• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1// Copyright 2006-2008 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5// This files contains runtime support implemented in JavaScript.
6
7// CAUTION: Some of the functions specified in this file are called
8// directly from compiled code. These are the functions with names in
9// ALL CAPS. The compiled code passes the first argument in 'this'.
10
11
12// The following declarations are shared with other native JS files.
13// They are all declared at this one spot to avoid redeclaration errors.
14
15(function(global, utils) {
16
17%CheckIsBootstrapping();
18
19var GlobalArray = global.Array;
20var GlobalBoolean = global.Boolean;
21var GlobalString = global.String;
22var MakeRangeError;
23var MakeTypeError;
24var speciesSymbol;
25
26utils.Import(function(from) {
27  MakeRangeError = from.MakeRangeError;
28  MakeTypeError = from.MakeTypeError;
29  speciesSymbol = from.species_symbol;
30});
31
32// ----------------------------------------------------------------------------
33
34
35/* ---------------------------------
36   - - -   U t i l i t i e s   - - -
37   ---------------------------------
38*/
39
40
41function ToPositiveInteger(x, rangeErrorIndex) {
42  var i = TO_INTEGER(x) + 0;
43  if (i < 0) throw MakeRangeError(rangeErrorIndex);
44  return i;
45}
46
47
48function MaxSimple(a, b) {
49  return a > b ? a : b;
50}
51
52
53function MinSimple(a, b) {
54  return a > b ? b : a;
55}
56
57
58%SetForceInlineFlag(MaxSimple);
59%SetForceInlineFlag(MinSimple);
60
61
62// ES2015 7.3.20
63function SpeciesConstructor(object, defaultConstructor) {
64  var constructor = object.constructor;
65  if (IS_UNDEFINED(constructor)) {
66    return defaultConstructor;
67  }
68  if (!IS_RECEIVER(constructor)) {
69    throw MakeTypeError(kConstructorNotReceiver);
70  }
71  var species = constructor[speciesSymbol];
72  if (IS_NULL_OR_UNDEFINED(species)) {
73    return defaultConstructor;
74  }
75  if (%IsConstructor(species)) {
76    return species;
77  }
78  throw MakeTypeError(kSpeciesNotConstructor);
79}
80
81//----------------------------------------------------------------------------
82
83// NOTE: Setting the prototype for Array must take place as early as
84// possible due to code generation for array literals.  When
85// generating code for a array literal a boilerplate array is created
86// that is cloned when running the code.  It is essential that the
87// boilerplate gets the right prototype.
88%FunctionSetPrototype(GlobalArray, new GlobalArray(0));
89
90// ----------------------------------------------------------------------------
91// Exports
92
93utils.Export(function(to) {
94  to.MaxSimple = MaxSimple;
95  to.MinSimple = MinSimple;
96  to.ToPositiveInteger = ToPositiveInteger;
97  to.SpeciesConstructor = SpeciesConstructor;
98});
99
100})
101