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00001 /*
00002     aligncheck: Some insane hacking to ensure stack alignment on library entry.
00003 
00004     copyright 2010 by the mpg123 project - free software under the terms of the LGPL 2.1
00005     see COPYING and AUTHORS files in distribution or http://mpg123.org
00006 
00007     intially written by Thomas Orgis
00008 
00009     Include this header once at the appropriate place. It is not supposed for general use...
00010 */
00011 
00012 
00013 #define ALIGNCHECK(mh)
00014 #define ALIGNCHECKK
00015 /* On compilers that support data alignment but not the automatic stack realignment.
00016    We check for properly aligned stack before risking a crash because of badly compiled
00017    client program. */
00018 #if (defined CCALIGN) && (defined NEED_ALIGNCHECK) && ((defined DEBUG) || (defined CHECK_ALIGN))
00019 
00020 /* Common building block. */
00021 #define ALIGNMAINPART \
00022     /* minimum size of 16 bytes, not all compilers would align a smaller piece of data */ \
00023     double ALIGNED(16) altest[2]; \
00024     debug2("testing alignment, with %lu %% 16 = %lu", \
00025         (unsigned long)altest, (unsigned long)((size_t)altest % 16)); \
00026     if((size_t)altest % 16 != 0)
00027 
00028 #undef ALIGNCHECK
00029 #define ALIGNCHECK(mh) \
00030     ALIGNMAINPART \
00031     { \
00032         error("Stack variable is not aligned! Your combination of compiler/library is dangerous!"); \
00033         if(mh != NULL) mh->err = MPG123_BAD_ALIGN; \
00034 \
00035         return MPG123_ERR; \
00036     }
00037 #undef ALIGNCHECKK
00038 #define ALIGNCHECKK \
00039     ALIGNMAINPART \
00040     { \
00041         error("Stack variable is not aligned! Your combination of compiler/library is dangerous!"); \
00042         return MPG123_BAD_ALIGN; \
00043     }
00044 
00045 #endif
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