Updates from master#879
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Instead of equations for a single function, `K` helper functions are
generated and the equations split (more or less?) evenly among them (by
modulo of the Int-valued IDs).
```
syntax TypeInfo ::= lookupType0(Int) [function, total]
syntax TypeInfo ::= lookupType1(Int) [function, total]
...
syntax Typeinfo ::= lookupType<K-1>(Int) [function, total]
rule lookupType(ty(N)) => lookupType0(N) requires N %Int K ==Int 0
rule lookupType(ty(N)) => lookupType1(N) requires N %Int K ==Int 1
...
rule lookupType(ty(N)) => lookupType<K-1>(N) requires N %Int K ==Int <K - 1>
```
Each of the helpers gets its own default, all are total.
```
rule lookupType0(_) => TypeInfoVoidType [owise] // (i.e., not found)
rule lookupType1(_) => TypeInfoVoidType [owise] // (i.e., not found)
...
```
For a given `TypeMapping(ty('X), 'TYPEINFO)`, the `X` is divided by `K`
and the equation is generated in the respective helper function `m = 'X
%Int K`
```
rule lookupType'<m>('X) => 'TYPEINFO
```
This stratification is applied for the `lookupAlloc` and `lookupTy`
functions.
…876) When using pointer offsets followed by dereferencing, the returned result is an array (subslice of the original). In some cases, the value is used as a single element, for instance by projecting out a field. This PR adds a special rule for the field projection case to proceed using the head element in those cases. Related: #771
Stevengre
approved these changes
Dec 4, 2025
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