X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/527203e98e6c57e185ac4308631cc6286edb13d1..41930e7ad89f9a889b1c00fbd2842dded01ada1a:/src/symtab.c?ds=sidebyside diff --git a/src/symtab.c b/src/symtab.c index 53c9f677..1db83f63 100644 --- a/src/symtab.c +++ b/src/symtab.c @@ -1,25 +1,24 @@ /* Symbol table manager for Bison. - Copyright (C) 1984, 1989, 2000, 2001, 2002 Free Software Foundation, Inc. + Copyright (C) 1984, 1989, 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2008 + 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 . */ +#include #include "system.h" #include @@ -40,6 +39,15 @@ 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. | `---------------------------------*/ @@ -47,15 +55,15 @@ location startsymbol_location; static symbol * symbol_new (uniqstr tag, location loc) { - symbol *res = MALLOC (res, 1); + symbol *res = xmalloc (sizeof *res); uniqstr_assert (tag); res->tag = tag; 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; @@ -64,11 +72,83 @@ 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)"), + 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; + 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 | +| 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 | @@ -81,48 +161,141 @@ symbol_type_set (symbol *sym, uniqstr type_name, location loc) 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; } } +/*-----------------------------------. +| Get the CLASS associated with SYM. | +`-----------------------------------*/ -/*------------------------------------------------------------------. -| Set the DESTRUCTOR associated with SYM. Do nothing if passed 0. | -`------------------------------------------------------------------*/ +const char * +symbol_class_get_string (symbol *sym) +{ + if (sym->class) + { + if (sym->class == token_sym) + return "terminal"; + else if (sym->class == nterm_sym) + return "nonterminal"; + } + return "unknown"; +} + + +/*-----------------------------------------. +| 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 (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) +{ + /* Per-symbol %destructor. */ + if (sym->destructor.code) + return &sym->destructor; + + /* Per-type %destructor. */ + if (sym->type_name) { - if (sym->destructor) - complain_at (loc, _("%s redeclaration for %s"), - "%destructor", sym->tag); - 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] == '$' || sym == errtoken) + return &code_props_none; + + if (sym->type_name) + return &default_tagged_destructor; + return &default_tagless_destructor; } +/*--------------------------------------. +| Set the PRINTER associated with SYM. | +`--------------------------------------*/ -/*---------------------------------------------------------------. -| Set the PRINTER associated with SYM. Do nothing if passed 0. | -`---------------------------------------------------------------*/ +void +symbol_printer_set (symbol *sym, code_props const *printer) +{ + if (sym->printer.code) + symbol_redeclaration (sym, "%printer", + sym->printer.location, printer->location); + sym->printer = *printer; +} + +/*---------------------------------------. +| Set the PRINTER associated with TYPE. | +`---------------------------------------*/ void -symbol_printer_set (symbol *sym, char *printer, location loc) +semantic_type_printer_set (semantic_type *type, code_props const *printer) +{ + if (type->printer.code) + semantic_type_redeclaration (type, "%printer", + type->printer.location, printer->location); + type->printer = *printer; +} + +/*------------------------------------. +| Get the computed %printer for SYM. | +`------------------------------------*/ + +code_props const * +symbol_printer_get (symbol const *sym) { - if (printer) + /* Per-symbol %printer. */ + if (sym->printer.code) + return &sym->printer; + + /* Per-type %printer. */ + if (sym->type_name) { - if (sym->printer) - complain_at (loc, _("%s redeclaration for %s"), - "%printer", sym->tag); - sym->printer = printer; - sym->printer_location = loc; + code_props const *printer = &semantic_type_get (sym->type_name)->printer; + if (printer->code) + return printer; } -} + /* Apply the default %printer only to user-defined symbols. */ + if (sym->tag[0] == '$' || 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 | @@ -135,13 +308,15 @@ symbol_precedence_set (symbol *sym, int prec, assoc a, location loc) 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); } @@ -150,10 +325,13 @@ 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++; @@ -161,6 +339,13 @@ 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; + } } @@ -171,14 +356,17 @@ 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) + 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) { @@ -229,10 +417,10 @@ 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); + symval->tag); else if (sym->alias) warn_at (loc, _("symbol `%s' given more than one literal string"), - sym->tag); + sym->tag); else { symval->class = token_sym; @@ -240,13 +428,7 @@ 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); } } @@ -257,45 +439,58 @@ symbol_make_alias (symbol *sym, symbol *symval, location 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 *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_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 (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 != 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 (orig->destructor.code || alias->destructor.code) + { + if (orig->destructor.code) + symbol_destructor_set (alias, &orig->destructor); + else + symbol_destructor_set (orig, &alias->destructor); + } + + if (orig->printer.code || alias->printer.code) + { + if (orig->printer.code) + symbol_printer_set (alias, &orig->printer); + else + symbol_printer_set (orig, &alias->printer); + } + + 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); } - return true; } static bool symbol_check_alias_consistency_processor (void *this, void *null ATTRIBUTE_UNUSED) { - return symbol_check_alias_consistency (this); + symbol_check_alias_consistency (this); + return true; } @@ -322,8 +517,7 @@ 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; } } @@ -332,10 +526,7 @@ 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; @@ -381,14 +572,15 @@ 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) @@ -397,25 +589,50 @@ 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 inline unsigned int -hash_symbol (const symbol *m, unsigned int tablesize) +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 unsigned int -hash_symbol_hasher (void const *m, unsigned int 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. | @@ -429,6 +646,11 @@ 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); } @@ -438,13 +660,11 @@ symbols_new (void) `----------------------------------------------------------------*/ 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); @@ -458,6 +678,54 @@ 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. | @@ -472,13 +740,18 @@ 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. | @@ -488,6 +761,7 @@ void symbols_free (void) { hash_free (symbol_table); + hash_free (semantic_type_table); free (symbols); } @@ -559,7 +833,8 @@ symbols_token_translations_init (void) 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. @@ -578,11 +853,35 @@ symbols_token_translations_init (void) void symbols_pack (void) { - CALLOC (symbols, nsyms); - 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) @@ -594,3 +893,60 @@ 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; +}