Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 1 | // Copyright 2016 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 | #ifndef V8_API_ARGUMENTS_H_ |
| 6 | #define V8_API_ARGUMENTS_H_ |
| 7 | |
| 8 | #include "src/api.h" |
| 9 | #include "src/isolate.h" |
| 10 | #include "src/tracing/trace-event.h" |
| 11 | #include "src/vm-state-inl.h" |
| 12 | |
| 13 | namespace v8 { |
| 14 | namespace internal { |
| 15 | |
| 16 | // Custom arguments replicate a small segment of stack that can be |
| 17 | // accessed through an Arguments object the same way the actual stack |
| 18 | // can. |
| 19 | template <int kArrayLength> |
| 20 | class CustomArgumentsBase : public Relocatable { |
| 21 | public: |
| 22 | virtual inline void IterateInstance(ObjectVisitor* v) { |
| 23 | v->VisitPointers(values_, values_ + kArrayLength); |
| 24 | } |
| 25 | |
| 26 | protected: |
| 27 | inline Object** begin() { return values_; } |
| 28 | explicit inline CustomArgumentsBase(Isolate* isolate) |
| 29 | : Relocatable(isolate) {} |
| 30 | Object* values_[kArrayLength]; |
| 31 | }; |
| 32 | |
| 33 | template <typename T> |
| 34 | class CustomArguments : public CustomArgumentsBase<T::kArgsLength> { |
| 35 | public: |
| 36 | static const int kReturnValueOffset = T::kReturnValueIndex; |
| 37 | |
| 38 | typedef CustomArgumentsBase<T::kArgsLength> Super; |
| 39 | ~CustomArguments() { |
| 40 | this->begin()[kReturnValueOffset] = |
| 41 | reinterpret_cast<Object*>(kHandleZapValue); |
| 42 | } |
| 43 | |
| 44 | protected: |
| 45 | explicit inline CustomArguments(Isolate* isolate) : Super(isolate) {} |
| 46 | |
| 47 | template <typename V> |
| 48 | Handle<V> GetReturnValue(Isolate* isolate); |
| 49 | |
| 50 | inline Isolate* isolate() { |
| 51 | return reinterpret_cast<Isolate*>(this->begin()[T::kIsolateIndex]); |
| 52 | } |
| 53 | }; |
| 54 | |
| 55 | template <typename T> |
| 56 | template <typename V> |
| 57 | Handle<V> CustomArguments<T>::GetReturnValue(Isolate* isolate) { |
| 58 | // Check the ReturnValue. |
| 59 | Object** handle = &this->begin()[kReturnValueOffset]; |
| 60 | // Nothing was set, return empty handle as per previous behaviour. |
| 61 | if ((*handle)->IsTheHole()) return Handle<V>(); |
| 62 | Handle<V> result = Handle<V>::cast(Handle<Object>(handle)); |
| 63 | result->VerifyApiCallResultType(); |
| 64 | return result; |
| 65 | } |
| 66 | |
| 67 | class PropertyCallbackArguments |
| 68 | : public CustomArguments<PropertyCallbackInfo<Value> > { |
| 69 | public: |
| 70 | typedef PropertyCallbackInfo<Value> T; |
| 71 | typedef CustomArguments<T> Super; |
| 72 | static const int kArgsLength = T::kArgsLength; |
| 73 | static const int kThisIndex = T::kThisIndex; |
| 74 | static const int kHolderIndex = T::kHolderIndex; |
| 75 | static const int kDataIndex = T::kDataIndex; |
| 76 | static const int kReturnValueDefaultValueIndex = |
| 77 | T::kReturnValueDefaultValueIndex; |
| 78 | static const int kIsolateIndex = T::kIsolateIndex; |
| 79 | static const int kShouldThrowOnErrorIndex = T::kShouldThrowOnErrorIndex; |
| 80 | |
| 81 | PropertyCallbackArguments(Isolate* isolate, Object* data, Object* self, |
| 82 | JSObject* holder, Object::ShouldThrow should_throw) |
| 83 | : Super(isolate) { |
| 84 | Object** values = this->begin(); |
| 85 | values[T::kThisIndex] = self; |
| 86 | values[T::kHolderIndex] = holder; |
| 87 | values[T::kDataIndex] = data; |
| 88 | values[T::kIsolateIndex] = reinterpret_cast<Object*>(isolate); |
| 89 | values[T::kShouldThrowOnErrorIndex] = |
| 90 | Smi::FromInt(should_throw == Object::THROW_ON_ERROR ? 1 : 0); |
| 91 | |
| 92 | // Here the hole is set as default value. |
| 93 | // It cannot escape into js as it's remove in Call below. |
| 94 | values[T::kReturnValueDefaultValueIndex] = |
| 95 | isolate->heap()->the_hole_value(); |
| 96 | values[T::kReturnValueIndex] = isolate->heap()->the_hole_value(); |
| 97 | DCHECK(values[T::kHolderIndex]->IsHeapObject()); |
| 98 | DCHECK(values[T::kIsolateIndex]->IsSmi()); |
| 99 | } |
| 100 | |
| 101 | /* |
| 102 | * The following Call functions wrap the calling of all callbacks to handle |
| 103 | * calling either the old or the new style callbacks depending on which one |
| 104 | * has been registered. |
| 105 | * For old callbacks which return an empty handle, the ReturnValue is checked |
| 106 | * and used if it's been set to anything inside the callback. |
| 107 | * New style callbacks always use the return value. |
| 108 | */ |
| 109 | Handle<JSObject> Call(IndexedPropertyEnumeratorCallback f); |
| 110 | |
| 111 | #define FOR_EACH_CALLBACK_TABLE_MAPPING_1_NAME(F) \ |
| 112 | F(AccessorNameGetterCallback, "get", v8::Value, Object) \ |
| 113 | F(GenericNamedPropertyQueryCallback, "has", v8::Integer, Object) \ |
| 114 | F(GenericNamedPropertyDeleterCallback, "delete", v8::Boolean, Object) |
| 115 | |
| 116 | #define WRITE_CALL_1_NAME(Function, type, ApiReturn, InternalReturn) \ |
| 117 | Handle<InternalReturn> Call(Function f, Handle<Name> name) { \ |
| 118 | Isolate* isolate = this->isolate(); \ |
| 119 | VMState<EXTERNAL> state(isolate); \ |
| 120 | ExternalCallbackScope call_scope(isolate, FUNCTION_ADDR(f)); \ |
| 121 | PropertyCallbackInfo<ApiReturn> info(begin()); \ |
| 122 | LOG(isolate, \ |
| 123 | ApiNamedPropertyAccess("interceptor-named-" type, holder(), *name)); \ |
| 124 | f(v8::Utils::ToLocal(name), info); \ |
| 125 | return GetReturnValue<InternalReturn>(isolate); \ |
| 126 | } |
| 127 | |
| 128 | FOR_EACH_CALLBACK_TABLE_MAPPING_1_NAME(WRITE_CALL_1_NAME) |
| 129 | |
| 130 | #undef FOR_EACH_CALLBACK_TABLE_MAPPING_1_NAME |
| 131 | #undef WRITE_CALL_1_NAME |
| 132 | |
| 133 | #define FOR_EACH_CALLBACK_TABLE_MAPPING_1_INDEX(F) \ |
| 134 | F(IndexedPropertyGetterCallback, "get", v8::Value, Object) \ |
| 135 | F(IndexedPropertyQueryCallback, "has", v8::Integer, Object) \ |
| 136 | F(IndexedPropertyDeleterCallback, "delete", v8::Boolean, Object) |
| 137 | |
| 138 | #define WRITE_CALL_1_INDEX(Function, type, ApiReturn, InternalReturn) \ |
| 139 | Handle<InternalReturn> Call(Function f, uint32_t index) { \ |
| 140 | Isolate* isolate = this->isolate(); \ |
| 141 | VMState<EXTERNAL> state(isolate); \ |
| 142 | ExternalCallbackScope call_scope(isolate, FUNCTION_ADDR(f)); \ |
| 143 | PropertyCallbackInfo<ApiReturn> info(begin()); \ |
| 144 | LOG(isolate, ApiIndexedPropertyAccess("interceptor-indexed-" type, \ |
| 145 | holder(), index)); \ |
| 146 | f(index, info); \ |
| 147 | return GetReturnValue<InternalReturn>(isolate); \ |
| 148 | } |
| 149 | |
| 150 | FOR_EACH_CALLBACK_TABLE_MAPPING_1_INDEX(WRITE_CALL_1_INDEX) |
| 151 | |
| 152 | #undef FOR_EACH_CALLBACK_TABLE_MAPPING_1_INDEX |
| 153 | #undef WRITE_CALL_1_INDEX |
| 154 | |
| 155 | Handle<Object> Call(GenericNamedPropertySetterCallback f, Handle<Name> name, |
| 156 | Handle<Object> value) { |
| 157 | Isolate* isolate = this->isolate(); |
| 158 | VMState<EXTERNAL> state(isolate); |
| 159 | ExternalCallbackScope call_scope(isolate, FUNCTION_ADDR(f)); |
| 160 | PropertyCallbackInfo<v8::Value> info(begin()); |
| 161 | LOG(isolate, |
| 162 | ApiNamedPropertyAccess("interceptor-named-set", holder(), *name)); |
| 163 | f(v8::Utils::ToLocal(name), v8::Utils::ToLocal(value), info); |
| 164 | return GetReturnValue<Object>(isolate); |
| 165 | } |
| 166 | |
| 167 | Handle<Object> Call(IndexedPropertySetterCallback f, uint32_t index, |
| 168 | Handle<Object> value) { |
| 169 | Isolate* isolate = this->isolate(); |
| 170 | VMState<EXTERNAL> state(isolate); |
| 171 | ExternalCallbackScope call_scope(isolate, FUNCTION_ADDR(f)); |
| 172 | PropertyCallbackInfo<v8::Value> info(begin()); |
| 173 | LOG(isolate, |
| 174 | ApiIndexedPropertyAccess("interceptor-indexed-set", holder(), index)); |
| 175 | f(index, v8::Utils::ToLocal(value), info); |
| 176 | return GetReturnValue<Object>(isolate); |
| 177 | } |
| 178 | |
| 179 | void Call(AccessorNameSetterCallback f, Handle<Name> name, |
| 180 | Handle<Object> value) { |
| 181 | Isolate* isolate = this->isolate(); |
| 182 | VMState<EXTERNAL> state(isolate); |
| 183 | ExternalCallbackScope call_scope(isolate, FUNCTION_ADDR(f)); |
| 184 | PropertyCallbackInfo<void> info(begin()); |
| 185 | LOG(isolate, |
| 186 | ApiNamedPropertyAccess("interceptor-named-set", holder(), *name)); |
| 187 | f(v8::Utils::ToLocal(name), v8::Utils::ToLocal(value), info); |
| 188 | } |
| 189 | |
| 190 | private: |
| 191 | inline JSObject* holder() { |
| 192 | return JSObject::cast(this->begin()[T::kHolderIndex]); |
| 193 | } |
| 194 | }; |
| 195 | |
| 196 | class FunctionCallbackArguments |
| 197 | : public CustomArguments<FunctionCallbackInfo<Value> > { |
| 198 | public: |
| 199 | typedef FunctionCallbackInfo<Value> T; |
| 200 | typedef CustomArguments<T> Super; |
| 201 | static const int kArgsLength = T::kArgsLength; |
| 202 | static const int kHolderIndex = T::kHolderIndex; |
| 203 | static const int kDataIndex = T::kDataIndex; |
| 204 | static const int kReturnValueDefaultValueIndex = |
| 205 | T::kReturnValueDefaultValueIndex; |
| 206 | static const int kIsolateIndex = T::kIsolateIndex; |
| 207 | static const int kCalleeIndex = T::kCalleeIndex; |
| 208 | static const int kContextSaveIndex = T::kContextSaveIndex; |
| 209 | |
| 210 | FunctionCallbackArguments(internal::Isolate* isolate, internal::Object* data, |
| 211 | internal::HeapObject* callee, |
| 212 | internal::Object* holder, internal::Object** argv, |
| 213 | int argc, bool is_construct_call) |
| 214 | : Super(isolate), |
| 215 | argv_(argv), |
| 216 | argc_(argc), |
| 217 | is_construct_call_(is_construct_call) { |
| 218 | Object** values = begin(); |
| 219 | values[T::kDataIndex] = data; |
| 220 | values[T::kCalleeIndex] = callee; |
| 221 | values[T::kHolderIndex] = holder; |
| 222 | values[T::kContextSaveIndex] = isolate->heap()->the_hole_value(); |
| 223 | values[T::kIsolateIndex] = reinterpret_cast<internal::Object*>(isolate); |
| 224 | // Here the hole is set as default value. |
| 225 | // It cannot escape into js as it's remove in Call below. |
| 226 | values[T::kReturnValueDefaultValueIndex] = |
| 227 | isolate->heap()->the_hole_value(); |
| 228 | values[T::kReturnValueIndex] = isolate->heap()->the_hole_value(); |
| 229 | DCHECK(values[T::kCalleeIndex]->IsJSFunction() || |
| 230 | values[T::kCalleeIndex]->IsFunctionTemplateInfo()); |
| 231 | DCHECK(values[T::kHolderIndex]->IsHeapObject()); |
| 232 | DCHECK(values[T::kIsolateIndex]->IsSmi()); |
| 233 | } |
| 234 | |
| 235 | /* |
| 236 | * The following Call function wraps the calling of all callbacks to handle |
| 237 | * calling either the old or the new style callbacks depending on which one |
| 238 | * has been registered. |
| 239 | * For old callbacks which return an empty handle, the ReturnValue is checked |
| 240 | * and used if it's been set to anything inside the callback. |
| 241 | * New style callbacks always use the return value. |
| 242 | */ |
| 243 | Handle<Object> Call(FunctionCallback f); |
| 244 | |
| 245 | private: |
| 246 | internal::Object** argv_; |
| 247 | int argc_; |
| 248 | bool is_construct_call_; |
| 249 | }; |
| 250 | |
| 251 | } // namespace internal |
| 252 | } // namespace v8 |
| 253 | |
| 254 | #endif // V8_API_ARGUMENTS_H_ |