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
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
(function(global, utils, extrasUtils) {
"use strict";
%CheckIsBootstrapping();
// -----------------------------------------------------------------------
// Utils
var imports = UNDEFINED;
var exports_container = %ExportFromRuntime({});
// Export to other scripts.
function Export(f) {
f(exports_container);
}
// Import from other scripts. The actual importing happens in PostNatives so
// that we can import from scripts executed later. However, that means that
// the import is not available until the very end. If the import needs to be
// available immediately, use ImportNow.
function Import(f) {
f.next = imports;
imports = f;
}
// Import immediately from exports of previous scripts. We need this for
// functions called during bootstrapping. Hooking up imports in PostNatives
// would be too late.
function ImportNow(name) {
return exports_container[name];
}
function InstallConstants(object, constants) {
%CheckIsBootstrapping();
%OptimizeObjectForAddingMultipleProperties(object, constants.length >> 1);
var attributes = DONT_ENUM | DONT_DELETE | READ_ONLY;
for (var i = 0; i < constants.length; i += 2) {
var name = constants[i];
var k = constants[i + 1];
%AddNamedProperty(object, name, k, attributes);
}
%ToFastProperties(object);
}
// Prevents changes to the prototype of a built-in function.
// The "prototype" property of the function object is made non-configurable,
// and the prototype object is made non-extensible. The latter prevents
// changing the __proto__ property.
function SetUpLockedPrototype(
constructor, fields, methods) {
%CheckIsBootstrapping();
var prototype = constructor.prototype;
// Install functions first, because this function is used to initialize
// PropertyDescriptor itself.
var property_count = (methods.length >> 1) + (fields ? fields.length : 0);
if (property_count >= 4) {
%OptimizeObjectForAddingMultipleProperties(prototype, property_count);
}
if (fields) {
for (var i = 0; i < fields.length; i++) {
%AddNamedProperty(prototype, fields[i],
UNDEFINED, DONT_ENUM | DONT_DELETE);
}
}
for (var i = 0; i < methods.length; i += 2) {
var key = methods[i];
var f = methods[i + 1];
%AddNamedProperty(prototype, key, f, DONT_ENUM | DONT_DELETE | READ_ONLY);
%SetNativeFlag(f);
}
%InternalSetPrototype(prototype, null);
%ToFastProperties(prototype);
}
// -----------------------------------------------------------------------
// To be called by bootstrapper
function PostNatives(utils) {
%CheckIsBootstrapping();
for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
imports(exports_container);
}
exports_container = UNDEFINED;
utils.Export = UNDEFINED;
utils.Import = UNDEFINED;
utils.ImportNow = UNDEFINED;
utils.PostNatives = UNDEFINED;
}
// ----------------------------------------------------------------------------
// Object
var iteratorSymbol = ImportNow("iterator_symbol");
// ES6 7.3.9
function GetMethod(obj, p) {
var func = obj[p];
if (IS_NULL_OR_UNDEFINED(func)) return UNDEFINED;
if (IS_CALLABLE(func)) return func;
throw %make_type_error(kCalledNonCallable, typeof func);
}
// ----------------------------------------------------------------------------
// Iterator related spec functions.
// ES6 7.4.1 GetIterator(obj, method)
function GetIterator(obj, method) {
if (IS_UNDEFINED(method)) {
method = obj[iteratorSymbol];
}
if (!IS_CALLABLE(method)) {
throw %make_type_error(kNotIterable, obj);
}
var iterator = %_Call(method, obj);
if (!IS_RECEIVER(iterator)) {
throw %make_type_error(kNotAnIterator, iterator);
}
return iterator;
}
exports_container.GetIterator = GetIterator;
exports_container.GetMethod = GetMethod;
// -----------------------------------------------------------------------
%OptimizeObjectForAddingMultipleProperties(utils, 14);
utils.Import = Import;
utils.ImportNow = ImportNow;
utils.Export = Export;
utils.InstallConstants = InstallConstants;
utils.SetUpLockedPrototype = SetUpLockedPrototype;
utils.PostNatives = PostNatives;
%ToFastProperties(utils);
// -----------------------------------------------------------------------
%OptimizeObjectForAddingMultipleProperties(extrasUtils, 11);
extrasUtils.logStackTrace = function logStackTrace() {
%DebugTrace();
};
extrasUtils.log = function log() {
let message = '';
for (const arg of arguments) {
message += arg;
}
%GlobalPrint(message);
};
// Extras need the ability to store private state on their objects without
// exposing it to the outside world.
extrasUtils.createPrivateSymbol = function createPrivateSymbol(name) {
return %CreatePrivateSymbol(name);
};
// These functions are key for safe meta-programming:
// http://wiki.ecmascript.org/doku.php?id=conventions:safe_meta_programming
//
// Technically they could all be derived from combinations of
// Function.prototype.{bind,call,apply} but that introduces lots of layers of
// indirection.
extrasUtils.uncurryThis = function uncurryThis(func) {
return function(thisArg, ...args) {
return %reflect_apply(func, thisArg, args);
};
};
extrasUtils.markPromiseAsHandled = function markPromiseAsHandled(promise) {
%PromiseMarkAsHandled(promise);
};
extrasUtils.promiseState = function promiseState(promise) {
return %PromiseStatus(promise);
};
// [[PromiseState]] values (for extrasUtils.promiseState())
// These values should be kept in sync with PromiseStatus in globals.h
extrasUtils.kPROMISE_PENDING = 0;
extrasUtils.kPROMISE_FULFILLED = 1;
extrasUtils.kPROMISE_REJECTED = 2;
%ToFastProperties(extrasUtils);
})
|
