Mercurial > cpython-lru_cache-weakref

annotate Modules/_opcode.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 78ec18f5cb45
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #include "Python.h"
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2 #include "opcode.h"
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3
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4 /*[clinic]
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5 module _opcode
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6 [clinic]*/
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7 /*[clinic checksum: da39a3ee5e6b4b0d3255bfef95601890afd80709]*/
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8
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9 /*[clinic]
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10
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11 _opcode.stack_effect -> int
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12
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13 opcode: int
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14
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15 [
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16 oparg: int
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17 ]
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18 /
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19
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20 Compute the stack effect of the opcode.
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21 [clinic]*/
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22
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23 PyDoc_STRVAR(_opcode_stack_effect__doc__,
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24 "stack_effect(opcode, [oparg])\n"
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25 "Compute the stack effect of the opcode.");
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26
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27 #define _OPCODE_STACK_EFFECT_METHODDEF \
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28 {"stack_effect", (PyCFunction)_opcode_stack_effect, METH_VARARGS, _opcode_stack_effect__doc__},
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29
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30 static int
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31 _opcode_stack_effect_impl(PyModuleDef *module, int opcode, int group_right_1, int oparg);
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32
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33 static PyObject *
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34 _opcode_stack_effect(PyModuleDef *module, PyObject *args)
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35 {
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36 PyObject *return_value = NULL;
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37 int opcode;
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38 int group_right_1 = 0;
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39 int oparg = 0;
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40 int _return_value;
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41
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42 switch (PyTuple_Size(args)) {
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43 case 1:
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44 if (!PyArg_ParseTuple(args, "i:stack_effect", &opcode))
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45 return NULL;
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46 break;
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47 case 2:
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48 if (!PyArg_ParseTuple(args, "ii:stack_effect", &opcode, &oparg))
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49 return NULL;
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50 group_right_1 = 1;
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51 break;
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52 default:
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53 PyErr_SetString(PyExc_TypeError, "_opcode.stack_effect requires 1 to 2 arguments");
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54 return NULL;
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55 }
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56 _return_value = _opcode_stack_effect_impl(module, opcode, group_right_1, oparg);
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57 if ((_return_value == -1) && PyErr_Occurred())
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58 goto exit;
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59 return_value = PyLong_FromLong((long)_return_value);
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60
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61 exit:
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62 return return_value;
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63 }
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64
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65 static int
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66 _opcode_stack_effect_impl(PyModuleDef *module, int opcode, int group_right_1, int oparg)
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67 /*[clinic checksum: e880e62dc7b0de73403026eaf4f8074aa106358b]*/
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68 {
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69 int effect;
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70 if (HAS_ARG(opcode)) {
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71 if (!group_right_1) {
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72 PyErr_SetString(PyExc_ValueError,
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73 "stack_effect: opcode requires oparg but oparg was not specified");
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74 return -1;
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75 }
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76 }
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77 else if (group_right_1) {
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78 PyErr_SetString(PyExc_ValueError,
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79 "stack_effect: opcode does not permit oparg but oparg was specified");
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80 return -1;
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81 }
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82 effect = PyCompile_OpcodeStackEffect(opcode, oparg);
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83 if (effect == PY_INVALID_STACK_EFFECT) {
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84 PyErr_SetString(PyExc_ValueError,
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85 "invalid opcode or oparg");
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86 return -1;
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87 }
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88 return effect;
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89 }
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90
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91
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92
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93
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94 static PyMethodDef
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95 opcode_functions[] = {
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96 _OPCODE_STACK_EFFECT_METHODDEF
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97 {NULL, NULL, 0, NULL}
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98 };
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99
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100
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101 static struct PyModuleDef opcodemodule = {
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102 PyModuleDef_HEAD_INIT,
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103 "_opcode",
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104 "Opcode support module.",
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105 -1,
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106 opcode_functions,
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107 NULL,
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108 NULL,
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109 NULL,
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110 NULL
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111 };
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112
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113 PyMODINIT_FUNC
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114 PyInit__opcode(void)
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115 {
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116 return PyModule_Create(&opcodemodule);
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117 }