Make class BitField able to use 32 bits of a uint32....

src/utils.h

 // Copyright 2006-2008 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 139 matching lines @@
 template<class T, int shift, int size>
 class BitField {
  public:
   // Tells whether the provided value fits into the bit field.
   static bool is_valid(T value) {
     return (static_cast<uint32_t>(value) & ~((1U << (size)) - 1)) == 0;
   }
 
   // Returns a uint32_t mask of bit field.
   static uint32_t mask() {
-    return (1U << (size + shift)) - (1U << shift);
+    // To use all bits of a uint32 in a bitfield without compiler warnings we
+    // have to compute 2^32 without using a shift count of 32.
+    return ((1U << shift) << size) - (1U << shift);
   }
 
   // Returns a uint32_t with the bit field value encoded.
   static uint32_t encode(T value) {
     ASSERT(is_valid(value));
     return static_cast<uint32_t>(value) << shift;
   }
 
   // Extracts the bit field from the value.
   static T decode(uint32_t value) {
-    return static_cast<T>((value >> shift) & ((1U << (size)) - 1));
+    return static_cast<T>((value & mask()) >> shift);
   }
 };
 
 
 // ----------------------------------------------------------------------------
 // Support for compressed, machine-independent encoding
 // and decoding of integer values of arbitrary size.
 
 // Encoding and decoding from/to a buffer at position p;
 // the result is the position after the encoded integer.
@@ skipping 401 matching lines @@
   }
 }
 
 
 // Calculate 10^exponent.
 int TenToThe(int exponent);
 
 } }  // namespace v8::internal
 
 #endif  // V8_UTILS_H_