OpenMP/Fortran: Fix handling of optional is_device_ptr + bind(C) [PR108546]

For is_device_ptr, optional checks should only be done before calling
libgomp, afterwards they are NULL either because of absent or, by
chance, because it is unallocated or unassociated (for pointers/allocatables).

Additionally, it fixes an issue with explicit mapping for 'type(c_ptr)'.

	PR middle-end/108546

gcc/fortran/ChangeLog:

	* trans-openmp.cc (gfc_trans_omp_clauses): Fix mapping of
	type(C_ptr) variables.

gcc/ChangeLog:

	* omp-low.cc (lower_omp_target): Remove optional handling
	on the receiver side, i.e. inside target (data), for
	use_device_ptr.

libgomp/ChangeLog:

	* testsuite/libgomp.fortran/is_device_ptr-3.f90: New test.
	* testsuite/libgomp.fortran/use_device_ptr-optional-4.f90: New test.

(cherry picked from commit 96ff97ff6574666a5509ae9fa596e7f2b6ad4f88)

2 files changed, 99 insertions, 0 deletions

diff --git a/libgomp/testsuite/libgomp.fortran/is_device_ptr-3.f90 b/libgomp/testsuite/libgomp.fortran/is_device_ptr-3.f90
new file mode 100644
index 0000000..ab9f00e
--- /dev/null
+++ b/libgomp/testsuite/libgomp.fortran/is_device_ptr-3.f90
@@ -0,0 +1,46 @@
+module m
+   use iso_c_binding
+   implicit none
+contains
+   subroutine s(x,y,z)
+      type(c_ptr), optional :: x
+      integer, pointer, optional :: y
+      integer, allocatable, optional :: z
+      logical is_present, is_null
+      is_present = present(x)
+      if (is_present) &
+        is_null = .not. c_associated(x)
+
+      !$omp target is_device_ptr(x) has_device_addr(y) has_device_addr(z)
+        if (is_present) then
+          if (is_null) then
+            if (c_associated(x)) stop 1
+            if (associated(y)) stop 2
+            if (allocated(z)) stop 3
+          else
+            if (.not. c_associated(x, c_loc(y))) stop 4
+            if (y /= 7) stop 5
+            if (z /= 9) stop 6
+          end if
+        end if
+      !$omp end target
+   end
+end
+
+use m
+implicit none
+integer, pointer :: p
+integer, allocatable :: a
+p => null()
+call s()
+!$omp target data map(p,a) use_device_addr(p,a)
+  call s(c_null_ptr, p, a)
+!$omp end target data
+allocate(p,a)
+p = 7
+a = 9
+!$omp target data map(p,a) use_device_addr(p,a)
+  call s(c_loc(p), p, a)
+!$omp end target data
+deallocate(p,a)
+end
diff --git a/libgomp/testsuite/libgomp.fortran/use_device_ptr-optional-4.f90 b/libgomp/testsuite/libgomp.fortran/use_device_ptr-optional-4.f90
new file mode 100644
index 0000000..b2a5c31
--- /dev/null
+++ b/libgomp/testsuite/libgomp.fortran/use_device_ptr-optional-4.f90
@@ -0,0 +1,53 @@
+! PR middle-end/108546
+!
+module m
+   use iso_c_binding
+   implicit none
+   type(c_ptr) :: p2, p3
+contains
+   subroutine s(x,y,z)
+      type(c_ptr), optional :: x
+      integer, pointer, optional :: y
+      integer, allocatable, optional, target :: z
+      logical is_present, is_null
+      is_present = present(x)
+      if (is_present) &
+        is_null = .not. c_associated(x)
+
+      !$omp target data use_device_ptr(x) use_device_addr(y) use_device_addr(z)
+        if (is_present) then
+          if (is_null) then
+            if (c_associated(x)) stop 1
+            if (associated(y)) stop 2
+            if (allocated(z)) stop 3
+          else
+            if (.not. c_associated(x, p2)) stop 4
+            if (.not. c_associated(c_loc(y), p2)) stop 5
+            if (.not. c_associated(c_loc(z), p3)) stop 6
+          end if
+        end if
+      !$omp end target data
+   end
+end
+
+use m
+implicit none
+type(c_ptr) :: cp
+integer, pointer :: p
+integer, allocatable, target :: a
+call s()
+p => null()
+call s(c_null_ptr, p, a)
+allocate(p,a)
+p = 7
+a = 9
+cp = c_loc(p)
+!$omp target enter data map(to: cp, p, a)
+!$omp target map(from: p2, p3)
+  p2 = c_loc(p)
+  p3 = c_loc(a)
+!$omp end target
+call s(cp, p, a)
+!$omp target exit data map(delete: cp, p, a)
+deallocate(p,a)
+end