1 /* $NetBSD: graph.c,v 1.9 2021/02/20 22:57:56 christos Exp $ */
2
3 #include "defs.h"
4 /* Id: graph.c,v 1.9 2020/09/10 17:22:51 tom Exp */
5
6 #include <sys/cdefs.h>
7 __RCSID("$NetBSD: graph.c,v 1.9 2021/02/20 22:57:56 christos Exp $");
8
9 static void graph_state(int stateno);
10 static void graph_LA(int ruleno);
11
12 static unsigned int larno;
13
14 void
graph(void)15 graph(void)
16 {
17 int i;
18 int j;
19 shifts *sp;
20 int sn;
21 int as;
22
23 if (!gflag)
24 return;
25
26 for (i = 0; i < nstates; ++i)
27 {
28 closure(state_table[i]->items, state_table[i]->nitems);
29 graph_state(i);
30 }
31
32 fprintf(graph_file, "\n\n");
33 for (i = 0; i < nstates; ++i)
34 {
35
36 sp = shift_table[i];
37 if (sp)
38 for (j = 0; j < sp->nshifts; ++j)
39 {
40 sn = sp->shift[j];
41 as = accessing_symbol[sn];
42 fprintf(graph_file,
43 "\tq%d -> q%d [label=\"%s\"];\n",
44 i, sn, symbol_pname[as]);
45 }
46 }
47
48 fprintf(graph_file, "}\n");
49
50 for (i = 0; i < nsyms; ++i)
51 FREE(symbol_pname[i]);
52 FREE(symbol_pname);
53 }
54
55 static void
graph_state(int stateno)56 graph_state(int stateno)
57 {
58 Value_t *isp;
59 Value_t *sp;
60
61 larno = (unsigned)lookaheads[stateno];
62 fprintf(graph_file, "\n\tq%d [label=\"%d:\\l", stateno, stateno);
63
64 for (isp = itemset; isp < itemsetend; isp++)
65 {
66 Value_t *sp1;
67 int rule;
68
69 sp1 = sp = ritem + *isp;
70
71 while (*sp >= 0)
72 ++sp;
73 rule = -(*sp);
74 fprintf(graph_file, " %s -> ", symbol_pname[rlhs[rule]]);
75
76 for (sp = ritem + rrhs[rule]; sp < sp1; sp++)
77 fprintf(graph_file, "%s ", symbol_pname[*sp]);
78
79 putc('.', graph_file);
80
81 while (*sp >= 0)
82 {
83 fprintf(graph_file, " %s", symbol_pname[*sp]);
84 sp++;
85 }
86
87 if (*sp1 < 0)
88 graph_LA(-*sp1);
89
90 fprintf(graph_file, "\\l");
91 }
92 fprintf(graph_file, "\"];");
93 }
94
95 static void
graph_LA(int ruleno)96 graph_LA(int ruleno)
97 {
98 unsigned tokensetsize;
99
100 tokensetsize = (unsigned)WORDSIZE(ntokens);
101
102 if (ruleno == LAruleno[larno])
103 {
104 int i;
105 unsigned *rowp = LA + larno * tokensetsize;
106
107 fprintf(graph_file, " { ");
108 for (i = ntokens - 1; i >= 0; i--)
109 {
110 if (BIT(rowp, i))
111 fprintf(graph_file, "%s ", symbol_pname[i]);
112 }
113 fprintf(graph_file, "}");
114 ++larno;
115 }
116 }
117