diff options
author | Michal Strehovsky <michals@microsoft.com> | 2018-08-02 16:57:58 +0300 |
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committer | Michal Strehovsky <michals@microsoft.com> | 2018-08-02 16:57:58 +0300 |
commit | 684bb89d4abeaf71a291414d0b960c2a333c4428 (patch) | |
tree | 442c482357eb26b4a5d6b0acf756d489d175b115 /src | |
parent | 476627a87b0e348dab5872f6a4da59ff8dca3ca1 (diff) |
Allow illegal custom modifiers on generic constraints
Roslyn decided to do a breaking change to the ECMA-335 file format by generating an illegal custom modifier for the `unmanaged` constraint. The purpose of the modifier is to poison such types for old versions of the C# compiler (the modifier otherwise isn't necessary for the feature to work). This also poisons a lot of the .NET ecosystem too (breaking everything ranging from Mono to the C++/CLI compiler).
We need to update our stack to support this and unblock our customers.
[tfs-changeset: 1709243]
Diffstat (limited to 'src')
5 files changed, 27 insertions, 4 deletions
diff --git a/src/Common/src/Internal/Metadata/NativeFormat/Generator/SchemaDef.cs b/src/Common/src/Internal/Metadata/NativeFormat/Generator/SchemaDef.cs index d5da54db8..a6bb922ee 100644 --- a/src/Common/src/Internal/Metadata/NativeFormat/Generator/SchemaDef.cs +++ b/src/Common/src/Internal/Metadata/NativeFormat/Generator/SchemaDef.cs @@ -644,7 +644,7 @@ class SchemaDef new MemberDef("Flags", "GenericParameterAttributes"), new MemberDef("Kind", "GenericParameterKind"), new MemberDef("Name", "ConstantStringValue", MemberDefFlags.RecordRef | MemberDefFlags.Child), - new MemberDef("Constraints", TypeDefOrRefOrSpec, MemberDefFlags.List | MemberDefFlags.RecordRef | MemberDefFlags.EnumerateForHashCode), + new MemberDef("Constraints", TypeDefOrRefOrSpecOrMod, MemberDefFlags.List | MemberDefFlags.RecordRef | MemberDefFlags.EnumerateForHashCode), new MemberDef("CustomAttributes", "CustomAttribute", MemberDefFlags.List | MemberDefFlags.RecordRef | MemberDefFlags.Child), } ), diff --git a/src/Common/src/Internal/Metadata/NativeFormat/NativeFormatReaderGen.cs b/src/Common/src/Internal/Metadata/NativeFormat/NativeFormatReaderGen.cs index f068f31f9..9ade71970 100644 --- a/src/Common/src/Internal/Metadata/NativeFormat/NativeFormatReaderGen.cs +++ b/src/Common/src/Internal/Metadata/NativeFormat/NativeFormatReaderGen.cs @@ -4314,7 +4314,7 @@ namespace Internal.Metadata.NativeFormat } // Name internal ConstantStringValueHandle _name; - /// One of: TypeDefinition, TypeReference, TypeSpecification + /// One of: TypeDefinition, TypeReference, TypeSpecification, ModifiedType public HandleCollection Constraints { diff --git a/src/ILCompiler.MetadataWriter/src/Internal/Metadata/NativeFormat/Writer/NativeFormatWriterGen.cs b/src/ILCompiler.MetadataWriter/src/Internal/Metadata/NativeFormat/Writer/NativeFormatWriterGen.cs index d503e858e..d4e199c70 100644 --- a/src/ILCompiler.MetadataWriter/src/Internal/Metadata/NativeFormat/Writer/NativeFormatWriterGen.cs +++ b/src/ILCompiler.MetadataWriter/src/Internal/Metadata/NativeFormat/Writer/NativeFormatWriterGen.cs @@ -2807,7 +2807,8 @@ namespace Internal.Metadata.NativeFormat.Writer Debug.Assert(Constraints.TrueForAll(handle => handle == null || handle.HandleType == HandleType.TypeDefinition || handle.HandleType == HandleType.TypeReference || - handle.HandleType == HandleType.TypeSpecification)); + handle.HandleType == HandleType.TypeSpecification || + handle.HandleType == HandleType.ModifiedType)); writer.Write(Constraints); writer.Write(CustomAttributes); } // Save diff --git a/src/System.Private.Reflection.Core/src/System/Reflection/Runtime/General/MetadataReaderExtensions.NativeFormat.cs b/src/System.Private.Reflection.Core/src/System/Reflection/Runtime/General/MetadataReaderExtensions.NativeFormat.cs index 901d0f4ba..5896aa812 100644 --- a/src/System.Private.Reflection.Core/src/System/Reflection/Runtime/General/MetadataReaderExtensions.NativeFormat.cs +++ b/src/System.Private.Reflection.Core/src/System/Reflection/Runtime/General/MetadataReaderExtensions.NativeFormat.cs @@ -162,6 +162,24 @@ namespace System.Reflection.Runtime.General return customModifiers.ToArray(); } + public static Handle SkipCustomModifiers(this Handle handle, MetadataReader reader) + { + HandleType handleType = handle.HandleType; + Debug.Assert(handleType == HandleType.TypeDefinition || handleType == HandleType.TypeReference || handleType == HandleType.TypeSpecification || handleType == HandleType.ModifiedType); + if (handleType != HandleType.ModifiedType) + return handle; + + do + { + ModifiedType modifiedType = handle.ToModifiedTypeHandle(reader).GetModifiedType(reader); + handle = modifiedType.Type; + handleType = handle.HandleType; + } + while (handleType == HandleType.ModifiedType); + + return handle; + } + public static MethodSignature ParseMethodSignature(this Handle handle, MetadataReader reader) { return handle.ToMethodSignatureHandle(reader).GetMethodSignature(reader); diff --git a/src/System.Private.Reflection.Core/src/System/Reflection/Runtime/TypeInfos/NativeFormat/NativeFormatRuntimeGenericParameterTypeInfo.cs b/src/System.Private.Reflection.Core/src/System/Reflection/Runtime/TypeInfos/NativeFormat/NativeFormatRuntimeGenericParameterTypeInfo.cs index 678577135..f027f9caa 100644 --- a/src/System.Private.Reflection.Core/src/System/Reflection/Runtime/TypeInfos/NativeFormat/NativeFormatRuntimeGenericParameterTypeInfo.cs +++ b/src/System.Private.Reflection.Core/src/System/Reflection/Runtime/TypeInfos/NativeFormat/NativeFormatRuntimeGenericParameterTypeInfo.cs @@ -81,7 +81,11 @@ namespace System.Reflection.Runtime.TypeInfos.NativeFormat LowLevelList<QTypeDefRefOrSpec> constraints = new LowLevelList<QTypeDefRefOrSpec>(); foreach (Handle constraintHandle in _genericParameter.Constraints) { - constraints.Add(new QTypeDefRefOrSpec(reader, constraintHandle)); + // We're skipping custom modifiers here because Roslyn generates + // a modifier for the "unmanaged" constraint. This doesn't conform to the + // ECMA-335 spec, but we need to deal with it. The modifier is not visible + // to reflection. + constraints.Add(new QTypeDefRefOrSpec(reader, constraintHandle.SkipCustomModifiers(reader))); } return constraints.ToArray(); } |