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#ifndef Py_INTERNAL_FRAME_H
#define Py_INTERNAL_FRAME_H
#ifdef __cplusplus
extern "C" {
#endif
#include <stdbool.h>
#include <stddef.h>
#include "pycore_code.h" // STATS
/* See Objects/frame_layout.md for an explanation of the frame stack
* including explanation of the PyFrameObject and _PyInterpreterFrame
* structs. */
struct _frame {
PyObject_HEAD
PyFrameObject *f_back; /* previous frame, or NULL */
struct _PyInterpreterFrame *f_frame; /* points to the frame data */
PyObject *f_trace; /* Trace function */
int f_lineno; /* Current line number. Only valid if non-zero */
char f_trace_lines; /* Emit per-line trace events? */
char f_trace_opcodes; /* Emit per-opcode trace events? */
char f_fast_as_locals; /* Have the fast locals of this frame been converted to a dict? */
/* The frame data, if this frame object owns the frame */
PyObject *_f_frame_data[1];
};
extern PyFrameObject* _PyFrame_New_NoTrack(PyCodeObject *code);
/* other API */
typedef enum _framestate {
FRAME_CREATED = -2,
FRAME_SUSPENDED = -1,
FRAME_EXECUTING = 0,
FRAME_COMPLETED = 1,
FRAME_CLEARED = 4
} PyFrameState;
#define FRAME_STATE_FINISHED(S) ((S) >= FRAME_COMPLETED)
enum _frameowner {
FRAME_OWNED_BY_THREAD = 0,
FRAME_OWNED_BY_GENERATOR = 1,
FRAME_OWNED_BY_FRAME_OBJECT = 2,
FRAME_OWNED_BY_CSTACK = 3,
};
typedef struct _PyInterpreterFrame {
PyCodeObject *f_code; /* Strong reference */
struct _PyInterpreterFrame *previous;
PyObject *f_funcobj; /* Strong reference. Only valid if not on C stack */
PyObject *f_globals; /* Borrowed reference. Only valid if not on C stack */
PyObject *f_builtins; /* Borrowed reference. Only valid if not on C stack */
PyObject *f_locals; /* Strong reference, may be NULL. Only valid if not on C stack */
PyFrameObject *frame_obj; /* Strong reference, may be NULL. Only valid if not on C stack */
// NOTE: This is not necessarily the last instruction started in the given
// frame. Rather, it is the code unit *prior to* the *next* instruction. For
// example, it may be an inline CACHE entry, an instruction we just jumped
// over, or (in the case of a newly-created frame) a totally invalid value:
_Py_CODEUNIT *prev_instr;
int stacktop; /* Offset of TOS from localsplus */
/* The return_offset determines where a `RETURN` should go in the caller,
* relative to `prev_instr`.
* It is only meaningful to the callee,
* so it needs to be set in any CALL (to a Python function)
* or SEND (to a coroutine or generator).
* If there is no callee, then it is meaningless. */
uint16_t return_offset;
char owner;
/* Locals and stack */
PyObject *localsplus[1];
} _PyInterpreterFrame;
#define _PyInterpreterFrame_LASTI(IF) \
((int)((IF)->prev_instr - _PyCode_CODE((IF)->f_code)))
static inline PyObject **_PyFrame_Stackbase(_PyInterpreterFrame *f) {
return f->localsplus + f->f_code->co_nlocalsplus;
}
static inline PyObject *_PyFrame_StackPeek(_PyInterpreterFrame *f) {
assert(f->stacktop > f->f_code->co_nlocalsplus);
assert(f->localsplus[f->stacktop-1] != NULL);
return f->localsplus[f->stacktop-1];
}
static inline PyObject *_PyFrame_StackPop(_PyInterpreterFrame *f) {
assert(f->stacktop > f->f_code->co_nlocalsplus);
f->stacktop--;
return f->localsplus[f->stacktop];
}
static inline void _PyFrame_StackPush(_PyInterpreterFrame *f, PyObject *value) {
f->localsplus[f->stacktop] = value;
f->stacktop++;
}
#define FRAME_SPECIALS_SIZE ((int)((sizeof(_PyInterpreterFrame)-1)/sizeof(PyObject *)))
static inline int
_PyFrame_NumSlotsForCodeObject(PyCodeObject *code)
{
/* This function needs to remain in sync with the calculation of
* co_framesize in Tools/build/deepfreeze.py */
assert(code->co_framesize >= FRAME_SPECIALS_SIZE);
return code->co_framesize - FRAME_SPECIALS_SIZE;
}
void _PyFrame_Copy(_PyInterpreterFrame *src, _PyInterpreterFrame *dest);
/* Consumes reference to func and locals.
Does not initialize frame->previous, which happens
when frame is linked into the frame stack.
*/
static inline void
_PyFrame_Initialize(
_PyInterpreterFrame *frame, PyFunctionObject *func,
PyObject *locals, PyCodeObject *code, int null_locals_from)
{
frame->f_funcobj = (PyObject *)func;
frame->f_code = (PyCodeObject *)Py_NewRef(code);
frame->f_builtins = func->func_builtins;
frame->f_globals = func->func_globals;
frame->f_locals = locals;
frame->stacktop = code->co_nlocalsplus;
frame->frame_obj = NULL;
frame->prev_instr = _PyCode_CODE(code) - 1;
frame->return_offset = 0;
frame->owner = FRAME_OWNED_BY_THREAD;
for (int i = null_locals_from; i < code->co_nlocalsplus; i++) {
frame->localsplus[i] = NULL;
}
}
/* Gets the pointer to the locals array
* that precedes this frame.
*/
static inline PyObject**
_PyFrame_GetLocalsArray(_PyInterpreterFrame *frame)
{
return frame->localsplus;
}
/* Fetches the stack pointer, and sets stacktop to -1.
Having stacktop <= 0 ensures that invalid
values are not visible to the cycle GC.
We choose -1 rather than 0 to assist debugging. */
static inline PyObject**
_PyFrame_GetStackPointer(_PyInterpreterFrame *frame)
{
PyObject **sp = frame->localsplus + frame->stacktop;
frame->stacktop = -1;
return sp;
}
static inline void
_PyFrame_SetStackPointer(_PyInterpreterFrame *frame, PyObject **stack_pointer)
{
frame->stacktop = (int)(stack_pointer - frame->localsplus);
}
/* Determine whether a frame is incomplete.
* A frame is incomplete if it is part way through
* creating cell objects or a generator or coroutine.
*
* Frames on the frame stack are incomplete until the
* first RESUME instruction.
* Frames owned by a generator are always complete.
*/
static inline bool
_PyFrame_IsIncomplete(_PyInterpreterFrame *frame)
{
return frame->owner != FRAME_OWNED_BY_GENERATOR &&
frame->prev_instr < _PyCode_CODE(frame->f_code) + frame->f_code->_co_firsttraceable;
}
static inline _PyInterpreterFrame *
_PyFrame_GetFirstComplete(_PyInterpreterFrame *frame)
{
while (frame && _PyFrame_IsIncomplete(frame)) {
frame = frame->previous;
}
return frame;
}
static inline _PyInterpreterFrame *
_PyThreadState_GetFrame(PyThreadState *tstate)
{
return _PyFrame_GetFirstComplete(tstate->cframe->current_frame);
}
/* For use by _PyFrame_GetFrameObject
Do not call directly. */
PyFrameObject *
_PyFrame_MakeAndSetFrameObject(_PyInterpreterFrame *frame);
/* Gets the PyFrameObject for this frame, lazily
* creating it if necessary.
* Returns a borrowed referennce */
static inline PyFrameObject *
_PyFrame_GetFrameObject(_PyInterpreterFrame *frame)
{
assert(!_PyFrame_IsIncomplete(frame));
PyFrameObject *res = frame->frame_obj;
if (res != NULL) {
return res;
}
return _PyFrame_MakeAndSetFrameObject(frame);
}
/* Clears all references in the frame.
* If take is non-zero, then the _PyInterpreterFrame frame
* may be transferred to the frame object it references
* instead of being cleared. Either way
* the caller no longer owns the references
* in the frame.
* take should be set to 1 for heap allocated
* frames like the ones in generators and coroutines.
*/
void
_PyFrame_ClearExceptCode(_PyInterpreterFrame * frame);
int
_PyFrame_Traverse(_PyInterpreterFrame *frame, visitproc visit, void *arg);
PyObject *
_PyFrame_GetLocals(_PyInterpreterFrame *frame, int include_hidden);
int
_PyFrame_FastToLocalsWithError(_PyInterpreterFrame *frame);
void
_PyFrame_LocalsToFast(_PyInterpreterFrame *frame, int clear);
static inline bool
_PyThreadState_HasStackSpace(PyThreadState *tstate, int size)
{
assert(
(tstate->datastack_top == NULL && tstate->datastack_limit == NULL)
||
(tstate->datastack_top != NULL && tstate->datastack_limit != NULL)
);
return tstate->datastack_top != NULL &&
size < tstate->datastack_limit - tstate->datastack_top;
}
extern _PyInterpreterFrame *
_PyThreadState_PushFrame(PyThreadState *tstate, size_t size);
void _PyThreadState_PopFrame(PyThreadState *tstate, _PyInterpreterFrame *frame);
/* Pushes a frame without checking for space.
* Must be guarded by _PyThreadState_HasStackSpace()
* Consumes reference to func. */
static inline _PyInterpreterFrame *
_PyFrame_PushUnchecked(PyThreadState *tstate, PyFunctionObject *func, int null_locals_from)
{
CALL_STAT_INC(frames_pushed);
PyCodeObject *code = (PyCodeObject *)func->func_code;
_PyInterpreterFrame *new_frame = (_PyInterpreterFrame *)tstate->datastack_top;
tstate->datastack_top += code->co_framesize;
assert(tstate->datastack_top < tstate->datastack_limit);
_PyFrame_Initialize(new_frame, func, NULL, code, null_locals_from);
return new_frame;
}
static inline
PyGenObject *_PyFrame_GetGenerator(_PyInterpreterFrame *frame)
{
assert(frame->owner == FRAME_OWNED_BY_GENERATOR);
size_t offset_in_gen = offsetof(PyGenObject, gi_iframe);
return (PyGenObject *)(((char *)frame) - offset_in_gen);
}
#ifdef __cplusplus
}
#endif
#endif /* !Py_INTERNAL_FRAME_H */