jit-builtins.c: Fix segfault on unsupported builtins

gcc/jit/ChangeLog:
	* jit-builtins.c
	(gcc::jit::recording::builtins_manager::get_builtin_function):
	Check for NULL return from make_builtin_function.
	(gcc::jit::recording::builtins_manager::make_builtin_function):
	Check for NULL return from get_type.

From-SVN: r218239

gcc/jit/ChangeLog

 2014-12-01  David Malcolm  <dmalcolm@redhat.com>
 
+	* jit-builtins.c
+	(gcc::jit::recording::builtins_manager::get_builtin_function):
+	Check for NULL return from make_builtin_function.
+	(gcc::jit::recording::builtins_manager::make_builtin_function):
+	Check for NULL return from get_type.
+
+2014-12-01  David Malcolm  <dmalcolm@redhat.com>
+
 	* jit-playback.c (gcc::jit::playback::context::compile): Move DSO
 	creation code into...
 	(gcc::jit::playback::context::convert_to_dso): New function.

gcc/jit/jit-builtins.c

@@ -160,8 +160,12 @@ builtins_manager::get_builtin_function (const char *name)
      the same id on a context give back the same object.  */
   if (!m_builtin_functions[builtin_id])
     {
-      m_builtin_functions[builtin_id] = make_builtin_function (builtin_id);
-      m_ctxt->record (m_builtin_functions[builtin_id]);
+      function *fn = make_builtin_function (builtin_id);
+      if (fn)
+	{
+	  m_builtin_functions[builtin_id] = fn;
+	  m_ctxt->record (fn);
+	}
     }
 
   return m_builtin_functions[builtin_id];
@@ -174,7 +178,10 @@ builtins_manager::make_builtin_function (enum built_in_function builtin_id)
 {
   const struct builtin_data& bd = builtin_data[builtin_id];
   enum jit_builtin_type type_id = bd.type;
-  function_type *func_type = get_type (type_id)->as_a_function_type ();
+  type *t = get_type (type_id);
+  if (!t)
+    return NULL;
+  function_type *func_type = t->as_a_function_type ();
   if (!func_type)
     return NULL;