[es6] Parameter scopes for sloppy eval

src/scopes.h

 // 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.
 
 #ifndef V8_SCOPES_H_
 #define V8_SCOPES_H_
 
 #include "src/ast.h"
 #include "src/pending-compilation-error-handler.h"
 #include "src/zone.h"
@@ skipping 266 matching lines @@
   bool is_catch_scope() const { return scope_type_ == CATCH_SCOPE; }
   bool is_block_scope() const { return scope_type_ == BLOCK_SCOPE; }
   bool is_with_scope() const { return scope_type_ == WITH_SCOPE; }
   bool is_arrow_scope() const { return scope_type_ == ARROW_SCOPE; }
   bool is_declaration_scope() const { return is_declaration_scope_; }
 
   void set_is_declaration_scope() { is_declaration_scope_ = true; }
 
   // Information about which scopes calls eval.
   bool calls_eval() const { return scope_calls_eval_; }
-  bool calls_sloppy_eval() {
+  bool calls_sloppy_eval() const {
     return scope_calls_eval_ && is_sloppy(language_mode_);
   }
   bool outer_scope_calls_sloppy_eval() const {
     return outer_scope_calls_sloppy_eval_;
   }
   bool asm_module() const { return asm_module_; }
   bool asm_function() const { return asm_function_; }
 
   // Is this scope inside a with statement.
   bool inside_with() const { return scope_inside_with_; }
   // Does this scope contain a with statement.
   bool contains_with() const { return scope_contains_with_; }
 
   // Does this scope access "arguments".
   bool uses_arguments() const { return scope_uses_arguments_; }
   // Does any inner scope access "arguments".
   bool inner_uses_arguments() const { return inner_scope_uses_arguments_; }
   // Does this scope access "super" property (super.foo).
   bool uses_super_property() const { return scope_uses_super_property_; }
 
+  // Whether this needs to be represented by a runtime context.
+  bool NeedsContext() const { return num_heap_slots() > 0; }
+
   bool NeedsHomeObject() const {
     return scope_uses_super_property_ ||
            (scope_calls_eval_ && (IsConciseMethod(function_kind()) ||
                                   IsAccessorFunction(function_kind()) ||
                                   IsConstructor(function_kind())));
   }
 
   const Scope* NearestOuterEvalScope() const {
     if (is_eval_scope()) return this;
     if (outer_scope() == nullptr) return nullptr;
@@ skipping 444 matching lines @@
   PendingCompilationErrorHandler pending_error_handler_;
 
   // For tracking which classes are declared consecutively. Needed for strong
   // mode.
   int class_declaration_group_start_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCOPES_H_