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https://github.com/LadybirdBrowser/ladybird
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c6a79c3ae3
Expose the Tommath limb allocation size from LibCrypto big integers. Use it as the external memory size for LibJS BigInt cells so large integer values participate in GC threshold calculations.
55 lines
1.4 KiB
C++
55 lines
1.4 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 <LibCrypto/BigInt/SignedBigInteger.h>
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#include <LibGC/Heap.h>
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#include <LibJS/Runtime/BigInt.h>
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#include <LibJS/Runtime/GlobalObject.h>
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namespace JS {
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GC_DEFINE_ALLOCATOR(BigInt);
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GC::Ref<BigInt> BigInt::create(VM& vm, Crypto::SignedBigInteger big_integer)
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{
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return vm.heap().allocate<BigInt>(move(big_integer));
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}
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BigInt::BigInt(Crypto::SignedBigInteger big_integer)
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: m_big_integer(move(big_integer))
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{
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}
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ErrorOr<String> BigInt::to_string() const
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{
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return String::formatted("{}n", TRY(m_big_integer.to_base(10)));
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}
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Utf16String BigInt::to_utf16_string() const
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{
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return Utf16String::formatted("{}n", MUST(m_big_integer.to_base(10)));
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}
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size_t BigInt::external_memory_size() const
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{
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return m_big_integer.external_memory_size();
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}
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// 21.2.1.1.1 NumberToBigInt ( number ), https://tc39.es/ecma262/#sec-numbertobigint
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ThrowCompletionOr<GC::Ref<BigInt>> number_to_bigint(VM& vm, Value number)
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{
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VERIFY(number.is_number());
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// 1. If IsIntegralNumber(number) is false, throw a RangeError exception.
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if (!number.is_integral_number())
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return vm.throw_completion<RangeError>(ErrorType::BigIntFromNonIntegral);
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// 2. Return the BigInt value that represents ℝ(number).
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return BigInt::create(vm, Crypto::SignedBigInteger { number.as_double() });
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}
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}
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