source: vendor/python/2.5/Modules/testcapi_long.h

Last change on this file was 3225, checked in by bird, 18 years ago

Python 2.5
File size: 4.2 KB
Line 
1/* Poor-man's template. Macros used:
2 TESTNAME name of the test (like test_long_api_inner)
3 TYPENAME the signed type (like long)
4 F_S_TO_PY convert signed to pylong; TYPENAME -> PyObject*
5 F_PY_TO_S convert pylong to signed; PyObject* -> TYPENAME
6 F_U_TO_PY convert unsigned to pylong; unsigned TYPENAME -> PyObject*
7 F_PY_TO_U convert pylong to unsigned; PyObject* -> unsigned TYPENAME
8*/
9
10static PyObject *
11TESTNAME(PyObject *error(const char*))
12{
13 const int NBITS = sizeof(TYPENAME) * 8;
14 unsigned TYPENAME base;
15 PyObject *pyresult;
16 int i;
17
18 /* Note: This test lets PyObjects leak if an error is raised. Since
19 an error should never be raised, leaks are impossible <wink>. */
20
21 /* Test native -> PyLong -> native roundtrip identity.
22 * Generate all powers of 2, and test them and their negations,
23 * plus the numbers +-1 off from them.
24 */
25 base = 1;
26 for (i = 0;
27 i < NBITS + 1; /* on last, base overflows to 0 */
28 ++i, base <<= 1)
29 {
30 int j;
31 for (j = 0; j < 6; ++j) {
32 TYPENAME in, out;
33 unsigned TYPENAME uin, uout;
34
35 /* For 0, 1, 2 use base; for 3, 4, 5 use -base */
36 uin = j < 3 ? base
37 : (unsigned TYPENAME)(-(TYPENAME)base);
38
39 /* For 0 & 3, subtract 1.
40 * For 1 & 4, leave alone.
41 * For 2 & 5, add 1.
42 */
43 uin += (unsigned TYPENAME)(TYPENAME)(j % 3 - 1);
44
45 pyresult = F_U_TO_PY(uin);
46 if (pyresult == NULL)
47 return error(
48 "unsigned unexpected null result");
49
50 uout = F_PY_TO_U(pyresult);
51 if (uout == (unsigned TYPENAME)-1 && PyErr_Occurred())
52 return error(
53 "unsigned unexpected -1 result");
54 if (uout != uin)
55 return error(
56 "unsigned output != input");
57 UNBIND(pyresult);
58
59 in = (TYPENAME)uin;
60 pyresult = F_S_TO_PY(in);
61 if (pyresult == NULL)
62 return error(
63 "signed unexpected null result");
64
65 out = F_PY_TO_S(pyresult);
66 if (out == (TYPENAME)-1 && PyErr_Occurred())
67 return error(
68 "signed unexpected -1 result");
69 if (out != in)
70 return error(
71 "signed output != input");
72 UNBIND(pyresult);
73 }
74 }
75
76 /* Overflow tests. The loop above ensured that all limit cases that
77 * should not overflow don't overflow, so all we need to do here is
78 * provoke one-over-the-limit cases (not exhaustive, but sharp).
79 */
80 {
81 PyObject *one, *x, *y;
82 TYPENAME out;
83 unsigned TYPENAME uout;
84
85 one = PyLong_FromLong(1);
86 if (one == NULL)
87 return error(
88 "unexpected NULL from PyLong_FromLong");
89
90 /* Unsigned complains about -1? */
91 x = PyNumber_Negative(one);
92 if (x == NULL)
93 return error(
94 "unexpected NULL from PyNumber_Negative");
95
96 uout = F_PY_TO_U(x);
97 if (uout != (unsigned TYPENAME)-1 || !PyErr_Occurred())
98 return error(
99 "PyLong_AsUnsignedXXX(-1) didn't complain");
100 PyErr_Clear();
101 UNBIND(x);
102
103 /* Unsigned complains about 2**NBITS? */
104 y = PyLong_FromLong((long)NBITS);
105 if (y == NULL)
106 return error(
107 "unexpected NULL from PyLong_FromLong");
108
109 x = PyNumber_Lshift(one, y); /* 1L << NBITS, == 2**NBITS */
110 UNBIND(y);
111 if (x == NULL)
112 return error(
113 "unexpected NULL from PyNumber_Lshift");
114
115 uout = F_PY_TO_U(x);
116 if (uout != (unsigned TYPENAME)-1 || !PyErr_Occurred())
117 return error(
118 "PyLong_AsUnsignedXXX(2**NBITS) didn't "
119 "complain");
120 PyErr_Clear();
121
122 /* Signed complains about 2**(NBITS-1)?
123 x still has 2**NBITS. */
124 y = PyNumber_Rshift(x, one); /* 2**(NBITS-1) */
125 UNBIND(x);
126 if (y == NULL)
127 return error(
128 "unexpected NULL from PyNumber_Rshift");
129
130 out = F_PY_TO_S(y);
131 if (out != (TYPENAME)-1 || !PyErr_Occurred())
132 return error(
133 "PyLong_AsXXX(2**(NBITS-1)) didn't "
134 "complain");
135 PyErr_Clear();
136
137 /* Signed complains about -2**(NBITS-1)-1?;
138 y still has 2**(NBITS-1). */
139 x = PyNumber_Negative(y); /* -(2**(NBITS-1)) */
140 UNBIND(y);
141 if (x == NULL)
142 return error(
143 "unexpected NULL from PyNumber_Negative");
144
145 y = PyNumber_Subtract(x, one); /* -(2**(NBITS-1))-1 */
146 UNBIND(x);
147 if (y == NULL)
148 return error(
149 "unexpected NULL from PyNumber_Subtract");
150
151 out = F_PY_TO_S(y);
152 if (out != (TYPENAME)-1 || !PyErr_Occurred())
153 return error(
154 "PyLong_AsXXX(-2**(NBITS-1)-1) didn't "
155 "complain");
156 PyErr_Clear();
157 UNBIND(y);
158
159 Py_XDECREF(x);
160 Py_XDECREF(y);
161 Py_DECREF(one);
162 }
163
164 Py_INCREF(Py_None);
165 return Py_None;
166}
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