Implement Function.apply in vm (issue 5670).

runtime/vm/object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 3172 matching lines @@
   bool IsValidNativeIndex(int index) const {
     return ((index >= 0) && (index < clazz()->ptr()->num_native_fields_));
   }
 
   inline intptr_t GetNativeField(Isolate* isolate, int index) const;
   void SetNativeField(int index, intptr_t value) const;
 
   // Returns true if the instance is a closure object.
   bool IsClosure() const;
 
+  // If the instance is a callable object, i.e. a closure or the instance of a
+  // class implementing a 'call' method, return true and set the function
+  // (if not NULL) to call and the context (if not NULL) to pass to the
+  // function.
+  bool IsCallable(Function* function, Context* context) const;
+
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawInstance));
   }
 
   static RawInstance* New(const Class& cls, Heap::Space space = Heap::kNew);
 
  private:
   RawObject** FieldAddrAtOffset(intptr_t offset) const {
     ASSERT(IsValidFieldOffset(offset));
     return reinterpret_cast<RawObject**>(raw_value() - kHeapObjectTag + offset);
@@ skipping 2965 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_