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 */
23package org.graalvm.compiler.hotspot.stubs;
24
25import org.graalvm.compiler.api.replacements.Snippet;
26import org.graalvm.compiler.api.replacements.Snippet.ConstantParameter;
27import org.graalvm.compiler.debug.GraalError;
28import org.graalvm.compiler.hotspot.HotSpotForeignCallLinkage;
29import org.graalvm.compiler.hotspot.meta.HotSpotProviders;
30import org.graalvm.compiler.hotspot.nodes.AllocaNode;
31import org.graalvm.compiler.options.OptionValues;
32import org.graalvm.compiler.word.Word;
33
34import jdk.vm.ci.code.Register;
35
36/**
37 * Stub to allocate an {@link ArrayIndexOutOfBoundsException} thrown by a bytecode.
38 */
39public class OutOfBoundsExceptionStub extends CreateExceptionStub {
40
41    public OutOfBoundsExceptionStub(OptionValues options, HotSpotProviders providers, HotSpotForeignCallLinkage linkage) {
42        super("createOutOfBoundsException", options, providers, linkage);
43    }
44
45    private static final int MAX_INT_STRING_SIZE = Integer.toString(Integer.MIN_VALUE).length();
46
47    @Override
48    protected Object getConstantParameterValue(int index, String name) {
49        switch (index) {
50            case 1:
51                return providers.getRegisters().getThreadRegister();
52            case 2:
53                int wordSize = providers.getWordTypes().getWordKind().getByteCount();
54                // (MAX_INT_STRING_SIZE + 1) / wordSize, rounded up
55                return MAX_INT_STRING_SIZE / wordSize + 1;
56            default:
57                throw GraalError.shouldNotReachHere("unknown parameter " + name + " at index " + index);
58        }
59    }
60
61    @Snippet
62    private static Object createOutOfBoundsException(int idx, @ConstantParameter Register threadRegister, @ConstantParameter int bufferSizeInWords) {
63        Word buffer = AllocaNode.alloca(bufferSizeInWords);
64
65        long number = idx;
66        if (number < 0) {
67            number = -number;
68        }
69
70        Word ptr = buffer.add(MAX_INT_STRING_SIZE);
71        ptr.writeByte(0, (byte) 0);
72        do {
73            long digit = number % 10;
74            number /= 10;
75
76            ptr = ptr.subtract(1);
77            ptr.writeByte(0, (byte) ('0' + digit));
78        } while (number > 0);
79
80        if (idx < 0) {
81            ptr = ptr.subtract(1);
82            ptr.writeByte(0, (byte) '-');
83        }
84
85        return createException(threadRegister, ArrayIndexOutOfBoundsException.class, ptr);
86    }
87}
88