+code_props const *
+symbol_destructor_get (symbol const *sym)
+{
+ /* Per-symbol %destructor. */
+ if (sym->destructor.code)
+ return &sym->destructor;
+
+ /* Per-type %destructor. */
+ if (sym->type_name)
+ {
+ code_props const *destructor =
+ &semantic_type_get (sym->type_name)->destructor;
+ if (destructor->code)
+ return destructor;
+ }
+
+ /* Apply default %destructor's only to user-defined symbols. */
+ if (sym->tag[0] == '$' || sym == errtoken)
+ return &code_props_none;
+
+ if (sym->type_name)
+ return &default_tagged_destructor;
+ return &default_tagless_destructor;
+}
+
+/*--------------------------------------.
+| Set the PRINTER associated with SYM. |
+`--------------------------------------*/
+
+void
+symbol_printer_set (symbol *sym, code_props const *printer)
+{
+ if (sym->printer.code)
+ symbol_redeclaration (sym, "%printer",
+ sym->printer.location, printer->location);
+ sym->printer = *printer;
+}
+
+/*---------------------------------------.
+| Set the PRINTER associated with TYPE. |
+`---------------------------------------*/
+
+void
+semantic_type_printer_set (semantic_type *type, code_props const *printer)
+{
+ if (type->printer.code)
+ semantic_type_redeclaration (type, "%printer",
+ type->printer.location, printer->location);
+ type->printer = *printer;
+}
+
+/*------------------------------------.
+| Get the computed %printer for SYM. |
+`------------------------------------*/
+
+code_props const *
+symbol_printer_get (symbol const *sym)
+{
+ /* Per-symbol %printer. */
+ if (sym->printer.code)
+ return &sym->printer;
+
+ /* Per-type %printer. */
+ if (sym->type_name)
+ {
+ code_props const *printer = &semantic_type_get (sym->type_name)->printer;
+ if (printer->code)
+ return printer;
+ }
+
+ /* Apply the default %printer only to user-defined symbols. */
+ if (sym->tag[0] == '$' || sym == errtoken)
+ return &code_props_none;
+
+ if (sym->type_name)
+ return &default_tagged_printer;
+ return &default_tagless_printer;
+}
+
+/*-----------------------------------------------------------------.
+| Set the PRECEDENCE associated with SYM. Does nothing if invoked |
+| with UNDEF_ASSOC as ASSOC. |
+`-----------------------------------------------------------------*/
+
+void
+symbol_precedence_set (symbol *sym, int prec, assoc a, location loc)
+{
+ if (a != undef_assoc)
+ {
+ if (sym->prec != 0)
+ symbol_redeclaration (sym, assoc_to_string (a), sym->prec_location,
+ loc);
+ sym->prec = prec;
+ sym->assoc = a;
+ sym->prec_location = loc;
+ }
+
+ /* Only terminals have a precedence. */
+ symbol_class_set (sym, token_sym, loc, false);
+}
+
+
+/*------------------------------------.
+| Set the CLASS associated with SYM. |
+`------------------------------------*/
+
+void
+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);
+ sym->declared = false;
+ }
+
+ if (class == nterm_sym && sym->class != nterm_sym)
+ sym->number = nvars++;
+ else if (class == token_sym && sym->number == NUMBER_UNDEFINED)
+ sym->number = ntokens++;
+
+ sym->class = class;
+
+ if (declaring)
+ {
+ if (sym->declared)
+ warn_at (loc, _("symbol %s redeclared"), sym->tag);
+ sym->declared = true;
+ }
+}
+
+
+/*------------------------------------------------.
+| Set the USER_TOKEN_NUMBER associated with SYM. |
+`------------------------------------------------*/
+
+void
+symbol_user_token_number_set (symbol *sym, int user_token_number, location loc)
+{
+ int *user_token_numberp;
+
+ if (sym->user_token_number != USER_NUMBER_ALIAS)
+ user_token_numberp = &sym->user_token_number;
+ else
+ 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);
+
+ *user_token_numberp = user_token_number;
+ /* User defined $end token? */
+ if (user_token_number == 0)
+ {
+ endtoken = sym;
+ endtoken->number = 0;
+ /* It is always mapped to 0, so it was already counted in
+ NTOKENS. */
+ --ntokens;
+ }
+}
+
+
+/*----------------------------------------------------------.
+| If SYM is not defined, report an error, and consider it a |
+| nonterminal. |
+`----------------------------------------------------------*/
+
+static inline bool
+symbol_check_defined (symbol *sym)
+{
+ if (sym->class == unknown_sym)
+ {
+ complain_at
+ (sym->location,
+ _("symbol %s is used, but is not defined as a token and has no rules"),
+ sym->tag);
+ sym->class = nterm_sym;
+ sym->number = nvars++;
+ }
+
+ return true;
+}
+
+static bool
+symbol_check_defined_processor (void *sym, void *null ATTRIBUTE_UNUSED)
+{
+ return symbol_check_defined (sym);
+}
+
+
+/*------------------------------------------------------------------.
+| Declare the new symbol SYM. Make it an alias of SYMVAL, and type |
+| SYMVAL with SYM's type. |
+`------------------------------------------------------------------*/
projects / bison.git / blobdiff