JIT: fix spill logic for local structs #797
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If we're appending an assignment whose LHS is is a location within a local struct, we need to spill all references to that struct from the eval stack. Update the existing logic for this to handle the case where the LHS is a field of a local struct, and the field is updated by unusual means (here, `initobj`). Fixes dotnet#764.
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@CarolEidt PTAL No diffs on x64 Fx + Tests (other than for this new test case). |
sandreenko
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Release/3.1 port of dotnet/runtime#797. Fixes dotnet/runtime#764 The jit might incorrectly order a read from a struct field with an operation that modifies the field, so that the read returns the wrong value. Silent bad code; program behaves incorrectly. Yes, introduced in the 3.0 cycle. Verified the user's test case now passes; no diffs seen in any existing framework or test code. **Low**: the jit is now spilling the eval stack entries to temps in cases where it did not before; this should be conservatively safe. cc: @Brucefo ____ If we're appending an assignment whose LHS is is a location within a local struct, we need to spill all references to that struct from the eval stack. Update the existing logic for this to handle the case where the LHS is a field of a local struct, and the field is updated by unusual means (here, `initobj`). Fixes dotnet/runtime#764.
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* [release/3.1] Port fix for JIT silent bad code Release/3.1 port of dotnet/runtime#797. Fixes dotnet/runtime#764 The jit might incorrectly order a read from a struct field with an operation that modifies the field, so that the read returns the wrong value. Silent bad code; program behaves incorrectly. Yes, introduced in the 3.0 cycle. Verified the user's test case now passes; no diffs seen in any existing framework or test code. **Low**: the jit is now spilling the eval stack entries to temps in cases where it did not before; this should be conservatively safe. cc: @Brucefo ____ If we're appending an assignment whose LHS is is a location within a local struct, we need to spill all references to that struct from the eval stack. Update the existing logic for this to handle the case where the LHS is a field of a local struct, and the field is updated by unusual means (here, `initobj`). Fixes dotnet/runtime#764. * Fix test
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If we're appending an assignment whose LHS is is a location within a local
struct, we need to spill all references to that struct from the eval stack.
Update the existing logic for this to handle the case where the LHS is a field
of a local struct, and the field is updated by unusual means (here,
initobj).Fixes #764.