jdk8-mips64-public/hotspot: src/cpu/ppc/vm/bytes_ppc.hpp@41b780b43b74 (annotated)

src/cpu/ppc/vm/bytes_ppc.hpp@41b780b43b74 (annotated)

src/cpu/ppc/vm/bytes_ppc.hpp

Wed, 27 Nov 2013 16:16:21 -0800

author: goetz
date: Wed, 27 Nov 2013 16:16:21 -0800
changeset 6490: 41b780b43b74
parent 6458: ec28f9c041ff
child 6495: 67fa91961822
permissions: -rw-r--r--

8029015: PPC64 (part 216): opto: trap based null and range checks
Summary: On PPC64 use tdi instruction that does a compare and raises SIGTRAP for NULL and range checks.
Reviewed-by: kvn

 /*
  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
  * Copyright 2012, 2013 SAP AG. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef CPU_PPC_VM_BYTES_PPC_HPP
 #define CPU_PPC_VM_BYTES_PPC_HPP
 #include "memory/allocation.hpp"
 class Bytes: AllStatic {
  public:
   // Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering
   // PowerPC needs to check for alignment.
   // can I count on address always being a pointer to an unsigned char? Yes
   // Returns true, if the byte ordering used by Java is different from the nativ byte ordering
   // of the underlying machine. For example, true for Intel x86, False, for Solaris on Sparc.
   static inline bool is_Java_byte_ordering_different() { return false; }
   // Thus, a swap between native and Java ordering is always a no-op:
   static inline u2   swap_u2(u2 x)  { return x; }
   static inline u4   swap_u4(u4 x)  { return x; }
   static inline u8   swap_u8(u8 x)  { return x; }
   static inline u2   get_native_u2(address p) {
     return (intptr_t(p) & 1) == 0
              ?   *(u2*)p
              :   ( u2(p[0]) << 8 )
                | ( u2(p[1])      );
   }
   static inline u4   get_native_u4(address p) {
     switch (intptr_t(p) & 3) {
      case 0:  return *(u4*)p;
      case 2:  return (  u4( ((u2*)p)[0] ) << 16  )
                    | (  u4( ((u2*)p)[1] )        );
     default:  return ( u4(p[0]) << 24 )
                    | ( u4(p[1]) << 16 )
                    | ( u4(p[2]) <<  8 )
                    |   u4(p[3]);
     }
   }
   static inline u8   get_native_u8(address p) {
     switch (intptr_t(p) & 7) {
       case 0:  return *(u8*)p;
       case 4:  return (  u8( ((u4*)p)[0] ) << 32  )
                     | (  u8( ((u4*)p)[1] )        );
       case 2:  return (  u8( ((u2*)p)[0] ) << 48  )
                     | (  u8( ((u2*)p)[1] ) << 32  )
                     | (  u8( ((u2*)p)[2] ) << 16  )
                     | (  u8( ((u2*)p)[3] )        );
      default:  return ( u8(p[0]) << 56 )
                     | ( u8(p[1]) << 48 )
                     | ( u8(p[2]) << 40 )
                     | ( u8(p[3]) << 32 )
                     | ( u8(p[4]) << 24 )
                     | ( u8(p[5]) << 16 )
                     | ( u8(p[6]) <<  8 )
                     |   u8(p[7]);
     }
   }
   static inline void put_native_u2(address p, u2 x) {
     if ( (intptr_t(p) & 1) == 0 ) { *(u2*)p = x; }
     else {
       p[0] = x >> 8;
       p[1] = x;
     }
   }
   static inline void put_native_u4(address p, u4 x) {
     switch ( intptr_t(p) & 3 ) {
     case 0:  *(u4*)p = x;
               break;
     case 2:  ((u2*)p)[0] = x >> 16;
              ((u2*)p)[1] = x;
              break;
     default: ((u1*)p)[0] = x >> 24;
              ((u1*)p)[1] = x >> 16;
              ((u1*)p)[2] = x >>  8;
              ((u1*)p)[3] = x;
              break;
     }
   }
   static inline void put_native_u8(address p, u8 x) {
     switch ( intptr_t(p) & 7 ) {
     case 0:  *(u8*)p = x;
              break;
     case 4:  ((u4*)p)[0] = x >> 32;
              ((u4*)p)[1] = x;
              break;
     case 2:  ((u2*)p)[0] = x >> 48;
              ((u2*)p)[1] = x >> 32;
              ((u2*)p)[2] = x >> 16;
              ((u2*)p)[3] = x;
              break;
     default: ((u1*)p)[0] = x >> 56;
              ((u1*)p)[1] = x >> 48;
              ((u1*)p)[2] = x >> 40;
              ((u1*)p)[3] = x >> 32;
              ((u1*)p)[4] = x >> 24;
              ((u1*)p)[5] = x >> 16;
              ((u1*)p)[6] = x >>  8;
              ((u1*)p)[7] = x;
     }
   }
   // Efficient reading and writing of unaligned unsigned data in Java byte ordering (i.e. big-endian ordering)
   // (no byte-order reversal is needed since Power CPUs are big-endian oriented).
   static inline u2   get_Java_u2(address p) { return get_native_u2(p); }
   static inline u4   get_Java_u4(address p) { return get_native_u4(p); }
   static inline u8   get_Java_u8(address p) { return get_native_u8(p); }
   static inline void put_Java_u2(address p, u2 x)     { put_native_u2(p, x); }
   static inline void put_Java_u4(address p, u4 x)     { put_native_u4(p, x); }
   static inline void put_Java_u8(address p, u8 x)     { put_native_u8(p, x); }
 };
 #endif // CPU_PPC_VM_BYTES_PPC_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/ppc/vm/bytes_ppc.hpp@41b780b43b74 (annotated)

src/cpu/ppc/vm/bytes_ppc.hpp