mirror of https://github.com/python/cpython
81 lines
1.4 KiB
C
81 lines
1.4 KiB
C
|
|
#ifdef HAVE_LIMITS_H
|
|
#include <limits.h>
|
|
#endif
|
|
#ifndef INT_MAX
|
|
#define INT_MAX 2147483647
|
|
#endif
|
|
|
|
/* Parse tree node implementation */
|
|
|
|
#include "pgenheaders.h"
|
|
#include "node.h"
|
|
#include "errcode.h"
|
|
|
|
node *
|
|
PyNode_New(int type)
|
|
{
|
|
node *n = PyMem_NEW(node, 1);
|
|
if (n == NULL)
|
|
return NULL;
|
|
n->n_type = type;
|
|
n->n_str = NULL;
|
|
n->n_lineno = 0;
|
|
n->n_nchildren = 0;
|
|
n->n_child = NULL;
|
|
return n;
|
|
}
|
|
|
|
#define XXX 3 /* Node alignment factor to speed up realloc */
|
|
#define XXXROUNDUP(n) ((n) == 1 ? 1 : ((n) + XXX - 1) / XXX * XXX)
|
|
|
|
int
|
|
PyNode_AddChild(register node *n1, int type, char *str, int lineno)
|
|
{
|
|
register int nch = n1->n_nchildren;
|
|
register int nch1 = nch+1;
|
|
register node *n;
|
|
if (nch == INT_MAX || nch < 0)
|
|
return E_OVERFLOW;
|
|
if (XXXROUNDUP(nch) < nch1) {
|
|
n = n1->n_child;
|
|
nch1 = XXXROUNDUP(nch1);
|
|
PyMem_RESIZE(n, node, nch1);
|
|
if (n == NULL)
|
|
return E_NOMEM;
|
|
n1->n_child = n;
|
|
}
|
|
n = &n1->n_child[n1->n_nchildren++];
|
|
n->n_type = type;
|
|
n->n_str = str;
|
|
n->n_lineno = lineno;
|
|
n->n_nchildren = 0;
|
|
n->n_child = NULL;
|
|
return 0;
|
|
}
|
|
|
|
/* Forward */
|
|
static void freechildren(node *);
|
|
|
|
|
|
void
|
|
PyNode_Free(node *n)
|
|
{
|
|
if (n != NULL) {
|
|
freechildren(n);
|
|
PyMem_DEL(n);
|
|
}
|
|
}
|
|
|
|
static void
|
|
freechildren(node *n)
|
|
{
|
|
int i;
|
|
for (i = NCH(n); --i >= 0; )
|
|
freechildren(CHILD(n, i));
|
|
if (n->n_child != NULL)
|
|
PyMem_DEL(n->n_child);
|
|
if (STR(n) != NULL)
|
|
PyMem_DEL(STR(n));
|
|
}
|