Improved function entry hook coverage

src/isolate.h

 // Copyright 2012 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 531 matching lines @@
   Address get_address_from_id(AddressId id);
 
   // Access to top context (where the current function object was created).
   Context* context() { return thread_local_top_.context_; }
   void set_context(Context* context) {
     ASSERT(context == NULL || context->IsContext());
     thread_local_top_.context_ = context;
   }
   Context** context_address() { return &thread_local_top_.context_; }
 
-  SaveContext* save_context() {return thread_local_top_.save_context_; }
+  SaveContext* save_context() { return thread_local_top_.save_context_; }
   void set_save_context(SaveContext* save) {
     thread_local_top_.save_context_ = save;
   }
 
   // Access to current thread id.
   ThreadId thread_id() { return thread_local_top_.thread_id_; }
   void set_thread_id(ThreadId id) { thread_local_top_.thread_id_ = id; }
 
   // Interface to pending exception.
   MaybeObject* pending_exception() {
@@ skipping 483 matching lines @@
     thread_local_top_.top_lookup_result_ = top;
   }
 
   bool context_exit_happened() {
     return context_exit_happened_;
   }
   void set_context_exit_happened(bool context_exit_happened) {
     context_exit_happened_ = context_exit_happened;
   }
 
+  bool initialized_from_snapshot() { return initialized_from_snapshot_; }
+
   double time_millis_since_init() {
     return OS::TimeCurrentMillis() - time_millis_at_init_;
   }
 
   DateCache* date_cache() {
     return date_cache_;
   }
 
   void set_date_cache(DateCache* date_cache) {
     if (date_cache != date_cache_) {
@@ skipping 37 matching lines @@
   CallbackTable* callback_table() {
     return callback_table_;
   }
   void set_callback_table(CallbackTable* callback_table) {
     callback_table_ = callback_table;
   }
 
   HStatistics* GetHStatistics();
   HTracer* GetHTracer();
 
+  bool HasFunctionEntryHook() {
+    return function_entry_hook_ != NULL &&
+        function_entry_hook_ != NullFunctionEntryHook;
+  }
+  FunctionEntryHook GetFunctionEntryHook();
+  void SetFunctionEntryHook(FunctionEntryHook function_entry_hook);
+  FunctionEntryHook* function_entry_hook_location() {
+    return &function_entry_hook_;
+  }
+
  private:
   Isolate();
 
   int id() const { return static_cast<int>(id_); }
 
   friend struct GlobalState;
   friend struct InitializeGlobalState;
 
   enum State {
     UNINITIALIZED,    // Some components may not have been allocated.
@@ skipping 60 matching lines @@
   static ThreadDataTable* thread_data_table_;
 
   // A global counter for all generated Isolates, might overflow.
   static Atomic32 isolate_counter_;
 
   void Deinit();
 
   static void SetIsolateThreadLocals(Isolate* isolate,
                                      PerIsolateThreadData* data);
 
+  // This function is used as a NULL sentry for the function entry point
+  // callback. This allows shutting callbacks off per-isolate, even after
+  // callbacks have been emitted into stubs and functions.
+  static void NullFunctionEntryHook(uintptr_t function,
+                                    uintptr_t return_addr_location);
+
   // Allocate and insert PerIsolateThreadData into the ThreadDataTable
   // (regardless of whether such data already exists).
   PerIsolateThreadData* AllocatePerIsolateThreadData(ThreadId thread_id);
 
   // Find the PerThread for this particular (isolate, thread) combination.
   // If one does not yet exist, allocate a new one.
   PerIsolateThreadData* FindOrAllocatePerThreadDataForThisThread();
 
   // Initializes the current thread to run this Isolate.
   // Not thread-safe. Multiple threads should not Enter/Exit the same isolate
@@ skipping 82 matching lines @@
       regexp_macro_assembler_canonicalize_;
   RegExpStack* regexp_stack_;
   DateCache* date_cache_;
   unibrow::Mapping<unibrow::Ecma262Canonicalize> interp_canonicalize_mapping_;
   CodeStubInterfaceDescriptor* code_stub_interface_descriptors_;
 
   // The garbage collector should be a little more aggressive when it knows
   // that a context was recently exited.
   bool context_exit_happened_;
 
+  // True if this isolate was initialized from a snapshot.
+  bool initialized_from_snapshot_;
+
   // Time stamp at initialization.
   double time_millis_at_init_;
 
 #if defined(V8_TARGET_ARCH_ARM) && !defined(__arm__) || \
     defined(V8_TARGET_ARCH_MIPS) && !defined(__mips__)
   bool simulator_initialized_;
   HashMap* simulator_i_cache_;
   Redirection* simulator_redirection_;
 #endif
 
 #ifdef DEBUG
   // A static array of histogram info for each type.
   HistogramInfo heap_histograms_[LAST_TYPE + 1];
   JSObject::SpillInformation js_spill_information_;
   int code_kind_statistics_[Code::NUMBER_OF_KINDS];
 #endif
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
   Debugger* debugger_;
   Debug* debug_;
 #endif
   CpuProfiler* cpu_profiler_;
   HeapProfiler* heap_profiler_;
+  FunctionEntryHook function_entry_hook_;
 
 #define GLOBAL_BACKING_STORE(type, name, initialvalue)                         \
   type name##_;
   ISOLATE_INIT_LIST(GLOBAL_BACKING_STORE)
 #undef GLOBAL_BACKING_STORE
 
 #define GLOBAL_ARRAY_BACKING_STORE(type, name, length)                         \
   type name##_[length];
   ISOLATE_INIT_ARRAY_LIST(GLOBAL_ARRAY_BACKING_STORE)
 #undef GLOBAL_ARRAY_BACKING_STORE
@@ skipping 163 matching lines @@
 
 // Mark the native context with out of memory.
 inline void Context::mark_out_of_memory() {
   native_context()->set_out_of_memory(HEAP->true_value());
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_