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JIT: Ensure correct alignment of CILJit singleton #73451

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Merged
merged 1 commit into from
Aug 5, 2022

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jakobbotsch
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Fix #73409

@ghost ghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Aug 5, 2022
@ghost ghost assigned jakobbotsch Aug 5, 2022
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ghost commented Aug 5, 2022

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Fix #73409

Author: jakobbotsch
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area-CodeGen-coreclr

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jkotas commented Aug 5, 2022

Linux arm failure is #73247

@jkotas jkotas merged commit 3fd454a into dotnet:main Aug 5, 2022
@@ -173,7 +161,8 @@ DLLEXPORT ICorJitCompiler* getJit()

if (ILJitter == nullptr)
{
ILJitter = new (CILJitSingleton) CILJit();
alignas(alignof(CILJit)) static char CILJitBuff[sizeof(CILJit)];
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Actually, is there a reason why we cannot just use a regular static CILJit singleton and just return its address here?

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I was not sure if there were concerns with the potential static constructor or ordering with jitStartup (there is a check that initialization has run before we construct this).

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CILJit constructor does close to nothing, it is just initializing the vtable. So the ordering is not a concern.

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placement new does not return properly aligned instance
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