Implements a new API to set a function entry hook for profiling.

src/v8.h

 // Copyright 2011 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
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   // Report process out of memory. Implementation found in api.cc.
   static void FatalProcessOutOfMemory(const char* location,
                                       bool take_snapshot = false);
 
   // Allows an entropy source to be provided for use in random number
   // generation.
   static void SetEntropySource(EntropySource source);
   // Support for return-address rewriting profilers.
   static void SetReturnAddressLocationResolver(
       ReturnAddressLocationResolver resolver);
+  // Support for a function entry profiling hook.
+  static void SetFunctionEntryHook(uintptr_t entry_hook);
+  // Returns the current function entry profiling hook if any.
+  static uintptr_t GetFunctionEntryHook();
   // Random number generation support. Not cryptographically safe.
   static uint32_t Random(Context* context);
   // We use random numbers internally in memory allocation and in the
   // compilers for security. In order to prevent information leaks we
   // use a separate random state for internal random number
   // generation.
   static uint32_t RandomPrivate(Isolate* isolate);
   static Object* FillHeapNumberWithRandom(Object* heap_number,
                                           Context* context);
 
@@ skipping 31 matching lines @@
 
 // JavaScript defines two kinds of equality.
 enum EqualityKind { kStrictEquality, kNonStrictEquality };
 
 
 } }  // namespace v8::internal
 
 namespace i = v8::internal;
 
 #endif  // V8_V8_H_