X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/ca407bdf9db2d435ca1a4a257b158632d1cb4842..0049ec8628e5a320d055a0cea8676a58cec60986:/src/symtab.c?ds=sidebyside diff --git a/src/symtab.c b/src/symtab.c index 3b5683a2..8910f09c 100644 --- a/src/symtab.c +++ b/src/symtab.c @@ -1,7 +1,7 @@ /* Symbol table manager for Bison. - Copyright (C) 1984, 1989, 2000, 2001, 2002, 2004, 2005 Free Software - Foundation, Inc. + Copyright (C) 1984, 1989, 2000, 2001, 2002, 2004, 2005, 2006, 2007 Free + Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -17,10 +17,10 @@ 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 #include "system.h" #include @@ -41,6 +41,15 @@ symbol *accept = NULL; symbol *startsymbol = NULL; location startsymbol_location; +/*---------------------------------------. +| Default %destructor's and %printer's. | +`---------------------------------------*/ + +static code_props default_tagged_destructor = CODE_PROPS_NONE_INIT; +static code_props default_tagless_destructor = CODE_PROPS_NONE_INIT; +static code_props default_tagged_printer = CODE_PROPS_NONE_INIT; +static code_props default_tagless_printer = CODE_PROPS_NONE_INIT; + /*---------------------------------. | Create a new symbol, named TAG. | `---------------------------------*/ @@ -55,8 +64,8 @@ symbol_new (uniqstr tag, location loc) res->location = loc; res->type_name = NULL; - res->destructor = NULL; - res->printer = NULL; + code_props_none_init (&res->destructor); + code_props_none_init (&res->printer); res->number = NUMBER_UNDEFINED; res->prec = 0; @@ -65,6 +74,7 @@ symbol_new (uniqstr tag, location loc) 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)"), @@ -73,6 +83,52 @@ symbol_new (uniqstr tag, location loc) 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; + code_props_none_init (&res->destructor); + code_props_none_init (&res->printer); + + 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->Attr.code) \ + fprintf (f, " %s { %s }", #Attr, s->Attr.code) + +void +symbol_print (symbol *s, FILE *f) +{ + if (s) + { + fprintf (f, "\"%s\"", s->tag); + SYMBOL_ATTR_PRINT (type_name); + SYMBOL_CODE_PRINT (destructor); + SYMBOL_CODE_PRINT (printer); + } + else + fprintf (f, ""); +} + +#undef SYMBOL_ATTR_PRINT +#undef SYMBOL_CODE_PRINT /*------------------------------------------------------------------. | Complain that S's WHAT is redeclared at SECOND, and was first set | @@ -80,10 +136,19 @@ symbol_new (uniqstr tag, location loc) `------------------------------------------------------------------*/ static void -redeclaration (symbol* s, const char *what, location first, location second) +symbol_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")); + 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")); } @@ -98,7 +163,7 @@ symbol_type_set (symbol *sym, uniqstr type_name, location loc) if (type_name) { if (sym->type_name) - redeclaration (sym, "%type", sym->type_location, loc); + symbol_redeclaration (sym, "%type", sym->type_location, loc); uniqstr_assert (type_name); sym->type_name = type_name; sym->type_location = loc; @@ -106,39 +171,116 @@ symbol_type_set (symbol *sym, uniqstr type_name, location loc) } -/*------------------------------------------------------------------. -| Set the DESTRUCTOR associated with SYM. Do nothing if passed 0. | -`------------------------------------------------------------------*/ +/*-----------------------------------------. +| Set the DESTRUCTOR associated with SYM. | +`-----------------------------------------*/ void -symbol_destructor_set (symbol *sym, char *destructor, location loc) +symbol_destructor_set (symbol *sym, code_props const *destructor) +{ + if (sym->destructor.code) + symbol_redeclaration (sym, "%destructor", sym->destructor.location, + destructor->location); + sym->destructor = *destructor; +} + +/*------------------------------------------. +| Set the DESTRUCTOR associated with TYPE. | +`------------------------------------------*/ + +void +semantic_type_destructor_set (semantic_type *type, + code_props const *destructor) +{ + if (type->destructor.code) + semantic_type_redeclaration (type, "%destructor", + type->destructor.location, + destructor->location); + type->destructor = *destructor; +} + +/*---------------------------------------. +| Get the computed %destructor for SYM. | +`---------------------------------------*/ + +code_props const * +symbol_destructor_get (symbol const *sym) { - if (destructor) + /* Per-symbol %destructor. */ + if (sym->destructor.code) + return &sym->destructor; + + /* Per-type %destructor. */ + if (sym->type_name) { - if (sym->destructor) - redeclaration (sym, "%destructor", sym->destructor_location, loc); - sym->destructor = destructor; - sym->destructor_location = loc; + code_props const *destructor = + &semantic_type_get (sym->type_name)->destructor; + if (destructor->code) + return destructor; } + + /* Apply default %destructor's only to user-defined symbols. */ + if (sym->tag[0] == '$' || sym == errtoken) + return &code_props_none; + + if (sym->type_name) + return &default_tagged_destructor; + return &default_tagless_destructor; } +/*--------------------------------------. +| Set the PRINTER associated with SYM. | +`--------------------------------------*/ -/*---------------------------------------------------------------. -| Set the PRINTER associated with SYM. Do nothing if passed 0. | -`---------------------------------------------------------------*/ +void +symbol_printer_set (symbol *sym, code_props const *printer) +{ + if (sym->printer.code) + symbol_redeclaration (sym, "%printer", + sym->printer.location, printer->location); + sym->printer = *printer; +} + +/*---------------------------------------. +| Set the PRINTER associated with TYPE. | +`---------------------------------------*/ void -symbol_printer_set (symbol *sym, char *printer, location loc) +semantic_type_printer_set (semantic_type *type, code_props const *printer) { - if (printer) + if (type->printer.code) + semantic_type_redeclaration (type, "%printer", + type->printer.location, printer->location); + type->printer = *printer; +} + +/*------------------------------------. +| Get the computed %printer for SYM. | +`------------------------------------*/ + +code_props const * +symbol_printer_get (symbol const *sym) +{ + /* Per-symbol %printer. */ + if (sym->printer.code) + return &sym->printer; + + /* Per-type %printer. */ + if (sym->type_name) { - if (sym->printer) - redeclaration (sym, "%printer", sym->destructor_location, loc); - sym->printer = printer; - sym->printer_location = loc; + code_props const *printer = &semantic_type_get (sym->type_name)->printer; + if (printer->code) + return printer; } -} + /* Apply the default %printer only to user-defined symbols. */ + if (sym->tag[0] == '$' || sym == errtoken) + return &code_props_none; + + if (sym->type_name) + return &default_tagged_printer; + return &default_tagless_printer; +} /*-----------------------------------------------------------------. | Set the PRECEDENCE associated with SYM. Does nothing if invoked | @@ -151,14 +293,15 @@ symbol_precedence_set (symbol *sym, int prec, assoc a, location loc) if (a != undef_assoc) { if (sym->prec != 0) - redeclaration (sym, assoc_to_string (a), sym->prec_location, loc); + 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); } @@ -167,10 +310,13 @@ symbol_precedence_set (symbol *sym, int prec, assoc a, location loc) `------------------------------------*/ void -symbol_class_set (symbol *sym, symbol_class class, location loc) +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); + { + complain_at (loc, _("symbol %s redefined"), sym->tag); + sym->declared = false; + } if (class == nterm_sym && sym->class != nterm_sym) sym->number = nvars++; @@ -178,6 +324,13 @@ symbol_class_set (symbol *sym, symbol_class class, location loc) sym->number = ntokens++; sym->class = class; + + if (declaring) + { + if (sym->declared) + warn_at (loc, _("symbol %s redeclared"), sym->tag); + sym->declared = true; + } } @@ -188,14 +341,19 @@ symbol_class_set (symbol *sym, symbol_class class, location loc) 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) + aver (sym->class == token_sym); + + 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); - sym->user_token_number = user_token_number; + *user_token_numberp = user_token_number; /* User defined $end token? */ if (user_token_number == 0) { @@ -257,13 +415,7 @@ symbol_make_alias (symbol *sym, symbol *symval, location loc) 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; + symval->number = sym->number; symbol_type_set (symval, sym->type_name, loc); } } @@ -293,22 +445,20 @@ symbol_check_alias_consistency (symbol *this) } - if (orig->destructor || alias->destructor) + if (orig->destructor.code || alias->destructor.code) { - if (orig->destructor) - symbol_destructor_set (alias, orig->destructor, - orig->destructor_location); + if (orig->destructor.code) + symbol_destructor_set (alias, &orig->destructor); else - symbol_destructor_set (orig, alias->destructor, - alias->destructor_location); + symbol_destructor_set (orig, &alias->destructor); } - if (orig->printer || alias->printer) + if (orig->printer.code || alias->printer.code) { - if (orig->printer) - symbol_printer_set (alias, orig->printer, orig->printer_location); + if (orig->printer.code) + symbol_printer_set (alias, &orig->printer); else - symbol_printer_set (orig, alias->printer, alias->printer_location); + symbol_printer_set (orig, &alias->printer); } if (alias->prec || orig->prec) @@ -354,8 +504,7 @@ symbol_pack (symbol *this) this->number = this->alias->number = 0; else { - if (this->alias->number == NUMBER_UNDEFINED) - abort (); + aver (this->alias->number != NUMBER_UNDEFINED); this->number = this->alias->number; } } @@ -364,10 +513,7 @@ symbol_pack (symbol *this) return true; } else /* this->class == token_sym */ - { - if (this->number == NUMBER_UNDEFINED) - abort (); - } + aver (this->number != NUMBER_UNDEFINED); symbols[this->number] = this; return true; @@ -413,14 +559,15 @@ symbol_translation_processor (void *this, void *null ATTRIBUTE_UNUSED) } -/*----------------------. -| 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) @@ -429,12 +576,25 @@ 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) { @@ -442,12 +602,24 @@ 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. | @@ -461,6 +633,11 @@ symbols_new (void) 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); } @@ -470,12 +647,11 @@ symbols_new (void) `----------------------------------------------------------------*/ symbol * -symbol_get (const char *key, location loc) +symbol_from_uniqstr (const uniqstr key, location loc) { symbol probe; symbol *entry; - key = uniqstr_new (key); probe.tag = key; entry = hash_lookup (symbol_table, &probe); @@ -489,6 +665,54 @@ symbol_get (const char *key, location loc) } +/*-----------------------------------------------------------------------. +| 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. | @@ -503,13 +727,18 @@ dummy_symbol_get (location loc) 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. | @@ -519,6 +748,7 @@ void symbols_free (void) { hash_free (symbol_table); + hash_free (semantic_type_table); free (symbols); } @@ -610,11 +840,35 @@ symbols_token_translations_init (void) void symbols_pack (void) { - symbols = xcalloc (nsyms, sizeof *symbols); - 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) @@ -626,3 +880,61 @@ symbols_pack (void) _("the start symbol %s is a token"), startsymbol->tag); } + + +/*--------------------------------------------------. +| Set default tagged/tagless %destructor/%printer. | +`--------------------------------------------------*/ + +void +default_tagged_destructor_set (code_props const *destructor) +{ + if (default_tagged_destructor.code) + { + complain_at (destructor->location, + _("redeclaration for default tagged %%destructor")); + complain_at (default_tagged_destructor.location, + _("previous declaration")); + } + default_tagged_destructor = *destructor; +} + +void +default_tagless_destructor_set (code_props const *destructor) +{ + if (default_tagless_destructor.code) + { + complain_at (destructor->location, + _("redeclaration for default tagless %%destructor")); + complain_at (default_tagless_destructor.location, + _("previous declaration")); + } + default_tagless_destructor = *destructor; +} + +void +default_tagged_printer_set (code_props const *printer) +{ + if (default_tagged_printer.code) + { + complain_at (printer->location, + _("redeclaration for default tagged %%printer")); + complain_at (default_tagged_printer.location, + _("previous declaration")); + } + default_tagged_printer = *printer; +} + +void +default_tagless_printer_set (code_props const *printer) +{ + if (default_tagless_printer.code) + { + complain_at (printer->location, + _("redeclaration for default tagless %%printer")); + complain_at (default_tagless_printer.location, + _("previous declaration")); + } + default_tagless_printer = *printer; +} +