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| 1 | +// Copyright 2018 the V8 project authors. All rights reserved. |
| 2 | +// Use of this source code is governed by a BSD-style license that can be |
| 3 | +// found in the LICENSE file. |
| 4 | + |
| 5 | +#include "src/debug/debug-property-iterator.h" |
| 6 | + |
| 7 | +#include "src/api-inl.h" |
| 8 | +#include "src/base/flags.h" |
| 9 | +#include "src/keys.h" |
| 10 | +#include "src/objects/js-array-buffer-inl.h" |
| 11 | +#include "src/property-descriptor.h" |
| 12 | +#include "src/property-details.h" |
| 13 | + |
| 14 | +namespace v8 { |
| 15 | + |
| 16 | +std::unique_ptr<debug::PropertyIterator> debug::PropertyIterator::Create( |
| 17 | + v8::Local<v8::Object> v8_object) { |
| 18 | + internal::Isolate* isolate = |
| 19 | + reinterpret_cast<internal::Isolate*>(v8_object->GetIsolate()); |
| 20 | + return std::unique_ptr<debug::PropertyIterator>( |
| 21 | + new internal::DebugPropertyIterator(isolate, |
| 22 | + Utils::OpenHandle(*v8_object))); |
| 23 | +} |
| 24 | + |
| 25 | +namespace internal { |
| 26 | + |
| 27 | +DebugPropertyIterator::DebugPropertyIterator(Isolate* isolate, |
| 28 | + Handle<JSReceiver> receiver) |
| 29 | + : isolate_(isolate), |
| 30 | + prototype_iterator_(isolate, receiver, kStartAtReceiver, |
| 31 | + PrototypeIterator::END_AT_NULL) { |
| 32 | + if (receiver->IsJSProxy()) { |
| 33 | + is_own_ = false; |
| 34 | + prototype_iterator_.AdvanceIgnoringProxies(); |
| 35 | + } |
| 36 | + if (prototype_iterator_.IsAtEnd()) return; |
| 37 | + FillKeysForCurrentPrototypeAndStage(); |
| 38 | + if (should_move_to_next_stage()) Advance(); |
| 39 | +} |
| 40 | + |
| 41 | +bool DebugPropertyIterator::Done() const { |
| 42 | + return prototype_iterator_.IsAtEnd(); |
| 43 | +} |
| 44 | + |
| 45 | +void DebugPropertyIterator::Advance() { |
| 46 | + ++current_key_index_; |
| 47 | + calculated_native_accessor_flags_ = false; |
| 48 | + while (should_move_to_next_stage()) { |
| 49 | + switch (stage_) { |
| 50 | + case Stage::kExoticIndices: |
| 51 | + stage_ = Stage::kEnumerableStrings; |
| 52 | + break; |
| 53 | + case Stage::kEnumerableStrings: |
| 54 | + stage_ = Stage::kAllProperties; |
| 55 | + break; |
| 56 | + case Stage::kAllProperties: |
| 57 | + stage_ = kExoticIndices; |
| 58 | + is_own_ = false; |
| 59 | + prototype_iterator_.AdvanceIgnoringProxies(); |
| 60 | + break; |
| 61 | + } |
| 62 | + FillKeysForCurrentPrototypeAndStage(); |
| 63 | + } |
| 64 | +} |
| 65 | + |
| 66 | +bool DebugPropertyIterator::is_native_accessor() { |
| 67 | + if (stage_ == kExoticIndices) return false; |
| 68 | + CalculateNativeAccessorFlags(); |
| 69 | + return native_accessor_flags_; |
| 70 | +} |
| 71 | + |
| 72 | +bool DebugPropertyIterator::has_native_getter() { |
| 73 | + if (stage_ == kExoticIndices) return false; |
| 74 | + CalculateNativeAccessorFlags(); |
| 75 | + return native_accessor_flags_ & |
| 76 | + static_cast<int>(debug::NativeAccessorType::HasGetter); |
| 77 | +} |
| 78 | + |
| 79 | +bool DebugPropertyIterator::has_native_setter() { |
| 80 | + if (stage_ == kExoticIndices) return false; |
| 81 | + CalculateNativeAccessorFlags(); |
| 82 | + return native_accessor_flags_ & |
| 83 | + static_cast<int>(debug::NativeAccessorType::HasSetter); |
| 84 | +} |
| 85 | + |
| 86 | +Handle<Name> DebugPropertyIterator::raw_name() const { |
| 87 | + DCHECK(!Done()); |
| 88 | + if (stage_ == kExoticIndices) { |
| 89 | + return isolate_->factory()->Uint32ToString(current_key_index_); |
| 90 | + } else { |
| 91 | + return Handle<Name>::cast( |
| 92 | + FixedArray::get(*keys_, current_key_index_, isolate_)); |
| 93 | + } |
| 94 | +} |
| 95 | + |
| 96 | +v8::Local<v8::Name> DebugPropertyIterator::name() const { |
| 97 | + return Utils::ToLocal(raw_name()); |
| 98 | +} |
| 99 | + |
| 100 | +v8::Maybe<v8::PropertyAttribute> DebugPropertyIterator::attributes() { |
| 101 | + Handle<JSReceiver> receiver = |
| 102 | + PrototypeIterator::GetCurrent<JSReceiver>(prototype_iterator_); |
| 103 | + auto result = JSReceiver::GetPropertyAttributes(receiver, raw_name()); |
| 104 | + if (result.IsNothing()) return Nothing<v8::PropertyAttribute>(); |
| 105 | + DCHECK(result.FromJust() != ABSENT); |
| 106 | + return Just(static_cast<v8::PropertyAttribute>(result.FromJust())); |
| 107 | +} |
| 108 | + |
| 109 | +v8::Maybe<v8::debug::PropertyDescriptor> DebugPropertyIterator::descriptor() { |
| 110 | + Handle<JSReceiver> receiver = |
| 111 | + PrototypeIterator::GetCurrent<JSReceiver>(prototype_iterator_); |
| 112 | + |
| 113 | + PropertyDescriptor descriptor; |
| 114 | + Maybe<bool> did_get_descriptor = JSReceiver::GetOwnPropertyDescriptor( |
| 115 | + isolate_, receiver, raw_name(), &descriptor); |
| 116 | + if (did_get_descriptor.IsNothing()) { |
| 117 | + return Nothing<v8::debug::PropertyDescriptor>(); |
| 118 | + } |
| 119 | + DCHECK(did_get_descriptor.FromJust()); |
| 120 | + return Just(v8::debug::PropertyDescriptor{ |
| 121 | + descriptor.enumerable(), descriptor.has_enumerable(), |
| 122 | + descriptor.configurable(), descriptor.has_configurable(), |
| 123 | + descriptor.writable(), descriptor.has_writable(), |
| 124 | + descriptor.has_value() ? Utils::ToLocal(descriptor.value()) |
| 125 | + : v8::Local<v8::Value>(), |
| 126 | + descriptor.has_get() ? Utils::ToLocal(descriptor.get()) |
| 127 | + : v8::Local<v8::Value>(), |
| 128 | + descriptor.has_set() ? Utils::ToLocal(descriptor.set()) |
| 129 | + : v8::Local<v8::Value>(), |
| 130 | + }); |
| 131 | +} |
| 132 | + |
| 133 | +bool DebugPropertyIterator::is_own() { return is_own_; } |
| 134 | + |
| 135 | +bool DebugPropertyIterator::is_array_index() { |
| 136 | + if (stage_ == kExoticIndices) return true; |
| 137 | + uint32_t index = 0; |
| 138 | + return raw_name()->AsArrayIndex(&index); |
| 139 | +} |
| 140 | + |
| 141 | +void DebugPropertyIterator::FillKeysForCurrentPrototypeAndStage() { |
| 142 | + current_key_index_ = 0; |
| 143 | + exotic_length_ = 0; |
| 144 | + keys_ = Handle<FixedArray>::null(); |
| 145 | + if (prototype_iterator_.IsAtEnd()) return; |
| 146 | + Handle<JSReceiver> receiver = |
| 147 | + PrototypeIterator::GetCurrent<JSReceiver>(prototype_iterator_); |
| 148 | + bool has_exotic_indices = receiver->IsJSTypedArray(); |
| 149 | + if (stage_ == kExoticIndices) { |
| 150 | + if (!has_exotic_indices) return; |
| 151 | + exotic_length_ = static_cast<uint32_t>( |
| 152 | + Handle<JSTypedArray>::cast(receiver)->length_value()); |
| 153 | + return; |
| 154 | + } |
| 155 | + bool skip_indices = has_exotic_indices; |
| 156 | + PropertyFilter filter = |
| 157 | + stage_ == kEnumerableStrings ? ENUMERABLE_STRINGS : ALL_PROPERTIES; |
| 158 | + if (!KeyAccumulator::GetKeys(receiver, KeyCollectionMode::kOwnOnly, filter, |
| 159 | + GetKeysConversion::kConvertToString, false, |
| 160 | + skip_indices) |
| 161 | + .ToHandle(&keys_)) { |
| 162 | + keys_ = Handle<FixedArray>::null(); |
| 163 | + } |
| 164 | +} |
| 165 | + |
| 166 | +bool DebugPropertyIterator::should_move_to_next_stage() const { |
| 167 | + if (prototype_iterator_.IsAtEnd()) return false; |
| 168 | + if (stage_ == kExoticIndices) return current_key_index_ >= exotic_length_; |
| 169 | + return keys_.is_null() || |
| 170 | + current_key_index_ >= static_cast<uint32_t>(keys_->length()); |
| 171 | +} |
| 172 | + |
| 173 | +namespace { |
| 174 | +base::Flags<debug::NativeAccessorType, int> GetNativeAccessorDescriptorInternal( |
| 175 | + Handle<JSReceiver> object, Handle<Name> name) { |
| 176 | + uint32_t index; |
| 177 | + if (name->AsArrayIndex(&index)) return debug::NativeAccessorType::None; |
| 178 | + LookupIterator it = |
| 179 | + LookupIterator(object->GetIsolate(), object, name, LookupIterator::OWN); |
| 180 | + if (!it.IsFound()) return debug::NativeAccessorType::None; |
| 181 | + if (it.state() != LookupIterator::ACCESSOR) { |
| 182 | + return debug::NativeAccessorType::None; |
| 183 | + } |
| 184 | + Handle<Object> structure = it.GetAccessors(); |
| 185 | + if (!structure->IsAccessorInfo()) return debug::NativeAccessorType::None; |
| 186 | + auto isolate = object->GetIsolate(); |
| 187 | + base::Flags<debug::NativeAccessorType, int> result; |
| 188 | +#define IS_BUILTIN_ACESSOR(_, name, ...) \ |
| 189 | + if (*structure == *isolate->factory()->name##_accessor()) \ |
| 190 | + return debug::NativeAccessorType::None; |
| 191 | + ACCESSOR_INFO_LIST_GENERATOR(IS_BUILTIN_ACESSOR, /* not used */) |
| 192 | +#undef IS_BUILTIN_ACESSOR |
| 193 | + Handle<AccessorInfo> accessor_info = Handle<AccessorInfo>::cast(structure); |
| 194 | + if (accessor_info->getter()) { |
| 195 | + result |= debug::NativeAccessorType::HasGetter; |
| 196 | + } |
| 197 | + if (accessor_info->setter()) { |
| 198 | + result |= debug::NativeAccessorType::HasSetter; |
| 199 | + } |
| 200 | + return result; |
| 201 | +} |
| 202 | +} // anonymous namespace |
| 203 | + |
| 204 | +void DebugPropertyIterator::CalculateNativeAccessorFlags() { |
| 205 | + if (calculated_native_accessor_flags_) return; |
| 206 | + Handle<JSReceiver> receiver = |
| 207 | + PrototypeIterator::GetCurrent<JSReceiver>(prototype_iterator_); |
| 208 | + native_accessor_flags_ = |
| 209 | + GetNativeAccessorDescriptorInternal(receiver, raw_name()); |
| 210 | + calculated_native_accessor_flags_ = true; |
| 211 | +} |
| 212 | +} // namespace internal |
| 213 | +} // namespace v8 |
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