jdk-24/test/jdk/java/lang/invoke/condy/CondyWithGarbageTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 8186046
 * @summary Stress test ldc to ensure HotSpot correctly manages oop maps
 * @library /lib/testlibrary/bytecode /java/lang/invoke/common
 * @build jdk.experimental.bytecode.BasicClassBuilder test.java.lang.invoke.lib.InstructionHelper
 * @run testng CondyWithGarbageTest
 * @run testng/othervm -XX:+UnlockDiagnosticVMOptions -XX:UseBootstrapCallInfo=3 CondyWithGarbageTest
 */


import jdk.experimental.bytecode.BasicClassBuilder;
import jdk.experimental.bytecode.Flag;
import jdk.experimental.bytecode.TypedCodeBuilder;
import org.testng.Assert;
import org.testng.annotations.Test;

import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;

import static java.lang.invoke.MethodType.methodType;
import static test.java.lang.invoke.lib.InstructionHelper.cref;
import static test.java.lang.invoke.lib.InstructionHelper.csym;

public class CondyWithGarbageTest {
    static final MethodHandles.Lookup L = MethodHandles.lookup();

    @Test
    public void testString() throws Throwable {
        MethodHandle mh = lcdStringBasher();
        int l = 0;
        for (int i = 0; i < 100000; i++) {
            l += +((String) mh.invoke()).length();
        }
        Assert.assertTrue(l > 0);
    }

    public static Object bsmString(MethodHandles.Lookup l,
                                   String constantName,
                                   Class<?> constantType) {
        return new StringBuilder(constantName).toString();
    }

    static MethodHandle lcdStringBasher() throws Exception {
        byte[] byteArray = new BasicClassBuilder(csym(L.lookupClass()) + "$Code$String", 55, 0)
                .withSuperclass("java/lang/Object")
                .withMethod("<init>", "()V", M ->
                        M.withFlags(Flag.ACC_PUBLIC)
                                .withCode(TypedCodeBuilder::new, C ->
                                        C.aload_0().invokespecial("java/lang/Object", "<init>", "()V", false).return_()
                                ))
                .withMethod("m", "()" + cref(String.class), M ->
                        M.withFlags(Flag.ACC_PUBLIC, Flag.ACC_STATIC)
                                .withCode(TypedCodeBuilder::new, C -> {
                                              C.new_(csym(StringBuilder.class))
                                                      .dup()
                                                      .invokespecial(csym(StringBuilder.class), "<init>", "()V", false)
                                                      .astore_0();

                                              for (int i = 10; i < 100; i++) {
                                                  ldcString(C, Integer.toString(i));
                                                  C.astore_1().aload_0().aload_1();
                                                  C.invokevirtual(csym(StringBuilder.class), "append", methodType(StringBuilder.class, String.class).toMethodDescriptorString(), false);
                                                  C.pop();
                                              }

                                              C.aload_0();
                                              C.invokevirtual(csym(StringBuilder.class), "toString", methodType(String.class).toMethodDescriptorString(), false);
                                              C.areturn();
                                          }
                                ))
                .build();

        Class<?> gc = L.defineClass(byteArray);
        return L.findStatic(gc, "m", methodType(String.class));
    }

    static void ldcString(TypedCodeBuilder<String, String, byte[], ?> C, String name) {
        C.ldc(name, cref(String.class),
              csym(L.lookupClass()),
              "bsmString",
              methodType(Object.class, MethodHandles.Lookup.class, String.class, Class.class).toMethodDescriptorString(),
              S -> {
              });
    }


    @Test
    public void testStringArray() throws Throwable {
        MethodHandle mh = lcdStringArrayBasher();
        int l = 0;
        for (int i = 0; i < 100000; i++) {
            l += +((String) mh.invoke()).length();
        }
        Assert.assertTrue(l > 0);
    }

    public static Object bsmStringArray(MethodHandles.Lookup l,
                                        String constantName,
                                        Class<?> constantType) {
        return new String[]{new StringBuilder(constantName).toString()};
    }

    static MethodHandle lcdStringArrayBasher() throws Exception {
        byte[] byteArray = new BasicClassBuilder(csym(L.lookupClass()) + "$Code$StringArray", 55, 0)
                .withSuperclass("java/lang/Object")
                .withMethod("<init>", "()V", M ->
                        M.withFlags(Flag.ACC_PUBLIC)
                                .withCode(TypedCodeBuilder::new, C ->
                                        C.aload_0().invokespecial("java/lang/Object", "<init>", "()V", false).return_()
                                ))
                .withMethod("m", "()" + cref(String.class), M ->
                        M.withFlags(Flag.ACC_PUBLIC, Flag.ACC_STATIC)
                                .withCode(TypedCodeBuilder::new, C -> {
                                              C.new_(csym(StringBuilder.class))
                                                      .dup()
                                                      .invokespecial(csym(StringBuilder.class), "<init>", "()V", false)
                                                      .astore_0();

                                              for (int i = 10; i < 100; i++) {
                                                  ldcStringArray(C, Integer.toString(i));
                                                  C.bipush(0).aaload().astore_1();
                                                  C.aload_0().aload_1();
                                                  C.invokevirtual(csym(StringBuilder.class), "append", methodType(StringBuilder.class, String.class).toMethodDescriptorString(), false);
                                                  C.pop();
                                              }

                                              C.aload_0();
                                              C.invokevirtual(csym(StringBuilder.class), "toString", methodType(String.class).toMethodDescriptorString(), false);
                                              C.areturn();
                                          }
                                ))
                .build();

        Class<?> gc = L.defineClass(byteArray);
        return L.findStatic(gc, "m", methodType(String.class));
    }

    static void ldcStringArray(TypedCodeBuilder<String, String, byte[], ?> C, String name) {
        C.ldc(name, cref(String[].class),
              csym(L.lookupClass()),
              "bsmStringArray",
              methodType(Object.class, MethodHandles.Lookup.class, String.class, Class.class).toMethodDescriptorString(),
              S -> {
              });
    }
}