tmf/org.eclipse.tracecompass.tmf.core/src/org/eclipse/tracecompass/tmf/core/callstack/CallStackStateProvider.java

   1 /*******************************************************************************
   2  * Copyright (c) 2013, 2015 Ericsson
   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  *******************************************************************************/
  12
  13 package org.eclipse.tracecompass.tmf.core.callstack;
  14
  15 import static org.eclipse.tracecompass.common.core.NonNullUtils.checkNotNull;
  16
  17 import org.eclipse.jdt.annotation.NonNullByDefault;
  18 import org.eclipse.jdt.annotation.Nullable;
  19 import org.eclipse.osgi.util.NLS;
  20 import org.eclipse.tracecompass.internal.tmf.core.Activator;
  21 import org.eclipse.tracecompass.statesystem.core.ITmfStateSystemBuilder;
  22 import org.eclipse.tracecompass.statesystem.core.exceptions.AttributeNotFoundException;
  23 import org.eclipse.tracecompass.statesystem.core.statevalue.ITmfStateValue;
  24 import org.eclipse.tracecompass.statesystem.core.statevalue.TmfStateValue;
  25 import org.eclipse.tracecompass.tmf.core.event.ITmfEvent;
  26 import org.eclipse.tracecompass.tmf.core.statesystem.AbstractTmfStateProvider;
  27 import org.eclipse.tracecompass.tmf.core.statesystem.ITmfStateProvider;
  28 import org.eclipse.tracecompass.tmf.core.trace.ITmfTrace;
  29
  30 /**
  31  * The state provider for traces that support the Call Stack view.
  32  *
  33  * The attribute tree should have the following structure:
  34  *
  35  * <pre>
  36  * (root)
  37  *   +-- Processes
  38  *       +-- (PID 1000)
  39  *       |    +-- (TID 1000)
  40  *       |    |    +-- CallStack (stack-attribute)
  41  *       |    |         +-- 1
  42  *       |    |         +-- 2
  43  *       |    |        ...
  44  *       |    |         +-- n
  45  *       |    +-- (TID 1001)
  46  *       |         +-- CallStack (stack-attribute)
  47  *       |              +-- 1
  48  *       |              +-- 2
  49  *       |             ...
  50  *       |              +-- n
  51  *       |
  52  *       +-- (PID 2000)
  53  *            +-- (TID 2000)
  54  *                 +-- CallStack (stack-attribute)
  55  *                      +-- 1
  56  *                      +-- 2
  57  *                     ...
  58  *                      +-- n
  59  * </pre>
  60  *
  61  * where:
  62  * <ul>
  63  * <li>(PID n) is an attribute name representing a unique process identifier.
  64  * </li>
  65  * <li>(TID n) is an attribute whose name is the display name of the thread.
  66  * Optionally, its value is a long representing the thread id, used for sorting.
  67  * </li>
  68  * <li>"CallStack" is a stack-attribute whose pushed values are either a string,
  69  * int or long representing the function name or address in the call stack. The
  70  * type of value used must be constant for a particular CallStack.</li>
  71  * </ul>
  72  *
  73  * @author Patrick Tasse
  74  */
  75 @NonNullByDefault
  76 public abstract class CallStackStateProvider extends AbstractTmfStateProvider {
  77
  78     /**
  79      * Thread attribute
  80      *
  81      * @since 2.0
  82      */
  83     public static final String PROCESSES = "Processes"; //$NON-NLS-1$
  84
  85     /** CallStack stack-attribute */
  86     public static final String CALL_STACK = "CallStack"; //$NON-NLS-1$
  87
  88     /**
  89      * Undefined process ID
  90      *
  91      * @since 2.0
  92      */
  93     protected static final int UNDEFINED_PID = -1;
  94
  95     /** Undefined function exit name */
  96     protected static final String UNDEFINED = "UNDEFINED"; //$NON-NLS-1$
  97
  98     /** CallStack state system ID */
  99     private static final String ID = "org.eclipse.linuxtools.tmf.callstack"; //$NON-NLS-1$
 100
 101     /**
 102      * Default constructor
 103      *
 104      * @param trace
 105      *            The trace for which we build this state system
 106      */
 107     public CallStackStateProvider(ITmfTrace trace) {
 108         super(trace, ID);
 109     }
 110
 111     @Override
 112     protected void eventHandle(ITmfEvent event) {
 113         if (!considerEvent(event)) {
 114             return;
 115         }
 116
 117         ITmfStateSystemBuilder ss = checkNotNull(getStateSystemBuilder());
 118
 119         try {
 120             /* Check if the event is a function entry */
 121             ITmfStateValue functionEntryName = functionEntry(event);
 122             if (functionEntryName != null) {
 123                 long timestamp = event.getTimestamp().toNanos();
 124                 int pid = getProcessId(event);
 125                 String threadName = getThreadName(event);
 126                 int threadQuark = ss.getQuarkAbsoluteAndAdd(PROCESSES, Integer.toString(pid), threadName);
 127
 128                 long threadId = getThreadId(event);
 129                 ss.updateOngoingState(TmfStateValue.newValueLong(threadId), threadQuark);
 130
 131                 int callStackQuark = ss.getQuarkRelativeAndAdd(threadQuark, CALL_STACK);
 132                 ITmfStateValue value = functionEntryName;
 133                 ss.pushAttribute(timestamp, value, callStackQuark);
 134                 return;
 135             }
 136
 137             /* Check if the event is a function exit */
 138             ITmfStateValue functionExitState = functionExit(event);
 139             if (functionExitState != null) {
 140                 long timestamp = event.getTimestamp().toNanos();
 141                 int pid = getProcessId(event);
 142                 String thread = getThreadName(event);
 143                 int quark = ss.getQuarkAbsoluteAndAdd(PROCESSES, Integer.toString(pid), thread, CALL_STACK);
 144                 ITmfStateValue poppedValue = ss.popAttribute(timestamp, quark);
 145                 /*
 146                  * Verify that the value we are popping matches the one in the
 147                  * event field, unless the latter is undefined.
 148                  */
 149                 if (!functionExitState.isNull() && !functionExitState.equals(poppedValue)) {
 150                     Activator.logWarning(NLS.bind(
 151                             Messages.CallStackStateProvider_UnmatchedPoppedValue,
 152                             functionExitState,
 153                             poppedValue));
 154                 }
 155             }
 156
 157         } catch (AttributeNotFoundException e) {
 158             e.printStackTrace();
 159         }
 160     }
 161
 162     /**
 163      * Restrict the return type for {@link ITmfStateProvider#getNewInstance}.
 164      *
 165      * @since 2.0
 166      */
 167     @Override
 168     public abstract CallStackStateProvider getNewInstance();
 169
 170     /**
 171      * Check if this event should be considered at all for function entry/exit
 172      * analysis. This check is only run once per event, before
 173      * {@link #functionEntry} and {@link #functionExit} (to avoid repeating
 174      * checks in those methods).
 175      *
 176      * @param event
 177      *            The event to check
 178      * @return If false, the event will be ignored by the state provider. If
 179      *         true processing will continue.
 180      */
 181     protected abstract boolean considerEvent(ITmfEvent event);
 182
 183     /**
 184      * Check an event if it indicates a function entry.
 185      *
 186      * @param event
 187      *            An event to check for function entry
 188      * @return The state value representing the function being entered, or null
 189      *         if not a function entry
 190      * @since 2.0
 191      */
 192     protected abstract @Nullable ITmfStateValue functionEntry(ITmfEvent event);
 193
 194     /**
 195      * Check an event if it indicates a function exit.
 196      *
 197      * @param event
 198      *            An event to check for function exit
 199      * @return The state value representing the function being exited, or
 200      *         TmfStateValue#nullValue() if the exited function is undefined,
 201      *         or null if not a function exit.
 202      * @since 2.0
 203      */
 204     protected abstract @Nullable ITmfStateValue functionExit(ITmfEvent event);
 205
 206     /**
 207      * Return the process ID of a function entry event.
 208      *
 209      * Use {@link #UNDEFINED_PID} if it is not known.
 210      *
 211      * @param event
 212      *            The event
 213      * @return The process ID
 214      * @since 2.0
 215      */
 216     protected abstract int getProcessId(ITmfEvent event);
 217
 218     /**
 219      * Return the thread id of a function entry event.
 220      *
 221      * @param event
 222      *            The event
 223      * @return The thread id
 224      * @since 2.0
 225      */
 226     protected abstract long getThreadId(ITmfEvent event);
 227
 228     /**
 229      * Return the thread name of a function entry or exit event.
 230      *
 231      * @param event
 232      *            The event
 233      * @return The thread name (as will be shown in the view)
 234      */
 235     protected abstract String getThreadName(ITmfEvent event);
 236 }