X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/40675e7cc90b44d3c82c424946ea55083eb78121..21fe08cadcb84fddd5038ac6857a904dbe1ad885:/src/symtab.c diff --git a/src/symtab.c b/src/symtab.c index adfe3901..4470f3a1 100644 --- a/src/symtab.c +++ b/src/symtab.c @@ -1,150 +1,953 @@ -/* Symbol table manager for Bison, - Copyright (C) 1984, 1989 Free Software Foundation, Inc. +/* Symbol table manager for Bison. -This file is part of Bison, the GNU Compiler Compiler. + Copyright (C) 1984, 1989, 2000, 2001, 2002, 2004, 2005, 2006 Free + Software Foundation, Inc. -Bison 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. + This file is part of Bison, the GNU Compiler Compiler. -Bison 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. + Bison 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. -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, 675 Mass Ave, Cambridge, MA 02139, USA. */ + Bison 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., 51 Franklin Street, Fifth Floor, + Boston, MA 02110-1301, USA. */ -#include +#include #include "system.h" -#include "new.h" -#include "symtab.h" + +#include +#include + +#include "complain.h" #include "gram.h" +#include "symtab.h" + +/*------------------------. +| Distinguished symbols. | +`------------------------*/ + +symbol *errtoken = NULL; +symbol *undeftoken = NULL; +symbol *endtoken = NULL; +symbol *accept = NULL; +symbol *startsymbol = NULL; +location startsymbol_location; + +/*-----------------------------------. +| Default %destructor and %printer. | +`-----------------------------------*/ + +static const char *default_destructor = NULL; +static location default_destructor_location; +static const char *default_printer = NULL; +static location default_printer_location; + +/*---------------------------------. +| Create a new symbol, named TAG. | +`---------------------------------*/ + +static symbol * +symbol_new (uniqstr tag, location loc) +{ + symbol *res = xmalloc (sizeof *res); + + uniqstr_assert (tag); + res->tag = tag; + res->location = loc; + + res->type_name = NULL; + res->destructor = NULL; + res->printer = NULL; + + res->number = NUMBER_UNDEFINED; + res->prec = 0; + res->assoc = undef_assoc; + res->user_token_number = USER_NUMBER_UNDEFINED; + + res->alias = NULL; + res->class = unknown_sym; + res->declared = false; + + if (nsyms == SYMBOL_NUMBER_MAXIMUM) + fatal (_("too many symbols in input grammar (limit is %d)"), + SYMBOL_NUMBER_MAXIMUM); + nsyms++; + return res; +} + +/*----------------------------------------. +| Create a new semantic type, named TAG. | +`----------------------------------------*/ + +static semantic_type * +semantic_type_new (uniqstr tag) +{ + semantic_type *res = xmalloc (sizeof *res); + + uniqstr_assert (tag); + res->tag = tag; + res->destructor = NULL; + res->printer = NULL; + + return res; +} + + +/*-----------------. +| 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) +{ + if (s) + { + fprintf (f, "\"%s\"", s->tag); + SYMBOL_ATTR_PRINT (type_name); + SYMBOL_ATTR_PRINT (destructor); + SYMBOL_ATTR_PRINT (printer); + } + else + fprintf (f, ""); +} + +#undef SYMBOL_ATTR_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. Do nothing if passed 0. | +`------------------------------------------------------------------*/ + +void +symbol_destructor_set (symbol *sym, const char *destructor, location loc) +{ + if (destructor) + { + if (sym->destructor) + symbol_redeclaration (sym, "%destructor", sym->destructor_location, + loc); + sym->destructor = destructor; + sym->destructor_location = loc; + } +} + +/*-------------------------------------------------------------------. +| Set the DESTRUCTOR associated with TYPE. Do nothing if passed 0. | +`-------------------------------------------------------------------*/ + +void +semantic_type_destructor_set (semantic_type *type, const char *destructor, + location loc) +{ + if (destructor) + { + if (type->destructor) + semantic_type_redeclaration (type, "%destructor", + type->destructor_location, loc); + type->destructor = destructor; + type->destructor_location = loc; + } +} + +/*---------------------------------------. +| Get the computed %destructor for SYM. | +`---------------------------------------*/ + +const char * +symbol_destructor_get (symbol *sym) +{ + /* Per-symbol %destructor. */ + if (sym->destructor != NULL) + return sym->destructor; + + /* Per-type %destructor. */ + if (sym->type_name) + { + semantic_type *type = semantic_type_get (sym->type_name); + if (type->destructor) + return type->destructor; + } + + /* Apply the default %destructor only to user-defined symbols. */ + if (sym->tag[0] == '$' || sym == errtoken) + return NULL; + return default_destructor; +} + +/*---------------------------------------------------------------. +| Get the grammar location of the %destructor computed for SYM. | +`---------------------------------------------------------------*/ + +location +symbol_destructor_location_get (symbol *sym) +{ + if (sym->destructor != NULL) + return sym->destructor_location; + if (sym->type_name) + { + semantic_type *type = semantic_type_get (sym->type_name); + if (type->destructor) + return type->destructor_location; + } + return default_destructor_location; +} +/*---------------------------------------------------------------. +| Set the PRINTER associated with SYM. Do nothing if passed 0. | +`---------------------------------------------------------------*/ -bucket **symtab; -bucket *firstsymbol; -bucket *lastsymbol; +void +symbol_printer_set (symbol *sym, const char *printer, location loc) +{ + if (printer) + { + if (sym->printer) + symbol_redeclaration (sym, "%printer", sym->printer_location, loc); + sym->printer = printer; + sym->printer_location = loc; + } +} +/*----------------------------------------------------------------. +| Set the PRINTER associated with TYPE. Do nothing if passed 0. | +`----------------------------------------------------------------*/ + +void +semantic_type_printer_set (semantic_type *type, const char *printer, + location loc) +{ + if (printer) + { + if (type->printer) + semantic_type_redeclaration (type, "%printer", type->printer_location, + loc); + type->printer = printer; + type->printer_location = loc; + } +} +/*------------------------------------. +| Get the computed %printer for SYM. | +`------------------------------------*/ -int -hash(key) -char *key; +const char * +symbol_printer_get (symbol *sym) { - register char *cp; - register int k; + /* Per-symbol %printer. */ + if (sym->printer != NULL) + return sym->printer; - cp = key; - k = 0; - while (*cp) - k = ((k << 1) ^ (*cp++)) & 0x3fff; + /* Per-type %printer. */ + if (sym->type_name) + { + semantic_type *type = semantic_type_get (sym->type_name); + if (type->printer) + return type->printer; + } - return (k % TABSIZE); + /* Apply the default %printer only to user-defined symbols. */ + if (sym->tag[0] == '$' || sym == errtoken) + return NULL; + return default_printer; } +/*------------------------------------------------------------. +| Get the grammar location of the %printer computed for SYM. | +`------------------------------------------------------------*/ +location +symbol_printer_location_get (symbol *sym) +{ + if (sym->printer != NULL) + return sym->printer_location; + if (sym->type_name) + { + semantic_type *type = semantic_type_get (sym->type_name); + if (type->printer) + return type->printer_location; + } + return default_printer_location; +} + + +/*-----------------------------------------------------------------. +| Set the PRECEDENCE associated with SYM. Does nothing if invoked | +| with UNDEF_ASSOC as ASSOC. | +`-----------------------------------------------------------------*/ -char * -copys(s) -char *s; +void +symbol_precedence_set (symbol *sym, int prec, assoc a, location loc) { - register int i; - register char *cp; - register char *result; + 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); +} + - i = 1; - for (cp = s; *cp; cp++) - i++; +/*------------------------------------. +| Set the CLASS associated with SYM. | +`------------------------------------*/ - result = xmalloc((unsigned int)i); - strcpy(result, s); - return (result); +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 -tabinit() +symbol_user_token_number_set (symbol *sym, int user_token_number, location loc) { -/* register int i; JF unused */ + int *user_token_numberp; + + assert (sym->class == token_sym); - symtab = NEW2(TABSIZE, bucket *); + 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); - firstsymbol = NULL; - lastsymbol = NULL; + *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; + } } -bucket * -getsym(key) -char *key; +/*----------------------------------------------------------. +| 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) { - register int hashval; - register bucket *bp; - register int found; + return symbol_check_defined (sym); +} + - hashval = hash(key); - bp = symtab[hashval]; +/*------------------------------------------------------------------. +| Declare the new symbol SYM. Make it an alias of SYMVAL, and type | +| SYMVAL with SYM's type. | +`------------------------------------------------------------------*/ - found = 0; - while (bp != NULL && found == 0) +void +symbol_make_alias (symbol *sym, symbol *symval, location loc) +{ + if (symval->alias) + 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 { - if (strcmp(key, bp->tag) == 0) - found = 1; + 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; + symval->number = sym->number; + symbol_type_set (symval, 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 *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 (orig->type_name) + symbol_type_set (alias, orig->type_name, orig->type_location); else - bp = bp->link; + symbol_type_set (orig, alias->type_name, alias->type_location); } - if (found == 0) + + if (orig->destructor || alias->destructor) { - nsyms++; + if (orig->destructor) + symbol_destructor_set (alias, orig->destructor, + orig->destructor_location); + else + symbol_destructor_set (orig, alias->destructor, + alias->destructor_location); + } - bp = NEW(bucket); - bp->link = symtab[hashval]; - bp->next = NULL; - bp->tag = copys(key); - bp->class = SUNKNOWN; + 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); + } - if (firstsymbol == NULL) - { - firstsymbol = bp; - lastsymbol = bp; - } + 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; +} + + +/*-------------------------------------------------------------------. +| Assign a symbol number, and write the definition of the token name | +| into FDEFINES. Put in SYMBOLS. | +`-------------------------------------------------------------------*/ + +static inline bool +symbol_pack (symbol *this) +{ + 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) { - lastsymbol->next = bp; - lastsymbol = bp; + if (this == endtoken || this->alias == endtoken) + this->number = this->alias->number = 0; + else + { + assert (this->alias->number != NUMBER_UNDEFINED); + 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 */ + assert (this->number != NUMBER_UNDEFINED); + + symbols[this->number] = this; + return true; +} + +static bool +symbol_pack_processor (void *this, void *null ATTRIBUTE_UNUSED) +{ + return symbol_pack (this); +} + - symtab[hashval] = bp; + + +/*--------------------------------------------------. +| 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_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); + + token_translations[this->user_token_number] = this->number; } - return (bp); + 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) +{ + /* Since tags are unique, we can compare the pointers themselves. */ + 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) +{ + /* Since tags are unique, we can hash the pointer itself. */ + 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. | +`-------------------------------*/ void -free_symtab() +symbols_new (void) { - register int i; - register bucket *bp,*bptmp;/* JF don't use ptr after free */ + symbol_table = hash_initialize (HT_INITIAL_CAPACITY, + 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); +} + - for (i = 0; i < TABSIZE; i++) +/*----------------------------------------------------------------. +| Find the symbol named KEY, and return it. If it does not exist | +| yet, create it. | +`----------------------------------------------------------------*/ + +symbol * +symbol_from_uniqstr (const uniqstr key, location loc) +{ + symbol probe; + symbol *entry; + + probe.tag = key; + entry = hash_lookup (symbol_table, &probe); + + if (!entry) { - bp = symtab[i]; - while (bp) + /* First insertion in the hash. */ + entry = symbol_new (key, loc); + hash_insert (symbol_table, entry); + } + 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) +{ + 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); + hash_insert (semantic_type_table, entry); + } + 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) +{ + return semantic_type_from_uniqstr (uniqstr_new (key)); +} + + +/*------------------------------------------------------------------. +| 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; +} + +bool +symbol_is_dummy (const symbol *sym) +{ + return sym->tag[0] == '@'; +} + +/*-------------------. +| Free the symbols. | +`-------------------*/ + +void +symbols_free (void) +{ + hash_free (symbol_table); + hash_free (semantic_type_table); + free (symbols); +} + + +/*---------------------------------------------------------------. +| Look for undefined symbols, report an error, and consider them | +| terminals. | +`---------------------------------------------------------------*/ + +static void +symbols_do (Hash_processor processor, void *processor_data) +{ + hash_do_for_each (symbol_table, processor, processor_data); +} + + +/*--------------------------------------------------------------. +| Check that all the symbols are defined. Report any undefined | +| symbols and consider them nonterminals. | +`--------------------------------------------------------------*/ + +void +symbols_check_defined (void) +{ + symbols_do (symbol_check_defined_processor, NULL); +} + +/*------------------------------------------------------------------. +| Set TOKEN_TRANSLATIONS. Check that no two symbols share the same | +| number. | +`------------------------------------------------------------------*/ + +static void +symbols_token_translations_init (void) +{ + bool num_256_available_p = true; + int i; + + /* Find the highest user token number, and whether 256, the POSIX + preferred user token number for the error token, is used. */ + max_user_token_number = 0; + for (i = 0; i < ntokens; ++i) + { + symbol *this = symbols[i]; + if (this->user_token_number != USER_NUMBER_UNDEFINED) { - bptmp = bp->link; -#if 0 /* This causes crashes because one string can appear more than once. */ - if (bp->type_name) - FREE(bp->type_name); -#endif - FREE(bp); - bp = bptmp; + 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; } } - FREE(symtab); + + /* If 256 is not used, assign it to error, to follow POSIX. */ + if (num_256_available_p + && errtoken->user_token_number == USER_NUMBER_UNDEFINED) + errtoken->user_token_number = 256; + + /* Set the missing user numbers. */ + if (max_user_token_number < 256) + max_user_token_number = 256; + + for (i = 0; i < ntokens; ++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 = 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. + */ + for (i = 0; i < max_user_token_number + 1; i++) + token_translations[i] = undeftoken->number; + symbols_do (symbol_translation_processor, NULL); +} + + +/*----------------------------------------------------------------. +| Assign symbol numbers, and write definition of token names into | +| FDEFINES. Set up vectors SYMBOL_TABLE, TAGS of symbols. | +`----------------------------------------------------------------*/ + +void +symbols_pack (void) +{ + symbols_do (symbol_check_alias_consistency_processor, NULL); + + symbols = xcalloc (nsyms, sizeof *symbols); + symbols_do (symbol_pack_processor, NULL); + + /* 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); + else if (startsymbol->class == token_sym) + fatal_at (startsymbol_location, + _("the start symbol %s is a token"), + startsymbol->tag); +} + + +/*-----------------------------------. +| Set default %destructor/%printer. | +`-----------------------------------*/ + +void +default_destructor_set (const char *destructor, location loc) +{ + if (default_destructor != NULL) + { + complain_at (loc, _("redeclaration for default %%destructor")); + complain_at (default_destructor_location, _("previous declaration")); + } + default_destructor = destructor; + default_destructor_location = loc; +} + +void +default_printer_set (const char *printer, location loc) +{ + if (default_printer != NULL) + { + complain_at (loc, _("redeclaration for default %%printer")); + complain_at (default_printer_location, _("previous declaration")); + } + default_printer = printer; + default_printer_location = loc; }