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