/* Frame object interface */

#ifndef Py_FRAMEOBJECT_H

#define Py_FRAMEOBJECT_H

#ifdef __cplusplus

extern "C" {

#endif

typedef struct {

    int b_type;			/* what kind of block this is */

    int b_handler;		/* where to jump to find handler */

    int b_level;		/* value stack level to pop to */

} PyTryBlock;

typedef struct _frame {

    PyObject_VAR_HEAD

    struct _frame *f_back;	/* previous frame, or NULL */

    PyCodeObject *f_code;	/* code segment */

    PyObject *f_builtins;	/* builtin symbol table (PyDictObject) */

    PyObject *f_globals;	/* global symbol table (PyDictObject) */

    PyObject *f_locals;		/* local symbol table (any mapping) */

    PyObject **f_valuestack;	/* points after the last local */

    /* Next free slot in f_valuestack.  Frame creation sets to f_valuestack.

       Frame evaluation usually NULLs it, but a frame that yields sets it

       to the current stack top. */

    PyObject **f_stacktop;

    PyObject *f_trace;		/* Trace function */

    /* If an exception is raised in this frame, the next three are used to

     * record the exception info (if any) originally in the thread state.  See

     * comments before set_exc_info() -- it's not obvious.

     * Invariant:  if _type is NULL, then so are _value and _traceback.

     * Desired invariant:  all three are NULL, or all three are non-NULL.  That

     * one isn't currently true, but "should be".

     */

    PyObject *f_exc_type, *f_exc_value, *f_exc_traceback;

    PyThreadState *f_tstate;

    int f_lasti;		/* Last instruction if called */

    /* As of 2.3 f_lineno is only valid when tracing is active (i.e. when

       f_trace is set) -- at other times use PyCode_Addr2Line instead. */

    int f_lineno;		/* Current line number */

    int f_iblock;		/* index in f_blockstack */

    PyTryBlock f_blockstack[CO_MAXBLOCKS]; /* for try and loop blocks */

    PyObject *f_localsplus[1];	/* locals+stack, dynamically sized */

} PyFrameObject;

/* Standard object interface */

PyAPI_DATA(PyTypeObject) PyFrame_Type;

#define PyFrame_Check(op) ((op)->ob_type == &PyFrame_Type)

#define PyFrame_IsRestricted(f) \

	((f)->f_builtins != (f)->f_tstate->interp->builtins)

PyAPI_FUNC(PyFrameObject *) PyFrame_New(PyThreadState *, PyCodeObject *,

                                       PyObject *, PyObject *);

/* The rest of the interface is specific for frame objects */

/* Block management functions */

PyAPI_FUNC(void) PyFrame_BlockSetup(PyFrameObject *, int, int, int);

PyAPI_FUNC(PyTryBlock *) PyFrame_BlockPop(PyFrameObject *);

/* Extend the value stack */

PyAPI_FUNC(PyObject **) PyFrame_ExtendStack(PyFrameObject *, int, int);

/* Conversions between "fast locals" and locals in dictionary */

PyAPI_FUNC(void) PyFrame_LocalsToFast(PyFrameObject *, int);

PyAPI_FUNC(void) PyFrame_FastToLocals(PyFrameObject *);

PyAPI_FUNC(int) PyFrame_ClearFreeList(void);

#ifdef __cplusplus

}

#endif

#endif /* !Py_FRAMEOBJECT_H */