Allow invalidation and recompilation of instance allocation stubs. Requested in order to implement…

runtime/vm/object.cc

 // 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.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 3599 matching lines @@
 }
 
 
 void Class::set_allocation_stub(const Code& value) const {
   ASSERT(!value.IsNull());
   ASSERT(raw_ptr()->allocation_stub_ == Code::null());
   StorePointer(&raw_ptr()->allocation_stub_, value.raw());
 }
 
 
+void Class::DisableAllocationStub() const {
+  const Code& alloc_stub = Code::Handle(allocation_stub());
+  if (!alloc_stub.IsNull()) {
+    CodePatcher::PatchEntry(alloc_stub);
+    StorePointer(&raw_ptr()->allocation_stub_, Code::null());
+  }
+}
+
+
 bool Class::IsFunctionClass() const {
   return raw() == Type::Handle(Type::Function()).type_class();
 }
 
 
 bool Class::IsCanonicalSignatureClass() const {
   const Function& function = Function::Handle(signature_function());
   return (!function.IsNull() && (function.signature_class() == raw()));
 }
 
@@ skipping 16732 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart