Mercurial > cpython-lru_cache-weakref

annotate Modules/_bisectmodule.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 4a09cc62419b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* Bisection algorithms. Drop in replacement for bisect.py
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2
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3 Converted to C by Dmitry Vasiliev (dima at hlabs.spb.ru).
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4 */
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5
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6 #define PY_SSIZE_T_CLEAN
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7 #include "Python.h"
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8
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9 _Py_IDENTIFIER(insert);
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10
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11 static Py_ssize_t
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12 internal_bisect_right(PyObject *list, PyObject *item, Py_ssize_t lo, Py_ssize_t hi)
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13 {
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14 PyObject *litem;
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15 Py_ssize_t mid, res;
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16
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17 if (lo < 0) {
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18 PyErr_SetString(PyExc_ValueError, "lo must be non-negative");
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19 return -1;
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20 }
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21 if (hi == -1) {
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22 hi = PySequence_Size(list);
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23 if (hi < 0)
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24 return -1;
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25 }
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26 while (lo < hi) {
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27 /* The (size_t)cast ensures that the addition and subsequent division
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28 are performed as unsigned operations, avoiding difficulties from
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29 signed overflow. (See issue 13496.) */
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30 mid = ((size_t)lo + hi) / 2;
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31 litem = PySequence_GetItem(list, mid);
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32 if (litem == NULL)
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33 return -1;
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34 res = PyObject_RichCompareBool(item, litem, Py_LT);
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35 Py_DECREF(litem);
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36 if (res < 0)
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37 return -1;
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38 if (res)
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39 hi = mid;
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40 else
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41 lo = mid + 1;
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42 }
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43 return lo;
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44 }
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45
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46 static PyObject *
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47 bisect_right(PyObject *self, PyObject *args, PyObject *kw)
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48 {
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49 PyObject *list, *item;
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50 Py_ssize_t lo = 0;
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51 Py_ssize_t hi = -1;
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52 Py_ssize_t index;
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53 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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54
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55 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|nn:bisect_right",
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56 keywords, &list, &item, &lo, &hi))
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57 return NULL;
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58 index = internal_bisect_right(list, item, lo, hi);
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59 if (index < 0)
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60 return NULL;
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61 return PyLong_FromSsize_t(index);
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62 }
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63
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64 PyDoc_STRVAR(bisect_right_doc,
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65 "bisect_right(a, x[, lo[, hi]]) -> index\n\
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66 \n\
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67 Return the index where to insert item x in list a, assuming a is sorted.\n\
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68 \n\
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69 The return value i is such that all e in a[:i] have e <= x, and all e in\n\
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70 a[i:] have e > x. So if x already appears in the list, i points just\n\
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71 beyond the rightmost x already there\n\
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72 \n\
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73 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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74 slice of a to be searched.\n");
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75
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76 static PyObject *
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77 insort_right(PyObject *self, PyObject *args, PyObject *kw)
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78 {
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79 PyObject *list, *item, *result;
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80 Py_ssize_t lo = 0;
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81 Py_ssize_t hi = -1;
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82 Py_ssize_t index;
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83 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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84
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85 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|nn:insort_right",
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86 keywords, &list, &item, &lo, &hi))
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87 return NULL;
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88 index = internal_bisect_right(list, item, lo, hi);
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89 if (index < 0)
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90 return NULL;
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91 if (PyList_CheckExact(list)) {
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92 if (PyList_Insert(list, index, item) < 0)
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93 return NULL;
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94 } else {
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95 result = _PyObject_CallMethodId(list, &PyId_insert, "nO", index, item);
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96 if (result == NULL)
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97 return NULL;
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98 Py_DECREF(result);
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99 }
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100
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101 Py_RETURN_NONE;
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102 }
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103
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104 PyDoc_STRVAR(insort_right_doc,
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105 "insort_right(a, x[, lo[, hi]])\n\
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106 \n\
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107 Insert item x in list a, and keep it sorted assuming a is sorted.\n\
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108 \n\
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109 If x is already in a, insert it to the right of the rightmost x.\n\
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110 \n\
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111 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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112 slice of a to be searched.\n");
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113
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114 static Py_ssize_t
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115 internal_bisect_left(PyObject *list, PyObject *item, Py_ssize_t lo, Py_ssize_t hi)
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116 {
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117 PyObject *litem;
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118 Py_ssize_t mid, res;
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119
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120 if (lo < 0) {
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121 PyErr_SetString(PyExc_ValueError, "lo must be non-negative");
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122 return -1;
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123 }
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124 if (hi == -1) {
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125 hi = PySequence_Size(list);
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126 if (hi < 0)
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127 return -1;
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128 }
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129 while (lo < hi) {
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130 /* The (size_t)cast ensures that the addition and subsequent division
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131 are performed as unsigned operations, avoiding difficulties from
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132 signed overflow. (See issue 13496.) */
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133 mid = ((size_t)lo + hi) / 2;
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134 litem = PySequence_GetItem(list, mid);
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135 if (litem == NULL)
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136 return -1;
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137 res = PyObject_RichCompareBool(litem, item, Py_LT);
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138 Py_DECREF(litem);
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139 if (res < 0)
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140 return -1;
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141 if (res)
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142 lo = mid + 1;
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143 else
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144 hi = mid;
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145 }
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146 return lo;
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147 }
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148
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149 static PyObject *
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150 bisect_left(PyObject *self, PyObject *args, PyObject *kw)
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151 {
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152 PyObject *list, *item;
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153 Py_ssize_t lo = 0;
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154 Py_ssize_t hi = -1;
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155 Py_ssize_t index;
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156 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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157
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158 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|nn:bisect_left",
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159 keywords, &list, &item, &lo, &hi))
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160 return NULL;
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161 index = internal_bisect_left(list, item, lo, hi);
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162 if (index < 0)
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163 return NULL;
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164 return PyLong_FromSsize_t(index);
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165 }
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166
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167 PyDoc_STRVAR(bisect_left_doc,
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168 "bisect_left(a, x[, lo[, hi]]) -> index\n\
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169 \n\
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170 Return the index where to insert item x in list a, assuming a is sorted.\n\
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171 \n\
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172 The return value i is such that all e in a[:i] have e < x, and all e in\n\
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173 a[i:] have e >= x. So if x already appears in the list, i points just\n\
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174 before the leftmost x already there.\n\
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175 \n\
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176 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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177 slice of a to be searched.\n");
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178
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179 static PyObject *
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180 insort_left(PyObject *self, PyObject *args, PyObject *kw)
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181 {
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182 PyObject *list, *item, *result;
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183 Py_ssize_t lo = 0;
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184 Py_ssize_t hi = -1;
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185 Py_ssize_t index;
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186 static char *keywords[] = {"a", "x", "lo", "hi", NULL};
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187
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188 if (!PyArg_ParseTupleAndKeywords(args, kw, "OO|nn:insort_left",
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189 keywords, &list, &item, &lo, &hi))
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190 return NULL;
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191 index = internal_bisect_left(list, item, lo, hi);
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192 if (index < 0)
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193 return NULL;
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194 if (PyList_CheckExact(list)) {
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195 if (PyList_Insert(list, index, item) < 0)
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196 return NULL;
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197 } else {
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198 result = _PyObject_CallMethodId(list, &PyId_insert, "nO", index, item);
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199 if (result == NULL)
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200 return NULL;
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201 Py_DECREF(result);
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202 }
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203
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204 Py_RETURN_NONE;
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205 }
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206
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207 PyDoc_STRVAR(insort_left_doc,
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208 "insort_left(a, x[, lo[, hi]])\n\
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209 \n\
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210 Insert item x in list a, and keep it sorted assuming a is sorted.\n\
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211 \n\
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212 If x is already in a, insert it to the left of the leftmost x.\n\
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213 \n\
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214 Optional args lo (default 0) and hi (default len(a)) bound the\n\
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215 slice of a to be searched.\n");
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216
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217 PyDoc_STRVAR(bisect_doc, "Alias for bisect_right().\n");
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218 PyDoc_STRVAR(insort_doc, "Alias for insort_right().\n");
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219
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220 static PyMethodDef bisect_methods[] = {
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221 {"bisect_right", (PyCFunction)bisect_right,
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222 METH_VARARGS|METH_KEYWORDS, bisect_right_doc},
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223 {"bisect", (PyCFunction)bisect_right,
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224 METH_VARARGS|METH_KEYWORDS, bisect_doc},
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225 {"insort_right", (PyCFunction)insort_right,
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226 METH_VARARGS|METH_KEYWORDS, insort_right_doc},
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227 {"insort", (PyCFunction)insort_right,
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228 METH_VARARGS|METH_KEYWORDS, insort_doc},
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229 {"bisect_left", (PyCFunction)bisect_left,
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230 METH_VARARGS|METH_KEYWORDS, bisect_left_doc},
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231 {"insort_left", (PyCFunction)insort_left,
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232 METH_VARARGS|METH_KEYWORDS, insort_left_doc},
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233 {NULL, NULL} /* sentinel */
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234 };
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235
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236 PyDoc_STRVAR(module_doc,
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237 "Bisection algorithms.\n\
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238 \n\
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239 This module provides support for maintaining a list in sorted order without\n\
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240 having to sort the list after each insertion. For long lists of items with\n\
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241 expensive comparison operations, this can be an improvement over the more\n\
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242 common approach.\n");
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243
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244
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245 static struct PyModuleDef _bisectmodule = {
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246 PyModuleDef_HEAD_INIT,
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247 "_bisect",
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248 module_doc,
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249 -1,
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250 bisect_methods,
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251 NULL,
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252 NULL,
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253 NULL,
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254 NULL
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255 };
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256
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257 PyMODINIT_FUNC
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258 PyInit__bisect(void)
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259 {
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260 return PyModule_Create(&_bisectmodule);
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261 }