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https://issues.apache.org/jira/browse/IMPALA-8196?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong updated IMPALA-8196:
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Labels: udf (was: )
> IR UDFs should not allow importing symbols with hidden visibility
> -----------------------------------------------------------------
>
> Key: IMPALA-8196
> URL: https://issues.apache.org/jira/browse/IMPALA-8196
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Affects Versions: Impala 3.1.0
> Reporter: Tim Armstrong
> Priority: Minor
> Labels: udf
>
> Discovered while working on IMPALA-8187, as part of which i'll add a test
> showing the behaviour
> If an IR module has some hidden symbols in it, e.g. like the following, then
> we can actually create a UDF that calls the hidden symbol. This is
> inconsistent with the shared object UDFs.
> {code}
> ; Function Attrs: norecurse nounwind uwtable
> define hidden { i8, i64 }
> @_Z16UnexportedSymbolPN10impala_udf15FunctionContextE(%"class.impala_udf::FunctionContext"*
> nocapture readnone) local_unnamed_addr #3 {
> %2 = alloca %"struct.impala_udf::BigIntVal", align 8
> call void @_ZN10impala_udf9BigIntValC2El(%"struct.impala_udf::BigIntVal"*
> nonnull %2, i64 5)
> %3 = getelementptr inbounds %"struct.impala_udf::BigIntVal",
> %"struct.impala_udf::BigIntVal"* %2, i64 0, i32 0, i32 0
> %4 = load i8, i8* %3, align 8
> %5 = insertvalue { i8, i64 } undef, i8 %4, 0
> %6 = getelementptr inbounds %"struct.impala_udf::BigIntVal",
> %"struct.impala_udf::BigIntVal"* %2, i64 0, i32 1
> %7 = load i64, i64* %6, align 8
> %8 = insertvalue { i8, i64 } %5, i64 %7, 1
> ret { i8, i64 } %8
> }
> {code}
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