re PR fortran/32036 (Multiple evaluation of array index with bounds checking)

	PR fortran/32036

	* trans-array.c (gfc_conv_array_ref): Only evaluate index once.

	* gfortran.dg/bounds_check_8.f90: New test.
	* gfortran.dg/do_iterator_2.f90: Make code legal Fortran.

From-SVN: r126647

gcc/fortran/ChangeLog

 2007-07-15  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
 
+	PR fortran/32036
+	* trans-array.c (gfc_conv_array_ref): Only evaluate index once.
+
+2007-07-15  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
+
 	PR fortran/32357
 	* iresolve.c (gfc_resolve_mvbits): Convert FROMPOS, LEN and TOPOS
 	to C int.

gcc/fortran/trans-array.c

@@ -2278,6 +2278,9 @@ gfc_conv_array_ref (gfc_se * se, gfc_array_ref * ar, gfc_symbol * sym,
 	  tree cond;
 	  char *msg;
 
+	  /* Evaluate the indexse.expr only once.  */
+	  indexse.expr = save_expr (indexse.expr);
+
 	  /* Lower bound.  */
 	  tmp = gfc_conv_array_lbound (se->expr, n);
 	  cond = fold_build2 (LT_EXPR, boolean_type_node, 

gcc/testsuite/ChangeLog

 2007-07-15  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
 
+	PR fortran/32036
+	* gfortran.dg/bounds_check_8.f90: New test.
+	* gfortran.dg/do_iterator_2.f90: Make code legal Fortran.
+
+2007-07-15  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
+
 	PR fortran/32357
 	* gfortran.dg/mvbits_2.f90: New test.
 

gcc/testsuite/gfortran.dg/bounds_check_8.f90

+! { dg-do run }
+! { dg-options "-fbounds-check" }
+! PR fortran/32036
+program test
+  type t
+    integer, dimension (5) :: field
+  end type t
+  type (t), dimension (2) :: a
+  integer :: calls
+
+  type xyz_type
+     integer :: x
+  end type xyz_type
+  type (xyz_type), dimension(3) :: xyz
+  character(len=20) :: s
+
+  xyz(1)%x = 11111
+  xyz(2)%x = 0
+  xyz(3)%x = 0
+
+  write(s,*) xyz(bar())
+  if (trim(adjustl(s)) /= "11111") call abort
+
+  a(1)%field = 0
+  a(2)%field = 0
+  calls = 0
+  if (sum(a(foo(calls))%field) /= 0) call abort
+  if (calls .ne. 1) call abort
+
+contains
+
+  function foo (calls)
+    integer :: calls, foo
+    calls = calls + 1
+    foo = 2
+  end function foo 
+
+  integer function bar ()
+    integer, save :: i = 1
+    bar = i
+    i = i + 1
+  end function
+
+end program test

gcc/testsuite/gfortran.dg/do_iterator_2.f90

@@ -16,8 +16,8 @@ subroutine something
   i = 1
   n = 5
   line = 'PZ0R1'
-  if (internal (0)) call abort ()
-  if (m .ne. 5) call abort ()
+  if (internal (1)) call abort ()
+  if (m .ne. 4) call abort ()
 contains
   logical function internal (j)
     intent(in) j
@@ -25,7 +25,7 @@ contains
       k = index ('RE', lit (i))
       m = m + 1
       if (k == 0) cycle
-      if (i+1 == n) exit
+      if (i + 1 == n) exit
     enddo
     internal = (k == 0)
   end function