- Support for patching of class methods and fields.

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 232 matching lines @@
   static RawInstance* sentinel() { return sentinel_; }
   // Value marking that we are transitioning from sentinel, e.g., computing
   // a field value. Used to detect circular initialization.
   static RawInstance* transition_sentinel() { return transition_sentinel_; }
 
   static RawClass* class_class() { return class_class_; }
   static RawClass* null_class() { return null_class_; }
   static RawClass* dynamic_class() { return dynamic_class_; }
   static RawClass* void_class() { return void_class_; }
   static RawClass* unresolved_class_class() { return unresolved_class_class_; }
-  static RawClass* type_class() {
-      return type_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* 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_; }
@@ skipping 109 matching lines @@
   static RawClass* class_class_;  // Class of the Class vm object.
   static RawClass* null_class_;  // Class of the null object.
   static RawClass* dynamic_class_;  // Class of the 'Dynamic' type.
   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* 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.
@@ skipping 272 matching lines @@
 
   RawCode* allocation_stub() const {
     return raw_ptr()->allocation_stub_;
   }
   void set_allocation_stub(const Code& value) const;
 
   RawArray* constants() const;
 
   void Finalize() const;
 
+  void ApplyPatch(const Class& with) const;
+
   // Allocate a class used for VM internal objects.
   template <class FakeObject> static RawClass* New();
 
   // Allocate instance classes and interfaces.
   static RawClass* New(const String& name,
                        const Script& script,
                        intptr_t token_pos);
   static RawClass* NewInterface(const String& name,
                                 const Script& script,
                                 intptr_t token_pos);
@@ skipping 580 matching lines @@
       const AbstractTypeArguments& value) const;
   void set_instantiator_type_arguments(
       const AbstractTypeArguments& value) const;
   static RawInstantiatedTypeArguments* New();
 
   HEAP_OBJECT_IMPLEMENTATION(InstantiatedTypeArguments, AbstractTypeArguments);
   friend class Class;
 };
 
 
+class PatchClass : public Object {
+ public:
+  RawClass* patched_class() const { return raw_ptr()->patched_class_; }
+  RawScript* script() const { return raw_ptr()->script_; }
+
+  static intptr_t InstanceSize() {
+    return RoundedAllocationSize(sizeof(RawPatchClass));
+  }
+
+  static RawPatchClass* New(const Class& patched_class, const Script& script);
+
+ private:
+  void set_patched_class(const Class& value) const;
+  void set_script(const Script& value) const;
+  static RawPatchClass* New();
+
+  HEAP_OBJECT_IMPLEMENTATION(PatchClass, Object);
+  friend class Class;
+};
+
+
 class Function : public Object {
  public:
   RawString* name() const { return raw_ptr()->name_; }
   RawString* UserVisibleName() const;
   RawString* QualifiedUserVisibleName() const;
 
   // Build a string of the form '<T, R>(T, [b: B, c: C]) => R' representing the
   // internal signature of the given function.
   RawString* Signature() const {
     const bool instantiate = false;
     return BuildSignature(instantiate, kInternalName, TypeArguments::Handle());
   }
 
   // Build a string of the form '(A, [b: B, c: C]) => D' representing the
   // signature of the given function, where all generic types (e.g. '<T, R>' in
   // '<T, R>(T, [b: B, c: C]) => R') are instantiated using the given
   // instantiator type argument vector (e.g. '<A, D>').
   RawString* InstantiatedSignatureFrom(
       const AbstractTypeArguments& instantiator,
       NameVisibility name_visibility) const {
     const bool instantiate = true;
     return BuildSignature(instantiate, name_visibility, instantiator);
   }
 
   // Returns true if the signature of this function is instantiated, i.e. if it
   // does not involve generic parameter types or generic result type.
   bool HasInstantiatedSignature() const;
 
-  RawClass* owner() const { return raw_ptr()->owner_; }
+  RawClass* Owner() const;
+
+  RawScript* script() const;
 
   RawAbstractType* result_type() const { return raw_ptr()->result_type_; }
   void set_result_type(const AbstractType& value) const;
 
   RawAbstractType* ParameterTypeAt(intptr_t index) const;
   void SetParameterTypeAt(intptr_t index, const AbstractType& value) const;
   void set_parameter_types(const Array& value) const;
 
   // Parameter names are valid for all valid parameter indices, and are not
   // limited to named optional parameters.
@@ skipping 292 matching lines @@
   class ExternalBit : public BitField<bool, kExternalBit, 1> {};
   class KindBits :
     public BitField<RawFunction::Kind, kKindTagBit, kKindTagSize> {}; // NOLINT
 
   void set_name(const String& value) const;
   void set_kind(RawFunction::Kind value) const;
   void set_is_static(bool is_static) const;
   void set_is_const(bool is_const) const;
   void set_is_external(bool value) const;
   void set_parent_function(const Function& value) const;
-  void set_owner(const Class& value) const;
+  void set_owner(const Object& value) const;
   void set_token_pos(intptr_t value) const;
   void set_implicit_closure_function(const Function& value) const;
   void set_kind_tag(intptr_t value) const;
   static RawFunction* New();
 
   RawString* BuildSignature(bool instantiate,
                             NameVisibility name_visibility,
                             const AbstractTypeArguments& instantiator) const;
 
   // Check the subtype or 'more specific' relationship.
@@ skipping 3818 matching lines @@
     if (this->CharAt(i) != str.CharAt(begin_index + i)) {
       return false;
     }
   }
   return true;
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_