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// Copyright 2019 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.

#ifndef V8_BUILTINS_BUILTINS_BIGINT_GEN_H_
#define V8_BUILTINS_BUILTINS_BIGINT_GEN_H_

#include "src/codegen/code-stub-assembler.h"
#include "src/objects/bigint.h"

namespace v8 {
namespace internal {

class BigIntBuiltinsAssembler : public CodeStubAssembler {
 public:
  explicit BigIntBuiltinsAssembler(compiler::CodeAssemblerState* state)
      : CodeStubAssembler(state) {}

  TNode<IntPtrT> ReadBigIntLength(TNode<BigInt> value) {
    TNode<Word32T> bitfield = LoadBigIntBitfield(value);
    return ChangeInt32ToIntPtr(
        Signed(DecodeWord32<BigIntBase::LengthBits>(bitfield)));
  }

  TNode<Uint32T> ReadBigIntSign(TNode<BigInt> value) {
    TNode<Word32T> bitfield = LoadBigIntBitfield(value);
    return DecodeWord32<BigIntBase::SignBits>(bitfield);
  }

  void WriteBigIntSignAndLength(TNode<BigInt> bigint, TNode<Uint32T> sign,
                                TNode<IntPtrT> length) {
    STATIC_ASSERT(BigIntBase::SignBits::kShift == 0);
    TNode<Uint32T> bitfield = Unsigned(
        Word32Or(Word32Shl(TruncateIntPtrToInt32(length),
                           Int32Constant(BigIntBase::LengthBits::kShift)),
                 Word32And(sign, Int32Constant(BigIntBase::SignBits::kMask))));
    StoreBigIntBitfield(bigint, bitfield);
  }

  void CppAbsoluteAddAndCanonicalize(TNode<BigInt> result, TNode<BigInt> x,
                                     TNode<BigInt> y) {
    TNode<ExternalReference> mutable_big_int_absolute_add_and_canonicalize =
        ExternalConstant(
            ExternalReference::
                mutable_big_int_absolute_add_and_canonicalize_function());
    CallCFunction(mutable_big_int_absolute_add_and_canonicalize,
                  MachineType::AnyTagged(),
                  std::make_pair(MachineType::AnyTagged(), result),
                  std::make_pair(MachineType::AnyTagged(), x),
                  std::make_pair(MachineType::AnyTagged(), y));
  }

  void CppAbsoluteSubAndCanonicalize(TNode<BigInt> result, TNode<BigInt> x,
                                     TNode<BigInt> y) {
    TNode<ExternalReference> mutable_big_int_absolute_sub_and_canonicalize =
        ExternalConstant(
            ExternalReference::
                mutable_big_int_absolute_sub_and_canonicalize_function());
    CallCFunction(mutable_big_int_absolute_sub_and_canonicalize,
                  MachineType::AnyTagged(),
                  std::make_pair(MachineType::AnyTagged(), result),
                  std::make_pair(MachineType::AnyTagged(), x),
                  std::make_pair(MachineType::AnyTagged(), y));
  }

  TNode<Int32T> CppAbsoluteCompare(TNode<BigInt> x, TNode<BigInt> y) {
    TNode<ExternalReference> mutable_big_int_absolute_compare =
        ExternalConstant(
            ExternalReference::mutable_big_int_absolute_compare_function());
    TNode<Int32T> result = UncheckedCast<Int32T>(
        CallCFunction(mutable_big_int_absolute_compare, MachineType::Int32(),
                      std::make_pair(MachineType::AnyTagged(), x),
                      std::make_pair(MachineType::AnyTagged(), y)));
    return result;
  }
};

}  // namespace internal
}  // namespace v8
#endif  // V8_BUILTINS_BUILTINS_BIGINT_GEN_H_

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