gfortran.h (gfc_isym_id): Add GFC_ISYM_CAF_GET and GFC_ISYM_CAF_SEND.

2014-05-08  Tobias Burnus  <burnus@net-b.de>

        * gfortran.h (gfc_isym_id): Add GFC_ISYM_CAF_GET
        and GFC_ISYM_CAF_SEND.
        * intrinsic.c (add_functions): Add only internally
        accessible caf_get and caf_send functions.
        * resolve.c (add_caf_get_intrinsic,
        remove_caf_get_intrinsic): New functions.
        (resolve_variable): Resolve expression rank and
        prepare for add_caf_get_intrinsic call.
        (gfc_resolve_expr): For variables, remove rank
        resolution.
        (resolve_ordinary_assign): Prepare call to
        GFC_ISYM_CAF_SEND.
        (resolve_code): Avoid call to GFC_ISYM_CAF_GET for
        the LHS of an assignment.

From-SVN: r210225

4 files changed, 115 insertions, 8 deletions

diff --git a/gcc/fortran/ChangeLog b/gcc/fortran/ChangeLog
index 6c9477f..45c09a1 100644
--- a/gcc/fortran/ChangeLog
+++ b/gcc/fortran/ChangeLog
@@ -1,5 +1,22 @@
 2014-05-08  Tobias Burnus  <burnus@net-b.de>
 
+	* gfortran.h (gfc_isym_id): Add GFC_ISYM_CAF_GET
+	and GFC_ISYM_CAF_SEND.
+	* intrinsic.c (add_functions): Add only internally
+	accessible caf_get and caf_send functions.
+	* resolve.c (add_caf_get_intrinsic,
+	remove_caf_get_intrinsic): New functions.
+	(resolve_variable): Resolve expression rank and
+	prepare for add_caf_get_intrinsic call.
+	(gfc_resolve_expr): For variables, remove rank
+	resolution.
+	(resolve_ordinary_assign): Prepare call to
+	GFC_ISYM_CAF_SEND.
+	(resolve_code): Avoid call to GFC_ISYM_CAF_GET for
+	the LHS of an assignment.
+
+2014-05-08  Tobias Burnus  <burnus@net-b.de>
+
 	* trans-intrinsic.c (conv_co_minmaxsum): Change condition style.
 
 2014-05-08  Tobias Burnus  <burnus@net-b.de>
diff --git a/gcc/fortran/gfortran.h b/gcc/fortran/gfortran.h
index 63be8af..d654d2b 100644
--- a/gcc/fortran/gfortran.h
+++ b/gcc/fortran/gfortran.h
@@ -318,6 +318,8 @@ enum gfc_isym_id
   GFC_ISYM_BLE,
   GFC_ISYM_BLT,
   GFC_ISYM_BTEST,
+  GFC_ISYM_CAF_GET,
+  GFC_ISYM_CAF_SEND,
   GFC_ISYM_CEILING,
   GFC_ISYM_CHAR,
   GFC_ISYM_CHDIR,
diff --git a/gcc/fortran/intrinsic.c b/gcc/fortran/intrinsic.c
index 852ae92..4c2eaa5 100644
--- a/gcc/fortran/intrinsic.c
+++ b/gcc/fortran/intrinsic.c
@@ -2756,7 +2756,7 @@ add_functions (void)
   make_generic ("size", GFC_ISYM_SIZE, GFC_STD_F95);
 
   /* Obtain the stride for a given dimensions; to be used only internally.
-     "make_from_module" makes inaccessible for external users.  */
+     "make_from_module" makes it inaccessible for external users.  */
   add_sym_2 (GFC_PREFIX ("stride"), GFC_ISYM_STRIDE, CLASS_INQUIRY, ACTUAL_NO,
 	     BT_INTEGER, gfc_index_integer_kind, GFC_STD_GNU,
 	     NULL, NULL, gfc_resolve_stride,
@@ -2994,6 +2994,13 @@ add_functions (void)
 	     x, BT_UNKNOWN, 0, REQUIRED);
 		
   make_generic ("loc", GFC_ISYM_LOC, GFC_STD_GNU);
+
+  /* The following function is internally used for coarray libray functions.
+     "make_from_module" makes it inaccessible for external users.  */
+  add_sym_1 (GFC_PREFIX ("caf_get"), GFC_ISYM_CAF_GET, CLASS_IMPURE, ACTUAL_NO,
+	     BT_REAL, dr, GFC_STD_GNU, NULL, NULL, NULL,
+	     x, BT_REAL, dr, REQUIRED);
+  make_from_module();
 }
 
 
@@ -3235,6 +3242,15 @@ add_subroutines (void)
 	      stat, BT_INTEGER, di, OPTIONAL, INTENT_OUT,
 	      errmsg, BT_CHARACTER, dc, OPTIONAL, INTENT_OUT);
 
+  /* The following subroutine is internally used for coarray libray functions.
+     "make_from_module" makes it inaccessible for external users.  */
+  add_sym_2s (GFC_PREFIX ("caf_send"), GFC_ISYM_CAF_SEND, CLASS_IMPURE,
+	      BT_UNKNOWN, 0, GFC_STD_GNU, NULL, NULL, NULL,
+	      "x", BT_REAL, dr, REQUIRED, INTENT_OUT,
+	      "y", BT_REAL, dr, REQUIRED, INTENT_IN);
+  make_from_module();
+
+
   /* More G77 compatibility garbage.  */
   add_sym_3s ("alarm", GFC_ISYM_ALARM, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_alarm_sub, NULL, gfc_resolve_alarm_sub,
diff --git a/gcc/fortran/resolve.c b/gcc/fortran/resolve.c
index 15c9463..241b85e 100644
--- a/gcc/fortran/resolve.c
+++ b/gcc/fortran/resolve.c
@@ -4730,6 +4730,50 @@ done:
 }
 
 
+static void
+add_caf_get_intrinsic (gfc_expr *e)
+{
+  gfc_expr *wrapper, *tmp_expr;
+  gfc_ref *ref;
+  int n;
+
+  for (ref = e->ref; ref; ref = ref->next)
+    if (ref->type == REF_ARRAY && ref->u.ar.codimen > 0)
+      break;
+  if (ref == NULL)
+    return;
+
+  for (n = ref->u.ar.dimen; n < ref->u.ar.dimen + ref->u.ar.codimen; n++)
+    if (ref->u.ar.dimen_type[n] != DIMEN_ELEMENT)
+      return;
+
+  tmp_expr = XCNEW (gfc_expr);
+  *tmp_expr = *e;
+  wrapper = gfc_build_intrinsic_call (gfc_current_ns, GFC_ISYM_CAF_GET,
+				      "caf_get", tmp_expr->where, 1, tmp_expr);
+  wrapper->ts = e->ts;
+  wrapper->rank = e->rank;
+  if (e->rank)
+    wrapper->shape = gfc_copy_shape (e->shape, e->rank);
+  *e = *wrapper;
+  free (wrapper);
+}
+
+
+static void
+remove_caf_get_intrinsic (gfc_expr *e)
+{
+  gcc_assert (e->expr_type == EXPR_FUNCTION && e->value.function.isym
+	      && e->value.function.isym->id == GFC_ISYM_CAF_GET);
+  gfc_expr *e2 = e->value.function.actual->expr;
+  e->value.function.actual->expr =NULL;
+  gfc_free_actual_arglist (e->value.function.actual);
+  gfc_free_shape (&e->shape, e->rank);
+  *e = *e2;
+  free (e2);
+}
+
+
 /* Resolve a variable expression.  */
 
 static bool
@@ -5009,6 +5053,12 @@ resolve_procedure:
 	}
     }
 
+  if (t)
+    expression_rank (e);
+
+  if (0 && t && gfc_option.coarray == GFC_FCOARRAY_LIB && gfc_is_coindexed (e))
+    add_caf_get_intrinsic (e);
+
   return t;
 }
 
@@ -6092,11 +6142,7 @@ gfc_resolve_expr (gfc_expr *e)
       if (check_host_association (e))
 	t = resolve_function (e);
       else
-	{
-	  t = resolve_variable (e);
-	  if (t)
-	    expression_rank (e);
-	}
+	t = resolve_variable (e);
 
       if (e->ts.type == BT_CHARACTER && e->ts.u.cl == NULL && e->ref
 	  && e->ref->type != REF_SUBSTRING)
@@ -9214,8 +9260,10 @@ resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
       return false;
     }
 
+  bool lhs_coindexed = gfc_is_coindexed (lhs);
+
   /* F2008, Section 7.2.1.2.  */
-  if (gfc_is_coindexed (lhs) && gfc_has_ultimate_allocatable (lhs))
+  if (lhs_coindexed && gfc_has_ultimate_allocatable (lhs))
     {
       gfc_error ("Coindexed variable must not have an allocatable ultimate "
 		 "component in assignment at %L", &lhs->where);
@@ -9223,6 +9271,25 @@ resolve_ordinary_assign (gfc_code *code, gfc_namespace *ns)
     }
 
   gfc_check_assign (lhs, rhs, 1);
+
+  if (0 && lhs_coindexed && gfc_option.coarray == GFC_FCOARRAY_LIB)
+    {
+      code->op = EXEC_CALL;
+      gfc_get_sym_tree (GFC_PREFIX ("caf_send"), ns, &code->symtree, true);
+      code->resolved_sym = code->symtree->n.sym;
+      code->resolved_sym->attr.flavor = FL_PROCEDURE;
+      code->resolved_sym->attr.intrinsic = 1;
+      code->resolved_sym->attr.subroutine = 1;
+      code->resolved_isym = gfc_intrinsic_subroutine_by_id (GFC_ISYM_CAF_SEND);
+      gfc_commit_symbol (code->resolved_sym);
+      code->ext.actual = gfc_get_actual_arglist ();
+      code->ext.actual->expr = lhs;
+      code->ext.actual->next = gfc_get_actual_arglist ();
+      code->ext.actual->next->expr = rhs;
+      code->expr1 = NULL;
+      code->expr2 = NULL;
+    }
+
   return false;
 }
 
@@ -9845,6 +9912,11 @@ resolve_code (gfc_code *code, gfc_namespace *ns)
 	  if (!t)
 	    break;
 
+	  if (code->expr1->expr_type == EXPR_FUNCTION
+	      && code->expr1->value.function.isym
+	      && code->expr1->value.function.isym->id == GFC_ISYM_CAF_GET)
+	    remove_caf_get_intrinsic (code->expr1);
+
 	  if (!gfc_check_vardef_context (code->expr1, false, false, false, 
 					 _("assignment")))
 	    break;
@@ -9858,7 +9930,7 @@ resolve_code (gfc_code *code, gfc_namespace *ns)
 	    }
 
 	  /* F03 7.4.1.3 for non-allocatable, non-pointer components.  */
-	  if (code->expr1->ts.type == BT_DERIVED
+	  if (code->op != EXEC_CALL && code->expr1->ts.type == BT_DERIVED
 	      && code->expr1->ts.u.derived->attr.defined_assign_comp)
 	    generate_component_assignments (&code, ns);