| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "v8.h" |
| #include "accessors.h" |
| |
| #include "compiler.h" |
| #include "contexts.h" |
| #include "deoptimizer.h" |
| #include "execution.h" |
| #include "factory.h" |
| #include "frames-inl.h" |
| #include "isolate.h" |
| #include "list-inl.h" |
| #include "property-details.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| template <class C> |
| static C* FindInstanceOf(Isolate* isolate, Object* obj) { |
| for (Object* cur = obj; !cur->IsNull(); cur = cur->GetPrototype(isolate)) { |
| if (Is<C>(cur)) return C::cast(cur); |
| } |
| return NULL; |
| } |
| |
| |
| // Entry point that never should be called. |
| MaybeObject* Accessors::IllegalSetter(Isolate* isolate, |
| JSObject*, |
| Object*, |
| void*) { |
| UNREACHABLE(); |
| return NULL; |
| } |
| |
| |
| Object* Accessors::IllegalGetAccessor(Isolate* isolate, |
| Object* object, |
| void*) { |
| UNREACHABLE(); |
| return object; |
| } |
| |
| |
| MaybeObject* Accessors::ReadOnlySetAccessor(Isolate* isolate, |
| JSObject*, |
| Object* value, |
| void*) { |
| // According to ECMA-262, section 8.6.2.2, page 28, setting |
| // read-only properties must be silently ignored. |
| return value; |
| } |
| |
| |
| static V8_INLINE bool CheckForName(Handle<String> name, |
| String* property_name, |
| int offset, |
| int* object_offset) { |
| if (name->Equals(property_name)) { |
| *object_offset = offset; |
| return true; |
| } |
| return false; |
| } |
| |
| |
| bool Accessors::IsJSObjectFieldAccessor( |
| Handle<Map> map, Handle<String> name, |
| int* object_offset) { |
| Isolate* isolate = map->GetIsolate(); |
| switch (map->instance_type()) { |
| case JS_ARRAY_TYPE: |
| return |
| CheckForName(name, isolate->heap()->length_string(), |
| JSArray::kLengthOffset, object_offset); |
| case JS_TYPED_ARRAY_TYPE: |
| return |
| CheckForName(name, isolate->heap()->length_string(), |
| JSTypedArray::kLengthOffset, object_offset) || |
| CheckForName(name, isolate->heap()->byte_length_string(), |
| JSTypedArray::kByteLengthOffset, object_offset) || |
| CheckForName(name, isolate->heap()->byte_offset_string(), |
| JSTypedArray::kByteOffsetOffset, object_offset) || |
| CheckForName(name, isolate->heap()->buffer_string(), |
| JSTypedArray::kBufferOffset, object_offset); |
| case JS_ARRAY_BUFFER_TYPE: |
| return |
| CheckForName(name, isolate->heap()->byte_length_string(), |
| JSArrayBuffer::kByteLengthOffset, object_offset); |
| case JS_DATA_VIEW_TYPE: |
| return |
| CheckForName(name, isolate->heap()->byte_length_string(), |
| JSDataView::kByteLengthOffset, object_offset) || |
| CheckForName(name, isolate->heap()->byte_offset_string(), |
| JSDataView::kByteOffsetOffset, object_offset) || |
| CheckForName(name, isolate->heap()->buffer_string(), |
| JSDataView::kBufferOffset, object_offset); |
| default: { |
| if (map->instance_type() < FIRST_NONSTRING_TYPE) { |
| return |
| CheckForName(name, isolate->heap()->length_string(), |
| String::kLengthOffset, object_offset); |
| } |
| return false; |
| } |
| } |
| } |
| |
| |
| // |
| // Accessors::ArrayLength |
| // |
| |
| |
| MaybeObject* Accessors::ArrayGetLength(Isolate* isolate, |
| Object* object, |
| void*) { |
| // Traverse the prototype chain until we reach an array. |
| JSArray* holder = FindInstanceOf<JSArray>(isolate, object); |
| return holder == NULL ? Smi::FromInt(0) : holder->length(); |
| } |
| |
| |
| // The helper function will 'flatten' Number objects. |
| Handle<Object> Accessors::FlattenNumber(Isolate* isolate, |
| Handle<Object> value) { |
| if (value->IsNumber() || !value->IsJSValue()) return value; |
| Handle<JSValue> wrapper = Handle<JSValue>::cast(value); |
| ASSERT(wrapper->GetIsolate()->context()->native_context()->number_function()-> |
| has_initial_map()); |
| if (wrapper->map() == |
| isolate->context()->native_context()->number_function()->initial_map()) { |
| return handle(wrapper->value(), isolate); |
| } |
| |
| return value; |
| } |
| |
| |
| MaybeObject* Accessors::ArraySetLength(Isolate* isolate, |
| JSObject* object_raw, |
| Object* value_raw, |
| void*) { |
| HandleScope scope(isolate); |
| Handle<JSObject> object(object_raw, isolate); |
| Handle<Object> value(value_raw, isolate); |
| |
| // This means one of the object's prototypes is a JSArray and the |
| // object does not have a 'length' property. Calling SetProperty |
| // causes an infinite loop. |
| if (!object->IsJSArray()) { |
| Handle<Object> result = JSObject::SetLocalPropertyIgnoreAttributes(object, |
| isolate->factory()->length_string(), value, NONE); |
| RETURN_IF_EMPTY_HANDLE(isolate, result); |
| return *result; |
| } |
| |
| value = FlattenNumber(isolate, value); |
| |
| Handle<JSArray> array_handle = Handle<JSArray>::cast(object); |
| |
| bool has_exception; |
| Handle<Object> uint32_v = |
| Execution::ToUint32(isolate, value, &has_exception); |
| if (has_exception) return Failure::Exception(); |
| Handle<Object> number_v = |
| Execution::ToNumber(isolate, value, &has_exception); |
| if (has_exception) return Failure::Exception(); |
| |
| if (uint32_v->Number() == number_v->Number()) { |
| return array_handle->SetElementsLength(*uint32_v); |
| } |
| return isolate->Throw( |
| *isolate->factory()->NewRangeError("invalid_array_length", |
| HandleVector<Object>(NULL, 0))); |
| } |
| |
| |
| const AccessorDescriptor Accessors::ArrayLength = { |
| ArrayGetLength, |
| ArraySetLength, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::StringLength |
| // |
| |
| |
| MaybeObject* Accessors::StringGetLength(Isolate* isolate, |
| Object* object, |
| void*) { |
| Object* value = object; |
| if (object->IsJSValue()) value = JSValue::cast(object)->value(); |
| if (value->IsString()) return Smi::FromInt(String::cast(value)->length()); |
| // If object is not a string we return 0 to be compatible with WebKit. |
| // Note: Firefox returns the length of ToString(object). |
| return Smi::FromInt(0); |
| } |
| |
| |
| const AccessorDescriptor Accessors::StringLength = { |
| StringGetLength, |
| IllegalSetter, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::ScriptSource |
| // |
| |
| |
| MaybeObject* Accessors::ScriptGetSource(Isolate* isolate, |
| Object* object, |
| void*) { |
| Object* script = JSValue::cast(object)->value(); |
| return Script::cast(script)->source(); |
| } |
| |
| |
| const AccessorDescriptor Accessors::ScriptSource = { |
| ScriptGetSource, |
| IllegalSetter, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::ScriptName |
| // |
| |
| |
| MaybeObject* Accessors::ScriptGetName(Isolate* isolate, |
| Object* object, |
| void*) { |
| Object* script = JSValue::cast(object)->value(); |
| return Script::cast(script)->name(); |
| } |
| |
| |
| const AccessorDescriptor Accessors::ScriptName = { |
| ScriptGetName, |
| IllegalSetter, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::ScriptId |
| // |
| |
| |
| MaybeObject* Accessors::ScriptGetId(Isolate* isolate, Object* object, void*) { |
| Object* script = JSValue::cast(object)->value(); |
| return Script::cast(script)->id(); |
| } |
| |
| |
| const AccessorDescriptor Accessors::ScriptId = { |
| ScriptGetId, |
| IllegalSetter, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::ScriptLineOffset |
| // |
| |
| |
| MaybeObject* Accessors::ScriptGetLineOffset(Isolate* isolate, |
| Object* object, |
| void*) { |
| Object* script = JSValue::cast(object)->value(); |
| return Script::cast(script)->line_offset(); |
| } |
| |
| |
| const AccessorDescriptor Accessors::ScriptLineOffset = { |
| ScriptGetLineOffset, |
| IllegalSetter, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::ScriptColumnOffset |
| // |
| |
| |
| MaybeObject* Accessors::ScriptGetColumnOffset(Isolate* isolate, |
| Object* object, |
| void*) { |
| Object* script = JSValue::cast(object)->value(); |
| return Script::cast(script)->column_offset(); |
| } |
| |
| |
| const AccessorDescriptor Accessors::ScriptColumnOffset = { |
| ScriptGetColumnOffset, |
| IllegalSetter, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::ScriptData |
| // |
| |
| |
| MaybeObject* Accessors::ScriptGetData(Isolate* isolate, |
| Object* object, |
| void*) { |
| Object* script = JSValue::cast(object)->value(); |
| return Script::cast(script)->data(); |
| } |
| |
| |
| const AccessorDescriptor Accessors::ScriptData = { |
| ScriptGetData, |
| IllegalSetter, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::ScriptType |
| // |
| |
| |
| MaybeObject* Accessors::ScriptGetType(Isolate* isolate, |
| Object* object, |
| void*) { |
| Object* script = JSValue::cast(object)->value(); |
| return Script::cast(script)->type(); |
| } |
| |
| |
| const AccessorDescriptor Accessors::ScriptType = { |
| ScriptGetType, |
| IllegalSetter, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::ScriptCompilationType |
| // |
| |
| |
| MaybeObject* Accessors::ScriptGetCompilationType(Isolate* isolate, |
| Object* object, |
| void*) { |
| Object* script = JSValue::cast(object)->value(); |
| return Smi::FromInt(Script::cast(script)->compilation_type()); |
| } |
| |
| |
| const AccessorDescriptor Accessors::ScriptCompilationType = { |
| ScriptGetCompilationType, |
| IllegalSetter, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::ScriptGetLineEnds |
| // |
| |
| |
| MaybeObject* Accessors::ScriptGetLineEnds(Isolate* isolate, |
| Object* object, |
| void*) { |
| JSValue* wrapper = JSValue::cast(object); |
| HandleScope scope(isolate); |
| Handle<Script> script(Script::cast(wrapper->value()), isolate); |
| InitScriptLineEnds(script); |
| ASSERT(script->line_ends()->IsFixedArray()); |
| Handle<FixedArray> line_ends(FixedArray::cast(script->line_ends())); |
| // We do not want anyone to modify this array from JS. |
| ASSERT(*line_ends == isolate->heap()->empty_fixed_array() || |
| line_ends->map() == isolate->heap()->fixed_cow_array_map()); |
| Handle<JSArray> js_array = |
| isolate->factory()->NewJSArrayWithElements(line_ends); |
| return *js_array; |
| } |
| |
| |
| const AccessorDescriptor Accessors::ScriptLineEnds = { |
| ScriptGetLineEnds, |
| IllegalSetter, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::ScriptGetContextData |
| // |
| |
| |
| MaybeObject* Accessors::ScriptGetContextData(Isolate* isolate, |
| Object* object, |
| void*) { |
| Object* script = JSValue::cast(object)->value(); |
| return Script::cast(script)->context_data(); |
| } |
| |
| |
| const AccessorDescriptor Accessors::ScriptContextData = { |
| ScriptGetContextData, |
| IllegalSetter, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::ScriptGetEvalFromScript |
| // |
| |
| |
| MaybeObject* Accessors::ScriptGetEvalFromScript(Isolate* isolate, |
| Object* object, |
| void*) { |
| Object* script = JSValue::cast(object)->value(); |
| if (!Script::cast(script)->eval_from_shared()->IsUndefined()) { |
| Handle<SharedFunctionInfo> eval_from_shared( |
| SharedFunctionInfo::cast(Script::cast(script)->eval_from_shared())); |
| |
| if (eval_from_shared->script()->IsScript()) { |
| Handle<Script> eval_from_script(Script::cast(eval_from_shared->script())); |
| return *GetScriptWrapper(eval_from_script); |
| } |
| } |
| return isolate->heap()->undefined_value(); |
| } |
| |
| |
| const AccessorDescriptor Accessors::ScriptEvalFromScript = { |
| ScriptGetEvalFromScript, |
| IllegalSetter, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::ScriptGetEvalFromScriptPosition |
| // |
| |
| |
| MaybeObject* Accessors::ScriptGetEvalFromScriptPosition(Isolate* isolate, |
| Object* object, |
| void*) { |
| Script* raw_script = Script::cast(JSValue::cast(object)->value()); |
| HandleScope scope(isolate); |
| Handle<Script> script(raw_script); |
| |
| // If this is not a script compiled through eval there is no eval position. |
| if (script->compilation_type() != Script::COMPILATION_TYPE_EVAL) { |
| return script->GetHeap()->undefined_value(); |
| } |
| |
| // Get the function from where eval was called and find the source position |
| // from the instruction offset. |
| Handle<Code> code(SharedFunctionInfo::cast( |
| script->eval_from_shared())->code()); |
| return Smi::FromInt(code->SourcePosition(code->instruction_start() + |
| script->eval_from_instructions_offset()->value())); |
| } |
| |
| |
| const AccessorDescriptor Accessors::ScriptEvalFromScriptPosition = { |
| ScriptGetEvalFromScriptPosition, |
| IllegalSetter, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::ScriptGetEvalFromFunctionName |
| // |
| |
| |
| MaybeObject* Accessors::ScriptGetEvalFromFunctionName(Isolate* isolate, |
| Object* object, |
| void*) { |
| Object* script = JSValue::cast(object)->value(); |
| Handle<SharedFunctionInfo> shared(SharedFunctionInfo::cast( |
| Script::cast(script)->eval_from_shared())); |
| |
| |
| // Find the name of the function calling eval. |
| if (!shared->name()->IsUndefined()) { |
| return shared->name(); |
| } else { |
| return shared->inferred_name(); |
| } |
| } |
| |
| |
| const AccessorDescriptor Accessors::ScriptEvalFromFunctionName = { |
| ScriptGetEvalFromFunctionName, |
| IllegalSetter, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::FunctionPrototype |
| // |
| |
| |
| Handle<Object> Accessors::FunctionGetPrototype(Handle<JSFunction> function) { |
| CALL_HEAP_FUNCTION(function->GetIsolate(), |
| Accessors::FunctionGetPrototype(function->GetIsolate(), |
| *function, |
| NULL), |
| Object); |
| } |
| |
| |
| Handle<Object> Accessors::FunctionSetPrototype(Handle<JSFunction> function, |
| Handle<Object> prototype) { |
| ASSERT(function->should_have_prototype()); |
| CALL_HEAP_FUNCTION(function->GetIsolate(), |
| Accessors::FunctionSetPrototype(function->GetIsolate(), |
| *function, |
| *prototype, |
| NULL), |
| Object); |
| } |
| |
| |
| MaybeObject* Accessors::FunctionGetPrototype(Isolate* isolate, |
| Object* object, |
| void*) { |
| JSFunction* function_raw = FindInstanceOf<JSFunction>(isolate, object); |
| if (function_raw == NULL) return isolate->heap()->undefined_value(); |
| while (!function_raw->should_have_prototype()) { |
| function_raw = FindInstanceOf<JSFunction>(isolate, |
| function_raw->GetPrototype()); |
| // There has to be one because we hit the getter. |
| ASSERT(function_raw != NULL); |
| } |
| |
| if (!function_raw->has_prototype()) { |
| HandleScope scope(isolate); |
| Handle<JSFunction> function(function_raw); |
| Handle<Object> proto = isolate->factory()->NewFunctionPrototype(function); |
| JSFunction::SetPrototype(function, proto); |
| function_raw = *function; |
| } |
| return function_raw->prototype(); |
| } |
| |
| |
| MaybeObject* Accessors::FunctionSetPrototype(Isolate* isolate, |
| JSObject* object_raw, |
| Object* value_raw, |
| void*) { |
| JSFunction* function_raw = FindInstanceOf<JSFunction>(isolate, object_raw); |
| if (function_raw == NULL) return isolate->heap()->undefined_value(); |
| |
| HandleScope scope(isolate); |
| Handle<JSFunction> function(function_raw, isolate); |
| Handle<JSObject> object(object_raw, isolate); |
| Handle<Object> value(value_raw, isolate); |
| if (!function->should_have_prototype()) { |
| // Since we hit this accessor, object will have no prototype property. |
| Handle<Object> result = JSObject::SetLocalPropertyIgnoreAttributes(object, |
| isolate->factory()->prototype_string(), value, NONE); |
| RETURN_IF_EMPTY_HANDLE(isolate, result); |
| return *result; |
| } |
| |
| Handle<Object> old_value; |
| bool is_observed = |
| FLAG_harmony_observation && |
| *function == *object && |
| function->map()->is_observed(); |
| if (is_observed) { |
| if (function->has_prototype()) |
| old_value = handle(function->prototype(), isolate); |
| else |
| old_value = isolate->factory()->NewFunctionPrototype(function); |
| } |
| |
| JSFunction::SetPrototype(function, value); |
| ASSERT(function->prototype() == *value); |
| |
| if (is_observed && !old_value->SameValue(*value)) { |
| JSObject::EnqueueChangeRecord( |
| function, "update", isolate->factory()->prototype_string(), old_value); |
| } |
| |
| return *function; |
| } |
| |
| |
| const AccessorDescriptor Accessors::FunctionPrototype = { |
| FunctionGetPrototype, |
| FunctionSetPrototype, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::FunctionLength |
| // |
| |
| |
| MaybeObject* Accessors::FunctionGetLength(Isolate* isolate, |
| Object* object, |
| void*) { |
| JSFunction* function = FindInstanceOf<JSFunction>(isolate, object); |
| if (function == NULL) return Smi::FromInt(0); |
| // Check if already compiled. |
| if (function->shared()->is_compiled()) { |
| return Smi::FromInt(function->shared()->length()); |
| } |
| // If the function isn't compiled yet, the length is not computed correctly |
| // yet. Compile it now and return the right length. |
| HandleScope scope(isolate); |
| Handle<JSFunction> function_handle(function); |
| if (Compiler::EnsureCompiled(function_handle, KEEP_EXCEPTION)) { |
| return Smi::FromInt(function_handle->shared()->length()); |
| } |
| return Failure::Exception(); |
| } |
| |
| |
| const AccessorDescriptor Accessors::FunctionLength = { |
| FunctionGetLength, |
| ReadOnlySetAccessor, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::FunctionName |
| // |
| |
| |
| MaybeObject* Accessors::FunctionGetName(Isolate* isolate, |
| Object* object, |
| void*) { |
| JSFunction* holder = FindInstanceOf<JSFunction>(isolate, object); |
| return holder == NULL |
| ? isolate->heap()->undefined_value() |
| : holder->shared()->name(); |
| } |
| |
| |
| const AccessorDescriptor Accessors::FunctionName = { |
| FunctionGetName, |
| ReadOnlySetAccessor, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::FunctionArguments |
| // |
| |
| |
| Handle<Object> Accessors::FunctionGetArguments(Handle<JSFunction> function) { |
| CALL_HEAP_FUNCTION(function->GetIsolate(), |
| Accessors::FunctionGetArguments(function->GetIsolate(), |
| *function, |
| NULL), |
| Object); |
| } |
| |
| |
| static MaybeObject* ConstructArgumentsObjectForInlinedFunction( |
| JavaScriptFrame* frame, |
| Handle<JSFunction> inlined_function, |
| int inlined_frame_index) { |
| Isolate* isolate = inlined_function->GetIsolate(); |
| Factory* factory = isolate->factory(); |
| Vector<SlotRef> args_slots = |
| SlotRef::ComputeSlotMappingForArguments( |
| frame, |
| inlined_frame_index, |
| inlined_function->shared()->formal_parameter_count()); |
| int args_count = args_slots.length(); |
| Handle<JSObject> arguments = |
| factory->NewArgumentsObject(inlined_function, args_count); |
| Handle<FixedArray> array = factory->NewFixedArray(args_count); |
| for (int i = 0; i < args_count; ++i) { |
| Handle<Object> value = args_slots[i].GetValue(isolate); |
| array->set(i, *value); |
| } |
| arguments->set_elements(*array); |
| args_slots.Dispose(); |
| |
| // Return the freshly allocated arguments object. |
| return *arguments; |
| } |
| |
| |
| MaybeObject* Accessors::FunctionGetArguments(Isolate* isolate, |
| Object* object, |
| void*) { |
| HandleScope scope(isolate); |
| JSFunction* holder = FindInstanceOf<JSFunction>(isolate, object); |
| if (holder == NULL) return isolate->heap()->undefined_value(); |
| Handle<JSFunction> function(holder, isolate); |
| |
| if (function->shared()->native()) return isolate->heap()->null_value(); |
| // Find the top invocation of the function by traversing frames. |
| List<JSFunction*> functions(2); |
| for (JavaScriptFrameIterator it(isolate); !it.done(); it.Advance()) { |
| JavaScriptFrame* frame = it.frame(); |
| frame->GetFunctions(&functions); |
| for (int i = functions.length() - 1; i >= 0; i--) { |
| // Skip all frames that aren't invocations of the given function. |
| if (functions[i] != *function) continue; |
| |
| if (i > 0) { |
| // The function in question was inlined. Inlined functions have the |
| // correct number of arguments and no allocated arguments object, so |
| // we can construct a fresh one by interpreting the function's |
| // deoptimization input data. |
| return ConstructArgumentsObjectForInlinedFunction(frame, function, i); |
| } |
| |
| if (!frame->is_optimized()) { |
| // If there is an arguments variable in the stack, we return that. |
| Handle<ScopeInfo> scope_info(function->shared()->scope_info()); |
| int index = scope_info->StackSlotIndex( |
| isolate->heap()->arguments_string()); |
| if (index >= 0) { |
| Handle<Object> arguments(frame->GetExpression(index), isolate); |
| if (!arguments->IsArgumentsMarker()) return *arguments; |
| } |
| } |
| |
| // If there is no arguments variable in the stack or we have an |
| // optimized frame, we find the frame that holds the actual arguments |
| // passed to the function. |
| it.AdvanceToArgumentsFrame(); |
| frame = it.frame(); |
| |
| // Get the number of arguments and construct an arguments object |
| // mirror for the right frame. |
| const int length = frame->ComputeParametersCount(); |
| Handle<JSObject> arguments = isolate->factory()->NewArgumentsObject( |
| function, length); |
| Handle<FixedArray> array = isolate->factory()->NewFixedArray(length); |
| |
| // Copy the parameters to the arguments object. |
| ASSERT(array->length() == length); |
| for (int i = 0; i < length; i++) array->set(i, frame->GetParameter(i)); |
| arguments->set_elements(*array); |
| |
| // Return the freshly allocated arguments object. |
| return *arguments; |
| } |
| functions.Rewind(0); |
| } |
| |
| // No frame corresponding to the given function found. Return null. |
| return isolate->heap()->null_value(); |
| } |
| |
| |
| const AccessorDescriptor Accessors::FunctionArguments = { |
| FunctionGetArguments, |
| ReadOnlySetAccessor, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::FunctionCaller |
| // |
| |
| |
| class FrameFunctionIterator { |
| public: |
| FrameFunctionIterator(Isolate* isolate, const DisallowHeapAllocation& promise) |
| : frame_iterator_(isolate), |
| functions_(2), |
| index_(0) { |
| GetFunctions(); |
| } |
| JSFunction* next() { |
| if (functions_.length() == 0) return NULL; |
| JSFunction* next_function = functions_[index_]; |
| index_--; |
| if (index_ < 0) { |
| GetFunctions(); |
| } |
| return next_function; |
| } |
| |
| // Iterate through functions until the first occurence of 'function'. |
| // Returns true if 'function' is found, and false if the iterator ends |
| // without finding it. |
| bool Find(JSFunction* function) { |
| JSFunction* next_function; |
| do { |
| next_function = next(); |
| if (next_function == function) return true; |
| } while (next_function != NULL); |
| return false; |
| } |
| |
| private: |
| void GetFunctions() { |
| functions_.Rewind(0); |
| if (frame_iterator_.done()) return; |
| JavaScriptFrame* frame = frame_iterator_.frame(); |
| frame->GetFunctions(&functions_); |
| ASSERT(functions_.length() > 0); |
| frame_iterator_.Advance(); |
| index_ = functions_.length() - 1; |
| } |
| JavaScriptFrameIterator frame_iterator_; |
| List<JSFunction*> functions_; |
| int index_; |
| }; |
| |
| |
| MaybeObject* Accessors::FunctionGetCaller(Isolate* isolate, |
| Object* object, |
| void*) { |
| HandleScope scope(isolate); |
| DisallowHeapAllocation no_allocation; |
| JSFunction* holder = FindInstanceOf<JSFunction>(isolate, object); |
| if (holder == NULL) return isolate->heap()->undefined_value(); |
| if (holder->shared()->native()) return isolate->heap()->null_value(); |
| Handle<JSFunction> function(holder, isolate); |
| |
| FrameFunctionIterator it(isolate, no_allocation); |
| |
| // Find the function from the frames. |
| if (!it.Find(*function)) { |
| // No frame corresponding to the given function found. Return null. |
| return isolate->heap()->null_value(); |
| } |
| |
| // Find previously called non-toplevel function. |
| JSFunction* caller; |
| do { |
| caller = it.next(); |
| if (caller == NULL) return isolate->heap()->null_value(); |
| } while (caller->shared()->is_toplevel()); |
| |
| // If caller is a built-in function and caller's caller is also built-in, |
| // use that instead. |
| JSFunction* potential_caller = caller; |
| while (potential_caller != NULL && potential_caller->IsBuiltin()) { |
| caller = potential_caller; |
| potential_caller = it.next(); |
| } |
| if (!caller->shared()->native() && potential_caller != NULL) { |
| caller = potential_caller; |
| } |
| // If caller is bound, return null. This is compatible with JSC, and |
| // allows us to make bound functions use the strict function map |
| // and its associated throwing caller and arguments. |
| if (caller->shared()->bound()) { |
| return isolate->heap()->null_value(); |
| } |
| // Censor if the caller is not a classic mode function. |
| // Change from ES5, which used to throw, see: |
| // https://bugs.ecmascript.org/show_bug.cgi?id=310 |
| if (!caller->shared()->is_classic_mode()) { |
| return isolate->heap()->null_value(); |
| } |
| |
| return caller; |
| } |
| |
| |
| const AccessorDescriptor Accessors::FunctionCaller = { |
| FunctionGetCaller, |
| ReadOnlySetAccessor, |
| 0 |
| }; |
| |
| |
| // |
| // Accessors::MakeModuleExport |
| // |
| |
| static void ModuleGetExport( |
| v8::Local<v8::String> property, |
| const v8::PropertyCallbackInfo<v8::Value>& info) { |
| JSModule* instance = JSModule::cast(*v8::Utils::OpenHandle(*info.Holder())); |
| Context* context = Context::cast(instance->context()); |
| ASSERT(context->IsModuleContext()); |
| int slot = info.Data()->Int32Value(); |
| Object* value = context->get(slot); |
| Isolate* isolate = instance->GetIsolate(); |
| if (value->IsTheHole()) { |
| Handle<String> name = v8::Utils::OpenHandle(*property); |
| isolate->ScheduleThrow( |
| *isolate->factory()->NewReferenceError("not_defined", |
| HandleVector(&name, 1))); |
| return; |
| } |
| info.GetReturnValue().Set(v8::Utils::ToLocal(Handle<Object>(value, isolate))); |
| } |
| |
| |
| static void ModuleSetExport( |
| v8::Local<v8::String> property, |
| v8::Local<v8::Value> value, |
| const v8::PropertyCallbackInfo<v8::Value>& info) { |
| JSModule* instance = JSModule::cast(*v8::Utils::OpenHandle(*info.Holder())); |
| Context* context = Context::cast(instance->context()); |
| ASSERT(context->IsModuleContext()); |
| int slot = info.Data()->Int32Value(); |
| Object* old_value = context->get(slot); |
| if (old_value->IsTheHole()) { |
| Handle<String> name = v8::Utils::OpenHandle(*property); |
| Isolate* isolate = instance->GetIsolate(); |
| isolate->ScheduleThrow( |
| *isolate->factory()->NewReferenceError("not_defined", |
| HandleVector(&name, 1))); |
| return; |
| } |
| context->set(slot, *v8::Utils::OpenHandle(*value)); |
| } |
| |
| |
| Handle<AccessorInfo> Accessors::MakeModuleExport( |
| Handle<String> name, |
| int index, |
| PropertyAttributes attributes) { |
| Isolate* isolate = name->GetIsolate(); |
| Factory* factory = isolate->factory(); |
| Handle<ExecutableAccessorInfo> info = factory->NewExecutableAccessorInfo(); |
| info->set_property_attributes(attributes); |
| info->set_all_can_read(true); |
| info->set_all_can_write(true); |
| info->set_name(*name); |
| info->set_data(Smi::FromInt(index)); |
| Handle<Object> getter = v8::FromCData(isolate, &ModuleGetExport); |
| Handle<Object> setter = v8::FromCData(isolate, &ModuleSetExport); |
| info->set_getter(*getter); |
| if (!(attributes & ReadOnly)) info->set_setter(*setter); |
| return info; |
| } |
| |
| |
| } } // namespace v8::internal |