Deoptimization can occur at Dart calls (includes native calls to C) but not at runtime calls. This …

runtime/vm/native_entry.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_NATIVE_ENTRY_H_
 #define VM_NATIVE_ENTRY_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/exceptions.h"
 #include "vm/native_arguments.h"
 #include "vm/verifier.h"
 
 #include "include/dart_api.h"
 
 namespace dart {
 
+DECLARE_FLAG(bool, deoptimize_alot);
 DECLARE_FLAG(bool, trace_natives);
 
 // Forward declarations.
 class Class;
 class String;
 
 typedef void (*NativeFunction)(NativeArguments* arguments);
 
 
 #define NATIVE_ENTRY_FUNCTION(name) DN_##name
 
 
 // Helper macros for declaring and defining native entries.
 #define REGISTER_NATIVE_ENTRY(name, count)                                     \
   { ""#name, NATIVE_ENTRY_FUNCTION(name), count },
 
 
 #define DEFINE_NATIVE_ENTRY(name, argument_count)                              \
+  extern void DeoptimizeAll();                                                 \

[siva, 2012/08/30 01:37:30]

why not include "code_generator.h" in this file instead of this extern void
DeoptimizeAll declaration.

[srdjan, 2012/08/30 17:16:16]

Done.

   static void DN_Helper##name(Isolate* isolate, NativeArguments* arguments);   \
   void NATIVE_ENTRY_FUNCTION(name)(Dart_NativeArguments args) {                \
     CHECK_STACK_ALIGNMENT;                                                     \
     VERIFY_ON_TRANSITION;                                                      \
     NativeArguments* arguments = reinterpret_cast<NativeArguments*>(args);     \
     ASSERT(arguments->Count() == argument_count);                              \
     if (FLAG_trace_natives) OS::Print("Calling native: %s\n", ""#name);        \
     {                                                                          \
       Zone zone(arguments->isolate());                                         \
       HANDLESCOPE(arguments->isolate());                                       \
       DN_Helper##name(arguments->isolate(), arguments);                        \
+      if (FLAG_deoptimize_alot) DeoptimizeAll();                               \
     }                                                                          \
     VERIFY_ON_TRANSITION;                                                      \
   }                                                                            \
   static void DN_Helper##name(Isolate* isolate, NativeArguments* arguments)
 
 
 #define DECLARE_NATIVE_ENTRY(name, argument_count)                             \
   extern void NATIVE_ENTRY_FUNCTION(name)(Dart_NativeArguments arguments);
 
 // Natives should throw an exception if an illegal argument is passed.
@@ skipping 15 matching lines @@
  public:
   // Resolve specified dart native function to the actual native entrypoint.
   static NativeFunction ResolveNative(const Class& cls,
                                       const String& function_name,
                                       int number_of_arguments);
 };
 
 }  // namespace dart
 
 #endif  // VM_NATIVE_ENTRY_H_