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output.c
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/* $Id: output.c,v 1.81 2017/04/30 23:23:32 tom Exp $ */
#include "defs.h"
#define StaticOrR (rflag ? "" : "static ")
#define CountLine(fp) (!rflag || ((fp) == code_file))
#if defined(YYBTYACC)
#define PER_STATE 3
#else
#define PER_STATE 2
#endif
static int nvectors;
static int nentries;
static Value_t **froms;
static Value_t **tos;
#if defined(YYBTYACC)
static Value_t *conflicts = NULL;
static Value_t nconflicts = 0;
#endif
static Value_t *tally;
static Value_t *width;
static Value_t *state_count;
static Value_t *order;
static Value_t *base;
static Value_t *pos;
static int maxtable;
static Value_t *table;
static Value_t *check;
static int lowzero;
static long high;
static void
putc_code(FILE * fp, int c)
{
if ((c == '\n') && (fp == code_file))
++outline;
putc(c, fp);
}
static void
putl_code(FILE * fp, const char *s)
{
if (fp == code_file)
++outline;
fputs(s, fp);
}
static void
puts_code(FILE * fp, const char *s)
{
fputs(s, fp);
}
static void
puts_param_types(FILE * fp, param *list, int more)
{
param *p;
if (list != 0)
{
for (p = list; p; p = p->next)
{
size_t len_type = strlen(p->type);
fprintf(fp, "%s%s%s%s%s", p->type,
(((len_type != 0) && (p->type[len_type - 1] == '*'))
? ""
: " "),
p->name, p->type2,
((more || p->next) ? ", " : ""));
}
}
else
{
if (!more)
fprintf(fp, "void");
}
}
static void
puts_param_names(FILE * fp, param *list, int more)
{
param *p;
for (p = list; p; p = p->next)
{
fprintf(fp, "%s%s", p->name,
((more || p->next) ? ", " : ""));
}
}
static void
write_code_lineno(FILE * fp)
{
if (!lflag && (fp == code_file))
{
++outline;
fprintf(fp, line_format, outline + 1, code_file_name);
}
}
static void
write_input_lineno(void)
{
if (!lflag)
{
++outline;
fprintf(code_file, line_format, lineno, input_file_name);
}
}
static void
define_prefixed(FILE * fp, const char *name)
{
int bump_line = CountLine(fp);
if (bump_line)
++outline;
fprintf(fp, "\n");
if (bump_line)
++outline;
fprintf(fp, "#ifndef %s\n", name);
if (bump_line)
++outline;
fprintf(fp, "#define %-10s %s%s\n", name, symbol_prefix, name + 2);
if (bump_line)
++outline;
fprintf(fp, "#endif /* %s */\n", name);
}
static void
output_prefix(FILE * fp)
{
if (symbol_prefix == NULL)
{
symbol_prefix = "yy";
}
else
{
define_prefixed(fp, "yyparse");
define_prefixed(fp, "yylex");
define_prefixed(fp, "yyerror");
define_prefixed(fp, "yychar");
define_prefixed(fp, "yyval");
define_prefixed(fp, "yylval");
define_prefixed(fp, "yydebug");
define_prefixed(fp, "yynerrs");
define_prefixed(fp, "yyerrflag");
define_prefixed(fp, "yylhs");
define_prefixed(fp, "yylen");
define_prefixed(fp, "yydefred");
#if defined(YYBTYACC)
define_prefixed(fp, "yystos");
#endif
define_prefixed(fp, "yydgoto");
define_prefixed(fp, "yysindex");
define_prefixed(fp, "yyrindex");
define_prefixed(fp, "yygindex");
define_prefixed(fp, "yytable");
define_prefixed(fp, "yycheck");
define_prefixed(fp, "yyname");
define_prefixed(fp, "yyrule");
#if defined(YYBTYACC)
if (locations)
{
define_prefixed(fp, "yyloc");
define_prefixed(fp, "yylloc");
}
putc_code(fp, '\n');
putl_code(fp, "#if YYBTYACC\n");
define_prefixed(fp, "yycindex");
define_prefixed(fp, "yyctable");
putc_code(fp, '\n');
putl_code(fp, "#endif /* YYBTYACC */\n");
putc_code(fp, '\n');
#endif
}
if (CountLine(fp))
++outline;
fprintf(fp, "#define YYPREFIX \"%s\"\n", symbol_prefix);
}
static void
output_newline(void)
{
if (!rflag)
++outline;
putc('\n', output_file);
}
static void
output_line(const char *value)
{
fputs(value, output_file);
output_newline();
}
static void
output_int(int value)
{
fprintf(output_file, "%5d,", value);
}
static void
start_int_table(const char *name, int value)
{
int need = 34 - (int)(strlen(symbol_prefix) + strlen(name));
if (need < 6)
need = 6;
fprintf(output_file,
"%sconst YYINT %s%s[] = {%*d,",
StaticOrR, symbol_prefix, name, need, value);
}
static void
start_str_table(const char *name)
{
fprintf(output_file,
"%sconst char *const %s%s[] = {",
StaticOrR, symbol_prefix, name);
output_newline();
}
static void
end_table(void)
{
output_newline();
output_line("};");
}
static void
output_stype(FILE * fp)
{
if (!unionized && ntags == 0)
{
putc_code(fp, '\n');
putl_code(fp, "#if "
"! defined(YYSTYPE) && "
"! defined(YYSTYPE_IS_DECLARED)\n");
putl_code(fp, "/* Default: YYSTYPE is the semantic value type. */\n");
putl_code(fp, "typedef int YYSTYPE;\n");
putl_code(fp, "# define YYSTYPE_IS_DECLARED 1\n");
putl_code(fp, "#endif\n");
}
}
#if defined(YYBTYACC)
static void
output_ltype(FILE * fp)
{
putc_code(fp, '\n');
putl_code(fp, "#if ! defined YYLTYPE && ! defined YYLTYPE_IS_DECLARED\n");
putl_code(fp, "/* Default: YYLTYPE is the text position type. */\n");
putl_code(fp, "typedef struct YYLTYPE\n");
putl_code(fp, "{\n");
putl_code(fp, " int first_line;\n");
putl_code(fp, " int first_column;\n");
putl_code(fp, " int last_line;\n");
putl_code(fp, " int last_column;\n");
putl_code(fp, " unsigned source;\n");
putl_code(fp, "} YYLTYPE;\n");
putl_code(fp, "#define YYLTYPE_IS_DECLARED 1\n");
putl_code(fp, "#endif\n");
putl_code(fp, "#define YYRHSLOC(rhs, k) ((rhs)[k])\n");
}
#endif
static void
output_YYINT_typedef(FILE * fp)
{
/* generate the type used to index the various parser tables */
if (CountLine(fp))
++outline;
fprintf(fp, "typedef %s YYINT;\n", CONCAT1("", YYINT));
}
static void
output_rule_data(void)
{
int i;
int j;
output_YYINT_typedef(output_file);
start_int_table("lhs", symbol_value[start_symbol]);
j = 10;
for (i = 3; i < nrules; i++)
{
if (j >= 10)
{
output_newline();
j = 1;
}
else
++j;
output_int(symbol_value[rlhs[i]]);
}
end_table();
start_int_table("len", 2);
j = 10;
for (i = 3; i < nrules; i++)
{
if (j >= 10)
{
output_newline();
j = 1;
}
else
j++;
output_int(rrhs[i + 1] - rrhs[i] - 1);
}
end_table();
}
static void
output_yydefred(void)
{
int i, j;
start_int_table("defred", (defred[0] ? defred[0] - 2 : 0));
j = 10;
for (i = 1; i < nstates; i++)
{
if (j < 10)
++j;
else
{
output_newline();
j = 1;
}
output_int((defred[i] ? defred[i] - 2 : 0));
}
end_table();
}
#if defined(YYBTYACC)
static void
output_accessing_symbols(void)
{
int i, j;
int *translate;
if (nstates != 0)
{
translate = TMALLOC(int, nstates);
NO_SPACE(translate);
for (i = 0; i < nstates; ++i)
{
int gsymb = accessing_symbol[i];
translate[i] = symbol_pval[gsymb];
}
putl_code(output_file,
"#if defined(YYDESTRUCT_CALL) || defined(YYSTYPE_TOSTRING)\n");
/* yystos[] may be unused, depending on compile-time defines */
start_int_table("stos", translate[0]);
j = 10;
for (i = 1; i < nstates; ++i)
{
if (j < 10)
++j;
else
{
output_newline();
j = 1;
}
output_int(translate[i]);
}
end_table();
FREE(translate);
putl_code(output_file,
"#endif /* YYDESTRUCT_CALL || YYSTYPE_TOSTRING */\n");
}
}
static Value_t
find_conflict_base(int cbase)
{
int i, j;
for (i = 0; i < cbase; i++)
{
for (j = 0; j + cbase < nconflicts; j++)
{
if (conflicts[i + j] != conflicts[cbase + j])
break;
}
if (j + cbase >= nconflicts)
break;
}
return (Value_t)i;
}
#endif
static void
token_actions(void)
{
int i, j;
Value_t shiftcount, reducecount;
#if defined(YYBTYACC)
Value_t conflictcount = 0;
Value_t csym = -1;
Value_t cbase = 0;
#endif
int max, min;
Value_t *actionrow, *r, *s;
action *p;
actionrow = NEW2(PER_STATE * ntokens, Value_t);
for (i = 0; i < nstates; ++i)
{
if (parser[i])
{
for (j = 0; j < PER_STATE * ntokens; ++j)
actionrow[j] = 0;
shiftcount = 0;
reducecount = 0;
#if defined(YYBTYACC)
if (backtrack)
{
conflictcount = 0;
csym = -1;
cbase = nconflicts;
}
#endif
for (p = parser[i]; p; p = p->next)
{
#if defined(YYBTYACC)
if (backtrack)
{
if (csym != -1 && csym != p->symbol)
{
conflictcount++;
conflicts[nconflicts++] = -1;
j = find_conflict_base(cbase);
actionrow[csym + 2 * ntokens] = (Value_t)(j + 1);
if (j == cbase)
{
cbase = nconflicts;
}
else
{
if (conflicts[cbase] == -1)
cbase++;
nconflicts = cbase;
}
csym = -1;
}
}
#endif
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;
}
}
#if defined(YYBTYACC)
else if (backtrack && p->suppressed == 1)
{
csym = p->symbol;
if (p->action_code == SHIFT)
{
conflicts[nconflicts++] = p->number;
}
else if (p->action_code == REDUCE && p->number != defred[i])
{
if (cbase == nconflicts)
{
if (cbase)
cbase--;
else
conflicts[nconflicts++] = -1;
}
conflicts[nconflicts++] = (Value_t)(p->number - 2);
}
}
#endif
}
#if defined(YYBTYACC)
if (backtrack && csym != -1)
{
conflictcount++;
conflicts[nconflicts++] = -1;
j = find_conflict_base(cbase);
actionrow[csym + 2 * ntokens] = (Value_t)(j + 1);
if (j == cbase)
{
cbase = nconflicts;
}
else
{
if (conflicts[cbase] == -1)
cbase++;
nconflicts = cbase;
}
}
#endif
tally[i] = shiftcount;
tally[nstates + i] = reducecount;
#if defined(YYBTYACC)
if (backtrack)
tally[2 * nstates + i] = conflictcount;
#endif
width[i] = 0;
width[nstates + i] = 0;
#if defined(YYBTYACC)
if (backtrack)
width[2 * nstates + i] = 0;
#endif
if (shiftcount > 0)
{
froms[i] = r = NEW2(shiftcount, Value_t);
tos[i] = s = NEW2(shiftcount, Value_t);
min = MAXYYINT;
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] = (Value_t)(max - min + 1);
}
if (reducecount > 0)
{
froms[nstates + i] = r = NEW2(reducecount, Value_t);
tos[nstates + i] = s = NEW2(reducecount, Value_t);
min = MAXYYINT;
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++ = (Value_t)(actionrow[ntokens + j] - 2);
}
}
width[nstates + i] = (Value_t)(max - min + 1);
}
#if defined(YYBTYACC)
if (backtrack && conflictcount > 0)
{
froms[2 * nstates + i] = r = NEW2(conflictcount, Value_t);
tos[2 * nstates + i] = s = NEW2(conflictcount, Value_t);
min = MAXYYINT;
max = 0;
for (j = 0; j < ntokens; ++j)
{
if (actionrow[2 * 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++ = (Value_t)(actionrow[2 * ntokens + j] - 1);
}
}
width[2 * nstates + i] = (Value_t)(max - min + 1);
}
#endif
}
}
FREE(actionrow);
}
static int
default_goto(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);
}
static void
save_column(int symbol, int default_state)
{
int i;
int m;
int n;
Value_t *sp;
Value_t *sp1;
Value_t *sp2;
Value_t 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] + PER_STATE * nstates;
froms[symno] = sp1 = sp = NEW2(count, Value_t);
tos[symno] = sp2 = NEW2(count, Value_t);
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] = (Value_t)(sp1[-1] - sp[0] + 1);
}
static void
goto_actions(void)
{
int i, j, k;
state_count = NEW2(nstates, Value_t);
k = default_goto(start_symbol + 1);
start_int_table("dgoto", k);
save_column(start_symbol + 1, k);
j = 10;
for (i = start_symbol + 2; i < nsyms; i++)
{
if (j >= 10)
{
output_newline();
j = 1;
}
else
++j;
k = default_goto(i);
output_int(k);
save_column(i, k);
}
end_table();
FREE(state_count);
}
static void
sort_actions(void)
{
Value_t i;
int j;
int k;
int t;
int w;
order = NEW2(nvectors, Value_t);
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++;
}
}
}
/* 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. */
#if defined(YYBTYACC)
/* */
/* Not really any point in checking for matching conflicts -- it is */
/* extremely unlikely to occur, and conflicts are (hopefully) rare. */
#endif
static int
matching_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);
}
static int
pack_vector(int vector)
{
int i, j, k, l;
int t;
int loc;
int ok;
Value_t *from;
Value_t *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 - 1)
{
if (loc >= MAXTABLE - 1)
fatal("maximum table size exceeded");
newmax = maxtable;
do
{
newmax += 200;
}
while (newmax <= loc);
table = TREALLOC(Value_t, table, newmax);
NO_SPACE(table);
check = TREALLOC(Value_t, check, newmax);
NO_SPACE(check);
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);
}
}
}
static void
pack_table(void)
{
int i;
Value_t place;
int state;
base = NEW2(nvectors, Value_t);
pos = NEW2(nentries, Value_t);
maxtable = 1000;
table = NEW2(maxtable, Value_t);
check = NEW2(maxtable, Value_t);
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 = (Value_t)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]);
}
DO_FREE(froms);
DO_FREE(tos);
DO_FREE(tally);
DO_FREE(width);
DO_FREE(pos);
}
static void
output_base(void)
{
int i, j;
start_int_table("sindex", base[0]);
j = 10;
for (i = 1; i < nstates; i++)
{
if (j >= 10)
{
output_newline();
j = 1;
}
else
++j;
output_int(base[i]);
}
end_table();
start_int_table("rindex", base[nstates]);
j = 10;
for (i = nstates + 1; i < 2 * nstates; i++)
{
if (j >= 10)
{
output_newline();
j = 1;
}
else
++j;
output_int(base[i]);
}
end_table();
#if defined(YYBTYACC)
output_line("#if YYBTYACC");
start_int_table("cindex", base[2 * nstates]);
j = 10;
for (i = 2 * nstates + 1; i < 3 * nstates; i++)
{
if (j >= 10)
{
output_newline();
j = 1;
}
else
++j;
output_int(base[i]);
}
end_table();
output_line("#endif");
#endif