| #ifndef Py_CEVAL_H |
| #define Py_CEVAL_H |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| |
| /* Interface to random parts in ceval.c */ |
| |
| PyAPI_FUNC(PyObject *) PyEval_CallObjectWithKeywords( |
| PyObject *, PyObject *, PyObject *); |
| |
| /* DLL-level Backwards compatibility: */ |
| #undef PyEval_CallObject |
| PyAPI_FUNC(PyObject *) PyEval_CallObject(PyObject *, PyObject *); |
| |
| /* Inline this */ |
| #define PyEval_CallObject(func,arg) \ |
| PyEval_CallObjectWithKeywords(func, arg, (PyObject *)NULL) |
| |
| PyAPI_FUNC(PyObject *) PyEval_CallFunction(PyObject *obj, |
| const char *format, ...); |
| PyAPI_FUNC(PyObject *) PyEval_CallMethod(PyObject *obj, |
| const char *methodname, |
| const char *format, ...); |
| |
| PyAPI_FUNC(void) PyEval_SetProfile(Py_tracefunc, PyObject *); |
| PyAPI_FUNC(void) PyEval_SetTrace(Py_tracefunc, PyObject *); |
| |
| struct _frame; /* Avoid including frameobject.h */ |
| |
| PyAPI_FUNC(PyObject *) PyEval_GetBuiltins(void); |
| PyAPI_FUNC(PyObject *) PyEval_GetGlobals(void); |
| PyAPI_FUNC(PyObject *) PyEval_GetLocals(void); |
| PyAPI_FUNC(struct _frame *) PyEval_GetFrame(void); |
| |
| /* Look at the current frame's (if any) code's co_flags, and turn on |
| the corresponding compiler flags in cf->cf_flags. Return 1 if any |
| flag was set, else return 0. */ |
| PyAPI_FUNC(int) PyEval_MergeCompilerFlags(PyCompilerFlags *cf); |
| |
| PyAPI_FUNC(int) Py_AddPendingCall(int (*func)(void *), void *arg); |
| PyAPI_FUNC(int) Py_MakePendingCalls(void); |
| |
| /* Protection against deeply nested recursive calls |
| |
| In Python 3.0, this protection has two levels: |
| * normal anti-recursion protection is triggered when the recursion level |
| exceeds the current recursion limit. It raises a RuntimeError, and sets |
| the "overflowed" flag in the thread state structure. This flag |
| temporarily *disables* the normal protection; this allows cleanup code |
| to potentially outgrow the recursion limit while processing the |
| RuntimeError. |
| * "last chance" anti-recursion protection is triggered when the recursion |
| level exceeds "current recursion limit + 50". By construction, this |
| protection can only be triggered when the "overflowed" flag is set. It |
| means the cleanup code has itself gone into an infinite loop, or the |
| RuntimeError has been mistakingly ignored. When this protection is |
| triggered, the interpreter aborts with a Fatal Error. |
| |
| In addition, the "overflowed" flag is automatically reset when the |
| recursion level drops below "current recursion limit - 50". This heuristic |
| is meant to ensure that the normal anti-recursion protection doesn't get |
| disabled too long. |
| |
| Please note: this scheme has its own limitations. See: |
| http://mail.python.org/pipermail/python-dev/2008-August/082106.html |
| for some observations. |
| */ |
| PyAPI_FUNC(void) Py_SetRecursionLimit(int); |
| PyAPI_FUNC(int) Py_GetRecursionLimit(void); |
| |
| #define Py_EnterRecursiveCall(where) \ |
| (_Py_MakeRecCheck(PyThreadState_GET()->recursion_depth) && \ |
| _Py_CheckRecursiveCall(where)) |
| #define Py_LeaveRecursiveCall() \ |
| do{ if(_Py_MakeEndRecCheck(PyThreadState_GET()->recursion_depth)) \ |
| PyThreadState_GET()->overflowed = 0; \ |
| } while(0) |
| PyAPI_FUNC(int) _Py_CheckRecursiveCall(char *where); |
| PyAPI_DATA(int) _Py_CheckRecursionLimit; |
| |
| #ifdef USE_STACKCHECK |
| /* With USE_STACKCHECK, we artificially decrement the recursion limit in order |
| to trigger regular stack checks in _Py_CheckRecursiveCall(), except if |
| the "overflowed" flag is set, in which case we need the true value |
| of _Py_CheckRecursionLimit for _Py_MakeEndRecCheck() to function properly. |
| */ |
| # define _Py_MakeRecCheck(x) \ |
| (++(x) > (_Py_CheckRecursionLimit += PyThreadState_GET()->overflowed - 1)) |
| #else |
| # define _Py_MakeRecCheck(x) (++(x) > _Py_CheckRecursionLimit) |
| #endif |
| |
| #ifdef USE_STACKCHECK |
| # define _Py_MakeEndRecCheck(x) (--(x) < _Py_CheckRecursionLimit - 50) |
| #else |
| # define _Py_MakeEndRecCheck(x) (--(x) < _Py_CheckRecursionLimit - 50) |
| #endif |
| |
| #define Py_ALLOW_RECURSION \ |
| do { unsigned char _old = PyThreadState_GET()->recursion_critical;\ |
| PyThreadState_GET()->recursion_critical = 1; |
| |
| #define Py_END_ALLOW_RECURSION \ |
| PyThreadState_GET()->recursion_critical = _old; \ |
| } while(0); |
| |
| PyAPI_FUNC(const char *) PyEval_GetFuncName(PyObject *); |
| PyAPI_FUNC(const char *) PyEval_GetFuncDesc(PyObject *); |
| |
| PyAPI_FUNC(PyObject *) PyEval_GetCallStats(PyObject *); |
| PyAPI_FUNC(PyObject *) PyEval_EvalFrame(struct _frame *); |
| PyAPI_FUNC(PyObject *) PyEval_EvalFrameEx(struct _frame *f, int exc); |
| |
| /* this used to be handled on a per-thread basis - now just two globals */ |
| PyAPI_DATA(volatile int) _Py_Ticker; |
| PyAPI_DATA(int) _Py_CheckInterval; |
| |
| /* Interface for threads. |
| |
| A module that plans to do a blocking system call (or something else |
| that lasts a long time and doesn't touch Python data) can allow other |
| threads to run as follows: |
| |
| ...preparations here... |
| Py_BEGIN_ALLOW_THREADS |
| ...blocking system call here... |
| Py_END_ALLOW_THREADS |
| ...interpret result here... |
| |
| The Py_BEGIN_ALLOW_THREADS/Py_END_ALLOW_THREADS pair expands to a |
| {}-surrounded block. |
| To leave the block in the middle (e.g., with return), you must insert |
| a line containing Py_BLOCK_THREADS before the return, e.g. |
| |
| if (...premature_exit...) { |
| Py_BLOCK_THREADS |
| PyErr_SetFromErrno(PyExc_IOError); |
| return NULL; |
| } |
| |
| An alternative is: |
| |
| Py_BLOCK_THREADS |
| if (...premature_exit...) { |
| PyErr_SetFromErrno(PyExc_IOError); |
| return NULL; |
| } |
| Py_UNBLOCK_THREADS |
| |
| For convenience, that the value of 'errno' is restored across |
| Py_END_ALLOW_THREADS and Py_BLOCK_THREADS. |
| |
| WARNING: NEVER NEST CALLS TO Py_BEGIN_ALLOW_THREADS AND |
| Py_END_ALLOW_THREADS!!! |
| |
| The function PyEval_InitThreads() should be called only from |
| init_thread() in "_threadmodule.c". |
| |
| Note that not yet all candidates have been converted to use this |
| mechanism! |
| */ |
| |
| PyAPI_FUNC(PyThreadState *) PyEval_SaveThread(void); |
| PyAPI_FUNC(void) PyEval_RestoreThread(PyThreadState *); |
| |
| #ifdef WITH_THREAD |
| |
| PyAPI_FUNC(int) PyEval_ThreadsInitialized(void); |
| PyAPI_FUNC(void) PyEval_InitThreads(void); |
| PyAPI_FUNC(void) PyEval_AcquireLock(void); |
| PyAPI_FUNC(void) PyEval_ReleaseLock(void); |
| PyAPI_FUNC(void) PyEval_AcquireThread(PyThreadState *tstate); |
| PyAPI_FUNC(void) PyEval_ReleaseThread(PyThreadState *tstate); |
| PyAPI_FUNC(void) PyEval_ReInitThreads(void); |
| |
| #define Py_BEGIN_ALLOW_THREADS { \ |
| PyThreadState *_save; \ |
| _save = PyEval_SaveThread(); |
| #define Py_BLOCK_THREADS PyEval_RestoreThread(_save); |
| #define Py_UNBLOCK_THREADS _save = PyEval_SaveThread(); |
| #define Py_END_ALLOW_THREADS PyEval_RestoreThread(_save); \ |
| } |
| |
| #else /* !WITH_THREAD */ |
| |
| #define Py_BEGIN_ALLOW_THREADS { |
| #define Py_BLOCK_THREADS |
| #define Py_UNBLOCK_THREADS |
| #define Py_END_ALLOW_THREADS } |
| |
| #endif /* !WITH_THREAD */ |
| |
| PyAPI_FUNC(int) _PyEval_SliceIndex(PyObject *, Py_ssize_t *); |
| |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| #endif /* !Py_CEVAL_H */ |