Big Kotlin Work List

[sschr15]

A bunch of things to get Kotlin to be (mostly) decompiling Kotlin and not a Kotlin-Java hybrid, split into a few main categories.

Technical Backend

• Publish Kotlin metadata to Kotlin-targeting code (partially in 4891bff)
• Kotlin exprent equivalents
• Other special Kotlin construct handling code

Non-method fixes

• Field declarations (Kotlin property decompilation #275)
• data class support (flag indicated via 8b8c86d)
• annotation class support (6ca6edb)
• Primary constructors (Class, method, and constructor declarations #307)
• Other constructors (Class, method, and constructor declarations #307)
• extends / implements clauses (8b8c86d)
• Anonymous classes
• Annotation arrays should use [] (6ca6edb)
• Other explicit arrays should use arrayOf or the equivalent primitive type
• All known-to-have-generic types must specify generics
• Higher level functions not based on SAM interfaces
• Top-level declarations (8e2283e)
• Type aliases
• Nullable types in generics (type creation via 0a4b157)

Method fixes

• Remove unnecessary semicolons (which should be all of them if decompiling reasonably)
• Remove new from constructor calls
• Destructuring declarations
• String interpolation
• Smart Casts
• Receiver types (should decompile as this or as this@...)
• SAM lambda decompilation
• Non-SAM lambda decompilation
• for loops and if conditions on ranges (Experimental work done in https://github.com/Vineflower/vineflower/tree/feature/kotlin/loop-changes)
  • repeat
  • rangeTo
  • until and later Kotlin rangeUntil
  • downTo
  • step
• Infix functions
• Operator functions
• tailrec functions
• when statements
• Inline uninlining

[Kroppeb]

lateinit var

[LlamaLad7]

Inline function call decompilation would be cool. It should be possible from the source map.