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[mono] Use correct cast_class for IntPtr[] #103841

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merged 7 commits into from
Jun 26, 2024
Merged

[mono] Use correct cast_class for IntPtr[] #103841

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8d3cbd0
[mono] Use correct cast_class for IntPtr[]
steveisok Jun 21, 2024
4cabf4c
Merge remote-tracking branch 'upstream/main' into fix-intptr-cast
steveisok Jun 24, 2024
0cb529d
Add test
steveisok Jun 25, 2024
45323c5
Fix hasty stuff
steveisok Jun 25, 2024
ae4a5e9
Losing it a bit ;-)
steveisok Jun 25, 2024
ea60e34
it's x0 instead of x
steveisok Jun 25, 2024
4facff1
I guess test methods need to be static
steveisok Jun 26, 2024
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10 changes: 3 additions & 7 deletions src/mono/mono/metadata/class-init.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1039,18 +1039,14 @@ class_composite_fixup_cast_class (MonoClass *klass, gboolean for_ptr)
case MONO_TYPE_U2:
klass->cast_class = mono_defaults.int16_class;
break;
case MONO_TYPE_U4:
#if TARGET_SIZEOF_VOID_P == 4
case MONO_TYPE_I:
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MONO_TYPE_BOOLEAN -> byte_class normalization above looks suspect as well. I do not think regular CoreCLR does normalization like that anywhere.

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@lambdageek lambdageek Jun 24, 2024 •
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@jkotas I think the bool -> int8 fixup comes from when I misread I.8.7.2:

A location type T is compatible-with a location type U if and only if one of the following holds.

  1. T and U are not managed pointer types and T is compatible-with U according to the definition in §I.8.7.1.
  2. T and U are both managed pointer types and T is pointer-element-compatible-with U.
    A managed pointer type T is pointer-element-compatible-with a managed pointer type U if and
    only if T has verification type V and U has verification type W and V is identical to W.

The verification type of a bool is defined in I.8.7 as

  1. If the reduced type of T is:
    a. int8 or bool, then its verification type is int8.

The problem is I think I applied the verification type rules to unmanaged pointer types (ie bool*) rather than to managed pointer types (ie bool&)

case MONO_TYPE_U:
#endif
klass->cast_class = mono_defaults.int_class;
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break;
case MONO_TYPE_U4:
klass->cast_class = mono_defaults.int32_class;
break;
case MONO_TYPE_U8:
#if TARGET_SIZEOF_VOID_P == 8
case MONO_TYPE_I:
case MONO_TYPE_U:
#endif
klass->cast_class = mono_defaults.int64_class;
break;
default:
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20 changes: 20 additions & 0 deletions src/tests/Loader/classloader/Casting/Normalization.cs
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@@ -0,0 +1,20 @@
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System;
using System.Runtime.InteropServices;

using Xunit;

public class NormalizationTests
{
[Fact]
public static void IntPtrArrayNormalization()
{
object x0 = new long[1];
object x1 = new ulong[1];

Assert.False(x0 is IntPtr[]);
Assert.False(x1 is IntPtr[]);
}
}
5 changes: 5 additions & 0 deletions src/tests/Loader/classloader/Casting/Normalization.csproj
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@@ -0,0 +1,5 @@
<Project Sdk="Microsoft.NET.Sdk">
<ItemGroup>
<Compile Include="Normalization.cs" />
</ItemGroup>
</Project>
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