SF patch #578297:

Change the parser and compiler to use PyMalloc.

Only the files implementing processes that will request memory
allocations small enough for PyMalloc to be a win have been
changed, which are:-
 - Python/compile.c
 - Parser/acceler.c
 - Parser/node.c
 - Parser/parsetok.c

This augments the aggressive overallocation strategy implemented by
Tim Peters in PyNode_AddChild() [Parser/node.c], in reducing the
impact of platform malloc()/realloc()/free() corner case behaviour.
Such corner cases are known to be triggered by test_longexp and
test_import.

Jeremy Hylton, in accepting this patch, recommended this as a
bugfix candidate for 2.2.  While the changes to Python/compile.c
and Parser/node.c backport easily (and could go in), the changes
to Parser/acceler.c and Parser/parsetok.c require other not
insignificant changes as a result of the differences in the memory
APIs between 2.3 and 2.2, which I'm not in a position to work
through at the moment.  This is a pity, as the Parser/parsetok.c
changes are the most important after the Parser/node.c changes, due
to the size of the memory requests involved and their frequency.

1 files changed, 6 insertions, 5 deletions

diff --git a/Parser/node.c b/Parser/node.c
index 780c23080b..75900ce842 100644
--- a/Parser/node.c
+++ b/Parser/node.c
@@ -7,7 +7,7 @@
 node *
 PyNode_New(int type)
 {
-	node *n = PyMem_NEW(node, 1);
+	node *n = (node *) PyObject_MALLOC(1 * sizeof(node));
 	if (n == NULL)
 		return NULL;
 	n->n_type = type;
@@ -92,7 +92,8 @@ PyNode_AddChild(register node *n1, int type, char *str, int lineno)
 		return E_OVERFLOW;
 	if (current_capacity < required_capacity) {
 		n = n1->n_child;
-		PyMem_RESIZE(n, node, required_capacity);
+		n = (node *) PyObject_REALLOC(n,
+					      required_capacity * sizeof(node));
 		if (n == NULL)
 			return E_NOMEM;
 		n1->n_child = n;
@@ -116,7 +117,7 @@ PyNode_Free(node *n)
 {
 	if (n != NULL) {
 		freechildren(n);
-		PyMem_DEL(n);
+		PyObject_FREE(n);
 	}
 }
 
@@ -127,7 +128,7 @@ freechildren(node *n)
 	for (i = NCH(n); --i >= 0; )
 		freechildren(CHILD(n, i));
 	if (n->n_child != NULL)
-		PyMem_DEL(n->n_child);
+		PyObject_FREE(n->n_child);
 	if (STR(n) != NULL)
-		PyMem_DEL(STR(n));
+		PyObject_FREE(STR(n));
 }