1 /*
   2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.graalvm.compiler.hotspot.stubs;
  24 
  25 import org.graalvm.compiler.api.replacements.Snippet;
  26 import org.graalvm.compiler.api.replacements.Snippet.ConstantParameter;
  27 import org.graalvm.compiler.debug.GraalError;
  28 import org.graalvm.compiler.hotspot.HotSpotForeignCallLinkage;
  29 import org.graalvm.compiler.hotspot.meta.HotSpotProviders;
  30 
  31 import jdk.vm.ci.code.Register;
  32 
  33 /**
  34  * Stub to allocate a {@link NullPointerException} thrown by a bytecode.
  35  */
  36 public class NullPointerExceptionStub extends CreateExceptionStub {
  37 
  38     public NullPointerExceptionStub(HotSpotProviders providers, HotSpotForeignCallLinkage linkage) {
  39         super("createNullPointerException", providers, linkage);
  40     }
  41 
  42     @Override
  43     protected Object getConstantParameterValue(int index, String name) {
  44         GraalError.guarantee(index == 0, "unknown parameter %s at index %d", name, index);
  45         return providers.getRegisters().getThreadRegister();
  46     }
  47 
  48     @Snippet
  49     private static Object createNullPointerException(@ConstantParameter Register threadRegister) {
  50         return createException(threadRegister, NullPointerException.class);
  51     }
  52 }