src: extend `HeapStatistics` with new fields

src: Add does_zap_garbage, malloced_memory and
peak_malloced_memory to v8 HeapStatistics

Following https://github.com/nodejs/code-and-learn/issues/56 I
have exposed does_zap_garbage to HeapStatistics.
The other fields, malloced_memory and peak_malloced_memory don't
seem to be in the current version of v8 in master.

PR-URL: https://github.com/nodejs/node/pull/8610
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

1 files changed, 7 insertions, 1 deletions

diff --git a/lib/v8.js b/lib/v8.js
index e78a2480ff..90abc627a4 100644
--- a/lib/v8.js
+++ b/lib/v8.js
@@ -25,6 +25,9 @@ const kTotalPhysicalSizeIndex = v8binding.kTotalPhysicalSizeIndex;
 const kTotalAvailableSize = v8binding.kTotalAvailableSize;
 const kUsedHeapSizeIndex = v8binding.kUsedHeapSizeIndex;
 const kHeapSizeLimitIndex = v8binding.kHeapSizeLimitIndex;
+const kDoesZapGarbageIndex = v8binding.kDoesZapGarbageIndex;
+const kMallocedMemoryIndex = v8binding.kMallocedMemoryIndex;
+const kPeakMallocedMemoryIndex = v8binding.kPeakMallocedMemoryIndex;
 
 // Properties for heap space statistics buffer extraction.
 const heapSpaceStatisticsBuffer =
@@ -49,7 +52,10 @@ exports.getHeapStatistics = function() {
     'total_physical_size': buffer[kTotalPhysicalSizeIndex],
     'total_available_size': buffer[kTotalAvailableSize],
     'used_heap_size': buffer[kUsedHeapSizeIndex],
-    'heap_size_limit': buffer[kHeapSizeLimitIndex]
+    'heap_size_limit': buffer[kHeapSizeLimitIndex],
+    'malloced_memory': buffer[kMallocedMemoryIndex],
+    'peak_malloced_memory': buffer[kPeakMallocedMemoryIndex],
+    'does_zap_garbage': buffer[kDoesZapGarbageIndex]
   };
 };