* GNUmakefile: Update git-version-gen invocation so make dist

[bison.git] / src / reader.c

diff --git a/src/reader.c b/src/reader.c
index 800ecc227876b0b060551ca804c3152a67e13c55..7758c772937fd126966ecc13bdf500b21c88de9d 100644 (file)
--- a/src/reader.c
+++ b/src/reader.c
@@ -1,28 +1,25 @@
 /* Input parser for Bison
 
    Copyright (C) 1984, 1986, 1989, 1992, 1998, 2000, 2001, 2002, 2003,
 /* 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.
 
 
    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
    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
    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 <http://www.gnu.org/licenses/>.  */

 
 #include <config.h>
 #include "system.h"
 
 #include <config.h>
 #include "system.h"

-#include <assert.h>

 
 #include <quotearg.h>
 
 
 #include <quotearg.h>
 


@@ -70,27 +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);
-}
-

 \f
 
 /*------------------------------------------------------------------------.
 \f
 
 /*------------------------------------------------------------------------.


@@ -148,7 +124,7 @@ record_merge_function_type (int merger, uniqstr type, location declaration_loc)
        merge_function != NULL && merger_find != merger;
        merge_function = merge_function->next)
     merger_find += 1;
        merge_function != NULL && merger_find != merger;
        merge_function = merge_function->next)
     merger_find += 1;

-  assert (merge_function != NULL && merger_find == merger);
+  aver (merge_function != NULL && merger_find == merger);

   if (merge_function->type != NULL && !UNIQSTR_EQ (merge_function->type, type))
     {
       complain_at (declaration_loc,
   if (merge_function->type != NULL && !UNIQSTR_EQ (merge_function->type, type))
     {
       complain_at (declaration_loc,


@@ -196,7 +172,7 @@ static symbol_list *grammar_end = NULL;
 static void
 grammar_symbol_append (symbol *sym, location loc)
 {
 static void
 grammar_symbol_append (symbol *sym, location loc)
 {

-  symbol_list *p = symbol_list_new (sym, loc);
+  symbol_list *p = symbol_list_sym_new (sym, loc);

 
   if (grammar_end)
     grammar_end->next = p;
 
   if (grammar_end)
     grammar_end->next = p;


@@ -225,13 +201,6 @@ static symbol_list *previous_rule_end = NULL;
 void
 grammar_current_rule_begin (symbol *lhs, location loc)
 {
 void
 grammar_current_rule_begin (symbol *lhs, location loc)
 {

-  if (!start_flag)
-    {
-      startsymbol = lhs;
-      startsymbol_location = loc;
-      start_flag = true;
-    }
-

   /* Start a new rule and record its lhs.  */
   ++nrules;
   previous_rule_end = grammar_end;
   /* Start a new rule and record its lhs.  */
   ++nrules;
   previous_rule_end = grammar_end;


@@ -251,16 +220,25 @@ grammar_current_rule_begin (symbol *lhs, location loc)
 
 
 /*----------------------------------------------------------------------.
 
 
 /*----------------------------------------------------------------------.

-| A symbol should be used if it has a destructor, or if it is a         |
-| mid-rule symbol (i.e., the generated LHS replacing a mid-rule         |
-| action) that was assigned to, as in "exp: { $$ = 1; } { $$ = $1; }".  |
+| A symbol should be used if either:                                    |
+|   1. It has a destructor.                                             |
+|   2. --warnings=midrule-values and the symbol is a mid-rule symbol    |
+|      (i.e., the generated LHS replacing a mid-rule action) that was   |
+|      assigned to or used, as in "exp: { $$ = 1; } { $$ = $1; }".      |

 `----------------------------------------------------------------------*/
 
 static bool
 symbol_should_be_used (symbol_list const *s)
 {
 `----------------------------------------------------------------------*/
 
 static bool
 symbol_should_be_used (symbol_list const *s)
 {

-  return (s->sym->destructor
-         || (s->midrule && s->midrule->used));
+  if (symbol_destructor_get (s->content.sym)->code)
+    return true;
+  if (warnings_flag & warnings_midrule_values)
+    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)
+                     ->action_props.is_value_used));
+  return false;

 }
 
 /*----------------------------------------------------------------.
 }
 
 /*----------------------------------------------------------------.


@@ -278,13 +256,13 @@ grammar_rule_check (const symbol_list *r)
 
      Don't worry about the default action if $$ is untyped, since $$'s
      value can't be used.  */
 
      Don't worry about the default action if $$ is untyped, since $$'s
      value can't be used.  */

-  if (!r->action && r->sym->type_name)
+  if (!r->action_props.code && r->content.sym->type_name)

     {
     {

-      symbol *first_rhs = r->next->sym;
+      symbol *first_rhs = r->next->content.sym;

       /* If $$ is being set in default way, report if any type mismatch.  */
       if (first_rhs)
        {
       /* If $$ is being set in default way, report if any type mismatch.  */
       if (first_rhs)
        {

-         char const *lhs_type = r->sym->type_name;
+         char const *lhs_type = r->content.sym->type_name;

          const char *rhs_type =
            first_rhs->type_name ? first_rhs->type_name : "";
          if (!UNIQSTR_EQ (lhs_type, rhs_type))
          const char *rhs_type =
            first_rhs->type_name ? first_rhs->type_name : "";
          if (!UNIQSTR_EQ (lhs_type, rhs_type))


@@ -302,11 +280,11 @@ grammar_rule_check (const symbol_list *r)
   {
     symbol_list const *l = r;
     int n = 0;
   {
     symbol_list const *l = r;
     int n = 0;

-    for (; l && l->sym; l = l->next, ++n)
-      if (! (l->used
+    for (; l && l->content.sym; l = l->next, ++n)
+      if (! (l->action_props.is_value_used

             || !symbol_should_be_used (l)
             /* The default action, $$ = $1, `uses' both.  */
             || !symbol_should_be_used (l)
             /* The default action, $$ = $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);
        {
          if (n)
            warn_at (r->location, _("unused value: $%d"), n);


@@ -346,9 +324,9 @@ grammar_midrule_action (void)
 
   /* Make a DUMMY nonterminal, whose location is that of the midrule
      action.  Create the MIDRULE.  */
 
   /* 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 *dummy = dummy_symbol_get (dummy_location);

-  symbol_list *midrule = symbol_list_new (dummy, dummy_location);
+  symbol_list *midrule = symbol_list_sym_new (dummy, dummy_location);

 
   /* Make a new rule, whose body is empty, before the current one, so
      that the action just read can belong to it.  */
 
   /* Make a new rule, whose body is empty, before the current one, so
      that the action just read can belong to it.  */


@@ -356,12 +334,11 @@ grammar_midrule_action (void)
   ++nritems;
   /* Attach its location and actions to that of the DUMMY.  */
   midrule->location = dummy_location;
   ++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 (&current_rule->action_props);

 
   if (previous_rule_end)
     previous_rule_end->next = midrule;
 
   if (previous_rule_end)
     previous_rule_end->next = midrule;


@@ -369,7 +346,7 @@ grammar_midrule_action (void)
     grammar = midrule;
 
   /* End the dummy's rule.  */
     grammar = midrule;
 
   /* End the dummy's rule.  */

-  midrule->next = symbol_list_new (NULL, dummy_location);
+  midrule->next = symbol_list_sym_new (NULL, dummy_location);

   midrule->next->next = current_rule;
 
   previous_rule_end = midrule->next;
   midrule->next->next = current_rule;
 
   previous_rule_end = midrule->next;


@@ -387,6 +364,7 @@ grammar_midrule_action (void)
 void
 grammar_current_rule_prec_set (symbol *precsym, location loc)
 {
 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;
   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)
 {
 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);
 }
     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)
 {
 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
     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 (&current_rule->action_props, action, loc,
+                               current_rule);

 }
 
 \f
 }
 
 \f


@@ -468,11 +446,11 @@ packgram (void)
     {
       int rule_length = 0;
       symbol *ruleprec = p->ruleprec;
     {
       int rule_length = 0;
       symbol *ruleprec = p->ruleprec;

-      record_merge_function_type (p->merger, p->sym->type_name,
+      record_merge_function_type (p->merger, p->content.sym->type_name,

                                  p->merger_declaration_location);
       rules[ruleno].user_number = ruleno;
       rules[ruleno].number = ruleno;
                                  p->merger_declaration_location);
       rules[ruleno].user_number = ruleno;
       rules[ruleno].number = ruleno;

-      rules[ruleno].lhs = p->sym;
+      rules[ruleno].lhs = p->content.sym;

       rules[ruleno].rhs = ritem + itemno;
       rules[ruleno].prec = NULL;
       rules[ruleno].dprec = p->dprec;
       rules[ruleno].rhs = ritem + itemno;
       rules[ruleno].prec = NULL;
       rules[ruleno].dprec = p->dprec;


@@ -480,17 +458,26 @@ packgram (void)
       rules[ruleno].precsym = NULL;
       rules[ruleno].location = p->location;
       rules[ruleno].useful = true;
       rules[ruleno].precsym = NULL;
       rules[ruleno].location = p->location;
       rules[ruleno].useful = true;

-      rules[ruleno].action = p->action ? translate_rule_action (p) : NULL;
-      rules[ruleno].action_location = p->action_location;
-
-      /* If this rule contains midrules, rest assured that
-        grammar_midrule_action inserted the midrules into grammar before this
-        rule.  Thus, the midrule actions have already been scanned in order to
-        set `used' flags for this rule's rhs, so grammar_rule_check will work
-        properly.  */
-      grammar_rule_check (p);
-
-      for (p = p->next; p && p->sym; p = p->next)
+      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->action_props.is_value_used
+             || symbol_list_n_get (p->midrule_parent_rule,
+                                   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
+        symbols may appear unused, but the parsing algorithm ensures that
+        %destructor's are invoked appropriately.  */
+      if (p != grammar)
+       grammar_rule_check (p);
+
+      for (p = p->next; p && p->content.sym; p = p->next)

        {
          ++rule_length;
 
        {
          ++rule_length;
 


@@ -501,11 +488,12 @@ packgram (void)
 
          /* item_number = symbol_number.
             But the former needs to contain more: negative rule numbers. */
 
          /* item_number = symbol_number.
             But the former needs to contain more: negative rule numbers. */

-         ritem[itemno++] = symbol_number_as_item_number (p->sym->number);
+         ritem[itemno++] =
+            symbol_number_as_item_number (p->content.sym->number);

          /* A rule gets by default the precedence and associativity
             of its last token.  */
          /* A rule gets by default the precedence and associativity
             of its last token.  */

-         if (p->sym->class == token_sym && default_prec)
-           rules[ruleno].prec = p->sym;
+         if (p->content.sym->class == token_sym && default_prec)
+           rules[ruleno].prec = p->content.sym;

        }
 
       /* If this rule has a %prec,
        }
 
       /* If this rule has a %prec,


@@ -517,15 +505,15 @@ packgram (void)
        }
       /* An item ends by the rule number (negated).  */
       ritem[itemno++] = rule_number_as_item_number (ruleno);
        }
       /* An item ends by the rule number (negated).  */
       ritem[itemno++] = rule_number_as_item_number (ruleno);

-      assert (itemno < ITEM_NUMBER_MAX);
+      aver (itemno < ITEM_NUMBER_MAX);

       ++ruleno;
       ++ruleno;

-      assert (ruleno < RULE_NUMBER_MAX);
+      aver (ruleno < RULE_NUMBER_MAX);

 
       if (p)
        p = p->next;
     }
 
 
       if (p)
        p = p->next;
     }
 

-  assert (itemno == nritems);
+  aver (itemno == nritems);

 
   if (trace_flag & trace_sets)
     ritem_print (stderr);
 
   if (trace_flag & trace_sets)
     ritem_print (stderr);


@@ -560,10 +548,6 @@ reader (void)
   undeftoken->class = token_sym;
   undeftoken->number = ntokens++;
 
   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;
   gram_in = xfopen (grammar_file, "r");
 
   gram__flex_debug = trace_flag & trace_scan;


@@ -603,31 +587,66 @@ check_and_convert_grammar (void)
       endtoken->user_token_number = 0;
     }
 
       endtoken->user_token_number = 0;
     }
 

+  /* Find the start symbol if no %start.  */
+  if (!start_flag)
+    {
+      symbol_list *node;
+      for (node = grammar;
+           node != NULL && symbol_is_dummy (node->content.sym);
+           node = node->next)
+        {
+          for (node = node->next;
+               node != NULL && node->content.sym != NULL;
+               node = node->next)
+            ;
+        }
+      aver (node != NULL);
+      grammar_start_symbol_set (node->content.sym,
+                                node->content.sym->location);
+    }
+

   /* Insert the initial rule, whose line is that of the first rule
      (not that of the start symbol):
 
      accept: %start EOF.  */
   {
   /* Insert the initial rule, whose line is that of the first rule
      (not that of the start symbol):
 
      accept: %start EOF.  */
   {

-    symbol_list *p = symbol_list_new (accept, empty_location);
+    symbol_list *p = symbol_list_sym_new (accept, empty_location);

     p->location = grammar->location;
     p->location = grammar->location;

-    p->next = symbol_list_new (startsymbol, empty_location);
-    p->next->next = symbol_list_new (endtoken, empty_location);
-    p->next->next->next = symbol_list_new (NULL, empty_location);
+    p->next = symbol_list_sym_new (startsymbol, empty_location);
+    p->next->next = symbol_list_sym_new (endtoken, empty_location);
+    p->next->next->next = symbol_list_sym_new (NULL, empty_location);

     p->next->next->next->next = grammar;
     nrules += 1;
     nritems += 3;
     grammar = p;
   }
 
     p->next->next->next->next = grammar;
     nrules += 1;
     nritems += 3;
     grammar = p;
   }
 

-  assert (nsyms <= SYMBOL_NUMBER_MAXIMUM && nsyms == ntokens + nvars);
+  aver (nsyms <= SYMBOL_NUMBER_MAXIMUM && nsyms == ntokens + nvars);

 
   /* Assign the symbols their symbol numbers.  Write #defines for the
      token symbols into FDEFINES if requested.  */
   symbols_pack ();
 
 
   /* Assign the symbols their symbol numbers.  Write #defines for the
      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 ();
 
   /* The grammar as a symbol_list is no longer needed. */
   /* Convert the grammar into the format described in gram.h.  */
   packgram ();
 
   /* The grammar as a symbol_list is no longer needed. */

-  LIST_FREE (symbol_list, grammar);
+  symbol_list_free (grammar);

 }
 }