Enable map dependency to in-flight compilation info.

src/compiler.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 39 matching lines @@
 struct OffsetRange {
   OffsetRange(int from, int to) : from(from), to(to) {}
   int from;
   int to;
 };
 
 // CompilationInfo encapsulates some information known at compile time.  It
 // is constructed based on the resources available at compile-time.
 class CompilationInfo {
  public:
-  CompilationInfo(Handle<Script> script, Zone* zone);
-  CompilationInfo(Handle<SharedFunctionInfo> shared_info, Zone* zone);
   CompilationInfo(Handle<JSFunction> closure, Zone* zone);
-  CompilationInfo(HydrogenCodeStub* stub, Isolate* isolate, Zone* zone);
-
-  ~CompilationInfo();
+  virtual ~CompilationInfo();
 
   Isolate* isolate() {
     ASSERT(Isolate::Current() == isolate_);
     return isolate_;
   }
   Zone* zone() { return zone_; }
   bool is_lazy() const { return IsLazy::decode(flags_); }
   bool is_eval() const { return IsEval::decode(flags_); }
   bool is_global() const { return IsGlobal::decode(flags_); }
   bool is_classic_mode() const { return language_mode() == CLASSIC_MODE; }
@@ skipping 160 matching lines @@
 
   // Disable all optimization attempts of this info for the rest of the
   // current compilation pipeline.
   void AbortOptimization();
 
   void set_deferred_handles(DeferredHandles* deferred_handles) {
     ASSERT(deferred_handles_ == NULL);
     deferred_handles_ = deferred_handles;
   }
 
+  ZoneList<Handle<Map> >* dependent_maps(DependentCode::DependencyGroup group) {
+    if (dependent_maps_[group] == NULL) {
+      dependent_maps_[group] = new(zone_) ZoneList<Handle<Map> >(2, zone_);
+    }
+    return dependent_maps_[group];
+  }
+
+  void CommitDependentMaps(Handle<Code> code);
+
+  void RollbackDependentMaps();
+
   void SaveHandles() {
     SaveHandle(&closure_);
     SaveHandle(&shared_info_);
     SaveHandle(&context_);
     SaveHandle(&script_);
   }
 
   const char* bailout_reason() const { return bailout_reason_; }
   void set_bailout_reason(const char* reason) { bailout_reason_ = reason; }
 
@@ skipping 13 matching lines @@
   inline void AddNoFrameRange(int from, int to) {
     if (no_frame_ranges_) no_frame_ranges_->Add(OffsetRange(from, to));
   }
 
   List<OffsetRange>* ReleaseNoFrameRanges() {
     List<OffsetRange>* result = no_frame_ranges_;
     no_frame_ranges_ = NULL;
     return result;
   }
 
+  Handle<Foreign> object_wrapper() {
+    if (object_wrapper_.is_null()) {
+      object_wrapper_ =
+          isolate()->factory()->NewForeign(reinterpret_cast<Address>(this));
+    }
+    return object_wrapper_;
+  }
+
+  void AbortDueToDependentMap() {
+    mode_ = DEPENDENT_MAP_ABORT;
+  }
+
+  bool HasAbortedDueToDependentMap() {
+    return mode_ == DEPENDENT_MAP_ABORT;
+  }
+
+ protected:
+  CompilationInfo(Handle<Script> script, Zone* zone);
+  CompilationInfo(Handle<SharedFunctionInfo> shared_info, Zone* zone);
+  CompilationInfo(HydrogenCodeStub* stub, Isolate* isolate, Zone* zone);
 
  private:
   Isolate* isolate_;
 
   // Compilation mode.
   // BASE is generated by the full codegen, optionally prepared for bailouts.
   // OPTIMIZE is optimized code generated by the Hydrogen-based backend.
   // NONOPT is generated by the full codegen and is not prepared for
   //   recompilation/bailouts.  These functions are never recompiled.
   enum Mode {
     BASE,
     OPTIMIZE,
     NONOPT,
-    STUB
+    STUB,
+    DEPENDENT_MAP_ABORT
   };
 
   void Initialize(Isolate* isolate, Mode mode, Zone* zone);
 
   void SetMode(Mode mode) {
     ASSERT(V8::UseCrankshaft());
     mode_ = mode;
   }
 
   // Flags using template class BitField<type, start, length>.  All are
@@ skipping 59 matching lines @@
   // Compilation mode flag and whether deoptimization is allowed.
   Mode mode_;
   BailoutId osr_ast_id_;
 
   // The zone from which the compilation pipeline working on this
   // CompilationInfo allocates.
   Zone* zone_;
 
   DeferredHandles* deferred_handles_;
 
+  ZoneList<Handle<Map> >* dependent_maps_[DependentCode::kGroupCount];
+
   template<typename T>
   void SaveHandle(Handle<T> *object) {
     if (!object->is_null()) {
       Handle<T> handle(*(*object));
       *object = handle;
     }
   }
 
   const char* bailout_reason_;
 
   int prologue_offset_;
 
   List<OffsetRange>* no_frame_ranges_;
 
   // A copy of shared_info()->opt_count() to avoid handle deref
   // during graph optimization.
   int opt_count_;
 
+  Handle<Foreign> object_wrapper_;
+
   DISALLOW_COPY_AND_ASSIGN(CompilationInfo);
 };
 
 
 // Exactly like a CompilationInfo, except also creates and enters a
 // Zone on construction and deallocates it on exit.
 class CompilationInfoWithZone: public CompilationInfo {
  public:
   explicit CompilationInfoWithZone(Handle<Script> script)
       : CompilationInfo(script, &zone_),
         zone_(script->GetIsolate()),
         zone_scope_(&zone_, DELETE_ON_EXIT) {}
   explicit CompilationInfoWithZone(Handle<SharedFunctionInfo> shared_info)
       : CompilationInfo(shared_info, &zone_),
         zone_(shared_info->GetIsolate()),
         zone_scope_(&zone_, DELETE_ON_EXIT) {}
   explicit CompilationInfoWithZone(Handle<JSFunction> closure)
       : CompilationInfo(closure, &zone_),
         zone_(closure->GetIsolate()),
         zone_scope_(&zone_, DELETE_ON_EXIT) {}
-  explicit CompilationInfoWithZone(HydrogenCodeStub* stub, Isolate* isolate)
+  CompilationInfoWithZone(HydrogenCodeStub* stub, Isolate* isolate)
       : CompilationInfo(stub, isolate, &zone_),
         zone_(isolate),
         zone_scope_(&zone_, DELETE_ON_EXIT) {}
 
+  // Virtual destructor because a CompilationInfoWithZone has to exit the
+  // zone scope and get rid of dependent maps even when the destructor is
+  // called when cast as a CompilationInfo.
+  virtual ~CompilationInfoWithZone() {
+    RollbackDependentMaps();
+  }
+
  private:
   Zone zone_;
   ZoneScope zone_scope_;
 };
 
 
 // A wrapper around a CompilationInfo that detaches the Handles from
 // the underlying DeferredHandleScope and stores them in info_ on
 // destruction.
 class CompilationHandleScope BASE_EMBEDDED {
@@ skipping 149 matching lines @@
 
   static void RecordFunctionCompilation(Logger::LogEventsAndTags tag,
                                         CompilationInfo* info,
                                         Handle<SharedFunctionInfo> shared);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILER_H_