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python3.2  3.2.2
Defines | Functions | Variables
codeobject.c File Reference
#include "Python.h"
#include "code.h"
#include "structmember.h"

Go to the source code of this file.

Defines

#define NAME_CHARS   "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz"
#define OFF(x)   offsetof(PyCodeObject, x)

Functions

static int all_name_chars (Py_UNICODE *s)
static void intern_strings (PyObject *tuple)
PyCodeObjectPyCode_New (int argcount, int kwonlyargcount, int nlocals, int stacksize, int flags, PyObject *code, PyObject *consts, PyObject *names, PyObject *varnames, PyObject *freevars, PyObject *cellvars, PyObject *filename, PyObject *name, int firstlineno, PyObject *lnotab)
PyCodeObjectPyCode_NewEmpty (const char *filename, const char *funcname, int firstlineno)
static PyObjectvalidate_and_copy_tuple (PyObject *tup)
 PyDoc_STRVAR (code_doc,"code(argcount, kwonlyargcount, nlocals, stacksize, flags, codestring,\n\ constants, names, varnames, filename, name, firstlineno,\n\ lnotab[, freevars[, cellvars]])\n\ \n\ Create a code object. Not for the faint of heart.")
static PyObjectcode_new (PyTypeObject *type, PyObject *args, PyObject *kw)
static void code_dealloc (PyCodeObject *co)
static PyObjectcode_repr (PyCodeObject *co)
static PyObjectcode_richcompare (PyObject *self, PyObject *other, int op)
static Py_hash_t code_hash (PyCodeObject *co)
int PyCode_Addr2Line (PyCodeObject *co, int addrq)
int _PyCode_CheckLineNumber (PyCodeObject *co, int lasti, PyAddrPair *bounds)

Variables

static PyMemberDef code_memberlist []
PyTypeObject PyCode_Type

Define Documentation

#define NAME_CHARS   "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz"

Definition at line 5 of file codeobject.c.

#define OFF (   x)    offsetof(PyCodeObject, x)

Definition at line 164 of file codeobject.c.


Function Documentation

int _PyCode_CheckLineNumber ( PyCodeObject co,
int  lasti,
PyAddrPair bounds 
)

Definition at line 511 of file codeobject.c.

{
    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;
}

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static int all_name_chars ( Py_UNICODE s) [static]

Definition at line 11 of file codeobject.c.

{
    static char ok_name_char[256];
    static unsigned char *name_chars = (unsigned char *)NAME_CHARS;

    if (ok_name_char[*name_chars] == 0) {
        unsigned char *p;
        for (p = name_chars; *p; p++)
            ok_name_char[*p] = 1;
    }
    while (*s) {
        if (*s >= 128)
            return 0;
        if (ok_name_char[*s++] == 0)
            return 0;
    }
    return 1;
}

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static void code_dealloc ( PyCodeObject co) [static]

Definition at line 322 of file codeobject.c.

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static Py_hash_t code_hash ( PyCodeObject co) [static]

Definition at line 421 of file codeobject.c.

{
    Py_hash_t h, h0, h1, h2, h3, h4, h5, h6;
    h0 = PyObject_Hash(co->co_name);
    if (h0 == -1) return -1;
    h1 = PyObject_Hash(co->co_code);
    if (h1 == -1) return -1;
    h2 = PyObject_Hash(co->co_consts);
    if (h2 == -1) return -1;
    h3 = PyObject_Hash(co->co_names);
    if (h3 == -1) return -1;
    h4 = PyObject_Hash(co->co_varnames);
    if (h4 == -1) return -1;
    h5 = PyObject_Hash(co->co_freevars);
    if (h5 == -1) return -1;
    h6 = PyObject_Hash(co->co_cellvars);
    if (h6 == -1) return -1;
    h = h0 ^ h1 ^ h2 ^ h3 ^ h4 ^ h5 ^ h6 ^
        co->co_argcount ^ co->co_kwonlyargcount ^
        co->co_nlocals ^ co->co_flags;
    if (h == -1) h = -2;
    return h;
}

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static PyObject* code_new ( PyTypeObject type,
PyObject args,
PyObject kw 
) [static]

Definition at line 237 of file codeobject.c.

{
    int argcount;
    int kwonlyargcount;
    int nlocals;
    int stacksize;
    int flags;
    PyObject *co = NULL;
    PyObject *code;
    PyObject *consts;
    PyObject *names, *ournames = NULL;
    PyObject *varnames, *ourvarnames = NULL;
    PyObject *freevars = NULL, *ourfreevars = NULL;
    PyObject *cellvars = NULL, *ourcellvars = NULL;
    PyObject *filename;
    PyObject *name;
    int firstlineno;
    PyObject *lnotab;

    if (!PyArg_ParseTuple(args, "iiiiiSO!O!O!UUiS|O!O!:code",
                          &argcount, &kwonlyargcount,
                              &nlocals, &stacksize, &flags,
                          &code,
                          &PyTuple_Type, &consts,
                          &PyTuple_Type, &names,
                          &PyTuple_Type, &varnames,
                          &filename, &name,
                          &firstlineno, &lnotab,
                          &PyTuple_Type, &freevars,
                          &PyTuple_Type, &cellvars))
        return NULL;

    if (argcount < 0) {
        PyErr_SetString(
            PyExc_ValueError,
            "code: argcount must not be negative");
        goto cleanup;
    }

    if (kwonlyargcount < 0) {
        PyErr_SetString(
            PyExc_ValueError,
            "code: kwonlyargcount must not be negative");
        goto cleanup;
    }
    if (nlocals < 0) {
        PyErr_SetString(
            PyExc_ValueError,
            "code: nlocals must not be negative");
        goto cleanup;
    }

    ournames = validate_and_copy_tuple(names);
    if (ournames == NULL)
        goto cleanup;
    ourvarnames = validate_and_copy_tuple(varnames);
    if (ourvarnames == NULL)
        goto cleanup;
    if (freevars)
        ourfreevars = validate_and_copy_tuple(freevars);
    else
        ourfreevars = PyTuple_New(0);
    if (ourfreevars == NULL)
        goto cleanup;
    if (cellvars)
        ourcellvars = validate_and_copy_tuple(cellvars);
    else
        ourcellvars = PyTuple_New(0);
    if (ourcellvars == NULL)
        goto cleanup;

    co = (PyObject *)PyCode_New(argcount, kwonlyargcount,
                                nlocals, stacksize, flags,
                                code, consts, ournames, ourvarnames,
                                ourfreevars, ourcellvars, filename,
                                name, firstlineno, lnotab);
  cleanup:
    Py_XDECREF(ournames);
    Py_XDECREF(ourvarnames);
    Py_XDECREF(ourfreevars);
    Py_XDECREF(ourcellvars);
    return co;
}

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static PyObject* code_repr ( PyCodeObject co) [static]

Definition at line 341 of file codeobject.c.

{
    int lineno;
    if (co->co_firstlineno != 0)
        lineno = co->co_firstlineno;
    else
        lineno = -1;
    if (co->co_filename && PyUnicode_Check(co->co_filename)) {
        return PyUnicode_FromFormat(
            "<code object %U at %p, file \"%U\", line %d>",
            co->co_name, co, co->co_filename, lineno);
    } else {
        return PyUnicode_FromFormat(
            "<code object %U at %p, file ???, line %d>",
            co->co_name, co, lineno);
    }
}
static PyObject* code_richcompare ( PyObject self,
PyObject other,
int  op 
) [static]

Definition at line 360 of file codeobject.c.

{
    PyCodeObject *co, *cp;
    int eq;
    PyObject *res;

    if ((op != Py_EQ && op != Py_NE) ||
        !PyCode_Check(self) ||
        !PyCode_Check(other)) {
        Py_INCREF(Py_NotImplemented);
        return Py_NotImplemented;
    }

    co = (PyCodeObject *)self;
    cp = (PyCodeObject *)other;

    eq = PyObject_RichCompareBool(co->co_name, cp->co_name, Py_EQ);
    if (eq <= 0) goto unequal;
    eq = co->co_argcount == cp->co_argcount;
    if (!eq) goto unequal;
    eq = co->co_kwonlyargcount == cp->co_kwonlyargcount;
    if (!eq) goto unequal;
    eq = co->co_nlocals == cp->co_nlocals;
    if (!eq) goto unequal;
    eq = co->co_flags == cp->co_flags;
    if (!eq) goto unequal;
    eq = co->co_firstlineno == cp->co_firstlineno;
    if (!eq) goto unequal;
    eq = PyObject_RichCompareBool(co->co_code, cp->co_code, Py_EQ);
    if (eq <= 0) goto unequal;
    eq = PyObject_RichCompareBool(co->co_consts, cp->co_consts, Py_EQ);
    if (eq <= 0) goto unequal;
    eq = PyObject_RichCompareBool(co->co_names, cp->co_names, Py_EQ);
    if (eq <= 0) goto unequal;
    eq = PyObject_RichCompareBool(co->co_varnames, cp->co_varnames, Py_EQ);
    if (eq <= 0) goto unequal;
    eq = PyObject_RichCompareBool(co->co_freevars, cp->co_freevars, Py_EQ);
    if (eq <= 0) goto unequal;
    eq = PyObject_RichCompareBool(co->co_cellvars, cp->co_cellvars, Py_EQ);
    if (eq <= 0) goto unequal;

    if (op == Py_EQ)
        res = Py_True;
    else
        res = Py_False;
    goto done;

  unequal:
    if (eq < 0)
        return NULL;
    if (op == Py_NE)
        res = Py_True;
    else
        res = Py_False;

  done:
    Py_INCREF(res);
    return res;
}

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static void intern_strings ( PyObject tuple) [static]

Definition at line 31 of file codeobject.c.

{
    Py_ssize_t i;

    for (i = PyTuple_GET_SIZE(tuple); --i >= 0; ) {
        PyObject *v = PyTuple_GET_ITEM(tuple, i);
        if (v == NULL || !PyUnicode_CheckExact(v)) {
            Py_FatalError("non-string found in code slot");
        }
        PyUnicode_InternInPlace(&PyTuple_GET_ITEM(tuple, i));
    }
}

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int PyCode_Addr2Line ( PyCodeObject co,
int  addrq 
)

Definition at line 493 of file codeobject.c.

{
    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;
}

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PyCodeObject* PyCode_New ( int  argcount,
int  kwonlyargcount,
int  nlocals,
int  stacksize,
int  flags,
PyObject code,
PyObject consts,
PyObject names,
PyObject varnames,
PyObject freevars,
PyObject cellvars,
PyObject filename,
PyObject name,
int  firstlineno,
PyObject lnotab 
)

Definition at line 46 of file codeobject.c.

{
    PyCodeObject *co;
    Py_ssize_t i;

    /* Check argument types */
    if (argcount < 0 || kwonlyargcount < 0 || nlocals < 0 ||
        code == NULL ||
        consts == NULL || !PyTuple_Check(consts) ||
        names == NULL || !PyTuple_Check(names) ||
        varnames == NULL || !PyTuple_Check(varnames) ||
        freevars == NULL || !PyTuple_Check(freevars) ||
        cellvars == NULL || !PyTuple_Check(cellvars) ||
        name == NULL || !PyUnicode_Check(name) ||
        filename == NULL || !PyUnicode_Check(filename) ||
        lnotab == NULL || !PyBytes_Check(lnotab) ||
        !PyObject_CheckReadBuffer(code)) {
        PyErr_BadInternalCall();
        return NULL;
    }
    intern_strings(names);
    intern_strings(varnames);
    intern_strings(freevars);
    intern_strings(cellvars);
    /* Intern selected string constants */
    for (i = PyTuple_Size(consts); --i >= 0; ) {
        PyObject *v = PyTuple_GetItem(consts, i);
        if (!PyUnicode_Check(v))
            continue;
        if (!all_name_chars(PyUnicode_AS_UNICODE(v)))
            continue;
        PyUnicode_InternInPlace(&PyTuple_GET_ITEM(consts, i));
    }
    co = PyObject_NEW(PyCodeObject, &PyCode_Type);
    if (co != NULL) {
        co->co_argcount = argcount;
        co->co_kwonlyargcount = kwonlyargcount;
        co->co_nlocals = nlocals;
        co->co_stacksize = stacksize;
        co->co_flags = flags;
        Py_INCREF(code);
        co->co_code = code;
        Py_INCREF(consts);
        co->co_consts = consts;
        Py_INCREF(names);
        co->co_names = names;
        Py_INCREF(varnames);
        co->co_varnames = varnames;
        Py_INCREF(freevars);
        co->co_freevars = freevars;
        Py_INCREF(cellvars);
        co->co_cellvars = cellvars;
        Py_INCREF(filename);
        co->co_filename = filename;
        Py_INCREF(name);
        co->co_name = name;
        co->co_firstlineno = firstlineno;
        Py_INCREF(lnotab);
        co->co_lnotab = lnotab;
        co->co_zombieframe = NULL;
        co->co_weakreflist = NULL;
    }
    return co;
}

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PyCodeObject* PyCode_NewEmpty ( const char *  filename,
const char *  funcname,
int  firstlineno 
)

Definition at line 117 of file codeobject.c.

{
    static PyObject *emptystring = NULL;
    static PyObject *nulltuple = NULL;
    PyObject *filename_ob = NULL;
    PyObject *funcname_ob = NULL;
    PyCodeObject *result = NULL;
    if (emptystring == NULL) {
        emptystring = PyBytes_FromString("");
        if (emptystring == NULL)
            goto failed;
    }
    if (nulltuple == NULL) {
        nulltuple = PyTuple_New(0);
        if (nulltuple == NULL)
            goto failed;
    }
    funcname_ob = PyUnicode_FromString(funcname);
    if (funcname_ob == NULL)
        goto failed;
    filename_ob = PyUnicode_DecodeFSDefault(filename);
    if (filename_ob == NULL)
        goto failed;

    result = PyCode_New(0,                      /* argcount */
                0,                              /* kwonlyargcount */
                0,                              /* nlocals */
                0,                              /* stacksize */
                0,                              /* flags */
                emptystring,                    /* code */
                nulltuple,                      /* consts */
                nulltuple,                      /* names */
                nulltuple,                      /* varnames */
                nulltuple,                      /* freevars */
                nulltuple,                      /* cellvars */
                filename_ob,                    /* filename */
                funcname_ob,                    /* name */
                firstlineno,                    /* firstlineno */
                emptystring                     /* lnotab */
                );

failed:
    Py_XDECREF(funcname_ob);
    Py_XDECREF(filename_ob);
    return result;
}

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PyDoc_STRVAR ( code_doc  ,
"code(argcount, kwonlyargcount, nlocals, stacksize, flags, codestring,\n\ constants, names, varnames, filename, name, firstlineno,\n\ lnotab[, freevars[, cellvars]])\n\\n\Create a code object. Not for the faint of heart."   
)
static PyObject* validate_and_copy_tuple ( PyObject tup) [static]

Definition at line 189 of file codeobject.c.

{
    PyObject *newtuple;
    PyObject *item;
    Py_ssize_t i, len;

    len = PyTuple_GET_SIZE(tup);
    newtuple = PyTuple_New(len);
    if (newtuple == NULL)
        return NULL;

    for (i = 0; i < len; i++) {
        item = PyTuple_GET_ITEM(tup, i);
        if (PyUnicode_CheckExact(item)) {
            Py_INCREF(item);
        }
        else if (!PyUnicode_Check(item)) {
            PyErr_Format(
                PyExc_TypeError,
                "name tuples must contain only "
                "strings, not '%.500s'",
                item->ob_type->tp_name);
            Py_DECREF(newtuple);
            return NULL;
        }
        else {
            item = PyUnicode_FromUnicode(
                PyUnicode_AS_UNICODE(item),
                PyUnicode_GET_SIZE(item));
            if (item == NULL) {
                Py_DECREF(newtuple);
                return NULL;
            }
        }
        PyTuple_SET_ITEM(newtuple, i, item);
    }

    return newtuple;
}

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Variable Documentation

Initial value:
 {
    {"co_argcount",     T_INT,          OFF(co_argcount),       READONLY},
    {"co_kwonlyargcount",       T_INT,  OFF(co_kwonlyargcount), READONLY},
    {"co_nlocals",      T_INT,          OFF(co_nlocals),        READONLY},
    {"co_stacksize",T_INT,              OFF(co_stacksize),      READONLY},
    {"co_flags",        T_INT,          OFF(co_flags),          READONLY},
    {"co_code",         T_OBJECT,       OFF(co_code),           READONLY},
    {"co_consts",       T_OBJECT,       OFF(co_consts),         READONLY},
    {"co_names",        T_OBJECT,       OFF(co_names),          READONLY},
    {"co_varnames",     T_OBJECT,       OFF(co_varnames),       READONLY},
    {"co_freevars",     T_OBJECT,       OFF(co_freevars),       READONLY},
    {"co_cellvars",     T_OBJECT,       OFF(co_cellvars),       READONLY},
    {"co_filename",     T_OBJECT,       OFF(co_filename),       READONLY},
    {"co_name",         T_OBJECT,       OFF(co_name),           READONLY},
    {"co_firstlineno", T_INT,           OFF(co_firstlineno),    READONLY},
    {"co_lnotab",       T_OBJECT,       OFF(co_lnotab),         READONLY},
    {NULL}      
}

Definition at line 166 of file codeobject.c.

Definition at line 447 of file codeobject.c.