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package com.oracle.truffle.llvm.tests.interop;

import org.graalvm.polyglot.Context;
import org.graalvm.polyglot.Value;
import org.junit.Test;
import org.junit.runner.RunWith;

import com.oracle.truffle.llvm.runtime.nodes.others.LLVMUnreachableNode;
import com.oracle.truffle.llvm.tests.interop.values.NativeValue;
import com.oracle.truffle.tck.TruffleRunner;

import sun.misc.Unsafe;

@RunWith(TruffleRunner.class)
public class HostAllocatedNativePointer extends InteropTestBase {
    @SuppressWarnings("try")
    @Test
    public void testHostAllocatedNativePointer() {
        final Unsafe unsafeMem;

        try {
            java.lang.reflect.Field f = Unsafe.class.getDeclaredField("theUnsafe");
            f.setAccessible(true);
            unsafeMem = (Unsafe) f.get(null);
        } catch (NoSuchFieldException | IllegalAccessException e) {
            throw new LLVMUnreachableNode.LLVMUnreachableException();
        }

        String str = "Hello!";

        /* Allocate space for the string + NULL termination. */
        long buf = unsafeMem.allocateMemory(str.length() + 1);

        /* Fill the buffer. */
        for (int i = 0; i < str.length(); i++) {
            unsafeMem.putByte(buf + i, (byte) str.charAt(i));
        }

        /* NULL-terminate the target string. */
        unsafeMem.putByte(buf + str.length(), (byte) 0);

        NativeValue myRawPointer = new NativeValue(buf);

        try (Context context = Context.newBuilder().allowAllAccess(true).allowNativeAccess(true).build()) {
            Value file = loadTestBitcodeValue("strcmp.c");
            Value strcmp = file.getMember("compare_with_native");
            strcmp.execute(myRawPointer);
        }
    }
}