test/jdk/java/lang/invoke/condy/CondyWrongType.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/*
 * @test
 * @bug 8186046
 * @summary Test bootstrap methods returning the wrong type
 * @library /lib/testlibrary/bytecode /java/lang/invoke/common
 * @build jdk.experimental.bytecode.BasicClassBuilder test.java.lang.invoke.lib.InstructionHelper
 * @run testng CondyWrongType
 * @run testng/othervm -XX:+UnlockDiagnosticVMOptions -XX:UseBootstrapCallInfo=3 CondyWrongType
 */

import org.testng.Assert;
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import test.java.lang.invoke.lib.InstructionHelper;

import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.invoke.WrongMethodTypeException;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import static java.lang.invoke.MethodType.methodType;

public class CondyWrongType {

    @DataProvider
    public Object[][] primitivesProvider() throws Exception {
        Map<String, Class<?>> typeMap = Map.of(
                "B", byte.class,
                "C", char.class,
                "D", double.class,
                "F", float.class,
                "I", int.class,
                "J", long.class,
                "S", short.class,
                "Z", boolean.class
                );

        List<Object[]> cases = new ArrayList<>();
        for (String name : typeMap.keySet()) {
            MethodHandle zero = MethodHandles.zero(typeMap.get(name));
            for (String type : typeMap.keySet()) {
                // Use asType transformation to detect if primitive conversion
                // is supported from the BSM value type to the dynamic constant type
                boolean pass = true;
                try {
                    zero.asType(MethodType.methodType(typeMap.get(type)));
                }
                catch (WrongMethodTypeException e) {
                    pass = false;
                }
                cases.add(new Object[] { name, type, pass});
            }
        }

        return cases.stream().toArray(Object[][]::new);
    }

    @Test(dataProvider = "primitivesProvider")
    public void testPrimitives(String name, String type, boolean pass) {
        test(name, type, pass);
    }

    @Test
    public void testReferences() {
        test("String", "Ljava/math/BigDecimal;", false);
        test("BigDecimal", "Ljava/lang/String;", false);
    }

    @Test
    public void testReferenceAndPrimitives() {
        test("String", "B", false);
        test("String", "C", false);
        test("String", "D", false);
        test("String", "F", false);
        test("String", "I", false);
        test("String", "J", false);
        test("String", "S", false);
        test("String", "Z", false);
    }

    static void test(String name, String type, boolean pass) {
        MethodHandle mh = caster(name, type);
        Throwable caught = null;
        try {
            mh.invoke();
        }
        catch (Throwable t) {
            caught = t;
        }

        if (caught == null) {
            if (pass) {
                return;
            }
            else {
                Assert.fail("Throwable expected");
            }
        }
        else if (pass) {
            Assert.fail("Throwable not expected");
        }

        Assert.assertTrue(BootstrapMethodError.class.isAssignableFrom(caught.getClass()));
        caught = caught.getCause();
        Assert.assertNotNull(caught);
        Assert.assertTrue(ClassCastException.class.isAssignableFrom(caught.getClass()));
    }

    static Object bsm(MethodHandles.Lookup l, String name, Class<?> type) {
        switch (name) {
            case "B":
                return (byte) 1;
            case "C":
                return 'A';
            case "D":
                return 1.0;
            case "F":
                return 1.0f;
            case "I":
                return 1;
            case "J":
                return 1L;
            case "S":
                return (short) 1;
            case "Z":
                return true;
            case "String":
                return "string";
            case "BigDecimal":
                return BigDecimal.ONE;
            default:
                throw new UnsupportedOperationException();
        }
    }

    static MethodHandle caster(String name, String type) {
        try {
            return InstructionHelper.ldcDynamicConstant(
                    MethodHandles.lookup(),
                    name, type,
                    "bsm", methodType(Object.class, MethodHandles.Lookup.class, String.class, Class.class).toMethodDescriptorString(),
                    S -> { });
        } catch (Exception e) {
            throw new Error(e);
        }
    }
}