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Fix tbaa annotation on union selector bytes inside of structs #54604

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merged 3 commits into from
Jun 5, 2024
Merged

Fix tbaa annotation on union selector bytes inside of structs #54604

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8e95fa8
Fix tbaa annotation on union selector bytes inside of structs to avoi…
gbaraldi May 28, 2024
b0655d8
Fix typo!
gbaraldi May 28, 2024
5180b6b
Merge branch 'master' into gb/tbaa-union-ub
gbaraldi Jun 5, 2024
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5 changes: 3 additions & 2 deletions src/cgutils.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2806,7 +2806,8 @@ static MDNode *best_field_tbaa(jl_codectx_t &ctx, const jl_cgval_t &strct, jl_da
}
}
if (strct.V && jl_field_isconst(jt, idx) && isLoadFromConstGV(strct.V))
return ctx.tbaa().tbaa_const;
return ctx.tbaa().tbaa_const; //TODO: it seems odd to have a field with a tbaa that doesn't alias it's containing struct's tbaa
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"it's" -> "its" ?

//Does the fact that this is marked as constant make this fine?
return tbaa;
}

Expand Down Expand Up @@ -2903,7 +2904,7 @@ static jl_cgval_t emit_getfield_knownidx(jl_codectx_t &ctx, const jl_cgval_t &st
else {
ptindex = emit_struct_gep(ctx, cast<StructType>(lt), staddr, byte_offset + fsz1);
}
auto val = emit_unionload(ctx, addr, ptindex, jfty, fsz, al, tbaa, !jl_field_isconst(jt, idx), union_max, ctx.tbaa().tbaa_unionselbyte);
auto val = emit_unionload(ctx, addr, ptindex, jfty, fsz, al, tbaa, !jl_field_isconst(jt, idx), union_max, strct.tbaa);
if (val.V && val.V != addr) {
setNameWithField(ctx.emission_context, val.V, get_objname, jt, idx, Twine());
}
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9 changes: 9 additions & 0 deletions test/compiler/codegen.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -938,3 +938,12 @@ BigStructAnyInt() = BigStructAnyInt((Union{Base.inferencebarrier(Float64), Int}=
@test egal_any54109(Torture1_54109(), Torture1_54109())
@test egal_any54109(Torture2_54109(), Torture2_54109())
@test !egal_any54109(Torture1_54109(), Torture1_54109((DefaultOr54109(2.0, false) for i = 1:897)...))

function foo54599()
pkgid = Base.identify_package("Test")
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Is it possible to minimise this a bit or is that tricky? It's a lot of code under the hood here and with changes to that code it's possible a regression would not be found?

println(devnull,pkgid)
println(devnull, pkgid.uuid)
pkgid.uuid
end

@test foo54599() !== nothing