[release/7.0-rc1] Fix auto layout algorithm to compute structure alignment correctly #74091
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…In particular: 1. The alignment requirement imposed by of a non-primitive, non-enum valuetype field is the alignment of that field 2. The alignment requirement imposed by a primitive is the pointer size of the target platform, unless running on Arm32, in which case if the primitive or enum is 8 bytes in size, the alignment requirement is 8. - The previous implementation produced an alignment of pointer size, unless running on Arm32 and one of the fields had an alignment requirement of 8 (in which case the alignment requirement computed for the structure would be 8) In addition, add a test which verifies that the instance field layout test types are actually producing R2R compatible results at runtime. - This test shows that we have some issues around explicit layout, so I was forced to disable that portion of the test for now. Fixes #65281
jeffschwMSFT
approved these changes
Aug 17, 2022
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CI passed. Ready to merge. |
ghost
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Backport of #73738 to release/7.0-rc1
/cc @davidwrighton
Customer Impact
This can cause incorrect layout of structure. If that happens there can be either data corruption, or if there are object fields on the type, there may be GC holes that cause the system to crash.
Testing
Standard PR runs + additional targeted test cases.
Risk
Moderate.
IMPORTANT: Is this backport for a servicing release? If so and this change touches code that ships in a NuGet package, please make certain that you have added any necessary package authoring and gotten it explicitly reviewed.