1 | // Copyright 2017 the V8 project authors. All rights reserved. |
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2 | // Use of this source code is governed by a BSD-style license that can be |
3 | // found in the LICENSE file. |
4 | |
5 | #include "src/builtins/builtins-utils-gen.h" |
6 | #include "src/builtins/builtins.h" |
7 | #include "src/code-stub-assembler.h" |
8 | |
9 | namespace v8 { |
10 | namespace internal { |
11 | |
12 | // https://tc39.github.io/proposal-bigint/#sec-to-big-int64 |
13 | TF_BUILTIN(BigIntToI64, CodeStubAssembler) { |
14 | if (!Is64()) { |
15 | Unreachable(); |
16 | return; |
17 | } |
18 | |
19 | TNode<Object> value = CAST(Parameter(Descriptor::kArgument)); |
20 | TNode<Context> context = CAST(Parameter(Descriptor::kContext)); |
21 | TNode<BigInt> bigint = ToBigInt(context, value); |
22 | |
23 | TVARIABLE(UintPtrT, var_low); |
24 | TVARIABLE(UintPtrT, var_high); |
25 | |
26 | // 2. Let int64bit be n modulo 2^64. |
27 | // 3. If int64bit ≥ 2^63, return int64bit - 2^64; |
28 | BigIntToRawBytes(bigint, &var_low, &var_high); |
29 | ReturnRaw(var_low.value()); |
30 | } |
31 | |
32 | // https://tc39.github.io/proposal-bigint/#sec-bigint-constructor-number-value |
33 | TF_BUILTIN(I64ToBigInt, CodeStubAssembler) { |
34 | if (!Is64()) { |
35 | Unreachable(); |
36 | return; |
37 | } |
38 | |
39 | TNode<IntPtrT> argument = |
40 | UncheckedCast<IntPtrT>(Parameter(Descriptor::kArgument)); |
41 | |
42 | Return(BigIntFromInt64(argument)); |
43 | } |
44 | |
45 | } // namespace internal |
46 | } // namespace v8 |
47 |