summaryrefslogtreecommitdiffstats
path: root/js/src/builtin/Boolean.cpp
blob: 7806362d134e36f0f21a3bef91df260a6c150787 (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
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: set ts=8 sts=2 et sw=2 tw=80:
 * 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/. */

/*
 * JS boolean implementation.
 */

#include "builtin/Boolean-inl.h"

#include "jstypes.h"

#include "jit/InlinableNatives.h"
#include "js/PropertySpec.h"
#include "util/StringBuffer.h"
#include "vm/BigIntType.h"
#include "vm/GlobalObject.h"
#include "vm/JSContext.h"
#include "vm/JSObject.h"

#include "vm/BooleanObject-inl.h"

using namespace js;

const JSClass BooleanObject::class_ = {
    "Boolean",
    JSCLASS_HAS_RESERVED_SLOTS(1) | JSCLASS_HAS_CACHED_PROTO(JSProto_Boolean),
    JS_NULL_CLASS_OPS, &BooleanObject::classSpec_};

MOZ_ALWAYS_INLINE bool IsBoolean(HandleValue v) {
  return v.isBoolean() || (v.isObject() && v.toObject().is<BooleanObject>());
}

// ES2020 draft rev ecb4178012d6b4d9abc13fcbd45f5c6394b832ce
// 19.4.3 Properties of the Boolean Prototype Object,  thisBooleanValue.
static MOZ_ALWAYS_INLINE bool ThisBooleanValue(HandleValue val) {
  // Step 3, the error case, is handled by CallNonGenericMethod.
  MOZ_ASSERT(IsBoolean(val));

  // Step 1.
  if (val.isBoolean()) {
    return val.toBoolean();
  }

  // Step 2.
  return val.toObject().as<BooleanObject>().unbox();
}

MOZ_ALWAYS_INLINE bool bool_toSource_impl(JSContext* cx, const CallArgs& args) {
  bool b = ThisBooleanValue(args.thisv());

  JSStringBuilder sb(cx);
  if (!sb.append("(new Boolean(") || !BooleanToStringBuffer(b, sb) ||
      !sb.append("))")) {
    return false;
  }

  JSString* str = sb.finishString();
  if (!str) {
    return false;
  }
  args.rval().setString(str);
  return true;
}

static bool bool_toSource(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsBoolean, bool_toSource_impl>(cx, args);
}

// ES2020 draft rev ecb4178012d6b4d9abc13fcbd45f5c6394b832ce
// 19.3.3.2 Boolean.prototype.toString ( )
MOZ_ALWAYS_INLINE bool bool_toString_impl(JSContext* cx, const CallArgs& args) {
  // Step 1.
  bool b = ThisBooleanValue(args.thisv());

  // Step 2.
  args.rval().setString(BooleanToString(cx, b));
  return true;
}

static bool bool_toString(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsBoolean, bool_toString_impl>(cx, args);
}

// ES2020 draft rev ecb4178012d6b4d9abc13fcbd45f5c6394b832ce
// 19.3.3.3 Boolean.prototype.valueOf ( )
MOZ_ALWAYS_INLINE bool bool_valueOf_impl(JSContext* cx, const CallArgs& args) {
  // Step 1.
  args.rval().setBoolean(ThisBooleanValue(args.thisv()));
  return true;
}

static bool bool_valueOf(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsBoolean, bool_valueOf_impl>(cx, args);
}

static const JSFunctionSpec boolean_methods[] = {
    JS_FN("toSource", bool_toSource, 0, 0),
    JS_FN("toString", bool_toString, 0, 0),
    JS_FN("valueOf", bool_valueOf, 0, 0), JS_FS_END};

// ES2020 draft rev ecb4178012d6b4d9abc13fcbd45f5c6394b832ce
// 19.3.1.1 Boolean ( value )
static bool Boolean(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);

  // Step 1.
  bool b = args.length() != 0 ? JS::ToBoolean(args[0]) : false;

  if (args.isConstructing()) {
    // Steps 3-4.
    RootedObject proto(cx);
    if (!GetPrototypeFromBuiltinConstructor(cx, args, JSProto_Boolean,
                                            &proto)) {
      return false;
    }

    JSObject* obj = BooleanObject::create(cx, b, proto);
    if (!obj) {
      return false;
    }

    // Step 5.
    args.rval().setObject(*obj);
  } else {
    // Step 2.
    args.rval().setBoolean(b);
  }
  return true;
}

JSObject* BooleanObject::createPrototype(JSContext* cx, JSProtoKey key) {
  BooleanObject* booleanProto =
      GlobalObject::createBlankPrototype<BooleanObject>(cx, cx->global());
  if (!booleanProto) {
    return nullptr;
  }
  booleanProto->setFixedSlot(BooleanObject::PRIMITIVE_VALUE_SLOT,
                             BooleanValue(false));
  return booleanProto;
}

const ClassSpec BooleanObject::classSpec_ = {
    GenericCreateConstructor<Boolean, 1, gc::AllocKind::FUNCTION,
                             &jit::JitInfo_Boolean>,
    BooleanObject::createPrototype,
    nullptr,
    nullptr,
    boolean_methods,
    nullptr};

PropertyName* js::BooleanToString(JSContext* cx, bool b) {
  return b ? cx->names().true_ : cx->names().false_;
}

JS_PUBLIC_API bool js::ToBooleanSlow(HandleValue v) {
  if (v.isString()) {
    return v.toString()->length() != 0;
  }
  if (v.isBigInt()) {
    return !v.toBigInt()->isZero();
  }
#ifdef ENABLE_RECORD_TUPLE
  // proposal-record-tuple Section 3.1.1
  if (v.isExtendedPrimitive()) {
    return true;
  }
#endif

  MOZ_ASSERT(v.isObject());
  return !EmulatesUndefined(&v.toObject());
}