X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/76290368d48b584808a120dfbd415be93aef04f6..a68b1f237e63c96ee905916424013f79d01908ba:/src/symtab.c?ds=inline diff --git a/src/symtab.c b/src/symtab.c index 81a938ce..002f6e37 100644 --- a/src/symtab.c +++ b/src/symtab.c @@ -1,35 +1,39 @@ /* Symbol table manager for Bison. - Copyright (C) 1984, 1989, 2000, 2001, 2002, 2004, 2005, 2006 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. - 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., 51 Franklin Street, Fifth Floor, - Boston, MA 02110-1301, USA. */ + along with this program. If not, see . */ #include #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. | `------------------------*/ @@ -60,6 +64,13 @@ symbol_new (uniqstr tag, location loc) symbol *res = xmalloc (sizeof *res); uniqstr_assert (tag); + + /* If the tag is not a string (starts with a double quote), check + that it is valid for Yacc. */ + if (tag[0] != '\"' && tag[0] != '\'' && mbschr (tag, '-')) + yacc_at (loc, _("POSIX Yacc forbids dashes in symbol names: %s"), + tag); + res->tag = tag; res->location = loc; @@ -109,9 +120,9 @@ semantic_type_new (uniqstr tag) if (s->Attr) \ fprintf (f, " %s { %s }", #Attr, s->Attr) -#define SYMBOL_CODE_PRINT(Attr) \ - if (code_props_code_get (s->Attr)) \ - fprintf (f, " %s { %s }", #Attr, code_props_code_get(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) @@ -152,6 +163,7 @@ semantic_type_redeclaration (semantic_type *s, const char *what, location first, } + /*-----------------------------------------------------------------. | Set the TYPE_NAME associated with SYM. Does nothing if passed 0 | | as TYPE_NAME. | @@ -170,19 +182,17 @@ symbol_type_set (symbol *sym, uniqstr type_name, location loc) } } - /*-----------------------------------------. | Set the DESTRUCTOR associated with SYM. | `-----------------------------------------*/ void -symbol_destructor_set (symbol *sym, code_props destructor) +symbol_destructor_set (symbol *sym, code_props const *destructor) { - if (code_props_code_get (sym->destructor)) - symbol_redeclaration (sym, "%destructor", - code_props_location_get (sym->destructor), - code_props_location_get (destructor)); - sym->destructor = destructor; + if (sym->destructor.code) + symbol_redeclaration (sym, "%destructor", sym->destructor.location, + destructor->location); + sym->destructor = *destructor; } /*------------------------------------------. @@ -190,41 +200,43 @@ symbol_destructor_set (symbol *sym, code_props destructor) `------------------------------------------*/ void -semantic_type_destructor_set (semantic_type *type, code_props destructor) +semantic_type_destructor_set (semantic_type *type, + code_props const *destructor) { - if (code_props_code_get (type->destructor)) + if (type->destructor.code) semantic_type_redeclaration (type, "%destructor", - code_props_location_get (type->destructor), - code_props_location_get (destructor)); - type->destructor = destructor; + type->destructor.location, + destructor->location); + type->destructor = *destructor; } /*---------------------------------------. | Get the computed %destructor for SYM. | `---------------------------------------*/ -code_props -symbol_destructor_get (symbol *sym) +code_props const * +symbol_destructor_get (symbol const *sym) { /* Per-symbol %destructor. */ - if (code_props_code_get (sym->destructor)) - return sym->destructor; + if (sym->destructor.code) + return &sym->destructor; /* Per-type %destructor. */ if (sym->type_name) { - code_props destructor = semantic_type_get (sym->type_name)->destructor; - if (code_props_code_get (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; + return &code_props_none; if (sym->type_name) - return default_tagged_destructor; - return default_tagless_destructor; + return &default_tagged_destructor; + return &default_tagless_destructor; } /*--------------------------------------. @@ -232,13 +244,12 @@ symbol_destructor_get (symbol *sym) `--------------------------------------*/ void -symbol_printer_set (symbol *sym, code_props printer) +symbol_printer_set (symbol *sym, code_props const *printer) { - if (code_props_code_get (sym->printer)) + if (sym->printer.code) symbol_redeclaration (sym, "%printer", - code_props_location_get (sym->printer), - code_props_location_get (printer)); - sym->printer = printer; + sym->printer.location, printer->location); + sym->printer = *printer; } /*---------------------------------------. @@ -246,41 +257,40 @@ symbol_printer_set (symbol *sym, code_props printer) `---------------------------------------*/ void -semantic_type_printer_set (semantic_type *type, code_props printer) +semantic_type_printer_set (semantic_type *type, code_props const *printer) { - if (code_props_code_get (type->printer)) + if (type->printer.code) semantic_type_redeclaration (type, "%printer", - code_props_location_get (type->printer), - code_props_location_get (printer)); - type->printer = printer; + type->printer.location, printer->location); + type->printer = *printer; } /*------------------------------------. | Get the computed %printer for SYM. | `------------------------------------*/ -code_props -symbol_printer_get (symbol *sym) +code_props const * +symbol_printer_get (symbol const *sym) { /* Per-symbol %printer. */ - if (code_props_code_get (sym->printer)) - return sym->printer; + if (sym->printer.code) + return &sym->printer; /* Per-type %printer. */ if (sym->type_name) { - code_props printer = semantic_type_get (sym->type_name)->printer; - if (code_props_code_get (printer)) + 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; + return &code_props_none; if (sym->type_name) - return default_tagged_printer; - return default_tagless_printer; + return &default_tagged_printer; + return &default_tagless_printer; } /*-----------------------------------------------------------------. @@ -344,9 +354,7 @@ symbol_user_token_number_set (symbol *sym, int user_token_number, location loc) { int *user_token_numberp; - aver (sym->class == token_sym); - - 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; @@ -359,10 +367,11 @@ 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; + if (endtoken->number != NUMBER_UNDEFINED) + --ntokens; + endtoken->number = 0; } } @@ -395,29 +404,24 @@ 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); } } @@ -430,48 +434,47 @@ 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 (code_props_code_get (orig->destructor) - || code_props_code_get (alias->destructor)) + if (str->destructor.code || sym->destructor.code) { - if (code_props_code_get (orig->destructor)) - 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 (code_props_code_get (orig->printer) - || code_props_code_get (alias->printer)) + if (str->printer.code || sym->printer.code) { - if (code_props_code_get (orig->printer)) - 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); } } @@ -492,31 +495,11 @@ 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; @@ -529,7 +512,26 @@ symbol_pack_processor (void *this, void *null ATTRIBUTE_UNUSED) } +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 traversal of the symbol table sorted on tag. + However, error messages make more sense if we keep the first + declaration first. */ + if (location_cmp (first->location, second->location) > 0) + { + symbol* tmp = first; + first = second; + second = tmp; + } + complain_at (second->location, + _("user token number %d redeclaration for %s"), + num, second->tag); + complain_at (first->location, _("previous declaration for %s"), + first->tag); +} /*--------------------------------------------------. | Put THIS in TOKEN_TRANSLATIONS if it is a token. | @@ -540,14 +542,14 @@ 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) - 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); + user_token_number_redeclaration + (this->user_token_number, + symbols[token_translations[this->user_token_number]], + this); token_translations[this->user_token_number] = this->number; } @@ -661,8 +663,10 @@ 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; } @@ -686,7 +690,8 @@ 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; } @@ -753,6 +758,7 @@ symbols_free (void) hash_free (symbol_table); hash_free (semantic_type_table); free (symbols); + free (symbols_sorted); } @@ -761,13 +767,36 @@ 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. | @@ -890,54 +919,53 @@ symbols_pack (void) `--------------------------------------------------*/ void -default_tagged_destructor_set (code_props destructor) +default_tagged_destructor_set (code_props const *destructor) { - if (code_props_code_get (default_tagged_destructor)) + if (default_tagged_destructor.code) { - complain_at (code_props_location_get (destructor), + complain_at (destructor->location, _("redeclaration for default tagged %%destructor")); - complain_at (code_props_location_get (default_tagged_destructor), + complain_at (default_tagged_destructor.location, _("previous declaration")); } - default_tagged_destructor = destructor; + default_tagged_destructor = *destructor; } void -default_tagless_destructor_set (code_props destructor) +default_tagless_destructor_set (code_props const *destructor) { - if (code_props_code_get (default_tagless_destructor)) + if (default_tagless_destructor.code) { - complain_at (code_props_location_get (destructor), + complain_at (destructor->location, _("redeclaration for default tagless %%destructor")); - complain_at (code_props_location_get (default_tagless_destructor), + complain_at (default_tagless_destructor.location, _("previous declaration")); } - default_tagless_destructor = destructor; + default_tagless_destructor = *destructor; } void -default_tagged_printer_set (code_props printer) +default_tagged_printer_set (code_props const *printer) { - if (code_props_code_get (default_tagged_printer)) + if (default_tagged_printer.code) { - complain_at (code_props_location_get (printer), + complain_at (printer->location, _("redeclaration for default tagged %%printer")); - complain_at (code_props_location_get (default_tagged_printer), + complain_at (default_tagged_printer.location, _("previous declaration")); } - default_tagged_printer = printer; + default_tagged_printer = *printer; } void -default_tagless_printer_set (code_props printer) +default_tagless_printer_set (code_props const *printer) { - if (code_props_code_get (default_tagless_printer)) + if (default_tagless_printer.code) { - complain_at (code_props_location_get (printer), + complain_at (printer->location, _("redeclaration for default tagless %%printer")); - complain_at (code_props_location_get (default_tagless_printer), + complain_at (default_tagless_printer.location, _("previous declaration")); } - default_tagless_printer = printer; + default_tagless_printer = *printer; } -