Followup fixes to making cycle collector use more efficient hashtables: shrink size of table and fix warnings on 64-bit machines. b=377606 sr=peterv r=graydon

js/src/xpconnect/src/nsXPConnect.cpp

@@ -114,8 +114,6 @@ nsXPConnect::nsXPConnect()
 typedef nsBaseHashtable<nsVoidPtrHashKey, nsISupports*, nsISupports*> ScopeSet;
 #endif
 
-#define OBJ_REFCOUNT_ENTRIES 100000
-
 static const PLDHashTableOps RefCountOps =
 {
     PL_DHashAllocTable,
@@ -158,15 +156,16 @@ struct JSObjectRefcounts
     void InitRefCounts()
     {
         if(!PL_DHashTableInit(&mRefCounts, &RefCountOps, nsnull,
-                              sizeof(ObjRefCount),
-                              PL_DHASH_DEFAULT_CAPACITY(OBJ_REFCOUNT_ENTRIES)))
+                              sizeof(ObjRefCount), 65536))
             mRefCounts.ops = nsnull;
     }
     void Clear()
     {
+        if(!mRefCounts.ops || mRefCounts.entryCount > 0) {
             if(mRefCounts.ops)
                 PL_DHashTableFinish(&mRefCounts);
             InitRefCounts();
+        }
 #ifndef XPCONNECT_STANDALONE
         mScopes.Clear();
 #endif

xpcom/base/nsCycleCollector.cpp

@@ -296,13 +296,11 @@ enum NodeColor { black, white, grey };
 struct PtrInfo
     : public PLDHashEntryStub
 {
-#define WORD_MINUS_2_BITS ((PR_BYTES_PER_WORD * 8) - 2)
     PRUint32 mColor : 2;
-    PRUint32 mInternalRefs : WORD_MINUS_2_BITS;
+    PRUint32 mInternalRefs : 30;
     // FIXME: mLang expands back to a full word when bug 368774 lands.
     PRUint32 mLang : 2;
-    PRUint32 mRefCount : WORD_MINUS_2_BITS;
-#undef WORD_MINUS_2_BITS
+    PRUint32 mRefCount : 30;
 
 #ifdef DEBUG_CC
     size_t mBytes;
@@ -326,8 +324,6 @@ InitPtrInfo(PLDHashTable *table, PLDHashEntryHdr *entry, const void *key)
     return PR_TRUE;
 }
 
-#define GCTABLE_N_ENTRIES 100000
-
 static PLDHashTableOps GCTableOps = {
     PL_DHashAllocTable,
     PL_DHashFreeTable,
@@ -356,15 +352,17 @@ struct GCTable
     void Init()
     {
         if (!PL_DHashTableInit(&mTab, &GCTableOps, nsnull, sizeof(PtrInfo),
-                               PL_DHASH_DEFAULT_CAPACITY(GCTABLE_N_ENTRIES)))
+                               32768))
             mTab.ops = nsnull;
     }
     void Clear()
     {
+        if (!mTab.ops || mTab.entryCount > 0) {
             if (mTab.ops)
                 PL_DHashTableFinish(&mTab);
             Init();
         }
+    }
 
     PtrInfo *Lookup(void *key)
     {