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

   1 from bindingstypes import *
   2 from enum import Enum
   3 import sys
   4
   5 class Target(Enum):
   6     JAVA = 1,
   7     ANDROID = 2
   8
   9 class Consts:
  10     def __init__(self, DEBUG: bool, target: Target, **kwargs):
  11         self.target = target
  12         self.c_array_class_caches = set()
  13         self.c_type_map = dict(
  14             uint8_t = ['byte'],
  15             uint16_t = ['short'],
  16             uint32_t = ['int'],
  17             uint64_t = ['long'],
  18         )
  19
  20         self.to_hu_conv_templates = dict(
  21             ptr = '{human_type} {var_name}_hu_conv = new {human_type}(null, {var_name});',
  22             default = '{human_type} {var_name}_hu_conv = new {human_type}(null, {var_name});'
  23         )
  24
  25         self.bindings_header = """package org.ldk.impl;
  26 import org.ldk.enums.*;
  27 import java.io.File;
  28 import java.io.InputStream;
  29 import java.io.IOException;
  30 import java.nio.file.Files;
  31 import java.nio.file.Path;
  32 import java.nio.file.StandardCopyOption;
  33
  34 public class bindings {
  35         public static class VecOrSliceDef {
  36                 public long dataptr;
  37                 public long datalen;
  38                 public long stride;
  39                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
  40                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
  41                 }
  42         }
  43         static {
  44                 try {
  45                         // Try to load natively first, this works on Android and in testing.
  46                         System.loadLibrary(\"lightningjni\");
  47                 } catch (UnsatisfiedLinkError system_load_err) {
  48                         // Otherwise try to load from the library jar.
  49                         File tmpdir = new File(System.getProperty("java.io.tmpdir"), "ldk-java-nativelib");
  50                         tmpdir.mkdir(); // If it fails to create, assume it was there already
  51                         tmpdir.deleteOnExit();
  52                         String libname = "liblightningjni_" + System.getProperty("os.name").replaceAll(" ", "") +
  53                                 "-" + System.getProperty("os.arch").replaceAll(" ", "") + ".nativelib";
  54                         try (InputStream is = bindings.class.getResourceAsStream("/" + libname)) {
  55                                 Path libpath = new File(tmpdir.toPath().toString(), "liblightningjni.so").toPath();
  56                                 Files.copy(is, libpath, StandardCopyOption.REPLACE_EXISTING);
  57                                 Runtime.getRuntime().load(libpath.toString());
  58                         } catch (IOException e) {
  59                                 System.err.println("Failed to load LDK native library.");
  60                                 System.err.println("System LDK native library load failed with: " + system_load_err);
  61                                 System.err.println("Resource-based LDK native library load failed with: " + e);
  62                                 throw new IllegalArgumentException(e);
  63                         }
  64                 }
  65                 init(java.lang.Enum.class, VecOrSliceDef.class);
  66                 init_class_cache();
  67                 if (!get_lib_version_string().equals(get_ldk_java_bindings_version()))
  68                         throw new IllegalArgumentException("Compiled LDK library and LDK class failes do not match");
  69                 // Fetching the LDK versions from C also checks that the header and binaries match
  70                 get_ldk_c_bindings_version();
  71                 get_ldk_version();
  72         }
  73         static native void init(java.lang.Class c, java.lang.Class slicedef);
  74         static native void init_class_cache();
  75         static native String get_lib_version_string();
  76
  77         public static String get_ldk_java_bindings_version() {
  78                 return "<git_version_ldk_garbagecollected>";
  79         }
  80         public static native String get_ldk_c_bindings_version();
  81         public static native String get_ldk_version();
  82
  83         public static native boolean deref_bool(long ptr);
  84         public static native long deref_long(long ptr);
  85         public static native void free_heap_ptr(long ptr);
  86         public static native byte[] read_bytes(long ptr, long len);
  87         public static native byte[] get_u8_slice_bytes(long slice_ptr);
  88         public static native long bytes_to_u8_vec(byte[] bytes);
  89         public static native long new_txpointer_copy_data(byte[] txdata);
  90         public static native void txpointer_free(long ptr);
  91         public static native byte[] txpointer_get_buffer(long ptr);
  92         public static native long vec_slice_len(long vec);
  93         public static native long new_empty_slice_vec();
  94
  95 """
  96
  97         self.bindings_footer = "}\n"
  98
  99         self.util_fn_pfx = """package org.ldk.structs;
 100 import org.ldk.impl.bindings;
 101 import java.util.Arrays;
 102 import javax.annotation.Nullable;
 103 import org.ldk.enums.*;
 104
 105 public class UtilMethods {
 106 """
 107         self.util_fn_sfx = "}"
 108         self.common_base = """package org.ldk.structs;
 109 import java.util.LinkedList;
 110 class CommonBase {
 111         long ptr;
 112         LinkedList<Object> ptrs_to = new LinkedList();
 113         protected CommonBase(long ptr) { assert ptr > 1024; this.ptr = ptr; }
 114 }
 115 """
 116
 117         self.c_file_pfx = """#include <jni.h>
 118 // On OSX jlong (ie long long) is not equivalent to int64_t, so we override here
 119 #define int64_t jlong
 120 #include \"org_ldk_impl_bindings.h\"
 121 #include <lightning.h>
 122 #include <string.h>
 123 #include <stdatomic.h>
 124 #include <stdlib.h>
 125
 126 """
 127
 128         if self.target == Target.ANDROID:
 129             self.c_file_pfx = self.c_file_pfx + """
 130 #include <android/log.h>
 131 #define DEBUG_PRINT(...) __android_log_print(ANDROID_LOG_ERROR, "LDK", __VA_ARGS__)
 132
 133 #include <unistd.h>
 134 #include <pthread.h>
 135 static void* redirect_stderr(void* ignored) {
 136         int pipes[2];
 137         pipe(pipes);
 138         dup2(pipes[1], STDERR_FILENO);
 139         char buf[8192];
 140         memset(buf, 0, 8192);
 141         ssize_t len;
 142         while ((len = read(pipes[0], buf, 8191)) > 0) {
 143                 DEBUG_PRINT("%s\\n", buf);
 144                 memset(buf, 0, 8192);
 145         }
 146         DEBUG_PRINT("End of stderr???\\n");
 147         return 0;
 148 }
 149 void __attribute__((constructor)) spawn_stderr_redirection() {
 150         pthread_t thread;
 151         pthread_create(&thread, NULL, &redirect_stderr, NULL);
 152 }
 153 """
 154         else:
 155             self.c_file_pfx = self.c_file_pfx + "#define DEBUG_PRINT(...) fprintf(stderr, __VA_ARGS__)\n"
 156
 157         if not DEBUG or sys.platform == "darwin":
 158             self.c_file_pfx = self.c_file_pfx + """#define MALLOC(a, _) malloc(a)
 159 #define FREE(p) if ((uint64_t)(p) > 1024) { free(p); }
 160 """
 161         if not DEBUG:
 162             self.c_file_pfx += """#define DO_ASSERT(a) (void)(a)
 163 #define CHECK(a)
 164 """
 165         if DEBUG:
 166             self.c_file_pfx = self.c_file_pfx + """#include <assert.h>
 167 // Always run a, then assert it is true:
 168 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 169 // Assert a is true or do nothing
 170 #define CHECK(a) DO_ASSERT(a)
 171
 172 void __attribute__((constructor)) debug_log_version() {
 173         if (check_get_ldk_version() == NULL)
 174                 DEBUG_PRINT("LDK version did not match the header we built against\\n");
 175         if (check_get_ldk_bindings_version() == NULL)
 176                 DEBUG_PRINT("LDK C Bindings version did not match the header we built against\\n");
 177         DEBUG_PRINT("Loaded LDK-Java Bindings with LDK %s and LDK-C-Bindings %s\\n", check_get_ldk_version(), check_get_ldk_bindings_version());
 178 }
 179 """
 180
 181             if sys.platform != "darwin":
 182                 self.c_file_pfx += """
 183 // Running a leak check across all the allocations and frees of the JDK is a mess,
 184 // so instead we implement our own naive leak checker here, relying on the -wrap
 185 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 186 // and free'd in Rust or C across the generated bindings shared library.
 187 #include <threads.h>
 188 """
 189
 190                 if self.target == Target.ANDROID:
 191                     self.c_file_pfx = self.c_file_pfx + """
 192 #include <unwind.h>
 193 #include <dlfcn.h>
 194
 195 // Implement the execinfo functions using _Unwind_backtrace. This seems to miss many Rust
 196 // symbols, so we only use it on Android, where execinfo.h is unavailable.
 197
 198 struct BacktraceState {
 199         void** current;
 200         void** end;
 201 };
 202 static _Unwind_Reason_Code unwind_callback(struct _Unwind_Context* context, void* arg) {
 203         struct BacktraceState* state = (struct BacktraceState*)arg;
 204         uintptr_t pc = _Unwind_GetIP(context);
 205         if (pc) {
 206                 if (state->current == state->end) {
 207                         return _URC_END_OF_STACK;
 208                 } else {
 209                         *state->current++ = (void*)(pc);
 210                 }
 211         }
 212         return _URC_NO_REASON;
 213 }
 214
 215 int backtrace(void** buffer, int max) {
 216         struct BacktraceState state = { buffer, buffer + max };
 217         _Unwind_Backtrace(unwind_callback, &state);
 218         return state.current - buffer;
 219 }
 220
 221 void backtrace_symbols_fd(void ** buffer, int count, int _fd) {
 222         for (int idx = 0; idx < count; ++idx) {
 223                 Dl_info info;
 224                 if (dladdr(buffer[idx], &info) && info.dli_sname) {
 225                         DEBUG_PRINT("%p: %s", buffer[idx], info.dli_sname);
 226                 } else {
 227                         DEBUG_PRINT("%p: ???", buffer[idx]);
 228                 }
 229         }
 230 }
 231 """
 232                 else:
 233                     self.c_file_pfx = self.c_file_pfx + "#include <execinfo.h>\n"
 234                 self.c_file_pfx = self.c_file_pfx + """
 235 #include <unistd.h>
 236 #include <pthread.h>
 237 static pthread_mutex_t allocation_mtx;
 238
 239 void __attribute__((constructor)) init_mtx() {
 240         DO_ASSERT(!pthread_mutex_init(&allocation_mtx, NULL));
 241 }
 242
 243 #define BT_MAX 128
 244 typedef struct allocation {
 245         struct allocation* next;
 246         void* ptr;
 247         const char* struct_name;
 248         void* bt[BT_MAX];
 249         int bt_len;
 250         unsigned long alloc_len;
 251 } allocation;
 252 static allocation* allocation_ll = NULL;
 253
 254 void* __real_malloc(size_t len);
 255 void* __real_calloc(size_t nmemb, size_t len);
 256 static void new_allocation(void* res, const char* struct_name, size_t len) {
 257         allocation* new_alloc = __real_malloc(sizeof(allocation));
 258         new_alloc->ptr = res;
 259         new_alloc->struct_name = struct_name;
 260         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 261         new_alloc->alloc_len = len;
 262         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 263         new_alloc->next = allocation_ll;
 264         allocation_ll = new_alloc;
 265         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 266 }
 267 static void* MALLOC(size_t len, const char* struct_name) {
 268         void* res = __real_malloc(len);
 269         new_allocation(res, struct_name, len);
 270         return res;
 271 }
 272 void __real_free(void* ptr);
 273 static void alloc_freed(void* ptr) {
 274         allocation* p = NULL;
 275         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 276         allocation* it = allocation_ll;
 277         while (it->ptr != ptr) {
 278                 p = it; it = it->next;
 279                 if (it == NULL) {
 280                         DEBUG_PRINT("Tried to free unknown pointer %p at:\\n", ptr);
 281                         void* bt[BT_MAX];
 282                         int bt_len = backtrace(bt, BT_MAX);
 283                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 284                         DEBUG_PRINT("\\n\\n");
 285                         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 286                         return; // addrsan should catch malloc-unknown and print more info than we have
 287                 }
 288         }
 289         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 290         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 291         DO_ASSERT(it->ptr == ptr);
 292         __real_free(it);
 293 }
 294 static void FREE(void* ptr) {
 295         if ((uint64_t)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 296         alloc_freed(ptr);
 297         __real_free(ptr);
 298 }
 299
 300 void* __wrap_malloc(size_t len) {
 301         void* res = __real_malloc(len);
 302         new_allocation(res, "malloc call", len);
 303         return res;
 304 }
 305 void* __wrap_calloc(size_t nmemb, size_t len) {
 306         void* res = __real_calloc(nmemb, len);
 307         new_allocation(res, "calloc call", len);
 308         return res;
 309 }
 310 void __wrap_free(void* ptr) {
 311         if (ptr == NULL) return;
 312         alloc_freed(ptr);
 313         __real_free(ptr);
 314 }
 315
 316 void* __real_realloc(void* ptr, size_t newlen);
 317 void* __wrap_realloc(void* ptr, size_t len) {
 318         if (ptr != NULL) alloc_freed(ptr);
 319         void* res = __real_realloc(ptr, len);
 320         new_allocation(res, "realloc call", len);
 321         return res;
 322 }
 323 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 324         // Rust doesn't seem to use reallocarray currently
 325         DO_ASSERT(false);
 326 }
 327
 328 void __attribute__((destructor)) check_leaks() {
 329         unsigned long alloc_count = 0;
 330         unsigned long alloc_size = 0;
 331         DEBUG_PRINT("The following LDK-allocated blocks still remain.\\n");
 332         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 333         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 334         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 335                 DEBUG_PRINT("%s %p (%lu bytes) remains:\\n", a->struct_name, a->ptr, a->alloc_len);
 336                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 337                 DEBUG_PRINT("\\n\\n");
 338                 alloc_count++;
 339                 alloc_size += a->alloc_len;
 340         }
 341         DEBUG_PRINT("%lu allocations remained for %lu bytes.\\n", alloc_count, alloc_size);
 342         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 343         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 344 }
 345 """
 346         self.c_file_pfx = self.c_file_pfx + """
 347 static jmethodID ordinal_meth = NULL;
 348 static jmethodID slicedef_meth = NULL;
 349 static jclass slicedef_cls = NULL;
 350 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 351         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 352         CHECK(ordinal_meth != NULL);
 353         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 354         CHECK(slicedef_meth != NULL);
 355         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 356         CHECK(slicedef_cls != NULL);
 357 }
 358
 359 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 360         return *((bool*)ptr);
 361 }
 362 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 363         return *((long*)ptr);
 364 }
 365 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 366         FREE((void*)ptr);
 367 }
 368 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * env, jclass _b, jlong ptr, jlong len) {
 369         jbyteArray ret_arr = (*env)->NewByteArray(env, len);
 370         (*env)->SetByteArrayRegion(env, ret_arr, 0, len, (unsigned char*)ptr);
 371         return ret_arr;
 372 }
 373 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * env, jclass _b, jlong slice_ptr) {
 374         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 375         jbyteArray ret_arr = (*env)->NewByteArray(env, slice->datalen);
 376         (*env)->SetByteArrayRegion(env, ret_arr, 0, slice->datalen, slice->data);
 377         return ret_arr;
 378 }
 379 JNIEXPORT int64_t impl_bindings_bytes_1to_1u8_1vec (JNIEnv * env, jclass _b, jbyteArray bytes) {
 380         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 381         vec->datalen = (*env)->GetArrayLength(env, bytes);
 382         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 383         (*env)->GetByteArrayRegion (env, bytes, 0, vec->datalen, vec->data);
 384         return (uint64_t)vec;
 385 }
 386 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_txpointer_1get_1buffer (JNIEnv * env, jclass _b, jlong ptr) {
 387         LDKTransaction *txdata = (LDKTransaction*)ptr;
 388         LDKu8slice slice;
 389         slice.data = txdata->data;
 390         slice.datalen = txdata->datalen;
 391         return Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes(env, _b, (uint64_t)&slice);
 392 }
 393 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 394         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 395         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 396         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 397         txdata->data_is_owned = false;
 398         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
 399         return (uint64_t)txdata;
 400 }
 401 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_txpointer_1free (JNIEnv * env, jclass _b, jlong ptr) {
 402         LDKTransaction *tx = (LDKTransaction*)ptr;
 403         tx->data_is_owned = true;
 404         Transaction_free(*tx);
 405         FREE((void*)ptr);
 406 }
 407 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 408         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 409         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
 410         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
 411         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
 412         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
 413         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 414         return (uint64_t)vec->datalen;
 415 }
 416 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * env, jclass _b) {
 417         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
 418         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
 419         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
 420         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
 421         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
 422         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
 423         vec->data = NULL;
 424         vec->datalen = 0;
 425         return (uint64_t)vec;
 426 }
 427
 428 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 429 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 430 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 431 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 432
 433 _Static_assert(sizeof(jlong) == sizeof(int64_t), "We assume that j-types are the same as C types");
 434 _Static_assert(sizeof(jbyte) == sizeof(char), "We assume that j-types are the same as C types");
 435 _Static_assert(sizeof(void*) <= 8, "Pointers must fit into 64 bits");
 436
 437 typedef jlongArray int64_tArray;
 438 typedef jbyteArray int8_tArray;
 439
 440 static inline jstring str_ref_to_java(JNIEnv *env, const char* chars, size_t len) {
 441         // Sadly we need to create a temporary because Java can't accept a char* without a 0-terminator
 442         char* conv_buf = MALLOC(len + 1, "str conv buf");
 443         memcpy(conv_buf, chars, len);
 444         conv_buf[len] = 0;
 445         jstring ret = (*env)->NewStringUTF(env, conv_buf);
 446         FREE(conv_buf);
 447         return ret;
 448 }
 449 static inline LDKStr java_to_owned_str(JNIEnv *env, jstring str) {
 450         uint64_t str_len = (*env)->GetStringUTFLength(env, str);
 451         char* newchars = MALLOC(str_len + 1, "String chars");
 452         const char* jchars = (*env)->GetStringUTFChars(env, str, NULL);
 453         memcpy(newchars, jchars, str_len);
 454         newchars[str_len] = 0;
 455         (*env)->ReleaseStringUTFChars(env, str, jchars);
 456         LDKStr res = {
 457                 .chars = newchars,
 458                 .len = str_len,
 459                 .chars_is_owned = true
 460         };
 461         return res;
 462 }
 463
 464 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1lib_1version_1string(JNIEnv *env, jclass _c) {
 465         return str_ref_to_java(env, "<git_version_ldk_garbagecollected>", strlen("<git_version_ldk_garbagecollected>"));
 466 }
 467 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1ldk_1c_1bindings_1version(JNIEnv *env, jclass _c) {
 468         return str_ref_to_java(env, check_get_ldk_bindings_version(), strlen(check_get_ldk_bindings_version()));
 469 }
 470 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1ldk_1version(JNIEnv *env, jclass _c) {
 471         return str_ref_to_java(env, check_get_ldk_version(), strlen(check_get_ldk_version()));
 472 }
 473 """
 474
 475         self.hu_struct_file_prefix = """package org.ldk.structs;
 476
 477 import org.ldk.impl.bindings;
 478 import org.ldk.enums.*;
 479 import org.ldk.util.*;
 480 import java.util.Arrays;
 481 import javax.annotation.Nullable;
 482
 483 """
 484         self.c_fn_ty_pfx = "JNIEXPORT "
 485         self.c_fn_args_pfx = "JNIEnv *env, jclass clz"
 486         self.file_ext = ".java"
 487         self.ptr_c_ty = "int64_t"
 488         self.ptr_native_ty = "long"
 489         self.result_c_ty = "jclass"
 490         self.ptr_arr = "jobjectArray"
 491         self.is_arr_some_check = ("", " != NULL")
 492         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 493
 494     def construct_jenv(self):
 495         res =  "JNIEnv *env;\n"
 496         res += "jint get_jenv_res = (*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_6);\n"
 497         res += "if (get_jenv_res == JNI_EDETACHED) {\n"
 498         if self.target == Target.ANDROID:
 499             res += "\tDO_ASSERT((*j_calls->vm)->AttachCurrentThread(j_calls->vm, &env, NULL) == JNI_OK);\n"
 500         else:
 501             res += "\tDO_ASSERT((*j_calls->vm)->AttachCurrentThread(j_calls->vm, (void**)&env, NULL) == JNI_OK);\n"
 502         res += "} else {\n"
 503         res += "\tDO_ASSERT(get_jenv_res == JNI_OK);\n"
 504         res += "}\n"
 505         return res
 506     def deconstruct_jenv(self):
 507         res = "if (get_jenv_res == JNI_EDETACHED) {\n"
 508         res += "\tDO_ASSERT((*j_calls->vm)->DetachCurrentThread(j_calls->vm) == JNI_OK);\n"
 509         res += "}\n"
 510         return res
 511
 512     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 513         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 514             return "(*env)->ReleasePrimitiveArrayCritical(env, " + arr_var + ", " + arr_ptr_var + ", 0)"
 515         return None
 516     def create_native_arr_call(self, arr_len, ty_info):
 517         if ty_info.c_ty == "int8_tArray":
 518             return "(*env)->NewByteArray(env, " + arr_len + ")"
 519         elif ty_info.subty.c_ty.endswith("Array"):
 520             clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 521             self.c_array_class_caches.add(clz_var)
 522             return "(*env)->NewObjectArray(env, " + arr_len + ", " + clz_var + "_clz, NULL);\n"
 523         else:
 524             return "(*env)->New" + ty_info.java_ty.strip("[]").title() + "Array(env, " + arr_len + ")"
 525     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 526         if ty_info.c_ty == "int8_tArray":
 527             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 528         else:
 529             assert False
 530     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 531         if ty_info.c_ty == "int8_tArray":
 532             if copy:
 533                 return "(*env)->GetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", " + dest_name + ")"
 534             else:
 535                 return "(*env)->GetByteArrayElements (env, " + arr_name + ", NULL)"
 536         elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 537             return "(*env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (env, " + arr_name + ", NULL)"
 538         else:
 539             return None
 540     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 541         if self.get_native_arr_contents(arr_name, "", "", ty_info, False) is None:
 542             return "(*env)->GetObjectArrayElement(env, " + arr_name + ", " + idxc + ")"
 543         else:
 544             assert False # Only called if above is None
 545     def get_native_arr_ptr_call(self, ty_info):
 546         if ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"):
 547             return None
 548         return ("(*env)->GetPrimitiveArrayCritical(env, ", ", NULL)")
 549     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 550         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 551             return None
 552         return "(*env)->SetObjectArrayElement(env, " + arr_name + ", " + idxc + ", " + entry_access + ")"
 553     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 554         if ty_info.c_ty == "int8_tArray":
 555             return "(*env)->ReleaseByteArrayElements(env, " + arr_name + ", (int8_t*)" + dest_name + ", 0);"
 556         else:
 557             return "(*env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements(env, " + arr_name + ", " + dest_name + ", 0)"
 558
 559     def str_ref_to_native_call(self, var_name, str_len):
 560         return "str_ref_to_java(env, " + var_name + ", " + str_len + ")"
 561     def str_ref_to_c_call(self, var_name):
 562         return "java_to_owned_str(env, " + var_name + ")"
 563
 564     def c_fn_name_define_pfx(self, fn_name, has_args):
 565         if has_args:
 566             return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz, "
 567         return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz"
 568
 569     def init_str(self):
 570         res = ""
 571         for ty in sorted(self.c_array_class_caches):
 572             res = res + "static jclass " + ty + "_clz = NULL;\n"
 573         res = res + "JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass clz) {\n"
 574         for ty in sorted(self.c_array_class_caches):
 575             res = res + "\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n"
 576             res = res + "\tCHECK(" + ty + "_clz != NULL);\n"
 577             res = res + "\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n"
 578         res = res + "}\n"
 579         return res
 580
 581     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 582         out_java_enum = "package org.ldk.enums;\n\n"
 583         out_java = ""
 584         out_c = ""
 585         out_c = out_c + "static inline LDK" + struct_name + " LDK" + struct_name + "_from_java(" + self.c_fn_args_pfx + ") {\n"
 586         out_c = out_c + "\tswitch ((*env)->CallIntMethod(env, clz, ordinal_meth)) {\n"
 587
 588         if enum_doc_comment is not None:
 589             out_java_enum += "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
 590         out_java_enum += "public enum " + struct_name + " {\n"
 591         ord_v = 0
 592         for var in variants:
 593             out_java_enum = out_java_enum + "\t" + var + ",\n"
 594             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 595             ord_v = ord_v + 1
 596         out_java_enum = out_java_enum + "\t; static native void init();\n"
 597         out_java_enum = out_java_enum + "\tstatic { init(); }\n"
 598         out_java_enum = out_java_enum + "}"
 599         out_java = out_java + "\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n"
 600         out_c = out_c + "\t}\n"
 601         out_c = out_c + "\tabort();\n"
 602         out_c = out_c + "}\n"
 603
 604         out_c = out_c + "static jclass " + struct_name + "_class = NULL;\n"
 605         for var in variants:
 606             out_c = out_c + "static jfieldID " + struct_name + "_" + var + " = NULL;\n"
 607         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"
 608         out_c = out_c + "\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n"
 609         out_c = out_c + "\tCHECK(" + struct_name + "_class != NULL);\n"
 610         for var in variants:
 611             out_c = out_c + "\t" + struct_name + "_" + var + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + var + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n"
 612             out_c = out_c + "\tCHECK(" + struct_name + "_" + var + " != NULL);\n"
 613         out_c = out_c + "}\n"
 614         out_c = out_c + "static inline jclass LDK" + struct_name + "_to_java(JNIEnv *env, LDK" + struct_name + " val) {\n"
 615         out_c = out_c + "\tswitch (val) {\n"
 616         ord_v = 0
 617         for var in variants:
 618             out_c = out_c + "\t\tcase " + var + ":\n"
 619             out_c = out_c + "\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + var + ");\n"
 620             ord_v = ord_v + 1
 621         out_c = out_c + "\t\tdefault: abort();\n"
 622         out_c = out_c + "\t}\n"
 623         out_c = out_c + "}\n\n"
 624
 625         return (out_c, out_java_enum, out_java)
 626
 627     def c_unitary_enum_to_native_call(self, ty_info):
 628         return (ty_info.rust_obj + "_to_java(env, ", ")")
 629     def native_unitary_enum_to_c_call(self, ty_info):
 630         return (ty_info.rust_obj + "_from_java(env, ", ")")
 631
 632     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 633         out_c = ""
 634         for var in variants:
 635             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 636             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 637         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"
 638         for var_name in variants:
 639             out_c = out_c + "\t" + struct_name + "_" + var_name + "_class =\n"
 640             if self.target == Target.ANDROID:
 641                 out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"org/ldk/impl/bindings$" + struct_name + "$" + var_name + "\"));\n"
 642             else:
 643                 out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n"
 644             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 645             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"
 646             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 647         out_c = out_c + "}\n"
 648         return out_c
 649
 650     def c_complex_enum_pass_ty(self, struct_name):
 651         return "jobject"
 652
 653     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 654         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 655         for param in c_params:
 656             ret = ret + ", " + param
 657         return ret + ")"
 658
 659     def native_c_map_trait(self, struct_name, field_vars, flattened_field_vars, field_fns, trait_doc_comment):
 660         out_java_trait = ""
 661         out_java = ""
 662
 663         # First generate most of the Java code, note that we need information about java method argument strings for C
 664         out_java_trait = out_java_trait + self.hu_struct_file_prefix
 665         if trait_doc_comment is not None:
 666             out_java_trait += "/**\n * " + trait_doc_comment.replace("\n", "\n * ") + "\n */\n"
 667         out_java_trait += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
 668         out_java_trait = out_java_trait + "public class " + struct_name.replace("LDK","") + " extends CommonBase {\n"
 669         out_java_trait = out_java_trait + "\tfinal bindings." + struct_name + " bindings_instance;\n"
 670         out_java_trait = out_java_trait + "\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n"
 671         out_java_trait = out_java_trait + "\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg"
 672         for var in flattened_field_vars:
 673             if isinstance(var, ConvInfo):
 674                 out_java_trait = out_java_trait + ", " + var.java_hu_ty + " " + var.arg_name
 675             else:
 676                 out_java_trait = out_java_trait + ", bindings." + var[0] + " " + var[1]
 677         out_java_trait = out_java_trait + ") {\n"
 678         out_java_trait = out_java_trait + "\t\tsuper(bindings." + struct_name + "_new(arg"
 679         for var in flattened_field_vars:
 680             if isinstance(var, ConvInfo):
 681                 if var.from_hu_conv is not None:
 682                     out_java_trait = out_java_trait + ", " + var.from_hu_conv[0]
 683                 else:
 684                     out_java_trait = out_java_trait + ", " + var.arg_name
 685             else:
 686                 out_java_trait = out_java_trait + ", " + var[1]
 687         out_java_trait = out_java_trait + "));\n"
 688         out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(arg);\n"
 689         for var in flattened_field_vars:
 690             if isinstance(var, ConvInfo):
 691                 if var.from_hu_conv is not None and var.from_hu_conv[1] != "":
 692                     out_java_trait = out_java_trait + "\t\t" + var.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n"
 693             else:
 694                 out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(" + var[1] + ");\n"
 695         out_java_trait = out_java_trait + "\t\tthis.bindings_instance = arg;\n"
 696         out_java_trait = out_java_trait + "\t}\n"
 697         out_java_trait = out_java_trait + "\t@Override @SuppressWarnings(\"deprecation\")\n"
 698         out_java_trait = out_java_trait + "\tprotected void finalize() throws Throwable {\n"
 699         out_java_trait = out_java_trait + "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n"
 700         out_java_trait = out_java_trait + "\t}\n\n"
 701
 702         java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
 703         java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 704         for var in flattened_field_vars:
 705             if isinstance(var, ConvInfo):
 706                 java_trait_constr = java_trait_constr + ", " + var.java_hu_ty + " " + var.arg_name
 707             else:
 708                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 709                 # Java-implemented version, so we require users pass a Java implementation here :/
 710                 java_trait_constr = java_trait_constr + ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 711         java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 712         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
 713         out_java_trait = out_java_trait + "\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n"
 714         out_java = out_java + "\tpublic interface " + struct_name + " {\n"
 715         java_meths = []
 716         for fn_line in field_fns:
 717             java_meth_descr = "("
 718             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 719                 out_java = out_java + "\t\t " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 720                 java_trait_constr = java_trait_constr + "\t\t\t@Override public " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 721                 out_java_trait += "\t\t/**\n\t\t * " + fn_line.docs.replace("\n", "\n\t\t * ") + "\n\t\t */\n"
 722                 out_java_trait = out_java_trait + "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_line.fn_name + "("
 723
 724                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 725                     if idx >= 1:
 726                         out_java = out_java + ", "
 727                         java_trait_constr = java_trait_constr + ", "
 728                         out_java_trait = out_java_trait + ", "
 729                     out_java = out_java + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 730                     out_java_trait = out_java_trait + arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name
 731                     java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 732                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 733                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 734                 java_meths.append((fn_line.fn_name, java_meth_descr))
 735
 736                 out_java = out_java + ");\n"
 737                 out_java_trait = out_java_trait + ");\n"
 738                 java_trait_constr = java_trait_constr + ") {\n"
 739
 740                 for arg_info in fn_line.args_ty:
 741                     if arg_info.to_hu_conv is not None:
 742                         java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 743
 744                 if fn_line.ret_ty_info.java_ty != "void":
 745                     java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 746                 else:
 747                     java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.fn_name + "("
 748
 749                 for idx, arg_info in enumerate(fn_line.args_ty):
 750                     if idx != 0:
 751                         java_trait_constr = java_trait_constr + ", "
 752                     if arg_info.to_hu_conv_name is not None:
 753                         java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
 754                     else:
 755                         java_trait_constr = java_trait_constr + arg_info.arg_name
 756
 757                 java_trait_constr = java_trait_constr + ");\n"
 758                 if fn_line.ret_ty_info.java_ty != "void":
 759                     if fn_line.ret_ty_info.from_hu_conv is not None:
 760                         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"
 761                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 762                             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"
 763                         #if fn_line.ret_ty_info.rust_obj in result_types:
 764                         java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
 765                     else:
 766                         java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
 767                 java_trait_constr = java_trait_constr + "\t\t\t}\n"
 768         java_trait_constr = java_trait_constr + "\t\t}"
 769         for var in field_vars:
 770             if isinstance(var, ConvInfo):
 771                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 772             else:
 773                 java_trait_constr += ", " + var[1] + ".new_impl(" + var[1] + "_impl"
 774                 for suparg in var[2]:
 775                     if isinstance(suparg, ConvInfo):
 776                         java_trait_constr += ", " + suparg.arg_name
 777                     else:
 778                         java_trait_constr += ", " + suparg[1]
 779                 java_trait_constr += ").bindings_instance"
 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         out_java_trait = out_java_trait + "\t}\n"
 786         out_java_trait = out_java_trait + java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 787
 788         out_java = out_java + "\t}\n"
 789
 790         out_java = out_java + "\tpublic static native long " + struct_name + "_new(" + struct_name + " impl"
 791         for var in flattened_field_vars:
 792             if isinstance(var, ConvInfo):
 793                 out_java = out_java + ", " + var.java_ty + " " + var.arg_name
 794             else:
 795                 out_java = out_java + ", " + var[0] + " " + var[1]
 796         out_java = out_java + ");\n"
 797
 798         # Now that we've written out our java code (and created java_meths), generate C
 799         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 800         out_c = out_c + "\tatomic_size_t refcnt;\n"
 801         out_c = out_c + "\tJavaVM *vm;\n"
 802         out_c = out_c + "\tjweak o;\n"
 803         for var in flattened_field_vars:
 804             if isinstance(var, ConvInfo):
 805                 # We're a regular ol' field
 806                 pass
 807             else:
 808                 # We're a supertrait
 809                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 810         for fn in field_fns:
 811             if fn.fn_name != "free" and fn.fn_name != "cloned":
 812                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 813         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 814
 815         for fn_line in field_fns:
 816             if fn_line.fn_name == "free":
 817                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 818                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 819                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 820                 out_c += "\t\t" + self.construct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 821                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 822                 out_c += "\t\t" + self.deconstruct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 823                 out_c = out_c + "\t\tFREE(j_calls);\n"
 824                 out_c = out_c + "\t}\n}\n"
 825
 826         for idx, fn_line in enumerate(field_fns):
 827             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 828                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 829                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 830                 if fn_line.self_is_const:
 831                     out_c = out_c + "const void* this_arg"
 832                 else:
 833                     out_c = out_c + "void* this_arg"
 834
 835                 for idx, arg in enumerate(fn_line.args_ty):
 836                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 837
 838                 out_c = out_c + ") {\n"
 839                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 840                 out_c += "\t" + self.construct_jenv().replace("\n", "\n\t").strip() + "\n"
 841
 842                 for arg_info in fn_line.args_ty:
 843                     if arg_info.ret_conv is not None:
 844                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 845                         out_c = out_c + arg_info.arg_name
 846                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 847
 848                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 849                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 850                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 851                 elif fn_line.ret_ty_info.c_ty == "void":
 852                     out_c += "\t(*env)->Call" + fn_line.ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 853                 elif fn_line.ret_ty_info.java_ty == "String":
 854                     # Manually write out String methods as they're just an Object
 855                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 856                 elif not fn_line.ret_ty_info.passed_as_ptr:
 857                     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"
 858                 else:
 859                     out_c = out_c + "\tuint64_t ret = (*env)->CallLongMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 860
 861                 for idx, arg_info in enumerate(fn_line.args_ty):
 862                     if arg_info.ret_conv is not None:
 863                         out_c = out_c + ", " + arg_info.ret_conv_name
 864                     else:
 865                         out_c = out_c + ", " + arg_info.arg_name
 866                 out_c = out_c + ");\n"
 867
 868                 out_c += "\tif ((*env)->ExceptionCheck(env)) {\n"
 869                 out_c += "\t\t(*env)->ExceptionDescribe(env);\n"
 870                 out_c += "\t\t(*env)->FatalError(env, \"A call to " + fn_line.fn_name + " in " + struct_name + " from rust threw an exception.\");\n"
 871                 out_c += "\t}\n"
 872
 873                 if fn_line.ret_ty_info.arg_conv is not None:
 874                     out_c += "\t" + fn_line.ret_ty_info.arg_conv.replace("\n", "\n\t") + "\n"
 875                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
 876                     out_c += "\treturn " + fn_line.ret_ty_info.arg_conv_name + ";\n"
 877                 else:
 878                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
 879                     if not fn_line.ret_ty_info.passed_as_ptr and fn_line.ret_ty_info.c_ty != "void":
 880                         out_c += "\treturn ret;\n"
 881
 882                 out_c = out_c + "}\n"
 883
 884         # If we can, write out a clone function whether we need one or not, as we use them in moving to rust
 885         can_clone_with_ptr = True
 886         for var in field_vars:
 887             if isinstance(var, ConvInfo):
 888                 can_clone_with_ptr = False
 889         if can_clone_with_ptr:
 890             out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
 891             out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
 892             out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 893             for var in field_vars:
 894                 if not isinstance(var, ConvInfo):
 895                     out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 896             out_c = out_c + "}\n"
 897
 898         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 899         for var in flattened_field_vars:
 900             if isinstance(var, ConvInfo):
 901                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 902             else:
 903                 out_c = out_c + ", jobject " + var[1]
 904         out_c = out_c + ") {\n"
 905
 906         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 907         out_c = out_c + "\tCHECK(c != NULL);\n"
 908         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 909         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 910         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 911         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 912
 913         for (fn_name, java_meth_descr) in java_meths:
 914             if fn_name != "free" and fn_name != "cloned":
 915                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 916                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 917
 918         for var in flattened_field_vars:
 919             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 920                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 921         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 922         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 923         for fn_line in field_fns:
 924             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 925                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 926             elif fn_line.fn_name == "free":
 927                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 928             else:
 929                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
 930         for var in field_vars:
 931             if isinstance(var, ConvInfo):
 932                 if var.arg_conv_name is not None:
 933                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 934                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 935                 else:
 936                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 937                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 938             else:
 939                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1]
 940                 for suparg in var[2]:
 941                     if isinstance(suparg, ConvInfo):
 942                         out_c = out_c + ", " + suparg.arg_name
 943                     else:
 944                         out_c = out_c + ", " + suparg[1]
 945                 out_c += "),\n"
 946         out_c = out_c + "\t};\n"
 947         for var in flattened_field_vars:
 948             if not isinstance(var, ConvInfo):
 949                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 950         out_c = out_c + "\treturn ret;\n"
 951         out_c = out_c + "}\n"
 952
 953         out_c = out_c + self.c_fn_ty_pfx + "int64_t " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "jobject o"
 954         for var in flattened_field_vars:
 955             if isinstance(var, ConvInfo):
 956                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 957             else:
 958                 out_c = out_c + ", jobject " + var[1]
 959         out_c = out_c + ") {\n"
 960         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 961         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 962         for var in flattened_field_vars:
 963             if isinstance(var, ConvInfo):
 964                 out_c = out_c + ", " + var.arg_name
 965             else:
 966                 out_c = out_c + ", " + var[1]
 967         out_c = out_c + ");\n"
 968         out_c = out_c + "\treturn (uint64_t)res_ptr;\n"
 969         out_c = out_c + "}\n"
 970
 971         for var in flattened_field_vars:
 972             if not isinstance(var, ConvInfo):
 973                 out_java_trait += "\n\t/**\n"
 974                 out_java_trait += "\t * Gets the underlying " + var[1] + ".\n"
 975                 out_java_trait += "\t */\n"
 976                 underscore_name = ''.join('_' + c.lower() if c.isupper() else c for c in var[1]).strip('_')
 977                 out_java_trait += "\tpublic " + var[1] + " get_" + underscore_name + "() {\n"
 978                 out_java_trait += "\t\t" + var[1] + " res = new " + var[1] + "(null, bindings." + struct_name + "_get_" + var[1] + "(this.ptr));\n"
 979                 out_java_trait += "\t\tthis.ptrs_to.add(res);\n"
 980                 out_java_trait += "\t\treturn res;\n"
 981                 out_java_trait += "\t}\n"
 982                 out_java_trait += "\n"
 983
 984                 out_java += "\tpublic static native long " + struct_name + "_get_" + var[1] + "(long arg);\n"
 985
 986                 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"
 987                 out_c += "\t" + struct_name + " *inp = (" + struct_name + " *)(arg & ~1);\n"
 988                 out_c += "\tuint64_t res_ptr = (uint64_t)&inp->" + var[1] + ";\n"
 989                 out_c += "\tDO_ASSERT((res_ptr & 1) == 0);\n"
 990                 out_c += "\treturn (int64_t)(res_ptr | 1);\n"
 991                 out_c += "}\n"
 992
 993         return (out_java, out_java_trait, out_c)
 994
 995     def trait_struct_inc_refcnt(self, ty_info):
 996         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 997         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 998         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_cloned(&" + ty_info.var_name + "_conv);\n}"
 999         return base_conv
1000
1001     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
1002         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
1003         out_java_enum = ""
1004         out_java = ""
1005         out_c = ""
1006
1007         out_java_enum += (self.hu_struct_file_prefix)
1008         out_java_enum += "\n/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
1009         out_java_enum += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
1010         out_java_enum += ("public class " + java_hu_type + " extends CommonBase {\n")
1011         out_java_enum += ("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
1012         out_java_enum += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
1013         out_java_enum += ("\tprotected void finalize() throws Throwable {\n")
1014         out_java_enum += ("\t\tsuper.finalize();\n")
1015         out_java_enum += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK", "") + "_free(ptr); }\n")
1016         out_java_enum += ("\t}\n")
1017         out_java_enum += ("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
1018         out_java_enum += ("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
1019         java_hu_subclasses = ""
1020
1021         init_meth_jty_strs = {}
1022
1023         out_java +=  ("\tpublic static class " + struct_name + " {\n")
1024         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
1025         for var in variant_list:
1026             out_java +=  ("\t\tpublic final static class " + var.var_name + " extends " + struct_name + " {\n")
1027             java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var.var_name + " extends " + java_hu_type + " {\n"
1028             out_java_enum += ("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var.var_name + ".class) {\n")
1029             out_java_enum += ("\t\t\treturn new " + var.var_name + "(ptr, (bindings." + struct_name + "." + var.var_name + ")raw_val);\n")
1030             init_meth_jty_str = ""
1031             init_meth_params = ""
1032             init_meth_body = ""
1033             hu_conv_body = ""
1034             for idx, (field_ty, field_docs) in enumerate(var.fields):
1035                 if idx > 0:
1036                     init_meth_params = init_meth_params + ", "
1037
1038                 if field_ty.java_hu_ty == var.var_name:
1039                     field_path = field_ty.java_fn_ty_arg.strip("L;").replace("/", ".")
1040                     out_java += "\t\t\tpublic " + field_path + " " + field_ty.arg_name + ";\n"
1041                     java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_path + " " + field_ty.arg_name + ";\n"
1042                     init_meth_params = init_meth_params + field_path + " " + field_ty.arg_name
1043                 else:
1044                     out_java += "\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n"
1045                     if field_docs is not None:
1046                         java_hu_subclasses += "\t\t/**\n\t\t * " + field_docs.replace("\n", "\n\t\t * ") + "\n\t\t*/\n"
1047                     java_hu_subclasses += "\t\t"
1048                     if field_ty.nullable:
1049                         java_hu_subclasses += "@Nullable "
1050                     java_hu_subclasses += "public final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
1051                     init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
1052                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
1053                 if field_ty.to_hu_conv is not None:
1054                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1055                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1056                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1057                 else:
1058                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1059                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
1060             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
1061             out_java +=  (init_meth_body)
1062             out_java +=  ("}\n")
1063             out_java += ("\t\t}\n")
1064             out_java_enum += ("\t\t}\n")
1065             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"
1066             java_hu_subclasses = java_hu_subclasses + hu_conv_body
1067             java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
1068             init_meth_jty_strs[var.var_name] = init_meth_jty_str
1069         out_java += ("\t\tstatic native void init();\n")
1070         out_java += ("\t}\n")
1071         out_java_enum += ("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
1072         out_java_enum += (java_hu_subclasses)
1073         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
1074         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
1075
1076         out_c += (self.c_complex_enum_pfx(struct_name, [x.var_name for x in variant_list], init_meth_jty_strs))
1077
1078         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")
1079         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n")
1080         out_c += ("\tswitch(obj->tag) {\n")
1081         for var in variant_list:
1082             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
1083             c_params = []
1084             for idx, (field_map, field_docs) in enumerate(var.fields):
1085                 if field_map.ret_conv is not None:
1086                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1087                     if var.tuple_variant:
1088                         out_c += "obj->" + camel_to_snake(var.var_name)
1089                     else:
1090                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
1091                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1092                     c_params.append(field_map.ret_conv_name)
1093                 else:
1094                     if var.tuple_variant:
1095                         c_params.append("obj->" + camel_to_snake(var.var_name))
1096                     else:
1097                         c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
1098             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
1099             out_c += ("\t\t}\n")
1100         out_c += ("\t\tdefault: abort();\n")
1101         out_c += ("\t}\n}\n")
1102         return (out_java, out_java_enum, out_c)
1103
1104     def map_opaque_struct(self, struct_name, struct_doc_comment):
1105         out_opaque_struct_human = ""
1106         out_opaque_struct_human += self.hu_struct_file_prefix
1107         out_opaque_struct_human += "\n/**\n * " + struct_doc_comment.replace("\n", "\n * ") + "\n */\n"
1108         out_opaque_struct_human += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
1109         out_opaque_struct_human += ("public class " + struct_name.replace("LDK","") + " extends CommonBase")
1110         if struct_name.startswith("LDKLocked"):
1111             out_opaque_struct_human += (" implements AutoCloseable")
1112         out_opaque_struct_human += (" {\n")
1113         out_opaque_struct_human += ("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
1114         if struct_name.startswith("LDKLocked"):
1115             out_opaque_struct_human += ("\t@Override public void close() {\n")
1116         else:
1117             out_opaque_struct_human += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
1118             out_opaque_struct_human += ("\tprotected void finalize() throws Throwable {\n")
1119             out_opaque_struct_human += ("\t\tsuper.finalize();\n")
1120         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
1121         out_opaque_struct_human += ("\t}\n\n")
1122         return out_opaque_struct_human
1123
1124
1125     def map_function(self, argument_types, c_call_string, method_name, return_type_info, struct_meth, default_constructor_args, takes_self, takes_self_as_ref, args_known, type_mapping_generator, doc_comment):
1126         out_java = ""
1127         out_c = ""
1128         out_java_struct = None
1129
1130         out_java += ("\tpublic static native ")
1131         out_c += (self.c_fn_ty_pfx)
1132         out_c += (return_type_info.c_ty)
1133         out_java += (return_type_info.java_ty)
1134         if return_type_info.ret_conv is not None:
1135             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1136         out_java += (" " + method_name + "(")
1137         have_args = len(argument_types) > 1 or (len(argument_types) > 0 and argument_types[0].c_ty != "void")
1138         out_c += (" " + self.c_fn_name_define_pfx(method_name, have_args))
1139
1140         for idx, arg_conv_info in enumerate(argument_types):
1141             if idx != 0:
1142                 out_java += (", ")
1143                 out_c += (", ")
1144             if arg_conv_info.c_ty != "void":
1145                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1146                 out_java += (arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
1147
1148         out_java_struct = ""
1149         if not args_known:
1150             out_java_struct += ("\t// Skipped " + method_name + "\n")
1151         else:
1152             meth_n = method_name[len(struct_meth) + 1 if len(struct_meth) != 0 else 0:].strip("_")
1153             if doc_comment is not None:
1154                 out_java_struct += "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
1155             if return_type_info.nullable:
1156                 out_java_struct += "\t@Nullable\n"
1157             if not takes_self:
1158                 if meth_n == "new":
1159                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " of("
1160                 elif meth_n == "default":
1161                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " with_default("
1162                 else:
1163                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " " + meth_n + "("
1164             else:
1165                 out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
1166             for idx, arg in enumerate(argument_types):
1167                 if idx != 0:
1168                     if not takes_self or idx > 1:
1169                         out_java_struct += ", "
1170                 elif takes_self:
1171                     continue
1172                 if arg.java_ty != "void":
1173                     if arg.arg_name in default_constructor_args:
1174                         assert not arg.nullable
1175                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1176                             if explode_idx != 0:
1177                                 out_java_struct += (", ")
1178                             out_java_struct += (
1179                                 explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
1180                     else:
1181                         if arg.nullable:
1182                             out_java_struct += "@Nullable "
1183                         ty_string = arg.java_hu_ty
1184                         if arg.java_fn_ty_arg[0] == "L" and arg.java_fn_ty_arg[len(arg.java_fn_ty_arg) - 1] == ";":
1185                             ty_string = arg.java_fn_ty_arg.strip("L;").replace("/", ".")
1186                         out_java_struct += ty_string + " " + arg.arg_name
1187         out_java += (");\n")
1188         out_c += (") {\n")
1189         if out_java_struct is not None:
1190             out_java_struct += (") {\n")
1191         for info in argument_types:
1192             if info.arg_conv is not None:
1193                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1194         if return_type_info.ret_conv is not None:
1195             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1196         elif return_type_info.c_ty != "void":
1197             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1198         else:
1199             out_c += ("\t")
1200         if c_call_string is None:
1201             out_c += (method_name + "(")
1202         else:
1203             out_c += (c_call_string)
1204         for idx, info in enumerate(argument_types):
1205             if info.arg_conv_name is not None:
1206                 if idx != 0:
1207                     out_c += (", ")
1208                 elif c_call_string is not None:
1209                     continue
1210                 out_c += (info.arg_conv_name)
1211         out_c += (")")
1212         if return_type_info.ret_conv is not None:
1213             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1214         else:
1215             out_c += (";")
1216         for info in argument_types:
1217             if info.arg_conv_cleanup is not None:
1218                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1219         if return_type_info.ret_conv is not None:
1220             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1221         elif return_type_info.c_ty != "void":
1222             out_c += ("\n\treturn ret_val;")
1223         out_c += ("\n}\n\n")
1224
1225         if args_known:
1226             out_java_struct += ("\t\t")
1227             if return_type_info.java_ty != "void":
1228                 out_java_struct += (return_type_info.java_ty + " ret = ")
1229             out_java_struct += ("bindings." + method_name + "(")
1230             for idx, info in enumerate(argument_types):
1231                 if idx != 0:
1232                     out_java_struct += (", ")
1233                 if idx == 0 and takes_self:
1234                     out_java_struct += ("this.ptr")
1235                 elif info.arg_name in default_constructor_args:
1236                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1237                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1238                         if explode_idx != 0:
1239                             out_java_struct += (", ")
1240                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1241                         if explode_arg.from_hu_conv is not None:
1242                             out_java_struct += (
1243                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1244                         else:
1245                             out_java_struct += (expl_arg_name)
1246                     out_java_struct += (")")
1247                 elif info.from_hu_conv is not None:
1248                     out_java_struct += (info.from_hu_conv[0])
1249                 else:
1250                     out_java_struct += (info.arg_name)
1251             out_java_struct += (");\n")
1252             if return_type_info.java_ty == "long" and return_type_info.java_hu_ty != "long":
1253                 out_java_struct += "\t\tif (ret < 1024) { return null; }\n"
1254
1255             if return_type_info.to_hu_conv is not None:
1256                 if not takes_self:
1257                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1258                                                                                                                return_type_info.to_hu_conv_name) + "\n")
1259                 else:
1260                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1261
1262             for idx, info in enumerate(argument_types):
1263                 if idx == 0 and takes_self:
1264                     pass
1265                 elif info.arg_name in default_constructor_args:
1266                     for explode_arg in default_constructor_args[info.arg_name]:
1267                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1268                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1269                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1270                                                                                                expl_arg_name).replace(
1271                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1272                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1273                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1274                         out_java_struct += (
1275                             "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1276                     else:
1277                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1278
1279             if takes_self and not takes_self_as_ref:
1280                 out_java_struct += "\t\t" + argument_types[0].from_hu_conv[1].replace("\n", "\n\t\t").replace("this_arg", "this") + ";\n"
1281             if return_type_info.to_hu_conv_name is not None:
1282                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1283             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1284                 out_java_struct += ("\t\treturn ret;\n")
1285             out_java_struct += ("\t}\n\n")
1286
1287         return (out_java, out_c, out_java_struct)