[gcc r9-9939] Fortran: reject simplifying TRANSFER for MOLD with storage size 0

[gcc r9-9939] Fortran: reject simplifying TRANSFER for MOLD with storage size 0

[Harald Anlauf]

https://gcc.gnu.org/g:2953e3d1b9b36b441f5a33d696760ed56742ee1e

commit r9-9939-g2953e3d1b9b36b441f5a33d696760ed56742ee1e
Author: Harald Anlauf <anlauf@gmx.de>
Date:   Tue Feb 1 23:33:24 2022 +0100

    Fortran: reject simplifying TRANSFER for MOLD with storage size 0
    
    gcc/fortran/ChangeLog:
    
            PR fortran/104311
            * check.c (gfc_calculate_transfer_sizes): Checks for case when
            storage size of SOURCE is greater than zero while the storage size
            of MOLD is zero and MOLD is an array shall not depend on SIZE.
    
    gcc/testsuite/ChangeLog:
    
            PR fortran/104311
            * gfortran.dg/transfer_simplify_15.f90: New test.
    
    (cherry picked from commit 4e4252db0348a7274663a892c3a96d3ed7702aff)

Diff:
---
 gcc/fortran/check.c                                |  2 +-
 gcc/testsuite/gfortran.dg/transfer_simplify_15.f90 | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/gcc/fortran/check.c b/gcc/fortran/check.c
index 8e0c8d974e5..3f5b057c0d4 100644
--- a/gcc/fortran/check.c
+++ b/gcc/fortran/check.c
@@ -5562,7 +5562,7 @@ gfc_calculate_transfer_sizes (gfc_expr *source, gfc_expr *mold, gfc_expr *size,
    * representation is not shorter than that of SOURCE.
    * If SIZE is present, the result is an array of rank one and size SIZE.
    */
-  if (result_elt_size == 0 && *source_size > 0 && !size
+  if (result_elt_size == 0 && *source_size > 0
       && (mold->expr_type == EXPR_ARRAY || mold->rank))
     {
       gfc_error ("%<MOLD%> argument of %<TRANSFER%> intrinsic at %L is an "
diff --git a/gcc/testsuite/gfortran.dg/transfer_simplify_15.f90 b/gcc/testsuite/gfortran.dg/transfer_simplify_15.f90
new file mode 100644
index 00000000000..cdbec97ae71
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/transfer_simplify_15.f90
@@ -0,0 +1,11 @@
+! { dg-do compile }
+! PR fortran/104311 - ICE out of memory
+! Contributed by G.Steinmetz
+
+program p
+  type t
+  end type
+  type(t) :: x(2)
+  print *, transfer(1,x,2)       ! { dg-error "shall not have storage size 0" }
+  print *, transfer(1,x,huge(1)) ! { dg-error "shall not have storage size 0" }
+end