEntry;
  53 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.NullTimeEvent;
  54 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.TimeEvent;
  55 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.TimeGraphEntry;
  56 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.TimeLinkEvent;
  57 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.widgets.Utils;
  58 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.widgets.Utils.Resolution;
  59 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.widgets.Utils.TimeFormat;
  60
  61 import com.google.common.collect.ImmutableList;
  62
  63 /**
  64  * The Control Flow view main object
  65  *
  66  */
  67 public class ControlFlowView extends AbstractStateSystemTimeGraphView {
  68
  69     // ------------------------------------------------------------------------
  70     // Constants
  71     // ------------------------------------------------------------------------
  72     /**
  73      * View ID.
  74      */
  75     public static final String ID = "org.eclipse.tracecompass.analysis.os.linux.views.controlflow"; //$NON-NLS-1$
  76
  77     private static final String PROCESS_COLUMN = Messages.ControlFlowView_processColumn;
  78     private static final String TID_COLUMN = Messages.ControlFlowView_tidColumn;
  79     private static final String PTID_COLUMN = Messages.ControlFlowView_ptidColumn;
  80     private static final String BIRTH_TIME_COLUMN = Messages.ControlFlowView_birthTimeColumn;
  81     private static final String TRACE_COLUMN = Messages.ControlFlowView_traceColumn;
  82
  83     private static final String[] COLUMN_NAMES = new String[] {
  84             PROCESS_COLUMN,
  85             TID_COLUMN,
  86             PTID_COLUMN,
  87             BIRTH_TIME_COLUMN,
  88             TRACE_COLUMN
  89     };
  90
  91     private static final String[] FILTER_COLUMN_NAMES = new String[] {
  92             PROCESS_COLUMN,
  93             TID_COLUMN
  94     };
  95
  96     // Timeout between updates in the build thread in ms
  97     private static final long BUILD_UPDATE_TIMEOUT = 500;
  98
  99     private static final Comparator<ITimeGraphEntry>[] COLUMN_COMPARATORS;
 100
 101     private static final int INITIAL_SORT_COLUMN_INDEX = 3;
 102
 103     static {
 104         ImmutableList.Builder<Comparator<ITimeGraphEntry>> builder = ImmutableList.builder();
 105         builder.add(ControlFlowColumnComparators.PROCESS_NAME_COLUMN_COMPARATOR)
 106             .add(ControlFlowColumnComparators.TID_COLUMN_COMPARATOR)
 107             .add(ControlFlowColumnComparators.PTID_COLUMN_COMPARATOR)
 108             .add(ControlFlowColumnComparators.BIRTH_TIME_COLUMN_COMPARATOR)
 109             .add(ControlFlowColumnComparators.TRACE_COLUMN_COMPARATOR);
 110         List<Comparator<ITimeGraphEntry>> l = builder.build();
 111         COLUMN_COMPARATORS = l.toArray(new Comparator[l.size()]);
 112     }
 113
 114     // ------------------------------------------------------------------------
 115     // Constructors
 116     // ------------------------------------------------------------------------
 117
 118     /**
 119      * Constructor
 120      */
 121     public ControlFlowView() {
 122         super(ID, new ControlFlowPresentationProvider());
 123         setTreeColumns(COLUMN_NAMES, COLUMN_COMPARATORS, INITIAL_SORT_COLUMN_INDEX);
 124         setTreeLabelProvider(new ControlFlowTreeLabelProvider());
 125         setFilterColumns(FILTER_COLUMN_NAMES);
 126         setFilterLabelProvider(new ControlFlowFilterLabelProvider());
 127         setEntryComparator(ControlFlowColumnComparators.BIRTH_TIME_COLUMN_COMPARATOR);
 128     }
 129
 130     @Override
 131     public void createPartControl(Composite parent) {
 132         super.createPartControl(parent);
 133         // add "Check active" Button to TimeGraphFilterDialog
 134         super.getTimeGraphCombo().addTimeGraphFilterCheckActiveButton(
 135                 new ControlFlowCheckActiveProvider(Messages.ControlFlowView_checkActiveLabel, Messages.ControlFlowView_checkActiveToolTip));
 136         // add "Uncheck inactive" Button to TimeGraphFilterDialog
 137         super.getTimeGraphCombo().addTimeGraphFilterUncheckInactiveButton(
 138                 new ControlFlowCheckActiveProvider(Messages.ControlFlowView_uncheckInactiveLabel, Messages.ControlFlowView_uncheckInactiveToolTip));
 139     }
 140
 141     /**
 142      * @since 2.0
 143      */
 144     @Override
 145     protected void fillTimeGraphEntryContextMenu(@NonNull IMenuManager menuManager) {
 146         ISelection selection = getSite().getSelectionProvider().getSelection();
 147         if (selection instanceof StructuredSelection) {
 148             StructuredSelection sSel = (StructuredSelection) selection;
 149             if (sSel.getFirstElement() instanceof ControlFlowEntry) {
 150                 ControlFlowEntry entry = (ControlFlowEntry) sSel.getFirstElement();
 151                 menuManager.add(new FollowThreadAction(ControlFlowView.this, entry.getName(), entry.getThreadId(), entry.getTrace()));
 152             }
 153         }
 154     }
 155
 156     @Override
 157     protected void fillLocalToolBar(IToolBarManager manager) {
 158         super.fillLocalToolBar(manager);
 159         IDialogSettings settings = Activator.getDefault().getDialogSettings();
 160         IDialogSettings section = settings.getSection(getClass().getName());
 161         if (section == null) {
 162             section = settings.addNewSection(getClass().getName());
 163         }
 164
 165         IAction hideArrowsAction = getTimeGraphCombo().getTimeGraphViewer().getHideArrowsAction(section);
 166         manager.add(hideArrowsAction);
 167
 168         IAction followArrowBwdAction = getTimeGraphCombo().getTimeGraphViewer().getFollowArrowBwdAction();
 169         followArrowBwdAction.setText(Messages.ControlFlowView_followCPUBwdText);
 170         followArrowBwdAction.setToolTipText(Messages.ControlFlowView_followCPUBwdText);
 171         manager.add(followArrowBwdAction);
 172
 173         IAction followArrowFwdAction = getTimeGraphCombo().getTimeGraphViewer().getFollowArrowFwdAction();
 174         followArrowFwdAction.setText(Messages.ControlFlowView_followCPUFwdText);
 175         followArrowFwdAction.setToolTipText(Messages.ControlFlowView_followCPUFwdText);
 176         manager.add(followArrowFwdAction);
 177     }
 178
 179     @Override
 180     protected String getNextText() {
 181         return Messages.ControlFlowView_nextProcessActionNameText;
 182     }
 183
 184     @Override
 185     protected String getNextTooltip() {
 186         return Messages.ControlFlowView_nextProcessActionToolTipText;
 187     }
 188
 189     @Override
 190     protected String getPrevText() {
 191         return Messages.ControlFlowView_previousProcessActionNameText;
 192     }
 193
 194     @Override
 195     protected String getPrevTooltip() {
 196         return Messages.ControlFlowView_previousProcessActionToolTipText;
 197     }
 198
 199     /**
 200      * @author gbastien
 201      *
 202      */
 203     protected static class ControlFlowTreeLabelProvider extends TreeLabelProvider {
 204
 205         @Override
 206         public String getColumnText(Object element, int columnIndex) {
 207             ControlFlowEntry entry = (ControlFlowEntry) element;
 208
 209             if (COLUMN_NAMES[columnIndex].equals(Messages.ControlFlowView_processColumn)) {
 210                 return entry.getName();
 211             } else if (COLUMN_NAMES[columnIndex].equals(Messages.ControlFlowView_tidColumn)) {
 212                 return Integer.toString(entry.getThreadId());
 213             } else if (COLUMN_NAMES[columnIndex].equals(Messages.ControlFlowView_ptidColumn)) {
 214                 if (entry.getParentThreadId() > 0) {
 215                     return Integer.toString(entry.getParentThreadId());
 216                 }
 217             } else if (COLUMN_NAMES[columnIndex].equals(Messages.ControlFlowView_birthTimeColumn)) {
 218                 return Utils.formatTime(entry.getStartTime(), TimeFormat.CALENDAR, Resolution.NANOSEC);
 219             } else if (COLUMN_NAMES[columnIndex].equals(Messages.ControlFlowView_traceColumn)) {
 220                 return entry.getTrace().getName();
 221             }
 222             return ""; //$NON-NLS-1$
 223         }
 224
 225     }
 226
 227     private static class ControlFlowFilterLabelProvider extends TreeLabelProvider {
 228
 229         @Override
 230         public String getColumnText(Object element, int columnIndex) {
 231             ControlFlowEntry entry = (ControlFlowEntry) element;
 232
 233             if (columnIndex == 0) {
 234                 return entry.getName();
 235             } else if (columnIndex == 1) {
 236                 return Integer.toString(entry.getThreadId());
 237             }
 238             return ""; //$NON-NLS-1$
 239         }
 240
 241     }
 242
 243     // ------------------------------------------------------------------------
 244     // Internal
 245     // ------------------------------------------------------------------------
 246
 247     @Override
 248     protected void buildEntryList(final ITmfTrace trace, final ITmfTrace parentTrace, final IProgressMonitor monitor) {
 249         final ITmfStateSystem ssq = TmfStateSystemAnalysisModule.getStateSystem(trace, KernelAnalysisModule.ID);
 250         if (ssq == null) {
 251             return;
 252         }
 253
 254         final List<ControlFlowEntry> entryList = new ArrayList<>();
 255         /** Map of view entries, key is a pair [threadId, cpuId] */
 256         final Map<Pair<Integer, Integer>, ControlFlowEntry> entryMap = new HashMap<>();
 257
 258         long start = ssq.getStartTime();
 259         setStartTime(Math.min(getStartTime(), start));
 260
 261         boolean complete = false;
 262         while (!complete) {
 263             if (monitor.isCanceled()) {
 264                 return;
 265             }
 266             complete = ssq.waitUntilBuilt(BUILD_UPDATE_TIMEOUT);
 267             if (ssq.isCancelled()) {
 268                 return;
 269             }
 270             long end = ssq.getCurrentEndTime();
 271             if (start == end && !complete) { // when complete execute one last time regardless of end time
 272                 continue;
 273             }
 274             final long resolution = Math.max(1, (end - ssq.getStartTime()) / getDisplayWidth());
 275             setEndTime(Math.max(getEndTime(), end + 1));
 276             final List<Integer> threadQuarks = ssq.getQuarks(Attributes.THREADS, "*"); //$NON-NLS-1$
 277             queryFullStates(ssq, start, end, resolution, monitor, new IQueryHandler() {
 278                 @Override
 279                 public void handle(List<List<ITmfStateInterval>> fullStates, List<ITmfStateInterval> prevFullState) {
 280                     for (int threadQuark : threadQuarks) {
 281                         String threadAttributeName = ssq.getAttributeName(threadQuark);
 282
 283                         Pair<Integer, Integer> entryKey = Attributes.parseThreadAttributeName(threadAttributeName);
 284                         int threadId = entryKey.getFirst();
 285
 286                         if (threadId < 0) { // ignore the 'unknown' (-1) thread
 287                             continue;
 288                         }
 289
 290                         int execNameQuark;
 291                         int ppidQuark;
 292                         try {
 293                             execNameQuark = ssq.getQuarkRelative(threadQuark, Attributes.EXEC_NAME);
 294                             ppidQuark = ssq.getQuarkRelative(threadQuark, Attributes.PPID);
 295                         } catch (AttributeNotFoundException e) {
 296                             /* No information on this thread (yet?), skip it for now */
 297                             continue;
 298                         }
 299                         ITmfStateInterval lastExecNameInterval = prevFullState == null || execNameQuark >= prevFullState.size() ? null : prevFullState.get(execNameQuark);
 300                         long lastExecNameStartTime = lastExecNameInterval == null ? -1 : lastExecNameInterval.getStartTime();
 301                         long lastExecNameEndTime = lastExecNameInterval == null ? -1 : lastExecNameInterval.getEndTime() + 1;
 302                         long lastPpidStartTime = prevFullState == null || ppidQuark >= prevFullState.size() ? -1 : prevFullState.get(ppidQuark).getStartTime();
 303                         for (List<ITmfStateInterval> fullState : fullStates) {
 304                             if (monitor.isCanceled()) {
 305                                 return;
 306                             }
 307                             if (execNameQuark >= fullState.size() || ppidQuark >= fullState.size()) {
 308                                 /* No information on this thread (yet?), skip it for now */
 309                                 continue;
 310                             }
 311                             ITmfStateInterval execNameInterval = fullState.get(execNameQuark);
 312                             ITmfStateInterval ppidInterval = fullState.get(ppidQuark);
 313                             long startTime = execNameInterval.getStartTime();
 314                             long endTime = execNameInterval.getEndTime() + 1;
 315                             if (startTime == lastExecNameStartTime && ppidInterval.getStartTime() == lastPpidStartTime) {
 316                                 continue;
 317                             }
 318                             boolean isNull = execNameInterval.getStateValue().isNull();
 319                             if (isNull && lastExecNameEndTime < startTime && lastExecNameEndTime != -1) {
 320                                 /*
 321                                  * There was a non-null interval in between the
 322                                  * full states, try to use it.
 323                                  */
 324                                 try {
 325                                     execNameInterval = ssq.querySingleState(startTime - 1, execNameQuark);
 326                                     ppidInterval = ssq.querySingleState(startTime - 1, ppidQuark);
 327                                     startTime = execNameInterval.getStartTime();
 328                                     endTime = execNameInterval.getEndTime() + 1;
 329                                 } catch (AttributeNotFoundException e) {
 330                                     Activator.getDefault().logError(e.getMessage());
 331                                 } catch (StateSystemDisposedException e) {
 332                                     /* ignored */
 333                                 }
 334                             }
 335                             if (!execNameInterval.getStateValue().isNull() &&
 336                                     execNameInterval.getStateValue().getType() == ITmfStateValue.Type.STRING) {
 337                                 String execName = execNameInterval.getStateValue().unboxStr();
 338                                 int ppid = ppidInterval.getStateValue().unboxInt();
 339                                 ControlFlowEntry entry = entryMap.get(entryKey);
 340                                 if (entry == null) {
 341                                     entry = new ControlFlowEntry(threadQuark, trace, execName, threadId, ppid, startTime, endTime);
 342                                     entryList.add(entry);
 343                                     entryMap.put(entryKey, entry);
 344                                 } else {
 345                                     /*
 346                                      * Update the name of the entry to the
 347                                      * latest execName and the parent thread id
 348                                      * to the latest ppid.
 349                                      */
 350                                     entry.setName(execName);
 351                                     entry.setParentThreadId(ppid);
 352                                     entry.updateEndTime(endTime);
 353                                 }
 354                             }
 355                             if (isNull) {
 356                                 entryMap.remove(entryKey);
 357                             }
 358                             lastExecNameStartTime = startTime;
 359                             lastExecNameEndTime = endTime;
 360                             lastPpidStartTime = ppidInterval.getStartTime();
 361                         }
 362                     }
 363                     updateTree(entryList, parentTrace, ssq);
 364                 }
 365             });
 366
 367             queryFullStates(ssq, ssq.getStartTime(), end, resolution, monitor, new IQueryHandler() {
 368                 @Override
 369                 public void handle(@NonNull List<List<ITmfStateInterval>> fullStates, @Nullable List<ITmfStateInterval> prevFullState) {
 370                     for (final TimeGraphEntry entry : getEntryList(ssq)) {
 371                         if (monitor.isCanceled()) {
 372                             return;
 373                         }
 374                         buildStatusEvents(trace, parentTrace, ssq, fullStates, prevFullState, (ControlFlowEntry) entry, monitor, ssq.getStartTime(), end);
 375                     }
 376                 }
 377             });
 378
 379             if (parentTrace.equals(getTrace())) {
 380                 refresh();
 381             }
 382
 383             start = end;
 384         }
 385     }
 386
 387     private void updateTree(List<ControlFlowEntry> entryList, ITmfTrace parentTrace, ITmfStateSystem ss) {
 388         List<TimeGraphEntry> rootListToAdd = new ArrayList<>();
 389         List<TimeGraphEntry> rootListToRemove = new ArrayList<>();
 390         List<TimeGraphEntry> rootList = getEntryList(ss);
 391
 392         for (ControlFlowEntry entry : entryList) {
 393             boolean root = (entry.getParent() == null);
 394             if (root && entry.getParentThreadId() > 0) {
 395                 for (ControlFlowEntry parent : entryList) {
 396                     /*
 397                      * Associate the parent entry only if their time overlap. A
 398                      * child entry may start before its parent, for example at
 399                      * the beginning of the trace if a parent has not yet
 400                      * appeared in the state system. We just want to make sure
 401                      * that the entry didn't start after the parent ended or
 402                      * ended before the parent started.
 403                      */
 404                     if (parent.getThreadId() == entry.getParentThreadId() &&
 405                             !(entry.getStartTime() > parent.getEndTime() ||
 406                             entry.getEndTime() < parent.getStartTime())) {
 407                         parent.addChild(entry);
 408                         root = false;
 409                         if (rootList != null && rootList.contains(entry)) {
 410                             rootListToRemove.add(entry);
 411                         }
 412                         break;
 413                     }
 414                 }
 415             }
 416             if (root && (rootList == null || !rootList.contains(entry))) {
 417                 rootListToAdd.add(entry);
 418             }
 419         }
 420
 421         addToEntryList(parentTrace, ss, rootListToAdd);
 422         removeFromEntryList(parentTrace, ss, rootListToRemove);
 423     }
 424
 425     private void buildStatusEvents(ITmfTrace trace, ITmfTrace parentTrace, ITmfStateSystem ss, @NonNull List<List<ITmfStateInterval>> fullStates,
 426             @Nullable List<ITmfStateInterval> prevFullState, ControlFlowEntry entry, @NonNull IProgressMonitor monitor, long start, long end) {
 427         if (start < entry.getEndTime() && end > entry.getStartTime()) {
 428             List<ITimeEvent> eventList = getEventList(entry, ss, fullStates, prevFullState, monitor);
 429             if (eventList == null) {
 430                 return;
 431             }
 432             /* Start a new event list on first iteration, then append to it */
 433             if (prevFullState == null) {
 434                 entry.setEventList(eventList);
 435             } else {
 436                 for (ITimeEvent event : eventList) {
 437                     entry.addEvent(event);
 438                 }
 439             }
 440             if (parentTrace.equals(getTrace())) {
 441                 redraw();
 442             }
 443         }
 444         for (ITimeGraphEntry child : entry.getChildren()) {
 445             if (monitor.isCanceled()) {
 446                 return;
 447             }
 448             buildStatusEvents(trace, parentTrace, ss, fullStates, prevFullState, (ControlFlowEntry) child, monitor, start, end);
 449         }
 450     }
 451
 452     @Override
 453     protected @Nullable List<ITimeEvent> getEventList(@NonNull TimeGraphEntry tgentry, ITmfStateSystem ss,
 454             @NonNull List<List<ITmfStateInterval>> fullStates, @Nullable List<ITmfStateInterval> prevFullState, @NonNull IProgressMonitor monitor) {
 455         List<ITimeEvent> eventList = null;
 456         if (!(tgentry instanceof ControlFlowEntry)) {
 457             return eventList;
 458         }
 459         ControlFlowEntry entry = (ControlFlowEntry) tgentry;
 460         try {
 461             int threadQuark = entry.getThreadQuark();
 462             int statusQuark = ss.getQuarkRelative(threadQuark, Attributes.STATUS);
 463             eventList = new ArrayList<>(fullStates.size());
 464             ITmfStateInterval lastInterval = prevFullState == null || statusQuark >= prevFullState.size() ? null : prevFullState.get(statusQuark);
 465             long lastStartTime = lastInterval == null ? -1 : lastInterval.getStartTime();
 466             long lastEndTime = lastInterval == null ? -1 : lastInterval.getEndTime() + 1;
 467             for (List<ITmfStateInterval> fullState : fullStates) {
 468                 if (monitor.isCanceled()) {
 469                     return null;
 470                 }
 471                 if (statusQuark >= fullState.size()) {
 472                     /* No information on this thread (yet?), skip it for now */
 473                     continue;
 474                 }
 475                 ITmfStateInterval statusInterval = fullState.get(statusQuark);
 476                 long time = statusInterval.getStartTime();
 477                 if (time == lastStartTime) {
 478                     continue;
 479                 }
 480                 long duration = statusInterval.getEndTime() - time + 1;
 481                 int status = -1;
 482                 try {
 483                     status = statusInterval.getStateValue().unboxInt();
 484                 } catch (StateValueTypeException e) {
 485                     Activator.getDefault().logError(e.getMessage());
 486                 }
 487                 if (lastEndTime != time && lastEndTime != -1) {
 488                     eventList.add(new TimeEvent(entry, lastEndTime, time - lastEndTime));
 489                 }
 490                 if (!statusInterval.getStateValue().isNull()) {
 491                     eventList.add(new TimeEvent(entry, time, duration, status));
 492                 } else {
 493                     eventList.add(new NullTimeEvent(entry, time, duration));
 494                 }
 495                 lastStartTime = time;
 496                 lastEndTime = time + duration;
 497             }
 498         } catch (AttributeNotFoundException | TimeRangeException e) {
 499             Activator.getDefault().logError(e.getMessage());
 500         }
 501         return eventList;
 502     }
 503
 504     /**
 505      * Returns a value corresponding to the selected entry.
 506      *
 507      * Used in conjunction with synchingToTime to change the selected entry. If
 508      * one of these methods is overridden in child class, then both should be.
 509      *
 510      * @param time
 511      *            The currently selected time
 512      * @return a value identifying the entry
 513      */
 514     private int getSelectionValue(long time) {
 515         int thread = -1;
 516         for (ITmfTrace trace : TmfTraceManager.getTraceSet(getTrace())) {
 517             if (thread > 0) {
 518                 break;
 519             }
 520             ITmfStateSystem ssq = TmfStateSystemAnalysisModule.getStateSystem(trace, KernelAnalysisModule.ID);
 521             if (ssq == null) {
 522                 continue;
 523             }
 524             if (time >= ssq.getStartTime() && time <= ssq.getCurrentEndTime()) {
 525                 List<Integer> currentThreadQuarks = ssq.getQuarks(Attributes.CPUS, "*", Attributes.CURRENT_THREAD); //$NON-NLS-1$
 526                 for (int currentThreadQuark : currentThreadQuarks) {
 527                     try {
 528                         ITmfStateInterval currentThreadInterval = ssq.querySingleState(time, currentThreadQuark);
 529                         int currentThread = currentThreadInterval.getStateValue().unboxInt();
 530                         if (currentThread > 0) {
 531                             int statusQuark = ssq.getQuarkAbsolute(Attributes.THREADS, Integer.toString(currentThread), Attributes.STATUS);
 532                             ITmfStateInterval statusInterval = ssq.querySingleState(time, statusQuark);
 533                             if (statusInterval.getStartTime() == time) {
 534                                 thread = currentThread;
 535                                 break;
 536                             }
 537                         }
 538                     } catch (AttributeNotFoundException | TimeRangeException | StateValueTypeException e) {
 539                         Activator.getDefault().logError(e.getMessage());
 540                     } catch (StateSystemDisposedException e) {
 541                         /* Ignored */
 542                     }
 543                 }
 544             }
 545         }
 546         return thread;
 547     }
 548
 549     @Override
 550     protected void synchingToTime(long time) {
 551         int selected = getSelectionValue(time);
 552         if (selected > 0) {
 553             for (Object element : getTimeGraphViewer().getExpandedElements()) {
 554                 if (element instanceof ControlFlowEntry) {
 555                     ControlFlowEntry entry = (ControlFlowEntry) element;
 556                     if (entry.getThreadId() == selected) {
 557                         getTimeGraphCombo().setSelection(entry);
 558                         break;
 559                     }
 560                 }
 561             }
 562         }
 563     }
 564
 565     @Override
 566     protected @NonNull List<ILinkEvent> getLinkList(ITmfStateSystem ss,
 567             @NonNull List<List<ITmfStateInterval>> fullStates, @Nullable List<ITmfStateInterval> prevFullState, @NonNull IProgressMonitor monitor) {
 568         List<ILinkEvent> list = new ArrayList<>();
 569         List<TimeGraphEntry> entryList = getEntryList(ss);
 570         if (entryList == null) {
 571             return list;
 572         }
 573         for (ITmfTrace trace : TmfTraceManager.getTraceSet(getTrace())) {
 574             List<Integer> currentThreadQuarks = ss.getQuarks(Attributes.CPUS, "*", Attributes.CURRENT_THREAD); //$NON-NLS-1$
 575             for (int currentThreadQuark : currentThreadQuarks) {
 576                 if (currentThreadQuark >= fullStates.get(0).size()) {
 577                     /* No information on this cpu (yet?), skip it for now */
 578                     continue;
 579                 }
 580                 List<ITmfStateInterval> currentThreadIntervals = new ArrayList<>(fullStates.size() + 2);
 581                 try {
 582                     /*
 583                      * Add the previous interval if it is the first query
 584                      * iteration and the first interval has currentThread=0. Add
 585                      * the following interval if the last interval has
 586                      * currentThread=0. These are diagonal arrows crossing the
 587                      * query iteration range.
 588                      */
 589                     if (prevFullState == null) {
 590                         ITmfStateInterval currentThreadInterval = fullStates.get(0).get(currentThreadQuark);
 591                         if (currentThreadInterval.getStateValue().unboxInt() == 0) {
 592                             long start = Math.max(currentThreadInterval.getStartTime() - 1, ss.getStartTime());
 593                             currentThreadIntervals.add(ss.querySingleState(start, currentThreadQuark));
 594                         }
 595                     }
 596                     for (List<ITmfStateInterval> fullState : fullStates) {
 597                         currentThreadIntervals.add(fullState.get(currentThreadQuark));
 598                     }
 599                     ITmfStateInterval currentThreadInterval = fullStates.get(fullStates.size() - 1).get(currentThreadQuark);
 600                     if (currentThreadInterval.getStateValue().unboxInt() == 0) {
 601                         long end = Math.min(currentThreadInterval.getEndTime() + 1, ss.getCurrentEndTime());
 602                         currentThreadIntervals.add(ss.querySingleState(end, currentThreadQuark));
 603                     }
 604                 } catch (AttributeNotFoundException e) {
 605                     Activator.getDefault().logError(e.getMessage());
 606                     return list;
 607                 } catch (StateSystemDisposedException e) {
 608                     /* Ignored */
 609                     return list;
 610                 }
 611                 int prevThread = 0;
 612                 long prevEnd = 0;
 613                 long lastEnd = 0;
 614                 for (ITmfStateInterval currentThreadInterval : currentThreadIntervals) {
 615                     if (monitor.isCanceled()) {
 616                         return list;
 617                     }
 618                     if (currentThreadInterval.getEndTime() + 1 == lastEnd) {
 619                         continue;
 620                     }
 621                     long time = currentThreadInterval.getStartTime();
 622                     if (time != lastEnd) {
 623                         // don't create links where there are gaps in intervals due to the resolution
 624                         prevThread = 0;
 625                         prevEnd = 0;
 626                     }
 627                     int thread = currentThreadInterval.getStateValue().unboxInt();
 628                     if (thread > 0 && prevThread > 0) {
 629                         ITimeGraphEntry prevEntry = findEntry(entryList, trace, prevThread);
 630                         ITimeGraphEntry nextEntry = findEntry(entryList, trace, thread);
 631                         list.add(new TimeLinkEvent(prevEntry, nextEntry, prevEnd, time - prevEnd, 0));
 632                     }
 633                     lastEnd = currentThreadInterval.getEndTime() + 1;
 634                     if (thread != 0) {
 635                         prevThread = thread;
 636                         prevEnd = lastEnd;
 637                     }
 638                 }
 639             }
 640         }
 641         return list;
 642     }
 643
 644     private ControlFlowEntry findEntry(List<? extends ITimeGraphEntry> entryList, ITmfTrace trace, int threadId) {
 645         for (ITimeGraphEntry entry : entryList) {
 646             if (entry instanceof ControlFlowEntry) {
 647                 ControlFlowEntry controlFlowEntry = (ControlFlowEntry) entry;
 648                 if (controlFlowEntry.getThreadId() == threadId && controlFlowEntry.getTrace() == trace) {
 649                     return controlFlowEntry;
 650                 } else if (entry.hasChildren()) {
 651                     controlFlowEntry = findEntry(entry.getChildren(), trace, threadId);
 652                     if (controlFlowEntry != null) {
 653                         return controlFlowEntry;
 654                     }
 655                 }
 656             }
 657         }
 658         return null;
 659     }
 660 }