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;\ 114 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(void) _PyEval_SignalAsyncExc(void); 220 #endif 221 222 /* Masks and values used by FORMAT_VALUE opcode. */ 223 #define FVC_MASK 0x3 224 #define FVC_NONE 0x0 225 #define FVC_STR 0x1 226 #define FVC_REPR 0x2 227 #define FVC_ASCII 0x3 228 #define FVS_MASK 0x4 229 #define FVS_HAVE_SPEC 0x4 230 231 #ifdef __cplusplus 232 } 233 #endif 234 #endif /* !Py_CEVAL_H */ 235
