1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/jsbool.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,204 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +/*
1.11 + * JS boolean implementation.
1.12 + */
1.13 +
1.14 +#include "jsboolinlines.h"
1.15 +
1.16 +#include "jsapi.h"
1.17 +#include "jsatom.h"
1.18 +#include "jscntxt.h"
1.19 +#include "jsobj.h"
1.20 +#include "jstypes.h"
1.21 +
1.22 +#include "vm/GlobalObject.h"
1.23 +#include "vm/ProxyObject.h"
1.24 +#include "vm/StringBuffer.h"
1.25 +
1.26 +#include "vm/BooleanObject-inl.h"
1.27 +
1.28 +using namespace js;
1.29 +using namespace js::types;
1.30 +
1.31 +const Class BooleanObject::class_ = {
1.32 + "Boolean",
1.33 + JSCLASS_HAS_RESERVED_SLOTS(1) | JSCLASS_HAS_CACHED_PROTO(JSProto_Boolean),
1.34 + JS_PropertyStub, /* addProperty */
1.35 + JS_DeletePropertyStub, /* delProperty */
1.36 + JS_PropertyStub, /* getProperty */
1.37 + JS_StrictPropertyStub, /* setProperty */
1.38 + JS_EnumerateStub,
1.39 + JS_ResolveStub,
1.40 + JS_ConvertStub
1.41 +};
1.42 +
1.43 +MOZ_ALWAYS_INLINE bool
1.44 +IsBoolean(HandleValue v)
1.45 +{
1.46 + return v.isBoolean() || (v.isObject() && v.toObject().is<BooleanObject>());
1.47 +}
1.48 +
1.49 +#if JS_HAS_TOSOURCE
1.50 +MOZ_ALWAYS_INLINE bool
1.51 +bool_toSource_impl(JSContext *cx, CallArgs args)
1.52 +{
1.53 + HandleValue thisv = args.thisv();
1.54 + JS_ASSERT(IsBoolean(thisv));
1.55 +
1.56 + bool b = thisv.isBoolean() ? thisv.toBoolean() : thisv.toObject().as<BooleanObject>().unbox();
1.57 +
1.58 + StringBuffer sb(cx);
1.59 + if (!sb.append("(new Boolean(") || !BooleanToStringBuffer(b, sb) || !sb.append("))"))
1.60 + return false;
1.61 +
1.62 + JSString *str = sb.finishString();
1.63 + if (!str)
1.64 + return false;
1.65 + args.rval().setString(str);
1.66 + return true;
1.67 +}
1.68 +
1.69 +static bool
1.70 +bool_toSource(JSContext *cx, unsigned argc, Value *vp)
1.71 +{
1.72 + CallArgs args = CallArgsFromVp(argc, vp);
1.73 + return CallNonGenericMethod<IsBoolean, bool_toSource_impl>(cx, args);
1.74 +}
1.75 +#endif
1.76 +
1.77 +MOZ_ALWAYS_INLINE bool
1.78 +bool_toString_impl(JSContext *cx, CallArgs args)
1.79 +{
1.80 + HandleValue thisv = args.thisv();
1.81 + JS_ASSERT(IsBoolean(thisv));
1.82 +
1.83 + bool b = thisv.isBoolean() ? thisv.toBoolean() : thisv.toObject().as<BooleanObject>().unbox();
1.84 + args.rval().setString(js_BooleanToString(cx, b));
1.85 + return true;
1.86 +}
1.87 +
1.88 +static bool
1.89 +bool_toString(JSContext *cx, unsigned argc, Value *vp)
1.90 +{
1.91 + CallArgs args = CallArgsFromVp(argc, vp);
1.92 + return CallNonGenericMethod<IsBoolean, bool_toString_impl>(cx, args);
1.93 +}
1.94 +
1.95 +MOZ_ALWAYS_INLINE bool
1.96 +bool_valueOf_impl(JSContext *cx, CallArgs args)
1.97 +{
1.98 + HandleValue thisv = args.thisv();
1.99 + JS_ASSERT(IsBoolean(thisv));
1.100 +
1.101 + bool b = thisv.isBoolean() ? thisv.toBoolean() : thisv.toObject().as<BooleanObject>().unbox();
1.102 + args.rval().setBoolean(b);
1.103 + return true;
1.104 +}
1.105 +
1.106 +static bool
1.107 +bool_valueOf(JSContext *cx, unsigned argc, Value *vp)
1.108 +{
1.109 + CallArgs args = CallArgsFromVp(argc, vp);
1.110 + return CallNonGenericMethod<IsBoolean, bool_valueOf_impl>(cx, args);
1.111 +}
1.112 +
1.113 +static const JSFunctionSpec boolean_methods[] = {
1.114 +#if JS_HAS_TOSOURCE
1.115 + JS_FN(js_toSource_str, bool_toSource, 0, 0),
1.116 +#endif
1.117 + JS_FN(js_toString_str, bool_toString, 0, 0),
1.118 + JS_FS_END
1.119 +};
1.120 +
1.121 +static bool
1.122 +Boolean(JSContext *cx, unsigned argc, Value *vp)
1.123 +{
1.124 + CallArgs args = CallArgsFromVp(argc, vp);
1.125 +
1.126 + bool b = args.length() != 0 ? JS::ToBoolean(args[0]) : false;
1.127 +
1.128 + if (args.isConstructing()) {
1.129 + JSObject *obj = BooleanObject::create(cx, b);
1.130 + if (!obj)
1.131 + return false;
1.132 + args.rval().setObject(*obj);
1.133 + } else {
1.134 + args.rval().setBoolean(b);
1.135 + }
1.136 + return true;
1.137 +}
1.138 +
1.139 +JSObject *
1.140 +js_InitBooleanClass(JSContext *cx, HandleObject obj)
1.141 +{
1.142 + JS_ASSERT(obj->isNative());
1.143 +
1.144 + Rooted<GlobalObject*> global(cx, &obj->as<GlobalObject>());
1.145 +
1.146 + RootedObject booleanProto (cx, global->createBlankPrototype(cx, &BooleanObject::class_));
1.147 + if (!booleanProto)
1.148 + return nullptr;
1.149 + booleanProto->setFixedSlot(BooleanObject::PRIMITIVE_VALUE_SLOT, BooleanValue(false));
1.150 +
1.151 + RootedFunction ctor(cx, global->createConstructor(cx, Boolean, cx->names().Boolean, 1));
1.152 + if (!ctor)
1.153 + return nullptr;
1.154 +
1.155 + if (!LinkConstructorAndPrototype(cx, ctor, booleanProto))
1.156 + return nullptr;
1.157 +
1.158 + if (!DefinePropertiesAndBrand(cx, booleanProto, nullptr, boolean_methods))
1.159 + return nullptr;
1.160 +
1.161 + Handle<PropertyName*> valueOfName = cx->names().valueOf;
1.162 + RootedFunction
1.163 + valueOf(cx, NewFunction(cx, NullPtr(), bool_valueOf, 0, JSFunction::NATIVE_FUN,
1.164 + global, valueOfName));
1.165 + if (!valueOf)
1.166 + return nullptr;
1.167 +
1.168 + RootedValue value(cx, ObjectValue(*valueOf));
1.169 + if (!JSObject::defineProperty(cx, booleanProto, valueOfName, value,
1.170 + JS_PropertyStub, JS_StrictPropertyStub, 0))
1.171 + {
1.172 + return nullptr;
1.173 + }
1.174 +
1.175 + if (!GlobalObject::initBuiltinConstructor(cx, global, JSProto_Boolean, ctor, booleanProto))
1.176 + return nullptr;
1.177 +
1.178 + return booleanProto;
1.179 +}
1.180 +
1.181 +JSString *
1.182 +js_BooleanToString(ExclusiveContext *cx, bool b)
1.183 +{
1.184 + return b ? cx->names().true_ : cx->names().false_;
1.185 +}
1.186 +
1.187 +JS_PUBLIC_API(bool)
1.188 +js::ToBooleanSlow(HandleValue v)
1.189 +{
1.190 + if (v.isString())
1.191 + return v.toString()->length() != 0;
1.192 +
1.193 + JS_ASSERT(v.isObject());
1.194 + return !EmulatesUndefined(&v.toObject());
1.195 +}
1.196 +
1.197 +/*
1.198 + * This slow path is only ever taken for proxies wrapping Boolean objects
1.199 + * The only caller of the fast path, JSON's PreprocessValue, ensures that.
1.200 + */
1.201 +bool
1.202 +js::BooleanGetPrimitiveValueSlow(HandleObject wrappedBool)
1.203 +{
1.204 + JSObject *obj = wrappedBool->as<ProxyObject>().target();
1.205 + JS_ASSERT(obj);
1.206 + return obj->as<BooleanObject>().unbox();
1.207 +}
