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/* -*- 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_PropertyResult_h
#define vm_PropertyResult_h
#include "mozilla/Assertions.h"
#include "js/HeapAPI.h"
#include "js/RootingAPI.h"
#include "vm/Shape.h"
namespace js {
class PropertyResult {
enum class Kind : uint8_t {
NotFound,
NativeProperty,
NonNativeProperty,
DenseElement,
TypedArrayElement,
};
union {
// Set if kind is NativeProperty.
PropertyInfo propInfo_;
// Set if kind is DenseElement.
uint32_t denseIndex_;
// Set if kind is TypedArrayElement.
size_t typedArrayIndex_;
};
Kind kind_ = Kind::NotFound;
bool ignoreProtoChain_ = false;
public:
// Note: because PropertyInfo does not have a default constructor, we can't
// use |= default| here.
PropertyResult() {}
// When a property is not found, we may additionally indicate that the
// prototype chain should be ignored. This occurs for:
// - An out-of-range numeric property on a TypedArrayObject.
// - A resolve hook recursively calling itself as it sets the property.
bool isNotFound() const { return kind_ == Kind::NotFound; }
bool shouldIgnoreProtoChain() const {
MOZ_ASSERT(isNotFound());
return ignoreProtoChain_;
}
bool isFound() const { return kind_ != Kind::NotFound; }
bool isNonNativeProperty() const { return kind_ == Kind::NonNativeProperty; }
bool isDenseElement() const { return kind_ == Kind::DenseElement; }
bool isTypedArrayElement() const { return kind_ == Kind::TypedArrayElement; }
bool isNativeProperty() const { return kind_ == Kind::NativeProperty; }
PropertyInfo propertyInfo() const {
MOZ_ASSERT(isNativeProperty());
return propInfo_;
}
uint32_t denseElementIndex() const {
MOZ_ASSERT(isDenseElement());
return denseIndex_;
}
size_t typedArrayElementIndex() const {
MOZ_ASSERT(isTypedArrayElement());
return typedArrayIndex_;
}
void setNotFound() { kind_ = Kind::NotFound; }
void setNativeProperty(PropertyInfo prop) {
kind_ = Kind::NativeProperty;
propInfo_ = prop;
}
void setTypedObjectProperty() { kind_ = Kind::NonNativeProperty; }
void setProxyProperty() { kind_ = Kind::NonNativeProperty; }
void setDenseElement(uint32_t index) {
kind_ = Kind::DenseElement;
denseIndex_ = index;
}
void setTypedArrayElement(size_t index) {
kind_ = Kind::TypedArrayElement;
typedArrayIndex_ = index;
}
void setTypedArrayOutOfRange() {
kind_ = Kind::NotFound;
ignoreProtoChain_ = true;
}
void setRecursiveResolve() {
kind_ = Kind::NotFound;
ignoreProtoChain_ = true;
}
};
} // namespace js
#endif /* vm_PropertyResult_h */