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Issue #1240 - Part 6c - Implement asIntN and asUintN methods for BigInt values. https://bugzilla.mozilla.org/show_bug.cgi?id=1501104

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Brian Smith 2023-07-19 16:39:34 -05:00 • committed by roytam1
commit bbbab3898f
2 changed files with 66 additions and 1 deletions
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64
js/src/builtin/BigInt.cpp
View file

@ -179,10 +179,66 @@ BigIntObject::toLocaleString(JSContext* cx, unsigned argc, Value* vp)
return CallNonGenericMethod<IsBigInt, toLocaleString_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[0], &bits)) {
return false;
}
// Step 2.
RootedBigInt bi(cx, ToBigInt(cx, args[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[0], &bits)) {
return false;
}
// Step 2.
RootedBigInt bi(cx, ToBigInt(cx, args[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,
nullptr,
BigIntObject::staticMethods,
nullptr,
BigIntObject::methods,
BigIntObject::properties
@ -208,3 +264,9 @@ const JSFunctionSpec BigIntObject::methods[] = {
JS_FN("toLocaleString", 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
};

3
js/src/builtin/BigInt.h
View file

@ -33,12 +33,15 @@ class BigIntObject : public NativeObject
static bool toString(JSContext* cx, unsigned argc, JS::Value* vp);
static bool toLocaleString_impl(JSContext* cx, const CallArgs& args);
static bool toLocaleString(JSContext* cx, unsigned argc, JS::Value* vp);
static bool asUintN(JSContext* cx, unsigned argc, JS::Value* vp);
static bool asIntN(JSContext* cx, unsigned argc, JS::Value* vp);
JS::BigInt* unbox() const;
private:
static const JSPropertySpec properties[];
static const JSFunctionSpec methods[];
static const JSFunctionSpec staticMethods[];
};
extern JSObject*