X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/44536b35c464a01320ce13a835e6ba75d2c6fd00..7029f8927fff6c48dfc1e1b26b8e3b8d473fa1ad:/src/symtab.c diff --git a/src/symtab.c b/src/symtab.c index c921133d..8cbfc54f 100644 --- a/src/symtab.c +++ b/src/symtab.c @@ -1,5 +1,7 @@ -/* Symbol table manager for Bison, - Copyright (C) 1984, 1989, 2000, 2001, 2002 Free Software Foundation, Inc. +/* Symbol table manager for Bison. + + Copyright (C) 1984, 1989, 2000, 2001, 2002, 2004, 2005 Free Software + Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -15,115 +17,209 @@ 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. */ + the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, + Boston, MA 02110-1301, USA. */ #include "system.h" -#include "hash.h" + +#include +#include + #include "complain.h" -#include "symtab.h" #include "gram.h" +#include "symtab.h" /*------------------------. | Distinguished symbols. | `------------------------*/ -symbol_t *errtoken = NULL; -symbol_t *undeftoken = NULL; -symbol_t *eoftoken = NULL; -symbol_t *axiom = NULL; -symbol_t *startsymbol = NULL; +symbol *errtoken = NULL; +symbol *undeftoken = NULL; +symbol *endtoken = NULL; +symbol *accept = NULL; +symbol *startsymbol = NULL; +location startsymbol_location; /*---------------------------------. | Create a new symbol, named TAG. | `---------------------------------*/ -static symbol_t * -symbol_new (const char *tag) +static symbol * +symbol_new (uniqstr tag, location loc) { - symbol_t *res = XMALLOC (symbol_t, 1); + symbol *res = xmalloc (sizeof *res); + + uniqstr_assert (tag); + res->tag = tag; + res->location = loc; - res->tag = xstrdup (tag); res->type_name = NULL; + res->destructor = NULL; + res->printer = NULL; + res->number = NUMBER_UNDEFINED; res->prec = 0; - res->assoc = right_assoc; + res->assoc = undef_assoc; res->user_token_number = USER_NUMBER_UNDEFINED; + res->alias = NULL; res->class = unknown_sym; + if (nsyms == SYMBOL_NUMBER_MAXIMUM) + fatal (_("too many symbols in input grammar (limit is %d)"), + SYMBOL_NUMBER_MAXIMUM); nsyms++; - return res; } -/*-----------------------------------------. -| Set the TYPE_NAME associated to SYMBOL. | -`-----------------------------------------*/ +/*-----------------. +| Print a symbol. | +`-----------------*/ + +#define SYMBOL_ATTR_PRINT(Attr) \ + if (s->Attr) \ + fprintf (f, " %s { %s }", #Attr, s->Attr) + +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); +} + +#undef SYMBOL_ATTR_PRINT + +/*------------------------------------------------------------------. +| Complain that S's WHAT is redeclared at SECOND, and was first set | +| at FIRST. | +`------------------------------------------------------------------*/ + +static void +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")); +} + + +/*-----------------------------------------------------------------. +| 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) + 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. | +`------------------------------------------------------------------*/ + +void +symbol_destructor_set (symbol *sym, const char *destructor, location loc) +{ + if (destructor) + { + if (sym->destructor) + redeclaration (sym, "%destructor", sym->destructor_location, loc); + sym->destructor = destructor; + sym->destructor_location = loc; + } +} + + +/*---------------------------------------------------------------. +| Set the PRINTER associated with SYM. Do nothing if passed 0. | +`---------------------------------------------------------------*/ void -symbol_type_set (symbol_t *symbol, char *type_name) +symbol_printer_set (symbol *sym, const char *printer, location loc) { - if (symbol->type_name) - complain (_("type redeclaration for %s"), symbol->tag); - symbol->type_name = type_name; + if (printer) + { + if (sym->printer) + redeclaration (sym, "%printer", sym->destructor_location, loc); + sym->printer = printer; + sym->printer_location = loc; + } } -/*------------------------------------------. -| Set the PRECEDENCE associated to SYMBOL. | -`------------------------------------------*/ +/*-----------------------------------------------------------------. +| Set the PRECEDENCE associated with SYM. Does nothing if invoked | +| with UNDEF_ASSOC as ASSOC. | +`-----------------------------------------------------------------*/ void -symbol_precedence_set (symbol_t *symbol, - int prec, associativity assoc) +symbol_precedence_set (symbol *sym, int prec, assoc a, location loc) { - if (symbol->prec != 0) - complain (_("redefining precedence of %s"), symbol->tag); - symbol->prec = prec; - symbol->assoc = assoc; + if (a != undef_assoc) + { + if (sym->prec != 0) + 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); } -/*-------------------------------------. -| Set the CLASS associated to SYMBOL. | -`-------------------------------------*/ +/*------------------------------------. +| Set the CLASS associated with SYM. | +`------------------------------------*/ void -symbol_class_set (symbol_t *symbol, symbol_class class) +symbol_class_set (symbol *sym, symbol_class class, location loc) { - if (symbol->class != unknown_sym && symbol->class != class) - complain (_("symbol %s redefined"), symbol->tag); + if (sym->class != unknown_sym && sym->class != class) + complain_at (loc, _("symbol %s redefined"), sym->tag); - if (class == nterm_sym && symbol->class != nterm_sym) - symbol->number = nvars++; - else if (class == token_sym && symbol->number == NUMBER_UNDEFINED) - symbol->number = ntokens++; + if (class == nterm_sym && sym->class != nterm_sym) + sym->number = nvars++; + else if (class == token_sym && sym->number == NUMBER_UNDEFINED) + sym->number = ntokens++; - symbol->class = class; + sym->class = class; } -/*-------------------------------------------------. -| Set the USER_TOKEN_NUMBER associated to SYMBOL. | -`-------------------------------------------------*/ +/*------------------------------------------------. +| Set the USER_TOKEN_NUMBER associated with SYM. | +`------------------------------------------------*/ void -symbol_user_token_number_set (symbol_t *symbol, int user_token_number) +symbol_user_token_number_set (symbol *sym, int user_token_number, location loc) { - assert (symbol->class == token_sym); + if (sym->class != token_sym) + abort (); - if (symbol->user_token_number != USER_NUMBER_UNDEFINED) - complain (_("redefining user token number of %s"), symbol->tag); + 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); - symbol->user_token_number = user_token_number; - /* User defined EOF token? */ + sym->user_token_number = user_token_number; + /* User defined $end token? */ if (user_token_number == 0) { - eoftoken = symbol; - eoftoken->number = 0; + endtoken = sym; + endtoken->number = 0; /* It is always mapped to 0, so it was already counted in NTOKENS. */ --ntokens; @@ -131,72 +227,63 @@ symbol_user_token_number_set (symbol_t *symbol, int user_token_number) } -/*------------. -| Free THIS. | -`------------*/ +/*----------------------------------------------------------. +| If SYM is not defined, report an error, and consider it a | +| nonterminal. | +`----------------------------------------------------------*/ -static void -symbol_free (symbol_t *this) +static inline bool +symbol_check_defined (symbol *sym) { -#if 0 - /* This causes crashes because one string can appear more - than once. */ - XFREE (this->type_name); -#endif - XFREE (this->tag); - XFREE (this); -} - + 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++; + } -/*-----------------------------------------------------------. -| If THIS is not defined, report an error, and consider it a | -| nonterminal. | -`-----------------------------------------------------------*/ + return true; +} static bool -symbol_check_defined (symbol_t *this) +symbol_check_defined_processor (void *sym, void *null ATTRIBUTE_UNUSED) { - if (this->class == unknown_sym) - { - complain - (_("symbol %s is used, but is not defined as a token and has no rules"), - this->tag); - this->class = nterm_sym; - this->number = nvars++; - } - - return TRUE; + return symbol_check_defined (sym); } -/*-------------------------------------------------------------------. -| Declare the new SYMBOL. Make it an alias of SYMVAL, and type them | -| with TYPENAME. | -`-------------------------------------------------------------------*/ +/*------------------------------------------------------------------. +| Declare the new symbol SYM. Make it an alias of SYMVAL, and type | +| SYMVAL with SYM's type. | +`------------------------------------------------------------------*/ void -symbol_make_alias (symbol_t *symbol, symbol_t *symval, char *typename) +symbol_make_alias (symbol *sym, symbol *symval, location loc) { if (symval->alias) - warn (_("symbol `%s' used more than once as a literal string"), - symval->tag); - else if (symbol->alias) - warn (_("symbol `%s' given more than one literal string"), - symbol->tag); + warn_at (loc, _("symbol `%s' used more than once as a literal string"), + symval->tag); + else if (sym->alias) + warn_at (loc, _("symbol `%s' given more than one literal string"), + sym->tag); else { symval->class = token_sym; - symval->type_name = typename; - symval->user_token_number = symbol->user_token_number; - symbol->user_token_number = USER_NUMBER_ALIAS; - symval->alias = symbol; - symbol->alias = symval; - /* symbol and symval combined are only one symbol */ + 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--; - assert (ntokens == symbol->number || ntokens == symval->number); - symbol->number = symval->number = - (symval->number < symbol->number) ? symval->number : symbol->number; + 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); } } @@ -206,35 +293,60 @@ symbol_make_alias (symbol_t *symbol, symbol_t *symval, char *typename) | associativity. | `---------------------------------------------------------*/ -static bool -symbol_check_alias_consistence (symbol_t *this) +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 *alias = this; + symbol *orig = this->alias; + + /* Check only those that _are_ the aliases. */ + if (!(this->alias && this->user_token_number == USER_NUMBER_ALIAS)) + return; + + if (orig->type_name != alias->type_name) { - if (this->prec != this->alias->prec) - { - if (this->prec != 0 && this->alias->prec != 0) - complain (_("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 (orig->type_name) + symbol_type_set (alias, orig->type_name, orig->type_location); + else + symbol_type_set (orig, alias->type_name, alias->type_location); + } - if (this->assoc != this->alias->assoc) - { - if (this->assoc != 0 && this->alias->assoc != 0) - complain (_("conflicting assoc values for %s and %s"), - this->tag, this->alias->tag); - if (this->assoc != 0) - this->alias->assoc = this->assoc; - else - this->assoc = this->alias->assoc; - } + + if (orig->destructor || alias->destructor) + { + if (orig->destructor) + symbol_destructor_set (alias, orig->destructor, + orig->destructor_location); + else + symbol_destructor_set (orig, alias->destructor, + alias->destructor_location); + } + + if (orig->printer || alias->printer) + { + if (orig->printer) + symbol_printer_set (alias, orig->printer, orig->printer_location); + else + symbol_printer_set (orig, alias->printer, alias->printer_location); } - return TRUE; + + if (alias->prec || orig->prec) + { + if (orig->prec) + symbol_precedence_set (alias, orig->prec, orig->assoc, + orig->prec_location); + else + symbol_precedence_set (orig, alias->prec, alias->assoc, + alias->prec_location); + } +} + +static bool +symbol_check_alias_consistency_processor (void *this, + void *null ATTRIBUTE_UNUSED) +{ + symbol_check_alias_consistency (this); + return true; } @@ -243,8 +355,8 @@ symbol_check_alias_consistence (symbol_t *this) | into FDEFINES. Put in SYMBOLS. | `-------------------------------------------------------------------*/ -static bool -symbol_pack (symbol_t *this) +static inline bool +symbol_pack (symbol *this) { if (this->class == nterm_sym) { @@ -257,25 +369,33 @@ symbol_pack (symbol_t *this) prec and assoc fields and make both the same */ if (this->number == NUMBER_UNDEFINED) { - if (this == eoftoken || this->alias == eoftoken) + if (this == endtoken || this->alias == endtoken) this->number = this->alias->number = 0; else { - assert (this->alias->number != NUMBER_UNDEFINED); + if (this->alias->number == NUMBER_UNDEFINED) + abort (); this->number = this->alias->number; } } - /* Do not do processing below for USER_NUMBER_ALIASs. */ + /* Do not do processing below for USER_NUMBER_ALIASes. */ if (this->user_token_number == USER_NUMBER_ALIAS) - return TRUE; + return true; } else /* this->class == token_sym */ { - assert (this->number != NUMBER_UNDEFINED); + if (this->number == NUMBER_UNDEFINED) + abort (); } symbols[this->number] = this; - return TRUE; + return true; +} + +static bool +symbol_pack_processor (void *this, void *null ATTRIBUTE_UNUSED) +{ + return symbol_pack (this); } @@ -285,8 +405,8 @@ symbol_pack (symbol_t *this) | Put THIS in TOKEN_TRANSLATIONS if it is a token. | `--------------------------------------------------*/ -static bool -symbol_translation (symbol_t *this) +static inline bool +symbol_translation (symbol *this) { /* Non-terminal? */ if (this->class == token_sym @@ -294,14 +414,21 @@ symbol_translation (symbol_t *this) { /* A token which translation has already been set? */ if (token_translations[this->user_token_number] != undeftoken->number) - complain (_("tokens %s and %s both assigned number %d"), - symbols[token_translations[this->user_token_number]]->tag, - this->tag, this->user_token_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); token_translations[this->user_token_number] = this->number; } - return TRUE; + return true; +} + +static bool +symbol_translation_processor (void *this, void *null ATTRIBUTE_UNUSED) +{ + return symbol_translation (this); } @@ -314,16 +441,30 @@ symbol_translation (symbol_t *this) static struct hash_table *symbol_table = NULL; +static inline bool +hash_compare_symbol (const symbol *m1, const symbol *m2) +{ + /* Since tags are unique, we can compare the pointers themselves. */ + return UNIQSTR_EQ (m1->tag, m2->tag); +} + static bool -hash_compare_symbol_t (const symbol_t *m1, const symbol_t *m2) +hash_symbol_comparator (void const *m1, void const *m2) { - return strcmp (m1->tag, m2->tag) ? FALSE : TRUE; + return hash_compare_symbol (m1, m2); } -static unsigned int -hash_symbol_t (const symbol_t *m, unsigned int tablesize) +static inline size_t +hash_symbol (const symbol *m, size_t tablesize) { - return hash_string (m->tag, tablesize); + /* Since tags 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); } @@ -336,9 +477,9 @@ symbols_new (void) { symbol_table = hash_initialize (HT_INITIAL_CAPACITY, NULL, - (Hash_hasher) hash_symbol_t, - (Hash_comparator) hash_compare_symbol_t, - (Hash_data_freer) symbol_free); + hash_symbol_hasher, + hash_symbol_comparator, + free); } @@ -347,25 +488,48 @@ symbols_new (void) | yet, create it. | `----------------------------------------------------------------*/ -symbol_t * -getsym (const char *key) +symbol * +symbol_get (const char *key, location loc) { - symbol_t probe; - symbol_t *entry; + symbol probe; + symbol *entry; - (const char *) probe.tag = key; + key = uniqstr_new (key); + probe.tag = key; entry = hash_lookup (symbol_table, &probe); if (!entry) { /* First insertion in the hash. */ - entry = symbol_new (key); + entry = symbol_new (key, loc); hash_insert (symbol_table, entry); } return entry; } +/*------------------------------------------------------------------. +| Generate a dummy nonterminal, whose name cannot conflict with the | +| user's names. | +`------------------------------------------------------------------*/ + +symbol * +dummy_symbol_get (location loc) +{ + /* Incremented for each generated symbol. */ + static int dummy_count = 0; + static char buf[256]; + + symbol *sym; + + sprintf (buf, "@%d", ++dummy_count); + sym = symbol_get (buf, loc); + sym->class = nterm_sym; + sym->number = nvars++; + return sym; +} + + /*-------------------. | Free the symbols. | `-------------------*/ @@ -374,6 +538,7 @@ void symbols_free (void) { hash_free (symbol_table); + free (symbols); } @@ -382,12 +547,10 @@ symbols_free (void) | terminals. | `---------------------------------------------------------------*/ -void -symbols_do (symbol_processor processor, void *processor_data) +static void +symbols_do (Hash_processor processor, void *processor_data) { - hash_do_for_each (symbol_table, - (Hash_processor) processor, - processor_data); + hash_do_for_each (symbol_table, processor, processor_data); } @@ -399,7 +562,7 @@ symbols_do (symbol_processor processor, void *processor_data) void symbols_check_defined (void) { - symbols_do (symbol_check_defined, NULL); + symbols_do (symbol_check_defined_processor, NULL); } /*------------------------------------------------------------------. @@ -410,7 +573,7 @@ symbols_check_defined (void) static void symbols_token_translations_init (void) { - int num_256_available_p = TRUE; + bool num_256_available_p = true; int i; /* Find the highest user token number, and whether 256, the POSIX @@ -418,13 +581,13 @@ symbols_token_translations_init (void) max_user_token_number = 0; for (i = 0; i < ntokens; ++i) { - symbol_t *this = symbols[i]; + 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; + num_256_available_p = false; } } @@ -439,21 +602,22 @@ symbols_token_translations_init (void) for (i = 0; i < ntokens; ++i) { - symbol_t *this = symbols[i]; + symbol *this = symbols[i]; if (this->user_token_number == USER_NUMBER_UNDEFINED) 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; } - token_translations = XCALLOC (symbol_number_t, 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. */ + 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, NULL); + symbols_do (symbol_translation_processor, NULL); } @@ -465,15 +629,19 @@ symbols_token_translations_init (void) void symbols_pack (void) { - symbols = XCALLOC (symbol_t *, nsyms); + symbols = xcalloc (nsyms, sizeof *symbols); - symbols_do (symbol_check_alias_consistence, NULL); - symbols_do (symbol_pack, NULL); + symbols_do (symbol_check_alias_consistency_processor, NULL); + symbols_do (symbol_pack_processor, NULL); symbols_token_translations_init (); if (startsymbol->class == unknown_sym) - fatal (_("the start symbol %s is undefined"), startsymbol->tag); + fatal_at (startsymbol_location, + _("the start symbol %s is undefined"), + startsymbol->tag); else if (startsymbol->class == token_sym) - fatal (_("the start symbol %s is a token"), startsymbol->tag); + fatal_at (startsymbol_location, + _("the start symbol %s is a token"), + startsymbol->tag); }