Mercurial > cpython-lru_cache-weakref
annotate Python/structmember.c @ 1290:7971fecbf28e legacy-trunk
* Lots of small changes related to access.
* Added "access *: ...", made access work for class methods.
* Introduced subclass check: make sure that when calling
ClassName.methodname(instance, ...), the instance is an instance of
ClassName or of a subclass thereof (this might break some old code!)
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Fri, 21 May 1993 19:56:10 +0000 |
| parents | 1cabc2b6c970 |
| children | b724599401ff |
| rev | line source |
|---|---|
| 145 | 1 /*********************************************************** |
|
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2 Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum, |
|
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3 Amsterdam, The Netherlands. |
| 145 | 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 not be used in advertising or publicity pertaining to | |
| 13 distribution of the software without specific, written prior permission. | |
| 14 | |
| 15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO | |
| 16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
| 17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE | |
| 18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| 19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
| 20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT | |
| 21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
| 22 | |
| 23 ******************************************************************/ | |
| 24 | |
| 86 | 25 /* Map C struct members to Python object attributes */ |
| 26 | |
| 27 #include "allobjects.h" | |
| 28 | |
| 29 #include "structmember.h" | |
| 30 | |
|
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31 static object * |
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32 listmembers(mlist) |
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33 struct memberlist *mlist; |
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34 { |
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35 int i, n; |
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36 object *v; |
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37 for (n = 0; mlist[n].name != NULL; n++) |
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38 ; |
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39 v = newlistobject(n); |
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40 if (v != NULL) { |
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41 for (i = 0; i < n; i++) |
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42 setlistitem(v, i, newstringobject(mlist[i].name)); |
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43 if (err_occurred()) { |
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44 DECREF(v); |
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45 v = NULL; |
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46 } |
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47 else { |
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48 sortlist(v); |
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49 } |
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50 } |
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51 return v; |
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52 } |
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53 |
| 86 | 54 object * |
| 55 getmember(addr, mlist, name) | |
| 56 char *addr; | |
| 57 struct memberlist *mlist; | |
| 58 char *name; | |
| 59 { | |
| 60 struct memberlist *l; | |
| 61 | |
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62 if (strcmp(name, "__members__") == 0) |
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63 return listmembers(mlist); |
| 86 | 64 for (l = mlist; l->name != NULL; l++) { |
| 65 if (strcmp(l->name, name) == 0) { | |
| 66 object *v; | |
| 67 addr += l->offset; | |
| 68 switch (l->type) { | |
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69 case T_BYTE: |
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70 v = newintobject((long) |
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71 (((*(char*)addr & 0xff) |
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72 ^ 0x80) - 0x80)); |
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73 break; |
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74 case T_UBYTE: |
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75 v = newintobject((long) *(char*)addr & 0xff); |
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76 break; |
| 86 | 77 case T_SHORT: |
| 78 v = newintobject((long) *(short*)addr); | |
| 79 break; | |
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80 case T_USHORT: |
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81 v = newintobject((long) |
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82 *(unsigned short*)addr); |
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83 break; |
| 86 | 84 case T_INT: |
| 85 v = newintobject((long) *(int*)addr); | |
| 86 break; | |
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87 case T_UINT: |
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88 v = newintobject((long) *(unsigned int*)addr); |
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89 break; |
| 86 | 90 case T_LONG: |
| 91 v = newintobject(*(long*)addr); | |
| 92 break; | |
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93 case T_ULONG: |
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94 v = dnewlongobject((double) |
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95 *(unsigned long*)addr); |
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96 break; |
| 86 | 97 case T_FLOAT: |
| 98 v = newfloatobject((double)*(float*)addr); | |
| 99 break; | |
| 100 case T_DOUBLE: | |
| 101 v = newfloatobject(*(double*)addr); | |
| 102 break; | |
| 103 case T_STRING: | |
| 104 if (*(char**)addr == NULL) { | |
| 105 INCREF(None); | |
| 106 v = None; | |
| 107 } | |
| 108 else | |
| 109 v = newstringobject(*(char**)addr); | |
| 110 break; | |
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111 case T_CHAR: |
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112 v = newsizedstringobject((char*)addr, 1); |
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113 break; |
| 86 | 114 case T_OBJECT: |
| 115 v = *(object **)addr; | |
| 116 if (v == NULL) | |
| 117 v = None; | |
| 118 INCREF(v); | |
| 119 break; | |
| 120 default: | |
| 121 err_setstr(SystemError, "bad memberlist type"); | |
| 122 v = NULL; | |
| 123 } | |
| 124 return v; | |
| 125 } | |
| 126 } | |
| 127 | |
| 475 | 128 err_setstr(AttributeError, name); |
| 86 | 129 return NULL; |
| 130 } | |
| 131 | |
| 132 int | |
| 133 setmember(addr, mlist, name, v) | |
| 134 char *addr; | |
| 135 struct memberlist *mlist; | |
| 136 char *name; | |
| 137 object *v; | |
| 138 { | |
| 139 struct memberlist *l; | |
| 140 | |
| 141 for (l = mlist; l->name != NULL; l++) { | |
| 142 if (strcmp(l->name, name) == 0) { | |
| 143 if (l->readonly || l->type == T_STRING) { | |
| 475 | 144 err_setstr(TypeError, "readonly attribute"); |
| 86 | 145 return -1; |
| 146 } | |
| 147 addr += l->offset; | |
| 148 switch (l->type) { | |
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149 case T_BYTE: |
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150 case T_UBYTE: |
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151 if (!is_intobject(v)) { |
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152 err_badarg(); |
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153 return -1; |
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154 } |
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155 *(char*)addr = getintvalue(v); |
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156 break; |
| 86 | 157 case T_SHORT: |
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158 case T_USHORT: |
| 86 | 159 if (!is_intobject(v)) { |
| 160 err_badarg(); | |
| 161 return -1; | |
| 162 } | |
| 163 *(short*)addr = getintvalue(v); | |
| 164 break; | |
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165 case T_UINT: |
| 86 | 166 case T_INT: |
| 167 if (!is_intobject(v)) { | |
| 168 err_badarg(); | |
| 169 return -1; | |
| 170 } | |
| 171 *(int*)addr = getintvalue(v); | |
| 172 break; | |
| 173 case T_LONG: | |
| 174 if (!is_intobject(v)) { | |
| 175 err_badarg(); | |
| 176 return -1; | |
| 177 } | |
| 178 *(long*)addr = getintvalue(v); | |
| 179 break; | |
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180 case T_ULONG: |
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181 if (is_intobject(v)) |
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182 *(long*)addr = getintvalue(v); |
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183 else if (is_longobject(v)) |
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184 *(long*)addr = getlongvalue(v); |
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185 else { |
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186 err_badarg(); |
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187 return -1; |
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188 } |
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189 break; |
| 86 | 190 case T_FLOAT: |
| 191 if (is_intobject(v)) | |
| 192 *(float*)addr = getintvalue(v); | |
| 193 else if (is_floatobject(v)) | |
| 194 *(float*)addr = getfloatvalue(v); | |
| 195 else { | |
| 196 err_badarg(); | |
| 197 return -1; | |
| 198 } | |
| 199 break; | |
| 200 case T_DOUBLE: | |
| 201 if (is_intobject(v)) | |
| 202 *(double*)addr = getintvalue(v); | |
| 203 else if (is_floatobject(v)) | |
| 204 *(double*)addr = getfloatvalue(v); | |
| 205 else { | |
| 206 err_badarg(); | |
| 207 return -1; | |
| 208 } | |
| 209 break; | |
| 210 case T_OBJECT: | |
| 211 XDECREF(*(object **)addr); | |
| 212 XINCREF(v); | |
| 213 *(object **)addr = v; | |
| 214 break; | |
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215 case T_CHAR: |
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216 if (is_stringobject(v) && |
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217 getstringsize(v) == 1) { |
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218 *(char*)addr = |
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219 getstringvalue(v)[0]; |
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220 } |
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221 else { |
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222 err_badarg(); |
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223 return -1; |
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224 } |
| 86 | 225 default: |
| 226 err_setstr(SystemError, "bad memberlist type"); | |
| 227 return -1; | |
| 228 } | |
| 229 return 0; | |
| 230 } | |
| 231 } | |
| 232 | |
| 475 | 233 err_setstr(AttributeError, name); |
| 95 | 234 return -1; |
| 86 | 235 } |