Mercurial > cpython-lru_cache-weakref

annotate Modules/testcapi_long.h @ 27998:e27f58a50737 legacy-trunk

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SF bug #690377: Dud footnote reference in distutils docs
author Raymond Hettinger <python@rcn.com>
date Fri, 21 Feb 2003 02:47:09 +0000
parents e887d6862f77
children e38335d4df91 a00745480120
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1 /* Poor-man's template. Macros used:
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2 TESTNAME name of the test (like test_long_api_inner)
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3 TYPENAME the signed type (like long)
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4 F_S_TO_PY convert signed to pylong; TYPENAME -> PyObject*
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5 F_PY_TO_S convert pylong to signed; PyObject* -> TYPENAME
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6 F_U_TO_PY convert unsigned to pylong; unsigned TYPENAME -> PyObject*
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7 F_PY_TO_U convert pylong to unsigned; PyObject* -> unsigned TYPENAME
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8 */
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9
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10 static PyObject *
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11 TESTNAME(PyObject *error(const char*))
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12 {
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13 const int NBITS = sizeof(TYPENAME) * 8;
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14 unsigned TYPENAME base;
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15 PyObject *pyresult;
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16 int i;
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17
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18 /* Note: This test lets PyObjects leak if an error is raised. Since
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19 an error should never be raised, leaks are impossible <wink>. */
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20
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21 /* Test native -> PyLong -> native roundtrip identity.
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22 * Generate all powers of 2, and test them and their negations,
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23 * plus the numbers +-1 off from them.
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24 */
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25 base = 1;
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26 for (i = 0;
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27 i < NBITS + 1; /* on last, base overflows to 0 */
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28 ++i, base <<= 1)
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29 {
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30 int j;
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31 for (j = 0; j < 6; ++j) {
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32 TYPENAME in, out;
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33 unsigned TYPENAME uin, uout;
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34
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35 /* For 0, 1, 2 use base; for 3, 4, 5 use -base */
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36 uin = j < 3 ? base
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37 : (unsigned TYPENAME)(-(TYPENAME)base);
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38
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39 /* For 0 & 3, subtract 1.
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40 * For 1 & 4, leave alone.
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41 * For 2 & 5, add 1.
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42 */
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43 uin += (unsigned TYPENAME)(TYPENAME)(j % 3 - 1);
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44
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45 pyresult = F_U_TO_PY(uin);
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46 if (pyresult == NULL)
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47 return error(
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48 "unsigned unexpected null result");
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49
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50 uout = F_PY_TO_U(pyresult);
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51 if (uout == (unsigned TYPENAME)-1 && PyErr_Occurred())
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52 return error(
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53 "unsigned unexpected -1 result");
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54 if (uout != uin)
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55 return error(
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56 "unsigned output != input");
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57 UNBIND(pyresult);
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58
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59 in = (TYPENAME)uin;
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60 pyresult = F_S_TO_PY(in);
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61 if (pyresult == NULL)
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62 return error(
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63 "signed unexpected null result");
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64
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65 out = F_PY_TO_S(pyresult);
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66 if (out == (TYPENAME)-1 && PyErr_Occurred())
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67 return error(
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68 "signed unexpected -1 result");
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69 if (out != in)
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70 return error(
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71 "signed output != input");
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72 UNBIND(pyresult);
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73 }
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74 }
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75
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76 /* Overflow tests. The loop above ensured that all limit cases that
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77 * should not overflow don't overflow, so all we need to do here is
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78 * provoke one-over-the-limit cases (not exhaustive, but sharp).
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79 */
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80 {
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81 PyObject *one, *x, *y;
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82 TYPENAME out;
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83 unsigned TYPENAME uout;
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84
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85 one = PyLong_FromLong(1);
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86 if (one == NULL)
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87 return error(
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88 "unexpected NULL from PyLong_FromLong");
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89
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90 /* Unsigned complains about -1? */
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91 x = PyNumber_Negative(one);
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92 if (x == NULL)
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93 return error(
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94 "unexpected NULL from PyNumber_Negative");
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95
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96 uout = F_PY_TO_U(x);
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97 if (uout != (unsigned TYPENAME)-1 || !PyErr_Occurred())
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98 return error(
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99 "PyLong_AsUnsignedXXX(-1) didn't complain");
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100 PyErr_Clear();
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101 UNBIND(x);
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102
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103 /* Unsigned complains about 2**NBITS? */
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104 y = PyLong_FromLong((long)NBITS);
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105 if (y == NULL)
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106 return error(
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107 "unexpected NULL from PyLong_FromLong");
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108
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109 x = PyNumber_Lshift(one, y); /* 1L << NBITS, == 2**NBITS */
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110 UNBIND(y);
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111 if (x == NULL)
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112 return error(
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113 "unexpected NULL from PyNumber_Lshift");
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114
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115 uout = F_PY_TO_U(x);
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116 if (uout != (unsigned TYPENAME)-1 || !PyErr_Occurred())
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117 return error(
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118 "PyLong_AsUnsignedXXX(2**NBITS) didn't "
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119 "complain");
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120 PyErr_Clear();
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121
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122 /* Signed complains about 2**(NBITS-1)?
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123 x still has 2**NBITS. */
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124 y = PyNumber_Rshift(x, one); /* 2**(NBITS-1) */
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125 UNBIND(x);
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126 if (y == NULL)
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127 return error(
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128 "unexpected NULL from PyNumber_Rshift");
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129
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130 out = F_PY_TO_S(y);
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131 if (out != (TYPENAME)-1 || !PyErr_Occurred())
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132 return error(
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133 "PyLong_AsXXX(2**(NBITS-1)) didn't "
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134 "complain");
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135 PyErr_Clear();
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136
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137 /* Signed complains about -2**(NBITS-1)-1?;
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138 y still has 2**(NBITS-1). */
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139 x = PyNumber_Negative(y); /* -(2**(NBITS-1)) */
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140 UNBIND(y);
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141 if (x == NULL)
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142 return error(
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143 "unexpected NULL from PyNumber_Negative");
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144
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145 y = PyNumber_Subtract(x, one); /* -(2**(NBITS-1))-1 */
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146 UNBIND(x);
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147 if (y == NULL)
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148 return error(
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149 "unexpected NULL from PyNumber_Subtract");
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150
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151 out = F_PY_TO_S(y);
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152 if (out != (TYPENAME)-1 || !PyErr_Occurred())
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153 return error(
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154 "PyLong_AsXXX(-2**(NBITS-1)-1) didn't "
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155 "complain");
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156 PyErr_Clear();
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157 UNBIND(y);
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158
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159 Py_XDECREF(x);
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160 Py_XDECREF(y);
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161 Py_DECREF(one);
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162 }
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163
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164 Py_INCREF(Py_None);
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165 return Py_None;
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166 }