93 lines
1.5 KiB
C
93 lines
1.5 KiB
C
/* 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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#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 "def.h"
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#include "type.h"
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#include "LLlex.h"
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#include "node.h"
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struct node *
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MkNode(class, left, right, token)
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struct node *left, *right;
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struct token *token;
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{
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/* Create a node and initialize it with the given parameters
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*/
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register struct node *nd = new_node();
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nd->nd_left = left;
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nd->nd_right = right;
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nd->nd_token = *token;
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nd->nd_class = class;
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nd->nd_type = error_type;
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return nd;
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}
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struct node *
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MkLeaf(class, token)
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struct token *token;
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{
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register struct node *nd = new_node();
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nd->nd_left = nd->nd_right = 0;
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nd->nd_token = *token;
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nd->nd_type = error_type;
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nd->nd_class = class;
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return nd;
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}
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FreeNode(nd)
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register struct 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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FreeNode(nd->nd_left);
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FreeNode(nd->nd_right);
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free_node(nd);
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}
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NodeCrash(expp)
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struct node *expp;
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{
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crash("Illegal node %d", expp->nd_class);
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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 struct node *nd;
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{
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indnt(lvl);
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print("C: %d; T: %s\n", nd->nd_class, symbol2str(nd->nd_symb));
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}
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PrNode(nd, lvl)
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register struct 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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PrNode(nd->nd_left, lvl + 1);
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printnode(nd, lvl);
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PrNode(nd->nd_right, lvl + 1);
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}
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#endif DEBUG
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