Reintroduce duplicate identifier detection in preparser.

src/conversions.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
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 #include <stdarg.h>
+#include <math.h>
 #include <limits.h>
 
 #include "conversions-inl.h"
 #include "dtoa.h"
 #include "scanner-base.h"
 #include "strtod.h"
 #include "utils.h"
 
 namespace v8 {
 namespace internal {
 
 
-
 double StringToDouble(UnicodeCache* unicode_cache,
                       const char* str, int flags, double empty_string_val) {
   const char* end = str + StrLength(str);
   return InternalStringToDouble(unicode_cache, str, end, flags,
                                 empty_string_val);
 }
 
 
 double StringToDouble(UnicodeCache* unicode_cache,
                       Vector<const char> str,
@@ skipping 331 matching lines @@
 
   // Get the integer part and the decimal part.
   double integer_part = floor(value);
   double decimal_part = value - integer_part;
 
   // Convert the integer part starting from the back.  Always generate
   // at least one digit.
   int integer_pos = kBufferSize - 2;
   do {
     integer_buffer[integer_pos--] =
-        chars[static_cast<int>(modulo(integer_part, radix))];
+        chars[static_cast<int>(fmod(integer_part, radix))];
     integer_part /= radix;
   } while (integer_part >= 1.0);
   // Sanity check.
   ASSERT(integer_pos > 0);
   // Add sign if needed.
   if (is_negative) integer_buffer[integer_pos--] = '-';
 
   // Convert the decimal part.  Repeatedly multiply by the radix to
   // generate the next char.  Never generate more than kBufferSize - 1
   // chars.
@@ skipping 20 matching lines @@
   if (decimal_pos > 0) result_size++;
   // Allocate result and fill in the parts.
   SimpleStringBuilder builder(result_size + 1);
   builder.AddSubstring(integer_buffer + integer_pos + 1, integer_part_size);
   if (decimal_pos > 0) builder.AddCharacter('.');
   builder.AddSubstring(decimal_buffer, decimal_pos);
   return builder.Finalize();
 }
 
 } }  // namespace v8::internal