// 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/compiler.sx";

main :: () -> s32 {
    inline if OS == .android {
        // Real Android entry passes env + target via android_main /
        // ANativeActivity (modules/platform/android.sx). 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 once Phase 1D for
        // sx_android_jni.c lands.
        env    : *void = null;
        target : *void = null;
        #jni_call(void)(env, target, "noop", "()V");
    }
    inline if OS != .android {
        print("skipped (not android)\n");
    }
    0;
}

// Android target requires `android_main` as the NDK entry — kept as
// a 3-line trampoline so this example can pass through
// `--target android` builds in `tests/cross_compile.sh`.
android_main :: (app: *void) {
    inline if OS == .android {
        main();
    }
}