X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/84526bf3d156154d8372fff0d232dd4f347f2233..cc8962bdde81b04aa728aef21e53b4a08a0debfe:/src/symtab.c diff --git a/src/symtab.c b/src/symtab.c index d25b9368..b132e07b 100644 --- a/src/symtab.c +++ b/src/symtab.c @@ -1,6 +1,6 @@ /* Symbol table manager for Bison. - Copyright (C) 1984, 1989, 2000-2002, 2004-2012 Free Software + Copyright (C) 1984, 1989, 2000-2002, 2004-2013 Free Software Foundation, Inc. This file is part of Bison, the GNU Compiler Compiler. @@ -33,6 +33,7 @@ `-------------------------------------------------------------------*/ static symbol **symbols_sorted = NULL; +static symbol **semantic_types_sorted = NULL; /*------------------------. | Distinguished symbols. | @@ -45,14 +46,17 @@ symbol *accept = NULL; symbol *startsymbol = NULL; location startsymbol_location; -/*---------------------------------------. -| Default %destructor's and %printer's. | -`---------------------------------------*/ +/*---------------------------. +| Precedence relation graph. | +`---------------------------*/ + +static symgraph **prec_nodes; -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; +/*-----------------------------------. +| Store which associativity is used. | +`-----------------------------------*/ + +bool *used_assoc = NULL; /*---------------------------------. | Create a new symbol, named TAG. | @@ -62,21 +66,23 @@ static symbol * 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] != '\'' && strchr (tag, '-')) - yacc_at (loc, _("POSIX Yacc forbids dashes in symbol names: %s"), - tag); + complain (&loc, Wyacc, + _("POSIX Yacc forbids dashes in symbol names: %s"), tag); res->tag = tag; res->location = loc; res->type_name = NULL; - code_props_none_init (&res->destructor); - code_props_none_init (&res->printer); + { + int i; + for (i = 0; i < CODE_PROPS_SIZE; ++i) + code_props_none_init (&res->props[i]); + } res->number = NUMBER_UNDEFINED; res->prec = 0; @@ -85,28 +91,46 @@ symbol_new (uniqstr tag, location loc) res->alias = NULL; res->class = unknown_sym; - res->declared = false; + res->status = undeclared; if (nsyms == SYMBOL_NUMBER_MAXIMUM) - fatal (_("too many symbols in input grammar (limit is %d)"), - SYMBOL_NUMBER_MAXIMUM); + complain (NULL, fatal, _("too many symbols in input grammar (limit is %d)"), + SYMBOL_NUMBER_MAXIMUM); nsyms++; return res; } +char const * +code_props_type_string (code_props_type kind) +{ + switch (kind) + { + case destructor: + return "%destructor"; + case printer: + return "%printer"; + } + assert (0); +} + /*----------------------------------------. | Create a new semantic type, named TAG. | `----------------------------------------*/ static semantic_type * -semantic_type_new (uniqstr tag) +semantic_type_new (uniqstr tag, const location *loc) { semantic_type *res = xmalloc (sizeof *res); uniqstr_assert (tag); res->tag = tag; - code_props_none_init (&res->destructor); - code_props_none_init (&res->printer); + res->location = loc ? *loc : empty_location; + res->status = undeclared; + { + int i; + for (i = 0; i < CODE_PROPS_SIZE; ++i) + code_props_none_init (&res->props[i]); + } return res; } @@ -120,22 +144,22 @@ semantic_type_new (uniqstr tag) 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) +#define SYMBOL_CODE_PRINT(Attr) \ + if (s->props[Attr].code) \ + fprintf (f, " %s { %s }", #Attr, s->props[Attr].code) void -symbol_print (symbol *s, FILE *f) +symbol_print (symbol const *s, FILE *f) { if (s) { - fprintf (f, "\"%s\"", s->tag); + fputs (s->tag, f); SYMBOL_ATTR_PRINT (type_name); SYMBOL_CODE_PRINT (destructor); SYMBOL_CODE_PRINT (printer); } else - fprintf (f, ""); + fputs ("", f); } #undef SYMBOL_ATTR_PRINT @@ -185,16 +209,24 @@ 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")); + unsigned i = 0; + complain_indent (&second, complaint, &i, + _("%s redeclaration for %s"), what, s->tag); + i += SUB_INDENT; + complain_indent (&first, complaint, &i, + _("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")); + unsigned i = 0; + complain_indent (&second, complaint, &i, + _("%s redeclaration for <%s>"), what, s->tag); + i += SUB_INDENT; + complain_indent (&first, complaint, &i, + _("previous declaration")); } @@ -217,115 +249,66 @@ symbol_type_set (symbol *sym, uniqstr type_name, location loc) } } -/*-----------------------------------------. -| Set the DESTRUCTOR associated with SYM. | -`-----------------------------------------*/ +/*--------------------------------------------------------. +| Set the DESTRUCTOR or PRINTER associated with the SYM. | +`--------------------------------------------------------*/ void -symbol_destructor_set (symbol *sym, code_props const *destructor) +symbol_code_props_set (symbol *sym, code_props_type kind, + code_props const *code) { - if (sym->destructor.code) - symbol_redeclaration (sym, "%destructor", sym->destructor.location, - destructor->location); - sym->destructor = *destructor; + if (sym->props[kind].code) + symbol_redeclaration (sym, code_props_type_string (kind), + sym->props[kind].location, + code->location); + sym->props[kind] = *code; } -/*------------------------------------------. -| Set the DESTRUCTOR associated with TYPE. | -`------------------------------------------*/ +/*-----------------------------------------------------. +| Set the DESTRUCTOR or PRINTER associated with TYPE. | +`-----------------------------------------------------*/ void -semantic_type_destructor_set (semantic_type *type, - code_props const *destructor) +semantic_type_code_props_set (semantic_type *type, + code_props_type kind, + code_props const *code) { - if (type->destructor.code) - semantic_type_redeclaration (type, "%destructor", - type->destructor.location, - destructor->location); - type->destructor = *destructor; + if (type->props[kind].code) + semantic_type_redeclaration (type, code_props_type_string (kind), + type->props[kind].location, + code->location); + type->props[kind] = *code; } -/*---------------------------------------. -| Get the computed %destructor for SYM. | -`---------------------------------------*/ +/*---------------------------------------------------. +| Get the computed %destructor or %printer for SYM. | +`---------------------------------------------------*/ -code_props const * -symbol_destructor_get (symbol const *sym) +code_props * +symbol_code_props_get (symbol *sym, code_props_type kind) { - /* Per-symbol %destructor. */ - if (sym->destructor.code) - return &sym->destructor; + /* Per-symbol code props. */ + if (sym->props[kind].code) + return &sym->props[kind]; - /* Per-type %destructor. */ + /* Per-type code props. */ if (sym->type_name) { - code_props const *destructor = - &semantic_type_get (sym->type_name)->destructor; - if (destructor->code) - return destructor; + code_props *code = + &semantic_type_get (sym->type_name, NULL)->props[kind]; + if (code->code) + return code; } - /* Apply default %destructor's only to user-defined symbols. */ - if (sym->tag[0] == '$' || sym == errtoken) - return &code_props_none; - - if (sym->type_name) - return &default_tagged_destructor; - return &default_tagless_destructor; -} - -/*--------------------------------------. -| Set the PRINTER associated with SYM. | -`--------------------------------------*/ - -void -symbol_printer_set (symbol *sym, code_props const *printer) -{ - if (sym->printer.code) - symbol_redeclaration (sym, "%printer", - sym->printer.location, printer->location); - sym->printer = *printer; -} - -/*---------------------------------------. -| Set the PRINTER associated with TYPE. | -`---------------------------------------*/ - -void -semantic_type_printer_set (semantic_type *type, code_props const *printer) -{ - if (type->printer.code) - semantic_type_redeclaration (type, "%printer", - type->printer.location, printer->location); - type->printer = *printer; -} - -/*------------------------------------. -| Get the computed %printer for SYM. | -`------------------------------------*/ - -code_props const * -symbol_printer_get (symbol const *sym) -{ - /* Per-symbol %printer. */ - if (sym->printer.code) - return &sym->printer; - - /* Per-type %printer. */ - if (sym->type_name) + /* Apply default code props's only to user-defined symbols. */ + if (sym->tag[0] != '$' && sym != errtoken) { - code_props const *printer = &semantic_type_get (sym->type_name)->printer; - if (printer->code) - return printer; + code_props *code = + &semantic_type_get (sym->type_name ? "*" : "", NULL)->props[kind]; + if (code->code) + return code; } - - /* 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; + return &code_props_none; } /*-----------------------------------------------------------------. @@ -358,10 +341,12 @@ symbol_precedence_set (symbol *sym, int prec, assoc a, location loc) void symbol_class_set (symbol *sym, symbol_class class, location loc, bool declaring) { + bool warned = false; if (sym->class != unknown_sym && sym->class != class) { - complain_at (loc, _("symbol %s redefined"), sym->tag); - sym->declared = false; + complain (&loc, complaint, _("symbol %s redefined"), sym->tag); + /* Don't report both "redefined" and "redeclared". */ + warned = true; } if (class == nterm_sym && sym->class != nterm_sym) @@ -373,9 +358,9 @@ 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); - sym->declared = true; + if (sym->status == declared && !warned) + complain (&loc, Wother, _("symbol %s redeclared"), sym->tag); + sym->status = declared; } } @@ -395,7 +380,8 @@ symbol_user_token_number_set (symbol *sym, int user_token_number, location loc) 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); + complain (&loc, complaint, _("redefining user token number of %s"), + sym->tag); *user_token_numberp = user_token_number; /* User defined $end token? */ @@ -421,14 +407,55 @@ 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); + assert (sym->status != declared); + complain (&sym->location, + sym->status == needed ? complaint : Wother, + _("symbol %s is used, but is not defined as a token" + " and has no rules"), + sym->tag); sym->class = nterm_sym; sym->number = nvars++; } + { + int i; + for (i = 0; i < 2; ++i) + symbol_code_props_get (sym, i)->is_used = true; + } + + /* Set the semantic type status associated to the current symbol to + 'declared' so that we could check semantic types unnecessary uses. */ + if (sym->type_name) + { + semantic_type *sem_type = semantic_type_get (sym->type_name, NULL); + if (sem_type) + sem_type->status = declared; + } + + return true; +} + +static inline bool +semantic_type_check_defined (semantic_type *sem_type) +{ + /* <*> and <> do not have to be "declared". */ + if (sem_type->status == declared + || !*sem_type->tag + || STREQ(sem_type->tag, "*")) + { + int i; + for (i = 0; i < 2; ++i) + if (sem_type->props[i].kind != CODE_PROPS_NONE + && ! sem_type->props[i].is_used) + complain (&sem_type->location, Wother, + _("useless %s for type <%s>"), + code_props_type_string (i), sem_type->tag); + } + else + complain (&sem_type->location, Wother, + _("type <%s> is used, but is not associated to any symbol"), + sem_type->tag); + return true; } @@ -438,16 +465,23 @@ symbol_check_defined_processor (void *sym, void *null ATTRIBUTE_UNUSED) return symbol_check_defined (sym); } +static bool +semantic_type_check_defined_processor (void *sem_type, + void *null ATTRIBUTE_UNUSED) +{ + return semantic_type_check_defined (sem_type); +} + void symbol_make_alias (symbol *sym, symbol *str, location loc) { if (str->alias) - warn_at (loc, _("symbol %s used more than once as a literal string"), - str->tag); + complain (&loc, Wother, + _("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); + complain (&loc, Wother, + _("symbol %s given more than one literal string"), sym->tag); else { str->class = token_sym; @@ -486,21 +520,14 @@ symbol_check_alias_consistency (symbol *this) } - if (str->destructor.code || sym->destructor.code) - { - if (str->destructor.code) - symbol_destructor_set (sym, &str->destructor); - else - symbol_destructor_set (str, &sym->destructor); - } - - if (str->printer.code || sym->printer.code) - { - if (str->printer.code) - symbol_printer_set (sym, &str->printer); - else - symbol_printer_set (str, &sym->printer); - } + { + int i; + for (i = 0; i < CODE_PROPS_SIZE; ++i) + if (str->props[i].code) + symbol_code_props_set (sym, i, &str->props[i]); + else if (sym->props[i].code) + symbol_code_props_set (str, i, &sym->props[i]); + } if (sym->prec || str->prec) { @@ -550,6 +577,7 @@ symbol_pack_processor (void *this, void *null ATTRIBUTE_UNUSED) static void user_token_number_redeclaration (int num, symbol *first, symbol *second) { + unsigned i = 0; /* User token numbers are not assigned during the parsing, but in a second step, via a traversal of the symbol table sorted on tag. @@ -561,11 +589,13 @@ user_token_number_redeclaration (int num, symbol *first, symbol *second) 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); + complain_indent (&second->location, complaint, &i, + _("user token number %d redeclaration for %s"), + num, second->tag); + i += SUB_INDENT; + complain_indent (&first->location, complaint, &i, + _("previous declaration for %s"), + first->tag); } /*--------------------------------------------------. @@ -713,7 +743,7 @@ symbol_from_uniqstr (const uniqstr key, location loc) `-----------------------------------------------------------------------*/ semantic_type * -semantic_type_from_uniqstr (const uniqstr key) +semantic_type_from_uniqstr (const uniqstr key, const location *loc) { semantic_type probe; semantic_type *entry; @@ -724,7 +754,7 @@ semantic_type_from_uniqstr (const uniqstr key) if (!entry) { /* First insertion in the hash. */ - entry = semantic_type_new (key); + entry = semantic_type_new (key, loc); if (!hash_insert (semantic_type_table, entry)) xalloc_die (); } @@ -750,9 +780,9 @@ symbol_get (const char *key, location loc) `-----------------------------------------------------------------------*/ semantic_type * -semantic_type_get (const char *key) +semantic_type_get (const char *key, const location *loc) { - return semantic_type_from_uniqstr (uniqstr_new (key)); + return semantic_type_from_uniqstr (uniqstr_new (key), loc); } @@ -794,6 +824,7 @@ symbols_free (void) hash_free (semantic_type_table); free (symbols); free (symbols_sorted); + free (semantic_types_sorted); } @@ -815,20 +846,20 @@ symbols_cmp_qsort (void const *a, void const *b) } static void -symbols_do (Hash_processor processor, void *processor_data) +symbols_do (Hash_processor processor, void *processor_data, + struct hash_table *table, symbol ***sorted) { - size_t count = hash_get_n_entries (symbol_table); - if (!symbols_sorted) + size_t count = hash_get_n_entries (table); + if (!*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); + *sorted = xnmalloc (count, sizeof **sorted); + hash_get_entries (table, (void**)*sorted, count); + qsort (*sorted, count, sizeof **sorted, symbols_cmp_qsort); } { size_t i; for (i = 0; i < count; ++i) - processor (symbols_sorted[i], processor_data); + processor ((*sorted)[i], processor_data); } } @@ -840,7 +871,10 @@ symbols_do (Hash_processor processor, void *processor_data) void symbols_check_defined (void) { - symbols_do (symbol_check_defined_processor, NULL); + symbols_do (symbol_check_defined_processor, NULL, + symbol_table, &symbols_sorted); + symbols_do (semantic_type_check_defined_processor, NULL, + semantic_type_table, &semantic_types_sorted); } /*------------------------------------------------------------------. @@ -894,7 +928,8 @@ symbols_token_translations_init (void) 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); + symbols_do (symbol_translation_processor, NULL, + symbol_table, &symbols_sorted); } @@ -906,10 +941,11 @@ symbols_token_translations_init (void) void symbols_pack (void) { - symbols_do (symbol_check_alias_consistency_processor, NULL); + symbols_do (symbol_check_alias_consistency_processor, NULL, + symbol_table, &symbols_sorted); symbols = xcalloc (nsyms, sizeof *symbols); - symbols_do (symbol_pack_processor, NULL); + symbols_do (symbol_pack_processor, NULL, symbol_table, &symbols_sorted); /* Aliases leave empty slots in symbols, so remove them. */ { @@ -938,68 +974,195 @@ symbols_pack (void) symbols_token_translations_init (); if (startsymbol->class == unknown_sym) - fatal_at (startsymbol_location, + complain (&startsymbol_location, fatal, _("the start symbol %s is undefined"), startsymbol->tag); else if (startsymbol->class == token_sym) - fatal_at (startsymbol_location, + complain (&startsymbol_location, fatal, _("the start symbol %s is a token"), startsymbol->tag); } +/*---------------------------------. +| Initialize relation graph nodes. | +`---------------------------------*/ -/*--------------------------------------------------. -| Set default tagged/tagless %destructor/%printer. | -`--------------------------------------------------*/ +static void +init_prec_nodes (void) +{ + int i; + prec_nodes = xcalloc (nsyms, sizeof *prec_nodes); + for (i = 0; i < nsyms; ++i) + { + prec_nodes[i] = xmalloc (sizeof *prec_nodes[i]); + symgraph *s = prec_nodes[i]; + s->id = i; + s->succ = 0; + s->pred = 0; + } +} -void -default_tagged_destructor_set (code_props const *destructor) +/*----------------. +| Create a link. | +`----------------*/ + +static symgraphlink * +symgraphlink_new (graphid id, symgraphlink *next) +{ + symgraphlink *l = xmalloc (sizeof *l); + l->id = id; + l->next = next; + return l; +} + + +/*------------------------------------------------------------------. +| Register the second symbol of the precedence relation, and return | +| whether this relation is new. Use only in register_precedence. | +`------------------------------------------------------------------*/ + +static bool +register_precedence_second_symbol (symgraphlink **first, graphid sym) { - if (default_tagged_destructor.code) + if (!*first || sym < (*first)->id) + *first = symgraphlink_new (sym, *first); + else { - complain_at (destructor->location, - _("redeclaration for default tagged %%destructor")); - complain_at (default_tagged_destructor.location, - _("previous declaration")); + symgraphlink *slist = *first; + + while (slist->next && slist->next->id <= sym) + slist = slist->next; + + if (slist->id == sym) + /* Relation already present. */ + return false; + + slist->next = symgraphlink_new (sym, slist->next); } - default_tagged_destructor = *destructor; + return true; } +/*------------------------------------------------------------------. +| Register a new relation between symbols as used. The first symbol | +| has a greater precedence than the second one. | +`------------------------------------------------------------------*/ + void -default_tagless_destructor_set (code_props const *destructor) +register_precedence (graphid first, graphid snd) +{ + if (!prec_nodes) + init_prec_nodes (); + register_precedence_second_symbol (&(prec_nodes[first]->succ), snd); + register_precedence_second_symbol (&(prec_nodes[snd]->pred), first); +} + + +/*---------------------------------------. +| Deep clear a linked / adjacency list). | +`---------------------------------------*/ + +static void +linkedlist_free (symgraphlink *node) { - if (default_tagless_destructor.code) + if (node) { - complain_at (destructor->location, - _("redeclaration for default tagless %%destructor")); - complain_at (default_tagless_destructor.location, - _("previous declaration")); + while (node->next) + { + symgraphlink *tmp = node->next; + free (node); + node = tmp; + } + free (node); } - default_tagless_destructor = *destructor; } -void -default_tagged_printer_set (code_props const *printer) +/*----------------------------------------------. +| Clear and destroy association tracking table. | +`----------------------------------------------*/ + +static void +assoc_free (void) { - if (default_tagged_printer.code) + int i; + for (i = 0; i < nsyms; ++i) { - complain_at (printer->location, - _("redeclaration for default tagged %%printer")); - complain_at (default_tagged_printer.location, - _("previous declaration")); + linkedlist_free (prec_nodes[i]->pred); + linkedlist_free (prec_nodes[i]->succ); + free (prec_nodes[i]); } - default_tagged_printer = *printer; + free (prec_nodes); +} + +/*---------------------------------------. +| Initialize association tracking table. | +`---------------------------------------*/ + +static void +init_assoc (void) +{ + graphid i; + used_assoc = xcalloc(nsyms, sizeof(*used_assoc)); + for (i = 0; i < nsyms; ++i) + used_assoc[i] = false; +} + +/*------------------------------------------------------------------. +| Test if the associativity for the symbols is defined and useless. | +`------------------------------------------------------------------*/ + +static inline bool +is_assoc_useless (symbol *s) +{ + return s + && s->assoc != undef_assoc + && s->assoc != precedence_assoc + && !used_assoc[s->number]; +} + +/*-------------------------------. +| Register a used associativity. | +`-------------------------------*/ + +void +register_assoc (graphid i, graphid j) +{ + if (!used_assoc) + init_assoc (); + used_assoc[i] = true; + used_assoc[j] = true; } +/*--------------------------------------------------. +| Print a warning for unused precedence relations. | +`--------------------------------------------------*/ + void -default_tagless_printer_set (code_props const *printer) +print_precedence_warnings (void) { - if (default_tagless_printer.code) + int i; + if (!prec_nodes) + init_prec_nodes (); + if (!used_assoc) + init_assoc (); + for (i = 0; i < nsyms; ++i) { - complain_at (printer->location, - _("redeclaration for default tagless %%printer")); - complain_at (default_tagless_printer.location, - _("previous declaration")); + symbol *s = symbols[i]; + if (s + && s->prec != 0 + && !prec_nodes[i]->pred + && !prec_nodes[i]->succ) + { + if (is_assoc_useless (s)) + complain (&s->location, Wprecedence, + _("useless precedence and associativity for %s"), s->tag); + else if (s->assoc == precedence_assoc) + complain (&s->location, Wprecedence, + _("useless precedence for %s"), s->tag); + } + else if (is_assoc_useless (s)) + complain (&s->location, Wprecedence, + _("useless associativity for %s, use %%precedence"), s->tag); } - default_tagless_printer = *printer; + free (used_assoc); + assoc_free (); }