Introduce JIT code events dispatcher for the isolate.

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>
 #include <set>
 
 #include "include/v8-debug.h"
 #include "src/allocation.h"
 #include "src/assert-scope.h"
 #include "src/base/accounting-allocator.h"
 #include "src/base/atomicops.h"
 #include "src/base/hashmap.h"
 #include "src/builtins.h"
@@ skipping 17 matching lines @@
 
 namespace base {
 class RandomNumberGenerator;
 }
 
 namespace internal {
 
 class BasicBlockProfiler;
 class Bootstrapper;
 class CallInterfaceDescriptorData;
+class CodeAgingHelper;
+class CodeEventDispatcher;
 class CodeGenerator;
 class CodeRange;
 class CodeStubDescriptor;
 class CodeTracer;
 class CompilationCache;
 class CompilationStatistics;
 class ContextSlotCache;
 class Counters;
 class CpuFeatures;
 class CpuProfiler;
 class DeoptimizerData;
 class Deserializer;
 class EmptyStatement;
 class ExternalCallbackScope;
 class ExternalReferenceTable;
 class Factory;
 class HandleScopeImplementer;
 class HeapProfiler;
 class HStatistics;
 class HTracer;
 class InlineRuntimeFunctionsTable;
 class InnerPointerToCodeCache;
 class Logger;
 class MaterializedObjectStore;
-class CodeAgingHelper;
+class PositionsRecorder;
 class RegExpStack;
 class SaveContext;
 class StatsTable;
 class StringTracker;
 class StubCache;
 class SweeperThread;
 class ThreadManager;
 class ThreadState;
 class ThreadVisitor;  // Defined in v8threads.h
 class UnicodeCache;
@@ skipping 832 matching lines @@
   RegExpStack* regexp_stack() { return regexp_stack_; }
 
   unibrow::Mapping<unibrow::Ecma262Canonicalize>*
       interp_canonicalize_mapping() {
     return &regexp_macro_assembler_canonicalize_;
   }
 
   Debug* debug() { return debug_; }
 
   bool* is_profiling_address() { return &is_profiling_; }
+  CodeEventDispatcher* code_event_dispatcher() const {
+    return code_event_dispatcher_.get();
+  }
   CpuProfiler* cpu_profiler() const { return cpu_profiler_; }
   HeapProfiler* heap_profiler() const { return heap_profiler_; }
 
 #ifdef DEBUG
   HistogramInfo* heap_histograms() { return heap_histograms_; }
 
   JSObject::SpillInformation* js_spill_information() {
     return &js_spill_information_;
   }
 #endif
@@ skipping 399 matching lines @@
 
 #ifdef DEBUG
   // A static array of histogram info for each type.
   HistogramInfo heap_histograms_[LAST_TYPE + 1];
   JSObject::SpillInformation js_spill_information_;
 #endif
 
   Debug* debug_;
   CpuProfiler* cpu_profiler_;
   HeapProfiler* heap_profiler_;
+  std::unique_ptr<CodeEventDispatcher> code_event_dispatcher_;
   FunctionEntryHook function_entry_hook_;
 
   interpreter::Interpreter* interpreter_;
 
   typedef std::pair<InterruptCallback, void*> InterruptEntry;
   std::queue<InterruptEntry> api_interrupts_queue_;
 
 #define GLOBAL_BACKING_STORE(type, name, initialvalue)                         \
   type name##_;
   ISOLATE_INIT_LIST(GLOBAL_BACKING_STORE)
@@ skipping 289 matching lines @@
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ISOLATE_H_