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