/* Symbol table manager for Bison.
- Copyright (C) 1984, 1989, 2000, 2001, 2002, 2004, 2005 Free Software
- Foundation, Inc.
+ Copyright (C) 1984, 1989, 2000, 2001, 2002, 2004, 2005, 2006 Free
+ Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
symbol *startsymbol = NULL;
location startsymbol_location;
+/*-----------------------------------.
+| Default %destructor and %printer. |
+`-----------------------------------*/
+
+static const char *default_destructor = NULL;
+static location default_destructor_location;
+static const char *default_printer = NULL;
+static location default_printer_location;
+
/*---------------------------------.
| Create a new symbol, named TAG. |
`---------------------------------*/
res->alias = NULL;
res->class = unknown_sym;
+ res->declared = false;
if (nsyms == SYMBOL_NUMBER_MAXIMUM)
fatal (_("too many symbols in input grammar (limit is %d)"),
void
symbol_print (symbol *s, FILE *f)
{
- fprintf (f, "\"%s\"", s->tag);
- SYMBOL_ATTR_PRINT (type_name);
- SYMBOL_ATTR_PRINT (destructor);
- SYMBOL_ATTR_PRINT (printer);
+ if (s)
+ {
+ fprintf (f, "\"%s\"", s->tag);
+ SYMBOL_ATTR_PRINT (type_name);
+ SYMBOL_ATTR_PRINT (destructor);
+ SYMBOL_ATTR_PRINT (printer);
+ }
+ else
+ fprintf (f, "<NULL>");
}
#undef SYMBOL_ATTR_PRINT
redeclaration (symbol* s, const char *what, location first, location second)
{
complain_at (second, _("%s redeclaration for %s"), what, s->tag);
- complain_at (first, _("first declaration"));
+ complain_at (first, _("previous declaration"));
}
}
}
+/*---------------------------------------.
+| Get the computed %destructor for SYM. |
+`---------------------------------------*/
+
+const char *
+symbol_destructor_get (symbol *sym)
+{
+ /* Token 0 cannot have a %destructor unless the user renames it. */
+ if (UNIQSTR_EQ (sym->tag, uniqstr_new ("$end")))
+ return NULL;
+
+ if (sym->destructor != NULL)
+ return sym->destructor;
+ return default_destructor;
+}
+
+/*---------------------------------------------------------------.
+| Get the grammar location of the %destructor computed for SYM. |
+`---------------------------------------------------------------*/
+
+location
+symbol_destructor_location_get (symbol *sym)
+{
+ if (sym->destructor != NULL)
+ return sym->destructor_location;
+ return default_destructor_location;
+}
/*---------------------------------------------------------------.
| Set the PRINTER associated with SYM. Do nothing if passed 0. |
if (printer)
{
if (sym->printer)
- redeclaration (sym, "%printer", sym->destructor_location, loc);
+ redeclaration (sym, "%printer", sym->printer_location, loc);
sym->printer = printer;
sym->printer_location = loc;
}
}
+/*------------------------------------.
+| Get the computed %printer for SYM. |
+`------------------------------------*/
+
+const char *
+symbol_printer_get (symbol *sym)
+{
+ /* Token 0 cannot have a %printer unless the user renames it. */
+ if (UNIQSTR_EQ (sym->tag, uniqstr_new ("$end")))
+ return NULL;
+
+ if (sym->printer != NULL)
+ return sym->printer;
+ return default_printer;
+}
+
+/*------------------------------------------------------------.
+| Get the grammar location of the %printer computed for SYM. |
+`------------------------------------------------------------*/
+
+location
+symbol_printer_location_get (symbol *sym)
+{
+ if (sym->printer != NULL)
+ return sym->printer_location;
+ return default_printer_location;
+}
+
/*-----------------------------------------------------------------.
| Set the PRECEDENCE associated with SYM. Does nothing if invoked |
}
/* Only terminals have a precedence. */
- symbol_class_set (sym, token_sym, loc);
+ symbol_class_set (sym, token_sym, loc, false);
}
`------------------------------------*/
void
-symbol_class_set (symbol *sym, symbol_class class, location loc)
+symbol_class_set (symbol *sym, symbol_class class, location loc, bool declaring)
{
if (sym->class != unknown_sym && sym->class != class)
- complain_at (loc, _("symbol %s redefined"), sym->tag);
+ {
+ complain_at (loc, _("symbol %s redefined"), sym->tag);
+ sym->declared = false;
+ }
if (class == nterm_sym && sym->class != nterm_sym)
sym->number = nvars++;
sym->number = ntokens++;
sym->class = class;
+
+ if (declaring)
+ {
+ if (sym->declared)
+ warn_at (loc, _("symbol %s redeclared"), sym->tag);
+ sym->declared = true;
+ }
}
void
symbol_user_token_number_set (symbol *sym, int user_token_number, location loc)
{
- if (sym->class != token_sym)
- abort ();
+ assert (sym->class == token_sym);
if (sym->user_token_number != USER_NUMBER_UNDEFINED
&& sym->user_token_number != user_token_number)
/* sym and symval combined are only one symbol. */
nsyms--;
ntokens--;
- if (ntokens != sym->number && ntokens != symval->number)
- abort ();
+ assert (ntokens == sym->number || ntokens == symval->number);
sym->number = symval->number =
(symval->number < sym->number) ? symval->number : sym->number;
symbol_type_set (symval, sym->type_name, loc);
this->number = this->alias->number = 0;
else
{
- if (this->alias->number == NUMBER_UNDEFINED)
- abort ();
+ assert (this->alias->number != NUMBER_UNDEFINED);
this->number = this->alias->number;
}
}
return true;
}
else /* this->class == token_sym */
- {
- if (this->number == NUMBER_UNDEFINED)
- abort ();
- }
+ assert (this->number != NUMBER_UNDEFINED);
symbols[this->number] = this;
return true;
`----------------------------------------------------------------*/
symbol *
-symbol_get (const char *key, location loc)
+symbol_from_uniqstr (const uniqstr key, location loc)
{
symbol probe;
symbol *entry;
- key = uniqstr_new (key);
probe.tag = key;
entry = hash_lookup (symbol_table, &probe);
}
+/*----------------------------------------------------------------.
+| Find the symbol named KEY, and return it. If it does not exist |
+| yet, create it. |
+`----------------------------------------------------------------*/
+
+symbol *
+symbol_get (const char *key, location loc)
+{
+ return symbol_from_uniqstr (uniqstr_new (key), loc);
+}
+
+
/*------------------------------------------------------------------.
| Generate a dummy nonterminal, whose name cannot conflict with the |
| user's names. |
_("the start symbol %s is a token"),
startsymbol->tag);
}
+
+
+/*-----------------------------------.
+| Set default %destructor/%printer. |
+`-----------------------------------*/
+
+void
+default_destructor_set (const char *destructor, location loc)
+{
+ if (default_destructor != NULL)
+ {
+ complain_at (loc, _("redeclaration for default %%destructor"));
+ complain_at (default_destructor_location, _("previous declaration"));
+ }
+ default_destructor = destructor;
+ default_destructor_location = loc;
+}
+
+void
+default_printer_set (const char *printer, location loc)
+{
+ if (default_printer != NULL)
+ {
+ complain_at (loc, _("redeclaration for default %%printer"));
+ complain_at (default_printer_location, _("previous declaration"));
+ }
+ default_printer = printer;
+ default_printer_location = loc;
+}
projects / bison.git / blobdiff