One Zone per CompilationInfo.

src/stub-cache.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 242 matching lines @@
   // Update cache for entry hash(name, map).
   Code* Set(String* name, Map* map, Code* code);
 
   // Clear the lookup table (@ mark compact collection).
   void Clear();
 
   // Collect all maps that match the name and flags.
   void CollectMatchingMaps(SmallMapList* types,
                            String* name,
                            Code::Flags flags,
-                           Handle<Context> global_context);
+                           Handle<Context> global_context,
+                           Zone* zone);
 
   // Generate code for probing the stub cache table.
   // Arguments extra, extra2 and extra3 may be used to pass additional scratch
   // registers. Set to no_reg if not needed.
   void GenerateProbe(MacroAssembler* masm,
                      Code::Flags flags,
                      Register receiver,
                      Register name,
                      Register scratch,
                      Register extra,
@@ skipping 29 matching lines @@
       case StubCache::kPrimary: return StubCache::primary_;
       case StubCache::kSecondary: return StubCache::secondary_;
     }
     UNREACHABLE();
     return NULL;
   }
 
   Isolate* isolate() { return isolate_; }
   Heap* heap() { return isolate()->heap(); }
   Factory* factory() { return isolate()->factory(); }
-  Zone* zone() const { return zone_; }
 
  private:
   StubCache(Isolate* isolate, Zone* zone);
 
   Handle<Code> ComputeCallInitialize(int argc,
                                      RelocInfo::Mode mode,
                                      Code::Kind kind);
 
   // The stub cache has a primary and secondary level.  The two levels have
   // different hashing algorithms in order to avoid simultaneous collisions
@@ skipping 55 matching lines @@
   }
 
   static const int kPrimaryTableBits = 11;
   static const int kPrimaryTableSize = (1 << kPrimaryTableBits);
   static const int kSecondaryTableBits = 9;
   static const int kSecondaryTableSize = (1 << kSecondaryTableBits);
 
   Entry primary_[kPrimaryTableSize];
   Entry secondary_[kSecondaryTableSize];
   Isolate* isolate_;
-  Zone* zone_;
 
   friend class Isolate;
   friend class SCTableReference;
 
   DISALLOW_COPY_AND_ASSIGN(StubCache);
 };
 
 
 // ------------------------------------------------------------------------
 
@@ skipping 515 matching lines @@
   Handle<JSFunction> constant_function_;
   bool is_simple_api_call_;
   Handle<FunctionTemplateInfo> expected_receiver_type_;
   Handle<CallHandlerInfo> api_call_info_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_STUB_CACHE_H_