c-common.h (ASM_INPUT_P): New.

        * c-common.h (ASM_INPUT_P): New.
        * c-parse.in (asm): Set it when needed.
        * c-semantics.c (genrtl_asm_stmt): Test it instead of the
        existance of an operand.

        * cp/parse.y (asm): Set ASM_INPUT_P.

From-SVN: r38638

gcc/ChangeLog

+2001-01-02  Richard Henderson  <rth@redhat.com>
+
+	* c-common.h (ASM_INPUT_P): New.
+	* c-parse.in (asm): Set it when needed.
+	* c-semantics.c (genrtl_asm_stmt): Test it instead of the 
+	existance of an operand.
+
 Tue Jan  2 20:27:07 MET 2001  Jan Hubicka  <jh@suse.cz>
 
 	* dwarf2out.c (stack_adjust_offset): Handle PRE_MODIFY.

gcc/c-common.h

@@ -31,6 +31,7 @@ Boston, MA 02111-1307, USA.  */
       SCOPE_BEGIN_P (in SCOPE_STMT)
       DECL_PRETTY_FUNCTION_P (in VAR_DECL)
       NEW_FOR_SCOPE_P (in FOR_STMT)
+      ASM_INPUT_P (in ASM_STMT)
    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
       STMT_IS_FULL_EXPR_P (in _STMT)
    2: STMT_LINENO_FOR_FN_P (in _STMT)
@@ -666,6 +667,10 @@ extern tree strip_array_types                   PARAMS ((tree));
    initialization variables. */
 #define NEW_FOR_SCOPE_P(NODE) (TREE_LANG_FLAG_0 (NODE))
 
+/* Nonzero if we want to create an ASM_INPUT instead of an
+   ASM_OPERAND with no operands.  */
+#define ASM_INPUT_P(NODE) (TREE_LANG_FLAG_0 (NODE))
+
 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 
 enum c_tree_code {
@@ -694,7 +699,7 @@ extern void genrtl_case_label                   PARAMS ((tree));
 extern void genrtl_compound_stmt                PARAMS ((tree));
 extern void genrtl_asm_stmt                     PARAMS ((tree, tree,
 							 tree, tree,
-							 tree));
+							 tree, int));
 extern void genrtl_decl_cleanup                 PARAMS ((tree, tree));
 extern int stmts_are_full_exprs_p               PARAMS ((void));
 extern int anon_aggr_type_p                     PARAMS ((tree));

gcc/c-parse.in

 /* YACC parser for C syntax and for Objective C.  -*-c-*-
    Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996,
-   1997, 1998, 1999, 2000 Free Software Foundation, Inc.
+   1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
 
 This file is part of GNU CC.
 
@@ -1953,6 +1953,7 @@ stmt:
 		      $$ = add_stmt (build_stmt (ASM_STMT, NULL_TREE, $4,
 						 NULL_TREE, NULL_TREE,
 						 NULL_TREE));
+		      ASM_INPUT_P ($$) = 1;
 		    }
 		  else
 		    {

gcc/c-semantics.c

 /* This file contains the definitions and documentation for the common
    tree codes used in the GNU C and C++ compilers (see c-common.def
    for the standard codes).  
-   Copyright (C) 2000 Free Software Foundation, Inc.  Written by
-   Benjamin Chelf (chelf@codesourcery.com).
+   Copyright (C) 2000, 2001 Free Software Foundation, Inc.
+   Written by Benjamin Chelf (chelf@codesourcery.com).
 
 This file is part of GNU CC.
 
@@ -717,12 +717,13 @@ genrtl_compound_stmt (t)
 
 void
 genrtl_asm_stmt (cv_qualifier, string, output_operands,
-		 input_operands, clobbers)
+		 input_operands, clobbers, asm_input_p)
      tree cv_qualifier;
      tree string;
      tree output_operands;
      tree input_operands;
      tree clobbers;
+     int asm_input_p;
 {
   if (cv_qualifier != NULL_TREE
       && cv_qualifier != ridpointers[(int) RID_VOLATILE])
@@ -733,15 +734,12 @@ genrtl_asm_stmt (cv_qualifier, string, output_operands,
     }
 
   emit_line_note (input_filename, lineno);
-  if (output_operands != NULL_TREE || input_operands != NULL_TREE
-      || clobbers != NULL_TREE)
-      c_expand_asm_operands (string, output_operands,
-			     input_operands, 
-			     clobbers,
-			     cv_qualifier != NULL_TREE,
-			     input_filename, lineno);
-  else
+  if (asm_input_p)
     expand_asm (string);
+  else
+    c_expand_asm_operands (string, output_operands, input_operands, 
+			   clobbers, cv_qualifier != NULL_TREE,
+			   input_filename, lineno);
 }
 
 /* Generate the RTL for a DECL_CLEANUP. */
@@ -842,7 +840,8 @@ expand_stmt (t)
 
 	case ASM_STMT:
 	  genrtl_asm_stmt (ASM_CV_QUAL (t), ASM_STRING (t),
-			   ASM_OUTPUTS (t), ASM_INPUTS (t), ASM_CLOBBERS (t));
+			   ASM_OUTPUTS (t), ASM_INPUTS (t),
+			   ASM_CLOBBERS (t), ASM_INPUT_P (t));
 	  break;
 
 	case SCOPE_STMT:

gcc/cp/ChangeLog

+2001-01-02  Richard Henderson  <rth@redhat.com>
+
+	* parse.y (asm): Set ASM_INPUT_P.
+
 2001-01-02  Jason Merrill  <jason@redhat.com>
 
 	* tree.c (cp_valid_lang_attribute): Don't set CLASSTYPE_COM_INTERFACE

gcc/cp/parse.y

 /* YACC parser for C++ syntax.
    Copyright (C) 1988, 1989, 1993, 1994, 1995, 1996, 1997, 1998,
-   1999, 2000 Free Software Foundation, Inc.
+   1999, 2000, 2001 Free Software Foundation, Inc.
    Hacked by Michael Tiemann (tiemann@cygnus.com)
 
 This file is part of GNU CC.
@@ -3398,7 +3398,8 @@ simple_stmt:
                 { $$ = finish_return_stmt ($2); }
 	| asm_keyword maybe_cv_qualifier '(' string ')' ';'
 		{ $$ = finish_asm_stmt ($2, $4, NULL_TREE, NULL_TREE,
-					NULL_TREE); }
+					NULL_TREE);
+		  ASM_INPUT_P ($$) = 1; }
 	/* This is the case with just output operands.  */
 	| asm_keyword maybe_cv_qualifier '(' string ':' asm_operands ')' ';'
 		{ $$ = finish_asm_stmt ($2, $4, $6, NULL_TREE, NULL_TREE); }

gcc/testsuite/gcc.dg/asm-2.c

+/* { dg-do compile } */
+/* { dg-options "" } */
+
+int f()
+{
+  asm volatile ("foo%%bar" : : );
+}
+
+/* { dg-final { scan-assembler asm-2.c "foo%bar" } } */

gcc/testsuite/gcc.dg/asm-3.c

+/* { dg-do compile } */
+/* { dg-options "" } */
+
+int f()
+{
+  asm ("foo%%bar");
+}
+
+/* { dg-final { scan-assembler asm-3.c "foo%%bar" } } */