/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: set ts=8 sts=2 et sw=2 tw=80:
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef vm_ArrayObject_inl_h
#define vm_ArrayObject_inl_h

#include "vm/ArrayObject.h"

#include "gc/Allocator.h"
#include "gc/GCProbes.h"

#include "vm/JSObject-inl.h"
#include "vm/NativeObject-inl.h"

namespace js {

/* static */ MOZ_ALWAYS_INLINE ArrayObject* ArrayObject::create(
    JSContext* cx, gc::AllocKind kind, gc::Heap heap,
    Handle<SharedShape*> shape, uint32_t length, uint32_t slotSpan,
    AutoSetNewObjectMetadata& metadata, gc::AllocSite* site) {
  debugCheckNewObject(shape, kind, heap);

  const JSClass* clasp = &ArrayObject::class_;
  MOZ_ASSERT(shape);
  MOZ_ASSERT(shape->getObjectClass() == clasp);
  MOZ_ASSERT(clasp->isNativeObject());
  MOZ_ASSERT(!clasp->hasFinalize());

  // Note: the slot span is passed as argument to allow more constant folding
  // below for the common case of slotSpan == 0.
  MOZ_ASSERT(shape->slotSpan() == slotSpan);

  // Arrays can use their fixed slots to store elements, so can't have shapes
  // which allow named properties to be stored in the fixed slots.
  MOZ_ASSERT(shape->numFixedSlots() == 0);

  size_t nDynamicSlots = calculateDynamicSlots(0, slotSpan, clasp);
  ArrayObject* aobj = cx->newCell<ArrayObject>(kind, heap, clasp, site);
  if (!aobj) {
    return nullptr;
  }

  aobj->initShape(shape);
  aobj->initFixedElements(kind, length);

  if (!nDynamicSlots) {
    aobj->initEmptyDynamicSlots();
  } else if (!aobj->allocateInitialSlots(cx, nDynamicSlots)) {
    return nullptr;
  }

  MOZ_ASSERT(clasp->shouldDelayMetadataBuilder());
  cx->realm()->setObjectPendingMetadata(aobj);

  if (slotSpan > 0) {
    aobj->initDynamicSlots(slotSpan);
  }

  gc::gcprobes::CreateObject(aobj);
  return aobj;
}

inline DenseElementResult ArrayObject::addDenseElementNoLengthChange(
    JSContext* cx, uint32_t index, const Value& val) {
  MOZ_ASSERT(isExtensible());

  // Only support the `index < length` case so that we don't have to increase
  // the array's .length value below.
  if (index >= length() || containsDenseElement(index) || isIndexed()) {
    return DenseElementResult::Incomplete;
  }

  DenseElementResult res = ensureDenseElements(cx, index, 1);
  if (MOZ_UNLIKELY(res != DenseElementResult::Success)) {
    return res;
  }

  initDenseElement(index, val);
  return DenseElementResult::Success;
}

}  // namespace js

#endif  // vm_ArrayObject_inl_h
