[K/N] Support pre-creating for objects with only constant properties

kotlin-native/backend.native/tests/codegen/objectDeclaration/globalConstants.kt

@@ -0,0 +1,81 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package codegen.objectDeclaration.globalConstants
+
+import kotlin.test.*
+import kotlin.native.internal.*
+
+object EmptyClass {}
+
+@Test fun checkEmptyClass() {
+    assertTrue(EmptyClass.isPermanent())
+}
+
+
+object ClassWithConstants {
+    const val A = 1
+    const val B = 2L
+    const val C = 3.0
+    const val D = 4.0f
+    const val E = 5.toShort()
+    const val F = 6.toByte()
+    const val G = "8"
+}
+
+@Test fun checkInit() {
+    assertTrue(ClassWithConstants.isPermanent())
+    assertEquals(1, ClassWithConstants.A)
+    assertEquals(2, ClassWithConstants.B)
+    assertEquals(3.0, ClassWithConstants.C)
+    assertEquals(4.0f, ClassWithConstants.D)
+    assertEquals(5, ClassWithConstants.E)
+    assertEquals(6, ClassWithConstants.F)
+    assertEquals("8", ClassWithConstants.G)
+
+    assertEquals(1, (ClassWithConstants::A)())
+    assertEquals(2, (ClassWithConstants::B)())
+    assertEquals(3.0, (ClassWithConstants::C)())
+    assertEquals(4.0f, (ClassWithConstants::D)())
+    assertEquals(5, (ClassWithConstants::E)())
+    assertEquals(6, (ClassWithConstants::F)())
+    assertEquals("8", (ClassWithConstants::G)())
+}
+
+
+var ClassWithConstructorInitialized = 0
+
+object ClassWithConstructor {
+    init {
+        ClassWithConstructorInitialized += 1
+    }
+    const val A = 1;
+}
+
+@Test fun checkConstructor() {
+    assertEquals(0, ClassWithConstructorInitialized)
+    assertEquals(1, ClassWithConstructor.A)
+    assertEquals(1, ClassWithConstructorInitialized)
+    assertEquals(1, ClassWithConstructor.A)
+    assertEquals(1, ClassWithConstructorInitialized)
+    assertFalse(ClassWithConstructor.isPermanent())
+}
+
+object ClassWithField {
+    val x = 4
+}
+
+@Test fun checkField() {
+    assertFalse(ClassWithField.isPermanent())
+}
+
+object ClassWithComputedField {
+    val x : Int
+       get() = 4
+}
+
+@Test fun checkComputedField() {
+    assertTrue(ClassWithComputedField.isPermanent())
+}