Fix for KT-5910: Can't call Throwable() in Kotlin

#KT-5910 Fixed

compiler/testData/builtin-classes.txt

@@ -1279,7 +1279,10 @@ public final class String : kotlin.Comparable<kotlin.String>, kotlin.CharSequenc
 }
 
 public open class Throwable {
-    /*primary*/ public constructor Throwable(/*0*/ message: kotlin.String? = ..., /*1*/ cause: kotlin.Throwable? = ...)
+    public constructor Throwable()
+    public constructor Throwable(/*0*/ message: kotlin.String?)
+    /*primary*/ public constructor Throwable(/*0*/ message: kotlin.String?, /*1*/ cause: kotlin.Throwable?)
+    public constructor Throwable(/*0*/ cause: kotlin.Throwable?)
     public final val cause: kotlin.Throwable?
         public final fun <get-cause>(): kotlin.Throwable?
     public final val message: kotlin.String?

compiler/testData/codegen/box/intrinsics/throwable.kt

@@ -0,0 +1,22 @@
+fun box(): String {
+    val s: String? = "OK"
+    val t: Throwable? = Throwable("test", null)
+
+    val z = Throwable(s, t)
+    if (z.message !== s) return "fail 1: ${z.message}"
+    if (z.cause !== t) return "fail 2: ${z.cause}"
+
+    val z2 = Throwable(s)
+    if (z2.message !== s) return "fail 3: ${z2.message}"
+    if (z2.cause !== null) return "fail 4: ${z2.cause}"
+
+    val z3 = Throwable(t)
+    if (z3.message != "java.lang.Throwable: test") return "fail 5: ${z3.message}"
+    if (z3.cause !== t) return "fail 6: ${z2.cause}"
+
+    val z4 = Throwable()
+    if (z4.message !== null) return "fail 7: ${z4.message}"
+    if (z4.cause !== null) return "fail 8: ${z4.cause}"
+
+    return z.message!!
+}

compiler/testData/codegen/box/intrinsics/throwableCallableReference.kt

@@ -0,0 +1,30 @@
+import kotlin.reflect.KFunction2
+import kotlin.reflect.KFunction1
+import kotlin.reflect.KFunction0
+
+fun box(): String {
+    val s: String? = "OK"
+    val t: Throwable? = Throwable("test", null)
+    var thr1: KFunction2<String?, Throwable?, Throwable> = ::Throwable
+    val z = thr1(s, t)
+    if (z.message !== s) return "fail 1: ${z.message}"
+    if (z.cause !== t) return "fail 2: ${z.cause}"
+
+    var thr2: KFunction1<String?, Throwable> = ::Throwable
+
+    val z2 = thr2(s)
+    if (z2.message !== s) return "fail 3: ${z2.message}"
+    if (z2.cause !== null) return "fail 4: ${z2.cause}"
+
+    var thr3: KFunction1<Throwable?, Throwable> = ::Throwable
+    val z3 = thr3(t)
+    if (z3.message != "java.lang.Throwable: test") return "fail 5: ${z3.message}"
+    if (z3.cause !== t) return "fail 6: ${z2.cause}"
+
+    var thr4: KFunction0<Throwable> = ::Throwable
+    val z4 = thr4()
+    if (z4.message !== null) return "fail 7: ${z4.message}"
+    if (z4.cause !== null) return "fail 8: ${z4.cause}"
+
+    return z.message!!
+}

compiler/testData/codegen/box/intrinsics/throwableParamOrder.kt

@@ -0,0 +1,17 @@
+var res = ""
+
+fun getM(): String {
+    res += "M"
+    return "OK"
+}
+
+fun getT(): Throwable {
+    res += "T"
+    return Throwable("test", null)
+}
+
+fun box(): String {
+    val z = Throwable(cause = getT(), message = getM())
+    if (res != "TM") return "Wrong argument calculation order: $res"
+    return z.message!!
+}

compiler/tests/org/jetbrains/kotlin/codegen/generated/BlackBoxCodegenTestGenerated.java

@@ -4765,6 +4765,24 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             doTest(fileName);
         }
 
+        @TestMetadata("throwable.kt")
+        public void testThrowable() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/intrinsics/throwable.kt");
+            doTest(fileName);
+        }
+
+        @TestMetadata("throwableCallableReference.kt")
+        public void testThrowableCallableReference() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/intrinsics/throwableCallableReference.kt");
+            doTest(fileName);
+        }
+
+        @TestMetadata("throwableParamOrder.kt")
+        public void testThrowableParamOrder() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/intrinsics/throwableParamOrder.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("tostring.kt")
         public void testTostring() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/intrinsics/tostring.kt");

core/builtins/native/kotlin/Throwable.kt

@@ -22,7 +22,13 @@ package kotlin
  * @param message the detail message string.
  * @param cause the cause of this throwable.
  */
-public open class Throwable(val message: String? = null, val cause: Throwable? = null) {
+public open class Throwable(val message: String?, val cause: Throwable?) {
+
+    constructor(message: String?) : this(message, null)
+
+    constructor(cause: Throwable?) : this(cause?.toString(), cause)
+
+    constructor() : this(null, null)
     /**
      * Prints the stack trace of this throwable to the standard output.
      */