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  • Committer: Marcus Tomlinson
  • Date: 2015-11-13 07:59:04 UTC
  • Revision ID: marcus.tomlinson@canonical.com-20151113075904-h0swczmoq1rvstfc
Node v4 (stable)

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lib/v8.js
 
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// Copyright (c) 2014, StrongLoop Inc.
 
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//
 
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// Permission to use, copy, modify, and/or distribute this software for any
 
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// purpose with or without fee is hereby granted, provided that the above
 
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// copyright notice and this permission notice appear in all copies.
 
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//
 
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 
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// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 
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// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 
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// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
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'use strict';
 
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const v8binding = process.binding('v8');
 
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const heapStatisticsBuffer =
 
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    new Uint32Array(v8binding.heapStatisticsArrayBuffer);
 
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const kTotalHeapSizeIndex = v8binding.kTotalHeapSizeIndex;
 
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const kTotalHeapSizeExecutableIndex = v8binding.kTotalHeapSizeExecutableIndex;
 
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const kTotalPhysicalSizeIndex = v8binding.kTotalPhysicalSizeIndex;
 
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const kTotalAvailableSize = v8binding.kTotalAvailableSize;
 
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const kUsedHeapSizeIndex = v8binding.kUsedHeapSizeIndex;
 
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const kHeapSizeLimitIndex = v8binding.kHeapSizeLimitIndex;
 
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exports.getHeapStatistics = function() {
 
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  const buffer = heapStatisticsBuffer;
 
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  v8binding.updateHeapStatisticsArrayBuffer();
 
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  return {
 
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    'total_heap_size': buffer[kTotalHeapSizeIndex],
 
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    'total_heap_size_executable': buffer[kTotalHeapSizeExecutableIndex],
 
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    'total_physical_size': buffer[kTotalPhysicalSizeIndex],
 
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    'total_available_size': buffer[kTotalAvailableSize],
 
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    'used_heap_size': buffer[kUsedHeapSizeIndex],
 
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    'heap_size_limit': buffer[kHeapSizeLimitIndex]
 
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  };
 
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};
 
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exports.setFlagsFromString = v8binding.setFlagsFromString;