wrappingS-ECMA-ARRAY.js File Reference

Wrappers for arrays from the ECMA standard library. More...

Functions
function	packIEEE754 (v, ebits, fbits)
function	unpackIEEE754 (bytes, ebits, fbits)
function	unpackF64 (b)
function	packF64 (v)
function	unpackF32 (b)
function	packF32 (v)
function	constructDecorator (wrapped)
function	offsetDecorator (wrapped, type, proxyRef, offsetF)
function	redefineNewArrayFunctions (target, offsetF)
function	redefineNewArrayConstructors (target)
function	getByteDecorator (wrapped, offsetF, name, doMapping)
function	setByteDecorator (wrapped, offsetF, name, doMapping)
function	getFloatDecorator (wrapped, name, doMapping)
function	setFloatDecorator (wrapped, name, doMapping)
function	getBigIntDecorator (wrapped, doMapping)
function	setBigIntDecorator (wrapped, doMapping)
function	redefineDataViewFunctions (target, offsetF, doMapping)
function	if (typeof target==='object' &&target !==null)
	if (doMapping)
	for (let i=0;i< _data['length'];i++)
	for (let p of typedTypes)
	add_wrappers (wrappers)

Variables
var	proxyHandler
	Default proxy handler for Typed Arrays. More...
	_data = new originalF(...arguments)
var	offsetF
var	proxy = new newProxy(_data, ${proxyHandler})
let	j
var	wrappers
let	DEFAULT_TYPED_ARRAY_WRAPPER
var	typedTypes = ['Uint8Array', 'Int8Array', 'Uint8ClampedArray', 'Int16Array', 'Uint16Array', 'Int32Array', 'Uint32Array', 'Float32Array', 'Float64Array']

Detailed Description

Wrappers for arrays from the ECMA standard library.

Author

Copyright (C) 2020 Peter Hornak

License:

SPDX-License-Identifier: GPL-3.0-or-later

This wrapper aims on prevention of microarchitectural attacks like Meltdown and Spectre. This code was originally a part of https://github.com/IAIK/ChromeZero.

Bug:

subarray() method always ruturns the full array.

The wrappers support the following behaviour:

• Offset: The content of the buffer is shifted by a fix offset. This is a faster method but can be removed.
• Random mapping: All items are mapped randomly. This is a slower method but more reliable.

See also

https://www.fit.vut.cz/study/thesis/22374/?year=0&sup=Pol%C4%8D%C3%A1k, especially Sect. 5.1

Function Documentation

add_wrappers()

add_wrappers

(

wrappers

wrappers

)

Adds a list of wrapping objects to the build_wrapping_code.

This function is called from each wrapper in its file.

constructDecorator()

function constructDecorator

(

wrapped

)

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for() [1/2]

for

(

)

for() [2/2]

for

(

let p of

typedTypes

)

getBigIntDecorator()

function getBigIntDecorator	(		wrapped,
			doMapping
	)

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getByteDecorator()

function getByteDecorator	(		wrapped,
			offsetF,
			name,
			doMapping
	)

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getFloatDecorator()

function getFloatDecorator	(		wrapped,
			name,
			doMapping
	)

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if() [1/2]

if

(

doMapping

)

if() [2/2]

function if

(

typeof

target = == 'object' && target !== null

)

offsetDecorator()

function offsetDecorator	(		wrapped,
			type,
			proxyRef,
			offsetF
	)

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packF32()

function packF32

(

v

)

See also

Function was adopted from https://github.com/inexorabletash/polyfill/blob/master/typedarray.js under MIT licence.

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packF64()

function packF64

(

v

)

See also

Function was adopted from https://github.com/inexorabletash/polyfill/blob/master/typedarray.js under MIT licence.

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packIEEE754()

function packIEEE754	(		v,
			ebits,
			fbits
	)

See also

This function was adopted from https://github.com/inexorabletash/polyfill/blob/master/typedarray.js under MIT licence.

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redefineDataViewFunctions()

function redefineDataViewFunctions	(		target,
			offsetF,
			doMapping
	)

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redefineNewArrayConstructors()

function redefineNewArrayConstructors

(

target

)

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redefineNewArrayFunctions()

function redefineNewArrayFunctions	(		target,
			offsetF
	)

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setBigIntDecorator()

function setBigIntDecorator	(		wrapped,
			doMapping
	)

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setByteDecorator()

function setByteDecorator	(		wrapped,
			offsetF,
			name,
			doMapping
	)

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setFloatDecorator()

function setFloatDecorator	(		wrapped,
			name,
			doMapping
	)

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unpackF32()

function unpackF32

(

b

)

See also

Function was adopted from https://github.com/inexorabletash/polyfill/blob/master/typedarray.js under MIT licence.

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unpackF64()

function unpackF64

(

b

)

See also

Function was adopted from https://github.com/inexorabletash/polyfill/blob/master/typedarray.js under MIT licence.

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unpackIEEE754()

function unpackIEEE754	(		bytes,
			ebits,
			fbits
	)

See also

This function was adopted from https://github.com/inexorabletash/polyfill/blob/master/typedarray.js under MIT licence.

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Variable Documentation

_data

_data = new originalF(...arguments)

DEFAULT_TYPED_ARRAY_WRAPPER

let DEFAULT_TYPED_ARRAY_WRAPPER

j

let j

offsetF

var offsetF

Initial value:

= function(x) {
    return x;
  }

proxy

return proxy = new newProxy(_data, ${proxyHandler})

proxyHandler

var proxyHandler

Initial value:

= `{
  get(target, key, receiver) {
    var random_idx = Math.floor(Math.random() * target['length']);
    
    var rand_val = target[random_idx];
    
    
    if (typeof key !== 'symbol' && Number(key) >= 0 && Number(key) < target.length) {
      key = offsetF(key)
    }
    let value = target[key]
    return typeof value == 'function' ? value.bind(target) : value;
  },
  set(target, key, value) {
    var random_idx = Math.floor(Math.random() * (target['length']));
    
    var rand_val = target[random_idx];
    rand_val = rand_val;
    if (typeof key !== 'symbol' && Number(key) >= 0 && Number(key) < target.length) {
      key = offsetF(key)
    }
    return target[key] = value;
  }
}`

Default proxy handler for Typed Arrays.

typedTypes

var typedTypes = ['Uint8Array', 'Int8Array', 'Uint8ClampedArray', 'Int16Array', 'Uint16Array', 'Int32Array', 'Uint32Array', 'Float32Array', 'Float64Array']

wrappers

var wrappers