Staging
v0.5.1
v0.5.1
Revision 724ef20e24b8c5b8bce394f70c3eddf3540ebb42 authored by Anthony Baxter on 25 January 2005, 13:08:15 UTC, committed by Anthony Baxter on 25 January 2005, 13:08:15 UTC
1 parent c859084
symtable.c
#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:
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 */
};
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