X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/95d176ffd9f66a01125c366226e1a557b125e0d8..4b7a4c1b1c8c18e9ad2517c117442b9b7d7e671a:/src/symtab.c

diff --git a/src/symtab.c b/src/symtab.c
index 930899ce..7d18f92d 100644
--- a/src/symtab.c
+++ b/src/symtab.c
@@ -29,6 +29,13 @@
 #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.  |
 `------------------------*/
@@ -367,7 +374,7 @@ 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;
@@ -416,29 +423,24 @@ 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)
+  if (str->alias)
     warn_at (loc, _("symbol `%s' used more than once as a literal string"),
-	     symval->tag);
+	     str->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);
+      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);
     }
 }
 
@@ -451,46 +453,47 @@ 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 (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);
     }
 }
 
@@ -530,8 +533,8 @@ symbol_pack (symbol *this)
 	      this->number = this->alias->number;
 	    }
 	}
-      /* Do not do processing below for USER_NUMBER_ALIASes.  */
-      if (this->user_token_number == USER_NUMBER_ALIAS)
+      /* 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 */
@@ -552,10 +555,10 @@ 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;
@@ -578,7 +581,7 @@ 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)
@@ -699,6 +702,7 @@ 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 ();
@@ -793,6 +797,7 @@ symbols_free (void)
   hash_free (symbol_table);
   hash_free (semantic_type_table);
   free (symbols);
+  free (symbols_sorted);
 }
 
 
@@ -801,13 +806,36 @@ 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.                       |