Code Objects
************

Code objects are a low-level detail of the CPython implementation.
Each one represents a chunk of executable code that hasn’t yet been
bound into a function.

type PyCodeObject

   The C structure of the objects used to describe code objects.  The
   fields of this type are subject to change at any time.

PyTypeObject PyCode_Type

   This is an instance of "PyTypeObject" representing the Python
   "code" type.

int PyCode_Check(PyObject *co)

   Return true if *co* is a "code" object.  This function always
   succeeds.

int PyCode_GetNumFree(PyCodeObject *co)

   Return the number of free variables in *co*.

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 *linetable, PyObject *exceptiontable)
    *Return value: New reference.*

   Return a new code object.  If you need a dummy code object to
   create a frame, use "PyCode_NewEmpty()" instead.  Calling
   "PyCode_New()" directly will bind you to a precise Python version
   since the definition of the bytecode changes often. The many
   arguments of this function are inter-dependent in complex ways,
   meaning that subtle changes to values are likely to result in
   incorrect execution or VM crashes. Use this function only with
   extreme care.

   Changed in version 3.11: Added "exceptiontable" parameter.

PyCodeObject *PyCode_NewWithPosOnlyArgs(int argcount, int posonlyargcount, 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 *linetable, PyObject *exceptiontable)
    *Return value: New reference.*

   Similar to "PyCode_New()", but with an extra “posonlyargcount” for
   positional-only arguments. The same caveats that apply to
   "PyCode_New" also apply to this function.

   New in version 3.8.

   Changed in version 3.11: Added "exceptiontable" parameter.

PyCodeObject *PyCode_NewEmpty(const char *filename, const char *funcname, int firstlineno)
    *Return value: New reference.*

   Return a new empty code object with the specified filename,
   function name, and first line number. The resulting code object
   will raise an "Exception" if executed.

int PyCode_Addr2Line(PyCodeObject *co, int byte_offset)

   Return the line number of the instruction that occurs on or before
   "byte_offset" and ends after it. If you just need the line number
   of a frame, use "PyFrame_GetLineNumber()" instead.

   For efficiently iterating over the line numbers in a code object,
   use the API described in PEP 626.

int PyCode_Addr2Location(PyObject *co, int byte_offset, int *start_line, int *start_column, int *end_line, int *end_column)

   Sets the passed "int" pointers to the source code line and column
   numbers for the instruction at "byte_offset". Sets the value to "0"
   when information is not available for any particular element.

   Returns "1" if the function succeeds and 0 otherwise.

   New in version 3.11.

PyObject *PyCode_GetCode(PyCodeObject *co)

   Equivalent to the Python code "getattr(co, 'co_code')". Returns a
   strong reference to a "PyBytesObject" representing the bytecode in
   a code object. On error, "NULL" is returned and an exception is
   raised.

   This "PyBytesObject" may be created on-demand by the interpreter
   and does not necessarily represent the bytecode actually executed
   by CPython. The primary use case for this function is debuggers and
   profilers.

   New in version 3.11.

PyObject *PyCode_GetVarnames(PyCodeObject *co)

   Equivalent to the Python code "getattr(co, 'co_varnames')". Returns
   a new reference to a "PyTupleObject" containing the names of the
   local variables. On error, "NULL" is returned and an exception is
   raised.

   New in version 3.11.

PyObject *PyCode_GetCellvars(PyCodeObject *co)

   Equivalent to the Python code "getattr(co, 'co_cellvars')". Returns
   a new reference to a "PyTupleObject" containing the names of the
   local variables that are referenced by nested functions. On error,
   "NULL" is returned and an exception is raised.

   New in version 3.11.

PyObject *PyCode_GetFreevars(PyCodeObject *co)

   Equivalent to the Python code "getattr(co, 'co_freevars')". Returns
   a new reference to a "PyTupleObject" containing the names of the
   free variables. On error, "NULL" is returned and an exception is
   raised.

   New in version 3.11.
