Fix invalid handle bug happening when TypeBuilder type used in exception catch clause
#106665
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jkotas
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Aug 19, 2024
src/libraries/System.Reflection.Emit/src/System/Reflection/Emit/PersistedAssemblyBuilder.cs
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This was referenced Aug 20, 2024
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/backport to release/9.0 |
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Started backporting to release/9.0: https://github.com/dotnet/runtime/actions/runs/10475035721 |
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PersistedAssemblyBuilder's
ILGeneratorcannot handle catch block with newly createdTypeBuilderexception type, because theTypeBuildertoken is not valid whenILGenerator.BeginCatchBlock(Type? exceptionType)called and the handle will not be populated properly until the assembly saved into a file or stream.The current solution for handling unpopulated tokens:
BlobBuilder.ReserveBytes(int)will not work for this case asControlFlowBuilder.AddCatchRegion(...)validates and reserves the exception type handle, not writes the token into BLOB directlySo instead of adding exception handler blocks directly into the
ControlFlowBuilderinstance collecting them into a list and adding them to theControlFlowBuilderduring Save where all tokens will be populated.Alternative solution: tried to fill valid
TypeBuilderhandles using reflection, but it's getting very messy, need to access and manipulate private/internal members ofControlFlowBuilder.Fixes #106485