empty bytes global

Cython/Compiler/ModuleNode.py

@@ -573,6 +573,7 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
         code.putln('static PyObject *%s;' % env.module_cname)
         code.putln('static PyObject *%s;' % Naming.builtins_cname)
         code.putln('static PyObject *%s;' % Naming.empty_tuple)
+        code.putln('static PyObject *%s;' % Naming.empty_bytes)
         if Options.pre_import is not None:
             code.putln('static PyObject *%s;' % Naming.preimport_cname)
         code.putln('static int %s;' % Naming.lineno_cname)
@@ -1647,6 +1648,11 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
         code.putln("#endif")
 
         code.putln("%s = PyTuple_New(0); %s" % (Naming.empty_tuple, code.error_goto_if_null(Naming.empty_tuple, self.pos)));
+        code.putln("#if PY_MAJOR_VERSION < 3");
+        code.putln("%s = PyString_FromStringAndSize(\"\", 0); %s" % (Naming.empty_bytes, code.error_goto_if_null(Naming.empty_bytes, self.pos)));
+        code.putln("#else");
+        code.putln("%s = PyBytes_FromStringAndSize(\"\", 0); %s" % (Naming.empty_bytes, code.error_goto_if_null(Naming.empty_bytes, self.pos)));
+        code.putln("#endif");
 
         code.putln("/*--- Library function declarations ---*/")
         env.generate_library_function_declarations(code)

Cython/Compiler/Naming.py

@@ -74,6 +74,7 @@ c_api_tab_cname  = pyrex_prefix + "c_api_tab"
 gilstate_cname   = pyrex_prefix + "state"
 skip_dispatch_cname = pyrex_prefix + "skip_dispatch"
 empty_tuple      = pyrex_prefix + "empty_tuple"
+empty_bytes      = pyrex_prefix + "empty_bytes"
 print_function   = pyrex_prefix + "print"
 print_function_kwargs   = pyrex_prefix + "print_kwargs"
 cleanup_cname    = pyrex_prefix + "module_cleanup"

Cython/Compiler/Nodes.py

@@ -5412,7 +5412,6 @@ static void __Pyx_AddTraceback(const char *funcname) {
     PyObject *py_srcfile = 0;
     PyObject *py_funcname = 0;
     PyObject *py_globals = 0;
-    PyObject *empty_string = 0;
     PyCodeObject *py_code = 0;
     PyFrameObject *py_frame = 0;
 
@@ -5439,12 +5438,6 @@ static void __Pyx_AddTraceback(const char *funcname) {
     if (!py_funcname) goto bad;
     py_globals = PyModule_GetDict(%(GLOBALS)s);
     if (!py_globals) goto bad;
-    #if PY_MAJOR_VERSION < 3
-    empty_string = PyString_FromStringAndSize("", 0);
-    #else
-    empty_string = PyBytes_FromStringAndSize("", 0);
-    #endif
-    if (!empty_string) goto bad;
     py_code = PyCode_New(
         0,            /*int argcount,*/
         #if PY_MAJOR_VERSION >= 3
@@ -5453,7 +5446,7 @@ static void __Pyx_AddTraceback(const char *funcname) {
         0,            /*int nlocals,*/
         0,            /*int stacksize,*/
         0,            /*int flags,*/
-        empty_string, /*PyObject *code,*/
+        %(EMPTY_BYTES)s, /*PyObject *code,*/
         %(EMPTY_TUPLE)s,  /*PyObject *consts,*/
         %(EMPTY_TUPLE)s,  /*PyObject *names,*/
         %(EMPTY_TUPLE)s,  /*PyObject *varnames,*/
@@ -5462,7 +5455,7 @@ static void __Pyx_AddTraceback(const char *funcname) {
         py_srcfile,   /*PyObject *filename,*/
         py_funcname,  /*PyObject *name,*/
         %(LINENO)s,   /*int firstlineno,*/
-        empty_string  /*PyObject *lnotab*/
+        %(EMPTY_BYTES)s  /*PyObject *lnotab*/
     );
     if (!py_code) goto bad;
     py_frame = PyFrame_New(
@@ -5477,7 +5470,6 @@ static void __Pyx_AddTraceback(const char *funcname) {
 bad:
     Py_XDECREF(py_srcfile);
     Py_XDECREF(py_funcname);
-    Py_XDECREF(empty_string);
     Py_XDECREF(py_code);
     Py_XDECREF(py_frame);
 }
@@ -5488,6 +5480,7 @@ bad:
     'CLINENO':  Naming.clineno_cname,
     'GLOBALS': Naming.module_cname,
     'EMPTY_TUPLE' : Naming.empty_tuple,
+    'EMPTY_BYTES' : Naming.empty_bytes,
 })
 
 restore_exception_utility_code = UtilityCode(