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output.c
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/* $NetBSD: output.c,v 1.6 1997/07/25 16:46:35 perry Exp $ */
/*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Robert Paul Corbett.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)output.c 5.7 (Berkeley) 5/24/93";
#else
__RCSID("$NetBSD: output.c,v 1.6 1997/07/25 16:46:35 perry Exp $");
#endif
#endif /* not lint */
#include "defs.h"
static int nvectors;
static int nentries;
static short **froms;
static short **tos;
static short *tally;
static short *width;
static short *state_count;
static short *order;
static short *base;
static short *pos;
static int maxtable;
static short *table;
static short *check;
static int lowzero;
static int high;
void output __P((void));
void output_prefix __P((void));
void output_rule_data __P((void));
void output_yydefred __P((void));
void output_actions __P((void));
void token_actions __P((void));
void goto_actions __P((void));
int default_goto __P((int));
void save_column __P((int, int));
void sort_actions __P((void));
void pack_table __P((void));
int matching_vector __P((int));
int pack_vector __P((int));
void output_base __P((void));
void output_table __P((void));
void output_check __P((void));
int is_C_identifier __P((char *));
void output_defines __P((void));
void output_stored_text __P((void));
void output_debug __P((void));
void output_stype __P((void));
void output_trailing_text __P((void));
void output_semantic_actions __P((void));
void free_itemsets __P((void));
void free_shifts __P((void));
void free_reductions __P((void));
void
output()
{
free_itemsets();
free_shifts();
free_reductions();
output_prefix();
output_stored_text();
output_defines();
output_rule_data();
output_yydefred();
output_actions();
free_parser();
output_debug();
output_stype();
if (rflag) write_section(tables);
write_section(header);
output_trailing_text();
write_section(body);
output_semantic_actions();
write_section(trailer);
}
void
output_prefix()
{
if (symbol_prefix == NULL)
symbol_prefix = "yy";
else
{
++outline;
fprintf(code_file, "#define yyparse %sparse\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yylex %slex\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yyerror %serror\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yychar %schar\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yyval %sval\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yylval %slval\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yydebug %sdebug\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yynerrs %snerrs\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yyerrflag %serrflag\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yyss %sss\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yysslim %ssslim\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yyssp %sssp\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yyvs %svs\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yyvsp %svsp\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yystacksize %sstacksize\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yylhs %slhs\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yylen %slen\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yydefred %sdefred\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yydgoto %sdgoto\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yysindex %ssindex\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yyrindex %srindex\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yygindex %sgindex\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yytable %stable\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yycheck %scheck\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yyname %sname\n", symbol_prefix);
++outline;
fprintf(code_file, "#define yyrule %srule\n", symbol_prefix);
}
++outline;
fprintf(code_file, "#define YYPREFIX \"%s\"\n", symbol_prefix);
}
void
output_rule_data()
{
int i;
int j;
fprintf(output_file, "short %slhs[] = {%42d,", symbol_prefix,
symbol_value[start_symbol]);
j = 10;
for (i = 3; i < nrules; i++)
{
if (j >= 10)
{
if (!rflag) ++outline;
putc('\n', output_file);
j = 1;
}
else
++j;
fprintf(output_file, "%5d,", symbol_value[rlhs[i]]);
}
if (!rflag) outline += 2;
fprintf(output_file, "\n};\n");
fprintf(output_file, "short %slen[] = {%42d,", symbol_prefix, 2);
j = 10;
for (i = 3; i < nrules; i++)
{
if (j >= 10)
{
if (!rflag) ++outline;
putc('\n', output_file);
j = 1;
}
else
j++;
fprintf(output_file, "%5d,", rrhs[i + 1] - rrhs[i] - 1);
}
if (!rflag) outline += 2;
fprintf(output_file, "\n};\n");
}
void
output_yydefred()
{
int i, j;
fprintf(output_file, "short %sdefred[] = {%39d,", symbol_prefix,
(defred[0] ? defred[0] - 2 : 0));
j = 10;
for (i = 1; i < nstates; i++)
{
if (j < 10)
++j;
else
{
if (!rflag) ++outline;
putc('\n', output_file);
j = 1;
}
fprintf(output_file, "%5d,", (defred[i] ? defred[i] - 2 : 0));
}
if (!rflag) outline += 2;
fprintf(output_file, "\n};\n");
}
void
output_actions()
{
nvectors = 2*nstates + nvars;
froms = NEW2(nvectors, short *);
tos = NEW2(nvectors, short *);
tally = NEW2(nvectors, short);
width = NEW2(nvectors, short);
token_actions();
FREE(lookaheads);
FREE(LA);
FREE(LAruleno);
FREE(accessing_symbol);
goto_actions();
FREE(goto_map + ntokens);
FREE(from_state);
FREE(to_state);
sort_actions();
pack_table();
output_base();
output_table();
output_check();
}
void
token_actions()
{
int i, j;
int shiftcount, reducecount;
int max, min;
short *actionrow, *r, *s;
action *p;
actionrow = NEW2(2*ntokens, short);
for (i = 0; i < nstates; ++i)
{
if (parser[i])
{
for (j = 0; j < 2*ntokens; ++j)
actionrow[j] = 0;
shiftcount = 0;
reducecount = 0;
for (p = parser[i]; p; p = p->next)
{
if (p->suppressed == 0)
{
if (p->action_code == SHIFT)
{
++shiftcount;
actionrow[p->symbol] = p->number;
}
else if (p->action_code == REDUCE && p->number != defred[i])
{
++reducecount;
actionrow[p->symbol + ntokens] = p->number;
}
}
}
tally[i] = shiftcount;
tally[nstates+i] = reducecount;
width[i] = 0;
width[nstates+i] = 0;
if (shiftcount > 0)
{
froms[i] = r = NEW2(shiftcount, short);
tos[i] = s = NEW2(shiftcount, short);
min = MAXSHORT;
max = 0;
for (j = 0; j < ntokens; ++j)
{
if (actionrow[j])
{
if (min > symbol_value[j])
min = symbol_value[j];
if (max < symbol_value[j])
max = symbol_value[j];
*r++ = symbol_value[j];
*s++ = actionrow[j];
}
}
width[i] = max - min + 1;
}
if (reducecount > 0)
{
froms[nstates+i] = r = NEW2(reducecount, short);
tos[nstates+i] = s = NEW2(reducecount, short);
min = MAXSHORT;
max = 0;
for (j = 0; j < ntokens; ++j)
{
if (actionrow[ntokens+j])
{
if (min > symbol_value[j])
min = symbol_value[j];
if (max < symbol_value[j])
max = symbol_value[j];
*r++ = symbol_value[j];
*s++ = actionrow[ntokens+j] - 2;
}
}
width[nstates+i] = max - min + 1;
}
}
}
FREE(actionrow);
}
void
goto_actions()
{
int i, j, k;
state_count = NEW2(nstates, short);
k = default_goto(start_symbol + 1);
fprintf(output_file, "short %sdgoto[] = {%40d,", symbol_prefix, k);
save_column(start_symbol + 1, k);
j = 10;
for (i = start_symbol + 2; i < nsyms; i++)
{
if (j >= 10)
{
if (!rflag) ++outline;
putc('\n', output_file);
j = 1;
}
else
++j;
k = default_goto(i);
fprintf(output_file, "%5d,", k);
save_column(i, k);
}
if (!rflag) outline += 2;
fprintf(output_file, "\n};\n");
FREE(state_count);
}
int
default_goto(symbol)
int symbol;
{
int i;
int m;
int n;
int default_state;
int max;
m = goto_map[symbol];
n = goto_map[symbol + 1];
if (m == n) return (0);
for (i = 0; i < nstates; i++)
state_count[i] = 0;
for (i = m; i < n; i++)
state_count[to_state[i]]++;
max = 0;
default_state = 0;
for (i = 0; i < nstates; i++)
{
if (state_count[i] > max)
{
max = state_count[i];
default_state = i;
}
}
return (default_state);
}
void
save_column(symbol, default_state)
int symbol;
int default_state;
{
int i;
int m;
int n;
short *sp;
short *sp1;
short *sp2;
int count;
int symno;
m = goto_map[symbol];
n = goto_map[symbol + 1];
count = 0;
for (i = m; i < n; i++)
{
if (to_state[i] != default_state)
++count;
}
if (count == 0) return;
symno = symbol_value[symbol] + 2*nstates;
froms[symno] = sp1 = sp = NEW2(count, short);
tos[symno] = sp2 = NEW2(count, short);
for (i = m; i < n; i++)
{
if (to_state[i] != default_state)
{
*sp1++ = from_state[i];
*sp2++ = to_state[i];
}
}
tally[symno] = count;
width[symno] = sp1[-1] - sp[0] + 1;
}
void
sort_actions()
{
int i;
int j;
int k;
int t;
int w;
order = NEW2(nvectors, short);
nentries = 0;
for (i = 0; i < nvectors; i++)
{
if (tally[i] > 0)
{
t = tally[i];
w = width[i];
j = nentries - 1;
while (j >= 0 && (width[order[j]] < w))
j--;
while (j >= 0 && (width[order[j]] == w) && (tally[order[j]] < t))
j--;
for (k = nentries - 1; k > j; k--)
order[k + 1] = order[k];
order[j + 1] = i;
nentries++;
}
}
}
void
pack_table()
{
int i;
int place;
int state;
base = NEW2(nvectors, short);
pos = NEW2(nentries, short);
maxtable = 1000;
table = NEW2(maxtable, short);
check = NEW2(maxtable, short);
lowzero = 0;
high = 0;
for (i = 0; i < maxtable; i++)
check[i] = -1;
for (i = 0; i < nentries; i++)
{
state = matching_vector(i);
if (state < 0)
place = pack_vector(i);
else
place = base[state];
pos[i] = place;
base[order[i]] = place;
}
for (i = 0; i < nvectors; i++)
{
if (froms[i])
FREE(froms[i]);
if (tos[i])
FREE(tos[i]);
}
FREE(froms);
FREE(tos);
FREE(pos);
}
/* The function matching_vector determines if the vector specified by */
/* the input parameter matches a previously considered vector. The */
/* test at the start of the function checks if the vector represents */
/* a row of shifts over terminal symbols or a row of reductions, or a */
/* column of shifts over a nonterminal symbol. Berkeley Yacc does not */
/* check if a column of shifts over a nonterminal symbols matches a */
/* previously considered vector. Because of the nature of LR parsing */
/* tables, no two columns can match. Therefore, the only possible */
/* match would be between a row and a column. Such matches are */
/* unlikely. Therefore, to save time, no attempt is made to see if a */
/* column matches a previously considered vector. */
/* */
/* Matching_vector is poorly designed. The test could easily be made */
/* faster. Also, it depends on the vectors being in a specific */
/* order. */
int
matching_vector(vector)
int vector;
{
int i;
int j;
int k;
int t;
int w;
int match;
int prev;
i = order[vector];
if (i >= 2*nstates)
return (-1);
t = tally[i];
w = width[i];
for (prev = vector - 1; prev >= 0; prev--)
{
j = order[prev];
if (width[j] != w || tally[j] != t)
return (-1);
match = 1;
for (k = 0; match && k < t; k++)
{
if (tos[j][k] != tos[i][k] || froms[j][k] != froms[i][k])
match = 0;
}
if (match)
return (j);
}
return (-1);
}
int
pack_vector(vector)
int vector;
{
int i, j, k, l;
int t;
int loc;
int ok;
short *from;
short *to;
int newmax;
i = order[vector];
t = tally[i];
assert(t);
from = froms[i];
to = tos[i];
j = lowzero - from[0];
for (k = 1; k < t; ++k)
if (lowzero - from[k] > j)
j = lowzero - from[k];
for (;; ++j)
{
if (j == 0)
continue;
ok = 1;
for (k = 0; ok && k < t; k++)
{
loc = j + from[k];
if (loc >= maxtable)
{
if (loc >= MAXTABLE)
fatal("maximum table size exceeded");
newmax = maxtable;
do { newmax += 200; } while (newmax <= loc);
table = (short *) REALLOC(table, newmax*sizeof(short));
if (table == 0) no_space();
check = (short *) REALLOC(check, newmax*sizeof(short));
if (check == 0) no_space();
for (l = maxtable; l < newmax; ++l)
{
table[l] = 0;
check[l] = -1;
}
maxtable = newmax;
}
if (check[loc] != -1)
ok = 0;
}
for (k = 0; ok && k < vector; k++)
{
if (pos[k] == j)
ok = 0;
}
if (ok)
{
for (k = 0; k < t; k++)
{
loc = j + from[k];
table[loc] = to[k];
check[loc] = from[k];
if (loc > high) high = loc;
}
while (check[lowzero] != -1)
++lowzero;
return (j);
}
}
}
void
output_base()
{
int i, j;
fprintf(output_file, "short %ssindex[] = {%39d,", symbol_prefix, base[0]);
j = 10;
for (i = 1; i < nstates; i++)
{
if (j >= 10)
{
if (!rflag) ++outline;
putc('\n', output_file);
j = 1;
}
else
++j;
fprintf(output_file, "%5d,", base[i]);
}
if (!rflag) outline += 2;
fprintf(output_file, "\n};\nshort %srindex[] = {%39d,", symbol_prefix,
base[nstates]);
j = 10;
for (i = nstates + 1; i < 2*nstates; i++)
{
if (j >= 10)
{
if (!rflag) ++outline;
putc('\n', output_file);
j = 1;
}
else
++j;
fprintf(output_file, "%5d,", base[i]);
}
if (!rflag) outline += 2;
fprintf(output_file, "\n};\nshort %sgindex[] = {%39d,", symbol_prefix,
base[2*nstates]);
j = 10;
for (i = 2*nstates + 1; i < nvectors - 1; i++)
{
if (j >= 10)
{
if (!rflag) ++outline;
putc('\n', output_file);
j = 1;
}
else
++j;
fprintf(output_file, "%5d,", base[i]);
}
if (!rflag) outline += 2;
fprintf(output_file, "\n};\n");
FREE(base);
}
void
output_table()
{
int i;
int j;
++outline;
fprintf(code_file, "#define YYTABLESIZE %d\n", high);
fprintf(output_file, "short %stable[] = {%40d,", symbol_prefix,
table[0]);
j = 10;
for (i = 1; i <= high; i++)
{
if (j >= 10)
{
if (!rflag) ++outline;
putc('\n', output_file);
j = 1;
}
else
++j;
fprintf(output_file, "%5d,", table[i]);
}
if (!rflag) outline += 2;
fprintf(output_file, "\n};\n");
FREE(table);
}
void
output_check()
{
int i;
int j;
fprintf(output_file, "short %scheck[] = {%40d,", symbol_prefix,
check[0]);
j = 10;
for (i = 1; i <= high; i++)
{
if (j >= 10)
{
if (!rflag) ++outline;
putc('\n', output_file);
j = 1;
}
else
++j;
fprintf(output_file, "%5d,", check[i]);
}
if (!rflag) outline += 2;
fprintf(output_file, "\n};\n");
FREE(check);
}
int
is_C_identifier(name)
char *name;
{
char *s;
int c;
s = name;
c = *s;
if (c == '"')
{
c = *++s;
if (!isalpha(c) && c != '_' && c != '$')
return (0);
while ((c = *++s) != '"')
{
if (!isalnum(c) && c != '_' && c != '$')
return (0);
}
return (1);
}
if (!isalpha(c) && c != '_' && c != '$')
return (0);
while ((c = *++s) != '\0')
{
if (!isalnum(c) && c != '_' && c != '$')
return (0);
}
return (1);
}
void
output_defines()
{
int c, i;
char *s;
for (i = 2; i < ntokens; ++i)
{
s = symbol_name[i];
if (is_C_identifier(s))
{
fprintf(code_file, "#define ");
if (dflag) fprintf(defines_file, "#define ");
c = *s;
if (c == '"')
{
while ((c = *++s) != '"')
{
putc(c, code_file);
if (dflag) putc(c, defines_file);
}
}
else
{
do
{
putc(c, code_file);
if (dflag) putc(c, defines_file);
}
while ((c = *++s) != '\0');
}
++outline;
fprintf(code_file, " %d\n", symbol_value[i]);
if (dflag) fprintf(defines_file, " %d\n", symbol_value[i]);
}
}
++outline;
fprintf(code_file, "#define YYERRCODE %d\n", symbol_value[1]);
if (dflag && unionized)
{
fclose(union_file);
union_file = fopen(union_file_name, "r");
if (union_file == NULL) open_error(union_file_name);
while ((c = getc(union_file)) != EOF)
putc(c, defines_file);
fprintf(defines_file, " YYSTYPE;\nextern YYSTYPE %slval;\n",
symbol_prefix);
}
}
void
output_stored_text()
{
int c;
FILE *in, *out;
fclose(text_file);
text_file = fopen(text_file_name, "r");
if (text_file == NULL)
open_error(text_file_name);
in = text_file;
if ((c = getc(in)) == EOF)
return;
out = code_file;
if (c == '\n')
++outline;
putc(c, out);
while ((c = getc(in)) != EOF)
{
if (c == '\n')
++outline;
putc(c, out);
}
if (!lflag)
fprintf(out, line_format, ++outline + 1, code_file_name);
}
void
output_debug()
{
int i, j, k, max;
char **symnam, *s;
++outline;
fprintf(code_file, "#define YYFINAL %d\n", final_state);
outline += 3;
fprintf(code_file, "#ifndef YYDEBUG\n#define YYDEBUG %d\n#endif\n",
tflag);
if (rflag)
fprintf(output_file, "#ifndef YYDEBUG\n#define YYDEBUG %d\n#endif\n",
tflag);
max = 0;
for (i = 2; i < ntokens; ++i)
if (symbol_value[i] > max)
max = symbol_value[i];
++outline;
fprintf(code_file, "#define YYMAXTOKEN %d\n", max);
symnam = (char **) MALLOC((max+1)*sizeof(char *));
if (symnam == 0) no_space();
/* Note that it is not necessary to initialize the element */
/* symnam[max]. */
for (i = 0; i < max; ++i)
symnam[i] = 0;
for (i = ntokens - 1; i >= 2; --i)
symnam[symbol_value[i]] = symbol_name[i];
symnam[0] = "end-of-file";
if (!rflag) ++outline;
fprintf(output_file, "#if YYDEBUG\nchar *%sname[] = {", symbol_prefix);
j = 80;
for (i = 0; i <= max; ++i)
{
if ((s = symnam[i]) != NULL)
{
if (s[0] == '"')
{
k = 7;
while (*++s != '"')
{
++k;
if (*s == '\\')
{
k += 2;
if (*++s == '\\')
++k;
}
}
j += k;
if (j > 80)
{
if (!rflag) ++outline;
putc('\n', output_file);
j = k;
}
fprintf(output_file, "\"\\\"");
s = symnam[i];