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ef5e02da84
* In blocks, discard the result of any statement that has a return type other than void. This was previously done by wrapping each statement into an "implicit Unit conversion" that was actually compiled down to a stack pop instead. If an expression happened to already have type Unit, however, such a conversion was not inserted, resulting in a stray reference on the stack. These conversions are now redundant and should probably be removed. * In assignments and non-exhaustive conditionals, materialize a Unit on the stack to avoid depth mismatches that trip up the bytecode validator. Because such expressions are generally used at block level (and, indeed, the frontend will reject a non-exhaustive conditional used as an expression), combined with the above change this results in no additional GETSTATIC opcodes, as they are immediately removed by the peephole optimizer.
22 lines
473 B
Kotlin
Vendored
22 lines
473 B
Kotlin
Vendored
// Even before any IR lowerings, the type of `when` is determined to be
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// Unit even though the outer `if` still returns `Int?`. This results
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// in a ClassCastException when that Unit is converted into a Number.
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// IGNORE_BACKEND: JVM_IR
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fun test(
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b: Boolean,
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i: Int
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) {
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if (b) {
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when (i) {
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0 -> foo(1)
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else -> null
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}
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} else null
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}
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fun foo(i: Int) = i
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fun box(): String {
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test(true, 1)
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return "OK"
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} |