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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/bindings/bigint.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
#include "v8/include/v8-context.h"
#include "v8/include/v8-exception.h"
#include "v8/include/v8-local-handle.h"
#include "v8/include/v8-primitive.h"
#include "v8/include/v8-value.h"
namespace blink {
// This implementation is based on `v8::internal::BigInt::AsInt64`.
// https://source.chromium.org/chromium/chromium/src/+/main:v8/src/objects/bigint.cc;drc=17252ebab8c8f8977b19616706fa98dcf4d9d7ae;l=1443
std::optional<int64_t> BigInt::ToInt64() const {
if (words_.empty()) {
return 0;
}
if (words_.size() != 1) {
return std::nullopt;
}
uint64_t raw = words_[0];
// Simulate two's complement.
raw = IsNegative() ? ((~raw) + 1u) : raw;
int64_t result = static_cast<int64_t>(raw);
if ((result < 0) != IsNegative()) {
return std::nullopt;
}
return result;
}
// This implementation is based on `v8::Internal::BigInt::AsUint64`.
// https://source.chromium.org/chromium/chromium/src/+/main:v8/src/objects/bigint.cc;drc=17252ebab8c8f8977b19616706fa98dcf4d9d7ae;l=1450
std::optional<uint64_t> BigInt::ToUInt64() const {
if (words_.empty()) {
return 0;
}
if (IsNegative() || words_.size() != 1) {
return std::nullopt;
}
return words_[0];
}
BigInt ToBigIntSlow(v8::Isolate* isolate,
v8::Local<v8::Value> value,
ExceptionState& exception_state) {
DCHECK(!value->IsBigInt());
if (!RuntimeEnabledFeatures::WebIDLBigIntUsesToBigIntEnabled()) {
exception_state.ThrowTypeError("The provided value is not a BigInt.");
return BigInt();
}
TryRethrowScope rethrow_scope(isolate, exception_state);
v8::Local<v8::BigInt> bigint_value;
if (!value->ToBigInt(isolate->GetCurrentContext()).ToLocal(&bigint_value)) {
return BigInt();
}
return BigInt(bigint_value);
}
} // namespace blink
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