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/* 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 */

/* Call PyFrame_GetLineNumber() instead of reading this field

directly. As of 2.3 f_lineno is only valid when tracing is

active (i.e. when f_trace is set). At other times we use

PyCode_Addr2Line to calculate the line from the current

bytecode index. */

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);

/* Return the line of code the frame is currently executing. */

PyAPI_FUNC(int) PyFrame_GetLineNumber(PyFrameObject *);

#ifdef __cplusplus

}

#endif

#endif /* !Py_FRAMEOBJECT_H */

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