open acc default data attribute

[Nathan Sidwell <nathan@acm.org>]

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Jakub,
this patch implements default data attribute determination.  The current 
behaviour defaults to 'copy' and ignores 'default(none)'. The  patch corrects that.

1) We emit a diagnostic when 'default(none)' is in effect.  The fortran FE emits 
some artificial decls that it doesn't otherwise annotate, which is why we check 
DECL_ARTIFICIAL.  IIUC Cesar had a patch to address that but it needed some 
reworking?

2) 'copy' is the correct default for 'kernels' regions, but for a 'parallel' 
region, scalars should be 'firstprivate', which is what this patch implements.

ok?

nathan

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2015-11-11  Nathan Sidwell  <nathan@codesourcery.com>

	gcc/
	* gimplify.c (oacc_default_clause): New.
	(omp_notice_variable): Call it.

	gcc/testsuite/
	* c-c++-common/goacc/data-default-1.c: New.

	libgomp/
	* testsuite/libgomp.oacc-c-c++-common/default-1.c: New.

Index: gcc/gimplify.c
===================================================================
--- gcc/gimplify.c	(revision 230169)
+++ gcc/gimplify.c	(working copy)
@@ -5900,6 +5900,60 @@ omp_default_clause (struct gimplify_omp_
   return flags;
 }
 
+
+/* Determine outer default flags for DECL mentioned in an OACC region
+   but not declared in an enclosing clause.  */
+
+static unsigned
+oacc_default_clause (struct gimplify_omp_ctx *ctx, tree decl, unsigned flags)
+{
+  const char *rkind;
+
+  switch (ctx->region_type)
+    {
+    default:
+      gcc_unreachable ();
+
+    case ORT_ACC_KERNELS:
+      /* Everything under kernels are default 'present_or_copy'.  */
+      flags |= GOVD_MAP;
+      rkind = "kernels";
+      break;
+
+    case ORT_ACC_PARALLEL:
+      {
+	tree type = TREE_TYPE (decl);
+
+	if (TREE_CODE (type) == REFERENCE_TYPE
+	    || POINTER_TYPE_P (type))
+	  type = TREE_TYPE (type);
+
+	if (AGGREGATE_TYPE_P (type))
+	  /* Aggregates default to 'present_or_copy'.  */
+	  flags |= GOVD_MAP;
+	else
+	  /* Scalars default to 'firstprivate'.  */
+	  flags |= GOVD_FIRSTPRIVATE;
+	rkind = "parallel";
+      }
+      break;
+    }
+
+  if (DECL_ARTIFICIAL (decl))
+    ; /* We can get compiler-generated decls, and should not complain
+	 about them.  */
+  else if (ctx->default_kind == OMP_CLAUSE_DEFAULT_NONE)
+    {
+      error ("%qE not specified in enclosing OpenACC %s construct",
+	     DECL_NAME (lang_hooks.decls.omp_report_decl (decl)), rkind);
+      error_at (ctx->location, "enclosing OpenACC %s construct", rkind);
+    }
+  else
+    gcc_checking_assert (ctx->default_kind == OMP_CLAUSE_DEFAULT_SHARED);
+
+  return flags;
+}
+
 /* Record the fact that DECL was used within the OMP context CTX.
    IN_CODE is true when real code uses DECL, and false when we should
    merely emit default(none) errors.  Return true if DECL is going to
@@ -6023,7 +6077,12 @@ omp_notice_variable (struct gimplify_omp
 		nflags |= GOVD_MAP | GOVD_EXPLICIT;
 	      }
 	    else if (nflags == flags)
-	      nflags |= GOVD_MAP;
+	      {
+		if ((ctx->region_type & ORT_ACC) != 0)
+		  nflags = oacc_default_clause (ctx, decl, flags);
+		else
+		  nflags |= GOVD_MAP;
+	      }
 	  }
 	found_outer:
 	  omp_add_variable (ctx, decl, nflags);
Index: gcc/testsuite/c-c++-common/goacc/data-default-1.c
===================================================================
--- gcc/testsuite/c-c++-common/goacc/data-default-1.c	(revision 0)
+++ gcc/testsuite/c-c++-common/goacc/data-default-1.c	(working copy)
@@ -0,0 +1,37 @@
+/* { dg-do compile } */
+
+
+int main ()
+{
+  int n = 2;
+  int ary[2];
+  
+#pragma acc parallel default (none) /* { dg-message "parallel construct" 2 } */
+  {
+    ary[0] /* { dg-error "not specified in enclosing" } */
+      = n; /* { dg-error "not specified in enclosing" } */
+  }
+
+#pragma acc kernels default (none) /* { dg-message "kernels construct" 2 } */
+  {
+    ary[0] /* { dg-error "not specified in enclosing" } */
+      = n; /* { dg-error "not specified in enclosing" } */
+  }
+
+#pragma acc data copy (ary, n)
+  {
+#pragma acc parallel default (none)
+    {
+      ary[0]
+	= n;
+    }
+
+#pragma acc kernels default (none)
+    {
+      ary[0]
+	= n;
+    }
+  }
+
+  return 0;
+}
Index: libgomp/testsuite/libgomp.oacc-c-c++-common/default-1.c
===================================================================
--- libgomp/testsuite/libgomp.oacc-c-c++-common/default-1.c	(revision 0)
+++ libgomp/testsuite/libgomp.oacc-c-c++-common/default-1.c	(working copy)
@@ -0,0 +1,87 @@
+/* { dg-do run } */
+
+#include  <openacc.h>
+
+int test_parallel ()
+{
+  int ok = 1;
+  int val = 2;
+  int ary[32];
+  int ondev = 0;
+
+  for (int i = 0; i < 32; i++)
+    ary[i] = ~0;
+
+  /* val defaults to firstprivate, ary defaults to copy.  */
+#pragma acc parallel num_gangs (32) copy (ok) copy(ondev)
+  {
+    ondev = acc_on_device (acc_device_not_host);
+#pragma acc loop gang(static:1)
+    for (unsigned i = 0; i < 32; i++)
+      {
+	if (val != 2)
+	  ok = 0;
+	val += i;
+	ary[i] = val;
+      }
+  }
+
+  if (ondev)
+    {
+      if (!ok)
+	return 1;
+      if (val != 2)
+	return 1;
+
+      for (int i = 0; i < 32; i++)
+	if (ary[i] != 2 + i)
+	  return 1;
+    }
+  
+  return 0;
+}
+
+int test_kernels ()
+{
+  int val = 2;
+  int ary[32];
+  int ondev = 0;
+
+  for (int i = 0; i < 32; i++)
+    ary[i] = ~0;
+
+  /* val defaults to copy, ary defaults to copy.  */
+#pragma acc kernels copy(ondev)
+  {
+    ondev = acc_on_device (acc_device_not_host);
+#pragma acc loop 
+    for (unsigned i = 0; i < 32; i++)
+      {
+	ary[i] = val;
+	val++;
+      }
+  }
+
+  if (ondev)
+    {
+      if (val != 2 + 32)
+	return 1;
+
+      for (int i = 0; i < 32; i++)
+	if (ary[i] != 2 + i)
+	  return 1;
+    }
+  
+  return 0;
+}
+
+int main ()
+{
+  if (test_parallel ())
+    return 1;
+
+  if (test_kernels ())
+    return 1;
+
+  return 0;
+}