KT-715. T.javaClass & TypeInfo.javaClassForType

compiler/testData/codegen/regressions/kt715.kt

@@ -0,0 +1,11 @@
+
+val test = "lala".javaClass
+
+val test2 = typeinfo<Int>().javaClassForType
+
+fun box(): String {
+    if(test.getCanonicalName() != "java.lang.String") return "fail"
+    System.out?.println(test2.getCanonicalName())
+    if(test2.getCanonicalName() != "java.lang.Integer") return "fail"
+    return "OK"
+}

compiler/tests/org/jetbrains/jet/codegen/StdlibTest.java

@@ -72,4 +72,8 @@ public class StdlibTest extends CodegenTestCase {
     public void testKt828 () {
         blackBoxFile("regressions/kt828.kt");
     }
+
+    public void testKt715 () {
+        blackBoxFile("regressions/kt715.kt");
+    }
 }

stdlib/ktSrc/JavaLang.kt

@@ -0,0 +1,10 @@
+package std
+
+import java.lang.Class
+import java.lang.Object
+
+val <T> T.javaClass : Class<T>
+    get() = jet.runtime.Intrinsics.getJavaClass(this) as Class<T>
+
+val <T> TypeInfo<T>.javaClassForType : Class<T>
+    get() = (this as org.jetbrains.jet.rt.TypeInfoImpl<T>).getJavaClass().sure()

stdlib/src/jet/runtime/Intrinsics.java

@@ -1,6 +1,7 @@
 package jet.runtime;
 
 import jet.Function0;
+import jet.TypeInfo;
 
 import java.util.ArrayList;
 
@@ -18,6 +19,10 @@ public class Intrinsics {
     public static void throwNpe() {
         throw new JetNullPointerException();
     }
+    
+    public static <T> Class<T> getJavaClass(T self) {
+        return (Class<T>) self.getClass();
+    }
 
     public static int compare(long thisVal, long anotherVal) {
         return (thisVal<anotherVal ? -1 : (thisVal==anotherVal ? 0 : 1));