src: add total_available_size to v8 statistics

v8 introduced the new flag `total_available_size` in version 4.4
and upwards. This flag is now available on `v8.getHeapStatistics`
with the name `total_available_size`. It contains the total
available heap size of v8.

Introduced with commit: v8/v8-git-mirror@0a1352a7

PR-URL: https://github.com/nodejs/io.js/pull/2348
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/v8.js b/lib/v8.js
index f25814bab..acadfa64e 100644
--- a/lib/v8.js
+++ b/lib/v8.js
@@ -22,6 +22,7 @@ const heapStatisticsBuffer =
 const kTotalHeapSizeIndex = v8binding.kTotalHeapSizeIndex;
 const kTotalHeapSizeExecutableIndex = v8binding.kTotalHeapSizeExecutableIndex;
 const kTotalPhysicalSizeIndex = v8binding.kTotalPhysicalSizeIndex;
+const kTotalAvailableSize = v8binding.kTotalAvailableSize;
 const kUsedHeapSizeIndex = v8binding.kUsedHeapSizeIndex;
 const kHeapSizeLimitIndex = v8binding.kHeapSizeLimitIndex;
 
@@ -34,6 +35,7 @@ exports.getHeapStatistics = function() {
     'total_heap_size': buffer[kTotalHeapSizeIndex],
     'total_heap_size_executable': buffer[kTotalHeapSizeExecutableIndex],
     'total_physical_size': buffer[kTotalPhysicalSizeIndex],
+    'total_available_size': buffer[kTotalAvailableSize],
     'used_heap_size': buffer[kUsedHeapSizeIndex],
     'heap_size_limit': buffer[kHeapSizeLimitIndex]
   };