Mercurial > cpython-lru_cache-weakref

annotate Python/dynload_next.c @ 24866:f0dbd5b49d8a legacy-trunk

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Streamline the fast track for CFunction calls a bit more: there was nothing special done if keyword arguments were present, so test for that earlier and fall through to the normal case if there are any. This ought to slow down CFunction calls with keyword args, but I don't care; it's a tiny (1%) improvement for pystone.
author Guido van Rossum <guido@python.org>
date Fri, 16 Aug 2002 16:14:00 +0000
parents 794fe37ca5f4
children 6b31b26e418d
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1
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2 /* Support for dynamic loading of extension modules on Mac OS X
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3 ** All references to "NeXT" are for historical reasons.
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4 */
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5
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6 #include "Python.h"
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7 #include "importdl.h"
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8
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9 #include <mach-o/dyld.h>
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10
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11 const struct filedescr _PyImport_DynLoadFiletab[] = {
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12 {".so", "rb", C_EXTENSION},
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13 {"module.so", "rb", C_EXTENSION},
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14 {0, 0}
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15 };
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16
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17 /*
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18 ** Python modules are Mach-O MH_BUNDLE files. The best way to load these
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19 ** is each in a private namespace, so you can load, say, a module bar and a
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20 ** module foo.bar. If we load everything in the global namespace the two
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21 ** initbar() symbols will conflict.
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22 ** However, it seems some extension packages depend upon being able to access
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23 ** each others' global symbols. There seems to be no way to eat our cake and
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24 ** have it, so the USE_DYLD_GLOBAL_NAMESPACE define determines which behaviour
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25 ** you get.
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26 */
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27
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28 #ifdef USE_DYLD_GLOBAL_NAMESPACE
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29 #define LINKOPTIONS NSLINKMODULE_OPTION_BINDNOW|NSLINKMODULE_OPTION_RETURN_ON_ERROR
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30 #else
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31 #define LINKOPTIONS NSLINKMODULE_OPTION_BINDNOW| \
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32 NSLINKMODULE_OPTION_RETURN_ON_ERROR|NSLINKMODULE_OPTION_PRIVATE
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33 #endif
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34 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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35 const char *pathname, FILE *fp)
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36 {
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37 dl_funcptr p = NULL;
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38 char funcname[258];
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39 NSObjectFileImageReturnCode rc;
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40 NSObjectFileImage image;
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41 NSModule newModule;
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42 NSSymbol theSym;
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43 const char *errString;
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44 char errBuf[512];
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45
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46 PyOS_snprintf(funcname, sizeof(funcname), "_init%.200s", shortname);
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47
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48 #ifdef USE_DYLD_GLOBAL_NAMESPACE
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49 if (NSIsSymbolNameDefined(funcname)) {
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50 theSym = NSLookupAndBindSymbol(funcname);
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51 p = (dl_funcptr)NSAddressOfSymbol(theSym);
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52 return p;
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53 }
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54 #endif
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55 rc = NSCreateObjectFileImageFromFile(pathname, &image);
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56 switch(rc) {
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57 default:
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58 case NSObjectFileImageFailure:
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59 case NSObjectFileImageFormat:
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60 /* for these a message is printed on stderr by dyld */
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61 errString = "Can't create object file image";
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62 break;
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63 case NSObjectFileImageSuccess:
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64 errString = NULL;
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65 break;
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66 case NSObjectFileImageInappropriateFile:
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67 errString = "Inappropriate file type for dynamic loading";
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68 break;
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69 case NSObjectFileImageArch:
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70 errString = "Wrong CPU type in object file";
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71 break;
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72 case NSObjectFileImageAccess:
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73 errString = "Can't read object file (no access)";
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74 break;
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75 }
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76 if (errString == NULL) {
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77 newModule = NSLinkModule(image, pathname, LINKOPTIONS);
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78 if (newModule == NULL) {
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79 int errNo;
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80 char *fileName, *moreErrorStr;
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81 NSLinkEditErrors c;
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82 NSLinkEditError( &c, &errNo, &fileName, &moreErrorStr );
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83 PyOS_snprintf(errBuf, 512, "Failure linking new module: %s: %s",
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84 fileName, moreErrorStr);
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85 errString = errBuf;
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86 }
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87 }
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88 if (errString != NULL) {
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89 PyErr_SetString(PyExc_ImportError, errString);
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90 return NULL;
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91 }
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92 #ifdef USE_DYLD_GLOBAL_NAMESPACE
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93 if (!NSIsSymbolNameDefined(funcname)) {
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94 /* UnlinkModule() isn't implemented in current versions, but calling it does no harm */
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95 NSUnLinkModule(newModule, FALSE);
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96 PyErr_Format(PyExc_ImportError,
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97 "Loaded module does not contain symbol %.200s",
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98 funcname);
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99 return NULL;
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100 }
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101 theSym = NSLookupAndBindSymbol(funcname);
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102 #else
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103 theSym = NSLookupSymbolInModule(newModule, funcname);
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104 if ( theSym == NULL ) {
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105 NSUnLinkModule(newModule, FALSE);
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106 PyErr_Format(PyExc_ImportError,
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107 "Loaded module does not contain symbol %.200s",
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108 funcname);
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109 return NULL;
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110 }
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111 #endif
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112 p = (dl_funcptr)NSAddressOfSymbol(theSym);
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113 return p;
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114 }