35 lines
1.1 KiB
Markdown
35 lines
1.1 KiB
Markdown
## IL ret not allowed in a try region
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### Scope
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Edge
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### Version Introduced
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4.6
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### Source Analyzer Status
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Planned
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### Change Description
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Unlike the JIT64 just-in-time compiler, RyuJIT (used in .NET 4.6) does not allow an IL ret instruction in a try region. Returning from a try region is disallowed by the ECMA-335 specification, and no known managed compiler generates such IL. However, the JIT64 compiler will execute such IL if it is generated using reflection emit.
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- [x] Quirked
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- [ ] Build-time break
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### Recommended Action
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If an app is generating IL that includes a ret opcode in a try region, the app may target .NET 4.5 to use the old JIT and avoid this break. Alternatively, the generated IL may be updated to return after the try region.
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### Affected APIs
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* Not detectable via API analysis
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### Category
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JIT
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[More information](https://msdn.microsoft.com/en-us/library/dn833125(v=vs.110).aspx#RyuJIT)
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<!--
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### Notes
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We could maybe detect this by looking for apps that emit ret opcodes, but we'd have to also know whether they were emitted into a try block.
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-->
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<!-- breaking change id: 80 -->
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