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

   1 /*******************************************************************************
   2  * Copyright (c) 2012, 2015 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.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.core.kernel.handlers.KernelEventHandlerUtils;
  36 import org.eclipse.tracecompass.internal.analysis.os.linux.ui.Activator;
  37 import org.eclipse.tracecompass.internal.analysis.os.linux.ui.Messages;
  38 import org.eclipse.tracecompass.internal.analysis.os.linux.ui.actions.FollowThreadAction;
  39 import org.eclipse.tracecompass.internal.analysis.os.linux.ui.views.controlflow.ControlFlowColumnComparators;
  40 import org.eclipse.tracecompass.statesystem.core.ITmfStateSystem;
  41 import org.eclipse.tracecompass.statesystem.core.exceptions.AttributeNotFoundException;
  42 import org.eclipse.tracecompass.statesystem.core.exceptions.StateSystemDisposedException;
  43 import org.eclipse.tracecompass.statesystem.core.exceptions.StateValueTypeException;
  44 import org.eclipse.tracecompass.statesystem.core.exceptions.TimeRangeException;
  45 import org.eclipse.tracecompass.statesystem.core.interval.ITmfStateInterval;
  46 import org.eclipse.tracecompass.statesystem.core.statevalue.ITmfStateValue;
  47 import org.eclipse.tracecompass.tmf.core.statesystem.TmfStateSystemAnalysisModule;
  48 import org.eclipse.tracecompass.tmf.core.trace.ITmfTrace;
  49 import org.eclipse.tracecompass.tmf.core.trace.TmfTraceManager;
  50 import org.eclipse.tracecompass.tmf.core.util.Pair;
  51 import org.eclipse.tracecompass.tmf.ui.views.timegraph.AbstractStateSystemTimeGraphView;
  52 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.ILinkEvent;
  53 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.ITimeEvent;
  54 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.ITimeGraphEntry;
  55 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.NullTimeEvent;
  56 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.TimeEvent;
  57 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.TimeGraphEntry;
  58 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.TimeLinkEvent;
  59 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.widgets.Utils;
  60 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.widgets.Utils.Resolution;
  61 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.widgets.Utils.TimeFormat;
  62
  63 import com.google.common.collect.ImmutableList;
  64
  65 /**
  66  * The Control Flow view main object
  67  *
  68  */
  69 public class ControlFlowView extends AbstractStateSystemTimeGraphView {
  70
  71     // ------------------------------------------------------------------------
  72     // Constants
  73     // ------------------------------------------------------------------------
  74     /**
  75      * View ID.
  76      */
  77     public static final String ID = "org.eclipse.tracecompass.analysis.os.linux.views.controlflow"; //$NON-NLS-1$
  78
  79     private static final String PROCESS_COLUMN = Messages.ControlFlowView_processColumn;
  80     private static final String TID_COLUMN = Messages.ControlFlowView_tidColumn;
  81     private static final String PTID_COLUMN = Messages.ControlFlowView_ptidColumn;
  82     private static final String BIRTH_TIME_COLUMN = Messages.ControlFlowView_birthTimeColumn;
  83     private static final String TRACE_COLUMN = Messages.ControlFlowView_traceColumn;
  84
  85     private static final String[] COLUMN_NAMES = new String[] {
  86             PROCESS_COLUMN,
  87             TID_COLUMN,
  88             PTID_COLUMN,
  89             BIRTH_TIME_COLUMN,
  90             TRACE_COLUMN
  91     };
  92
  93     private static final String[] FILTER_COLUMN_NAMES = new String[] {
  94             PROCESS_COLUMN,
  95             TID_COLUMN
  96     };
  97
  98     // Timeout between updates in the build thread in ms
  99     private static final long BUILD_UPDATE_TIMEOUT = 500;
 100
 101     private static final Comparator<ITimeGraphEntry>[] COLUMN_COMPARATORS;
 102
 103     private static final int INITIAL_SORT_COLUMN_INDEX = 3;
 104
 105     static {
 106         ImmutableList.Builder<Comparator<ITimeGraphEntry>> builder = ImmutableList.builder();
 107         builder.add(ControlFlowColumnComparators.PROCESS_NAME_COLUMN_COMPARATOR)
 108             .add(ControlFlowColumnComparators.TID_COLUMN_COMPARATOR)
 109             .add(ControlFlowColumnComparators.PTID_COLUMN_COMPARATOR)
 110             .add(ControlFlowColumnComparators.BIRTH_TIME_COLUMN_COMPARATOR)
 111             .add(ControlFlowColumnComparators.TRACE_COLUMN_COMPARATOR);
 112         List<Comparator<ITimeGraphEntry>> l = builder.build();
 113         COLUMN_COMPARATORS = l.toArray(new Comparator[l.size()]);
 114     }
 115
 116     // ------------------------------------------------------------------------
 117     // Constructors
 118     // ------------------------------------------------------------------------
 119
 120     /**
 121      * Constructor
 122      */
 123     public ControlFlowView() {
 124         super(ID, new ControlFlowPresentationProvider());
 125         setTreeColumns(COLUMN_NAMES, COLUMN_COMPARATORS, INITIAL_SORT_COLUMN_INDEX);
 126         setTreeLabelProvider(new ControlFlowTreeLabelProvider());
 127         setFilterColumns(FILTER_COLUMN_NAMES);
 128         setFilterLabelProvider(new ControlFlowFilterLabelProvider());
 129         setEntryComparator(ControlFlowColumnComparators.BIRTH_TIME_COLUMN_COMPARATOR);
 130     }
 131
 132     @Override
 133     public void createPartControl(Composite parent) {
 134         super.createPartControl(parent);
 135         // add "Check active" Button to TimeGraphFilterDialog
 136         super.getTimeGraphCombo().addTimeGraphFilterCheckActiveButton(
 137                 new ControlFlowCheckActiveProvider(Messages.ControlFlowView_checkActiveLabel, Messages.ControlFlowView_checkActiveToolTip));
 138         // add "Uncheck inactive" Button to TimeGraphFilterDialog
 139         super.getTimeGraphCombo().addTimeGraphFilterUncheckInactiveButton(
 140                 new ControlFlowCheckActiveProvider(Messages.ControlFlowView_uncheckInactiveLabel, Messages.ControlFlowView_uncheckInactiveToolTip));
 141     }
 142
 143     /**
 144      * @since 2.0
 145      */
 146     @Override
 147     protected void fillTimeGraphEntryContextMenu(@NonNull IMenuManager menuManager) {
 148         ISelection selection = getSite().getSelectionProvider().getSelection();
 149         if (selection instanceof StructuredSelection) {
 150             StructuredSelection sSel = (StructuredSelection) selection;
 151             if (sSel.getFirstElement() instanceof ControlFlowEntry) {
 152                 ControlFlowEntry entry = (ControlFlowEntry) sSel.getFirstElement();
 153                 menuManager.add(new FollowThreadAction(ControlFlowView.this, entry.getName(), entry.getThreadId(), entry.getTrace()));
 154             }
 155         }
 156     }
 157
 158     @Override
 159     protected void fillLocalToolBar(IToolBarManager manager) {
 160         super.fillLocalToolBar(manager);
 161         IDialogSettings settings = Activator.getDefault().getDialogSettings();
 162         IDialogSettings section = settings.getSection(getClass().getName());
 163         if (section == null) {
 164             section = settings.addNewSection(getClass().getName());
 165         }
 166
 167         IAction hideArrowsAction = getTimeGraphCombo().getTimeGraphViewer().getHideArrowsAction(section);
 168         manager.add(hideArrowsAction);
 169
 170         IAction followArrowBwdAction = getTimeGraphCombo().getTimeGraphViewer().getFollowArrowBwdAction();
 171         followArrowBwdAction.setText(Messages.ControlFlowView_followCPUBwdText);
 172         followArrowBwdAction.setToolTipText(Messages.ControlFlowView_followCPUBwdText);
 173         manager.add(followArrowBwdAction);
 174
 175         IAction followArrowFwdAction = getTimeGraphCombo().getTimeGraphViewer().getFollowArrowFwdAction();
 176         followArrowFwdAction.setText(Messages.ControlFlowView_followCPUFwdText);
 177         followArrowFwdAction.setToolTipText(Messages.ControlFlowView_followCPUFwdText);
 178         manager.add(followArrowFwdAction);
 179     }
 180
 181     @Override
 182     protected String getNextText() {
 183         return Messages.ControlFlowView_nextProcessActionNameText;
 184     }
 185
 186     @Override
 187     protected String getNextTooltip() {
 188         return Messages.ControlFlowView_nextProcessActionToolTipText;
 189     }
 190
 191     @Override
 192     protected String getPrevText() {
 193         return Messages.ControlFlowView_previousProcessActionNameText;
 194     }
 195
 196     @Override
 197     protected String getPrevTooltip() {
 198         return Messages.ControlFlowView_previousProcessActionToolTipText;
 199     }
 200
 201     /**
 202      * @author gbastien
 203      *
 204      */
 205     protected static class ControlFlowTreeLabelProvider extends TreeLabelProvider {
 206
 207         @Override
 208         public String getColumnText(Object element, int columnIndex) {
 209             ControlFlowEntry entry = (ControlFlowEntry) element;
 210
 211             if (COLUMN_NAMES[columnIndex].equals(Messages.ControlFlowView_processColumn)) {
 212                 return entry.getName();
 213             } else if (COLUMN_NAMES[columnIndex].equals(Messages.ControlFlowView_tidColumn)) {
 214                 return Integer.toString(entry.getThreadId());
 215             } else if (COLUMN_NAMES[columnIndex].equals(Messages.ControlFlowView_ptidColumn)) {
 216                 if (entry.getParentThreadId() > 0) {
 217                     return Integer.toString(entry.getParentThreadId());
 218                 }
 219             } else if (COLUMN_NAMES[columnIndex].equals(Messages.ControlFlowView_birthTimeColumn)) {
 220                 return Utils.formatTime(entry.getStartTime(), TimeFormat.CALENDAR, Resolution.NANOSEC);
 221             } else if (COLUMN_NAMES[columnIndex].equals(Messages.ControlFlowView_traceColumn)) {
 222                 return entry.getTrace().getName();
 223             }
 224             return ""; //$NON-NLS-1$
 225         }
 226
 227     }
 228
 229     private static class ControlFlowFilterLabelProvider extends TreeLabelProvider {
 230
 231         @Override
 232         public String getColumnText(Object element, int columnIndex) {
 233             ControlFlowEntry entry = (ControlFlowEntry) element;
 234
 235             if (columnIndex == 0) {
 236                 return entry.getName();
 237             } else if (columnIndex == 1) {
 238                 return Integer.toString(entry.getThreadId());
 239             }
 240             return ""; //$NON-NLS-1$
 241         }
 242
 243     }
 244
 245     // ------------------------------------------------------------------------
 246     // Internal
 247     // ------------------------------------------------------------------------
 248
 249     @Override
 250     protected void buildEventList(final ITmfTrace trace, final ITmfTrace parentTrace, final IProgressMonitor monitor) {
 251         final ITmfStateSystem ssq = TmfStateSystemAnalysisModule.getStateSystem(trace, KernelAnalysisModule.ID);
 252         if (ssq == null) {
 253             return;
 254         }
 255
 256         final List<ControlFlowEntry> entryList = new ArrayList<>();
 257         /** Map of view entries, key is a pair [threadId, cpuId] */
 258         final Map<Pair<Integer, Integer>, ControlFlowEntry> entryMap = new HashMap<>();
 259
 260         long start = ssq.getStartTime();
 261         setStartTime(Math.min(getStartTime(), start));
 262
 263         boolean complete = false;
 264         while (!complete) {
 265             if (monitor.isCanceled()) {
 266                 return;
 267             }
 268             complete = ssq.waitUntilBuilt(BUILD_UPDATE_TIMEOUT);
 269             if (ssq.isCancelled()) {
 270                 return;
 271             }
 272             long end = ssq.getCurrentEndTime();
 273             if (start == end && !complete) { // when complete execute one last time regardless of end time
 274                 continue;
 275             }
 276             final long resolution = Math.max(1, (end - ssq.getStartTime()) / getDisplayWidth());
 277             setEndTime(Math.max(getEndTime(), end + 1));
 278             final List<Integer> threadQuarks = ssq.getQuarks(Attributes.THREADS, "*"); //$NON-NLS-1$
 279             final long qStart = start;
 280             final long qEnd = end;
 281             queryFullStates(ssq, qStart, qEnd, resolution, monitor, new IQueryHandler() {
 282                 @Override
 283                 public void handle(List<List<ITmfStateInterval>> fullStates, List<ITmfStateInterval> prevFullState) {
 284                     for (int threadQuark : threadQuarks) {
 285                         String threadAttributeName = ssq.getAttributeName(threadQuark);
 286
 287                         Pair<Integer, Integer> entryKey = KernelEventHandlerUtils.parseThreadAttributeName(threadAttributeName);
 288                         int threadId = entryKey.getFirst();
 289
 290                         if (threadId < 0) { // ignore the 'unknown' (-1) thread
 291                             continue;
 292                         }
 293
 294                         int execNameQuark;
 295                         int ppidQuark;
 296                         try {
 297                             execNameQuark = ssq.getQuarkRelative(threadQuark, Attributes.EXEC_NAME);
 298                             ppidQuark = ssq.getQuarkRelative(threadQuark, Attributes.PPID);
 299                         } catch (AttributeNotFoundException e) {
 300                             /* No information on this thread (yet?), skip it for now */
 301                             continue;
 302                         }
 303                         ITmfStateInterval lastExecNameInterval = prevFullState == null || execNameQuark >= prevFullState.size() ? null : prevFullState.get(execNameQuark);
 304                         long lastExecNameStartTime = lastExecNameInterval == null ? -1 : lastExecNameInterval.getStartTime();
 305                         long lastExecNameEndTime = lastExecNameInterval == null ? -1 : lastExecNameInterval.getEndTime() + 1;
 306                         long lastPpidStartTime = prevFullState == null || ppidQuark >= prevFullState.size() ? -1 : prevFullState.get(ppidQuark).getStartTime();
 307                         for (List<ITmfStateInterval> fullState : fullStates) {
 308                             if (monitor.isCanceled()) {
 309                                 return;
 310                             }
 311                             if (execNameQuark >= fullState.size() || ppidQuark >= fullState.size()) {
 312                                 /* No information on this thread (yet?), skip it for now */
 313                                 continue;
 314                             }
 315                             ITmfStateInterval execNameInterval = fullState.get(execNameQuark);
 316                             ITmfStateInterval ppidInterval = fullState.get(ppidQuark);
 317                             long startTime = execNameInterval.getStartTime();
 318                             long endTime = execNameInterval.getEndTime() + 1;
 319                             if (startTime == lastExecNameStartTime && ppidInterval.getStartTime() == lastPpidStartTime) {
 320                                 continue;
 321                             }
 322                             boolean isNull = execNameInterval.getStateValue().isNull();
 323                             if (isNull && lastExecNameEndTime < startTime && lastExecNameEndTime != -1) {
 324                                 /*
 325                                  * There was a non-null interval in between the
 326                                  * full states, try to use it.
 327                                  */
 328                                 try {
 329                                     execNameInterval = ssq.querySingleState(startTime - 1, execNameQuark);
 330                                     ppidInterval = ssq.querySingleState(startTime - 1, ppidQuark);
 331                                     startTime = execNameInterval.getStartTime();
 332                                     endTime = execNameInterval.getEndTime() + 1;
 333                                 } catch (AttributeNotFoundException e) {
 334                                     Activator.getDefault().logError(e.getMessage());
 335                                 } catch (StateSystemDisposedException e) {
 336                                     /* ignored */
 337                                 }
 338                             }
 339                             if (!execNameInterval.getStateValue().isNull() &&
 340                                     execNameInterval.getStateValue().getType() == ITmfStateValue.Type.STRING) {
 341                                 String execName = execNameInterval.getStateValue().unboxStr();
 342                                 int ppid = ppidInterval.getStateValue().unboxInt();
 343                                 ControlFlowEntry entry = entryMap.get(entryKey);
 344                                 if (entry == null) {
 345                                     entry = new ControlFlowEntry(threadQuark, trace, execName, threadId, ppid, startTime, endTime);
 346                                     entryList.add(entry);
 347                                     entryMap.put(entryKey, entry);
 348                                 } else {
 349                                     /*
 350                                      * Update the name of the entry to the
 351                                      * latest execName and the parent thread id
 352                                      * to the latest ppid.
 353                                      */
 354                                     entry.setName(execName);
 355                                     entry.setParentThreadId(ppid);
 356                                     entry.updateEndTime(endTime);
 357                                 }
 358                             }
 359                             if (isNull) {
 360                                 entryMap.remove(entryKey);
 361                             }
 362                             lastExecNameStartTime = startTime;
 363                             lastExecNameEndTime = endTime;
 364                             lastPpidStartTime = ppidInterval.getStartTime();
 365                         }
 366                     }
 367                     updateTree(entryList, parentTrace, ssq);
 368
 369                     for (final TimeGraphEntry entry : getEntryList(ssq)) {
 370                         if (monitor.isCanceled()) {
 371                             return;
 372                         }
 373                         buildStatusEvents(trace, parentTrace, ssq, fullStates, prevFullState, (ControlFlowEntry) entry, monitor, qStart, qEnd);
 374                     }
 375                 }
 376             });
 377
 378             if (parentTrace.equals(getTrace())) {
 379                 refresh();
 380             }
 381
 382             start = end;
 383         }
 384     }
 385
 386     private void updateTree(List<ControlFlowEntry> entryList, ITmfTrace parentTrace, ITmfStateSystem ss) {
 387         List<TimeGraphEntry> rootListToAdd = new ArrayList<>();
 388         List<TimeGraphEntry> rootListToRemove = new ArrayList<>();
 389         List<TimeGraphEntry> rootList = getEntryList(ss);
 390
 391         for (ControlFlowEntry entry : entryList) {
 392             boolean root = (entry.getParent() == null);
 393             if (root && entry.getParentThreadId() > 0) {
 394                 for (ControlFlowEntry parent : entryList) {
 395                     /*
 396                      * Associate the parent entry only if their time overlap. A
 397                      * child entry may start before its parent, for example at
 398                      * the beginning of the trace if a parent has not yet
 399                      * appeared in the state system. We just want to make sure
 400                      * that the entry didn't start after the parent ended or
 401                      * ended before the parent started.
 402                      */
 403                     if (parent.getThreadId() == entry.getParentThreadId() &&
 404                             !(entry.getStartTime() > parent.getEndTime() ||
 405                             entry.getEndTime() < parent.getStartTime())) {
 406                         parent.addChild(entry);
 407                         root = false;
 408                         if (rootList != null && rootList.contains(entry)) {
 409                             rootListToRemove.add(entry);
 410                         }
 411                         break;
 412                     }
 413                 }
 414             }
 415             if (root && (rootList == null || !rootList.contains(entry))) {
 416                 rootListToAdd.add(entry);
 417             }
 418         }
 419
 420         addToEntryList(parentTrace, ss, rootListToAdd);
 421         removeFromEntryList(parentTrace, ss, rootListToRemove);
 422     }
 423
 424     private void buildStatusEvents(ITmfTrace trace, ITmfTrace parentTrace, ITmfStateSystem ss, @NonNull List<List<ITmfStateInterval>> fullStates,
 425             @Nullable List<ITmfStateInterval> prevFullState, ControlFlowEntry entry, @NonNull IProgressMonitor monitor, long start, long end) {
 426         if (start < entry.getEndTime() && end > entry.getStartTime()) {
 427             List<ITimeEvent> eventList = getEventList(entry, ss, fullStates, prevFullState, monitor);
 428             if (eventList == null) {
 429                 return;
 430             }
 431             for (ITimeEvent event : eventList) {
 432                 entry.addEvent(event);
 433             }
 434             if (parentTrace.equals(getTrace())) {
 435                 redraw();
 436             }
 437         }
 438         for (ITimeGraphEntry child : entry.getChildren()) {
 439             if (monitor.isCanceled()) {
 440                 return;
 441             }
 442             buildStatusEvents(trace, parentTrace, ss, fullStates, prevFullState, (ControlFlowEntry) child, monitor, start, end);
 443         }
 444     }
 445
 446     @Override
 447     protected @Nullable List<ITimeEvent> getEventList(@NonNull TimeGraphEntry tgentry, ITmfStateSystem ss,
 448             @NonNull List<List<ITmfStateInterval>> fullStates, @Nullable List<ITmfStateInterval> prevFullState, @NonNull IProgressMonitor monitor) {
 449         List<ITimeEvent> eventList = null;
 450         if (!(tgentry instanceof ControlFlowEntry)) {
 451             return eventList;
 452         }
 453         ControlFlowEntry entry = (ControlFlowEntry) tgentry;
 454         try {
 455             int threadQuark = entry.getThreadQuark();
 456             int statusQuark = ss.getQuarkRelative(threadQuark, Attributes.STATUS);
 457             eventList = new ArrayList<>(fullStates.size());
 458             ITmfStateInterval lastInterval = prevFullState == null || statusQuark >= prevFullState.size() ? null : prevFullState.get(statusQuark);
 459             long lastStartTime = lastInterval == null ? -1 : lastInterval.getStartTime();
 460             long lastEndTime = lastInterval == null ? -1 : lastInterval.getEndTime() + 1;
 461             for (List<ITmfStateInterval> fullState : fullStates) {
 462                 if (monitor.isCanceled()) {
 463                     return null;
 464                 }
 465                 if (statusQuark >= fullState.size()) {
 466                     /* No information on this thread (yet?), skip it for now */
 467                     continue;
 468                 }
 469                 ITmfStateInterval statusInterval = fullState.get(statusQuark);
 470                 long time = statusInterval.getStartTime();
 471                 if (time == lastStartTime) {
 472                     continue;
 473                 }
 474                 long duration = statusInterval.getEndTime() - time + 1;
 475                 int status = -1;
 476                 try {
 477                     status = statusInterval.getStateValue().unboxInt();
 478                 } catch (StateValueTypeException e) {
 479                     Activator.getDefault().logError(e.getMessage());
 480                 }
 481                 if (lastEndTime != time && lastEndTime != -1) {
 482                     eventList.add(new TimeEvent(entry, lastEndTime, time - lastEndTime));
 483                 }
 484                 if (!statusInterval.getStateValue().isNull()) {
 485                     eventList.add(new TimeEvent(entry, time, duration, status));
 486                 } else {
 487                     eventList.add(new NullTimeEvent(entry, time, duration));
 488                 }
 489                 lastStartTime = time;
 490                 lastEndTime = time + duration;
 491             }
 492         } catch (AttributeNotFoundException | TimeRangeException e) {
 493             Activator.getDefault().logError(e.getMessage());
 494         }
 495         return eventList;
 496     }
 497
 498     /**
 499      * Returns a value corresponding to the selected entry.
 500      *
 501      * Used in conjunction with synchingToTime to change the selected entry. If
 502      * one of these methods is overridden in child class, then both should be.
 503      *
 504      * @param time
 505      *            The currently selected time
 506      * @return a value identifying the entry
 507      */
 508     private int getSelectionValue(long time) {
 509         int thread = -1;
 510         for (ITmfTrace trace : TmfTraceManager.getTraceSet(getTrace())) {
 511             if (thread > 0) {
 512                 break;
 513             }
 514             ITmfStateSystem ssq = TmfStateSystemAnalysisModule.getStateSystem(trace, KernelAnalysisModule.ID);
 515             if (ssq == null) {
 516                 continue;
 517             }
 518             if (time >= ssq.getStartTime() && time <= ssq.getCurrentEndTime()) {
 519                 List<Integer> currentThreadQuarks = ssq.getQuarks(Attributes.CPUS, "*", Attributes.CURRENT_THREAD); //$NON-NLS-1$
 520                 for (int currentThreadQuark : currentThreadQuarks) {
 521                     try {
 522                         ITmfStateInterval currentThreadInterval = ssq.querySingleState(time, currentThreadQuark);
 523                         int currentThread = currentThreadInterval.getStateValue().unboxInt();
 524                         if (currentThread > 0) {
 525                             int statusQuark = ssq.getQuarkAbsolute(Attributes.THREADS, Integer.toString(currentThread), Attributes.STATUS);
 526                             ITmfStateInterval statusInterval = ssq.querySingleState(time, statusQuark);
 527                             if (statusInterval.getStartTime() == time) {
 528                                 thread = currentThread;
 529                                 break;
 530                             }
 531                         }
 532                     } catch (AttributeNotFoundException | TimeRangeException | StateValueTypeException e) {
 533                         Activator.getDefault().logError(e.getMessage());
 534                     } catch (StateSystemDisposedException e) {
 535                         /* Ignored */
 536                     }
 537                 }
 538             }
 539         }
 540         return thread;
 541     }
 542
 543     @Override
 544     protected void synchingToTime(long time) {
 545         int selected = getSelectionValue(time);
 546         if (selected > 0) {
 547             for (Object element : getTimeGraphViewer().getExpandedElements()) {
 548                 if (element instanceof ControlFlowEntry) {
 549                     ControlFlowEntry entry = (ControlFlowEntry) element;
 550                     if (entry.getThreadId() == selected) {
 551                         getTimeGraphCombo().setSelection(entry);
 552                         break;
 553                     }
 554                 }
 555             }
 556         }
 557     }
 558
 559     @Override
 560     protected @NonNull List<ILinkEvent> getLinkList(ITmfStateSystem ss,
 561             @NonNull List<List<ITmfStateInterval>> fullStates, @Nullable List<ITmfStateInterval> prevFullState, @NonNull IProgressMonitor monitor) {
 562         List<ILinkEvent> list = new ArrayList<>();
 563         List<TimeGraphEntry> entryList = getEntryList(ss);
 564         if (entryList == null) {
 565             return list;
 566         }
 567         for (ITmfTrace trace : TmfTraceManager.getTraceSet(getTrace())) {
 568             List<Integer> currentThreadQuarks = ss.getQuarks(Attributes.CPUS, "*", Attributes.CURRENT_THREAD); //$NON-NLS-1$
 569             for (int currentThreadQuark : currentThreadQuarks) {
 570                 if (currentThreadQuark >= fullStates.get(0).size()) {
 571                     /* No information on this cpu (yet?), skip it for now */
 572                     continue;
 573                 }
 574                 List<ITmfStateInterval> currentThreadIntervals = new ArrayList<>(fullStates.size() + 2);
 575                 try {
 576                     /*
 577                      * Add the previous interval if it is the first query
 578                      * iteration and the first interval has currentThread=0. Add
 579                      * the following interval if the last interval has
 580                      * currentThread=0. These are diagonal arrows crossing the
 581                      * query iteration range.
 582                      */
 583                     if (prevFullState == null) {
 584                         ITmfStateInterval currentThreadInterval = fullStates.get(0).get(currentThreadQuark);
 585                         if (currentThreadInterval.getStateValue().unboxInt() == 0) {
 586                             long start = Math.max(currentThreadInterval.getStartTime() - 1, ss.getStartTime());
 587                             currentThreadIntervals.add(ss.querySingleState(start, currentThreadQuark));
 588                         }
 589                     }
 590                     for (List<ITmfStateInterval> fullState : fullStates) {
 591                         currentThreadIntervals.add(fullState.get(currentThreadQuark));
 592                     }
 593                     ITmfStateInterval currentThreadInterval = fullStates.get(fullStates.size() - 1).get(currentThreadQuark);
 594                     if (currentThreadInterval.getStateValue().unboxInt() == 0) {
 595                         long end = Math.min(currentThreadInterval.getEndTime() + 1, ss.getCurrentEndTime());
 596                         currentThreadIntervals.add(ss.querySingleState(end, currentThreadQuark));
 597                     }
 598                 } catch (AttributeNotFoundException e) {
 599                     Activator.getDefault().logError(e.getMessage());
 600                     return list;
 601                 } catch (StateSystemDisposedException e) {
 602                     /* Ignored */
 603                     return list;
 604                 }
 605                 int prevThread = 0;
 606                 long prevEnd = 0;
 607                 long lastEnd = 0;
 608                 for (ITmfStateInterval currentThreadInterval : currentThreadIntervals) {
 609                     if (monitor.isCanceled()) {
 610                         return list;
 611                     }
 612                     if (currentThreadInterval.getEndTime() + 1 == lastEnd) {
 613                         continue;
 614                     }
 615                     long time = currentThreadInterval.getStartTime();
 616                     if (time != lastEnd) {
 617                         // don't create links where there are gaps in intervals due to the resolution
 618                         prevThread = 0;
 619                         prevEnd = 0;
 620                     }
 621                     int thread = currentThreadInterval.getStateValue().unboxInt();
 622                     if (thread > 0 && prevThread > 0) {
 623                         ITimeGraphEntry prevEntry = findEntry(entryList, trace, prevThread);
 624                         ITimeGraphEntry nextEntry = findEntry(entryList, trace, thread);
 625                         list.add(new TimeLinkEvent(prevEntry, nextEntry, prevEnd, time - prevEnd, 0));
 626                     }
 627                     lastEnd = currentThreadInterval.getEndTime() + 1;
 628                     if (thread != 0) {
 629                         prevThread = thread;
 630                         prevEnd = lastEnd;
 631                     }
 632                 }
 633             }
 634         }
 635         return list;
 636     }
 637
 638     private ControlFlowEntry findEntry(List<? extends ITimeGraphEntry> entryList, ITmfTrace trace, int threadId) {
 639         for (ITimeGraphEntry entry : entryList) {
 640             if (entry instanceof ControlFlowEntry) {
 641                 ControlFlowEntry controlFlowEntry = (ControlFlowEntry) entry;
 642                 if (controlFlowEntry.getThreadId() == threadId && controlFlowEntry.getTrace() == trace) {
 643                     return controlFlowEntry;
 644                 } else if (entry.hasChildren()) {
 645                     controlFlowEntry = findEntry(entry.getChildren(), trace, threadId);
 646                     if (controlFlowEntry != null) {
 647                         return controlFlowEntry;
 648                     }
 649                 }
 650             }
 651         }
 652         return null;
 653     }
 654 }