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

   1 /*******************************************************************************
   2  * Copyright (c) 2013, 2014 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.linuxtools.tmf.core.callstack;
  14
  15 import org.eclipse.linuxtools.internal.tmf.core.Activator;
  16 import org.eclipse.linuxtools.tmf.core.event.ITmfEvent;
  17 import org.eclipse.linuxtools.tmf.core.exceptions.AttributeNotFoundException;
  18 import org.eclipse.linuxtools.tmf.core.exceptions.StateValueTypeException;
  19 import org.eclipse.linuxtools.tmf.core.exceptions.TimeRangeException;
  20 import org.eclipse.linuxtools.tmf.core.statesystem.AbstractTmfStateProvider;
  21 import org.eclipse.linuxtools.tmf.core.statevalue.ITmfStateValue;
  22 import org.eclipse.linuxtools.tmf.core.statevalue.TmfStateValue;
  23 import org.eclipse.linuxtools.tmf.core.timestamp.ITmfTimestamp;
  24 import org.eclipse.linuxtools.tmf.core.trace.ITmfTrace;
  25 import org.eclipse.osgi.util.NLS;
  26
  27 /**
  28  * The state provider for traces that support the Call Stack view.
  29  *
  30  * The attribute tree should have the following structure:
  31  *<pre>
  32  * (root)
  33  *   \-- Threads
  34  *        |-- (Thread 1)
  35  *        |    \-- CallStack (stack-attribute)
  36  *        |         |-- 1
  37  *        |         |-- 2
  38  *        |        ...
  39  *        |         \-- n
  40  *        |-- (Thread 2)
  41  *        |    \-- CallStack (stack-attribute)
  42  *        |         |-- 1
  43  *        |         |-- 2
  44  *        |        ...
  45  *        |         \-- n
  46  *       ...
  47  *        \-- (Thread n)
  48  *             \-- CallStack (stack-attribute)
  49  *                  |-- 1
  50  *                  |-- 2
  51  *                 ...
  52  *                  \-- n
  53  *</pre>
  54  * where:
  55  * <br>
  56  * (Thread n) is an attribute whose name is the name of the thread
  57  * <br>
  58  * CallStack is a stack-attribute whose pushed values are either a string,
  59  * int or long representing the function name or address in the call stack.
  60  * The type of value used must be constant for a particular CallStack.
  61  *
  62  * @author Patrick Tasse
  63  * @since 2.0
  64  */
  65 public abstract class CallStackStateProvider extends AbstractTmfStateProvider {
  66
  67     /** Thread attribute */
  68     public static final String THREADS = "Threads"; //$NON-NLS-1$
  69     /** CallStack stack-attribute */
  70     public static final String CALL_STACK = "CallStack"; //$NON-NLS-1$
  71     /** Undefined function exit name */
  72     public static final String UNDEFINED = "UNDEFINED"; //$NON-NLS-1$
  73
  74     /** CallStack state system ID */
  75     private static final String ID = "org.eclipse.linuxtools.tmf.callstack"; //$NON-NLS-1$
  76     /** Dummy function name for when no function is expected */
  77     private static final String NO_FUNCTION = "no function"; //$NON-NLS-1$
  78
  79     /**
  80      * Default constructor
  81      *
  82      * @param trace
  83      *            The trace for which we build this state system
  84      */
  85     public CallStackStateProvider(ITmfTrace trace) {
  86         super(trace, ITmfEvent.class, ID);
  87     }
  88
  89     @Override
  90     protected void eventHandle(ITmfEvent event) {
  91         if (!considerEvent(event)) {
  92             return;
  93         }
  94         try {
  95             /* Check if the event is a function entry */
  96             String functionEntryName = functionEntry(event);
  97             if (functionEntryName != null) {
  98                 long timestamp = event.getTimestamp().normalize(0, ITmfTimestamp.NANOSECOND_SCALE).getValue();
  99                 String thread = getThreadName(event);
 100                 int quark = ss.getQuarkAbsoluteAndAdd(THREADS, thread, CALL_STACK);
 101                 ITmfStateValue value = TmfStateValue.newValueString(functionEntryName);
 102                 ss.pushAttribute(timestamp, value, quark);
 103                 return;
 104             }
 105
 106             /* Check if the event is a function exit */
 107             String functionExitName = functionExit(event);
 108             if (functionExitName != null) {
 109                 long timestamp = event.getTimestamp().normalize(0, ITmfTimestamp.NANOSECOND_SCALE).getValue();
 110                 String thread = getThreadName(event);
 111                 int quark = ss.getQuarkAbsoluteAndAdd(THREADS, thread, CALL_STACK);
 112                 ITmfStateValue poppedValue = ss.popAttribute(timestamp, quark);
 113                 String poppedName = (poppedValue == null ? NO_FUNCTION : poppedValue.unboxStr());
 114
 115                 /*
 116                  * Verify that the value we are popping matches the one in the
 117                  * event field, unless the latter is undefined.
 118                  */
 119                 if (!functionExitName.equals(UNDEFINED) &&
 120                         !functionExitName.equals(poppedName)) {
 121                     Activator.logWarning(NLS.bind(
 122                             Messages.CallStackStateProvider_UnmatchedPoppedValue,
 123                             functionExitName,
 124                             poppedName));
 125                 }
 126             }
 127
 128         } catch (TimeRangeException e) {
 129             e.printStackTrace();
 130         } catch (AttributeNotFoundException e) {
 131             e.printStackTrace();
 132         } catch (StateValueTypeException e) {
 133             e.printStackTrace();
 134         }
 135     }
 136
 137     /**
 138      * Check if this event should be considered at all for function entry/exit
 139      * analysis. This check is only run once per event, before
 140      * {@link #functionEntry} and {@link #functionExit} (to avoid repeating
 141      * checks in those methods).
 142      *
 143      * @param event
 144      *            The event to check
 145      * @return If false, the event will be ignored by the state provider. If
 146      *         true processing will continue.
 147      * @since 3.0
 148      */
 149     protected abstract boolean considerEvent(ITmfEvent event);
 150
 151     /**
 152      * Check an event if it indicates a function entry.
 153      *
 154      * @param event
 155      *            An event to check for function entry
 156      * @return The function name of the function entry, or null if not a
 157      *         function entry.
 158      */
 159     protected abstract String functionEntry(ITmfEvent event);
 160
 161     /**
 162      * Check an event if it indicates a function exit.
 163      *
 164      * @param event
 165      *            An event to check for function exit
 166      * @return The function name, or UNDEFINED, for a function exit, or null if
 167      *         not a function exit.
 168      */
 169     protected abstract String functionExit(ITmfEvent event);
 170
 171     /**
 172      * Return the thread name of a function entry or exit event.
 173      *
 174      * @param event
 175      *            The event
 176      * @return The thread name (as will be shown in the view)
 177      * @since 3.0
 178      */
 179     protected abstract String getThreadName(ITmfEvent event);
 180 }