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By default every module is imported in its own namespace, but this can be changed by defining USE_DYLD_GLOBAL_NAMESPACE. In a future version this define will be replaced by a runtime setting, but that needs a bit more thought. This code is largely based on code and feedback from Steven Majewski, Marcel Prastawa, Manoj Plakal and other on pythonmac-sig.
119 lines
3.4 KiB
C
119 lines
3.4 KiB
C
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/* Support for dynamic loading of extension modules on Mac OS X
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** All references to "NeXT" are for historical reasons.
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*/
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#include "Python.h"
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#include "importdl.h"
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#include <mach-o/dyld.h>
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const struct filedescr _PyImport_DynLoadFiletab[] = {
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{".so", "rb", C_EXTENSION},
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{"module.so", "rb", C_EXTENSION},
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{0, 0}
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};
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/*
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** Python modules are Mach-O MH_BUNDLE files. The best way to load these
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** is each in a private namespace, so you can load, say, a module bar and a
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** module foo.bar. If we load everything in the global namespace the two
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** initbar() symbols will conflict.
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** However, it seems some extension packages depend upon being able to access
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** each others' global symbols. There seems to be no way to eat our cake and
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** have it, so the USE_DYLD_GLOBAL_NAMESPACE define determines which behaviour
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** you get.
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*/
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#ifdef USE_DYLD_GLOBAL_NAMESPACE
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#define LINKOPTIONS NSLINKMODULE_OPTION_BINDNOW|NSLINKMODULE_OPTION_RETURN_ON_ERROR
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#else
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#define LINKOPTIONS NSLINKMODULE_OPTION_BINDNOW| \
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NSLINKMODULE_OPTION_RETURN_ON_ERROR|NSLINKMODULE_OPTION_PRIVATE
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#endif
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dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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const char *pathname, FILE *fp)
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{
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dl_funcptr p = NULL;
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char funcname[258];
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PyOS_snprintf(funcname, sizeof(funcname), "_init%.200s", shortname);
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{
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NSObjectFileImageReturnCode rc;
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NSObjectFileImage image;
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NSModule newModule;
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NSSymbol theSym;
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const char *errString;
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char errBuf[512];
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#ifdef USE_DYLD_GLOBAL_NAMESPACE
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if (NSIsSymbolNameDefined(funcname)) {
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theSym = NSLookupAndBindSymbol(funcname);
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p = (dl_funcptr)NSAddressOfSymbol(theSym);
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return p;
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}
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#endif
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rc = NSCreateObjectFileImageFromFile(pathname, &image);
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switch(rc) {
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default:
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case NSObjectFileImageFailure:
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case NSObjectFileImageFormat:
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/* for these a message is printed on stderr by dyld */
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errString = "Can't create object file image";
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break;
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case NSObjectFileImageSuccess:
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errString = NULL;
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break;
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case NSObjectFileImageInappropriateFile:
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errString = "Inappropriate file type for dynamic loading";
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break;
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case NSObjectFileImageArch:
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errString = "Wrong CPU type in object file";
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break;
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case NSObjectFileImageAccess:
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errString = "Can't read object file (no access)";
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break;
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}
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if (errString == NULL) {
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newModule = NSLinkModule(image, pathname, LINKOPTIONS);
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if (newModule == NULL) {
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int errNo;
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char *fileName, *moreErrorStr;
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NSLinkEditErrors c;
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NSLinkEditError( &c, &errNo, &fileName, &moreErrorStr );
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PyOS_snprintf(errBuf, 512, "Failure linking new module: %s: %s",
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fileName, moreErrorStr);
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errString = errBuf;
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}
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}
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if (errString != NULL) {
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PyErr_SetString(PyExc_ImportError, errString);
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return NULL;
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}
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#ifdef USE_DYLD_GLOBAL_NAMESPACE
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if (!NSIsSymbolNameDefined(funcname)) {
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/* UnlinkModule() isn't implemented in current versions, but calling it does no harm */
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NSUnLinkModule(newModule, FALSE);
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PyErr_Format(PyExc_ImportError,
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"Loaded module does not contain symbol %.200s",
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funcname);
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return NULL;
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}
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theSym = NSLookupAndBindSymbol(funcname);
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#else
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theSym = NSLookupSymbolInModule(newModule, funcname);
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if ( theSym == NULL ) {
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NSUnLinkModule(newModule, FALSE);
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PyErr_Format(PyExc_ImportError,
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"Loaded module does not contain symbol %.200s",
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funcname);
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return NULL;
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}
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#endif
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p = (dl_funcptr)NSAddressOfSymbol(theSym);
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}
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return p;
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}
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