Simon Ogorodnik
2cf8f75a90
In FIR we desugar when with multiple conditions leading to same block
as tree of OR expressions
Given
```
when(some) {
"a", "b", "c" -> {}
else -> {}
}
```
actually desugared into
```
when(val <subj> = some) {
<subj> == "a" || <subj> == "b" || <subj> == "c" -> {}
else -> {}
}
```
There is a multiple ways of how we can organize such expressions in FIR
Previously it was just nesting-chain of OR expressions
While the most efficient way in terms of required stack depth is
a balanced tree
KT-53255
65 lines
1.6 KiB
Plaintext
Vendored
65 lines
1.6 KiB
Plaintext
Vendored
object A {
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private constructor() /* primary */ {
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super/*Any*/()
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/* <init>() */
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}
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}
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fun testWithSubject(x: Any?): String {
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return { // BLOCK
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val tmp0_subject: Any? = x
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when {
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EQEQ(arg0 = tmp0_subject, arg1 = null) -> "null"
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EQEQ(arg0 = tmp0_subject, arg1 = A) -> "A"
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tmp0_subject is String -> "String"
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tmp0_subject !is Number -> "!Number"
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setOf<Nothing>().contains<Number>(element = tmp0_subject /*as Number */) -> "nothingness?"
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else -> "something"
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}
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}
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}
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fun test(x: Any?): String {
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return when {
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EQEQ(arg0 = x, arg1 = null) -> "null"
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EQEQ(arg0 = x, arg1 = A) -> "A"
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x is String -> "String"
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x !is Number -> "!Number"
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setOf<Nothing>().contains<Number>(element = x /*as Number */) -> "nothingness?"
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else -> "something"
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}
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}
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fun testComma(x: Int): String {
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return { // BLOCK
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val tmp1_subject: Int = x
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when {
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when {
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when {
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EQEQ(arg0 = tmp1_subject, arg1 = 1) -> true
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else -> EQEQ(arg0 = tmp1_subject, arg1 = 2)
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} -> true
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else -> when {
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EQEQ(arg0 = tmp1_subject, arg1 = 3) -> true
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else -> EQEQ(arg0 = tmp1_subject, arg1 = 4)
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}
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} -> "1234"
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when {
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EQEQ(arg0 = tmp1_subject, arg1 = 5) -> true
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else -> when {
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EQEQ(arg0 = tmp1_subject, arg1 = 6) -> true
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else -> EQEQ(arg0 = tmp1_subject, arg1 = 7)
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}
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} -> "567"
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when {
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EQEQ(arg0 = tmp1_subject, arg1 = 8) -> true
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else -> EQEQ(arg0 = tmp1_subject, arg1 = 9)
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} -> "89"
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else -> "?"
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}
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}
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}
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