X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/c3b407f430a6c4bab6f0ef5160bb0c34290f3abb..78bcec17c82fe777c90f86717773de35bb5018e7:/src/reduce.c diff --git a/src/reduce.c b/src/reduce.c index b7a7f456..3b19cc12 100644 --- a/src/reduce.c +++ b/src/reduce.c @@ -1,5 +1,5 @@ /* Grammar reduction for Bison. - Copyright 1988, 1989, 2000, 2001 Free Software Foundation, Inc. + Copyright (C) 1988, 1989, 2000, 2001, 2002 Free Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -26,6 +26,7 @@ user's parser. */ #include "system.h" +#include "quotearg.h" #include "getargs.h" #include "files.h" #include "symtab.h" @@ -36,9 +37,6 @@ #include "getargs.h" #include "bitset.h" -typedef short *rule; - - /* Set of all nonterminals which are not useless. */ static bitset N; @@ -52,10 +50,10 @@ static bitset V; `useless', but no warning should be issued). */ static bitset V1; -static int nuseful_productions; -static int nuseless_productions; +static rule_number_t nuseful_productions; +rule_number_t nuseless_productions; static int nuseful_nonterminals; -int nuseless_nonterminals; +symbol_number_t nuseless_nonterminals; /*-------------------------------------------------------------------. | Another way to do this would be with a set for each production and | @@ -64,18 +62,17 @@ int nuseless_nonterminals; `-------------------------------------------------------------------*/ static bool -useful_production (int i, bitset N0) +useful_production (rule_number_t r, bitset N0) { - rule r; - short n; + item_number_t *rhsp; /* A production is useful if all of the nonterminals in its appear in the set of useful nonterminals. */ - for (r = rules[i].rhs; *r >= 0; r++) - if (ISVAR (n = *r) && !bitset_test (N0, n - ntokens)) - return FALSE; - return TRUE; + for (rhsp = rules[r].rhs; *rhsp >= 0; ++rhsp) + if (ISVAR (*rhsp) && !bitset_test (N0, *rhsp - ntokens)) + return false; + return true; } @@ -87,7 +84,7 @@ static void useless_nonterminals (void) { bitset Np, Ns; - int i; + rule_number_t r; /* N is set as built. Np is set being built this iteration. P is set of all productions which have a RHS all in N. */ @@ -114,12 +111,12 @@ useless_nonterminals (void) while (1) { bitset_copy (Np, N); - for (i = 1; i < nrules + 1; i++) - if (!bitset_test (P, i) - && useful_production (i, N)) + for (r = 0; r < nrules; r++) + if (!bitset_test (P, r) + && useful_production (r, N)) { - bitset_set (Np, rules[i].lhs - ntokens); - bitset_set (P, i); + bitset_set (Np, rules[r].lhs->number - ntokens); + bitset_set (P, r); } if (bitset_equal_p (N, Np)) break; @@ -136,9 +133,6 @@ static void inaccessable_symbols (void) { bitset Vp, Vs, Pp; - int i; - short t; - rule r; /* Find out which productions are reachable and which symbols are used. Starting with an empty set of productions and a set of @@ -164,26 +158,28 @@ inaccessable_symbols (void) user can know. */ Vp = bitset_create (nsyms, BITSET_FIXED); - Pp = bitset_create (nrules + 1, BITSET_FIXED); + Pp = bitset_create (nrules, BITSET_FIXED); /* If the start symbol isn't useful, then nothing will be useful. */ - if (bitset_test (N, start_symbol - ntokens)) + if (bitset_test (N, accept->number - ntokens)) { - bitset_set (V, start_symbol); + bitset_set (V, accept->number); while (1) { + rule_number_t r; bitset_copy (Vp, V); - for (i = 1; i < nrules + 1; i++) + for (r = 0; r < nrules; r++) { - if (!bitset_test (Pp, i) - && bitset_test (P, i) - && bitset_test (V, rules[i].lhs)) + if (!bitset_test (Pp, r) + && bitset_test (P, r) + && bitset_test (V, rules[r].lhs->number)) { - for (r = rules[i].rhs; *r >= 0; r++) - if (ISTOKEN (t = *r) || bitset_test (N, t - ntokens)) - bitset_set (Vp, t); - bitset_set (Pp, i); + item_number_t *rhsp; + for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++) + if (ISTOKEN (*rhsp) || bitset_test (N, *rhsp - ntokens)) + bitset_set (Vp, *rhsp); + bitset_set (Pp, r); } } if (bitset_equal_p (V, Vp)) @@ -198,9 +194,9 @@ inaccessable_symbols (void) V = Vp; /* Tokens 0, 1, and 2 are internal to Bison. Consider them useful. */ - bitset_set (V, 0); /* end-of-input token */ - bitset_set (V, 1); /* error token */ - bitset_set (V, 2); /* some undefined token */ + bitset_set (V, endtoken->number); /* end-of-input token */ + bitset_set (V, errtoken->number); /* error token */ + bitset_set (V, undeftoken->number); /* some undefined token */ bitset_free (P); P = Pp; @@ -209,15 +205,21 @@ inaccessable_symbols (void) nuseless_productions = nrules - nuseful_productions; nuseful_nonterminals = 0; - for (i = ntokens; i < nsyms; i++) - if (bitset_test (V, i)) - nuseful_nonterminals++; + { + symbol_number_t i; + for (i = ntokens; i < nsyms; i++) + if (bitset_test (V, i)) + nuseful_nonterminals++; + } nuseless_nonterminals = nvars - nuseful_nonterminals; /* A token that was used in %prec should not be warned about. */ - for (i = 1; i < nrules + 1; i++) - if (rules[i].precsym != 0) - bitset_set (V1, rules[i].precsym); + { + rule_number_t r; + for (r = 0; r < nrules; ++r) + if (rules[r].precsym != 0) + bitset_set (V1, rules[r].precsym->number); + } } @@ -229,53 +231,46 @@ inaccessable_symbols (void) static void reduce_grammar_tables (void) { - /* Flag useless productions. */ + /* Report and flag useless productions. */ { - int pn; - for (pn = 1; pn < nrules + 1; pn++) - rules[pn].useful = bitset_test (P, pn); + rule_number_t r; + for (r = 0; r < nrules; r++) + rules[r].useful = bitset_test (P, r); + grammar_rules_never_reduced_report (_("useless rule")); } /* Map the nonterminals to their new index: useful first, useless afterwards. Kept for later report. */ { - int useful = 1; - int useless = nrules + 1 - nuseless_productions; - rule_t *rules_sorted = XMALLOC (rule_t, nrules + 1) - 1; - int i; - for (i = 1; i < nrules + 1; ++i) - rules_sorted[rules[i].useful ? useful++ : useless++] = rules[i]; - free (rules + 1); + int useful = 0; + int useless = nrules - nuseless_productions; + rule_t *rules_sorted = XMALLOC (rule_t, nrules); + rule_number_t r; + for (r = 0; r < nrules; ++r) + rules_sorted[rules[r].useful ? useful++ : useless++] = rules[r]; + free (rules); rules = rules_sorted; - /* Also reorder ritems. */ - { - short *ritems_sorted = XCALLOC (short, nitems + 1); - short *ritemsp = ritems_sorted; - for (i = 1; i < nrules + 1; ++i) - { - short *rhsp = rules[i].rhs; - rules[i].rhs = ritemsp; - for (/* Nothing. */; *rhsp >= 0; ++rhsp) - *ritemsp++ = *rhsp; - *ritemsp++ = -i; - } - *ritemsp++ = 0; - free (ritem); - ritem = ritems_sorted; - } + /* Renumber the rules markers in RITEMS. */ + for (r = 0; r < nrules; ++r) + { + item_number_t *rhsp = rules[r].rhs; + for (/* Nothing. */; *rhsp >= 0; ++rhsp) + /* Nothing. */; + *rhsp = rule_number_as_item_number (r); + rules[r].number = r; + } nrules -= nuseless_productions; } - /* Adjust NRITEMS and NITEMS. */ + /* Adjust NRITEMS. */ { int r; int length; - for (r = nrules + 1; r < nrules + 1 + nuseless_productions; ++r) + for (r = nrules; r < nrules + nuseless_productions; ++r) { length = rule_rhs_length (&rules[r]); nritems -= length + 1; - nitems -= length + 1; } } } @@ -288,25 +283,33 @@ reduce_grammar_tables (void) static void nonterminals_reduce (void) { - int i, n; + symbol_number_t i, n; /* Map the nonterminals to their new index: useful first, useless afterwards. Kept for later report. */ - short *nontermmap = XCALLOC (short, nvars) - ntokens; + symbol_number_t *nontermmap = XCALLOC (symbol_number_t, nvars) - ntokens; n = ntokens; for (i = ntokens; i < nsyms; i++) if (bitset_test (V, i)) nontermmap[i] = n++; for (i = ntokens; i < nsyms; i++) if (!bitset_test (V, i)) - nontermmap[i] = n++; + { + nontermmap[i] = n++; + LOCATION_PRINT (stderr, symbols[i]->location); + fprintf (stderr, ": %s: %s: %s\n", + _("warning"), _("useless nonterminal"), + symbols[i]->tag); + } /* Shuffle elements of tables indexed by symbol number. */ { - bucket **symbols_sorted = XMALLOC (bucket *, nvars) - ntokens; + symbol_t **symbols_sorted = XMALLOC (symbol_t *, nvars) - ntokens; + for (i = ntokens; i < nsyms; i++) + symbols[i]->number = nontermmap[i]; for (i = ntokens; i < nsyms; i++) symbols_sorted[nontermmap[i]] = symbols[i]; for (i = ntokens; i < nsyms; i++) @@ -314,21 +317,17 @@ nonterminals_reduce (void) free (symbols_sorted + ntokens); } - /* Replace all symbol numbers in valid data structures. */ - - for (i = 1; i < nrules + 1; i++) - { - rules[i].lhs = nontermmap[rules[i].lhs]; - if (ISVAR (rules[i].precsym)) - /* Can this happen? */ - rules[i].precsym = nontermmap[rules[i].precsym]; - } - - for (i = 0; i < nritems; ++i) - if (ISVAR (ritem[i])) - ritem[i] = nontermmap[ritem[i]]; - - start_symbol = nontermmap[start_symbol]; + { + rule_number_t r; + for (r = 0; r < nrules; ++r) + { + item_number_t *rhsp; + for (rhsp = rules[r].rhs; *rhsp >= 0; ++rhsp) + if (ISVAR (*rhsp)) + *rhsp = symbol_number_as_item_number (nontermmap[*rhsp]); + } + accept->number = nontermmap[accept->number]; + } nsyms -= nuseless_nonterminals; nvars -= nuseless_nonterminals; @@ -347,21 +346,21 @@ reduce_output (FILE *out) if (nuseless_nonterminals > 0) { int i; - fprintf (out, "%s\n\n", _("Useless nonterminals:")); + fprintf (out, "%s\n\n", _("Useless nonterminals")); for (i = 0; i < nuseless_nonterminals; ++i) fprintf (out, " %s\n", symbols[nsyms + i]->tag); fputs ("\n\n", out); } { - bool b = FALSE; + bool b = false; int i; for (i = 0; i < ntokens; i++) if (!bitset_test (V, i) && !bitset_test (V1, i)) { if (!b) - fprintf (out, "%s\n\n", _("Terminals which are not used:")); - b = TRUE; + fprintf (out, "%s\n\n", _("Terminals which are not used")); + b = true; fprintf (out, " %s\n", symbols[i]->tag); } if (b) @@ -369,68 +368,11 @@ reduce_output (FILE *out) } if (nuseless_productions > 0) - { - int i; - fprintf (out, "%s\n\n", _("Useless rules:")); - for (i = nrules + 1; i < nuseless_productions + nrules + 1; i++) - { - rule r; - fprintf (out, "#%-4d ", rules[i].number - 1); - fprintf (out, "%s:", symbols[rules[i].lhs]->tag); - for (r = rules[i].rhs; *r >= 0; r++) - fprintf (out, " %s", symbols[*r]->tag); - fputs (";\n", out); - } - fputs ("\n\n", out); - } + grammar_rules_partial_print (out, _("Useless rules"), + rule_useless_p); } -static void -dump_grammar (FILE *out) -{ - int i; - rule r; - - fprintf (out, "REDUCED GRAMMAR\n\n"); - fprintf (out, - "ntokens = %d, nvars = %d, nsyms = %d, nrules = %d, nitems = %d\n\n", - ntokens, nvars, nsyms, nrules, nitems); - fprintf (out, "Variables\n---------\n\n"); - fprintf (out, "Value Sprec Sassoc Tag\n"); - for (i = ntokens; i < nsyms; i++) - fprintf (out, "%5d %5d %5d %s\n", - i, - symbols[i]->prec, symbols[i]->assoc, symbols[i]->tag); - fprintf (out, "\n\n"); - fprintf (out, "Rules\n-----\n\n"); - fprintf (out, "Num (Prec, Assoc, Useful, Ritem Range) Lhs -> Rhs (Ritem range) [Num]\n"); - for (i = 1; i < nrules + nuseless_productions + 1; i++) - { - int rhs_count = 0; - /* Find the last RHS index in ritems. */ - for (r = rules[i].rhs; *r >= 0; ++r) - ++rhs_count; - fprintf (out, "%3d (%2d, %2d, %2d, %2d-%2d) %2d ->", - i - 1, - rules[i].prec, rules[i].assoc, rules[i].useful, - rules[i].rhs - ritem, rules[i].rhs - ritem + rhs_count - 1, - rules[i].lhs); - /* Dumped the RHS. */ - for (r = rules[i].rhs; *r >= 0; r++) - fprintf (out, "%3d", *r); - fprintf (out, " [%d]\n", -(*r) - 1); - } - fprintf (out, "\n\n"); - fprintf (out, "Rules interpreted\n-----------------\n\n"); - for (i = 1; i < nrules + nuseless_productions + 1; i++) - { - fprintf (out, "%-5d %s :", i, symbols[rules[i].lhs]->tag); - for (r = rules[i].rhs; *r >= 0; r++) - fprintf (out, " %s", symbols[*r]->tag); - fputc ('\n', out); - } - fprintf (out, "\n\n"); -} + @@ -447,7 +389,7 @@ reduce_print (void) nuseless_productions), nuseless_productions); - fprintf (stderr, _("%s contains "), infile); + fprintf (stderr, "%s: %s: ", infile, _("warning")); if (nuseless_nonterminals > 0) fprintf (stderr, ngettext ("%d useless nonterminal", @@ -475,7 +417,7 @@ reduce_grammar (void) /* Allocate the global sets used to compute the reduced grammar */ N = bitset_create (nvars, BITSET_FIXED); - P = bitset_create (nrules + 1, BITSET_FIXED); + P = bitset_create (nrules, BITSET_FIXED); V = bitset_create (nsyms, BITSET_FIXED); V1 = bitset_create (nsyms, BITSET_FIXED); @@ -488,18 +430,22 @@ reduce_grammar (void) reduce_print (); - if (!bitset_test (N, start_symbol - ntokens)) - fatal (_("Start symbol %s does not derive any sentence"), - symbols[start_symbol]->tag); + if (!bitset_test (N, accept->number - ntokens)) + fatal_at (startsymbol_location, + _("start symbol %s does not derive any sentence"), + startsymbol->tag); - if (nuseless_productions > 0) - reduce_grammar_tables (); + /* First reduce the nonterminals, as they renumber themselves in the + whole grammar. If you change the order, nonterms would be + renumbered only in the reduced grammar. */ if (nuseless_nonterminals > 0) nonterminals_reduce (); + if (nuseless_productions > 0) + reduce_grammar_tables (); - if (trace_flag) + if (trace_flag & trace_grammar) { - dump_grammar (stderr); + grammar_dump (stderr, "Reduced Grammar"); fprintf (stderr, "reduced %s defines %d terminals, %d nonterminals\ , and %d productions.\n",