1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
'use strict';
/* eslint-disable no-restricted-globals */
// This file subclasses and stores the JS builtins that come from the VM
// so that Node.js's builtin modules do not need to later look these up from
// the global proxy, which can be mutated by users.
// TODO(joyeecheung): we can restrict access to these globals in builtin
// modules through the JS linter, for example: ban access such as `Object`
// (which falls back to a lookup in the global proxy) in favor of
// `primordials.Object` where `primordials` is a lexical variable passed
// by the native module compiler.
const ReflectApply = Reflect.apply;
// This function is borrowed from the function with the same name on V8 Extras'
// `utils` object. V8 implements Reflect.apply very efficiently in conjunction
// with the spread syntax, such that no additional special case is needed for
// function calls w/o arguments.
// Refs: https://github.com/v8/v8/blob/d6ead37d265d7215cf9c5f768f279e21bd170212/src/js/prologue.js#L152-L156
function uncurryThis(func) {
return (thisArg, ...args) => ReflectApply(func, thisArg, args);
}
primordials.uncurryThis = uncurryThis;
function copyProps(src, dest) {
for (const key of Reflect.ownKeys(src)) {
if (!Reflect.getOwnPropertyDescriptor(dest, key)) {
Reflect.defineProperty(
dest,
key,
Reflect.getOwnPropertyDescriptor(src, key));
}
}
}
function copyPropsRenamed(src, dest, prefix) {
for (const key of Reflect.ownKeys(src)) {
if (typeof key === 'string') {
Reflect.defineProperty(
dest,
`${prefix}${key[0].toUpperCase()}${key.slice(1)}`,
Reflect.getOwnPropertyDescriptor(src, key));
}
}
}
function copyPrototype(src, dest, prefix) {
for (const key of Reflect.ownKeys(src)) {
if (typeof key === 'string') {
const desc = Reflect.getOwnPropertyDescriptor(src, key);
if (typeof desc.value === 'function') {
desc.value = uncurryThis(desc.value);
}
Reflect.defineProperty(
dest,
`${prefix}${key[0].toUpperCase()}${key.slice(1)}`,
desc);
}
}
}
function makeSafe(unsafe, safe) {
copyProps(unsafe.prototype, safe.prototype);
copyProps(unsafe, safe);
Object.setPrototypeOf(safe.prototype, null);
Object.freeze(safe.prototype);
Object.freeze(safe);
return safe;
}
// Subclass the constructors because we need to use their prototype
// methods later.
primordials.SafeMap = makeSafe(
Map,
class SafeMap extends Map {}
);
primordials.SafeWeakMap = makeSafe(
WeakMap,
class SafeWeakMap extends WeakMap {}
);
primordials.SafeSet = makeSafe(
Set,
class SafeSet extends Set {}
);
primordials.SafePromise = makeSafe(
Promise,
class SafePromise extends Promise {}
);
// Create copies of the namespace objects
[
'JSON',
'Math',
'Reflect'
].forEach((name) => {
copyPropsRenamed(global[name], primordials, name);
});
// Create copies of intrinsic objects
[
'Array',
'ArrayBuffer',
'BigInt',
'Boolean',
'Date',
'Error',
'Function',
'Map',
'Number',
'Object',
'RegExp',
'Set',
'String',
'Symbol',
'WeakMap',
'WeakSet',
].forEach((name) => {
const original = global[name];
primordials[name] = original;
copyPropsRenamed(original, primordials, name);
copyPrototype(original.prototype, primordials, `${name}Prototype`);
});
Object.setPrototypeOf(primordials, null);
Object.freeze(primordials);
|
