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LibJS: Add left shift & right shift operator support for BigIntegers

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Based on https://tc39.es/ecma262/#sec-numeric-types-bigint-leftShift
(This commit also includes the matching tests)
This commit is contained in:
Idan Horowitz 2021-05-31 20:27:44 +03:00 • committed by Linus Groh
parent 4ee58d36c0
commit 67a5e9f018
2 changed files with 14 additions and 4 deletions
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16
Userland/Libraries/LibJS/Runtime/Value.cpp
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@ -787,8 +787,13 @@ Value left_shift(GlobalObject& global_object, Value lhs, Value rhs)
auto rhs_u32 = rhs_numeric.to_u32(global_object);
return Value(lhs_i32 << rhs_u32);
}
if (both_bigint(lhs_numeric, rhs_numeric))
TODO();
if (both_bigint(lhs_numeric, rhs_numeric)) {
auto multiplier_divisor = Crypto::SignedBigInteger { Crypto::NumberTheory::Power(Crypto::UnsignedBigInteger(2), rhs_numeric.as_bigint().big_integer().unsigned_value()) };
if (rhs_numeric.as_bigint().big_integer().is_negative())
return js_bigint(global_object.heap(), lhs_numeric.as_bigint().big_integer().divided_by(multiplier_divisor).quotient);
else
return js_bigint(global_object.heap(), lhs_numeric.as_bigint().big_integer().multiplied_by(multiplier_divisor));
}
global_object.vm().throw_exception<TypeError>(global_object, ErrorType::BigIntBadOperatorOtherType, "left-shift");
return {};
}
@ -813,8 +818,11 @@ Value right_shift(GlobalObject& global_object, Value lhs, Value rhs)
auto rhs_u32 = rhs_numeric.to_u32(global_object);
return Value(lhs_i32 >> rhs_u32);
}
if (both_bigint(lhs_numeric, rhs_numeric))
TODO();
if (both_bigint(lhs_numeric, rhs_numeric)) {
auto rhs_negated = rhs_numeric.as_bigint().big_integer();
rhs_negated.negate();
return left_shift(global_object, lhs, js_bigint(global_object.heap(), rhs_negated));
}
global_object.vm().throw_exception<TypeError>(global_object, ErrorType::BigIntBadOperatorOtherType, "right-shift");
return {};
}

2
Userland/Libraries/LibJS/Tests/builtins/BigInt/bigint-basic.js
View file

@ -28,6 +28,8 @@ describe("correct behavior", () => {
expect(1n | 2n).toBe(3n);
expect(5n ^ 3n).toBe(6n);
expect(~1n).toBe(-2n);
expect(5n << 2n).toBe(20n);
expect(7n >> 1n).toBe(3n);
});
test("increment operators", () => {