19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #ifndef CPU_ZERO_VM_BYTES_ZERO_HPP
  27 #define CPU_ZERO_VM_BYTES_ZERO_HPP
  28 
  29 #include "memory/allocation.hpp"
  30 
  31 typedef union unaligned {
  32   u4 u;
  33   u2 us;
  34   u8 ul;
  35 } __attribute__((packed)) unaligned;
  36 
  37 class Bytes: AllStatic {
  38  public:
  39   // Returns true if the byte ordering used by Java is different
  40   // from the native byte ordering of the underlying machine.
  41   static inline bool is_Java_byte_ordering_different() {
  42 #ifdef VM_LITTLE_ENDIAN
  43     return true;
  44 #else
  45     return false;
  46 #endif
  47   }
  48 
  49   // Efficient reading and writing of unaligned unsigned data in
  50   // platform-specific byte ordering.
  51   static inline u2 get_native_u2(address p){
  52     unaligned *up = (unaligned *) p;
  53     return up->us;
  54   }
  55 
  56   static inline u4 get_native_u4(address p) {
  57     unaligned *up = (unaligned *) p;
  58     return up->u;
  59   }
  60 
  61   static inline u8 get_native_u8(address p) {
  62     unaligned *up = (unaligned *) p;
  63     return up->ul;
  64   }
  65 
  66   static inline void put_native_u2(address p, u2 x) {
  67     unaligned *up = (unaligned *) p;
  68     up->us = x;

  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #ifndef CPU_ZERO_VM_BYTES_ZERO_HPP
  27 #define CPU_ZERO_VM_BYTES_ZERO_HPP
  28 
  29 #include "memory/allocation.hpp"
  30 
  31 typedef union unaligned {
  32   u4 u;
  33   u2 us;
  34   u8 ul;
  35 } __attribute__((packed)) unaligned;
  36 
  37 class Bytes: AllStatic {
  38  public:










  39   // Efficient reading and writing of unaligned unsigned data in
  40   // platform-specific byte ordering.
  41   static inline u2 get_native_u2(address p){
  42     unaligned *up = (unaligned *) p;
  43     return up->us;
  44   }
  45 
  46   static inline u4 get_native_u4(address p) {
  47     unaligned *up = (unaligned *) p;
  48     return up->u;
  49   }
  50 
  51   static inline u8 get_native_u8(address p) {
  52     unaligned *up = (unaligned *) p;
  53     return up->ul;
  54   }
  55 
  56   static inline void put_native_u2(address p, u2 x) {
  57     unaligned *up = (unaligned *) p;
  58     up->us = x;