TestFree.java

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/*
 * @test
 * @bug 8248421
 * @summary SystemCLinker should have a way to free memory allocated outside Java
 * @run testng/othervm --enable-native-access=ALL-UNNAMED TestFree
 */

import jdk.incubator.foreign.MemoryAccess;
import jdk.incubator.foreign.MemoryAddress;
import jdk.incubator.foreign.MemoryLayout;
import jdk.incubator.foreign.MemorySegment;
import jdk.incubator.foreign.ResourceScope;

import static jdk.incubator.foreign.CLinker.*;
import static org.testng.Assert.assertEquals;

public class TestFree {
    private static MemorySegment asArray(MemoryAddress addr, MemoryLayout layout, int numElements) {
        return addr.asSegment(numElements * layout.byteSize(), ResourceScope.globalScope());
    }

    public void test() throws Throwable {
        String str = "hello world";
        MemoryAddress addr = allocateMemory(str.length() + 1);
        MemorySegment seg = asArray(addr, C_CHAR, str.length() + 1);
        seg.copyFrom(MemorySegment.ofArray(str.getBytes()));
        MemoryAccess.setByteAtOffset(seg, str.length(), (byte)0);
        assertEquals(str, toJavaString(seg));
        freeMemory(addr);
    }
}