Fix potential ICE (null pointer dereference) in omp-low.c:diagnose_sb_0.

	gcc/
	* omp-low.c (diagnose_sb_0): Make sure label_ctx is valid to
	dereference.
	gcc/testsuite/
	* gcc.dg/cilk-plus/jump-openmp.c: New file.

From-SVN: r207722

gcc/ChangeLog

+2014-02-12  Thomas Schwinge  <thomas@codesourcery.com>
+
+	* omp-low.c (diagnose_sb_0): Make sure label_ctx is valid to
+	dereference.
+
 2014-02-12  James Greenhalgh  <james.greenhalgh@arm.com>
 
 	* config/arm/aarch-cost-tables.h (generic_extra_costs): Fix

gcc/omp-low.c

@@ -10269,7 +10269,8 @@ diagnose_sb_0 (gimple_stmt_iterator *gsi_p,
       if ((branch_ctx
 	   && gimple_code (branch_ctx) == GIMPLE_OMP_FOR
 	   && gimple_omp_for_kind (branch_ctx) == GF_OMP_FOR_KIND_CILKSIMD)
-	  || (gimple_code (label_ctx) == GIMPLE_OMP_FOR
+	  || (label_ctx
+	      && gimple_code (label_ctx) == GIMPLE_OMP_FOR
 	      && gimple_omp_for_kind (label_ctx) == GF_OMP_FOR_KIND_CILKSIMD))
 	cilkplus_block = true;
     }

gcc/testsuite/ChangeLog

+2014-02-12  Thomas Schwinge  <thomas@codesourcery.com>
+
+	* gcc.dg/cilk-plus/jump-openmp.c: New file.
+
 2014-02-12  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/60092

gcc/testsuite/gcc.dg/cilk-plus/jump-openmp.c

+/* { dg-do compile } */
+/* { dg-options "-fcilkplus -fopenmp" } */
+/* { dg-require-effective-target fopenmp } */
+
+int *a, *b, c;
+
+void foo()
+{
+#pragma simd
+  for (int i=0; i < 1000; ++i)
+    {
+      a[i] = b[i];
+      if (c == 5)
+	return; /* { dg-error "invalid branch to/from a Cilk Plus structured block" } */
+    }
+}
+
+void bar()
+{
+#pragma simd
+  for (int i=0; i < 1000; ++i)
+    {
+    lab:
+      a[i] = b[i];
+    }
+  if (c == 6)
+    goto lab; /* { dg-error "invalid entry to Cilk Plus structured block" } */
+}
+
+void baz()
+{
+  bad1:
+  #pragma omp parallel
+    goto bad1; /* { dg-error "invalid branch to/from an OpenMP structured block" } */
+
+  goto bad2; /* { dg-error "invalid entry to OpenMP structured block" } */
+  #pragma omp parallel
+    {
+      bad2: ;
+    }
+
+  #pragma omp parallel
+    {
+      int i;
+      goto ok1;
+      for (i = 0; i < 10; ++i)
+	{ ok1: break; }
+    }
+}