Mercurial > cpython-lru_cache-weakref

annotate Python/dynload_mac.c @ 24155:9456a2ccda61 legacy-trunk

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The Py_REF_DEBUG/COUNT_ALLOCS/Py_TRACE_REFS macro minefield: added more trivial lexical helper macros so that uses of these guys expand to nothing at all when they're not enabled. This should help sub- standard compilers that can't do a good job of optimizing away the previous "(void)0" expressions. Py_DECREF: There's only one definition of this now. Yay! That was that last one in the family defined multiple times in an #ifdef maze. Py_FatalError(): Changed the char* signature to const char*. _Py_NegativeRefcount(): New helper function for the Py_REF_DEBUG expansion of Py_DECREF. Calling an external function cuts down on the volume of generated code. The previous inline expansion of abort() didn't work as intended on Windows (the program often kept going, and the error msg scrolled off the screen unseen). _Py_NegativeRefcount calls Py_FatalError instead, which captures our best knowledge of how to abort effectively across platforms.
author Tim Peters <tim.peters@gmail.com>
date Tue, 09 Jul 2002 02:57:01 +0000
parents 379fc66f4c96
children ed28b9752f8d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 /* Support for dynamic loading of extension modules */
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3
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4 #include "Python.h"
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5 #include "importdl.h"
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6
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7 #include <Aliases.h>
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8 #include <CodeFragments.h>
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9 #ifdef USE_GUSI1
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10 #include "TFileSpec.h" /* for Path2FSSpec() */
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11 #endif
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12 #include <Files.h>
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13 #include <TextUtils.h>
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14 #include "macdefs.h"
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15 #include "macglue.h"
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16
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17
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18 const struct filedescr _PyImport_DynLoadFiletab[] = {
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19 {".slb", "rb", C_EXTENSION},
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20 #ifdef __CFM68K__
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21 {".CFM68K.slb", "rb", C_EXTENSION},
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22 #else
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23 #if TARGET_API_MAC_CARBON
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24 {".carbon.slb", "rb", C_EXTENSION},
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25 #else
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26 {".ppc.slb", "rb", C_EXTENSION},
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27 #endif
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28 #endif
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29 {0, 0}
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30 };
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31
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32
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33 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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34 const char *pathname, FILE *fp)
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35 {
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36 dl_funcptr p;
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37 char funcname[258];
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38
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39 /*
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40 ** Dynamic loading of CFM shared libraries on the Mac. The
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41 ** code has become more convoluted than it was, because we
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42 ** want to be able to put multiple modules in a single
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43 ** file. For this reason, we have to determine the fragment
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44 ** name, and we cannot use the library entry point but we have
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45 ** to locate the correct init routine "by hand".
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46 */
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47 FSSpec libspec;
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48 CFragConnectionID connID;
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49 Ptr mainAddr;
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50 Str255 errMessage;
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51 OSErr err;
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52 #ifndef USE_GUSI1
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53 Boolean isfolder, didsomething;
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54 #endif
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55 char buf[512];
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56 Str63 fragname;
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57 Ptr symAddr;
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58 CFragSymbolClass class;
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59
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60 /* First resolve any aliases to find the real file */
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61 #ifdef USE_GUSI1
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62 err = Path2FSSpec(pathname, &libspec);
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63 #else
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64 c2pstrcpy((unsigned char *)buf, pathname);
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65 (void)FSMakeFSSpec(0, 0, (unsigned char *)buf, &libspec);
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66 err = ResolveAliasFile(&libspec, 1, &isfolder, &didsomething);
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67 #endif
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68 if ( err ) {
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69 PyOS_snprintf(buf, sizeof(buf),
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70 "%.200s: %.200s", pathname, PyMac_StrError(err));
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71 PyErr_SetString(PyExc_ImportError, buf);
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72 return NULL;
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73 }
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74 /* Next, determine the fragment name,
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75 by stripping '.slb' and 'module' */
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76 memcpy(fragname+1, libspec.name+1, libspec.name[0]);
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77 fragname[0] = libspec.name[0];
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78 if( strncmp((char *)(fragname+1+fragname[0]-4),
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79 ".slb", 4) == 0 )
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80 fragname[0] -= 4;
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81 if ( strncmp((char *)(fragname+1+fragname[0]-6),
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82 "module", 6) == 0 )
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83 fragname[0] -= 6;
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84 /* Load the fragment
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85 (or return the connID if it is already loaded */
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86 err = GetDiskFragment(&libspec, 0, 0, fragname,
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87 kLoadCFrag, &connID, &mainAddr,
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88 errMessage);
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89 if ( err == cfragImportTooOldErr || err == cfragImportTooNewErr ) {
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90 /*
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91 ** Special-case code: if PythonCore is too old or too new this means
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92 ** the dynamic module was meant for a different Python.
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93 */
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94 if (errMessage[0] == 10 && strncmp((char *)errMessage+1, "PythonCore", 10) == 0 ) {
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95 PyOS_snprintf(buf, sizeof(buf),
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96 "Dynamic module was built for %s version of MacPython",
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97 (err == cfragImportTooOldErr ? "a newer" : "an older"));
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98 PyErr_SetString(PyExc_ImportError, buf);
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99 return NULL;
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100 }
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101 }
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102 if ( err ) {
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103 PyOS_snprintf(buf, sizeof(buf), "%.*s: %.200s",
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104 errMessage[0], errMessage+1,
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105 PyMac_StrError(err));
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106 PyErr_SetString(PyExc_ImportError, buf);
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107 return NULL;
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108 }
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109 /* Locate the address of the correct init function */
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110 PyOS_snprintf(funcname, sizeof(funcname), "init%.200s", shortname);
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111 err = FindSymbol(connID, Pstring(funcname), &symAddr, &class);
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112 if ( err ) {
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113 PyOS_snprintf(buf, sizeof(buf), "%s: %.200s",
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114 funcname, PyMac_StrError(err));
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115 PyErr_SetString(PyExc_ImportError, buf);
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116 return NULL;
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117 }
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118 p = (dl_funcptr)symAddr;
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119
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120 return p;
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121 }