X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/07c0db18b4a795a3a35a4d98b3d001bfc7d4e1c1..63951be29fcb8e21146a9377176d53d509c575ca:/src/symtab.c?ds=sidebyside diff --git a/src/symtab.c b/src/symtab.c index fd2a8b36..002f6e37 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. | `------------------------*/ @@ -62,7 +67,7 @@ symbol_new (uniqstr tag, location loc) /* 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, '-')) + if (tag[0] != '\"' && tag[0] != '\'' && mbschr (tag, '-')) yacc_at (loc, _("POSIX Yacc forbids dashes in symbol names: %s"), tag); @@ -177,24 +182,6 @@ symbol_type_set (symbol *sym, uniqstr type_name, 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. | `-----------------------------------------*/ @@ -380,10 +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; } } @@ -420,11 +408,11 @@ 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); + 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 { str->class = token_sym; @@ -447,7 +435,7 @@ static inline void symbol_check_alias_consistency (symbol *this) { symbol *sym = this; - symbol *str = this->alias; + symbol *str = this->alias; /* Check only the symbol in the symbol-string pair. */ if (!(this->alias @@ -507,31 +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_HAS_STRING_ALIASes. */ - if (this->user_token_number == USER_NUMBER_HAS_STRING_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; @@ -548,10 +516,10 @@ 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; @@ -695,6 +663,7 @@ symbol_from_uniqstr (const uniqstr key, location loc) if (!entry) { /* First insertion in the hash. */ + aver (!symbols_sorted); entry = symbol_new (key, loc); if (!hash_insert (symbol_table, entry)) xalloc_die (); @@ -789,6 +758,7 @@ symbols_free (void) hash_free (symbol_table); hash_free (semantic_type_table); free (symbols); + free (symbols_sorted); } @@ -797,13 +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. |