Mercurial > cpython-lru_cache-weakref

annotate Python/dynload_aix.c @ 87690:66c1c9f32567 default tip

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents e7f6cef7a4cc
children
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 <errno.h> /* for global errno */
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8 #include <string.h> /* for strerror() */
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9 #include <stdlib.h> /* for malloc(), free() */
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10 #include <sys/ldr.h>
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13 #ifdef AIX_GENUINE_CPLUSPLUS
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14 #include <load.h>
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15 #define aix_load loadAndInit
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16 #else
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17 #define aix_load load
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18 #endif
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19
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20
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21 extern char *Py_GetProgramName(void);
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22
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23 typedef struct Module {
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24 struct Module *next;
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25 void *entry;
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26 } Module, *ModulePtr;
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27
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28 const char *_PyImport_DynLoadFiletab[] = {".so", NULL};
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29
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30 static int
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31 aix_getoldmodules(void **modlistptr)
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32 {
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33 ModulePtr modptr, prevmodptr;
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34 struct ld_info *ldiptr;
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35 char *ldibuf;
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36 int errflag, bufsize = 1024;
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37 unsigned int offset;
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38 char *progname = Py_GetProgramName();
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39
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40 /*
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41 -- Get the list of loaded modules into ld_info structures.
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42 */
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43 if ((ldibuf = malloc(bufsize)) == NULL) {
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44 PyErr_SetString(PyExc_ImportError, strerror(errno));
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45 return -1;
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46 }
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47 while ((errflag = loadquery(L_GETINFO, ldibuf, bufsize)) == -1
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48 && errno == ENOMEM) {
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49 free(ldibuf);
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50 bufsize += 1024;
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51 if ((ldibuf = malloc(bufsize)) == NULL) {
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52 PyErr_SetString(PyExc_ImportError, strerror(errno));
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53 return -1;
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54 }
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55 }
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56 if (errflag == -1) {
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57 PyErr_SetString(PyExc_ImportError, strerror(errno));
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58 return -1;
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59 }
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60 /*
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61 -- Make the modules list from the ld_info structures.
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62 */
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63 ldiptr = (struct ld_info *)ldibuf;
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64 prevmodptr = NULL;
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65 do {
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66 if (strstr(progname, ldiptr->ldinfo_filename) == NULL &&
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67 strstr(ldiptr->ldinfo_filename, "python") == NULL) {
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68 /*
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69 -- Extract only the modules belonging to the main
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70 -- executable + those containing "python" as a
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71 -- substring (like the "python[version]" binary or
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72 -- "libpython[version].a" in case it's a shared lib).
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73 */
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74 offset = (unsigned int)ldiptr->ldinfo_next;
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75 ldiptr = (struct ld_info *)((char*)ldiptr + offset);
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76 continue;
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77 }
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78 if ((modptr = (ModulePtr)malloc(sizeof(Module))) == NULL) {
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79 PyErr_SetString(PyExc_ImportError, strerror(errno));
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80 while (*modlistptr) {
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81 modptr = (ModulePtr)*modlistptr;
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82 *modlistptr = (void *)modptr->next;
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83 free(modptr);
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84 }
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85 return -1;
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86 }
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87 modptr->entry = ldiptr->ldinfo_dataorg;
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88 modptr->next = NULL;
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89 if (prevmodptr == NULL)
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90 *modlistptr = (void *)modptr;
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91 else
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92 prevmodptr->next = modptr;
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93 prevmodptr = modptr;
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94 offset = (unsigned int)ldiptr->ldinfo_next;
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95 ldiptr = (struct ld_info *)((char*)ldiptr + offset);
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96 } while (offset);
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97 free(ldibuf);
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98 return 0;
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99 }
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100
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101
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102 static void
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103 aix_loaderror(const char *pathname)
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104 {
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105
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106 char *message[1024], errbuf[1024];
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107 PyObject *pathname_ob = NULL;
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108 PyObject *errbuf_ob = NULL;
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109 int i,j;
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110
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111 struct errtab {
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112 int errNo;
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113 char *errstr;
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114 } load_errtab[] = {
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115 {L_ERROR_TOOMANY, "too many errors, rest skipped."},
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116 {L_ERROR_NOLIB, "can't load library:"},
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117 {L_ERROR_UNDEF, "can't find symbol in library:"},
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118 {L_ERROR_RLDBAD,
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119 "RLD index out of range or bad relocation type:"},
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120 {L_ERROR_FORMAT, "not a valid, executable xcoff file:"},
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121 {L_ERROR_MEMBER,
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122 "file not an archive or does not contain requested member:"},
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123 {L_ERROR_TYPE, "symbol table mismatch:"},
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124 {L_ERROR_ALIGN, "text alignment in file is wrong."},
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125 {L_ERROR_SYSTEM, "System error:"},
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126 {L_ERROR_ERRNO, NULL}
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127 };
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128
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129 #define ERRBUF_APPEND(s) strncat(errbuf, s, sizeof(errbuf)-strlen(errbuf)-1)
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130
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131 PyOS_snprintf(errbuf, sizeof(errbuf), "from module %.200s ", pathname);
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132
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133 if (!loadquery(L_GETMESSAGES, &message[0], sizeof(message))) {
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134 ERRBUF_APPEND(strerror(errno));
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135 ERRBUF_APPEND("\n");
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136 }
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137 for(i = 0; message[i] && *message[i]; i++) {
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138 int nerr = atoi(message[i]);
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139 for (j=0; j < Py_ARRAY_LENGTH(load_errtab); j++) {
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140 if (nerr == load_errtab[j].errNo && load_errtab[j].errstr)
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141 ERRBUF_APPEND(load_errtab[j].errstr);
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142 }
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143 while (Py_ISDIGIT(Py_CHARMASK(*message[i]))) message[i]++ ;
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144 ERRBUF_APPEND(message[i]);
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145 ERRBUF_APPEND("\n");
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146 }
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147 errbuf[strlen(errbuf)-1] = '\0'; /* trim off last newline */
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Brett Cannon <brett@python.org>
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148 pathname_ob = PyUnicode_FromString(pathname);
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149 errbuf_ob = PyUnicode_FromString(errbuf);
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150 PyErr_SetImportError(errbuf_ob, NULL, pathname);
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151 Py_DECREF(pathname_ob);
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152 Py_DECREF(errbuf_ob);
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153 return;
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154 }
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155
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156
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157 dl_funcptr _PyImport_GetDynLoadFunc(const char *shortname,
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158 const char *pathname, FILE *fp)
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159 {
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160 dl_funcptr p;
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161
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162 /*
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163 -- Invoke load() with L_NOAUTODEFER leaving the imported symbols
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164 -- of the shared module unresolved. Thus we have to resolve them
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165 -- explicitly with loadbind. The new module is loaded, then we
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166 -- resolve its symbols using the list of already loaded modules
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167 -- (only those that belong to the python executable). Get these
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168 -- with loadquery(L_GETINFO).
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169 */
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170
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171 static void *staticmodlistptr = NULL;
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172
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173 if (!staticmodlistptr)
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174 if (aix_getoldmodules(&staticmodlistptr) == -1)
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175 return NULL;
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176 p = (dl_funcptr) aix_load((char *)pathname, L_NOAUTODEFER, 0);
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177 if (p == NULL) {
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178 aix_loaderror(pathname);
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179 return NULL;
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180 }
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181
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182 return p;
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183 }