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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/59.fir.kt
Vendored
+11 -11
View File
@@ -13,7 +13,7 @@ fun case_1() {
do {
<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Any?")!>x<!>
x = x<!UNSAFE_CALL!>.<!>equals(10)
} while (x != null)
} while (<!SENSELESS_COMPARISON!>x != null<!>)
}
/*
@@ -27,7 +27,7 @@ fun case_2() {
do {
<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Any?")!>x<!>
x = x<!UNSAFE_CALL!>.<!>equals(10)
} while (x !== null)
} while (<!SENSELESS_COMPARISON!>x !== null<!>)
}
// TESTCASE NUMBER: 3
@@ -59,7 +59,7 @@ fun case_5() {
do {
<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Any?")!>x<!>
x = x<!UNSAFE_CALL!>.<!>equals(10)
} while (x !== null)
} while (<!SENSELESS_COMPARISON!>x !== null<!>)
}
/*
@@ -73,7 +73,7 @@ fun case_6() {
do {
<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Any?")!>x<!>
x = x<!UNSAFE_CALL!>.<!>equals(10)
} while (x != null)
} while (<!SENSELESS_COMPARISON!>x != null<!>)
}
/*
@@ -87,7 +87,7 @@ fun case_7() {
do {
<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Any?")!>x<!>
x = x<!UNSAFE_CALL!>.<!>equals(10)
} while (x !== null)
} while (<!SENSELESS_COMPARISON!>x !== null<!>)
}
/*
@@ -101,7 +101,7 @@ fun case_8() {
do {
<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Any?")!>x<!>
x = x<!UNSAFE_CALL!>.<!>equals(10)
} while (x != null)
} while (<!SENSELESS_COMPARISON!>x != null<!>)
}
/*
@@ -115,7 +115,7 @@ fun case_9() {
do {
<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Any?")!>x<!>
x = x<!UNSAFE_CALL!>.<!>equals(10)
} while (x !== null)
} while (<!SENSELESS_COMPARISON!>x !== null<!>)
}
/*
@@ -129,7 +129,7 @@ fun case_10() {
do {
<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Any?")!>x<!>
x = x<!UNSAFE_CALL!>.<!>equals(10)
} while (x != null)
} while (<!SENSELESS_COMPARISON!>x != null<!>)
}
/*
@@ -143,7 +143,7 @@ fun case_11() {
do {
<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Any?")!>x<!>
x = x<!UNSAFE_CALL!>.<!>equals(10)
} while (x != null)
} while (<!SENSELESS_COMPARISON!>x != null<!>)
}
/*
@@ -157,7 +157,7 @@ fun case_12() {
do {
<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Any?")!>x<!>
x = x <!UNSAFE_CALL!>.<!>equals(10)
} while (x != null)
} while (<!SENSELESS_COMPARISON!>x != null<!>)
}
}
@@ -172,7 +172,7 @@ fun case_13() {
do {
<!DEBUG_INFO_EXPRESSION_TYPE("kotlin.Any?")!>x<!>
x = x <!UNSAFE_CALL!>.<!>equals(10)
} while (x != null)
} while (<!SENSELESS_COMPARISON!>x != null<!>)
}
}