Track usage of "this" and "arguments" in Scope

src/scopeinfo.cc

 // Copyright 2011 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 <stdlib.h>
 
 #include "src/v8.h"
 
 #include "src/scopeinfo.h"
 #include "src/scopes.h"
@@ skipping 152 matching lines @@
   }
   return 0;
 }
 
 
 int ScopeInfo::ContextLength() {
   if (length() > 0) {
     int context_locals = ContextLocalCount();
     bool function_name_context_slot =
         FunctionVariableField::decode(Flags()) == CONTEXT;
-    bool has_context = context_locals > 0 ||
-        function_name_context_slot ||
-        scope_type() == WITH_SCOPE ||
-        (scope_type() == FUNCTION_SCOPE && CallsEval()) ||
-        scope_type() == MODULE_SCOPE;
+    bool has_context = context_locals > 0 || function_name_context_slot ||
+                       scope_type() == WITH_SCOPE ||
+                       (scope_type() == ARROW_SCOPE && CallsEval()) ||
+                       (scope_type() == FUNCTION_SCOPE && CallsEval()) ||
+                       scope_type() == MODULE_SCOPE;
     if (has_context) {
       return Context::MIN_CONTEXT_SLOTS + context_locals +
           (function_name_context_slot ? 1 : 0);
     }
   }
   return 0;
 }
 
 
 bool ScopeInfo::HasFunctionName() {
@@ skipping 376 matching lines @@
     } else {
       DCHECK(var->index() >= 0);
       info->set_index(i, var->index());
     }
   }
   DCHECK(i == info->length());
   return info;
 }
 
 } }  // namespace v8::internal