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/* -*- 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 "jsapi.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/JSAtom.h"
#include "vm/JSContext.h"
#include "vm/JSObject.h"
#include "vm/ProxyObject.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(js_toSource_str, bool_toSource, 0, 0),
JS_FN(js_toString_str, bool_toString, 0, 0),
JS_FN(js_valueOf_str, 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();
}
MOZ_ASSERT(v.isObject());
return !EmulatesUndefined(&v.toObject());
}