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// Copyright (c) 2014, StrongLoop Inc.
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
'use strict';
const Buffer = require('buffer').Buffer;
const v8binding = process.binding('v8');
const serdesBinding = process.binding('serdes');
const bufferBinding = process.binding('buffer');
const { objectToString } = require('internal/util');
const { FastBuffer } = require('internal/buffer');
// Properties for heap statistics buffer extraction.
const heapStatisticsBuffer =
new Float64Array(v8binding.heapStatisticsArrayBuffer);
const kTotalHeapSizeIndex = v8binding.kTotalHeapSizeIndex;
const kTotalHeapSizeExecutableIndex = v8binding.kTotalHeapSizeExecutableIndex;
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 =
new Float64Array(v8binding.heapSpaceStatisticsArrayBuffer);
const kHeapSpaces = v8binding.kHeapSpaces;
const kNumberOfHeapSpaces = kHeapSpaces.length;
const kHeapSpaceStatisticsPropertiesCount =
v8binding.kHeapSpaceStatisticsPropertiesCount;
const kSpaceSizeIndex = v8binding.kSpaceSizeIndex;
const kSpaceUsedSizeIndex = v8binding.kSpaceUsedSizeIndex;
const kSpaceAvailableSizeIndex = v8binding.kSpaceAvailableSizeIndex;
const kPhysicalSpaceSizeIndex = v8binding.kPhysicalSpaceSizeIndex;
exports.getHeapStatistics = function() {
const buffer = heapStatisticsBuffer;
v8binding.updateHeapStatisticsArrayBuffer();
return {
'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],
'malloced_memory': buffer[kMallocedMemoryIndex],
'peak_malloced_memory': buffer[kPeakMallocedMemoryIndex],
'does_zap_garbage': buffer[kDoesZapGarbageIndex]
};
};
exports.cachedDataVersionTag = v8binding.cachedDataVersionTag;
exports.setFlagsFromString = v8binding.setFlagsFromString;
exports.getHeapSpaceStatistics = function() {
const heapSpaceStatistics = new Array(kNumberOfHeapSpaces);
const buffer = heapSpaceStatisticsBuffer;
v8binding.updateHeapSpaceStatisticsArrayBuffer();
for (var i = 0; i < kNumberOfHeapSpaces; i++) {
const propertyOffset = i * kHeapSpaceStatisticsPropertiesCount;
heapSpaceStatistics[i] = {
space_name: kHeapSpaces[i],
space_size: buffer[propertyOffset + kSpaceSizeIndex],
space_used_size: buffer[propertyOffset + kSpaceUsedSizeIndex],
space_available_size: buffer[propertyOffset + kSpaceAvailableSizeIndex],
physical_space_size: buffer[propertyOffset + kPhysicalSpaceSizeIndex]
};
}
return heapSpaceStatistics;
};
/* V8 serialization API */
const Serializer = exports.Serializer = serdesBinding.Serializer;
const Deserializer = exports.Deserializer = serdesBinding.Deserializer;
/* JS methods for the base objects */
Serializer.prototype._getDataCloneError = Error;
Deserializer.prototype.readRawBytes = function(length) {
const offset = this._readRawBytes(length);
// `this.buffer` can be a Buffer or a plain Uint8Array, so just calling
// `.slice()` doesn't work.
return new FastBuffer(this.buffer.buffer,
this.buffer.byteOffset + offset,
length);
};
/* Keep track of how to handle different ArrayBufferViews.
* The default Serializer for Node does not use the V8 methods for serializing
* those objects because Node's `Buffer` objects use pooled allocation in many
* cases, and their underlying `ArrayBuffer`s would show up in the
* serialization. Because a) those may contain sensitive data and the user
* may not be aware of that and b) they are often much larger than the `Buffer`
* itself, custom serialization is applied. */
const arrayBufferViewTypes = [Int8Array, Uint8Array, Uint8ClampedArray,
Int16Array, Uint16Array, Int32Array, Uint32Array,
Float32Array, Float64Array, DataView];
const arrayBufferViewTypeToIndex = new Map();
{
const dummy = new ArrayBuffer();
for (const [i, ctor] of arrayBufferViewTypes.entries()) {
const tag = objectToString(new ctor(dummy));
arrayBufferViewTypeToIndex.set(tag, i);
}
}
const bufferConstructorIndex = arrayBufferViewTypes.push(Buffer) - 1;
class DefaultSerializer extends Serializer {
constructor() {
super();
this._setTreatArrayBufferViewsAsHostObjects(true);
}
_writeHostObject(abView) {
let i = 0;
if (abView.constructor === Buffer) {
i = bufferConstructorIndex;
} else {
const tag = objectToString(abView);
i = arrayBufferViewTypeToIndex.get(tag);
if (i === undefined) {
throw this._getDataCloneError(`Unknown host object type: ${tag}`);
}
}
this.writeUint32(i);
this.writeUint32(abView.byteLength);
this.writeRawBytes(new Uint8Array(abView.buffer,
abView.byteOffset,
abView.byteLength));
}
}
exports.DefaultSerializer = DefaultSerializer;
class DefaultDeserializer extends Deserializer {
constructor(buffer) {
super(buffer);
}
_readHostObject() {
const typeIndex = this.readUint32();
const ctor = arrayBufferViewTypes[typeIndex];
const byteLength = this.readUint32();
const byteOffset = this._readRawBytes(byteLength);
const BYTES_PER_ELEMENT = ctor.BYTES_PER_ELEMENT || 1;
const offset = this.buffer.byteOffset + byteOffset;
if (offset % BYTES_PER_ELEMENT === 0) {
return new ctor(this.buffer.buffer,
offset,
byteLength / BYTES_PER_ELEMENT);
} else {
// Copy to an aligned buffer first.
const copy = Buffer.allocUnsafe(byteLength);
bufferBinding.copy(this.buffer, copy, 0, offset, offset + byteLength);
return new ctor(copy.buffer,
copy.byteOffset,
byteLength / BYTES_PER_ELEMENT);
}
}
}
exports.DefaultDeserializer = DefaultDeserializer;
exports.serialize = function serialize(value) {
const ser = new DefaultSerializer();
ser.writeHeader();
ser.writeValue(value);
return ser.releaseBuffer();
};
exports.deserialize = function deserialize(buffer) {
const der = new DefaultDeserializer(buffer);
der.readHeader();
return der.readValue();
};
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