X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/71da68b3662b7169c58f8c5d4c0e89bc3caa31c4..7d6bad195977b0204fc8406cac57cf5a4f1c769b:/src/symtab.c

diff --git a/src/symtab.c b/src/symtab.c
index b30ccaf1..9014acf2 100644
--- a/src/symtab.c
+++ b/src/symtab.c
@@ -1,6 +1,6 @@
 /* Symbol table manager for Bison.
 
-   Copyright (C) 1984, 1989, 2000-2002, 2004-2012 Free Software
+   Copyright (C) 1984, 1989, 2000-2002, 2004-2013 Free Software
    Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
@@ -33,6 +33,7 @@
 `-------------------------------------------------------------------*/
 
 static symbol **symbols_sorted = NULL;
+static symbol **semantic_types_sorted = NULL;
 
 /*------------------------.
 | Distinguished symbols.  |
@@ -45,20 +46,6 @@ symbol *accept = NULL;
 symbol *startsymbol = NULL;
 location startsymbol_location;
 
-/*---------------------------------------.
-| Default %destructor's and %printer's.  |
-`---------------------------------------*/
-
-static code_props default_tagged_code_props[CODE_PROPS_SIZE] =
-  {
-    CODE_PROPS_NONE_INIT,
-    CODE_PROPS_NONE_INIT,
-  };
-static code_props default_tagless_code_props[CODE_PROPS_SIZE] =
-  {
-    CODE_PROPS_NONE_INIT,
-    CODE_PROPS_NONE_INIT,
-  };
 
 /*---------------------------------.
 | Create a new symbol, named TAG.  |
@@ -68,21 +55,23 @@ static symbol *
 symbol_new (uniqstr tag, location loc)
 {
   symbol *res = xmalloc (sizeof *res);
-
   uniqstr_assert (tag);
 
   /* If the tag is not a string (starts with a double quote), check
      that it is valid for Yacc. */
   if (tag[0] != '\"' && tag[0] != '\'' && strchr (tag, '-'))
-    yacc_at (loc, _("POSIX Yacc forbids dashes in symbol names: %s"),
-             tag);
+    complain (&loc, Wyacc,
+              _("POSIX Yacc forbids dashes in symbol names: %s"), tag);
 
   res->tag = tag;
   res->location = loc;
 
   res->type_name = NULL;
-  for (int i = 0; i < CODE_PROPS_SIZE; ++i)
-    code_props_none_init (&res->props[i]);
+  {
+    int i;
+    for (i = 0; i < CODE_PROPS_SIZE; ++i)
+      code_props_none_init (&res->props[i]);
+  }
 
   res->number = NUMBER_UNDEFINED;
   res->prec = 0;
@@ -94,17 +83,13 @@ symbol_new (uniqstr tag, location loc)
   res->status = undeclared;
 
   if (nsyms == SYMBOL_NUMBER_MAXIMUM)
-    fatal (_("too many symbols in input grammar (limit is %d)"),
-           SYMBOL_NUMBER_MAXIMUM);
+    complain (NULL, fatal, _("too many symbols in input grammar (limit is %d)"),
+              SYMBOL_NUMBER_MAXIMUM);
   nsyms++;
   return res;
 }
 
-/*-------------------------------------------------------.
-| Name of the code_props type: %destructor or %printer.  |
-`-------------------------------------------------------*/
-
-static char const *
+char const *
 code_props_type_string (code_props_type kind)
 {
   switch (kind)
@@ -122,14 +107,19 @@ code_props_type_string (code_props_type kind)
 `----------------------------------------*/
 
 static semantic_type *
-semantic_type_new (uniqstr tag)
+semantic_type_new (uniqstr tag, const location *loc)
 {
   semantic_type *res = xmalloc (sizeof *res);
 
   uniqstr_assert (tag);
   res->tag = tag;
-  for (int i = 0; i < CODE_PROPS_SIZE; ++i)
-    code_props_none_init (&res->props[i]);
+  res->location = loc ? *loc : empty_location;
+  res->status = undeclared;
+  {
+    int i;
+    for (i = 0; i < CODE_PROPS_SIZE; ++i)
+      code_props_none_init (&res->props[i]);
+  }
 
   return res;
 }
@@ -148,7 +138,7 @@ semantic_type_new (uniqstr tag)
     fprintf (f, " %s { %s }", #Attr, s->props[Attr].code)
 
 void
-symbol_print (symbol *s, FILE *f)
+symbol_print (symbol const *s, FILE *f)
 {
   if (s)
     {
@@ -208,16 +198,24 @@ static void
 symbol_redeclaration (symbol *s, const char *what, location first,
                       location second)
 {
-  complain_at (second, _("%s redeclaration for %s"), what, s->tag);
-  complain_at (first, _("previous declaration"));
+  unsigned i = 0;
+  complain_indent (&second, complaint, &i,
+                   _("%s redeclaration for %s"), what, s->tag);
+  i += SUB_INDENT;
+  complain_indent (&first, complaint, &i,
+                   _("previous declaration"));
 }
 
 static void
 semantic_type_redeclaration (semantic_type *s, const char *what, location first,
                              location second)
 {
-  complain_at (second, _("%s redeclaration for <%s>"), what, s->tag);
-  complain_at (first, _("previous declaration"));
+  unsigned i = 0;
+  complain_indent (&second, complaint, &i,
+                   _("%s redeclaration for <%s>"), what, s->tag);
+  i += SUB_INDENT;
+  complain_indent (&first, complaint, &i,
+                   _("previous declaration"));
 }
 
 
@@ -275,9 +273,8 @@ semantic_type_code_props_set (semantic_type *type,
 | Get the computed %destructor or %printer for SYM.  |
 `---------------------------------------------------*/
 
-code_props const *
-symbol_code_props_get (symbol const *sym,
-                       code_props_type kind)
+code_props *
+symbol_code_props_get (symbol *sym, code_props_type kind)
 {
   /* Per-symbol code props.  */
   if (sym->props[kind].code)
@@ -286,19 +283,21 @@ symbol_code_props_get (symbol const *sym,
   /* Per-type code props.  */
   if (sym->type_name)
     {
-      code_props const *code =
-        &semantic_type_get (sym->type_name)->props[kind];
+      code_props *code =
+        &semantic_type_get (sym->type_name, NULL)->props[kind];
       if (code->code)
         return code;
     }
 
   /* Apply default code props's only to user-defined symbols.  */
-  if (sym->tag[0] == '$' || sym == errtoken)
-    return &code_props_none;
-
-  if (sym->type_name)
-    return &default_tagged_code_props[kind];
-  return &default_tagless_code_props[kind];
+  if (sym->tag[0] != '$' && sym != errtoken)
+    {
+      code_props *code =
+        &semantic_type_get (sym->type_name ? "*" : "", NULL)->props[kind];
+      if (code->code)
+        return code;
+    }
+  return &code_props_none;
 }
 
 /*-----------------------------------------------------------------.
@@ -334,8 +333,8 @@ symbol_class_set (symbol *sym, symbol_class class, location loc, bool declaring)
   bool warned = false;
   if (sym->class != unknown_sym && sym->class != class)
     {
-      complain_at (loc, _("symbol %s redefined"), sym->tag);
-      // Don't report both "redefined" and "redeclared".
+      complain (&loc, complaint, _("symbol %s redefined"), sym->tag);
+      /* Don't report both "redefined" and "redeclared".  */
       warned = true;
     }
 
@@ -349,7 +348,7 @@ symbol_class_set (symbol *sym, symbol_class class, location loc, bool declaring)
   if (declaring)
     {
       if (sym->status == declared && !warned)
-        warn_at (loc, _("symbol %s redeclared"), sym->tag);
+        complain (&loc, Wother, _("symbol %s redeclared"), sym->tag);
       sym->status = declared;
     }
 }
@@ -370,7 +369,8 @@ symbol_user_token_number_set (symbol *sym, int user_token_number, location loc)
     user_token_numberp = &sym->alias->user_token_number;
   if (*user_token_numberp != USER_NUMBER_UNDEFINED
       && *user_token_numberp != user_token_number)
-    complain_at (loc, _("redefining user token number of %s"), sym->tag);
+    complain (&loc, complaint, _("redefining user token number of %s"),
+              sym->tag);
 
   *user_token_numberp = user_token_number;
   /* User defined $end token? */
@@ -396,30 +396,55 @@ symbol_check_defined (symbol *sym)
 {
   if (sym->class == unknown_sym)
     {
-      switch (sym->status)
-        {
-        case used:
-          warn_at (sym->location,
-                   _("symbol %s is used, but is not defined as a token"
-                     " and has no rules"),
-                   sym->tag);
-          break;
-        case undeclared:
-        case needed:
-          complain_at (sym->location,
-                       _("symbol %s is used, but is not defined as a token"
-                         " and has no rules"),
-                       sym->tag);
-          break;
-        case declared:
-          /* If declared, then sym->class != unknown_sym. */
-          assert (0);
-        }
-
+      assert (sym->status != declared);
+      complain (&sym->location,
+                sym->status == needed ? complaint : Wother,
+                _("symbol %s is used, but is not defined as a token"
+                  " and has no rules"),
+                  sym->tag);
       sym->class = nterm_sym;
       sym->number = nvars++;
     }
 
+  {
+    int i;
+    for (i = 0; i < 2; ++i)
+      symbol_code_props_get (sym, i)->is_used = true;
+  }
+
+  /* Set the semantic type status associated to the current symbol to
+     'declared' so that we could check semantic types unnecessary uses. */
+  if (sym->type_name)
+    {
+      semantic_type *sem_type = semantic_type_get (sym->type_name, NULL);
+      if (sem_type)
+        sem_type->status = declared;
+    }
+
+  return true;
+}
+
+static inline bool
+semantic_type_check_defined (semantic_type *sem_type)
+{
+  /* <*> and <> do not have to be "declared".  */
+  if (sem_type->status == declared
+      || !*sem_type->tag
+      || STREQ(sem_type->tag, "*"))
+    {
+      int i;
+      for (i = 0; i < 2; ++i)
+        if (sem_type->props[i].kind != CODE_PROPS_NONE
+            && ! sem_type->props[i].is_used)
+          complain (&sem_type->location, Wother,
+                    _("useless %s for type <%s>"),
+                    code_props_type_string (i), sem_type->tag);
+    }
+  else
+    complain (&sem_type->location, Wother,
+              _("type <%s> is used, but is not associated to any symbol"),
+              sem_type->tag);
+
   return true;
 }
 
@@ -429,16 +454,23 @@ symbol_check_defined_processor (void *sym, void *null ATTRIBUTE_UNUSED)
   return symbol_check_defined (sym);
 }
 
+static bool
+semantic_type_check_defined_processor (void *sem_type,
+                                       void *null ATTRIBUTE_UNUSED)
+{
+  return semantic_type_check_defined (sem_type);
+}
+
 
 void
 symbol_make_alias (symbol *sym, symbol *str, location loc)
 {
   if (str->alias)
-    warn_at (loc, _("symbol %s used more than once as a literal string"),
-             str->tag);
+    complain (&loc, Wother,
+              _("symbol %s used more than once as a literal string"), str->tag);
   else if (sym->alias)
-    warn_at (loc, _("symbol %s given more than one literal string"),
-             sym->tag);
+    complain (&loc, Wother,
+              _("symbol %s given more than one literal string"), sym->tag);
   else
     {
       str->class = token_sym;
@@ -477,11 +509,14 @@ symbol_check_alias_consistency (symbol *this)
     }
 
 
-  for (int i = 0; i < CODE_PROPS_SIZE; ++i)
-    if (str->props[i].code)
-      symbol_code_props_set (sym, i, &str->props[i]);
-    else if (sym->props[i].code)
-      symbol_code_props_set (str, i, &sym->props[i]);
+  {
+    int i;
+    for (i = 0; i < CODE_PROPS_SIZE; ++i)
+      if (str->props[i].code)
+        symbol_code_props_set (sym, i, &str->props[i]);
+      else if (sym->props[i].code)
+        symbol_code_props_set (str, i, &sym->props[i]);
+  }
 
   if (sym->prec || str->prec)
     {
@@ -531,6 +566,7 @@ symbol_pack_processor (void *this, void *null ATTRIBUTE_UNUSED)
 static void
 user_token_number_redeclaration (int num, symbol *first, symbol *second)
 {
+  unsigned i = 0;
   /* User token numbers are not assigned during the parsing, but in a
      second step, via a traversal of the symbol table sorted on tag.
 
@@ -542,11 +578,13 @@ user_token_number_redeclaration (int num, symbol *first, symbol *second)
       first = second;
       second = tmp;
     }
-  complain_at (second->location,
-               _("user token number %d redeclaration for %s"),
-               num, second->tag);
-  complain_at (first->location, _("previous declaration for %s"),
-               first->tag);
+  complain_indent (&second->location, complaint, &i,
+                   _("user token number %d redeclaration for %s"),
+                   num, second->tag);
+  i += SUB_INDENT;
+  complain_indent (&first->location, complaint, &i,
+                   _("previous declaration for %s"),
+                   first->tag);
 }
 
 /*--------------------------------------------------.
@@ -694,7 +732,7 @@ symbol_from_uniqstr (const uniqstr key, location loc)
 `-----------------------------------------------------------------------*/
 
 semantic_type *
-semantic_type_from_uniqstr (const uniqstr key)
+semantic_type_from_uniqstr (const uniqstr key, const location *loc)
 {
   semantic_type probe;
   semantic_type *entry;
@@ -705,7 +743,7 @@ semantic_type_from_uniqstr (const uniqstr key)
   if (!entry)
     {
       /* First insertion in the hash. */
-      entry = semantic_type_new (key);
+      entry = semantic_type_new (key, loc);
       if (!hash_insert (semantic_type_table, entry))
         xalloc_die ();
     }
@@ -731,9 +769,9 @@ symbol_get (const char *key, location loc)
 `-----------------------------------------------------------------------*/
 
 semantic_type *
-semantic_type_get (const char *key)
+semantic_type_get (const char *key, const location *loc)
 {
-  return semantic_type_from_uniqstr (uniqstr_new (key));
+  return semantic_type_from_uniqstr (uniqstr_new (key), loc);
 }
 
 
@@ -775,6 +813,7 @@ symbols_free (void)
   hash_free (semantic_type_table);
   free (symbols);
   free (symbols_sorted);
+  free (semantic_types_sorted);
 }
 
 
@@ -797,19 +836,19 @@ symbols_cmp_qsort (void const *a, void const *b)
 
 static void
 symbols_do (Hash_processor processor, void *processor_data,
-            struct hash_table *table, symbol **sorted)
+            struct hash_table *table, symbol ***sorted)
 {
   size_t count = hash_get_n_entries (table);
-  if (!sorted)
+  if (!*sorted)
     {
-      sorted = xnmalloc (count, sizeof *sorted);
-      hash_get_entries (table, (void**)sorted, count);
-      qsort (sorted, count, sizeof *sorted, symbols_cmp_qsort);
+      *sorted = xnmalloc (count, sizeof **sorted);
+      hash_get_entries (table, (void**)*sorted, count);
+      qsort (*sorted, count, sizeof **sorted, symbols_cmp_qsort);
     }
   {
     size_t i;
     for (i = 0; i < count; ++i)
-      processor (sorted[i], processor_data);
+      processor ((*sorted)[i], processor_data);
   }
 }
 
@@ -822,7 +861,9 @@ void
 symbols_check_defined (void)
 {
   symbols_do (symbol_check_defined_processor, NULL,
-              symbol_table, symbols_sorted);
+              symbol_table, &symbols_sorted);
+  symbols_do (semantic_type_check_defined_processor, NULL,
+              semantic_type_table, &semantic_types_sorted);
 }
 
 /*------------------------------------------------------------------.
@@ -877,7 +918,7 @@ symbols_token_translations_init (void)
   for (i = 0; i < max_user_token_number + 1; i++)
     token_translations[i] = undeftoken->number;
   symbols_do (symbol_translation_processor, NULL,
-              symbol_table, symbols_sorted);
+              symbol_table, &symbols_sorted);
 }
 
 
@@ -890,10 +931,10 @@ void
 symbols_pack (void)
 {
   symbols_do (symbol_check_alias_consistency_processor, NULL,
-              symbol_table, symbols_sorted);
+              symbol_table, &symbols_sorted);
 
   symbols = xcalloc (nsyms, sizeof *symbols);
-  symbols_do (symbol_pack_processor, NULL, symbol_table, symbols_sorted);
+  symbols_do (symbol_pack_processor, NULL, symbol_table, &symbols_sorted);
 
   /* Aliases leave empty slots in symbols, so remove them.  */
   {
@@ -922,45 +963,11 @@ symbols_pack (void)
   symbols_token_translations_init ();
 
   if (startsymbol->class == unknown_sym)
-    fatal_at (startsymbol_location,
+    complain (&startsymbol_location, fatal,
               _("the start symbol %s is undefined"),
               startsymbol->tag);
   else if (startsymbol->class == token_sym)
-    fatal_at (startsymbol_location,
+    complain (&startsymbol_location, fatal,
               _("the start symbol %s is a token"),
               startsymbol->tag);
 }
-
-
-/*--------------------------------------------------.
-| Set default tagged/tagless %destructor/%printer.  |
-`--------------------------------------------------*/
-
-void
-default_tagged_code_props_set (code_props_type kind, code_props const *code)
-{
-  if (default_tagged_code_props[kind].code)
-    {
-      complain_at (code->location,
-                   _("redeclaration for default tagged %s"),
-                   code_props_type_string (kind));
-      complain_at (default_tagged_code_props[kind].location,
-                   _("previous declaration"));
-    }
-  default_tagged_code_props[kind] = *code;
-}
-
-void
-default_tagless_code_props_set (code_props_type kind, code_props const *code)
-{
-  if (default_tagless_code_props[kind].code)
-    {
-      complain_at (code->location,
-                   _("redeclaration for default tagless %s"),
-                   code_props_type_string (kind));
-      complain_at (default_tagless_code_props[kind].location,
-                   _("previous declaration"));
-    }
-  default_tagless_code_props[kind] = *code;
-}
-