Linker.c 155 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 "RtsGlobals.h"
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#include "Timer.h"
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#include "Trace.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(linux_HOST_OS) || defined(freebsd_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(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(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) || 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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#if !defined(PAR)
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#define Maybe_Stable_Names      SymI_HasProto(mkWeakzh_fast)			\
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      				SymI_HasProto(mkWeakForeignEnvzh_fast)		\
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      				SymI_HasProto(makeStableNamezh_fast)		\
      				SymI_HasProto(finalizzeWeakzh_fast)
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#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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      SymI_HasProto(shutdownHaskellAndSignal)	\
      SymI_NeedsProto(lockFile)                 \
      SymI_NeedsProto(unlockFile)               \
      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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/* 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                           \
      SymI_HasProto(asyncReadzh_fast)			 \
      SymI_HasProto(asyncWritezh_fast)			 \
      SymI_HasProto(asyncDoProczh_fast)			 \
      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)                           \
      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)                               \
      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) \
   SymI_NeedsProto(blockUserSignals) \
   SymI_NeedsProto(unblockUserSignals)
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#else
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#define RTS_USER_SIGNALS_SYMBOLS     \
   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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/* On Windows, we link libgmp.a statically into libHSrts.dll */
#ifdef mingw32_HOST_OS
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#define GMP_SYMS				        \
      SymI_HasProto(__gmpz_cmp)				\
      SymI_HasProto(__gmpz_cmp_si)			\
      SymI_HasProto(__gmpz_cmp_ui)			\
      SymI_HasProto(__gmpz_get_si)			\
      SymI_HasProto(__gmpz_get_ui)
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#else
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#define GMP_SYMS				        \
      SymE_HasProto(__gmpz_cmp)			        \
      SymE_HasProto(__gmpz_cmp_si)			\
      SymE_HasProto(__gmpz_cmp_ui)			\
      SymE_HasProto(__gmpz_get_si)			\
      SymE_HasProto(__gmpz_get_ui)
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#endif

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#define RTS_SYMBOLS				        \
      Maybe_Stable_Names			        \
      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(__encodeDouble)			\
      SymI_HasProto(__encodeFloat)			\
      SymI_HasProto(addDLL)               		\
      GMP_SYMS					        \
      SymI_HasProto(__int_encodeDouble)			\
      SymI_HasProto(__word_encodeDouble)		\
      SymI_HasProto(__2Int_encodeDouble)		\
      SymI_HasProto(__int_encodeFloat)			\
      SymI_HasProto(__word_encodeFloat)			\
      SymI_HasProto(andIntegerzh_fast)			\
      SymI_HasProto(atomicallyzh_fast)			\
      SymI_HasProto(barf)				\
      SymI_HasProto(debugBelch)				\
      SymI_HasProto(errorBelch)				\
      SymI_HasProto(asyncExceptionsBlockedzh_fast)	\
      SymI_HasProto(blockAsyncExceptionszh_fast)	\
      SymI_HasProto(catchzh_fast)			\
      SymI_HasProto(catchRetryzh_fast)			\
      SymI_HasProto(catchSTMzh_fast)			\
      SymI_HasProto(checkzh_fast)                       \
      SymI_HasProto(closure_flags)                      \
      SymI_HasProto(cmp_thread)				\
      SymI_HasProto(cmpIntegerzh_fast)	        	\
      SymI_HasProto(cmpIntegerIntzh_fast)	      	\
      SymI_HasProto(complementIntegerzh_fast)		\
      SymI_HasProto(createAdjustor)			\
      SymI_HasProto(decodeDoublezh_fast)		\
      SymI_HasProto(decodeFloatzh_fast)			\
      SymI_HasProto(decodeDoublezu2Intzh_fast)		\
      SymI_HasProto(decodeFloatzuIntzh_fast)		\
      SymI_HasProto(defaultsHook)			\
      SymI_HasProto(delayzh_fast)			\
      SymI_HasProto(deRefWeakzh_fast)			\
      SymI_HasProto(deRefStablePtrzh_fast)		\
      SymI_HasProto(dirty_MUT_VAR)			\
      SymI_HasProto(divExactIntegerzh_fast)		\
      SymI_HasProto(divModIntegerzh_fast)		\
      SymI_HasProto(forkzh_fast)			\
      SymI_HasProto(forkOnzh_fast)			\
      SymI_HasProto(forkProcess)			\
      SymI_HasProto(forkOS_createThread)		\
      SymI_HasProto(freeHaskellFunctionPtr)		\
      SymI_HasProto(freeStablePtr)		        \
      SymI_HasProto(getOrSetTypeableStore)		\
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      SymI_HasProto(getOrSetSignalHandlerStore)		\
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      SymI_HasProto(gcdIntegerzh_fast)			\
      SymI_HasProto(gcdIntegerIntzh_fast)		\
      SymI_HasProto(gcdIntzh_fast)			\
      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)				\
      SymI_HasProto(unpackClosurezh_fast)               \
      SymI_HasProto(getApStackValzh_fast)               \
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      SymI_HasProto(getSparkzh_fast)                    \
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      SymI_HasProto(int2Integerzh_fast)			\
      SymI_HasProto(integer2Intzh_fast)			\
      SymI_HasProto(integer2Wordzh_fast)		\
      SymI_HasProto(isCurrentThreadBoundzh_fast)	\
      SymI_HasProto(isDoubleDenormalized)		\
      SymI_HasProto(isDoubleInfinite)			\
      SymI_HasProto(isDoubleNaN)			\
      SymI_HasProto(isDoubleNegativeZero)		\
      SymI_HasProto(isEmptyMVarzh_fast)			\
      SymI_HasProto(isFloatDenormalized)		\
      SymI_HasProto(isFloatInfinite)			\
      SymI_HasProto(isFloatNaN)				\
      SymI_HasProto(isFloatNegativeZero)		\
      SymI_HasProto(killThreadzh_fast)			\
      SymI_HasProto(loadObj)          			\
      SymI_HasProto(insertStableSymbol) 		\
      SymI_HasProto(insertSymbol)     			\
      SymI_HasProto(lookupSymbol)     			\
      SymI_HasProto(makeStablePtrzh_fast)		\
      SymI_HasProto(minusIntegerzh_fast)		\
      SymI_HasProto(mkApUpd0zh_fast)			\
      SymI_HasProto(myThreadIdzh_fast)			\
      SymI_HasProto(labelThreadzh_fast)                 \
      SymI_HasProto(newArrayzh_fast)			\
      SymI_HasProto(newBCOzh_fast)			\
      SymI_HasProto(newByteArrayzh_fast)		\
      SymI_HasProto_redirect(newCAF, newDynCAF)		\
      SymI_HasProto(newMVarzh_fast)			\
      SymI_HasProto(newMutVarzh_fast)			\
      SymI_HasProto(newTVarzh_fast)			\
      SymI_HasProto(noDuplicatezh_fast)			\
      SymI_HasProto(atomicModifyMutVarzh_fast)		\
      SymI_HasProto(newPinnedByteArrayzh_fast)		\
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      SymI_HasProto(newAlignedPinnedByteArrayzh_fast)	\
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      SymI_HasProto(newSpark)				\
      SymI_HasProto(orIntegerzh_fast)			\
      SymI_HasProto(performGC)				\
      SymI_HasProto(performMajorGC)			\
      SymI_HasProto(plusIntegerzh_fast)			\
      SymI_HasProto(prog_argc)				\
      SymI_HasProto(prog_argv)				\
      SymI_HasProto(putMVarzh_fast)			\
      SymI_HasProto(quotIntegerzh_fast)			\
      SymI_HasProto(quotRemIntegerzh_fast)		\
      SymI_HasProto(raisezh_fast)			\
      SymI_HasProto(raiseIOzh_fast)			\
      SymI_HasProto(readTVarzh_fast)			\
      SymI_HasProto(readTVarIOzh_fast)			\
      SymI_HasProto(remIntegerzh_fast)			\
      SymI_HasProto(resetNonBlockingFd)			\
      SymI_HasProto(resumeThread)			\
      SymI_HasProto(resolveObjs)                        \
      SymI_HasProto(retryzh_fast)                       \
      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)				\
      SymI_HasProto(rtsSupportsBoundThreads)		\
      SymI_HasProto(__hscore_get_saved_termios)		\
      SymI_HasProto(__hscore_set_saved_termios)		\
      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(awakenBlockedQueue)			\
      SymI_HasProto(startTimer)                         \
      SymI_HasProto(stg_CHARLIKE_closure)		\
      SymI_HasProto(stg_MVAR_CLEAN_info)		\
      SymI_HasProto(stg_MVAR_DIRTY_info)		\
      SymI_HasProto(stg_IND_STATIC_info)		\
      SymI_HasProto(stg_INTLIKE_closure)		\
      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)			\
      SymI_HasProto(takeMVarzh_fast)			\
      SymI_HasProto(threadStatuszh_fast)		\
      SymI_HasProto(timesIntegerzh_fast)		\
      SymI_HasProto(tryPutMVarzh_fast)			\
      SymI_HasProto(tryTakeMVarzh_fast)			\
      SymI_HasProto(unblockAsyncExceptionszh_fast)	\
      SymI_HasProto(unloadObj)                          \
      SymI_HasProto(unsafeThawArrayzh_fast)		\
      SymI_HasProto(waitReadzh_fast)			\
      SymI_HasProto(waitWritezh_fast)			\
      SymI_HasProto(word2Integerzh_fast)		\
      SymI_HasProto(writeTVarzh_fast)			\
      SymI_HasProto(xorIntegerzh_fast)			\
      SymI_HasProto(yieldzh_fast)                       \
      SymI_NeedsProto(stg_interp_constr_entry)          \
      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(traceCcszh_fast)                    \
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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			        \
      SymI_HasProto(int64ToIntegerzh_fast)		\
      SymI_HasProto(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
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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)		       \
      SymI_NeedsProto(__lshrdi3)		       \
      SymI_NeedsProto(__eprintf)
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#elif defined(ia64_HOST_ARCH)
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#define RTS_LIBGCC_SYMBOLS			        \
      SymI_NeedsProto(__divdi3)				\
      SymI_NeedsProto(__udivdi3)                        \
      SymI_NeedsProto(__moddi3)				\
      SymI_NeedsProto(__umoddi3)			\
      SymI_NeedsProto(__divsf3)				\
      SymI_NeedsProto(__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		\
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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_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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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_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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      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
				   )
{
   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"