_ Git - ldk-java/blob - java_strings.py

   1 from bindingstypes import *
   2 from enum import Enum
   3
   4 class Target(Enum):
   5     JAVA = 1,
   6     ANDROID = 2
   7
   8 class Consts:
   9     def __init__(self, DEBUG: bool, target: Target, **kwargs):
  10         self.target = target
  11         self.c_array_class_caches = set()
  12         self.c_type_map = dict(
  13             uint8_t = ['byte'],
  14             uint16_t = ['short'],
  15             uint32_t = ['int'],
  16             uint64_t = ['long'],
  17         )
  18
  19         self.to_hu_conv_templates = dict(
  20             ptr = '{human_type} {var_name}_hu_conv = new {human_type}(null, {var_name});',
  21             default = '{human_type} {var_name}_hu_conv = new {human_type}(null, {var_name});'
  22         )
  23
  24         self.bindings_header = """package org.ldk.impl;
  25 import org.ldk.enums.*;
  26
  27 public class bindings {
  28         public static class VecOrSliceDef {
  29                 public long dataptr;
  30                 public long datalen;
  31                 public long stride;
  32                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
  33                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
  34                 }
  35         }
  36         static {
  37                 System.loadLibrary(\"lightningjni\");
  38                 init(java.lang.Enum.class, VecOrSliceDef.class);
  39                 init_class_cache();
  40                 if (!get_lib_version_string().equals(get_ldk_java_bindings_version()))
  41                         throw new IllegalArgumentException("Compiled LDK library and LDK class failes do not match");
  42                 // Fetching the LDK versions from C also checks that the header and binaries match
  43                 get_ldk_c_bindings_version();
  44                 get_ldk_version();
  45         }
  46         static native void init(java.lang.Class c, java.lang.Class slicedef);
  47         static native void init_class_cache();
  48         static native String get_lib_version_string();
  49
  50         public static String get_ldk_java_bindings_version() {
  51                 return "<git_version_ldk_garbagecollected>";
  52         }
  53         public static native String get_ldk_c_bindings_version();
  54         public static native String get_ldk_version();
  55
  56         public static native boolean deref_bool(long ptr);
  57         public static native long deref_long(long ptr);
  58         public static native void free_heap_ptr(long ptr);
  59         public static native byte[] read_bytes(long ptr, long len);
  60         public static native byte[] get_u8_slice_bytes(long slice_ptr);
  61         public static native long bytes_to_u8_vec(byte[] bytes);
  62         public static native long new_txpointer_copy_data(byte[] txdata);
  63         public static native void txpointer_free(long ptr);
  64         public static native byte[] txpointer_get_buffer(long ptr);
  65         public static native long vec_slice_len(long vec);
  66         public static native long new_empty_slice_vec();
  67
  68 """
  69
  70         self.bindings_footer = "}\n"
  71
  72         self.util_fn_pfx = """package org.ldk.structs;
  73 import org.ldk.impl.bindings;
  74 import java.util.Arrays;
  75 import org.ldk.enums.*;
  76
  77 public class UtilMethods {
  78 """
  79         self.util_fn_sfx = "}"
  80         self.common_base = """package org.ldk.structs;
  81 import java.util.LinkedList;
  82 class CommonBase {
  83         long ptr;
  84         LinkedList<Object> ptrs_to = new LinkedList();
  85         protected CommonBase(long ptr) { this.ptr = ptr; }
  86 }
  87 """
  88
  89         self.c_file_pfx = """#include <jni.h>
  90 // On OSX jlong (ie long long) is not equivalent to int64_t, so we override here
  91 #define int64_t jlong
  92 #include \"org_ldk_impl_bindings.h\"
  93 #include <lightning.h>
  94 #include <string.h>
  95 #include <stdatomic.h>
  96 #include <stdlib.h>
  97
  98 """
  99
 100         if self.target == Target.ANDROID:
 101             self.c_file_pfx = self.c_file_pfx + """
 102 #include <android/log.h>
 103 #define DEBUG_PRINT(...) __android_log_print(ANDROID_LOG_ERROR, "LDK", __VA_ARGS__)
 104
 105 #include <unistd.h>
 106 #include <pthread.h>
 107 static void* redirect_stderr(void* ignored) {
 108         int pipes[2];
 109         pipe(pipes);
 110         dup2(pipes[1], STDERR_FILENO);
 111         char buf[8192];
 112         memset(buf, 0, 8192);
 113         ssize_t len;
 114         while ((len = read(pipes[0], buf, 8191)) > 0) {
 115                 DEBUG_PRINT("%s\\n", buf);
 116                 memset(buf, 0, 8192);
 117         }
 118         DEBUG_PRINT("End of stderr???\\n");
 119         return 0;
 120 }
 121 void __attribute__((constructor)) spawn_stderr_redirection() {
 122         pthread_t thread;
 123         pthread_create(&thread, NULL, &redirect_stderr, NULL);
 124 }
 125 """
 126         else:
 127             self.c_file_pfx = self.c_file_pfx + "#define DEBUG_PRINT(...) fprintf(stderr, __VA_ARGS__)\n"
 128
 129         if not DEBUG:
 130             self.c_file_pfx = self.c_file_pfx + """#define MALLOC(a, _) malloc(a)
 131 #define FREE(p) if ((uint64_t)(p) > 1024) { free(p); }
 132 #define DO_ASSERT(a) (void)(a)
 133 #define CHECK(a)
 134 """
 135         else:
 136             self.c_file_pfx = self.c_file_pfx + """#include <assert.h>
 137 // Always run a, then assert it is true:
 138 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 139 // Assert a is true or do nothing
 140 #define CHECK(a) DO_ASSERT(a)
 141
 142 void __attribute__((constructor)) debug_log_version() {
 143         if (check_get_ldk_version() == NULL)
 144                 DEBUG_PRINT("LDK version did not match the header we built against\\n");
 145         if (check_get_ldk_bindings_version() == NULL)
 146                 DEBUG_PRINT("LDK C Bindings version did not match the header we built against\\n");
 147         DEBUG_PRINT("Loaded LDK-Java Bindings with LDK %s and LDK-C-Bindings %s\\n", check_get_ldk_version(), check_get_ldk_bindings_version());
 148 }
 149
 150 // Running a leak check across all the allocations and frees of the JDK is a mess,
 151 // so instead we implement our own naive leak checker here, relying on the -wrap
 152 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 153 // and free'd in Rust or C across the generated bindings shared library.
 154 #include <threads.h>
 155 """
 156
 157             if self.target == Target.ANDROID:
 158                 self.c_file_pfx = self.c_file_pfx + """
 159 #include <unwind.h>
 160 #include <dlfcn.h>
 161
 162 // Implement the execinfo functions using _Unwind_backtrace. This seems to miss many Rust
 163 // symbols, so we only use it on Android, where execinfo.h is unavailable.
 164
 165 struct BacktraceState {
 166         void** current;
 167         void** end;
 168 };
 169 static _Unwind_Reason_Code unwind_callback(struct _Unwind_Context* context, void* arg) {
 170         struct BacktraceState* state = (struct BacktraceState*)arg;
 171         uintptr_t pc = _Unwind_GetIP(context);
 172         if (pc) {
 173                 if (state->current == state->end) {
 174                         return _URC_END_OF_STACK;
 175                 } else {
 176                         *state->current++ = (void*)(pc);
 177                 }
 178         }
 179         return _URC_NO_REASON;
 180 }
 181
 182 int backtrace(void** buffer, int max) {
 183         struct BacktraceState state = { buffer, buffer + max };
 184         _Unwind_Backtrace(unwind_callback, &state);
 185         return state.current - buffer;
 186 }
 187
 188 void backtrace_symbols_fd(void ** buffer, int count, int _fd) {
 189         for (int idx = 0; idx < count; ++idx) {
 190                 Dl_info info;
 191                 if (dladdr(buffer[idx], &info) && info.dli_sname) {
 192                         DEBUG_PRINT("%p: %s", buffer[idx], info.dli_sname);
 193                 } else {
 194                         DEBUG_PRINT("%p: ???", buffer[idx]);
 195                 }
 196         }
 197 }
 198 """
 199             else:
 200                 self.c_file_pfx = self.c_file_pfx + "#include <execinfo.h>\n"
 201             self.c_file_pfx = self.c_file_pfx + """
 202 #include <unistd.h>
 203 static mtx_t allocation_mtx;
 204
 205 void __attribute__((constructor)) init_mtx() {
 206         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
 207 }
 208
 209 #define BT_MAX 128
 210 typedef struct allocation {
 211         struct allocation* next;
 212         void* ptr;
 213         const char* struct_name;
 214         void* bt[BT_MAX];
 215         int bt_len;
 216         unsigned long alloc_len;
 217 } allocation;
 218 static allocation* allocation_ll = NULL;
 219
 220 void* __real_malloc(size_t len);
 221 void* __real_calloc(size_t nmemb, size_t len);
 222 static void new_allocation(void* res, const char* struct_name, size_t len) {
 223         allocation* new_alloc = __real_malloc(sizeof(allocation));
 224         new_alloc->ptr = res;
 225         new_alloc->struct_name = struct_name;
 226         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 227         new_alloc->alloc_len = len;
 228         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 229         new_alloc->next = allocation_ll;
 230         allocation_ll = new_alloc;
 231         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 232 }
 233 static void* MALLOC(size_t len, const char* struct_name) {
 234         void* res = __real_malloc(len);
 235         new_allocation(res, struct_name, len);
 236         return res;
 237 }
 238 void __real_free(void* ptr);
 239 static void alloc_freed(void* ptr) {
 240         allocation* p = NULL;
 241         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 242         allocation* it = allocation_ll;
 243         while (it->ptr != ptr) {
 244                 p = it; it = it->next;
 245                 if (it == NULL) {
 246                         DEBUG_PRINT("Tried to free unknown pointer %p at:\\n", ptr);
 247                         void* bt[BT_MAX];
 248                         int bt_len = backtrace(bt, BT_MAX);
 249                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 250                         DEBUG_PRINT("\\n\\n");
 251                         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 252                         return; // addrsan should catch malloc-unknown and print more info than we have
 253                 }
 254         }
 255         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 256         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 257         DO_ASSERT(it->ptr == ptr);
 258         __real_free(it);
 259 }
 260 static void FREE(void* ptr) {
 261         if ((uint64_t)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 262         alloc_freed(ptr);
 263         __real_free(ptr);
 264 }
 265
 266 void* __wrap_malloc(size_t len) {
 267         void* res = __real_malloc(len);
 268         new_allocation(res, "malloc call", len);
 269         return res;
 270 }
 271 void* __wrap_calloc(size_t nmemb, size_t len) {
 272         void* res = __real_calloc(nmemb, len);
 273         new_allocation(res, "calloc call", len);
 274         return res;
 275 }
 276 void __wrap_free(void* ptr) {
 277         if (ptr == NULL) return;
 278         alloc_freed(ptr);
 279         __real_free(ptr);
 280 }
 281
 282 void* __real_realloc(void* ptr, size_t newlen);
 283 void* __wrap_realloc(void* ptr, size_t len) {
 284         if (ptr != NULL) alloc_freed(ptr);
 285         void* res = __real_realloc(ptr, len);
 286         new_allocation(res, "realloc call", len);
 287         return res;
 288 }
 289 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 290         // Rust doesn't seem to use reallocarray currently
 291         DO_ASSERT(false);
 292 }
 293
 294 void __attribute__((destructor)) check_leaks() {
 295         unsigned long alloc_count = 0;
 296         unsigned long alloc_size = 0;
 297         DEBUG_PRINT("The following LDK-allocated blocks still remain.\\n");
 298         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 299         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 300         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 301                 DEBUG_PRINT("%s %p (%lu bytes) remains:\\n", a->struct_name, a->ptr, a->alloc_len);
 302                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 303                 DEBUG_PRINT("\\n\\n");
 304                 alloc_count++;
 305                 alloc_size += a->alloc_len;
 306         }
 307         DEBUG_PRINT("%lu allocations remained for %lu bytes.\\n", alloc_count, alloc_size);
 308         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 309         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 310 }
 311 """
 312         self.c_file_pfx = self.c_file_pfx + """
 313 static jmethodID ordinal_meth = NULL;
 314 static jmethodID slicedef_meth = NULL;
 315 static jclass slicedef_cls = NULL;
 316 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 317         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 318         CHECK(ordinal_meth != NULL);
 319         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 320         CHECK(slicedef_meth != NULL);
 321         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 322         CHECK(slicedef_cls != NULL);
 323 }
 324
 325 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 326         return *((bool*)ptr);
 327 }
 328 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 329         return *((long*)ptr);
 330 }
 331 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 332         FREE((void*)ptr);
 333 }
 334 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * env, jclass _b, jlong ptr, jlong len) {
 335         jbyteArray ret_arr = (*env)->NewByteArray(env, len);
 336         (*env)->SetByteArrayRegion(env, ret_arr, 0, len, (unsigned char*)ptr);
 337         return ret_arr;
 338 }
 339 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * env, jclass _b, jlong slice_ptr) {
 340         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 341         jbyteArray ret_arr = (*env)->NewByteArray(env, slice->datalen);
 342         (*env)->SetByteArrayRegion(env, ret_arr, 0, slice->datalen, slice->data);
 343         return ret_arr;
 344 }
 345 JNIEXPORT int64_t impl_bindings_bytes_1to_1u8_1vec (JNIEnv * env, jclass _b, jbyteArray bytes) {
 346         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 347         vec->datalen = (*env)->GetArrayLength(env, bytes);
 348         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 349         (*env)->GetByteArrayRegion (env, bytes, 0, vec->datalen, vec->data);
 350         return (uint64_t)vec;
 351 }
 352 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_txpointer_1get_1buffer (JNIEnv * env, jclass _b, jlong ptr) {
 353         LDKTransaction *txdata = (LDKTransaction*)ptr;
 354         LDKu8slice slice;
 355         slice.data = txdata->data;
 356         slice.datalen = txdata->datalen;
 357         return Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes(env, _b, (uint64_t)&slice);
 358 }
 359 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 360         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 361         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 362         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 363         txdata->data_is_owned = false;
 364         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
 365         return (uint64_t)txdata;
 366 }
 367 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_txpointer_1free (JNIEnv * env, jclass _b, jlong ptr) {
 368         LDKTransaction *tx = (LDKTransaction*)ptr;
 369         tx->data_is_owned = true;
 370         Transaction_free(*tx);
 371         FREE((void*)ptr);
 372 }
 373 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 374         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 375         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
 376         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
 377         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
 378         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
 379         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 380         return (uint64_t)vec->datalen;
 381 }
 382 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * env, jclass _b) {
 383         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
 384         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
 385         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
 386         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
 387         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
 388         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
 389         vec->data = NULL;
 390         vec->datalen = 0;
 391         return (uint64_t)vec;
 392 }
 393
 394 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 395 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 396 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 397 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 398
 399 _Static_assert(sizeof(jlong) == sizeof(int64_t), "We assume that j-types are the same as C types");
 400 _Static_assert(sizeof(jbyte) == sizeof(char), "We assume that j-types are the same as C types");
 401 _Static_assert(sizeof(void*) <= 8, "Pointers must fit into 64 bits");
 402
 403 typedef jlongArray int64_tArray;
 404 typedef jbyteArray int8_tArray;
 405
 406 static inline jstring str_ref_to_java(JNIEnv *env, const char* chars, size_t len) {
 407         // Sadly we need to create a temporary because Java can't accept a char* without a 0-terminator
 408         char* conv_buf = MALLOC(len + 1, "str conv buf");
 409         memcpy(conv_buf, chars, len);
 410         conv_buf[len] = 0;
 411         jstring ret = (*env)->NewStringUTF(env, conv_buf);
 412         FREE(conv_buf);
 413         return ret;
 414 }
 415 static inline LDKStr java_to_owned_str(JNIEnv *env, jstring str) {
 416         uint64_t str_len = (*env)->GetStringUTFLength(env, str);
 417         char* newchars = MALLOC(str_len + 1, "String chars");
 418         const char* jchars = (*env)->GetStringUTFChars(env, str, NULL);
 419         memcpy(newchars, jchars, str_len);
 420         newchars[str_len] = 0;
 421         (*env)->ReleaseStringUTFChars(env, str, jchars);
 422         LDKStr res = {
 423                 .chars = newchars,
 424                 .len = str_len,
 425                 .chars_is_owned = true
 426         };
 427         return res;
 428 }
 429
 430 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1lib_1version_1string(JNIEnv *env, jclass _c) {
 431         return str_ref_to_java(env, "<git_version_ldk_garbagecollected>", strlen("<git_version_ldk_garbagecollected>"));
 432 }
 433 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1ldk_1c_1bindings_1version(JNIEnv *env, jclass _c) {
 434         return str_ref_to_java(env, check_get_ldk_bindings_version(), strlen(check_get_ldk_bindings_version()));
 435 }
 436 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1ldk_1version(JNIEnv *env, jclass _c) {
 437         return str_ref_to_java(env, check_get_ldk_version(), strlen(check_get_ldk_version()));
 438 }
 439 """
 440
 441         self.hu_struct_file_prefix = """package org.ldk.structs;
 442
 443 import org.ldk.impl.bindings;
 444 import org.ldk.enums.*;
 445 import org.ldk.util.*;
 446 import java.util.Arrays;
 447
 448 """
 449         self.c_fn_ty_pfx = "JNIEXPORT "
 450         self.c_fn_args_pfx = "JNIEnv *env, jclass clz"
 451         self.file_ext = ".java"
 452         self.ptr_c_ty = "int64_t"
 453         self.ptr_native_ty = "long"
 454         self.result_c_ty = "jclass"
 455         self.ptr_arr = "jobjectArray"
 456         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 457
 458     def construct_jenv(self):
 459         res =  "JNIEnv *env;\n"
 460         res += "jint get_jenv_res = (*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_6);\n"
 461         res += "if (get_jenv_res == JNI_EDETACHED) {\n"
 462         if self.target == Target.ANDROID:
 463             res += "\tDO_ASSERT((*j_calls->vm)->AttachCurrentThread(j_calls->vm, &env, NULL) == JNI_OK);\n"
 464         else:
 465             res += "\tDO_ASSERT((*j_calls->vm)->AttachCurrentThread(j_calls->vm, (void**)&env, NULL) == JNI_OK);\n"
 466         res += "} else {\n"
 467         res += "\tDO_ASSERT(get_jenv_res == JNI_OK);\n"
 468         res += "}\n"
 469         return res
 470     def deconstruct_jenv(self):
 471         res = "if (get_jenv_res == JNI_EDETACHED) {\n"
 472         res += "\tDO_ASSERT((*j_calls->vm)->DetachCurrentThread(j_calls->vm) == JNI_OK);\n"
 473         res += "}\n"
 474         return res
 475
 476     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 477         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 478             return "(*env)->ReleasePrimitiveArrayCritical(env, " + arr_var + ", " + arr_ptr_var + ", 0)"
 479         return None
 480     def create_native_arr_call(self, arr_len, ty_info):
 481         if ty_info.c_ty == "int8_tArray":
 482             return "(*env)->NewByteArray(env, " + arr_len + ")"
 483         elif ty_info.subty.c_ty.endswith("Array"):
 484             clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 485             self.c_array_class_caches.add(clz_var)
 486             return "(*env)->NewObjectArray(env, " + arr_len + ", " + clz_var + "_clz, NULL);\n"
 487         else:
 488             return "(*env)->New" + ty_info.java_ty.strip("[]").title() + "Array(env, " + arr_len + ")"
 489     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 490         if ty_info.c_ty == "int8_tArray":
 491             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 492         else:
 493             assert False
 494     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 495         if ty_info.c_ty == "int8_tArray":
 496             if copy:
 497                 return "(*env)->GetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", " + dest_name + ")"
 498             else:
 499                 return "(*env)->GetByteArrayElements (env, " + arr_name + ", NULL)"
 500         elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 501             return "(*env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (env, " + arr_name + ", NULL)"
 502         else:
 503             return None
 504     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 505         if self.get_native_arr_contents(arr_name, "", "", ty_info, False) is None:
 506             return "(*env)->GetObjectArrayElement(env, " + arr_name + ", " + idxc + ")"
 507         else:
 508             assert False # Only called if above is None
 509     def get_native_arr_ptr_call(self, ty_info):
 510         if ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"):
 511             return None
 512         return ("(*env)->GetPrimitiveArrayCritical(env, ", ", NULL)")
 513     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 514         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 515             return None
 516         return "(*env)->SetObjectArrayElement(env, " + arr_name + ", " + idxc + ", " + entry_access + ")"
 517     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 518         if ty_info.c_ty == "int8_tArray":
 519             return "(*env)->ReleaseByteArrayElements(env, " + arr_name + ", (int8_t*)" + dest_name + ", 0);"
 520         else:
 521             return "(*env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements(env, " + arr_name + ", " + dest_name + ", 0)"
 522
 523     def str_ref_to_native_call(self, var_name, str_len):
 524         return "str_ref_to_java(env, " + var_name + ", " + str_len + ")"
 525     def str_ref_to_c_call(self, var_name):
 526         return "java_to_owned_str(env, " + var_name + ")"
 527
 528     def c_fn_name_define_pfx(self, fn_name, has_args):
 529         if has_args:
 530             return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz, "
 531         return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz"
 532
 533     def init_str(self):
 534         res = ""
 535         for ty in sorted(self.c_array_class_caches):
 536             res = res + "static jclass " + ty + "_clz = NULL;\n"
 537         res = res + "JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass clz) {\n"
 538         for ty in sorted(self.c_array_class_caches):
 539             res = res + "\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n"
 540             res = res + "\tCHECK(" + ty + "_clz != NULL);\n"
 541             res = res + "\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n"
 542         res = res + "}\n"
 543         return res
 544
 545     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 546         out_java_enum = "package org.ldk.enums;\n\n"
 547         out_java = ""
 548         out_c = ""
 549         out_c = out_c + "static inline LDK" + struct_name + " LDK" + struct_name + "_from_java(" + self.c_fn_args_pfx + ") {\n"
 550         out_c = out_c + "\tswitch ((*env)->CallIntMethod(env, clz, ordinal_meth)) {\n"
 551
 552         if enum_doc_comment is not None:
 553             out_java_enum += "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
 554         out_java_enum += "public enum " + struct_name + " {\n"
 555         ord_v = 0
 556         for var in variants:
 557             out_java_enum = out_java_enum + "\t" + var + ",\n"
 558             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 559             ord_v = ord_v + 1
 560         out_java_enum = out_java_enum + "\t; static native void init();\n"
 561         out_java_enum = out_java_enum + "\tstatic { init(); }\n"
 562         out_java_enum = out_java_enum + "}"
 563         out_java = out_java + "\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n"
 564         out_c = out_c + "\t}\n"
 565         out_c = out_c + "\tabort();\n"
 566         out_c = out_c + "}\n"
 567
 568         out_c = out_c + "static jclass " + struct_name + "_class = NULL;\n"
 569         for var in variants:
 570             out_c = out_c + "static jfieldID " + struct_name + "_" + var + " = NULL;\n"
 571         out_c = out_c + self.c_fn_ty_pfx + "void JNICALL Java_org_ldk_enums_" + struct_name.replace("_", "_1") + "_init (" + self.c_fn_args_pfx + ") {\n"
 572         out_c = out_c + "\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n"
 573         out_c = out_c + "\tCHECK(" + struct_name + "_class != NULL);\n"
 574         for var in variants:
 575             out_c = out_c + "\t" + struct_name + "_" + var + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + var + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n"
 576             out_c = out_c + "\tCHECK(" + struct_name + "_" + var + " != NULL);\n"
 577         out_c = out_c + "}\n"
 578         out_c = out_c + "static inline jclass LDK" + struct_name + "_to_java(JNIEnv *env, LDK" + struct_name + " val) {\n"
 579         out_c = out_c + "\tswitch (val) {\n"
 580         ord_v = 0
 581         for var in variants:
 582             out_c = out_c + "\t\tcase " + var + ":\n"
 583             out_c = out_c + "\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + var + ");\n"
 584             ord_v = ord_v + 1
 585         out_c = out_c + "\t\tdefault: abort();\n"
 586         out_c = out_c + "\t}\n"
 587         out_c = out_c + "}\n\n"
 588
 589         return (out_c, out_java_enum, out_java)
 590
 591     def c_unitary_enum_to_native_call(self, ty_info):
 592         return (ty_info.rust_obj + "_to_java(env, ", ")")
 593     def native_unitary_enum_to_c_call(self, ty_info):
 594         return (ty_info.rust_obj + "_from_java(env, ", ")")
 595
 596     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 597         out_c = ""
 598         for var in variants:
 599             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 600             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 601         out_c = out_c + self.c_fn_ty_pfx + "void JNICALL Java_org_ldk_impl_bindings_00024" + struct_name.replace("_", "_1") + "_init (" + self.c_fn_args_pfx + ") {\n"
 602         for var_name in variants:
 603             out_c = out_c + "\t" + struct_name + "_" + var_name + "_class =\n"
 604             if self.target == Target.ANDROID:
 605                 out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"org/ldk/impl/bindings$" + struct_name + "$" + var_name + "\"));\n"
 606             else:
 607                 out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n"
 608             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 609             out_c = out_c + "\t" + struct_name + "_" + var_name + "_meth = (*env)->GetMethodID(env, " + struct_name + "_" + var_name + "_class, \"<init>\", \"(" + init_meth_jty_strs[var_name] + ")V\");\n"
 610             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 611         out_c = out_c + "}\n"
 612         return out_c
 613
 614     def c_complex_enum_pass_ty(self, struct_name):
 615         return "jobject"
 616
 617     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 618         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 619         for param in c_params:
 620             ret = ret + ", " + param
 621         return ret + ")"
 622
 623     def native_c_map_trait(self, struct_name, field_vars, flattened_field_vars, field_fns, trait_doc_comment):
 624         out_java_trait = ""
 625         out_java = ""
 626
 627         # First generate most of the Java code, note that we need information about java method argument strings for C
 628         out_java_trait = out_java_trait + self.hu_struct_file_prefix
 629         if trait_doc_comment is not None:
 630             out_java_trait += "/**\n * " + trait_doc_comment.replace("\n", "\n * ") + "\n */\n"
 631         out_java_trait += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
 632         out_java_trait = out_java_trait + "public class " + struct_name.replace("LDK","") + " extends CommonBase {\n"
 633         out_java_trait = out_java_trait + "\tfinal bindings." + struct_name + " bindings_instance;\n"
 634         out_java_trait = out_java_trait + "\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n"
 635         out_java_trait = out_java_trait + "\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg"
 636         for var in flattened_field_vars:
 637             if isinstance(var, ConvInfo):
 638                 out_java_trait = out_java_trait + ", " + var.java_hu_ty + " " + var.arg_name
 639             else:
 640                 out_java_trait = out_java_trait + ", bindings." + var[0] + " " + var[1]
 641         out_java_trait = out_java_trait + ") {\n"
 642         out_java_trait = out_java_trait + "\t\tsuper(bindings." + struct_name + "_new(arg"
 643         for var in flattened_field_vars:
 644             if isinstance(var, ConvInfo):
 645                 if var.from_hu_conv is not None:
 646                     out_java_trait = out_java_trait + ", " + var.from_hu_conv[0]
 647                 else:
 648                     out_java_trait = out_java_trait + ", " + var.arg_name
 649             else:
 650                 out_java_trait = out_java_trait + ", " + var[1]
 651         out_java_trait = out_java_trait + "));\n"
 652         out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(arg);\n"
 653         for var in flattened_field_vars:
 654             if isinstance(var, ConvInfo):
 655                 if var.from_hu_conv is not None and var.from_hu_conv[1] != "":
 656                     out_java_trait = out_java_trait + "\t\t" + var.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n"
 657             else:
 658                 out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(" + var[1] + ");\n"
 659         out_java_trait = out_java_trait + "\t\tthis.bindings_instance = arg;\n"
 660         out_java_trait = out_java_trait + "\t}\n"
 661         out_java_trait = out_java_trait + "\t@Override @SuppressWarnings(\"deprecation\")\n"
 662         out_java_trait = out_java_trait + "\tprotected void finalize() throws Throwable {\n"
 663         out_java_trait = out_java_trait + "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n"
 664         out_java_trait = out_java_trait + "\t}\n\n"
 665
 666         java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
 667         java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 668         for var in flattened_field_vars:
 669             if isinstance(var, ConvInfo):
 670                 java_trait_constr = java_trait_constr + ", " + var.java_hu_ty + " " + var.arg_name
 671             else:
 672                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 673                 # Java-implemented version, so we require users pass a Java implementation here :/
 674                 java_trait_constr = java_trait_constr + ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 675         java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 676         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
 677         out_java_trait = out_java_trait + "\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n"
 678         out_java = out_java + "\tpublic interface " + struct_name + " {\n"
 679         java_meths = []
 680         for fn_line in field_fns:
 681             java_meth_descr = "("
 682             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 683                 out_java = out_java + "\t\t " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 684                 java_trait_constr = java_trait_constr + "\t\t\t@Override public " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 685                 out_java_trait += "\t\t/**\n\t\t * " + fn_line.docs.replace("\n", "\n\t\t * ") + "\n\t\t */\n"
 686                 out_java_trait = out_java_trait + "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_line.fn_name + "("
 687
 688                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 689                     if idx >= 1:
 690                         out_java = out_java + ", "
 691                         java_trait_constr = java_trait_constr + ", "
 692                         out_java_trait = out_java_trait + ", "
 693                     out_java = out_java + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 694                     out_java_trait = out_java_trait + arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name
 695                     java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 696                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 697                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 698                 java_meths.append((fn_line.fn_name, java_meth_descr))
 699
 700                 out_java = out_java + ");\n"
 701                 out_java_trait = out_java_trait + ");\n"
 702                 java_trait_constr = java_trait_constr + ") {\n"
 703
 704                 for arg_info in fn_line.args_ty:
 705                     if arg_info.to_hu_conv is not None:
 706                         java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 707
 708                 if fn_line.ret_ty_info.java_ty != "void":
 709                     java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 710                 else:
 711                     java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.fn_name + "("
 712
 713                 for idx, arg_info in enumerate(fn_line.args_ty):
 714                     if idx != 0:
 715                         java_trait_constr = java_trait_constr + ", "
 716                     if arg_info.to_hu_conv_name is not None:
 717                         java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
 718                     else:
 719                         java_trait_constr = java_trait_constr + arg_info.arg_name
 720
 721                 java_trait_constr = java_trait_constr + ");\n"
 722                 if fn_line.ret_ty_info.java_ty != "void":
 723                     if fn_line.ret_ty_info.from_hu_conv is not None:
 724                         java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_ty + " result = " + fn_line.ret_ty_info.from_hu_conv[0] + ";\n"
 725                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 726                             java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.from_hu_conv[1].replace("this", "impl_holder.held") + ";\n"
 727                         #if fn_line.ret_ty_info.rust_obj in result_types:
 728                         java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
 729                     else:
 730                         java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
 731                 java_trait_constr = java_trait_constr + "\t\t\t}\n"
 732         java_trait_constr = java_trait_constr + "\t\t}"
 733         for var in field_vars:
 734             if isinstance(var, ConvInfo):
 735                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 736             else:
 737                 java_trait_constr += ", " + var[1] + ".new_impl(" + var[1] + "_impl"
 738                 for suparg in var[2]:
 739                     if isinstance(suparg, ConvInfo):
 740                         java_trait_constr += ", " + suparg.arg_name
 741                     else:
 742                         java_trait_constr += ", " + suparg[1]
 743                 java_trait_constr += ").bindings_instance"
 744                 for suparg in var[2]:
 745                     if isinstance(suparg, ConvInfo):
 746                         java_trait_constr += ", " + suparg.arg_name
 747                     else:
 748                         java_trait_constr += ", " + suparg[1]
 749         out_java_trait = out_java_trait + "\t}\n"
 750         out_java_trait = out_java_trait + java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 751
 752         out_java = out_java + "\t}\n"
 753
 754         out_java = out_java + "\tpublic static native long " + struct_name + "_new(" + struct_name + " impl"
 755         for var in flattened_field_vars:
 756             if isinstance(var, ConvInfo):
 757                 out_java = out_java + ", " + var.java_ty + " " + var.arg_name
 758             else:
 759                 out_java = out_java + ", " + var[0] + " " + var[1]
 760         out_java = out_java + ");\n"
 761
 762         # Now that we've written out our java code (and created java_meths), generate C
 763         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 764         out_c = out_c + "\tatomic_size_t refcnt;\n"
 765         out_c = out_c + "\tJavaVM *vm;\n"
 766         out_c = out_c + "\tjweak o;\n"
 767         for var in flattened_field_vars:
 768             if isinstance(var, ConvInfo):
 769                 # We're a regular ol' field
 770                 pass
 771             else:
 772                 # We're a supertrait
 773                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 774         for fn in field_fns:
 775             if fn.fn_name != "free" and fn.fn_name != "clone":
 776                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 777         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 778
 779         for fn_line in field_fns:
 780             if fn_line.fn_name == "free":
 781                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 782                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 783                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 784                 out_c += "\t\t" + self.construct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 785                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 786                 out_c += "\t\t" + self.deconstruct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 787                 out_c = out_c + "\t\tFREE(j_calls);\n"
 788                 out_c = out_c + "\t}\n}\n"
 789
 790         for idx, fn_line in enumerate(field_fns):
 791             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 792                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 793                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 794                 if fn_line.self_is_const:
 795                     out_c = out_c + "const void* this_arg"
 796                 else:
 797                     out_c = out_c + "void* this_arg"
 798
 799                 for idx, arg in enumerate(fn_line.args_ty):
 800                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 801
 802                 out_c = out_c + ") {\n"
 803                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 804                 out_c += "\t" + self.construct_jenv().replace("\n", "\n\t").strip() + "\n"
 805
 806                 for arg_info in fn_line.args_ty:
 807                     if arg_info.ret_conv is not None:
 808                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 809                         out_c = out_c + arg_info.arg_name
 810                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 811
 812                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 813                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 814                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 815                 elif fn_line.ret_ty_info.c_ty == "void":
 816                     out_c += "\t(*env)->Call" + fn_line.ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 817                 elif not fn_line.ret_ty_info.passed_as_ptr:
 818                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->Call" + fn_line.ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 819                 else:
 820                     out_c = out_c + "\t" + fn_line.ret_ty_info.rust_obj + "* ret = (" + fn_line.ret_ty_info.rust_obj + "*)(*env)->CallLongMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 821
 822                 for idx, arg_info in enumerate(fn_line.args_ty):
 823                     if arg_info.ret_conv is not None:
 824                         out_c = out_c + ", " + arg_info.ret_conv_name
 825                     else:
 826                         out_c = out_c + ", " + arg_info.arg_name
 827                 out_c = out_c + ");\n"
 828                 if fn_line.ret_ty_info.arg_conv is not None:
 829                     out_c += "\t" + fn_line.ret_ty_info.arg_conv.replace("\n", "\n\t") + "\n"
 830                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
 831                     out_c += "\treturn " + fn_line.ret_ty_info.arg_conv_name + ";\n"
 832                 else:
 833                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
 834                     if not fn_line.ret_ty_info.passed_as_ptr and fn_line.ret_ty_info.c_ty != "void":
 835                         out_c += "\treturn ret;\n"
 836
 837                 out_c = out_c + "}\n"
 838
 839         # Write out a clone function whether we need one or not, as we use them in moving to rust
 840         out_c = out_c + "static void* " + struct_name + "_JCalls_clone(const void* this_arg) {\n"
 841         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 842         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 843         for var in field_vars:
 844             if not isinstance(var, ConvInfo):
 845                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 846         out_c = out_c + "\treturn (void*) this_arg;\n"
 847         out_c = out_c + "}\n"
 848
 849         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 850         for var in flattened_field_vars:
 851             if isinstance(var, ConvInfo):
 852                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 853             else:
 854                 out_c = out_c + ", jobject " + var[1]
 855         out_c = out_c + ") {\n"
 856
 857         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 858         out_c = out_c + "\tCHECK(c != NULL);\n"
 859         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 860         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 861         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 862         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 863
 864         for (fn_name, java_meth_descr) in java_meths:
 865             if fn_name != "free" and fn_name != "clone":
 866                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 867                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 868
 869         for var in flattened_field_vars:
 870             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 871                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 872         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 873         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 874         for fn_line in field_fns:
 875             if fn_line.fn_name != "free" and fn_line.fn_name != "clone":
 876                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 877             elif fn_line.fn_name == "free":
 878                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 879             else:
 880                 out_c = out_c + "\t\t.clone = " + struct_name + "_JCalls_clone,\n"
 881         for var in field_vars:
 882             if isinstance(var, ConvInfo):
 883                 if var.arg_conv_name is not None:
 884                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 885                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 886                 else:
 887                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 888                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 889             else:
 890                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1]
 891                 for suparg in var[2]:
 892                     if isinstance(suparg, ConvInfo):
 893                         out_c = out_c + ", " + suparg.arg_name
 894                     else:
 895                         out_c = out_c + ", " + suparg[1]
 896                 out_c += "),\n"
 897         out_c = out_c + "\t};\n"
 898         for var in flattened_field_vars:
 899             if not isinstance(var, ConvInfo):
 900                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 901         out_c = out_c + "\treturn ret;\n"
 902         out_c = out_c + "}\n"
 903
 904         out_c = out_c + self.c_fn_ty_pfx + "int64_t " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "jobject o"
 905         for var in flattened_field_vars:
 906             if isinstance(var, ConvInfo):
 907                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 908             else:
 909                 out_c = out_c + ", jobject " + var[1]
 910         out_c = out_c + ") {\n"
 911         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 912         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 913         for var in flattened_field_vars:
 914             if isinstance(var, ConvInfo):
 915                 out_c = out_c + ", " + var.arg_name
 916             else:
 917                 out_c = out_c + ", " + var[1]
 918         out_c = out_c + ");\n"
 919         out_c = out_c + "\treturn (uint64_t)res_ptr;\n"
 920         out_c = out_c + "}\n"
 921
 922         return (out_java, out_java_trait, out_c)
 923
 924     def trait_struct_inc_refcnt(self, ty_info):
 925         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 926         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 927         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_clone(" + ty_info.var_name + "_conv.this_arg);\n}"
 928         return base_conv
 929
 930     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
 931         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
 932         out_java_enum = ""
 933         out_java = ""
 934         out_c = ""
 935
 936         out_java_enum += (self.hu_struct_file_prefix)
 937         out_java_enum += "\n/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
 938         out_java_enum += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
 939         out_java_enum += ("public class " + java_hu_type + " extends CommonBase {\n")
 940         out_java_enum += ("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
 941         out_java_enum += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
 942         out_java_enum += ("\tprotected void finalize() throws Throwable {\n")
 943         out_java_enum += ("\t\tsuper.finalize();\n")
 944         out_java_enum += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK", "") + "_free(ptr); }\n")
 945         out_java_enum += ("\t}\n")
 946         out_java_enum += ("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
 947         out_java_enum += ("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
 948         java_hu_subclasses = ""
 949
 950         init_meth_jty_strs = {}
 951
 952         out_java +=  ("\tpublic static class " + struct_name + " {\n")
 953         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
 954         for var in variant_list:
 955             out_java +=  ("\t\tpublic final static class " + var.var_name + " extends " + struct_name + " {\n")
 956             java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var.var_name + " extends " + java_hu_type + " {\n"
 957             out_java_enum += ("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var.var_name + ".class) {\n")
 958             out_java_enum += ("\t\t\treturn new " + var.var_name + "(ptr, (bindings." + struct_name + "." + var.var_name + ")raw_val);\n")
 959             init_meth_jty_str = ""
 960             init_meth_params = ""
 961             init_meth_body = ""
 962             hu_conv_body = ""
 963             for idx, field_ty in enumerate(var.fields):
 964                 if idx > 0:
 965                     init_meth_params = init_meth_params + ", "
 966
 967                 if field_ty.java_hu_ty == var.var_name:
 968                     field_path = field_ty.java_fn_ty_arg.strip("L;").replace("/", ".")
 969                     out_java += "\t\t\tpublic " + field_path + " " + field_ty.arg_name + ";\n"
 970                     java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_path + " " + field_ty.arg_name + ";\n"
 971                     init_meth_params = init_meth_params + field_path + " " + field_ty.arg_name
 972                 else:
 973                     out_java += "\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n"
 974                     java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
 975                     init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
 976                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
 977                 if field_ty.to_hu_conv is not None:
 978                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 979                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 980                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 981                 else:
 982                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 983                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
 984             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
 985             out_java +=  (init_meth_body)
 986             out_java +=  ("}\n")
 987             out_java += ("\t\t}\n")
 988             out_java_enum += ("\t\t}\n")
 989             java_hu_subclasses = java_hu_subclasses + "\t\tprivate " + var.var_name + "(long ptr, bindings." + struct_name + "." + var.var_name + " obj) {\n\t\t\tsuper(null, ptr);\n"
 990             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 991             java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
 992             init_meth_jty_strs[var.var_name] = init_meth_jty_str
 993         out_java += ("\t\tstatic native void init();\n")
 994         out_java += ("\t}\n")
 995         out_java_enum += ("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
 996         out_java_enum += (java_hu_subclasses)
 997         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
 998         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
 999
1000         out_c += (self.c_complex_enum_pfx(struct_name, [x.var_name for x in variant_list], init_meth_jty_strs))
1001
1002         out_c += (self.c_fn_ty_pfx + self.c_complex_enum_pass_ty(struct_name) + " " + self.c_fn_name_define_pfx(struct_name + "_ref_from_ptr", True) + self.ptr_c_ty + " ptr) {\n")
1003         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n")
1004         out_c += ("\tswitch(obj->tag) {\n")
1005         for var in variant_list:
1006             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
1007             c_params = []
1008             for idx, field_map in enumerate(var.fields):
1009                 if field_map.ret_conv is not None:
1010                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1011                     if var.tuple_variant:
1012                         out_c += "obj->" + camel_to_snake(var.var_name)
1013                     else:
1014                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
1015                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1016                     c_params.append(field_map.ret_conv_name)
1017                 else:
1018                     if var.tuple_variant:
1019                         c_params.append("obj->" + camel_to_snake(var.var_name))
1020                     else:
1021                         c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
1022             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
1023             out_c += ("\t\t}\n")
1024         out_c += ("\t\tdefault: abort();\n")
1025         out_c += ("\t}\n}\n")
1026         return (out_java, out_java_enum, out_c)
1027
1028     def map_opaque_struct(self, struct_name, struct_doc_comment):
1029         out_opaque_struct_human = ""
1030         out_opaque_struct_human += self.hu_struct_file_prefix
1031         out_opaque_struct_human += "\n/**\n * " + struct_doc_comment.replace("\n", "\n * ") + "\n */\n"
1032         out_opaque_struct_human += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
1033         out_opaque_struct_human += ("public class " + struct_name.replace("LDK","") + " extends CommonBase")
1034         if struct_name.startswith("LDKLocked"):
1035             out_opaque_struct_human += (" implements AutoCloseable")
1036         out_opaque_struct_human += (" {\n")
1037         out_opaque_struct_human += ("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
1038         if struct_name.startswith("LDKLocked"):
1039             out_opaque_struct_human += ("\t@Override public void close() {\n")
1040         else:
1041             out_opaque_struct_human += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
1042             out_opaque_struct_human += ("\tprotected void finalize() throws Throwable {\n")
1043             out_opaque_struct_human += ("\t\tsuper.finalize();\n")
1044         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
1045         out_opaque_struct_human += ("\t}\n\n")
1046         return out_opaque_struct_human
1047
1048
1049     def map_function(self, argument_types, c_call_string, method_name, return_type_info, struct_meth, default_constructor_args, takes_self, takes_self_as_ref, args_known, type_mapping_generator, doc_comment):
1050         out_java = ""
1051         out_c = ""
1052         out_java_struct = None
1053
1054         out_java += ("\tpublic static native ")
1055         out_c += (self.c_fn_ty_pfx)
1056         out_c += (return_type_info.c_ty)
1057         out_java += (return_type_info.java_ty)
1058         if return_type_info.ret_conv is not None:
1059             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1060         out_java += (" " + method_name + "(")
1061         have_args = len(argument_types) > 1 or (len(argument_types) > 0 and argument_types[0].c_ty != "void")
1062         out_c += (" " + self.c_fn_name_define_pfx(method_name, have_args))
1063
1064         for idx, arg_conv_info in enumerate(argument_types):
1065             if idx != 0:
1066                 out_java += (", ")
1067                 out_c += (", ")
1068             if arg_conv_info.c_ty != "void":
1069                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1070                 out_java += (arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
1071
1072         out_java_struct = ""
1073         if not args_known:
1074             out_java_struct += ("\t// Skipped " + method_name + "\n")
1075         else:
1076             meth_n = method_name[len(struct_meth) + 1 if len(struct_meth) != 0 else 0:].strip("_")
1077             if doc_comment is not None:
1078                 out_java_struct += "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
1079             if not takes_self:
1080                 if meth_n == "new":
1081                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " of("
1082                 elif meth_n == "default":
1083                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " with_default("
1084                 else:
1085                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " " + meth_n + "("
1086             else:
1087                 out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
1088             for idx, arg in enumerate(argument_types):
1089                 if idx != 0:
1090                     if not takes_self or idx > 1:
1091                         out_java_struct += ", "
1092                 elif takes_self:
1093                     continue
1094                 if arg.java_ty != "void":
1095                     if arg.arg_name in default_constructor_args:
1096                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1097                             if explode_idx != 0:
1098                                 out_java_struct += (", ")
1099                             out_java_struct += (
1100                                 explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
1101                     else:
1102                         out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
1103         out_java += (");\n")
1104         out_c += (") {\n")
1105         if out_java_struct is not None:
1106             out_java_struct += (") {\n")
1107         for info in argument_types:
1108             if info.arg_conv is not None:
1109                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1110         if return_type_info.ret_conv is not None:
1111             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1112         elif return_type_info.c_ty != "void":
1113             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1114         else:
1115             out_c += ("\t")
1116         if c_call_string is None:
1117             out_c += (method_name + "(")
1118         else:
1119             out_c += (c_call_string)
1120         for idx, info in enumerate(argument_types):
1121             if info.arg_conv_name is not None:
1122                 if idx != 0:
1123                     out_c += (", ")
1124                 elif c_call_string is not None:
1125                     continue
1126                 out_c += (info.arg_conv_name)
1127         out_c += (")")
1128         if return_type_info.ret_conv is not None:
1129             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1130         else:
1131             out_c += (";")
1132         for info in argument_types:
1133             if info.arg_conv_cleanup is not None:
1134                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1135         if return_type_info.ret_conv is not None:
1136             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1137         elif return_type_info.c_ty != "void":
1138             out_c += ("\n\treturn ret_val;")
1139         out_c += ("\n}\n\n")
1140
1141         if args_known:
1142             out_java_struct += ("\t\t")
1143             if return_type_info.java_ty != "void":
1144                 out_java_struct += (return_type_info.java_ty + " ret = ")
1145             out_java_struct += ("bindings." + method_name + "(")
1146             for idx, info in enumerate(argument_types):
1147                 if idx != 0:
1148                     out_java_struct += (", ")
1149                 if idx == 0 and takes_self:
1150                     out_java_struct += ("this.ptr")
1151                 elif info.arg_name in default_constructor_args:
1152                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1153                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1154                         if explode_idx != 0:
1155                             out_java_struct += (", ")
1156                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1157                         if explode_arg.from_hu_conv is not None:
1158                             out_java_struct += (
1159                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1160                         else:
1161                             out_java_struct += (expl_arg_name)
1162                     out_java_struct += (")")
1163                 elif info.from_hu_conv is not None:
1164                     out_java_struct += (info.from_hu_conv[0])
1165                 else:
1166                     out_java_struct += (info.arg_name)
1167             out_java_struct += (");\n")
1168             if return_type_info.to_hu_conv is not None:
1169                 if not takes_self:
1170                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1171                                                                                                                return_type_info.to_hu_conv_name) + "\n")
1172                 else:
1173                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1174
1175             for idx, info in enumerate(argument_types):
1176                 if idx == 0 and takes_self:
1177                     pass
1178                 elif info.arg_name in default_constructor_args:
1179                     for explode_arg in default_constructor_args[info.arg_name]:
1180                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1181                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1182                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1183                                                                                                expl_arg_name).replace(
1184                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1185                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1186                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1187                         out_java_struct += (
1188                             "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1189                     else:
1190                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1191
1192             if takes_self and not takes_self_as_ref:
1193                 out_java_struct += "\t\t" + argument_types[0].from_hu_conv[1].replace("\n", "\n\t\t").replace("this_arg", "this") + ";\n"
1194             if return_type_info.to_hu_conv_name is not None:
1195                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1196             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1197                 out_java_struct += ("\t\treturn ret;\n")
1198             out_java_struct += ("\t}\n\n")
1199
1200         return (out_java, out_c, out_java_struct)