Support passing inline class values with spread operator

compiler/backend/src/org/jetbrains/kotlin/codegen/ExpressionCodegen.java

@@ -2808,12 +2808,14 @@ public class ExpressionCodegen extends KtVisitor<StackValue, StackValue> impleme
                     for (int i = 0; i != size; ++i) {
                         v.dup();
                         ValueArgument argument = arguments.get(i);
+                        KtExpression argumentExpression = argument.getArgumentExpression();
+                        KotlinType argumentKotlinType = kotlinType(argumentExpression);
                         if (argument.getSpreadElement() != null) {
-                            gen(argument.getArgumentExpression(), OBJECT_TYPE);
+                            gen(argumentExpression, OBJECT_TYPE, argumentKotlinType);
                             v.invokevirtual(owner, "addSpread", "(Ljava/lang/Object;)V", false);
                         }
                         else {
-                            gen(argument.getArgumentExpression(), elementType);
+                            gen(argumentExpression, elementType, argumentKotlinType);
                             v.invokevirtual(owner, "add", addDescriptor, false);
                         }
                     }

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

@@ -0,0 +1,17 @@
+// !LANGUAGE: +InlineClasses
+
+inline class UInt(val value: Int)
+
+fun <T> last(vararg e: T): T = e[e.size - 1]
+fun <T> first(vararg e: T): T = e[0]
+
+fun box(): String {
+    val u0 = UInt(0)
+    val us = arrayOf(UInt(1), UInt(2), UInt(3))
+
+    if (last(u0, *us).value != 3) return "fail"
+    if (first(*us, u0).value != 1) return "fail"
+    if (first(u0, *us).value != 0) return "fail"
+
+    return "OK"
+}

compiler/testData/codegen/bytecodeText/inlineClasses/passInlineClassesWithSpreadOperatorToVarargs.kt

@@ -0,0 +1,20 @@
+// !LANGUAGE: +InlineClasses
+
+inline class UInt(val u: Int)
+
+fun <T> takeVarargs(vararg e: T) {}
+
+fun test(u1: UInt, u2: UInt, us: Array<UInt>) {
+    takeVarargs(*us) // copy + checkcast
+    takeVarargs(u1, u2, *us) // 2 box + ...
+}
+
+// 2 INVOKESTATIC UInt\$Erased.box
+// 0 INVOKEVIRTUAL UInt.unbox
+
+// 2 CHECKCAST \[LUInt
+
+// 0 CHECKCAST \[Ljava/lang/Integer
+
+// 0 intValue
+// 0 valueOf

compiler/tests-ir-jvm/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java

@@ -10497,6 +10497,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             doTest(fileName);
         }
 
+        @TestMetadata("passInlineClassWithSpreadOperatorToVarargs.kt")
+        public void testPassInlineClassWithSpreadOperatorToVarargs() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/inlineClasses/passInlineClassWithSpreadOperatorToVarargs.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("referToPropertyInCompanionObjectOfInlineClass.kt")
         public void testReferToPropertyInCompanionObjectOfInlineClass() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/inlineClasses/referToPropertyInCompanionObjectOfInlineClass.kt");

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

@@ -10497,6 +10497,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             doTest(fileName);
         }
 
+        @TestMetadata("passInlineClassWithSpreadOperatorToVarargs.kt")
+        public void testPassInlineClassWithSpreadOperatorToVarargs() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/inlineClasses/passInlineClassWithSpreadOperatorToVarargs.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("referToPropertyInCompanionObjectOfInlineClass.kt")
         public void testReferToPropertyInCompanionObjectOfInlineClass() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/inlineClasses/referToPropertyInCompanionObjectOfInlineClass.kt");

compiler/tests/org/jetbrains/kotlin/codegen/BytecodeTextTestGenerated.java

@@ -2016,6 +2016,12 @@ public class BytecodeTextTestGenerated extends AbstractBytecodeTextTest {
             doTest(fileName);
         }
 
+        @TestMetadata("passInlineClassesWithSpreadOperatorToVarargs.kt")
+        public void testPassInlineClassesWithSpreadOperatorToVarargs() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/bytecodeText/inlineClasses/passInlineClassesWithSpreadOperatorToVarargs.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("skipCallToUnderlyingValueOfInlineClass.kt")
         public void testSkipCallToUnderlyingValueOfInlineClass() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/bytecodeText/inlineClasses/skipCallToUnderlyingValueOfInlineClass.kt");

compiler/tests/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java

@@ -10497,6 +10497,12 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             doTest(fileName);
         }
 
+        @TestMetadata("passInlineClassWithSpreadOperatorToVarargs.kt")
+        public void testPassInlineClassWithSpreadOperatorToVarargs() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/inlineClasses/passInlineClassWithSpreadOperatorToVarargs.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("referToPropertyInCompanionObjectOfInlineClass.kt")
         public void testReferToPropertyInCompanionObjectOfInlineClass() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/inlineClasses/referToPropertyInCompanionObjectOfInlineClass.kt");

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java

@@ -11481,6 +11481,12 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
             doTest(fileName);
         }
 
+        @TestMetadata("passInlineClassWithSpreadOperatorToVarargs.kt")
+        public void testPassInlineClassWithSpreadOperatorToVarargs() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/inlineClasses/passInlineClassWithSpreadOperatorToVarargs.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("referToPropertyInCompanionObjectOfInlineClass.kt")
         public void testReferToPropertyInCompanionObjectOfInlineClass() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/inlineClasses/referToPropertyInCompanionObjectOfInlineClass.kt");