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  *   Mahdi Zolnouri & Samuel Gagnon - Add flat / hierarchical button
  14  *******************************************************************************/
  15
  16 package org.eclipse.tracecompass.internal.analysis.os.linux.ui.views.controlflow;
  17
  18 import java.util.ArrayList;
  19 import java.util.Collection;
  20 import java.util.Collections;
  21 import java.util.Comparator;
  22 import java.util.HashMap;
  23 import java.util.HashSet;
  24 import java.util.List;
  25 import java.util.Map;
  26 import java.util.Set;
  27 import java.util.function.Function;
  28 import java.util.function.Predicate;
  29 import java.util.stream.Collectors;
  30 import java.util.stream.Stream;
  31
  32 import org.eclipse.core.runtime.IProgressMonitor;
  33 import org.eclipse.core.runtime.IStatus;
  34 import org.eclipse.core.runtime.Status;
  35 import org.eclipse.core.runtime.jobs.ISchedulingRule;
  36 import org.eclipse.core.runtime.jobs.Job;
  37 import org.eclipse.jdt.annotation.NonNull;
  38 import org.eclipse.jdt.annotation.Nullable;
  39 import org.eclipse.jface.action.Action;
  40 import org.eclipse.jface.action.IAction;
  41 import org.eclipse.jface.action.IMenuManager;
  42 import org.eclipse.jface.action.IToolBarManager;
  43 import org.eclipse.jface.action.MenuManager;
  44 import org.eclipse.jface.action.Separator;
  45 import org.eclipse.jface.dialogs.IDialogSettings;
  46 import org.eclipse.jface.viewers.ISelection;
  47 import org.eclipse.jface.viewers.StructuredSelection;
  48 import org.eclipse.swt.widgets.Composite;
  49 import org.eclipse.swt.widgets.Event;
  50 import org.eclipse.tracecompass.analysis.os.linux.core.kernel.KernelAnalysisModule;
  51 import org.eclipse.tracecompass.analysis.os.linux.core.kernel.KernelTidAspect;
  52 import org.eclipse.tracecompass.common.core.StreamUtils.StreamFlattener;
  53 import org.eclipse.tracecompass.internal.analysis.os.linux.core.kernel.Attributes;
  54 import org.eclipse.tracecompass.internal.analysis.os.linux.ui.Activator;
  55 import org.eclipse.tracecompass.internal.analysis.os.linux.ui.Messages;
  56 import org.eclipse.tracecompass.internal.analysis.os.linux.ui.actions.FollowThreadAction;
  57 import org.eclipse.tracecompass.statesystem.core.ITmfStateSystem;
  58 import org.eclipse.tracecompass.statesystem.core.exceptions.AttributeNotFoundException;
  59 import org.eclipse.tracecompass.statesystem.core.exceptions.StateSystemDisposedException;
  60 import org.eclipse.tracecompass.statesystem.core.exceptions.StateValueTypeException;
  61 import org.eclipse.tracecompass.statesystem.core.exceptions.TimeRangeException;
  62 import org.eclipse.tracecompass.statesystem.core.interval.ITmfStateInterval;
  63 import org.eclipse.tracecompass.statesystem.core.statevalue.ITmfStateValue;
  64 import org.eclipse.tracecompass.tmf.core.event.ITmfEvent;
  65 import org.eclipse.tracecompass.tmf.core.signal.TmfSelectionRangeUpdatedSignal;
  66 import org.eclipse.tracecompass.tmf.core.signal.TmfSignalHandler;
  67 import org.eclipse.tracecompass.tmf.core.signal.TmfSignalManager;
  68 import org.eclipse.tracecompass.tmf.core.signal.TmfTraceSelectedSignal;
  69 import org.eclipse.tracecompass.tmf.core.statesystem.TmfStateSystemAnalysisModule;
  70 import org.eclipse.tracecompass.tmf.core.timestamp.TmfTimestamp;
  71 import org.eclipse.tracecompass.tmf.core.trace.ITmfContext;
  72 import org.eclipse.tracecompass.tmf.core.trace.ITmfTrace;
  73 import org.eclipse.tracecompass.tmf.core.trace.TmfTraceManager;
  74 import org.eclipse.tracecompass.tmf.core.trace.TmfTraceUtils;
  75 import org.eclipse.tracecompass.tmf.core.util.Pair;
  76 import org.eclipse.tracecompass.tmf.ui.views.timegraph.AbstractStateSystemTimeGraphView;
  77 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.ILinkEvent;
  78 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.ITimeEvent;
  79 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.ITimeGraphEntry;
  80 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.NullTimeEvent;
  81 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.TimeEvent;
  82 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.TimeGraphEntry;
  83 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.model.TimeLinkEvent;
  84 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.widgets.TimeGraphControl;
  85 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.widgets.Utils;
  86 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.widgets.Utils.Resolution;
  87 import org.eclipse.tracecompass.tmf.ui.widgets.timegraph.widgets.Utils.TimeFormat;
  88
  89 import com.google.common.collect.ImmutableList;
  90
  91 /**
  92  * The Control Flow view main object
  93  *
  94  */
  95 public class ControlFlowView extends AbstractStateSystemTimeGraphView {
  96
  97     // ------------------------------------------------------------------------
  98     // Constants
  99     // ------------------------------------------------------------------------
 100     /**
 101      * View ID.
 102      */
 103     public static final @NonNull String ID = "org.eclipse.tracecompass.analysis.os.linux.views.controlflow"; //$NON-NLS-1$
 104
 105     private static final String ICONS_PATH = "icons/"; //$NON-NLS-1$
 106     private static final String OPTIMIZE_ICON = ICONS_PATH + "elcl16/Optimization.png"; //$NON-NLS-1$
 107
 108     private static final String PROCESS_COLUMN = Messages.ControlFlowView_processColumn;
 109     private static final String TID_COLUMN = Messages.ControlFlowView_tidColumn;
 110     private static final String PTID_COLUMN = Messages.ControlFlowView_ptidColumn;
 111     private static final String BIRTH_TIME_COLUMN = Messages.ControlFlowView_birthTimeColumn;
 112     private static final String INVISIBLE_COLUMN = Messages.ControlFlowView_invisibleColumn;
 113     private Action fOptimizationAction;
 114
 115     private static final String NEXT_EVENT_ICON_PATH = "icons/elcl16/shift_r_edit.gif"; //$NON-NLS-1$
 116     private static final String PREV_EVENT_ICON_PATH = "icons/elcl16/shift_l_edit.gif"; //$NON-NLS-1$
 117
 118     private static final String[] COLUMN_NAMES = new String[] {
 119             PROCESS_COLUMN,
 120             TID_COLUMN,
 121             PTID_COLUMN,
 122             BIRTH_TIME_COLUMN
 123     };
 124
 125     private static final String[] FILTER_COLUMN_NAMES = new String[] {
 126             PROCESS_COLUMN,
 127             TID_COLUMN
 128     };
 129
 130     // Timeout between updates in the build thread in ms
 131     private static final long BUILD_UPDATE_TIMEOUT = 500;
 132
 133     private static final Comparator<ITimeGraphEntry>[] COLUMN_COMPARATORS;
 134
 135     private final Function<Collection<ILinkEvent>, Map<Integer, Long>> UPDATE_SCHEDULING_COLUMN_ALGO = new NaiveOptimizationAlgorithm();
 136
 137     private static final int INITIAL_SORT_COLUMN_INDEX = 3;
 138
 139     static {
 140         ImmutableList.Builder<Comparator<ITimeGraphEntry>> builder = ImmutableList.builder();
 141         builder.add(ControlFlowColumnComparators.PROCESS_NAME_COLUMN_COMPARATOR)
 142             .add(ControlFlowColumnComparators.TID_COLUMN_COMPARATOR)
 143             .add(ControlFlowColumnComparators.PTID_COLUMN_COMPARATOR)
 144             .add(ControlFlowColumnComparators.BIRTH_TIME_COLUMN_COMPARATOR);
 145         List<Comparator<ITimeGraphEntry>> l = builder.build();
 146         COLUMN_COMPARATORS = l.toArray(new Comparator[l.size()]);
 147     }
 148
 149     /**
 150      * Mutex rule for search action jobs, making sure they execute sequentially
 151      */
 152     private final ISchedulingRule fSearchActionMutexRule = new ISchedulingRule() {
 153         @Override
 154         public boolean isConflicting(ISchedulingRule rule) {
 155             return (rule == this);
 156         }
 157
 158         @Override
 159         public boolean contains(ISchedulingRule rule) {
 160             return (rule == this);
 161         }
 162     };
 163
 164     private final Set<ITmfTrace> fFlatTraces = new HashSet<>();
 165
 166     private IAction fFlatAction;
 167
 168     private IAction fHierarchicalAction;
 169
 170     // ------------------------------------------------------------------------
 171     // Constructors
 172     // ------------------------------------------------------------------------
 173
 174     /**
 175      * Constructor
 176      */
 177     public ControlFlowView() {
 178         super(ID, new ControlFlowPresentationProvider());
 179         setTreeColumns(COLUMN_NAMES, COLUMN_COMPARATORS, INITIAL_SORT_COLUMN_INDEX);
 180         setTreeLabelProvider(new ControlFlowTreeLabelProvider());
 181         setFilterColumns(FILTER_COLUMN_NAMES);
 182         setFilterLabelProvider(new ControlFlowFilterLabelProvider());
 183         setEntryComparator(ControlFlowColumnComparators.BIRTH_TIME_COLUMN_COMPARATOR);
 184     }
 185
 186     @Override
 187     public void createPartControl(Composite parent) {
 188         super.createPartControl(parent);
 189         // add "Check active" Button to TimeGraphFilterDialog
 190         super.getTimeGraphCombo().addTimeGraphFilterCheckActiveButton(
 191                 new ControlFlowCheckActiveProvider(Messages.ControlFlowView_checkActiveLabel, Messages.ControlFlowView_checkActiveToolTip));
 192         // add "Uncheck inactive" Button to TimeGraphFilterDialog
 193         super.getTimeGraphCombo().addTimeGraphFilterUncheckInactiveButton(
 194                 new ControlFlowCheckActiveProvider(Messages.ControlFlowView_uncheckInactiveLabel, Messages.ControlFlowView_uncheckInactiveToolTip));
 195     }
 196
 197     /**
 198      * @since 2.0
 199      */
 200     @Override
 201     protected void fillTimeGraphEntryContextMenu(@NonNull IMenuManager menuManager) {
 202         ISelection selection = getSite().getSelectionProvider().getSelection();
 203         if (selection instanceof StructuredSelection) {
 204             StructuredSelection sSel = (StructuredSelection) selection;
 205             if (sSel.getFirstElement() instanceof ControlFlowEntry) {
 206                 ControlFlowEntry entry = (ControlFlowEntry) sSel.getFirstElement();
 207                 menuManager.add(new FollowThreadAction(ControlFlowView.this, entry.getName(), entry.getThreadId(), entry.getTrace()));
 208             }
 209         }
 210     }
 211
 212     @Override
 213     protected void fillLocalToolBar(IToolBarManager manager) {
 214         // add "Optimization" Button to local tool bar of Controlflow
 215         IAction optimizationAction = getOptimizationAction();
 216         manager.add(optimizationAction);
 217
 218         // add a separator to local tool bar
 219         manager.add(new Separator());
 220
 221         super.fillLocalToolBar(manager);
 222         IDialogSettings settings = Activator.getDefault().getDialogSettings();
 223         IDialogSettings section = settings.getSection(getClass().getName());
 224         if (section == null) {
 225             section = settings.addNewSection(getClass().getName());
 226         }
 227
 228         IAction hideArrowsAction = getTimeGraphCombo().getTimeGraphViewer().getHideArrowsAction(section);
 229         manager.add(hideArrowsAction);
 230
 231         IAction followArrowBwdAction = getTimeGraphCombo().getTimeGraphViewer().getFollowArrowBwdAction();
 232         followArrowBwdAction.setText(Messages.ControlFlowView_followCPUBwdText);
 233         followArrowBwdAction.setToolTipText(Messages.ControlFlowView_followCPUBwdText);
 234         manager.add(followArrowBwdAction);
 235
 236         IAction followArrowFwdAction = getTimeGraphCombo().getTimeGraphViewer().getFollowArrowFwdAction();
 237         followArrowFwdAction.setText(Messages.ControlFlowView_followCPUFwdText);
 238         followArrowFwdAction.setToolTipText(Messages.ControlFlowView_followCPUFwdText);
 239         manager.add(followArrowFwdAction);
 240
 241         IAction previousEventAction = new SearchEventAction(false, PackageMessages.ControlFlowView_PreviousEventJobName);
 242         previousEventAction.setText(PackageMessages.ControlFlowView_PreviousEventActionName);
 243         previousEventAction.setToolTipText(PackageMessages.ControlFlowView_PreviousEventActionTooltip);
 244         previousEventAction.setImageDescriptor(Activator.getDefault().getImageDescripterFromPath(PREV_EVENT_ICON_PATH));
 245         manager.add(previousEventAction);
 246
 247         IAction nextEventAction = new SearchEventAction(true, PackageMessages.ControlFlowView_NextEventJobName);
 248         nextEventAction.setText(PackageMessages.ControlFlowView_NextEventActionName);
 249         nextEventAction.setToolTipText(PackageMessages.ControlFlowView_NextEventActionTooltip);
 250         nextEventAction.setImageDescriptor(Activator.getDefault().getImageDescripterFromPath(NEXT_EVENT_ICON_PATH));
 251         manager.add(nextEventAction);
 252     }
 253
 254     private IAction getOptimizationAction() {
 255         if (fOptimizationAction == null) {
 256             fOptimizationAction = new OptimizationAction();
 257             fOptimizationAction.setImageDescriptor(Activator.getDefault().getImageDescripterFromPath(OPTIMIZE_ICON));
 258             fOptimizationAction.setText(Messages.ControlFlowView_optimizeLabel);
 259             fOptimizationAction.setToolTipText(Messages.ControlFlowView_optimizeToolTip);
 260         }
 261         return fOptimizationAction;
 262     }
 263
 264     @Override
 265     protected void fillLocalMenu(IMenuManager manager) {
 266         super.fillLocalMenu(manager);
 267         final MenuManager item = new MenuManager(Messages.ControlFlowView_threadPresentation);
 268         fFlatAction = createFlatAction();
 269         item.add(fFlatAction);
 270
 271         fHierarchicalAction = createHierarchicalAction();
 272         item.add(fHierarchicalAction);
 273         manager.add(item);
 274
 275     }
 276
 277     /**
 278      * Base Action for the "Go to Next/Previous Event for thread" actions
 279      */
 280     private class SearchEventAction extends Action {
 281
 282         private final boolean ifDirection;
 283         private final String ifJobName;
 284
 285         /**
 286          * Constructor
 287          *
 288          * @param direction
 289          *            The direction of the search, "true" for forwards and
 290          *            "false" for backwards.
 291          * @param jobName
 292          *            The name of the job that will be spawned
 293          */
 294         public SearchEventAction(boolean direction, String jobName) {
 295             ifDirection = direction;
 296             ifJobName = jobName;
 297         }
 298
 299         @Override
 300         public void run() {
 301             Job job = new Job(ifJobName) {
 302                 @Override
 303                 protected IStatus run(IProgressMonitor monitor) {
 304                     TimeGraphControl ctrl = getTimeGraphViewer().getTimeGraphControl();
 305                     ITimeGraphEntry traceEntry = ctrl.getSelectedTrace();
 306
 307                     long ts = getTimeGraphViewer().getSelectionBegin();
 308                     ITimeEvent selectedState = Utils.findEvent(traceEntry, ts, 0);
 309
 310                     if (selectedState == null) {
 311                         /* No selection currently in the view, do nothing */
 312                         return Status.OK_STATUS;
 313                     }
 314                     ITimeGraphEntry entry = selectedState.getEntry();
 315                     if (!(entry instanceof ControlFlowEntry)) {
 316                         return Status.OK_STATUS;
 317                     }
 318                     ControlFlowEntry cfEntry = (ControlFlowEntry) entry;
 319                     int tid = cfEntry.getThreadId();
 320
 321                     ITmfTrace trace = cfEntry.getTrace();
 322                     ITmfContext ctx = trace.seekEvent(TmfTimestamp.fromNanos(ts));
 323                     long rank = ctx.getRank();
 324                     ctx.dispose();
 325
 326                     Predicate<@NonNull ITmfEvent> predicate = event -> {
 327                         /*
 328                          * TODO Specific to the Control Flow View and kernel
 329                          * traces for now. Could be eventually generalized to
 330                          * anything represented by the time graph row.
 331                          */
 332                         Integer eventTid = KernelTidAspect.INSTANCE.resolve(event);
 333                         return (eventTid != null && eventTid.intValue() == tid);
 334                     };
 335
 336                     ITmfEvent event = (ifDirection ?
 337                             TmfTraceUtils.getNextEventMatching(cfEntry.getTrace(), rank, predicate, monitor) :
 338                             TmfTraceUtils.getPreviousEventMatching(cfEntry.getTrace(), rank, predicate, monitor));
 339                     if (event != null) {
 340                         TmfSignalManager.dispatchSignal(new TmfSelectionRangeUpdatedSignal(this, event.getTimestamp()));
 341                     }
 342                     return Status.OK_STATUS;
 343
 344                 }
 345             };
 346             /*
 347              * Make subsequent jobs not run concurrently, but wait after one
 348              * another.
 349              */
 350             job.setRule(fSearchActionMutexRule);
 351             job.schedule();
 352         }
 353     }
 354
 355     private IAction createHierarchicalAction() {
 356         IAction action = new Action(Messages.ControlFlowView_hierarchicalViewLabel, IAction.AS_RADIO_BUTTON) {
 357             @Override
 358             public void run() {
 359                 ITmfTrace parentTrace = getTrace();
 360                 synchronized (fFlatTraces) {
 361                     fFlatTraces.remove(parentTrace);
 362                     for (ITmfTrace trace : TmfTraceManager.getTraceSet(parentTrace)) {
 363                         final ITmfStateSystem ss = TmfStateSystemAnalysisModule.getStateSystem(trace, KernelAnalysisModule.ID);
 364                         for (TimeGraphEntry traceEntry : getEntryList(ss)) {
 365                             List<ControlFlowEntry> currentRootList = traceEntry.getChildren().stream()
 366                                     .filter(e -> e instanceof ControlFlowEntry)
 367                                     .map(e -> (ControlFlowEntry) e)
 368                                     .collect(Collectors.toList());
 369                             addEntriesToHierarchicalTree(currentRootList, traceEntry);
 370                         }
 371                     }
 372                 }
 373                 refresh();
 374             }
 375         };
 376         action.setChecked(true);
 377         action.setToolTipText(Messages.ControlFlowView_hierarchicalViewToolTip);
 378         return action;
 379     }
 380
 381     private IAction createFlatAction() {
 382         IAction action = new Action(Messages.ControlFlowView_flatViewLabel, IAction.AS_RADIO_BUTTON) {
 383             @Override
 384             public void run() {
 385                 ITmfTrace parentTrace = getTrace();
 386                 synchronized (fFlatTraces) {
 387                     fFlatTraces.add(parentTrace);
 388                     for (ITmfTrace trace : TmfTraceManager.getTraceSet(parentTrace)) {
 389                         final ITmfStateSystem ss = TmfStateSystemAnalysisModule.getStateSystem(trace, KernelAnalysisModule.ID);
 390                         List<@NonNull TimeGraphEntry> entryList = getEntryList(ss);
 391                         if (entryList != null) {
 392                             for (TimeGraphEntry traceEntry : entryList) {
 393                                 hierarchicalToFlatTree(traceEntry);
 394                             }
 395                         }
 396                     }
 397                 }
 398                 refresh();
 399             }
 400         };
 401         action.setToolTipText(Messages.ControlFlowView_flatViewToolTip);
 402         return action;
 403     }
 404
 405     @Override
 406     protected String getNextText() {
 407         return Messages.ControlFlowView_nextProcessActionNameText;
 408     }
 409
 410     @Override
 411     protected String getNextTooltip() {
 412         return Messages.ControlFlowView_nextProcessActionToolTipText;
 413     }
 414
 415     @Override
 416     protected String getPrevText() {
 417         return Messages.ControlFlowView_previousProcessActionNameText;
 418     }
 419
 420     @Override
 421     protected String getPrevTooltip() {
 422         return Messages.ControlFlowView_previousProcessActionToolTipText;
 423     }
 424
 425     /**
 426      * Get the optimization function for the scheduling column. In the base
 427      * implementation, this optimizes by Line arrows, but can be overidden.
 428      * <p>
 429      * It takes a collection of link events, looking at the entries being
 430      * linked, and returns a list of the proposed order. The list of indexes
 431      * should be in ascending order. There can be duplicates, but the values and
 432      * order should always be the same for the same input.
 433      *
 434      * @return the returned column order, where the integer is the tid of the
 435      *         entry, and the return value is the position, there can be
 436      *         duplicates.
 437      */
 438     public Function<Collection<ILinkEvent>, Map<Integer, Long>> getUpdatedSchedulingColumn() {
 439         return UPDATE_SCHEDULING_COLUMN_ALGO;
 440     }
 441
 442     /**
 443      * This is an optimization action used to find cliques of entries due to
 444      * links and put them closer together
 445      *
 446      * @author Samuel Gagnon
 447      */
 448     private final class OptimizationAction extends Action {
 449
 450         @Override
 451         public void runWithEvent(Event event) {
 452             ITmfTrace trace = getTrace();
 453             if (trace == null) {
 454                 return;
 455             }
 456
 457             createFlatAction().run();
 458
 459             /*
 460              * This method only returns the arrows in the current time interval
 461              * [a,b] of ControlFlowView. Thus, we only optimize for that time
 462              * interval
 463              */
 464             List<ILinkEvent> arrows = getTimeGraphViewer().getTimeGraphControl().getArrows();
 465             final ITmfStateSystem ss = TmfStateSystemAnalysisModule.getStateSystem(trace, KernelAnalysisModule.ID);
 466             List<TimeGraphEntry> currentList = getEntryList(ss);
 467
 468             Map<Integer, Long> orderedTidMap = getUpdatedSchedulingColumn().apply(arrows);
 469
 470             /*
 471              * Now that we have our list of ordered tid, it's time to assign a
 472              * position for each threads in the view. For this, we assign a
 473              * value to an invisible column and sort according to the values in
 474              * this column.
 475              */
 476             for (TimeGraphEntry entry : currentList) {
 477                 if (entry instanceof TraceEntry) {
 478                     for (TimeGraphEntry child : ((TraceEntry) entry).getChildren()) {
 479                         if (child instanceof ControlFlowEntry) {
 480                             ControlFlowEntry cEntry = (ControlFlowEntry) child;
 481                             /*
 482                              * If the thread is in our list, we give it a
 483                              * position. Otherwise, it means there's no activity
 484                              * in the current interval for that thread. We set
 485                              * its position to Long.MAX_VALUE so it goes to the
 486                              * bottom.
 487                              */
 488                             cEntry.setSchedulingPosition(orderedTidMap.getOrDefault(cEntry.getThreadId(), Long.MAX_VALUE));
 489                         }
 490                     }
 491                 }
 492             }
 493
 494             setEntryComparator(ControlFlowColumnComparators.SCHEDULING_COLUMN_COMPARATOR);
 495             refresh();
 496         }
 497
 498     }
 499
 500     /**
 501      * @author gbastien
 502      *
 503      */
 504     protected static class ControlFlowTreeLabelProvider extends TreeLabelProvider {
 505
 506         @Override
 507         public String getColumnText(Object element, int columnIndex) {
 508             if (element instanceof TraceEntry) {
 509                 if (columnIndex == 0) {
 510                     return ((TraceEntry) element).getName();
 511                 }
 512                 return ""; //$NON-NLS-1$
 513             }
 514             ControlFlowEntry entry = (ControlFlowEntry) element;
 515
 516             if (COLUMN_NAMES[columnIndex].equals(Messages.ControlFlowView_processColumn)) {
 517                 return entry.getName();
 518             } else if (COLUMN_NAMES[columnIndex].equals(Messages.ControlFlowView_tidColumn)) {
 519                 return Integer.toString(entry.getThreadId());
 520             } else if (COLUMN_NAMES[columnIndex].equals(Messages.ControlFlowView_ptidColumn)) {
 521                 if (entry.getParentThreadId() > 0) {
 522                     return Integer.toString(entry.getParentThreadId());
 523                 }
 524             } else if (COLUMN_NAMES[columnIndex].equals(Messages.ControlFlowView_birthTimeColumn)) {
 525                 return Utils.formatTime(entry.getStartTime(), TimeFormat.CALENDAR, Resolution.NANOSEC);
 526             } else if (COLUMN_NAMES[columnIndex].equals(Messages.ControlFlowView_traceColumn)) {
 527                 return entry.getTrace().getName();
 528             } else if (COLUMN_NAMES[columnIndex].equals(INVISIBLE_COLUMN)) {
 529                 return Long.toString(entry.getSchedulingPosition());
 530             }
 531             return ""; //$NON-NLS-1$
 532         }
 533
 534     }
 535
 536     private static class ControlFlowFilterLabelProvider extends TreeLabelProvider {
 537
 538         @Override
 539         public String getColumnText(Object element, int columnIndex) {
 540             if (element instanceof TraceEntry) {
 541                 if (columnIndex == 0) {
 542                     return ((TraceEntry) element).getName();
 543                 }
 544                 return ""; //$NON-NLS-1$
 545             }
 546             ControlFlowEntry entry = (ControlFlowEntry) element;
 547
 548             if (columnIndex == 0) {
 549                 return entry.getName();
 550             } else if (columnIndex == 1) {
 551                 return Integer.toString(entry.getThreadId());
 552             }
 553             return ""; //$NON-NLS-1$
 554         }
 555
 556     }
 557
 558     private static class TraceEntry extends TimeGraphEntry {
 559
 560         public TraceEntry(String name, long startTime, long endTime) {
 561             super(name, startTime, endTime);
 562         }
 563
 564         @Override
 565         public boolean hasTimeEvents() {
 566             return false;
 567         }
 568     }
 569
 570     @TmfSignalHandler
 571     @Override
 572     public void traceClosed(org.eclipse.tracecompass.tmf.core.signal.TmfTraceClosedSignal signal) {
 573         super.traceClosed(signal);
 574         synchronized (fFlatTraces) {
 575             fFlatTraces.remove(signal.getTrace());
 576         }
 577     }
 578
 579     @TmfSignalHandler
 580     @Override
 581     public void traceSelected(TmfTraceSelectedSignal signal) {
 582         super.traceSelected(signal);
 583         synchronized (fFlatTraces) {
 584             if (fFlatTraces.contains(signal.getTrace())) {
 585                 fHierarchicalAction.setChecked(false);
 586                 fFlatAction.setChecked(true);
 587             } else {
 588                 fFlatAction.setChecked(false);
 589                 fHierarchicalAction.setChecked(true);
 590             }
 591         }
 592     }
 593
 594     // ------------------------------------------------------------------------
 595     // Internal
 596     // ------------------------------------------------------------------------
 597
 598     @Override
 599     protected void buildEntryList(final ITmfTrace trace, final ITmfTrace parentTrace, final IProgressMonitor monitor) {
 600         final ITmfStateSystem ssq = TmfStateSystemAnalysisModule.getStateSystem(trace, KernelAnalysisModule.ID);
 601         if (ssq == null) {
 602             return;
 603         }
 604
 605         final List<ControlFlowEntry> entryList = new ArrayList<>();
 606         /** Map of trace entries */
 607         Map<ITmfTrace, TraceEntry> traceEntryMap = new HashMap<>();
 608         /** Map of control flow entries, key is a pair [threadId, cpuId] */
 609         final Map<Pair<Integer, Integer>, ControlFlowEntry> entryMap = new HashMap<>();
 610
 611         long start = ssq.getStartTime();
 612         setStartTime(Math.min(getStartTime(), start));
 613
 614         boolean complete = false;
 615         while (!complete) {
 616             if (monitor.isCanceled()) {
 617                 return;
 618             }
 619             complete = ssq.waitUntilBuilt(BUILD_UPDATE_TIMEOUT);
 620             if (ssq.isCancelled()) {
 621                 return;
 622             }
 623             long end = ssq.getCurrentEndTime();
 624             if (start == end && !complete) { // when complete execute one last time regardless of end time
 625                 continue;
 626             }
 627
 628             TraceEntry aTraceEntry = traceEntryMap.get(trace);
 629             if (aTraceEntry == null) {
 630                 aTraceEntry = new TraceEntry(trace.getName(), start, end + 1);
 631                 traceEntryMap.put(trace, aTraceEntry);
 632                 addToEntryList(parentTrace, ssq, Collections.singletonList(aTraceEntry));
 633             } else {
 634                 aTraceEntry.updateEndTime(end + 1);
 635             }
 636             final TraceEntry traceEntry = aTraceEntry;
 637
 638             final long resolution = Math.max(1, (end - ssq.getStartTime()) / getDisplayWidth());
 639             setEndTime(Math.max(getEndTime(), end + 1));
 640             final List<Integer> threadQuarks = ssq.getQuarks(Attributes.THREADS, "*"); //$NON-NLS-1$
 641             queryFullStates(ssq, start, end, resolution, monitor, new IQueryHandler() {
 642                 @Override
 643                 public void handle(List<List<ITmfStateInterval>> fullStates, List<ITmfStateInterval> prevFullState) {
 644                     for (int threadQuark : threadQuarks) {
 645                         String threadAttributeName = ssq.getAttributeName(threadQuark);
 646
 647                         Pair<Integer, Integer> entryKey = Attributes.parseThreadAttributeName(threadAttributeName);
 648                         int threadId = entryKey.getFirst();
 649
 650                         if (threadId < 0) { // ignore the 'unknown' (-1) thread
 651                             continue;
 652                         }
 653
 654                         int execNameQuark;
 655                         int ppidQuark;
 656                         try {
 657                             execNameQuark = ssq.getQuarkRelative(threadQuark, Attributes.EXEC_NAME);
 658                             ppidQuark = ssq.getQuarkRelative(threadQuark, Attributes.PPID);
 659                         } catch (AttributeNotFoundException e) {
 660                             /* No information on this thread (yet?), skip it for now */
 661                             continue;
 662                         }
 663                         ITmfStateInterval lastExecNameInterval = prevFullState == null || execNameQuark >= prevFullState.size() ? null : prevFullState.get(execNameQuark);
 664                         long lastExecNameStartTime = lastExecNameInterval == null ? -1 : lastExecNameInterval.getStartTime();
 665                         long lastExecNameEndTime = lastExecNameInterval == null ? -1 : lastExecNameInterval.getEndTime() + 1;
 666                         long lastPpidStartTime = prevFullState == null || ppidQuark >= prevFullState.size() ? -1 : prevFullState.get(ppidQuark).getStartTime();
 667                         for (List<ITmfStateInterval> fullState : fullStates) {
 668                             if (monitor.isCanceled()) {
 669                                 return;
 670                             }
 671                             if (execNameQuark >= fullState.size() || ppidQuark >= fullState.size()) {
 672                                 /* No information on this thread (yet?), skip it for now */
 673                                 continue;
 674                             }
 675                             ITmfStateInterval execNameInterval = fullState.get(execNameQuark);
 676                             ITmfStateInterval ppidInterval = fullState.get(ppidQuark);
 677                             long startTime = execNameInterval.getStartTime();
 678                             long endTime = execNameInterval.getEndTime() + 1;
 679                             if (startTime == lastExecNameStartTime && ppidInterval.getStartTime() == lastPpidStartTime) {
 680                                 continue;
 681                             }
 682                             boolean isNull = execNameInterval.getStateValue().isNull();
 683                             if (isNull && lastExecNameEndTime < startTime && lastExecNameEndTime != -1) {
 684                                 /*
 685                                  * There was a non-null interval in between the
 686                                  * full states, try to use it.
 687                                  */
 688                                 try {
 689                                     execNameInterval = ssq.querySingleState(startTime - 1, execNameQuark);
 690                                     ppidInterval = ssq.querySingleState(startTime - 1, ppidQuark);
 691                                     startTime = execNameInterval.getStartTime();
 692                                     endTime = execNameInterval.getEndTime() + 1;
 693                                 } catch (StateSystemDisposedException e) {
 694                                     /* ignored */
 695                                 }
 696                             }
 697                             if (!execNameInterval.getStateValue().isNull() &&
 698                                     execNameInterval.getStateValue().getType() == ITmfStateValue.Type.STRING) {
 699                                 String execName = execNameInterval.getStateValue().unboxStr();
 700                                 int ppid = ppidInterval.getStateValue().unboxInt();
 701                                 ControlFlowEntry entry = entryMap.get(entryKey);
 702                                 if (entry == null) {
 703                                     entry = new ControlFlowEntry(threadQuark, trace, execName, threadId, ppid, startTime, endTime);
 704                                     entryList.add(entry);
 705                                     entryMap.put(entryKey, entry);
 706                                 } else {
 707                                     /*
 708                                      * Update the name of the entry to the
 709                                      * latest execName and the parent thread id
 710                                      * to the latest ppid.
 711                                      */
 712                                     entry.setName(execName);
 713                                     entry.setParentThreadId(ppid);
 714                                     entry.updateEndTime(endTime);
 715                                 }
 716                             }
 717                             if (isNull) {
 718                                 entryMap.remove(entryKey);
 719                             }
 720                             lastExecNameStartTime = startTime;
 721                             lastExecNameEndTime = endTime;
 722                             lastPpidStartTime = ppidInterval.getStartTime();
 723                         }
 724                     }
 725                     synchronized (fFlatTraces) {
 726                         if (fFlatTraces.contains(parentTrace)) {
 727                             addEntriesToFlatTree(entryList, traceEntry);
 728                         } else {
 729                             addEntriesToHierarchicalTree(entryList, traceEntry);
 730                         }
 731                     }
 732                 }
 733             });
 734
 735             queryFullStates(ssq, ssq.getStartTime(), end, resolution, monitor, new IQueryHandler() {
 736                 @Override
 737                 public void handle(@NonNull List<List<ITmfStateInterval>> fullStates, @Nullable List<ITmfStateInterval> prevFullState) {
 738                     for (final TimeGraphEntry entry : traceEntry.getChildren()) {
 739                         if (monitor.isCanceled()) {
 740                             return;
 741                         }
 742                         buildStatusEvents(trace, parentTrace, ssq, fullStates, prevFullState, (ControlFlowEntry) entry, monitor, ssq.getStartTime(), end);
 743                     }
 744                 }
 745             });
 746
 747             if (parentTrace.equals(getTrace())) {
 748                 refresh();
 749             }
 750
 751             start = end;
 752         }
 753     }
 754
 755     /**
 756      * Add entries to the traces's child list in a flat fashion (no hierarchy).
 757      * If one entry has children, we do a depth first search to add each child
 758      * to the trace's child list and update the parent and child relations.
 759      */
 760     private static void hierarchicalToFlatTree(TimeGraphEntry traceEntry) {
 761         List<@NonNull TimeGraphEntry> rootList = traceEntry.getChildren();
 762         // We visit the children of every entry to add
 763         StreamFlattener<TimeGraphEntry> sf = new StreamFlattener<>(entry -> entry.getChildren().stream());
 764         Stream<TimeGraphEntry> allEntries = rootList.stream().flatMap(entry -> sf.flatten(entry));
 765
 766         // We add every entry that is missing from the trace's entry list
 767         List<@NonNull TimeGraphEntry> rootListToAdd = allEntries
 768                 .filter(entry -> !rootList.contains(entry))
 769                 .collect(Collectors.toList());
 770         rootList.forEach(entry -> {
 771             entry.clearChildren();
 772         });
 773         rootListToAdd.forEach(entry -> {
 774             traceEntry.addChild(entry);
 775             entry.clearChildren();
 776         });
 777     }
 778
 779     /**
 780      * Add entries to the traces's child list in a flat fashion (no hierarchy).
 781      */
 782     private static void addEntriesToFlatTree(List<@NonNull ControlFlowEntry> entryList, TimeGraphEntry traceEntry) {
 783         List<TimeGraphEntry> rootList = traceEntry.getChildren();
 784         for (ControlFlowEntry entry : entryList) {
 785             if (!rootList.contains(entry)) {
 786                 traceEntry.addChild(entry);
 787             }
 788         }
 789     }
 790
 791     /**
 792      * Add entries to the trace's child list in a hierarchical fashion.
 793      */
 794     private static void addEntriesToHierarchicalTree(List<ControlFlowEntry> entryList, TimeGraphEntry traceEntry) {
 795         List<TimeGraphEntry> rootList = traceEntry.getChildren();
 796
 797         for (ControlFlowEntry entry : entryList) {
 798             boolean root = (entry.getParent() == null || entry.getParent() == traceEntry);
 799             if (root && entry.getParentThreadId() > 0) {
 800                 for (ControlFlowEntry parent : entryList) {
 801                     /*
 802                      * Associate the parent entry only if their time overlap. A
 803                      * child entry may start before its parent, for example at
 804                      * the beginning of the trace if a parent has not yet
 805                      * appeared in the state system. We just want to make sure
 806                      * that the entry didn't start after the parent ended or
 807                      * ended before the parent started.
 808                      */
 809                     if (parent.getThreadId() == entry.getParentThreadId() &&
 810                             !(entry.getStartTime() > parent.getEndTime() ||
 811                             entry.getEndTime() < parent.getStartTime())) {
 812                         parent.addChild(entry);
 813                         root = false;
 814                         if (rootList.contains(entry)) {
 815                             traceEntry.removeChild(entry);
 816                         }
 817                         break;
 818                     }
 819                 }
 820             }
 821             if (root && (!rootList.contains(entry))) {
 822                 traceEntry.addChild(entry);
 823             }
 824         }
 825     }
 826
 827     private void buildStatusEvents(ITmfTrace trace, ITmfTrace parentTrace, ITmfStateSystem ss, @NonNull List<List<ITmfStateInterval>> fullStates,
 828             @Nullable List<ITmfStateInterval> prevFullState, ControlFlowEntry entry, @NonNull IProgressMonitor monitor, long start, long end) {
 829         if (start < entry.getEndTime() && end > entry.getStartTime()) {
 830             List<ITimeEvent> eventList = getEventList(entry, ss, fullStates, prevFullState, monitor);
 831             if (eventList == null) {
 832                 return;
 833             }
 834             /* Start a new event list on first iteration, then append to it */
 835             if (prevFullState == null) {
 836                 entry.setEventList(eventList);
 837             } else {
 838                 for (ITimeEvent event : eventList) {
 839                     entry.addEvent(event);
 840                 }
 841             }
 842             if (parentTrace.equals(getTrace())) {
 843                 redraw();
 844             }
 845         }
 846         for (ITimeGraphEntry child : entry.getChildren()) {
 847             if (monitor.isCanceled()) {
 848                 return;
 849             }
 850             buildStatusEvents(trace, parentTrace, ss, fullStates, prevFullState, (ControlFlowEntry) child, monitor, start, end);
 851         }
 852     }
 853
 854     @Override
 855     protected @Nullable List<ITimeEvent> getEventList(@NonNull TimeGraphEntry tgentry, ITmfStateSystem ss,
 856             @NonNull List<List<ITmfStateInterval>> fullStates, @Nullable List<ITmfStateInterval> prevFullState, @NonNull IProgressMonitor monitor) {
 857         List<ITimeEvent> eventList = null;
 858         if (!(tgentry instanceof ControlFlowEntry)) {
 859             return eventList;
 860         }
 861         ControlFlowEntry entry = (ControlFlowEntry) tgentry;
 862         try {
 863             int statusQuark = entry.getThreadQuark();
 864             eventList = new ArrayList<>(fullStates.size());
 865             ITmfStateInterval lastInterval = prevFullState == null || statusQuark >= prevFullState.size() ? null : prevFullState.get(statusQuark);
 866             long lastStartTime = lastInterval == null ? -1 : lastInterval.getStartTime();
 867             long lastEndTime = lastInterval == null ? -1 : lastInterval.getEndTime() + 1;
 868             for (List<ITmfStateInterval> fullState : fullStates) {
 869                 if (monitor.isCanceled()) {
 870                     return null;
 871                 }
 872                 if (statusQuark >= fullState.size()) {
 873                     /* No information on this thread (yet?), skip it for now */
 874                     continue;
 875                 }
 876                 ITmfStateInterval statusInterval = fullState.get(statusQuark);
 877                 long time = statusInterval.getStartTime();
 878                 if (time == lastStartTime) {
 879                     continue;
 880                 }
 881                 long duration = statusInterval.getEndTime() - time + 1;
 882                 int status = -1;
 883                 try {
 884                     status = statusInterval.getStateValue().unboxInt();
 885                 } catch (StateValueTypeException e) {
 886                     Activator.getDefault().logError(e.getMessage());
 887                 }
 888                 if (lastEndTime != time && lastEndTime != -1) {
 889                     eventList.add(new TimeEvent(entry, lastEndTime, time - lastEndTime));
 890                 }
 891                 if (!statusInterval.getStateValue().isNull()) {
 892                     eventList.add(new TimeEvent(entry, time, duration, status));
 893                 } else {
 894                     eventList.add(new NullTimeEvent(entry, time, duration));
 895                 }
 896                 lastStartTime = time;
 897                 lastEndTime = time + duration;
 898             }
 899         } catch (TimeRangeException e) {
 900             Activator.getDefault().logError(e.getMessage());
 901         }
 902         return eventList;
 903     }
 904
 905     /**
 906      * Returns a value corresponding to the selected entry.
 907      *
 908      * Used in conjunction with synchingToTime to change the selected entry. If
 909      * one of these methods is overridden in child class, then both should be.
 910      *
 911      * @param time
 912      *            The currently selected time
 913      * @return a value identifying the entry
 914      */
 915     private int getSelectionValue(long time) {
 916         int thread = -1;
 917         for (ITmfTrace trace : TmfTraceManager.getTraceSet(getTrace())) {
 918             if (thread > 0) {
 919                 break;
 920             }
 921             ITmfStateSystem ssq = TmfStateSystemAnalysisModule.getStateSystem(trace, KernelAnalysisModule.ID);
 922             if (ssq == null) {
 923                 continue;
 924             }
 925             if (time >= ssq.getStartTime() && time <= ssq.getCurrentEndTime()) {
 926                 List<Integer> currentThreadQuarks = ssq.getQuarks(Attributes.CPUS, "*", Attributes.CURRENT_THREAD); //$NON-NLS-1$
 927                 for (int currentThreadQuark : currentThreadQuarks) {
 928                     try {
 929                         ITmfStateInterval currentThreadInterval = ssq.querySingleState(time, currentThreadQuark);
 930                         int currentThread = currentThreadInterval.getStateValue().unboxInt();
 931                         if (currentThread > 0) {
 932                             int statusQuark = ssq.getQuarkAbsolute(Attributes.THREADS, Integer.toString(currentThread));
 933                             ITmfStateInterval statusInterval = ssq.querySingleState(time, statusQuark);
 934                             if (statusInterval.getStartTime() == time) {
 935                                 thread = currentThread;
 936                                 break;
 937                             }
 938                         }
 939                     } catch (AttributeNotFoundException | TimeRangeException | StateValueTypeException e) {
 940                         Activator.getDefault().logError(e.getMessage());
 941                     } catch (StateSystemDisposedException e) {
 942                         /* Ignored */
 943                     }
 944                 }
 945             }
 946         }
 947         return thread;
 948     }
 949
 950     @Override
 951     protected void synchingToTime(long time) {
 952         int selected = getSelectionValue(time);
 953         if (selected > 0) {
 954             for (Object element : getTimeGraphViewer().getExpandedElements()) {
 955                 if (element instanceof ControlFlowEntry) {
 956                     ControlFlowEntry entry = (ControlFlowEntry) element;
 957                     if (entry.getThreadId() == selected) {
 958                         getTimeGraphCombo().setSelection(entry);
 959                         break;
 960                     }
 961                 }
 962             }
 963         }
 964     }
 965
 966     @Override
 967     protected @NonNull List<ILinkEvent> getLinkList(ITmfStateSystem ss,
 968             @NonNull List<List<ITmfStateInterval>> fullStates, @Nullable List<ITmfStateInterval> prevFullState, @NonNull IProgressMonitor monitor) {
 969         List<ILinkEvent> list = new ArrayList<>();
 970         List<TimeGraphEntry> entryList = getEntryList(ss);
 971         if (entryList == null) {
 972             return list;
 973         }
 974         for (ITmfTrace trace : TmfTraceManager.getTraceSet(getTrace())) {
 975             List<Integer> currentThreadQuarks = ss.getQuarks(Attributes.CPUS, "*", Attributes.CURRENT_THREAD); //$NON-NLS-1$
 976             for (int currentThreadQuark : currentThreadQuarks) {
 977                 if (currentThreadQuark >= fullStates.get(0).size()) {
 978                     /* No information on this cpu (yet?), skip it for now */
 979                     continue;
 980                 }
 981                 List<ITmfStateInterval> currentThreadIntervals = new ArrayList<>(fullStates.size() + 2);
 982                 try {
 983                     /*
 984                      * Add the previous interval if it is the first query
 985                      * iteration and the first interval has currentThread=0. Add
 986                      * the following interval if the last interval has
 987                      * currentThread=0. These are diagonal arrows crossing the
 988                      * query iteration range.
 989                      */
 990                     if (prevFullState == null) {
 991                         ITmfStateInterval currentThreadInterval = fullStates.get(0).get(currentThreadQuark);
 992                         if (currentThreadInterval.getStateValue().unboxInt() == 0) {
 993                             long start = Math.max(currentThreadInterval.getStartTime() - 1, ss.getStartTime());
 994                             currentThreadIntervals.add(ss.querySingleState(start, currentThreadQuark));
 995                         }
 996                     }
 997                     for (List<ITmfStateInterval> fullState : fullStates) {
 998                         currentThreadIntervals.add(fullState.get(currentThreadQuark));
 999                     }
1000                     ITmfStateInterval currentThreadInterval = fullStates.get(fullStates.size() - 1).get(currentThreadQuark);
1001                     if (currentThreadInterval.getStateValue().unboxInt() == 0) {
1002                         long end = Math.min(currentThreadInterval.getEndTime() + 1, ss.getCurrentEndTime());
1003                         currentThreadIntervals.add(ss.querySingleState(end, currentThreadQuark));
1004                     }
1005                 } catch (StateSystemDisposedException e) {
1006                     /* Ignored */
1007                     return list;
1008                 }
1009                 int prevThread = 0;
1010                 long prevEnd = 0;
1011                 long lastEnd = 0;
1012                 for (ITmfStateInterval currentThreadInterval : currentThreadIntervals) {
1013                     if (monitor.isCanceled()) {
1014                         return list;
1015                     }
1016                     if (currentThreadInterval.getEndTime() + 1 == lastEnd) {
1017                         continue;
1018                     }
1019                     long time = currentThreadInterval.getStartTime();
1020                     if (time != lastEnd) {
1021                         // don't create links where there are gaps in intervals due to the resolution
1022                         prevThread = 0;
1023                         prevEnd = 0;
1024                     }
1025                     int thread = currentThreadInterval.getStateValue().unboxInt();
1026                     if (thread > 0 && prevThread > 0) {
1027                         ITimeGraphEntry prevEntry = findEntry(entryList, trace, prevThread);
1028                         ITimeGraphEntry nextEntry = findEntry(entryList, trace, thread);
1029                         list.add(new TimeLinkEvent(prevEntry, nextEntry, prevEnd, time - prevEnd, 0));
1030                     }
1031                     lastEnd = currentThreadInterval.getEndTime() + 1;
1032                     if (thread != 0) {
1033                         prevThread = thread;
1034                         prevEnd = lastEnd;
1035                     }
1036                 }
1037             }
1038         }
1039         return list;
1040     }
1041
1042     private ControlFlowEntry findEntry(List<TimeGraphEntry> entryList, ITmfTrace trace, int threadId) {
1043         for (TimeGraphEntry entry : entryList) {
1044             if (entry instanceof ControlFlowEntry) {
1045                 ControlFlowEntry controlFlowEntry = (ControlFlowEntry) entry;
1046                 if (controlFlowEntry.getThreadId() == threadId && controlFlowEntry.getTrace() == trace) {
1047                     return controlFlowEntry;
1048                 }
1049             }
1050             if (entry.hasChildren()) {
1051                 ControlFlowEntry controlFlowEntry = findEntry(entry.getChildren(), trace, threadId);
1052                 if (controlFlowEntry != null) {
1053                     return controlFlowEntry;
1054                 }
1055             }
1056         }
1057         return null;
1058     }
1059 }