Introduce LanguageMode, drop StrictMode.

src/compiler.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_COMPILER_H_
 #define V8_COMPILER_H_
 
 #include "src/allocation.h"
 #include "src/ast.h"
 #include "src/bailout-reason.h"
@@ skipping 90 matching lines @@
 
   Isolate* isolate() const {
     return isolate_;
   }
   Zone* zone() { return zone_; }
   bool is_osr() const { return !osr_ast_id_.IsNone(); }
   bool is_lazy() const { return GetFlag(kLazy); }
   bool is_eval() const { return GetFlag(kEval); }
   bool is_global() const { return GetFlag(kGlobal); }
   bool is_module() const { return GetFlag(kModule); }
-  StrictMode strict_mode() const {
+  LanguageMode language_mode() const {
+    STATIC_ASSERT(LANGUAGE_END == 2);
     return GetFlag(kStrictMode) ? STRICT : SLOPPY;
   }
   FunctionLiteral* function() const { return function_; }
   Scope* scope() const { return scope_; }
   Scope* script_scope() const { return script_scope_; }
   Handle<Code> code() const { return code_; }
   Handle<JSFunction> closure() const { return closure_; }
   Handle<SharedFunctionInfo> shared_info() const { return shared_info_; }
   Handle<Script> script() const { return script_; }
   void set_script(Handle<Script> script) { script_ = script; }
@@ skipping 36 matching lines @@
     DCHECK(IsStub());
     parameter_count_ = parameter_count;
   }
 
   void set_this_has_uses(bool has_no_uses) {
     SetFlag(kThisHasUses, has_no_uses);
   }
 
   bool this_has_uses() { return GetFlag(kThisHasUses); }
 
-  void SetStrictMode(StrictMode strict_mode) {
-    SetFlag(kStrictMode, strict_mode == STRICT);
+  void SetLanguageMode(LanguageMode language_mode) {
+    STATIC_ASSERT(LANGUAGE_END == 2);
+    SetFlag(kStrictMode, language_mode & STRICT);
   }
 
   void MarkAsNative() { SetFlag(kNative); }
 
   bool is_native() const { return GetFlag(kNative); }
 
   bool is_calling() const {
     return GetFlag(kDeferredCalling) || GetFlag(kNonDeferredCalling);
   }
 
@@ skipping 528 matching lines @@
   static bool EnsureDeoptimizationSupport(CompilationInfo* info);
 
   static bool EnsureCompiled(Handle<JSFunction> function,
                              ClearExceptionFlag flag);
 
   static void CompileForLiveEdit(Handle<Script> script);
 
   // Compile a String source within a context for eval.
   MUST_USE_RESULT static MaybeHandle<JSFunction> GetFunctionFromEval(
       Handle<String> source, Handle<SharedFunctionInfo> outer_info,
-      Handle<Context> context, StrictMode strict_mode,
+      Handle<Context> context, LanguageMode language_mode,
       ParseRestriction restriction, int scope_position);
 
   // Compile a String source within a context.
   static Handle<SharedFunctionInfo> CompileScript(
       Handle<String> source, Handle<Object> script_name, int line_offset,
       int column_offset, bool is_debugger_script, bool is_shared_cross_origin,
       Handle<Context> context, v8::Extension* extension,
       ScriptData** cached_data, ScriptCompiler::CompileOptions compile_options,
       NativesFlag is_natives_code);
 
@@ skipping 44 matching lines @@
   Zone zone_;
   unsigned info_zone_start_allocation_size_;
   base::ElapsedTimer timer_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationPhase);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILER_H_