Indexer: adds cache hits and misses to tracable indexer statistics.

core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/index/CIndex.java

@@ -461,4 +461,26 @@ public class CIndex implements IIndex {
 			return flatten(result);
 		}
 	}
+	
+	public long getCacheHits() {
+		long result= 0;
+		for (int i = 0; i < fFragments.length; i++) {
+			result+= fFragments[i].getCacheHits();
+		}
+		return result;
+	}
+
+	public long getCacheMisses() {
+		long result= 0;
+		for (int i = 0; i < fFragments.length; i++) {
+			result+= fFragments[i].getCacheMisses();
+		}
+		return result;
+	}
+
+	public void resetCacheCounters() {
+		for (int i = 0; i < fFragments.length; i++) {
+			fFragments[i].resetCacheCounters();
+		}
+	}
 }

core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/index/IIndexFragment.java

@@ -173,4 +173,19 @@ public interface IIndexFragment {
 	 * @see IIndexFragment#PROPERTY_FRAGMENT_ID
 	 */
 	public String getProperty(String propertyName) throws CoreException;
+
+	/**
+	 * Resets the counters for cache-hits and cache-misses.
+	 */
+	void resetCacheCounters();
+	
+	/**
+	 * Returns cache hits since last reset of counters.
+	 */
+	long getCacheHits();
+	
+	/**
+	 * Returns cache misses since last reset of counters.
+	 */
+	long getCacheMisses();
 }

core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/index/IWritableIndex.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2006 Wind River Systems, Inc. and others.
+ * Copyright (c) 2006, 2007 Wind River Systems, Inc. and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -58,4 +58,19 @@ public interface IWritableIndex extends IIndex {
 	 * Releases a write lock, reestablishing a certain amount of read locks.
 	 */
 	void releaseWriteLock(int establishReadLockCount);
+	
+	/**
+	 * Resets the counters for cache-hits
+	 */
+	void resetCacheCounters();
+	
+	/**
+	 * Returns cache hits since last reset of counters.
+	 */
+	long getCacheHits();
+	
+	/**
+	 * Returns cache misses since last reset of counters.
+	 */
+	long getCacheMisses();
 }

core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/PDOM.java

@@ -694,4 +694,16 @@ public class PDOM extends PlatformObject implements IIndexFragment, IPDOM {
 		fLinkageIDCache.clear();
 		db.close();
 	}
+
+	public long getCacheHits() {
+		return db.getCacheHits();
+	}
+
+	public long getCacheMisses() {
+		return db.getCacheMisses();
+	}
+
+	public void resetCacheCounters() {
+		db.resetCacheCounters();
+	}		
 }

core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/db/Database.java

@@ -66,6 +66,8 @@ public class Database {
 	
 	private long malloced;
 	private long freed;
+	private long cacheHits;
+	private long cacheMisses;
 	private ChunkCache fCache;
 	
 	// public for tests only, you shouldn't need these
@@ -164,6 +166,7 @@ public class Database {
 		Chunk chunk = chunks[index];		
 		if (chunk != null && chunk.fWritable == fWritable) {
 			chunk.fCacheHitFlag= true;
+			cacheHits++;
 			return chunk;
 		}
 		
@@ -172,8 +175,12 @@ public class Database {
 		synchronized(fCache) {
 			chunk= chunks[index];
 			if (chunk == null) {
+				cacheMisses++;
 				chunk = chunks[index] = new Chunk(this, index);
 			}
+			else {
+				cacheHits++;
+			}
 			fCache.add(chunk, fWritable);
 			return chunk;
 		}
@@ -457,4 +464,16 @@ public class Database {
 			}
 		}
 	}
+	
+	public void resetCacheCounters() {
+		cacheHits= cacheMisses= 0;
+	}
+	
+	public long getCacheHits() {
+		return cacheHits;
+	}
+	
+	public long getCacheMisses() {
+		return cacheMisses;
+	}
 }

core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/indexer/PDOMIndexerTask.java

@@ -275,7 +275,7 @@ public abstract class PDOMIndexerTask extends PDOMWriter implements IPDOMIndexer
 		}
 	}
 
-	protected void traceEnd(long start) {
+	protected void traceEnd(long start, IWritableIndex index) {
 		if (checkDebugOption(IPDOMIndexerTask.TRACE_STATISTICS, TRUE)) {
 			IndexerProgress info= getProgressInformation();
 			String name= getClass().getName();
@@ -300,7 +300,16 @@ public abstract class PDOMIndexerTask extends PDOMWriter implements IPDOMIndexer
 					+ fStatistics.fReferenceCount + " references, " //$NON-NLS-1$
 					+ fStatistics.fErrorCount + " errors, " //$NON-NLS-1$
 					+ fStatistics.fProblemBindingCount + "(" + nf.format(problemPct) + ") problems.");  //$NON-NLS-1$ //$NON-NLS-2$
-		}
-	}
 			
+			if (index != null) {
+				long misses= index.getCacheMisses();
+				long hits= index.getCacheHits();
+				long tries= misses+hits;
+				double missPct= tries==0 ? 0.0 : (double) misses / (double) tries;
+				System.out.println(name + " Cache: " //$NON-NLS-1$
+					+ hits + " hits, "  //$NON-NLS-1$
+					+ misses + "(" + nf.format(missPct)+ ") misses."); //$NON-NLS-1$ //$NON-NLS-2$
+			}
+		}
+	}
 }

core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/indexer/fast/PDOMFastIndexerTask.java

@@ -100,11 +100,12 @@ class PDOMFastIndexerTask extends PDOMIndexerTask {
 			CCorePlugin.log(e);
 		} catch (InterruptedException e) {
 		}
-		traceEnd(start);
+		traceEnd(start, index);
 	}
 
 	private void setupIndexAndReaderFactory() throws CoreException {
 		this.index= ((IWritableIndexManager) CCorePlugin.getIndexManager()).getWritableIndex(getProject());
+		this.index.resetCacheCounters();
 		this.fIflCache = new HashMap/*<String,IIndexFileLocation>*/();
 		this.fCodeReaderFactory = new IndexBasedCodeReaderFactory(index, fIflCache);
 	}

core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/indexer/full/PDOMFullIndexerTask.java

@@ -101,11 +101,12 @@ class PDOMFullIndexerTask extends PDOMIndexerTask {
 			CCorePlugin.log(e);
 		} catch (InterruptedException e) {
 		}
-		traceEnd(start);
+		traceEnd(start, fIndex);
 	}
 
 	private void setupIndex() throws CoreException {
 		fIndex = ((IWritableIndexManager) CCorePlugin.getIndexManager()).getWritableIndex(getProject());
+		fIndex.resetCacheCounters();
 	}
 
 	private void registerTUsInReaderFactory(Collection/*<ITranslationUnit>*/ sources)