Mercurial > cpython-lru_cache-weakref

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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 6a56eaa5e5fb
children
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2 /* Method object interface */
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4 #ifndef Py_METHODOBJECT_H
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5 #define Py_METHODOBJECT_H
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6 #ifdef __cplusplus
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7 extern "C" {
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8 #endif
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10 /* This is about the type 'builtin_function_or_method',
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11 not Python methods in user-defined classes. See classobject.h
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12 for the latter. */
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14 PyAPI_DATA(PyTypeObject) PyCFunction_Type;
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16 #define PyCFunction_Check(op) (Py_TYPE(op) == &PyCFunction_Type)
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18 typedef PyObject *(*PyCFunction)(PyObject *, PyObject *);
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19 typedef PyObject *(*PyCFunctionWithKeywords)(PyObject *, PyObject *,
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20 PyObject *);
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21 typedef PyObject *(*PyNoArgsFunction)(PyObject *);
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23 PyAPI_FUNC(PyCFunction) PyCFunction_GetFunction(PyObject *);
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24 PyAPI_FUNC(PyObject *) PyCFunction_GetSelf(PyObject *);
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25 PyAPI_FUNC(int) PyCFunction_GetFlags(PyObject *);
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27 /* Macros for direct access to these values. Type checks are *not*
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28 done, so use with care. */
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29 #ifndef Py_LIMITED_API
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30 #define PyCFunction_GET_FUNCTION(func) \
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31 (((PyCFunctionObject *)func) -> m_ml -> ml_meth)
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32 #define PyCFunction_GET_SELF(func) \
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33 (((PyCFunctionObject *)func) -> m_ml -> ml_flags & METH_STATIC ? \
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34 NULL : ((PyCFunctionObject *)func) -> m_self)
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35 #define PyCFunction_GET_FLAGS(func) \
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36 (((PyCFunctionObject *)func) -> m_ml -> ml_flags)
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37 #endif
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38 PyAPI_FUNC(PyObject *) PyCFunction_Call(PyObject *, PyObject *, PyObject *);
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40 struct PyMethodDef {
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41 const char *ml_name; /* The name of the built-in function/method */
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42 PyCFunction ml_meth; /* The C function that implements it */
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43 int ml_flags; /* Combination of METH_xxx flags, which mostly
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44 describe the args expected by the C func */
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45 const char *ml_doc; /* The __doc__ attribute, or NULL */
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46 };
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47 typedef struct PyMethodDef PyMethodDef;
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49 #define PyCFunction_New(ML, SELF) PyCFunction_NewEx((ML), (SELF), NULL)
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50 PyAPI_FUNC(PyObject *) PyCFunction_NewEx(PyMethodDef *, PyObject *,
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51 PyObject *);
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53 /* Flag passed to newmethodobject */
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54 /* #define METH_OLDARGS 0x0000 -- unsupported now */
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55 #define METH_VARARGS 0x0001
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56 #define METH_KEYWORDS 0x0002
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57 /* METH_NOARGS and METH_O must not be combined with the flags above. */
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58 #define METH_NOARGS 0x0004
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59 #define METH_O 0x0008
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61 /* METH_CLASS and METH_STATIC are a little different; these control
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62 the construction of methods for a class. These cannot be used for
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63 functions in modules. */
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64 #define METH_CLASS 0x0010
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65 #define METH_STATIC 0x0020
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67 /* METH_COEXIST allows a method to be entered even though a slot has
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68 already filled the entry. When defined, the flag allows a separate
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69 method, "__contains__" for example, to coexist with a defined
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70 slot like sq_contains. */
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71
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72 #define METH_COEXIST 0x0040
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74 #ifndef Py_LIMITED_API
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75 typedef struct {
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76 PyObject_HEAD
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77 PyMethodDef *m_ml; /* Description of the C function to call */
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78 PyObject *m_self; /* Passed as 'self' arg to the C func, can be NULL */
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79 PyObject *m_module; /* The __module__ attribute, can be anything */
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80 } PyCFunctionObject;
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81 #endif
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83 PyAPI_FUNC(int) PyCFunction_ClearFreeList(void);
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85 #ifndef Py_LIMITED_API
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86 PyAPI_FUNC(void) _PyCFunction_DebugMallocStats(FILE *out);
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87 PyAPI_FUNC(void) _PyMethod_DebugMallocStats(FILE *out);
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88 #endif
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90 #ifdef __cplusplus
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91 }
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92 #endif
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93 #endif /* !Py_METHODOBJECT_H */