Patchwork [Fortran] Coarray: Add "token" to the descriptor, use it for argument passing

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Submitter Tobias Burnus
Date July 22, 2011, 8:23 a.m.
Message ID <4E293385.1000507@net-b.de>
Download mbox | patch
Permalink /patch/106235/
State New
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Comments

Tobias Burnus - July 22, 2011, 8:23 a.m.
Dear all,

this patch continues a bit the project of argument passing with 
-fcoarray=lib. As a reminder: The coarray communication library uniquely 
identifies coarrays based on the token - and it needs to know the offset 
between the data you want and the base address of the coarray.

This patch adds a "token" element as last element in the descriptor such 
that is can be easily ignored when passing a descriptor to a noncoarray 
descriptor dummy.*

The patch additionally handles passing such an array to a nondescriptor 
coarray dummy.

Build and regtested on x86-64-linux.
OK for the trunk?

  * * *

Planned as in follow up patches:

* Actually setting the "token" variable in ALLOCATE. Daniel is working 
on that.
* Handling assumed-shape coarrays: Besides actually setting the "token", 
one also needs to ensure that the "offset" is properly passed. With 
nested assumed-shape calls, the "offset" issue also occurs when passing 
such a coarray to a nondescriptor coarray dummy. I am not yet sure 
whether this can be handled without adding another component 
("caf_offset") to the descriptor or whether it can be avoided by 
"misusing" other fields such as offset.

Tobias

(*) One currently simply passes the full array, but the planned proper 
way is to do a cast of the following form. However, as it works as is, 
fixing this will be of lower priority.

struct DescriptorRank * {ref-all} tmparray
            = (struct DescriptorRankCorank * {ref-all})&coarray;

Patch

2011-07-22  Tobias Burnus  <burnus@net-b.de>

	* trans-array.c (CAF_TOKEN_FIELD): New macro constant.
	(gfc_conv_descriptor_token): New function.
	* trans-array.h (gfc_conv_descriptor_token): New prototype.
	* trans-types.c (gfc_get_array_descriptor_base): For coarrays
	with -fcoarray=lib, append "void *token" to the array descriptor.
	* trans-expr.c (gfc_conv_procedure_call): Handle token and offset
	when passing a descriptor coarray to a nondescriptor dummy.

2011-07-22  Tobias Burnus  <burnus@net-b.de>

	* gfortran.dg/coarray_lib_token_2.f90: New.

diff --git a/gcc/fortran/trans-array.c b/gcc/fortran/trans-array.c
index b959b36..ff059a3 100644
--- a/gcc/fortran/trans-array.c
+++ b/gcc/fortran/trans-array.c
@@ -129,6 +129,7 @@  gfc_array_dataptr_type (tree desc)
 #define OFFSET_FIELD 1
 #define DTYPE_FIELD 2
 #define DIMENSION_FIELD 3
+#define CAF_TOKEN_FIELD 4
 
 #define STRIDE_SUBFIELD 0
 #define LBOUND_SUBFIELD 1
@@ -267,6 +268,24 @@  gfc_conv_descriptor_dimension (tree desc, tree dim)
   return tmp;
 }
 
+
+tree
+gfc_conv_descriptor_token (tree desc)
+{
+  tree type;
+  tree field;
+
+  type = TREE_TYPE (desc);
+  gcc_assert (GFC_DESCRIPTOR_TYPE_P (type));
+  gcc_assert (gfc_option.coarray == GFC_FCOARRAY_LIB);
+  field = gfc_advance_chain (TYPE_FIELDS (type), CAF_TOKEN_FIELD);
+  gcc_assert (field != NULL_TREE && TREE_TYPE (field) == prvoid_type_node);
+
+  return fold_build3_loc (input_location, COMPONENT_REF, TREE_TYPE (field),
+			  desc, field, NULL_TREE);
+}
+
+
 static tree
 gfc_conv_descriptor_stride (tree desc, tree dim)
 {
@@ -429,6 +448,7 @@  gfc_conv_shift_descriptor_lbound (stmtblock_t* block, tree desc,
 #undef OFFSET_FIELD
 #undef DTYPE_FIELD
 #undef DIMENSION_FIELD
+#undef CAF_TOKEN_FIELD
 #undef STRIDE_SUBFIELD
 #undef LBOUND_SUBFIELD
 #undef UBOUND_SUBFIELD
diff --git a/gcc/fortran/trans-array.h b/gcc/fortran/trans-array.h
index 75704ad..61f7042 100644
--- a/gcc/fortran/trans-array.h
+++ b/gcc/fortran/trans-array.h
@@ -143,6 +143,7 @@  tree gfc_conv_descriptor_dtype (tree);
 tree gfc_conv_descriptor_stride_get (tree, tree);
 tree gfc_conv_descriptor_lbound_get (tree, tree);
 tree gfc_conv_descriptor_ubound_get (tree, tree);
+tree gfc_conv_descriptor_token (tree);
 
 void gfc_conv_descriptor_data_set (stmtblock_t *, tree, tree);
 void gfc_conv_descriptor_offset_set (stmtblock_t *, tree, tree);
diff --git a/gcc/fortran/trans-expr.c b/gcc/fortran/trans-expr.c
index 7622910..b720e73 100644
--- a/gcc/fortran/trans-expr.c
+++ b/gcc/fortran/trans-expr.c
@@ -3395,48 +3395,62 @@  gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
       if (fsym && fsym->attr.codimension
 	  && gfc_option.coarray == GFC_FCOARRAY_LIB
 	  && !fsym->attr.allocatable && fsym->as->type != AS_ASSUMED_SHAPE
-	  && (e == NULL
-	      || GFC_DESCRIPTOR_TYPE_P (TREE_TYPE (get_tree_for_caf_expr (e)))))
-	  /* FIXME: Remove the "||" condition when coarray descriptors have a
-	     "token" component. This condition occurs when passing an alloc
-	      coarray or assumed-shape dummy to an explict-shape dummy.  */
+	  && e == NULL)
 	{
 	  /* Token and offset. */
 	  VEC_safe_push (tree, gc, stringargs, null_pointer_node);
 	  VEC_safe_push (tree, gc, stringargs,
 			 build_int_cst (gfc_array_index_type, 0));
-	  gcc_assert (fsym->attr.optional || e != NULL); /* FIXME: "||" cond.  */
+	  gcc_assert (fsym->attr.optional);
 	}
       else if (fsym && fsym->attr.codimension
 	       && !fsym->attr.allocatable && fsym->as->type != AS_ASSUMED_SHAPE
 	       && gfc_option.coarray == GFC_FCOARRAY_LIB)
 	{
 	  tree caf_decl, caf_type;
-	  tree offset;
+	  tree offset, tmp2;
 
           caf_decl = get_tree_for_caf_expr (e);
 	  caf_type = TREE_TYPE (caf_decl);
 
-	  gcc_assert (GFC_ARRAY_TYPE_P (caf_type)
-		      && GFC_TYPE_ARRAY_CAF_TOKEN (caf_type) != NULL_TREE);
+	  if (GFC_DESCRIPTOR_TYPE_P (caf_type))
+	    tmp = gfc_conv_descriptor_token (caf_decl);
+	  else
+	    {
+	      gcc_assert (GFC_ARRAY_TYPE_P (caf_type)
+			  && GFC_TYPE_ARRAY_CAF_TOKEN (caf_type) != NULL_TREE);
+	      tmp = GFC_TYPE_ARRAY_CAF_TOKEN (caf_type);
+	    }
 	  
-	  VEC_safe_push (tree, gc, stringargs,
-			 GFC_TYPE_ARRAY_CAF_TOKEN (caf_type));
+	  VEC_safe_push (tree, gc, stringargs, tmp);
 
-	  if (GFC_TYPE_ARRAY_CAF_OFFSET (caf_type) != NULL_TREE)
+	  if (GFC_DESCRIPTOR_TYPE_P (caf_type))
+	    offset = build_int_cst (gfc_array_index_type, 0);
+	  else if (GFC_TYPE_ARRAY_CAF_OFFSET (caf_type) != NULL_TREE)
 	    offset = GFC_TYPE_ARRAY_CAF_OFFSET (caf_type);
 	  else
 	    offset = build_int_cst (gfc_array_index_type, 0);
 
-	  gcc_assert (POINTER_TYPE_P (TREE_TYPE (caf_decl))
-		      && POINTER_TYPE_P (TREE_TYPE (parmse.expr)));
+	  if (GFC_DESCRIPTOR_TYPE_P (caf_type))
+	    tmp = gfc_conv_descriptor_data_get (caf_decl);
+	  else
+	    {
+	      gcc_assert (POINTER_TYPE_P (caf_type));
+	      tmp = caf_decl;
+	    }
+
+	  if (GFC_DESCRIPTOR_TYPE_P (TREE_TYPE (parmse.expr)))
+	    tmp2 = gfc_conv_descriptor_data_get (parmse.expr);
+	  else
+	    {
+	      gcc_assert (POINTER_TYPE_P (TREE_TYPE (parmse.expr)));
+	      tmp2 = parmse.expr;
+	    }
 
 	  tmp = fold_build2_loc (input_location, MINUS_EXPR,
                                  gfc_array_index_type,
-                                 fold_convert (gfc_array_index_type,
-					       parmse.expr),
-                                 fold_convert (gfc_array_index_type,
-					       caf_decl));
+                                 fold_convert (gfc_array_index_type, tmp2),
+                                 fold_convert (gfc_array_index_type, tmp));
 	  offset = fold_build2_loc (input_location, PLUS_EXPR,
 				    gfc_array_index_type, offset, tmp);
 
diff --git a/gcc/fortran/trans-types.c b/gcc/fortran/trans-types.c
index 01587eb..8a8ab5f 100644
--- a/gcc/fortran/trans-types.c
+++ b/gcc/fortran/trans-types.c
@@ -1664,6 +1664,14 @@  gfc_get_array_descriptor_base (int dimen, int codimen, bool restricted)
 				    arraytype, &chain);
   TREE_NO_WARNING (decl) = 1;
 
+  if (gfc_option.coarray == GFC_FCOARRAY_LIB && codimen)
+    {
+      decl = gfc_add_field_to_struct_1 (fat_type,
+					get_identifier ("token"),
+					prvoid_type_node, &chain);
+      TREE_NO_WARNING (decl) = 1;
+    }
+
   /* Finish off the type.  */
   gfc_finish_type (fat_type);
   TYPE_DECL_SUPPRESS_DEBUG (TYPE_STUB_DECL (fat_type)) = 1;
--- /dev/null	2011-07-22 07:25:31.139891427 +0200
+++ gcc/gcc/testsuite/gfortran.dg/coarray_lib_token_2.f90	2011-07-22 09:37:41.000000000 +0200
@@ -0,0 +1,91 @@ 
+! { dg-do compile }
+! { dg-options "-fcoarray=lib -fdump-tree-original" }
+!
+! Check whether TOKEN and OFFSET are correctly propagated
+! 
+
+program main
+  implicit none
+  type t
+    integer(4) :: a, b
+  end type t
+  integer, allocatable :: caf[:]
+  type(t), allocatable :: caf_dt[:]
+
+  allocate (caf[*])
+  allocate (caf_dt[*])
+
+  caf = 42
+  caf_dt = t (1,2)
+  call sub (caf, caf_dt%b)
+  print *,caf, caf_dt%b
+  if (caf /= -99 .or. caf_dt%b /= -101) call abort ()
+  call sub_opt ()
+  call sub_opt (caf)
+  if (caf /= 124) call abort ()
+contains
+
+  subroutine sub (x1, x2)
+    integer :: x1[*], x2[*]
+    call sub2 (x1, x2)
+  end subroutine sub
+
+  subroutine sub2 (y1, y2)
+    integer :: y1[*], y2[*]
+
+    print *, y1, y2
+    if (y1 /= 42 .or. y2 /= 2) call abort ()
+    y1 = -99
+    y2 = -101
+  end subroutine sub2
+
+  subroutine sub_opt (z)
+    integer, optional :: z[*]
+    if (present (z)) then
+      if (z /= -99) call abort ()
+      z = 124
+    end if
+  end subroutine sub_opt
+
+end program main
+
+! SCAN TREE DUMP AND CLEANUP
+!
+! PROTOTYPE 1:
+!
+! sub (integer(kind=4) * restrict x1, integer(kind=4) * restrict x2,
+!      void * restrict caf_token.4, integer(kind=8) caf_offset.5,
+!      void * restrict caf_token.6, integer(kind=8) caf_offset.7)
+!
+! { dg-final { scan-tree-dump-times "sub \\(integer.kind=4. . restrict x1, integer.kind=4. . restrict x2, void . restrict caf_token.\[0-9\]+, integer.kind=.. caf_offset.\[0-9\]+, void . restrict caf_token.\[0-9\]+, integer.kind=.. caf_offset.\[0-9\]+\\)" 1 "original"} }
+!
+! PROTOTYPE 2:
+!
+! sub2 (integer(kind=4) * restrict y1, integer(kind=4) * restrict y2,
+!       void * restrict caf_token.0, integer(kind=8) caf_offset.1,
+!       void * restrict caf_token.2, integer(kind=8) caf_offset.3)
+!
+! { dg-final { scan-tree-dump-times "sub2 \\(integer.kind=4. . restrict y1, integer.kind=4. . restrict y2, void . restrict caf_token.\[0-9\]+, integer.kind=.. caf_offset.\[0-9\]+, void . restrict caf_token.\[0-9\]+, integer.kind=.. caf_offset.\[0-9\]+\\)" 1 "original"} }
+!
+! CALL 1
+!
+!  sub ((integer(kind=4) *) caf.data, &((struct t * restrict) caf_dt.data)->b,
+!       caf.token, 0, caf_dt.token, 4);
+!
+! { dg-final { scan-tree-dump-times "sub \\(\[^,\]*caf.data, &\[^,\]*caf_dt.data.->b, caf.token, 0, caf_dt.token, 4\\)" 1 "original"} }
+!
+!  sub2 ((integer(kind=4) *) x1, (integer(kind=4) *) x2,
+!        caf_token.4, NON_LVALUE_EXPR <caf_offset.5>,
+!        caf_token.6, NON_LVALUE_EXPR <caf_offset.7>);
+!
+! { dg-final { scan-tree-dump-times "sub2 \\(\[^,\]*x1, \[^,\]*x2, caf_token.\[0-9]+, \[^,\]*caf_offset\[^,\]*, caf_token.\[0-9\]+, \[^,\]*caf_offset\[^,\]*\\)" 1 "original"} }
+!
+! CALL 3
+!
+! { dg-final { scan-tree-dump-times "sub_opt \\(0B, 0B, 0\\)" 1 "original"} }
+!
+! CALL 4
+!
+! { dg-final { scan-tree-dump-times "sub_opt \\(.integer.kind=4. .. caf.data, caf.token, 0\\)" 1 "original"} }
+!
+! { dg-final { cleanup-tree-dump "original" } }