// Phase 1 step 1.15 (PLAN-FFI.md): `#jni_call(void)` codegen.
//
// `#jni_call(T)(env, target, "method_name", "(Sig)RetSig", args...)`
// dispatches a JNI instance-method call. The lowering hand-emits the
// vtable indirection:
//
//   ifs = *env                                  // JNINativeInterface*
//   cls = ifs->GetObjectClass(env, target)
//   mid = ifs->GetMethodID(env, cls, name, sig)
//   ifs->Call<Type>Method(env, target, mid, args...)
//
// Phase 1.17 introduces method-ID caching via static slots populated
// at module-init; this step keeps the per-call-site lookup.
//
// Host can't dlopen libjvm via the JIT, so the JNI body is gated
// behind `inline if OS == .android`. The macOS test path strips the
// body and prints "skipped"; the cross_compile.sh Android target
// verifies that the gated body actually compiles + links against
// libjvm in the Android sysroot.

#import "modules/std.sx";
#import "modules/build.sx";

// Android target requires a `#jni_main` Activity declaration to
// satisfy the entry-point check. An empty stub class is enough — this
// file is testing `#jni_call` lowering, not Activity wiring.
SxJniCallVoidStub :: #jni_main #jni_class("co/swipelab/sxjnicall/SxJniCallVoidStub") { }

main :: () -> i32 {
    inline if OS == .android {
        // Real Android entry passes env + target via the user's `onCreate`
        // / `#jni_attach`. For the cross-compile-only test we just need
        // the lowering to emit valid IR; runtime correctness is exercised
        // by the chess sx_android_query_safe_insets path.
        env    : *void = null;
        target : *void = null;
        #jni_env(env) {
            #jni_call(void)(target, "noop", "()V");
        }
    }
    inline if OS != .android {
        print("skipped (not android)\n");
    }
    0
}