gengtype-lex.l: Distinguish unions from structures in the token type.

	* gengtype-lex.l: Distinguish unions from structures in the
	token type.  Don't call find_structure; return the tag as a string.
	* gengtype-yacc.y: Add new token types ENT_TYPEDEF_UNION and ENT_UNION.
	Type of these, ENT_TYPEDEF_STRUCT, and ENT_STRUCT is string.
	Reorganize typedef_struct production accordingly.
	Use create_nested_ptr_option.
	* gengtype.c (create_nested_ptr_option): New function.
	* gengtype.h: Declare it.

From-SVN: r123232

gcc/ChangeLog

 2007-03-26  Zack Weinberg  <zackw@panix.com>
 
+	* gengtype-lex.l: Distinguish unions from structures in the
+	token type.  Don't call find_structure; return the tag as a string.
+	* gengtype-yacc.y: Add new token types ENT_TYPEDEF_UNION and ENT_UNION.
+	Type of these, ENT_TYPEDEF_STRUCT, and ENT_STRUCT is string.
+	Reorganize typedef_struct production accordingly.
+	Use create_nested_ptr_option.
+	* gengtype.c (create_nested_ptr_option): New function.
+	* gengtype.h: Declare it.
+
 	* gengtype.h (struct type): Replace 'sc' with boolean, scalar_is_char.
 	(string_type): Don't declare.
 	(do_scalar_typedef): Declare.

gcc/gengtype-lex.l

@@ -171,12 +171,12 @@ ITYPE	{IWORD}({WS}{IWORD})*
   for (taglen = 1; ISIDNUM (tagstart[taglen]); taglen++)
     ;
 
-  yylval.t = find_structure ((const char *) xmemdup (tagstart, taglen,
-						     taglen + 1),
-			     union_p);
+  yylval.s = (const char *) xmemdup (tagstart, taglen, taglen + 1);
+
   BEGIN(in_struct);
   update_lineno (yytext, yyleng);
-  return typedef_p ? ENT_TYPEDEF_STRUCT : ENT_STRUCT;
+  return union_p ? (typedef_p ? ENT_TYPEDEF_UNION : ENT_UNION)
+                 : (typedef_p ? ENT_TYPEDEF_STRUCT : ENT_STRUCT);
 }
 
 [^[:alnum:]_](extern|static){WS}/"GTY" {

gcc/gengtype-yacc.y

@@ -35,8 +35,10 @@ Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
   const char *s;
 }
 
-%token <t>ENT_TYPEDEF_STRUCT
-%token <t>ENT_STRUCT
+%token <s>ENT_TYPEDEF_STRUCT
+%token <s>ENT_STRUCT
+%token <s>ENT_TYPEDEF_UNION
+%token <s>ENT_UNION
 %token ENT_EXTERNSTATIC
 %token GTY_TOKEN
 %token VEC_TOKEN
@@ -68,21 +70,30 @@ start: /* empty */
 
 typedef_struct: ENT_TYPEDEF_STRUCT options '{' struct_fields '}' ID
 		   {
-		     new_structure ($1->u.s.tag, UNION_P ($1), &lexer_line,
-				    $4, $2);
-		     do_typedef ($6, $1, &lexer_line);
+		     type_p t = new_structure ($1, false, &lexer_line, $4, $2);
+		     do_typedef ($6, t, &lexer_line);
 		     lexer_toplevel_done = 1;
 		   }
-		 ';'
-		   {}
+		  ';'
+		| ENT_TYPEDEF_UNION options '{' struct_fields '}' ID
+		   {
+		     type_p t = new_structure ($1, true, &lexer_line, $4, $2);
+		     do_typedef ($6, t, &lexer_line);
+		     lexer_toplevel_done = 1;
+		   }
+		  ';'
 		| ENT_STRUCT options '{' struct_fields '}'
 		   {
-		     new_structure ($1->u.s.tag, UNION_P ($1), &lexer_line,
-				    $4, $2);
+		     new_structure ($1, false, &lexer_line, $4, $2);
 		     lexer_toplevel_done = 1;
 		   }
-		 ';'
-		   {}
+		  ';'
+		| ENT_UNION options '{' struct_fields '}'
+		   {
+		     new_structure ($1, true, &lexer_line, $4, $2);
+		     lexer_toplevel_done = 1;
+		   }
+		  ';'
 		;
 
 externstatic: ENT_EXTERNSTATIC options lasttype ID semiequal
@@ -210,15 +221,7 @@ option:   ID
 	| type_option '(' type ')'
 	    { $$ = create_option (NULL, $1, adjust_field_type ($3, NULL)); }
 	| NESTED_PTR '(' type ',' stringseq ',' stringseq ')'
-	    {
-	      struct nested_ptr_data d;
-
-	      d.type = adjust_field_type ($3, NULL);
-	      d.convert_to = $5;
-	      d.convert_from = $7;
-	      $$ = create_option (NULL, "nested_ptr",
-				  xmemdup (&d, sizeof (d), sizeof (d)));
-	    }
+	    { $$ = create_nested_ptr_option ($3, $5, $7); }
 	;
 
 optionseq: option

gcc/gengtype.c

@@ -330,6 +330,18 @@ create_option (options_p next, const char *name, const void *info)
   return o;
 }
 
+/* Return an options structure for a "nested_ptr" option.  */
+options_p
+create_nested_ptr_option (type_p t, const char *to, const char *from)
+{
+  struct nested_ptr_data *d = XNEW (struct nested_ptr_data);
+
+  d->type = adjust_field_type (t, 0);
+  d->convert_to = to;
+  d->convert_from = from;
+  return create_option (NULL, "nested_ptr", d);
+}
+
 /* Add a variable named S of type T with options O defined at POS,
    to `variables'.  */
 

gcc/gengtype.h

@@ -139,6 +139,8 @@ extern type_p create_scalar_type (const char *name);
 extern type_p create_pointer (type_p t);
 extern type_p create_array (type_p t, const char *len);
 extern options_p create_option (options_p, const char *name, const void *info);
+extern options_p create_nested_ptr_option (type_p t, const char *from,
+					   const char *to);
 extern type_p adjust_field_type (type_p, options_p);
 extern void note_variable (const char *s, type_p t, options_p o,
 			   struct fileloc *pos);