MethodHandles: Add tests for MethodHandles.filterReturnValue.
Test: make test-art-host
Bug: 30550796
Change-Id: I2c8f25b003cbeee24e7603637169200a02d31e1c
diff --git a/test/957-methodhandle-transforms/src/Main.java b/test/957-methodhandle-transforms/src/Main.java
index 3c6f119..3026be1 100644
--- a/test/957-methodhandle-transforms/src/Main.java
+++ b/test/957-methodhandle-transforms/src/Main.java
@@ -31,6 +31,7 @@
testIdentity();
testConstant();
testBindTo();
+ testFilterReturnValue();
}
public static void testThrowException() throws Throwable {
@@ -708,6 +709,80 @@
}
}
+ public static String filterReturnValue_target(int a) {
+ return "ReturnValue" + a;
+ }
+
+ public static boolean filterReturnValue_filter(String value) {
+ return value.indexOf("42") != -1;
+ }
+
+ public static int filterReturnValue_intTarget(String a) {
+ return Integer.parseInt(a);
+ }
+
+ public static int filterReturnValue_intFilter(int b) {
+ return b + 1;
+ }
+
+ public static void filterReturnValue_voidTarget() {
+ }
+
+ public static int filterReturnValue_voidFilter() {
+ return 42;
+ }
+
+ public static void testFilterReturnValue() throws Throwable {
+ // A target that returns a reference.
+ {
+ final MethodHandle target = MethodHandles.lookup().findStatic(Main.class,
+ "filterReturnValue_target", MethodType.methodType(String.class, int.class));
+ final MethodHandle filter = MethodHandles.lookup().findStatic(Main.class,
+ "filterReturnValue_filter", MethodType.methodType(boolean.class, String.class));
+
+ MethodHandle adapter = MethodHandles.filterReturnValue(target, filter);
+
+ boolean value = (boolean) adapter.invoke((int) 42);
+ if (!value) {
+ System.out.println("Unexpected value: " + value);
+ }
+ value = (boolean) adapter.invoke((int) 43);
+ if (value) {
+ System.out.println("Unexpected value: " + value);
+ }
+ }
+
+ // A target that returns a primitive.
+ {
+ final MethodHandle target = MethodHandles.lookup().findStatic(Main.class,
+ "filterReturnValue_intTarget", MethodType.methodType(int.class, String.class));
+ final MethodHandle filter = MethodHandles.lookup().findStatic(Main.class,
+ "filterReturnValue_intFilter", MethodType.methodType(int.class, int.class));
+
+ MethodHandle adapter = MethodHandles.filterReturnValue(target, filter);
+
+ int value = (int) adapter.invoke("56");
+ if (value != 57) {
+ System.out.println("Unexpected value: " + value);
+ }
+ }
+
+ // A target that returns void.
+ {
+ final MethodHandle target = MethodHandles.lookup().findStatic(Main.class,
+ "filterReturnValue_voidTarget", MethodType.methodType(void.class));
+ final MethodHandle filter = MethodHandles.lookup().findStatic(Main.class,
+ "filterReturnValue_voidFilter", MethodType.methodType(int.class));
+
+ MethodHandle adapter = MethodHandles.filterReturnValue(target, filter);
+
+ int value = (int) adapter.invoke();
+ if (value != 42) {
+ System.out.println("Unexpected value: " + value);
+ }
+ }
+ }
+
public static void fail() {
System.out.println("FAIL");
Thread.dumpStack();
@@ -725,5 +800,3 @@
throw new AssertionError("assertEquals s1: " + s1 + ", s2: " + s2);
}
}
-
-
