_ 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 org.ldk.impl.version;
  28 import java.io.File;
  29 import java.io.InputStream;
  30 import java.io.IOException;
  31 import java.nio.file.Files;
  32 import java.nio.file.Path;
  33 import java.nio.file.StandardCopyOption;
  34
  35 public class bindings {
  36         public static class VecOrSliceDef {
  37                 public long dataptr;
  38                 public long datalen;
  39                 public long stride;
  40                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
  41                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
  42                 }
  43         }
  44         static {
  45                 try {
  46                         // Try to load natively first, this works on Android and in testing.
  47                         System.loadLibrary(\"lightningjni\");
  48                 } catch (UnsatisfiedLinkError system_load_err) {
  49                         // Otherwise try to load from the library jar.
  50                         File tmpdir = new File(System.getProperty("java.io.tmpdir"), "ldk-java-nativelib");
  51                         tmpdir.mkdir(); // If it fails to create, assume it was there already
  52                         tmpdir.deleteOnExit();
  53                         String libname = "liblightningjni_" + System.getProperty("os.name").replaceAll(" ", "") +
  54                                 "-" + System.getProperty("os.arch").replaceAll(" ", "") + ".nativelib";
  55                         try (InputStream is = bindings.class.getResourceAsStream("/" + libname)) {
  56                                 Path libpath = new File(tmpdir.toPath().toString(), "liblightningjni.so").toPath();
  57                                 Files.copy(is, libpath, StandardCopyOption.REPLACE_EXISTING);
  58                                 Runtime.getRuntime().load(libpath.toString());
  59                         } catch (Exception e) {
  60                                 System.err.println("Failed to load LDK native library.");
  61                                 System.err.println("System LDK native library load failed with: " + system_load_err);
  62                                 System.err.println("Resource-based LDK native library load failed with: " + e);
  63                                 throw new IllegalArgumentException(e);
  64                         }
  65                 }
  66                 init(java.lang.Enum.class, VecOrSliceDef.class);
  67                 init_class_cache();
  68                 if (!get_lib_version_string().equals(version.get_ldk_java_bindings_version()))
  69                         throw new IllegalArgumentException("Compiled LDK library and LDK class failes do not match");
  70                 // Fetching the LDK versions from C also checks that the header and binaries match
  71                 get_ldk_c_bindings_version();
  72                 get_ldk_version();
  73         }
  74         static native void init(java.lang.Class c, java.lang.Class slicedef);
  75         static native void init_class_cache();
  76         static native String get_lib_version_string();
  77
  78         public static native String get_ldk_c_bindings_version();
  79         public static native String get_ldk_version();
  80
  81         public static native boolean deref_bool(long ptr);
  82         public static native long deref_long(long ptr);
  83         public static native void free_heap_ptr(long ptr);
  84         public static native byte[] read_bytes(long ptr, long len);
  85         public static native byte[] get_u8_slice_bytes(long slice_ptr);
  86         public static native long bytes_to_u8_vec(byte[] bytes);
  87         public static native long new_txpointer_copy_data(byte[] txdata);
  88         public static native void txpointer_free(long ptr);
  89         public static native byte[] txpointer_get_buffer(long ptr);
  90         public static native long vec_slice_len(long vec);
  91         public static native long new_empty_slice_vec();
  92
  93 """
  94         self.bindings_version_file = """package org.ldk.impl;
  95
  96 public class version {
  97         public static String get_ldk_java_bindings_version() {
  98                 return "<git_version_ldk_garbagecollected>";
  99         }
 100 }"""
 101
 102         self.bindings_footer = "}\n"
 103
 104         self.util_fn_pfx = """package org.ldk.structs;
 105 import org.ldk.impl.bindings;
 106 import java.util.Arrays;
 107 import javax.annotation.Nullable;
 108 import org.ldk.enums.*;
 109
 110 public class UtilMethods {
 111 """
 112         self.util_fn_sfx = "}"
 113         self.common_base = """package org.ldk.structs;
 114 import java.util.LinkedList;
 115 class CommonBase {
 116         long ptr;
 117         LinkedList<Object> ptrs_to = new LinkedList();
 118         protected CommonBase(long ptr) { assert ptr < 0 || ptr > 4096; this.ptr = ptr; }
 119 }
 120 """
 121
 122         self.c_file_pfx = """#include <jni.h>
 123 // On OSX jlong (ie long long) is not equivalent to int64_t, so we override here
 124 #define int64_t jlong
 125 #include \"org_ldk_impl_bindings.h\"
 126 #include <lightning.h>
 127 #include <string.h>
 128 #include <stdatomic.h>
 129 #include <stdlib.h>
 130
 131 """
 132
 133         if self.target == Target.ANDROID:
 134             self.c_file_pfx = self.c_file_pfx + """
 135 #include <android/log.h>
 136 #define DEBUG_PRINT(...) __android_log_print(ANDROID_LOG_ERROR, "LDK", __VA_ARGS__)
 137
 138 #include <unistd.h>
 139 #include <pthread.h>
 140 static void* redirect_stderr(void* ignored) {
 141         int pipes[2];
 142         pipe(pipes);
 143         dup2(pipes[1], STDERR_FILENO);
 144         char buf[8192];
 145         memset(buf, 0, 8192);
 146         ssize_t len;
 147         while ((len = read(pipes[0], buf, 8191)) > 0) {
 148                 DEBUG_PRINT("%s\\n", buf);
 149                 memset(buf, 0, 8192);
 150         }
 151         DEBUG_PRINT("End of stderr???\\n");
 152         return 0;
 153 }
 154 void __attribute__((constructor)) spawn_stderr_redirection() {
 155         pthread_t thread;
 156         pthread_create(&thread, NULL, &redirect_stderr, NULL);
 157 }
 158 """
 159         else:
 160             self.c_file_pfx = self.c_file_pfx + "#define DEBUG_PRINT(...) fprintf(stderr, __VA_ARGS__)\n"
 161
 162         if not DEBUG or sys.platform == "darwin":
 163             self.c_file_pfx = self.c_file_pfx + """#define MALLOC(a, _) malloc(a)
 164 #define FREE(p) if ((uint64_t)(p) > 4096) { free(p); }
 165 #define CHECK_ACCESS(p)
 166 """
 167         if not DEBUG:
 168             self.c_file_pfx += """#define DO_ASSERT(a) (void)(a)
 169 #define CHECK(a)
 170 """
 171         if DEBUG:
 172             self.c_file_pfx = self.c_file_pfx + """#include <assert.h>
 173 // Always run a, then assert it is true:
 174 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 175 // Assert a is true or do nothing
 176 #define CHECK(a) DO_ASSERT(a)
 177
 178 void __attribute__((constructor)) debug_log_version() {
 179         if (check_get_ldk_version() == NULL)
 180                 DEBUG_PRINT("LDK version did not match the header we built against\\n");
 181         if (check_get_ldk_bindings_version() == NULL)
 182                 DEBUG_PRINT("LDK C Bindings version did not match the header we built against\\n");
 183         DEBUG_PRINT("Loaded LDK-Java Bindings with LDK %s and LDK-C-Bindings %s\\n", check_get_ldk_version(), check_get_ldk_bindings_version());
 184 }
 185 """
 186
 187             if sys.platform != "darwin":
 188                 self.c_file_pfx += """
 189 // Running a leak check across all the allocations and frees of the JDK is a mess,
 190 // so instead we implement our own naive leak checker here, relying on the -wrap
 191 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 192 // and free'd in Rust or C across the generated bindings shared library.
 193 #include <threads.h>
 194 """
 195
 196                 if self.target == Target.ANDROID:
 197                     self.c_file_pfx = self.c_file_pfx + """
 198 #include <unwind.h>
 199 #include <dlfcn.h>
 200
 201 // Implement the execinfo functions using _Unwind_backtrace. This seems to miss many Rust
 202 // symbols, so we only use it on Android, where execinfo.h is unavailable.
 203
 204 struct BacktraceState {
 205         void** current;
 206         void** end;
 207 };
 208 static _Unwind_Reason_Code unwind_callback(struct _Unwind_Context* context, void* arg) {
 209         struct BacktraceState* state = (struct BacktraceState*)arg;
 210         uintptr_t pc = _Unwind_GetIP(context);
 211         if (pc) {
 212                 if (state->current == state->end) {
 213                         return _URC_END_OF_STACK;
 214                 } else {
 215                         *state->current++ = (void*)(pc);
 216                 }
 217         }
 218         return _URC_NO_REASON;
 219 }
 220
 221 int backtrace(void** buffer, int max) {
 222         struct BacktraceState state = { buffer, buffer + max };
 223         _Unwind_Backtrace(unwind_callback, &state);
 224         return state.current - buffer;
 225 }
 226
 227 void backtrace_symbols_fd(void ** buffer, int count, int _fd) {
 228         for (int idx = 0; idx < count; ++idx) {
 229                 Dl_info info;
 230                 if (dladdr(buffer[idx], &info) && info.dli_sname) {
 231                         DEBUG_PRINT("%p: %s", buffer[idx], info.dli_sname);
 232                 } else {
 233                         DEBUG_PRINT("%p: ???", buffer[idx]);
 234                 }
 235         }
 236 }
 237 """
 238                 else:
 239                     self.c_file_pfx = self.c_file_pfx + "#include <execinfo.h>\n"
 240                 self.c_file_pfx = self.c_file_pfx + """
 241 #include <unistd.h>
 242 #include <pthread.h>
 243 static pthread_mutex_t allocation_mtx;
 244
 245 void __attribute__((constructor)) init_mtx() {
 246         DO_ASSERT(!pthread_mutex_init(&allocation_mtx, NULL));
 247 }
 248
 249 #define BT_MAX 128
 250 typedef struct allocation {
 251         struct allocation* next;
 252         void* ptr;
 253         const char* struct_name;
 254         void* bt[BT_MAX];
 255         int bt_len;
 256         unsigned long alloc_len;
 257 } allocation;
 258 static allocation* allocation_ll = NULL;
 259
 260 void* __real_malloc(size_t len);
 261 void* __real_calloc(size_t nmemb, size_t len);
 262 static void new_allocation(void* res, const char* struct_name, size_t len) {
 263         allocation* new_alloc = __real_malloc(sizeof(allocation));
 264         new_alloc->ptr = res;
 265         new_alloc->struct_name = struct_name;
 266         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 267         new_alloc->alloc_len = len;
 268         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 269         new_alloc->next = allocation_ll;
 270         allocation_ll = new_alloc;
 271         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 272 }
 273 static void* MALLOC(size_t len, const char* struct_name) {
 274         void* res = __real_malloc(len);
 275         new_allocation(res, struct_name, len);
 276         return res;
 277 }
 278 void __real_free(void* ptr);
 279 static void alloc_freed(void* ptr) {
 280         allocation* p = NULL;
 281         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 282         allocation* it = allocation_ll;
 283         while (it->ptr != ptr) {
 284                 p = it; it = it->next;
 285                 if (it == NULL) {
 286                         DEBUG_PRINT("ERROR: Tried to free unknown pointer %p at:\\n", ptr);
 287                         void* bt[BT_MAX];
 288                         int bt_len = backtrace(bt, BT_MAX);
 289                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 290                         DEBUG_PRINT("\\n\\n");
 291                         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 292                         return; // addrsan should catch malloc-unknown and print more info than we have
 293                 }
 294         }
 295         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 296         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 297         DO_ASSERT(it->ptr == ptr);
 298         __real_free(it);
 299 }
 300 static void FREE(void* ptr) {
 301         if ((uint64_t)ptr <= 4096) return; // Rust loves to create pointers to the NULL page for dummys
 302         alloc_freed(ptr);
 303         __real_free(ptr);
 304 }
 305
 306 void* __wrap_malloc(size_t len) {
 307         void* res = __real_malloc(len);
 308         new_allocation(res, "malloc call", len);
 309         return res;
 310 }
 311 void* __wrap_calloc(size_t nmemb, size_t len) {
 312         void* res = __real_calloc(nmemb, len);
 313         new_allocation(res, "calloc call", len);
 314         return res;
 315 }
 316 void __wrap_free(void* ptr) {
 317         if (ptr == NULL) return;
 318         alloc_freed(ptr);
 319         __real_free(ptr);
 320 }
 321
 322 static void CHECK_ACCESS(void* ptr) {
 323         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 324         allocation* it = allocation_ll;
 325         while (it->ptr != ptr) {
 326                 it = it->next;
 327                 if (it == NULL) {
 328                         DEBUG_PRINT("ERROR: Tried to access unknown pointer %p at:\\n", ptr);
 329                         void* bt[BT_MAX];
 330                         int bt_len = backtrace(bt, BT_MAX);
 331                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 332                         DEBUG_PRINT("\\n\\n");
 333                         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 334                         return; // addrsan should catch and print more info than we have
 335                 }
 336         }
 337         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 338 }
 339
 340 void* __real_realloc(void* ptr, size_t newlen);
 341 void* __wrap_realloc(void* ptr, size_t len) {
 342         if (ptr != NULL) alloc_freed(ptr);
 343         void* res = __real_realloc(ptr, len);
 344         new_allocation(res, "realloc call", len);
 345         return res;
 346 }
 347 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 348         // Rust doesn't seem to use reallocarray currently
 349         DO_ASSERT(false);
 350 }
 351
 352 void __attribute__((destructor)) check_leaks() {
 353         unsigned long alloc_count = 0;
 354         unsigned long alloc_size = 0;
 355         DEBUG_PRINT("The following LDK-allocated blocks still remain.\\n");
 356         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 357         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 358         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 359                 DEBUG_PRINT("%s %p (%lu bytes) remains:\\n", a->struct_name, a->ptr, a->alloc_len);
 360                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 361                 DEBUG_PRINT("\\n\\n");
 362                 alloc_count++;
 363                 alloc_size += a->alloc_len;
 364         }
 365         DEBUG_PRINT("%lu allocations remained for %lu bytes.\\n", alloc_count, alloc_size);
 366         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 367         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 368 }
 369 """
 370         self.c_file_pfx = self.c_file_pfx + """
 371 static jmethodID ordinal_meth = NULL;
 372 static jmethodID slicedef_meth = NULL;
 373 static jclass slicedef_cls = NULL;
 374 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 375         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 376         CHECK(ordinal_meth != NULL);
 377         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 378         CHECK(slicedef_meth != NULL);
 379         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 380         CHECK(slicedef_cls != NULL);
 381 }
 382
 383 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 384         return *((bool*)ptr);
 385 }
 386 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 387         return *((long*)ptr);
 388 }
 389 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 390         FREE((void*)ptr);
 391 }
 392 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * env, jclass _b, jlong ptr, jlong len) {
 393         jbyteArray ret_arr = (*env)->NewByteArray(env, len);
 394         (*env)->SetByteArrayRegion(env, ret_arr, 0, len, (unsigned char*)ptr);
 395         return ret_arr;
 396 }
 397 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * env, jclass _b, jlong slice_ptr) {
 398         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 399         jbyteArray ret_arr = (*env)->NewByteArray(env, slice->datalen);
 400         (*env)->SetByteArrayRegion(env, ret_arr, 0, slice->datalen, slice->data);
 401         return ret_arr;
 402 }
 403 JNIEXPORT int64_t impl_bindings_bytes_1to_1u8_1vec (JNIEnv * env, jclass _b, jbyteArray bytes) {
 404         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 405         vec->datalen = (*env)->GetArrayLength(env, bytes);
 406         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 407         (*env)->GetByteArrayRegion (env, bytes, 0, vec->datalen, vec->data);
 408         return (uint64_t)vec;
 409 }
 410 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_txpointer_1get_1buffer (JNIEnv * env, jclass _b, jlong ptr) {
 411         LDKTransaction *txdata = (LDKTransaction*)ptr;
 412         LDKu8slice slice;
 413         slice.data = txdata->data;
 414         slice.datalen = txdata->datalen;
 415         return Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes(env, _b, (uint64_t)&slice);
 416 }
 417 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 418         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 419         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 420         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 421         txdata->data_is_owned = false;
 422         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
 423         return (uint64_t)txdata;
 424 }
 425 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_txpointer_1free (JNIEnv * env, jclass _b, jlong ptr) {
 426         LDKTransaction *tx = (LDKTransaction*)ptr;
 427         tx->data_is_owned = true;
 428         Transaction_free(*tx);
 429         FREE((void*)ptr);
 430 }
 431 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 432         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 433         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
 434         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
 435         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
 436         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
 437         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 438         return (uint64_t)vec->datalen;
 439 }
 440 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * env, jclass _b) {
 441         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
 442         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
 443         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
 444         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
 445         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
 446         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
 447         vec->data = NULL;
 448         vec->datalen = 0;
 449         return (uint64_t)vec;
 450 }
 451
 452 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 453 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 454 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 455 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 456
 457 _Static_assert(sizeof(jlong) == sizeof(int64_t), "We assume that j-types are the same as C types");
 458 _Static_assert(sizeof(jbyte) == sizeof(char), "We assume that j-types are the same as C types");
 459 _Static_assert(sizeof(void*) <= 8, "Pointers must fit into 64 bits");
 460
 461 typedef jlongArray int64_tArray;
 462 typedef jbyteArray int8_tArray;
 463
 464 static inline jstring str_ref_to_java(JNIEnv *env, const char* chars, size_t len) {
 465         // Sadly we need to create a temporary because Java can't accept a char* without a 0-terminator
 466         char* conv_buf = MALLOC(len + 1, "str conv buf");
 467         memcpy(conv_buf, chars, len);
 468         conv_buf[len] = 0;
 469         jstring ret = (*env)->NewStringUTF(env, conv_buf);
 470         FREE(conv_buf);
 471         return ret;
 472 }
 473 static inline LDKStr java_to_owned_str(JNIEnv *env, jstring str) {
 474         uint64_t str_len = (*env)->GetStringUTFLength(env, str);
 475         char* newchars = MALLOC(str_len + 1, "String chars");
 476         const char* jchars = (*env)->GetStringUTFChars(env, str, NULL);
 477         memcpy(newchars, jchars, str_len);
 478         newchars[str_len] = 0;
 479         (*env)->ReleaseStringUTFChars(env, str, jchars);
 480         LDKStr res = {
 481                 .chars = newchars,
 482                 .len = str_len,
 483                 .chars_is_owned = true
 484         };
 485         return res;
 486 }
 487
 488 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1ldk_1c_1bindings_1version(JNIEnv *env, jclass _c) {
 489         return str_ref_to_java(env, check_get_ldk_bindings_version(), strlen(check_get_ldk_bindings_version()));
 490 }
 491 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1ldk_1version(JNIEnv *env, jclass _c) {
 492         return str_ref_to_java(env, check_get_ldk_version(), strlen(check_get_ldk_version()));
 493 }
 494 #include "version.c"
 495 """
 496         self.c_version_file = """JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1lib_1version_1string(JNIEnv *env, jclass _c) {
 497         return str_ref_to_java(env, "<git_version_ldk_garbagecollected>", strlen("<git_version_ldk_garbagecollected>"));
 498 }"""
 499
 500         self.hu_struct_file_prefix = """package org.ldk.structs;
 501
 502 import org.ldk.impl.bindings;
 503 import org.ldk.enums.*;
 504 import org.ldk.util.*;
 505 import java.util.Arrays;
 506 import javax.annotation.Nullable;
 507
 508 """
 509         self.c_fn_ty_pfx = "JNIEXPORT "
 510         self.c_fn_args_pfx = "JNIEnv *env, jclass clz"
 511         self.file_ext = ".java"
 512         self.ptr_c_ty = "int64_t"
 513         self.ptr_native_ty = "long"
 514         self.result_c_ty = "jclass"
 515         self.ptr_arr = "jobjectArray"
 516         self.is_arr_some_check = ("", " != NULL")
 517         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 518
 519     def construct_jenv(self):
 520         res =  "JNIEnv *env;\n"
 521         res += "jint get_jenv_res = (*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_6);\n"
 522         res += "if (get_jenv_res == JNI_EDETACHED) {\n"
 523         if self.target == Target.ANDROID:
 524             res += "\tDO_ASSERT((*j_calls->vm)->AttachCurrentThread(j_calls->vm, &env, NULL) == JNI_OK);\n"
 525         else:
 526             res += "\tDO_ASSERT((*j_calls->vm)->AttachCurrentThread(j_calls->vm, (void**)&env, NULL) == JNI_OK);\n"
 527         res += "} else {\n"
 528         res += "\tDO_ASSERT(get_jenv_res == JNI_OK);\n"
 529         res += "}\n"
 530         return res
 531     def deconstruct_jenv(self):
 532         res = "if (get_jenv_res == JNI_EDETACHED) {\n"
 533         res += "\tDO_ASSERT((*j_calls->vm)->DetachCurrentThread(j_calls->vm) == JNI_OK);\n"
 534         res += "}\n"
 535         return res
 536
 537     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 538         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 539             return "(*env)->ReleasePrimitiveArrayCritical(env, " + arr_var + ", " + arr_ptr_var + ", 0)"
 540         return None
 541     def create_native_arr_call(self, arr_len, ty_info):
 542         if ty_info.c_ty == "int8_tArray":
 543             return "(*env)->NewByteArray(env, " + arr_len + ")"
 544         elif ty_info.subty.c_ty.endswith("Array"):
 545             clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 546             self.c_array_class_caches.add(clz_var)
 547             return "(*env)->NewObjectArray(env, " + arr_len + ", " + clz_var + "_clz, NULL);\n"
 548         else:
 549             return "(*env)->New" + ty_info.java_ty.strip("[]").title() + "Array(env, " + arr_len + ")"
 550     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 551         if ty_info.c_ty == "int8_tArray":
 552             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 553         else:
 554             assert False
 555     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 556         if ty_info.c_ty == "int8_tArray":
 557             if copy:
 558                 return "(*env)->GetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", " + dest_name + ")"
 559             else:
 560                 return "(*env)->GetByteArrayElements (env, " + arr_name + ", NULL)"
 561         elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 562             return "(*env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (env, " + arr_name + ", NULL)"
 563         else:
 564             return None
 565     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 566         if self.get_native_arr_contents(arr_name, "", "", ty_info, False) is None:
 567             return "(*env)->GetObjectArrayElement(env, " + arr_name + ", " + idxc + ")"
 568         else:
 569             assert False # Only called if above is None
 570     def get_native_arr_ptr_call(self, ty_info):
 571         if ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"):
 572             return None
 573         return ("(*env)->GetPrimitiveArrayCritical(env, ", ", NULL)")
 574     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 575         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 576             return None
 577         return "(*env)->SetObjectArrayElement(env, " + arr_name + ", " + idxc + ", " + entry_access + ")"
 578     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 579         if ty_info.c_ty == "int8_tArray":
 580             return "(*env)->ReleaseByteArrayElements(env, " + arr_name + ", (int8_t*)" + dest_name + ", 0);"
 581         else:
 582             return "(*env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements(env, " + arr_name + ", " + dest_name + ", 0)"
 583
 584     def str_ref_to_native_call(self, var_name, str_len):
 585         return "str_ref_to_java(env, " + var_name + ", " + str_len + ")"
 586     def str_ref_to_c_call(self, var_name):
 587         return "java_to_owned_str(env, " + var_name + ")"
 588
 589     def c_fn_name_define_pfx(self, fn_name, has_args):
 590         if has_args:
 591             return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz, "
 592         return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz"
 593
 594     def init_str(self):
 595         res = ""
 596         for ty in sorted(self.c_array_class_caches):
 597             res = res + "static jclass " + ty + "_clz = NULL;\n"
 598         res = res + "JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass clz) {\n"
 599         for ty in sorted(self.c_array_class_caches):
 600             res = res + "\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n"
 601             res = res + "\tCHECK(" + ty + "_clz != NULL);\n"
 602             res = res + "\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n"
 603         res = res + "}\n"
 604         return res
 605
 606     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 607         out_java_enum = "package org.ldk.enums;\n\n"
 608         out_java = ""
 609         out_c = ""
 610         out_c = out_c + "static inline LDK" + struct_name + " LDK" + struct_name + "_from_java(" + self.c_fn_args_pfx + ") {\n"
 611         out_c = out_c + "\tswitch ((*env)->CallIntMethod(env, clz, ordinal_meth)) {\n"
 612
 613         if enum_doc_comment is not None:
 614             out_java_enum += "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
 615         out_java_enum += "public enum " + struct_name + " {\n"
 616         ord_v = 0
 617         for var in variants:
 618             out_java_enum = out_java_enum + "\t" + var + ",\n"
 619             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 620             ord_v = ord_v + 1
 621         out_java_enum = out_java_enum + "\t; static native void init();\n"
 622         out_java_enum = out_java_enum + "\tstatic { init(); }\n"
 623         out_java_enum = out_java_enum + "}"
 624         out_java = out_java + "\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n"
 625         out_c = out_c + "\t}\n"
 626         out_c = out_c + "\tabort();\n"
 627         out_c = out_c + "}\n"
 628
 629         out_c = out_c + "static jclass " + struct_name + "_class = NULL;\n"
 630         for var in variants:
 631             out_c = out_c + "static jfieldID " + struct_name + "_" + var + " = NULL;\n"
 632         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"
 633         out_c = out_c + "\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n"
 634         out_c = out_c + "\tCHECK(" + struct_name + "_class != NULL);\n"
 635         for var in variants:
 636             out_c = out_c + "\t" + struct_name + "_" + var + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + var + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n"
 637             out_c = out_c + "\tCHECK(" + struct_name + "_" + var + " != NULL);\n"
 638         out_c = out_c + "}\n"
 639         out_c = out_c + "static inline jclass LDK" + struct_name + "_to_java(JNIEnv *env, LDK" + struct_name + " val) {\n"
 640         out_c = out_c + "\tswitch (val) {\n"
 641         ord_v = 0
 642         for var in variants:
 643             out_c = out_c + "\t\tcase " + var + ":\n"
 644             out_c = out_c + "\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + var + ");\n"
 645             ord_v = ord_v + 1
 646         out_c = out_c + "\t\tdefault: abort();\n"
 647         out_c = out_c + "\t}\n"
 648         out_c = out_c + "}\n\n"
 649
 650         return (out_c, out_java_enum, out_java)
 651
 652     def c_unitary_enum_to_native_call(self, ty_info):
 653         return (ty_info.rust_obj + "_to_java(env, ", ")")
 654     def native_unitary_enum_to_c_call(self, ty_info):
 655         return (ty_info.rust_obj + "_from_java(env, ", ")")
 656
 657     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 658         out_c = ""
 659         for var in variants:
 660             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 661             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 662         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"
 663         for var_name in variants:
 664             out_c = out_c + "\t" + struct_name + "_" + var_name + "_class =\n"
 665             if self.target == Target.ANDROID:
 666                 out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"org/ldk/impl/bindings$" + struct_name + "$" + var_name + "\"));\n"
 667             else:
 668                 out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n"
 669             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 670             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"
 671             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 672         out_c = out_c + "}\n"
 673         return out_c
 674
 675     def c_complex_enum_pass_ty(self, struct_name):
 676         return "jobject"
 677
 678     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 679         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 680         for param in c_params:
 681             ret = ret + ", " + param
 682         return ret + ")"
 683
 684     def native_c_map_trait(self, struct_name, field_vars, flattened_field_vars, field_fns, trait_doc_comment):
 685         out_java_trait = ""
 686         out_java = ""
 687
 688         # First generate most of the Java code, note that we need information about java method argument strings for C
 689         out_java_trait = out_java_trait + self.hu_struct_file_prefix
 690         if trait_doc_comment is not None:
 691             out_java_trait += "/**\n * " + trait_doc_comment.replace("\n", "\n * ") + "\n */\n"
 692         out_java_trait += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
 693         out_java_trait = out_java_trait + "public class " + struct_name.replace("LDK","") + " extends CommonBase {\n"
 694         out_java_trait = out_java_trait + "\tfinal bindings." + struct_name + " bindings_instance;\n"
 695         out_java_trait = out_java_trait + "\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n"
 696         out_java_trait = out_java_trait + "\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg"
 697         for var in flattened_field_vars:
 698             if isinstance(var, ConvInfo):
 699                 out_java_trait = out_java_trait + ", " + var.java_hu_ty + " " + var.arg_name
 700             else:
 701                 out_java_trait = out_java_trait + ", bindings." + var[0] + " " + var[1]
 702         out_java_trait = out_java_trait + ") {\n"
 703         out_java_trait = out_java_trait + "\t\tsuper(bindings." + struct_name + "_new(arg"
 704         for var in flattened_field_vars:
 705             if isinstance(var, ConvInfo):
 706                 if var.from_hu_conv is not None:
 707                     out_java_trait = out_java_trait + ", " + var.from_hu_conv[0]
 708                 else:
 709                     out_java_trait = out_java_trait + ", " + var.arg_name
 710             else:
 711                 out_java_trait = out_java_trait + ", " + var[1]
 712         out_java_trait = out_java_trait + "));\n"
 713         out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(arg);\n"
 714         for var in flattened_field_vars:
 715             if isinstance(var, ConvInfo):
 716                 if var.from_hu_conv is not None and var.from_hu_conv[1] != "":
 717                     out_java_trait = out_java_trait + "\t\t" + var.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n"
 718             else:
 719                 out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(" + var[1] + ");\n"
 720         out_java_trait = out_java_trait + "\t\tthis.bindings_instance = arg;\n"
 721         out_java_trait = out_java_trait + "\t}\n"
 722         out_java_trait = out_java_trait + "\t@Override @SuppressWarnings(\"deprecation\")\n"
 723         out_java_trait = out_java_trait + "\tprotected void finalize() throws Throwable {\n"
 724         out_java_trait = out_java_trait + "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n"
 725         out_java_trait = out_java_trait + "\t}\n\n"
 726
 727         java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
 728         java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 729         for var in flattened_field_vars:
 730             if isinstance(var, ConvInfo):
 731                 java_trait_constr = java_trait_constr + ", " + var.java_hu_ty + " " + var.arg_name
 732             else:
 733                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 734                 # Java-implemented version, so we require users pass a Java implementation here :/
 735                 java_trait_constr = java_trait_constr + ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 736         java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 737         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
 738         out_java_trait = out_java_trait + "\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n"
 739         out_java = out_java + "\tpublic interface " + struct_name + " {\n"
 740         java_meths = []
 741         for fn_line in field_fns:
 742             java_meth_descr = "("
 743             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 744                 out_java = out_java + "\t\t " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 745                 java_trait_constr = java_trait_constr + "\t\t\t@Override public " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 746                 out_java_trait += "\t\t/**\n\t\t * " + fn_line.docs.replace("\n", "\n\t\t * ") + "\n\t\t */\n"
 747                 out_java_trait = out_java_trait + "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_line.fn_name + "("
 748
 749                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 750                     if idx >= 1:
 751                         out_java = out_java + ", "
 752                         java_trait_constr = java_trait_constr + ", "
 753                         out_java_trait = out_java_trait + ", "
 754                     out_java = out_java + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 755                     out_java_trait = out_java_trait + arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name
 756                     java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 757                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 758                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 759                 java_meths.append((fn_line.fn_name, java_meth_descr))
 760
 761                 out_java = out_java + ");\n"
 762                 out_java_trait = out_java_trait + ");\n"
 763                 java_trait_constr = java_trait_constr + ") {\n"
 764
 765                 for arg_info in fn_line.args_ty:
 766                     if arg_info.to_hu_conv is not None:
 767                         java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 768
 769                 if fn_line.ret_ty_info.java_ty != "void":
 770                     java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 771                 else:
 772                     java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.fn_name + "("
 773
 774                 for idx, arg_info in enumerate(fn_line.args_ty):
 775                     if idx != 0:
 776                         java_trait_constr = java_trait_constr + ", "
 777                     if arg_info.to_hu_conv_name is not None:
 778                         java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
 779                     else:
 780                         java_trait_constr = java_trait_constr + arg_info.arg_name
 781
 782                 java_trait_constr = java_trait_constr + ");\n"
 783                 if fn_line.ret_ty_info.java_ty != "void":
 784                     if fn_line.ret_ty_info.from_hu_conv is not None:
 785                         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"
 786                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 787                             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"
 788                         #if fn_line.ret_ty_info.rust_obj in result_types:
 789                         java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
 790                     else:
 791                         java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
 792                 java_trait_constr = java_trait_constr + "\t\t\t}\n"
 793         java_trait_constr = java_trait_constr + "\t\t}"
 794         for var in field_vars:
 795             if isinstance(var, ConvInfo):
 796                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 797             else:
 798                 java_trait_constr += ", " + var[1] + ".new_impl(" + var[1] + "_impl"
 799                 for suparg in var[2]:
 800                     if isinstance(suparg, ConvInfo):
 801                         java_trait_constr += ", " + suparg.arg_name
 802                     else:
 803                         java_trait_constr += ", " + suparg[1]
 804                 java_trait_constr += ").bindings_instance"
 805                 for suparg in var[2]:
 806                     if isinstance(suparg, ConvInfo):
 807                         java_trait_constr += ", " + suparg.arg_name
 808                     else:
 809                         java_trait_constr += ", " + suparg[1]
 810         out_java_trait = out_java_trait + "\t}\n"
 811         out_java_trait = out_java_trait + java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 812
 813         out_java = out_java + "\t}\n"
 814
 815         out_java = out_java + "\tpublic static native long " + struct_name + "_new(" + struct_name + " impl"
 816         for var in flattened_field_vars:
 817             if isinstance(var, ConvInfo):
 818                 out_java = out_java + ", " + var.java_ty + " " + var.arg_name
 819             else:
 820                 out_java = out_java + ", " + var[0] + " " + var[1]
 821         out_java = out_java + ");\n"
 822
 823         # Now that we've written out our java code (and created java_meths), generate C
 824         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 825         out_c = out_c + "\tatomic_size_t refcnt;\n"
 826         out_c = out_c + "\tJavaVM *vm;\n"
 827         out_c = out_c + "\tjweak o;\n"
 828         for var in flattened_field_vars:
 829             if isinstance(var, ConvInfo):
 830                 # We're a regular ol' field
 831                 pass
 832             else:
 833                 # We're a supertrait
 834                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 835         for fn in field_fns:
 836             if fn.fn_name != "free" and fn.fn_name != "cloned":
 837                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 838         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 839
 840         for fn_line in field_fns:
 841             if fn_line.fn_name == "free":
 842                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 843                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 844                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 845                 out_c += "\t\t" + self.construct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 846                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 847                 out_c += "\t\t" + self.deconstruct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 848                 out_c = out_c + "\t\tFREE(j_calls);\n"
 849                 out_c = out_c + "\t}\n}\n"
 850
 851         for idx, fn_line in enumerate(field_fns):
 852             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 853                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 854                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 855                 if fn_line.self_is_const:
 856                     out_c = out_c + "const void* this_arg"
 857                 else:
 858                     out_c = out_c + "void* this_arg"
 859
 860                 for idx, arg in enumerate(fn_line.args_ty):
 861                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 862
 863                 out_c = out_c + ") {\n"
 864                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 865                 out_c += "\t" + self.construct_jenv().replace("\n", "\n\t").strip() + "\n"
 866
 867                 for arg_info in fn_line.args_ty:
 868                     if arg_info.ret_conv is not None:
 869                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 870                         out_c = out_c + arg_info.arg_name
 871                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 872
 873                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 874                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 875                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 876                 elif fn_line.ret_ty_info.c_ty == "void":
 877                     out_c += "\t(*env)->Call" + fn_line.ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 878                 elif fn_line.ret_ty_info.java_ty == "String":
 879                     # Manually write out String methods as they're just an Object
 880                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 881                 elif not fn_line.ret_ty_info.passed_as_ptr:
 882                     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"
 883                 else:
 884                     out_c = out_c + "\tuint64_t ret = (*env)->CallLongMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 885
 886                 for idx, arg_info in enumerate(fn_line.args_ty):
 887                     if arg_info.ret_conv is not None:
 888                         out_c = out_c + ", " + arg_info.ret_conv_name
 889                     else:
 890                         out_c = out_c + ", " + arg_info.arg_name
 891                 out_c = out_c + ");\n"
 892
 893                 out_c += "\tif ((*env)->ExceptionCheck(env)) {\n"
 894                 out_c += "\t\t(*env)->ExceptionDescribe(env);\n"
 895                 out_c += "\t\t(*env)->FatalError(env, \"A call to " + fn_line.fn_name + " in " + struct_name + " from rust threw an exception.\");\n"
 896                 out_c += "\t}\n"
 897
 898                 if fn_line.ret_ty_info.arg_conv is not None:
 899                     out_c += "\t" + fn_line.ret_ty_info.arg_conv.replace("\n", "\n\t") + "\n"
 900                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
 901                     out_c += "\treturn " + fn_line.ret_ty_info.arg_conv_name + ";\n"
 902                 else:
 903                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
 904                     if not fn_line.ret_ty_info.passed_as_ptr and fn_line.ret_ty_info.c_ty != "void":
 905                         out_c += "\treturn ret;\n"
 906
 907                 out_c = out_c + "}\n"
 908
 909         # If we can, write out a clone function whether we need one or not, as we use them in moving to rust
 910         can_clone_with_ptr = True
 911         for var in field_vars:
 912             if isinstance(var, ConvInfo):
 913                 can_clone_with_ptr = False
 914         if can_clone_with_ptr:
 915             out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
 916             out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
 917             out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 918             for var in field_vars:
 919                 if not isinstance(var, ConvInfo):
 920                     out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 921             out_c = out_c + "}\n"
 922
 923         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 924         for var in flattened_field_vars:
 925             if isinstance(var, ConvInfo):
 926                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 927             else:
 928                 out_c = out_c + ", jobject " + var[1]
 929         out_c = out_c + ") {\n"
 930
 931         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 932         out_c = out_c + "\tCHECK(c != NULL);\n"
 933         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 934         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 935         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 936         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 937
 938         for (fn_name, java_meth_descr) in java_meths:
 939             if fn_name != "free" and fn_name != "cloned":
 940                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 941                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 942
 943         for var in flattened_field_vars:
 944             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 945                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 946         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 947         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 948         for fn_line in field_fns:
 949             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 950                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 951             elif fn_line.fn_name == "free":
 952                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 953             else:
 954                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
 955         for var in field_vars:
 956             if isinstance(var, ConvInfo):
 957                 if var.arg_conv_name is not None:
 958                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 959                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 960                 else:
 961                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 962                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 963             else:
 964                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1]
 965                 for suparg in var[2]:
 966                     if isinstance(suparg, ConvInfo):
 967                         out_c = out_c + ", " + suparg.arg_name
 968                     else:
 969                         out_c = out_c + ", " + suparg[1]
 970                 out_c += "),\n"
 971         out_c = out_c + "\t};\n"
 972         for var in flattened_field_vars:
 973             if not isinstance(var, ConvInfo):
 974                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 975         out_c = out_c + "\treturn ret;\n"
 976         out_c = out_c + "}\n"
 977
 978         out_c = out_c + self.c_fn_ty_pfx + "int64_t " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "jobject o"
 979         for var in flattened_field_vars:
 980             if isinstance(var, ConvInfo):
 981                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 982             else:
 983                 out_c = out_c + ", jobject " + var[1]
 984         out_c = out_c + ") {\n"
 985         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 986         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 987         for var in flattened_field_vars:
 988             if isinstance(var, ConvInfo):
 989                 out_c = out_c + ", " + var.arg_name
 990             else:
 991                 out_c = out_c + ", " + var[1]
 992         out_c = out_c + ");\n"
 993         out_c = out_c + "\treturn (uint64_t)res_ptr;\n"
 994         out_c = out_c + "}\n"
 995
 996         for var in flattened_field_vars:
 997             if not isinstance(var, ConvInfo):
 998                 out_java_trait += "\n\t/**\n"
 999                 out_java_trait += "\t * Gets the underlying " + var[1] + ".\n"
1000                 out_java_trait += "\t */\n"
1001                 underscore_name = ''.join('_' + c.lower() if c.isupper() else c for c in var[1]).strip('_')
1002                 out_java_trait += "\tpublic " + var[1] + " get_" + underscore_name + "() {\n"
1003                 out_java_trait += "\t\t" + var[1] + " res = new " + var[1] + "(null, bindings." + struct_name + "_get_" + var[1] + "(this.ptr));\n"
1004                 out_java_trait += "\t\tthis.ptrs_to.add(res);\n"
1005                 out_java_trait += "\t\treturn res;\n"
1006                 out_java_trait += "\t}\n"
1007                 out_java_trait += "\n"
1008
1009                 out_java += "\tpublic static native long " + struct_name + "_get_" + var[1] + "(long arg);\n"
1010
1011                 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"
1012                 out_c += "\t" + struct_name + " *inp = (" + struct_name + " *)(arg & ~1);\n"
1013                 out_c += "\tuint64_t res_ptr = (uint64_t)&inp->" + var[1] + ";\n"
1014                 out_c += "\tDO_ASSERT((res_ptr & 1) == 0);\n"
1015                 out_c += "\treturn (int64_t)(res_ptr | 1);\n"
1016                 out_c += "}\n"
1017
1018         return (out_java, out_java_trait, out_c)
1019
1020     def trait_struct_inc_refcnt(self, ty_info):
1021         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
1022         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
1023         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_cloned(&" + ty_info.var_name + "_conv);\n}"
1024         return base_conv
1025
1026     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
1027         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
1028         out_java_enum = ""
1029         out_java = ""
1030         out_c = ""
1031
1032         out_java_enum += (self.hu_struct_file_prefix)
1033         out_java_enum += "\n/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
1034         out_java_enum += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
1035         out_java_enum += ("public class " + java_hu_type + " extends CommonBase {\n")
1036         out_java_enum += ("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
1037         out_java_enum += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
1038         out_java_enum += ("\tprotected void finalize() throws Throwable {\n")
1039         out_java_enum += ("\t\tsuper.finalize();\n")
1040         out_java_enum += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK", "") + "_free(ptr); }\n")
1041         out_java_enum += ("\t}\n")
1042         out_java_enum += ("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
1043         out_java_enum += ("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
1044         java_hu_subclasses = ""
1045
1046         init_meth_jty_strs = {}
1047
1048         out_java +=  ("\tpublic static class " + struct_name + " {\n")
1049         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
1050         for var in variant_list:
1051             out_java +=  ("\t\tpublic final static class " + var.var_name + " extends " + struct_name + " {\n")
1052             java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var.var_name + " extends " + java_hu_type + " {\n"
1053             out_java_enum += ("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var.var_name + ".class) {\n")
1054             out_java_enum += ("\t\t\treturn new " + var.var_name + "(ptr, (bindings." + struct_name + "." + var.var_name + ")raw_val);\n")
1055             init_meth_jty_str = ""
1056             init_meth_params = ""
1057             init_meth_body = ""
1058             hu_conv_body = ""
1059             for idx, (field_ty, field_docs) in enumerate(var.fields):
1060                 if idx > 0:
1061                     init_meth_params = init_meth_params + ", "
1062
1063                 if field_ty.java_hu_ty == var.var_name:
1064                     field_path = field_ty.java_fn_ty_arg.strip("L;").replace("/", ".")
1065                     out_java += "\t\t\tpublic " + field_path + " " + field_ty.arg_name + ";\n"
1066                     java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_path + " " + field_ty.arg_name + ";\n"
1067                     init_meth_params = init_meth_params + field_path + " " + field_ty.arg_name
1068                 else:
1069                     out_java += "\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n"
1070                     if field_docs is not None:
1071                         java_hu_subclasses += "\t\t/**\n\t\t * " + field_docs.replace("\n", "\n\t\t * ") + "\n\t\t*/\n"
1072                     java_hu_subclasses += "\t\t"
1073                     if field_ty.nullable:
1074                         java_hu_subclasses += "@Nullable "
1075                     java_hu_subclasses += "public final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
1076                     init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
1077                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
1078                 if field_ty.to_hu_conv is not None:
1079                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1080                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1081                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1082                 else:
1083                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1084                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
1085             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
1086             out_java +=  (init_meth_body)
1087             out_java +=  ("}\n")
1088             out_java += ("\t\t}\n")
1089             out_java_enum += ("\t\t}\n")
1090             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"
1091             java_hu_subclasses = java_hu_subclasses + hu_conv_body
1092             java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
1093             init_meth_jty_strs[var.var_name] = init_meth_jty_str
1094         out_java += ("\t\tstatic native void init();\n")
1095         out_java += ("\t}\n")
1096         out_java_enum += ("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
1097         out_java_enum += (java_hu_subclasses)
1098         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
1099         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
1100
1101         out_c += (self.c_complex_enum_pfx(struct_name, [x.var_name for x in variant_list], init_meth_jty_strs))
1102
1103         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")
1104         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n")
1105         out_c += ("\tswitch(obj->tag) {\n")
1106         for var in variant_list:
1107             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
1108             c_params = []
1109             for idx, (field_map, field_docs) in enumerate(var.fields):
1110                 if field_map.ret_conv is not None:
1111                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1112                     if var.tuple_variant:
1113                         out_c += "obj->" + camel_to_snake(var.var_name)
1114                     else:
1115                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
1116                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1117                     c_params.append(field_map.ret_conv_name)
1118                 else:
1119                     if var.tuple_variant:
1120                         c_params.append("obj->" + camel_to_snake(var.var_name))
1121                     else:
1122                         c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
1123             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
1124             out_c += ("\t\t}\n")
1125         out_c += ("\t\tdefault: abort();\n")
1126         out_c += ("\t}\n}\n")
1127         return (out_java, out_java_enum, out_c)
1128
1129     def map_opaque_struct(self, struct_name, struct_doc_comment):
1130         out_opaque_struct_human = ""
1131         out_opaque_struct_human += self.hu_struct_file_prefix
1132         out_opaque_struct_human += "\n/**\n * " + struct_doc_comment.replace("\n", "\n * ") + "\n */\n"
1133         out_opaque_struct_human += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
1134         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
1135         out_opaque_struct_human += ("public class " + hu_name + " extends CommonBase")
1136         if struct_name.startswith("LDKLocked"):
1137             out_opaque_struct_human += (" implements AutoCloseable")
1138         out_opaque_struct_human += (" {\n")
1139         out_opaque_struct_human += ("\t" + hu_name + "(Object _dummy, long ptr) { super(ptr); }\n")
1140         if struct_name.startswith("LDKLocked"):
1141             out_opaque_struct_human += ("\t@Override public void close() {\n")
1142         else:
1143             out_opaque_struct_human += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
1144             out_opaque_struct_human += ("\tprotected void finalize() throws Throwable {\n")
1145             out_opaque_struct_human += ("\t\tsuper.finalize();\n")
1146         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
1147         out_opaque_struct_human += ("\t}\n\n")
1148         return out_opaque_struct_human
1149
1150     def map_tuple(self, struct_name):
1151         return self.map_opaque_struct(struct_name, "A Tuple")
1152
1153     def map_function(self, argument_types, c_call_string, method_name, meth_n, return_type_info, struct_meth, default_constructor_args, takes_self, takes_self_as_ref, args_known, type_mapping_generator, doc_comment):
1154         out_java = ""
1155         out_c = ""
1156         out_java_struct = None
1157
1158         out_java += ("\tpublic static native ")
1159         out_c += (self.c_fn_ty_pfx)
1160         out_c += (return_type_info.c_ty)
1161         out_java += (return_type_info.java_ty)
1162         if return_type_info.ret_conv is not None:
1163             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1164         out_java += (" " + method_name + "(")
1165         have_args = len(argument_types) > 1 or (len(argument_types) > 0 and argument_types[0].c_ty != "void")
1166         out_c += (" " + self.c_fn_name_define_pfx(method_name, have_args))
1167
1168         for idx, arg_conv_info in enumerate(argument_types):
1169             if idx != 0:
1170                 out_java += (", ")
1171                 out_c += (", ")
1172             if arg_conv_info.c_ty != "void":
1173                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1174                 out_java += (arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
1175
1176         out_java_struct = ""
1177         if not args_known:
1178             out_java_struct += ("\t// Skipped " + method_name + "\n")
1179         else:
1180             if doc_comment is not None:
1181                 out_java_struct += "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
1182             if return_type_info.nullable:
1183                 out_java_struct += "\t@Nullable\n"
1184             if not takes_self:
1185                 if meth_n == "new":
1186                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " of("
1187                 elif meth_n == "default":
1188                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " with_default("
1189                 else:
1190                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " " + meth_n + "("
1191             else:
1192                 out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
1193             for idx, arg in enumerate(argument_types):
1194                 if idx != 0:
1195                     if not takes_self or idx > 1:
1196                         out_java_struct += ", "
1197                 elif takes_self:
1198                     continue
1199                 if arg.java_ty != "void":
1200                     if arg.arg_name in default_constructor_args:
1201                         assert not arg.nullable
1202                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1203                             if explode_idx != 0:
1204                                 out_java_struct += (", ")
1205                             out_java_struct += (
1206                                 explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
1207                     else:
1208                         if arg.nullable:
1209                             out_java_struct += "@Nullable "
1210                         ty_string = arg.java_hu_ty
1211                         if arg.java_fn_ty_arg[0] == "L" and arg.java_fn_ty_arg[len(arg.java_fn_ty_arg) - 1] == ";":
1212                             ty_string = arg.java_fn_ty_arg.strip("L;").replace("/", ".")
1213                         out_java_struct += ty_string + " " + arg.arg_name
1214         out_java += (");\n")
1215         out_c += (") {\n")
1216         if out_java_struct is not None:
1217             out_java_struct += (") {\n")
1218         for info in argument_types:
1219             if info.arg_conv is not None:
1220                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1221         if return_type_info.ret_conv is not None:
1222             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1223         elif return_type_info.c_ty != "void":
1224             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1225         else:
1226             out_c += ("\t")
1227         if c_call_string is None:
1228             out_c += (method_name + "(")
1229         else:
1230             out_c += (c_call_string)
1231         for idx, info in enumerate(argument_types):
1232             if info.arg_conv_name is not None:
1233                 if idx != 0:
1234                     out_c += (", ")
1235                 elif c_call_string is not None:
1236                     continue
1237                 out_c += (info.arg_conv_name)
1238         out_c += (")")
1239         if return_type_info.ret_conv is not None:
1240             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1241         else:
1242             out_c += (";")
1243         for info in argument_types:
1244             if info.arg_conv_cleanup is not None:
1245                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1246         if return_type_info.ret_conv is not None:
1247             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1248         elif return_type_info.c_ty != "void":
1249             out_c += ("\n\treturn ret_val;")
1250         out_c += ("\n}\n\n")
1251
1252         if args_known:
1253             out_java_struct += ("\t\t")
1254             if return_type_info.java_ty != "void":
1255                 out_java_struct += (return_type_info.java_ty + " ret = ")
1256             out_java_struct += ("bindings." + method_name + "(")
1257             for idx, info in enumerate(argument_types):
1258                 if idx != 0:
1259                     out_java_struct += (", ")
1260                 if idx == 0 and takes_self:
1261                     out_java_struct += ("this.ptr")
1262                 elif info.arg_name in default_constructor_args:
1263                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1264                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1265                         if explode_idx != 0:
1266                             out_java_struct += (", ")
1267                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1268                         if explode_arg.from_hu_conv is not None:
1269                             out_java_struct += (
1270                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1271                         else:
1272                             out_java_struct += (expl_arg_name)
1273                     out_java_struct += (")")
1274                 elif info.from_hu_conv is not None:
1275                     out_java_struct += (info.from_hu_conv[0])
1276                 else:
1277                     out_java_struct += (info.arg_name)
1278             out_java_struct += (");\n")
1279             if return_type_info.java_ty == "long" and return_type_info.java_hu_ty != "long":
1280                 out_java_struct += "\t\tif (ret >= 0 && ret <= 4096) { return null; }\n"
1281
1282             if return_type_info.to_hu_conv is not None:
1283                 if not takes_self:
1284                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1285                                                                                                                return_type_info.to_hu_conv_name) + "\n")
1286                 else:
1287                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1288
1289             for idx, info in enumerate(argument_types):
1290                 if idx == 0 and takes_self:
1291                     pass
1292                 elif info.arg_name in default_constructor_args:
1293                     for explode_arg in default_constructor_args[info.arg_name]:
1294                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1295                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1296                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1297                                                                                                expl_arg_name).replace(
1298                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1299                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1300                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1301                         out_java_struct += (
1302                             "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1303                     else:
1304                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1305
1306             if takes_self and not takes_self_as_ref:
1307                 out_java_struct += "\t\t" + argument_types[0].from_hu_conv[1].replace("\n", "\n\t\t").replace("this_arg", "this") + ";\n"
1308             if return_type_info.to_hu_conv_name is not None:
1309                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1310             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1311                 out_java_struct += ("\t\treturn ret;\n")
1312             out_java_struct += ("\t}\n\n")
1313
1314         return (out_java, out_c, out_java_struct)