X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/b0f4c4eaa1da1437b18d5d8e250d666133225d8a..4654b0c0a8a355e7a8fcdf51b1a5eb6c485126f1:/src/reader.c?ds=sidebyside diff --git a/src/reader.c b/src/reader.c index d5cd629f..7758c772 100644 --- a/src/reader.c +++ b/src/reader.c @@ -1,24 +1,22 @@ /* Input parser for Bison Copyright (C) 1984, 1986, 1989, 1992, 1998, 2000, 2001, 2002, 2003, - 2005, 2006 Free Software Foundation, Inc. + 2005, 2006, 2007 Free Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. - Bison is free software; you can redistribute it and/or modify + This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2, or (at your option) - any later version. + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. - Bison is distributed in the hope that it will be useful, + This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 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., 51 Franklin Street, Fifth Floor, - Boston, MA 02110-1301, USA. */ + along with this program. If not, see . */ #include #include "system.h" @@ -69,27 +67,6 @@ grammar_start_symbol_set (symbol *sym, location loc) } } - -/*---------------------------------------------------------------------. -| There are two prologues: one before the first %union and one after. | -| Augment the one specified by POST. | -`---------------------------------------------------------------------*/ - -void -prologue_augment (const char *prologue, location loc, bool post) -{ - struct obstack *oout = - !post ? &pre_prologue_obstack : &post_prologue_obstack; - - obstack_fgrow1 (oout, "]b4_syncline(%d, [[", loc.start.line); - /* FIXME: Protection of M4 characters missing here. See - output.c:escaped_output. */ - MUSCLE_OBSTACK_SGROW (oout, - quotearg_style (c_quoting_style, loc.start.file)); - obstack_sgrow (oout, "]])[\n"); - obstack_sgrow (oout, prologue); -} - /*------------------------------------------------------------------------. @@ -253,13 +230,14 @@ grammar_current_rule_begin (symbol *lhs, location loc) static bool symbol_should_be_used (symbol_list const *s) { - if (symbol_destructor_get (s->content.sym)) + if (symbol_destructor_get (s->content.sym)->code) return true; if (warnings_flag & warnings_midrule_values) - return ((s->midrule && s->midrule->used) + return ((s->midrule && s->midrule->action_props.is_value_used) || (s->midrule_parent_rule && symbol_list_n_get (s->midrule_parent_rule, - s->midrule_parent_rhs_index)->used)); + s->midrule_parent_rhs_index) + ->action_props.is_value_used)); return false; } @@ -278,7 +256,7 @@ grammar_rule_check (const symbol_list *r) Don't worry about the default action if $$ is untyped, since $$'s value can't be used. */ - if (!r->action && r->content.sym->type_name) + if (!r->action_props.code && r->content.sym->type_name) { symbol *first_rhs = r->next->content.sym; /* If $$ is being set in default way, report if any type mismatch. */ @@ -303,10 +281,10 @@ grammar_rule_check (const symbol_list *r) symbol_list const *l = r; int n = 0; for (; l && l->content.sym; l = l->next, ++n) - if (! (l->used + if (! (l->action_props.is_value_used || !symbol_should_be_used (l) /* The default action, $$ = $1, `uses' both. */ - || (!r->action && (n == 0 || n == 1)))) + || (!r->action_props.code && (n == 0 || n == 1)))) { if (n) warn_at (r->location, _("unused value: $%d"), n); @@ -346,7 +324,7 @@ grammar_midrule_action (void) /* Make a DUMMY nonterminal, whose location is that of the midrule action. Create the MIDRULE. */ - location dummy_location = current_rule->action_location; + location dummy_location = current_rule->action_props.location; symbol *dummy = dummy_symbol_get (dummy_location); symbol_list *midrule = symbol_list_sym_new (dummy, dummy_location); @@ -356,12 +334,11 @@ grammar_midrule_action (void) ++nritems; /* Attach its location and actions to that of the DUMMY. */ midrule->location = dummy_location; - midrule->action = current_rule->action; - midrule->action_location = dummy_location; - current_rule->action = NULL; - /* The action has not been translated yet, so $$ use hasn't been - detected yet. */ - midrule->used = false; + code_props_rule_action_init (&midrule->action_props, + current_rule->action_props.code, + current_rule->action_props.location, + midrule); + code_props_none_init (¤t_rule->action_props); if (previous_rule_end) previous_rule_end->next = midrule; @@ -387,6 +364,7 @@ grammar_midrule_action (void) void grammar_current_rule_prec_set (symbol *precsym, location loc) { + symbol_class_set (precsym, token_sym, loc, false); if (current_rule->ruleprec) complain_at (loc, _("only one %s allowed per rule"), "%prec"); current_rule->ruleprec = precsym; @@ -426,7 +404,7 @@ grammar_current_rule_merge_set (uniqstr name, location loc) void grammar_current_rule_symbol_append (symbol *sym, location loc) { - if (current_rule->action) + if (current_rule->action_props.code) grammar_midrule_action (); grammar_symbol_append (sym, loc); } @@ -436,12 +414,12 @@ grammar_current_rule_symbol_append (symbol *sym, location loc) void grammar_current_rule_action_append (const char *action, location loc) { - if (current_rule->action) + if (current_rule->action_props.code) grammar_midrule_action (); /* After all symbol declarations have been parsed, packgram invokes - translate_rule_action. */ - current_rule->action = action; - current_rule->action_location = loc; + code_props_translate_code. */ + code_props_rule_action_init (¤t_rule->action_props, action, loc, + current_rule); } @@ -464,21 +442,6 @@ packgram (void) rules = xnmalloc (nrules, sizeof *rules); - /* Before invoking grammar_rule_check on any rule, make sure all actions have - already been scanned in order to set `used' flags. Otherwise, checking - that a midrule's $$ should be set will not always work properly because - the check must forward-reference the midrule's parent rule. For the same - reason, all the `used' flags must be set before checking whether to remove - `$' from any midrule symbol name. */ - while (p) - { - if (p->action) - p->action = translate_rule_action (p); - if (p) - p = p->next; - } - - p = grammar; while (p) { int rule_length = 0; @@ -495,16 +458,17 @@ packgram (void) rules[ruleno].precsym = NULL; rules[ruleno].location = p->location; rules[ruleno].useful = true; - rules[ruleno].action = p->action; - rules[ruleno].action_location = p->action_location; + rules[ruleno].action = p->action_props.code; + rules[ruleno].action_location = p->action_props.location; /* If the midrule's $$ is set or its $n is used, remove the `$' from the symbol name so that it's a user-defined symbol so that the default %destructor and %printer apply. */ if (p->midrule_parent_rule - && (p->used + && (p->action_props.is_value_used || symbol_list_n_get (p->midrule_parent_rule, - p->midrule_parent_rhs_index)->used)) + p->midrule_parent_rhs_index) + ->action_props.is_value_used)) p->content.sym->tag += 1; /* Don't check the generated rule 0. It has no action, so some rhs @@ -584,10 +548,6 @@ reader (void) undeftoken->class = token_sym; undeftoken->number = ntokens++; - /* Initialize the obstacks. */ - obstack_init (&pre_prologue_obstack); - obstack_init (&post_prologue_obstack); - gram_in = xfopen (grammar_file, "r"); gram__flex_debug = trace_flag & trace_scan; @@ -667,6 +627,23 @@ check_and_convert_grammar (void) token symbols into FDEFINES if requested. */ symbols_pack (); + /* Scan rule actions after invoking symbol_check_alias_consistency (in + symbols_pack above) so that token types are set correctly before the rule + action type checking. + + Before invoking grammar_rule_check (in packgram below) on any rule, make + sure all actions have already been scanned in order to set `used' flags. + Otherwise, checking that a midrule's $$ should be set will not always work + properly because the check must forward-reference the midrule's parent + rule. For the same reason, all the `used' flags must be set before + checking whether to remove `$' from any midrule symbol name (also in + packgram). */ + { + symbol_list *sym; + for (sym = grammar; sym; sym = sym->next) + code_props_translate_code (&sym->action_props); + } + /* Convert the grammar into the format described in gram.h. */ packgram ();