Introduce LanguageMode, drop StrictMode.

src/globals.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_GLOBALS_H_
 #define V8_GLOBALS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 207 matching lines @@
 // (sorted alphabetically)
 
 class FreeStoreAllocationPolicy;
 template <typename T, class P = FreeStoreAllocationPolicy> class List;
 
 // -----------------------------------------------------------------------------
 // Declarations for use in both the preparser and the rest of V8.
 
 // The Strict Mode (ECMA-262 5th edition, 4.2.2).
 
-enum StrictMode { SLOPPY, STRICT };
+enum LanguageMode {
+  // LanguageMode is expressed as a bitmask. Descriptions of the bits:
+  STRICT = 1 << 0,
+  LANGUAGE_END,
 
+  // Shorthands for some common language modes.
+  SLOPPY = 0
+};
+
+inline bool is_strict(LanguageMode language_mode) {
+  return language_mode & STRICT;
+}
+
+inline bool is_sloppy(LanguageMode language_mode) {
+  return (language_mode & STRICT) == 0;
+}
+
+inline bool is_valid_language_mode(int language_mode) {
+  return language_mode == SLOPPY || language_mode == STRICT;
+}
 
 // Mask for the sign bit in a smi.
 const intptr_t kSmiSignMask = kIntptrSignBit;
 
 const int kObjectAlignmentBits = kPointerSizeLog2;
 const intptr_t kObjectAlignment = 1 << kObjectAlignmentBits;
 const intptr_t kObjectAlignmentMask = kObjectAlignment - 1;
 
 // Desired alignment for pointers.
 const intptr_t kPointerAlignment = (1 << kPointerSizeLog2);
@@ skipping 579 matching lines @@
 
 inline bool IsSubclassConstructor(FunctionKind kind) {
   DCHECK(IsValidFunctionKind(kind));
   return kind & FunctionKind::kSubclassConstructor;
 }
 } }  // namespace v8::internal
 
 namespace i = v8::internal;
 
 #endif  // V8_GLOBALS_H_