Direct call C++ functions

src/runtime.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 349 matching lines @@
 
 class Runtime : public AllStatic {
  public:
   enum FunctionId {
 #define F(name, nargs, ressize) k##name,
     RUNTIME_FUNCTION_LIST(F)
     kNofFunctions
 #undef F
   };
 
+  enum CallingConvention {
+    // Calling with exit frame. Callee may iterate through the stack frames
+    // and perform garbage collection.
+    EXIT_FRAME_CALL,
+
+    // The callee always returns a valid object.
+    DIRECT_CALL_NOT_FAILS

[Søren Thygesen Gjesse, 2010/02/22 12:38:22]

NOT -> NEVER.

+  };
+
   // Runtime function descriptor.
   struct Function {
     // The JS name of the function.
     const char* name;
 
     // The C++ (native) entry point.
     byte* entry;
 
     // The number of arguments expected; nargs < 0 if variable no. of
     // arguments.
     int nargs;
     int stub_id;
     // Size of result, if complex (larger than a single pointer),
     // otherwise zero.
     int result_size;
+
+    CallingConvention calling_convention;
   };
 
   // Get the runtime function with the given function id.
   static Function* FunctionForId(FunctionId fid);
 
   // Get the runtime function with the given name.
   static Function* FunctionForName(const char* name);
 
   static int StringMatch(Handle<String> sub, Handle<String> pat, int index);
 
@@ skipping 26 matching lines @@
                                                 int position);
 
   // Helper functions used stubs.
   static void PerformGC(Object* result);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_RUNTIME_H_