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SF patch #578297:

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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.
This commit is contained in:
Andrew MacIntyre 2002-08-04 06:28:21 +00:00
parent 4104db39b8
commit 80d4e2acf5
4 changed files with 20 additions and 19 deletions
Download patch file Download diff file Expand all files Collapse all files

8
Parser/acceler.c
View file

@ -44,7 +44,7 @@ PyGrammar_RemoveAccelerators(grammar *g)
s = d->d_state;
for (j = 0; j < d->d_nstates; j++, s++) {
if (s->s_accel)
PyMem_DEL(s->s_accel);
PyObject_FREE(s->s_accel);
s->s_accel = NULL;
}
}
@ -68,7 +68,7 @@ fixstate(grammar *g, state *s)
int *accel;
int nl = g->g_ll.ll_nlabels;
s->s_accept = 0;
accel = PyMem_NEW(int, nl);
accel = (int *) PyObject_MALLOC(nl * sizeof(int));
for (k = 0; k < nl; k++)
accel[k] = -1;
a = s->s_arc;
@ -124,7 +124,7 @@ fixstate(grammar *g, state *s)
k++;
if (k < nl) {
int i;
s->s_accel = PyMem_NEW(int, nl-k);
s->s_accel = (int *) PyObject_MALLOC((nl-k) * sizeof(int));
if (s->s_accel == NULL) {
fprintf(stderr, "no mem to add parser accelerators\n");
exit(1);
@ -134,5 +134,5 @@ fixstate(grammar *g, state *s)
for (i = 0; k < nl; i++, k++)
s->s_accel[i] = accel[k];
}
PyMem_DEL(accel);
PyObject_FREE(accel);
}

11
Parser/node.c
View file

@ -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));
}

6
Parser/parsetok.c
View file

@ -133,7 +133,7 @@ parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
else
started = 1;
len = b - a; /* XXX this may compute NULL - NULL */
str = PyMem_NEW(char, len + 1);
str = (char *) PyObject_MALLOC(len + 1);
if (str == NULL) {
fprintf(stderr, "no mem for next token\n");
err_ret->error = E_NOMEM;
@ -157,7 +157,7 @@ parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
PyParser_AddToken(ps, (int)type, str, tok->lineno,
&(err_ret->expected))) != E_OK) {
if (err_ret->error != E_DONE)
PyMem_DEL(str);
PyObject_FREE(str);
break;
}
}
@ -178,7 +178,7 @@ parsetok(struct tok_state *tok, grammar *g, int start, perrdetail *err_ret,
err_ret->offset = tok->cur - tok->buf;
if (tok->buf != NULL) {
size_t len = tok->inp - tok->buf;
err_ret->text = PyMem_NEW(char, len + 1);
err_ret->text = (char *) PyObject_MALLOC(len + 1);
if (err_ret->text != NULL) {
if (len > 0)
strncpy(err_ret->text, tok->buf, len);