Merged revisions 59376-59406 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

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  r59377 | georg.brandl | 2007-12-06 01:24:23 +0100 (Thu, 06 Dec 2007) | 2 lines

  Add another GHOP student to ACKS.
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  r59378 | raymond.hettinger | 2007-12-06 01:56:53 +0100 (Thu, 06 Dec 2007) | 5 lines

  Fix Issue 1045.
  Factor-out common calling code by simplifying the length_hint API.
  Speed-up the function by caching the PyObject_String for the attribute lookup.
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  r59380 | georg.brandl | 2007-12-06 02:52:24 +0100 (Thu, 06 Dec 2007) | 2 lines

  Diverse markup fixes.
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  r59383 | georg.brandl | 2007-12-06 10:45:39 +0100 (Thu, 06 Dec 2007) | 2 lines

  Better re.split examples.
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  r59386 | christian.heimes | 2007-12-06 14:15:13 +0100 (Thu, 06 Dec 2007) | 2 lines

  Fixed get_config_h_filename for Windows. Without the patch it can't find the pyconfig.h file inside a build tree.
  Added several small unit tests for sysconfig.
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  r59387 | christian.heimes | 2007-12-06 14:30:11 +0100 (Thu, 06 Dec 2007) | 1 line

  Silence more warnings, _CRT_NONSTDC_NO_DEPRECATE is already defined in pyconfig.h but several projects don't include it.
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  r59389 | christian.heimes | 2007-12-06 14:55:01 +0100 (Thu, 06 Dec 2007) | 1 line

  Disabled one test that is failing on Unix
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  r59399 | christian.heimes | 2007-12-06 22:13:06 +0100 (Thu, 06 Dec 2007) | 8 lines

  Several Windows related cleanups:
  * Removed a #define from pyconfig.h. The macro was already defined a few lines higher.
  * Fixed path to tix in the build_tkinter.py script
  * Changed make_buildinfo.c to use versions of unlink and strcat which are considered safe by Windows (as suggested by MvL).
  * Removed two defines from pyproject.vsprops that are no longer required. Both are defined in pyconfig.h and make_buildinfo.c doesn't use the unsafe versions any more (as suggested by MvL).
  * Added some more information about PGO and the property files to PCbuild9/readme.txt.

  Are you fine with the changes, Martin?
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  r59400 | raymond.hettinger | 2007-12-07 02:53:01 +0100 (Fri, 07 Dec 2007) | 4 lines

  Don't have the docs berate themselves.  Keep a professional tone.
  If a todo is needed, put it in the tracker.
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  r59402 | georg.brandl | 2007-12-07 10:07:10 +0100 (Fri, 07 Dec 2007) | 3 lines

  Increase unit test coverage of SimpleXMLRPCServer.
  Written for GHOP by Turkay Eren.
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  r59406 | georg.brandl | 2007-12-07 16:16:57 +0100 (Fri, 07 Dec 2007) | 2 lines

  Update to windows doc from Robert.
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Objects/abstract.c

@@ -80,29 +80,47 @@ PyObject_Length(PyObject *o)
 }
 #define PyObject_Length PyObject_Size
 
-Py_ssize_t
-_PyObject_LengthHint(PyObject *o)
-{
-	Py_ssize_t rv = PyObject_Size(o);
-	if (rv != -1)
-		return rv;
-	if (PyErr_ExceptionMatches(PyExc_TypeError) ||
-	    PyErr_ExceptionMatches(PyExc_AttributeError)) {
-		PyObject *err_type, *err_value, *err_tb, *ro;
 
-		PyErr_Fetch(&err_type, &err_value, &err_tb);
-		ro = PyObject_CallMethod(o, "__length_hint__", NULL);
-		if (ro != NULL) {
-			rv = PyLong_AsLong(ro);
-			Py_DECREF(ro);
-			Py_XDECREF(err_type);
-			Py_XDECREF(err_value);
-			Py_XDECREF(err_tb);
-			return rv;
-		}
-		PyErr_Restore(err_type, err_value, err_tb);
+/* The length hint function returns a non-negative value from o.__len__()
+   or o.__length_hint__().  If those methods aren't found or return a negative
+   value, then the defaultvalue is returned.  This function never fails. 
+   Accordingly, it will mask exceptions raised in either method.
+*/
+
+Py_ssize_t
+_PyObject_LengthHint(PyObject *o, Py_ssize_t defaultvalue)
+{
+	static PyObject *hintstrobj = NULL;
+	PyObject *ro;
+	Py_ssize_t rv;
+
+	/* try o.__len__() */
+	rv = PyObject_Size(o);
+	if (rv >= 0)
+		return rv;
+	if (PyErr_Occurred())
+		PyErr_Clear();
+
+	/* cache a hashed version of the attribute string */
+	if (hintstrobj == NULL) {
+		hintstrobj = PyUnicode_InternFromString("__length_hint__");
+		if (hintstrobj == NULL)
+			goto defaultcase;
 	}
-	return -1;
+
+	/* try o.__length_hint__() */
+	ro = PyObject_CallMethodObjArgs(o, hintstrobj, NULL);
+	if (ro == NULL)
+		goto defaultcase;
+	rv = PyLong_AsSsize_t(ro);
+	Py_DECREF(ro);
+	if (rv >= 0)
+		return rv;
+
+defaultcase:
+	if (PyErr_Occurred())
+		PyErr_Clear();
+	return defaultvalue;
 }
 
 PyObject *
@@ -1655,17 +1673,7 @@ PySequence_Tuple(PyObject *v)
 		return NULL;
 
 	/* Guess result size and allocate space. */
-	n = _PyObject_LengthHint(v);
-	if (n < 0) {
-		if (PyErr_Occurred()
-		    && !PyErr_ExceptionMatches(PyExc_TypeError)
-		    && !PyErr_ExceptionMatches(PyExc_AttributeError)) {
-			Py_DECREF(it);
-			return NULL;
-		}
-		PyErr_Clear();
-		n = 10;	 /* arbitrary */
-	}
+	n = _PyObject_LengthHint(v, 10);
 	result = PyTuple_New(n);
 	if (result == NULL)
 		goto Fail;

Objects/bytesobject.c

@@ -2598,19 +2598,8 @@ bytes_extend(PyBytesObject *self, PyObject *arg)
     if (it == NULL)
         return NULL;
 
-    /* Try to determine the length of the argument. */
-    buf_size = _PyObject_LengthHint(arg);
-    /* The length of the argument is unknown or invalid. */
-    if (buf_size < 0) {
-        if (PyErr_Occurred()
-            && !PyErr_ExceptionMatches(PyExc_TypeError)
-            && !PyErr_ExceptionMatches(PyExc_AttributeError)) {
-            Py_DECREF(it);
-            return NULL;
-        }
-        PyErr_Clear();
-        buf_size = 32;          /* arbitrary */
-    }
+    /* Try to determine the length of the argument. 32 is abitrary. */
+    buf_size = _PyObject_LengthHint(arg, 32);
 
     buf = (char *)PyMem_Malloc(buf_size * sizeof(char));
     if (buf == NULL)

Objects/listobject.c

@@ -758,17 +758,7 @@ listextend(PyListObject *self, PyObject *b)
 	iternext = *it->ob_type->tp_iternext;
 
 	/* Guess a result list size. */
-	n = _PyObject_LengthHint(b);
-	if (n < 0) {
-		if (PyErr_Occurred()
-		    && !PyErr_ExceptionMatches(PyExc_TypeError)
-		    && !PyErr_ExceptionMatches(PyExc_AttributeError)) {
-			Py_DECREF(it);
-			return NULL;
-		}
-		PyErr_Clear();
-		n = 8;	/* arbitrary */
-	}
+	n = _PyObject_LengthHint(b, 8);
 	m = Py_Size(self);
 	mn = m + n;
 	if (mn >= m) {