1// Copyright 2013 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28"use strict";
29
30// This file relies on the fact that the following declarations have been made
31// in runtime.js:
32// var $Function = global.Function;
33
34// ----------------------------------------------------------------------------
35
36
37// Generator functions and objects are specified by ES6, sections 15.19.3 and
38// 15.19.4.
39
40function GeneratorObjectNext(value) {
41  if (!IS_GENERATOR(this)) {
42    throw MakeTypeError('incompatible_method_receiver',
43                        ['[Generator].prototype.next', this]);
44  }
45
46  return %_GeneratorNext(this, value);
47}
48
49function GeneratorObjectThrow(exn) {
50  if (!IS_GENERATOR(this)) {
51    throw MakeTypeError('incompatible_method_receiver',
52                        ['[Generator].prototype.throw', this]);
53  }
54
55  return %_GeneratorThrow(this, exn);
56}
57
58function GeneratorFunctionPrototypeConstructor(x) {
59  if (%_IsConstructCall()) {
60    throw MakeTypeError('not_constructor', ['GeneratorFunctionPrototype']);
61  }
62}
63
64function GeneratorFunctionConstructor(arg1) {  // length == 1
65  var source = NewFunctionString(arguments, 'function*');
66  var global_receiver = %GlobalReceiver(global);
67  // Compile the string in the constructor and not a helper so that errors
68  // appear to come from here.
69  var f = %_CallFunction(global_receiver, %CompileString(source, true));
70  %FunctionMarkNameShouldPrintAsAnonymous(f);
71  return f;
72}
73
74
75function SetUpGenerators() {
76  %CheckIsBootstrapping();
77  var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype;
78  InstallFunctions(GeneratorObjectPrototype,
79                   DONT_ENUM | DONT_DELETE | READ_ONLY,
80                   ["next", GeneratorObjectNext,
81                    "throw", GeneratorObjectThrow]);
82  %SetProperty(GeneratorObjectPrototype, "constructor",
83               GeneratorFunctionPrototype, DONT_ENUM | DONT_DELETE | READ_ONLY);
84  %SetPrototype(GeneratorFunctionPrototype, $Function.prototype);
85  %SetCode(GeneratorFunctionPrototype, GeneratorFunctionPrototypeConstructor);
86  %SetProperty(GeneratorFunctionPrototype, "constructor",
87               GeneratorFunction, DONT_ENUM | DONT_DELETE | READ_ONLY);
88  %SetPrototype(GeneratorFunction, $Function);
89  %SetCode(GeneratorFunction, GeneratorFunctionConstructor);
90}
91
92SetUpGenerators();
93