/* 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.
`-------------------------------------------------------------------*/
static symbol **symbols_sorted = NULL;
+static symbol **semantic_types_sorted = NULL;
/*------------------------.
| Distinguished symbols. |
symbol *startsymbol = NULL;
location startsymbol_location;
-/*---------------------------------------.
-| Default %destructor's and %printer's. |
-`---------------------------------------*/
+/*---------------------------.
+| Precedence relation graph. |
+`---------------------------*/
-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,
- };
+static symgraph **prec_nodes;
+
+/*-----------------------------------.
+| Store which associativity is used. |
+`-----------------------------------*/
+
+bool *used_assoc = NULL;
/*---------------------------------.
| Create a new symbol, named TAG. |
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;
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)
`----------------------------------------*/
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;
}
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)
{
- fprintf (f, "\"%s\"", s->tag);
+ fputs (s->tag, f);
SYMBOL_ATTR_PRINT (type_name);
SYMBOL_CODE_PRINT (destructor);
SYMBOL_CODE_PRINT (printer);
}
else
- fprintf (f, "<NULL>");
+ fputs ("<NULL>", f);
}
#undef SYMBOL_ATTR_PRINT
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"));
}
{
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;
+ else
+ {
+ uniqstr_assert (type_name);
+ sym->type_name = type_name;
+ sym->type_location = loc;
+ }
}
}
symbol_redeclaration (sym, code_props_type_string (kind),
sym->props[kind].location,
code->location);
- sym->props[kind] = *code;
+ else
+ sym->props[kind] = *code;
}
/*-----------------------------------------------------.
semantic_type_redeclaration (type, code_props_type_string (kind),
type->props[kind].location,
code->location);
- type->props[kind] = *code;
+ else
+ type->props[kind] = *code;
}
/*---------------------------------------------------.
| 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)
/* 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;
}
/*-----------------------------------------------------------------.
{
if (a != undef_assoc)
{
- if (sym->prec != 0)
+ if (sym->prec)
symbol_redeclaration (sym, assoc_to_string (a), sym->prec_location,
loc);
- sym->prec = prec;
- sym->assoc = a;
- sym->prec_location = loc;
+ else
+ {
+ sym->prec = prec;
+ sym->assoc = a;
+ sym->prec_location = loc;
+ }
}
/* Only terminals have a precedence. */
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;
}
if (declaring)
{
if (sym->status == declared && !warned)
- warn_at (loc, _("symbol %s redeclared"), sym->tag);
- sym->status = declared;
+ complain (&loc, Wother, _("symbol %s redeclared"), sym->tag);
+ else
+ sym->status = declared;
}
}
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? */
{
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;
}
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;
}
- 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)
{
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.
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);
}
/*--------------------------------------------------.
(this->user_token_number,
symbols[token_translations[this->user_token_number]],
this);
-
- token_translations[this->user_token_number] = this->number;
+ else
+ token_translations[this->user_token_number] = this->number;
}
return true;
`-----------------------------------------------------------------------*/
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;
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 ();
}
`-----------------------------------------------------------------------*/
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);
}
hash_free (semantic_type_table);
free (symbols);
free (symbols_sorted);
+ free (semantic_types_sorted);
}
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);
}
}
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);
}
/*------------------------------------------------------------------.
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);
}
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. */
{
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);
}
+/*---------------------------------.
+| Initialize relation graph nodes. |
+`---------------------------------*/
-/*--------------------------------------------------.
-| Set default tagged/tagless %destructor/%printer. |
-`--------------------------------------------------*/
+static void
+init_prec_nodes (void)
+{
+ int i;
+ prec_nodes = xcalloc (nsyms, sizeof *prec_nodes);
+ for (i = 0; i < nsyms; ++i)
+ {
+ prec_nodes[i] = xmalloc (sizeof *prec_nodes[i]);
+ symgraph *s = prec_nodes[i];
+ s->id = i;
+ s->succ = 0;
+ s->pred = 0;
+ }
+}
-void
-default_tagged_code_props_set (code_props_type kind, code_props const *code)
+/*----------------.
+| Create a link. |
+`----------------*/
+
+static symgraphlink *
+symgraphlink_new (graphid id, symgraphlink *next)
{
- if (default_tagged_code_props[kind].code)
+ symgraphlink *l = xmalloc (sizeof *l);
+ l->id = id;
+ l->next = next;
+ return l;
+}
+
+
+/*------------------------------------------------------------------.
+| Register the second symbol of the precedence relation, and return |
+| whether this relation is new. Use only in register_precedence. |
+`------------------------------------------------------------------*/
+
+static bool
+register_precedence_second_symbol (symgraphlink **first, graphid sym)
+{
+ if (!*first || sym < (*first)->id)
+ *first = symgraphlink_new (sym, *first);
+ else
{
- complain_at (code->location,
- _("redeclaration for default tagged %s"),
- code_props_type_string (kind));
- complain_at (default_tagged_code_props[kind].location,
- _("previous declaration"));
+ symgraphlink *slist = *first;
+
+ while (slist->next && slist->next->id <= sym)
+ slist = slist->next;
+
+ if (slist->id == sym)
+ /* Relation already present. */
+ return false;
+
+ slist->next = symgraphlink_new (sym, slist->next);
}
- default_tagged_code_props[kind] = *code;
+ return true;
}
+/*------------------------------------------------------------------.
+| Register a new relation between symbols as used. The first symbol |
+| has a greater precedence than the second one. |
+`------------------------------------------------------------------*/
+
void
-default_tagless_code_props_set (code_props_type kind, code_props const *code)
+register_precedence (graphid first, graphid snd)
{
- if (default_tagless_code_props[kind].code)
+ if (!prec_nodes)
+ init_prec_nodes ();
+ register_precedence_second_symbol (&(prec_nodes[first]->succ), snd);
+ register_precedence_second_symbol (&(prec_nodes[snd]->pred), first);
+}
+
+
+/*---------------------------------------.
+| Deep clear a linked / adjacency list). |
+`---------------------------------------*/
+
+static void
+linkedlist_free (symgraphlink *node)
+{
+ if (node)
{
- complain_at (code->location,
- _("redeclaration for default tagless %s"),
- code_props_type_string (kind));
- complain_at (default_tagless_code_props[kind].location,
- _("previous declaration"));
+ while (node->next)
+ {
+ symgraphlink *tmp = node->next;
+ free (node);
+ node = tmp;
+ }
+ free (node);
+ }
+}
+
+/*----------------------------------------------.
+| Clear and destroy association tracking table. |
+`----------------------------------------------*/
+
+static void
+assoc_free (void)
+{
+ int i;
+ for (i = 0; i < nsyms; ++i)
+ {
+ linkedlist_free (prec_nodes[i]->pred);
+ linkedlist_free (prec_nodes[i]->succ);
+ free (prec_nodes[i]);
}
- default_tagless_code_props[kind] = *code;
+ free (prec_nodes);
+}
+
+/*---------------------------------------.
+| Initialize association tracking table. |
+`---------------------------------------*/
+
+static void
+init_assoc (void)
+{
+ graphid i;
+ used_assoc = xcalloc (nsyms, sizeof *used_assoc);
+ for (i = 0; i < nsyms; ++i)
+ used_assoc[i] = false;
+}
+
+/*------------------------------------------------------------------.
+| Test if the associativity for the symbols is defined and useless. |
+`------------------------------------------------------------------*/
+
+static inline bool
+is_assoc_useless (symbol *s)
+{
+ return s
+ && s->assoc != undef_assoc
+ && s->assoc != precedence_assoc
+ && !used_assoc[s->number];
+}
+
+/*-------------------------------.
+| Register a used associativity. |
+`-------------------------------*/
+
+void
+register_assoc (graphid i, graphid j)
+{
+ if (!used_assoc)
+ init_assoc ();
+ used_assoc[i] = true;
+ used_assoc[j] = true;
}
+/*--------------------------------------------------.
+| Print a warning for unused precedence relations. |
+`--------------------------------------------------*/
+
+void
+print_precedence_warnings (void)
+{
+ int i;
+ if (!prec_nodes)
+ init_prec_nodes ();
+ if (!used_assoc)
+ init_assoc ();
+ for (i = 0; i < nsyms; ++i)
+ {
+ symbol *s = symbols[i];
+ if (s
+ && s->prec != 0
+ && !prec_nodes[i]->pred
+ && !prec_nodes[i]->succ)
+ {
+ if (is_assoc_useless (s))
+ complain (&s->prec_location, Wprecedence,
+ _("useless precedence and associativity for %s"), s->tag);
+ else if (s->assoc == precedence_assoc)
+ complain (&s->prec_location, Wprecedence,
+ _("useless precedence for %s"), s->tag);
+ }
+ else if (is_assoc_useless (s))
+ complain (&s->prec_location, Wprecedence,
+ _("useless associativity for %s, use %%precedence"), s->tag);
+ }
+ free (used_assoc);
+ assoc_free ();
+}
projects / bison.git / blobdiff