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[Fortran] PR 52469

Message ID 4F58BE75.3010201@net-b.de
State New
Headers show

Commit Message

Tobias Burnus March 8, 2012, 2:13 p.m. UTC 
After a lengthy debugging, I finally found the issue. If I hadn't be 
concentrating that much on -fwhole-file and if I had had a closer look 
at the test case before, I hadn't wasted hours tracking this one down ...

The problem is that a procedure pointer is used for the "interface" of a 
procedure-pointer component. Instead of using the tree declaration of 
the proc-pointer target, the proc-pointer declaration was used as type - 
which caused a mess. (The patch is clearer than what I wrote above.)

As the test case in the PR works without -fwhole-file (which enabled by 
default since 4.6), it is a 4.6/4.7/4.8 regression.

Build and regtested on x86-64-Linux.
OK for the trunk and the 4.6 and 4.7* branch? (* for 4.7.1)

Tobias

PS: The regtesting shows two unrelated failures: 
gfortran.dg/lto/pr45586-2 (PR fortran/45586) and 
gfortran.dg/realloc_on_assign_5.f03 (PR fortran/47674).

PPS: Other patches which still need to be reviewed:
* Cleanup fortran/convert.c, 
http://gcc.gnu.org/ml/fortran/2012-03/msg00036.html
* Allow displaying backtraces from user code, 
http://gcc.gnu.org/ml/fortran/2012-03/msg00028.html
* gfortran testsuite: implicitly cleanup-modules, 
http://gcc.gnu.org/ml/fortran/2012-03/msg00000.html
* libfortran RFC: Shared vtables, constification, 
http://gcc.gnu.org/ml/fortran/2012-02/msg00067.html

Comments

Mikael Morin March 8, 2012, 7:11 p.m. UTC | #1 
On 08/03/2012 15:13, Tobias Burnus wrote:
> After a lengthy debugging, I finally found the issue. If I hadn't be
> concentrating that much on -fwhole-file and if I had had a closer look
> at the test case before, I hadn't wasted hours tracking this one down ...
> 
> The problem is that a procedure pointer is used for the "interface" of a
> procedure-pointer component. Instead of using the tree declaration of
> the proc-pointer target, the proc-pointer declaration was used as type -
> which caused a mess. (The patch is clearer than what I wrote above.)
> 
> As the test case in the PR works without -fwhole-file (which enabled by
> default since 4.6), it is a 4.6/4.7/4.8 regression.
> 
> Build and regtested on x86-64-Linux.
> OK for the trunk and the 4.6 and 4.7* branch? (* for 4.7.1)
> 
Rather obvious (once the fix is known ;-)). OK. Thanks.

Mikael.
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Patch

2012-03-08  Tobias Burnus  <burnus@net-b.de>

	PR fortran/52469
	* trans-types.c (gfc_get_function_type): Handle backend_decl
	of a procedure pointer.

2012-03-08  Tobias Burnus  <burnus@net-b.de>

	PR fortran/52469
	* gfortran.dg/proc_ptr_34.f90

diff --git a/gcc/fortran/trans-types.c b/gcc/fortran/trans-types.c
index 6ff1d33..32fa2f4 100644
--- a/gcc/fortran/trans-types.c
+++ b/gcc/fortran/trans-types.c
@@ -2678,7 +2692,11 @@  gfc_get_function_type (gfc_symbol * sym)
 	      || sym->attr.flavor == FL_PROGRAM);
 
   if (sym->backend_decl)
-    return TREE_TYPE (sym->backend_decl);
+    {
+      if (sym->attr.proc_pointer)
+	return TREE_TYPE (TREE_TYPE (sym->backend_decl));
+      return TREE_TYPE (sym->backend_decl);
+    }
 
   alternate_return = 0;
   typelist = NULL;
--- /dev/null	2012-03-08 07:42:36.287801550 +0100
+++ gcc/gcc/testsuite/gfortran.dg/proc_ptr_34.f90	2012-03-08 13:55:21.000000000 +0100
@@ -0,0 +1,79 @@ 
+! { dg-do compile }
+!
+! PR fortran/52469
+!
+! This was failing as the DECL of the proc pointer "func"
+! was used for the interface of the proc-pointer component "my_f_ptr"
+! rather than the decl of the proc-pointer target
+!
+! Contributed by palott@gmail.com
+!
+
+module ExampleFuncs
+  implicit none
+
+  ! NOTE: "func" is a procedure pointer!
+  pointer :: func
+  interface
+     function func (z)
+        real :: func
+        real, intent (in) :: z
+     end function func
+  end interface
+
+  type Contains_f_ptr
+     procedure (func), pointer, nopass :: my_f_ptr
+  end type Contains_f_ptr
+contains
+
+function f1 (x)
+  real :: f1
+  real, intent (in) :: x
+
+  f1 = 2.0 * x
+
+  return
+end function f1
+
+function f2 (x)
+   real :: f2
+   real, intent (in) :: x
+
+   f2 = 3.0 * x**2
+
+   return
+end function f2
+
+function fancy (func, x)
+   real :: fancy
+   real, intent (in) :: x
+
+   interface AFunc
+      function func (y)
+         real :: func
+         real, intent (in) ::y
+      end function func
+   end interface AFunc
+
+   fancy = func (x) + 3.3 * x
+end function fancy
+
+end module  ExampleFuncs
+
+
+program test_proc_ptr
+  use ExampleFuncs
+  implicit none
+
+  type (Contains_f_ptr), dimension (2) :: NewType
+ 
+  !NewType(1) % my_f_ptr => f1
+  NewType(2) % my_f_ptr => f2
+
+  !write (*, *) NewType(1) % my_f_ptr (3.0), NewType(2) % my_f_ptr (3.0)
+  write (6, *)  NewType(2) % my_f_ptr (3.0) ! < Shall print '27.0'
+
+  stop
+end program test_proc_ptr
+
+! { dg-final { cleanup-modules "examplefuncs" } }