X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/c8f002c7d3407d5c91a5882466916160a72aa8c4..b6e3facf99b007dc0ccb9c615f6d9aba8d14a73f:/src/reduce.c?ds=sidebyside diff --git a/src/reduce.c b/src/reduce.c index 7bbd8954..1bb40f01 100644 --- a/src/reduce.c +++ b/src/reduce.c @@ -1,5 +1,7 @@ /* Grammar reduction for Bison. - Copyright (C) 1988, 1989, 2000, 2001, 2002 Free Software Foundation, Inc. + + Copyright (C) 1988, 1989, 2000, 2001, 2002, 2003, 2005, 2006 Free + Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -15,8 +17,8 @@ You should have received a copy of the GNU General Public License along with Bison; see the file COPYING. If not, write to - the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ + the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, + Boston, MA 02110-1301, USA. */ /* Reduce the grammar: Find and eliminate unreachable terminals, @@ -25,17 +27,19 @@ /* Don't eliminate unreachable terminals: They may be used by the user's parser. */ +#include #include "system.h" -#include "quotearg.h" -#include "getargs.h" + +#include +#include + +#include "complain.h" #include "files.h" -#include "symtab.h" +#include "getargs.h" #include "gram.h" -#include "complain.h" -#include "reduce.h" #include "reader.h" -#include "getargs.h" -#include "bitset.h" +#include "reduce.h" +#include "symtab.h" /* Set of all nonterminals which are not useless. */ static bitset N; @@ -50,10 +54,10 @@ static bitset V; `useless', but no warning should be issued). */ static bitset V1; -static rule_number_t nuseful_productions; -rule_number_t nuseless_productions; +static rule_number nuseful_productions; +rule_number nuseless_productions; static int nuseful_nonterminals; -symbol_number_t nuseless_nonterminals; +symbol_number nuseless_nonterminals; /*-------------------------------------------------------------------. | Another way to do this would be with a set for each production and | @@ -62,17 +66,17 @@ symbol_number_t nuseless_nonterminals; `-------------------------------------------------------------------*/ static bool -useful_production (rule_number_t r, bitset N0) +useful_production (rule_number r, bitset N0) { - item_number_t *rhsp; + item_number *rhsp; /* A production is useful if all of the nonterminals in its appear in the set of useful nonterminals. */ for (rhsp = rules[r].rhs; *rhsp >= 0; ++rhsp) if (ISVAR (*rhsp) && !bitset_test (N0, *rhsp - ntokens)) - return FALSE; - return TRUE; + return false; + return true; } @@ -84,7 +88,7 @@ static void useless_nonterminals (void) { bitset Np, Ns; - rule_number_t r; + rule_number 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. */ @@ -167,7 +171,7 @@ inaccessable_symbols (void) while (1) { - rule_number_t r; + rule_number r; bitset_copy (Vp, V); for (r = 0; r < nrules; r++) { @@ -175,7 +179,7 @@ inaccessable_symbols (void) && bitset_test (P, r) && bitset_test (V, rules[r].lhs->number)) { - item_number_t *rhsp; + item_number *rhsp; for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++) if (ISTOKEN (*rhsp) || bitset_test (N, *rhsp - ntokens)) bitset_set (Vp, *rhsp); @@ -206,7 +210,7 @@ inaccessable_symbols (void) nuseful_nonterminals = 0; { - symbol_number_t i; + symbol_number i; for (i = ntokens; i < nsyms; i++) if (bitset_test (V, i)) nuseful_nonterminals++; @@ -215,7 +219,7 @@ inaccessable_symbols (void) /* A token that was used in %prec should not be warned about. */ { - rule_number_t r; + rule_number r; for (r = 0; r < nrules; ++r) if (rules[r].precsym != 0) bitset_set (V1, rules[r].precsym->number); @@ -233,7 +237,7 @@ reduce_grammar_tables (void) { /* Report and flag useless productions. */ { - rule_number_t r; + rule_number r; for (r = 0; r < nrules; r++) rules[r].useful = bitset_test (P, r); grammar_rules_never_reduced_report (_("useless rule")); @@ -244,8 +248,8 @@ reduce_grammar_tables (void) { int useful = 0; int useless = nrules - nuseless_productions; - rule_t *rules_sorted = XMALLOC (rule_t, nrules); - rule_number_t r; + rule *rules_sorted = xnmalloc (nrules, sizeof *rules_sorted); + rule_number r; for (r = 0; r < nrules; ++r) rules_sorted[rules[r].useful ? useful++ : useless++] = rules[r]; free (rules); @@ -254,7 +258,7 @@ reduce_grammar_tables (void) /* Renumber the rules markers in RITEMS. */ for (r = 0; r < nrules; ++r) { - item_number_t *rhsp = rules[r].rhs; + item_number *rhsp = rules[r].rhs; for (/* Nothing. */; *rhsp >= 0; ++rhsp) /* Nothing. */; *rhsp = rule_number_as_item_number (r); @@ -265,7 +269,7 @@ reduce_grammar_tables (void) /* Adjust NRITEMS. */ { - int r; + rule_number r; int length; for (r = nrules; r < nrules + nuseless_productions; ++r) { @@ -283,56 +287,55 @@ reduce_grammar_tables (void) static void nonterminals_reduce (void) { - symbol_number_t i, n; + symbol_number i, n; /* Map the nonterminals to their new index: useful first, useless afterwards. Kept for later report. */ - symbol_number_t *nontermmap = XCALLOC (symbol_number_t, nvars) - ntokens; + symbol_number *nontermmap = xnmalloc (nvars, sizeof *nontermmap); n = ntokens; for (i = ntokens; i < nsyms; i++) if (bitset_test (V, i)) - nontermmap[i] = n++; + nontermmap[i - ntokens] = n++; for (i = ntokens; i < nsyms; i++) if (!bitset_test (V, i)) { - nontermmap[i] = n++; - LOCATION_PRINT (stderr, symbols[i]->location); - fprintf (stderr, ": %s: %s: %s\n", - _("warning"), _("useless nonterminal"), + nontermmap[i - ntokens] = n++; + warn_at (symbols[i]->location, _("useless nonterminal: %s"), symbols[i]->tag); } /* Shuffle elements of tables indexed by symbol number. */ { - symbol_t **symbols_sorted = XMALLOC (symbol_t *, nvars) - ntokens; + symbol **symbols_sorted = xnmalloc (nvars, sizeof *symbols_sorted); for (i = ntokens; i < nsyms; i++) - symbols[i]->number = nontermmap[i]; + symbols[i]->number = nontermmap[i - ntokens]; for (i = ntokens; i < nsyms; i++) - symbols_sorted[nontermmap[i]] = symbols[i]; + symbols_sorted[nontermmap[i - ntokens] - ntokens] = symbols[i]; for (i = ntokens; i < nsyms; i++) - symbols[i] = symbols_sorted[i]; - free (symbols_sorted + ntokens); + symbols[i] = symbols_sorted[i - ntokens]; + free (symbols_sorted); } { - rule_number_t r; + rule_number r; for (r = 0; r < nrules; ++r) { - item_number_t *rhsp; + item_number *rhsp; for (rhsp = rules[r].rhs; *rhsp >= 0; ++rhsp) if (ISVAR (*rhsp)) - *rhsp = symbol_number_as_item_number (nontermmap[*rhsp]); + *rhsp = symbol_number_as_item_number (nontermmap[*rhsp + - ntokens]); } - accept->number = nontermmap[accept->number]; + accept->number = nontermmap[accept->number - ntokens]; } nsyms -= nuseless_nonterminals; nvars -= nuseless_nonterminals; - free (nontermmap + ntokens); + free (nontermmap); } @@ -353,14 +356,14 @@ reduce_output (FILE *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; + b = true; fprintf (out, " %s\n", symbols[i]->tag); } if (b) @@ -389,7 +392,7 @@ reduce_print (void) nuseless_productions), nuseless_productions); - fprintf (stderr, "%s: %s: ", infile, _("warning")); + fprintf (stderr, "%s: %s: ", grammar_file, _("warning")); if (nuseless_nonterminals > 0) fprintf (stderr, ngettext ("%d useless nonterminal", @@ -406,7 +409,6 @@ reduce_print (void) nuseless_productions), nuseless_productions); fprintf (stderr, "\n"); - fflush (stderr); } void @@ -424,7 +426,7 @@ reduce_grammar (void) useless_nonterminals (); inaccessable_symbols (); - reduced = (bool) (nuseless_nonterminals + nuseless_productions > 0); + reduced = (nuseless_nonterminals + nuseless_productions > 0); if (!reduced) return; @@ -449,7 +451,7 @@ reduce_grammar (void) fprintf (stderr, "reduced %s defines %d terminals, %d nonterminals\ , and %d productions.\n", - infile, ntokens, nvars, nrules); + grammar_file, ntokens, nvars, nrules); } }