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create an example to demonstrate program transformation
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| ! Original: | ||
| ! program contrived | ||
| ! implicit none | ||
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| ! type :: my_type | ||
| ! integer :: a | ||
| ! real, allocatable :: b(:) | ||
| ! end type | ||
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| ! type(my_type), allocatable :: c[:] | ||
| ! real :: d | ||
| ! integer :: i, me, neighbor | ||
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| ! me = this_image() | ||
| ! allocate(c[*]) | ||
| ! c%a = me | ||
| ! allocate(c%b(me)) | ||
| ! do i = 1, me | ||
| ! c%b(i) = i | ||
| ! end do | ||
| ! sync all | ||
| ! neighbor = me 1 | ||
| ! if (neighbor > num_images()) neighbor = 1 | ||
| ! d = c[neighbor]%b(neighbor) | ||
| ! sync all | ||
| ! deallocate(c) | ||
| ! print *, "On image ", me, ", got ", d | ||
| ! end program | ||
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| program contrived | ||
| use prif ! we'll need to use calls to prif to replace coarray features | ||
| use iso_c_binding ! many of the prif interfaces involve C interop features | ||
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| implicit none | ||
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| type :: my_type | ||
| integer :: a | ||
| real, pointer :: b(:) => null() | ||
| end type | ||
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| type(prif_coarray_handle) :: c_handle | ||
| type(my_type), pointer :: local_c | ||
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| real :: d | ||
| integer :: i, me, neighbor | ||
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| call prif_this_image_no_coarray(this_image=me) | ||
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| block | ||
| type(my_type) :: for_element_size | ||
| integer(c_int) :: num_images | ||
| type(c_ptr) :: allocated_memory | ||
| call prif_num_images(num_images) | ||
| call prif_allocate_coarray( & | ||
| lcobounds = [1_c_intmax_t], & | ||
| ucobounds = [int(num_images, c_intmax_t)], & | ||
| lbounds = [integer(c_intmax_t)::], & | ||
| ubounds = [integer(c_intmax_t)::], & | ||
| element_size = int(storage_size(for_element_size)/8, c_size_t), & | ||
| final_func = c_funloc(deallocate_components), & | ||
| coarray_handel = c_handle, & | ||
| allocated_memory = allocated_memory) | ||
| call c_f_pointer(cptr = allocated_memory, fptr = local_c) | ||
| call prif_set_context_data(c_handle, allocated_memory) | ||
| end block | ||
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| local_c%a = me | ||
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| block | ||
| type(c_ptr) :: allocated_memory | ||
| real :: for_element_size | ||
| call prif_allocate( & | ||
| size_in_bytes = int((storage_size(for_element_size)*me)/8, c_size_t), & | ||
| allocated_memory = allocated_memory) | ||
| call c_f_pointer(cptr = allocated_memory, fptr = local_c%b, shape = [me]) | ||
| end block | ||
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| do i = 1, me | ||
| c%b(i) = i | ||
| end do | ||
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| call prif_sync_all() | ||
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| neighbor = me 1 | ||
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| block | ||
| integer(c_int) :: num_images | ||
| call prif_num_images(num_images = num_images) | ||
| if (neighbor > num_images) neighbor = 1 | ||
| end block | ||
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| block | ||
| type(c_ptr) :: buffer | ||
| integer(c_size_t), parameter :: b_offset = 4_c_size_t ! compiler dependent | ||
| integer(c_intptr_t), target :: b_pointer | ||
| real, target :: rhs_temp | ||
| buffer = c_loc(b_pointer) | ||
| ! fetch address of allocatable array on other image | ||
| call prif_get( & | ||
| image_num = neighbor, & | ||
| coarray_handle = c_handle, & | ||
| offset = b_offset, & | ||
| current_image_buffer = buffer, & | ||
| size_in_bytes = int(storage_size(b_pointer)/8, c_size_t)) | ||
| ! calculate address of element we want to access | ||
| b_pointer = b_pointer (storage_size(rhs_temp)*neighbor)/8 | ||
| call prif_get_indirect( & | ||
| image_num = neighbor, & | ||
| remote_ptr = b_pointer, & | ||
| current_image_buffer = c_loc(rhs_temp), & | ||
| size_in_bytes = int(storage_size(rhs_temp)/8, c_size_t)) | ||
| d = rhs_temp | ||
| end block | ||
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| call prif_sync_all() | ||
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| call prif_deallocate_coarray([c_handle]) | ||
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| print *, "On image ", me, ", got ", d | ||
| contains | ||
| subroutine deallocate_components(handle, stat, errmsg) bind(C) | ||
| type(prif_coarray_handle), pointer, intent(in) :: handle | ||
| integer(c_int), intent(out) :: stat | ||
| character(len=:), intent(out), allocatable :: errmsg | ||
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| type(my_type), pointer :: coarray_var | ||
| type(c_ptr) :: context_data | ||
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| call prif_get_context_data(handle, context_data) | ||
| call c_f_pointer(cptr = context_data, fptr = coarray_var) | ||
| if (associated(coarray_var%b)) then | ||
| call prif_deallocate(c_loc(coarray_var%b), stat, errmsg_alloc=errmsg) | ||
| else | ||
| stat = 0 | ||
| errmsg = "" | ||
| end if | ||
| end subroutine | ||
| end program | ||
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