/* Symbol table manager for Bison.
- Copyright (C) 1984, 1989, 2000, 2001, 2002, 2004 Free Software
+ Copyright (C) 1984, 1989, 2000-2002, 2004-2012 Free Software
Foundation, Inc.
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
- 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
- along with Bison; see the file COPYING. If not, write to
- the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
-
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+#include <config.h>
#include "system.h"
#include <hash.h>
-#include <quotearg.h>
#include "complain.h"
#include "gram.h"
#include "symtab.h"
+/*-------------------------------------------------------------------.
+| Symbols sorted by tag. Allocated by the first invocation of |
+| symbols_do, after which no more symbols should be created. |
+`-------------------------------------------------------------------*/
+
+static symbol **symbols_sorted = NULL;
+static symbol **semantic_types_sorted = NULL;
+
/*------------------------.
| Distinguished symbols. |
`------------------------*/
symbol *startsymbol = NULL;
location startsymbol_location;
+
/*---------------------------------.
| Create a new symbol, named TAG. |
`---------------------------------*/
static symbol *
symbol_new (uniqstr tag, location loc)
{
- symbol *res = MALLOC (res, 1);
+ 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, '-'))
+ complain (&loc, Wyacc,
+ _("POSIX Yacc forbids dashes in symbol names: %s"), tag);
+
res->tag = tag;
res->location = loc;
res->type_name = NULL;
- res->destructor = NULL;
- res->printer = NULL;
+ for (int i = 0; i < CODE_PROPS_SIZE; ++i)
+ code_props_none_init (&res->props[i]);
res->number = NUMBER_UNDEFINED;
res->prec = 0;
res->alias = NULL;
res->class = unknown_sym;
+ res->status = undeclared;
+ if (nsyms == SYMBOL_NUMBER_MAXIMUM)
+ complain (NULL, fatal, _("too many symbols in input grammar (limit is %d)"),
+ SYMBOL_NUMBER_MAXIMUM);
nsyms++;
return res;
}
+char const *
+code_props_type_string (code_props_type kind)
+{
+ switch (kind)
+ {
+ case destructor:
+ return "%destructor";
+ case printer:
+ return "%printer";
+ }
+ assert (0);
+}
+
+/*----------------------------------------.
+| Create a new semantic type, named TAG. |
+`----------------------------------------*/
+
+static semantic_type *
+semantic_type_new (uniqstr tag, const location *loc)
+{
+ semantic_type *res = xmalloc (sizeof *res);
+
+ uniqstr_assert (tag);
+ res->tag = tag;
+ if (loc)
+ res->location = *loc;
+ for (int i = 0; i < CODE_PROPS_SIZE; ++i)
+ code_props_none_init (&res->props[i]);
+
+ return res;
+}
+
+
+/*-----------------.
+| Print a symbol. |
+`-----------------*/
+
+#define SYMBOL_ATTR_PRINT(Attr) \
+ if (s->Attr) \
+ fprintf (f, " %s { %s }", #Attr, s->Attr)
+
+#define SYMBOL_CODE_PRINT(Attr) \
+ if (s->props[Attr].code) \
+ fprintf (f, " %s { %s }", #Attr, s->props[Attr].code)
+
+void
+symbol_print (symbol const *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
+
+
+/*----------------------------------.
+| Whether S is a valid identifier. |
+`----------------------------------*/
+
+static bool
+is_identifier (uniqstr s)
+{
+ static char const alphanum[26 + 26 + 1 + 10] =
+ "abcdefghijklmnopqrstuvwxyz"
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "_"
+ "0123456789";
+ if (!s || ! memchr (alphanum, *s, sizeof alphanum - 10))
+ return false;
+ for (++s; *s; ++s)
+ if (! memchr (alphanum, *s, sizeof alphanum))
+ return false;
+ return true;
+}
+
+
+/*-----------------------------------------------.
+| Get the identifier associated to this symbol. |
+`-----------------------------------------------*/
+uniqstr
+symbol_id_get (symbol const *sym)
+{
+ aver (sym->user_token_number != USER_NUMBER_HAS_STRING_ALIAS);
+ if (sym->alias)
+ sym = sym->alias;
+ return is_identifier (sym->tag) ? sym->tag : 0;
+}
+
+
+/*------------------------------------------------------------------.
+| 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)
+{
+ 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)
+{
+ 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"));
+}
+
+
/*-----------------------------------------------------------------.
| Set the TYPE_NAME associated with SYM. Does nothing if passed 0 |
if (type_name)
{
if (sym->type_name)
- complain_at (loc, _("type redeclaration for %s"), sym->tag);
+ 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. Do nothing if passed 0. |
-`------------------------------------------------------------------*/
+/*--------------------------------------------------------.
+| Set the DESTRUCTOR or PRINTER associated with the SYM. |
+`--------------------------------------------------------*/
void
-symbol_destructor_set (symbol *sym, char *destructor, location loc)
+symbol_code_props_set (symbol *sym, code_props_type kind,
+ code_props const *code)
{
- if (destructor)
- {
- if (sym->destructor)
- complain_at (loc, _("%s redeclaration for %s"),
- "%destructor", sym->tag);
- sym->destructor = destructor;
- sym->destructor_location = loc;
- }
+ if (sym->props[kind].code)
+ symbol_redeclaration (sym, code_props_type_string (kind),
+ sym->props[kind].location,
+ code->location);
+ sym->props[kind] = *code;
}
-
-/*---------------------------------------------------------------.
-| Set the PRINTER associated with SYM. Do nothing if passed 0. |
-`---------------------------------------------------------------*/
+/*-----------------------------------------------------.
+| Set the DESTRUCTOR or PRINTER associated with TYPE. |
+`-----------------------------------------------------*/
void
-symbol_printer_set (symbol *sym, char *printer, location loc)
+semantic_type_code_props_set (semantic_type *type,
+ code_props_type kind,
+ code_props const *code)
{
- if (printer)
+ if (type->props[kind].code)
+ semantic_type_redeclaration (type, code_props_type_string (kind),
+ type->props[kind].location,
+ code->location);
+ type->props[kind] = *code;
+}
+
+/*---------------------------------------------------.
+| Get the computed %destructor or %printer for SYM. |
+`---------------------------------------------------*/
+
+code_props *
+symbol_code_props_get (symbol *sym, code_props_type kind)
+{
+ /* Per-symbol code props. */
+ if (sym->props[kind].code)
+ return &sym->props[kind];
+
+ /* Per-type code props. */
+ if (sym->type_name)
{
- if (sym->printer)
- complain_at (loc, _("%s redeclaration for %s"),
- "%printer", sym->tag);
- sym->printer = printer;
- sym->printer_location = loc;
+ 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)
+ {
+ code_props *code =
+ &semantic_type_get (sym->type_name ? "*" : "", NULL)->props[kind];
+ if (code->code)
+ return code;
+ }
+ return &code_props_none;
+}
/*-----------------------------------------------------------------.
| Set the PRECEDENCE associated with SYM. Does nothing if invoked |
if (a != undef_assoc)
{
if (sym->prec != 0)
- complain_at (loc, _("redefining precedence of %s"), sym->tag);
+ 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);
+ 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)
{
+ bool warned = false;
if (sym->class != unknown_sym && sym->class != class)
- complain_at (loc, _("symbol %s redefined"), sym->tag);
+ {
+ complain (&loc, complaint, _("symbol %s redefined"), sym->tag);
+ // Don't report both "redefined" and "redeclared".
+ warned = true;
+ }
if (class == nterm_sym && sym->class != nterm_sym)
sym->number = nvars++;
sym->number = ntokens++;
sym->class = class;
+
+ if (declaring)
+ {
+ if (sym->status == declared && !warned)
+ complain (&loc, Wother, _("symbol %s redeclared"), sym->tag);
+ sym->status = declared;
+ }
}
void
symbol_user_token_number_set (symbol *sym, int user_token_number, location loc)
{
- if (sym->class != token_sym)
- abort ();
+ int *user_token_numberp;
- if (sym->user_token_number != USER_NUMBER_UNDEFINED
- && sym->user_token_number != user_token_number)
- complain_at (loc, _("redefining user token number of %s"), sym->tag);
+ 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 (&loc, complaint, _("redefining user token number of %s"),
+ sym->tag);
- sym->user_token_number = user_token_number;
+ *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;
+ NTOKENS. */
+ if (endtoken->number != NUMBER_UNDEFINED)
+ --ntokens;
+ endtoken->number = 0;
}
}
{
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);
+ 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++;
}
+ for (int 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, "*"))
+ {
+ for (int 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;
}
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);
+}
-/*------------------------------------------------------------------.
-| Declare the new symbol SYM. Make it an alias of SYMVAL, and type |
-| SYMVAL with SYM's type. |
-`------------------------------------------------------------------*/
void
-symbol_make_alias (symbol *sym, symbol *symval, location loc)
+symbol_make_alias (symbol *sym, symbol *str, location loc)
{
- if (symval->alias)
- warn_at (loc, _("symbol `%s' used more than once as a literal string"),
- symval->tag);
+ if (str->alias)
+ 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
{
- symval->class = token_sym;
- symval->user_token_number = sym->user_token_number;
- sym->user_token_number = USER_NUMBER_ALIAS;
- symval->alias = sym;
- sym->alias = symval;
- /* sym and symval combined are only one symbol. */
- nsyms--;
- ntokens--;
- if (ntokens != sym->number && ntokens != symval->number)
- abort ();
- sym->number = symval->number =
- (symval->number < sym->number) ? symval->number : sym->number;
- symbol_type_set (symval, sym->type_name, loc);
+ 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);
}
}
| associativity. |
`---------------------------------------------------------*/
-static inline bool
+static inline void
symbol_check_alias_consistency (symbol *this)
{
- /* Check only those who _are_ the aliases. */
- if (this->alias && this->user_token_number == USER_NUMBER_ALIAS)
+ 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 (this->prec != this->alias->prec)
- {
- if (this->prec != 0 && this->alias->prec != 0)
- complain_at (this->alias->location,
- _("conflicting precedences for %s and %s"),
- this->tag, this->alias->tag);
- if (this->prec != 0)
- this->alias->prec = this->prec;
- else
- this->prec = this->alias->prec;
- }
-
- if (this->assoc != this->alias->assoc)
- {
- if (this->assoc != undef_assoc && this->alias->assoc != undef_assoc)
- complain_at (this->alias->location,
- _("conflicting associativities for %s (%s) and %s (%s)"),
- this->tag, assoc_to_string (this->assoc),
- this->alias->tag, assoc_to_string (this->alias->assoc));
- if (this->assoc != undef_assoc)
- this->alias->assoc = this->assoc;
- else
- this->assoc = this->alias->assoc;
- }
+ 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);
+ }
+
+
+ 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]);
+
+ 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);
}
- return true;
}
static bool
symbol_check_alias_consistency_processor (void *this,
- void *null ATTRIBUTE_UNUSED)
+ void *null ATTRIBUTE_UNUSED)
{
- return symbol_check_alias_consistency (this);
+ symbol_check_alias_consistency (this);
+ return true;
}
static inline bool
symbol_pack (symbol *this)
{
+ aver (this->number != NUMBER_UNDEFINED);
if (this->class == nterm_sym)
- {
- this->number += ntokens;
- }
- else if (this->alias)
- {
- /* This symbol and its alias are a single token defn.
- Allocate a tokno, and assign to both check agreement of
- prec and assoc fields and make both the same */
- if (this->number == NUMBER_UNDEFINED)
- {
- if (this == endtoken || this->alias == endtoken)
- this->number = this->alias->number = 0;
- else
- {
- if (this->alias->number == NUMBER_UNDEFINED)
- abort ();
- this->number = this->alias->number;
- }
- }
- /* Do not do processing below for USER_NUMBER_ALIASes. */
- if (this->user_token_number == USER_NUMBER_ALIAS)
- return true;
- }
- else /* this->class == token_sym */
- {
- if (this->number == NUMBER_UNDEFINED)
- abort ();
- }
+ this->number += ntokens;
+ else if (this->user_token_number == USER_NUMBER_HAS_STRING_ALIAS)
+ return true;
symbols[this->number] = this;
return true;
}
+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.
+ 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_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);
+}
/*--------------------------------------------------.
| Put THIS in TOKEN_TRANSLATIONS if it is a token. |
{
/* Non-terminal? */
if (this->class == token_sym
- && this->user_token_number != USER_NUMBER_ALIAS)
+ && 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)
- complain_at (this->location,
- _("tokens %s and %s both assigned number %d"),
- symbols[token_translations[this->user_token_number]]->tag,
- this->tag, this->user_token_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;
}
}
-/*----------------------.
-| A symbol hash table. |
-`----------------------*/
+/*---------------------------------------.
+| Symbol and semantic type hash tables. |
+`---------------------------------------*/
-/* Initial capacity of symbols hash table. */
+/* 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)
return UNIQSTR_EQ (m1->tag, m2->tag);
}
+static inline bool
+hash_compare_semantic_type (const semantic_type *m1, const semantic_type *m2)
+{
+ /* Since names are unique, we can compare the pointers themselves. */
+ return UNIQSTR_EQ (m1->tag, m2->tag);
+}
+
static bool
hash_symbol_comparator (void const *m1, void const *m2)
{
return hash_compare_symbol (m1, m2);
}
+static bool
+hash_semantic_type_comparator (void const *m1, void const *m2)
+{
+ return hash_compare_semantic_type (m1, m2);
+}
+
static inline size_t
hash_symbol (const symbol *m, size_t tablesize)
{
return ((uintptr_t) m->tag) % tablesize;
}
+static inline size_t
+hash_semantic_type (const semantic_type *m, size_t tablesize)
+{
+ /* Since names are unique, we can hash the pointer itself. */
+ return ((uintptr_t) m->tag) % tablesize;
+}
+
static size_t
hash_symbol_hasher (void const *m, size_t tablesize)
{
return hash_symbol (m, tablesize);
}
+static size_t
+hash_semantic_type_hasher (void const *m, size_t tablesize)
+{
+ return hash_semantic_type (m, tablesize);
+}
/*-------------------------------.
| Create the symbol hash table. |
symbols_new (void)
{
symbol_table = hash_initialize (HT_INITIAL_CAPACITY,
- NULL,
- hash_symbol_hasher,
- hash_symbol_comparator,
- free);
+ NULL,
+ hash_symbol_hasher,
+ hash_symbol_comparator,
+ free);
+ semantic_type_table = hash_initialize (HT_INITIAL_CAPACITY,
+ NULL,
+ hash_semantic_type_hasher,
+ hash_semantic_type_comparator,
+ free);
}
`----------------------------------------------------------------*/
symbol *
-symbol_get (const char *key, location loc)
+symbol_from_uniqstr (const uniqstr key, location loc)
{
symbol probe;
symbol *entry;
- /* Keep the symbol in a printable form. */
- key = uniqstr_new (quotearg_style (escape_quoting_style, key));
probe.tag = key;
entry = hash_lookup (symbol_table, &probe);
if (!entry)
{
/* First insertion in the hash. */
+ aver (!symbols_sorted);
entry = symbol_new (key, loc);
- hash_insert (symbol_table, entry);
+ if (!hash_insert (symbol_table, entry))
+ xalloc_die ();
}
return entry;
}
+/*-----------------------------------------------------------------------.
+| Find the semantic type named KEY, and return it. If it does not exist |
+| yet, create it. |
+`-----------------------------------------------------------------------*/
+
+semantic_type *
+semantic_type_from_uniqstr (const uniqstr key, const location *loc)
+{
+ semantic_type probe;
+ semantic_type *entry;
+
+ probe.tag = key;
+ entry = hash_lookup (semantic_type_table, &probe);
+
+ if (!entry)
+ {
+ /* First insertion in the hash. */
+ entry = semantic_type_new (key, loc);
+ if (!hash_insert (semantic_type_table, entry))
+ xalloc_die ();
+ }
+ return entry;
+}
+
+
+/*----------------------------------------------------------------.
+| 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);
+}
+
+
+/*-----------------------------------------------------------------------.
+| Find the semantic type named KEY, and return it. If it does not exist |
+| yet, create it. |
+`-----------------------------------------------------------------------*/
+
+semantic_type *
+semantic_type_get (const char *key, const location *loc)
+{
+ return semantic_type_from_uniqstr (uniqstr_new (key), loc);
+}
+
+
/*------------------------------------------------------------------.
| Generate a dummy nonterminal, whose name cannot conflict with the |
| user's names. |
symbol *sym;
- sprintf (buf, "@%d", ++dummy_count);
+ sprintf (buf, "$@%d", ++dummy_count);
sym = symbol_get (buf, loc);
sym->class = nterm_sym;
sym->number = nvars++;
return sym;
}
+bool
+symbol_is_dummy (const symbol *sym)
+{
+ return sym->tag[0] == '@' || (sym->tag[0] == '$' && sym->tag[1] == '@');
+}
/*-------------------.
| Free the symbols. |
symbols_free (void)
{
hash_free (symbol_table);
+ hash_free (semantic_type_table);
free (symbols);
+ free (symbols_sorted);
}
| terminals. |
`---------------------------------------------------------------*/
-static void
-symbols_do (Hash_processor processor, void *processor_data)
+static int
+symbols_cmp (symbol const *a, symbol const *b)
{
- hash_do_for_each (symbol_table, processor, processor_data);
+ return strcmp (a->tag, b->tag);
}
+static int
+symbols_cmp_qsort (void const *a, void const *b)
+{
+ return symbols_cmp (*(symbol * const *)a, *(symbol * const *)b);
+}
+
+static void
+symbols_do (Hash_processor processor, void *processor_data,
+ struct hash_table *table, symbol **sorted)
+{
+ size_t count = hash_get_n_entries (table);
+ if (!sorted)
+ {
+ 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);
+ }
+}
/*--------------------------------------------------------------.
| Check that all the symbols are defined. Report any undefined |
void
symbols_check_defined (void)
{
- symbols_do (symbol_check_defined_processor, NULL);
+ symbols_do (symbol_check_defined_processor, NULL,
+ symbol_table, symbols_sorted);
+ symbols_do (semantic_type_check_defined_processor, NULL,
+ semantic_type_table, semantic_types_sorted);
}
/*------------------------------------------------------------------.
{
symbol *this = symbols[i];
if (this->user_token_number != USER_NUMBER_UNDEFINED)
- {
- if (this->user_token_number > max_user_token_number)
- max_user_token_number = this->user_token_number;
- if (this->user_token_number == 256)
- num_256_available_p = false;
- }
+ {
+ if (this->user_token_number > max_user_token_number)
+ max_user_token_number = this->user_token_number;
+ if (this->user_token_number == 256)
+ num_256_available_p = false;
+ }
}
/* If 256 is not used, assign it to error, to follow POSIX. */
{
symbol *this = symbols[i];
if (this->user_token_number == USER_NUMBER_UNDEFINED)
- this->user_token_number = ++max_user_token_number;
+ this->user_token_number = ++max_user_token_number;
if (this->user_token_number > max_user_token_number)
- max_user_token_number = this->user_token_number;
+ max_user_token_number = this->user_token_number;
}
- CALLOC (token_translations, max_user_token_number + 1);
+ token_translations = xnmalloc (max_user_token_number + 1,
+ sizeof *token_translations);
- /* Initialize all entries for literal tokens to 2, the internal
- token number for $undefined, which represents all invalid inputs.
- */
+ /* Initialize all entries for literal tokens to the internal token
+ number for $undefined, which represents all invalid inputs. */
for (i = 0; i < max_user_token_number + 1; i++)
token_translations[i] = undeftoken->number;
- symbols_do (symbol_translation_processor, NULL);
+ symbols_do (symbol_translation_processor, NULL,
+ symbol_table, symbols_sorted);
}
void
symbols_pack (void)
{
- CALLOC (symbols, nsyms);
-
- symbols_do (symbol_check_alias_consistency_processor, NULL);
- symbols_do (symbol_pack_processor, NULL);
+ symbols_do (symbol_check_alias_consistency_processor, NULL,
+ symbol_table, symbols_sorted);
+
+ symbols = xcalloc (nsyms, sizeof *symbols);
+ symbols_do (symbol_pack_processor, NULL, symbol_table, symbols_sorted);
+
+ /* Aliases leave empty slots in symbols, so remove them. */
+ {
+ int writei;
+ int readi;
+ int nsyms_old = nsyms;
+ for (writei = 0, readi = 0; readi < nsyms_old; readi += 1)
+ {
+ if (symbols[readi] == NULL)
+ {
+ nsyms -= 1;
+ ntokens -= 1;
+ }
+ else
+ {
+ symbols[writei] = symbols[readi];
+ symbols[writei]->number = writei;
+ if (symbols[writei]->alias)
+ symbols[writei]->alias->number = writei;
+ writei += 1;
+ }
+ }
+ }
+ symbols = xnrealloc (symbols, nsyms, sizeof *symbols);
symbols_token_translations_init ();
if (startsymbol->class == unknown_sym)
- fatal_at (startsymbol_location,
- _("the start symbol %s is undefined"),
- startsymbol->tag);
+ complain (&startsymbol_location, fatal,
+ _("the start symbol %s is undefined"),
+ startsymbol->tag);
else if (startsymbol->class == token_sym)
- fatal_at (startsymbol_location,
- _("the start symbol %s is a token"),
- startsymbol->tag);
+ complain (&startsymbol_location, fatal,
+ _("the start symbol %s is a token"),
+ startsymbol->tag);
}
projects / bison.git / blobdiff