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/* dl_dyld.xs
*
* Platform: Darwin (Mac OS)
* Author: Wilfredo Sanchez <wsanchez@apple.com>
* Based on: dl_next.xs by Paul Marquess
* Based on: dl_dlopen.xs by Anno Siegel
* Created: Aug 15th, 1994
*
*/
/*
* And Gandalf said: 'Many folk like to know beforehand what is to
* be set on the table; but those who have laboured to prepare the
* feast like to keep their secret; for wonder makes the words of
* praise louder.'
*
* [p.970 of _The Lord of the Rings_, VI/v: "The Steward and the King"]
*/
/* Porting notes:
dl_dyld.xs is based on dl_next.xs by Anno Siegel.
dl_next.xs is in turn a port from dl_dlopen.xs by Paul Marquess. It
should not be used as a base for further ports though it may be used
as an example for how dl_dlopen.xs can be ported to other platforms.
The method used here is just to supply the sun style dlopen etc.
functions in terms of NeXT's/Apple's dyld. The xs code proper is
unchanged from Paul's original.
The port could use some streamlining. For one, error handling could
be simplified.
This should be useable as a replacement for dl_next.xs, but it has not
been tested on NeXT platforms.
Wilfredo Sanchez
*/
#define PERL_EXT
#include "EXTERN.h"
#define PERL_IN_DL_DYLD_XS
#include "perl.h"
#include "XSUB.h"
#include "dlutils.c" /* for SaveError() etc */
#undef environ
#undef bool
#import <mach-o/dyld.h>
static char *dlerror()
{
dTHX;
dMY_CXT;
return dl_last_error;
}
static int dlclose(void *handle) /* stub only */
{
return 0;
}
enum dyldErrorSource
{
OFImage,
};
static void TranslateError
(const char *path, enum dyldErrorSource type, int number)
{
dTHX;
dMY_CXT;
char *error;
unsigned int index;
static char *OFIErrorStrings[] =
{
"%s(%d): Object Image Load Failure\n",
"%s(%d): Object Image Load Success\n",
"%s(%d): Not a recognisable object file\n",
"%s(%d): No valid architecture\n",
"%s(%d): Object image has an invalid format\n",
"%s(%d): Invalid access (permissions?)\n",
"%s(%d): Unknown error code from NSCreateObjectFileImageFromFile\n",
};
#define NUM_OFI_ERRORS (sizeof(OFIErrorStrings) / sizeof(OFIErrorStrings[0]))
switch (type)
{
case OFImage:
index = number;
if (index > NUM_OFI_ERRORS - 1)
index = NUM_OFI_ERRORS - 1;
error = Perl_form_nocontext(OFIErrorStrings[index], path, number);
break;
default:
error = Perl_form_nocontext("%s(%d): Totally unknown error type %d\n",
path, number, type);
break;
}
sv_setpv(MY_CXT.x_dl_last_error, error);
}
static char *dlopen(char *path)
{
int dyld_result;
NSObjectFileImage ofile;
NSModule handle = NULL;
dyld_result = NSCreateObjectFileImageFromFile(path, &ofile);
if (dyld_result != NSObjectFileImageSuccess)
TranslateError(path, OFImage, dyld_result);
else
{
// NSLinkModule will cause the run to abort on any link errors
// not very friendly but the error recovery functionality is limited.
handle = NSLinkModule(ofile, path, TRUE);
NSDestroyObjectFileImage(ofile);
}
return handle;
}
static void *
dlsym(void *handle, char *symbol)
{
void *addr;
if (NSIsSymbolNameDefined(symbol))
addr = NSAddressOfSymbol(NSLookupAndBindSymbol(symbol));
else
addr = NULL;
return addr;
}
/* ----- code from dl_dlopen.xs below here ----- */
static void
dl_private_init(pTHX)
{
(void)dl_generic_private_init(aTHX);
}
MODULE = DynaLoader PACKAGE = DynaLoader
BOOT:
(void)dl_private_init(aTHX);
void *
dl_load_file(filename, flags=0)
char * filename
int flags
CODE:
DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_load_file(%s,%x):\n", filename,flags));
if (flags & 0x01)
Perl_warn(aTHX_ "Can't make loaded symbols global on this platform while loading %s",filename);
RETVAL = dlopen(filename);
DLDEBUG(2,PerlIO_printf(Perl_debug_log, " libref=%x\n", RETVAL));
ST(0) = sv_newmortal() ;
if (RETVAL == NULL)
SaveError(aTHX_ "%s",dlerror()) ;
else
sv_setiv( ST(0), PTR2IV(RETVAL) );
void *
dl_find_symbol(libhandle, symbolname, ign_err=0)
void * libhandle
char * symbolname
int ign_err
CODE:
symbolname = Perl_form_nocontext("_%s", symbolname);
DLDEBUG(2, PerlIO_printf(Perl_debug_log,
"dl_find_symbol(handle=%lx, symbol=%s)\n",
(unsigned long) libhandle, symbolname));
RETVAL = dlsym(libhandle, symbolname);
DLDEBUG(2, PerlIO_printf(Perl_debug_log,
" symbolref = %lx\n", (unsigned long) RETVAL));
ST(0) = sv_newmortal() ;
if (RETVAL == NULL) {
if (!ign_err)
SaveError(aTHX_ "%s",dlerror()) ;
} else
sv_setiv( ST(0), PTR2IV(RETVAL) );
void
dl_undef_symbols()
PPCODE:
# These functions should not need changing on any platform:
void
dl_install_xsub(perl_name, symref, filename="$Package")
char * perl_name
void * symref
const char * filename
CODE:
DLDEBUG(2,PerlIO_printf(Perl_debug_log, "dl_install_xsub(name=%s, symref=%x)\n",
perl_name, symref));
ST(0) = sv_2mortal(newRV((SV*)newXS_flags(perl_name,
(void(*)(pTHX_ CV *))symref,
filename, NULL,
XS_DYNAMIC_FILENAME)));
SV *
dl_error()
CODE:
dMY_CXT;
RETVAL = newSVsv(MY_CXT.x_dl_last_error);
OUTPUT:
RETVAL
#if defined(USE_ITHREADS)
void
CLONE(...)
CODE:
MY_CXT_CLONE;
PERL_UNUSED_VAR(items);
/* MY_CXT_CLONE just does a memcpy on the whole structure, so to avoid
* using Perl variables that belong to another thread, we create our
* own for this thread.
*/
MY_CXT.x_dl_last_error = newSVpvs("");
#endif
# end.
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