594 lines
19 KiB
C
594 lines
19 KiB
C
#include "Python.h"
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#include "code.h"
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#include "structmember.h"
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#define NAME_CHARS \
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"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz"
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/* all_name_chars(s): true iff all chars in s are valid NAME_CHARS */
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static int
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all_name_chars(PyObject *o)
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{
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static char ok_name_char[256];
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static unsigned char *name_chars = (unsigned char *)NAME_CHARS;
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PyUnicodeObject *u = (PyUnicodeObject *)o;
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const unsigned char *s;
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if (!PyUnicode_Check(o) || PyUnicode_READY(u) == -1 ||
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PyUnicode_MAX_CHAR_VALUE(u) >= 128)
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return 0;
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if (ok_name_char[*name_chars] == 0) {
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unsigned char *p;
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for (p = name_chars; *p; p++)
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ok_name_char[*p] = 1;
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}
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s = PyUnicode_1BYTE_DATA(u);
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while (*s) {
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if (ok_name_char[*s++] == 0)
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return 0;
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}
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return 1;
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}
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static void
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intern_strings(PyObject *tuple)
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{
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Py_ssize_t i;
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for (i = PyTuple_GET_SIZE(tuple); --i >= 0; ) {
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PyObject *v = PyTuple_GET_ITEM(tuple, i);
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if (v == NULL || !PyUnicode_CheckExact(v)) {
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Py_FatalError("non-string found in code slot");
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}
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PyUnicode_InternInPlace(&PyTuple_GET_ITEM(tuple, i));
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}
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}
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PyCodeObject *
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PyCode_New(int argcount, int kwonlyargcount,
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int nlocals, int stacksize, int flags,
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PyObject *code, PyObject *consts, PyObject *names,
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PyObject *varnames, PyObject *freevars, PyObject *cellvars,
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PyObject *filename, PyObject *name, int firstlineno,
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PyObject *lnotab)
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{
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PyCodeObject *co;
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unsigned char *cell2arg = NULL;
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Py_ssize_t i, n_cellvars;
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/* Check argument types */
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if (argcount < 0 || kwonlyargcount < 0 || nlocals < 0 ||
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code == NULL ||
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consts == NULL || !PyTuple_Check(consts) ||
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names == NULL || !PyTuple_Check(names) ||
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varnames == NULL || !PyTuple_Check(varnames) ||
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freevars == NULL || !PyTuple_Check(freevars) ||
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cellvars == NULL || !PyTuple_Check(cellvars) ||
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name == NULL || !PyUnicode_Check(name) ||
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filename == NULL || !PyUnicode_Check(filename) ||
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lnotab == NULL || !PyBytes_Check(lnotab) ||
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!PyObject_CheckReadBuffer(code)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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n_cellvars = PyTuple_GET_SIZE(cellvars);
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intern_strings(names);
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intern_strings(varnames);
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intern_strings(freevars);
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intern_strings(cellvars);
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/* Intern selected string constants */
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for (i = PyTuple_GET_SIZE(consts); --i >= 0; ) {
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PyObject *v = PyTuple_GetItem(consts, i);
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if (!all_name_chars(v))
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continue;
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PyUnicode_InternInPlace(&PyTuple_GET_ITEM(consts, i));
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}
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/* Create mapping between cells and arguments if needed. */
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if (n_cellvars) {
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Py_ssize_t total_args = argcount + kwonlyargcount +
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((flags & CO_VARARGS) != 0) + ((flags & CO_VARKEYWORDS) != 0);
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Py_ssize_t alloc_size = sizeof(unsigned char) * n_cellvars;
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int used_cell2arg = 0;
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cell2arg = PyMem_MALLOC(alloc_size);
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if (cell2arg == NULL)
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return NULL;
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memset(cell2arg, CO_CELL_NOT_AN_ARG, alloc_size);
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/* Find cells which are also arguments. */
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for (i = 0; i < n_cellvars; i++) {
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Py_ssize_t j;
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PyObject *cell = PyTuple_GET_ITEM(cellvars, i);
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for (j = 0; j < total_args; j++) {
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PyObject *arg = PyTuple_GET_ITEM(varnames, j);
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if (!PyUnicode_Compare(cell, arg)) {
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cell2arg[i] = j;
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used_cell2arg = 1;
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break;
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}
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}
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}
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if (!used_cell2arg) {
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PyMem_FREE(cell2arg);
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cell2arg = NULL;
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}
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}
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co = PyObject_NEW(PyCodeObject, &PyCode_Type);
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if (co == NULL) {
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if (cell2arg)
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PyMem_FREE(cell2arg);
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return NULL;
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}
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co->co_argcount = argcount;
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co->co_kwonlyargcount = kwonlyargcount;
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co->co_nlocals = nlocals;
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co->co_stacksize = stacksize;
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co->co_flags = flags;
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Py_INCREF(code);
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co->co_code = code;
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Py_INCREF(consts);
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co->co_consts = consts;
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Py_INCREF(names);
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co->co_names = names;
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Py_INCREF(varnames);
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co->co_varnames = varnames;
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Py_INCREF(freevars);
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co->co_freevars = freevars;
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Py_INCREF(cellvars);
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co->co_cellvars = cellvars;
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co->co_cell2arg = cell2arg;
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Py_INCREF(filename);
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co->co_filename = filename;
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Py_INCREF(name);
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co->co_name = name;
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co->co_firstlineno = firstlineno;
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Py_INCREF(lnotab);
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co->co_lnotab = lnotab;
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co->co_zombieframe = NULL;
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co->co_weakreflist = NULL;
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return co;
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}
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PyCodeObject *
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PyCode_NewEmpty(const char *filename, const char *funcname, int firstlineno)
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{
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static PyObject *emptystring = NULL;
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static PyObject *nulltuple = NULL;
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PyObject *filename_ob = NULL;
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PyObject *funcname_ob = NULL;
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PyCodeObject *result = NULL;
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if (emptystring == NULL) {
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emptystring = PyBytes_FromString("");
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if (emptystring == NULL)
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goto failed;
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}
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if (nulltuple == NULL) {
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nulltuple = PyTuple_New(0);
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if (nulltuple == NULL)
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goto failed;
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}
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funcname_ob = PyUnicode_FromString(funcname);
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if (funcname_ob == NULL)
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goto failed;
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filename_ob = PyUnicode_DecodeFSDefault(filename);
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if (filename_ob == NULL)
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goto failed;
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result = PyCode_New(0, /* argcount */
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0, /* kwonlyargcount */
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0, /* nlocals */
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0, /* stacksize */
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0, /* flags */
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emptystring, /* code */
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nulltuple, /* consts */
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nulltuple, /* names */
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nulltuple, /* varnames */
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nulltuple, /* freevars */
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nulltuple, /* cellvars */
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filename_ob, /* filename */
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funcname_ob, /* name */
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firstlineno, /* firstlineno */
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emptystring /* lnotab */
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);
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failed:
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Py_XDECREF(funcname_ob);
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Py_XDECREF(filename_ob);
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return result;
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}
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#define OFF(x) offsetof(PyCodeObject, x)
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static PyMemberDef code_memberlist[] = {
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{"co_argcount", T_INT, OFF(co_argcount), READONLY},
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{"co_kwonlyargcount", T_INT, OFF(co_kwonlyargcount), READONLY},
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{"co_nlocals", T_INT, OFF(co_nlocals), READONLY},
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{"co_stacksize",T_INT, OFF(co_stacksize), READONLY},
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{"co_flags", T_INT, OFF(co_flags), READONLY},
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{"co_code", T_OBJECT, OFF(co_code), READONLY},
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{"co_consts", T_OBJECT, OFF(co_consts), READONLY},
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{"co_names", T_OBJECT, OFF(co_names), READONLY},
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{"co_varnames", T_OBJECT, OFF(co_varnames), READONLY},
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{"co_freevars", T_OBJECT, OFF(co_freevars), READONLY},
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{"co_cellvars", T_OBJECT, OFF(co_cellvars), READONLY},
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{"co_filename", T_OBJECT, OFF(co_filename), READONLY},
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{"co_name", T_OBJECT, OFF(co_name), READONLY},
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{"co_firstlineno", T_INT, OFF(co_firstlineno), READONLY},
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{"co_lnotab", T_OBJECT, OFF(co_lnotab), READONLY},
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{NULL} /* Sentinel */
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};
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/* Helper for code_new: return a shallow copy of a tuple that is
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guaranteed to contain exact strings, by converting string subclasses
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to exact strings and complaining if a non-string is found. */
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static PyObject*
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validate_and_copy_tuple(PyObject *tup)
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{
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PyObject *newtuple;
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PyObject *item;
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Py_ssize_t i, len;
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len = PyTuple_GET_SIZE(tup);
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newtuple = PyTuple_New(len);
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if (newtuple == NULL)
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return NULL;
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for (i = 0; i < len; i++) {
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item = PyTuple_GET_ITEM(tup, i);
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if (PyUnicode_CheckExact(item)) {
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Py_INCREF(item);
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}
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else if (!PyUnicode_Check(item)) {
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PyErr_Format(
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PyExc_TypeError,
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"name tuples must contain only "
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"strings, not '%.500s'",
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item->ob_type->tp_name);
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Py_DECREF(newtuple);
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return NULL;
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}
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else {
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item = _PyUnicode_Copy(item);
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if (item == NULL) {
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Py_DECREF(newtuple);
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return NULL;
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}
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}
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PyTuple_SET_ITEM(newtuple, i, item);
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}
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return newtuple;
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}
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PyDoc_STRVAR(code_doc,
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"code(argcount, kwonlyargcount, nlocals, stacksize, flags, codestring,\n\
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constants, names, varnames, filename, name, firstlineno,\n\
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lnotab[, freevars[, cellvars]])\n\
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\n\
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Create a code object. Not for the faint of heart.");
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static PyObject *
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code_new(PyTypeObject *type, PyObject *args, PyObject *kw)
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{
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int argcount;
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int kwonlyargcount;
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int nlocals;
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int stacksize;
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int flags;
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PyObject *co = NULL;
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PyObject *code;
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PyObject *consts;
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PyObject *names, *ournames = NULL;
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PyObject *varnames, *ourvarnames = NULL;
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PyObject *freevars = NULL, *ourfreevars = NULL;
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PyObject *cellvars = NULL, *ourcellvars = NULL;
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PyObject *filename;
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PyObject *name;
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int firstlineno;
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PyObject *lnotab;
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if (!PyArg_ParseTuple(args, "iiiiiSO!O!O!UUiS|O!O!:code",
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&argcount, &kwonlyargcount,
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&nlocals, &stacksize, &flags,
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&code,
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&PyTuple_Type, &consts,
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&PyTuple_Type, &names,
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&PyTuple_Type, &varnames,
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&filename, &name,
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&firstlineno, &lnotab,
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&PyTuple_Type, &freevars,
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&PyTuple_Type, &cellvars))
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return NULL;
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if (argcount < 0) {
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PyErr_SetString(
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PyExc_ValueError,
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"code: argcount must not be negative");
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goto cleanup;
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}
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if (kwonlyargcount < 0) {
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PyErr_SetString(
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PyExc_ValueError,
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"code: kwonlyargcount must not be negative");
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goto cleanup;
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}
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if (nlocals < 0) {
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PyErr_SetString(
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PyExc_ValueError,
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"code: nlocals must not be negative");
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goto cleanup;
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}
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ournames = validate_and_copy_tuple(names);
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if (ournames == NULL)
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goto cleanup;
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ourvarnames = validate_and_copy_tuple(varnames);
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if (ourvarnames == NULL)
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goto cleanup;
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if (freevars)
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ourfreevars = validate_and_copy_tuple(freevars);
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else
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ourfreevars = PyTuple_New(0);
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if (ourfreevars == NULL)
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goto cleanup;
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if (cellvars)
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ourcellvars = validate_and_copy_tuple(cellvars);
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else
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ourcellvars = PyTuple_New(0);
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if (ourcellvars == NULL)
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goto cleanup;
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co = (PyObject *)PyCode_New(argcount, kwonlyargcount,
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nlocals, stacksize, flags,
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code, consts, ournames, ourvarnames,
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ourfreevars, ourcellvars, filename,
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name, firstlineno, lnotab);
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cleanup:
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Py_XDECREF(ournames);
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Py_XDECREF(ourvarnames);
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Py_XDECREF(ourfreevars);
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Py_XDECREF(ourcellvars);
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return co;
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}
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static void
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code_dealloc(PyCodeObject *co)
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{
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Py_XDECREF(co->co_code);
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Py_XDECREF(co->co_consts);
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Py_XDECREF(co->co_names);
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Py_XDECREF(co->co_varnames);
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Py_XDECREF(co->co_freevars);
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Py_XDECREF(co->co_cellvars);
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Py_XDECREF(co->co_filename);
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Py_XDECREF(co->co_name);
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Py_XDECREF(co->co_lnotab);
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if (co->co_cell2arg != NULL)
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PyMem_FREE(co->co_cell2arg);
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if (co->co_zombieframe != NULL)
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PyObject_GC_Del(co->co_zombieframe);
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if (co->co_weakreflist != NULL)
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PyObject_ClearWeakRefs((PyObject*)co);
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PyObject_DEL(co);
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}
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static PyObject *
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code_repr(PyCodeObject *co)
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{
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int lineno;
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if (co->co_firstlineno != 0)
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lineno = co->co_firstlineno;
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else
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lineno = -1;
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if (co->co_filename && PyUnicode_Check(co->co_filename)) {
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return PyUnicode_FromFormat(
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"<code object %U at %p, file \"%U\", line %d>",
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co->co_name, co, co->co_filename, lineno);
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} else {
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return PyUnicode_FromFormat(
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"<code object %U at %p, file ???, line %d>",
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co->co_name, co, lineno);
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}
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}
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static PyObject *
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code_richcompare(PyObject *self, PyObject *other, int op)
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{
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PyCodeObject *co, *cp;
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int eq;
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PyObject *res;
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if ((op != Py_EQ && op != Py_NE) ||
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!PyCode_Check(self) ||
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!PyCode_Check(other)) {
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Py_RETURN_NOTIMPLEMENTED;
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}
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co = (PyCodeObject *)self;
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cp = (PyCodeObject *)other;
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eq = PyObject_RichCompareBool(co->co_name, cp->co_name, Py_EQ);
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if (eq <= 0) goto unequal;
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eq = co->co_argcount == cp->co_argcount;
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if (!eq) goto unequal;
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eq = co->co_kwonlyargcount == cp->co_kwonlyargcount;
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if (!eq) goto unequal;
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eq = co->co_nlocals == cp->co_nlocals;
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if (!eq) goto unequal;
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eq = co->co_flags == cp->co_flags;
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if (!eq) goto unequal;
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eq = co->co_firstlineno == cp->co_firstlineno;
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if (!eq) goto unequal;
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eq = PyObject_RichCompareBool(co->co_code, cp->co_code, Py_EQ);
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if (eq <= 0) goto unequal;
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eq = PyObject_RichCompareBool(co->co_consts, cp->co_consts, Py_EQ);
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if (eq <= 0) goto unequal;
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eq = PyObject_RichCompareBool(co->co_names, cp->co_names, Py_EQ);
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if (eq <= 0) goto unequal;
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eq = PyObject_RichCompareBool(co->co_varnames, cp->co_varnames, Py_EQ);
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if (eq <= 0) goto unequal;
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eq = PyObject_RichCompareBool(co->co_freevars, cp->co_freevars, Py_EQ);
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if (eq <= 0) goto unequal;
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eq = PyObject_RichCompareBool(co->co_cellvars, cp->co_cellvars, Py_EQ);
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if (eq <= 0) goto unequal;
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if (op == Py_EQ)
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res = Py_True;
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else
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res = Py_False;
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goto done;
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unequal:
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if (eq < 0)
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return NULL;
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if (op == Py_NE)
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res = Py_True;
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else
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res = Py_False;
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done:
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Py_INCREF(res);
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return res;
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}
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static Py_hash_t
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code_hash(PyCodeObject *co)
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{
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Py_hash_t h, h0, h1, h2, h3, h4, h5, h6;
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h0 = PyObject_Hash(co->co_name);
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if (h0 == -1) return -1;
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h1 = PyObject_Hash(co->co_code);
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if (h1 == -1) return -1;
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h2 = PyObject_Hash(co->co_consts);
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if (h2 == -1) return -1;
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h3 = PyObject_Hash(co->co_names);
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if (h3 == -1) return -1;
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h4 = PyObject_Hash(co->co_varnames);
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if (h4 == -1) return -1;
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h5 = PyObject_Hash(co->co_freevars);
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if (h5 == -1) return -1;
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h6 = PyObject_Hash(co->co_cellvars);
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if (h6 == -1) return -1;
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h = h0 ^ h1 ^ h2 ^ h3 ^ h4 ^ h5 ^ h6 ^
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co->co_argcount ^ co->co_kwonlyargcount ^
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co->co_nlocals ^ co->co_flags;
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if (h == -1) h = -2;
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return h;
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}
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/* XXX code objects need to participate in GC? */
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PyTypeObject PyCode_Type = {
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PyVarObject_HEAD_INIT(&PyType_Type, 0)
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"code",
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sizeof(PyCodeObject),
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0,
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(destructor)code_dealloc, /* tp_dealloc */
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0, /* tp_print */
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0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
0, /* tp_reserved */
|
|
(reprfunc)code_repr, /* tp_repr */
|
|
0, /* tp_as_number */
|
|
0, /* tp_as_sequence */
|
|
0, /* tp_as_mapping */
|
|
(hashfunc)code_hash, /* tp_hash */
|
|
0, /* tp_call */
|
|
0, /* tp_str */
|
|
PyObject_GenericGetAttr, /* tp_getattro */
|
|
0, /* tp_setattro */
|
|
0, /* tp_as_buffer */
|
|
Py_TPFLAGS_DEFAULT, /* tp_flags */
|
|
code_doc, /* tp_doc */
|
|
0, /* tp_traverse */
|
|
0, /* tp_clear */
|
|
code_richcompare, /* tp_richcompare */
|
|
offsetof(PyCodeObject, co_weakreflist), /* tp_weaklistoffset */
|
|
0, /* tp_iter */
|
|
0, /* tp_iternext */
|
|
0, /* tp_methods */
|
|
code_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 */
|
|
code_new, /* tp_new */
|
|
};
|
|
|
|
/* Use co_lnotab to compute the line number from a bytecode index, addrq. See
|
|
lnotab_notes.txt for the details of the lnotab representation.
|
|
*/
|
|
|
|
int
|
|
PyCode_Addr2Line(PyCodeObject *co, int addrq)
|
|
{
|
|
Py_ssize_t size = PyBytes_Size(co->co_lnotab) / 2;
|
|
unsigned char *p = (unsigned char*)PyBytes_AsString(co->co_lnotab);
|
|
int line = co->co_firstlineno;
|
|
int addr = 0;
|
|
while (--size >= 0) {
|
|
addr += *p++;
|
|
if (addr > addrq)
|
|
break;
|
|
line += *p++;
|
|
}
|
|
return line;
|
|
}
|
|
|
|
/* Update *bounds to describe the first and one-past-the-last instructions in
|
|
the same line as lasti. Return the number of that line. */
|
|
int
|
|
_PyCode_CheckLineNumber(PyCodeObject* co, int lasti, PyAddrPair *bounds)
|
|
{
|
|
Py_ssize_t size;
|
|
int addr, line;
|
|
unsigned char* p;
|
|
|
|
p = (unsigned char*)PyBytes_AS_STRING(co->co_lnotab);
|
|
size = PyBytes_GET_SIZE(co->co_lnotab) / 2;
|
|
|
|
addr = 0;
|
|
line = co->co_firstlineno;
|
|
assert(line > 0);
|
|
|
|
/* possible optimization: if f->f_lasti == instr_ub
|
|
(likely to be a common case) then we already know
|
|
instr_lb -- if we stored the matching value of p
|
|
somwhere we could skip the first while loop. */
|
|
|
|
/* See lnotab_notes.txt for the description of
|
|
co_lnotab. A point to remember: increments to p
|
|
come in (addr, line) pairs. */
|
|
|
|
bounds->ap_lower = 0;
|
|
while (size > 0) {
|
|
if (addr + *p > lasti)
|
|
break;
|
|
addr += *p++;
|
|
if (*p)
|
|
bounds->ap_lower = addr;
|
|
line += *p++;
|
|
--size;
|
|
}
|
|
|
|
if (size > 0) {
|
|
while (--size >= 0) {
|
|
addr += *p++;
|
|
if (*p++)
|
|
break;
|
|
}
|
|
bounds->ap_upper = addr;
|
|
}
|
|
else {
|
|
bounds->ap_upper = INT_MAX;
|
|
}
|
|
|
|
return line;
|
|
}
|