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77 lines
1.2 KiB
C
77 lines
1.2 KiB
C
/* Parse tree node implementation */
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#include "pgenheaders.h"
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#include "node.h"
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node *
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newtree(type)
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int type;
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{
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node *n = NEW(node, 1);
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if (n == NULL)
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return NULL;
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n->n_type = type;
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n->n_str = NULL;
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n->n_lineno = 0;
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n->n_nchildren = 0;
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n->n_child = NULL;
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return n;
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}
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#define XXX 3 /* Node alignment factor to speed up realloc */
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#define XXXROUNDUP(n) ((n) == 1 ? 1 : ((n) + XXX - 1) / XXX * XXX)
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node *
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addchild(n1, type, str, lineno)
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register node *n1;
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int type;
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char *str;
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int lineno;
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{
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register int nch = n1->n_nchildren;
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register int nch1 = nch+1;
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register node *n;
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if (XXXROUNDUP(nch) < nch1) {
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n = n1->n_child;
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nch1 = XXXROUNDUP(nch1);
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RESIZE(n, node, nch1);
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if (n == NULL)
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return NULL;
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n1->n_child = n;
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}
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n = &n1->n_child[n1->n_nchildren++];
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n->n_type = type;
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n->n_str = str;
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n->n_lineno = lineno;
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n->n_nchildren = 0;
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n->n_child = NULL;
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return n;
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}
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/* Forward */
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static void freechildren PROTO((node *));
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void
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freetree(n)
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node *n;
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{
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if (n != NULL) {
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freechildren(n);
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DEL(n);
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}
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}
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static void
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freechildren(n)
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node *n;
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{
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int i;
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for (i = NCH(n); --i >= 0; )
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freechildren(CHILD(n, i));
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if (n->n_child != NULL)
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DEL(n->n_child);
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if (STR(n) != NULL)
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DEL(STR(n));
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}
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