X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/9280d3ef893b90b36c89fa7737512f2d640e41d9..eb1b07409f0ccad9970c8a60ded9f2a56d205b9c:/src/symtab.c?ds=inline diff --git a/src/symtab.c b/src/symtab.c index 0d8e1f49..8910f09c 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, 2006, 2007 Free + Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -15,188 +17,348 @@ 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 "quotearg.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; -location_t startsymbol_location; +symbol *errtoken = NULL; +symbol *undeftoken = NULL; +symbol *endtoken = NULL; +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. | `---------------------------------*/ -static symbol_t * -symbol_new (const char *tag, location_t location) +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->location = location; + code_props_none_init (&res->destructor); + code_props_none_init (&res->printer); + 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; + 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. | +`----------------------------------------*/ -/*-----------------------------------------------------------------. -| Return the tag of this SYMBOL in a printable form. Warning: use | -| the first QUOTEARG slot: 0. | -`-----------------------------------------------------------------*/ - -const char * -symbol_tag_get (symbol_t *symbol) +static semantic_type * +semantic_type_new (uniqstr tag) { - return quotearg_style (escape_quoting_style, symbol->tag); -} - + semantic_type *res = xmalloc (sizeof *res); -/*------------------------------------------------------------. -| Return the tag of this SYMBOL in a printable form. Use the | -| QUOTEARG slot number N. | -`------------------------------------------------------------*/ + uniqstr_assert (tag); + res->tag = tag; + code_props_none_init (&res->destructor); + code_props_none_init (&res->printer); -const char * -symbol_tag_get_n (symbol_t *symbol, int n) -{ - return quotearg_n_style (n, escape_quoting_style, symbol->tag); + return res; } -/*-------------------------------. -| Print the tag of this SYMBOL. | -`-------------------------------*/ +/*-----------------. +| 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_tag_print (symbol_t *symbol, FILE *out) +symbol_print (symbol *s, FILE *f) { - fputs (symbol_tag_get (symbol), out); + 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 /*------------------------------------------------------------------. -| Set the TYPE_NAME associated to SYMBOL. Does nothing if passed 0 | -| as TYPE_NAME. | +| 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_t *symbol, location_t location, char *type_name) +symbol_type_set (symbol *sym, uniqstr type_name, location loc) { if (type_name) { - if (symbol->type_name) - complain_at (location, - _("type redeclaration for %s"), symbol_tag_get (symbol)); - symbol->type_name = 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 to SYMBOL. Does nothing if passed 0 | -| as DESTRUCTOR. | -`-------------------------------------------------------------------*/ +/*-----------------------------------------. +| Set the DESTRUCTOR associated with SYM. | +`-----------------------------------------*/ void -symbol_destructor_set (symbol_t *symbol, location_t location, char *destructor) +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 (symbol->destructor) - complain_at (location, - _("destructor redeclaration for %s"), - symbol_tag_get (symbol)); - symbol->destructor = destructor; + 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] == '$' || sym == errtoken) + return &code_props_none; + + if (sym->type_name) + return &default_tagged_destructor; + return &default_tagless_destructor; } +/*--------------------------------------. +| Set the PRINTER associated with SYM. | +`--------------------------------------*/ -/*------------------------------------------------------------------. -| Set the PRECEDENCE associated to SYMBOL. Does nothing if invoked | -| with UNDEF_ASSOC as ASSOC. | -`------------------------------------------------------------------*/ +void +symbol_printer_set (symbol *sym, code_props const *printer) +{ + if (sym->printer.code) + symbol_redeclaration (sym, "%printer", + sym->printer.location, printer->location); + sym->printer = *printer; +} + +/*---------------------------------------. +| Set the PRINTER associated with TYPE. | +`---------------------------------------*/ void -symbol_precedence_set (symbol_t *symbol, location_t location, - int prec, associativity assoc) +semantic_type_printer_set (semantic_type *type, code_props const *printer) +{ + if (type->printer.code) + semantic_type_redeclaration (type, "%printer", + type->printer.location, printer->location); + type->printer = *printer; +} + +/*------------------------------------. +| Get the computed %printer for SYM. | +`------------------------------------*/ + +code_props const * +symbol_printer_get (symbol const *sym) { - if (assoc != undef_assoc) + /* Per-symbol %printer. */ + if (sym->printer.code) + return &sym->printer; + + /* Per-type %printer. */ + if (sym->type_name) { - if (symbol->prec != 0) - complain_at (location, - _("redefining precedence of %s"), - symbol_tag_get (symbol)); - symbol->prec = prec; - symbol->assoc = assoc; + code_props const *printer = &semantic_type_get (sym->type_name)->printer; + if (printer->code) + return printer; + } + + /* Apply the default %printer only to user-defined symbols. */ + if (sym->tag[0] == '$' || 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 | +| with UNDEF_ASSOC as ASSOC. | +`-----------------------------------------------------------------*/ + +void +symbol_precedence_set (symbol *sym, int prec, assoc a, location loc) +{ + 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 (symbol, token_sym); + symbol_class_set (sym, token_sym, loc, false); } -/*-------------------------------------. -| 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, bool declaring) { - if (symbol->class != unknown_sym && symbol->class != class) - complain (_("symbol %s redefined"), symbol_tag_get (symbol)); + if (sym->class != unknown_sym && sym->class != class) + { + complain_at (loc, _("symbol %s redefined"), sym->tag); + sym->declared = false; + } - 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; + + if (declaring) + { + if (sym->declared) + warn_at (loc, _("symbol %s redeclared"), sym->tag); + sym->declared = true; + } } -/*-------------------------------------------------. -| 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); + int *user_token_numberp; - if (symbol->user_token_number != USER_NUMBER_UNDEFINED - && symbol->user_token_number != user_token_number) - complain (_("redefining user token number of %s"), - symbol_tag_get (symbol)); + aver (sym->class == token_sym); - symbol->user_token_number = user_token_number; - /* User defined EOF token? */ + 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); + + *user_token_numberp = 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; @@ -204,72 +366,57 @@ symbol_user_token_number_set (symbol_t *symbol, int user_token_number) } -/*------------. -| Free THIS. | -`------------*/ - -static void -symbol_free (symbol_t *this) -{ -#if 0 - /* This causes crashes because one string can appear more - than once. */ - XFREE (this->type_name); -#endif - XFREE (this->tag); - XFREE (this); -} - - -/*-----------------------------------------------------------. -| If THIS is not defined, report an error, and consider it a | -| nonterminal. | -`-----------------------------------------------------------*/ +/*----------------------------------------------------------. +| If SYM is not defined, report an error, and consider it a | +| nonterminal. | +`----------------------------------------------------------*/ -static bool -symbol_check_defined (symbol_t *this) +static inline bool +symbol_check_defined (symbol *sym) { - if (this->class == unknown_sym) + if (sym->class == unknown_sym) { complain_at - (this->location, + (sym->location, _("symbol %s is used, but is not defined as a token and has no rules"), - symbol_tag_get (this)); - this->class = nterm_sym; - this->number = nvars++; + sym->tag); + sym->class = nterm_sym; + sym->number = nvars++; } - return TRUE; + return true; +} + +static bool +symbol_check_defined_processor (void *sym, void *null ATTRIBUTE_UNUSED) +{ + 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) +symbol_make_alias (symbol *sym, symbol *symval, location loc) { if (symval->alias) - warn (_("symbol `%s' used more than once as a literal string"), - symbol_tag_get (symval)); - else if (symbol->alias) - warn (_("symbol `%s' given more than one literal string"), - symbol_tag_get (symbol)); + 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->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 */ - nsyms--; - ntokens--; - assert (ntokens == symbol->number || ntokens == symval->number); - symbol->number = symval->number = - (symval->number < symbol->number) ? symval->number : symbol->number; + 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); } } @@ -279,39 +426,58 @@ symbol_make_alias (symbol_t *symbol, symbol_t *symval) | 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"), - symbol_tag_get (this), symbol_tag_get (this->alias)); - 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) - { - /* FIXME: For some reason (probably the S/R => keep the S), - the right assoc is chosen has the ``not set''. This is - not nice, fix this! */ - if (this->assoc != right_assoc - && this->alias->assoc != right_assoc) - complain (_("conflicting associativities for %s and %s"), - symbol_tag_get (this), symbol_tag_get (this->alias)); - if (this->assoc != 0) - 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); } - 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; } @@ -320,8 +486,8 @@ 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) { @@ -334,25 +500,29 @@ 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); + aver (this->alias->number != NUMBER_UNDEFINED); 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); - } + aver (this->number != NUMBER_UNDEFINED); symbols[this->number] = this; - return TRUE; + return true; +} + +static bool +symbol_pack_processor (void *this, void *null ATTRIBUTE_UNUSED) +{ + return symbol_pack (this); } @@ -362,8 +532,8 @@ 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 @@ -371,38 +541,85 @@ 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"), - symbol_tag_get (symbols[token_translations[this->user_token_number]]), - symbol_tag_get (this), 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); } -/*----------------------. -| 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) +{ + /* 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_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 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) { - return hash_string (m->tag, 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. | @@ -413,9 +630,14 @@ 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); + semantic_type_table = hash_initialize (HT_INITIAL_CAPACITY, + NULL, + hash_semantic_type_hasher, + hash_semantic_type_comparator, + free); } @@ -424,25 +646,100 @@ symbols_new (void) | yet, create it. | `----------------------------------------------------------------*/ -symbol_t * -getsym (const char *key, location_t location) +symbol * +symbol_from_uniqstr (const uniqstr key, location loc) { - symbol_t probe; - symbol_t *entry; + symbol probe; + symbol *entry; - (const char *) probe.tag = key; + probe.tag = key; entry = hash_lookup (symbol_table, &probe); if (!entry) { /* First insertion in the hash. */ - entry = symbol_new (key, location); + 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] == '@' || (sym->tag[0] == '$' && sym->tag[1] == '@'); +} + /*-------------------. | Free the symbols. | `-------------------*/ @@ -451,6 +748,8 @@ void symbols_free (void) { hash_free (symbol_table); + hash_free (semantic_type_table); + free (symbols); } @@ -459,12 +758,10 @@ 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); } @@ -476,7 +773,7 @@ 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); } /*------------------------------------------------------------------. @@ -487,7 +784,7 @@ 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 @@ -495,13 +792,13 @@ 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; } } @@ -516,21 +813,22 @@ 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); } @@ -542,19 +840,101 @@ symbols_token_translations_init (void) void symbols_pack (void) { - symbols = XCALLOC (symbol_t *, nsyms); - - symbols_do (symbol_check_alias_consistence, NULL); - symbols_do (symbol_pack, NULL); + 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"), - symbol_tag_get (startsymbol)); + startsymbol->tag); else if (startsymbol->class == token_sym) fatal_at (startsymbol_location, _("the start symbol %s is a token"), - symbol_tag_get (startsymbol)); + 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; +} +