| 1 | /* dl_dyld.xs |
| 2 | * |
| 3 | * Platform: Darwin (Mac OS) |
| 4 | * Author: Wilfredo Sanchez <wsanchez@apple.com> |
| 5 | * Based on: dl_next.xs by Paul Marquess |
| 6 | * Based on: dl_dlopen.xs by Anno Siegel |
| 7 | * Created: Aug 15th, 1994 |
| 8 | * |
| 9 | */ |
| 10 | |
| 11 | /* |
| 12 | * And Gandalf said: 'Many folk like to know beforehand what is to |
| 13 | * be set on the table; but those who have laboured to prepare the |
| 14 | * feast like to keep their secret; for wonder makes the words of |
| 15 | * praise louder.' |
| 16 | * |
| 17 | * [p.970 of _The Lord of the Rings_, VI/v: "The Steward and the King"] |
| 18 | */ |
| 19 | |
| 20 | /* Porting notes: |
| 21 | |
| 22 | dl_dyld.xs is based on dl_next.xs by Anno Siegel. |
| 23 | |
| 24 | dl_next.xs is in turn a port from dl_dlopen.xs by Paul Marquess. It |
| 25 | should not be used as a base for further ports though it may be used |
| 26 | as an example for how dl_dlopen.xs can be ported to other platforms. |
| 27 | |
| 28 | The method used here is just to supply the sun style dlopen etc. |
| 29 | functions in terms of NeXT's/Apple's dyld. The xs code proper is |
| 30 | unchanged from Paul's original. |
| 31 | |
| 32 | The port could use some streamlining. For one, error handling could |
| 33 | be simplified. |
| 34 | |
| 35 | This should be useable as a replacement for dl_next.xs, but it has not |
| 36 | been tested on NeXT platforms. |
| 37 | |
| 38 | Wilfredo Sanchez |
| 39 | |
| 40 | */ |
| 41 | |
| 42 | #define PERL_EXT |
| 43 | #include "EXTERN.h" |
| 44 | #define PERL_IN_DL_DYLD_XS |
| 45 | #include "perl.h" |
| 46 | #include "XSUB.h" |
| 47 | |
| 48 | #include "dlutils.c" /* for SaveError() etc */ |
| 49 | |
| 50 | #undef environ |
| 51 | #undef bool |
| 52 | #import <mach-o/dyld.h> |
| 53 | |
| 54 | static char *dlerror() |
| 55 | { |
| 56 | dTHX; |
| 57 | dMY_CXT; |
| 58 | return dl_last_error; |
| 59 | } |
| 60 | |
| 61 | static int dlclose(void *handle) /* stub only */ |
| 62 | { |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | enum dyldErrorSource |
| 67 | { |
| 68 | OFImage, |
| 69 | }; |
| 70 | |
| 71 | static void TranslateError |
| 72 | (const char *path, enum dyldErrorSource type, int number) |
| 73 | { |
| 74 | dTHX; |
| 75 | dMY_CXT; |
| 76 | char *error; |
| 77 | unsigned int index; |
| 78 | static char *OFIErrorStrings[] = |
| 79 | { |
| 80 | "%s(%d): Object Image Load Failure\n", |
| 81 | "%s(%d): Object Image Load Success\n", |
| 82 | "%s(%d): Not a recognisable object file\n", |
| 83 | "%s(%d): No valid architecture\n", |
| 84 | "%s(%d): Object image has an invalid format\n", |
| 85 | "%s(%d): Invalid access (permissions?)\n", |
| 86 | "%s(%d): Unknown error code from NSCreateObjectFileImageFromFile\n", |
| 87 | }; |
| 88 | #define NUM_OFI_ERRORS (sizeof(OFIErrorStrings) / sizeof(OFIErrorStrings[0])) |
| 89 | |
| 90 | switch (type) |
| 91 | { |
| 92 | case OFImage: |
| 93 | index = number; |
| 94 | if (index > NUM_OFI_ERRORS - 1) |
| 95 | index = NUM_OFI_ERRORS - 1; |
| 96 | error = Perl_form_nocontext(OFIErrorStrings[index], path, number); |
| 97 | break; |
| 98 | |
| 99 | default: |
| 100 | error = Perl_form_nocontext("%s(%d): Totally unknown error type %d\n", |
| 101 | path, number, type); |
| 102 | break; |
| 103 | } |
| 104 | sv_setpv(MY_CXT.x_dl_last_error, error); |
| 105 | } |
| 106 | |
| 107 | static char *dlopen(char *path, int mode /* mode is ignored */) |
| 108 | { |
| 109 | int dyld_result; |
| 110 | NSObjectFileImage ofile; |
| 111 | NSModule handle = NULL; |
| 112 | |
| 113 | dyld_result = NSCreateObjectFileImageFromFile(path, &ofile); |
| 114 | if (dyld_result != NSObjectFileImageSuccess) |
| 115 | TranslateError(path, OFImage, dyld_result); |
| 116 | else |
| 117 | { |
| 118 | // NSLinkModule will cause the run to abort on any link errors |
| 119 | // not very friendly but the error recovery functionality is limited. |
| 120 | handle = NSLinkModule(ofile, path, TRUE); |
| 121 | NSDestroyObjectFileImage(ofile); |
| 122 | } |
| 123 | |
| 124 | return handle; |
| 125 | } |
| 126 | |
| 127 | static void * |
| 128 | dlsym(void *handle, char *symbol) |
| 129 | { |
| 130 | void *addr; |
| 131 | |
| 132 | if (NSIsSymbolNameDefined(symbol)) |
| 133 | addr = NSAddressOfSymbol(NSLookupAndBindSymbol(symbol)); |
| 134 | else |
| 135 | addr = NULL; |
| 136 | |
| 137 | return addr; |
| 138 | } |
| 139 | |
| 140 | |
| 141 | |
| 142 | /* ----- code from dl_dlopen.xs below here ----- */ |
| 143 | |
| 144 | |
| 145 | static void |
| 146 | dl_private_init(pTHX) |
| 147 | { |
| 148 | (void)dl_generic_private_init(aTHX); |
| 149 | } |
| 150 | |
| 151 | MODULE = DynaLoader PACKAGE = DynaLoader |
| 152 | |
| 153 | BOOT: |
| 154 | (void)dl_private_init(aTHX); |
| 155 | |
| 156 | |
| 157 | |
| 158 | void * |
| 159 | dl_load_file(filename, flags=0) |
| 160 | char * filename |
| 161 | int flags |
| 162 | PREINIT: |
| 163 | int mode = 1; |
| 164 | CODE: |
| 165 | DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_load_file(%s,%x):\n", filename,flags)); |
| 166 | if (flags & 0x01) |
| 167 | Perl_warn(aTHX_ "Can't make loaded symbols global on this platform while loading %s",filename); |
| 168 | RETVAL = dlopen(filename, mode) ; |
| 169 | DLDEBUG(2,PerlIO_printf(Perl_debug_log, " libref=%x\n", RETVAL)); |
| 170 | ST(0) = sv_newmortal() ; |
| 171 | if (RETVAL == NULL) |
| 172 | SaveError(aTHX_ "%s",dlerror()) ; |
| 173 | else |
| 174 | sv_setiv( ST(0), PTR2IV(RETVAL) ); |
| 175 | |
| 176 | |
| 177 | void * |
| 178 | dl_find_symbol(libhandle, symbolname, ign_err=0) |
| 179 | void * libhandle |
| 180 | char * symbolname |
| 181 | int ign_err |
| 182 | CODE: |
| 183 | symbolname = Perl_form_nocontext("_%s", symbolname); |
| 184 | DLDEBUG(2, PerlIO_printf(Perl_debug_log, |
| 185 | "dl_find_symbol(handle=%lx, symbol=%s)\n", |
| 186 | (unsigned long) libhandle, symbolname)); |
| 187 | RETVAL = dlsym(libhandle, symbolname); |
| 188 | DLDEBUG(2, PerlIO_printf(Perl_debug_log, |
| 189 | " symbolref = %lx\n", (unsigned long) RETVAL)); |
| 190 | ST(0) = sv_newmortal() ; |
| 191 | if (RETVAL == NULL) { |
| 192 | if (!ign_err) |
| 193 | SaveError(aTHX_ "%s",dlerror()) ; |
| 194 | } else |
| 195 | sv_setiv( ST(0), PTR2IV(RETVAL) ); |
| 196 | |
| 197 | |
| 198 | void |
| 199 | dl_undef_symbols() |
| 200 | PPCODE: |
| 201 | |
| 202 | |
| 203 | |
| 204 | # These functions should not need changing on any platform: |
| 205 | |
| 206 | void |
| 207 | dl_install_xsub(perl_name, symref, filename="$Package") |
| 208 | char * perl_name |
| 209 | void * symref |
| 210 | const char * filename |
| 211 | CODE: |
| 212 | DLDEBUG(2,PerlIO_printf(Perl_debug_log, "dl_install_xsub(name=%s, symref=%x)\n", |
| 213 | perl_name, symref)); |
| 214 | ST(0) = sv_2mortal(newRV((SV*)newXS_flags(perl_name, |
| 215 | (void(*)(pTHX_ CV *))symref, |
| 216 | filename, NULL, |
| 217 | XS_DYNAMIC_FILENAME))); |
| 218 | |
| 219 | |
| 220 | SV * |
| 221 | dl_error() |
| 222 | CODE: |
| 223 | dMY_CXT; |
| 224 | RETVAL = newSVsv(MY_CXT.x_dl_last_error); |
| 225 | OUTPUT: |
| 226 | RETVAL |
| 227 | |
| 228 | #if defined(USE_ITHREADS) |
| 229 | |
| 230 | void |
| 231 | CLONE(...) |
| 232 | CODE: |
| 233 | MY_CXT_CLONE; |
| 234 | |
| 235 | PERL_UNUSED_VAR(items); |
| 236 | |
| 237 | /* MY_CXT_CLONE just does a memcpy on the whole structure, so to avoid |
| 238 | * using Perl variables that belong to another thread, we create our |
| 239 | * own for this thread. |
| 240 | */ |
| 241 | MY_CXT.x_dl_last_error = newSVpvs(""); |
| 242 | |
| 243 | #endif |
| 244 | |
| 245 | # end. |