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// Copyright 2016 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_CONSTRUCTOR_H_
#define V8_BUILTINS_BUILTINS_CONSTRUCTOR_H_
#include "src/objects/contexts.h"
#include "src/objects/dictionary.h"
#include "src/objects/js-array.h"
#include "src/objects/objects.h"
namespace v8 {
namespace internal {
class ConstructorBuiltins {
public:
static int MaximumFunctionContextSlots() {
return v8_flags.test_small_max_function_context_stub_size
? kSmallMaximumSlots
: kMaximumSlots;
}
// Maximum number of elements in copied array (chosen so that even an array
// backed by a double backing store will fit into new-space).
static const int kMaximumClonedShallowArrayElements =
JSArray::kInitialMaxFastElementArray;
// Maximum number of properties in copied object so that the properties store
// will fit into new-space. This constant is based on the assumption that
// NameDictionaries are 50% over-allocated.
static const int kMaximumClonedShallowObjectProperties =
NameDictionary::kMaxRegularCapacity / 3 * 2;
private:
static const int kMaximumSlots =
(kMaxRegularHeapObjectSize - Context::kTodoHeaderSize) / kTaggedSize - 1;
static const int kSmallMaximumSlots = 10;
// FastNewFunctionContext can only allocate closures which fit in the
// new space.
static_assert(Context::SizeFor(kMaximumSlots + Context::MIN_CONTEXT_SLOTS) <
kMaxRegularHeapObjectSize);
};
} // namespace internal
} // namespace v8
#endif // V8_BUILTINS_BUILTINS_CONSTRUCTOR_H_
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