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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* 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/. */
#include "builtin/BigInt.h"
#include "jsapi.h"
#include "builtin/TypedObject.h"
#include "gc/Tracer.h"
#include "js/TracingAPI.h"
#include "vm/ArrayBufferObject.h"
#include "vm/BigIntType.h"
#include "vm/SelfHosting.h"
#include "vm/TaggedProto.h"
#include "vm/NativeObject-inl.h"
using namespace js;
static MOZ_ALWAYS_INLINE bool
IsBigInt(HandleValue v)
{
return v.isBigInt() || (v.isObject() && v.toObject().is<BigIntObject>());
}
static JSObject*
CreateBigIntPrototype(JSContext* cx, JSProtoKey key)
{
return GlobalObject::createBlankPrototype<PlainObject>(cx, cx->global());
}
// BigInt proposal section 5.1.3
static bool
BigIntConstructor(JSContext* cx, unsigned argc, Value* vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
// Step 1.
if (args.isConstructing()) {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_NOT_CONSTRUCTOR, "BigInt");
return false;
}
// Step 2.
RootedValue v(cx, args.get(0));
if (!ToPrimitive(cx, JSTYPE_NUMBER, &v))
return false;
// Steps 3-4.
BigInt* bi = v.isNumber()
? NumberToBigInt(cx, v.toNumber())
: ToBigInt(cx, v);
if (!bi)
return false;
args.rval().setBigInt(bi);
return true;
}
JSObject*
BigIntObject::create(JSContext* cx, HandleBigInt bigInt)
{
RootedObject obj(cx, NewBuiltinClassInstance(cx, &class_));
if (!obj)
return nullptr;
BigIntObject& bn = obj->as<BigIntObject>();
bn.setFixedSlot(PRIMITIVE_VALUE_SLOT, BigIntValue(bigInt));
return &bn;
}
BigInt*
BigIntObject::unbox() const
{
return getFixedSlot(PRIMITIVE_VALUE_SLOT).toBigInt();
}
// BigInt proposal section 5.3.4
bool
BigIntObject::valueOf_impl(JSContext* cx, const CallArgs& args)
{
// Step 1.
HandleValue thisv = args.thisv();
MOZ_ASSERT(IsBigInt(thisv));
RootedBigInt bi(cx, thisv.isBigInt()
? thisv.toBigInt()
: thisv.toObject().as<BigIntObject>().unbox());
args.rval().setBigInt(bi);
return true;
}
bool
BigIntObject::valueOf(JSContext* cx, unsigned argc, Value* vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
return CallNonGenericMethod<IsBigInt, valueOf_impl>(cx, args);
}
// BigInt proposal section 5.3.3
bool
BigIntObject::toString_impl(JSContext* cx, const CallArgs& args)
{
// Step 1.
HandleValue thisv = args.thisv();
MOZ_ASSERT(IsBigInt(thisv));
RootedBigInt bi(cx, thisv.isBigInt()
? thisv.toBigInt()
: thisv.toObject().as<BigIntObject>().unbox());
// Steps 2-3.
uint8_t radix = 10;
// Steps 4-5.
if (args.hasDefined(0)) {
double d;
if (!ToInteger(cx, args.get(0), &d))
return false;
if (d < 2 || d > 36) {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_BAD_RADIX);
return false;
}
radix = d;
}
// Steps 6-7.
JSLinearString* str = BigInt::toString(cx, bi, radix);
if (!str)
return false;
args.rval().setString(str);
return true;
}
bool
BigIntObject::toString(JSContext* cx, unsigned argc, Value* vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
return CallNonGenericMethod<IsBigInt, toString_impl>(cx, args);
}
// BigInt proposal section 5.2.1. BigInt.asUintN ( bits, bigint )
bool
BigIntObject::asUintN(JSContext* cx, unsigned argc, Value* vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
// Step 1.
uint64_t bits;
if (!ToIndex(cx, args.get(0), &bits)) {
return false;
}
// Step 2.
RootedBigInt bi(cx, ToBigInt(cx, args.get(1)));
if (!bi) {
return false;
}
// Step 3.
BigInt* res = BigInt::asUintN(cx, bi, bits);
if (!res) {
return false;
}
args.rval().setBigInt(res);
return true;
}
// BigInt proposal section 5.2.2. BigInt.asIntN ( bits, bigint )
bool
BigIntObject::asIntN(JSContext* cx, unsigned argc, Value* vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
// Step 1.
uint64_t bits;
if (!ToIndex(cx, args.get(0), &bits)) {
return false;
}
// Step 2.
RootedBigInt bi(cx, ToBigInt(cx, args.get(1)));
if (!bi) {
return false;
}
// Step 3.
BigInt* res = BigInt::asIntN(cx, bi, bits);
if (!res) {
return false;
}
args.rval().setBigInt(res);
return true;
}
const ClassSpec BigIntObject::classSpec_ = {
GenericCreateConstructor<BigIntConstructor, 1, gc::AllocKind::FUNCTION>,
CreateBigIntPrototype,
BigIntObject::staticMethods,
nullptr,
BigIntObject::methods,
BigIntObject::properties
};
const Class BigIntObject::class_ = {
"BigInt",
JSCLASS_HAS_CACHED_PROTO(JSProto_BigInt) |
JSCLASS_HAS_RESERVED_SLOTS(RESERVED_SLOTS),
JS_NULL_CLASS_OPS,
&BigIntObject::classSpec_
};
const JSPropertySpec BigIntObject::properties[] = {
// BigInt proposal section 5.3.5
JS_STRING_SYM_PS(toStringTag, "BigInt", JSPROP_READONLY),
JS_PS_END
};
const JSFunctionSpec BigIntObject::methods[] = {
JS_FN("valueOf", valueOf, 0, 0),
JS_FN("toString", toString, 0, 0),
JS_SELF_HOSTED_FN("toLocaleString", "BigInt_toLocaleString", 0, 0),
JS_FS_END
};
const JSFunctionSpec BigIntObject::staticMethods[] = {
JS_FN("asUintN", asUintN, 2, 0),
JS_FN("asIntN", asIntN, 2, 0),
JS_FS_END
};
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