Guido van Rossum | 22a1d36 | 1999-12-20 21:18:49 +0000 | [diff] [blame^] | 1 | /*********************************************************** |
| 2 | Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam, |
| 3 | The Netherlands. |
| 4 | |
| 5 | All Rights Reserved |
| 6 | |
| 7 | Permission to use, copy, modify, and distribute this software and its |
| 8 | documentation for any purpose and without fee is hereby granted, |
| 9 | provided that the above copyright notice appear in all copies and that |
| 10 | both that copyright notice and this permission notice appear in |
| 11 | supporting documentation, and that the names of Stichting Mathematisch |
| 12 | Centrum or CWI or Corporation for National Research Initiatives or |
| 13 | CNRI not be used in advertising or publicity pertaining to |
| 14 | distribution of the software without specific, written prior |
| 15 | permission. |
| 16 | |
| 17 | While CWI is the initial source for this software, a modified version |
| 18 | is made available by the Corporation for National Research Initiatives |
| 19 | (CNRI) at the Internet address ftp://ftp.python.org. |
| 20 | |
| 21 | STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH |
| 22 | REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF |
| 23 | MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH |
| 24 | CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL |
| 25 | DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| 26 | PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| 27 | TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| 28 | PERFORMANCE OF THIS SOFTWARE. |
| 29 | |
| 30 | ******************************************************************/ |
| 31 | |
| 32 | /* Support for dynamic loading of extension modules */ |
| 33 | |
| 34 | #include "Python.h" |
| 35 | #include "importdl.h" |
| 36 | |
| 37 | |
| 38 | #ifdef WITH_DYLD |
| 39 | |
| 40 | #define USE_DYLD |
| 41 | |
| 42 | #include <mach-o/dyld.h> |
| 43 | |
| 44 | #else /* WITH_DYLD */ |
| 45 | |
| 46 | #define USE_RLD |
| 47 | /* Define this to 1 if you want be able to load ObjC modules as well: |
| 48 | it switches between two different way of loading modules on the NeXT, |
| 49 | one that directly interfaces with the dynamic loader (rld_load(), which |
| 50 | does not correctly load ObjC object files), and another that uses the |
| 51 | ObjC runtime (objc_loadModules()) to do the job. |
| 52 | You'll have to add ``-ObjC'' to the compiler flags if you set this to 1. |
| 53 | */ |
| 54 | #define HANDLE_OBJC_MODULES 1 |
| 55 | #if HANDLE_OBJC_MODULES |
| 56 | #include <objc/Object.h> |
| 57 | #include <objc/objc-load.h> |
| 58 | #endif |
| 59 | |
| 60 | #include <mach-o/rld.h> |
| 61 | |
| 62 | #endif /* WITH_DYLD */ |
| 63 | |
| 64 | |
| 65 | const struct filedescr _PyImport_DynLoadFiletab[] = { |
| 66 | {".so", "rb", C_EXTENSION}, |
| 67 | {"module.so", "rb", C_EXTENSION}, |
| 68 | {0, 0} |
| 69 | }; |
| 70 | |
| 71 | dl_funcptr _PyImport_GetDynLoadFunc(const char *name, const char *funcname, |
| 72 | const char *pathname, FILE *fp) |
| 73 | { |
| 74 | dl_funcptr p = NULL; |
| 75 | |
| 76 | #ifdef USE_RLD |
| 77 | { |
| 78 | NXStream *errorStream; |
| 79 | struct mach_header *new_header; |
| 80 | const char *filenames[2]; |
| 81 | long ret; |
| 82 | unsigned long ptr; |
| 83 | |
| 84 | errorStream = NXOpenMemory(NULL, 0, NX_WRITEONLY); |
| 85 | filenames[0] = pathname; |
| 86 | filenames[1] = NULL; |
| 87 | |
| 88 | #if HANDLE_OBJC_MODULES |
| 89 | |
| 90 | /* The following very bogus line of code ensures that |
| 91 | objc_msgSend, etc are linked into the binary. Without |
| 92 | it, dynamic loading of a module that includes objective-c |
| 93 | method calls will fail with "undefined symbol _objc_msgSend()". |
| 94 | This remains true even in the presence of the -ObjC flag |
| 95 | to the compiler |
| 96 | */ |
| 97 | |
| 98 | [Object name]; |
| 99 | |
| 100 | /* objc_loadModules() dynamically loads the object files |
| 101 | indicated by the paths in filenames. If there are any |
| 102 | errors generated during loading -- typically due to the |
| 103 | inability to find particular symbols -- an error message |
| 104 | will be written to errorStream. |
| 105 | It returns 0 if the module is successfully loaded, 1 |
| 106 | otherwise. |
| 107 | */ |
| 108 | |
| 109 | ret = !objc_loadModules(filenames, errorStream, |
| 110 | NULL, &new_header, NULL); |
| 111 | |
| 112 | #else /* !HANDLE_OBJC_MODULES */ |
| 113 | |
| 114 | ret = rld_load(errorStream, &new_header, |
| 115 | filenames, NULL); |
| 116 | |
| 117 | #endif /* HANDLE_OBJC_MODULES */ |
| 118 | |
| 119 | /* extract the error messages for the exception */ |
| 120 | if(!ret) { |
| 121 | char *streamBuf; |
| 122 | int len, maxLen; |
| 123 | |
| 124 | NXPutc(errorStream, (char)0); |
| 125 | |
| 126 | NXGetMemoryBuffer(errorStream, |
| 127 | &streamBuf, &len, &maxLen); |
| 128 | PyErr_SetString(PyExc_ImportError, streamBuf); |
| 129 | } |
| 130 | |
| 131 | if(ret && rld_lookup(errorStream, funcname, &ptr)) |
| 132 | p = (dl_funcptr) ptr; |
| 133 | |
| 134 | NXCloseMemory(errorStream, NX_FREEBUFFER); |
| 135 | |
| 136 | if(!ret) |
| 137 | return NULL; |
| 138 | } |
| 139 | #endif /* USE_RLD */ |
| 140 | #ifdef USE_DYLD |
| 141 | /* This is also NeXT-specific. However, frameworks (the new style |
| 142 | of shared library) and rld() can't be used in the same program; |
| 143 | instead, you have to use dyld, which is mostly unimplemented. */ |
| 144 | { |
| 145 | NSObjectFileImageReturnCode rc; |
| 146 | NSObjectFileImage image; |
| 147 | NSModule newModule; |
| 148 | NSSymbol theSym; |
| 149 | void *symaddr; |
| 150 | const char *errString; |
| 151 | |
| 152 | rc = NSCreateObjectFileImageFromFile(pathname, &image); |
| 153 | switch(rc) { |
| 154 | default: |
| 155 | case NSObjectFileImageFailure: |
| 156 | NSObjectFileImageFormat: |
| 157 | /* for these a message is printed on stderr by dyld */ |
| 158 | errString = "Can't create object file image"; |
| 159 | break; |
| 160 | case NSObjectFileImageSuccess: |
| 161 | errString = NULL; |
| 162 | break; |
| 163 | case NSObjectFileImageInappropriateFile: |
| 164 | errString = "Inappropriate file type for dynamic loading"; |
| 165 | break; |
| 166 | case NSObjectFileImageArch: |
| 167 | errString = "Wrong CPU type in object file"; |
| 168 | break; |
| 169 | NSObjectFileImageAccess: |
| 170 | errString = "Can't read object file (no access)"; |
| 171 | break; |
| 172 | } |
| 173 | if (errString == NULL) { |
| 174 | newModule = NSLinkModule(image, pathname, TRUE); |
| 175 | if (!newModule) |
| 176 | errString = "Failure linking new module"; |
| 177 | } |
| 178 | if (errString != NULL) { |
| 179 | PyErr_SetString(PyExc_ImportError, errString); |
| 180 | return NULL; |
| 181 | } |
| 182 | if (!NSIsSymbolNameDefined(funcname)) { |
| 183 | /* UnlinkModule() isn't implimented in current versions, but calling it does no harm */ |
| 184 | NSUnLinkModule(newModule, FALSE); |
| 185 | PyErr_Format(PyExc_ImportError, "Loaded module does not contain symbol %s", funcname); |
| 186 | return NULL; |
| 187 | } |
| 188 | theSym = NSLookupAndBindSymbol(funcname); |
| 189 | p = (dl_funcptr)NSAddressOfSymbol(theSym); |
| 190 | } |
| 191 | #endif /* USE_DYLD */ |
| 192 | |
| 193 | return p; |
| 194 | } |