re PR fortran/32732 ([Bind C] Character scalars are passed as arrays)

2007-07-23  Christopher D. Rickett  <crickett@lanl.gov>

       PR fortran/32732
       * trans-decl.c (generate_local_decl): Convert the TREE_TYPE for by
       value character dummy args of BIND(C) procedures.
       * trans-expr.c (gfc_conv_variable): Do not build address
       expression for BT_CHARACTER dummy args.

2007-07-23  Christopher D. Rickett  <crickett@lanl.gov>

       PR fortran/32732
       * gfortran.dg/c_char_tests.f03: New test case.
       * gfortran.dg/c_char_driver.c: Driver for c_char_tests.f03.
       * gfortran.dg/c_char_tests_2.f03: New test case.
       * gfortran.dg/value_6.f03: Ditto.
       * gfortran.dg/value_7.f03: Ditto.

From-SVN: r126836

gcc/fortran/ChangeLog

 2007-07-23  Christopher D. Rickett  <crickett@lanl.gov>
+
+	PR fortran/32732
+	* trans-decl.c (generate_local_decl): Convert the TREE_TYPE for by
+	value character dummy args of BIND(C) procedures.
+	* trans-expr.c (gfc_conv_variable): Do not build address
+	expression for BT_CHARACTER dummy args.
+
+2007-07-23  Christopher D. Rickett  <crickett@lanl.gov>
 	    Tobias Burnus  <burnus@net-b.de>
 
 	PR fortran/32600

gcc/fortran/trans-decl.c

@@ -3018,6 +3018,19 @@ generate_local_decl (gfc_symbol * sym)
 		     &sym->declared_at);
     }
 
+  if (sym->attr.dummy == 1)
+    {
+      /* Modify the tree type for scalar character dummy arguments of bind(c)
+	 procedures if they are passed by value.  The tree type for them will
+	 be promoted to INTEGER_TYPE for the middle end, which appears to be
+	 what C would do with characters passed by-value.  The value attribute
+         implies the dummy is a scalar.  */
+      if (sym->attr.value == 1 && sym->backend_decl != NULL
+	  && sym->ts.type == BT_CHARACTER && sym->ts.is_c_interop
+	  && sym->ns->proc_name != NULL && sym->ns->proc_name->attr.is_bind_c)
+	TREE_TYPE (sym->backend_decl) = unsigned_char_type_node;
+    }
+
   /* Make sure we convert the types of the derived types from iso_c_binding
      into (void *).  */
   if (sym->attr.flavor != FL_PROCEDURE && sym->attr.is_iso_c

gcc/fortran/trans-expr.c

@@ -472,11 +472,6 @@ gfc_conv_variable (gfc_se * se, gfc_expr * expr)
 		  || sym->attr.result))
 	    se->expr = build_fold_indirect_ref (se->expr);
 
-	  /* A character with VALUE attribute needs an address
-	     expression.  */
-	  if (sym->attr.value)
-	    se->expr = build_fold_addr_expr (se->expr);
-
 	}
       else if (!sym->attr.value)
 	{

gcc/testsuite/ChangeLog

 2007-07-23  Christopher D. Rickett  <crickett@lanl.gov>
 
+	PR fortran/32732
+	* gfortran.dg/c_char_tests.f03: New test case.
+	* gfortran.dg/c_char_driver.c: Driver for c_char_tests.f03.
+	* gfortran.dg/c_char_tests_2.f03: New test case.
+	* gfortran.dg/value_6.f03: Ditto.
+	* gfortran.dg/value_7.f03: Ditto.
+
+2007-07-23  Christopher D. Rickett  <crickett@lanl.gov>
+
 	PR fortran/32600
 	* gfortran.dg/c_funloc_tests_5.f03: New.
 	* gfortran.dg/c_funloc_tests_5.f04: New.

gcc/testsuite/gfortran.dg/c_char_driver.c

+void param_test(char my_char, char my_char_2);
+void sub0(void);
+void sub1(char *my_char);
+
+int main(int argc, char **argv)
+{
+  char my_char = 'y';
+  
+  param_test('y', 'z');
+  sub0();
+  sub1(&my_char);
+  
+  return 0;
+}

gcc/testsuite/gfortran.dg/c_char_tests.f03

+! { dg-do run }
+! { dg-additional-sources c_char_driver.c }
+! Verify that character dummy arguments for bind(c) procedures can work both 
+! by-value and by-reference when called by either C or Fortran.
+! PR fortran/32732
+module c_char_tests
+  use, intrinsic :: iso_c_binding, only: c_char
+  implicit none
+contains
+  subroutine param_test(my_char, my_char_2) bind(c)
+    character(c_char), value :: my_char
+    character(c_char), value :: my_char_2
+    if(my_char /= c_char_'y') call abort()
+    if(my_char_2 /= c_char_'z') call abort()
+    
+    call sub1(my_char)
+  end subroutine param_test
+
+  subroutine sub0() bind(c)
+    call param_test('y', 'z')
+  end subroutine sub0
+
+  subroutine sub1(my_char_ref) bind(c)
+    character(c_char) :: my_char_ref
+    if(my_char_ref /= c_char_'y') call abort()
+  end subroutine sub1
+end module c_char_tests
+
+! { dg-final { cleanup-modules "c_char_tests" } }

gcc/testsuite/gfortran.dg/c_char_tests_2.f03

+! { dg-do run }
+! Verify that the changes made to character dummy arguments for bind(c) 
+! procedures doesn't break non-bind(c) routines.
+! PR fortran/32732
+subroutine bar(a)
+  use, intrinsic :: iso_c_binding, only: c_char
+  character(c_char), value :: a
+  if(a /= c_char_'a') call abort()
+end subroutine bar
+
+subroutine bar2(a)
+  use, intrinsic :: iso_c_binding, only: c_char
+  character(c_char) :: a
+  if(a /= c_char_'a') call abort()
+end subroutine bar2
+
+use iso_c_binding
+implicit none
+interface
+  subroutine bar(a)
+    import
+    character(c_char),value :: a
+  end subroutine bar
+  subroutine bar2(a)
+    import
+    character(c_char) :: a
+  end subroutine bar2
+end interface
+ character(c_char) :: z
+ z = 'a'
+ call bar(z)
+ call bar2(z)
+end

gcc/testsuite/gfortran.dg/value_6.f03

+! { dg-do run }
+! Verify by-value passing of character arguments w/in Fortran to a bind(c) 
+! procedure.  
+! PR fortran/32732
+module pr32732
+  use, intrinsic :: iso_c_binding, only: c_char
+  implicit none
+contains
+  subroutine test(a) bind(c)
+    character(kind=c_char), value :: a
+    call test2(a)
+  end subroutine test
+  subroutine test2(a) bind(c)
+    character(kind=c_char), value :: a
+    if(a /= c_char_'a') call abort ()
+    print *, 'a=',a
+  end subroutine test2
+end module pr32732
+
+program main
+  use pr32732
+  implicit none
+  call test('a')
+end program main
+! { dg-final { cleanup-modules "pr32732" } }

gcc/testsuite/gfortran.dg/value_7.f03

+! { dg-do run }
+! Test passing character strings by-value.
+! PR fortran/32732
+program test
+  implicit none
+  character(len=13) :: chr
+  chr =  'Fortran       '
+  call sub1(chr)
+  if(chr /= 'Fortran       ') call abort()
+contains
+  subroutine sub1(a)
+    character(len=13), VALUE :: a
+    a = trim(a)//" rules"
+    call sub2(a)        
+  end subroutine sub1
+  subroutine sub2(a)
+    character(len=13), VALUE :: a
+    print *, a          
+    if(a /= 'Fortran rules') call abort()
+  end subroutine sub2
+end program test
+