in runner/src/main/kotlin/org/jetbrains/idea/inspections/runners/IdeaRunner.kt [278:283]
fun allocateSystemDirectory(ideaSystemDirectory: File, buildNumber: String, usesUltimate: Boolean): String {
systemDirectory?.let { return it.absolutePath }
val systemDirectory = generateSystemPath(ideaSystemDirectory, buildNumber, usesUltimate)
this.systemDirectory = systemDirectory
return systemDirectory.absolutePath
}