[code-serializer] Handlify in CodeSerializer::Deserialize

This section potentially contains allocations and thus gc, all object
references should be handlified.

Bug: v8:9333
Change-Id: I5814e66e8b9b75a8bd952afecae7a3a27b42a642
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1647695
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Reviewed-by: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62012}

src/snapshot/code-serializer.cc

@@ -301,7 +301,7 @@ MaybeHandle<SharedFunctionInfo> CodeSerializer::Deserialize(
     PrintF("[Deserializing from %d bytes took %0.3f ms]\n", length, ms);
   }
 
-  bool log_code_creation =
+  const bool log_code_creation =
       isolate->logger()->is_listening_to_code_events() ||
       isolate->is_profiling() ||
       isolate->code_event_dispatcher()->IsListeningToCodeEvents();
@@ -313,29 +313,31 @@ MaybeHandle<SharedFunctionInfo> CodeSerializer::Deserialize(
 #endif  // V8_TARGET_ARCH_ARM
 
   if (log_code_creation || FLAG_log_function_events) {
-    String name = ReadOnlyRoots(isolate).empty_string();
-    Script script = Script::cast(result->script());
-    Handle<Script> script_handle(script, isolate);
-    if (script.name().IsString()) name = String::cast(script.name());
-    Handle<String> name_handle(name, isolate);
+    Handle<Script> script(Script::cast(result->script()), isolate);
+    Handle<String> name(script->name().IsString()
+                            ? String::cast(script->name())
+                            : ReadOnlyRoots(isolate).empty_string(),
+                        isolate);
+
     if (FLAG_log_function_events) {
-      LOG(isolate, FunctionEvent("deserialize", script.id(),
-                                 timer.Elapsed().InMillisecondsF(),
-                                 result->StartPosition(), result->EndPosition(),
-                                 *name_handle));
+      LOG(isolate,
+          FunctionEvent("deserialize", script->id(),
+                        timer.Elapsed().InMillisecondsF(),
+                        result->StartPosition(), result->EndPosition(), *name));
     }
     if (log_code_creation) {
-      Script::InitLineEnds(Handle<Script>(script, isolate));
+      Script::InitLineEnds(script);
+
       DisallowHeapAllocation no_gc;
-      SharedFunctionInfo::ScriptIterator iter(isolate, script);
+      SharedFunctionInfo::ScriptIterator iter(isolate, *script);
       for (i::SharedFunctionInfo info = iter.Next(); !info.is_null();
            info = iter.Next()) {
         if (info.is_compiled()) {
-          int line_num = script.GetLineNumber(info.StartPosition()) + 1;
-          int column_num = script.GetColumnNumber(info.StartPosition()) + 1;
+          int line_num = script->GetLineNumber(info.StartPosition()) + 1;
+          int column_num = script->GetColumnNumber(info.StartPosition()) + 1;
           PROFILE(isolate, CodeCreateEvent(CodeEventListener::SCRIPT_TAG,
-                                           info.abstract_code(), info,
-                                           *name_handle, line_num, column_num));
+                                           info.abstract_code(), info, *name,
+                                           line_num, column_num));
         }
       }
     }