Mercurial > cpython-lru_cache-weakref

annotate Python/asdl.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 142c62a490ce
children
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1 #include "Python.h"
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2 #include "asdl.h"
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3
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4 asdl_seq *
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5 _Py_asdl_seq_new(Py_ssize_t size, PyArena *arena)
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6 {
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7 asdl_seq *seq = NULL;
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8 size_t n = (size ? (sizeof(void *) * (size - 1)) : 0);
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9
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10 /* check size is sane */
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11 if (size < 0 || size == INT_MIN ||
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12 (size && ((size - 1) > (PY_SIZE_MAX / sizeof(void *))))) {
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13 PyErr_NoMemory();
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14 return NULL;
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15 }
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16
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17 /* check if size can be added safely */
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18 if (n > PY_SIZE_MAX - sizeof(asdl_seq)) {
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19 PyErr_NoMemory();
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20 return NULL;
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21 }
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22
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23 n += sizeof(asdl_seq);
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24
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25 seq = (asdl_seq *)PyArena_Malloc(arena, n);
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26 if (!seq) {
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27 PyErr_NoMemory();
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28 return NULL;
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29 }
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30 memset(seq, 0, n);
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31 seq->size = size;
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32 return seq;
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33 }
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34
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35 asdl_int_seq *
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36 _Py_asdl_int_seq_new(Py_ssize_t size, PyArena *arena)
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37 {
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38 asdl_int_seq *seq = NULL;
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39 size_t n = (size ? (sizeof(void *) * (size - 1)) : 0);
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40
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41 /* check size is sane */
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42 if (size < 0 || size == INT_MIN ||
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43 (size && ((size - 1) > (PY_SIZE_MAX / sizeof(void *))))) {
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44 PyErr_NoMemory();
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45 return NULL;
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46 }
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47
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48 /* check if size can be added safely */
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49 if (n > PY_SIZE_MAX - sizeof(asdl_seq)) {
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50 PyErr_NoMemory();
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51 return NULL;
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52 }
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53
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54 n += sizeof(asdl_seq);
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56 seq = (asdl_int_seq *)PyArena_Malloc(arena, n);
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57 if (!seq) {
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58 PyErr_NoMemory();
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59 return NULL;
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60 }
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61 memset(seq, 0, n);
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62 seq->size = size;
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63 return seq;
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64 }