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 import org.graalvm.compiler.hotspot.nodes.AllocaNode;
  31 import org.graalvm.compiler.word.Word;
  32 
  33 import jdk.vm.ci.code.Register;
  34 
  35 /**
  36  * Stub to allocate an {@link ArrayIndexOutOfBoundsException} thrown by a bytecode.
  37  */
  38 public class OutOfBoundsExceptionStub extends CreateExceptionStub {
  39 
  40     public OutOfBoundsExceptionStub(HotSpotProviders providers, HotSpotForeignCallLinkage linkage) {
  41         super("createOutOfBoundsException", providers, linkage);
  42     }
  43 
  44     private static final int MAX_INT_STRING_SIZE = Integer.toString(Integer.MIN_VALUE).length();
  45 
  46     @Override
  47     protected Object getConstantParameterValue(int index, String name) {
  48         switch (index) {
  49             case 1:
  50                 return providers.getRegisters().getThreadRegister();
  51             case 2:
  52                 int wordSize = providers.getWordTypes().getWordKind().getByteCount();
  53                 // (MAX_INT_STRING_SIZE + 1) / wordSize, rounded up
  54                 return MAX_INT_STRING_SIZE / wordSize + 1;
  55             default:
  56                 throw GraalError.shouldNotReachHere("unknown parameter " + name + " at index " + index);
  57         }
  58     }
  59 
  60     @Snippet
  61     private static Object createOutOfBoundsException(int idx, @ConstantParameter Register threadRegister, @ConstantParameter int bufferSizeInWords) {
  62         Word buffer = AllocaNode.alloca(bufferSizeInWords);
  63 
  64         long number = idx;
  65         if (number < 0) {
  66             number = -number;
  67         }
  68 
  69         Word ptr = buffer.add(MAX_INT_STRING_SIZE);
  70         ptr.writeByte(0, (byte) 0);
  71         do {
  72             long digit = number % 10;
  73             number /= 10;
  74 
  75             ptr = ptr.subtract(1);
  76             ptr.writeByte(0, (byte) ('0' + digit));
  77         } while (number > 0);
  78 
  79         if (idx < 0) {
  80             ptr = ptr.subtract(1);
  81             ptr.writeByte(0, (byte) '-');
  82         }
  83 
  84         return createException(threadRegister, ArrayIndexOutOfBoundsException.class, ptr);
  85     }
  86 }