gcconfig.h

gcc的组建

#           include <ia64intrin.h>
#	    define PREFETCH(x) \
	      __lfetch(__lfhint_none, (x))
#	    define PREFETCH_FOR_WRITE(x) \
	      __lfetch(__lfhint_nta,  (x))
#	    define CLEAR_DOUBLE(x) \
	      __stf_spill((void *)(x), 0)
#	  endif // __INTEL_COMPILER
#       endif
#   endif
#   ifdef MSWIN32
      /* FIXME: This is a very partial guess.  There is no port, yet.	*/
#     define OS_TYPE "MSWIN32"
		/* STACKBOTTOM and DATASTART are handled specially in 	*/
		/* os_dep.c.						*/
#     define DATAEND  /* not needed */
#     if defined(_WIN64)
#       define CPP_WORDSZ 64
#     else
#       define CPP_WORDSZ 32   /* Is this possible?	*/
#     endif
#     define ALIGNMENT 8
#   endif
# endif

# ifdef M88K
#   define MACH_TYPE "M88K"
#   define ALIGNMENT 4
#   define ALIGN_DOUBLE
    extern int etext[];
#   ifdef CX_UX
#	define OS_TYPE "CX_UX"
#       define DATASTART ((((word)etext + 0x3fffff) & ~0x3fffff) + 0x10000)
#   endif
#   ifdef  DGUX
#	define OS_TYPE "DGUX"
	extern ptr_t GC_SysVGetDataStart();
#       define DATASTART GC_SysVGetDataStart(0x10000, etext)
#   endif
#   define STACKBOTTOM ((char*)0xf0000000) /* determined empirically */
# endif

# ifdef S370
    /* If this still works, and if anyone cares, this should probably	*/
    /* be moved to the S390 category.					*/
#   define MACH_TYPE "S370"
#   define ALIGNMENT 4	/* Required by hardware	*/
#   define USE_GENERIC_PUSH_REGS
#   ifdef UTS4
#       define OS_TYPE "UTS4"
       extern int etext[];
	extern int _etext[];
	extern int _end[];
	extern ptr_t GC_SysVGetDataStart();
#       define DATASTART GC_SysVGetDataStart(0x10000, _etext)
#	define DATAEND (_end)
#	define HEURISTIC2
#   endif
# endif

# ifdef S390
#   define MACH_TYPE "S390"
#   define USE_GENERIC_PUSH_REGS
#   ifndef __s390x__
#   define ALIGNMENT 4
#   define CPP_WORDSZ 32
#   else
#   define ALIGNMENT 8
#   define CPP_WORDSZ 64
#   define HBLKSIZE 4096
#   endif
#   ifdef LINUX
#       define OS_TYPE "LINUX"
#       define LINUX_STACKBOTTOM
#       define DYNAMIC_LOADING
       extern int __data_start[];
#       define DATASTART ((ptr_t)(__data_start))
    extern int _end[];
#   define DATAEND (_end)
#   define CACHE_LINE_SIZE 256
#   define GETPAGESIZE() 4096
#   endif
# endif

# if defined(PJ)
#   define ALIGNMENT 4
    extern int _etext[];
#   define DATASTART ((ptr_t)(_etext))
#   define HEURISTIC1
# endif

# ifdef ARM32
#   define CPP_WORDSZ 32
#   define MACH_TYPE "ARM32"
#   define ALIGNMENT 4
#   ifdef NETBSD
#       define OS_TYPE "NETBSD"
#       define HEURISTIC2
#	ifdef __ELF__
#          define DATASTART GC_data_start
#	   define DYNAMIC_LOADING
#	else
           extern char etext[];
#          define DATASTART ((ptr_t)(etext))
#	endif
#       define USE_GENERIC_PUSH_REGS
#   endif
#   ifdef LINUX
#       define OS_TYPE "LINUX"
#       define LINUX_STACKBOTTOM
#       undef STACK_GRAN
#       define STACK_GRAN 0x10000000
#       define USE_GENERIC_PUSH_REGS
#       ifdef __ELF__
#            define DYNAMIC_LOADING
#	     include <features.h>
#	     if defined(__GLIBC__) && __GLIBC__ >= 2
#		 define SEARCH_FOR_DATA_START
#	     else
     	         extern char **__environ;
#                define DATASTART ((ptr_t)(&__environ))
			      /* hideous kludge: __environ is the first */
			      /* word in crt0.o, and delimits the start */
			      /* of the data segment, no matter which   */
			      /* ld options were passed through.        */
			      /* We could use _etext instead, but that  */
			      /* would include .rodata, which may       */
			      /* contain large read-only data tables    */
			      /* that we'd rather not scan.		*/
#	     endif
	     extern int _end[];
#	     define DATAEND (_end)
#	else
	     extern int etext[];
#            define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
#       endif
#   endif
#   ifdef MSWINCE
#     define OS_TYPE "MSWINCE"
#     define DATAEND /* not needed */
#   endif
#   ifdef NOSYS
      /* __data_start is usually defined in the target linker script.  */
      extern int __data_start[];
#     define DATASTART (ptr_t)(__data_start)
#     define USE_GENERIC_PUSH_REGS
      /* __stack_base__ is set in newlib/libc/sys/arm/crt0.S  */
      extern void *__stack_base__;
#     define STACKBOTTOM ((ptr_t) (__stack_base__))
#   endif
#endif

# ifdef CRIS
#   define MACH_TYPE "CRIS"
#   define CPP_WORDSZ 32
#   define ALIGNMENT 1
#   define OS_TYPE "LINUX"
#   define DYNAMIC_LOADING
#   define LINUX_STACKBOTTOM
#   define USE_GENERIC_PUSH_REGS
#   define SEARCH_FOR_DATA_START
      extern int _end[];
#   define DATAEND (_end)
# endif

# ifdef SH
#   define MACH_TYPE "SH"
#   define ALIGNMENT 4
#   ifdef MSWINCE
#     define OS_TYPE "MSWINCE"
#     define DATAEND /* not needed */
#   endif
#   ifdef LINUX
#     define OS_TYPE "LINUX"
#     define LINUX_STACKBOTTOM
#     define USE_GENERIC_PUSH_REGS
#     define DYNAMIC_LOADING
#     define SEARCH_FOR_DATA_START
      extern int _end[];
#     define DATAEND (_end)
#   endif
# endif
 
# ifdef SH4
#   define MACH_TYPE "SH4"
#   define OS_TYPE "MSWINCE"
#   define ALIGNMENT 4
#   define DATAEND /* not needed */
# endif

# ifdef M32R
#   define CPP_WORDSZ 32
#   define MACH_TYPE "M32R"
#   define ALIGNMENT 4
#   ifdef LINUX
#     define OS_TYPE "LINUX"
#     define LINUX_STACKBOTTOM
#     undef STACK_GRAN
#     define STACK_GRAN 0x10000000
#     define USE_GENERIC_PUSH_REGS
#     define DYNAMIC_LOADING
#     define SEARCH_FOR_DATA_START
      extern int _end[];
#     define DATAEND (_end)
#   endif
# endif

# ifdef X86_64
#   define MACH_TYPE "X86_64"
#   define ALIGNMENT 8
#   define CPP_WORDSZ 64
#   ifndef HBLKSIZE
#     define HBLKSIZE 4096
#   endif
#   define CACHE_LINE_SIZE 64
#   define USE_GENERIC_PUSH_REGS
#   ifdef LINUX
#	define OS_TYPE "LINUX"
#       define LINUX_STACKBOTTOM
#       if !defined(GC_LINUX_THREADS) || !defined(REDIRECT_MALLOC)
#	    define MPROTECT_VDB
#	else
	    /* We seem to get random errors in incremental mode,	*/
	    /* possibly because Linux threads is itself a malloc client */
	    /* and can't deal with the signals.				*/
#	endif
#       ifdef __ELF__
#            define DYNAMIC_LOADING
#	     ifdef UNDEFINED	/* includes ro data */
	       extern int _etext[];
#              define DATASTART ((ptr_t)((((word) (_etext)) + 0xfff) & ~0xfff))
#	     endif
#	     include <features.h>
#	     define SEARCH_FOR_DATA_START
	     extern int _end[];
#	     define DATAEND (_end)
#	else
	     extern int etext[];
#            define DATASTART ((ptr_t)((((word) (etext)) + 0xfff) & ~0xfff))
#       endif
#       if defined(__GNUC__) && __GNUC >= 3
#	    define PREFETCH(x) __builtin_prefetch((x), 0, 0)
#	    define PREFETCH_FOR_WRITE(x) __builtin_prefetch((x), 1)
#	endif
#   endif
#   ifdef NETBSD
#	define OS_TYPE "NETBSD"
#	ifdef __ELF__
#	    define DYNAMIC_LOADING
#	endif
#	define HEURISTIC2
	extern char etext[];
#	define SEARCH_FOR_DATA_START
#   endif
# endif

#if defined(LINUX) && defined(USE_MMAP)
    /* The kernel may do a somewhat better job merging mappings etc.	*/
    /* with anonymous mappings.						*/
#   define USE_MMAP_ANON
#endif

#if defined(LINUX) && defined(REDIRECT_MALLOC)
    /* Rld appears to allocate some memory with its own allocator, and	*/
    /* some through malloc, which might be redirected.  To make this	*/
    /* work with collectable memory, we have to scan memory allocated	*/
    /* by rld's internal malloc.					*/
#   define USE_PROC_FOR_LIBRARIES
#endif
    
# ifndef STACK_GROWS_UP
#   define STACK_GROWS_DOWN
# endif

# ifndef CPP_WORDSZ
#   define CPP_WORDSZ 32
# endif

# ifndef OS_TYPE
#   define OS_TYPE ""
# endif

# ifndef DATAEND
    extern int end[];
#   define DATAEND (end)
# endif

# if defined(SVR4) && !defined(GETPAGESIZE)
#    include <unistd.h>
#    define GETPAGESIZE()  sysconf(_SC_PAGESIZE)
# endif

# ifndef GETPAGESIZE
#   if defined(SUNOS5) || defined(IRIX5)
#	include <unistd.h>
#   endif
#   define GETPAGESIZE() getpagesize()
# endif

# if defined(SUNOS5) || defined(DRSNX) || defined(UTS4)
	    /* OS has SVR4 generic features.  Probably others also qualify.	*/
#   define SVR4
# endif

# if defined(SUNOS5) || defined(DRSNX)
	    /* OS has SUNOS5 style semi-undocumented interface to dynamic 	*/
	    /* loader.								*/
#   define SUNOS5DL
	    /* OS has SUNOS5 style signal handlers.				*/
#   define SUNOS5SIGS
# endif

# if defined(HPUX)
#   define SUNOS5SIGS
# endif

# if defined(FREEBSD) && (__FreeBSD__ >= 4)
#   define SUNOS5SIGS
# endif

# if defined(SVR4) || defined(LINUX) || defined(IRIX5) || defined(HPUX) \
	    || defined(OPENBSD) || defined(NETBSD) || defined(FREEBSD) \
	    || defined(DGUX) || defined(BSD) || defined(SUNOS4) \
	    || defined(_AIX) || defined(DARWIN) || defined(OSF1)
#   define UNIX_LIKE   /* Basic Unix-like system calls work.	*/
# endif

# if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
	   -> bad word size
# endif

# ifdef PCR
#   undef DYNAMIC_LOADING
#   undef STACKBOTTOM
#   undef HEURISTIC1
#   undef HEURISTIC2
#   undef PROC_VDB
#   undef MPROTECT_VDB
#   define PCR_VDB
# endif

# ifdef SRC_M3
	/* Postponed for now. */
#   undef PROC_VDB
#   undef MPROTECT_VDB
# endif

# ifdef SMALL_CONFIG
	/* Presumably not worth the space it takes. */
#   undef PROC_VDB
#   undef MPROTECT_VDB
# endif

# ifdef USE_MUNMAP
#   undef MPROTECT_VDB  /* Can't deal with address space holes. */
# endif

# ifdef PARALLEL_MARK
#   undef MPROTECT_VDB  /* For now.	*/
# endif

# if !defined(PCR_VDB) && !defined(PROC_VDB) && !defined(MPROTECT_VDB)
#   define DEFAULT_VDB
# endif

# ifndef PREFETCH
#   define PREFETCH(x)
#   define NO_PREFETCH
# endif

# ifndef PREFETCH_FOR_WRITE
#   define PREFETCH_FOR_WRITE(x)
#   define NO_PREFETCH_FOR_WRITE
# endif

# ifndef CACHE_LINE_SIZE
#   define CACHE_LINE_SIZE 32	/* Wild guess	*/
# endif

# ifdef LINUX
#   define REGISTER_LIBRARIES_EARLY
    /* We sometimes use dl_iterate_phdr, which may acquire an internal	*/
    /* lock.  This isn't safe after the world has stopped.  So we must	*/
    /* call GC_register_dynamic_libraries before stopping the world.	*/
    /* For performance reasons, this may be beneficial on other		*/
    /* platforms as well, though it should be avoided in win32.		*/
# endif /* LINUX */

# if defined(SEARCH_FOR_DATA_START)
    extern ptr_t GC_data_start;
#   define DATASTART GC_data_start
# endif

# ifndef CLEAR_DOUBLE
#   define CLEAR_DOUBLE(x) \
		((word*)x)[0] = 0; \
		((word*)x)[1] = 0;
# endif /* CLEAR_DOUBLE */

	/* Internally we use GC_SOLARIS_THREADS to test for either old or pthreads. */
# if defined(GC_SOLARIS_PTHREADS) && !defined(GC_SOLARIS_THREADS)
#   define GC_SOLARIS_THREADS
# endif

# if defined(GC_IRIX_THREADS) && !defined(IRIX5)
	--> inconsistent configuration
# endif
# if defined(GC_LINUX_THREADS) && !defined(LINUX)
	--> inconsistent configuration
# endif
# if defined(GC_SOLARIS_THREADS) && !defined(SUNOS5)
	--> inconsistent configuration
# endif
# if defined(GC_HPUX_THREADS) && !defined(HPUX)
	--> inconsistent configuration
# endif
# if defined(GC_AIX_THREADS) && !defined(_AIX)
	--> inconsistent configuration
# endif
# if defi