+symbol_print (symbol *s, FILE *f)
+{
+ if (s)
+ {
+ fprintf (f, "\"%s\"", s->tag);
+ SYMBOL_ATTR_PRINT (type_name);
+ SYMBOL_CODE_PRINT (destructor);
+ SYMBOL_CODE_PRINT (printer);
+ }
+ else
+ fprintf (f, "<NULL>");
+}
+
+#undef SYMBOL_ATTR_PRINT
+#undef SYMBOL_CODE_PRINT
+
+/*------------------------------------------------------------------.
+| Complain that S's WHAT is redeclared at SECOND, and was first set |
+| at FIRST. |
+`------------------------------------------------------------------*/
+
+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"));
+}
+
+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"));
+}
+
+
+
+/*-----------------------------------------------------------------.
+| Set the TYPE_NAME associated with SYM. Does nothing if passed 0 |
+| as TYPE_NAME. |
+`-----------------------------------------------------------------*/
+
+void
+symbol_type_set (symbol *sym, uniqstr type_name, location loc)
+{
+ if (type_name)
+ {
+ if (sym->type_name)
+ symbol_redeclaration (sym, "%type", sym->type_location, loc);
+ uniqstr_assert (type_name);
+ sym->type_name = type_name;
+ sym->type_location = loc;
+ }
+}
+
+/*-----------------------------------------.
+| Set the DESTRUCTOR associated with SYM. |
+`-----------------------------------------*/
+
+void
+symbol_destructor_set (symbol *sym, code_props const *destructor)
+{
+ if (sym->destructor.code)
+ symbol_redeclaration (sym, "%destructor", sym->destructor.location,
+ destructor->location);
+ sym->destructor = *destructor;
+}
+
+/*------------------------------------------.
+| Set the DESTRUCTOR associated with TYPE. |
+`------------------------------------------*/
+
+void
+semantic_type_destructor_set (semantic_type *type,
+ code_props const *destructor)
+{
+ if (type->destructor.code)
+ semantic_type_redeclaration (type, "%destructor",
+ type->destructor.location,
+ destructor->location);
+ type->destructor = *destructor;
+}
+
+/*---------------------------------------.
+| Get the computed %destructor for SYM. |
+`---------------------------------------*/
+
+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_HAS_STRING_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;
+ /* It is always mapped to 0, so it was already counted in
+ NTOKENS. */
+ if (endtoken->number != NUMBER_UNDEFINED)
+ --ntokens;
+ endtoken->number = 0;
+ }
+}
+
+
+/*----------------------------------------------------------.
+| 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);
+}
+
+
+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);
+ else if (sym->alias)
+ warn_at (loc, _("symbol `%s' given more than one literal string"),
+ sym->tag);
+ else
+ {
+ str->class = token_sym;
+ str->user_token_number = sym->user_token_number;
+ sym->user_token_number = USER_NUMBER_HAS_STRING_ALIAS;
+ str->alias = sym;
+ sym->alias = str;
+ str->number = sym->number;
+ symbol_type_set (str, sym->type_name, loc);
+ }
+}
+
+
+/*---------------------------------------------------------.
+| Check that THIS, and its alias, have same precedence and |
+| associativity. |
+`---------------------------------------------------------*/
+
+static inline void
+symbol_check_alias_consistency (symbol *this)
+{
+ symbol *sym = this;
+ symbol *str = this->alias;
+
+ /* Check only the symbol in the symbol-string pair. */
+ if (!(this->alias
+ && this->user_token_number == USER_NUMBER_HAS_STRING_ALIAS))
+ return;
+
+ if (str->type_name != sym->type_name)
+ {
+ if (str->type_name)
+ symbol_type_set (sym, str->type_name, str->type_location);
+ else
+ symbol_type_set (str, sym->type_name, sym->type_location);
+ }
+
+
+ if (str->destructor.code || sym->destructor.code)
+ {
+ if (str->destructor.code)
+ symbol_destructor_set (sym, &str->destructor);
+ else
+ symbol_destructor_set (str, &sym->destructor);
+ }
+
+ if (str->printer.code || sym->printer.code)
+ {
+ if (str->printer.code)
+ symbol_printer_set (sym, &str->printer);
+ else
+ symbol_printer_set (str, &sym->printer);
+ }
+
+ if (sym->prec || str->prec)
+ {
+ if (str->prec)
+ symbol_precedence_set (sym, str->prec, str->assoc,
+ str->prec_location);
+ else
+ symbol_precedence_set (str, sym->prec, sym->assoc,
+ sym->prec_location);
+ }
+}
+
+static bool
+symbol_check_alias_consistency_processor (void *this,
+ void *null ATTRIBUTE_UNUSED)
+{
+ symbol_check_alias_consistency (this);
+ return true;
+}
+
+
+/*-------------------------------------------------------------------.
+| Assign a symbol number, and write the definition of the token name |
+| into FDEFINES. Put in SYMBOLS. |
+`-------------------------------------------------------------------*/
+
+static inline bool
+symbol_pack (symbol *this)
+{
+ aver (this->number != NUMBER_UNDEFINED);
+ if (this->class == nterm_sym)
+ this->number += ntokens;
+ else if (this->user_token_number == USER_NUMBER_HAS_STRING_ALIAS)
+ return true;
+
+ symbols[this->number] = this;
+ return true;
+}
+
+static bool
+symbol_pack_processor (void *this, void *null ATTRIBUTE_UNUSED)
+{
+ return symbol_pack (this);
+}
+
+
+static void
+user_token_number_redeclaration (int num, symbol *first, symbol *second)
+{
+ /* User token numbers are not assigned during the parsing, but in a
+ second step, via a traversal of the symbol table sorted on tag.
+
+ However, error messages make more sense if we keep the first
+ declaration first. */
+ if (location_cmp (first->location, second->location) > 0)
+ {
+ symbol* tmp = first;
+ 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);
+}
+
+/*--------------------------------------------------.
+| Put THIS in TOKEN_TRANSLATIONS if it is a token. |
+`--------------------------------------------------*/
+
+static inline bool
+symbol_translation (symbol *this)
+{
+ /* Non-terminal? */
+ if (this->class == token_sym
+ && this->user_token_number != USER_NUMBER_HAS_STRING_ALIAS)
+ {
+ /* A token which translation has already been set? */
+ if (token_translations[this->user_token_number] != undeftoken->number)
+ user_token_number_redeclaration
+ (this->user_token_number,
+ symbols[token_translations[this->user_token_number]],
+ this);
+
+ token_translations[this->user_token_number] = this->number;
+ }
+
+ return true;
+}
+
+static bool
+symbol_translation_processor (void *this, void *null ATTRIBUTE_UNUSED)
+{
+ return symbol_translation (this);
+}
+
+
+/*---------------------------------------.
+| Symbol and semantic type hash tables. |
+`---------------------------------------*/
+
+/* Initial capacity of symbol and semantic type hash table. */
+#define HT_INITIAL_CAPACITY 257
+
+static struct hash_table *symbol_table = NULL;
+static struct hash_table *semantic_type_table = NULL;
+
+static inline bool
+hash_compare_symbol (const symbol *m1, const symbol *m2)
projects / bison.git / blobdiff