Reintroduce duplicate identifier detection in preparser.

src/platform.h

 // Copyright 2011 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 26 matching lines @@
 // the platform dependent classes could have been implemented using abstract
 // superclasses with virtual methods and having specializations for each
 // platform. This design was rejected because it was more complicated and
 // slower. It would require factory methods for selecting the right
 // implementation and the overhead of virtual methods for performance
 // sensitive like mutex locking/unlocking.
 
 #ifndef V8_PLATFORM_H_
 #define V8_PLATFORM_H_
 
-#define V8_INFINITY INFINITY
+#ifdef __sun
+# ifndef signbit
+int signbit(double x);
+# endif
+#endif
+
+// GCC specific stuff
+#ifdef __GNUC__
+
+// Needed for va_list on at least MinGW and Android.
+#include <stdarg.h>
+
+#define __GNUC_VERSION__ (__GNUC__ * 10000 + __GNUC_MINOR__ * 100)
+
+#endif  // __GNUC__
+
 
 // Windows specific stuff.
 #ifdef WIN32
 
 // Microsoft Visual C++ specific stuff.
 #ifdef _MSC_VER
 
-enum {
-  FP_NAN,
-  FP_INFINITE,
-  FP_ZERO,
-  FP_SUBNORMAL,
-  FP_NORMAL
-};
-
-#undef V8_INFINITY
-#define V8_INFINITY HUGE_VAL
-
-namespace v8 {
-namespace internal {
-int isfinite(double x);
-} }
-int isnan(double x);
-int isinf(double x);
-int isless(double x, double y);
-int isgreater(double x, double y);
-int fpclassify(double x);
-int signbit(double x);
+#include "win32-math.h"
 
 int strncasecmp(const char* s1, const char* s2, int n);
 
 #endif  // _MSC_VER
 
 // Random is missing on both Visual Studio and MinGW.
 int random();
 
 #endif  // WIN32
 
-
-#ifdef __sun
-# ifndef signbit
-int signbit(double x);
-# endif
-#endif
-
-
-// GCC specific stuff
-#ifdef __GNUC__
-
-// Needed for va_list on at least MinGW and Android.
-#include <stdarg.h>
-
-#define __GNUC_VERSION__ (__GNUC__ * 10000 + __GNUC_MINOR__ * 100)
-
-// Unfortunately, the INFINITY macro cannot be used with the '-pedantic'
-// warning flag and certain versions of GCC due to a bug:
-// http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11931
-// For now, we use the more involved template-based version from <limits>, but
-// only when compiling with GCC versions affected by the bug (2.96.x - 4.0.x)
-// __GNUC_PREREQ is not defined in GCC for Mac OS X, so we define our own macro
-#if __GNUC_VERSION__ >= 29600 && __GNUC_VERSION__ < 40100
-#include <limits>
-#undef V8_INFINITY
-#define V8_INFINITY std::numeric_limits<double>::infinity()
-#endif
-
-#endif  // __GNUC__
-
 #include "atomicops.h"
 #include "platform-tls.h"
 #include "utils.h"
 #include "v8globals.h"
 
 namespace v8 {
 namespace internal {
 
 // Use AtomicWord for a machine-sized pointer. It is assumed that
 // reads and writes of naturally aligned values of this type are atomic.
@@ skipping 535 matching lines @@
   Atomic32 active_;
   PlatformData* data_;  // Platform specific data.
   int samples_taken_;  // Counts stack samples taken.
   DISALLOW_IMPLICIT_CONSTRUCTORS(Sampler);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_H_