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

runtime/vm/stub_code.h

 // Copyright (c) 2011, 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_STUB_CODE_H_
 #define VM_STUB_CODE_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 
 namespace dart {
 
 // Forward declarations.
 class Code;
 class Isolate;
 class ObjectPointerVisitor;
 class RawCode;
 
 
 // List of stubs created in the VM isolate, these stubs are shared by different
 // isolates running in this dart process.
 #define VM_STUB_CODE_LIST(V)                                                   \
   V(PrintStopMessage)                                                          \
   V(CallToRuntime)                                                             \
   V(LazyCompile)                                                               \
   V(CallBootstrapCFunction)                                                    \
   V(CallNativeCFunction)                                                       \
   V(CallStaticFunction)                                                        \
   V(FixCallersTarget)                                                          \
+  V(FixAllocationStubTarget)                                                   \
   V(Deoptimize)                                                                \
   V(DeoptimizeLazy)                                                            \
   V(ICCallBreakpoint)                                                          \
   V(ClosureCallBreakpoint)                                                     \
   V(RuntimeCallBreakpoint)                                                     \
   V(DebugStepCheck)                                                            \
   V(Subtype1TestCache)                                                         \
   V(Subtype2TestCache)                                                         \
   V(Subtype3TestCache)                                                         \
   V(GetStackPointer)                                                           \
@@ skipping 152 matching lines @@
   // This dummy field is needed so that we can initialize
   // the stubs from a macro.
   void* dummy_;
 
   // Generate the stub and finalize the generated code into the stub
   // code executable area.
   static RawCode* Generate(const char* name,
                            void (*GenerateStub)(Assembler* assembler));
 
   static void GenerateMegamorphicMissStub(Assembler* assembler);
-  static void GenerateAllocationStubForClass(Assembler* assembler,
-                                             const Class& cls);
+  static uword GenerateAllocationStubForClass(Assembler* assembler,
+                                              const Class& cls);
   static void GenerateNArgsCheckInlineCacheStub(
       Assembler* assembler,
       intptr_t num_args,
       const RuntimeEntry& handle_ic_miss,
       Token::Kind kind);
   static void GenerateUsageCounterIncrement(Assembler* assembler,
                                             Register temp_reg);
   static void GenerateOptimizedUsageCounterIncrement(Assembler* assembler);
 
   static void GenerateIdenticalWithNumberCheckStub(
       Assembler* assembler,
       const Register left,
       const Register right,
       const Register temp1 = kNoRegister,
       const Register temp2 = kNoRegister);
 };
 
 }  // namespace dart
 
 #endif  // VM_STUB_CODE_H_