2692db8699
Note that as of this commit, there aren't any such throwers, and the call site in Heap::allocate will drop exceptions on the floor. This commit only serves to change the declaration of the overrides, make sure they return an empty value, and to propagate OOM errors frm their base initialize invocations.
107 lines
3.9 KiB
C++
107 lines
3.9 KiB
C++
/*
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* Copyright (c) 2020-2022, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/DeprecatedString.h>
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#include <LibJS/Runtime/AbstractOperations.h>
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#include <LibJS/Runtime/BigInt.h>
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#include <LibJS/Runtime/BigIntConstructor.h>
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#include <LibJS/Runtime/BigIntObject.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/VM.h>
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namespace JS {
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static const Crypto::SignedBigInteger BIGINT_ONE { 1 };
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BigIntConstructor::BigIntConstructor(Realm& realm)
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: NativeFunction(realm.vm().names.BigInt.as_string(), *realm.intrinsics().function_prototype())
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{
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}
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ThrowCompletionOr<void> BigIntConstructor::initialize(Realm& realm)
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{
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auto& vm = this->vm();
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MUST_OR_THROW_OOM(NativeFunction::initialize(realm));
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// 21.2.2.3 BigInt.prototype, https://tc39.es/ecma262/#sec-bigint.prototype
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define_direct_property(vm.names.prototype, realm.intrinsics().bigint_prototype(), 0);
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u8 attr = Attribute::Writable | Attribute::Configurable;
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define_native_function(realm, vm.names.asIntN, as_int_n, 2, attr);
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define_native_function(realm, vm.names.asUintN, as_uint_n, 2, attr);
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define_direct_property(vm.names.length, Value(1), Attribute::Configurable);
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return {};
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}
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// 21.2.1.1 BigInt ( value ), https://tc39.es/ecma262/#sec-bigint-constructor-number-value
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ThrowCompletionOr<Value> BigIntConstructor::call()
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{
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auto& vm = this->vm();
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auto value = vm.argument(0);
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// 2. Let prim be ? ToPrimitive(value, number).
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auto primitive = TRY(value.to_primitive(vm, Value::PreferredType::Number));
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// 3. If Type(prim) is Number, return ? NumberToBigInt(prim).
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if (primitive.is_number())
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return TRY(number_to_bigint(vm, primitive));
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// 4. Otherwise, return ? ToBigInt(prim).
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return TRY(primitive.to_bigint(vm));
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}
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// 21.2.1.1 BigInt ( value ), https://tc39.es/ecma262/#sec-bigint-constructor-number-value
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ThrowCompletionOr<NonnullGCPtr<Object>> BigIntConstructor::construct(FunctionObject&)
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{
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return vm().throw_completion<TypeError>(ErrorType::NotAConstructor, "BigInt");
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}
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// 21.2.2.1 BigInt.asIntN ( bits, bigint ), https://tc39.es/ecma262/#sec-bigint.asintn
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JS_DEFINE_NATIVE_FUNCTION(BigIntConstructor::as_int_n)
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{
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// 1. Set bits to ? ToIndex(bits).
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auto bits = TRY(vm.argument(0).to_index(vm));
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// 2. Set bigint to ? ToBigInt(bigint).
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auto* bigint = TRY(vm.argument(1).to_bigint(vm));
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// 3. Let mod be ℝ(bigint) modulo 2^bits.
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// FIXME: For large values of `bits`, this can likely be improved with a SignedBigInteger API to
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// drop the most significant bits.
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auto bits_shift_left = BIGINT_ONE.shift_left(bits);
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auto mod = modulo(bigint->big_integer(), bits_shift_left);
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// 4. If mod ≥ 2^(bits-1), return ℤ(mod - 2^bits); otherwise, return ℤ(mod).
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// NOTE: Some of the below conditionals are non-standard, but are to protect SignedBigInteger from
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// allocating an absurd amount of memory if `bits - 1` overflows to NumericLimits<size_t>::max.
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if ((bits == 0) && (mod >= BIGINT_ONE))
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return BigInt::create(vm, mod.minus(bits_shift_left));
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if ((bits > 0) && (mod >= BIGINT_ONE.shift_left(bits - 1)))
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return BigInt::create(vm, mod.minus(bits_shift_left));
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return BigInt::create(vm, mod);
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}
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// 21.2.2.2 BigInt.asUintN ( bits, bigint ), https://tc39.es/ecma262/#sec-bigint.asuintn
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JS_DEFINE_NATIVE_FUNCTION(BigIntConstructor::as_uint_n)
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{
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// 1. Set bits to ? ToIndex(bits).
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auto bits = TRY(vm.argument(0).to_index(vm));
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// 2. Set bigint to ? ToBigInt(bigint).
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auto* bigint = TRY(vm.argument(1).to_bigint(vm));
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// 3. Return the BigInt value that represents ℝ(bigint) modulo 2bits.
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// FIXME: For large values of `bits`, this can likely be improved with a SignedBigInteger API to
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// drop the most significant bits.
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return BigInt::create(vm, modulo(bigint->big_integer(), BIGINT_ONE.shift_left(bits)));
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}
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}
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