X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/12cf133f348392750f808bec0d188bac58bff2bd..4896ede89ca060e3673e90fcd4a36f76517905c7:/src/symtab.c diff --git a/src/symtab.c b/src/symtab.c index e68e473b..d25b9368 100644 --- a/src/symtab.c +++ b/src/symtab.c @@ -1,8 +1,7 @@ /* Symbol table manager for Bison. - Copyright (C) 1984, 1989, 2000, 2001, 2002, 2004, 2005, 2006, 2007, - 2008, 2009 - Free Software Foundation, Inc. + Copyright (C) 1984, 1989, 2000-2002, 2004-2012 Free Software + Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -23,12 +22,18 @@ #include "system.h" #include -#include #include "complain.h" #include "gram.h" #include "symtab.h" +/*-------------------------------------------------------------------. +| Symbols sorted by tag. Allocated by the first invocation of | +| symbols_do, after which no more symbols should be created. | +`-------------------------------------------------------------------*/ + +static symbol **symbols_sorted = NULL; + /*------------------------. | Distinguished symbols. | `------------------------*/ @@ -84,7 +89,7 @@ symbol_new (uniqstr tag, location loc) if (nsyms == SYMBOL_NUMBER_MAXIMUM) fatal (_("too many symbols in input grammar (limit is %d)"), - SYMBOL_NUMBER_MAXIMUM); + SYMBOL_NUMBER_MAXIMUM); nsyms++; return res; } @@ -111,8 +116,8 @@ semantic_type_new (uniqstr tag) | Print a symbol. | `-----------------*/ -#define SYMBOL_ATTR_PRINT(Attr) \ - if (s->Attr) \ +#define SYMBOL_ATTR_PRINT(Attr) \ + if (s->Attr) \ fprintf (f, " %s { %s }", #Attr, s->Attr) #define SYMBOL_CODE_PRINT(Attr) \ @@ -164,7 +169,7 @@ is_identifier (uniqstr s) uniqstr symbol_id_get (symbol const *sym) { - aver (sym->user_token_number != USER_NUMBER_ALIAS); + aver (sym->user_token_number != USER_NUMBER_HAS_STRING_ALIAS); if (sym->alias) sym = sym->alias; return is_identifier (sym->tag) ? sym->tag : 0; @@ -205,31 +210,13 @@ 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); + 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. | -`-----------------------------------*/ - -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. | `-----------------------------------------*/ @@ -352,7 +339,7 @@ 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, + symbol_redeclaration (sym, assoc_to_string (a), sym->prec_location, loc); sym->prec = prec; sym->assoc = a; @@ -387,7 +374,7 @@ symbol_class_set (symbol *sym, symbol_class class, location loc, bool declaring) if (declaring) { if (sym->declared) - warn_at (loc, _("symbol %s redeclared"), sym->tag); + warn_at (loc, _("symbol %s redeclared"), sym->tag); sym->declared = true; } } @@ -402,7 +389,7 @@ symbol_user_token_number_set (symbol *sym, int user_token_number, location loc) { int *user_token_numberp; - if (sym->user_token_number != USER_NUMBER_ALIAS) + if (sym->user_token_number != USER_NUMBER_HAS_STRING_ALIAS) user_token_numberp = &sym->user_token_number; else user_token_numberp = &sym->alias->user_token_number; @@ -415,10 +402,11 @@ symbol_user_token_number_set (symbol *sym, int user_token_number, location loc) if (user_token_number == 0) { endtoken = sym; - endtoken->number = 0; /* It is always mapped to 0, so it was already counted in - NTOKENS. */ - --ntokens; + NTOKENS. */ + if (endtoken->number != NUMBER_UNDEFINED) + --ntokens; + endtoken->number = 0; } } @@ -434,9 +422,9 @@ 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->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++; } @@ -451,29 +439,24 @@ symbol_check_defined_processor (void *sym, void *null ATTRIBUTE_UNUSED) } -/*------------------------------------------------------------------. -| Declare the new symbol SYM. Make it an alias of SYMVAL, and type | -| SYMVAL with SYM's type. | -`------------------------------------------------------------------*/ - void -symbol_make_alias (symbol *sym, symbol *symval, location loc) +symbol_make_alias (symbol *sym, symbol *str, location loc) { - if (symval->alias) - warn_at (loc, _("symbol `%s' used more than once as a literal string"), - symval->tag); + if (str->alias) + warn_at (loc, _("symbol %s used more than once as a literal string"), + str->tag); else if (sym->alias) - warn_at (loc, _("symbol `%s' given more than one literal string"), - sym->tag); + warn_at (loc, _("symbol %s given more than one literal string"), + sym->tag); else { - 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); + str->class = token_sym; + str->user_token_number = sym->user_token_number; + sym->user_token_number = USER_NUMBER_HAS_STRING_ALIAS; + str->alias = sym; + sym->alias = str; + str->number = sym->number; + symbol_type_set (str, sym->type_name, loc); } } @@ -486,52 +469,53 @@ symbol_make_alias (symbol *sym, symbol *symval, location loc) static inline void symbol_check_alias_consistency (symbol *this) { - symbol *alias = this; - symbol *orig = this->alias; + symbol *sym = this; + symbol *str = this->alias; - /* Check only those that _are_ the aliases. */ - if (!(this->alias && this->user_token_number == USER_NUMBER_ALIAS)) + /* Check only the symbol in the symbol-string pair. */ + if (!(this->alias + && this->user_token_number == USER_NUMBER_HAS_STRING_ALIAS)) return; - if (orig->type_name != alias->type_name) + if (str->type_name != sym->type_name) { - if (orig->type_name) - symbol_type_set (alias, orig->type_name, orig->type_location); + if (str->type_name) + symbol_type_set (sym, str->type_name, str->type_location); else - symbol_type_set (orig, alias->type_name, alias->type_location); + symbol_type_set (str, sym->type_name, sym->type_location); } - if (orig->destructor.code || alias->destructor.code) + if (str->destructor.code || sym->destructor.code) { - if (orig->destructor.code) - symbol_destructor_set (alias, &orig->destructor); + if (str->destructor.code) + symbol_destructor_set (sym, &str->destructor); else - symbol_destructor_set (orig, &alias->destructor); + symbol_destructor_set (str, &sym->destructor); } - if (orig->printer.code || alias->printer.code) + if (str->printer.code || sym->printer.code) { - if (orig->printer.code) - symbol_printer_set (alias, &orig->printer); + if (str->printer.code) + symbol_printer_set (sym, &str->printer); else - symbol_printer_set (orig, &alias->printer); + symbol_printer_set (str, &sym->printer); } - if (alias->prec || orig->prec) + if (sym->prec || str->prec) { - if (orig->prec) - symbol_precedence_set (alias, orig->prec, orig->assoc, - orig->prec_location); + if (str->prec) + symbol_precedence_set (sym, str->prec, str->assoc, + str->prec_location); else - symbol_precedence_set (orig, alias->prec, alias->assoc, - alias->prec_location); + symbol_precedence_set (str, sym->prec, sym->assoc, + sym->prec_location); } } static bool symbol_check_alias_consistency_processor (void *this, - void *null ATTRIBUTE_UNUSED) + void *null ATTRIBUTE_UNUSED) { symbol_check_alias_consistency (this); return true; @@ -546,31 +530,11 @@ symbol_check_alias_consistency_processor (void *this, static inline bool symbol_pack (symbol *this) { + aver (this->number != NUMBER_UNDEFINED); 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) - { - if (this == endtoken || this->alias == endtoken) - this->number = this->alias->number = 0; - else - { - aver (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 */ - aver (this->number != NUMBER_UNDEFINED); + this->number += ntokens; + else if (this->user_token_number == USER_NUMBER_HAS_STRING_ALIAS) + return true; symbols[this->number] = this; return true; @@ -587,10 +551,10 @@ static void user_token_number_redeclaration (int num, symbol *first, symbol *second) { /* User token numbers are not assigned during the parsing, but in a - second step, via a (nondeterministic) traversal of the symbol - hash table. + second step, via a traversal of the symbol table sorted on tag. - Make errors deterministic: keep the first declaration first. */ + However, error messages make more sense if we keep the first + declaration first. */ if (location_cmp (first->location, second->location) > 0) { symbol* tmp = first; @@ -613,11 +577,11 @@ symbol_translation (symbol *this) { /* Non-terminal? */ if (this->class == token_sym - && this->user_token_number != USER_NUMBER_ALIAS) + && this->user_token_number != USER_NUMBER_HAS_STRING_ALIAS) { /* A token which translation has already been set? */ if (token_translations[this->user_token_number] != undeftoken->number) - user_token_number_redeclaration + user_token_number_redeclaration (this->user_token_number, symbols[token_translations[this->user_token_number]], this); @@ -705,15 +669,15 @@ void symbols_new (void) { symbol_table = hash_initialize (HT_INITIAL_CAPACITY, - NULL, - hash_symbol_hasher, - hash_symbol_comparator, - free); + 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); + NULL, + hash_semantic_type_hasher, + hash_semantic_type_comparator, + free); } @@ -734,8 +698,10 @@ symbol_from_uniqstr (const uniqstr key, location loc) if (!entry) { /* First insertion in the hash. */ + aver (!symbols_sorted); entry = symbol_new (key, loc); - hash_insert (symbol_table, entry); + if (!hash_insert (symbol_table, entry)) + xalloc_die (); } return entry; } @@ -759,7 +725,8 @@ semantic_type_from_uniqstr (const uniqstr key) { /* First insertion in the hash. */ entry = semantic_type_new (key); - hash_insert (semantic_type_table, entry); + if (!hash_insert (semantic_type_table, entry)) + xalloc_die (); } return entry; } @@ -826,6 +793,7 @@ symbols_free (void) hash_free (symbol_table); hash_free (semantic_type_table); free (symbols); + free (symbols_sorted); } @@ -834,13 +802,36 @@ symbols_free (void) | terminals. | `---------------------------------------------------------------*/ +static int +symbols_cmp (symbol const *a, symbol const *b) +{ + return strcmp (a->tag, b->tag); +} + +static int +symbols_cmp_qsort (void const *a, void const *b) +{ + return symbols_cmp (*(symbol * const *)a, *(symbol * const *)b); +} + static void symbols_do (Hash_processor processor, void *processor_data) { - hash_do_for_each (symbol_table, processor, processor_data); + size_t count = hash_get_n_entries (symbol_table); + if (!symbols_sorted) + { + symbols_sorted = xnmalloc (count, sizeof *symbols_sorted); + hash_get_entries (symbol_table, (void**)symbols_sorted, count); + qsort (symbols_sorted, count, sizeof *symbols_sorted, + symbols_cmp_qsort); + } + { + size_t i; + for (i = 0; i < count; ++i) + processor (symbols_sorted[i], processor_data); + } } - /*--------------------------------------------------------------. | Check that all the symbols are defined. Report any undefined | | symbols and consider them nonterminals. | @@ -870,12 +861,12 @@ symbols_token_translations_init (void) { 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; - } + { + 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; + } } /* If 256 is not used, assign it to error, to follow POSIX. */ @@ -891,13 +882,13 @@ symbols_token_translations_init (void) { symbol *this = symbols[i]; if (this->user_token_number == USER_NUMBER_UNDEFINED) - this->user_token_number = ++max_user_token_number; + 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; + max_user_token_number = this->user_token_number; } token_translations = xnmalloc (max_user_token_number + 1, - sizeof *token_translations); + sizeof *token_translations); /* Initialize all entries for literal tokens to the internal token number for $undefined, which represents all invalid inputs. */ @@ -948,12 +939,12 @@ symbols_pack (void) if (startsymbol->class == unknown_sym) fatal_at (startsymbol_location, - _("the start symbol %s is undefined"), - startsymbol->tag); + _("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); + _("the start symbol %s is a token"), + startsymbol->tag); } @@ -969,7 +960,7 @@ default_tagged_destructor_set (code_props const *destructor) complain_at (destructor->location, _("redeclaration for default tagged %%destructor")); complain_at (default_tagged_destructor.location, - _("previous declaration")); + _("previous declaration")); } default_tagged_destructor = *destructor; } @@ -982,7 +973,7 @@ default_tagless_destructor_set (code_props const *destructor) complain_at (destructor->location, _("redeclaration for default tagless %%destructor")); complain_at (default_tagless_destructor.location, - _("previous declaration")); + _("previous declaration")); } default_tagless_destructor = *destructor; } @@ -995,7 +986,7 @@ default_tagged_printer_set (code_props const *printer) complain_at (printer->location, _("redeclaration for default tagged %%printer")); complain_at (default_tagged_printer.location, - _("previous declaration")); + _("previous declaration")); } default_tagged_printer = *printer; } @@ -1008,7 +999,7 @@ default_tagless_printer_set (code_props const *printer) complain_at (printer->location, _("redeclaration for default tagless %%printer")); complain_at (default_tagless_printer.location, - _("previous declaration")); + _("previous declaration")); } default_tagless_printer = *printer; }