304 lines
6.7 KiB
Plaintext
304 lines
6.7 KiB
Plaintext
/* dl_next.xs
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*
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* Platform: NeXT NS 3.2
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* Author: Anno Siegel (siegel@zrz.TU-Berlin.DE)
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* Based on: dl_dlopen.xs by Paul Marquess
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* Created: Aug 15th, 1994
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*
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*/
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/*
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And Gandalf said: 'Many folk like to know beforehand what is to
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be set on the table; but those who have laboured to prepare the
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feast like to keep their secret; for wonder makes the words of
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praise louder.'
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*/
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/* Porting notes:
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dl_next.xs is itself a port from dl_dlopen.xs by Paul Marquess. It
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should not be used as a base for further ports though it may be used
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as an example for how dl_dlopen.xs can be ported to other platforms.
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The method used here is just to supply the sun style dlopen etc.
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functions in terms of NeXTs rld_*. The xs code proper is unchanged
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from Paul's original.
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The port could use some streamlining. For one, error handling could
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be simplified.
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Anno Siegel
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*/
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#if NS_TARGET_MAJOR >= 4
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#else
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/* include these before perl headers */
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#include <mach-o/rld.h>
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#include <streams/streams.h>
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#endif
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#include "EXTERN.h"
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#include "perl.h"
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#include "XSUB.h"
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#define DL_LOADONCEONLY
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#include "dlutils.c" /* SaveError() etc */
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static char * dl_last_error = (char *) 0;
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static AV *dl_resolve_using = Nullav;
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static char *dlerror()
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{
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return dl_last_error;
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}
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int dlclose(handle) /* stub only */
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void *handle;
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{
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return 0;
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}
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#if NS_TARGET_MAJOR >= 4
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#import <mach-o/dyld.h>
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enum dyldErrorSource
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{
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OFImage,
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};
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static void TranslateError
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(const char *path, enum dyldErrorSource type, int number)
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{
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char *error;
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unsigned int index;
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static char *OFIErrorStrings[] =
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{
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"%s(%d): Object Image Load Failure\n",
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"%s(%d): Object Image Load Success\n",
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"%s(%d): Not an recognisable object file\n",
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"%s(%d): No valid architecture\n",
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"%s(%d): Object image has an invalid format\n",
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"%s(%d): Invalid access (permissions?)\n",
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"%s(%d): Unknown error code from NSCreateObjectFileImageFromFile\n",
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};
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#define NUM_OFI_ERRORS (sizeof(OFIErrorStrings) / sizeof(OFIErrorStrings[0]))
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switch (type)
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{
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case OFImage:
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index = number;
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if (index > NUM_OFI_ERRORS - 1)
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index = NUM_OFI_ERRORS - 1;
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error = form(OFIErrorStrings[index], path, number);
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break;
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default:
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error = form("%s(%d): Totally unknown error type %d\n",
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path, number, type);
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break;
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}
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Safefree(dl_last_error);
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dl_last_error = savepv(error);
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}
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static char *dlopen(char *path, int mode /* mode is ignored */)
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{
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int dyld_result;
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NSObjectFileImage ofile;
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NSModule handle = NULL;
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dyld_result = NSCreateObjectFileImageFromFile(path, &ofile);
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if (dyld_result != NSObjectFileImageSuccess)
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TranslateError(path, OFImage, dyld_result);
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else
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{
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// NSLinkModule will cause the run to abort on any link error's
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// not very friendly but the error recovery functionality is limited.
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handle = NSLinkModule(ofile, path, TRUE);
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}
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return handle;
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}
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void *
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dlsym(handle, symbol)
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void *handle;
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char *symbol;
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{
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void *addr;
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if (NSIsSymbolNameDefined(symbol))
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addr = NSAddressOfSymbol(NSLookupAndBindSymbol(symbol));
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else
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addr = NULL;
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return addr;
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}
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#else /* NS_TARGET_MAJOR <= 3 */
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static NXStream *OpenError(void)
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{
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return NXOpenMemory( (char *) 0, 0, NX_WRITEONLY);
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}
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static void TransferError(NXStream *s)
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{
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char *buffer;
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int len, maxlen;
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if ( dl_last_error ) {
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Safefree(dl_last_error);
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}
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NXGetMemoryBuffer(s, &buffer, &len, &maxlen);
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New(1097, dl_last_error, len, char);
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strcpy(dl_last_error, buffer);
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}
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static void CloseError(NXStream *s)
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{
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if ( s ) {
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NXCloseMemory( s, NX_FREEBUFFER);
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}
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}
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static char *dlopen(char *path, int mode /* mode is ignored */)
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{
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int rld_success;
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NXStream *nxerr;
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I32 i, psize;
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char *result;
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char **p;
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/* Do not load what is already loaded into this process */
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if (hv_fetch(dl_loaded_files, path, strlen(path), 0))
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return path;
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nxerr = OpenError();
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psize = AvFILL(dl_resolve_using) + 3;
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p = (char **) safemalloc(psize * sizeof(char*));
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p[0] = path;
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for(i=1; i<psize-1; i++) {
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p[i] = SvPVx(*av_fetch(dl_resolve_using, i-1, TRUE), PL_na);
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}
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p[psize-1] = 0;
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rld_success = rld_load(nxerr, (struct mach_header **)0, p,
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(const char *) 0);
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safefree((char*) p);
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if (rld_success) {
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result = path;
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/* prevent multiple loads of same file into same process */
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hv_store(dl_loaded_files, path, strlen(path), &PL_sv_yes, 0);
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} else {
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TransferError(nxerr);
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result = (char*) 0;
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}
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CloseError(nxerr);
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return result;
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}
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void *
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dlsym(handle, symbol)
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void *handle;
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char *symbol;
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{
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NXStream *nxerr = OpenError();
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unsigned long symref = 0;
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if (!rld_lookup(nxerr, form("_%s", symbol), &symref))
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TransferError(nxerr);
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CloseError(nxerr);
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return (void*) symref;
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}
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#endif /* NS_TARGET_MAJOR >= 4 */
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/* ----- code from dl_dlopen.xs below here ----- */
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static void
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dl_private_init()
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{
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(void)dl_generic_private_init();
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dl_resolve_using = perl_get_av("DynaLoader::dl_resolve_using", 0x4);
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}
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MODULE = DynaLoader PACKAGE = DynaLoader
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BOOT:
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(void)dl_private_init();
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void *
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dl_load_file(filename, flags=0)
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char * filename
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int flags
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PREINIT:
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int mode = 1;
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CODE:
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DLDEBUG(1,PerlIO_printf(PerlIO_stderr(), "dl_load_file(%s,%x):\n", filename,flags));
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if (flags & 0x01)
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warn("Can't make loaded symbols global on this platform while loading %s",filename);
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RETVAL = dlopen(filename, mode) ;
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DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), " libref=%x\n", RETVAL));
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ST(0) = sv_newmortal() ;
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if (RETVAL == NULL)
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SaveError("%s",dlerror()) ;
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else
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sv_setiv( ST(0), (IV)RETVAL);
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void *
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dl_find_symbol(libhandle, symbolname)
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void * libhandle
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char * symbolname
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CODE:
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#if NS_TARGET_MAJOR >= 4
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symbolname = form("_%s", symbolname);
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#endif
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DLDEBUG(2, PerlIO_printf(PerlIO_stderr(),
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"dl_find_symbol(handle=%lx, symbol=%s)\n",
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(unsigned long) libhandle, symbolname));
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RETVAL = dlsym(libhandle, symbolname);
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DLDEBUG(2, PerlIO_printf(PerlIO_stderr(),
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" symbolref = %lx\n", (unsigned long) RETVAL));
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ST(0) = sv_newmortal() ;
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if (RETVAL == NULL)
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SaveError("%s",dlerror()) ;
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else
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sv_setiv( ST(0), (IV)RETVAL);
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void
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dl_undef_symbols()
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PPCODE:
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# These functions should not need changing on any platform:
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void
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dl_install_xsub(perl_name, symref, filename="$Package")
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char * perl_name
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void * symref
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char * filename
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CODE:
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DLDEBUG(2,PerlIO_printf(PerlIO_stderr(), "dl_install_xsub(name=%s, symref=%x)\n",
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perl_name, symref));
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ST(0)=sv_2mortal(newRV((SV*)newXS(perl_name, (void(*)())symref, filename)));
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char *
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dl_error()
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CODE:
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RETVAL = LastError ;
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OUTPUT:
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RETVAL
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# end.
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