A64: Synchronize with r15358.

src/globals.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 144 matching lines @@
 #define USE_SIMULATOR 1
 #endif
 #if (defined(V8_TARGET_ARCH_ARM) && !defined(V8_HOST_ARCH_ARM))
 #define USE_SIMULATOR 1
 #endif
 #if (defined(V8_TARGET_ARCH_MIPS) && !defined(V8_HOST_ARCH_MIPS))
 #define USE_SIMULATOR 1
 #endif
 #endif
 
+// Determine architecture endiannes (we only support little-endian).
+#if defined(V8_TARGET_ARCH_IA32)
+#define V8_TARGET_LITTLE_ENDIAN 1
+#elif defined(V8_TARGET_ARCH_X64)
+#define V8_TARGET_LITTLE_ENDIAN 1
+#elif defined(V8_TARGET_ARCH_ARM)
+#define V8_TARGET_LITTLE_ENDIAN 1
+#elif defined(V8_TARGET_ARCH_A64)
+#define V8_TARGET_LITTLE_ENDIAN 1
+#elif defined(V8_TARGET_ARCH_MIPS)
+#define V8_TARGET_LITTLE_ENDIAN 1
+#else
+#error Unknown target architecture endiannes
+#endif
+
 // Support for alternative bool type. This is only enabled if the code is
 // compiled with USE_MYBOOL defined. This catches some nasty type bugs.
 // For instance, 'bool b = "false";' results in b == true! This is a hidden
 // source of bugs.
 // However, redefining the bool type does have some negative impact on some
 // platforms. It gives rise to compiler warnings (i.e. with
 // MSVC) in the API header files when mixing code that uses the standard
 // bool with code that uses the redefined version.
 // This does not actually belong in the platform code, but needs to be
 // defined here because the platform code uses bool, and platform.h is
@@ skipping 231 matching lines @@
 // neither in strict nor extended mode. However, the more distinguishing term
 // 'classic mode' is used in V8 instead to avoid mix-ups.
 
 enum LanguageMode {
   CLASSIC_MODE,
   STRICT_MODE,
   EXTENDED_MODE
 };
 
 
+// A simple Maybe type, that can be passed by value.
+template<class T>
+struct Maybe {
+  Maybe() : has_value(false) {}
+  explicit Maybe(T t) : has_value(true), value(t) {}
+  Maybe(bool has, T t) : has_value(has), value(t) {}
+
+  bool has_value;
+  T value;
+};
+
+
 // The Strict Mode (ECMA-262 5th edition, 4.2.2).
 //
 // This flag is used in the backend to represent the language mode. So far
 // there is no semantic difference between the strict and the extended mode in
 // the backend, so both modes are represented by the kStrictMode value.
 enum StrictModeFlag {
   kNonStrictMode,
   kStrictMode
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_GLOBALS_H_