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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/contracts/declarations/contractFunction/neg/2.fir.kt
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+2 -2
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@@ -61,12 +61,12 @@ class case_5<T> : ClassLevel5() {
inner class case_5_1 {
fun <K : Number?>K.case_5_1_1() {
contract { <!ERROR_IN_CONTRACT_DESCRIPTION!>returns() implies (<!UNRESOLVED_LABEL!>this@case_5_1<!> !is ClassLevel1 && <!UNRESOLVED_LABEL!>this@case_5_1<!> != null || <!UNRESOLVED_LABEL!>this@case_5<!> is ClassLevel1 && this@case_5_1_1 is Float)<!> }
if (!(this@case_5_1 !is ClassLevel1 && this@case_5_1 != null || <!USELESS_IS_CHECK!>this@case_5 is ClassLevel1<!> && this is Float)) throw Exception()
if (!(this@case_5_1 !is ClassLevel1 && <!SENSELESS_COMPARISON!>this@case_5_1 != null<!> || <!USELESS_IS_CHECK!>this@case_5 is ClassLevel1<!> && this is Float)) throw Exception()
}
fun case_5_1_2() {
contract { <!ERROR_IN_CONTRACT_DESCRIPTION!>returns() implies (<!UNRESOLVED_LABEL!>this@case_5_1<!> !is ClassLevel1 || <!UNRESOLVED_LABEL!>this@case_5<!> is ClassLevel1 || <!UNRESOLVED_LABEL!>this@case_5_1<!> == null)<!> }
if (!(this@case_5_1 !is ClassLevel1 || <!USELESS_IS_CHECK!>this@case_5 is ClassLevel1<!> || this@case_5_1 == null)) throw Exception()
if (!(this@case_5_1 !is ClassLevel1 || <!USELESS_IS_CHECK!>this@case_5 is ClassLevel1<!> || <!SENSELESS_COMPARISON!>this@case_5_1 == null<!>)) throw Exception()
}
}
}