Do not save script object on the class constructor.

src/runtime/runtime-classes.cc

Index: src/runtime/runtime-classes.cc
diff --git a/src/runtime/runtime-classes.cc b/src/runtime/runtime-classes.cc
index 1b70f05a60d57d0dac197b3d2a4447a413dc7dc5..3db4330cec7d0f2a2e1f857b872d39f9164f805f 100644
--- a/src/runtime/runtime-classes.cc
+++ b/src/runtime/runtime-classes.cc
@@ -97,7 +97,6 @@ RUNTIME_FUNCTION(Runtime_HomeObjectSymbol) {
 static MaybeHandle<Object> DefineClass(Isolate* isolate, Handle<Object> name,
                                        Handle<Object> super_class,
                                        Handle<JSFunction> constructor,
-                                       Handle<Script> script,
                                        int start_position, int end_position) {
   Handle<Object> prototype_parent;
   Handle<Object> constructor_parent;
@@ -182,11 +181,6 @@ static MaybeHandle<Object> DefineClass(Isolate* isolate, Handle<Object> name,
 
   // Install private properties that are used to construct the FunctionToString.
   RETURN_ON_EXCEPTION(
-      isolate, Object::SetProperty(constructor,
-                                   isolate->factory()->class_script_symbol(),
-                                   script, STRICT),
-      Object);
-  RETURN_ON_EXCEPTION(
       isolate,
       Object::SetProperty(
           constructor, isolate->factory()->class_start_position_symbol(),
@@ -204,31 +198,29 @@ static MaybeHandle<Object> DefineClass(Isolate* isolate, Handle<Object> name,
 
 RUNTIME_FUNCTION(Runtime_DefineClass) {
   HandleScope scope(isolate);
-  DCHECK(args.length() == 6);
+  DCHECK(args.length() == 5);
   CONVERT_ARG_HANDLE_CHECKED(Object, name, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, super_class, 1);
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, constructor, 2);
-  CONVERT_ARG_HANDLE_CHECKED(Script, script, 3);
-  CONVERT_SMI_ARG_CHECKED(start_position, 4);
-  CONVERT_SMI_ARG_CHECKED(end_position, 5);
+  CONVERT_SMI_ARG_CHECKED(start_position, 3);
+  CONVERT_SMI_ARG_CHECKED(end_position, 4);
 
   Handle<Object> result;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, result, DefineClass(isolate, name, super_class, constructor,
-                                   script, start_position, end_position));
+                                   start_position, end_position));
   return *result;
 }
 
 
 RUNTIME_FUNCTION(Runtime_DefineClassStrong) {
   HandleScope scope(isolate);
-  DCHECK(args.length() == 6);
+  DCHECK(args.length() == 5);
   CONVERT_ARG_HANDLE_CHECKED(Object, name, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, super_class, 1);
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, constructor, 2);
-  CONVERT_ARG_HANDLE_CHECKED(Script, script, 3);
-  CONVERT_SMI_ARG_CHECKED(start_position, 4);
-  CONVERT_SMI_ARG_CHECKED(end_position, 5);
+  CONVERT_SMI_ARG_CHECKED(start_position, 3);
+  CONVERT_SMI_ARG_CHECKED(end_position, 4);
 
   if (super_class->IsNull()) {
     THROW_NEW_ERROR_RETURN_FAILURE(
@@ -238,7 +230,7 @@ RUNTIME_FUNCTION(Runtime_DefineClassStrong) {
   Handle<Object> result;
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, result, DefineClass(isolate, name, super_class, constructor,
-                                   script, start_position, end_position));
+                                   start_position, end_position));
   return *result;
 }
 
@@ -283,32 +275,20 @@ RUNTIME_FUNCTION(Runtime_ClassGetSourceCode) {
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, fun, 0);
 
-  Handle<Object> script;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, script,
-      Object::GetProperty(fun, isolate->factory()->class_script_symbol()));
-  if (!script->IsScript()) {
-    return isolate->heap()->undefined_value();
-  }
-
   Handle<Symbol> start_position_symbol(
       isolate->heap()->class_start_position_symbol());
-  Handle<Object> start_position;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, start_position, Object::GetProperty(fun, start_position_symbol));
+  Handle<Object> start_position =
+      JSReceiver::GetDataProperty(fun, start_position_symbol);
+  if (!start_position->IsSmi()) return isolate->heap()->undefined_value();
 
   Handle<Symbol> end_position_symbol(
       isolate->heap()->class_end_position_symbol());
-  Handle<Object> end_position;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, end_position, Object::GetProperty(fun, end_position_symbol));
-
-  if (!start_position->IsSmi() || !end_position->IsSmi() ||
-      !Handle<Script>::cast(script)->HasValidSource()) {
-    return isolate->ThrowIllegalOperation();
-  }
+  Handle<Object> end_position =
+      JSReceiver::GetDataProperty(fun, end_position_symbol);
+  CHECK(end_position->IsSmi());
 
-  Handle<String> source(String::cast(Handle<Script>::cast(script)->source()));
+  Handle<String> source(
+      String::cast(Script::cast(fun->shared()->script())->source()));
   return *isolate->factory()->NewSubString(
       source, Handle<Smi>::cast(start_position)->value(),
       Handle<Smi>::cast(end_position)->value());