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