use faster __Pyx_PyObject_GetAttrStr() implementation and avoid static Python...

use faster __Pyx_PyObject_GetAttrStr() implementation and avoid static Python string reference in AddTraceback() helper

Cython/Compiler/Code.py

@@ -2214,7 +2214,7 @@ class CCodeWriter(object):
     def put_finish_refcount_context(self):
         self.putln("__Pyx_RefNannyFinishContext();")
 
-    def put_add_traceback(self, qualified_name):
+    def put_add_traceback(self, qualified_name, include_cline=True):
         """
         Build a Python traceback for propagating exceptions.
 
@@ -2222,7 +2222,7 @@ class CCodeWriter(object):
         """
         format_tuple = (
             qualified_name,
-            Naming.clineno_cname,
+            Naming.clineno_cname if include_cline else 0,
             Naming.lineno_cname,
             Naming.filename_cname,
         )

Cython/Compiler/ModuleNode.py

@@ -2251,9 +2251,10 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
         code.put_label(code.error_label)
         for cname, type in code.funcstate.all_managed_temps():
             code.put_xdecref(cname, type)
+        # module state might not be ready for traceback generation with C-line handling yet
         code.putln('if (%s) {' % env.module_cname)
         code.putln('if (%s) {' % env.module_dict_cname)
-        code.put_add_traceback("init %s" % env.qualified_name)
+        code.put_add_traceback("init %s" % env.qualified_name, include_cline=False)
         code.globalstate.use_utility_code(Nodes.traceback_utility_code)
         # Module reference and module dict are in global variables which might still be needed
         # for cleanup, atexit code, etc., so leaking is better than crashing.

Cython/Utility/Exceptions.c

@@ -536,6 +536,7 @@ static void __Pyx_AddTraceback(const char *funcname, int c_line,
 
 /////////////// AddTraceback ///////////////
 //@requires: ModuleSetupCode.c::CodeObjectCache
+//@requires: ObjectHandling.c::PyObjectGetAttrStr
 //@substitute: naming
 
 #include "compile.h"
@@ -603,21 +604,12 @@ static void __Pyx_AddTraceback(const char *funcname, int c_line,
     PyObject *use_cline = 0;
     PyObject *ptype, *pvalue, *ptraceback;
 
-    static PyObject* cline_in_traceback = NULL;
-    if (cline_in_traceback == NULL) {
-      #if PY_MAJOR_VERSION < 3
-      cline_in_traceback = PyString_FromString("cline_in_traceback");
-      #else
-      cline_in_traceback = PyUnicode_FromString("cline_in_traceback");
-      #endif
-    }
-
     if (c_line) {
       PyErr_Fetch(&ptype, &pvalue, &ptraceback);
-      use_cline = PyObject_GetAttr(${cython_runtime_cname}, cline_in_traceback);
+      use_cline = __Pyx_PyObject_GetAttrStr(${cython_runtime_cname}, PYIDENT("cline_in_traceback"));
       if (use_cline == NULL) {
         c_line = 0;
-        PyObject_SetAttr(${cython_runtime_cname}, cline_in_traceback, Py_False);
+        PyObject_SetAttr(${cython_runtime_cname}, PYIDENT("cline_in_traceback"), Py_False);
       }
       else if (PyObject_Not(use_cline) != 0) {
         c_line = 0;