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70beef97bd
Adds `v8.cachedDataVersionTag()`, which returns an integer representing the version tag for `cachedData` for the current V8 version & flags. PR-URL: https://github.com/nodejs/node/pull/11515 Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
83 lines
3.5 KiB
JavaScript
83 lines
3.5 KiB
JavaScript
// 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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// Properties for heap statistics buffer extraction.
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const heapStatisticsBuffer =
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new Float64Array(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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const kDoesZapGarbageIndex = v8binding.kDoesZapGarbageIndex;
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const kMallocedMemoryIndex = v8binding.kMallocedMemoryIndex;
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const kPeakMallocedMemoryIndex = v8binding.kPeakMallocedMemoryIndex;
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// Properties for heap space statistics buffer extraction.
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const heapSpaceStatisticsBuffer =
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new Float64Array(v8binding.heapSpaceStatisticsArrayBuffer);
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const kHeapSpaces = v8binding.kHeapSpaces;
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const kNumberOfHeapSpaces = kHeapSpaces.length;
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const kHeapSpaceStatisticsPropertiesCount =
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v8binding.kHeapSpaceStatisticsPropertiesCount;
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const kSpaceSizeIndex = v8binding.kSpaceSizeIndex;
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const kSpaceUsedSizeIndex = v8binding.kSpaceUsedSizeIndex;
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const kSpaceAvailableSizeIndex = v8binding.kSpaceAvailableSizeIndex;
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const kPhysicalSpaceSizeIndex = v8binding.kPhysicalSpaceSizeIndex;
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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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'malloced_memory': buffer[kMallocedMemoryIndex],
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'peak_malloced_memory': buffer[kPeakMallocedMemoryIndex],
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'does_zap_garbage': buffer[kDoesZapGarbageIndex]
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};
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};
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exports.cachedDataVersionTag = v8binding.cachedDataVersionTag;
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exports.setFlagsFromString = v8binding.setFlagsFromString;
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exports.getHeapSpaceStatistics = function() {
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const heapSpaceStatistics = new Array(kNumberOfHeapSpaces);
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const buffer = heapSpaceStatisticsBuffer;
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v8binding.updateHeapSpaceStatisticsArrayBuffer();
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for (var i = 0; i < kNumberOfHeapSpaces; i++) {
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const propertyOffset = i * kHeapSpaceStatisticsPropertiesCount;
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heapSpaceStatistics[i] = {
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space_name: kHeapSpaces[i],
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space_size: buffer[propertyOffset + kSpaceSizeIndex],
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space_used_size: buffer[propertyOffset + kSpaceUsedSizeIndex],
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space_available_size: buffer[propertyOffset + kSpaceAvailableSizeIndex],
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physical_space_size: buffer[propertyOffset + kPhysicalSpaceSizeIndex]
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};
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}
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return heapSpaceStatistics;
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};
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