Introduce LanguageMode, drop StrictMode.

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/zone.h"
 
@@ skipping 208 matching lines @@
   void RecordSuperPropertyUsage() { scope_uses_super_property_ = true; }
 
   // Inform the scope that the corresponding code invokes "super" constructor.
   void RecordSuperConstructorCallUsage() {
     scope_uses_super_constructor_call_ = true;
   }
 
   // Inform the scope that the corresponding code uses "this".
   void RecordThisUsage() { scope_uses_this_ = true; }
 
-  // Set the strict mode flag (unless disabled by a global flag).
-  void SetStrictMode(StrictMode strict_mode) { strict_mode_ = strict_mode; }
+  // Set the language mode flag (unless disabled by a global flag).
+  void SetLanguageMode(LanguageMode language_mode) {
+    language_mode_ = language_mode;
+  }
 
   // Set the ASM module flag.
   void SetAsmModule() { asm_module_ = true; }
 
   // Position in the source where this scope begins and ends.
   //
   // * For the scope of a with statement
   //     with (obj) stmt
   //   start position: start position of first token of 'stmt'
   //   end position: end position of last token of 'stmt'
@@ skipping 43 matching lines @@
   bool is_script_scope() const { return scope_type_ == SCRIPT_SCOPE; }
   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_eval_scope() || is_function_scope() ||
         is_module_scope() || is_script_scope();
   }
   bool is_strict_eval_scope() const {
-    return is_eval_scope() && strict_mode_ == STRICT;
+    return is_eval_scope() && is_strict(language_mode_);
   }
 
   // Information about which scopes calls eval.
   bool calls_eval() const { return scope_calls_eval_; }
   bool calls_sloppy_eval() {
-    return scope_calls_eval_ && strict_mode_ == SLOPPY;
+    return scope_calls_eval_ && !is_strict(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.
@@ skipping 22 matching lines @@
   // Does any inner scope access "this".
   bool inner_uses_this() const { return inner_scope_uses_this_; }
 
   // ---------------------------------------------------------------------------
   // Accessors.
 
   // The type of this scope.
   ScopeType scope_type() const { return scope_type_; }
 
   // The language mode of this scope.
-  StrictMode strict_mode() const { return strict_mode_; }
+  LanguageMode language_mode() const { return language_mode_; }
 
   // The variable corresponding the 'this' value.
   Variable* receiver() { return receiver_; }
 
   // The variable holding the function literal for named function
   // literals, or NULL.  Only valid for function scopes.
   VariableDeclaration* function() const {
     DCHECK(is_function_scope());
     return function_;
   }
@@ skipping 186 matching lines @@
   // This scope uses "super" property ('super.foo').
   bool scope_uses_super_property_;
   // This scope uses "super" constructor ('super(..)').
   bool scope_uses_super_constructor_call_;
   // This scope uses "this".
   bool scope_uses_this_;
   // This scope contains an "use asm" annotation.
   bool asm_module_;
   // This scope's outer context is an asm module.
   bool asm_function_;
-  // The strict mode of this scope.
-  StrictMode strict_mode_;
+  // The language mode of this scope.
+  LanguageMode language_mode_;
   // Source positions.
   int start_position_;
   int end_position_;
 
   // Computed via PropagateScopeInfo.
   bool outer_scope_calls_sloppy_eval_;
   bool inner_scope_calls_eval_;
   bool inner_scope_uses_arguments_;
   bool inner_scope_uses_super_property_;
   bool inner_scope_uses_super_constructor_call_;
@@ skipping 138 matching lines @@
                    Scope* outer_scope,
                    Handle<ScopeInfo> scope_info);
 
   AstValueFactory* ast_value_factory_;
   Zone* zone_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCOPES_H_