Mercurial > cpython-lru_cache-weakref

annotate Modules/symtablemodule.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 f5c729dbe9fb
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "Python.h"
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2
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3 #include "code.h"
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4 #include "Python-ast.h"
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5 #include "symtable.h"
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6
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7 static PyObject *
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8 symtable_symtable(PyObject *self, PyObject *args)
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9 {
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10 struct symtable *st;
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11 PyObject *t;
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12
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13 char *str;
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14 PyObject *filename;
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15 char *startstr;
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16 int start;
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17
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18 if (!PyArg_ParseTuple(args, "sO&s:symtable",
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19 &str, PyUnicode_FSDecoder, &filename, &startstr))
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20 return NULL;
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21 if (strcmp(startstr, "exec") == 0)
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22 start = Py_file_input;
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23 else if (strcmp(startstr, "eval") == 0)
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24 start = Py_eval_input;
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25 else if (strcmp(startstr, "single") == 0)
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26 start = Py_single_input;
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27 else {
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28 PyErr_SetString(PyExc_ValueError,
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29 "symtable() arg 3 must be 'exec' or 'eval' or 'single'");
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30 Py_DECREF(filename);
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31 return NULL;
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32 }
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33 st = Py_SymtableStringObject(str, filename, start);
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34 Py_DECREF(filename);
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35 if (st == NULL)
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36 return NULL;
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37 t = (PyObject *)st->st_top;
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38 Py_INCREF(t);
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39 PyMem_Free((void *)st->st_future);
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40 PySymtable_Free(st);
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41 return t;
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42 }
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43
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44 static PyMethodDef symtable_methods[] = {
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45 {"symtable", symtable_symtable, METH_VARARGS,
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46 PyDoc_STR("Return symbol and scope dictionaries"
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47 " used internally by compiler.")},
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48 {NULL, NULL} /* sentinel */
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49 };
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50
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51 static struct PyModuleDef symtablemodule = {
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52 PyModuleDef_HEAD_INIT,
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53 "_symtable",
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54 NULL,
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55 -1,
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56 symtable_methods,
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57 NULL,
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58 NULL,
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59 NULL,
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60 NULL
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61 };
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62
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63 PyMODINIT_FUNC
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64 PyInit__symtable(void)
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65 {
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66 PyObject *m;
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67
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68 if (PyType_Ready(&PySTEntry_Type) < 0)
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69 return NULL;
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70
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71 m = PyModule_Create(&symtablemodule);
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72 if (m == NULL)
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73 return NULL;
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74 PyModule_AddIntMacro(m, USE);
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75 PyModule_AddIntMacro(m, DEF_GLOBAL);
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76 PyModule_AddIntMacro(m, DEF_LOCAL);
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77 PyModule_AddIntMacro(m, DEF_PARAM);
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78 PyModule_AddIntMacro(m, DEF_FREE);
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79 PyModule_AddIntMacro(m, DEF_FREE_CLASS);
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80 PyModule_AddIntMacro(m, DEF_IMPORT);
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81 PyModule_AddIntMacro(m, DEF_BOUND);
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82
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83 PyModule_AddIntConstant(m, "TYPE_FUNCTION", FunctionBlock);
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84 PyModule_AddIntConstant(m, "TYPE_CLASS", ClassBlock);
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85 PyModule_AddIntConstant(m, "TYPE_MODULE", ModuleBlock);
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86
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87 PyModule_AddIntMacro(m, OPT_IMPORT_STAR);
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88 PyModule_AddIntMacro(m, OPT_TOPLEVEL);
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89
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90 PyModule_AddIntMacro(m, LOCAL);
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91 PyModule_AddIntMacro(m, GLOBAL_EXPLICIT);
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92 PyModule_AddIntMacro(m, GLOBAL_IMPLICIT);
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93 PyModule_AddIntMacro(m, FREE);
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94 PyModule_AddIntMacro(m, CELL);
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95
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96 PyModule_AddIntConstant(m, "SCOPE_OFF", SCOPE_OFFSET);
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97 PyModule_AddIntMacro(m, SCOPE_MASK);
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98
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99 if (PyErr_Occurred()) {
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100 Py_DECREF(m);
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101 m = 0;
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102 }
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103 return m;
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104 }