Tianyu Geng
c7272f6986
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.
67 lines
1.3 KiB
Kotlin
Vendored
67 lines
1.3 KiB
Kotlin
Vendored
// !LANGUAGE: +AllowContractsForCustomFunctions +UseReturnsEffect
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// !USE_EXPERIMENTAL: kotlin.contracts.ExperimentalContracts
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// !DIAGNOSTICS: -INVISIBLE_REFERENCE -INVISIBLE_MEMBER
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import kotlin.contracts.*
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fun myAssert(condition: Boolean) {
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contract {
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returns() implies (condition)
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}
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if (!condition) throw kotlin.IllegalArgumentException("Assertion failed")
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}
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fun testAssertSmartcast(x: Any?) {
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myAssert(x is String)
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x.length
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}
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fun testInvertedAssert(x: Any?) {
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myAssert(x !is String)
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x.<!UNRESOLVED_REFERENCE!>length<!>
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}
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fun testSpilling(x: Any?) {
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if (x != null) {
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myAssert(x is String)
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x.length
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}
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x<!UNSAFE_CALL!>.<!>length
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}
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fun testAssertInIf(x: Any?) {
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if (myAssert(x is String) == Unit) {
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x.length
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}
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else {
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x.length
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}
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}
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fun testTryCatch(x: Any?) {
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try {
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myAssert(x is String)
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x.length
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} catch (e: kotlin.IllegalArgumentException) {
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}
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x.<!UNRESOLVED_REFERENCE!>length<!>
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}
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fun testUncertainFlow(x: Any?) {
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repeat(x.toString().length) {
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myAssert(x is String)
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x.length
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}
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x.<!UNRESOLVED_REFERENCE!>length<!>
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}
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fun testAtLeastOnceFlow(x: Any?) {
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do {
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myAssert(x is String)
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x.length
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} while (<!SENSELESS_COMPARISON!>x != null<!>)
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x.length
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}
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