Index: bison/src/bison/2.4.1/bison-2.4.1-src/src/symtab.c |
=================================================================== |
--- bison/src/bison/2.4.1/bison-2.4.1-src/src/symtab.c (revision 0) |
+++ bison/src/bison/2.4.1/bison-2.4.1-src/src/symtab.c (revision 0) |
@@ -0,0 +1,952 @@ |
+/* Symbol table manager for Bison. |
+ |
+ 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. |
+ |
+ 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 3 of the License, or |
+ (at your option) any later version. |
+ |
+ 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 this program. If not, see <http://www.gnu.org/licenses/>. */ |
+ |
+#include <config.h> |
+#include "system.h" |
+ |
+#include <hash.h> |
+#include <quotearg.h> |
+ |
+#include "complain.h" |
+#include "gram.h" |
+#include "symtab.h" |
+ |
+/*------------------------. |
+| Distinguished symbols. | |
+`------------------------*/ |
+ |
+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 * |
+symbol_new (uniqstr tag, location loc) |
+{ |
+ symbol *res = xmalloc (sizeof *res); |
+ |
+ uniqstr_assert (tag); |
+ res->tag = tag; |
+ res->location = loc; |
+ |
+ res->type_name = NULL; |
+ code_props_none_init (&res->destructor); |
+ code_props_none_init (&res->printer); |
+ |
+ res->number = NUMBER_UNDEFINED; |
+ res->prec = 0; |
+ 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. | |
+`----------------------------------------*/ |
+ |
+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, "<NULL>"); |
+} |
+ |
+#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 | |
+| as TYPE_NAME. | |
+`-----------------------------------------------------------------*/ |
+ |
+void |
+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); |
+ 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. | |
+`-----------------------------------------*/ |
+ |
+void |
+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) |
+{ |
+ /* Per-symbol %destructor. */ |
+ if (sym->destructor.code) |
+ return &sym->destructor; |
+ |
+ /* Per-type %destructor. */ |
+ if (sym->type_name) |
+ { |
+ 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] == '$' || sym == errtoken) |
+ return &code_props_none; |
+ |
+ if (sym->type_name) |
+ return &default_tagged_destructor; |
+ return &default_tagless_destructor; |
+} |
+ |
+/*--------------------------------------. |
+| Set the PRINTER associated with SYM. | |
+`--------------------------------------*/ |
+ |
+void |
+symbol_printer_set (symbol *sym, code_props const *printer) |
+{ |
+ if (sym->printer.code) |
+ symbol_redeclaration (sym, "%printer", |
+ sym->printer.location, printer->location); |
+ sym->printer = *printer; |
+} |
+ |
+/*---------------------------------------. |
+| Set the PRINTER associated with TYPE. | |
+`---------------------------------------*/ |
+ |
+void |
+semantic_type_printer_set (semantic_type *type, code_props const *printer) |
+{ |
+ if (type->printer.code) |
+ semantic_type_redeclaration (type, "%printer", |
+ type->printer.location, printer->location); |
+ type->printer = *printer; |
+} |
+ |
+/*------------------------------------. |
+| Get the computed %printer for SYM. | |
+`------------------------------------*/ |
+ |
+code_props const * |
+symbol_printer_get (symbol const *sym) |
+{ |
+ /* Per-symbol %printer. */ |
+ if (sym->printer.code) |
+ return &sym->printer; |
+ |
+ /* Per-type %printer. */ |
+ if (sym->type_name) |
+ { |
+ code_props const *printer = &semantic_type_get (sym->type_name)->printer; |
+ if (printer->code) |
+ return printer; |
+ } |
+ |
+ /* Apply the default %printer only to user-defined symbols. */ |
+ if (sym->tag[0] == '$' || 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 (sym, token_sym, loc, false); |
+} |
+ |
+ |
+/*------------------------------------. |
+| Set the CLASS associated with SYM. | |
+`------------------------------------*/ |
+ |
+void |
+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); |
+ sym->declared = false; |
+ } |
+ |
+ if (class == nterm_sym && sym->class != nterm_sym) |
+ sym->number = nvars++; |
+ else if (class == token_sym && sym->number == NUMBER_UNDEFINED) |
+ sym->number = ntokens++; |
+ |
+ 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 with SYM. | |
+`------------------------------------------------*/ |
+ |
+void |
+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) |
+ 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) |
+ { |
+ endtoken = sym; |
+ endtoken->number = 0; |
+ /* It is always mapped to 0, so it was already counted in |
+ NTOKENS. */ |
+ --ntokens; |
+ } |
+} |
+ |
+ |
+/*----------------------------------------------------------. |
+| If SYM is not defined, report an error, and consider it a | |
+| nonterminal. | |
+`----------------------------------------------------------*/ |
+ |
+static inline bool |
+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->class = nterm_sym; |
+ sym->number = nvars++; |
+ } |
+ |
+ return true; |
+} |
+ |
+static bool |
+symbol_check_defined_processor (void *sym, void *null ATTRIBUTE_UNUSED) |
+{ |
+ return symbol_check_defined (sym); |
+} |
+ |
+ |
+/*------------------------------------------------------------------. |
+| 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) |
+{ |
+ if (symval->alias) |
+ 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 = 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); |
+ } |
+} |
+ |
+ |
+/*---------------------------------------------------------. |
+| Check that THIS, and its alias, have same precedence and | |
+| associativity. | |
+`---------------------------------------------------------*/ |
+ |
+static inline void |
+symbol_check_alias_consistency (symbol *this) |
+{ |
+ 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 (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 (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); |
+ } |
+} |
+ |
+static bool |
+symbol_check_alias_consistency_processor (void *this, |
+ void *null ATTRIBUTE_UNUSED) |
+{ |
+ symbol_check_alias_consistency (this); |
+ return true; |
+} |
+ |
+ |
+/*-------------------------------------------------------------------. |
+| Assign a symbol number, and write the definition of the token name | |
+| into FDEFINES. Put in SYMBOLS. | |
+`-------------------------------------------------------------------*/ |
+ |
+static inline bool |
+symbol_pack (symbol *this) |
+{ |
+ 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); |
+ |
+ symbols[this->number] = this; |
+ return true; |
+} |
+ |
+static bool |
+symbol_pack_processor (void *this, void *null ATTRIBUTE_UNUSED) |
+{ |
+ return symbol_pack (this); |
+} |
+ |
+ |
+ |
+ |
+/*--------------------------------------------------. |
+| Put THIS in TOKEN_TRANSLATIONS if it is a token. | |
+`--------------------------------------------------*/ |
+ |
+static inline bool |
+symbol_translation (symbol *this) |
+{ |
+ /* Non-terminal? */ |
+ if (this->class == token_sym |
+ && this->user_token_number != USER_NUMBER_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); |
+ |
+ token_translations[this->user_token_number] = this->number; |
+ } |
+ |
+ return true; |
+} |
+ |
+static bool |
+symbol_translation_processor (void *this, void *null ATTRIBUTE_UNUSED) |
+{ |
+ return symbol_translation (this); |
+} |
+ |
+ |
+/*---------------------------------------. |
+| Symbol and semantic type hash tables. | |
+`---------------------------------------*/ |
+ |
+/* 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_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) |
+{ |
+ /* 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) |
+{ |
+ /* 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. | |
+`-------------------------------*/ |
+ |
+void |
+symbols_new (void) |
+{ |
+ symbol_table = hash_initialize (HT_INITIAL_CAPACITY, |
+ 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); |
+} |
+ |
+ |
+/*----------------------------------------------------------------. |
+| Find the symbol named KEY, and return it. If it does not exist | |
+| yet, create it. | |
+`----------------------------------------------------------------*/ |
+ |
+symbol * |
+symbol_from_uniqstr (const uniqstr key, location loc) |
+{ |
+ symbol probe; |
+ symbol *entry; |
+ |
+ probe.tag = key; |
+ entry = hash_lookup (symbol_table, &probe); |
+ |
+ if (!entry) |
+ { |
+ /* First insertion in the hash. */ |
+ 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. | |
+`-------------------*/ |
+ |
+void |
+symbols_free (void) |
+{ |
+ hash_free (symbol_table); |
+ hash_free (semantic_type_table); |
+ free (symbols); |
+} |
+ |
+ |
+/*---------------------------------------------------------------. |
+| Look for undefined symbols, report an error, and consider them | |
+| terminals. | |
+`---------------------------------------------------------------*/ |
+ |
+static void |
+symbols_do (Hash_processor processor, void *processor_data) |
+{ |
+ hash_do_for_each (symbol_table, processor, processor_data); |
+} |
+ |
+ |
+/*--------------------------------------------------------------. |
+| Check that all the symbols are defined. Report any undefined | |
+| symbols and consider them nonterminals. | |
+`--------------------------------------------------------------*/ |
+ |
+void |
+symbols_check_defined (void) |
+{ |
+ symbols_do (symbol_check_defined_processor, NULL); |
+} |
+ |
+/*------------------------------------------------------------------. |
+| Set TOKEN_TRANSLATIONS. Check that no two symbols share the same | |
+| number. | |
+`------------------------------------------------------------------*/ |
+ |
+static void |
+symbols_token_translations_init (void) |
+{ |
+ bool num_256_available_p = true; |
+ int i; |
+ |
+ /* Find the highest user token number, and whether 256, the POSIX |
+ preferred user token number for the error token, is used. */ |
+ max_user_token_number = 0; |
+ for (i = 0; i < ntokens; ++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; |
+ } |
+ } |
+ |
+ /* If 256 is not used, assign it to error, to follow POSIX. */ |
+ if (num_256_available_p |
+ && errtoken->user_token_number == USER_NUMBER_UNDEFINED) |
+ errtoken->user_token_number = 256; |
+ |
+ /* Set the missing user numbers. */ |
+ if (max_user_token_number < 256) |
+ max_user_token_number = 256; |
+ |
+ for (i = 0; i < ntokens; ++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 = 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. |
+ */ |
+ for (i = 0; i < max_user_token_number + 1; i++) |
+ token_translations[i] = undeftoken->number; |
+ symbols_do (symbol_translation_processor, NULL); |
+} |
+ |
+ |
+/*----------------------------------------------------------------. |
+| Assign symbol numbers, and write definition of token names into | |
+| FDEFINES. Set up vectors SYMBOL_TABLE, TAGS of symbols. | |
+`----------------------------------------------------------------*/ |
+ |
+void |
+symbols_pack (void) |
+{ |
+ 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"), |
+ startsymbol->tag); |
+ else if (startsymbol->class == token_sym) |
+ fatal_at (startsymbol_location, |
+ _("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; |
+} |
Property changes on: bison\src\bison\2.4.1\bison-2.4.1-src\src\symtab.c |
___________________________________________________________________ |
Added: svn:eol-style |
+ LF |