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Edit File : dyld.c \| Size : 13.30 KB
/* loader-dyld.c -- dynamic linking on darwin and OS X Copyright (C) 1998-2000, 2004, 2006-2008, 2011-2015 Free Software Foundation, Inc. Written by Peter O'Gorman, 1998 NOTE: The canonical source of this file is maintained with the GNU Libtool package. Report bugs to bug-libtool@gnu.org. GNU Libltdl is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. As a special exception to the GNU Lesser General Public License, if you distribute this file as part of a program or library that is built using GNU Libtool, you may include this file under the same distribution terms that you use for the rest of that program. GNU Libltdl is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with GNU Libltdl; see the file COPYING.LIB. If not, a copy can be downloaded from http://www.gnu.org/licenses/lgpl.html, or obtained by writing to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. / #include "lt__private.h" #include "lt_dlloader.h" / Use the preprocessor to rename non-static symbols to avoid namespace collisions when the loader code is statically linked into libltdl. Use the "<module_name>_LTX_" prefix so that the symbol addresses can be fetched from the preloaded symbol list by lt_dlsym(): / #define get_vtable dyld_LTX_get_vtable LT_BEGIN_C_DECLS LT_SCOPE lt_dlvtable get_vtable (lt_user_data loader_data); LT_END_C_DECLS /* Boilerplate code to set up the vtable for hooking this loader into libltdl's loader list: / static int vl_init (lt_user_data loader_data); static int vl_exit (lt_user_data loader_data); static lt_module vm_open (lt_user_data loader_data, const char filename, lt_dladvise advise); static int vm_close (lt_user_data loader_data, lt_module module); static void * vm_sym (lt_user_data loader_data, lt_module module, const char symbolname); static lt_dlvtable vtable = 0; /* Return the vtable for this loader, only the name and sym_prefix attributes (plus the virtual function implementations, obviously) change between loaders. / lt_dlvtable get_vtable (lt_user_data loader_data) { if (!vtable) { vtable = lt__zalloc (sizeof vtable); } if (vtable && !vtable->name) { vtable->name = "lt_dyld"; vtable->sym_prefix = "_"; vtable->dlloader_init = vl_init; vtable->module_open = vm_open; vtable->module_close = vm_close; vtable->find_sym = vm_sym; vtable->dlloader_exit = vl_exit; vtable->dlloader_data = loader_data; vtable->priority = LT_DLLOADER_APPEND; } if (vtable && (vtable->dlloader_data != loader_data)) { LT__SETERROR (INIT_LOADER); return 0; } return vtable; } / --- IMPLEMENTATION --- / #if defined HAVE_MACH_O_DYLD_H # if !defined __APPLE_CC__ && !defined __MWERKS__ && !defined __private_extern__ / Is this correct? Does it still function properly? / # define __private_extern__ extern # endif # include <mach-o/dyld.h> #endif #include <mach-o/getsect.h> / We have to put some stuff here that isn't in older dyld.h files / #if !defined ENUM_DYLD_BOOL # define ENUM_DYLD_BOOL # undef FALSE # undef TRUE enum DYLD_BOOL { FALSE, TRUE }; #endif #if !defined LC_REQ_DYLD # define LC_REQ_DYLD 0x80000000 #endif #if !defined LC_LOAD_WEAK_DYLIB # define LC_LOAD_WEAK_DYLIB (0x18 \| LC_REQ_DYLD) #endif #if !defined NSADDIMAGE_OPTION_NONE # define NSADDIMAGE_OPTION_NONE 0x0 #endif #if !defined NSADDIMAGE_OPTION_RETURN_ON_ERROR # define NSADDIMAGE_OPTION_RETURN_ON_ERROR 0x1 #endif #if !defined NSADDIMAGE_OPTION_WITH_SEARCHING # define NSADDIMAGE_OPTION_WITH_SEARCHING 0x2 #endif #if !defined NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED # define NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED 0x4 #endif #if !defined NSADDIMAGE_OPTION_MATCH_FILENAME_BY_INSTALLNAME # define NSADDIMAGE_OPTION_MATCH_FILENAME_BY_INSTALLNAME 0x8 #endif #if !defined NSLOOKUPSYMBOLINIMAGE_OPTION_BIND # define NSLOOKUPSYMBOLINIMAGE_OPTION_BIND 0x0 #endif #if !defined NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW # define NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW 0x1 #endif #if !defined NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_FULLY # define NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_FULLY 0x2 #endif #if !defined NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR # define NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR 0x4 #endif #define LT__SYMLOOKUP_OPTS (NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW \ \| NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR) #if defined __BIG_ENDIAN__ # define LT__MAGIC MH_MAGIC #else # define LT__MAGIC MH_CIGAM #endif #define DYLD__SETMYERROR(errmsg) LT__SETERRORSTR (dylderror (errmsg)) #define DYLD__SETERROR(errcode) DYLD__SETMYERROR (LT__STRERROR (errcode)) typedef struct mach_header mach_header; typedef struct dylib_command dylib_command; static const char dylderror (const char errmsg); static const mach_header lt__nsmodule_get_header (NSModule module); static const char lt__header_get_instnam (const mach_header mh); static const mach_header lt__match_loadedlib (const char name); static NSSymbol lt__linkedlib_symbol (const char symname, const mach_header mh); static const mach_header (lt__addimage) (const char image_name, unsigned long options) = 0; static NSSymbol (lt__image_symbol) (const mach_header image, const char symbolName, unsigned long options) = 0; static enum DYLD_BOOL (lt__image_symbol_p) (const mach_header image, const char symbolName) = 0; static enum DYLD_BOOL (lt__module_export) (NSModule module) = 0; static int dyld_cannot_close = 0; /* A function called through the vtable when this loader is no longer needed by the application. / static int vl_exit (lt_user_data loader_data LT__UNUSED) { vtable = NULL; return 0; } / A function called through the vtable to initialise this loader. / static int vl_init (lt_user_data loader_data) { int errors = 0; if (! dyld_cannot_close) { if (!_dyld_present ()) { ++errors; } else { (void) _dyld_func_lookup ("__dyld_NSAddImage", (unsigned long) &lt__addimage); (void) _dyld_func_lookup ("__dyld_NSLookupSymbolInImage", (unsigned long)&lt__image_symbol); (void) _dyld_func_lookup ("__dyld_NSIsSymbolNameDefinedInImage", (unsigned long) &lt__image_symbol_p); (void) _dyld_func_lookup ("__dyld_NSMakePrivateModulePublic", (unsigned long) &lt__module_export); dyld_cannot_close = lt_dladderror ("can't close a dylib"); } } return errors; } / A function called through the vtable to open a module with this loader. Returns an opaque representation of the newly opened module for processing with this loader's other vtable functions. / static lt_module vm_open (lt_user_data loader_data, const char filename, lt_dladvise advise LT__UNUSED) { lt_module module = 0; NSObjectFileImage ofi = 0; if (!filename) { return (lt_module) -1; } switch (NSCreateObjectFileImageFromFile (filename, &ofi)) { case NSObjectFileImageSuccess: module = NSLinkModule (ofi, filename, NSLINKMODULE_OPTION_RETURN_ON_ERROR \| NSLINKMODULE_OPTION_PRIVATE \| NSLINKMODULE_OPTION_BINDNOW); NSDestroyObjectFileImage (ofi); if (module) { lt__module_export (module); } break; case NSObjectFileImageInappropriateFile: if (lt__image_symbol_p && lt__image_symbol) { module = (lt_module) lt__addimage(filename, NSADDIMAGE_OPTION_RETURN_ON_ERROR); } break; case NSObjectFileImageFailure: case NSObjectFileImageArch: case NSObjectFileImageFormat: case NSObjectFileImageAccess: /NOWORK/ break; } if (!module) { DYLD__SETERROR (CANNOT_OPEN); } return module; } /* A function called through the vtable when a particular module should be unloaded. / static int vm_close (lt_user_data loader_data, lt_module module) { int errors = 0; if (module != (lt_module) -1) { const mach_header mh = (const mach_header ) module; int flags = 0; if (mh->magic == LT__MAGIC) { lt_dlseterror (dyld_cannot_close); ++errors; } else { / Currently, if a module contains c++ static destructors and it is unloaded, we get a segfault in atexit(), due to compiler and dynamic loader differences of opinion, this works around that. / if ((const struct section ) NULL != getsectbynamefromheader (lt__nsmodule_get_header (module), "__DATA", "__mod_term_func")) { flags \|= NSUNLINKMODULE_OPTION_KEEP_MEMORY_MAPPED; } #if defined __ppc__ flags \|= NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES; #endif if (!NSUnLinkModule (module, flags)) { DYLD__SETERROR (CANNOT_CLOSE); ++errors; } } } return errors; } /* A function called through the vtable to get the address of a symbol loaded from a particular module. / static void vm_sym (lt_user_data loader_data, lt_module module, const char name) { NSSymbol nssym = 0; const mach_header mh = (const mach_header ) module; char saveError[256] = "Symbol not found"; if (module == (lt_module) -1) { void address, unused; _dyld_lookup_and_bind (name, (unsigned long) &address, &unused); return address; } if (mh->magic == LT__MAGIC) { if (lt__image_symbol_p && lt__image_symbol) { if (lt__image_symbol_p (mh, name)) { nssym = lt__image_symbol (mh, name, LT__SYMLOOKUP_OPTS); } } } else { nssym = NSLookupSymbolInModule (module, name); } if (!nssym) { strlcpy (saveError, dylderror (LT__STRERROR (SYMBOL_NOT_FOUND)), 255); saveError[255] = 0; if (!mh) { mh = (mach_header )lt__nsmodule_get_header (module); } nssym = lt__linkedlib_symbol (name, mh); } if (!nssym) { LT__SETERRORSTR (saveError); } return nssym ? NSAddressOfSymbol (nssym) : 0; } /* --- HELPER FUNCTIONS --- / / Return the dyld error string, or the passed in error string if none. / static const char dylderror (const char errmsg) { NSLinkEditErrors ler; int lerno; const char file; const char errstr; NSLinkEditError (&ler, &lerno, &file, &errstr); if (! (errstr && errstr)) { errstr = errmsg; } return errstr; } /* There should probably be an apple dyld api for this. / static const mach_header lt__nsmodule_get_header (NSModule module) { int i = _dyld_image_count(); const char modname = NSNameOfModule (module); const mach_header mh = 0; if (!modname) return NULL; while (i > 0) { --i; if (strneq (_dyld_get_image_name (i), modname)) { mh = _dyld_get_image_header (i); break; } } return mh; } /* NSAddImage is also used to get the loaded image, but it only works if the lib is installed, for uninstalled libs we need to check the install_names against each other. Note that this is still broken if DYLD_IMAGE_SUFFIX is set and a different lib was loaded as a result. / static const char lt__header_get_instnam (const mach_header mh) { unsigned long offset = sizeof(mach_header); const char result = 0; int j; for (j = 0; j < mh->ncmds; j++) { struct load_command lc; lc = (struct load_command) (((unsigned long) mh) + offset); if (LC_ID_DYLIB == lc->cmd) { result=(char)(((dylib_command) lc)->dylib.name.offset + (unsigned long) lc); } offset += lc->cmdsize; } return result; } static const mach_header * lt__match_loadedlib (const char name) { const mach_header mh = 0; int i = _dyld_image_count(); while (i > 0) { const char id; --i; id = lt__header_get_instnam (_dyld_get_image_header (i)); if (id && strneq (id, name)) { mh = _dyld_get_image_header (i); break; } } return mh; } / Safe to assume our mh is good. / static NSSymbol lt__linkedlib_symbol (const char symname, const mach_header mh) { NSSymbol symbol = 0; if (lt__image_symbol && NSIsSymbolNameDefined (symname)) { unsigned long offset = sizeof(mach_header); struct load_command lc; int j; for (j = 0; j < mh->ncmds; j++) { lc = (struct load_command) (((unsigned long) mh) + offset); if ((LC_LOAD_DYLIB == lc->cmd) \|\| (LC_LOAD_WEAK_DYLIB == lc->cmd)) { unsigned long base = ((dylib_command ) lc)->dylib.name.offset; char name = (char ) (base + (unsigned long) lc); const mach_header mh1 = lt__match_loadedlib (name); if (!mh1) { / Maybe NSAddImage can find it */ mh1 = lt__addimage (name, NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED \| NSADDIMAGE_OPTION_WITH_SEARCHING \| NSADDIMAGE_OPTION_RETURN_ON_ERROR); } if (mh1) { symbol = lt__image_symbol (mh1, symname, LT__SYMLOOKUP_OPTS); if (symbol) break; } } offset += lc->cmdsize; } } return symbol; } Back

Edit File : dyld.c | Size : 13.30 KB

/* loader-dyld.c -- dynamic linking on darwin and OS X

NOTE: The canonical source of this file is maintained with the
   GNU Libtool package.  Report bugs to bug-libtool@gnu.org.

GNU Libltdl is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

As a special exception to the GNU Lesser General Public License,
if you distribute this file as part of a program or library that
is built using GNU Libtool, you may include this file under the
same distribution terms that you use for the rest of that program.

GNU Libltdl is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with GNU Libltdl; see the file COPYING.LIB.  If not, a
copy can be downloaded from  http://www.gnu.org/licenses/lgpl.html,
or obtained by writing to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/

#include "lt__private.h"
#include "lt_dlloader.h"

/* Use the preprocessor to rename non-static symbols to avoid namespace
   collisions when the loader code is statically linked into libltdl.
   Use the "<module_name>_LTX_" prefix so that the symbol addresses can
   be fetched from the preloaded symbol list by lt_dlsym():  */
#define get_vtable	dyld_LTX_get_vtable

LT_BEGIN_C_DECLS
LT_SCOPE lt_dlvtable *get_vtable (lt_user_data loader_data);
LT_END_C_DECLS

/* Boilerplate code to set up the vtable for hooking this loader into
   libltdl's loader list:  */
static int	 vl_init  (lt_user_data loader_data);
static int	 vl_exit  (lt_user_data loader_data);
static lt_module vm_open  (lt_user_data loader_data, const char *filename,
                           lt_dladvise advise);
static int	 vm_close (lt_user_data loader_data, lt_module module);
static void *	 vm_sym   (lt_user_data loader_data, lt_module module,
			  const char *symbolname);

static lt_dlvtable *vtable = 0;

/* Return the vtable for this loader, only the name and sym_prefix
   attributes (plus the virtual function implementations, obviously)
   change between loaders.  */
lt_dlvtable *
get_vtable (lt_user_data loader_data)
{
  if (!vtable)
    {
      vtable = lt__zalloc (sizeof *vtable);
    }

if (vtable && !vtable->name)
    {
      vtable->name		= "lt_dyld";
      vtable->sym_prefix	= "_";
      vtable->dlloader_init	= vl_init;
      vtable->module_open	= vm_open;
      vtable->module_close	= vm_close;
      vtable->find_sym		= vm_sym;
      vtable->dlloader_exit	= vl_exit;
      vtable->dlloader_data	= loader_data;
      vtable->priority		= LT_DLLOADER_APPEND;
    }

if (vtable && (vtable->dlloader_data != loader_data))
    {
      LT__SETERROR (INIT_LOADER);
      return 0;
    }

return vtable;
}

/* --- IMPLEMENTATION --- */

#if defined HAVE_MACH_O_DYLD_H
#  if !defined __APPLE_CC__ && !defined __MWERKS__ && !defined __private_extern__
  /* Is this correct? Does it still function properly? */
#    define __private_extern__ extern
#  endif
#  include <mach-o/dyld.h>
#endif

#include <mach-o/getsect.h>

/* We have to put some stuff here that isn't in older dyld.h files */
#if !defined ENUM_DYLD_BOOL
# define ENUM_DYLD_BOOL
# undef FALSE
# undef TRUE
 enum DYLD_BOOL {
    FALSE,
    TRUE
 };
#endif
#if !defined LC_REQ_DYLD
# define LC_REQ_DYLD 0x80000000
#endif
#if !defined LC_LOAD_WEAK_DYLIB
# define LC_LOAD_WEAK_DYLIB (0x18 | LC_REQ_DYLD)
#endif

#if !defined NSADDIMAGE_OPTION_NONE
#  define NSADDIMAGE_OPTION_NONE                          0x0
#endif
#if !defined NSADDIMAGE_OPTION_RETURN_ON_ERROR
#  define NSADDIMAGE_OPTION_RETURN_ON_ERROR               0x1
#endif
#if !defined NSADDIMAGE_OPTION_WITH_SEARCHING
#  define NSADDIMAGE_OPTION_WITH_SEARCHING                0x2
#endif
#if !defined NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED
#  define NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED         0x4
#endif
#if !defined NSADDIMAGE_OPTION_MATCH_FILENAME_BY_INSTALLNAME
#  define NSADDIMAGE_OPTION_MATCH_FILENAME_BY_INSTALLNAME 0x8
#endif

#if !defined NSLOOKUPSYMBOLINIMAGE_OPTION_BIND
#  define NSLOOKUPSYMBOLINIMAGE_OPTION_BIND               0x0
#endif
#if !defined NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW
#  define NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW           0x1
#endif
#if !defined NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_FULLY
#  define NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_FULLY         0x2
#endif
#if !defined NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR
#  define NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR    0x4
#endif

#define LT__SYMLOOKUP_OPTS	(NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW \
				| NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR)

#if defined __BIG_ENDIAN__
#  define LT__MAGIC	MH_MAGIC
#else
#  define LT__MAGIC	MH_CIGAM
#endif

#define DYLD__SETMYERROR(errmsg)    LT__SETERRORSTR (dylderror (errmsg))
#define DYLD__SETERROR(errcode)	    DYLD__SETMYERROR (LT__STRERROR (errcode))

typedef struct mach_header mach_header;
typedef struct dylib_command dylib_command;

static const char *dylderror (const char *errmsg);
static const mach_header *lt__nsmodule_get_header (NSModule module);
static const char *lt__header_get_instnam (const mach_header *mh);
static const mach_header *lt__match_loadedlib (const char *name);
static NSSymbol lt__linkedlib_symbol (const char *symname, const mach_header *mh);

static const mach_header *(*lt__addimage)	(const char *image_name,
						 unsigned long options) = 0;
static NSSymbol	(*lt__image_symbol)		(const mach_header *image,
						 const char *symbolName,
						 unsigned long options) = 0;
static enum DYLD_BOOL (*lt__image_symbol_p)	(const mach_header *image,
						 const char *symbolName) = 0;
static enum DYLD_BOOL (*lt__module_export)	(NSModule module) = 0;

static int dyld_cannot_close				  = 0;

/* A function called through the vtable when this loader is no
   longer needed by the application.  */
static int
vl_exit (lt_user_data loader_data LT__UNUSED)
{
  vtable = NULL;
  return 0;
}

/* A function called through the vtable to initialise this loader.  */
static int
vl_init (lt_user_data loader_data)
{
  int errors = 0;

if (! dyld_cannot_close)
    {
      if (!_dyld_present ())
	{
	  ++errors;
	}
      else
	{
	  (void) _dyld_func_lookup ("__dyld_NSAddImage",
				    (unsigned long*) &lt__addimage);
	  (void) _dyld_func_lookup ("__dyld_NSLookupSymbolInImage",
				    (unsigned long*)&lt__image_symbol);
	  (void) _dyld_func_lookup ("__dyld_NSIsSymbolNameDefinedInImage",
				    (unsigned long*) &lt__image_symbol_p);
	  (void) _dyld_func_lookup ("__dyld_NSMakePrivateModulePublic",
				    (unsigned long*) &lt__module_export);
	  dyld_cannot_close = lt_dladderror ("can't close a dylib");
	}
    }

return errors;
}

/* A function called through the vtable to open a module with this
   loader.  Returns an opaque representation of the newly opened
   module for processing with this loader's other vtable functions.  */
static lt_module
vm_open (lt_user_data loader_data, const char *filename,
         lt_dladvise advise LT__UNUSED)
{
  lt_module module = 0;
  NSObjectFileImage ofi = 0;

if (!filename)
    {
      return (lt_module) -1;
    }

switch (NSCreateObjectFileImageFromFile (filename, &ofi))
    {
    case NSObjectFileImageSuccess:
      module = NSLinkModule (ofi, filename, NSLINKMODULE_OPTION_RETURN_ON_ERROR
					    | NSLINKMODULE_OPTION_PRIVATE
					    | NSLINKMODULE_OPTION_BINDNOW);
      NSDestroyObjectFileImage (ofi);

if (module)
	{
	  lt__module_export (module);
	}
      break;

case NSObjectFileImageInappropriateFile:
      if (lt__image_symbol_p && lt__image_symbol)
	{
	  module = (lt_module) lt__addimage(filename,
					    NSADDIMAGE_OPTION_RETURN_ON_ERROR);
	}
      break;

case NSObjectFileImageFailure:
    case NSObjectFileImageArch:
    case NSObjectFileImageFormat:
    case NSObjectFileImageAccess:
      /*NOWORK*/
      break;
    }

if (!module)
    {
      DYLD__SETERROR (CANNOT_OPEN);
    }

return module;
}

/* A function called through the vtable when a particular module
   should be unloaded.  */
static int
vm_close (lt_user_data loader_data, lt_module module)
{
  int errors = 0;

if (module != (lt_module) -1)
    {
      const mach_header *mh = (const mach_header *) module;
      int flags = 0;
      if (mh->magic == LT__MAGIC)
	{
	  lt_dlseterror (dyld_cannot_close);
	  ++errors;
	}
      else
	{
	  /* Currently, if a module contains c++ static destructors and it
	     is unloaded, we get a segfault in atexit(), due to compiler and
	     dynamic loader differences of opinion, this works around that.  */
	  if ((const struct section *) NULL !=
	      getsectbynamefromheader (lt__nsmodule_get_header (module),
				       "__DATA", "__mod_term_func"))
	    {
	      flags |= NSUNLINKMODULE_OPTION_KEEP_MEMORY_MAPPED;
	    }
#if defined __ppc__
	  flags |= NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES;
#endif
	  if (!NSUnLinkModule (module, flags))
	    {
	      DYLD__SETERROR (CANNOT_CLOSE);
	      ++errors;
	    }
	}
    }

return errors;
}

/* A function called through the vtable to get the address of
   a symbol loaded from a particular module.  */
static void *
vm_sym (lt_user_data loader_data, lt_module module, const char *name)
{
  NSSymbol *nssym = 0;
  const mach_header *mh = (const mach_header *) module;
  char saveError[256] = "Symbol not found";

if (module == (lt_module) -1)
    {
      void *address, *unused;
      _dyld_lookup_and_bind (name, (unsigned long*) &address, &unused);
      return address;
    }

if (mh->magic == LT__MAGIC)
    {
      if (lt__image_symbol_p && lt__image_symbol)
	{
	  if (lt__image_symbol_p (mh, name))
	    {
	      nssym = lt__image_symbol (mh, name, LT__SYMLOOKUP_OPTS);
	    }
	}

}
  else
    {
      nssym = NSLookupSymbolInModule (module, name);
    }

if (!nssym)
    {
      strlcpy (saveError, dylderror (LT__STRERROR (SYMBOL_NOT_FOUND)), 255);
      saveError[255] = 0;
      if (!mh)
	{
	  mh = (mach_header *)lt__nsmodule_get_header (module);
	}
      nssym = lt__linkedlib_symbol (name, mh);
    }

if (!nssym)
    {
      LT__SETERRORSTR (saveError);
    }

return nssym ? NSAddressOfSymbol (nssym) : 0;
}

/* --- HELPER FUNCTIONS --- */

/* Return the dyld error string, or the passed in error string if none. */
static const char *
dylderror (const char *errmsg)
{
  NSLinkEditErrors ler;
  int lerno;
  const char *file;
  const char *errstr;

NSLinkEditError (&ler, &lerno, &file, &errstr);

if (! (errstr && *errstr))
    {
      errstr = errmsg;
    }

return errstr;
}

/* There should probably be an apple dyld api for this. */
static const mach_header *
lt__nsmodule_get_header (NSModule module)
{
  int i = _dyld_image_count();
  const char *modname = NSNameOfModule (module);
  const mach_header *mh = 0;

if (!modname)
    return NULL;

while (i > 0)
    {
      --i;
      if (strneq (_dyld_get_image_name (i), modname))
	{
	  mh = _dyld_get_image_header (i);
	  break;
	}
    }

return mh;
}

/* NSAddImage is also used to get the loaded image, but it only works if
   the lib is installed, for uninstalled libs we need to check the
   install_names against each other.  Note that this is still broken if
   DYLD_IMAGE_SUFFIX is set and a different lib was loaded as a result.  */
static const char *
lt__header_get_instnam (const mach_header *mh)
{
  unsigned long offset = sizeof(mach_header);
  const char* result   = 0;
  int j;

for (j = 0; j < mh->ncmds; j++)
    {
      struct load_command *lc;

lc = (struct load_command*) (((unsigned long) mh) + offset);
      if (LC_ID_DYLIB == lc->cmd)
	{
	  result=(char*)(((dylib_command*) lc)->dylib.name.offset +
			 (unsigned long) lc);
	}
      offset += lc->cmdsize;
    }

return result;
}

static const mach_header *
lt__match_loadedlib (const char *name)
{
  const mach_header *mh	= 0;
  int i = _dyld_image_count();

while (i > 0)
    {
      const char *id;

--i;
      id = lt__header_get_instnam (_dyld_get_image_header (i));
      if (id && strneq (id, name))
	{
	  mh = _dyld_get_image_header (i);
	  break;
	}
    }

return mh;
}

/* Safe to assume our mh is good. */
static NSSymbol
lt__linkedlib_symbol (const char *symname, const mach_header *mh)
{
  NSSymbol symbol = 0;

if (lt__image_symbol && NSIsSymbolNameDefined (symname))
    {
      unsigned long offset = sizeof(mach_header);
      struct load_command *lc;
      int j;

for (j = 0; j < mh->ncmds; j++)
	{
	  lc = (struct load_command*) (((unsigned long) mh) + offset);
	  if ((LC_LOAD_DYLIB == lc->cmd) || (LC_LOAD_WEAK_DYLIB == lc->cmd))
	    {
	      unsigned long base = ((dylib_command *) lc)->dylib.name.offset;
	      char *name = (char *) (base + (unsigned long) lc);
	      const mach_header *mh1 = lt__match_loadedlib (name);

if (!mh1)
		{
		  /* Maybe NSAddImage can find it */
		  mh1 = lt__addimage (name,
				      NSADDIMAGE_OPTION_RETURN_ONLY_IF_LOADED
				      | NSADDIMAGE_OPTION_WITH_SEARCHING
				      | NSADDIMAGE_OPTION_RETURN_ON_ERROR);
		}

if (mh1)
		{
		  symbol = lt__image_symbol (mh1, symname, LT__SYMLOOKUP_OPTS);
		  if (symbol)
		    break;
		}
	    }

offset += lc->cmdsize;
	}
    }

return symbol;
}

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