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LibJS: Throw RangeError on BigInt division/modulo by zero

Browse Source 
https://tc39.es/ecma262/#sec-numeric-types-bigint-divide
https://tc39.es/ecma262/#sec-numeric-types-bigint-remainder
This commit is contained in:
Linus Groh 2021-03-16 20:34:40 +01:00 committed by Andreas Kling
parent 1d8ab74cbf
commit 11138f5c1f
Notes: sideshowbarker 2024-07-18 21:17:35 +09:00 
Author: https://github.com/linusg
Commit: https://github.com/SerenityOS/serenity/commit/11138f5c1ff
Pull-request: https://github.com/SerenityOS/serenity/pull/5833
3 changed files with 30 additions and 8 deletions
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1
Userland/Libraries/LibJS/Runtime/ErrorTypes.h
View File

@ -43,6 +43,7 @@
M(Convert, "Cannot convert {} to {}") \
M(ConvertUndefinedToObject, "Cannot convert undefined to object") \
M(DescChangeNonConfigurable, "Cannot change attributes of non-configurable property '{}'") \
M(DivisionByZero, "Division by zero") \
M(FunctionArgsNotObject, "Argument array must be an object") \
M(InOperatorWithObject, "'in' operator must be used on an object") \
M(InstanceOfOperatorBadPrototype, "'prototype' property of {} is not an object") \

28
Userland/Libraries/LibJS/Runtime/Value.cpp
View File

@ -882,27 +882,34 @@ Value mul(GlobalObject& global_object, Value lhs, Value rhs)
Value div(GlobalObject& global_object, Value lhs, Value rhs)
{
auto& vm = global_object.vm();
auto lhs_numeric = lhs.to_numeric(global_object.global_object());
if (global_object.vm().exception())
if (vm.exception())
return {};
auto rhs_numeric = rhs.to_numeric(global_object.global_object());
if (global_object.vm().exception())
if (vm.exception())
return {};
if (both_number(lhs_numeric, rhs_numeric))
return Value(lhs_numeric.as_double() / rhs_numeric.as_double());
if (both_bigint(lhs_numeric, rhs_numeric))
if (both_bigint(lhs_numeric, rhs_numeric)) {
if (rhs_numeric.as_bigint().big_integer() == BIGINT_ZERO) {
vm.throw_exception<RangeError>(global_object, ErrorType::DivisionByZero);
return {};
}
return js_bigint(global_object.heap(), lhs_numeric.as_bigint().big_integer().divided_by(rhs_numeric.as_bigint().big_integer()).quotient);
global_object.vm().throw_exception<TypeError>(global_object.global_object(), ErrorType::BigIntBadOperatorOtherType, "division");
}
vm.throw_exception<TypeError>(global_object.global_object(), ErrorType::BigIntBadOperatorOtherType, "division");
return {};
}
Value mod(GlobalObject& global_object, Value lhs, Value rhs)
{
auto& vm = global_object.vm();
auto lhs_numeric = lhs.to_numeric(global_object.global_object());
if (global_object.vm().exception())
if (vm.exception())
return {};
auto rhs_numeric = rhs.to_numeric(global_object.global_object());
if (global_object.vm().exception())
if (vm.exception())
return {};
if (both_number(lhs_numeric, rhs_numeric)) {
if (lhs_numeric.is_nan() || rhs_numeric.is_nan())
@ -912,9 +919,14 @@ Value mod(GlobalObject& global_object, Value lhs, Value rhs)
auto trunc = (double)(i32)(index / period);
return Value(index - trunc * period);
}
if (both_bigint(lhs_numeric, rhs_numeric))
if (both_bigint(lhs_numeric, rhs_numeric)) {
if (rhs_numeric.as_bigint().big_integer() == BIGINT_ZERO) {
vm.throw_exception<RangeError>(global_object, ErrorType::DivisionByZero);
return {};
}
return js_bigint(global_object.heap(), lhs_numeric.as_bigint().big_integer().divided_by(rhs_numeric.as_bigint().big_integer()).remainder);
global_object.vm().throw_exception<TypeError>(global_object.global_object(), ErrorType::BigIntBadOperatorOtherType, "modulo");
}
vm.throw_exception<TypeError>(global_object.global_object(), ErrorType::BigIntBadOperatorOtherType, "modulo");
return {};
}

9
Userland/Libraries/LibJS/Tests/builtins/BigInt/bigint-basic.js
View File

@ -87,4 +87,13 @@ describe("errors", () => {
+123n;
}).toThrowWithMessage(TypeError, "Cannot convert BigInt to number");
});
test("division by zero", () => {
expect(() => {
1n / 0n;
}).toThrowWithMessage(RangeError, "Division by zero");
expect(() => {
1n % 0n;
}).toThrowWithMessage(RangeError, "Division by zero");
});
});