159 lines
2.3 KiB
C
159 lines
2.3 KiB
C
/*
|
|
* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
|
|
* See the copyright notice in the ACK home directory, in the file "Copyright".
|
|
*
|
|
* Author: Ceriel J.H. Jacobs
|
|
*/
|
|
|
|
/* N O D E O F A N A B S T R A C T P A R S E T R E E */
|
|
|
|
/* $Id$ */
|
|
|
|
#include "debug.h"
|
|
|
|
#include <em_label.h>
|
|
#include <em_arith.h>
|
|
#include <alloc.h>
|
|
#include <system.h>
|
|
|
|
#include "LLlex.h"
|
|
#include "def.h"
|
|
#include "type.h"
|
|
#include "node.h"
|
|
#include "main.h"
|
|
|
|
static int nsubnodes[] = {
|
|
0,
|
|
2,
|
|
2,
|
|
2,
|
|
2,
|
|
2,
|
|
1,
|
|
1,
|
|
2,
|
|
1,
|
|
2,
|
|
1,
|
|
2
|
|
};
|
|
|
|
t_node *
|
|
getnode(class)
|
|
{
|
|
register t_node *nd = new_node();
|
|
|
|
if (options['R']) nd->nd_flags |= ROPTION;
|
|
if (options['A']) nd->nd_flags |= AOPTION;
|
|
nd->nd_class = class;
|
|
return nd;
|
|
}
|
|
|
|
t_node *
|
|
dot2node(class, left, right)
|
|
t_node *left, *right;
|
|
{
|
|
register t_node *nd = getnode(class);
|
|
|
|
nd->nd_symb = dot.tk_symb;
|
|
nd->nd_lineno = dot.tk_lineno;
|
|
nd->nd_LEFT = left;
|
|
nd->nd_RIGHT = right;
|
|
return nd;
|
|
}
|
|
|
|
t_node *
|
|
dot2leaf(class)
|
|
{
|
|
register t_node *nd = getnode(class);
|
|
|
|
nd->nd_token = dot;
|
|
switch(nsubnodes[class]) {
|
|
case 1:
|
|
nd->nd_NEXT = 0;
|
|
break;
|
|
case 2:
|
|
nd->nd_LEFT = 0;
|
|
nd->nd_RIGHT = 0;
|
|
break;
|
|
}
|
|
return nd;
|
|
}
|
|
|
|
FreeNode(nd)
|
|
register t_node *nd;
|
|
{
|
|
/* Put nodes that are no longer needed back onto the free
|
|
list
|
|
*/
|
|
if (!nd) return;
|
|
switch(nsubnodes[nd->nd_class]) {
|
|
case 2:
|
|
FreeNode(nd->nd_LEFT);
|
|
FreeNode(nd->nd_RIGHT);
|
|
break;
|
|
case 1:
|
|
FreeNode(nd->nd_NEXT);
|
|
break;
|
|
}
|
|
free_node(nd);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
NodeCrash(expp)
|
|
t_node *expp;
|
|
{
|
|
crash("(NodeCrash) Illegal node");
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
PNodeCrash(expp)
|
|
t_node **expp;
|
|
{
|
|
crash("(PNodeCrash) Illegal node");
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
|
|
extern char *symbol2str();
|
|
|
|
indnt(lvl)
|
|
{
|
|
while (lvl--) {
|
|
print(" ");
|
|
}
|
|
}
|
|
|
|
printnode(nd, lvl)
|
|
register t_node *nd;
|
|
{
|
|
indnt(lvl);
|
|
print("Class: %d; Symbol: %s; Flags: %d\n", nd->nd_class, symbol2str(nd->nd_symb), nd->nd_flags);
|
|
if (nd->nd_type) {
|
|
indnt(lvl);
|
|
print("Type: ");
|
|
DumpType(nd->nd_type);
|
|
print("\n");
|
|
}
|
|
}
|
|
|
|
PrNode(nd, lvl)
|
|
register t_node *nd;
|
|
{
|
|
if (! nd) {
|
|
indnt(lvl); print("<nilnode>\n");
|
|
return;
|
|
}
|
|
printnode(nd, lvl);
|
|
switch(nsubnodes[nd->nd_class]) {
|
|
case 1:
|
|
PrNode(nd->nd_LEFT, lvl + 1);
|
|
PrNode(nd->nd_RIGHT, lvl + 1);
|
|
break;
|
|
case 2:
|
|
PrNode(nd->nd_NEXT, lvl + 1);
|
|
break;
|
|
}
|
|
}
|
|
#endif /* DEBUG */
|