Support redirecting factory constructors in the VM (issue 3969).

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 248 matching lines @@
   static RawClass* unresolved_class_class() { return unresolved_class_class_; }
   static RawClass* type_class() { return type_class_; }
   static RawClass* type_parameter_class() { return type_parameter_class_; }
   static RawClass* type_arguments_class() { return type_arguments_class_; }
   static RawClass* instantiated_type_arguments_class() {
       return instantiated_type_arguments_class_;
   }
   static RawClass* patch_class_class() { return patch_class_class_; }
   static RawClass* function_class() { return function_class_; }
   static RawClass* closure_data_class() { return closure_data_class_; }
+  static RawClass* redirection_data_class() { return redirection_data_class_; }
   static RawClass* field_class() { return field_class_; }
   static RawClass* literal_token_class() { return literal_token_class_; }
   static RawClass* token_stream_class() { return token_stream_class_; }
   static RawClass* script_class() { return script_class_; }
   static RawClass* library_class() { return library_class_; }
   static RawClass* library_prefix_class() { return library_prefix_class_; }
   static RawClass* code_class() { return code_class_; }
   static RawClass* instructions_class() { return instructions_class_; }
   static RawClass* pc_descriptors_class() { return pc_descriptors_class_; }
   static RawClass* stackmap_class() { return stackmap_class_; }
@@ skipping 111 matching lines @@
   static RawClass* void_class_;  // Class of the 'void' type.
   static RawClass* unresolved_class_class_;  // Class of UnresolvedClass.
   static RawClass* type_class_;  // Class of Type.
   static RawClass* type_parameter_class_;  // Class of TypeParameter vm object.
   // Class of the TypeArguments vm object.
   static RawClass* type_arguments_class_;
   static RawClass* instantiated_type_arguments_class_;  // Class of Inst..ments.
   static RawClass* patch_class_class_;  // Class of the PatchClass vm object.
   static RawClass* function_class_;  // Class of the Function vm object.
   static RawClass* closure_data_class_;  // Class of ClosureData vm obj.
+  static RawClass* redirection_data_class_;  // Class of RedirectionData vm obj.
   static RawClass* field_class_;  // Class of the Field vm object.
   static RawClass* literal_token_class_;  // Class of LiteralToken vm object.
   static RawClass* token_stream_class_;  // Class of the TokenStream vm object.
   static RawClass* script_class_;  // Class of the Script vm object.
   static RawClass* library_class_;  // Class of the Library vm object.
   static RawClass* library_prefix_class_;  // Class of Library prefix vm object.
   static RawClass* code_class_;  // Class of the Code vm object.
   static RawClass* instructions_class_;  // Class of the Instructions vm object.
   static RawClass* pc_descriptors_class_;  // Class of PcDescriptors vm object.
   static RawClass* stackmap_class_;  // Class of Stackmap vm object.
@@ skipping 1000 matching lines @@
   RawClass* signature_class() const;
   void set_signature_class(const Class& value) const;
 
   RawCode* closure_allocation_stub() const;
   void set_closure_allocation_stub(const Code& value) const;
 
   // Return the closure function implicitly created for this function.
   // If none exists yet, create one and remember it.
   RawFunction* ImplicitClosureFunction() const;
 
+  // Redirection information for a redirecting factory.
+  bool IsRedirectingFactory() const;
+  RawType* RedirectionType() const;
+  void SetRedirectionType(const Type& type) const;
+  RawString* RedirectionIdentifier() const;
+  void SetRedirectionIdentifier(const String& identifier) const;
+  RawFunction* RedirectionTarget() const;
+  void SetRedirectionTarget(const Function& target) const;
+
   RawFunction::Kind kind() const {
     return KindBits::decode(raw_ptr()->kind_tag_);
   }
 
   bool is_static() const { return StaticBit::decode(raw_ptr()->kind_tag_); }
   bool is_const() const { return ConstBit::decode(raw_ptr()->kind_tag_); }
   bool is_external() const { return ExternalBit::decode(raw_ptr()->kind_tag_); }
   bool IsConstructor() const {
     return (kind() == RawFunction::kConstructor) && !is_static();
   }
@@ skipping 325 matching lines @@
 
   static RawClosureData* New();
 
   HEAP_OBJECT_IMPLEMENTATION(ClosureData, Object);
   friend class Class;
   friend class Function;
   friend class HeapProfiler;
 };
 
 
+class RedirectionData: public Object {
+ public:
+  static intptr_t InstanceSize() {
+    return RoundedAllocationSize(sizeof(RawRedirectionData));
+  }
+
+ private:
+  // The type specifies the class and type arguments of the target constructor.
+  RawType* type() const { return raw_ptr()->type_; }
+  void set_type(const Type& value) const;
+
+  // The optional identifier specifies a named constructor.
+  RawString* identifier() const { return raw_ptr()->identifier_; }
+  void set_identifier(const String& value) const;
+
+  // The resolved constructor or factory target of the redirection.
+  RawFunction* target() const { return raw_ptr()->target_; }
+  void set_target(const Function& value) const;
+
+  static RawRedirectionData* New();
+
+  HEAP_OBJECT_IMPLEMENTATION(RedirectionData, Object);
+  friend class Class;
+  friend class Function;
+  friend class HeapProfiler;
+};
+
+
 class Field : public Object {
  public:
   RawString* name() const { return raw_ptr()->name_; }
   RawString* UserVisibleName() const;
   virtual RawString* DictionaryName() const { return name(); }
 
   bool is_static() const { return StaticBit::decode(raw_ptr()->kind_bits_); }
   bool is_final() const { return FinalBit::decode(raw_ptr()->kind_bits_); }
   bool is_const() const { return ConstBit::decode(raw_ptr()->kind_bits_); }
 
@@ skipping 3878 matching lines @@
     if (this->CharAt(i) != str.CharAt(begin_index + i)) {
       return false;
     }
   }
   return true;
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_