re PR middle-end/85488 (segmentation fault when compiling code using the ordered(n) clause in OpenMP 4.5)

PR middle-end/85488
	PR middle-end/87649
	* omp-low.c (check_omp_nesting_restrictions): Diagnose ordered without
	depend closely nested inside of loop with ordered clause with
	a parameter.

	* c-c++-common/gomp/doacross-2.c: New test.
	* c-c++-common/gomp/sink-3.c: Expect another error during error
	recovery.

From-SVN: r265335

gcc/ChangeLog

@@ -1,3 +1,11 @@
+2018-10-19  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/85488
+	PR middle-end/87649
+	* omp-low.c (check_omp_nesting_restrictions): Diagnose ordered without
+	depend closely nested inside of loop with ordered clause with
+	a parameter.
+
 2018-10-19  David Malcolm  <dmalcolm@redhat.com>
 
 	* Makefile.in (TEXI_GCCINT_FILES): Add ux.texi.

gcc/omp-low.c

@@ -2762,14 +2762,25 @@ check_omp_nesting_restrictions (gimple *stmt, omp_context *ctx)
 	  case GIMPLE_OMP_FOR:
 	    if (gimple_omp_for_kind (ctx->stmt) == GF_OMP_FOR_KIND_TASKLOOP)
 	      goto ordered_in_taskloop;
-	    if (omp_find_clause (gimple_omp_for_clauses (ctx->stmt),
-				 OMP_CLAUSE_ORDERED) == NULL)
+	    tree o;
+	    o = omp_find_clause (gimple_omp_for_clauses (ctx->stmt),
+				 OMP_CLAUSE_ORDERED);
+	    if (o == NULL)
 	      {
 		error_at (gimple_location (stmt),
 			  "%<ordered%> region must be closely nested inside "
 			  "a loop region with an %<ordered%> clause");
 		return false;
 	      }
+	    if (OMP_CLAUSE_ORDERED_EXPR (o) != NULL_TREE
+		&& omp_find_clause (c, OMP_CLAUSE_DEPEND) == NULL_TREE)
+	      {
+		error_at (gimple_location (stmt),
+			  "%<ordered%> region without %<depend%> clause may "
+			  "not be closely nested inside a loop region with "
+			  "an %<ordered%> clause with a parameter");
+		return false;
+	      }
 	    return true;
 	  case GIMPLE_OMP_TARGET:
 	    if (gimple_omp_target_kind (ctx->stmt)

gcc/testsuite/ChangeLog

@@ -1,3 +1,11 @@
+2018-10-19  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/85488
+	PR middle-end/87649
+	* c-c++-common/gomp/doacross-2.c: New test.
+	* c-c++-common/gomp/sink-3.c: Expect another error during error
+	recovery.
+
 2018-10-19  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	* gcc.target/powerpc/safe-indirect-jump-2.c: Do not check assigned CR

gcc/testsuite/c-c++-common/gomp/doacross-2.c

@@ -0,0 +1,49 @@
+/* PR middle-end/87649 */
+
+void
+foo (void)
+{
+  int i;
+  #pragma omp for ordered(1)
+  for (i = 0; i < 64; i++)
+    {
+      #pragma omp ordered			/* { dg-error "'ordered' region without 'depend' clause may not be closely nested inside a loop region with an 'ordered' clause with a parameter" } */
+      ;
+    }
+  #pragma omp for ordered(1)
+  for (i = 0; i < 64; i++)
+    {
+      #pragma omp ordered threads		/* { dg-error "'ordered' region without 'depend' clause may not be closely nested inside a loop region with an 'ordered' clause with a parameter" } */
+      ;
+    }
+}
+
+void
+bar (void)
+{
+  int i;
+  #pragma omp for ordered
+  for (i = 0; i < 64; i++)
+    {
+      #pragma omp ordered depend(source)	/* { dg-error "'ordered' construct with 'depend' clause must be closely nested inside a loop with 'ordered' clause with a parameter" } */
+      #pragma omp ordered depend(sink: i - 1)	/* { dg-error "'ordered' construct with 'depend' clause must be closely nested inside a loop with 'ordered' clause with a parameter" } */
+    }
+  #pragma omp for
+  for (i = 0; i < 64; i++)
+    {
+      #pragma omp ordered depend(source)	/* { dg-error "'ordered' construct with 'depend' clause must be closely nested inside a loop with 'ordered' clause with a parameter" } */
+      #pragma omp ordered depend(sink: i - 1)	/* { dg-error "'ordered' construct with 'depend' clause must be closely nested inside a loop with 'ordered' clause with a parameter" } */
+    }
+  #pragma omp for
+  for (i = 0; i < 64; i++)
+    {
+      #pragma omp ordered			/* { dg-error "'ordered' region must be closely nested inside a loop region with an 'ordered' clause" } */
+      ;
+    }
+  #pragma omp for
+  for (i = 0; i < 64; i++)
+    {
+      #pragma omp ordered threads		/* { dg-error "'ordered' region must be closely nested inside a loop region with an 'ordered' clause" } */
+      ;
+    }
+}

gcc/testsuite/c-c++-common/gomp/sink-3.c

@@ -14,7 +14,7 @@ foo ()
   for (i=0; i < 100; ++i)
     {
 #pragma omp ordered depend(sink:poo-1,paa+1) /* { dg-error "poo.*declared.*paa.*declared" } */
-    bar(&i);
+    bar(&i);				     /* { dg-error "may not be closely nested" "" { target *-*-* } .-1 } */
 #pragma omp ordered depend(source)
     }
 }