[gcc r13-8557] Fortran: set shape of initializers of zero-sized arrays [PR95374, PR104352]

[Harald Anlauf via Gcc-cvs]

https://gcc.gnu.org/g:0dd82c0fba660775ff76ae27077a67f2f1358920

commit r13-8557-g0dd82c0fba660775ff76ae27077a67f2f1358920
Author: Harald Anlauf <anl...@gmx.de>
Date:   Wed May 17 20:39:18 2023 +0200

    Fortran: set shape of initializers of zero-sized arrays [PR95374,PR104352]
    
    gcc/fortran/ChangeLog:
    
            PR fortran/95374
            PR fortran/104352
            * decl.cc (add_init_expr_to_sym): Set shape of initializer also for
            zero-sized arrays, so that bounds violations can be detected later.
    
    gcc/testsuite/ChangeLog:
    
            PR fortran/95374
            PR fortran/104352
            * gfortran.dg/zero_sized_13.f90: New test.
    
    (cherry picked from commit 7bafe652dba9167b65e7b5ef24e77eceb49709ba)

Diff:
---
 gcc/fortran/decl.cc                         |  3 +--
 gcc/testsuite/gfortran.dg/zero_sized_13.f90 | 28 ++++++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/gcc/fortran/decl.cc b/gcc/fortran/decl.cc
index 03e993eb0ff..527e84ad763 100644
--- a/gcc/fortran/decl.cc
+++ b/gcc/fortran/decl.cc
@@ -2248,8 +2248,7 @@ add_init_expr_to_sym (const char *name, gfc_expr **initp, 
locus *var_locus)
              && gfc_is_constant_expr (init)
              && (init->expr_type == EXPR_CONSTANT
                  || init->expr_type == EXPR_STRUCTURE)
-             && spec_size (sym->as, &size)
-             && mpz_cmp_si (size, 0) > 0)
+             && spec_size (sym->as, &size))
            {
              array = gfc_get_array_expr (init->ts.type, init->ts.kind,
                                          &init->where);
diff --git a/gcc/testsuite/gfortran.dg/zero_sized_13.f90 
b/gcc/testsuite/gfortran.dg/zero_sized_13.f90
new file mode 100644
index 00000000000..4035d458b32
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/zero_sized_13.f90
@@ -0,0 +1,28 @@
+! { dg-do compile }
+! { dg-options "-w" }
+!
+! PR fortran/95374
+! PR fortran/104352 - Various ICEs for bounds violation with zero-sized arrays
+!
+! Contributed by G. Steinmetz
+
+program p
+  implicit none
+  integer :: i
+  integer, parameter :: a(0)    = 0
+  integer, parameter :: b(0:-5) = 0
+  integer, parameter :: c(*) = [(a(i:i), i=0,0)] ! { dg-error "out of bounds" }
+  integer, parameter :: d(*) = [(b(i:i), i=1,1)] ! { dg-error "out of bounds" }
+  integer, parameter :: e(1) = [(a(i)  , i=1,1)] ! { dg-error "out of bounds" }
+  integer, parameter :: f(1) = [(a(i:i), i=1,1)] ! { dg-error "out of bounds" }
+  integer            :: g(1) = [(a(i:i), i=0,0)] ! { dg-error "out of bounds" }
+  integer            :: h(1) = [(a(i:i), i=1,1)] ! { dg-error "out of bounds" }
+  print *, [(a(i:i), i=0,0)] ! { dg-error "out of bounds" }
+  print *, [(a(i:i), i=1,1)] ! { dg-error "out of bounds" }
+  print *, any (a(1:1) == 1) ! { dg-error "out of bounds" }
+  print *, all (a(0:0) == 1) ! { dg-error "out of bounds" }
+  print *, sum (a(1:1))      ! { dg-error "out of bounds" }
+  print *, iall (a(0:0))     ! { dg-error "out of bounds" }
+  print *, minloc (a(0:0),1) ! { dg-error "out of bounds" }
+  print *, dot_product(a(1:1),a(1:1)) ! { dg-error "out of bounds" }
+end