Linker.c 144 KB
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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 "RtsFlags.h"
#include "HsFFI.h"
#include "Hash.h"
#include "Linker.h"
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#include "LinkerInternals.h"
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#include "RtsUtils.h"
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#include "Schedule.h"
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#include "Sparks.h"
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#include "RtsTypeable.h"
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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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#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(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_HOST_OS)
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#define USE_MMAP
#include <fcntl.h>
#include <sys/mman.h>
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#if defined(openbsd_HOST_OS) || defined(linux_HOST_OS) || defined(freebsd_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(netbsd_HOST_OS) || defined(openbsd_HOST_OS)
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#  define OBJFORMAT_ELF
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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)
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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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#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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#if defined(x86_64_HOST_ARCH) && defined(OBJFORMAT_ELF)
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static void*x86_64_high_symbol( char *lbl, void *addr );
#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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#if !defined(PAR)
#define Maybe_Stable_Names      SymX(mkWeakzh_fast)			\
      				SymX(makeStableNamezh_fast)		\
      				SymX(finalizzeWeakzh_fast)
#else
/* These are not available in GUM!!! -- HWL */
#define Maybe_Stable_Names
#endif
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#if !defined (mingw32_HOST_OS)
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#define RTS_POSIX_ONLY_SYMBOLS                  \
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      SymX(signal_handlers)			\
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      SymX(stg_sig_install)			\
      Sym(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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 */
#define RTS_CYGWIN_ONLY_SYMBOLS                 \
      SymX(regfree)                             \
      SymX(regexec)                             \
      SymX(regerror)                            \
      SymX(regcomp)                             \
      SymX(__errno)                             \
      SymX(access)                              \
      SymX(chmod)                               \
      SymX(chdir)                               \
      SymX(close)                               \
      SymX(creat)                               \
      SymX(dup)                                 \
      SymX(dup2)                                \
      SymX(fstat)                               \
      SymX(fcntl)                               \
      SymX(getcwd)                              \
      SymX(getenv)                              \
      SymX(lseek)                               \
      SymX(open)                                \
      SymX(fpathconf)                           \
      SymX(pathconf)                            \
      SymX(stat)                                \
      SymX(pow)                                 \
      SymX(tanh)                                \
      SymX(cosh)                                \
      SymX(sinh)                                \
      SymX(atan)                                \
      SymX(acos)                                \
      SymX(asin)                                \
      SymX(tan)                                 \
      SymX(cos)                                 \
      SymX(sin)                                 \
      SymX(exp)                                 \
      SymX(log)                                 \
      SymX(sqrt)                                \
      SymX(localtime_r)                         \
      SymX(gmtime_r)                            \
      SymX(mktime)                              \
      Sym(_imp___tzname)                        \
      SymX(gettimeofday)                        \
      SymX(timezone)                            \
      SymX(tcgetattr)                           \
      SymX(tcsetattr)                           \
      SymX(memcpy)                              \
      SymX(memmove)                             \
      SymX(realloc)                             \
      SymX(malloc)                              \
      SymX(free)                                \
      SymX(fork)                                \
      SymX(lstat)                               \
      SymX(isatty)                              \
      SymX(mkdir)                               \
      SymX(opendir)                             \
      SymX(readdir)                             \
      SymX(rewinddir)                           \
      SymX(closedir)                            \
      SymX(link)                                \
      SymX(mkfifo)                              \
      SymX(pipe)                                \
      SymX(read)                                \
      SymX(rename)                              \
      SymX(rmdir)                               \
      SymX(select)                              \
      SymX(system)                              \
      SymX(write)                               \
      SymX(strcmp)                              \
      SymX(strcpy)                              \
      SymX(strncpy)                             \
      SymX(strerror)                            \
      SymX(sigaddset)                           \
      SymX(sigemptyset)                         \
      SymX(sigprocmask)                         \
      SymX(umask)                               \
      SymX(uname)                               \
      SymX(unlink)                              \
      SymX(utime)                               \
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      SymX(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                    \
      Sym(_imp____mb_cur_max)                   \
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      Sym(_imp___pctype)
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#else
#define RTS_MINGW_EXTRA_SYMS
#endif

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#if HAVE_GETTIMEOFDAY
#define RTS_MINGW_GETTIMEOFDAY_SYM Sym(gettimeofday)
#else
#define RTS_MINGW_GETTIMEOFDAY_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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      SymX(asyncReadzh_fast)			\
      SymX(asyncWritezh_fast)			\
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      SymX(asyncDoProczh_fast)			\
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      SymX(memset)                              \
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      SymX(inet_ntoa)                           \
      SymX(inet_addr)                           \
      SymX(htonl)                               \
      SymX(recvfrom)                            \
      SymX(listen)                              \
      SymX(bind)                                \
      SymX(shutdown)                            \
      SymX(connect)                             \
      SymX(htons)                               \
      SymX(ntohs)                               \
      SymX(getservbyname)                       \
      SymX(getservbyport)                       \
      SymX(getprotobynumber)                    \
      SymX(getprotobyname)                      \
      SymX(gethostbyname)                       \
      SymX(gethostbyaddr)                       \
      SymX(gethostname)                         \
      SymX(strcpy)                              \
      SymX(strncpy)                             \
      SymX(abort)                               \
      Sym(_alloca)                              \
      Sym(isxdigit)                             \
      Sym(isupper)                              \
      Sym(ispunct)                              \
      Sym(islower)                              \
      Sym(isspace)                              \
      Sym(isprint)                              \
      Sym(isdigit)                              \
      Sym(iscntrl)                              \
      Sym(isalpha)                              \
      Sym(isalnum)                              \
      SymX(strcmp)                              \
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      SymX(memmove)                             \
      SymX(realloc)                             \
      SymX(malloc)                              \
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      SymX(pow)                                 \
      SymX(tanh)                                \
      SymX(cosh)                                \
      SymX(sinh)                                \
      SymX(atan)                                \
      SymX(acos)                                \
      SymX(asin)                                \
      SymX(tan)                                 \
      SymX(cos)                                 \
      SymX(sin)                                 \
      SymX(exp)                                 \
      SymX(log)                                 \
      SymX(sqrt)                                \
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      SymX(powf)                                 \
      SymX(tanhf)                                \
      SymX(coshf)                                \
      SymX(sinhf)                                \
      SymX(atanf)                                \
      SymX(acosf)                                \
      SymX(asinf)                                \
      SymX(tanf)                                 \
      SymX(cosf)                                 \
      SymX(sinf)                                 \
      SymX(expf)                                 \
      SymX(logf)                                 \
      SymX(sqrtf)                                \
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      SymX(memcpy)                              \
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      SymX(rts_InstallConsoleEvent)             \
      SymX(rts_ConsoleHandlerDone)              \
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      Sym(mktime)                               \
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      Sym(_imp___timezone)                      \
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      Sym(_imp___tzname)                        \
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      Sym(_imp__tzname)                         \
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      Sym(_imp___iob)                           \
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      Sym(_imp___osver)                         \
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      Sym(localtime)                            \
      Sym(gmtime)                               \
      Sym(opendir)                              \
      Sym(readdir)                              \
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      Sym(rewinddir)                            \
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      RTS_MINGW_EXTRA_SYMS                      \
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      RTS_MINGW_GETTIMEOFDAY_SYM		\
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      Sym(closedir)
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#endif
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#if defined(darwin_TARGET_OS) && HAVE_PRINTF_LDBLSTUB
#define RTS_DARWIN_ONLY_SYMBOLS			\
     Sym(asprintf$LDBLStub)                     \
     Sym(err$LDBLStub)                          \
     Sym(errc$LDBLStub)                         \
     Sym(errx$LDBLStub)                         \
     Sym(fprintf$LDBLStub)                      \
     Sym(fscanf$LDBLStub)                       \
     Sym(fwprintf$LDBLStub)                     \
     Sym(fwscanf$LDBLStub)                      \
     Sym(printf$LDBLStub)                       \
     Sym(scanf$LDBLStub)                        \
     Sym(snprintf$LDBLStub)                     \
     Sym(sprintf$LDBLStub)                      \
     Sym(sscanf$LDBLStub)                       \
     Sym(strtold$LDBLStub)                      \
     Sym(swprintf$LDBLStub)                     \
     Sym(swscanf$LDBLStub)                      \
     Sym(syslog$LDBLStub)                       \
     Sym(vasprintf$LDBLStub)                    \
     Sym(verr$LDBLStub)                         \
     Sym(verrc$LDBLStub)                        \
     Sym(verrx$LDBLStub)                        \
     Sym(vfprintf$LDBLStub)                     \
     Sym(vfscanf$LDBLStub)                      \
     Sym(vfwprintf$LDBLStub)                    \
     Sym(vfwscanf$LDBLStub)                     \
     Sym(vprintf$LDBLStub)                      \
     Sym(vscanf$LDBLStub)                       \
     Sym(vsnprintf$LDBLStub)                    \
     Sym(vsprintf$LDBLStub)                     \
     Sym(vsscanf$LDBLStub)                      \
     Sym(vswprintf$LDBLStub)                    \
     Sym(vswscanf$LDBLStub)                     \
     Sym(vsyslog$LDBLStub)                      \
     Sym(vwarn$LDBLStub)                        \
     Sym(vwarnc$LDBLStub)                       \
     Sym(vwarnx$LDBLStub)                       \
     Sym(vwprintf$LDBLStub)                     \
     Sym(vwscanf$LDBLStub)                      \
     Sym(warn$LDBLStub)                         \
     Sym(warnc$LDBLStub)                        \
     Sym(warnx$LDBLStub)                        \
     Sym(wcstold$LDBLStub)                      \
     Sym(wprintf$LDBLStub)                      \
     Sym(wscanf$LDBLStub)
#else
#define RTS_DARWIN_ONLY_SYMBOLS
#endif

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#ifndef SMP
# define MAIN_CAP_SYM SymX(MainCapability)
#else
# define MAIN_CAP_SYM
#endif
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#if !defined(mingw32_HOST_OS)
#define RTS_USER_SIGNALS_SYMBOLS \
   SymX(setIOManagerPipe)
#else
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#define RTS_USER_SIGNALS_SYMBOLS \
   SymX(sendIOManagerEvent) \
   SymX(readIOManagerEvent) \
   SymX(getIOManagerEvent) \
   SymX(console_handler)
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#endif

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#ifdef TABLES_NEXT_TO_CODE
#define RTS_RET_SYMBOLS /* nothing */
#else
#define RTS_RET_SYMBOLS 			\
      SymX(stg_enter_ret)			\
      SymX(stg_gc_fun_ret)			\
      SymX(stg_ap_v_ret)			\
      SymX(stg_ap_f_ret)			\
      SymX(stg_ap_d_ret)			\
      SymX(stg_ap_l_ret)			\
      SymX(stg_ap_n_ret)			\
      SymX(stg_ap_p_ret)			\
      SymX(stg_ap_pv_ret)			\
      SymX(stg_ap_pp_ret)			\
      SymX(stg_ap_ppv_ret)			\
      SymX(stg_ap_ppp_ret)			\
      SymX(stg_ap_pppv_ret)			\
      SymX(stg_ap_pppp_ret)			\
      SymX(stg_ap_ppppp_ret)			\
      SymX(stg_ap_pppppp_ret)
#endif

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#define RTS_SYMBOLS				\
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      Maybe_Stable_Names			\
      Sym(StgReturn)				\
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      SymX(stg_enter_info)			\
      SymX(stg_gc_void_info)			\
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      SymX(__stg_gc_enter_1)			\
      SymX(stg_gc_noregs)			\
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      SymX(stg_gc_unpt_r1_info)			\
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      SymX(stg_gc_unpt_r1)			\
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      SymX(stg_gc_unbx_r1_info)			\
      SymX(stg_gc_unbx_r1)			\
      SymX(stg_gc_f1_info)			\
      SymX(stg_gc_f1)				\
      SymX(stg_gc_d1_info)			\
      SymX(stg_gc_d1)				\
      SymX(stg_gc_l1_info)			\
      SymX(stg_gc_l1)				\
      SymX(__stg_gc_fun)			\
      SymX(stg_gc_fun_info)			\
      SymX(stg_gc_gen)				\
      SymX(stg_gc_gen_info)			\
      SymX(stg_gc_gen_hp)			\
      SymX(stg_gc_ut)				\
      SymX(stg_gen_yield)			\
      SymX(stg_yield_noregs)			\
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      SymX(stg_yield_to_interpreter)		\
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      SymX(stg_gen_block)			\
      SymX(stg_block_noregs)			\
      SymX(stg_block_1)				\
      SymX(stg_block_takemvar)			\
      SymX(stg_block_putmvar)			\
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      MAIN_CAP_SYM                              \
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      SymX(MallocFailHook)			\
      SymX(OnExitHook)				\
      SymX(OutOfHeapHook)			\
      SymX(StackOverflowHook)			\
      SymX(__encodeDouble)			\
      SymX(__encodeFloat)			\
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      SymX(addDLL)               		\
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      SymExtern(__gmpn_gcd_1)			\
      SymExtern(__gmpz_cmp)			\
      SymExtern(__gmpz_cmp_si)			\
      SymExtern(__gmpz_cmp_ui)			\
      SymExtern(__gmpz_get_si)			\
      SymExtern(__gmpz_get_ui)			\
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      SymX(__int_encodeDouble)			\
      SymX(__int_encodeFloat)			\
      SymX(andIntegerzh_fast)			\
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      SymX(atomicallyzh_fast)			\
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      SymX(barf)				\
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      SymX(debugBelch)				\
      SymX(errorBelch)				\
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      SymX(blockAsyncExceptionszh_fast)		\
      SymX(catchzh_fast)			\
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      SymX(catchRetryzh_fast)			\
      SymX(catchSTMzh_fast)			\
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      SymX(checkzh_fast)                        \
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      SymX(closure_flags)                       \
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      SymX(cmp_thread)				\
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      SymX(cmpIntegerzh_fast)	        	\
      SymX(cmpIntegerIntzh_fast)	      	\
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      SymX(complementIntegerzh_fast)		\
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      SymX(createAdjustor)			\
      SymX(decodeDoublezh_fast)			\
      SymX(decodeFloatzh_fast)			\
      SymX(defaultsHook)			\
      SymX(delayzh_fast)			\
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      SymX(deRefWeakzh_fast)			\
      SymX(deRefStablePtrzh_fast)		\
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      SymX(dirty_MUT_VAR)			\
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      SymX(divExactIntegerzh_fast)		\
      SymX(divModIntegerzh_fast)		\
      SymX(forkzh_fast)				\
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      SymX(forkOnzh_fast)			\
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      SymX(forkProcess)				\
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      SymX(forkOS_createThread)			\
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      SymX(freeHaskellFunctionPtr)		\
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      SymX(freeStablePtr)		        \
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      SymX(getOrSetTypeableStore)		\
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      SymX(gcdIntegerzh_fast)			\
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      SymX(gcdIntegerIntzh_fast)		\
      SymX(gcdIntzh_fast)			\
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      SymX(genSymZh)				\
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      SymX(genericRaise)			\
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      SymX(getProgArgv)				\
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      SymX(getFullProgArgv)				\
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      SymX(getStablePtr)			\
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      SymX(hs_init)				\
      SymX(hs_exit)				\
      SymX(hs_set_argv)				\
      SymX(hs_add_root)				\
      SymX(hs_perform_gc)			\
      SymX(hs_free_stable_ptr)			\
      SymX(hs_free_fun_ptr)			\
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      SymX(hs_hpc_rootModule)		        \
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      SymX(initLinker)				\
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      SymX(unpackClosurezh_fast)                \
      SymX(getApStackValzh_fast)                \
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      SymX(int2Integerzh_fast)			\
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      SymX(integer2Intzh_fast)			\
      SymX(integer2Wordzh_fast)			\
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      SymX(isCurrentThreadBoundzh_fast)		\
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      SymX(isDoubleDenormalized)		\
      SymX(isDoubleInfinite)			\
      SymX(isDoubleNaN)				\
      SymX(isDoubleNegativeZero)		\
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      SymX(isEmptyMVarzh_fast)			\
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      SymX(isFloatDenormalized)			\
      SymX(isFloatInfinite)			\
      SymX(isFloatNaN)				\
      SymX(isFloatNegativeZero)			\
      SymX(killThreadzh_fast)			\
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      SymX(loadObj)          			\
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      SymX(insertStableSymbol) 			\
      SymX(insertSymbol)     			\
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      SymX(lookupSymbol)     			\
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      SymX(makeStablePtrzh_fast)		\
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      SymX(minusIntegerzh_fast)			\
      SymX(mkApUpd0zh_fast)			\
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      SymX(myThreadIdzh_fast)			\
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      SymX(labelThreadzh_fast)                  \
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      SymX(newArrayzh_fast)			\
      SymX(newBCOzh_fast)			\
      SymX(newByteArrayzh_fast)			\
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      SymX_redirect(newCAF, newDynCAF)		\
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      SymX(newMVarzh_fast)			\
      SymX(newMutVarzh_fast)			\
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      SymX(newTVarzh_fast)			\
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      SymX(noDuplicatezh_fast)			\
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      SymX(atomicModifyMutVarzh_fast)		\
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      SymX(newPinnedByteArrayzh_fast)		\
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      SymX(newSpark)				\
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      SymX(orIntegerzh_fast)			\
      SymX(performGC)				\
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      SymX(performMajorGC)			\
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      SymX(plusIntegerzh_fast)			\
      SymX(prog_argc)				\
      SymX(prog_argv)				\
      SymX(putMVarzh_fast)			\
      SymX(quotIntegerzh_fast)			\
      SymX(quotRemIntegerzh_fast)		\
      SymX(raisezh_fast)			\
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      SymX(raiseIOzh_fast)			\
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      SymX(readTVarzh_fast)			\
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      SymX(remIntegerzh_fast)			\
      SymX(resetNonBlockingFd)			\
      SymX(resumeThread)			\
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      SymX(resolveObjs)                         \
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      SymX(retryzh_fast)                        \
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      SymX(rts_apply)				\
      SymX(rts_checkSchedStatus)		\
      SymX(rts_eval)				\
      SymX(rts_evalIO)				\
      SymX(rts_evalLazyIO)			\
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      SymX(rts_evalStableIO)			\
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      SymX(rts_eval_)				\
      SymX(rts_getBool)				\
      SymX(rts_getChar)				\
      SymX(rts_getDouble)			\
      SymX(rts_getFloat)			\
      SymX(rts_getInt)				\
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      SymX(rts_getInt8)				\
      SymX(rts_getInt16)			\
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      SymX(rts_getInt32)			\
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      SymX(rts_getInt64)			\
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      SymX(rts_getPtr)				\
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      SymX(rts_getFunPtr)			\
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      SymX(rts_getStablePtr)			\
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      SymX(rts_getThreadId)			\
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      SymX(rts_getWord)				\
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      SymX(rts_getWord8)			\
      SymX(rts_getWord16)			\
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      SymX(rts_getWord32)			\
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      SymX(rts_getWord64)			\
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      SymX(rts_lock)				\
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      SymX(rts_mkBool)				\
      SymX(rts_mkChar)				\
      SymX(rts_mkDouble)			\
      SymX(rts_mkFloat)				\
      SymX(rts_mkInt)				\
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      SymX(rts_mkInt8)				\
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      SymX(rts_mkInt16)				\
      SymX(rts_mkInt32)				\
      SymX(rts_mkInt64)				\
      SymX(rts_mkPtr)				\
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      SymX(rts_mkFunPtr)			\
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      SymX(rts_mkStablePtr)			\
      SymX(rts_mkString)			\
      SymX(rts_mkWord)				\
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      SymX(rts_mkWord8)				\
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      SymX(rts_mkWord16)			\
      SymX(rts_mkWord32)			\
      SymX(rts_mkWord64)			\
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      SymX(rts_unlock)				\
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      SymX(rtsSupportsBoundThreads)		\
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      SymX(__hscore_get_saved_termios)		\
      SymX(__hscore_set_saved_termios)		\
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      SymX(setProgArgv)				\
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      SymX(startupHaskell)			\
      SymX(shutdownHaskell)			\
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      SymX(shutdownHaskellAndExit)		\
      SymX(stable_ptr_table)			\
      SymX(stackOverflow)			\
      SymX(stg_CAF_BLACKHOLE_info)		\
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      SymX(awakenBlockedQueue)			\
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      SymX(stg_CHARLIKE_closure)		\
      SymX(stg_EMPTY_MVAR_info)			\
      SymX(stg_IND_STATIC_info)			\
      SymX(stg_INTLIKE_closure)			\
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      SymX(stg_MUT_ARR_PTRS_DIRTY_info)		\
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      SymX(stg_MUT_ARR_PTRS_FROZEN_info)	\
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      SymX(stg_MUT_ARR_PTRS_FROZEN0_info)	\
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      SymX(stg_WEAK_info)                       \
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      SymX(stg_ap_v_info)			\
      SymX(stg_ap_f_info)			\
      SymX(stg_ap_d_info)			\
      SymX(stg_ap_l_info)			\
      SymX(stg_ap_n_info)			\
      SymX(stg_ap_p_info)			\
      SymX(stg_ap_pv_info)			\
      SymX(stg_ap_pp_info)			\
      SymX(stg_ap_ppv_info)			\
      SymX(stg_ap_ppp_info)			\
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      SymX(stg_ap_pppv_info)			\
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      SymX(stg_ap_pppp_info)			\
      SymX(stg_ap_ppppp_info)			\
      SymX(stg_ap_pppppp_info)			\
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      SymX(stg_ap_0_fast)			\
      SymX(stg_ap_v_fast)			\
      SymX(stg_ap_f_fast)			\
      SymX(stg_ap_d_fast)			\
      SymX(stg_ap_l_fast)			\
      SymX(stg_ap_n_fast)			\
      SymX(stg_ap_p_fast)			\
      SymX(stg_ap_pv_fast)			\
      SymX(stg_ap_pp_fast)			\
      SymX(stg_ap_ppv_fast)			\
      SymX(stg_ap_ppp_fast)			\
      SymX(stg_ap_pppv_fast)			\
      SymX(stg_ap_pppp_fast)			\
      SymX(stg_ap_ppppp_fast)			\
      SymX(stg_ap_pppppp_fast)			\
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      SymX(stg_ap_1_upd_info)			\
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      SymX(stg_ap_2_upd_info)			\
      SymX(stg_ap_3_upd_info)			\
      SymX(stg_ap_4_upd_info)			\
      SymX(stg_ap_5_upd_info)			\
      SymX(stg_ap_6_upd_info)			\
      SymX(stg_ap_7_upd_info)			\
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      SymX(stg_exit)				\
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      SymX(stg_sel_0_upd_info)			\
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      SymX(stg_sel_10_upd_info)			\
      SymX(stg_sel_11_upd_info)			\
      SymX(stg_sel_12_upd_info)			\
      SymX(stg_sel_13_upd_info)			\
      SymX(stg_sel_14_upd_info)			\
      SymX(stg_sel_15_upd_info)			\
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      SymX(stg_sel_1_upd_info)			\
      SymX(stg_sel_2_upd_info)			\
      SymX(stg_sel_3_upd_info)			\
      SymX(stg_sel_4_upd_info)			\
      SymX(stg_sel_5_upd_info)			\
      SymX(stg_sel_6_upd_info)			\
      SymX(stg_sel_7_upd_info)			\
      SymX(stg_sel_8_upd_info)			\
      SymX(stg_sel_9_upd_info)			\
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      SymX(stg_upd_frame_info)			\
      SymX(suspendThread)			\
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      SymX(takeMVarzh_fast)			\
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      SymX(timesIntegerzh_fast)			\
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      SymX(tryPutMVarzh_fast)			\
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      SymX(tryTakeMVarzh_fast)			\
      SymX(unblockAsyncExceptionszh_fast)	\
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      SymX(unloadObj)                           \
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      SymX(unsafeThawArrayzh_fast)		\
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      SymX(waitReadzh_fast)			\
      SymX(waitWritezh_fast)			\
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      SymX(word2Integerzh_fast)			\
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      SymX(writeTVarzh_fast)			\
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      SymX(xorIntegerzh_fast)			\
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      SymX(yieldzh_fast)                        \
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      SymX(stg_interp_constr_entry)             \
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      SymX(allocateExec)	                \
      SymX(freeExec)		                \
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      SymX(getAllocations)                      \
      SymX(revertCAFs)                          \
      SymX(RtsFlags)                            \
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      SymX(rts_breakpoint_io_action)		\
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      SymX(rts_stop_next_breakpoint)		\
      SymX(rts_stop_on_exception)		\
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      SymX(stopTimer)				\
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      RTS_USER_SIGNALS_SYMBOLS
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#ifdef SUPPORT_LONG_LONGS
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#define RTS_LONG_LONG_SYMS			\
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      SymX(int64ToIntegerzh_fast)		\
      SymX(word64ToIntegerzh_fast)
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#else
#define RTS_LONG_LONG_SYMS /* nothing */
#endif

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// 64-bit support functions in libgcc.a
#if defined(__GNUC__) && SIZEOF_VOID_P <= 4
#define RTS_LIBGCC_SYMBOLS			\
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      Sym(__divdi3)                             \
      Sym(__udivdi3)                            \
      Sym(__moddi3)                             \
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      Sym(__umoddi3)				\
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      Sym(__muldi3)				\
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      Sym(__ashldi3)				\
      Sym(__ashrdi3)				\
      Sym(__lshrdi3)				\
      Sym(__eprintf)
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#elif defined(ia64_HOST_ARCH)
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#define RTS_LIBGCC_SYMBOLS			\
      Sym(__divdi3)				\
      Sym(__udivdi3)                            \
      Sym(__moddi3)				\
      Sym(__umoddi3)				\
      Sym(__divsf3)				\
      Sym(__divdf3)
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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		\
      Sym(saveFP)				\
      Sym(restFP)
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#endif
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/* entirely bogus claims about types of these symbols */
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#define Sym(vvv)  extern void vvv(void);
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#if defined(__PIC__) && defined(mingw32_TARGET_OS)
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#define SymExtern(vvv)  extern void _imp__ ## vvv (void);
#else
#define SymExtern(vvv)  SymX(vvv)
#endif
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#define SymX(vvv) /**/
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#define SymX_redirect(vvv,xxx) /**/
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RTS_SYMBOLS
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RTS_RET_SYMBOLS
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RTS_LONG_LONG_SYMS
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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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#undef Sym
#undef SymX
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#undef SymX_redirect
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#undef SymExtern
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#ifdef LEADING_UNDERSCORE
#define MAYBE_LEADING_UNDERSCORE_STR(s) ("_" s)
#else
#define MAYBE_LEADING_UNDERSCORE_STR(s) (s)
#endif

#define Sym(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
                    (void*)(&(vvv)) },
#define SymX(vvv) Sym(vvv)
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#define SymExtern(vvv) { MAYBE_LEADING_UNDERSCORE_STR(#vvv), \
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	    (void*)DLL_IMPORT_DATA_REF(vvv) },
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// SymX_redirect allows us to redirect references to one symbol to
// another symbol.  See newCAF/newDynCAF for an example.
#define SymX_redirect(vvv,xxx) \
    { 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_LONG_LONG_SYMS
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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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#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
				   )
{
   if (lookupHashTable(table, (StgWord)key) == NULL)
   {
      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
   );
   exit(1);
}
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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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#endif
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void
initLinker( void )
{
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    RtsSymbolVal *sym;
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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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    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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#   endif
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}

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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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char *
addDLL( char *dll_name )
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{
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#  if defined(OBJFORMAT_ELF) || defined(OBJFORMAT_MACHO)
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   /* ------------------- ELF DLL loader ------------------- */
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   void *hdl;
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   char *errmsg;
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   initLinker();

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   hdl= dlopen(dll_name, RTLD_NOW | RTLD_GLOBAL);
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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";
      return errmsg;
   } else {
      return NULL;
   }
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   /*NOTREACHED*/

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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();

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   /* 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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	 sprintf(buf, "%s.DRV", dll_name);	// KAA: allow loading of drivers (like winspool.drv)
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	 instance = LoadLibrary(buf);
	 if (instance == NULL) {
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		stgFree(buf);
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	    /* LoadLibrary failed; return a ptr to the error msg. */
	    return "addDLL: unknown error";
   	 }
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   }
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   stgFree(buf);
1012

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   /* Add this DLL to the list of DLLs in which to search for symbols. */
1014
   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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#  else
   barf("addDLL: not implemented on this platform");
#  endif
}

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/* -----------------------------------------------------------------------------
 * insert a stable symbol in the hash table
 */

void
insertStableSymbol(char* obj_name, char* key, StgPtr p)
{
  ghciInsertStrHashTable(obj_name, stablehash, key, getStablePtr(p));
}


/* -----------------------------------------------------------------------------
 * insert a symbol in the hash table
 */
void
insertSymbol(char* obj_name, char* key, void* data)
{
  ghciInsertStrHashTable(obj_name, symhash, key, data);
}

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/* -----------------------------------------------------------------------------
 * lookup a symbol in the hash table
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 */
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void *
lookupSymbol( char *lbl )
{
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    void *val;
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    initLinker() ;
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    ASSERT(symhash != NULL);
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    val = lookupStrHashTable(symhash, lbl);

    if (val == NULL) {
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#       if defined(OBJFORMAT_ELF)
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#	if defined(x86_64_HOST_ARCH)
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	val = dlsym(dl_prog_handle, lbl);
	if (val >= (void *)0x80000000) {
	    void *new_val;
	    new_val = x86_64_high_symbol(lbl, val);
	    IF_DEBUG(linker,debugBelch("lookupSymbol: relocating out of range symbol: %s = %p, now %p\n", lbl, val, new_val));
	    return new_val;
	} else {
	    return val;
	}
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#	else
1071
	return dlsym(dl_prog_handle, lbl);
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#	endif
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#       elif defined(OBJFORMAT_MACHO)
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#       if HAVE_DLFCN_H
        /* On OS X 10.3 and later, we use dlsym instead of the old legacy
           interface.

           HACK: On OS X, global symbols are prefixed with an underscore.
                 However, dlsym wants us to omit the leading underscore from the
                 symbol name. For now, we simply strip it off here (and ONLY
                 here).
        */
        ASSERT(lbl[0] == '_');
        return dlsym(dl_prog_handle, lbl+1);
#       else
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	if(NSIsSymbolNameDefined(lbl)) {
	    NSSymbol symbol = NSLookupAndBindSymbol(lbl);
	    return NSAddressOfSymbol(symbol);
	} else {
	    return NULL;
	}
1092
#       endif /* HAVE_DLFCN_H */
1093
#       elif defined(OBJFORMAT_PEi386)
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        OpenedDLL* o_dll;
        void* sym;
        for (o_dll = opened_dlls; o_dll != NULL; o_dll = o_dll->next) {
1097
	  /* debugBelch("look in %s for %s\n", o_dll->name, lbl); */
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           if (lbl[0] == '_') {
              /* HACK: if the name has an initial underscore, try stripping
                 it off & look that up first. I've yet to verify whether there's