[IR][tests] New test: change of visibility for callables

compiler/testData/klibABI/changeFunctionVisibility/lib1/l1.kt

@@ -0,0 +1,12 @@
+public fun publicToInternalFunction() = 42
+public fun publicToPrivateFunction() = 42
+
+open class Container {
+    public fun publicToProtectedFunction() = 42
+    public fun publicToInternalFunction() = 42
+    public fun publicToPrivateFunction() = 42
+
+    protected fun protectedToPublicFunction() = 42
+    protected fun protectedToInternalFunction() = 42
+    protected fun protectedToPrivateFunction() = 42
+}

compiler/testData/klibABI/changeFunctionVisibility/lib1/l1.kt.1

@@ -0,0 +1,12 @@
+internal fun publicToInternalFunction() = 42
+private fun publicToPrivateFunction() = 42
+
+open class Container {
+    protected fun publicToProtectedFunction() = 42
+    internal fun publicToInternalFunction() = 42
+    private fun publicToPrivateFunction() = 42
+
+    public fun protectedToPublicFunction() = 42
+    internal fun protectedToInternalFunction() = 42
+    private fun protectedToPrivateFunction() = 42
+}

compiler/testData/klibABI/changeFunctionVisibility/lib1/module.info

@@ -0,0 +1,6 @@
+STEP 0:
+    dependencies: stdlib
+STEP 1:
+    dependencies: stdlib
+    modifications:
+        U : l1.kt.1 -> l1.kt

compiler/testData/klibABI/changeFunctionVisibility/lib2/l2.kt

@@ -0,0 +1,11 @@
+class ContainerImpl : Container() {
+    // Just to check that accessing from within the class hierarchy has the same effect as accessing from the outside:
+    fun publicToProtectedFunctionAccess() = publicToProtectedFunction()
+    fun publicToInternalFunctionAccess() = publicToInternalFunction()
+    fun publicToPrivateFunctionAccess() = publicToPrivateFunction()
+
+    // As far as protected members can't be accessed outside of the class hierarchy, we need special accessors.
+    fun protectedToPublicFunctionAccess() = protectedToPublicFunction()
+    fun protectedToInternalFunctionAccess() = protectedToInternalFunction()
+    fun protectedToPrivateFunctionAccess() = protectedToPrivateFunction()
+}

compiler/testData/klibABI/changeFunctionVisibility/lib2/module.info

@@ -0,0 +1,2 @@
+STEP 0:
+    dependencies: stdlib, lib1

compiler/testData/klibABI/changeFunctionVisibility/main/m.kt

@@ -0,0 +1,127 @@
+fun test1(): String {
+    return try {
+        publicToInternalFunction()
+        "OK"
+    } catch(e: Throwable) {
+        e.message.orEmpty().ifBlank { "FAIL1" }
+    }
+}
+
+fun test2(): String {
+    return try {
+        publicToPrivateFunction()
+        "FAIL2"
+    } catch(e: Throwable) {
+        e.checkLinkageError("function publicToPrivateFunction can not be called")
+    }
+}
+
+fun test3(): String {
+    val c = ContainerImpl()
+    return try {
+        c.publicToProtectedFunction()
+        "OK"
+    } catch(e: Throwable) {
+        e.message.orEmpty().ifBlank { "FAIL3" }
+    }
+}
+
+fun test4(): String {
+    val c = ContainerImpl()
+    return try {
+        c.publicToInternalFunction()
+        "FAIL4"
+    } catch(e: Throwable) {
+        e.checkLinkageError("function publicToInternalFunction can not be called")
+    }
+}
+
+fun test5(): String {
+    val c = ContainerImpl()
+    return try {
+        c.publicToPrivateFunction()
+        "FAIL5"
+    } catch(e: Throwable) {
+        e.checkLinkageError("function publicToPrivateFunction can not be called")
+    }
+}
+
+fun test6(): String {
+    val c = ContainerImpl()
+    return try {
+        c.publicToProtectedFunctionAccess()
+        "OK"
+    } catch(e: Throwable) {
+        e.message.orEmpty().ifBlank { "FAIL6" }
+    }
+}
+
+fun test7(): String {
+    val c = ContainerImpl()
+    return try {
+        c.publicToInternalFunctionAccess()
+        "FAIL7"
+    } catch(e: Throwable) {
+        e.checkLinkageError("function publicToInternalFunction can not be called")
+    }
+}
+
+fun test8(): String {
+    val c = ContainerImpl()
+    return try {
+        c.publicToPrivateFunctionAccess()
+        "FAIL8"
+    } catch(e: Throwable) {
+        e.checkLinkageError("function publicToPrivateFunction can not be called")
+    }
+}
+
+fun test9(): String {
+    val c = ContainerImpl()
+    return try {
+        c.protectedToPublicFunctionAccess()
+        "OK"
+    } catch(e: Throwable) {
+        e.message.orEmpty().ifBlank { "FAIL9" }
+    }
+}
+
+fun test10(): String {
+    val c = ContainerImpl()
+    return try {
+        c.protectedToInternalFunctionAccess()
+        "FAIL10"
+    } catch(e: Throwable) {
+        e.checkLinkageError("function protectedToInternalFunction can not be called")
+    }
+}
+
+fun test11(): String {
+    val c = ContainerImpl()
+    return try {
+        c.protectedToPrivateFunctionAccess()
+        "FAIL11"
+    } catch(e: Throwable) {
+        e.checkLinkageError("function protectedToPrivateFunction can not be called")
+    }
+}
+
+fun box() = checkResults(test1(), test2(), test3(), test4(), test5(), test6(), test7(), test8(), test9(), test10(), test11())
+
+private fun Throwable.checkLinkageError(prefix: String): String {
+    if (this::class.simpleName != "IrLinkageError") return "Unexpected throwable: ${this::class}"
+
+    val expectedMessagePrefix = "$prefix because it uses unlinked symbols"
+    val actualMessage = message.orEmpty()
+
+    return if (actualMessage.startsWith(expectedMessagePrefix))
+        "OK"
+    else
+        "EXPECTED: $expectedMessagePrefix, ACTUAL: $actualMessage"
+}
+
+private fun checkResults(vararg results: String): String = when {
+    results.isEmpty() -> "no results to check"
+    results.all { it == "OK" } -> "OK"
+    else -> results.joinToString("\n")
+}

compiler/testData/klibABI/changeFunctionVisibility/main/module.info

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+STEP 0:
+    dependencies: stdlib, lib1, lib2

compiler/testData/klibABI/changeFunctionVisibility/project.info

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+MODULES: lib1, lib2, main
+
+STEP 0:
+    libs: lib1, lib2, main
+
+STEP 1:
+    libs: lib1