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/* -----------------------------------------------------------------------------
 *
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 * (c) The GHC Team, 2000-2004
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 *
 * RTS Object Linker
 *
 * ---------------------------------------------------------------------------*/

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#if 0
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#include "PosixSource.h"
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#endif
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/* Linux needs _GNU_SOURCE to get RTLD_DEFAULT from <dlfcn.h> and
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   MREMAP_MAYMOVE from <sys/mman.h>.
 */
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#ifdef __linux__
#define _GNU_SOURCE
#endif

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#include "Rts.h"
#include "HsFFI.h"
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#include "sm/Storage.h"
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#include "Stats.h"
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#include "Hash.h"
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#include "LinkerInternals.h"
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#include "RtsUtils.h"
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#include "Trace.h"
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#include "StgPrimFloat.h" // for __int_encodeFloat etc.
#include "Stable.h"

#if !defined(mingw32_HOST_OS)
#include "posix/Signals.h"
#endif
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif

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#include <stdlib.h>
#include <string.h>
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#include <stdio.h>
#include <assert.h>
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if defined(HAVE_DLFCN_H)
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#include <dlfcn.h>
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#endif
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#if defined(cygwin32_HOST_OS)
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#ifdef HAVE_DIRENT_H
#include <dirent.h>
#endif

#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <regex.h>
#include <sys/fcntl.h>
#include <sys/termios.h>
#include <sys/utime.h>
#include <sys/utsname.h>
#include <sys/wait.h>
#endif

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#if defined(ia64_HOST_ARCH) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS) || defined(dragonfly_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
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#define USE_MMAP
#include <fcntl.h>
#include <sys/mman.h>
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#if defined(linux_HOST_OS) || defined(freebsd_HOST_OS) || defined(dragonfly_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
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#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#endif

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#endif

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#if defined(linux_HOST_OS) || defined(solaris2_HOST_OS) || defined(freebsd_HOST_OS) || defined(dragonfly_HOST_OS) || defined(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
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#  define OBJFORMAT_ELF
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#  include <regex.h>	// regex is already used by dlopen() so this is OK
			// to use here without requiring an additional lib
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#elif defined(cygwin32_HOST_OS) || defined (mingw32_HOST_OS)
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#  define OBJFORMAT_PEi386
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#  include <windows.h>
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#  include <math.h>
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#elif defined(darwin_HOST_OS)
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#  define OBJFORMAT_MACHO
#  include <mach-o/loader.h>
#  include <mach-o/nlist.h>
#  include <mach-o/reloc.h>
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#if !defined(HAVE_DLFCN_H)
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#  include <mach-o/dyld.h>
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#endif
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#if defined(powerpc_HOST_ARCH)
#  include <mach-o/ppc/reloc.h>
#endif
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#if defined(x86_64_HOST_ARCH)
#  include <mach-o/x86_64/reloc.h>
#endif
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#endif

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/* Hash table mapping symbol names to Symbol */
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static /*Str*/HashTable *symhash;
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/* Hash table mapping symbol names to StgStablePtr */
static /*Str*/HashTable *stablehash;

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/* List of currently loaded objects */
ObjectCode *objects = NULL;	/* initially empty */

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#if defined(OBJFORMAT_ELF)
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static int ocVerifyImage_ELF    ( ObjectCode* oc );
static int ocGetNames_ELF       ( ObjectCode* oc );
static int ocResolve_ELF        ( ObjectCode* oc );
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#if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
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static int ocAllocateSymbolExtras_ELF ( ObjectCode* oc );
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#endif
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#elif defined(OBJFORMAT_PEi386)
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static int ocVerifyImage_PEi386 ( ObjectCode* oc );
static int ocGetNames_PEi386    ( ObjectCode* oc );
static int ocResolve_PEi386     ( ObjectCode* oc );
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static void *lookupSymbolInDLLs ( unsigned char *lbl );
static void zapTrailingAtSign   ( unsigned char *sym );
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#elif defined(OBJFORMAT_MACHO)
static int ocVerifyImage_MachO    ( ObjectCode* oc );
static int ocGetNames_MachO       ( ObjectCode* oc );
static int ocResolve_MachO        ( ObjectCode* oc );
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static int machoGetMisalignment( FILE * );
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#if defined(powerpc_HOST_ARCH) || defined(x86_64_HOST_ARCH)
static int ocAllocateSymbolExtras_MachO ( ObjectCode* oc );
#endif
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#ifdef powerpc_HOST_ARCH
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static void machoInitSymbolsWithoutUnderscore( void );
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#endif
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#endif
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/* on x86_64 we have a problem with relocating symbol references in
 * code that was compiled without -fPIC.  By default, the small memory
 * model is used, which assumes that symbol references can fit in a
 * 32-bit slot.  The system dynamic linker makes this work for
 * references to shared libraries by either (a) allocating a jump
 * table slot for code references, or (b) moving the symbol at load
 * time (and copying its contents, if necessary) for data references.
 *
 * We unfortunately can't tell whether symbol references are to code
 * or data.  So for now we assume they are code (the vast majority
 * are), and allocate jump-table slots.  Unfortunately this will
 * SILENTLY generate crashing code for data references.  This hack is
 * enabled by X86_64_ELF_NONPIC_HACK.
 * 
 * One workaround is to use shared Haskell libraries.  This is
 * coming.  Another workaround is to keep the static libraries but
 * compile them with -fPIC, because that will generate PIC references
 * to data which can be relocated.  The PIC code is still too green to
 * do this systematically, though.
 *
 * See bug #781
 * See thread http://www.haskell.org/pipermail/cvs-ghc/2007-September/038458.html
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 *
 * Naming Scheme for Symbol Macros
 *
 * SymI_*: symbol is internal to the RTS. It resides in an object
 *         file/library that is statically.
 * SymE_*: symbol is external to the RTS library. It might be linked
 *         dynamically.
 *
 * Sym*_HasProto  : the symbol prototype is imported in an include file
 *                  or defined explicitly
 * Sym*_NeedsProto: the symbol is undefined and we add a dummy
 *                  default proto extern void sym(void);
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 */
#define X86_64_ELF_NONPIC_HACK 1
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/* Link objects into the lower 2Gb on x86_64.  GHC assumes the
 * small memory model on this architecture (see gcc docs,
 * -mcmodel=small).
 *
 * MAP_32BIT not available on OpenBSD/amd64
 */
#if defined(x86_64_HOST_ARCH) && defined(MAP_32BIT)
#define TRY_MAP_32BIT MAP_32BIT
#else
#define TRY_MAP_32BIT 0
#endif

/*
 * Due to the small memory model (see above), on x86_64 we have to map
 * all our non-PIC object files into the low 2Gb of the address space
 * (why 2Gb and not 4Gb?  Because all addresses must be reachable
 * using a 32-bit signed PC-relative offset). On Linux we can do this
 * using the MAP_32BIT flag to mmap(), however on other OSs
 * (e.g. *BSD, see #2063, and also on Linux inside Xen, see #2512), we
 * can't do this.  So on these systems, we have to pick a base address
 * in the low 2Gb of the address space and try to allocate memory from
 * there.
 *
 * We pick a default address based on the OS, but also make this
 * configurable via an RTS flag (+RTS -xm)
 */
#if defined(x86_64_HOST_ARCH)

#if defined(MAP_32BIT)
// Try to use MAP_32BIT
#define MMAP_32BIT_BASE_DEFAULT 0
#else
// A guess: 1Gb.
#define MMAP_32BIT_BASE_DEFAULT 0x40000000
#endif

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static void *mmap_32bit_base = (void *)MMAP_32BIT_BASE_DEFAULT;
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#endif

/* MAP_ANONYMOUS is MAP_ANON on some systems, e.g. OpenBSD */
#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
#define MAP_ANONYMOUS MAP_ANON
#endif

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/* -----------------------------------------------------------------------------
 * Built-in symbols from the RTS
 */

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typedef struct _RtsSymbolVal {
    char   *lbl;
    void   *addr;
} RtsSymbolVal;

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#define Maybe_Stable_Names      SymI_HasProto(stg_mkWeakzh)			\
      				SymI_HasProto(stg_mkWeakForeignEnvzh)		\
      				SymI_HasProto(stg_makeStableNamezh)		\
      				SymI_HasProto(stg_finalizzeWeakzh)
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#if !defined (mingw32_HOST_OS)
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#define RTS_POSIX_ONLY_SYMBOLS                  \
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      SymI_HasProto(__hscore_get_saved_termios)	\
      SymI_HasProto(__hscore_set_saved_termios)	\
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      SymI_HasProto(shutdownHaskellAndSignal)	\
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      SymI_HasProto(lockFile)                   \
      SymI_HasProto(unlockFile)                 \
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      SymI_HasProto(signal_handlers)		\
      SymI_HasProto(stg_sig_install)		\
      SymI_NeedsProto(nocldstop)
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#endif
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#if defined (cygwin32_HOST_OS)
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#define RTS_MINGW_ONLY_SYMBOLS /**/
/* Don't have the ability to read import libs / archives, so
 * we have to stupidly list a lot of what libcygwin.a
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 * exports; sigh.
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 */
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#define RTS_CYGWIN_ONLY_SYMBOLS                          \
      SymI_HasProto(regfree)                             \
      SymI_HasProto(regexec)                             \
      SymI_HasProto(regerror)                            \
      SymI_HasProto(regcomp)                             \
      SymI_HasProto(__errno)                             \
      SymI_HasProto(access)                              \
      SymI_HasProto(chmod)                               \
      SymI_HasProto(chdir)                               \
      SymI_HasProto(close)                               \
      SymI_HasProto(creat)                               \
      SymI_HasProto(dup)                                 \
      SymI_HasProto(dup2)                                \
      SymI_HasProto(fstat)                               \
      SymI_HasProto(fcntl)                               \
      SymI_HasProto(getcwd)                              \
      SymI_HasProto(getenv)                              \
      SymI_HasProto(lseek)                               \
      SymI_HasProto(open)                                \
      SymI_HasProto(fpathconf)                           \
      SymI_HasProto(pathconf)                            \
      SymI_HasProto(stat)                                \
      SymI_HasProto(pow)                                 \
      SymI_HasProto(tanh)                                \
      SymI_HasProto(cosh)                                \
      SymI_HasProto(sinh)                                \
      SymI_HasProto(atan)                                \
      SymI_HasProto(acos)                                \
      SymI_HasProto(asin)                                \
      SymI_HasProto(tan)                                 \
      SymI_HasProto(cos)                                 \
      SymI_HasProto(sin)                                 \
      SymI_HasProto(exp)                                 \
      SymI_HasProto(log)                                 \
      SymI_HasProto(sqrt)                                \
      SymI_HasProto(localtime_r)                         \
      SymI_HasProto(gmtime_r)                            \
      SymI_HasProto(mktime)                              \
      SymI_NeedsProto(_imp___tzname)                     \
      SymI_HasProto(gettimeofday)                        \
      SymI_HasProto(timezone)                            \
      SymI_HasProto(tcgetattr)                           \
      SymI_HasProto(tcsetattr)                           \
      SymI_HasProto(memcpy)                              \
      SymI_HasProto(memmove)                             \
      SymI_HasProto(realloc)                             \
      SymI_HasProto(malloc)                              \
      SymI_HasProto(free)                                \
      SymI_HasProto(fork)                                \
      SymI_HasProto(lstat)                               \
      SymI_HasProto(isatty)                              \
      SymI_HasProto(mkdir)                               \
      SymI_HasProto(opendir)                             \
      SymI_HasProto(readdir)                             \
      SymI_HasProto(rewinddir)                           \
      SymI_HasProto(closedir)                            \
      SymI_HasProto(link)                                \
      SymI_HasProto(mkfifo)                              \
      SymI_HasProto(pipe)                                \
      SymI_HasProto(read)                                \
      SymI_HasProto(rename)                              \
      SymI_HasProto(rmdir)                               \
      SymI_HasProto(select)                              \
      SymI_HasProto(system)                              \
      SymI_HasProto(write)                               \
      SymI_HasProto(strcmp)                              \
      SymI_HasProto(strcpy)                              \
      SymI_HasProto(strncpy)                             \
      SymI_HasProto(strerror)                            \
      SymI_HasProto(sigaddset)                           \
      SymI_HasProto(sigemptyset)                         \
      SymI_HasProto(sigprocmask)                         \
      SymI_HasProto(umask)                               \
      SymI_HasProto(uname)                               \
      SymI_HasProto(unlink)                              \
      SymI_HasProto(utime)                               \
      SymI_HasProto(waitpid)
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#elif !defined(mingw32_HOST_OS)
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#define RTS_MINGW_ONLY_SYMBOLS /**/
#define RTS_CYGWIN_ONLY_SYMBOLS /**/
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#else /* defined(mingw32_HOST_OS) */
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#define RTS_POSIX_ONLY_SYMBOLS  /**/
#define RTS_CYGWIN_ONLY_SYMBOLS /**/
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/* Extra syms gen'ed by mingw-2's gcc-3.2: */
#if __GNUC__>=3
#define RTS_MINGW_EXTRA_SYMS                    \
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      SymI_NeedsProto(_imp____mb_cur_max)       \
      SymI_NeedsProto(_imp___pctype)
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#else
#define RTS_MINGW_EXTRA_SYMS
#endif

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#if HAVE_GETTIMEOFDAY
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#define RTS_MINGW_GETTIMEOFDAY_SYM SymI_NeedsProto(gettimeofday)
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#else
#define RTS_MINGW_GETTIMEOFDAY_SYM /**/
#endif

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#if HAVE___MINGW_VFPRINTF
#define RTS___MINGW_VFPRINTF_SYM SymI_HasProto(__mingw_vfprintf)
#else
#define RTS___MINGW_VFPRINTF_SYM /**/
#endif

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/* These are statically linked from the mingw libraries into the ghc
   executable, so we have to employ this hack. */
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#define RTS_MINGW_ONLY_SYMBOLS                           \
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      SymI_HasProto(stg_asyncReadzh)			 \
      SymI_HasProto(stg_asyncWritezh)			 \
      SymI_HasProto(stg_asyncDoProczh)			 \
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      SymI_HasProto(memset)                              \
      SymI_HasProto(inet_ntoa)                           \
      SymI_HasProto(inet_addr)                           \
      SymI_HasProto(htonl)                               \
      SymI_HasProto(recvfrom)                            \
      SymI_HasProto(listen)                              \
      SymI_HasProto(bind)                                \
      SymI_HasProto(shutdown)                            \
      SymI_HasProto(connect)                             \
      SymI_HasProto(htons)                               \
      SymI_HasProto(ntohs)                               \
      SymI_HasProto(getservbyname)                       \
      SymI_HasProto(getservbyport)                       \
      SymI_HasProto(getprotobynumber)                    \
      SymI_HasProto(getprotobyname)                      \
      SymI_HasProto(gethostbyname)                       \
      SymI_HasProto(gethostbyaddr)                       \
      SymI_HasProto(gethostname)                         \
      SymI_HasProto(strcpy)                              \
      SymI_HasProto(strncpy)                             \
      SymI_HasProto(abort)                               \
      SymI_NeedsProto(_alloca)                           \
      SymI_NeedsProto(isxdigit)                          \
      SymI_NeedsProto(isupper)                           \
      SymI_NeedsProto(ispunct)                           \
      SymI_NeedsProto(islower)                           \
      SymI_NeedsProto(isspace)                           \
      SymI_NeedsProto(isprint)                           \
      SymI_NeedsProto(isdigit)                           \
      SymI_NeedsProto(iscntrl)                           \
      SymI_NeedsProto(isalpha)                           \
      SymI_NeedsProto(isalnum)                           \
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      SymI_NeedsProto(isascii)                           \
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      RTS___MINGW_VFPRINTF_SYM                           \
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      SymI_HasProto(strcmp)                              \
      SymI_HasProto(memmove)                             \
      SymI_HasProto(realloc)                             \
      SymI_HasProto(malloc)                              \
      SymI_HasProto(pow)                                 \
      SymI_HasProto(tanh)                                \
      SymI_HasProto(cosh)                                \
      SymI_HasProto(sinh)                                \
      SymI_HasProto(atan)                                \
      SymI_HasProto(acos)                                \
      SymI_HasProto(asin)                                \
      SymI_HasProto(tan)                                 \
      SymI_HasProto(cos)                                 \
      SymI_HasProto(sin)                                 \
      SymI_HasProto(exp)                                 \
      SymI_HasProto(log)                                 \
      SymI_HasProto(sqrt)                                \
      SymI_HasProto(powf)                                \
      SymI_HasProto(tanhf)                               \
      SymI_HasProto(coshf)                               \
      SymI_HasProto(sinhf)                               \
      SymI_HasProto(atanf)                               \
      SymI_HasProto(acosf)                               \
      SymI_HasProto(asinf)                               \
      SymI_HasProto(tanf)                                \
      SymI_HasProto(cosf)                                \
      SymI_HasProto(sinf)                                \
      SymI_HasProto(expf)                                \
      SymI_HasProto(logf)                                \
      SymI_HasProto(sqrtf)                               \
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      SymI_HasProto(erf)                                \
      SymI_HasProto(erfc)                                \
      SymI_HasProto(erff)                                \
      SymI_HasProto(erfcf)                               \
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      SymI_HasProto(memcpy)                              \
      SymI_HasProto(rts_InstallConsoleEvent)             \
      SymI_HasProto(rts_ConsoleHandlerDone)              \
      SymI_NeedsProto(mktime)                            \
      SymI_NeedsProto(_imp___timezone)                   \
      SymI_NeedsProto(_imp___tzname)                     \
      SymI_NeedsProto(_imp__tzname)                      \
      SymI_NeedsProto(_imp___iob)                        \
      SymI_NeedsProto(_imp___osver)                      \
      SymI_NeedsProto(localtime)                         \
      SymI_NeedsProto(gmtime)                            \
      SymI_NeedsProto(opendir)                           \
      SymI_NeedsProto(readdir)                           \
      SymI_NeedsProto(rewinddir)                         \
      RTS_MINGW_EXTRA_SYMS                               \
      RTS_MINGW_GETTIMEOFDAY_SYM		         \
      SymI_NeedsProto(closedir)
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#endif
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#if defined(darwin_TARGET_OS) && HAVE_PRINTF_LDBLSTUB
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#define RTS_DARWIN_ONLY_SYMBOLS			            \
     SymI_NeedsProto(asprintf$LDBLStub)                     \
     SymI_NeedsProto(err$LDBLStub)                          \
     SymI_NeedsProto(errc$LDBLStub)                         \
     SymI_NeedsProto(errx$LDBLStub)                         \
     SymI_NeedsProto(fprintf$LDBLStub)                      \
     SymI_NeedsProto(fscanf$LDBLStub)                       \
     SymI_NeedsProto(fwprintf$LDBLStub)                     \
     SymI_NeedsProto(fwscanf$LDBLStub)                      \
     SymI_NeedsProto(printf$LDBLStub)                       \
     SymI_NeedsProto(scanf$LDBLStub)                        \
     SymI_NeedsProto(snprintf$LDBLStub)                     \
     SymI_NeedsProto(sprintf$LDBLStub)                      \
     SymI_NeedsProto(sscanf$LDBLStub)                       \
     SymI_NeedsProto(strtold$LDBLStub)                      \
     SymI_NeedsProto(swprintf$LDBLStub)                     \
     SymI_NeedsProto(swscanf$LDBLStub)                      \
     SymI_NeedsProto(syslog$LDBLStub)                       \
     SymI_NeedsProto(vasprintf$LDBLStub)                    \
     SymI_NeedsProto(verr$LDBLStub)                         \
     SymI_NeedsProto(verrc$LDBLStub)                        \
     SymI_NeedsProto(verrx$LDBLStub)                        \
     SymI_NeedsProto(vfprintf$LDBLStub)                     \
     SymI_NeedsProto(vfscanf$LDBLStub)                      \
     SymI_NeedsProto(vfwprintf$LDBLStub)                    \
     SymI_NeedsProto(vfwscanf$LDBLStub)                     \
     SymI_NeedsProto(vprintf$LDBLStub)                      \
     SymI_NeedsProto(vscanf$LDBLStub)                       \
     SymI_NeedsProto(vsnprintf$LDBLStub)                    \
     SymI_NeedsProto(vsprintf$LDBLStub)                     \
     SymI_NeedsProto(vsscanf$LDBLStub)                      \
     SymI_NeedsProto(vswprintf$LDBLStub)                    \
     SymI_NeedsProto(vswscanf$LDBLStub)                     \
     SymI_NeedsProto(vsyslog$LDBLStub)                      \
     SymI_NeedsProto(vwarn$LDBLStub)                        \
     SymI_NeedsProto(vwarnc$LDBLStub)                       \
     SymI_NeedsProto(vwarnx$LDBLStub)                       \
     SymI_NeedsProto(vwprintf$LDBLStub)                     \
     SymI_NeedsProto(vwscanf$LDBLStub)                      \
     SymI_NeedsProto(warn$LDBLStub)                         \
     SymI_NeedsProto(warnc$LDBLStub)                        \
     SymI_NeedsProto(warnx$LDBLStub)                        \
     SymI_NeedsProto(wcstold$LDBLStub)                      \
     SymI_NeedsProto(wprintf$LDBLStub)                      \
     SymI_NeedsProto(wscanf$LDBLStub)
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#else
#define RTS_DARWIN_ONLY_SYMBOLS
#endif

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#ifndef SMP
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# define MAIN_CAP_SYM SymI_HasProto(MainCapability)
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#else
# define MAIN_CAP_SYM
#endif
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#if !defined(mingw32_HOST_OS)
#define RTS_USER_SIGNALS_SYMBOLS \
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   SymI_HasProto(setIOManagerPipe) \
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   SymI_HasProto(ioManagerWakeup) \
   SymI_HasProto(ioManagerSync) \
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   SymI_HasProto(blockUserSignals) \
   SymI_HasProto(unblockUserSignals)
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#else
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#define RTS_USER_SIGNALS_SYMBOLS     \
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   SymI_HasProto(ioManagerWakeup) \
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   SymI_HasProto(sendIOManagerEvent) \
   SymI_HasProto(readIOManagerEvent) \
   SymI_HasProto(getIOManagerEvent)  \
   SymI_HasProto(console_handler)
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#endif

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#define RTS_LIBFFI_SYMBOLS                                  \
     SymE_NeedsProto(ffi_prep_cif)                          \
     SymE_NeedsProto(ffi_call)                              \
     SymE_NeedsProto(ffi_type_void)                         \
     SymE_NeedsProto(ffi_type_float)                        \
     SymE_NeedsProto(ffi_type_double)                       \
     SymE_NeedsProto(ffi_type_sint64)                       \
     SymE_NeedsProto(ffi_type_uint64)                       \
     SymE_NeedsProto(ffi_type_sint32)                       \
     SymE_NeedsProto(ffi_type_uint32)                       \
     SymE_NeedsProto(ffi_type_sint16)                       \
     SymE_NeedsProto(ffi_type_uint16)                       \
     SymE_NeedsProto(ffi_type_sint8)                        \
     SymE_NeedsProto(ffi_type_uint8)                        \
     SymE_NeedsProto(ffi_type_pointer)
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#ifdef TABLES_NEXT_TO_CODE
#define RTS_RET_SYMBOLS /* nothing */
#else
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#define RTS_RET_SYMBOLS 		                \
      SymI_HasProto(stg_enter_ret)			\
      SymI_HasProto(stg_gc_fun_ret)			\
      SymI_HasProto(stg_ap_v_ret)			\
      SymI_HasProto(stg_ap_f_ret)			\
      SymI_HasProto(stg_ap_d_ret)			\
      SymI_HasProto(stg_ap_l_ret)			\
      SymI_HasProto(stg_ap_n_ret)			\
      SymI_HasProto(stg_ap_p_ret)			\
      SymI_HasProto(stg_ap_pv_ret)			\
      SymI_HasProto(stg_ap_pp_ret)			\
      SymI_HasProto(stg_ap_ppv_ret)			\
      SymI_HasProto(stg_ap_ppp_ret)			\
      SymI_HasProto(stg_ap_pppv_ret)			\
      SymI_HasProto(stg_ap_pppp_ret)			\
      SymI_HasProto(stg_ap_ppppp_ret)			\
      SymI_HasProto(stg_ap_pppppp_ret)
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#endif

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/* Modules compiled with -ticky may mention ticky counters */
/* This list should marry up with the one in $(TOP)/includes/stg/Ticky.h */
#define RTS_TICKY_SYMBOLS                       \
      SymI_NeedsProto(ticky_entry_ctrs)         \
      SymI_NeedsProto(top_ct)                   \
                                                \
      SymI_HasProto(ENT_VIA_NODE_ctr)		\
      SymI_HasProto(ENT_STATIC_THK_ctr)		\
      SymI_HasProto(ENT_DYN_THK_ctr)		\
      SymI_HasProto(ENT_STATIC_FUN_DIRECT_ctr)	\
      SymI_HasProto(ENT_DYN_FUN_DIRECT_ctr)	\
      SymI_HasProto(ENT_STATIC_CON_ctr)		\
      SymI_HasProto(ENT_DYN_CON_ctr)		\
      SymI_HasProto(ENT_STATIC_IND_ctr)		\
      SymI_HasProto(ENT_DYN_IND_ctr)		\
      SymI_HasProto(ENT_PERM_IND_ctr)		\
      SymI_HasProto(ENT_PAP_ctr)		\
      SymI_HasProto(ENT_AP_ctr)		        \
      SymI_HasProto(ENT_AP_STACK_ctr)		\
      SymI_HasProto(ENT_BH_ctr)	        	\
      SymI_HasProto(UNKNOWN_CALL_ctr)		\
      SymI_HasProto(SLOW_CALL_v_ctr)		\
      SymI_HasProto(SLOW_CALL_f_ctr)		\
      SymI_HasProto(SLOW_CALL_d_ctr)		\
      SymI_HasProto(SLOW_CALL_l_ctr)		\
      SymI_HasProto(SLOW_CALL_n_ctr)		\
      SymI_HasProto(SLOW_CALL_p_ctr)		\
      SymI_HasProto(SLOW_CALL_pv_ctr)		\
      SymI_HasProto(SLOW_CALL_pp_ctr)		\
      SymI_HasProto(SLOW_CALL_ppv_ctr)		\
      SymI_HasProto(SLOW_CALL_ppp_ctr)		\
      SymI_HasProto(SLOW_CALL_pppv_ctr)		\
      SymI_HasProto(SLOW_CALL_pppp_ctr)		\
      SymI_HasProto(SLOW_CALL_ppppp_ctr)		\
      SymI_HasProto(SLOW_CALL_pppppp_ctr)		\
      SymI_HasProto(SLOW_CALL_OTHER_ctr)		\
      SymI_HasProto(ticky_slow_call_unevald)            \
      SymI_HasProto(SLOW_CALL_ctr)		        \
      SymI_HasProto(MULTI_CHUNK_SLOW_CALL_ctr)		\
      SymI_HasProto(MULTI_CHUNK_SLOW_CALL_CHUNKS_ctr)	\
      SymI_HasProto(KNOWN_CALL_ctr)		        \
      SymI_HasProto(KNOWN_CALL_TOO_FEW_ARGS_ctr)	\
      SymI_HasProto(KNOWN_CALL_EXTRA_ARGS_ctr)		\
      SymI_HasProto(SLOW_CALL_FUN_TOO_FEW_ctr)		\
      SymI_HasProto(SLOW_CALL_FUN_CORRECT_ctr)		\
      SymI_HasProto(SLOW_CALL_FUN_TOO_MANY_ctr)		\
      SymI_HasProto(SLOW_CALL_PAP_TOO_FEW_ctr)		\
      SymI_HasProto(SLOW_CALL_PAP_CORRECT_ctr)		\
      SymI_HasProto(SLOW_CALL_PAP_TOO_MANY_ctr)		\
      SymI_HasProto(SLOW_CALL_UNEVALD_ctr)		\
      SymI_HasProto(UPDF_OMITTED_ctr)		\
      SymI_HasProto(UPDF_PUSHED_ctr)		\
      SymI_HasProto(CATCHF_PUSHED_ctr)		\
      SymI_HasProto(UPDF_RCC_PUSHED_ctr)	\
      SymI_HasProto(UPDF_RCC_OMITTED_ctr)	\
      SymI_HasProto(UPD_SQUEEZED_ctr)		\
      SymI_HasProto(UPD_CON_IN_NEW_ctr)		\
      SymI_HasProto(UPD_CON_IN_PLACE_ctr)	\
      SymI_HasProto(UPD_PAP_IN_NEW_ctr)		\
      SymI_HasProto(UPD_PAP_IN_PLACE_ctr)	\
      SymI_HasProto(ALLOC_HEAP_ctr)		\
      SymI_HasProto(ALLOC_HEAP_tot)             \
      SymI_HasProto(ALLOC_FUN_ctr)		\
      SymI_HasProto(ALLOC_FUN_adm)              \
      SymI_HasProto(ALLOC_FUN_gds)              \
      SymI_HasProto(ALLOC_FUN_slp)              \
      SymI_HasProto(UPD_NEW_IND_ctr)		\
      SymI_HasProto(UPD_NEW_PERM_IND_ctr)	\
      SymI_HasProto(UPD_OLD_IND_ctr)		\
      SymI_HasProto(UPD_OLD_PERM_IND_ctr)		\
      SymI_HasProto(UPD_BH_UPDATABLE_ctr)		\
      SymI_HasProto(UPD_BH_SINGLE_ENTRY_ctr)		\
      SymI_HasProto(UPD_CAF_BH_UPDATABLE_ctr)		\
      SymI_HasProto(UPD_CAF_BH_SINGLE_ENTRY_ctr)	\
      SymI_HasProto(GC_SEL_ABANDONED_ctr)		\
      SymI_HasProto(GC_SEL_MINOR_ctr)		\
      SymI_HasProto(GC_SEL_MAJOR_ctr)		\
      SymI_HasProto(GC_FAILED_PROMOTION_ctr)	\
      SymI_HasProto(ALLOC_UP_THK_ctr)		\
      SymI_HasProto(ALLOC_SE_THK_ctr)		\
      SymI_HasProto(ALLOC_THK_adm)		\
      SymI_HasProto(ALLOC_THK_gds)		\
      SymI_HasProto(ALLOC_THK_slp)		\
      SymI_HasProto(ALLOC_CON_ctr)		\
      SymI_HasProto(ALLOC_CON_adm)		\
      SymI_HasProto(ALLOC_CON_gds)		\
      SymI_HasProto(ALLOC_CON_slp)		\
      SymI_HasProto(ALLOC_TUP_ctr)		\
      SymI_HasProto(ALLOC_TUP_adm)		\
      SymI_HasProto(ALLOC_TUP_gds)		\
      SymI_HasProto(ALLOC_TUP_slp)		\
      SymI_HasProto(ALLOC_BH_ctr)		\
      SymI_HasProto(ALLOC_BH_adm)		\
      SymI_HasProto(ALLOC_BH_gds)		\
      SymI_HasProto(ALLOC_BH_slp)		\
      SymI_HasProto(ALLOC_PRIM_ctr)		\
      SymI_HasProto(ALLOC_PRIM_adm)		\
      SymI_HasProto(ALLOC_PRIM_gds)		\
      SymI_HasProto(ALLOC_PRIM_slp)		\
      SymI_HasProto(ALLOC_PAP_ctr)		\
      SymI_HasProto(ALLOC_PAP_adm)		\
      SymI_HasProto(ALLOC_PAP_gds)		\
      SymI_HasProto(ALLOC_PAP_slp)		\
      SymI_HasProto(ALLOC_TSO_ctr)		\
      SymI_HasProto(ALLOC_TSO_adm)		\
      SymI_HasProto(ALLOC_TSO_gds)		\
      SymI_HasProto(ALLOC_TSO_slp)		\
      SymI_HasProto(RET_NEW_ctr)		\
      SymI_HasProto(RET_OLD_ctr)		\
      SymI_HasProto(RET_UNBOXED_TUP_ctr)	\
      SymI_HasProto(RET_SEMI_loads_avoided)


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// On most platforms, the garbage collector rewrites references
//	to small integer and char objects to a set of common, shared ones.
//
// We don't do this when compiling to Windows DLLs at the moment because
//	it doesn't support cross package data references well.
//
#if defined(__PIC__) && defined(mingw32_HOST_OS)
#define RTS_INTCHAR_SYMBOLS
#else
#define RTS_INTCHAR_SYMBOLS				\
      SymI_HasProto(stg_CHARLIKE_closure)		\
      SymI_HasProto(stg_INTLIKE_closure)		
#endif


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#define RTS_SYMBOLS				        \
      Maybe_Stable_Names			        \
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      RTS_TICKY_SYMBOLS                                 \
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      SymI_HasProto(StgReturn)				\
      SymI_HasProto(stg_enter_info)			\
      SymI_HasProto(stg_gc_void_info)			\
      SymI_HasProto(__stg_gc_enter_1)			\
      SymI_HasProto(stg_gc_noregs)			\
      SymI_HasProto(stg_gc_unpt_r1_info)		\
      SymI_HasProto(stg_gc_unpt_r1)			\
      SymI_HasProto(stg_gc_unbx_r1_info)		\
      SymI_HasProto(stg_gc_unbx_r1)			\
      SymI_HasProto(stg_gc_f1_info)			\
      SymI_HasProto(stg_gc_f1)				\
      SymI_HasProto(stg_gc_d1_info)			\
      SymI_HasProto(stg_gc_d1)				\
      SymI_HasProto(stg_gc_l1_info)			\
      SymI_HasProto(stg_gc_l1)				\
      SymI_HasProto(__stg_gc_fun)			\
      SymI_HasProto(stg_gc_fun_info)			\
      SymI_HasProto(stg_gc_gen)				\
      SymI_HasProto(stg_gc_gen_info)			\
      SymI_HasProto(stg_gc_gen_hp)			\
      SymI_HasProto(stg_gc_ut)				\
      SymI_HasProto(stg_gen_yield)			\
      SymI_HasProto(stg_yield_noregs)			\
      SymI_HasProto(stg_yield_to_interpreter)		\
      SymI_HasProto(stg_gen_block)			\
      SymI_HasProto(stg_block_noregs)			\
      SymI_HasProto(stg_block_1)			\
      SymI_HasProto(stg_block_takemvar)			\
      SymI_HasProto(stg_block_putmvar)			\
      MAIN_CAP_SYM                                      \
      SymI_HasProto(MallocFailHook)			\
      SymI_HasProto(OnExitHook)				\
      SymI_HasProto(OutOfHeapHook)			\
      SymI_HasProto(StackOverflowHook)			\
      SymI_HasProto(addDLL)               		\
      SymI_HasProto(__int_encodeDouble)			\
      SymI_HasProto(__word_encodeDouble)		\
      SymI_HasProto(__2Int_encodeDouble)		\
      SymI_HasProto(__int_encodeFloat)			\
      SymI_HasProto(__word_encodeFloat)			\
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      SymI_HasProto(stg_atomicallyzh)			\
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      SymI_HasProto(barf)				\
      SymI_HasProto(debugBelch)				\
      SymI_HasProto(errorBelch)				\
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      SymI_HasProto(sysErrorBelch)                      \
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      SymI_HasProto(stg_asyncExceptionsBlockedzh)	\
      SymI_HasProto(stg_blockAsyncExceptionszh)	        \
      SymI_HasProto(stg_catchzh)			\
      SymI_HasProto(stg_catchRetryzh)			\
      SymI_HasProto(stg_catchSTMzh)			\
      SymI_HasProto(stg_checkzh)                        \
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      SymI_HasProto(closure_flags)                      \
      SymI_HasProto(cmp_thread)				\
      SymI_HasProto(createAdjustor)			\
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      SymI_HasProto(stg_decodeDoublezu2Intzh)		\
      SymI_HasProto(stg_decodeFloatzuIntzh)		\
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      SymI_HasProto(defaultsHook)			\
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      SymI_HasProto(stg_delayzh)			\
      SymI_HasProto(stg_deRefWeakzh)			\
      SymI_HasProto(stg_deRefStablePtrzh)		\
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      SymI_HasProto(dirty_MUT_VAR)			\
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      SymI_HasProto(stg_forkzh)			        \
      SymI_HasProto(stg_forkOnzh)			\
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      SymI_HasProto(forkProcess)			\
      SymI_HasProto(forkOS_createThread)		\
      SymI_HasProto(freeHaskellFunctionPtr)		\
      SymI_HasProto(getOrSetTypeableStore)		\
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      SymI_HasProto(getOrSetGHCConcSignalHandlerStore)		\
      SymI_HasProto(getOrSetGHCConcPendingEventsStore)		\
      SymI_HasProto(getOrSetGHCConcPendingDelaysStore)		\
      SymI_HasProto(getOrSetGHCConcIOManagerThreadStore)	\
      SymI_HasProto(getOrSetGHCConcProddingStore)		\
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      SymI_HasProto(genSymZh)				\
      SymI_HasProto(genericRaise)			\
      SymI_HasProto(getProgArgv)			\
      SymI_HasProto(getFullProgArgv)			\
      SymI_HasProto(getStablePtr)			\
      SymI_HasProto(hs_init)				\
      SymI_HasProto(hs_exit)				\
      SymI_HasProto(hs_set_argv)			\
      SymI_HasProto(hs_add_root)			\
      SymI_HasProto(hs_perform_gc)			\
      SymI_HasProto(hs_free_stable_ptr)			\
      SymI_HasProto(hs_free_fun_ptr)			\
      SymI_HasProto(hs_hpc_rootModule)		        \
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      SymI_HasProto(hs_hpc_module)		        \
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      SymI_HasProto(initLinker)				\
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      SymI_HasProto(stg_unpackClosurezh)                \
      SymI_HasProto(stg_getApStackValzh)                \
      SymI_HasProto(stg_getSparkzh)                     \
      SymI_HasProto(stg_isCurrentThreadBoundzh)	        \
      SymI_HasProto(stg_isEmptyMVarzh)			\
      SymI_HasProto(stg_killThreadzh)			\
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      SymI_HasProto(loadObj)          			\
      SymI_HasProto(insertStableSymbol) 		\
      SymI_HasProto(insertSymbol)     			\
      SymI_HasProto(lookupSymbol)     			\
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      SymI_HasProto(stg_makeStablePtrzh)		\
      SymI_HasProto(stg_mkApUpd0zh)			\
      SymI_HasProto(stg_myThreadIdzh)			\
      SymI_HasProto(stg_labelThreadzh)                  \
      SymI_HasProto(stg_newArrayzh)			\
      SymI_HasProto(stg_newBCOzh)			\
      SymI_HasProto(stg_newByteArrayzh)  		\
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      SymI_HasProto_redirect(newCAF, newDynCAF)		\
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      SymI_HasProto(stg_newMVarzh)			\
      SymI_HasProto(stg_newMutVarzh)			\
      SymI_HasProto(stg_newTVarzh)			\
      SymI_HasProto(stg_noDuplicatezh)			\
      SymI_HasProto(stg_atomicModifyMutVarzh)		\
      SymI_HasProto(stg_newPinnedByteArrayzh)		\
      SymI_HasProto(stg_newAlignedPinnedByteArrayzh)	\
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      SymI_HasProto(newSpark)				\
      SymI_HasProto(performGC)				\
      SymI_HasProto(performMajorGC)			\
      SymI_HasProto(prog_argc)				\
      SymI_HasProto(prog_argv)				\
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      SymI_HasProto(stg_putMVarzh)			\
      SymI_HasProto(stg_raisezh)			\
      SymI_HasProto(stg_raiseIOzh)			\
      SymI_HasProto(stg_readTVarzh)			\
      SymI_HasProto(stg_readTVarIOzh)			\
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      SymI_HasProto(resumeThread)			\
      SymI_HasProto(resolveObjs)                        \
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      SymI_HasProto(stg_retryzh)                        \
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      SymI_HasProto(rts_apply)				\
      SymI_HasProto(rts_checkSchedStatus)		\
      SymI_HasProto(rts_eval)				\
      SymI_HasProto(rts_evalIO)				\
      SymI_HasProto(rts_evalLazyIO)			\
      SymI_HasProto(rts_evalStableIO)			\
      SymI_HasProto(rts_eval_)				\
      SymI_HasProto(rts_getBool)			\
      SymI_HasProto(rts_getChar)			\
      SymI_HasProto(rts_getDouble)			\
      SymI_HasProto(rts_getFloat)			\
      SymI_HasProto(rts_getInt)				\
      SymI_HasProto(rts_getInt8)			\
      SymI_HasProto(rts_getInt16)			\
      SymI_HasProto(rts_getInt32)			\
      SymI_HasProto(rts_getInt64)			\
      SymI_HasProto(rts_getPtr)				\
      SymI_HasProto(rts_getFunPtr)			\
      SymI_HasProto(rts_getStablePtr)			\
      SymI_HasProto(rts_getThreadId)			\
      SymI_HasProto(rts_getWord)			\
      SymI_HasProto(rts_getWord8)			\
      SymI_HasProto(rts_getWord16)			\
      SymI_HasProto(rts_getWord32)			\
      SymI_HasProto(rts_getWord64)			\
      SymI_HasProto(rts_lock)				\
      SymI_HasProto(rts_mkBool)				\
      SymI_HasProto(rts_mkChar)				\
      SymI_HasProto(rts_mkDouble)			\
      SymI_HasProto(rts_mkFloat)			\
      SymI_HasProto(rts_mkInt)				\
      SymI_HasProto(rts_mkInt8)				\
      SymI_HasProto(rts_mkInt16)			\
      SymI_HasProto(rts_mkInt32)			\
      SymI_HasProto(rts_mkInt64)			\
      SymI_HasProto(rts_mkPtr)				\
      SymI_HasProto(rts_mkFunPtr)			\
      SymI_HasProto(rts_mkStablePtr)			\
      SymI_HasProto(rts_mkString)			\
      SymI_HasProto(rts_mkWord)				\
      SymI_HasProto(rts_mkWord8)			\
      SymI_HasProto(rts_mkWord16)			\
      SymI_HasProto(rts_mkWord32)			\
      SymI_HasProto(rts_mkWord64)			\
      SymI_HasProto(rts_unlock)				\
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      SymI_HasProto(rts_unsafeGetMyCapability)          \
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      SymI_HasProto(rtsSupportsBoundThreads)		\
      SymI_HasProto(setProgArgv)			\
      SymI_HasProto(startupHaskell)			\
      SymI_HasProto(shutdownHaskell)			\
      SymI_HasProto(shutdownHaskellAndExit)		\
      SymI_HasProto(stable_ptr_table)			\
      SymI_HasProto(stackOverflow)			\
      SymI_HasProto(stg_CAF_BLACKHOLE_info)		\
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      SymI_HasProto(__stg_EAGER_BLACKHOLE_info)		\
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      SymI_HasProto(startTimer)                         \
      SymI_HasProto(stg_MVAR_CLEAN_info)		\
      SymI_HasProto(stg_MVAR_DIRTY_info)		\
      SymI_HasProto(stg_IND_STATIC_info)		\
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      SymI_HasProto(stg_ARR_WORDS_info)                 \
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      SymI_HasProto(stg_MUT_ARR_PTRS_DIRTY_info)	\
      SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN_info)	\
      SymI_HasProto(stg_MUT_ARR_PTRS_FROZEN0_info)	\
      SymI_HasProto(stg_WEAK_info)                      \
      SymI_HasProto(stg_ap_v_info)			\
      SymI_HasProto(stg_ap_f_info)			\
      SymI_HasProto(stg_ap_d_info)			\
      SymI_HasProto(stg_ap_l_info)			\
      SymI_HasProto(stg_ap_n_info)			\
      SymI_HasProto(stg_ap_p_info)			\
      SymI_HasProto(stg_ap_pv_info)			\
      SymI_HasProto(stg_ap_pp_info)			\
      SymI_HasProto(stg_ap_ppv_info)			\
      SymI_HasProto(stg_ap_ppp_info)			\
      SymI_HasProto(stg_ap_pppv_info)			\
      SymI_HasProto(stg_ap_pppp_info)			\
      SymI_HasProto(stg_ap_ppppp_info)			\
      SymI_HasProto(stg_ap_pppppp_info)			\
      SymI_HasProto(stg_ap_0_fast)			\
      SymI_HasProto(stg_ap_v_fast)			\
      SymI_HasProto(stg_ap_f_fast)			\
      SymI_HasProto(stg_ap_d_fast)			\
      SymI_HasProto(stg_ap_l_fast)			\
      SymI_HasProto(stg_ap_n_fast)			\
      SymI_HasProto(stg_ap_p_fast)			\
      SymI_HasProto(stg_ap_pv_fast)			\
      SymI_HasProto(stg_ap_pp_fast)			\
      SymI_HasProto(stg_ap_ppv_fast)			\
      SymI_HasProto(stg_ap_ppp_fast)			\
      SymI_HasProto(stg_ap_pppv_fast)			\
      SymI_HasProto(stg_ap_pppp_fast)			\
      SymI_HasProto(stg_ap_ppppp_fast)			\
      SymI_HasProto(stg_ap_pppppp_fast)			\
      SymI_HasProto(stg_ap_1_upd_info)			\
      SymI_HasProto(stg_ap_2_upd_info)			\
      SymI_HasProto(stg_ap_3_upd_info)			\
      SymI_HasProto(stg_ap_4_upd_info)			\
      SymI_HasProto(stg_ap_5_upd_info)			\
      SymI_HasProto(stg_ap_6_upd_info)			\
      SymI_HasProto(stg_ap_7_upd_info)			\
      SymI_HasProto(stg_exit)				\
      SymI_HasProto(stg_sel_0_upd_info)			\
      SymI_HasProto(stg_sel_10_upd_info)		\
      SymI_HasProto(stg_sel_11_upd_info)		\
      SymI_HasProto(stg_sel_12_upd_info)		\
      SymI_HasProto(stg_sel_13_upd_info)		\
      SymI_HasProto(stg_sel_14_upd_info)		\
      SymI_HasProto(stg_sel_15_upd_info)		\
      SymI_HasProto(stg_sel_1_upd_info)			\
      SymI_HasProto(stg_sel_2_upd_info)			\
      SymI_HasProto(stg_sel_3_upd_info)			\
      SymI_HasProto(stg_sel_4_upd_info)			\
      SymI_HasProto(stg_sel_5_upd_info)			\
      SymI_HasProto(stg_sel_6_upd_info)			\
      SymI_HasProto(stg_sel_7_upd_info)			\
      SymI_HasProto(stg_sel_8_upd_info)			\
      SymI_HasProto(stg_sel_9_upd_info)			\
      SymI_HasProto(stg_upd_frame_info)			\
      SymI_HasProto(suspendThread)			\
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      SymI_HasProto(stg_takeMVarzh)			\
      SymI_HasProto(stg_threadStatuszh)		        \
      SymI_HasProto(stg_tryPutMVarzh)			\
      SymI_HasProto(stg_tryTakeMVarzh)			\
      SymI_HasProto(stg_unblockAsyncExceptionszh)	\
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      SymI_HasProto(unloadObj)                          \
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      SymI_HasProto(stg_unsafeThawArrayzh)		\
      SymI_HasProto(stg_waitReadzh)			\
      SymI_HasProto(stg_waitWritezh)			\
      SymI_HasProto(stg_writeTVarzh)			\
      SymI_HasProto(stg_yieldzh)                        \
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      SymI_NeedsProto(stg_interp_constr_entry)          \
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      SymI_HasProto(alloc_blocks_lim)                   \
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      SymI_HasProto(g0)                                 \
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      SymI_HasProto(allocate)                           \
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      SymI_HasProto(allocateExec)	                \
      SymI_HasProto(freeExec)		                \
      SymI_HasProto(getAllocations)                     \
      SymI_HasProto(revertCAFs)                         \
      SymI_HasProto(RtsFlags)                           \
      SymI_NeedsProto(rts_breakpoint_io_action)		\
      SymI_NeedsProto(rts_stop_next_breakpoint)		\
      SymI_NeedsProto(rts_stop_on_exception)		\
      SymI_HasProto(stopTimer)				\
      SymI_HasProto(n_capabilities)			\
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      SymI_HasProto(stg_traceCcszh)                     \
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      SymI_HasProto(stg_traceEventzh)                   \
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      RTS_USER_SIGNALS_SYMBOLS				\
      RTS_INTCHAR_SYMBOLS
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// 64-bit support functions in libgcc.a
#if defined(__GNUC__) && SIZEOF_VOID_P <= 4
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#define RTS_LIBGCC_SYMBOLS			       \
      SymI_NeedsProto(__divdi3)                        \
      SymI_NeedsProto(__udivdi3)                       \
      SymI_NeedsProto(__moddi3)                        \
      SymI_NeedsProto(__umoddi3)		       \
      SymI_NeedsProto(__muldi3)			       \
      SymI_NeedsProto(__ashldi3)		       \
      SymI_NeedsProto(__ashrdi3)		       \
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      SymI_NeedsProto(__lshrdi3)
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#else
#define RTS_LIBGCC_SYMBOLS
#endif

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#if defined(darwin_HOST_OS) && defined(powerpc_HOST_ARCH)
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      // Symbols that don't have a leading underscore
      // on Mac OS X. They have to receive special treatment,
      // see machoInitSymbolsWithoutUnderscore()
#define RTS_MACHO_NOUNDERLINE_SYMBOLS		\
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      SymI_NeedsProto(saveFP)				\
      SymI_NeedsProto(restFP)
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#endif
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/* entirely bogus claims about types of these symbols */
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#define SymI_NeedsProto(vvv)  extern void vvv(void);
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#if defined(__PIC__) && defined(mingw32_TARGET_OS)
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#define SymE_HasProto(vvv)    SymE_HasProto(vvv);
#define SymE_NeedsProto(vvv)    extern void _imp__ ## vvv (void);
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#else
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#define SymE_NeedsProto(vvv)  SymI_NeedsProto(vvv);
#define SymE_HasProto(vvv)    SymI_HasProto(vvv)
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#endif
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#define SymI_HasProto(vvv) /**/
#define SymI_HasProto_redirect(vvv,xxx) /**/
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RTS_SYMBOLS
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RTS_RET_SYMBOLS
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RTS_POSIX_ONLY_SYMBOLS
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RTS_MINGW_ONLY_SYMBOLS
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RTS_CYGWIN_ONLY_SYMBOLS
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RTS_DARWIN_ONLY_SYMBOLS
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RTS_LIBGCC_SYMBOLS
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RTS_LIBFFI_SYMBOLS
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#undef SymI_NeedsProto
#undef SymI_HasProto
#undef SymI_HasProto_redirect
#undef SymE_HasProto
#undef SymE_NeedsProto
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#ifdef LEADING_UNDERSCORE
#define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
#else
#define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
#endif

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#define SymI_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
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                    (void*)(&(vvv)) },
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#define SymE_HasProto(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
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	    (void*)DLL_IMPORT_DATA_REF(vvv) },
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#define SymI_NeedsProto(vvv) SymI_HasProto(vvv)
#define SymE_NeedsProto(vvv) SymE_HasProto(vvv)

// SymI_HasProto_redirect allows us to redirect references to one symbol to
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// another symbol.  See newCAF/newDynCAF for an example.
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#define SymI_HasProto_redirect(vvv,xxx) \
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    { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
      (void*)(&(xxx)) },

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static RtsSymbolVal rtsSyms[] = {
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      RTS_SYMBOLS
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      RTS_RET_SYMBOLS
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      RTS_POSIX_ONLY_SYMBOLS
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      RTS_MINGW_ONLY_SYMBOLS
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      RTS_CYGWIN_ONLY_SYMBOLS
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      RTS_DARWIN_ONLY_SYMBOLS
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      RTS_LIBGCC_SYMBOLS
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      RTS_LIBFFI_SYMBOLS
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#if defined(darwin_HOST_OS) && defined(i386_HOST_ARCH)
      // dyld stub code contains references to this,
      // but it should never be called because we treat
      // lazy pointers as nonlazy.
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      { "dyld_stub_binding_helper", (void*)0xDEADBEEF },
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#endif
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      { 0, 0 } /* sentinel */
};

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/* -----------------------------------------------------------------------------
 * Insert symbols into hash tables, checking for duplicates.
 */
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static void ghciInsertStrHashTable ( char* obj_name,
                                     HashTable *table,
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                                     char* key,
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                                     void *data
				   )
{
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   if (lookupHashTable(table, (StgWord)key) == NULL)
   {
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      insertStrHashTable(table, (StgWord)key, data);
      return;
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   }
   debugBelch(
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      "\n\n"
      "GHCi runtime linker: fatal error: I found a duplicate definition for symbol\n"
      "   %s\n"
      "whilst processing object file\n"
      "   %s\n"
      "This could be caused by:\n"
      "   * Loading two different object files which export the same symbol\n"
      "   * Specifying the same object file twice on the GHCi command line\n"
      "   * An incorrect `package.conf' entry, causing some object to be\n"
      "     loaded twice.\n"
      "GHCi cannot safely continue in this situation.  Exiting now.  Sorry.\n"
      "\n",
      (char*)key,
      obj_name
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   );
   exit(1);
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}
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/* -----------------------------------------------------------------------------
 * initialize the object linker
 */
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static int linker_init_done = 0 ;

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#if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
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static void *dl_prog_handle;
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static regex_t re_invalid;
static regex_t re_realso;
#ifdef THREADED_RTS
static Mutex dl_mutex; // mutex to protect dlopen/dlerror critical section
#endif
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#endif
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void
initLinker( void )
{
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    RtsSymbolVal *sym;
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    int compileResult;
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    /* Make initLinker idempotent, so we can call it
       before evey relevant operation; that means we
       don't need to initialise the linker separately */
    if (linker_init_done == 1) { return; } else {
      linker_init_done = 1;
    }

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#ifdef THREADED_RTS
    initMutex(&dl_mutex);
#endif
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    stablehash = allocStrHashTable();
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    symhash = allocStrHashTable();

    /* populate the symbol table with stuff from the RTS */
    for (sym = rtsSyms; sym->lbl != NULL; sym++) {
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	ghciInsertStrHashTable("(GHCi built-in symbols)",
                               symhash, sym->lbl, sym->addr);
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    }
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#   if defined(OBJFORMAT_MACHO) && defined(powerpc_HOST_ARCH)
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    machoInitSymbolsWithoutUnderscore();
#   endif

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#   if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
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#   if defined(RTLD_DEFAULT)
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    dl_prog_handle = RTLD_DEFAULT;
#   else
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    dl_prog_handle = dlopen(NULL, RTLD_LAZY);
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#   endif /* RTLD_DEFAULT */
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    compileResult = regcomp(&re_invalid,
           "(([^ \t()])+\\.so([^ \t:()])*):([ \t])*invalid ELF header",
           REG_EXTENDED);
    ASSERT( compileResult == 0 );
    compileResult = regcomp(&re_realso,
           "GROUP *\\( *(([^ )])+)",
           REG_EXTENDED);
    ASSERT( compileResult == 0 );
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#   endif
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#if defined(x86_64_HOST_ARCH)
    if (RtsFlags.MiscFlags.linkerMemBase != 0) {
        // User-override for mmap_32bit_base
        mmap_32bit_base = (void*)RtsFlags.MiscFlags.linkerMemBase;
    }
#endif
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#if defined(mingw32_HOST_OS)
    /*
     * These two libraries cause problems when added to the static link,
     * but are necessary for resolving symbols in GHCi, hence we load
     * them manually here.
     */
    addDLL("msvcrt");
    addDLL("kernel32");
#endif
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}

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void
exitLinker( void ) {
#if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
   if (linker_init_done == 1) {
      regfree(&re_invalid);
      regfree(&re_realso);
#ifdef THREADED_RTS
      closeMutex(&dl_mutex);
#endif
   }
#endif
}

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/* -----------------------------------------------------------------------------
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 *                  Loading DLL or .so dynamic libraries
 * -----------------------------------------------------------------------------
 *
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 * Add a DLL from which symbols may be found.  In the ELF case, just
 * do RTLD_GLOBAL-style add, so no further messing around needs to
 * happen in order that symbols in the loaded .so are findable --
 * lookupSymbol() will subsequently see them by dlsym on the program's
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 * dl-handle.  Returns NULL if success, otherwise ptr to an err msg.
 *
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 * In the PEi386 case, open the DLLs and put handles to them in a
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 * linked list.  When looking for a symbol, try all handles in the
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 * list.  This means that we need to load even DLLs that are guaranteed
 * to be in the ghc.exe image already, just so we can get a handle
 * to give to loadSymbol, so that we can find the symbols.  For such
 * libraries, the LoadLibrary call should be a no-op except for returning
 * the handle.
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 *
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 */
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#if defined(OBJFORMAT_PEi386)
/* A record for storing handles into DLLs. */

typedef
   struct _OpenedDLL {
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      char*              name;
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      struct _OpenedDLL* next;
      HINSTANCE instance;
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   }
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   OpenedDLL;

/* A list thereof. */
static OpenedDLL* opened_dlls = NULL;
#endif

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#  if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
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static char *
internal_dlopen(const char *dll_name)
{
   void *hdl;
   char *errmsg, *errmsg_copy;
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   // omitted: RTLD_NOW
   // see http://www.haskell.org/pipermail/cvs-ghc/2007-September/038570.html
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   IF_DEBUG(linker,
      debugBelch("internal_dlopen: dll_name = '%s'\n", dll_name));

   //-------------- Begin critical section ------------------
   // This critical section is necessary because dlerror() is not
   // required to be reentrant (see POSIX -- IEEE Std 1003.1-2008)
   // Also, the error message returned must be copied to preserve it
   // (see POSIX also)

   ACQUIRE_LOCK(&dl_mutex);
   hdl = dlopen(dll_name, RTLD_LAZY | RTLD_GLOBAL);
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   errmsg = NULL;
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   if (hdl == NULL) {
      /* dlopen failed; return a ptr to the error msg. */
      errmsg = dlerror();
      if (errmsg == NULL) errmsg = "addDLL: unknown error";
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      errmsg_copy = stgMallocBytes(strlen(errmsg)+1, "addDLL");
      strcpy(errmsg_copy, errmsg);
      errmsg = errmsg_copy;
   }
   RELEASE_LOCK(&dl_mutex);
   //--------------- End critical section -------------------

   return errmsg;
}
#  endif

const char *
addDLL( char *dll_name )
{
#  if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
   /* ------------------- ELF DLL loader ------------------- */

#define NMATCH 5
   regmatch_t match[NMATCH];
   char *errmsg;
   FILE* fp;
   size_t match_length;
#define MAXLINE 1000
   char line[MAXLINE];
   int result;

   initLinker();

   IF_DEBUG(linker, debugBelch("addDLL: dll_name = '%s'\n", dll_name));
   errmsg = internal_dlopen(dll_name);

   if (errmsg == NULL) {
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      return NULL;
   }
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   // GHC Trac ticket #2615
   // On some systems (e.g., Gentoo Linux) dynamic files (e.g. libc.so)
   // contain linker scripts rather than ELF-format object code. This
   // code handles the situation by recognizing the real object code
   // file name given in the linker script.
   //
   // If an "invalid ELF header" error occurs, it is assumed that the
   // .so file contains a linker script instead of ELF object code.
   // In this case, the code looks for the GROUP ( ... ) linker
   // directive. If one is found, the first file name inside the
   // parentheses is treated as the name of a dynamic library and the
   // code attempts to dlopen that file. If this is also unsuccessful,
   // an error message is returned.

   // see if the error message is due to an invalid ELF header
   IF_DEBUG(linker, debugBelch("errmsg = '%s'\n", errmsg));
   result = regexec(&re_invalid, errmsg, (size_t) NMATCH, match, 0);
   IF_DEBUG(linker, debugBelch("result = %i\n", result));
   if (result == 0) {
      // success -- try to read the named file as a linker script
      match_length = (size_t) stg_min((match[1].rm_eo - match[1].rm_so),
		                 MAXLINE-1);
      strncpy(line, (errmsg+(match[1].rm_so)),match_length);
      line[match_length] = '\0'; // make sure string is null-terminated
      IF_DEBUG(linker, debugBelch ("file name = '%s'\n", line));
      if ((fp = fopen(line, "r")) == NULL) {
	 return errmsg;	// return original error if open fails
      }
      // try to find a GROUP ( ... ) command
      while (fgets(line, MAXLINE, fp) != NULL) {
	 IF_DEBUG(linker, debugBelch("input line = %s", line));
	 if (regexec(&re_realso, line, (size_t) NMATCH, match, 0) == 0) {
            // success -- try to dlopen the first named file
            IF_DEBUG(linker, debugBelch("match%s\n",""));
	    line[match[1].rm_eo] = '\0';
	    errmsg = internal_dlopen(line+match[1].rm_so);
	    break;
	 }
	 // if control reaches here, no GROUP ( ... ) directive was found
	 // and the original error message is returned to the caller
      }
      fclose(fp);
   }
   return errmsg;
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#  elif defined(OBJFORMAT_PEi386)
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   /* ------------------- Win32 DLL loader ------------------- */
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   char*      buf;
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   OpenedDLL* o_dll;
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   HINSTANCE  instance;
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   initLinker();

1335
   /* debugBelch("\naddDLL; dll_name = `%s'\n", dll_name); */
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   /* See if we've already got it, and ignore if so. */
   for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
      if (0 == strcmp(o_dll->name, dll_name))
         return NULL;
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   }

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   /* The file name has no suffix (yet) so that we can try
      both foo.dll and foo.drv

      The documentation for LoadLibrary says:
      	If no file name extension is specified in the lpFileName
      	parameter, the default library extension .dll is
      	appended. However, the file name string can include a trailing
      	point character (.) to indicate that the module name has no
      	extension. */

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   buf = stgMallocBytes(strlen(dll_name) + 10, "addDLL");
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   sprintf(buf, "%s.DLL", dll_name);
   instance = LoadLibrary(buf);
   if (instance == NULL) {
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       if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
       // KAA: allow loading of drivers (like winspool.drv)
       sprintf(buf, "%s.DRV", dll_name);
       instance = LoadLibrary(buf);
       if (instance == NULL) {
           if (GetLastError() != ERROR_MOD_NOT_FOUND) goto error;
           // #1883: allow loading of unix-style libfoo.dll DLLs
           sprintf(buf, "lib%s.DLL", dll_name);
           instance = LoadLibrary(buf);
           if (instance == NULL) {
               goto error;
           }
       }
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   }
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   stgFree(buf);
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   /* Add this DLL to the list of DLLs in which to search for symbols. */
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   o_dll = stgMallocBytes( sizeof(OpenedDLL), "addDLL" );
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   o_dll->name     = stgMallocBytes(1+strlen(dll_name), "addDLL");
   strcpy(o_dll->name, dll_name);
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   o_dll->instance = instance;
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   o_dll->next     = opened_dlls;
   opened_dlls     = o_dll;
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   return NULL;
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error:
   stgFree(buf);
   sysErrorBelch(dll_name);
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   /* LoadLibrary failed; return a ptr to the error msg. */
   return "addDLL: could not load DLL";
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#  else
   barf("addDLL: not implemented on this platform");
#  endif
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