Keep a canonical list of shared function infos.

src/snapshot/serialize.cc

 // 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.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/base/platform/platform.h"
 #include "src/bootstrapper.h"
@@ skipping 1853 matching lines @@
     Object* prototype_users = PrototypeInfo::cast(object_)->prototype_users();
     if (prototype_users->IsWeakFixedArray()) {
       WeakFixedArray::cast(prototype_users)->Compact();
     }
   }
 
   if (object_->IsScript()) {
     // Clear cached line ends.
     Object* undefined = serializer_->isolate()->heap()->undefined_value();
     Script::cast(object_)->set_line_ends(undefined);
+    Object* shared_list = Script::cast(object_)->shared_function_infos();
+    if (shared_list->IsWeakFixedArray()) {
+      WeakFixedArray::cast(shared_list)->Compact();
+    }
   }
 
   if (object_->IsExternalString()) {
     Heap* heap = serializer_->isolate()->heap();
     if (object_->map() != heap->native_source_string_map()) {
       // Usually we cannot recreate resources for external strings. To work
       // around this, external strings are serialized to look like ordinary
       // sequential strings.
       // The exception are native source code strings, since we can recreate
       // their resources. In that case we fall through and leave it to
@@ skipping 400 matching lines @@
         return;
 #define IC_KIND_CASE(KIND) case Code::KIND:
         IC_KIND_LIST(IC_KIND_CASE)
 #undef IC_KIND_CASE
         SerializeIC(code_object, how_to_code, where_to_point);
         return;
       case Code::FUNCTION:
         DCHECK(code_object->has_reloc_info_for_serialization());
         // Only serialize the code for the toplevel function unless specified
         // by flag. Replace code of inner functions by the lazy compile builtin.
-        // This is safe, as checked in Compiler::BuildFunctionInfo.
+        // This is safe, as checked in Compiler::GetSharedFunctionInfo.
         if (code_object != main_code_ && !FLAG_serialize_inner) {
           SerializeBuiltin(Builtins::kCompileLazy, how_to_code, where_to_point);
         } else {
           SerializeGeneric(code_object, how_to_code, where_to_point);
         }
         return;
     }
     UNREACHABLE();
   }
 
@@ skipping 399 matching lines @@
   SerializedCodeData* scd = new SerializedCodeData(cached_data);
   SanityCheckResult r = scd->SanityCheck(isolate, source);
   if (r == CHECK_SUCCESS) return scd;
   cached_data->Reject();
   source->GetIsolate()->counters()->code_cache_reject_reason()->AddSample(r);
   delete scd;
   return NULL;
 }
 }  // namespace internal
 }  // namespace v8