Bug 1461938 part 34 - Move IteratorCache from JSCompartment to ObjectRealm. r=jonco

js/src/vm/Iteration.cpp

@@ -823,7 +823,7 @@ LookupInIteratorCache(JSContext* cx, JSObject* obj, uint32_t* numGuards)
     *numGuards = guards.length();
 
     IteratorHashPolicy::Lookup lookup(guards.begin(), guards.length(), key);
-    auto p = cx->compartment()->iteratorCache.lookup(lookup);
+    auto p = ObjectRealm::get(obj).iteratorCache.lookup(lookup);
     if (!p)
         return nullptr;
 
@@ -873,7 +873,7 @@ StoreInIteratorCache(JSContext* cx, JSObject* obj, PropertyIteratorObject* itero
                                       ni->guardCount(),
                                       ni->guard_key);
 
-    JSCompartment::IteratorCache& cache = cx->compartment()->iteratorCache;
+    ObjectRealm::IteratorCache& cache = ObjectRealm::get(obj).iteratorCache;
     bool ok;
     auto p = cache.lookupForAdd(lookup);
     if (MOZ_LIKELY(!p)) {

js/src/vm/JSCompartment.cpp

@@ -109,6 +109,12 @@ JSCompartment::init(JSContext* maybecx)
 bool
 ObjectRealm::init(JSContext* maybecx)
 {
+    if (!iteratorCache.init()) {
+        if (maybecx)
+            ReportOutOfMemory(maybecx);
+        return false;
+    }
+
     NativeIteratorSentinel sentinel(NativeIterator::allocateSentinel(maybecx));
     if (!sentinel)
         return false;
@@ -141,8 +147,7 @@ Realm::init(JSContext* maybecx)
         return false;
 
     if (!savedStacks_.init() ||
-        !varNames_.init() ||
-        !iteratorCache.init())
+        !varNames_.init())
     {
         if (maybecx)
             ReportOutOfMemory(maybecx);
@@ -1013,7 +1018,7 @@ Realm::purge()
     dtoaCache.purge();
     newProxyCache.purge();
     objectGroups.purge();
-    iteratorCache.clearAndShrink();
+    objects_.iteratorCache.clearAndShrink();
     arraySpeciesLookup.purge();
 }
 

js/src/vm/JSCompartment.h

@@ -592,11 +592,6 @@ struct JSCompartment
   public:
     js::RegExpCompartment        regExps;
 
-    using IteratorCache = js::HashSet<js::PropertyIteratorObject*,
-                                      js::IteratorHashPolicy,
-                                      js::SystemAllocPolicy>;
-    IteratorCache iteratorCache;
-
     // Recompute the probability with which this compartment should record
     // profiling data (stack traces, allocations log, etc.) about each
     // allocation. We consult the probabilities requested by the Debugger
@@ -752,6 +747,11 @@ class ObjectRealm
     // object. Both keys and values are in this realm.
     js::UniquePtr<js::ObjectWeakMap> objectMetadataTable;
 
+    using IteratorCache = js::HashSet<js::PropertyIteratorObject*,
+                                      js::IteratorHashPolicy,
+                                      js::SystemAllocPolicy>;
+    IteratorCache iteratorCache;
+
     static inline ObjectRealm& get(const JSObject* obj);
 
     explicit ObjectRealm(JS::Zone* zone);