KT-64931: add convertion of kotlin top-lvl functions into swift static functions

Merge-request: KT-MR-13878
Merged-by: Artem Olkov <artem.olkov@jetbrains.com>

native/swift/sir-printer/src/org/jetbrains/sir/printer/SirAsSwiftSourcesPrinter.kt

@@ -31,6 +31,7 @@ public class SirAsSwiftSourcesPrinter(private val printer: SmartPrinter) : SirVi
     override fun visitFunction(function: SirFunction): Unit = with(printer) {
         print(
             function.visibility.takeIf { it != SirVisibility.INTERNAL }?.let { "${it.swift} " } ?: "",
+            if (function.isStatic) { "static " } else { "" },
             "func ",
             function.name.swiftIdentifier,
             "("

native/swift/sir-printer/testData/static_function.golden.swift

@@ -0,0 +1,5 @@
+public static func foo(
+    arg1: Swift.Int32
+) -> Swift.Bool {
+    return foo_wrapped(arg1)
+}

native/swift/sir-printer/tests/org/jetbrains/kotlin/sir/printer/SirAsSwiftSourcesPrinterTests.kt

@@ -37,6 +37,7 @@ class SirAsSwiftSourcesPrinterTests {
             declarations.add(
                 buildFunction {
                     origin = SirOrigin.Unknown
+                    isStatic = false
                     visibility = SirVisibility.PUBLIC
                     name = "foo"
                     returnType = SirNominalType(SirSwiftModule.bool)
@@ -57,6 +58,7 @@ class SirAsSwiftSourcesPrinterTests {
             declarations.add(
                 buildFunction {
                     origin = SirOrigin.Unknown
+                    isStatic = false
                     visibility = SirVisibility.PUBLIC
                     name = "foo1"
                     returnType = SirNominalType(SirSwiftModule.bool)
@@ -65,6 +67,7 @@ class SirAsSwiftSourcesPrinterTests {
             declarations.add(
                 buildFunction {
                     origin = SirOrigin.Unknown
+                    isStatic = false
                     visibility = SirVisibility.PUBLIC
                     name = "foo2"
                     returnType = SirNominalType(SirSwiftModule.bool)
@@ -85,6 +88,7 @@ class SirAsSwiftSourcesPrinterTests {
             declarations.add(
                 buildFunction {
                     origin = SirOrigin.Unknown
+                    isStatic = false
                     visibility = SirVisibility.PUBLIC
                     name = "foo"
                     parameters.add(
@@ -112,6 +116,7 @@ class SirAsSwiftSourcesPrinterTests {
             declarations.add(
                 buildFunction {
                     origin = SirOrigin.Unknown
+                    isStatic = false
                     visibility = SirVisibility.PUBLIC
                     name = "foo"
                     parameters.add(
@@ -146,6 +151,7 @@ class SirAsSwiftSourcesPrinterTests {
             declarations.add(
                 buildFunction {
                     origin = SirOrigin.Unknown
+                    isStatic = false
                     visibility = SirVisibility.PUBLIC
                     name = "foo"
                     parameters.addAll(
@@ -199,6 +205,7 @@ class SirAsSwiftSourcesPrinterTests {
             declarations.add(
                 buildFunction {
                     origin = SirOrigin.Unknown
+                    isStatic = false
                     visibility = SirVisibility.PUBLIC
                     name = "foo"
                     parameters.add(
@@ -219,6 +226,35 @@ class SirAsSwiftSourcesPrinterTests {
         )
     }
 
+    @Test
+    fun `should print static`() {
+
+        val module = buildModule {
+            name = "Test"
+            declarations.add(
+                buildFunction {
+                    origin = SirOrigin.Unknown
+                    isStatic = true
+                    visibility = SirVisibility.PUBLIC
+                    name = "foo"
+                    parameters.add(
+                        SirParameter(
+                            argumentName = "arg1",
+                            type = SirNominalType(SirSwiftModule.int32)
+                        )
+                    )
+                    returnType = SirNominalType(SirSwiftModule.bool)
+                    body = SirFunctionBody(listOf("return foo_wrapped(arg1)"))
+                }
+            )
+        }
+
+        runTest(
+            module,
+            "testData/static_function"
+        )
+    }
+
     private fun runTest(module: SirModule, goldenDataFile: String) {
         val expectedSwiftSrc = File(KtTestUtil.getHomeDirectory()).resolve("$goldenDataFile.golden.swift")