1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182
|
#include "Python.h"
#include "compile.h"
#include "symtable.h"
#include "graminit.h"
#include "structmember.h"
/* The compiler uses this function to load a PySymtableEntry object
for a code block. Each block is loaded twice, once during the
symbol table pass and once during the code gen pass. Entries
created during the first pass are cached for the second pass, using
the st_symbols dictionary.
The cache is keyed by st_nscopes. Each code block node in a
module's parse tree can be assigned a unique id based on the order
in which the nodes are visited by the compiler. This strategy
works so long as the symbol table and codegen passes visit the same
nodes in the same order.
*/
PyObject *
PySymtableEntry_New(struct symtable *st, char *name, int type, int lineno)
{
PySymtableEntryObject *ste = NULL;
PyObject *k, *v;
k = PyInt_FromLong(st->st_nscopes++);
if (k == NULL)
goto fail;
v = PyDict_GetItem(st->st_symbols, k);
if (v) {
Py_DECREF(k);
Py_INCREF(v);
return v;
}
ste = (PySymtableEntryObject *)PyObject_New(PySymtableEntryObject,
&PySymtableEntry_Type);
ste->ste_table = st;
ste->ste_id = k;
v = PyString_FromString(name);
if (v == NULL)
goto fail;
ste->ste_name = v;
v = PyDict_New();
if (v == NULL)
goto fail;
ste->ste_symbols = v;
v = PyList_New(0);
if (v == NULL)
goto fail;
ste->ste_varnames = v;
v = PyList_New(0);
if (v == NULL)
goto fail;
ste->ste_children = v;
ste->ste_optimized = 0;
ste->ste_opt_lineno = 0;
ste->ste_tmpname = 0;
ste->ste_lineno = lineno;
switch (type) {
case funcdef:
case lambdef:
case testlist_gexp: /* generator expression */
case argument: /* generator expression */
ste->ste_type = TYPE_FUNCTION;
break;
case classdef:
ste->ste_type = TYPE_CLASS;
break;
case single_input:
case eval_input:
case file_input:
ste->ste_type = TYPE_MODULE;
break;
}
if (st->st_cur == NULL)
ste->ste_nested = 0;
else if (st->st_cur->ste_nested
|| st->st_cur->ste_type == TYPE_FUNCTION)
ste->ste_nested = 1;
else
ste->ste_nested = 0;
ste->ste_child_free = 0;
ste->ste_generator = 0;
if (PyDict_SetItem(st->st_symbols, ste->ste_id, (PyObject *)ste) < 0)
goto fail;
return (PyObject *)ste;
fail:
Py_XDECREF(ste);
return NULL;
}
static PyObject *
ste_repr(PySymtableEntryObject *ste)
{
char buf[256];
PyOS_snprintf(buf, sizeof(buf),
"<symtable entry %.100s(%ld), line %d>",
PyString_AS_STRING(ste->ste_name),
PyInt_AS_LONG(ste->ste_id),
ste->ste_lineno);
return PyString_FromString(buf);
}
static void
ste_dealloc(PySymtableEntryObject *ste)
{
ste->ste_table = NULL;
Py_XDECREF(ste->ste_id);
Py_XDECREF(ste->ste_name);
Py_XDECREF(ste->ste_symbols);
Py_XDECREF(ste->ste_varnames);
Py_XDECREF(ste->ste_children);
PyObject_Del(ste);
}
#define OFF(x) offsetof(PySymtableEntryObject, x)
static PyMemberDef ste_memberlist[] = {
{"id", T_OBJECT, OFF(ste_id), READONLY},
{"name", T_OBJECT, OFF(ste_name), READONLY},
{"symbols", T_OBJECT, OFF(ste_symbols), READONLY},
{"varnames", T_OBJECT, OFF(ste_varnames), READONLY},
{"children", T_OBJECT, OFF(ste_children), READONLY},
{"type", T_INT, OFF(ste_type), READONLY},
{"lineno", T_INT, OFF(ste_lineno), READONLY},
{"optimized",T_INT, OFF(ste_optimized), READONLY},
{"nested", T_INT, OFF(ste_nested), READONLY},
{NULL}
};
PyTypeObject PySymtableEntry_Type = {
PyObject_HEAD_INIT(&PyType_Type)
0,
"symtable entry",
sizeof(PySymtableEntryObject),
0,
(destructor)ste_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
(reprfunc)ste_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT, /* tp_flags */
0, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
ste_memberlist, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
0, /* tp_new */
};
|