159 lines
2.3 KiB
C
159 lines
2.3 KiB
C
/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*
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* Author: Ceriel J.H. Jacobs
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*/
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/* 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 */
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/* $Header$ */
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#include "debug.h"
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#include <em_label.h>
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#include <em_arith.h>
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#include <alloc.h>
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#include <system.h>
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#include "LLlex.h"
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#include "def.h"
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#include "type.h"
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#include "node.h"
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#include "main.h"
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static int nsubnodes[] = {
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0,
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2,
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2,
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2,
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2,
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2,
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1,
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1,
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2,
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1,
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2,
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1,
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2
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};
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t_node *
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getnode(class)
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{
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register t_node *nd = new_node();
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if (options['R']) nd->nd_flags |= ROPTION;
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if (options['A']) nd->nd_flags |= AOPTION;
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nd->nd_class = class;
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return nd;
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}
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t_node *
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dot2node(class, left, right)
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t_node *left, *right;
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{
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register t_node *nd = getnode(class);
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nd->nd_symb = dot.tk_symb;
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nd->nd_lineno = dot.tk_lineno;
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nd->nd_LEFT = left;
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nd->nd_RIGHT = right;
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return nd;
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}
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t_node *
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dot2leaf(class)
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{
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register t_node *nd = getnode(class);
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nd->nd_token = dot;
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switch(nsubnodes[class]) {
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case 1:
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nd->nd_NEXT = 0;
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break;
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case 2:
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nd->nd_LEFT = 0;
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nd->nd_RIGHT = 0;
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break;
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}
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return nd;
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}
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FreeNode(nd)
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register t_node *nd;
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{
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/* Put nodes that are no longer needed back onto the free
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list
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*/
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if (!nd) return;
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switch(nsubnodes[nd->nd_class]) {
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case 2:
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FreeNode(nd->nd_LEFT);
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FreeNode(nd->nd_RIGHT);
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break;
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case 1:
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FreeNode(nd->nd_NEXT);
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break;
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}
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free_node(nd);
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}
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/*ARGSUSED*/
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NodeCrash(expp)
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t_node *expp;
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{
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crash("(NodeCrash) Illegal node");
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}
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/*ARGSUSED*/
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PNodeCrash(expp)
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t_node **expp;
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{
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crash("(PNodeCrash) Illegal node");
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}
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#ifdef DEBUG
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extern char *symbol2str();
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indnt(lvl)
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{
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while (lvl--) {
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print(" ");
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}
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}
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printnode(nd, lvl)
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register t_node *nd;
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{
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indnt(lvl);
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print("Class: %d; Symbol: %s; Flags: %d\n", nd->nd_class, symbol2str(nd->nd_symb), nd->nd_flags);
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if (nd->nd_type) {
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indnt(lvl);
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print("Type: ");
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DumpType(nd->nd_type);
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print("\n");
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}
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}
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PrNode(nd, lvl)
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register t_node *nd;
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{
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if (! nd) {
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indnt(lvl); print("<nilnode>\n");
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return;
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}
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printnode(nd, lvl);
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switch(nsubnodes[nd->nd_class]) {
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case 1:
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PrNode(nd->nd_LEFT, lvl + 1);
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PrNode(nd->nd_RIGHT, lvl + 1);
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break;
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case 2:
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PrNode(nd->nd_NEXT, lvl + 1);
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break;
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}
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}
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#endif /* DEBUG */
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