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FIR checker: SENSELESS_(COMPARISON|NULL_IN_WHEN)

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Currently DFA does not set "definitely equal to null" for access to variables that got assigned `null`. For example, FIR should mark the following line as SENSELESS_COMPARISON due to `s = null` above.
 https://github.com/JetBrains/kotlin/blob/d1531f9cdd5852352c0133198706125dc63b6007/compiler/testData/diagnostics/tests/smartCasts/alwaysNull.fir.kt#L6

The problem is at https://github.com/JetBrains/kotlin/blob/7e9f27436a77de1c76e3705da7aa1fbe8938336b/compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/dfa/FirDataFlowAnalyzer.kt#L1104

For null assignment, ideally the type should be `Nothing?`. This is
addressed in a followup commit instead.
This commit is contained in:
Tianyu Geng
2021-07-20 09:46:18 -07:00
committed by teamcityserver
parent 4726dcce40
commit c7272f6986
108 changed files with 1410 additions and 1485 deletions
Download Patch File Download Diff File Expand all files Collapse all files
compiler/tests-spec/testData/diagnostics/notLinked/dfa/pos/8.fir.kt
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+1 -1
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@@ -56,7 +56,7 @@ fun case_2(a: Inv<Inv<Inv<Inv<Inv<Inv<Int?>?>?>?>?>?>?) {
fun case_3(a: Inv<Int>?) {
if (a != null) {
val b = a
if (a == null) {
if (<!SENSELESS_COMPARISON!>a == null<!>) {
<!DEBUG_INFO_EXPRESSION_TYPE("Inv<kotlin.Int>? & kotlin.Nothing")!>b<!>
<!DEBUG_INFO_EXPRESSION_TYPE("Inv<kotlin.Int>? & kotlin.Nothing")!>b<!>.equals(null)
<!DEBUG_INFO_EXPRESSION_TYPE("Inv<kotlin.Int>? & kotlin.Nothing")!>b<!>.propT