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 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  version 2 for more details (a copy is included in the LICENSE file that
 *  accompanied this code).
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import java.lang.foreign.Addressable;
import java.lang.foreign.Linker;
import java.lang.foreign.FunctionDescriptor;
import java.lang.foreign.MemoryLayout;
import java.lang.foreign.SegmentAllocator;
import java.lang.invoke.MethodHandle;
import java.util.List;
import java.util.function.Consumer;
import java.util.stream.Stream;

public class TestDowncallBase extends CallGeneratorHelper {

    static Linker LINKER = Linker.nativeLinker();

    Object doCall(Addressable symbol, SegmentAllocator allocator, FunctionDescriptor descriptor, Object[] args) throws Throwable {
        MethodHandle mh = downcallHandle(LINKER, symbol, allocator, descriptor);
        Object res = mh.invokeWithArguments(args);
        return res;
    }

    static FunctionDescriptor function(Ret ret, List<ParamType> params, List<StructFieldType> fields, List<MemoryLayout> prefix) {
        List<MemoryLayout> pLayouts = params.stream().map(p -> p.layout(fields)).toList();
        MemoryLayout[] paramLayouts = Stream.concat(prefix.stream(), pLayouts.stream()).toArray(MemoryLayout[]::new);
        return ret == Ret.VOID ?
                FunctionDescriptor.ofVoid(paramLayouts) :
                FunctionDescriptor.of(paramLayouts[prefix.size()], paramLayouts);
    }

    static Object[] makeArgs(List<ParamType> params, List<StructFieldType> fields, List<Consumer<Object>> checks, List<MemoryLayout> prefix) throws ReflectiveOperationException {
        Object[] args = new Object[prefix.size() + params.size()];
        int argNum = 0;
        for (MemoryLayout layout : prefix) {
            args[argNum++] = makeArg(layout, null, false);
        }
        for (int i = 0 ; i < params.size() ; i++) {
            args[argNum++] = makeArg(params.get(i).layout(fields), checks, i == 0);
        }
        return args;
    }
}