tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

PropertyResult.h (3198B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
      2 * vim: set ts=8 sts=2 et sw=2 tw=80:
      3 * This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #ifndef vm_PropertyResult_h
      8 #define vm_PropertyResult_h
      9 
     10 #include "mozilla/Assertions.h"
     11 
     12 #include "vm/PropertyInfo.h"
     13 
     14 namespace js {
     15 
     16 class PropertyResult {
     17  enum class Kind : uint8_t {
     18    NotFound,
     19    NativeProperty,
     20    NonNativeProperty,
     21    DenseElement,
     22    TypedArrayElement,
     23  };
     24  enum class IgnoreProtoChain : uint8_t {
     25    No,
     26    RecursiveResolve,
     27    TypedArrayOutOfRange,
     28  };
     29  union {
     30    // Set if kind is NativeProperty.
     31    PropertyInfo propInfo_;
     32    // Set if kind is DenseElement.
     33    uint32_t denseIndex_;
     34    // Set if kind is TypedArrayElement.
     35    size_t typedArrayIndex_;
     36  };
     37  Kind kind_ = Kind::NotFound;
     38  IgnoreProtoChain ignoreProtoChain_ = IgnoreProtoChain::No;
     39 
     40 public:
     41  // Note: because PropertyInfo does not have a default constructor, we can't
     42  // use |= default| here.
     43  PropertyResult() {}
     44 
     45  // When a property is not found, we may additionally indicate that the
     46  // prototype chain should be ignored. This occurs for:
     47  //  - An out-of-range numeric property on a TypedArrayObject.
     48  //  - A resolve hook recursively calling itself as it sets the property.
     49  bool isNotFound() const { return kind_ == Kind::NotFound; }
     50  bool shouldIgnoreProtoChain() const {
     51    MOZ_ASSERT(isNotFound());
     52    return ignoreProtoChain_ != IgnoreProtoChain::No;
     53  }
     54  bool isTypedArrayOutOfRange() const {
     55    MOZ_ASSERT(isNotFound());
     56    return ignoreProtoChain_ == IgnoreProtoChain::TypedArrayOutOfRange;
     57  }
     58 
     59  bool isFound() const { return kind_ != Kind::NotFound; }
     60  bool isNonNativeProperty() const { return kind_ == Kind::NonNativeProperty; }
     61  bool isDenseElement() const { return kind_ == Kind::DenseElement; }
     62  bool isTypedArrayElement() const { return kind_ == Kind::TypedArrayElement; }
     63  bool isNativeProperty() const { return kind_ == Kind::NativeProperty; }
     64 
     65  PropertyInfo propertyInfo() const {
     66    MOZ_ASSERT(isNativeProperty());
     67    return propInfo_;
     68  }
     69 
     70  uint32_t denseElementIndex() const {
     71    MOZ_ASSERT(isDenseElement());
     72    return denseIndex_;
     73  }
     74 
     75  size_t typedArrayElementIndex() const {
     76    MOZ_ASSERT(isTypedArrayElement());
     77    return typedArrayIndex_;
     78  }
     79 
     80  void setNotFound() { kind_ = Kind::NotFound; }
     81 
     82  void setNativeProperty(PropertyInfo prop) {
     83    kind_ = Kind::NativeProperty;
     84    propInfo_ = prop;
     85  }
     86 
     87  void setProxyProperty() { kind_ = Kind::NonNativeProperty; }
     88 
     89  void setDenseElement(uint32_t index) {
     90    kind_ = Kind::DenseElement;
     91    denseIndex_ = index;
     92  }
     93 
     94  void setTypedArrayElement(size_t index) {
     95    kind_ = Kind::TypedArrayElement;
     96    typedArrayIndex_ = index;
     97  }
     98 
     99  void setTypedArrayOutOfRange() {
    100    kind_ = Kind::NotFound;
    101    ignoreProtoChain_ = IgnoreProtoChain::TypedArrayOutOfRange;
    102  }
    103  void setRecursiveResolve() {
    104    kind_ = Kind::NotFound;
    105    ignoreProtoChain_ = IgnoreProtoChain::RecursiveResolve;
    106  }
    107 };
    108 
    109 }  // namespace js
    110 
    111 #endif /* vm_PropertyResult_h */