Dmitriy Novozhilov
44 lines
1.3 KiB
Kotlin
Vendored
44 lines
1.3 KiB
Kotlin
Vendored
// ISSUE: KT-44804
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// WITH_STDLIB
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abstract class AbstractInsnNode(val next: AbstractInsnNode? = null)
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class LineNumberNode(next: AbstractInsnNode? = null) : AbstractInsnNode(next) {
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val line: Int = 1
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}
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class LabelNode() : AbstractInsnNode(null)
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fun isDeadLineNumber(insn: LineNumberNode, index: Int, frames: Array<out Any?>): Boolean {
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// Line number node is "dead" if the corresponding line number interval
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// contains at least one "dead" meaningful instruction and no "live" meaningful instructions.
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var finger: AbstractInsnNode = insn
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var fingerIndex = index
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var hasDeadInsn = false
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loop@ while (true) {
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finger = finger.next ?: break
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fingerIndex++
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when (finger) {
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is LabelNode ->
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continue@loop
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is LineNumberNode ->
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if (finger.line != insn.line) return hasDeadInsn
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else -> {
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if (frames[fingerIndex] != null) return false
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hasDeadInsn = true
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}
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}
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}
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return true
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}
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fun box(): String {
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val node = LineNumberNode(
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LineNumberNode(
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LabelNode()
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)
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)
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val result = isDeadLineNumber(node, 0, arrayOf(null, null, "aaa", "bbb"))
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return if (result) "OK" else "fail"
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}
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