JS backend: tests for KT-6401 JS: wrong result for code with many spread operator

js/js.translator/testData/native/cases/vararg.kt

@@ -6,6 +6,9 @@ fun paramCount(vararg a: Int): Int = noImpl
 native("paramCount")
 fun anotherParamCount(vararg a: Int): Int = noImpl
 
+native("paramCount")
+fun genericParamCount<T>(vararg a: T): Int = noImpl
+
 // test spread operator
 fun count(vararg a: Int) = paramCount(*a)
 
@@ -56,6 +59,15 @@ fun testCallOrder(vararg args: Int) =
         Bar(args.size, 0).test(1, 1, *args) && Bar(args.size, 2).test(3, 1, *args) &&
         !Bar.hasOrderProblem
 
+native
+fun sumOfParameters(x: Int, y: Int, vararg a: Int): Int = noImpl
+
+native
+fun sumFunValuesOnParameters(x: Int, y: Int, vararg a: Int, f: (Int) -> Int): Int = noImpl
+
+native
+fun idArrayVarArg<T>(vararg a: Array<T>): Array<T> = noImpl
+
 fun box(): String {
     if (paramCount() != 0)
         return "failed when call native function without args"
@@ -115,5 +127,23 @@ fun box(): String {
     if (!(baz!!)?.test(0, 1, 1))
         return "failed when combined SureCall and SafeCall, maybe we lost cached expression"
 
+    val a = array(1, 2)
+    assertEquals(2, genericParamCount(*a))
+    assertEquals(7, genericParamCount(1, *a, *a, 1, 2))
+
+    assertEquals(45, sumOfParameters(1, 2, 3, 4, 5, 6, 7, 8, 9))
+    assertEquals(45, sumOfParameters(1, 2, *intArray(3, 4, 5, 6, 7, 8, 9)))
+    assertEquals(45, sumOfParameters(1, 2, 3, 4, *intArray(5, 6, 7, 8, 9)))
+    assertEquals(90, sumFunValuesOnParameters(1, 2, 3, 4, 5, 6, 7, 8, 9) { 2*it })
+    assertEquals(90, sumFunValuesOnParameters(1, 2, *intArray(3, 4, 5, 6, 7, 8, 9)) { 2*it })
+    assertEquals(90, sumFunValuesOnParameters(1, 2, 3, 4, *intArray(5, 6, 7, 8, 9)) { 2*it })
+    assertEquals(90, sumFunValuesOnParameters(1, 2, *intArray(3, 4, 5, 6, 7), 8, 9) { 2*it })
+    assertEquals(90, sumFunValuesOnParameters(1, 2, *intArray(3, 4, 5), *intArray(6, 7, 8, 9)) { 2*it })
+    assertEquals(90, sumFunValuesOnParameters(1, 2, *intArray(3, 4), 5, 6, *intArray(7, 8, 9)) { 2*it })
+
+    assertEquals(2, idArrayVarArg(array(1), *array(array(2, 3, 4))).size())
+    assertEquals(3, idArrayVarArg(array(1, 2), *array(array(3, 4), array(5, 6))).size())
+    assertEquals(6, idArrayVarArg(array(1, 2), *array(array(3, 4), array(5, 6)), array(7), *array(array(8, 9), array(10, 11))).size())
+
     return "OK"
 }

js/js.translator/testData/native/native/vararg.js

@@ -41,4 +41,29 @@ function testNativeVarargWithFunLit(/* args, f */) {
     var args = Array.prototype.slice.call(arguments, 0, arguments.length - 1);
     var f = arguments[arguments.length - 1];
     return typeof f === "function" && f(args);
+}
+
+function sumOfParameters() {
+    var size = arguments.length;
+    var result = 0;
+    for (var i = 0; i < size; i++) {
+        result += arguments[i];
+    }
+    return result;
+}
+
+function sumFunValuesOnParameters() {
+    var size = arguments.length - 1;
+    var f = arguments[arguments.length - 1];
+    var result = 0;
+    for (var i = 0; i < size; i++) {
+        var u = arguments[i];
+        result += f(u);
+    }
+    return result;
+}
+
+function idArrayVarArg() {
+    var args = Array.prototype.slice.call(arguments, 0, arguments.length);
+    return args;
 }