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1: #ifndef Py_CEVAL_H 2: #define Py_CEVAL_H 3: #ifdef __cplusplus 4: extern "C" { 5: #endif 6: 7: 8: /* Interface to random parts in ceval.c */ 9: 10: PyAPI_FUNC(PyObject *) PyEval_CallObjectWithKeywords( 11: PyObject *func, PyObject *args, PyObject *kwargs); 12: 13: /* Inline this */ 14: #define PyEval_CallObject(func,arg) \ 15: PyEval_CallObjectWithKeywords(func, arg, (PyObject *)NULL) 16: 17: PyAPI_FUNC(PyObject *) PyEval_CallFunction(PyObject *obj, 18: const char *format, ...); 19: PyAPI_FUNC(PyObject *) PyEval_CallMethod(PyObject *obj, 20: const char *methodname, 21: const char *format, ...); 22: 23: #ifndef Py_LIMITED_API 24: PyAPI_FUNC(void) PyEval_SetProfile(Py_tracefunc, PyObject *); 25: PyAPI_FUNC(void) PyEval_SetTrace(Py_tracefunc, PyObject *); 26: PyAPI_FUNC(void) _PyEval_SetCoroutineWrapper(PyObject *); 27: PyAPI_FUNC(PyObject *) _PyEval_GetCoroutineWrapper(void); 28: PyAPI_FUNC(void) _PyEval_SetAsyncGenFirstiter(PyObject *); 29: PyAPI_FUNC(PyObject *) _PyEval_GetAsyncGenFirstiter(void); 30: PyAPI_FUNC(void) _PyEval_SetAsyncGenFinalizer(PyObject *); 31: PyAPI_FUNC(PyObject *) _PyEval_GetAsyncGenFinalizer(void); 32: #endif 33: 34: struct _frame; /* Avoid including frameobject.h */ 35: 36: PyAPI_FUNC(PyObject *) PyEval_GetBuiltins(void); 37: PyAPI_FUNC(PyObject *) PyEval_GetGlobals(void); 38: PyAPI_FUNC(PyObject *) PyEval_GetLocals(void); 39: PyAPI_FUNC(struct _frame *) PyEval_GetFrame(void); 40: 41: /* Look at the current frame's (if any) code's co_flags, and turn on 42: the corresponding compiler flags in cf->cf_flags. Return 1 if any 43: flag was set, else return 0. */ 44: #ifndef Py_LIMITED_API 45: PyAPI_FUNC(int) PyEval_MergeCompilerFlags(PyCompilerFlags *cf); 46: #endif 47: 48: PyAPI_FUNC(int) Py_AddPendingCall(int (*func)(void *), void *arg); 49: PyAPI_FUNC(int) Py_MakePendingCalls(void); 50: 51: /* Protection against deeply nested recursive calls 52: 53: In Python 3.0, this protection has two levels: 54: * normal anti-recursion protection is triggered when the recursion level 55: exceeds the current recursion limit. It raises a RecursionError, and sets 56: the "overflowed" flag in the thread state structure. This flag 57: temporarily *disables* the normal protection; this allows cleanup code 58: to potentially outgrow the recursion limit while processing the 59: RecursionError. 60: * "last chance" anti-recursion protection is triggered when the recursion 61: level exceeds "current recursion limit + 50". By construction, this 62: protection can only be triggered when the "overflowed" flag is set. It 63: means the cleanup code has itself gone into an infinite loop, or the 64: RecursionError has been mistakingly ignored. When this protection is 65: triggered, the interpreter aborts with a Fatal Error. 66: 67: In addition, the "overflowed" flag is automatically reset when the 68: recursion level drops below "current recursion limit - 50". This heuristic 69: is meant to ensure that the normal anti-recursion protection doesn't get 70: disabled too long. 71: 72: Please note: this scheme has its own limitations. See: 73: http://mail.python.org/pipermail/python-dev/2008-August/082106.html 74: for some observations. 75: */ 76: PyAPI_FUNC(void) Py_SetRecursionLimit(int); 77: PyAPI_FUNC(int) Py_GetRecursionLimit(void); 78: 79: #define Py_EnterRecursiveCall(where) \ 80: (_Py_MakeRecCheck(PyThreadState_GET()->recursion_depth) && \ 81: _Py_CheckRecursiveCall(where)) 82: #define Py_LeaveRecursiveCall() \ 83: do{ if(_Py_MakeEndRecCheck(PyThreadState_GET()->recursion_depth)) \ 84: PyThreadState_GET()->overflowed = 0; \ 85: } while(0) 86: PyAPI_FUNC(int) _Py_CheckRecursiveCall(const char *where); 87: PyAPI_DATA(int) _Py_CheckRecursionLimit; 88: 89: #ifdef USE_STACKCHECK 90: /* With USE_STACKCHECK, we artificially decrement the recursion limit in order 91: to trigger regular stack checks in _Py_CheckRecursiveCall(), except if 92: the "overflowed" flag is set, in which case we need the true value 93: of _Py_CheckRecursionLimit for _Py_MakeEndRecCheck() to function properly. 94: */ 95: # define _Py_MakeRecCheck(x) \ 96: (++(x) > (_Py_CheckRecursionLimit += PyThreadState_GET()->overflowed - 1)) 97: #else 98: # define _Py_MakeRecCheck(x) (++(x) > _Py_CheckRecursionLimit) 99: #endif 100: 101: /* Compute the "lower-water mark" for a recursion limit. When 102: * Py_LeaveRecursiveCall() is called with a recursion depth below this mark, 103: * the overflowed flag is reset to 0. */ 104: #define _Py_RecursionLimitLowerWaterMark(limit) \ 105: (((limit) > 200) \ 106: ? ((limit) - 50) \ 107: : (3 * ((limit) >> 2))) 108: 109: #define _Py_MakeEndRecCheck(x) \ 110: (--(x) < _Py_RecursionLimitLowerWaterMark(_Py_CheckRecursionLimit)) 111: 112: #define Py_ALLOW_RECURSION \ 113: do { unsigned char _old = PyThreadState_GET()->recursion_critical;\ PyThreadState_GET()->recursion_critical = 1; 115: 116: #define Py_END_ALLOW_RECURSION \ 117: PyThreadState_GET()->recursion_critical = _old; \ 118: } while(0); 119: 120: PyAPI_FUNC(const char *) PyEval_GetFuncName(PyObject *); 121: PyAPI_FUNC(const char *) PyEval_GetFuncDesc(PyObject *); 122: 123: PyAPI_FUNC(PyObject *) PyEval_GetCallStats(PyObject *); 124: PyAPI_FUNC(PyObject *) PyEval_EvalFrame(struct _frame *); 125: PyAPI_FUNC(PyObject *) PyEval_EvalFrameEx(struct _frame *f, int exc); 126: #ifndef Py_LIMITED_API 127: PyAPI_FUNC(PyObject *) _PyEval_EvalFrameDefault(struct _frame *f, int exc); 128: #endif 129: 130: /* Interface for threads. 131: 132: A module that plans to do a blocking system call (or something else 133: that lasts a long time and doesn't touch Python data) can allow other 134: threads to run as follows: 135: 136: ...preparations here... 137: Py_BEGIN_ALLOW_THREADS 138: ...blocking system call here... 139: Py_END_ALLOW_THREADS 140: ...interpret result here... 141: 142: The Py_BEGIN_ALLOW_THREADS/Py_END_ALLOW_THREADS pair expands to a 143: {}-surrounded block. 144: To leave the block in the middle (e.g., with return), you must insert 145: a line containing Py_BLOCK_THREADS before the return, e.g. 146: 147: if (...premature_exit...) { 148: Py_BLOCK_THREADS 149: PyErr_SetFromErrno(PyExc_IOError); 150: return NULL; 151: } 152: 153: An alternative is: 154: 155: Py_BLOCK_THREADS 156: if (...premature_exit...) { 157: PyErr_SetFromErrno(PyExc_IOError); 158: return NULL; 159: } 160: Py_UNBLOCK_THREADS 161: 162: For convenience, that the value of 'errno' is restored across 163: Py_END_ALLOW_THREADS and Py_BLOCK_THREADS. 164: 165: WARNING: NEVER NEST CALLS TO Py_BEGIN_ALLOW_THREADS AND 166: Py_END_ALLOW_THREADS!!! 167: 168: The function PyEval_InitThreads() should be called only from 169: init_thread() in "_threadmodule.c". 170: 171: Note that not yet all candidates have been converted to use this 172: mechanism! 173: */ 174: 175: PyAPI_FUNC(PyThreadState *) PyEval_SaveThread(void); 176: PyAPI_FUNC(void) PyEval_RestoreThread(PyThreadState *); 177: 178: #ifdef WITH_THREAD 179: 180: PyAPI_FUNC(int) PyEval_ThreadsInitialized(void); 181: PyAPI_FUNC(void) PyEval_InitThreads(void); 182: #ifndef Py_LIMITED_API 183: PyAPI_FUNC(void) _PyEval_FiniThreads(void); 184: #endif /* !Py_LIMITED_API */ 185: PyAPI_FUNC(void) PyEval_AcquireLock(void); 186: PyAPI_FUNC(void) PyEval_ReleaseLock(void); 187: PyAPI_FUNC(void) PyEval_AcquireThread(PyThreadState *tstate); 188: PyAPI_FUNC(void) PyEval_ReleaseThread(PyThreadState *tstate); 189: PyAPI_FUNC(void) PyEval_ReInitThreads(void); 190: 191: #ifndef Py_LIMITED_API 192: PyAPI_FUNC(void) _PyEval_SetSwitchInterval(unsigned long microseconds); 193: PyAPI_FUNC(unsigned long) _PyEval_GetSwitchInterval(void); 194: #endif 195: 196: #ifndef Py_LIMITED_API 197: PyAPI_FUNC(Py_ssize_t) _PyEval_RequestCodeExtraIndex(freefunc); 198: #endif 199: 200: #define Py_BEGIN_ALLOW_THREADS { \ 201: PyThreadState *_save; \ 202: _save = PyEval_SaveThread(); 203: #define Py_BLOCK_THREADS PyEval_RestoreThread(_save); 204: #define Py_UNBLOCK_THREADS _save = PyEval_SaveThread(); 205: #define Py_END_ALLOW_THREADS PyEval_RestoreThread(_save); \ 206: } 207: 208: #else /* !WITH_THREAD */ 209: 210: #define Py_BEGIN_ALLOW_THREADS { 211: #define Py_BLOCK_THREADS 212: #define Py_UNBLOCK_THREADS 213: #define Py_END_ALLOW_THREADS } 214: 215: #endif /* !WITH_THREAD */ 216: 217: #ifndef Py_LIMITED_API 218: PyAPI_FUNC(int) _PyEval_SliceIndex(PyObject *, Py_ssize_t *); 219: PyAPI_FUNC(int) _PyEval_SliceIndexNotNone(PyObject *, Py_ssize_t *); 220: PyAPI_FUNC(void) _PyEval_SignalAsyncExc(void); 221: #endif 222: 223: /* Masks and values used by FORMAT_VALUE opcode. */ 224: #define FVC_MASK 0x3 225: #define FVC_NONE 0x0 226: #define FVC_STR 0x1 227: #define FVC_REPR 0x2 228: #define FVC_ASCII 0x3 229: #define FVS_MASK 0x4 230: #define FVS_HAVE_SPEC 0x4 231: 232: #ifdef __cplusplus 233: } 234: #endif 235: #endif /* !Py_CEVAL_H */ 236: