arguments.h 2.81 KB
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// 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_OBJECTS_ARGUMENTS_H_
#define V8_OBJECTS_ARGUMENTS_H_

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#include "src/objects/fixed-array.h"
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#include "src/objects/js-objects.h"
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#include "src/objects/struct.h"
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// Has to be the last include (doesn't have include guards):
#include "src/objects/object-macros.h"

namespace v8 {
namespace internal {

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class StructBodyDescriptor;

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#include "torque-generated/src/objects/arguments-tq.inc"

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// Superclass for all objects with instance type {JS_ARGUMENTS_OBJECT_TYPE}
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class JSArgumentsObject
    : public TorqueGeneratedJSArgumentsObject<JSArgumentsObject, JSObject> {
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 public:
  DECL_VERIFIER(JSArgumentsObject)
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  DECL_PRINTER(JSArgumentsObject)
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  TQ_OBJECT_CONSTRUCTORS(JSArgumentsObject)
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};

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// JSSloppyArgumentsObject is just a JSArgumentsObject with specific initial
// map. This initial map adds in-object properties for "length" and "callee".
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class JSSloppyArgumentsObject
    : public TorqueGeneratedJSSloppyArgumentsObject<JSSloppyArgumentsObject,
                                                    JSArgumentsObject> {
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 public:
  // Indices of in-object properties.
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  static const int kLengthIndex = 0;
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  static const int kCalleeIndex = kLengthIndex + 1;

 private:
  DISALLOW_IMPLICIT_CONSTRUCTORS(JSSloppyArgumentsObject);
};

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// JSStrictArgumentsObject is just a JSArgumentsObject with specific initial
// map. This initial map adds an in-object property for "length".
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class JSStrictArgumentsObject
    : public TorqueGeneratedJSStrictArgumentsObject<JSStrictArgumentsObject,
                                                    JSArgumentsObject> {
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 public:
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  // Indices of in-object properties.
  static const int kLengthIndex = 0;
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  static_assert(kLengthIndex == JSSloppyArgumentsObject::kLengthIndex);
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 private:
  DISALLOW_IMPLICIT_CONSTRUCTORS(JSStrictArgumentsObject);
};

// Representation of a slow alias as part of a sloppy arguments objects.
// For fast aliases (if HasSloppyArgumentsElements()):
// - the parameter map contains an index into the context
// - all attributes of the element have default values
// For slow aliases (if HasDictionaryArgumentsElements()):
// - the parameter map contains no fast alias mapping (i.e. the hole)
// - this struct (in the slow backing store) contains an index into the context
// - all attributes are available as part if the property details
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class AliasedArgumentsEntry
    : public TorqueGeneratedAliasedArgumentsEntry<AliasedArgumentsEntry,
                                                  Struct> {
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 public:
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  using BodyDescriptor = StructBodyDescriptor;

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  TQ_OBJECT_CONSTRUCTORS(AliasedArgumentsEntry)
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};

}  // namespace internal
}  // namespace v8

#include "src/objects/object-macros-undef.h"

#endif  // V8_OBJECTS_ARGUMENTS_H_