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

   1 from bindingstypes import *
   2 from enum import Enum
   3 import sys
   4
   5 class Target(Enum):
   6     JAVA = 1,
   7     ANDROID = 2
   8
   9 class Consts:
  10     def __init__(self, DEBUG: bool, target: Target, **kwargs):
  11         self.target = target
  12         self.c_array_class_caches = set()
  13         self.c_type_map = dict(
  14             uint8_t = ['byte'],
  15             uint16_t = ['short'],
  16             uint32_t = ['int'],
  17             uint64_t = ['long'],
  18         )
  19
  20         self.to_hu_conv_templates = dict(
  21             ptr = '{human_type} {var_name}_hu_conv = new {human_type}(null, {var_name});',
  22             default = '{human_type} {var_name}_hu_conv = new {human_type}(null, {var_name});'
  23         )
  24
  25         self.bindings_header = """package org.ldk.impl;
  26 import org.ldk.enums.*;
  27 import java.io.File;
  28 import java.io.InputStream;
  29 import java.io.IOException;
  30 import java.nio.file.Files;
  31 import java.nio.file.Path;
  32 import java.nio.file.StandardCopyOption;
  33
  34 public class bindings {
  35         public static class VecOrSliceDef {
  36                 public long dataptr;
  37                 public long datalen;
  38                 public long stride;
  39                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
  40                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
  41                 }
  42         }
  43         static {
  44                 try {
  45                         // Try to load natively first, this works on Android and in testing.
  46                         System.loadLibrary(\"lightningjni\");
  47                 } catch (UnsatisfiedLinkError _ignored) {
  48                         // Otherwise try to load from the library jar.
  49                         File tmpdir = new File(System.getProperty("java.io.tmpdir"), "ldk-java-nativelib");
  50                         tmpdir.mkdir(); // If it fails to create, assume it was there already
  51                         tmpdir.deleteOnExit();
  52                         String libname = "liblightningjni_" + System.getProperty("os.name").replaceAll(" ", "") +
  53                                 "-" + System.getProperty("os.arch").replaceAll(" ", "") + ".nativelib";
  54                         try (InputStream is = bindings.class.getResourceAsStream("/" + libname)) {
  55                                 Path libpath = new File(tmpdir.toPath().toString(), "liblightningjni.so").toPath();
  56                                 Files.copy(is, libpath, StandardCopyOption.REPLACE_EXISTING);
  57                                 Runtime.getRuntime().load(libpath.toString());
  58                         } catch (IOException e) {
  59                                 throw new IllegalArgumentException(e);
  60                         }
  61                 }
  62                 init(java.lang.Enum.class, VecOrSliceDef.class);
  63                 init_class_cache();
  64                 if (!get_lib_version_string().equals(get_ldk_java_bindings_version()))
  65                         throw new IllegalArgumentException("Compiled LDK library and LDK class failes do not match");
  66                 // Fetching the LDK versions from C also checks that the header and binaries match
  67                 get_ldk_c_bindings_version();
  68                 get_ldk_version();
  69         }
  70         static native void init(java.lang.Class c, java.lang.Class slicedef);
  71         static native void init_class_cache();
  72         static native String get_lib_version_string();
  73
  74         public static String get_ldk_java_bindings_version() {
  75                 return "<git_version_ldk_garbagecollected>";
  76         }
  77         public static native String get_ldk_c_bindings_version();
  78         public static native String get_ldk_version();
  79
  80         public static native boolean deref_bool(long ptr);
  81         public static native long deref_long(long ptr);
  82         public static native void free_heap_ptr(long ptr);
  83         public static native byte[] read_bytes(long ptr, long len);
  84         public static native byte[] get_u8_slice_bytes(long slice_ptr);
  85         public static native long bytes_to_u8_vec(byte[] bytes);
  86         public static native long new_txpointer_copy_data(byte[] txdata);
  87         public static native void txpointer_free(long ptr);
  88         public static native byte[] txpointer_get_buffer(long ptr);
  89         public static native long vec_slice_len(long vec);
  90         public static native long new_empty_slice_vec();
  91
  92 """
  93
  94         self.bindings_footer = "}\n"
  95
  96         self.util_fn_pfx = """package org.ldk.structs;
  97 import org.ldk.impl.bindings;
  98 import java.util.Arrays;
  99 import org.ldk.enums.*;
 100
 101 public class UtilMethods {
 102 """
 103         self.util_fn_sfx = "}"
 104         self.common_base = """package org.ldk.structs;
 105 import java.util.LinkedList;
 106 class CommonBase {
 107         long ptr;
 108         LinkedList<Object> ptrs_to = new LinkedList();
 109         protected CommonBase(long ptr) { this.ptr = ptr; }
 110 }
 111 """
 112
 113         self.c_file_pfx = """#include <jni.h>
 114 // On OSX jlong (ie long long) is not equivalent to int64_t, so we override here
 115 #define int64_t jlong
 116 #include \"org_ldk_impl_bindings.h\"
 117 #include <lightning.h>
 118 #include <string.h>
 119 #include <stdatomic.h>
 120 #include <stdlib.h>
 121
 122 """
 123
 124         if self.target == Target.ANDROID:
 125             self.c_file_pfx = self.c_file_pfx + """
 126 #include <android/log.h>
 127 #define DEBUG_PRINT(...) __android_log_print(ANDROID_LOG_ERROR, "LDK", __VA_ARGS__)
 128
 129 #include <unistd.h>
 130 #include <pthread.h>
 131 static void* redirect_stderr(void* ignored) {
 132         int pipes[2];
 133         pipe(pipes);
 134         dup2(pipes[1], STDERR_FILENO);
 135         char buf[8192];
 136         memset(buf, 0, 8192);
 137         ssize_t len;
 138         while ((len = read(pipes[0], buf, 8191)) > 0) {
 139                 DEBUG_PRINT("%s\\n", buf);
 140                 memset(buf, 0, 8192);
 141         }
 142         DEBUG_PRINT("End of stderr???\\n");
 143         return 0;
 144 }
 145 void __attribute__((constructor)) spawn_stderr_redirection() {
 146         pthread_t thread;
 147         pthread_create(&thread, NULL, &redirect_stderr, NULL);
 148 }
 149 """
 150         else:
 151             self.c_file_pfx = self.c_file_pfx + "#define DEBUG_PRINT(...) fprintf(stderr, __VA_ARGS__)\n"
 152
 153         if not DEBUG or sys.platform == "darwin":
 154             self.c_file_pfx = self.c_file_pfx + """#define MALLOC(a, _) malloc(a)
 155 #define FREE(p) if ((uint64_t)(p) > 1024) { free(p); }
 156 """
 157         if not DEBUG:
 158             self.c_file_pfx += """#define DO_ASSERT(a) (void)(a)
 159 #define CHECK(a)
 160 """
 161         if DEBUG:
 162             self.c_file_pfx = self.c_file_pfx + """#include <assert.h>
 163 // Always run a, then assert it is true:
 164 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 165 // Assert a is true or do nothing
 166 #define CHECK(a) DO_ASSERT(a)
 167
 168 void __attribute__((constructor)) debug_log_version() {
 169         if (check_get_ldk_version() == NULL)
 170                 DEBUG_PRINT("LDK version did not match the header we built against\\n");
 171         if (check_get_ldk_bindings_version() == NULL)
 172                 DEBUG_PRINT("LDK C Bindings version did not match the header we built against\\n");
 173         DEBUG_PRINT("Loaded LDK-Java Bindings with LDK %s and LDK-C-Bindings %s\\n", check_get_ldk_version(), check_get_ldk_bindings_version());
 174 }
 175 """
 176
 177             if sys.platform != "darwin":
 178                 self.c_file_pfx += """
 179 // Running a leak check across all the allocations and frees of the JDK is a mess,
 180 // so instead we implement our own naive leak checker here, relying on the -wrap
 181 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 182 // and free'd in Rust or C across the generated bindings shared library.
 183 #include <threads.h>
 184 """
 185
 186                 if self.target == Target.ANDROID:
 187                     self.c_file_pfx = self.c_file_pfx + """
 188 #include <unwind.h>
 189 #include <dlfcn.h>
 190
 191 // Implement the execinfo functions using _Unwind_backtrace. This seems to miss many Rust
 192 // symbols, so we only use it on Android, where execinfo.h is unavailable.
 193
 194 struct BacktraceState {
 195         void** current;
 196         void** end;
 197 };
 198 static _Unwind_Reason_Code unwind_callback(struct _Unwind_Context* context, void* arg) {
 199         struct BacktraceState* state = (struct BacktraceState*)arg;
 200         uintptr_t pc = _Unwind_GetIP(context);
 201         if (pc) {
 202                 if (state->current == state->end) {
 203                         return _URC_END_OF_STACK;
 204                 } else {
 205                         *state->current++ = (void*)(pc);
 206                 }
 207         }
 208         return _URC_NO_REASON;
 209 }
 210
 211 int backtrace(void** buffer, int max) {
 212         struct BacktraceState state = { buffer, buffer + max };
 213         _Unwind_Backtrace(unwind_callback, &state);
 214         return state.current - buffer;
 215 }
 216
 217 void backtrace_symbols_fd(void ** buffer, int count, int _fd) {
 218         for (int idx = 0; idx < count; ++idx) {
 219                 Dl_info info;
 220                 if (dladdr(buffer[idx], &info) && info.dli_sname) {
 221                         DEBUG_PRINT("%p: %s", buffer[idx], info.dli_sname);
 222                 } else {
 223                         DEBUG_PRINT("%p: ???", buffer[idx]);
 224                 }
 225         }
 226 }
 227 """
 228                 else:
 229                     self.c_file_pfx = self.c_file_pfx + "#include <execinfo.h>\n"
 230                 self.c_file_pfx = self.c_file_pfx + """
 231 #include <unistd.h>
 232 static mtx_t allocation_mtx;
 233
 234 void __attribute__((constructor)) init_mtx() {
 235         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
 236 }
 237
 238 #define BT_MAX 128
 239 typedef struct allocation {
 240         struct allocation* next;
 241         void* ptr;
 242         const char* struct_name;
 243         void* bt[BT_MAX];
 244         int bt_len;
 245         unsigned long alloc_len;
 246 } allocation;
 247 static allocation* allocation_ll = NULL;
 248
 249 void* __real_malloc(size_t len);
 250 void* __real_calloc(size_t nmemb, size_t len);
 251 static void new_allocation(void* res, const char* struct_name, size_t len) {
 252         allocation* new_alloc = __real_malloc(sizeof(allocation));
 253         new_alloc->ptr = res;
 254         new_alloc->struct_name = struct_name;
 255         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 256         new_alloc->alloc_len = len;
 257         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 258         new_alloc->next = allocation_ll;
 259         allocation_ll = new_alloc;
 260         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 261 }
 262 static void* MALLOC(size_t len, const char* struct_name) {
 263         void* res = __real_malloc(len);
 264         new_allocation(res, struct_name, len);
 265         return res;
 266 }
 267 void __real_free(void* ptr);
 268 static void alloc_freed(void* ptr) {
 269         allocation* p = NULL;
 270         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 271         allocation* it = allocation_ll;
 272         while (it->ptr != ptr) {
 273                 p = it; it = it->next;
 274                 if (it == NULL) {
 275                         DEBUG_PRINT("Tried to free unknown pointer %p at:\\n", ptr);
 276                         void* bt[BT_MAX];
 277                         int bt_len = backtrace(bt, BT_MAX);
 278                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 279                         DEBUG_PRINT("\\n\\n");
 280                         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 281                         return; // addrsan should catch malloc-unknown and print more info than we have
 282                 }
 283         }
 284         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 285         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 286         DO_ASSERT(it->ptr == ptr);
 287         __real_free(it);
 288 }
 289 static void FREE(void* ptr) {
 290         if ((uint64_t)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 291         alloc_freed(ptr);
 292         __real_free(ptr);
 293 }
 294
 295 void* __wrap_malloc(size_t len) {
 296         void* res = __real_malloc(len);
 297         new_allocation(res, "malloc call", len);
 298         return res;
 299 }
 300 void* __wrap_calloc(size_t nmemb, size_t len) {
 301         void* res = __real_calloc(nmemb, len);
 302         new_allocation(res, "calloc call", len);
 303         return res;
 304 }
 305 void __wrap_free(void* ptr) {
 306         if (ptr == NULL) return;
 307         alloc_freed(ptr);
 308         __real_free(ptr);
 309 }
 310
 311 void* __real_realloc(void* ptr, size_t newlen);
 312 void* __wrap_realloc(void* ptr, size_t len) {
 313         if (ptr != NULL) alloc_freed(ptr);
 314         void* res = __real_realloc(ptr, len);
 315         new_allocation(res, "realloc call", len);
 316         return res;
 317 }
 318 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 319         // Rust doesn't seem to use reallocarray currently
 320         DO_ASSERT(false);
 321 }
 322
 323 void __attribute__((destructor)) check_leaks() {
 324         unsigned long alloc_count = 0;
 325         unsigned long alloc_size = 0;
 326         DEBUG_PRINT("The following LDK-allocated blocks still remain.\\n");
 327         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 328         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 329         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 330                 DEBUG_PRINT("%s %p (%lu bytes) remains:\\n", a->struct_name, a->ptr, a->alloc_len);
 331                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 332                 DEBUG_PRINT("\\n\\n");
 333                 alloc_count++;
 334                 alloc_size += a->alloc_len;
 335         }
 336         DEBUG_PRINT("%lu allocations remained for %lu bytes.\\n", alloc_count, alloc_size);
 337         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 338         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 339 }
 340 """
 341         self.c_file_pfx = self.c_file_pfx + """
 342 static jmethodID ordinal_meth = NULL;
 343 static jmethodID slicedef_meth = NULL;
 344 static jclass slicedef_cls = NULL;
 345 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 346         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 347         CHECK(ordinal_meth != NULL);
 348         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 349         CHECK(slicedef_meth != NULL);
 350         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 351         CHECK(slicedef_cls != NULL);
 352 }
 353
 354 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 355         return *((bool*)ptr);
 356 }
 357 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 358         return *((long*)ptr);
 359 }
 360 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 361         FREE((void*)ptr);
 362 }
 363 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * env, jclass _b, jlong ptr, jlong len) {
 364         jbyteArray ret_arr = (*env)->NewByteArray(env, len);
 365         (*env)->SetByteArrayRegion(env, ret_arr, 0, len, (unsigned char*)ptr);
 366         return ret_arr;
 367 }
 368 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * env, jclass _b, jlong slice_ptr) {
 369         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 370         jbyteArray ret_arr = (*env)->NewByteArray(env, slice->datalen);
 371         (*env)->SetByteArrayRegion(env, ret_arr, 0, slice->datalen, slice->data);
 372         return ret_arr;
 373 }
 374 JNIEXPORT int64_t impl_bindings_bytes_1to_1u8_1vec (JNIEnv * env, jclass _b, jbyteArray bytes) {
 375         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 376         vec->datalen = (*env)->GetArrayLength(env, bytes);
 377         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 378         (*env)->GetByteArrayRegion (env, bytes, 0, vec->datalen, vec->data);
 379         return (uint64_t)vec;
 380 }
 381 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_txpointer_1get_1buffer (JNIEnv * env, jclass _b, jlong ptr) {
 382         LDKTransaction *txdata = (LDKTransaction*)ptr;
 383         LDKu8slice slice;
 384         slice.data = txdata->data;
 385         slice.datalen = txdata->datalen;
 386         return Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes(env, _b, (uint64_t)&slice);
 387 }
 388 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 389         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 390         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 391         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 392         txdata->data_is_owned = false;
 393         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
 394         return (uint64_t)txdata;
 395 }
 396 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_txpointer_1free (JNIEnv * env, jclass _b, jlong ptr) {
 397         LDKTransaction *tx = (LDKTransaction*)ptr;
 398         tx->data_is_owned = true;
 399         Transaction_free(*tx);
 400         FREE((void*)ptr);
 401 }
 402 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 403         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 404         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
 405         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
 406         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
 407         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
 408         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 409         return (uint64_t)vec->datalen;
 410 }
 411 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * env, jclass _b) {
 412         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
 413         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
 414         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
 415         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
 416         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
 417         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
 418         vec->data = NULL;
 419         vec->datalen = 0;
 420         return (uint64_t)vec;
 421 }
 422
 423 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 424 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 425 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 426 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 427
 428 _Static_assert(sizeof(jlong) == sizeof(int64_t), "We assume that j-types are the same as C types");
 429 _Static_assert(sizeof(jbyte) == sizeof(char), "We assume that j-types are the same as C types");
 430 _Static_assert(sizeof(void*) <= 8, "Pointers must fit into 64 bits");
 431
 432 typedef jlongArray int64_tArray;
 433 typedef jbyteArray int8_tArray;
 434
 435 static inline jstring str_ref_to_java(JNIEnv *env, const char* chars, size_t len) {
 436         // Sadly we need to create a temporary because Java can't accept a char* without a 0-terminator
 437         char* conv_buf = MALLOC(len + 1, "str conv buf");
 438         memcpy(conv_buf, chars, len);
 439         conv_buf[len] = 0;
 440         jstring ret = (*env)->NewStringUTF(env, conv_buf);
 441         FREE(conv_buf);
 442         return ret;
 443 }
 444 static inline LDKStr java_to_owned_str(JNIEnv *env, jstring str) {
 445         uint64_t str_len = (*env)->GetStringUTFLength(env, str);
 446         char* newchars = MALLOC(str_len + 1, "String chars");
 447         const char* jchars = (*env)->GetStringUTFChars(env, str, NULL);
 448         memcpy(newchars, jchars, str_len);
 449         newchars[str_len] = 0;
 450         (*env)->ReleaseStringUTFChars(env, str, jchars);
 451         LDKStr res = {
 452                 .chars = newchars,
 453                 .len = str_len,
 454                 .chars_is_owned = true
 455         };
 456         return res;
 457 }
 458
 459 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1lib_1version_1string(JNIEnv *env, jclass _c) {
 460         return str_ref_to_java(env, "<git_version_ldk_garbagecollected>", strlen("<git_version_ldk_garbagecollected>"));
 461 }
 462 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1ldk_1c_1bindings_1version(JNIEnv *env, jclass _c) {
 463         return str_ref_to_java(env, check_get_ldk_bindings_version(), strlen(check_get_ldk_bindings_version()));
 464 }
 465 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1ldk_1version(JNIEnv *env, jclass _c) {
 466         return str_ref_to_java(env, check_get_ldk_version(), strlen(check_get_ldk_version()));
 467 }
 468 """
 469
 470         self.hu_struct_file_prefix = """package org.ldk.structs;
 471
 472 import org.ldk.impl.bindings;
 473 import org.ldk.enums.*;
 474 import org.ldk.util.*;
 475 import java.util.Arrays;
 476
 477 """
 478         self.c_fn_ty_pfx = "JNIEXPORT "
 479         self.c_fn_args_pfx = "JNIEnv *env, jclass clz"
 480         self.file_ext = ".java"
 481         self.ptr_c_ty = "int64_t"
 482         self.ptr_native_ty = "long"
 483         self.result_c_ty = "jclass"
 484         self.ptr_arr = "jobjectArray"
 485         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 486
 487     def construct_jenv(self):
 488         res =  "JNIEnv *env;\n"
 489         res += "jint get_jenv_res = (*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_6);\n"
 490         res += "if (get_jenv_res == JNI_EDETACHED) {\n"
 491         if self.target == Target.ANDROID:
 492             res += "\tDO_ASSERT((*j_calls->vm)->AttachCurrentThread(j_calls->vm, &env, NULL) == JNI_OK);\n"
 493         else:
 494             res += "\tDO_ASSERT((*j_calls->vm)->AttachCurrentThread(j_calls->vm, (void**)&env, NULL) == JNI_OK);\n"
 495         res += "} else {\n"
 496         res += "\tDO_ASSERT(get_jenv_res == JNI_OK);\n"
 497         res += "}\n"
 498         return res
 499     def deconstruct_jenv(self):
 500         res = "if (get_jenv_res == JNI_EDETACHED) {\n"
 501         res += "\tDO_ASSERT((*j_calls->vm)->DetachCurrentThread(j_calls->vm) == JNI_OK);\n"
 502         res += "}\n"
 503         return res
 504
 505     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 506         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 507             return "(*env)->ReleasePrimitiveArrayCritical(env, " + arr_var + ", " + arr_ptr_var + ", 0)"
 508         return None
 509     def create_native_arr_call(self, arr_len, ty_info):
 510         if ty_info.c_ty == "int8_tArray":
 511             return "(*env)->NewByteArray(env, " + arr_len + ")"
 512         elif ty_info.subty.c_ty.endswith("Array"):
 513             clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 514             self.c_array_class_caches.add(clz_var)
 515             return "(*env)->NewObjectArray(env, " + arr_len + ", " + clz_var + "_clz, NULL);\n"
 516         else:
 517             return "(*env)->New" + ty_info.java_ty.strip("[]").title() + "Array(env, " + arr_len + ")"
 518     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 519         if ty_info.c_ty == "int8_tArray":
 520             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 521         else:
 522             assert False
 523     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 524         if ty_info.c_ty == "int8_tArray":
 525             if copy:
 526                 return "(*env)->GetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", " + dest_name + ")"
 527             else:
 528                 return "(*env)->GetByteArrayElements (env, " + arr_name + ", NULL)"
 529         elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 530             return "(*env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (env, " + arr_name + ", NULL)"
 531         else:
 532             return None
 533     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 534         if self.get_native_arr_contents(arr_name, "", "", ty_info, False) is None:
 535             return "(*env)->GetObjectArrayElement(env, " + arr_name + ", " + idxc + ")"
 536         else:
 537             assert False # Only called if above is None
 538     def get_native_arr_ptr_call(self, ty_info):
 539         if ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"):
 540             return None
 541         return ("(*env)->GetPrimitiveArrayCritical(env, ", ", NULL)")
 542     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 543         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 544             return None
 545         return "(*env)->SetObjectArrayElement(env, " + arr_name + ", " + idxc + ", " + entry_access + ")"
 546     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 547         if ty_info.c_ty == "int8_tArray":
 548             return "(*env)->ReleaseByteArrayElements(env, " + arr_name + ", (int8_t*)" + dest_name + ", 0);"
 549         else:
 550             return "(*env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements(env, " + arr_name + ", " + dest_name + ", 0)"
 551
 552     def str_ref_to_native_call(self, var_name, str_len):
 553         return "str_ref_to_java(env, " + var_name + ", " + str_len + ")"
 554     def str_ref_to_c_call(self, var_name):
 555         return "java_to_owned_str(env, " + var_name + ")"
 556
 557     def c_fn_name_define_pfx(self, fn_name, has_args):
 558         if has_args:
 559             return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz, "
 560         return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz"
 561
 562     def init_str(self):
 563         res = ""
 564         for ty in sorted(self.c_array_class_caches):
 565             res = res + "static jclass " + ty + "_clz = NULL;\n"
 566         res = res + "JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass clz) {\n"
 567         for ty in sorted(self.c_array_class_caches):
 568             res = res + "\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n"
 569             res = res + "\tCHECK(" + ty + "_clz != NULL);\n"
 570             res = res + "\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n"
 571         res = res + "}\n"
 572         return res
 573
 574     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 575         out_java_enum = "package org.ldk.enums;\n\n"
 576         out_java = ""
 577         out_c = ""
 578         out_c = out_c + "static inline LDK" + struct_name + " LDK" + struct_name + "_from_java(" + self.c_fn_args_pfx + ") {\n"
 579         out_c = out_c + "\tswitch ((*env)->CallIntMethod(env, clz, ordinal_meth)) {\n"
 580
 581         if enum_doc_comment is not None:
 582             out_java_enum += "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
 583         out_java_enum += "public enum " + struct_name + " {\n"
 584         ord_v = 0
 585         for var in variants:
 586             out_java_enum = out_java_enum + "\t" + var + ",\n"
 587             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 588             ord_v = ord_v + 1
 589         out_java_enum = out_java_enum + "\t; static native void init();\n"
 590         out_java_enum = out_java_enum + "\tstatic { init(); }\n"
 591         out_java_enum = out_java_enum + "}"
 592         out_java = out_java + "\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n"
 593         out_c = out_c + "\t}\n"
 594         out_c = out_c + "\tabort();\n"
 595         out_c = out_c + "}\n"
 596
 597         out_c = out_c + "static jclass " + struct_name + "_class = NULL;\n"
 598         for var in variants:
 599             out_c = out_c + "static jfieldID " + struct_name + "_" + var + " = NULL;\n"
 600         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"
 601         out_c = out_c + "\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n"
 602         out_c = out_c + "\tCHECK(" + struct_name + "_class != NULL);\n"
 603         for var in variants:
 604             out_c = out_c + "\t" + struct_name + "_" + var + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + var + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n"
 605             out_c = out_c + "\tCHECK(" + struct_name + "_" + var + " != NULL);\n"
 606         out_c = out_c + "}\n"
 607         out_c = out_c + "static inline jclass LDK" + struct_name + "_to_java(JNIEnv *env, LDK" + struct_name + " val) {\n"
 608         out_c = out_c + "\tswitch (val) {\n"
 609         ord_v = 0
 610         for var in variants:
 611             out_c = out_c + "\t\tcase " + var + ":\n"
 612             out_c = out_c + "\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + var + ");\n"
 613             ord_v = ord_v + 1
 614         out_c = out_c + "\t\tdefault: abort();\n"
 615         out_c = out_c + "\t}\n"
 616         out_c = out_c + "}\n\n"
 617
 618         return (out_c, out_java_enum, out_java)
 619
 620     def c_unitary_enum_to_native_call(self, ty_info):
 621         return (ty_info.rust_obj + "_to_java(env, ", ")")
 622     def native_unitary_enum_to_c_call(self, ty_info):
 623         return (ty_info.rust_obj + "_from_java(env, ", ")")
 624
 625     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 626         out_c = ""
 627         for var in variants:
 628             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 629             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 630         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"
 631         for var_name in variants:
 632             out_c = out_c + "\t" + struct_name + "_" + var_name + "_class =\n"
 633             if self.target == Target.ANDROID:
 634                 out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"org/ldk/impl/bindings$" + struct_name + "$" + var_name + "\"));\n"
 635             else:
 636                 out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n"
 637             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 638             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"
 639             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 640         out_c = out_c + "}\n"
 641         return out_c
 642
 643     def c_complex_enum_pass_ty(self, struct_name):
 644         return "jobject"
 645
 646     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 647         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 648         for param in c_params:
 649             ret = ret + ", " + param
 650         return ret + ")"
 651
 652     def native_c_map_trait(self, struct_name, field_vars, flattened_field_vars, field_fns, trait_doc_comment):
 653         out_java_trait = ""
 654         out_java = ""
 655
 656         # First generate most of the Java code, note that we need information about java method argument strings for C
 657         out_java_trait = out_java_trait + self.hu_struct_file_prefix
 658         if trait_doc_comment is not None:
 659             out_java_trait += "/**\n * " + trait_doc_comment.replace("\n", "\n * ") + "\n */\n"
 660         out_java_trait += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
 661         out_java_trait = out_java_trait + "public class " + struct_name.replace("LDK","") + " extends CommonBase {\n"
 662         out_java_trait = out_java_trait + "\tfinal bindings." + struct_name + " bindings_instance;\n"
 663         out_java_trait = out_java_trait + "\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n"
 664         out_java_trait = out_java_trait + "\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg"
 665         for var in flattened_field_vars:
 666             if isinstance(var, ConvInfo):
 667                 out_java_trait = out_java_trait + ", " + var.java_hu_ty + " " + var.arg_name
 668             else:
 669                 out_java_trait = out_java_trait + ", bindings." + var[0] + " " + var[1]
 670         out_java_trait = out_java_trait + ") {\n"
 671         out_java_trait = out_java_trait + "\t\tsuper(bindings." + struct_name + "_new(arg"
 672         for var in flattened_field_vars:
 673             if isinstance(var, ConvInfo):
 674                 if var.from_hu_conv is not None:
 675                     out_java_trait = out_java_trait + ", " + var.from_hu_conv[0]
 676                 else:
 677                     out_java_trait = out_java_trait + ", " + var.arg_name
 678             else:
 679                 out_java_trait = out_java_trait + ", " + var[1]
 680         out_java_trait = out_java_trait + "));\n"
 681         out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(arg);\n"
 682         for var in flattened_field_vars:
 683             if isinstance(var, ConvInfo):
 684                 if var.from_hu_conv is not None and var.from_hu_conv[1] != "":
 685                     out_java_trait = out_java_trait + "\t\t" + var.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n"
 686             else:
 687                 out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(" + var[1] + ");\n"
 688         out_java_trait = out_java_trait + "\t\tthis.bindings_instance = arg;\n"
 689         out_java_trait = out_java_trait + "\t}\n"
 690         out_java_trait = out_java_trait + "\t@Override @SuppressWarnings(\"deprecation\")\n"
 691         out_java_trait = out_java_trait + "\tprotected void finalize() throws Throwable {\n"
 692         out_java_trait = out_java_trait + "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n"
 693         out_java_trait = out_java_trait + "\t}\n\n"
 694
 695         java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
 696         java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 697         for var in flattened_field_vars:
 698             if isinstance(var, ConvInfo):
 699                 java_trait_constr = java_trait_constr + ", " + var.java_hu_ty + " " + var.arg_name
 700             else:
 701                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 702                 # Java-implemented version, so we require users pass a Java implementation here :/
 703                 java_trait_constr = java_trait_constr + ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 704         java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 705         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
 706         out_java_trait = out_java_trait + "\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n"
 707         out_java = out_java + "\tpublic interface " + struct_name + " {\n"
 708         java_meths = []
 709         for fn_line in field_fns:
 710             java_meth_descr = "("
 711             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 712                 out_java = out_java + "\t\t " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 713                 java_trait_constr = java_trait_constr + "\t\t\t@Override public " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 714                 out_java_trait += "\t\t/**\n\t\t * " + fn_line.docs.replace("\n", "\n\t\t * ") + "\n\t\t */\n"
 715                 out_java_trait = out_java_trait + "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_line.fn_name + "("
 716
 717                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 718                     if idx >= 1:
 719                         out_java = out_java + ", "
 720                         java_trait_constr = java_trait_constr + ", "
 721                         out_java_trait = out_java_trait + ", "
 722                     out_java = out_java + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 723                     out_java_trait = out_java_trait + arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name
 724                     java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 725                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 726                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 727                 java_meths.append((fn_line.fn_name, java_meth_descr))
 728
 729                 out_java = out_java + ");\n"
 730                 out_java_trait = out_java_trait + ");\n"
 731                 java_trait_constr = java_trait_constr + ") {\n"
 732
 733                 for arg_info in fn_line.args_ty:
 734                     if arg_info.to_hu_conv is not None:
 735                         java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 736
 737                 if fn_line.ret_ty_info.java_ty != "void":
 738                     java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 739                 else:
 740                     java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.fn_name + "("
 741
 742                 for idx, arg_info in enumerate(fn_line.args_ty):
 743                     if idx != 0:
 744                         java_trait_constr = java_trait_constr + ", "
 745                     if arg_info.to_hu_conv_name is not None:
 746                         java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
 747                     else:
 748                         java_trait_constr = java_trait_constr + arg_info.arg_name
 749
 750                 java_trait_constr = java_trait_constr + ");\n"
 751                 if fn_line.ret_ty_info.java_ty != "void":
 752                     if fn_line.ret_ty_info.from_hu_conv is not None:
 753                         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"
 754                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 755                             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"
 756                         #if fn_line.ret_ty_info.rust_obj in result_types:
 757                         java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
 758                     else:
 759                         java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
 760                 java_trait_constr = java_trait_constr + "\t\t\t}\n"
 761         java_trait_constr = java_trait_constr + "\t\t}"
 762         for var in field_vars:
 763             if isinstance(var, ConvInfo):
 764                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 765             else:
 766                 java_trait_constr += ", " + var[1] + ".new_impl(" + var[1] + "_impl"
 767                 for suparg in var[2]:
 768                     if isinstance(suparg, ConvInfo):
 769                         java_trait_constr += ", " + suparg.arg_name
 770                     else:
 771                         java_trait_constr += ", " + suparg[1]
 772                 java_trait_constr += ").bindings_instance"
 773                 for suparg in var[2]:
 774                     if isinstance(suparg, ConvInfo):
 775                         java_trait_constr += ", " + suparg.arg_name
 776                     else:
 777                         java_trait_constr += ", " + suparg[1]
 778         out_java_trait = out_java_trait + "\t}\n"
 779         out_java_trait = out_java_trait + java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 780
 781         out_java = out_java + "\t}\n"
 782
 783         out_java = out_java + "\tpublic static native long " + struct_name + "_new(" + struct_name + " impl"
 784         for var in flattened_field_vars:
 785             if isinstance(var, ConvInfo):
 786                 out_java = out_java + ", " + var.java_ty + " " + var.arg_name
 787             else:
 788                 out_java = out_java + ", " + var[0] + " " + var[1]
 789         out_java = out_java + ");\n"
 790
 791         # Now that we've written out our java code (and created java_meths), generate C
 792         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 793         out_c = out_c + "\tatomic_size_t refcnt;\n"
 794         out_c = out_c + "\tJavaVM *vm;\n"
 795         out_c = out_c + "\tjweak o;\n"
 796         for var in flattened_field_vars:
 797             if isinstance(var, ConvInfo):
 798                 # We're a regular ol' field
 799                 pass
 800             else:
 801                 # We're a supertrait
 802                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 803         for fn in field_fns:
 804             if fn.fn_name != "free" and fn.fn_name != "cloned":
 805                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 806         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 807
 808         for fn_line in field_fns:
 809             if fn_line.fn_name == "free":
 810                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 811                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 812                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 813                 out_c += "\t\t" + self.construct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 814                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 815                 out_c += "\t\t" + self.deconstruct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 816                 out_c = out_c + "\t\tFREE(j_calls);\n"
 817                 out_c = out_c + "\t}\n}\n"
 818
 819         for idx, fn_line in enumerate(field_fns):
 820             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 821                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 822                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 823                 if fn_line.self_is_const:
 824                     out_c = out_c + "const void* this_arg"
 825                 else:
 826                     out_c = out_c + "void* this_arg"
 827
 828                 for idx, arg in enumerate(fn_line.args_ty):
 829                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 830
 831                 out_c = out_c + ") {\n"
 832                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 833                 out_c += "\t" + self.construct_jenv().replace("\n", "\n\t").strip() + "\n"
 834
 835                 for arg_info in fn_line.args_ty:
 836                     if arg_info.ret_conv is not None:
 837                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 838                         out_c = out_c + arg_info.arg_name
 839                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 840
 841                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 842                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 843                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 844                 elif fn_line.ret_ty_info.c_ty == "void":
 845                     out_c += "\t(*env)->Call" + fn_line.ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 846                 elif not fn_line.ret_ty_info.passed_as_ptr:
 847                     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"
 848                 else:
 849                     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"
 850
 851                 for idx, arg_info in enumerate(fn_line.args_ty):
 852                     if arg_info.ret_conv is not None:
 853                         out_c = out_c + ", " + arg_info.ret_conv_name
 854                     else:
 855                         out_c = out_c + ", " + arg_info.arg_name
 856                 out_c = out_c + ");\n"
 857
 858                 out_c += "\tif ((*env)->ExceptionCheck(env)) {\n"
 859                 out_c += "\t\t(*env)->ExceptionDescribe(env);\n"
 860                 out_c += "\t\t(*env)->FatalError(env, \"A call to " + fn_line.fn_name + " in " + struct_name + " from rust threw an exception.\");\n"
 861                 out_c += "\t}\n"
 862
 863                 if fn_line.ret_ty_info.arg_conv is not None:
 864                     out_c += "\t" + fn_line.ret_ty_info.arg_conv.replace("\n", "\n\t") + "\n"
 865                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
 866                     out_c += "\treturn " + fn_line.ret_ty_info.arg_conv_name + ";\n"
 867                 else:
 868                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
 869                     if not fn_line.ret_ty_info.passed_as_ptr and fn_line.ret_ty_info.c_ty != "void":
 870                         out_c += "\treturn ret;\n"
 871
 872                 out_c = out_c + "}\n"
 873
 874         # If we can, write out a clone function whether we need one or not, as we use them in moving to rust
 875         can_clone_with_ptr = True
 876         for var in field_vars:
 877             if isinstance(var, ConvInfo):
 878                 can_clone_with_ptr = False
 879         if can_clone_with_ptr:
 880             out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
 881             out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
 882             out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 883             for var in field_vars:
 884                 if not isinstance(var, ConvInfo):
 885                     out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 886             out_c = out_c + "}\n"
 887
 888         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 889         for var in flattened_field_vars:
 890             if isinstance(var, ConvInfo):
 891                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 892             else:
 893                 out_c = out_c + ", jobject " + var[1]
 894         out_c = out_c + ") {\n"
 895
 896         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 897         out_c = out_c + "\tCHECK(c != NULL);\n"
 898         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 899         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 900         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 901         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 902
 903         for (fn_name, java_meth_descr) in java_meths:
 904             if fn_name != "free" and fn_name != "cloned":
 905                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 906                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 907
 908         for var in flattened_field_vars:
 909             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 910                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 911         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 912         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 913         for fn_line in field_fns:
 914             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 915                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 916             elif fn_line.fn_name == "free":
 917                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 918             else:
 919                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
 920         for var in field_vars:
 921             if isinstance(var, ConvInfo):
 922                 if var.arg_conv_name is not None:
 923                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 924                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 925                 else:
 926                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 927                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 928             else:
 929                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1]
 930                 for suparg in var[2]:
 931                     if isinstance(suparg, ConvInfo):
 932                         out_c = out_c + ", " + suparg.arg_name
 933                     else:
 934                         out_c = out_c + ", " + suparg[1]
 935                 out_c += "),\n"
 936         out_c = out_c + "\t};\n"
 937         for var in flattened_field_vars:
 938             if not isinstance(var, ConvInfo):
 939                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 940         out_c = out_c + "\treturn ret;\n"
 941         out_c = out_c + "}\n"
 942
 943         out_c = out_c + self.c_fn_ty_pfx + "int64_t " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "jobject o"
 944         for var in flattened_field_vars:
 945             if isinstance(var, ConvInfo):
 946                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 947             else:
 948                 out_c = out_c + ", jobject " + var[1]
 949         out_c = out_c + ") {\n"
 950         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 951         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 952         for var in flattened_field_vars:
 953             if isinstance(var, ConvInfo):
 954                 out_c = out_c + ", " + var.arg_name
 955             else:
 956                 out_c = out_c + ", " + var[1]
 957         out_c = out_c + ");\n"
 958         out_c = out_c + "\treturn (uint64_t)res_ptr;\n"
 959         out_c = out_c + "}\n"
 960
 961         for var in flattened_field_vars:
 962             if not isinstance(var, ConvInfo):
 963                 out_java_trait += "\n\t/**\n"
 964                 out_java_trait += "\t * Gets the underlying " + var[1] + ".\n"
 965                 out_java_trait += "\t */\n"
 966                 underscore_name = ''.join('_' + c.lower() if c.isupper() else c for c in var[1]).strip('_')
 967                 out_java_trait += "\tpublic " + var[1] + " get_" + underscore_name + "() {\n"
 968                 out_java_trait += "\t\t" + var[1] + " res = new " + var[1] + "(null, bindings." + struct_name + "_get_" + var[1] + "(this.ptr));\n"
 969                 out_java_trait += "\t\tthis.ptrs_to.add(res);\n"
 970                 out_java_trait += "\t\treturn res;\n"
 971                 out_java_trait += "\t}\n"
 972                 out_java_trait += "\n"
 973
 974                 out_java += "\tpublic static native long " + struct_name + "_get_" + var[1] + "(long arg);\n"
 975
 976                 out_c += "JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_" + struct_name + "_1get_1" + var[1] + "(JNIEnv *env, jclass clz, int64_t arg) {\n"
 977                 out_c += "\t" + struct_name + " *inp = (" + struct_name + " *)(arg & ~1);\n"
 978                 out_c += "\tuint64_t res_ptr = (uint64_t)&inp->" + var[1] + ";\n"
 979                 out_c += "\tDO_ASSERT((res_ptr & 1) == 0);\n"
 980                 out_c += "\treturn (int64_t)(res_ptr | 1);\n"
 981                 out_c += "}\n"
 982
 983         return (out_java, out_java_trait, out_c)
 984
 985     def trait_struct_inc_refcnt(self, ty_info):
 986         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 987         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 988         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_cloned(&" + ty_info.var_name + "_conv);\n}"
 989         return base_conv
 990
 991     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
 992         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
 993         out_java_enum = ""
 994         out_java = ""
 995         out_c = ""
 996
 997         out_java_enum += (self.hu_struct_file_prefix)
 998         out_java_enum += "\n/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
 999         out_java_enum += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
1000         out_java_enum += ("public class " + java_hu_type + " extends CommonBase {\n")
1001         out_java_enum += ("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
1002         out_java_enum += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
1003         out_java_enum += ("\tprotected void finalize() throws Throwable {\n")
1004         out_java_enum += ("\t\tsuper.finalize();\n")
1005         out_java_enum += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK", "") + "_free(ptr); }\n")
1006         out_java_enum += ("\t}\n")
1007         out_java_enum += ("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
1008         out_java_enum += ("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
1009         java_hu_subclasses = ""
1010
1011         init_meth_jty_strs = {}
1012
1013         out_java +=  ("\tpublic static class " + struct_name + " {\n")
1014         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
1015         for var in variant_list:
1016             out_java +=  ("\t\tpublic final static class " + var.var_name + " extends " + struct_name + " {\n")
1017             java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var.var_name + " extends " + java_hu_type + " {\n"
1018             out_java_enum += ("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var.var_name + ".class) {\n")
1019             out_java_enum += ("\t\t\treturn new " + var.var_name + "(ptr, (bindings." + struct_name + "." + var.var_name + ")raw_val);\n")
1020             init_meth_jty_str = ""
1021             init_meth_params = ""
1022             init_meth_body = ""
1023             hu_conv_body = ""
1024             for idx, field_ty in enumerate(var.fields):
1025                 if idx > 0:
1026                     init_meth_params = init_meth_params + ", "
1027
1028                 if field_ty.java_hu_ty == var.var_name:
1029                     field_path = field_ty.java_fn_ty_arg.strip("L;").replace("/", ".")
1030                     out_java += "\t\t\tpublic " + field_path + " " + field_ty.arg_name + ";\n"
1031                     java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_path + " " + field_ty.arg_name + ";\n"
1032                     init_meth_params = init_meth_params + field_path + " " + field_ty.arg_name
1033                 else:
1034                     out_java += "\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n"
1035                     java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
1036                     init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
1037                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
1038                 if field_ty.to_hu_conv is not None:
1039                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1040                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1041                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1042                 else:
1043                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1044                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
1045             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
1046             out_java +=  (init_meth_body)
1047             out_java +=  ("}\n")
1048             out_java += ("\t\t}\n")
1049             out_java_enum += ("\t\t}\n")
1050             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"
1051             java_hu_subclasses = java_hu_subclasses + hu_conv_body
1052             java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
1053             init_meth_jty_strs[var.var_name] = init_meth_jty_str
1054         out_java += ("\t\tstatic native void init();\n")
1055         out_java += ("\t}\n")
1056         out_java_enum += ("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
1057         out_java_enum += (java_hu_subclasses)
1058         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
1059         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
1060
1061         out_c += (self.c_complex_enum_pfx(struct_name, [x.var_name for x in variant_list], init_meth_jty_strs))
1062
1063         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")
1064         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n")
1065         out_c += ("\tswitch(obj->tag) {\n")
1066         for var in variant_list:
1067             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
1068             c_params = []
1069             for idx, field_map in enumerate(var.fields):
1070                 if field_map.ret_conv is not None:
1071                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1072                     if var.tuple_variant:
1073                         out_c += "obj->" + camel_to_snake(var.var_name)
1074                     else:
1075                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
1076                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1077                     c_params.append(field_map.ret_conv_name)
1078                 else:
1079                     if var.tuple_variant:
1080                         c_params.append("obj->" + camel_to_snake(var.var_name))
1081                     else:
1082                         c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
1083             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
1084             out_c += ("\t\t}\n")
1085         out_c += ("\t\tdefault: abort();\n")
1086         out_c += ("\t}\n}\n")
1087         return (out_java, out_java_enum, out_c)
1088
1089     def map_opaque_struct(self, struct_name, struct_doc_comment):
1090         out_opaque_struct_human = ""
1091         out_opaque_struct_human += self.hu_struct_file_prefix
1092         out_opaque_struct_human += "\n/**\n * " + struct_doc_comment.replace("\n", "\n * ") + "\n */\n"
1093         out_opaque_struct_human += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
1094         out_opaque_struct_human += ("public class " + struct_name.replace("LDK","") + " extends CommonBase")
1095         if struct_name.startswith("LDKLocked"):
1096             out_opaque_struct_human += (" implements AutoCloseable")
1097         out_opaque_struct_human += (" {\n")
1098         out_opaque_struct_human += ("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
1099         if struct_name.startswith("LDKLocked"):
1100             out_opaque_struct_human += ("\t@Override public void close() {\n")
1101         else:
1102             out_opaque_struct_human += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
1103             out_opaque_struct_human += ("\tprotected void finalize() throws Throwable {\n")
1104             out_opaque_struct_human += ("\t\tsuper.finalize();\n")
1105         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
1106         out_opaque_struct_human += ("\t}\n\n")
1107         return out_opaque_struct_human
1108
1109
1110     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):
1111         out_java = ""
1112         out_c = ""
1113         out_java_struct = None
1114
1115         out_java += ("\tpublic static native ")
1116         out_c += (self.c_fn_ty_pfx)
1117         out_c += (return_type_info.c_ty)
1118         out_java += (return_type_info.java_ty)
1119         if return_type_info.ret_conv is not None:
1120             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1121         out_java += (" " + method_name + "(")
1122         have_args = len(argument_types) > 1 or (len(argument_types) > 0 and argument_types[0].c_ty != "void")
1123         out_c += (" " + self.c_fn_name_define_pfx(method_name, have_args))
1124
1125         for idx, arg_conv_info in enumerate(argument_types):
1126             if idx != 0:
1127                 out_java += (", ")
1128                 out_c += (", ")
1129             if arg_conv_info.c_ty != "void":
1130                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1131                 out_java += (arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
1132
1133         out_java_struct = ""
1134         if not args_known:
1135             out_java_struct += ("\t// Skipped " + method_name + "\n")
1136         else:
1137             meth_n = method_name[len(struct_meth) + 1 if len(struct_meth) != 0 else 0:].strip("_")
1138             if doc_comment is not None:
1139                 out_java_struct += "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
1140             if not takes_self:
1141                 if meth_n == "new":
1142                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " of("
1143                 elif meth_n == "default":
1144                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " with_default("
1145                 else:
1146                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " " + meth_n + "("
1147             else:
1148                 out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
1149             for idx, arg in enumerate(argument_types):
1150                 if idx != 0:
1151                     if not takes_self or idx > 1:
1152                         out_java_struct += ", "
1153                 elif takes_self:
1154                     continue
1155                 if arg.java_ty != "void":
1156                     if arg.arg_name in default_constructor_args:
1157                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1158                             if explode_idx != 0:
1159                                 out_java_struct += (", ")
1160                             out_java_struct += (
1161                                 explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
1162                     else:
1163                         out_java_struct += (arg.java_hu_ty + " " + arg.arg_name)
1164         out_java += (");\n")
1165         out_c += (") {\n")
1166         if out_java_struct is not None:
1167             out_java_struct += (") {\n")
1168         for info in argument_types:
1169             if info.arg_conv is not None:
1170                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1171         if return_type_info.ret_conv is not None:
1172             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1173         elif return_type_info.c_ty != "void":
1174             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1175         else:
1176             out_c += ("\t")
1177         if c_call_string is None:
1178             out_c += (method_name + "(")
1179         else:
1180             out_c += (c_call_string)
1181         for idx, info in enumerate(argument_types):
1182             if info.arg_conv_name is not None:
1183                 if idx != 0:
1184                     out_c += (", ")
1185                 elif c_call_string is not None:
1186                     continue
1187                 out_c += (info.arg_conv_name)
1188         out_c += (")")
1189         if return_type_info.ret_conv is not None:
1190             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1191         else:
1192             out_c += (";")
1193         for info in argument_types:
1194             if info.arg_conv_cleanup is not None:
1195                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1196         if return_type_info.ret_conv is not None:
1197             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1198         elif return_type_info.c_ty != "void":
1199             out_c += ("\n\treturn ret_val;")
1200         out_c += ("\n}\n\n")
1201
1202         if args_known:
1203             out_java_struct += ("\t\t")
1204             if return_type_info.java_ty != "void":
1205                 out_java_struct += (return_type_info.java_ty + " ret = ")
1206             out_java_struct += ("bindings." + method_name + "(")
1207             for idx, info in enumerate(argument_types):
1208                 if idx != 0:
1209                     out_java_struct += (", ")
1210                 if idx == 0 and takes_self:
1211                     out_java_struct += ("this.ptr")
1212                 elif info.arg_name in default_constructor_args:
1213                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1214                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1215                         if explode_idx != 0:
1216                             out_java_struct += (", ")
1217                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1218                         if explode_arg.from_hu_conv is not None:
1219                             out_java_struct += (
1220                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1221                         else:
1222                             out_java_struct += (expl_arg_name)
1223                     out_java_struct += (")")
1224                 elif info.from_hu_conv is not None:
1225                     out_java_struct += (info.from_hu_conv[0])
1226                 else:
1227                     out_java_struct += (info.arg_name)
1228             out_java_struct += (");\n")
1229             if return_type_info.to_hu_conv is not None:
1230                 if not takes_self:
1231                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1232                                                                                                                return_type_info.to_hu_conv_name) + "\n")
1233                 else:
1234                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1235
1236             for idx, info in enumerate(argument_types):
1237                 if idx == 0 and takes_self:
1238                     pass
1239                 elif info.arg_name in default_constructor_args:
1240                     for explode_arg in default_constructor_args[info.arg_name]:
1241                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1242                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1243                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1244                                                                                                expl_arg_name).replace(
1245                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1246                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1247                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1248                         out_java_struct += (
1249                             "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1250                     else:
1251                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1252
1253             if takes_self and not takes_self_as_ref:
1254                 out_java_struct += "\t\t" + argument_types[0].from_hu_conv[1].replace("\n", "\n\t\t").replace("this_arg", "this") + ";\n"
1255             if return_type_info.to_hu_conv_name is not None:
1256                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1257             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1258                 out_java_struct += ("\t\treturn ret;\n")
1259             out_java_struct += ("\t}\n\n")
1260
1261         return (out_java, out_c, out_java_struct)