Fix nullability propagation in inline class type mapping

#KT-27096

See https://jetbrains.slack.com/archives/C06E082M6/p1537949572000100

compiler/testData/codegen/box/inlineClasses/kt27096.kt

@@ -0,0 +1,23 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+// WITH_RUNTIME
+
+inline class Ucn(private val i: UInt)
+
+class PPInput(private val s: ByteArray) {
+    fun peek(n: UInt = 0u): Ucn? =
+        if (n >= s.size.toUInt())
+            null
+        else
+            Ucn(s[n.toInt()].toUInt())
+}
+
+fun box(): String {
+    val ppInput = PPInput(byteArrayOf(0.toByte(), 0.toByte(), 0.toByte()))
+
+    if (ppInput.peek(0u) == null) throw AssertionError()
+    if (ppInput.peek(100u) != null) throw AssertionError()
+    if (ppInput.peek(0u)!!.toString() != "Ucn(i=0)") throw AssertionError(ppInput.peek(0u)!!.toString())
+
+    return "OK"
+}

compiler/testData/codegen/box/inlineClasses/kt27096_enum.kt

@@ -0,0 +1,31 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+
+enum class En { N, A, B, C }
+
+inline class Z1(val x: En)
+inline class Z2(val z: Z1)
+inline class ZN(val z: Z1?)
+
+fun wrap1(x: En): Z1? = if (x.ordinal == 0) null else Z1(x)
+fun wrap2(x: En): Z2? = if (x.ordinal == 0) null else Z2(Z1(x))
+fun wrapN(x: En): ZN? = if (x.ordinal == 0) null else ZN(Z1(x))
+
+fun box(): String {
+    val n = En.N
+    val a = En.A
+
+    if (wrap1(n) != null) throw AssertionError()
+    if (wrap1(a) == null) throw AssertionError()
+    if (wrap1(a)!!.x != a) throw AssertionError()
+
+    if (wrap2(n) != null) throw AssertionError()
+    if (wrap2(a) == null) throw AssertionError()
+    if (wrap2(a)!!.z.x != a) throw AssertionError()
+
+    if (wrapN(n) != null) throw AssertionError()
+    if (wrapN(a) == null) throw AssertionError()
+    if (wrapN(a)!!.z!!.x != a) throw AssertionError()
+
+    return "OK"
+}

compiler/testData/codegen/box/inlineClasses/kt27096_functional.kt

@@ -0,0 +1,26 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+
+inline class Z1(val x: () -> String)
+inline class Z2(val z: Z1)
+inline class ZN(val z: Z1?)
+
+fun wrap1(x: String): Z1? = if (x.length == 0) null else Z1({ x })
+fun wrap2(x: String): Z2? = if (x.length == 0) null else Z2(Z1({ x }))
+fun wrapN(x: String): ZN? = if (x.length == 0) null else ZN(Z1({ x }))
+
+fun box(): String {
+    if (wrap1("") != null) throw AssertionError()
+    if (wrap1("a") == null) throw AssertionError()
+    if (wrap1("a")!!.x() != "a") throw AssertionError()
+
+    if (wrap2("") != null) throw AssertionError()
+    if (wrap2("a") == null) throw AssertionError()
+    if (wrap2("a")!!.z.x() != "a") throw AssertionError()
+
+    if (wrapN("") != null) throw AssertionError()
+    if (wrapN("a") == null) throw AssertionError()
+    if (wrapN("a")!!.z!!.x() != "a") throw AssertionError()
+
+    return "OK"
+}

compiler/testData/codegen/box/inlineClasses/kt27096_innerClass.kt

@@ -0,0 +1,42 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+
+class Outer<X>(val x: X) {
+    inner class Inner<Y>(val y: Y) {
+        val hasNull = x == null || y == null
+
+        fun outerX() = x
+
+        override fun equals(other: Any?): Boolean =
+            other is Outer<*>.Inner<*> &&
+                    other.outerX() == x &&
+                    other.y == y
+    }
+}
+
+inline class Z1<X, Y>(val x: Outer<X>.Inner<Y>)
+inline class Z2<X, Y>(val z: Z1<X, Y>)
+inline class ZN<X, Y>(val z: Z1<X, Y>?)
+
+fun <X, Y> wrap1(xy : Outer<X>.Inner<Y>): Z1<X, Y>? = if (xy.hasNull) null else Z1(xy)
+fun <X, Y> wrap2(xy : Outer<X>.Inner<Y>): Z2<X, Y>? = if (xy.hasNull) null else Z2(Z1(xy))
+fun <X, Y> wrapN(xy : Outer<X>.Inner<Y>): ZN<X, Y>? = if (xy.hasNull) null else ZN(Z1(xy))
+
+fun box(): String {
+    val n = Outer(null).Inner("a")
+    val a = Outer("a").Inner("a")
+
+    if (wrap1(n) != null) throw AssertionError()
+    if (wrap1(a) == null) throw AssertionError()
+    if (wrap1(a)!!.x != a) throw AssertionError()
+
+    if (wrap2(n) != null) throw AssertionError()
+    if (wrap2(a) == null) throw AssertionError()
+    if (wrap2(a)!!.z.x != a) throw AssertionError()
+
+    if (wrapN(n) != null) throw AssertionError()
+    if (wrapN(a) == null) throw AssertionError()
+    if (wrapN(a)!!.z!!.x != a) throw AssertionError()
+
+    return "OK"
+}

compiler/testData/codegen/box/inlineClasses/kt27096_nullablePrimitive.kt

@@ -0,0 +1,26 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+
+inline class Z1(val x: Int?)
+inline class Z2(val z: Z1)
+inline class ZN(val z: Z1?)
+
+fun wrap1(n: Int): Z1? = if (n < 0) null else Z1(n)
+fun wrap2(n: Int): Z2? = if (n < 0) null else Z2(Z1(n))
+fun wrapN(n: Int): ZN? = if (n < 0) null else ZN(Z1(n))
+
+fun box(): String {
+    if (wrap1(-1) != null) throw AssertionError()
+    if (wrap1(42) == null) throw AssertionError()
+    if (wrap1(42)!!.x != 42) throw AssertionError()
+
+    if (wrap2(-1) != null) throw AssertionError()
+    if (wrap2(42) == null) throw AssertionError()
+    if (wrap2(42)!!.z.x != 42) throw AssertionError()
+
+    if (wrapN(-1) != null) throw AssertionError()
+    if (wrapN(42) == null) throw AssertionError()
+    if (wrapN(42)!!.z!!.x != 42) throw AssertionError()
+
+    return "OK"
+}

compiler/testData/codegen/box/inlineClasses/kt27096_nullableReference.kt

@@ -0,0 +1,26 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+
+inline class Z1(val x: String?)
+inline class Z2(val z: Z1)
+inline class ZN(val z: Z1?)
+
+fun wrap1(x: String): Z1? = if (x.length == 0) null else Z1(x)
+fun wrap2(x: String): Z2? = if (x.length == 0) null else Z2(Z1(x))
+fun wrapN(x: String): ZN? = if (x.length == 0) null else ZN(Z1(x))
+
+fun box(): String {
+    if (wrap1("") != null) throw AssertionError()
+    if (wrap1("a") == null) throw AssertionError()
+    if (wrap1("a")!!.x != "a") throw AssertionError()
+
+    if (wrap2("") != null) throw AssertionError()
+    if (wrap2("a") == null) throw AssertionError()
+    if (wrap2("a")!!.z.x != "a") throw AssertionError()
+
+    if (wrapN("") != null) throw AssertionError()
+    if (wrapN("a") == null) throw AssertionError()
+    if (wrapN("a")!!.z!!.x != "a") throw AssertionError()
+
+    return "OK"
+}

compiler/testData/codegen/box/inlineClasses/kt27096_primitive.kt

@@ -0,0 +1,32 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+
+inline class Z1(val x: Int)
+inline class Z2(val z: Z1)
+inline class ZN(val z: Z1?)
+inline class ZN2(val z: ZN)
+
+fun wrap1(n: Int): Z1? = if (n < 0) null else Z1(n)
+fun wrap2(n: Int): Z2? = if (n < 0) null else Z2(Z1(n))
+fun wrapN(n: Int): ZN? = if (n < 0) null else ZN(Z1(n))
+fun wrapN2(n: Int): ZN2? = if (n < 0) null else ZN2(ZN(Z1(n)))
+
+fun box(): String {
+    if (wrap1(-1) != null) throw AssertionError()
+    if (wrap1(42) == null) throw AssertionError()
+    if (wrap1(42)!!.x != 42) throw AssertionError()
+
+    if (wrap2(-1) != null) throw AssertionError()
+    if (wrap2(42) == null) throw AssertionError()
+    if (wrap2(42)!!.z.x != 42) throw AssertionError()
+
+    if (wrapN(-1) != null) throw AssertionError()
+    if (wrapN(42) == null) throw AssertionError()
+    if (wrapN(42)!!.z!!.x != 42) throw AssertionError()
+
+    if (wrapN2(-1) != null) throw AssertionError()
+    if (wrapN2(42) == null) throw AssertionError()
+    if (wrapN2(42)!!.z.z!!.x != 42) throw AssertionError()
+
+    return "OK"
+}

compiler/testData/codegen/box/inlineClasses/kt27096_reference.kt

@@ -0,0 +1,32 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+
+inline class Z1(val x: String)
+inline class Z2(val z: Z1)
+inline class ZN(val z: Z1?)
+inline class ZN2(val z: ZN)
+
+fun wrap1(x: String): Z1? = if (x.length == 0) null else Z1(x)
+fun wrap2(x: String): Z2? = if (x.length == 0) null else Z2(Z1(x))
+fun wrapN(x: String): ZN? = if (x.length == 0) null else ZN(Z1(x))
+fun wrapN2(x: String): ZN2? = if (x.length == 0) null else ZN2(ZN(Z1(x)))
+
+fun box(): String {
+    if (wrap1("") != null) throw AssertionError()
+    if (wrap1("a") == null) throw AssertionError()
+    if (wrap1("a")!!.x != "a") throw AssertionError()
+
+    if (wrap2("") != null) throw AssertionError()
+    if (wrap2("a") == null) throw AssertionError()
+    if (wrap2("a")!!.z.x != "a") throw AssertionError()
+
+    if (wrapN("") != null) throw AssertionError()
+    if (wrapN("a") == null) throw AssertionError()
+    if (wrapN("a")!!.z!!.x != "a") throw AssertionError()
+
+    if (wrapN2("") != null) throw AssertionError()
+    if (wrapN2("a") == null) throw AssertionError()
+    if (wrapN2("a")!!.z.z!!.x != "a") throw AssertionError()
+
+    return "OK"
+}

compiler/testData/codegen/box/inlineClasses/nullableWrapperEquality.kt

@@ -0,0 +1,18 @@
+// !LANGUAGE: +InlineClasses
+// IGNORE_BACKEND: JVM_IR
+
+inline class Z1(val x: String)
+inline class ZN(val z: Z1?)
+inline class ZN2(val z: ZN)
+
+fun zap(b: Boolean): ZN2? = if (b) null else ZN2(ZN(null))
+
+fun eq(a: Any?, b: Any?) = a == b
+
+fun box(): String {
+    val x = zap(true)
+    val y = zap(false)
+    if (eq(x, y)) throw AssertionError()
+
+    return "OK"
+}