For actual arguments whose dummy is INTENT(OUT), we used to generate
clobbers on them at the same time we generated the argument reference
for the function call. This was wrong if for an argument coming
later, the value expression was depending on the value of the just-
clobbered argument, and we passed an undefined value in that case.
With this change, clobbers are collected separatedly and appended
to the procedure call preliminary code after all the arguments have been
evaluated.
PR fortran/106817
gcc/fortran/ChangeLog:
* trans-expr.cc (gfc_conv_procedure_call): Collect all clobbers
to their own separate block. Append the block of clobbers to
the procedure preliminary block after the argument evaluation
codes for all the arguments.
gcc/testsuite/ChangeLog:
* gfortran.dg/intent_optimize_9.f90: New test.
---
gcc/fortran/trans-expr.cc | 6 ++-
.../gfortran.dg/intent_optimize_9.f90 | 43 +++++++++++++++++++
2 files changed, 47 insertions(+), 2 deletions(-)
create mode 100644 gcc/testsuite/gfortran.dg/intent_optimize_9.f90
@@ -6018,7 +6018,6 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
gfc_charlen cl;
gfc_expr *e;
gfc_symbol *fsym;
- stmtblock_t post;
enum {MISSING = 0, ELEMENTAL, SCALAR, SCALAR_POINTER, ARRAY};
gfc_component *comp = NULL;
int arglen;
@@ -6062,7 +6061,9 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
else
info = NULL;
+ stmtblock_t post, clobbers;
gfc_init_block (&post);
+ gfc_init_block (&clobbers);
gfc_init_interface_mapping (&mapping);
if (!comp)
{
@@ -6531,7 +6532,7 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
var = build_fold_indirect_ref_loc (input_location,
parmse.expr);
tree clobber = build_clobber (TREE_TYPE (var));
- gfc_add_modify (&se->pre, var, clobber);
+ gfc_add_modify (&clobbers, var, clobber);
}
}
/* Catch base objects that are not variables. */
@@ -7400,6 +7401,7 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
vec_safe_push (arglist, parmse.expr);
}
+ gfc_add_block_to_block (&se->pre, &clobbers);
gfc_finish_interface_mapping (&mapping, &se->pre, &se->post);
if (comp)
new file mode 100644
@@ -0,0 +1,43 @@
+! { dg-do run }
+! { dg-additional-options "-fdump-tree-original" }
+! { dg-final { scan-tree-dump-times "CLOBBER" 2 "original" } }
+!
+! PR fortran/106817
+! Check that for an actual argument whose dummy is INTENT(OUT),
+! the clobber that is emitted in the caller before a procedure call
+! happens after any expression depending on the argument value has been
+! evaluated.
+!
+
+module m
+ implicit none
+contains
+ subroutine copy1(out, in)
+ integer, intent(in) :: in
+ integer, intent(out) :: out
+ out = in
+ end subroutine copy1
+ subroutine copy2(in, out)
+ integer, intent(in) :: in
+ integer, intent(out) :: out
+ out = in
+ end subroutine copy2
+end module m
+
+program p
+ use m
+ implicit none
+ integer :: a, b
+
+ ! Clobbering of a should happen after a+1 has been evaluated.
+ a = 3
+ call copy1(a, a+1)
+ if (a /= 4) stop 1
+
+ ! Clobbering order does not depend on the order of arguments.
+ ! It should also come last with reversed arguments.
+ b = 12
+ call copy2(b+1, b)
+ if (b /= 13) stop 2
+
+end program p