Upgraded to Berkeley's version 1.8

This commit is contained in:
ceriel 1991-01-22 10:58:49 +00:00
parent 530ce78c37
commit 8eff53f8ea
6 changed files with 305 additions and 334 deletions

View file

@ -50,9 +50,7 @@ $(PROGRAM): $(OBJS) $(LIBS)
@$(LINKER) $(LDFLAGS) -o $(PROGRAM) $(OBJS) $(LIBS)
@echo "done"
clean:; @rm -f $(OBJS)
clobber:; @rm -f $(OBJS) $(PROGRAM)
clean:; @rm -f $(OBJS) $(PROGRAM)
index:; @ctags -wx $(HDRS) $(SRCS)

View file

@ -78,7 +78,6 @@
#define SHIFT 1
#define REDUCE 2
#define ERROR 3
/* character macros */

View file

@ -1,3 +1,4 @@
#include "defs.h"
extern short *itemset;
@ -31,124 +32,120 @@ static short *kernel_items;
allocate_itemsets()
{
register short *itemp;
register short *item_end;
register int symbol;
register int i;
register int count;
register int max;
register short *symbol_count;
register short *itemp;
register short *item_end;
register int symbol;
register int i;
register int count;
register int max;
register short *symbol_count;
count = 0;
symbol_count = NEW2(nsyms, short);
count = 0;
symbol_count = NEW2(nsyms, short);
item_end = ritem + nitems;
for (itemp = ritem; itemp < item_end; itemp++)
item_end = ritem + nitems;
for (itemp = ritem; itemp < item_end; itemp++)
{
symbol = *itemp;
if (symbol >= 0)
symbol = *itemp;
if (symbol >= 0)
{
count++;
symbol_count[symbol]++;
count++;
symbol_count[symbol]++;
}
}
kernel_base = NEW2(nsyms, short *);
kernel_items = NEW2(count, short);
kernel_base = NEW2(nsyms, short *);
kernel_items = NEW2(count, short);
count = 0;
max = 0;
for (i = 0; i < nsyms; i++)
count = 0;
max = 0;
for (i = 0; i < nsyms; i++)
{
kernel_base[i] = kernel_items + count;
count += symbol_count[i];
if (max < symbol_count[i])
max = symbol_count[i];
kernel_base[i] = kernel_items + count;
count += symbol_count[i];
if (max < symbol_count[i])
max = symbol_count[i];
}
shift_symbol = symbol_count;
kernel_end = NEW2(nsyms, short *);
shift_symbol = symbol_count;
kernel_end = NEW2(nsyms, short *);
}
allocate_storage()
{
allocate_itemsets();
shiftset = NEW2(nsyms, short);
redset = NEW2(nrules + 1, short);
state_set = NEW2(nitems, core *);
allocate_itemsets();
shiftset = NEW2(nsyms, short);
redset = NEW2(nrules + 1, short);
state_set = NEW2(nitems, core *);
}
append_states()
{
register int i;
register int j;
register int symbol;
register int i;
register int j;
register int symbol;
#ifdef TRACE
fprintf(stderr, "Entering append_states\n");
fprintf(stderr, "Entering append_states()\n");
#endif
for (i = 1; i < nshifts; i++)
for (i = 1; i < nshifts; i++)
{
symbol = shift_symbol[i];
j = i;
while (j > 0 && shift_symbol[j - 1] > symbol)
symbol = shift_symbol[i];
j = i;
while (j > 0 && shift_symbol[j - 1] > symbol)
{
shift_symbol[j] = shift_symbol[j - 1];
j--;
shift_symbol[j] = shift_symbol[j - 1];
j--;
}
shift_symbol[j] = symbol;
shift_symbol[j] = symbol;
}
for (i = 0; i < nshifts; i++)
for (i = 0; i < nshifts; i++)
{
symbol = shift_symbol[i];
shiftset[i] = get_state(symbol);
symbol = shift_symbol[i];
shiftset[i] = get_state(symbol);
}
}
free_storage()
{
FREE(shift_symbol);
FREE(redset);
FREE(shiftset);
FREE(kernel_base);
FREE(kernel_end);
FREE(kernel_items);
FREE(state_set);
FREE(shift_symbol);
FREE(redset);
FREE(shiftset);
FREE(kernel_base);
FREE(kernel_end);
FREE(kernel_items);
FREE(state_set);
}
generate_states()
{
allocate_storage();
itemset = NEW2(nitems, short);
ruleset = NEW2(WORDSIZE(nrules), unsigned);
set_first_derives();
initialize_states();
allocate_storage();
itemset = NEW2(nitems, short);
ruleset = NEW2(WORDSIZE(nrules), unsigned);
set_first_derives();
initialize_states();
while (this_state)
while (this_state)
{
closure(this_state->items, this_state->nitems);
save_reductions();
new_itemsets();
append_states();
closure(this_state->items, this_state->nitems);
save_reductions();
new_itemsets();
append_states();
if (nshifts > 0)
save_shifts();
if (nshifts > 0)
save_shifts();
this_state = this_state->next;
this_state = this_state->next;
}
finalize_closure();
free_storage();
finalize_closure();
free_storage();
}
@ -157,64 +154,63 @@ int
get_state(symbol)
int symbol;
{
register int key;
register short *isp1;
register short *isp2;
register short *iend;
register core *sp;
register int found;
int n;
register int key;
register short *isp1;
register short *isp2;
register short *iend;
register core *sp;
register int found;
register int n;
#ifdef TRACE
fprintf(stderr, "Entering get_state, symbol = %d\n", symbol);
fprintf(stderr, "Entering get_state(%d)\n", symbol);
#endif
isp1 = kernel_base[symbol];
iend = kernel_end[symbol];
n = iend - isp1;
isp1 = kernel_base[symbol];
iend = kernel_end[symbol];
n = iend - isp1;
key = *isp1;
assert(0 <= key && key < nitems);
sp = state_set[key];
if (sp)
key = *isp1;
assert(0 <= key && key < nitems);
sp = state_set[key];
if (sp)
{
found = 0;
while (!found)
found = 0;
while (!found)
{
if (sp->nitems == n)
if (sp->nitems == n)
{
found = 1;
isp1 = kernel_base[symbol];
isp2 = sp->items;
found = 1;
isp1 = kernel_base[symbol];
isp2 = sp->items;
while (found && isp1 < iend)
while (found && isp1 < iend)
{
if (*isp1++ != *isp2++)
found = 0;
if (*isp1++ != *isp2++)
found = 0;
}
}
if (!found)
if (!found)
{
if (sp->link)
if (sp->link)
{
sp = sp->link;
sp = sp->link;
}
else
else
{
sp = sp->link = new_state(symbol);
found = 1;
sp = sp->link = new_state(symbol);
found = 1;
}
}
}
}
else
else
{
state_set[key] = sp = new_state(symbol);
state_set[key] = sp = new_state(symbol);
}
return (sp->number);
return (sp->number);
}
@ -248,37 +244,36 @@ initialize_states()
new_itemsets()
{
register int i;
register int shiftcount;
register short *isp;
register short *ksp;
register int symbol;
register int i;
register int shiftcount;
register short *isp;
register short *ksp;
register int symbol;
for (i = 0; i < nsyms; i++)
kernel_end[i] = 0;
for (i = 0; i < nsyms; i++)
kernel_end[i] = 0;
shiftcount = 0;
isp = itemset;
while (isp < itemsetend)
shiftcount = 0;
isp = itemset;
while (isp < itemsetend)
{
i = *isp++;
symbol = ritem[i];
if (symbol > 0)
i = *isp++;
symbol = ritem[i];
if (symbol > 0)
{
ksp = kernel_end[symbol];
if (!ksp)
ksp = kernel_end[symbol];
if (!ksp)
{
shift_symbol[shiftcount++] = symbol;
ksp = kernel_base[symbol];
shift_symbol[shiftcount++] = symbol;
ksp = kernel_base[symbol];
}
*ksp++ = i + 1;
kernel_end[symbol] = ksp;
*ksp++ = i + 1;
kernel_end[symbol] = ksp;
}
}
nshifts = shiftcount;
nshifts = shiftcount;
}
@ -287,38 +282,38 @@ core *
new_state(symbol)
int symbol;
{
register int n;
register core *p;
register short *isp1;
register short *isp2;
register short *iend;
register int n;
register core *p;
register short *isp1;
register short *isp2;
register short *iend;
#ifdef TRACE
fprintf(stderr, "Entering new_state, symbol = %d\n", symbol);
fprintf(stderr, "Entering new_state(%d)\n", symbol);
#endif
if (nstates >= MAXSHORT)
fatal("too many states");
if (nstates >= MAXSHORT)
fatal("too many states");
isp1 = kernel_base[symbol];
iend = kernel_end[symbol];
n = iend - isp1;
isp1 = kernel_base[symbol];
iend = kernel_end[symbol];
n = iend - isp1;
p = (core *) allocate((unsigned) (sizeof(core) + (n - 1) * sizeof(short)));
p->accessing_symbol = symbol;
p->number = nstates;
p->nitems = n;
p = (core *) allocate((unsigned) (sizeof(core) + (n - 1) * sizeof(short)));
p->accessing_symbol = symbol;
p->number = nstates;
p->nitems = n;
isp2 = p->items;
while (isp1 < iend)
*isp2++ = *isp1++;
isp2 = p->items;
while (isp1 < iend)
*isp2++ = *isp1++;
last_state->next = p;
last_state = p;
last_state->next = p;
last_state = p;
nstates++;
nstates++;
return (p);
return (p);
}
@ -400,33 +395,33 @@ show_shifts()
save_shifts()
{
register shifts *p;
register short *sp1;
register short *sp2;
register short *send;
register shifts *p;
register short *sp1;
register short *sp2;
register short *send;
p = (shifts *) allocate((unsigned) (sizeof(shifts) +
p = (shifts *) allocate((unsigned) (sizeof(shifts) +
(nshifts - 1) * sizeof(short)));
p->number = this_state->number;
p->nshifts = nshifts;
p->number = this_state->number;
p->nshifts = nshifts;
sp1 = shiftset;
sp2 = p->shift;
send = shiftset + nshifts;
sp1 = shiftset;
sp2 = p->shift;
send = shiftset + nshifts;
while (sp1 < send)
*sp2++ = *sp1++;
while (sp1 < send)
*sp2++ = *sp1++;
if (last_shift)
if (last_shift)
{
last_shift->next = p;
last_shift = p;
last_shift->next = p;
last_shift = p;
}
else
else
{
first_shift = p;
last_shift = p;
first_shift = p;
last_shift = p;
}
}
@ -434,49 +429,48 @@ save_shifts()
save_reductions()
{
register short *isp;
register short *rp1;
register short *rp2;
register int item;
register int count;
register reductions *p;
register short *isp;
register short *rp1;
register short *rp2;
register int item;
register int count;
register reductions *p;
register short *rend;
short *rend;
count = 0;
for (isp = itemset; isp < itemsetend; isp++)
count = 0;
for (isp = itemset; isp < itemsetend; isp++)
{
item = ritem[*isp];
if (item < 0)
item = ritem[*isp];
if (item < 0)
{
redset[count++] = -item;
redset[count++] = -item;
}
}
if (count)
if (count)
{
p = (reductions *) allocate((unsigned) (sizeof(reductions) +
p = (reductions *) allocate((unsigned) (sizeof(reductions) +
(count - 1) * sizeof(short)));
p->number = this_state->number;
p->nreds = count;
p->number = this_state->number;
p->nreds = count;
rp1 = redset;
rp2 = p->rules;
rend = rp1 + count;
rp1 = redset;
rp2 = p->rules;
rend = rp1 + count;
while (rp1 < rend)
*rp2++ = *rp1++;
while (rp1 < rend)
*rp2++ = *rp1++;
if (last_reduction)
if (last_reduction)
{
last_reduction->next = p;
last_reduction = p;
last_reduction->next = p;
last_reduction = p;
}
else
else
{
first_reduction = p;
last_reduction = p;
first_reduction = p;
last_reduction = p;
}
}
}
@ -484,59 +478,59 @@ save_reductions()
set_derives()
{
register int i, k;
register int lhs;
register short *rules;
register int i, k;
register int lhs;
register short *rules;
derives = NEW2(nsyms, short *);
rules = NEW2(nvars + nrules, short);
derives = NEW2(nsyms, short *);
rules = NEW2(nvars + nrules, short);
k = 0;
for (lhs = start_symbol; lhs < nsyms; lhs++)
k = 0;
for (lhs = start_symbol; lhs < nsyms; lhs++)
{
derives[lhs] = rules + k;
for (i = 0; i < nrules; i++)
derives[lhs] = rules + k;
for (i = 0; i < nrules; i++)
{
if (rlhs[i] == lhs)
if (rlhs[i] == lhs)
{
rules[k] = i;
k++;
rules[k] = i;
k++;
}
}
rules[k] = -1;
k++;
rules[k] = -1;
k++;
}
#ifdef DEBUG
print_derives();
print_derives();
#endif
}
free_derives()
{
FREE(derives[start_symbol]);
FREE(derives);
FREE(derives[start_symbol]);
FREE(derives);
}
#ifdef DEBUG
print_derives()
{
register int i;
register short *sp;
register int i;
register short *sp;
printf("\nDERIVES\n\n");
printf("\nDERIVES\n\n");
for (i = start_symbol; i < nsyms; i++)
for (i = start_symbol; i < nsyms; i++)
{
printf("%s derives ", symbol_name[i]);
for (sp = derives[i]; *sp >= 0; sp++)
printf("%s derives ", symbol_name[i]);
for (sp = derives[i]; *sp >= 0; sp++)
{
printf(" %d", *sp);
printf(" %d", *sp);
}
putchar('\n');
putchar('\n');
}
putchar('\n');
putchar('\n');
}
#endif
@ -592,7 +586,7 @@ set_nullable()
free_nullable()
{
FREE(nullable);
FREE(nullable);
}

View file

@ -1,3 +1,4 @@
#include "defs.h"
action **parser;
@ -202,7 +203,7 @@ remove_conflicts()
{
register int i;
register int symbol;
register action *p, *q;
register action *p, *pref;
SRtotal = 0;
RRtotal = 0;
@ -212,16 +213,58 @@ remove_conflicts()
{
SRcount = 0;
RRcount = 0;
for (p = parser[i]; p; p = q->next)
symbol = -1;
for (p = parser[i]; p; p = p->next)
{
symbol = p->symbol;
q = p;
while (q->next && q->next->symbol == symbol)
q = q->next;
if (i == final_state && symbol == 0)
end_conflicts(p, q);
else if (p != q)
resolve_conflicts(p, q);
if (p->symbol != symbol)
{
pref = p;
symbol = p->symbol;
}
else if (i == final_state && symbol == 0)
{
SRcount++;
p->suppressed = 1;
}
else if (pref->action_code == SHIFT)
{
if (pref->prec > 0 && p->prec > 0)
{
if (pref->prec < p->prec)
{
pref->suppressed = 2;
pref = p;
}
else if (pref->prec > p->prec)
{
p->suppressed = 2;
}
else if (pref->assoc == LEFT)
{
pref->suppressed = 2;
pref = p;
}
else if (pref->assoc == RIGHT)
{
p->suppressed = 2;
}
else
{
pref->suppressed = 2;
p->suppressed = 2;
}
}
else
{
SRcount++;
p->suppressed = 1;
}
}
else
{
RRcount++;
p->suppressed = 1;
}
}
SRtotal += SRcount;
RRtotal += RRcount;
@ -231,64 +274,6 @@ remove_conflicts()
}
end_conflicts(p, q)
register action *p, *q;
{
for (;;)
{
SRcount++;
p->suppressed = 1;
if (p == q) break;
p = p->next;
}
}
resolve_conflicts(first, last)
register action *first, *last;
{
register action *p;
register int count;
count = 1;
for (p = first; p != last; p = p->next)
++count;
assert(count > 1);
if (first->action_code == SHIFT && count == 2 &&
first->prec > 0 && last->prec > 0)
{
if (first->prec == last->prec)
{
if (first->assoc == LEFT)
first->suppressed = 2;
else if (first->assoc == RIGHT)
last->suppressed = 2;
else
{
first->suppressed = 2;
last->suppressed = 2;
first->action_code = ERROR;
last->action_code = ERROR;
}
}
else if (first->prec < last->prec)
first->suppressed = 2;
else
last->suppressed = 2;
}
else
{
if (first->action_code == SHIFT)
SRcount += (count - 1);
else
RRcount += (count - 1);
for (p = first; p != last; p = p->next, p->suppressed = 1)
continue;
}
}
total_conflicts()
{
fprintf(stderr, "%s: ", myname);
@ -369,3 +354,4 @@ free_parser()
FREE(parser);
}

View file

@ -9,7 +9,7 @@
char *banner[] =
{
"#ifndef lint",
"static char yysccsid[] = \"@(#)yaccpar 1.7 (Berkeley) 09/09/90\";",
"static char yysccsid[] = \"@(#)yaccpar 1.8 (Berkeley) 01/20/90\";",
"#endif",
"#define YYBYACC 1",
0
@ -47,16 +47,16 @@ char *header[] =
"#ifdef YYMAXDEPTH",
"#define YYSTACKSIZE YYMAXDEPTH",
"#else",
"#define YYSTACKSIZE 600",
"#define YYMAXDEPTH 600",
"#define YYSTACKSIZE 200", /* ACK mod: Changed from 600 to 200 */
"#define YYMAXDEPTH 200", /* ACK mod: Changed from 600 to 200 */
"#endif",
"#endif",
"#if YYDEBUG",
"int yydebug;",
"#endif",
"int yynerrs;",
"int yyerrflag;",
"int yychar;",
"short *yyssp;",
"YYSTYPE *yyvsp;",
"YYSTYPE yyval;",
"YYSTYPE yylval;",
"short yyss[YYSTACKSIZE];",
@ -75,6 +75,8 @@ char *body[] =
"yyparse()",
"{",
" register int yym, yyn, yystate;",
" register short *yyssp;", /* ACK mod: made this a local */
" register YYSTYPE *yyvsp;", /* ACK mod: made this a local */
"#if YYDEBUG",
" register char *yys;",
" extern char *getenv();",

View file

@ -1,3 +1,4 @@
#include "defs.h"
@ -91,54 +92,44 @@ int state;
print_conflicts(state)
int state;
{
register int symbol;
register action *p, *q, *r;
register int symbol, act, number;
register action *p;
for (p = parser[state]; p; p = q->next)
symbol = -1;
for (p = parser[state]; p; p = p->next)
{
q = p;
if (p->action_code == ERROR || p->suppressed == 2)
if (p->suppressed == 2)
continue;
symbol = p->symbol;
while (q->next && q->next->symbol == symbol)
q = q->next;
if (state == final_state && symbol == 0)
if (p->symbol != symbol)
{
r = p;
for (;;)
symbol = p->symbol;
number = p->number;
if (p->action_code == SHIFT)
act = SHIFT;
else
act = REDUCE;
}
else if (p->suppressed == 1)
{
if (state == final_state && symbol == 0)
{
fprintf(verbose_file, "%d: shift/reduce conflict \
(accept, reduce %d) on $end\n", state, r->number - 2);
if (r == q) break;
r = r->next;
}
}
else if (p != q)
{
r = p->next;
if (p->action_code == SHIFT)
{
for (;;)
{
if (r->action_code == REDUCE && p->suppressed != 2)
fprintf(verbose_file, "%d: shift/reduce conflict \
(shift %d, reduce %d) on %s\n", state, p->number, r->number - 2,
symbol_name[symbol]);
if (r == q) break;
r = r->next;
}
(accept, reduce %d) on $end\n", state, p->number - 2);
}
else
{
for (;;)
if (act == SHIFT)
{
if (r->action_code == REDUCE && p->suppressed != 2)
fprintf(verbose_file, "%d: reduce/reduce conflict \
(reduce %d, reduce %d) on %s\n", state, p->number - 2, r->number - 2,
symbol_name[symbol]);
if (r == q) break;
r = r->next;
fprintf(verbose_file, "%d: shift/reduce conflict \
(shift %d, reduce %d) on %s\n", state, number, p->number - 2,
symbol_name[symbol]);
}
else
{
fprintf(verbose_file, "%d: reduce/reduce conflict \
(reduce %d, reduce %d) on %s\n", state, number - 2, p->number - 2,
symbol_name[symbol]);
}
}
}
@ -335,3 +326,4 @@ int stateno;
fprintf(verbose_file, "\t%s goto %d\n", symbol_name[as], k);
}
}