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Required as a workaround for Proguard bug https://sourceforge.net/p/proguard/bugs/664/ When processing bytecode generated by Kotlin compiler for constructor call with stack spilling during arguments evaluation, ProGuard performs an equivalent transformation for the bytecode, but emits invalid stack frame information. In JVM 1.6, such invalid stack frames are ignored and re-evaluated by JVM during bytecode verification. In JVM 1.8, such invalid stack frames cause VerifyError.
Code Generation for Standard Library
Some of the code in the standard library is created by code generation based on templates.
For example, many Array methods need to be implemented separately for Array<T>, ByteArray, ShortArray, IntArray, etc.
To run the code generator from the libraries directory of a kotlin checkout, use the following command:
./gradlew :tools:kotlin-stdlib-gen:run
Note: on Windows type
gradlewwithout the leading./
This then runs the script which generates a significant part of stdlib sources from the templates authored with a special kotlin based DSL.