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 d63a80abfbec
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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2 /* Float object interface */
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3
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4 /*
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5 PyFloatObject represents a (double precision) floating point number.
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6 */
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7
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8 #ifndef Py_FLOATOBJECT_H
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9 #define Py_FLOATOBJECT_H
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10 #ifdef __cplusplus
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11 extern "C" {
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12 #endif
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14 #ifndef Py_LIMITED_API
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15 typedef struct {
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16 PyObject_HEAD
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17 double ob_fval;
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18 } PyFloatObject;
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19 #endif
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20
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21 PyAPI_DATA(PyTypeObject) PyFloat_Type;
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22
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23 #define PyFloat_Check(op) PyObject_TypeCheck(op, &PyFloat_Type)
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24 #define PyFloat_CheckExact(op) (Py_TYPE(op) == &PyFloat_Type)
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26 #ifdef Py_NAN
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27 #define Py_RETURN_NAN return PyFloat_FromDouble(Py_NAN)
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28 #endif
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30 #define Py_RETURN_INF(sign) do \
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31 if (copysign(1., sign) == 1.) { \
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32 return PyFloat_FromDouble(Py_HUGE_VAL); \
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33 } else { \
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34 return PyFloat_FromDouble(-Py_HUGE_VAL); \
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35 } while(0)
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37 PyAPI_FUNC(double) PyFloat_GetMax(void);
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38 PyAPI_FUNC(double) PyFloat_GetMin(void);
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39 PyAPI_FUNC(PyObject *) PyFloat_GetInfo(void);
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40
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41 /* Return Python float from string PyObject. */
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42 PyAPI_FUNC(PyObject *) PyFloat_FromString(PyObject*);
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43
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44 /* Return Python float from C double. */
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45 PyAPI_FUNC(PyObject *) PyFloat_FromDouble(double);
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47 /* Extract C double from Python float. The macro version trades safety for
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48 speed. */
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49 PyAPI_FUNC(double) PyFloat_AsDouble(PyObject *);
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50 #ifndef Py_LIMITED_API
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51 #define PyFloat_AS_DOUBLE(op) (((PyFloatObject *)(op))->ob_fval)
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52 #endif
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54 #ifndef Py_LIMITED_API
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55 /* _PyFloat_{Pack,Unpack}{4,8}
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56 *
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57 * The struct and pickle (at least) modules need an efficient platform-
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58 * independent way to store floating-point values as byte strings.
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59 * The Pack routines produce a string from a C double, and the Unpack
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60 * routines produce a C double from such a string. The suffix (4 or 8)
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61 * specifies the number of bytes in the string.
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62 *
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63 * On platforms that appear to use (see _PyFloat_Init()) IEEE-754 formats
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64 * these functions work by copying bits. On other platforms, the formats the
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65 * 4- byte format is identical to the IEEE-754 single precision format, and
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66 * the 8-byte format to the IEEE-754 double precision format, although the
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67 * packing of INFs and NaNs (if such things exist on the platform) isn't
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68 * handled correctly, and attempting to unpack a string containing an IEEE
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69 * INF or NaN will raise an exception.
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70 *
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71 * On non-IEEE platforms with more precision, or larger dynamic range, than
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72 * 754 supports, not all values can be packed; on non-IEEE platforms with less
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73 * precision, or smaller dynamic range, not all values can be unpacked. What
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74 * happens in such cases is partly accidental (alas).
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75 */
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76
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77 /* The pack routines write 4 or 8 bytes, starting at p. le is a bool
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78 * argument, true if you want the string in little-endian format (exponent
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79 * last, at p+3 or p+7), false if you want big-endian format (exponent
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80 * first, at p).
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81 * Return value: 0 if all is OK, -1 if error (and an exception is
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82 * set, most likely OverflowError).
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83 * There are two problems on non-IEEE platforms:
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84 * 1): What this does is undefined if x is a NaN or infinity.
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85 * 2): -0.0 and +0.0 produce the same string.
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86 */
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87 PyAPI_FUNC(int) _PyFloat_Pack4(double x, unsigned char *p, int le);
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88 PyAPI_FUNC(int) _PyFloat_Pack8(double x, unsigned char *p, int le);
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89
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90 /* Needed for the old way for marshal to store a floating point number.
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91 Returns the string length copied into p, -1 on error.
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92 */
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93 PyAPI_FUNC(int) _PyFloat_Repr(double x, char *p, size_t len);
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94
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95 /* Used to get the important decimal digits of a double */
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96 PyAPI_FUNC(int) _PyFloat_Digits(char *buf, double v, int *signum);
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97 PyAPI_FUNC(void) _PyFloat_DigitsInit(void);
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98
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99 /* The unpack routines read 4 or 8 bytes, starting at p. le is a bool
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100 * argument, true if the string is in little-endian format (exponent
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101 * last, at p+3 or p+7), false if big-endian (exponent first, at p).
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102 * Return value: The unpacked double. On error, this is -1.0 and
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103 * PyErr_Occurred() is true (and an exception is set, most likely
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104 * OverflowError). Note that on a non-IEEE platform this will refuse
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105 * to unpack a string that represents a NaN or infinity.
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106 */
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107 PyAPI_FUNC(double) _PyFloat_Unpack4(const unsigned char *p, int le);
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108 PyAPI_FUNC(double) _PyFloat_Unpack8(const unsigned char *p, int le);
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110 /* free list api */
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111 PyAPI_FUNC(int) PyFloat_ClearFreeList(void);
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112
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113 PyAPI_FUNC(void) _PyFloat_DebugMallocStats(FILE* out);
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114
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115 /* Format the object based on the format_spec, as defined in PEP 3101
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116 (Advanced String Formatting). */
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117 PyAPI_FUNC(int) _PyFloat_FormatAdvancedWriter(
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118 _PyUnicodeWriter *writer,
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119 PyObject *obj,
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120 PyObject *format_spec,
22b56b0b8619 Issue #14744: Use the new _PyUnicodeWriter internal API to speed up str%args and str.format(args)
Victor Stinner <victor.stinner@gmail.com>
parents: 72504
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121 Py_ssize_t start,
22b56b0b8619 Issue #14744: Use the new _PyUnicodeWriter internal API to speed up str%args and str.format(args)
Victor Stinner <victor.stinner@gmail.com>
parents: 72504
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122 Py_ssize_t end);
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62b61abd02b8 Merge branches/pep-0384.
Martin v. Löwis <martin@v.loewis.de>
parents: 63750
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123 #endif /* Py_LIMITED_API */
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0da27fdf0192 Refactor and clean up str.format() code (and helpers) in advance of optimizations.
Eric Smith <eric@trueblade.com>
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124
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519c25039c6a * Added support for X11 modules.
Guido van Rossum <guido@python.org>
parents: 1257
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125 #ifdef __cplusplus
519c25039c6a * Added support for X11 modules.
Guido van Rossum <guido@python.org>
parents: 1257
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126 }
519c25039c6a * Added support for X11 modules.
Guido van Rossum <guido@python.org>
parents: 1257
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127 #endif
519c25039c6a * Added support for X11 modules.
Guido van Rossum <guido@python.org>
parents: 1257
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128 #endif /* !Py_FLOATOBJECT_H */