freebsd-nq/contrib/perl5/ext/DynaLoader/dl_next.xs

304 lines
6.7 KiB
Plaintext
Raw Normal View History

/* dl_next.xs
*
* Platform: NeXT NS 3.2
* Author: Anno Siegel (siegel@zrz.TU-Berlin.DE)
* Based on: dl_dlopen.xs by Paul Marquess
* 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.'
*/
/* Porting notes:
dl_next.xs is itself 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 NeXTs rld_*. The xs code proper is unchanged
from Paul's original.
The port could use some streamlining. For one, error handling could
be simplified.
Anno Siegel
*/
#if NS_TARGET_MAJOR >= 4
#else
/* include these before perl headers */
#include <mach-o/rld.h>
#include <streams/streams.h>
#endif
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#define DL_LOADONCEONLY
#include "dlutils.c" /* SaveError() etc */
static char * dl_last_error = (char *) 0;
static AV *dl_resolve_using = Nullav;
static char *dlerror()
{
return dl_last_error;
}
int dlclose(handle) /* stub only */
void *handle;
{
return 0;
}
#if NS_TARGET_MAJOR >= 4
#import <mach-o/dyld.h>
enum dyldErrorSource
{
OFImage,
};
static void TranslateError
(const char *path, enum dyldErrorSource type, int number)
{
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 an 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 = form(OFIErrorStrings[index], path, number);
break;
default:
error = form("%s(%d): Totally unknown error type %d\n",
path, number, type);
break;
}
Safefree(dl_last_error);
dl_last_error = savepv(error);
}
static char *dlopen(char *path, int mode /* mode is ignored */)
{
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 error's
// not very friendly but the error recovery functionality is limited.
handle = NSLinkModule(ofile, path, TRUE);
}
return handle;
}
void *
dlsym(handle, symbol)
void *handle;
char *symbol;
{
void *addr;
if (NSIsSymbolNameDefined(symbol))
addr = NSAddressOfSymbol(NSLookupAndBindSymbol(symbol));
else
addr = NULL;
return addr;
}
#else /* NS_TARGET_MAJOR <= 3 */
static NXStream *OpenError(void)
{
return NXOpenMemory( (char *) 0, 0, NX_WRITEONLY);
}
static void TransferError(NXStream *s)
{
char *buffer;
int len, maxlen;
if ( dl_last_error ) {
Safefree(dl_last_error);
}
NXGetMemoryBuffer(s, &buffer, &len, &maxlen);
New(1097, dl_last_error, len, char);
strcpy(dl_last_error, buffer);
}
static void CloseError(NXStream *s)
{
if ( s ) {
NXCloseMemory( s, NX_FREEBUFFER);
}
}
static char *dlopen(char *path, int mode /* mode is ignored */)
{
int rld_success;
NXStream *nxerr;
I32 i, psize;
char *result;
char **p;
/* Do not load what is already loaded into this process */
if (hv_fetch(dl_loaded_files, path, strlen(path), 0))
return path;
nxerr = OpenError();
psize = AvFILL(dl_resolve_using) + 3;
p = (char **) safemalloc(psize * sizeof(char*));
p[0] = path;
for(i=1; i<psize-1; i++) {
p[i] = SvPVx(*av_fetch(dl_resolve_using, i-1, TRUE), PL_na);
}
p[psize-1] = 0;
rld_success = rld_load(nxerr, (struct mach_header **)0, p,
(const char *) 0);
safefree((char*) p);
if (rld_success) {
result = path;
/* prevent multiple loads of same file into same process */
hv_store(dl_loaded_files, path, strlen(path), &PL_sv_yes, 0);
} else {
TransferError(nxerr);
result = (char*) 0;
}
CloseError(nxerr);
return result;
}
void *
dlsym(handle, symbol)
void *handle;
char *symbol;
{
NXStream *nxerr = OpenError();
unsigned long symref = 0;
if (!rld_lookup(nxerr, form("_%s", symbol), &symref))
TransferError(nxerr);
CloseError(nxerr);
return (void*) symref;
}
#endif /* NS_TARGET_MAJOR >= 4 */
/* ----- code from dl_dlopen.xs below here ----- */
static void
dl_private_init()
{
(void)dl_generic_private_init();
dl_resolve_using = perl_get_av("DynaLoader::dl_resolve_using", 0x4);
}
MODULE = DynaLoader PACKAGE = DynaLoader
BOOT:
(void)dl_private_init();
void *
dl_load_file(filename, flags=0)
char * filename
int flags
PREINIT:
int mode = 1;
CODE:
DLDEBUG(1,PerlIO_printf(PerlIO_stderr(), "dl_load_file(%s,%x):\n", filename,flags));
if (flags & 0x01)
warn("Can't make loaded symbols global on this platform while loading %s",filename);
RETVAL = dlopen(filename, mode) ;
DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), " libref=%x\n", RETVAL));
ST(0) = sv_newmortal() ;
if (RETVAL == NULL)
SaveError("%s",dlerror()) ;
else
sv_setiv( ST(0), (IV)RETVAL);
void *
dl_find_symbol(libhandle, symbolname)
void * libhandle
char * symbolname
CODE:
#if NS_TARGET_MAJOR >= 4
symbolname = form("_%s", symbolname);
#endif
DLDEBUG(2, PerlIO_printf(PerlIO_stderr(),
"dl_find_symbol(handle=%lx, symbol=%s)\n",
(unsigned long) libhandle, symbolname));
RETVAL = dlsym(libhandle, symbolname);
DLDEBUG(2, PerlIO_printf(PerlIO_stderr(),
" symbolref = %lx\n", (unsigned long) RETVAL));
ST(0) = sv_newmortal() ;
if (RETVAL == NULL)
SaveError("%s",dlerror()) ;
else
sv_setiv( ST(0), (IV)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
char * filename
CODE:
DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "dl_install_xsub(name=%s, symref=%x)\n",
perl_name, symref));
ST(0)=sv_2mortal(newRV((SV*)newXS(perl_name, (void(*)())symref, filename)));
char *
dl_error()
CODE:
RETVAL = LastError ;
OUTPUT:
RETVAL
# end.