Provide "equals" and "hashCode" for reflection objects

compiler/testData/codegen/boxWithStdlib/reflection/methodsFromAny/equalsHashCode.kt

@@ -0,0 +1,29 @@
+import kotlin.test.*
+
+val top = 42
+var top2 = -23
+
+val Int.intExt: Int get() = this
+val Char.charExt: Int get() = this.toInt()
+
+class A(var mem: String)
+class B(var mem: String)
+
+
+fun checkEqual(x: Any, y: Any) {
+    assertEquals(x, y)
+    assertEquals(x.hashCode(), y.hashCode(), "Elements are equal but their hash codes are not: ${x.hashCode()} != ${y.hashCode()}")
+}
+
+fun box(): String {
+    checkEqual(::top, ::top)
+    checkEqual(::top2, ::top2)
+    checkEqual(Int::intExt, Int::intExt)
+    checkEqual(A::mem, A::mem)
+
+    assertFalse(::top == ::top2)
+    assertFalse(Int::intExt == Char::charExt)
+    assertFalse(A::mem == B::mem)
+
+    return "OK"
+}

compiler/tests/org/jetbrains/jet/codegen/generated/BlackBoxWithStdlibCodegenTestGenerated.java

@@ -1381,7 +1381,7 @@ public class BlackBoxWithStdlibCodegenTestGenerated extends AbstractBlackBoxCode
     }
     
     @TestMetadata("compiler/testData/codegen/boxWithStdlib/reflection")
-    @InnerTestClasses({Reflection.Enclosing.class, Reflection.GenericSignature.class, Reflection.Mapping.class})
+    @InnerTestClasses({Reflection.Enclosing.class, Reflection.GenericSignature.class, Reflection.Mapping.class, Reflection.MethodsFromAny.class})
     public static class Reflection extends AbstractBlackBoxCodegenTest {
         public void testAllFilesPresentInReflection() throws Exception {
             JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), "org.jetbrains.jet.generators.tests.TestsPackage", new File("compiler/testData/codegen/boxWithStdlib/reflection"), Pattern.compile("^(.+)\\.kt$"), true);
@@ -1530,12 +1530,26 @@ public class BlackBoxWithStdlibCodegenTestGenerated extends AbstractBlackBoxCode
             
         }
         
+        @TestMetadata("compiler/testData/codegen/boxWithStdlib/reflection/methodsFromAny")
+        public static class MethodsFromAny extends AbstractBlackBoxCodegenTest {
+            public void testAllFilesPresentInMethodsFromAny() throws Exception {
+                JetTestUtils.assertAllTestsPresentByMetadata(this.getClass(), "org.jetbrains.jet.generators.tests.TestsPackage", new File("compiler/testData/codegen/boxWithStdlib/reflection/methodsFromAny"), Pattern.compile("^(.+)\\.kt$"), true);
+            }
+            
+            @TestMetadata("equalsHashCode.kt")
+            public void testEqualsHashCode() throws Exception {
+                doTestWithStdlib("compiler/testData/codegen/boxWithStdlib/reflection/methodsFromAny/equalsHashCode.kt");
+            }
+            
+        }
+        
         public static Test innerSuite() {
             TestSuite suite = new TestSuite("Reflection");
             suite.addTestSuite(Reflection.class);
             suite.addTest(Enclosing.innerSuite());
             suite.addTestSuite(GenericSignature.class);
             suite.addTestSuite(Mapping.class);
+            suite.addTestSuite(MethodsFromAny.class);
             return suite;
         }
     }

core/runtime.jvm/src/kotlin/reflect/jvm/internal/KClassImpl.kt

@@ -56,4 +56,10 @@ class KClassImpl<out T>(val jClass: Class<T>) : KClass<T> {
             else {
                 KMutableForeignMemberProperty<T, Any>(name, this)
             }
+
+    override fun equals(other: Any?): Boolean =
+            other is KClassImpl<*> && jClass == other.jClass
+
+    override fun hashCode(): Int =
+            jClass.hashCode()
 }

core/runtime.jvm/src/kotlin/reflect/jvm/internal/KForeignMemberProperty.kt

@@ -30,6 +30,12 @@ open class KForeignMemberProperty<T : Any, out R>(
     override fun get(receiver: T): R {
         return field.get(receiver) as R
     }
+
+    override fun equals(other: Any?): Boolean =
+            other is KForeignMemberProperty<*, *> && name == other.name && owner == other.owner
+
+    override fun hashCode(): Int =
+            name.hashCode() * 31 + owner.hashCode()
 }
 
 class KMutableForeignMemberProperty<T : Any, out R>(

core/runtime.jvm/src/kotlin/reflect/jvm/internal/KMemberPropertyImpl.kt

@@ -39,6 +39,12 @@ open class KMemberPropertyImpl<T : Any, out R>(
     override fun get(receiver: T): R {
         return getter(receiver) as R
     }
+
+    override fun equals(other: Any?): Boolean =
+            other is KMemberPropertyImpl<*, *> && name == other.name && owner == other.owner
+
+    override fun hashCode(): Int =
+            name.hashCode() * 31 + owner.hashCode()
 }
 
 class KMutableMemberPropertyImpl<T : Any, R>(

core/runtime.jvm/src/kotlin/reflect/jvm/internal/KPackageImpl.kt

@@ -18,4 +18,10 @@ package kotlin.reflect.jvm.internal
 
 import kotlin.reflect.KPackage
 
-class KPackageImpl(val jClass: Class<*>) : KPackage
+class KPackageImpl(val jClass: Class<*>) : KPackage {
+    override fun equals(other: Any?): Boolean =
+            other is KPackageImpl && jClass == other.jClass
+
+    override fun hashCode(): Int =
+            jClass.hashCode()
+}

core/runtime.jvm/src/kotlin/reflect/jvm/internal/KTopLevelExtensionPropertyImpl.kt

@@ -32,6 +32,12 @@ open class KTopLevelExtensionPropertyImpl<T, out R>(
     override fun get(receiver: T): R {
         return getter(null, receiver) as R
     }
+
+    override fun equals(other: Any?): Boolean =
+            other is KTopLevelExtensionPropertyImpl<*, *> && name == other.name && owner == other.owner && receiverClass == other.receiverClass
+
+    override fun hashCode(): Int =
+            (name.hashCode() * 31 + owner.hashCode()) * 31 + receiverClass.hashCode()
 }
 
 class KMutableTopLevelExtensionPropertyImpl<T, R>(

core/runtime.jvm/src/kotlin/reflect/jvm/internal/KTopLevelVariableImpl.kt

@@ -32,6 +32,12 @@ open class KTopLevelVariableImpl<out R>(
     override fun get(): R {
         return getter(null) as R
     }
+
+    override fun equals(other: Any?): Boolean =
+            other is KTopLevelVariableImpl<*> && name == other.name && owner == other.owner
+
+    override fun hashCode(): Int =
+            name.hashCode() * 31 + owner.hashCode()
 }
 
 class KMutableTopLevelVariableImpl<R>(