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bpo-39947: Move Py_EnterRecursiveCall() to internal C API (GH-18972)

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Move the static inline function flavor of Py_EnterRecursiveCall() and
Py_LeaveRecursiveCall() to the internal C API: they access
PyThreadState attributes. The limited C API provides regular
functions which hide implementation details.
This commit is contained in:
Victor Stinner 2020-03-13 10:19:38 +01:00 • committed by GitHub
parent 0b72b23fb0
commit 224481a8c9
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7 changed files with 68 additions and 56 deletions
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60
Include/internal/pycore_ceval.h
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@ -56,6 +56,66 @@ extern PyObject *_PyEval_EvalCode(
extern int _PyEval_ThreadsInitialized(_PyRuntimeState *runtime);
extern PyStatus _PyEval_InitThreads(PyThreadState *tstate);
/* --- _Py_EnterRecursiveCall() ----------------------------------------- */
PyAPI_DATA(int) _Py_CheckRecursionLimit;
#ifdef USE_STACKCHECK
/* With USE_STACKCHECK macro defined, trigger stack checks in
_Py_CheckRecursiveCall() on every 64th call to Py_EnterRecursiveCall. */
static inline int _Py_MakeRecCheck(PyThreadState *tstate) {
return (++tstate->recursion_depth > _Py_CheckRecursionLimit
|| ++tstate->stackcheck_counter > 64);
}
#else
static inline int _Py_MakeRecCheck(PyThreadState *tstate) {
return (++tstate->recursion_depth > _Py_CheckRecursionLimit);
}
#endif
PyAPI_FUNC(int) _Py_CheckRecursiveCall(
PyThreadState *tstate,
const char *where);
static inline int _Py_EnterRecursiveCall(PyThreadState *tstate,
const char *where) {
return (_Py_MakeRecCheck(tstate) && _Py_CheckRecursiveCall(tstate, where));
}
static inline int _Py_EnterRecursiveCall_inline(const char *where) {
PyThreadState *tstate = PyThreadState_GET();
return _Py_EnterRecursiveCall(tstate, where);
}
#define Py_EnterRecursiveCall(where) _Py_EnterRecursiveCall_inline(where)
/* Compute the "lower-water mark" for a recursion limit. When
* Py_LeaveRecursiveCall() is called with a recursion depth below this mark,
* the overflowed flag is reset to 0. */
#define _Py_RecursionLimitLowerWaterMark(limit) \
(((limit) > 200) \
? ((limit) - 50) \
: (3 * ((limit) >> 2)))
#define _Py_MakeEndRecCheck(x) \
(--(x) < _Py_RecursionLimitLowerWaterMark(_Py_CheckRecursionLimit))
static inline void _Py_LeaveRecursiveCall(PyThreadState *tstate) {
if (_Py_MakeEndRecCheck(tstate->recursion_depth)) {
tstate->overflowed = 0;
}
}
static inline void _Py_LeaveRecursiveCall_inline(void) {
PyThreadState *tstate = PyThreadState_GET();
_Py_LeaveRecursiveCall(tstate);
}
#define Py_LeaveRecursiveCall() _Py_LeaveRecursiveCall_inline()
#ifdef __cplusplus
}
#endif