Bug 1196848 - Add Zone::uniqueIds to about:memory reports; r=njn

--HG--
extra : rebase_source : 0b7173fc4d344f55b5b8c41e010ea65c7048091e

js/public/MemoryMetrics.h

@@ -586,7 +586,8 @@ struct ZoneStats
     macro(Other,   GCHeapUsed,  objectGroupsGCHeap) \
     macro(Other,   MallocHeap,  objectGroupsMallocHeap) \
     macro(Other,   MallocHeap,  typePool) \
-    macro(Other,   MallocHeap,  baselineStubsOptimized)
+    macro(Other,   MallocHeap,  baselineStubsOptimized) \
+    macro(Other,   MallocHeap,  uniqueIdMap)
 
     ZoneStats()
       : FOR_EACH_SIZE(ZERO_SIZE)

js/src/gc/Zone.h

@@ -119,6 +119,11 @@ class UniqueIdMap
     void remove(Cell* cell) {
         map.remove(Pair(cell, 0));
     }
+
+    size_t sizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const {
+        // All data allocated by |map| is contained in |alloc|.
+        return alloc.sizeOfExcludingThis(mallocSizeOf);
+    }
 };
 
 extern uint64_t NextCellUniqueId(JSRuntime* rt);
@@ -183,7 +188,8 @@ struct Zone : public JS::shadow::Zone,
 
     void addSizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf,
                                 size_t* typePool,
-                                size_t* baselineStubsOptimized);
+                                size_t* baselineStubsOptimized,
+                                size_t* uniqueIdMap);
 
     void resetGCMallocBytes();
     void setGCMaxMallocBytes(size_t value);

js/src/vm/MemoryMetrics.cpp

@@ -311,7 +311,8 @@ StatsZoneCallback(JSRuntime* rt, void* data, Zone* zone)
 
     zone->addSizeOfIncludingThis(rtStats->mallocSizeOf_,
                                  &zStats.typePool,
-                                 &zStats.baselineStubsOptimized);
+                                 &zStats.baselineStubsOptimized,
+                                 &zStats.uniqueIdMap);
 }
 
 static void

js/src/vm/TypeInference.cpp

@@ -4276,13 +4276,15 @@ TypeScript::destroy()
 void
 Zone::addSizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf,
                              size_t* typePool,
-                             size_t* baselineStubsOptimized)
+                             size_t* baselineStubsOptimized,
+                             size_t* uniqueIdMap)
 {
     *typePool += types.typeLifoAlloc.sizeOfExcludingThis(mallocSizeOf);
     if (jitZone()) {
         *baselineStubsOptimized +=
             jitZone()->optimizedStubSpace()->sizeOfExcludingThis(mallocSizeOf);
     }
+    *uniqueIdMap += uniqueIds_.sizeOfExcludingThis(mallocSizeOf);
 }
 
 TypeZone::TypeZone(Zone* zone)

js/xpconnect/src/XPCJSRuntime.cpp

@@ -1883,6 +1883,10 @@ ReportZoneStats(const JS::ZoneStats& zStats,
         zStats.unusedGCThings.totalSize(),
         "Unused GC thing cells within non-empty arenas.");
 
+    ZCREPORT_BYTES(pathPrefix + NS_LITERAL_CSTRING("unique-id-map"),
+        zStats.uniqueIdMap,
+        "Address-independent cell identities.");
+
     ZCREPORT_GC_BYTES(pathPrefix + NS_LITERAL_CSTRING("lazy-scripts/gc-heap"),
         zStats.lazyScriptsGCHeap,
         "Scripts that haven't executed yet.");