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LibJS+LibCrypto: Fix SignedBitInteger::bitwise_not and use it in LibJS

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Bitwise operators are defined on two's complement, but SignedBitInteger
uses sign-magnitude. Correctly convert between the two.

Let LibJS delegate to SignedBitInteger for bitwise_not, like it does
for all other bitwise_ operations on bigints.

No behavior change (LibJS is now the only client of
SignedBitInteger::bitwise_not()).
This commit is contained in:
Nico Weber 2022-01-17 12:22:51 -05:00 • committed by Ali Mohammad Pur
parent ec37eadb39
commit 945d962322
4 changed files with 15 additions and 5 deletions
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5
Userland/Libraries/LibJS/Runtime/Value.cpp
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@ -881,10 +881,7 @@ ThrowCompletionOr<Value> bitwise_not(GlobalObject& global_object, Value lhs)
auto lhs_numeric = TRY(lhs.to_numeric(global_object));
if (lhs_numeric.is_number())
return Value(~TRY(lhs_numeric.to_i32(global_object)));
auto big_integer_bitwise_not = lhs_numeric.as_bigint().big_integer();
big_integer_bitwise_not = big_integer_bitwise_not.plus(Crypto::SignedBigInteger { 1 });
big_integer_bitwise_not.negate();
return Value(js_bigint(vm, big_integer_bitwise_not));
return Value(js_bigint(vm, lhs_numeric.as_bigint().big_integer().bitwise_not()));
}
// 13.5.4 Unary + Operator, https://tc39.es/ecma262/#sec-unary-plus-operator