summaryrefslogtreecommitdiffstats
path: root/js/src/builtin/Utilities.js
blob: 3145b4d51c5f37ec7ab446bd9edde2d65d7aaec3 (plain)
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
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*jshint bitwise: true, camelcase: false, curly: false, eqeqeq: true,
         es5: true, forin: true, immed: true, indent: 4, latedef: false,
         newcap: false, noarg: true, noempty: true, nonew: true,
         plusplus: false, quotmark: false, regexp: true, undef: true,
         unused: false, strict: false, trailing: true,
*/

/*global ToObject: false, ToInteger: false, IsCallable: false,
         ThrowRangeError: false, ThrowTypeError: false,
         AssertionFailed: false,
         MakeConstructible: false, DecompileArg: false,
         RuntimeDefaultLocale: false,
         NewDenseArray: false,
         Dump: false,
         callFunction: false,
         TO_UINT32: false,
         JSMSG_NOT_FUNCTION: false, JSMSG_MISSING_FUN_ARG: false,
         JSMSG_EMPTY_ARRAY_REDUCE: false, JSMSG_CANT_CONVERT_TO: false,
*/

#include "SelfHostingDefines.h"

// Assertions and debug printing, defined here instead of in the header above
// to make `assert` invisible to C++.
#ifdef DEBUG
#define assert(b, info) if (!(b)) AssertionFailed(__FILE__ + ":" + __LINE__ + ": " + info)
#define dbg(msg) DumpMessage(callFunction(std_Array_pop, \
                                          StringSplitString(__FILE__, '/')) \
                             + '#' + __LINE__ + ': ' + msg)
#else
#define assert(b, info) // Elided assertion.
#define dbg(msg) // Elided debugging output.
#endif

// All C++-implemented standard builtins library functions used in self-hosted
// code are installed via the std_functions JSFunctionSpec[] in
// SelfHosting.cpp.
//
// Do not create an alias to a self-hosted builtin, otherwise it will be cloned
// twice.
//
// WeakMap is a bare constructor without properties or methods.
var std_WeakMap = WeakMap;
// StopIteration is a bare constructor without properties or methods.
var std_StopIteration = StopIteration;


/********** List specification type **********/

/* Spec: ECMAScript Language Specification, 5.1 edition, 8.8 */
function List() {
    this.length = 0;
}
MakeConstructible(List, {__proto__: null});


/********** Record specification type **********/


/* Spec: ECMAScript Internationalization API Specification, draft, 5 */
function Record() {
    return std_Object_create(null);
}
MakeConstructible(Record, {});


/********** Abstract operations defined in ECMAScript Language Specification **********/


/* Spec: ECMAScript Language Specification, 5.1 edition, 8.12.6 and 11.8.7 */
function HasProperty(o, p) {
    return p in o;
}


/* Spec: ECMAScript Language Specification, 5.1 edition, 9.2 and 11.4.9 */
function ToBoolean(v) {
    return !!v;
}


/* Spec: ECMAScript Language Specification, 5.1 edition, 9.3 and 11.4.6 */
function ToNumber(v) {
    return +v;
}


// ES6 7.2.1 (previously, ES5 9.10 under the name "CheckObjectCoercible").
function RequireObjectCoercible(v) {
    if (v === undefined || v === null)
        ThrowTypeError(JSMSG_CANT_CONVERT_TO, ToString(v), "object");
}

/* Spec: ECMAScript Draft, 6 edition May 22, 2014, 7.1.15 */
function ToLength(v) {
    v = ToInteger(v);

    if (v <= 0)
        return 0;

    // Math.pow(2, 53) - 1 = 0x1fffffffffffff
    return std_Math_min(v, 0x1fffffffffffff);
}

// ES2017 draft rev aebf014403a3e641fb1622aec47c40f051943527
// 7.2.9 SameValue ( x, y )
function SameValue(x, y) {
    if (x === y) {
        return (x !== 0) || (1 / x === 1 / y);
    }
    return (x !== x && y !== y);
}

// ES2017 draft rev aebf014403a3e641fb1622aec47c40f051943527
// 7.2.10 SameValueZero ( x, y )
function SameValueZero(x, y) {
    return x === y || (x !== x && y !== y);
}

// ES 2017 draft (April 6, 2016) 7.3.9
function GetMethod(V, P) {
    // Step 1.
    assert(IsPropertyKey(P), "Invalid property key");

    // Step 2.
    var func = V[P];

    // Step 3.
    if (func === undefined || func === null)
        return undefined;

    // Step 4.
    if (!IsCallable(func))
        ThrowTypeError(JSMSG_NOT_FUNCTION, typeof func);

    // Step 5.
    return func;
}

/* Spec: ECMAScript Draft, 6th edition Dec 24, 2014, 7.2.7 */
function IsPropertyKey(argument) {
    var type = typeof argument;
    return type === "string" || type === "symbol";
}

/* Spec: ECMAScript Draft, 6th edition Dec 24, 2014, 7.4.1 */
function GetIterator(obj, method) {
    // Steps 1-2.
    if (arguments.length === 1)
        method = GetMethod(obj, std_iterator);

    // Steps 3-4.
    var iterator = callContentFunction(method, obj);

    // Step 5.
    if (!IsObject(iterator))
        ThrowTypeError(JSMSG_NOT_ITERATOR, ToString(iterator));

    // Step 6.
    return iterator;
}

// ES2017 draft rev 7.4.6.
// When completion.[[Type]] is throw.
function IteratorCloseThrow(iter) {
    // Steps 1-2 (implicit)

    // Step 3.
    var returnMethod = GetMethod(iter, "return");

    // Step 4 (done in caller).
    if (returnMethod === undefined)
        return;

    try {
        // Step 5.
        callContentFunction(returnMethod, iter);
    } catch (e) {
    }

    // Step 6 (done in caller).

    // Steps 7-9 (skipped).
}

var _builtinCtorsCache = {__proto__: null};

function GetBuiltinConstructor(builtinName) {
    var ctor = _builtinCtorsCache[builtinName] ||
               (_builtinCtorsCache[builtinName] = GetBuiltinConstructorImpl(builtinName));
    assert(ctor, `No builtin with name "${builtinName}" found`);
    return ctor;
}

function GetBuiltinPrototype(builtinName) {
    return (_builtinCtorsCache[builtinName] || GetBuiltinConstructor(builtinName)).prototype;
}

// ES 2016 draft Mar 25, 2016 7.3.20.
function SpeciesConstructor(obj, defaultConstructor) {
    // Step 1.
    assert(IsObject(obj), "not passed an object");

    // Step 2.
    var ctor = obj.constructor;

    // Step 3.
    if (ctor === undefined)
        return defaultConstructor;

    // Step 4.
    if (!IsObject(ctor))
        ThrowTypeError(JSMSG_NOT_NONNULL_OBJECT, "object's 'constructor' property");

    // Steps 5.
    var s = ctor[std_species];

    // Step 6.
    if (s === undefined || s === null)
        return defaultConstructor;

    // Step 7.
    if (IsConstructor(s))
        return s;

    // Step 8.
    ThrowTypeError(JSMSG_NOT_CONSTRUCTOR, "@@species property of object's constructor");
}

function GetTypeError(msg) {
    try {
        FUN_APPLY(ThrowTypeError, undefined, arguments);
    } catch (e) {
        return e;
    }
    assert(false, "the catch block should've returned from this function.");
}

function GetInternalError(msg) {
    try {
        FUN_APPLY(ThrowInternalError, undefined, arguments);
    } catch (e) {
        return e;
    }
    assert(false, "the catch block should've returned from this function.");
}

// To be used when a function is required but calling it shouldn't do anything.
function NullFunction() {}

/*************************************** Testing functions ***************************************/
function outer() {
    return function inner() {
        return "foo";
    }
}