[promisehook] Implement PromiseHook

src/isolate.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include <memory>
 #include <queue>
 
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   BasicBlockProfiler* GetOrCreateBasicBlockProfiler();
   BasicBlockProfiler* basic_block_profiler() { return basic_block_profiler_; }
 
   std::string GetTurboCfgFileName();
 
 #if TRACE_MAPS
   int GetNextUniqueSharedFunctionInfoId() { return next_unique_sfi_id_++; }
 #endif
 
-  Address is_promisehook_enabled_address() {
-    return reinterpret_cast<Address>(&is_promisehook_enabled_);
+  Address promise_hook_address() {
+    return reinterpret_cast<Address>(&promise_hook_);
   }
-  bool IsPromiseHookEnabled() { return is_promisehook_enabled_; }
-  void EnablePromiseHook();
-  void DisablePromiseHook();
+  void SetPromiseHook(PromiseHook hook);
+  void RunPromiseHook(PromiseHookType type, Handle<JSPromise> promise,
+                      Handle<Object> parent);
 
   // Support for dynamically disabling tail call elimination.
   Address is_tail_call_elimination_enabled_address() {
     return reinterpret_cast<Address>(&is_tail_call_elimination_enabled_);
   }
   bool is_tail_call_elimination_enabled() const {
     return is_tail_call_elimination_enabled_;
   }
   void SetTailCallEliminationEnabled(bool enabled);
 
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   unibrow::Mapping<unibrow::CanonicalizationRange> jsregexp_canonrange_;
   unibrow::Mapping<unibrow::Ecma262Canonicalize>
       regexp_macro_assembler_canonicalize_;
   RegExpStack* regexp_stack_;
   List<int> regexp_indices_;
   DateCache* date_cache_;
   CallInterfaceDescriptorData* call_descriptor_data_;
   AccessCompilerData* access_compiler_data_;
   base::RandomNumberGenerator* random_number_generator_;
   base::AtomicValue<RAILMode> rail_mode_;
+  PromiseHook promise_hook_;
 
   // Whether the isolate has been created for snapshotting.
   bool serializer_enabled_;
 
   // True if fatal error has been signaled for this isolate.
   bool has_fatal_error_;
 
   // True if this isolate was initialized from a snapshot.
   bool initialized_from_snapshot_;
 
-  // True if PromiseHook feature is enabled.
-  bool is_promisehook_enabled_;
-
   // True if ES2015 tail call elimination feature is enabled.
   bool is_tail_call_elimination_enabled_;
 
   // True if the isolate is in background. This flag is used
   // to prioritize between memory usage and latency.
   bool is_isolate_in_background_;
 
   // Time stamp at initialization.
   double time_millis_at_init_;
 
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   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ISOLATE_H_