[parser] disallow language mode directive in body of function with non-simple parameters

src/parser.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_PARSER_H_
 #define V8_PARSER_H_
 
 #include "src/allocation.h"
 #include "src/ast.h"
 #include "src/compiler.h"  // TODO(titzer): remove this include dependency
@@ skipping 765 matching lines @@
       ZoneList<v8::internal::Statement*>* body, bool* ok);
 
   V8_INLINE Scope* NewScope(Scope* parent_scope, ScopeType scope_type,
                             FunctionKind kind = kNormalFunction);
 
   V8_INLINE void AddFormalParameter(
       ParserFormalParameters* parameters, Expression* pattern,
       Expression* initializer, bool is_rest);
   V8_INLINE void DeclareFormalParameter(
       Scope* scope, const ParserFormalParameters::Parameter& parameter,
-      bool is_simple, ExpressionClassifier* classifier);
-  void ParseArrowFunctionFormalParameters(
-      ParserFormalParameters* parameters, Expression* params,
-      const Scanner::Location& params_loc,
-      Scanner::Location* duplicate_loc, bool* ok);
+      ExpressionClassifier* classifier);
+  void ParseArrowFunctionFormalParameters(ParserFormalParameters* parameters,
+                                          Expression* params,
+                                          const Scanner::Location& params_loc,
+                                          bool* ok);
   void ParseArrowFunctionFormalParameterList(
       ParserFormalParameters* parameters, Expression* params,
       const Scanner::Location& params_loc,
       Scanner::Location* duplicate_loc, bool* ok);
 
   void ReindexLiterals(const ParserFormalParameters& parameters);
 
   // Temporary glue; these functions will move to ParserBase.
   Expression* ParseV8Intrinsic(bool* ok);
   FunctionLiteral* ParseFunctionLiteral(
@@ skipping 524 matching lines @@
                                  ? pattern->AsVariableProxy()->raw_name()
                                  : parser_->ast_value_factory()->empty_string();
   parameters->params.Add(
       ParserFormalParameters::Parameter(name, pattern, initializer, is_rest),
       parameters->scope->zone());
 }
 
 
 void ParserTraits::DeclareFormalParameter(
     Scope* scope, const ParserFormalParameters::Parameter& parameter,
-    bool is_simple, ExpressionClassifier* classifier) {
+    ExpressionClassifier* classifier) {
   bool is_duplicate = false;
+  bool is_simple = classifier->is_simple_parameter_list();
   // TODO(caitp): Remove special handling for rest once desugaring is in.
   auto name = is_simple || parameter.is_rest
       ? parameter.name : parser_->ast_value_factory()->empty_string();
   auto mode = is_simple || parameter.is_rest ? VAR : TEMPORARY;
+  if (!is_simple) scope->SetHasNonSimpleParameters();
   Variable* var =
       scope->DeclareParameter(name, mode, parameter.is_rest, &is_duplicate);
   if (is_duplicate) {
     classifier->RecordDuplicateFormalParameterError(
         parser_->scanner()->location());
   }
   if (is_sloppy(scope->language_mode())) {
     // TODO(sigurds) Mark every parameter as maybe assigned. This is a
     // conservative approximation necessary to account for parameters
     // that are assigned via the arguments array.
@@ skipping 10 matching lines @@
         parser_->BuildParameterInitializationBlock(parameters, ok);
     if (!*ok) return;
     if (init_block != nullptr) {
       body->Add(init_block, parser_->zone());
     }
   }
 }
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_