src/heap/factory-base-inl.h

// Copyright 2020 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_HEAP_FACTORY_BASE_INL_H_
#define V8_HEAP_FACTORY_BASE_INL_H_

#include "src/heap/factory-base.h"
#include "src/numbers/conversions.h"
#include "src/objects/heap-number.h"
#include "src/objects/map.h"
#include "src/objects/slots-inl.h"
#include "src/objects/smi.h"
#include "src/roots/roots.h"

namespace v8 {
namespace internal {

template <typename Impl>
Handle<Oddball> FactoryBase<Impl>::ToBoolean(bool value) {
  return value ? impl()->true_value() : impl()->false_value();
}

template <typename Impl>
template <AllocationType allocation>
Handle<Object> FactoryBase<Impl>::NewNumber(double value) {
  // Materialize as a SMI if possible.
  int32_t int_value;
  if (DoubleToSmiInteger(value, &int_value)) {
    return handle(Smi::FromInt(int_value), isolate());
  }
  return NewHeapNumber<allocation>(value);
}

template <typename Impl>
template <AllocationType allocation>
Handle<Object> FactoryBase<Impl>::NewNumberFromInt(int32_t value) {
  if (Smi::IsValid(value)) return handle(Smi::FromInt(value), isolate());
  // Bypass NewNumber to avoid various redundant checks.
  return NewHeapNumber<allocation>(FastI2D(value));
}

template <typename Impl>
template <AllocationType allocation>
Handle<Object> FactoryBase<Impl>::NewNumberFromUint(uint32_t value) {
  int32_t int32v = static_cast<int32_t>(value);
  if (int32v >= 0 && Smi::IsValid(int32v)) {
    return handle(Smi::FromInt(int32v), isolate());
  }
  return NewHeapNumber<allocation>(FastUI2D(value));
}

template <typename Impl>
template <AllocationType allocation>
Handle<Object> FactoryBase<Impl>::NewNumberFromSize(size_t value) {
  // We can't use Smi::IsValid() here because that operates on a signed
  // intptr_t, and casting from size_t could create a bogus sign bit.
  if (value <= static_cast<size_t>(Smi::kMaxValue)) {
    return handle(Smi::FromIntptr(static_cast<intptr_t>(value)), isolate());
  }
  return NewHeapNumber<allocation>(static_cast<double>(value));
}

template <typename Impl>
template <AllocationType allocation>
Handle<Object> FactoryBase<Impl>::NewNumberFromInt64(int64_t value) {
  if (value <= std::numeric_limits<int32_t>::max() &&
      value >= std::numeric_limits<int32_t>::min() &&
      Smi::IsValid(static_cast<int32_t>(value))) {
    return handle(Smi::FromInt(static_cast<int32_t>(value)), isolate());
  }
  return NewHeapNumber<allocation>(static_cast<double>(value));
}

template <typename Impl>
template <AllocationType allocation>
Handle<HeapNumber> FactoryBase<Impl>::NewHeapNumber(double value) {
  Handle<HeapNumber> heap_number = NewHeapNumber<allocation>();
  heap_number->set_value(value, kRelaxedStore);
  return heap_number;
}

template <typename Impl>
template <AllocationType allocation>
Handle<HeapNumber> FactoryBase<Impl>::NewHeapNumberFromBits(uint64_t bits) {
  Handle<HeapNumber> heap_number = NewHeapNumber<allocation>();
  heap_number->set_value_as_bits(bits, kRelaxedStore);
  return heap_number;
}

template <typename Impl>
template <AllocationType allocation>
Handle<HeapNumber> FactoryBase<Impl>::NewHeapNumberWithHoleNaN() {
  return NewHeapNumberFromBits<allocation>(kHoleNanInt64);
}

template <typename Impl>
template <typename StructType>
StructType FactoryBase<Impl>::NewStructInternal(InstanceType type,
                                                AllocationType allocation) {
  ReadOnlyRoots roots = read_only_roots();
  Map map = Map::GetInstanceTypeMap(roots, type);
  int size = StructType::kSize;
  return StructType::cast(NewStructInternal(roots, map, size, allocation));
}

template <typename Impl>
Struct FactoryBase<Impl>::NewStructInternal(ReadOnlyRoots roots, Map map,
                                            int size,
                                            AllocationType allocation) {
  DCHECK_EQ(size, map.instance_size());
  HeapObject result = AllocateRawWithImmortalMap(size, allocation, map);
  Struct str = Struct::cast(result);
  Object value = roots.undefined_value();
  int length = (size >> kTaggedSizeLog2) - 1;
  MemsetTagged(str.RawField(Struct::kHeaderSize), value, length);
  return str;
}

}  // namespace internal
}  // namespace v8

#endif  // V8_HEAP_FACTORY_BASE_INL_H_