add PyException_GetCause

Author: timfel

graalpython/com.oracle.graal.python.cext/src/capi.c

@@ -1641,6 +1641,10 @@ PyAPI_FUNC(void) PyEval_RestoreThread(PyThreadState* a) {
 PyAPI_FUNC(PyThreadState*) PyEval_SaveThread() {
     return GraalPyEval_SaveThread();
 }
+#undef PyException_GetCause
+PyAPI_FUNC(PyObject*) PyException_GetCause(PyObject* a) {
+    return GraalPyException_GetCause(a);
+}
 #undef PyException_GetContext
 PyAPI_FUNC(PyObject*) PyException_GetContext(PyObject* a) {
     return GraalPyException_GetContext(a);

graalpython/com.oracle.graal.python.cext/src/capi.h

@@ -148,6 +148,7 @@ typedef struct {
     BUILTIN(PyEval_GetBuiltins, PyObject*) \
     BUILTIN(PyEval_RestoreThread, void, PyThreadState*) \
     BUILTIN(PyEval_SaveThread, PyThreadState*) \
+    BUILTIN(PyException_GetCause, PyObject*, PyObject*) \
     BUILTIN(PyException_GetContext, PyObject*, PyObject*) \
     BUILTIN(PyException_SetCause, void, PyObject*, PyObject*) \
     BUILTIN(PyException_SetContext, void, PyObject*, PyObject*) \

graalpython/com.oracle.graal.python.jni/src/capi_forwards.h

@@ -2386,7 +2386,8 @@ PyAPI_FUNC(const char*) PyExceptionClass_Name(PyObject* a) {
     unimplemented("PyExceptionClass_Name"); exit(-1);
 }
 PyAPI_FUNC(PyObject*) PyException_GetCause(PyObject* a) {
-    unimplemented("PyException_GetCause"); exit(-1);
+    PyObject* result = (PyObject*) GraalPyException_GetCause(a);
+    return result;
 }
 PyAPI_FUNC(PyObject*) PyException_GetContext(PyObject* a) {
     PyObject* result = (PyObject*) GraalPyException_GetContext(a);