First stab at mixins in VM compiler

runtime/vm/object.cc

Index: runtime/vm/object.cc
===================================================================
--- runtime/vm/object.cc	(revision 18363)
+++ runtime/vm/object.cc	(working copy)
@@ -2075,6 +2075,13 @@
 }
 
 
+void Class::set_mixin(const Type& value) const {
+  // Resolution and application of mixin type occurs in finalizer.
+  ASSERT(!value.IsNull());
+  StorePointer(&raw_ptr()->mixin_, value.raw());
+}
+
+
 void Class::AddDirectSubclass(const Class& subclass) const {
   ASSERT(!subclass.IsNull());
   ASSERT(subclass.SuperClass() == raw());
@@ -4081,6 +4088,15 @@
 }
 
 
+// The compiler generates an implicit constructor if a class definition
+// does not contain an explicit constructor or factory. The implicit
+// constructor has the same token position as the owner class.
+bool Function::IsImplicitConstructor() const {
+  return IsConstructor() &&
+         (token_pos() == Class::Handle(Owner()).token_pos());
+}
+
+
 bool Function::IsImplicitClosureFunction() const {
   if (!IsClosureFunction()) {
     return false;
@@ -4140,6 +4156,24 @@
 }
 
 
+RawFunction* Function::Clone(const Class& new_owner) const {
+  ASSERT(!IsConstructor());
+  Function& clone = Function::Handle();
+  clone ^= Object::Clone(*this, Heap::kOld);
+  const Class& owner = Class::Handle(this->Owner());
+  const PatchClass& clone_owner =
+      PatchClass::Handle(PatchClass::New(new_owner, owner));
+  clone.set_owner(clone_owner);
+  clone.StorePointer(&clone.raw_ptr()->code_, Code::null());
+  clone.StorePointer(&clone.raw_ptr()->unoptimized_code_, Code::null());
+  clone.set_usage_counter(0);
+  clone.set_deoptimization_counter(0);
+  clone.set_optimized_instruction_count(0);
+  clone.set_optimized_call_site_count(0);
+  return clone.raw();
+}
+
+
 RawFunction* Function::NewClosureFunction(const String& name,
                                           const Function& parent,
                                           intptr_t token_pos) {
@@ -4378,6 +4412,16 @@
 }
 
 
+RawClass* Function::origin() const {
+  const Object& obj = Object::Handle(raw_ptr()->owner_);
+  if (obj.IsClass()) {
+    return Class::Cast(obj).raw();
+  }
+  ASSERT(obj.IsPatchClass());
+  return PatchClass::Cast(obj).source_class();
+}
+
+
 RawScript* Function::script() const {
   const Object& obj = Object::Handle(raw_ptr()->owner_);
   if (obj.IsClass()) {
@@ -4637,6 +4681,26 @@
 }
 
 
+RawClass* Field::owner() const {
+  const Object& obj = Object::Handle(raw_ptr()->owner_);
+  if (obj.IsClass()) {
+    return Class::Cast(obj).raw();
+  }
+  ASSERT(obj.IsPatchClass());
+  return PatchClass::Cast(obj).patched_class();
+}
+
+
+RawClass* Field::origin() const {
+  const Object& obj = Object::Handle(raw_ptr()->owner_);
+  if (obj.IsClass()) {
+    return Class::Cast(obj).raw();
+  }
+  ASSERT(obj.IsPatchClass());
+  return PatchClass::Cast(obj).source_class();
+}
+
+
 RawInstance* Field::value() const {
   ASSERT(is_static());  // Valid only for static dart fields.
   return raw_ptr()->value_;
@@ -4688,6 +4752,18 @@
 }
 
 
+
+RawField* Field::Clone(const Class& new_owner) const {
+  Field& clone = Field::Handle();
+  clone ^= Object::Clone(*this, Heap::kOld);
+  const Class& owner = Class::Handle(this->owner());
+  const PatchClass& clone_owner =
+      PatchClass::Handle(PatchClass::New(new_owner, owner));
+  clone.set_owner(clone_owner);
+  return clone.raw();
+}
+
+
 RawString* Field::UserVisibleName() const {
   const String& str = String::Handle(name());
   return IdentifierPrettyName(str);