[Python-checkins] commit of r41486 - in python/trunk: Misc Python
neal.norwitz@python.org
neal.norwitz at python.org
Mon Nov 21 00:58:39 CET 2005
Author: neal.norwitz
Date: Mon Nov 21 00:58:38 2005
New Revision: 41486
Modified:
python/trunk/Misc/README.valgrind
python/trunk/Python/ast.c
python/trunk/Python/compile.c
python/trunk/Python/modsupport.c
Log:
Fix a few more memory leaks
Document more info about the benefits of configuring without
pymalloc when running valgrind
Modified: python/trunk/Misc/README.valgrind
==============================================================================
--- python/trunk/Misc/README.valgrind (original)
+++ python/trunk/Misc/README.valgrind Mon Nov 21 00:58:38 2005
@@ -12,6 +12,19 @@
* Uncomment the lines in Misc/valgrind-python.supp that
suppress the warnings for PyObject_Free and PyObject_Realloc
+If you want to use Valgrind more effectively and catch even more
+memory leaks, you will need to configure python --without-pymalloc.
+PyMalloc allocates a few blocks in big chunks and most object
+allocations don't call malloc, they use chunks doled about by PyMalloc
+from the big blocks. This means Valgrind can't detect
+many allocations (and frees), except for those that are forwarded
+to the system malloc. Note: configuring python --without-pymalloc
+makes Python run much slower, especially when running under Valgrind.
+You may need to run the tests in batches under Valgrind to keep
+the memory usage down to allow the tests to complete. It seems to take
+about 5 times longer to run --without-pymalloc.
+
+
Details:
--------
Python uses its own small-object allocation scheme on top of malloc,
@@ -21,7 +34,8 @@
Starting with Python 2.3, PyMalloc is used by default. You can disable
PyMalloc when configuring python by adding the --without-pymalloc option.
If you disable PyMalloc, most of the information in this document and
-the supplied suppressions file will not be useful.
+the supplied suppressions file will not be useful. As discussed above,
+disabling PyMalloc can catch more problems.
If you use valgrind on a default build of Python, you will see
many errors like:
Modified: python/trunk/Python/ast.c
==============================================================================
--- python/trunk/Python/ast.c (original)
+++ python/trunk/Python/ast.c Mon Nov 21 00:58:38 2005
@@ -1054,8 +1054,12 @@
return NULL;
}
- if (asdl_seq_LEN(t) == 1)
+ if (asdl_seq_LEN(t) == 1) {
lc = comprehension(asdl_seq_GET(t, 0), expression, NULL);
+ /* only free the sequence since we grabbed element 0 above */
+ if (lc)
+ asdl_seq_free(t); /* ok */
+ }
else
lc = comprehension(Tuple(t, Store, LINENO(ch)), expression, NULL);
@@ -1222,9 +1226,13 @@
return NULL;
}
- if (asdl_seq_LEN(t) == 1)
+ if (asdl_seq_LEN(t) == 1) {
ge = comprehension(asdl_seq_GET(t, 0), expression,
NULL);
+ /* only free the sequence since we grabbed element 0 above */
+ if (ge)
+ asdl_seq_free(t); /* ok */
+ }
else
ge = comprehension(Tuple(t, Store, LINENO(ch)),
expression, NULL);
Modified: python/trunk/Python/compile.c
==============================================================================
--- python/trunk/Python/compile.c (original)
+++ python/trunk/Python/compile.c Mon Nov 21 00:58:38 2005
@@ -2384,7 +2384,10 @@
dot = strchr(src, '.');
attr = PyString_FromStringAndSize(src,
dot ? dot - src : strlen(src));
+ if (!attr)
+ return -1;
ADDOP_O(c, LOAD_ATTR, attr, names);
+ Py_DECREF(attr);
src = dot + 1;
}
}
Modified: python/trunk/Python/modsupport.c
==============================================================================
--- python/trunk/Python/modsupport.c (original)
+++ python/trunk/Python/modsupport.c Mon Nov 21 00:58:38 2005
@@ -82,6 +82,7 @@
}
Py_DECREF(v);
}
+ Py_DECREF(n);
}
if (doc != NULL) {
v = PyString_FromString(doc);
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