src/heap/factory-inl.h

// 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.

#ifndef V8_HEAP_FACTORY_INL_H_
#define V8_HEAP_FACTORY_INL_H_

#include "src/heap/factory.h"

// Clients of this interface shouldn't depend on lots of heap internals.
// Do not include anything from src/heap here!
#include "src/handles-inl.h"
#include "src/isolate-inl.h"
#include "src/objects-inl.h"
#include "src/objects/heap-number-inl.h"
#include "src/objects/oddball.h"
#include "src/string-hasher.h"

namespace v8 {
namespace internal {

#define ROOT_ACCESSOR(Type, name, CamelName)                                 \
  Handle<Type> Factory::name() {                                             \
    return Handle<Type>(&isolate()->roots_table()[RootIndex::k##CamelName]); \
  }
ROOT_LIST(ROOT_ACCESSOR)
#undef ROOT_ACCESSOR

Handle<String> Factory::InternalizeString(Handle<String> string) {
  if (string->IsInternalizedString()) return string;
  return StringTable::LookupString(isolate(), string);
}

Handle<Name> Factory::InternalizeName(Handle<Name> name) {
  if (name->IsUniqueName()) return name;
  return StringTable::LookupString(isolate(), Handle<String>::cast(name));
}

Handle<String> Factory::NewSubString(Handle<String> str, int begin, int end) {
  if (begin == 0 && end == str->length()) return str;
  return NewProperSubString(str, begin, end);
}

Handle<Object> Factory::NewNumberFromSize(size_t value,
                                          PretenureFlag pretenure) {
  // 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<Object>(Smi::FromIntptr(static_cast<intptr_t>(value)),
                          isolate());
  }
  return NewNumber(static_cast<double>(value), pretenure);
}

Handle<Object> Factory::NewNumberFromInt64(int64_t value,
                                           PretenureFlag pretenure) {
  if (value <= std::numeric_limits<int32_t>::max() &&
      value >= std::numeric_limits<int32_t>::min() &&
      Smi::IsValid(static_cast<int32_t>(value))) {
    return Handle<Object>(Smi::FromInt(static_cast<int32_t>(value)), isolate());
  }
  return NewNumber(static_cast<double>(value), pretenure);
}

Handle<HeapNumber> Factory::NewHeapNumber(double value,
                                          PretenureFlag pretenure) {
  Handle<HeapNumber> heap_number = NewHeapNumber(pretenure);
  heap_number->set_value(value);
  return heap_number;
}

Handle<MutableHeapNumber> Factory::NewMutableHeapNumber(
    double value, PretenureFlag pretenure) {
  Handle<MutableHeapNumber> number = NewMutableHeapNumber(pretenure);
  number->set_value(value);
  return number;
}

Handle<HeapNumber> Factory::NewHeapNumberFromBits(uint64_t bits,
                                                  PretenureFlag pretenure) {
  Handle<HeapNumber> heap_number = NewHeapNumber(pretenure);
  heap_number->set_value_as_bits(bits);
  return heap_number;
}

Handle<MutableHeapNumber> Factory::NewMutableHeapNumberFromBits(
    uint64_t bits, PretenureFlag pretenure) {
  Handle<MutableHeapNumber> number = NewMutableHeapNumber(pretenure);
  number->set_value_as_bits(bits);
  return number;
}

Handle<MutableHeapNumber> Factory::NewMutableHeapNumberWithHoleNaN(
    PretenureFlag pretenure) {
  return NewMutableHeapNumberFromBits(kHoleNanInt64, pretenure);
}

Handle<JSArray> Factory::NewJSArrayWithElements(Handle<FixedArrayBase> elements,
                                                ElementsKind elements_kind,
                                                PretenureFlag pretenure) {
  return NewJSArrayWithElements(elements, elements_kind, elements->length(),
                                pretenure);
}

Handle<Object> Factory::NewURIError() {
  return NewError(isolate()->uri_error_function(),
                  MessageTemplate::kURIMalformed);
}

Handle<String> Factory::Uint32ToString(uint32_t value, bool check_cache) {
  Handle<String> result;
  int32_t int32v = static_cast<int32_t>(value);
  if (int32v >= 0 && Smi::IsValid(int32v)) {
    result = NumberToString(Smi::FromInt(int32v), check_cache);
  } else {
    result = NumberToString(NewNumberFromUint(value), check_cache);
  }

  if (result->length() <= String::kMaxArrayIndexSize &&
      result->hash_field() == String::kEmptyHashField) {
    uint32_t field = StringHasher::MakeArrayIndexHash(value, result->length());
    result->set_hash_field(field);
  }
  return result;
}

}  // namespace internal
}  // namespace v8

#endif  // V8_HEAP_FACTORY_INL_H_