Add Pyston support

Pyston is another Python implementation. More like CPython + JIT. Patch
Cython to add Pyston support.

Cython/Utility/Coroutine.c

@@ -553,7 +553,7 @@ PyObject *__Pyx_Coroutine_SendEx(__pyx_CoroutineObject *self, PyObject *value) {
 
     __Pyx_PyThreadState_assign
     if (value) {
-#if CYTHON_COMPILING_IN_PYPY
+#if CYTHON_COMPILING_IN_PYPY || CYTHON_COMPILING_IN_PYSTON
         // FIXME: what to do in PyPy?
 #else
         // Generators always return to their most recent caller, not
@@ -580,7 +580,7 @@ PyObject *__Pyx_Coroutine_SendEx(__pyx_CoroutineObject *self, PyObject *value) {
     if (retval) {
         __Pyx_ExceptionSwap(&self->exc_type, &self->exc_value,
                             &self->exc_traceback);
-#if CYTHON_COMPILING_IN_PYPY
+#if CYTHON_COMPILING_IN_PYPY || CYTHON_COMPILING_IN_PYSTON
         // FIXME: what to do in PyPy?
 #else
         // Don't keep the reference to f_back any longer than necessary.  It
@@ -1486,7 +1486,7 @@ static void __Pyx__ReturnWithStopIteration(PyObject* value); /*proto*/
 
 static void __Pyx__ReturnWithStopIteration(PyObject* value) {
     PyObject *exc, *args;
-#if CYTHON_COMPILING_IN_CPYTHON
+#if CYTHON_COMPILING_IN_PYPY || CYTHON_COMPILING_IN_PYSTON
     __Pyx_PyThreadState_declare
     if ((PY_VERSION_HEX >= 0x03030000 && PY_VERSION_HEX < 0x030500B1) || unlikely(PyTuple_Check(value))) {
         args = PyTuple_New(1);

Cython/Utility/CythonFunction.c

@@ -1200,6 +1200,10 @@ static PyObject* __Pyx_Method_ClassMethod(PyObject *method) {
         // cdef classes
         return PyClassMethod_New(method);
     }
+#else
+#if CYTHON_COMPILING_IN_PYSTON
+    // Pyston add this API for convinience.
+    if (PyMethodDescr_Check(method)) {
 #else
     // It appears that PyMethodDescr_Type is not anywhere exposed in the Python/C API
     static PyTypeObject *methoddescr_type = NULL;
@@ -1210,6 +1214,7 @@ static PyObject* __Pyx_Method_ClassMethod(PyObject *method) {
        Py_DECREF(meth);
     }
     if (PyObject_TypeCheck(method, methoddescr_type)) {
+#endif
         // cdef classes
         PyMethodDescrObject *descr = (PyMethodDescrObject *)method;
         #if PY_VERSION_HEX < 0x03020000

Cython/Utility/ModuleSetupCode.c

@@ -53,6 +53,33 @@
   #define CYTHON_UNPACK_METHODS 0
   #undef CYTHON_FAST_THREAD_STATE
   #define CYTHON_FAST_THREAD_STATE 0
+#elif defined(PYSTON_VERSION)
+  #define CYTHON_COMPILING_IN_PYSTON 1
+  #define CYTHON_COMPILING_IN_PYPY 0
+  #define CYTHON_COMPILING_IN_CPYTHON 0
+  #ifndef CYTHON_USE_TYPE_SLOTS
+    #define CYTHON_USE_TYPE_SLOTS 1
+  #endif
+  #undef CYTHON_USE_ASYNC_SLOTS
+  #define CYTHON_USE_ASYNC_SLOTS 0
+  #undef CYTHON_USE_PYLIST_INTERNALS
+  #define CYTHON_USE_PYLIST_INTERNALS 0
+  #ifndef CYTHON_USE_UNICODE_INTERNALS
+    #define CYTHON_USE_UNICODE_INTERNALS 1
+  #endif
+  #undef CYTHON_USE_PYLONG_INTERNALS
+  #define CYTHON_USE_PYLONG_INTERNALS 0
+  #ifndef CYTHON_AVOID_BORROWED_REFS
+    #define CYTHON_AVOID_BORROWED_REFS 0
+  #endif
+  #ifndef CYTHON_ASSUME_SAFE_MACROS
+    #define CYTHON_ASSUME_SAFE_MACROS 1
+  #endif
+  #ifndef CYTHON_UNPACK_METHODS
+    #define CYTHON_UNPACK_METHODS 1
+  #endif
+  #undef CYTHON_FAST_THREAD_STATE
+  #define CYTHON_FAST_THREAD_STATE 0
 #else
   #define CYTHON_COMPILING_IN_PYPY 0
   #define CYTHON_COMPILING_IN_CPYTHON 1
@@ -186,8 +213,14 @@
   #define PyObject_Realloc(p)  PyMem_Realloc(p)
 #endif
 
-#define __Pyx_PyCode_HasFreeVars(co)  (PyCode_GetNumFree(co) > 0)
-#define __Pyx_PyFrame_SetLineNumber(frame, lineno)  (frame)->f_lineno = (lineno)
+/* Pyston provided out off box */
+#if !CYTHON_COMPILING_IN_PYSTON
+  #define __Pyx_PyCode_HasFreeVars(co)  (PyCode_GetNumFree(co) > 0)
+  #define __Pyx_PyFrame_SetLineNumber(frame, lineno)  (frame)->f_lineno = (lineno)
+#else
+  #define __Pyx_PyCode_HasFreeVars  PyCode_HasFreeVars
+  #define __Pyx_PyFrame_SetLineNumber PyFrame_SetLineNumber
+#endif
 
 #define __Pyx_PyString_FormatSafe(a, b)   ((unlikely((a) == Py_None)) ? PyNumber_Remainder(a, b) : __Pyx_PyString_Format(a, b))
 #define __Pyx_PyUnicode_FormatSafe(a, b)  ((unlikely((a) == Py_None)) ? PyNumber_Remainder(a, b) : PyUnicode_Format(a, b))

Cython/Utility/Profile.c

@@ -5,7 +5,7 @@
 // but maybe some other profilers don't.
 
 #ifndef CYTHON_PROFILE
-#if CYTHON_COMPILING_IN_PYPY
+#if CYTHON_COMPILING_IN_PYPY || CYTHON_COMPILING_IN_PYSTON
   #define CYTHON_PROFILE 0
 #else
   #define CYTHON_PROFILE 1