| // Copyright 2017 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/builtins/builtins-bigint-gen.h" |
| #include "src/builtins/builtins-utils-gen.h" |
| #include "src/builtins/builtins.h" |
| #include "src/codegen/code-stub-assembler.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| // https://tc39.github.io/proposal-bigint/#sec-to-big-int64 |
| TF_BUILTIN(BigIntToI64, CodeStubAssembler) { |
| if (!Is64()) { |
| Unreachable(); |
| return; |
| } |
| |
| TNode<Object> value = CAST(Parameter(Descriptor::kArgument)); |
| TNode<Context> context = CAST(Parameter(Descriptor::kContext)); |
| TNode<BigInt> bigint = ToBigInt(context, value); |
| |
| TVARIABLE(UintPtrT, var_low); |
| TVARIABLE(UintPtrT, var_high); |
| |
| // 2. Let int64bit be n modulo 2^64. |
| // 3. If int64bit ≥ 2^63, return int64bit - 2^64; |
| BigIntToRawBytes(bigint, &var_low, &var_high); |
| ReturnRaw(var_low.value()); |
| } |
| |
| // https://tc39.github.io/proposal-bigint/#sec-bigint-constructor-number-value |
| TF_BUILTIN(I64ToBigInt, CodeStubAssembler) { |
| if (!Is64()) { |
| Unreachable(); |
| return; |
| } |
| |
| TNode<IntPtrT> argument = |
| UncheckedCast<IntPtrT>(Parameter(Descriptor::kArgument)); |
| |
| Return(BigIntFromInt64(argument)); |
| } |
| |
| } // namespace internal |
| } // namespace v8 |