copy complex implementation from CPython

from_cpython/Include/complexobject.h

-// This file is originally from CPython 2.7, with modifications for Pyston
-
 /* Complex number structure */
 
 #ifndef Py_COMPLEXOBJECT_H
@@ -23,13 +21,13 @@ typedef struct {
 #define c_pow _Py_c_pow
 #define c_abs _Py_c_abs
 
-PyAPI_FUNC(Py_complex) c_sum(Py_complex, Py_complex) PYSTON_NOEXCEPT;
-PyAPI_FUNC(Py_complex) c_diff(Py_complex, Py_complex) PYSTON_NOEXCEPT;
-PyAPI_FUNC(Py_complex) c_neg(Py_complex) PYSTON_NOEXCEPT;
-PyAPI_FUNC(Py_complex) c_prod(Py_complex, Py_complex) PYSTON_NOEXCEPT;
-PyAPI_FUNC(Py_complex) c_quot(Py_complex, Py_complex) PYSTON_NOEXCEPT;
-PyAPI_FUNC(Py_complex) c_pow(Py_complex, Py_complex) PYSTON_NOEXCEPT;
-PyAPI_FUNC(double) c_abs(Py_complex) PYSTON_NOEXCEPT;
+PyAPI_FUNC(Py_complex) c_sum(Py_complex, Py_complex);
+PyAPI_FUNC(Py_complex) c_diff(Py_complex, Py_complex);
+PyAPI_FUNC(Py_complex) c_neg(Py_complex);
+PyAPI_FUNC(Py_complex) c_prod(Py_complex, Py_complex);
+PyAPI_FUNC(Py_complex) c_quot(Py_complex, Py_complex);
+PyAPI_FUNC(Py_complex) c_pow(Py_complex, Py_complex);
+PyAPI_FUNC(double) c_abs(Py_complex);
 
 
 /* Complex object interface */
@@ -39,35 +37,28 @@ PyComplexObject represents a complex number with double-precision
 real and imaginary parts.
 */
 
-// Pyston change: this is not our object format
-#if 0
 typedef struct {
     PyObject_HEAD
     Py_complex cval;
 } PyComplexObject;     
-#endif
-typedef struct _PyComplexObject PyComplexObject;
 
-// Pyston change: this is not a static object any more
-// PyAPI_DATA(PyTypeObject) PyComplex_Type;
-PyAPI_DATA(PyTypeObject*) complex_cls;
-#define PyComplex_Type (*complex_cls)
+PyAPI_DATA(PyTypeObject) PyComplex_Type;
 
 #define PyComplex_Check(op) PyObject_TypeCheck(op, &PyComplex_Type)
 #define PyComplex_CheckExact(op) (Py_TYPE(op) == &PyComplex_Type)
 
-PyAPI_FUNC(PyObject *) PyComplex_FromCComplex(Py_complex) PYSTON_NOEXCEPT;
-PyAPI_FUNC(PyObject *) PyComplex_FromDoubles(double real, double imag) PYSTON_NOEXCEPT;
+PyAPI_FUNC(PyObject *) PyComplex_FromCComplex(Py_complex);
+PyAPI_FUNC(PyObject *) PyComplex_FromDoubles(double real, double imag);
 
-PyAPI_FUNC(double) PyComplex_RealAsDouble(PyObject *op) PYSTON_NOEXCEPT;
-PyAPI_FUNC(double) PyComplex_ImagAsDouble(PyObject *op) PYSTON_NOEXCEPT;
-PyAPI_FUNC(Py_complex) PyComplex_AsCComplex(PyObject *op) PYSTON_NOEXCEPT;
+PyAPI_FUNC(double) PyComplex_RealAsDouble(PyObject *op);
+PyAPI_FUNC(double) PyComplex_ImagAsDouble(PyObject *op);
+PyAPI_FUNC(Py_complex) PyComplex_AsCComplex(PyObject *op);
 
 /* Format the object based on the format_spec, as defined in PEP 3101
    (Advanced String Formatting). */
 PyAPI_FUNC(PyObject *) _PyComplex_FormatAdvanced(PyObject *obj,
                                                  char *format_spec,
-                                                 Py_ssize_t format_spec_len) PYSTON_NOEXCEPT;
+                                                 Py_ssize_t format_spec_len);
 
 #ifdef __cplusplus
 }

from_cpython/Objects/complexobject.c

@@ -109,7 +109,7 @@ c_quot(Py_complex a, Py_complex b)
             r.imag = (a.imag - a.real * ratio) / denom;
         }
     }
-    else {
+    else if (abs_bimag >= abs_breal) {
         /* divide tops and bottom by b.imag */
         const double ratio = b.real / b.imag;
         const double denom = b.real * ratio + b.imag;
@@ -117,6 +117,10 @@ c_quot(Py_complex a, Py_complex b)
         r.real = (a.real * ratio + a.imag) / denom;
         r.imag = (a.imag * ratio - a.real) / denom;
     }
+    else {
+        /* At least one of b.real or b.imag is a NaN */
+        r.real = r.imag = Py_NAN;
+    }
     return r;
 }
 
@@ -215,8 +219,6 @@ c_abs(Py_complex z)
     return result;
 }
 
-// Pyston changes: comment this out
-#if 0
 static PyObject *
 complex_subtype_from_c_complex(PyTypeObject *type, Py_complex cval)
 {
@@ -479,12 +481,10 @@ complex_hash(PyComplexObject *v)
     return combined;
 }
 
-#endif
-
 /* This macro may return! */
 #define TO_COMPLEX(obj, c) \
     if (PyComplex_Check(obj)) \
-        c = PyComplex_AsCComplex(obj); \
+        c = ((PyComplexObject *)(obj))->cval; \
     else if (to_complex(&(obj), &(c)) < 0) \
         return (obj)
 
@@ -515,8 +515,7 @@ to_complex(PyObject **pobj, Py_complex *pc)
     return -1;
 }
 
-// Pyston change: comment this out
-#if 0
+
 static PyObject *
 complex_add(PyObject *v, PyObject *w)
 {
@@ -650,10 +649,8 @@ complex_divmod(PyObject *v, PyObject *w)
     Py_XDECREF(m);
     return z;
 }
-#endif
 
-// Pyston change: make no static
-PyObject *
+static PyObject *
 complex_pow(PyObject *v, PyObject *w, PyObject *z)
 {
     Py_complex p;
@@ -690,8 +687,6 @@ complex_pow(PyObject *v, PyObject *w, PyObject *z)
     return PyComplex_FromCComplex(p);
 }
 
-// Pyston changes: comment this out
-#if 0
 static PyObject *
 complex_int_div(PyObject *v, PyObject *w)
 {
@@ -1317,7 +1312,8 @@ static PyNumberMethods complex_as_number = {
 };
 
 PyTypeObject PyComplex_Type = {
-    PyVarObject_HEAD_INIT(&PyType_Type, 0)
+    // Pyston change, was &Py_Type_Type:
+    PyVarObject_HEAD_INIT(NULL, 0)
     "complex",
     sizeof(PyComplexObject),
     0,
@@ -1358,6 +1354,5 @@ PyTypeObject PyComplex_Type = {
     complex_new,                                /* tp_new */
     PyObject_Del,                               /* tp_free */
 };
-#endif
 
 #endif