JIT: update layout of BLK nodes during escape analysis #115845
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If we retype a struct local we also need to retype any BLK operations on those locals. Fixes dotnet#115832.
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@dotnet/jit-contrib PTAL No diffs but a lot of missed contexts. |
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Pull Request Overview
This PR fixes a JIT assertion by propagating updated struct layouts to BLK nodes during escape analysis retyping.
- Extended
UpdateAncestorTypesto accept a newClassLayout* newLayoutparameter. - Added
SetLayoutcalls forGT_STORE_BLKandGT_BLKnodes whenretypeFieldsis true. - Introduced a new repro test (
Runtime_115832) to catch the original assertion.
Reviewed Changes
Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.
Show a summary per file
| File | Description |
|---|---|
| src/tests/JIT/opt/ObjectStackAllocation/*.csproj | Added optimized test project for repro case |
| src/tests/JIT/opt/ObjectStackAllocation/Runtime_115832.cs | New fuzz-generated test reproducing the JIT assert |
| src/coreclr/jit/objectalloc.h | Updated UpdateAncestorTypes signature to include newLayout |
| src/coreclr/jit/objectalloc.cpp | Implemented layout propagation to BLK nodes |
| src/coreclr/jit/gentree.h | Added GenTreeBlk::SetLayout to allow runtime layout updates |
Comments suppressed due to low confidence (2)
src/coreclr/jit/objectalloc.cpp:2196
- Consider adding a unit test that exercises the
GT_STORE_BLKretype path to ensureSetLayoutis correctly applied and prevent future regressions.
if (retypeFields && parent->OperIs(GT_STORE_BLK))
src/coreclr/jit/objectalloc.cpp:2189
- The removal of the
addr->OperIs(GT_FIELD_ADDR)check broadens theSTOREINDretyping logic beyond struct field stores, which conflicts with the existing comment. Consider restoring that guard or updating the comment to reflect the intended behavior.
if (parent->OperIs(GT_STOREIND) && varTypeIsGC(parent->TypeGet()))
| // tree - Possibly-stack-pointing tree | ||
| // parentStack - Parent stack of the possibly-stack-pointing tree | ||
| // newType - New type of the possibly-stack-pointing tree | ||
| // newLayout - Layout for a retyped local struct |
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You added a description for newLayout in the implementation comments; please update the corresponding declaration comment in objectalloc.h so the header and implementation stay in sync.
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@dotnet/jit-contrib ping |
jakobbotsch
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May 22, 2025
SimaTian
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If we retype a struct local we also need to retype any BLK operations on those locals. Fixes #115832.
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If we retype a struct local we also need to retype any BLK operations on those locals.
Fixes #115832.