jdk8-mips64-public/hotspot: src/cpu/x86/vm/bytes

7106944: assert(_pc == *pc_addr) failed may be too strong
Reviewed-by: kvn, never

     1 /*

     2  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #ifndef CPU_X86_VM_BYTES_X86_HPP

    26 #define CPU_X86_VM_BYTES_X86_HPP

    28 #include "memory/allocation.hpp"

    30 class Bytes: AllStatic {

    31  private:

    32 #ifndef AMD64

    33   // Helper function for swap_u8

    34   static inline u8   swap_u8_base(u4 x, u4 y);        // compiler-dependent implementation

    35 #endif // AMD64

    37  public:

    38   // Returns true if the byte ordering used by Java is different from the native byte ordering

    39   // of the underlying machine. For example, this is true for Intel x86, but false for Solaris

    40   // on Sparc.

    41   static inline bool is_Java_byte_ordering_different(){ return true; }

    44   // Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering

    45   // (no special code is needed since x86 CPUs can access unaligned data)

    46   static inline u2   get_native_u2(address p)         { return *(u2*)p; }

    47   static inline u4   get_native_u4(address p)         { return *(u4*)p; }

    48   static inline u8   get_native_u8(address p)         { return *(u8*)p; }

    50   static inline void put_native_u2(address p, u2 x)   { *(u2*)p = x; }

    51   static inline void put_native_u4(address p, u4 x)   { *(u4*)p = x; }

    52   static inline void put_native_u8(address p, u8 x)   { *(u8*)p = x; }

    55   // Efficient reading and writing of unaligned unsigned data in Java

    56   // byte ordering (i.e. big-endian ordering). Byte-order reversal is

    57   // needed since x86 CPUs use little-endian format.

    58   static inline u2   get_Java_u2(address p)           { return swap_u2(get_native_u2(p)); }

    59   static inline u4   get_Java_u4(address p)           { return swap_u4(get_native_u4(p)); }

    60   static inline u8   get_Java_u8(address p)           { return swap_u8(get_native_u8(p)); }

    62   static inline void put_Java_u2(address p, u2 x)     { put_native_u2(p, swap_u2(x)); }

    63   static inline void put_Java_u4(address p, u4 x)     { put_native_u4(p, swap_u4(x)); }

    64   static inline void put_Java_u8(address p, u8 x)     { put_native_u8(p, swap_u8(x)); }

    67   // Efficient swapping of byte ordering

    68   static inline u2   swap_u2(u2 x);                   // compiler-dependent implementation

    69   static inline u4   swap_u4(u4 x);                   // compiler-dependent implementation

    70   static inline u8   swap_u8(u8 x);

    71 };

    74 // The following header contains the implementations of swap_u2, swap_u4, and swap_u8[_base]

    75 #ifdef TARGET_OS_ARCH_linux_x86

    76 # include "bytes_linux_x86.inline.hpp"

    77 #endif

    78 #ifdef TARGET_OS_ARCH_solaris_x86

    79 # include "bytes_solaris_x86.inline.hpp"

    80 #endif

    81 #ifdef TARGET_OS_ARCH_windows_x86

    82 # include "bytes_windows_x86.inline.hpp"

    83 #endif

    84 #ifdef TARGET_OS_ARCH_bsd_x86

    85 # include "bytes_bsd_x86.inline.hpp"

    86 #endif

    89 #endif // CPU_X86_VM_BYTES_X86_HPP

src/cpu/x86/vm/bytes_x86.hpp@448691f285a5