Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 1 | // Copyright 2012 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. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4 | |
| 5 | #ifndef V8_ARGUMENTS_H_ |
| 6 | #define V8_ARGUMENTS_H_ |
| 7 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 8 | #include "src/allocation.h" |
| 9 | #include "src/isolate.h" |
Ben Murdoch | 257744e | 2011-11-30 15:57:28 +0000 | [diff] [blame] | 10 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 11 | namespace v8 { |
| 12 | namespace internal { |
| 13 | |
| 14 | // Arguments provides access to runtime call parameters. |
| 15 | // |
| 16 | // It uses the fact that the instance fields of Arguments |
| 17 | // (length_, arguments_) are "overlayed" with the parameters |
| 18 | // (no. of parameters, and the parameter pointer) passed so |
| 19 | // that inside the C++ function, the parameters passed can |
| 20 | // be accessed conveniently: |
| 21 | // |
| 22 | // Object* Runtime_function(Arguments args) { |
| 23 | // ... use args[i] here ... |
| 24 | // } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 25 | // |
| 26 | // Note that length_ (whose value is in the integer range) is defined |
| 27 | // as intptr_t to provide endian-neutrality on 64-bit archs. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 28 | |
| 29 | class Arguments BASE_EMBEDDED { |
| 30 | public: |
| 31 | Arguments(int length, Object** arguments) |
| 32 | : length_(length), arguments_(arguments) { } |
| 33 | |
| 34 | Object*& operator[] (int index) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 35 | DCHECK(0 <= index && index < length_); |
| 36 | return *(reinterpret_cast<Object**>(reinterpret_cast<intptr_t>(arguments_) - |
| 37 | index * kPointerSize)); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 38 | } |
| 39 | |
| 40 | template <class S> Handle<S> at(int index) { |
| 41 | Object** value = &((*this)[index]); |
| 42 | // This cast checks that the object we're accessing does indeed have the |
| 43 | // expected type. |
| 44 | S::cast(*value); |
| 45 | return Handle<S>(reinterpret_cast<S**>(value)); |
| 46 | } |
| 47 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame] | 48 | int smi_at(int index) { |
| 49 | return Smi::cast((*this)[index])->value(); |
| 50 | } |
| 51 | |
| 52 | double number_at(int index) { |
| 53 | return (*this)[index]->Number(); |
| 54 | } |
| 55 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 56 | // Get the total number of arguments including the receiver. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 57 | int length() const { return static_cast<int>(length_); } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 58 | |
| 59 | Object** arguments() { return arguments_; } |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 60 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 61 | private: |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 62 | intptr_t length_; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 63 | Object** arguments_; |
| 64 | }; |
| 65 | |
| 66 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 67 | // For each type of callback, we have a list of arguments |
| 68 | // They are used to generate the Call() functions below |
| 69 | // These aren't included in the list as they have duplicate signatures |
| 70 | // F(NamedPropertyEnumeratorCallback, ...) |
| 71 | |
| 72 | #define FOR_EACH_CALLBACK_TABLE_MAPPING_0(F) \ |
| 73 | F(IndexedPropertyEnumeratorCallback, v8::Array) \ |
| 74 | |
| 75 | #define FOR_EACH_CALLBACK_TABLE_MAPPING_1(F) \ |
| 76 | F(NamedPropertyGetterCallback, v8::Value, v8::Local<v8::String>) \ |
| 77 | F(AccessorNameGetterCallback, v8::Value, v8::Local<v8::Name>) \ |
| 78 | F(NamedPropertyQueryCallback, \ |
| 79 | v8::Integer, \ |
| 80 | v8::Local<v8::String>) \ |
| 81 | F(NamedPropertyDeleterCallback, \ |
| 82 | v8::Boolean, \ |
| 83 | v8::Local<v8::String>) \ |
| 84 | F(IndexedPropertyGetterCallback, \ |
| 85 | v8::Value, \ |
| 86 | uint32_t) \ |
| 87 | F(IndexedPropertyQueryCallback, \ |
| 88 | v8::Integer, \ |
| 89 | uint32_t) \ |
| 90 | F(IndexedPropertyDeleterCallback, \ |
| 91 | v8::Boolean, \ |
| 92 | uint32_t) \ |
| 93 | |
| 94 | #define FOR_EACH_CALLBACK_TABLE_MAPPING_2(F) \ |
| 95 | F(NamedPropertySetterCallback, \ |
| 96 | v8::Value, \ |
| 97 | v8::Local<v8::String>, \ |
| 98 | v8::Local<v8::Value>) \ |
| 99 | F(IndexedPropertySetterCallback, \ |
| 100 | v8::Value, \ |
| 101 | uint32_t, \ |
| 102 | v8::Local<v8::Value>) \ |
| 103 | |
| 104 | #define FOR_EACH_CALLBACK_TABLE_MAPPING_2_VOID_RETURN(F) \ |
| 105 | F(AccessorNameSetterCallback, \ |
| 106 | void, \ |
| 107 | v8::Local<v8::Name>, \ |
| 108 | v8::Local<v8::Value>) \ |
| 109 | |
| 110 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 111 | // Custom arguments replicate a small segment of stack that can be |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 112 | // accessed through an Arguments object the same way the actual stack |
| 113 | // can. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 114 | template<int kArrayLength> |
| 115 | class CustomArgumentsBase : public Relocatable { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 116 | public: |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 117 | virtual inline void IterateInstance(ObjectVisitor* v) { |
| 118 | v->VisitPointers(values_, values_ + kArrayLength); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 119 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 120 | protected: |
| 121 | inline Object** begin() { return values_; } |
| 122 | explicit inline CustomArgumentsBase(Isolate* isolate) |
| 123 | : Relocatable(isolate) {} |
| 124 | Object* values_[kArrayLength]; |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 125 | }; |
| 126 | |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 127 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 128 | template<typename T> |
| 129 | class CustomArguments : public CustomArgumentsBase<T::kArgsLength> { |
| 130 | public: |
| 131 | static const int kReturnValueOffset = T::kReturnValueIndex; |
| 132 | |
| 133 | typedef CustomArgumentsBase<T::kArgsLength> Super; |
| 134 | ~CustomArguments() { |
| 135 | this->begin()[kReturnValueOffset] = |
| 136 | reinterpret_cast<Object*>(kHandleZapValue); |
| 137 | } |
| 138 | |
| 139 | protected: |
| 140 | explicit inline CustomArguments(Isolate* isolate) : Super(isolate) {} |
| 141 | |
| 142 | template<typename V> |
| 143 | v8::Handle<V> GetReturnValue(Isolate* isolate); |
| 144 | |
| 145 | inline Isolate* isolate() { |
| 146 | return reinterpret_cast<Isolate*>(this->begin()[T::kIsolateIndex]); |
| 147 | } |
| 148 | }; |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 149 | |
| 150 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 151 | class PropertyCallbackArguments |
| 152 | : public CustomArguments<PropertyCallbackInfo<Value> > { |
| 153 | public: |
| 154 | typedef PropertyCallbackInfo<Value> T; |
| 155 | typedef CustomArguments<T> Super; |
| 156 | static const int kArgsLength = T::kArgsLength; |
| 157 | static const int kThisIndex = T::kThisIndex; |
| 158 | static const int kHolderIndex = T::kHolderIndex; |
| 159 | static const int kDataIndex = T::kDataIndex; |
| 160 | static const int kReturnValueDefaultValueIndex = |
| 161 | T::kReturnValueDefaultValueIndex; |
| 162 | static const int kIsolateIndex = T::kIsolateIndex; |
| 163 | |
| 164 | PropertyCallbackArguments(Isolate* isolate, |
| 165 | Object* data, |
| 166 | Object* self, |
| 167 | JSObject* holder) |
| 168 | : Super(isolate) { |
| 169 | Object** values = this->begin(); |
| 170 | values[T::kThisIndex] = self; |
| 171 | values[T::kHolderIndex] = holder; |
| 172 | values[T::kDataIndex] = data; |
| 173 | values[T::kIsolateIndex] = reinterpret_cast<Object*>(isolate); |
| 174 | // Here the hole is set as default value. |
| 175 | // It cannot escape into js as it's remove in Call below. |
| 176 | values[T::kReturnValueDefaultValueIndex] = |
| 177 | isolate->heap()->the_hole_value(); |
| 178 | values[T::kReturnValueIndex] = isolate->heap()->the_hole_value(); |
| 179 | DCHECK(values[T::kHolderIndex]->IsHeapObject()); |
| 180 | DCHECK(values[T::kIsolateIndex]->IsSmi()); |
| 181 | } |
| 182 | |
| 183 | /* |
| 184 | * The following Call functions wrap the calling of all callbacks to handle |
| 185 | * calling either the old or the new style callbacks depending on which one |
| 186 | * has been registered. |
| 187 | * For old callbacks which return an empty handle, the ReturnValue is checked |
| 188 | * and used if it's been set to anything inside the callback. |
| 189 | * New style callbacks always use the return value. |
| 190 | */ |
| 191 | #define WRITE_CALL_0(Function, ReturnValue) \ |
| 192 | v8::Handle<ReturnValue> Call(Function f); \ |
| 193 | |
| 194 | #define WRITE_CALL_1(Function, ReturnValue, Arg1) \ |
| 195 | v8::Handle<ReturnValue> Call(Function f, Arg1 arg1); \ |
| 196 | |
| 197 | #define WRITE_CALL_2(Function, ReturnValue, Arg1, Arg2) \ |
| 198 | v8::Handle<ReturnValue> Call(Function f, Arg1 arg1, Arg2 arg2); \ |
| 199 | |
| 200 | #define WRITE_CALL_2_VOID(Function, ReturnValue, Arg1, Arg2) \ |
| 201 | void Call(Function f, Arg1 arg1, Arg2 arg2); \ |
| 202 | |
| 203 | FOR_EACH_CALLBACK_TABLE_MAPPING_0(WRITE_CALL_0) |
| 204 | FOR_EACH_CALLBACK_TABLE_MAPPING_1(WRITE_CALL_1) |
| 205 | FOR_EACH_CALLBACK_TABLE_MAPPING_2(WRITE_CALL_2) |
| 206 | FOR_EACH_CALLBACK_TABLE_MAPPING_2_VOID_RETURN(WRITE_CALL_2_VOID) |
| 207 | |
| 208 | #undef WRITE_CALL_0 |
| 209 | #undef WRITE_CALL_1 |
| 210 | #undef WRITE_CALL_2 |
| 211 | #undef WRITE_CALL_2_VOID |
| 212 | }; |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 213 | |
| 214 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 215 | class FunctionCallbackArguments |
| 216 | : public CustomArguments<FunctionCallbackInfo<Value> > { |
| 217 | public: |
| 218 | typedef FunctionCallbackInfo<Value> T; |
| 219 | typedef CustomArguments<T> Super; |
| 220 | static const int kArgsLength = T::kArgsLength; |
| 221 | static const int kHolderIndex = T::kHolderIndex; |
| 222 | static const int kDataIndex = T::kDataIndex; |
| 223 | static const int kReturnValueDefaultValueIndex = |
| 224 | T::kReturnValueDefaultValueIndex; |
| 225 | static const int kIsolateIndex = T::kIsolateIndex; |
| 226 | static const int kCalleeIndex = T::kCalleeIndex; |
| 227 | static const int kContextSaveIndex = T::kContextSaveIndex; |
Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 228 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 229 | FunctionCallbackArguments(internal::Isolate* isolate, |
| 230 | internal::Object* data, |
| 231 | internal::JSFunction* callee, |
| 232 | internal::Object* holder, |
| 233 | internal::Object** argv, |
| 234 | int argc, |
| 235 | bool is_construct_call) |
| 236 | : Super(isolate), |
| 237 | argv_(argv), |
| 238 | argc_(argc), |
| 239 | is_construct_call_(is_construct_call) { |
| 240 | Object** values = begin(); |
| 241 | values[T::kDataIndex] = data; |
| 242 | values[T::kCalleeIndex] = callee; |
| 243 | values[T::kHolderIndex] = holder; |
| 244 | values[T::kContextSaveIndex] = isolate->heap()->the_hole_value(); |
| 245 | values[T::kIsolateIndex] = reinterpret_cast<internal::Object*>(isolate); |
| 246 | // Here the hole is set as default value. |
| 247 | // It cannot escape into js as it's remove in Call below. |
| 248 | values[T::kReturnValueDefaultValueIndex] = |
| 249 | isolate->heap()->the_hole_value(); |
| 250 | values[T::kReturnValueIndex] = isolate->heap()->the_hole_value(); |
| 251 | DCHECK(values[T::kCalleeIndex]->IsJSFunction()); |
| 252 | DCHECK(values[T::kHolderIndex]->IsHeapObject()); |
| 253 | DCHECK(values[T::kIsolateIndex]->IsSmi()); |
| 254 | } |
| 255 | |
| 256 | /* |
| 257 | * The following Call function wraps the calling of all callbacks to handle |
| 258 | * calling either the old or the new style callbacks depending on which one |
| 259 | * has been registered. |
| 260 | * For old callbacks which return an empty handle, the ReturnValue is checked |
| 261 | * and used if it's been set to anything inside the callback. |
| 262 | * New style callbacks always use the return value. |
| 263 | */ |
| 264 | v8::Handle<v8::Value> Call(FunctionCallback f); |
| 265 | |
| 266 | private: |
| 267 | internal::Object** argv_; |
| 268 | int argc_; |
| 269 | bool is_construct_call_; |
| 270 | }; |
| 271 | |
| 272 | |
| 273 | double ClobberDoubleRegisters(double x1, double x2, double x3, double x4); |
| 274 | |
| 275 | |
| 276 | #ifdef DEBUG |
| 277 | #define CLOBBER_DOUBLE_REGISTERS() ClobberDoubleRegisters(1, 2, 3, 4); |
| 278 | #else |
| 279 | #define CLOBBER_DOUBLE_REGISTERS() |
| 280 | #endif |
| 281 | |
| 282 | |
| 283 | #define DECLARE_RUNTIME_FUNCTION(Name) \ |
| 284 | Object* Name(int args_length, Object** args_object, Isolate* isolate) |
| 285 | |
| 286 | #define RUNTIME_FUNCTION_RETURNS_TYPE(Type, Name) \ |
| 287 | static INLINE(Type __RT_impl_##Name(Arguments args, Isolate* isolate)); \ |
| 288 | Type Name(int args_length, Object** args_object, Isolate* isolate) { \ |
| 289 | CLOBBER_DOUBLE_REGISTERS(); \ |
| 290 | Arguments args(args_length, args_object); \ |
| 291 | return __RT_impl_##Name(args, isolate); \ |
| 292 | } \ |
| 293 | static Type __RT_impl_##Name(Arguments args, Isolate* isolate) |
| 294 | |
| 295 | |
| 296 | #define RUNTIME_FUNCTION(Name) RUNTIME_FUNCTION_RETURNS_TYPE(Object*, Name) |
| 297 | #define RUNTIME_FUNCTION_RETURN_PAIR(Name) \ |
| 298 | RUNTIME_FUNCTION_RETURNS_TYPE(ObjectPair, Name) |
| 299 | |
| 300 | #define RUNTIME_ARGUMENTS(isolate, args) \ |
| 301 | args.length(), args.arguments(), isolate |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 302 | |
| 303 | } } // namespace v8::internal |
| 304 | |
| 305 | #endif // V8_ARGUMENTS_H_ |