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

   1 from bindingstypes import *
   2 from enum import Enum
   3 import sys
   4
   5 class Target(Enum):
   6     JAVA = 1,
   7     ANDROID = 2
   8
   9 class Consts:
  10     def __init__(self, DEBUG: bool, target: Target, **kwargs):
  11         self.target = target
  12         self.c_array_class_caches = set()
  13         self.c_type_map = dict(
  14             uint8_t = ['byte'],
  15             uint16_t = ['short'],
  16             uint32_t = ['int'],
  17             uint64_t = ['long'],
  18         )
  19
  20         self.to_hu_conv_templates = dict(
  21             ptr = '{human_type} {var_name}_hu_conv = new {human_type}(null, {var_name});',
  22             default = '{human_type} {var_name}_hu_conv = new {human_type}(null, {var_name});'
  23         )
  24
  25         self.bindings_header = """package org.ldk.impl;
  26 import org.ldk.enums.*;
  27 import java.io.File;
  28 import java.io.InputStream;
  29 import java.io.IOException;
  30 import java.nio.file.Files;
  31 import java.nio.file.Path;
  32 import java.nio.file.StandardCopyOption;
  33
  34 public class bindings {
  35         public static class VecOrSliceDef {
  36                 public long dataptr;
  37                 public long datalen;
  38                 public long stride;
  39                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
  40                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
  41                 }
  42         }
  43         static {
  44                 try {
  45                         // Try to load natively first, this works on Android and in testing.
  46                         System.loadLibrary(\"lightningjni\");
  47                 } catch (UnsatisfiedLinkError _ignored) {
  48                         // Otherwise try to load from the library jar.
  49                         File tmpdir = new File(System.getProperty("java.io.tmpdir"), "ldk-java-nativelib");
  50                         tmpdir.mkdir(); // If it fails to create, assume it was there already
  51                         tmpdir.deleteOnExit();
  52                         String libname = "liblightningjni_" + System.getProperty("os.name").replaceAll(" ", "") +
  53                                 "-" + System.getProperty("os.arch").replaceAll(" ", "") + ".nativelib";
  54                         try (InputStream is = bindings.class.getResourceAsStream("/" + libname)) {
  55                                 Path libpath = new File(tmpdir.toPath().toString(), "liblightningjni.so").toPath();
  56                                 Files.copy(is, libpath, StandardCopyOption.REPLACE_EXISTING);
  57                                 Runtime.getRuntime().load(libpath.toString());
  58                         } catch (IOException e) {
  59                                 throw new IllegalArgumentException(e);
  60                         }
  61                 }
  62                 init(java.lang.Enum.class, VecOrSliceDef.class);
  63                 init_class_cache();
  64                 if (!get_lib_version_string().equals(get_ldk_java_bindings_version()))
  65                         throw new IllegalArgumentException("Compiled LDK library and LDK class failes do not match");
  66                 // Fetching the LDK versions from C also checks that the header and binaries match
  67                 get_ldk_c_bindings_version();
  68                 get_ldk_version();
  69         }
  70         static native void init(java.lang.Class c, java.lang.Class slicedef);
  71         static native void init_class_cache();
  72         static native String get_lib_version_string();
  73
  74         public static String get_ldk_java_bindings_version() {
  75                 return "<git_version_ldk_garbagecollected>";
  76         }
  77         public static native String get_ldk_c_bindings_version();
  78         public static native String get_ldk_version();
  79
  80         public static native boolean deref_bool(long ptr);
  81         public static native long deref_long(long ptr);
  82         public static native void free_heap_ptr(long ptr);
  83         public static native byte[] read_bytes(long ptr, long len);
  84         public static native byte[] get_u8_slice_bytes(long slice_ptr);
  85         public static native long bytes_to_u8_vec(byte[] bytes);
  86         public static native long new_txpointer_copy_data(byte[] txdata);
  87         public static native void txpointer_free(long ptr);
  88         public static native byte[] txpointer_get_buffer(long ptr);
  89         public static native long vec_slice_len(long vec);
  90         public static native long new_empty_slice_vec();
  91
  92 """
  93
  94         self.bindings_footer = "}\n"
  95
  96         self.util_fn_pfx = """package org.ldk.structs;
  97 import org.ldk.impl.bindings;
  98 import java.util.Arrays;
  99 import javax.annotation.Nullable;
 100 import org.ldk.enums.*;
 101
 102 public class UtilMethods {
 103 """
 104         self.util_fn_sfx = "}"
 105         self.common_base = """package org.ldk.structs;
 106 import java.util.LinkedList;
 107 class CommonBase {
 108         long ptr;
 109         LinkedList<Object> ptrs_to = new LinkedList();
 110         protected CommonBase(long ptr) { assert ptr > 1024; this.ptr = ptr; }
 111 }
 112 """
 113
 114         self.c_file_pfx = """#include <jni.h>
 115 // On OSX jlong (ie long long) is not equivalent to int64_t, so we override here
 116 #define int64_t jlong
 117 #include \"org_ldk_impl_bindings.h\"
 118 #include <lightning.h>
 119 #include <string.h>
 120 #include <stdatomic.h>
 121 #include <stdlib.h>
 122
 123 """
 124
 125         if self.target == Target.ANDROID:
 126             self.c_file_pfx = self.c_file_pfx + """
 127 #include <android/log.h>
 128 #define DEBUG_PRINT(...) __android_log_print(ANDROID_LOG_ERROR, "LDK", __VA_ARGS__)
 129
 130 #include <unistd.h>
 131 #include <pthread.h>
 132 static void* redirect_stderr(void* ignored) {
 133         int pipes[2];
 134         pipe(pipes);
 135         dup2(pipes[1], STDERR_FILENO);
 136         char buf[8192];
 137         memset(buf, 0, 8192);
 138         ssize_t len;
 139         while ((len = read(pipes[0], buf, 8191)) > 0) {
 140                 DEBUG_PRINT("%s\\n", buf);
 141                 memset(buf, 0, 8192);
 142         }
 143         DEBUG_PRINT("End of stderr???\\n");
 144         return 0;
 145 }
 146 void __attribute__((constructor)) spawn_stderr_redirection() {
 147         pthread_t thread;
 148         pthread_create(&thread, NULL, &redirect_stderr, NULL);
 149 }
 150 """
 151         else:
 152             self.c_file_pfx = self.c_file_pfx + "#define DEBUG_PRINT(...) fprintf(stderr, __VA_ARGS__)\n"
 153
 154         if not DEBUG or sys.platform == "darwin":
 155             self.c_file_pfx = self.c_file_pfx + """#define MALLOC(a, _) malloc(a)
 156 #define FREE(p) if ((uint64_t)(p) > 1024) { free(p); }
 157 """
 158         if not DEBUG:
 159             self.c_file_pfx += """#define DO_ASSERT(a) (void)(a)
 160 #define CHECK(a)
 161 """
 162         if DEBUG:
 163             self.c_file_pfx = self.c_file_pfx + """#include <assert.h>
 164 // Always run a, then assert it is true:
 165 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 166 // Assert a is true or do nothing
 167 #define CHECK(a) DO_ASSERT(a)
 168
 169 void __attribute__((constructor)) debug_log_version() {
 170         if (check_get_ldk_version() == NULL)
 171                 DEBUG_PRINT("LDK version did not match the header we built against\\n");
 172         if (check_get_ldk_bindings_version() == NULL)
 173                 DEBUG_PRINT("LDK C Bindings version did not match the header we built against\\n");
 174         DEBUG_PRINT("Loaded LDK-Java Bindings with LDK %s and LDK-C-Bindings %s\\n", check_get_ldk_version(), check_get_ldk_bindings_version());
 175 }
 176 """
 177
 178             if sys.platform != "darwin":
 179                 self.c_file_pfx += """
 180 // Running a leak check across all the allocations and frees of the JDK is a mess,
 181 // so instead we implement our own naive leak checker here, relying on the -wrap
 182 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 183 // and free'd in Rust or C across the generated bindings shared library.
 184 #include <threads.h>
 185 """
 186
 187                 if self.target == Target.ANDROID:
 188                     self.c_file_pfx = self.c_file_pfx + """
 189 #include <unwind.h>
 190 #include <dlfcn.h>
 191
 192 // Implement the execinfo functions using _Unwind_backtrace. This seems to miss many Rust
 193 // symbols, so we only use it on Android, where execinfo.h is unavailable.
 194
 195 struct BacktraceState {
 196         void** current;
 197         void** end;
 198 };
 199 static _Unwind_Reason_Code unwind_callback(struct _Unwind_Context* context, void* arg) {
 200         struct BacktraceState* state = (struct BacktraceState*)arg;
 201         uintptr_t pc = _Unwind_GetIP(context);
 202         if (pc) {
 203                 if (state->current == state->end) {
 204                         return _URC_END_OF_STACK;
 205                 } else {
 206                         *state->current++ = (void*)(pc);
 207                 }
 208         }
 209         return _URC_NO_REASON;
 210 }
 211
 212 int backtrace(void** buffer, int max) {
 213         struct BacktraceState state = { buffer, buffer + max };
 214         _Unwind_Backtrace(unwind_callback, &state);
 215         return state.current - buffer;
 216 }
 217
 218 void backtrace_symbols_fd(void ** buffer, int count, int _fd) {
 219         for (int idx = 0; idx < count; ++idx) {
 220                 Dl_info info;
 221                 if (dladdr(buffer[idx], &info) && info.dli_sname) {
 222                         DEBUG_PRINT("%p: %s", buffer[idx], info.dli_sname);
 223                 } else {
 224                         DEBUG_PRINT("%p: ???", buffer[idx]);
 225                 }
 226         }
 227 }
 228 """
 229                 else:
 230                     self.c_file_pfx = self.c_file_pfx + "#include <execinfo.h>\n"
 231                 self.c_file_pfx = self.c_file_pfx + """
 232 #include <unistd.h>
 233 static mtx_t allocation_mtx;
 234
 235 void __attribute__((constructor)) init_mtx() {
 236         DO_ASSERT(mtx_init(&allocation_mtx, mtx_plain) == thrd_success);
 237 }
 238
 239 #define BT_MAX 128
 240 typedef struct allocation {
 241         struct allocation* next;
 242         void* ptr;
 243         const char* struct_name;
 244         void* bt[BT_MAX];
 245         int bt_len;
 246         unsigned long alloc_len;
 247 } allocation;
 248 static allocation* allocation_ll = NULL;
 249
 250 void* __real_malloc(size_t len);
 251 void* __real_calloc(size_t nmemb, size_t len);
 252 static void new_allocation(void* res, const char* struct_name, size_t len) {
 253         allocation* new_alloc = __real_malloc(sizeof(allocation));
 254         new_alloc->ptr = res;
 255         new_alloc->struct_name = struct_name;
 256         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 257         new_alloc->alloc_len = len;
 258         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 259         new_alloc->next = allocation_ll;
 260         allocation_ll = new_alloc;
 261         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 262 }
 263 static void* MALLOC(size_t len, const char* struct_name) {
 264         void* res = __real_malloc(len);
 265         new_allocation(res, struct_name, len);
 266         return res;
 267 }
 268 void __real_free(void* ptr);
 269 static void alloc_freed(void* ptr) {
 270         allocation* p = NULL;
 271         DO_ASSERT(mtx_lock(&allocation_mtx) == thrd_success);
 272         allocation* it = allocation_ll;
 273         while (it->ptr != ptr) {
 274                 p = it; it = it->next;
 275                 if (it == NULL) {
 276                         DEBUG_PRINT("Tried to free unknown pointer %p at:\\n", ptr);
 277                         void* bt[BT_MAX];
 278                         int bt_len = backtrace(bt, BT_MAX);
 279                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 280                         DEBUG_PRINT("\\n\\n");
 281                         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 282                         return; // addrsan should catch malloc-unknown and print more info than we have
 283                 }
 284         }
 285         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 286         DO_ASSERT(mtx_unlock(&allocation_mtx) == thrd_success);
 287         DO_ASSERT(it->ptr == ptr);
 288         __real_free(it);
 289 }
 290 static void FREE(void* ptr) {
 291         if ((uint64_t)ptr < 1024) return; // Rust loves to create pointers to the NULL page for dummys
 292         alloc_freed(ptr);
 293         __real_free(ptr);
 294 }
 295
 296 void* __wrap_malloc(size_t len) {
 297         void* res = __real_malloc(len);
 298         new_allocation(res, "malloc call", len);
 299         return res;
 300 }
 301 void* __wrap_calloc(size_t nmemb, size_t len) {
 302         void* res = __real_calloc(nmemb, len);
 303         new_allocation(res, "calloc call", len);
 304         return res;
 305 }
 306 void __wrap_free(void* ptr) {
 307         if (ptr == NULL) return;
 308         alloc_freed(ptr);
 309         __real_free(ptr);
 310 }
 311
 312 void* __real_realloc(void* ptr, size_t newlen);
 313 void* __wrap_realloc(void* ptr, size_t len) {
 314         if (ptr != NULL) alloc_freed(ptr);
 315         void* res = __real_realloc(ptr, len);
 316         new_allocation(res, "realloc call", len);
 317         return res;
 318 }
 319 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 320         // Rust doesn't seem to use reallocarray currently
 321         DO_ASSERT(false);
 322 }
 323
 324 void __attribute__((destructor)) check_leaks() {
 325         unsigned long alloc_count = 0;
 326         unsigned long alloc_size = 0;
 327         DEBUG_PRINT("The following LDK-allocated blocks still remain.\\n");
 328         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 329         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 330         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 331                 DEBUG_PRINT("%s %p (%lu bytes) remains:\\n", a->struct_name, a->ptr, a->alloc_len);
 332                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 333                 DEBUG_PRINT("\\n\\n");
 334                 alloc_count++;
 335                 alloc_size += a->alloc_len;
 336         }
 337         DEBUG_PRINT("%lu allocations remained for %lu bytes.\\n", alloc_count, alloc_size);
 338         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 339         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 340 }
 341 """
 342         self.c_file_pfx = self.c_file_pfx + """
 343 static jmethodID ordinal_meth = NULL;
 344 static jmethodID slicedef_meth = NULL;
 345 static jclass slicedef_cls = NULL;
 346 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 347         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 348         CHECK(ordinal_meth != NULL);
 349         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 350         CHECK(slicedef_meth != NULL);
 351         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 352         CHECK(slicedef_cls != NULL);
 353 }
 354
 355 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 356         return *((bool*)ptr);
 357 }
 358 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 359         return *((long*)ptr);
 360 }
 361 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 362         FREE((void*)ptr);
 363 }
 364 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * env, jclass _b, jlong ptr, jlong len) {
 365         jbyteArray ret_arr = (*env)->NewByteArray(env, len);
 366         (*env)->SetByteArrayRegion(env, ret_arr, 0, len, (unsigned char*)ptr);
 367         return ret_arr;
 368 }
 369 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * env, jclass _b, jlong slice_ptr) {
 370         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 371         jbyteArray ret_arr = (*env)->NewByteArray(env, slice->datalen);
 372         (*env)->SetByteArrayRegion(env, ret_arr, 0, slice->datalen, slice->data);
 373         return ret_arr;
 374 }
 375 JNIEXPORT int64_t impl_bindings_bytes_1to_1u8_1vec (JNIEnv * env, jclass _b, jbyteArray bytes) {
 376         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 377         vec->datalen = (*env)->GetArrayLength(env, bytes);
 378         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 379         (*env)->GetByteArrayRegion (env, bytes, 0, vec->datalen, vec->data);
 380         return (uint64_t)vec;
 381 }
 382 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_txpointer_1get_1buffer (JNIEnv * env, jclass _b, jlong ptr) {
 383         LDKTransaction *txdata = (LDKTransaction*)ptr;
 384         LDKu8slice slice;
 385         slice.data = txdata->data;
 386         slice.datalen = txdata->datalen;
 387         return Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes(env, _b, (uint64_t)&slice);
 388 }
 389 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 390         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 391         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 392         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 393         txdata->data_is_owned = false;
 394         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
 395         return (uint64_t)txdata;
 396 }
 397 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_txpointer_1free (JNIEnv * env, jclass _b, jlong ptr) {
 398         LDKTransaction *tx = (LDKTransaction*)ptr;
 399         tx->data_is_owned = true;
 400         Transaction_free(*tx);
 401         FREE((void*)ptr);
 402 }
 403 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 404         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 405         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
 406         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
 407         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
 408         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
 409         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 410         return (uint64_t)vec->datalen;
 411 }
 412 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * env, jclass _b) {
 413         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
 414         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
 415         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
 416         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
 417         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
 418         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
 419         vec->data = NULL;
 420         vec->datalen = 0;
 421         return (uint64_t)vec;
 422 }
 423
 424 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 425 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 426 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 427 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 428
 429 _Static_assert(sizeof(jlong) == sizeof(int64_t), "We assume that j-types are the same as C types");
 430 _Static_assert(sizeof(jbyte) == sizeof(char), "We assume that j-types are the same as C types");
 431 _Static_assert(sizeof(void*) <= 8, "Pointers must fit into 64 bits");
 432
 433 typedef jlongArray int64_tArray;
 434 typedef jbyteArray int8_tArray;
 435
 436 static inline jstring str_ref_to_java(JNIEnv *env, const char* chars, size_t len) {
 437         // Sadly we need to create a temporary because Java can't accept a char* without a 0-terminator
 438         char* conv_buf = MALLOC(len + 1, "str conv buf");
 439         memcpy(conv_buf, chars, len);
 440         conv_buf[len] = 0;
 441         jstring ret = (*env)->NewStringUTF(env, conv_buf);
 442         FREE(conv_buf);
 443         return ret;
 444 }
 445 static inline LDKStr java_to_owned_str(JNIEnv *env, jstring str) {
 446         uint64_t str_len = (*env)->GetStringUTFLength(env, str);
 447         char* newchars = MALLOC(str_len + 1, "String chars");
 448         const char* jchars = (*env)->GetStringUTFChars(env, str, NULL);
 449         memcpy(newchars, jchars, str_len);
 450         newchars[str_len] = 0;
 451         (*env)->ReleaseStringUTFChars(env, str, jchars);
 452         LDKStr res = {
 453                 .chars = newchars,
 454                 .len = str_len,
 455                 .chars_is_owned = true
 456         };
 457         return res;
 458 }
 459
 460 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1lib_1version_1string(JNIEnv *env, jclass _c) {
 461         return str_ref_to_java(env, "<git_version_ldk_garbagecollected>", strlen("<git_version_ldk_garbagecollected>"));
 462 }
 463 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1ldk_1c_1bindings_1version(JNIEnv *env, jclass _c) {
 464         return str_ref_to_java(env, check_get_ldk_bindings_version(), strlen(check_get_ldk_bindings_version()));
 465 }
 466 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1ldk_1version(JNIEnv *env, jclass _c) {
 467         return str_ref_to_java(env, check_get_ldk_version(), strlen(check_get_ldk_version()));
 468 }
 469 """
 470
 471         self.hu_struct_file_prefix = """package org.ldk.structs;
 472
 473 import org.ldk.impl.bindings;
 474 import org.ldk.enums.*;
 475 import org.ldk.util.*;
 476 import java.util.Arrays;
 477 import javax.annotation.Nullable;
 478
 479 """
 480         self.c_fn_ty_pfx = "JNIEXPORT "
 481         self.c_fn_args_pfx = "JNIEnv *env, jclass clz"
 482         self.file_ext = ".java"
 483         self.ptr_c_ty = "int64_t"
 484         self.ptr_native_ty = "long"
 485         self.result_c_ty = "jclass"
 486         self.ptr_arr = "jobjectArray"
 487         self.is_arr_some_check = ("", " != NULL")
 488         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 489
 490     def construct_jenv(self):
 491         res =  "JNIEnv *env;\n"
 492         res += "jint get_jenv_res = (*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_6);\n"
 493         res += "if (get_jenv_res == JNI_EDETACHED) {\n"
 494         if self.target == Target.ANDROID:
 495             res += "\tDO_ASSERT((*j_calls->vm)->AttachCurrentThread(j_calls->vm, &env, NULL) == JNI_OK);\n"
 496         else:
 497             res += "\tDO_ASSERT((*j_calls->vm)->AttachCurrentThread(j_calls->vm, (void**)&env, NULL) == JNI_OK);\n"
 498         res += "} else {\n"
 499         res += "\tDO_ASSERT(get_jenv_res == JNI_OK);\n"
 500         res += "}\n"
 501         return res
 502     def deconstruct_jenv(self):
 503         res = "if (get_jenv_res == JNI_EDETACHED) {\n"
 504         res += "\tDO_ASSERT((*j_calls->vm)->DetachCurrentThread(j_calls->vm) == JNI_OK);\n"
 505         res += "}\n"
 506         return res
 507
 508     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 509         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 510             return "(*env)->ReleasePrimitiveArrayCritical(env, " + arr_var + ", " + arr_ptr_var + ", 0)"
 511         return None
 512     def create_native_arr_call(self, arr_len, ty_info):
 513         if ty_info.c_ty == "int8_tArray":
 514             return "(*env)->NewByteArray(env, " + arr_len + ")"
 515         elif ty_info.subty.c_ty.endswith("Array"):
 516             clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 517             self.c_array_class_caches.add(clz_var)
 518             return "(*env)->NewObjectArray(env, " + arr_len + ", " + clz_var + "_clz, NULL);\n"
 519         else:
 520             return "(*env)->New" + ty_info.java_ty.strip("[]").title() + "Array(env, " + arr_len + ")"
 521     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 522         if ty_info.c_ty == "int8_tArray":
 523             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 524         else:
 525             assert False
 526     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 527         if ty_info.c_ty == "int8_tArray":
 528             if copy:
 529                 return "(*env)->GetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", " + dest_name + ")"
 530             else:
 531                 return "(*env)->GetByteArrayElements (env, " + arr_name + ", NULL)"
 532         elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 533             return "(*env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (env, " + arr_name + ", NULL)"
 534         else:
 535             return None
 536     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 537         if self.get_native_arr_contents(arr_name, "", "", ty_info, False) is None:
 538             return "(*env)->GetObjectArrayElement(env, " + arr_name + ", " + idxc + ")"
 539         else:
 540             assert False # Only called if above is None
 541     def get_native_arr_ptr_call(self, ty_info):
 542         if ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"):
 543             return None
 544         return ("(*env)->GetPrimitiveArrayCritical(env, ", ", NULL)")
 545     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 546         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 547             return None
 548         return "(*env)->SetObjectArrayElement(env, " + arr_name + ", " + idxc + ", " + entry_access + ")"
 549     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 550         if ty_info.c_ty == "int8_tArray":
 551             return "(*env)->ReleaseByteArrayElements(env, " + arr_name + ", (int8_t*)" + dest_name + ", 0);"
 552         else:
 553             return "(*env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements(env, " + arr_name + ", " + dest_name + ", 0)"
 554
 555     def str_ref_to_native_call(self, var_name, str_len):
 556         return "str_ref_to_java(env, " + var_name + ", " + str_len + ")"
 557     def str_ref_to_c_call(self, var_name):
 558         return "java_to_owned_str(env, " + var_name + ")"
 559
 560     def c_fn_name_define_pfx(self, fn_name, has_args):
 561         if has_args:
 562             return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz, "
 563         return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz"
 564
 565     def init_str(self):
 566         res = ""
 567         for ty in sorted(self.c_array_class_caches):
 568             res = res + "static jclass " + ty + "_clz = NULL;\n"
 569         res = res + "JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass clz) {\n"
 570         for ty in sorted(self.c_array_class_caches):
 571             res = res + "\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n"
 572             res = res + "\tCHECK(" + ty + "_clz != NULL);\n"
 573             res = res + "\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n"
 574         res = res + "}\n"
 575         return res
 576
 577     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 578         out_java_enum = "package org.ldk.enums;\n\n"
 579         out_java = ""
 580         out_c = ""
 581         out_c = out_c + "static inline LDK" + struct_name + " LDK" + struct_name + "_from_java(" + self.c_fn_args_pfx + ") {\n"
 582         out_c = out_c + "\tswitch ((*env)->CallIntMethod(env, clz, ordinal_meth)) {\n"
 583
 584         if enum_doc_comment is not None:
 585             out_java_enum += "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
 586         out_java_enum += "public enum " + struct_name + " {\n"
 587         ord_v = 0
 588         for var in variants:
 589             out_java_enum = out_java_enum + "\t" + var + ",\n"
 590             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 591             ord_v = ord_v + 1
 592         out_java_enum = out_java_enum + "\t; static native void init();\n"
 593         out_java_enum = out_java_enum + "\tstatic { init(); }\n"
 594         out_java_enum = out_java_enum + "}"
 595         out_java = out_java + "\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n"
 596         out_c = out_c + "\t}\n"
 597         out_c = out_c + "\tabort();\n"
 598         out_c = out_c + "}\n"
 599
 600         out_c = out_c + "static jclass " + struct_name + "_class = NULL;\n"
 601         for var in variants:
 602             out_c = out_c + "static jfieldID " + struct_name + "_" + var + " = NULL;\n"
 603         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"
 604         out_c = out_c + "\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n"
 605         out_c = out_c + "\tCHECK(" + struct_name + "_class != NULL);\n"
 606         for var in variants:
 607             out_c = out_c + "\t" + struct_name + "_" + var + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + var + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n"
 608             out_c = out_c + "\tCHECK(" + struct_name + "_" + var + " != NULL);\n"
 609         out_c = out_c + "}\n"
 610         out_c = out_c + "static inline jclass LDK" + struct_name + "_to_java(JNIEnv *env, LDK" + struct_name + " val) {\n"
 611         out_c = out_c + "\tswitch (val) {\n"
 612         ord_v = 0
 613         for var in variants:
 614             out_c = out_c + "\t\tcase " + var + ":\n"
 615             out_c = out_c + "\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + var + ");\n"
 616             ord_v = ord_v + 1
 617         out_c = out_c + "\t\tdefault: abort();\n"
 618         out_c = out_c + "\t}\n"
 619         out_c = out_c + "}\n\n"
 620
 621         return (out_c, out_java_enum, out_java)
 622
 623     def c_unitary_enum_to_native_call(self, ty_info):
 624         return (ty_info.rust_obj + "_to_java(env, ", ")")
 625     def native_unitary_enum_to_c_call(self, ty_info):
 626         return (ty_info.rust_obj + "_from_java(env, ", ")")
 627
 628     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 629         out_c = ""
 630         for var in variants:
 631             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 632             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 633         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"
 634         for var_name in variants:
 635             out_c = out_c + "\t" + struct_name + "_" + var_name + "_class =\n"
 636             if self.target == Target.ANDROID:
 637                 out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"org/ldk/impl/bindings$" + struct_name + "$" + var_name + "\"));\n"
 638             else:
 639                 out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n"
 640             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 641             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"
 642             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 643         out_c = out_c + "}\n"
 644         return out_c
 645
 646     def c_complex_enum_pass_ty(self, struct_name):
 647         return "jobject"
 648
 649     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 650         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 651         for param in c_params:
 652             ret = ret + ", " + param
 653         return ret + ")"
 654
 655     def native_c_map_trait(self, struct_name, field_vars, flattened_field_vars, field_fns, trait_doc_comment):
 656         out_java_trait = ""
 657         out_java = ""
 658
 659         # First generate most of the Java code, note that we need information about java method argument strings for C
 660         out_java_trait = out_java_trait + self.hu_struct_file_prefix
 661         if trait_doc_comment is not None:
 662             out_java_trait += "/**\n * " + trait_doc_comment.replace("\n", "\n * ") + "\n */\n"
 663         out_java_trait += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
 664         out_java_trait = out_java_trait + "public class " + struct_name.replace("LDK","") + " extends CommonBase {\n"
 665         out_java_trait = out_java_trait + "\tfinal bindings." + struct_name + " bindings_instance;\n"
 666         out_java_trait = out_java_trait + "\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n"
 667         out_java_trait = out_java_trait + "\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg"
 668         for var in flattened_field_vars:
 669             if isinstance(var, ConvInfo):
 670                 out_java_trait = out_java_trait + ", " + var.java_hu_ty + " " + var.arg_name
 671             else:
 672                 out_java_trait = out_java_trait + ", bindings." + var[0] + " " + var[1]
 673         out_java_trait = out_java_trait + ") {\n"
 674         out_java_trait = out_java_trait + "\t\tsuper(bindings." + struct_name + "_new(arg"
 675         for var in flattened_field_vars:
 676             if isinstance(var, ConvInfo):
 677                 if var.from_hu_conv is not None:
 678                     out_java_trait = out_java_trait + ", " + var.from_hu_conv[0]
 679                 else:
 680                     out_java_trait = out_java_trait + ", " + var.arg_name
 681             else:
 682                 out_java_trait = out_java_trait + ", " + var[1]
 683         out_java_trait = out_java_trait + "));\n"
 684         out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(arg);\n"
 685         for var in flattened_field_vars:
 686             if isinstance(var, ConvInfo):
 687                 if var.from_hu_conv is not None and var.from_hu_conv[1] != "":
 688                     out_java_trait = out_java_trait + "\t\t" + var.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n"
 689             else:
 690                 out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(" + var[1] + ");\n"
 691         out_java_trait = out_java_trait + "\t\tthis.bindings_instance = arg;\n"
 692         out_java_trait = out_java_trait + "\t}\n"
 693         out_java_trait = out_java_trait + "\t@Override @SuppressWarnings(\"deprecation\")\n"
 694         out_java_trait = out_java_trait + "\tprotected void finalize() throws Throwable {\n"
 695         out_java_trait = out_java_trait + "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n"
 696         out_java_trait = out_java_trait + "\t}\n\n"
 697
 698         java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
 699         java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 700         for var in flattened_field_vars:
 701             if isinstance(var, ConvInfo):
 702                 java_trait_constr = java_trait_constr + ", " + var.java_hu_ty + " " + var.arg_name
 703             else:
 704                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 705                 # Java-implemented version, so we require users pass a Java implementation here :/
 706                 java_trait_constr = java_trait_constr + ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 707         java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 708         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
 709         out_java_trait = out_java_trait + "\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n"
 710         out_java = out_java + "\tpublic interface " + struct_name + " {\n"
 711         java_meths = []
 712         for fn_line in field_fns:
 713             java_meth_descr = "("
 714             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 715                 out_java = out_java + "\t\t " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 716                 java_trait_constr = java_trait_constr + "\t\t\t@Override public " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 717                 out_java_trait += "\t\t/**\n\t\t * " + fn_line.docs.replace("\n", "\n\t\t * ") + "\n\t\t */\n"
 718                 out_java_trait = out_java_trait + "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_line.fn_name + "("
 719
 720                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 721                     if idx >= 1:
 722                         out_java = out_java + ", "
 723                         java_trait_constr = java_trait_constr + ", "
 724                         out_java_trait = out_java_trait + ", "
 725                     out_java = out_java + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 726                     out_java_trait = out_java_trait + arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name
 727                     java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 728                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 729                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 730                 java_meths.append((fn_line.fn_name, java_meth_descr))
 731
 732                 out_java = out_java + ");\n"
 733                 out_java_trait = out_java_trait + ");\n"
 734                 java_trait_constr = java_trait_constr + ") {\n"
 735
 736                 for arg_info in fn_line.args_ty:
 737                     if arg_info.to_hu_conv is not None:
 738                         java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 739
 740                 if fn_line.ret_ty_info.java_ty != "void":
 741                     java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 742                 else:
 743                     java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.fn_name + "("
 744
 745                 for idx, arg_info in enumerate(fn_line.args_ty):
 746                     if idx != 0:
 747                         java_trait_constr = java_trait_constr + ", "
 748                     if arg_info.to_hu_conv_name is not None:
 749                         java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
 750                     else:
 751                         java_trait_constr = java_trait_constr + arg_info.arg_name
 752
 753                 java_trait_constr = java_trait_constr + ");\n"
 754                 if fn_line.ret_ty_info.java_ty != "void":
 755                     if fn_line.ret_ty_info.from_hu_conv is not None:
 756                         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"
 757                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 758                             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"
 759                         #if fn_line.ret_ty_info.rust_obj in result_types:
 760                         java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
 761                     else:
 762                         java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
 763                 java_trait_constr = java_trait_constr + "\t\t\t}\n"
 764         java_trait_constr = java_trait_constr + "\t\t}"
 765         for var in field_vars:
 766             if isinstance(var, ConvInfo):
 767                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 768             else:
 769                 java_trait_constr += ", " + var[1] + ".new_impl(" + var[1] + "_impl"
 770                 for suparg in var[2]:
 771                     if isinstance(suparg, ConvInfo):
 772                         java_trait_constr += ", " + suparg.arg_name
 773                     else:
 774                         java_trait_constr += ", " + suparg[1]
 775                 java_trait_constr += ").bindings_instance"
 776                 for suparg in var[2]:
 777                     if isinstance(suparg, ConvInfo):
 778                         java_trait_constr += ", " + suparg.arg_name
 779                     else:
 780                         java_trait_constr += ", " + suparg[1]
 781         out_java_trait = out_java_trait + "\t}\n"
 782         out_java_trait = out_java_trait + java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 783
 784         out_java = out_java + "\t}\n"
 785
 786         out_java = out_java + "\tpublic static native long " + struct_name + "_new(" + struct_name + " impl"
 787         for var in flattened_field_vars:
 788             if isinstance(var, ConvInfo):
 789                 out_java = out_java + ", " + var.java_ty + " " + var.arg_name
 790             else:
 791                 out_java = out_java + ", " + var[0] + " " + var[1]
 792         out_java = out_java + ");\n"
 793
 794         # Now that we've written out our java code (and created java_meths), generate C
 795         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 796         out_c = out_c + "\tatomic_size_t refcnt;\n"
 797         out_c = out_c + "\tJavaVM *vm;\n"
 798         out_c = out_c + "\tjweak o;\n"
 799         for var in flattened_field_vars:
 800             if isinstance(var, ConvInfo):
 801                 # We're a regular ol' field
 802                 pass
 803             else:
 804                 # We're a supertrait
 805                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 806         for fn in field_fns:
 807             if fn.fn_name != "free" and fn.fn_name != "cloned":
 808                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 809         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 810
 811         for fn_line in field_fns:
 812             if fn_line.fn_name == "free":
 813                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 814                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 815                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 816                 out_c += "\t\t" + self.construct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 817                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 818                 out_c += "\t\t" + self.deconstruct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 819                 out_c = out_c + "\t\tFREE(j_calls);\n"
 820                 out_c = out_c + "\t}\n}\n"
 821
 822         for idx, fn_line in enumerate(field_fns):
 823             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 824                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 825                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 826                 if fn_line.self_is_const:
 827                     out_c = out_c + "const void* this_arg"
 828                 else:
 829                     out_c = out_c + "void* this_arg"
 830
 831                 for idx, arg in enumerate(fn_line.args_ty):
 832                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 833
 834                 out_c = out_c + ") {\n"
 835                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 836                 out_c += "\t" + self.construct_jenv().replace("\n", "\n\t").strip() + "\n"
 837
 838                 for arg_info in fn_line.args_ty:
 839                     if arg_info.ret_conv is not None:
 840                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 841                         out_c = out_c + arg_info.arg_name
 842                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 843
 844                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 845                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 846                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 847                 elif fn_line.ret_ty_info.c_ty == "void":
 848                     out_c += "\t(*env)->Call" + fn_line.ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 849                 elif not fn_line.ret_ty_info.passed_as_ptr:
 850                     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"
 851                 else:
 852                     out_c = out_c + "\tuint64_t ret = (*env)->CallLongMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 853
 854                 for idx, arg_info in enumerate(fn_line.args_ty):
 855                     if arg_info.ret_conv is not None:
 856                         out_c = out_c + ", " + arg_info.ret_conv_name
 857                     else:
 858                         out_c = out_c + ", " + arg_info.arg_name
 859                 out_c = out_c + ");\n"
 860
 861                 out_c += "\tif ((*env)->ExceptionCheck(env)) {\n"
 862                 out_c += "\t\t(*env)->ExceptionDescribe(env);\n"
 863                 out_c += "\t\t(*env)->FatalError(env, \"A call to " + fn_line.fn_name + " in " + struct_name + " from rust threw an exception.\");\n"
 864                 out_c += "\t}\n"
 865
 866                 if fn_line.ret_ty_info.arg_conv is not None:
 867                     out_c += "\t" + fn_line.ret_ty_info.arg_conv.replace("\n", "\n\t") + "\n"
 868                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
 869                     out_c += "\treturn " + fn_line.ret_ty_info.arg_conv_name + ";\n"
 870                 else:
 871                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
 872                     if not fn_line.ret_ty_info.passed_as_ptr and fn_line.ret_ty_info.c_ty != "void":
 873                         out_c += "\treturn ret;\n"
 874
 875                 out_c = out_c + "}\n"
 876
 877         # If we can, write out a clone function whether we need one or not, as we use them in moving to rust
 878         can_clone_with_ptr = True
 879         for var in field_vars:
 880             if isinstance(var, ConvInfo):
 881                 can_clone_with_ptr = False
 882         if can_clone_with_ptr:
 883             out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
 884             out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
 885             out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 886             for var in field_vars:
 887                 if not isinstance(var, ConvInfo):
 888                     out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 889             out_c = out_c + "}\n"
 890
 891         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 892         for var in flattened_field_vars:
 893             if isinstance(var, ConvInfo):
 894                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 895             else:
 896                 out_c = out_c + ", jobject " + var[1]
 897         out_c = out_c + ") {\n"
 898
 899         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 900         out_c = out_c + "\tCHECK(c != NULL);\n"
 901         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 902         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 903         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 904         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 905
 906         for (fn_name, java_meth_descr) in java_meths:
 907             if fn_name != "free" and fn_name != "cloned":
 908                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 909                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 910
 911         for var in flattened_field_vars:
 912             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 913                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 914         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 915         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 916         for fn_line in field_fns:
 917             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 918                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 919             elif fn_line.fn_name == "free":
 920                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 921             else:
 922                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
 923         for var in field_vars:
 924             if isinstance(var, ConvInfo):
 925                 if var.arg_conv_name is not None:
 926                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 927                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 928                 else:
 929                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 930                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 931             else:
 932                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1]
 933                 for suparg in var[2]:
 934                     if isinstance(suparg, ConvInfo):
 935                         out_c = out_c + ", " + suparg.arg_name
 936                     else:
 937                         out_c = out_c + ", " + suparg[1]
 938                 out_c += "),\n"
 939         out_c = out_c + "\t};\n"
 940         for var in flattened_field_vars:
 941             if not isinstance(var, ConvInfo):
 942                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 943         out_c = out_c + "\treturn ret;\n"
 944         out_c = out_c + "}\n"
 945
 946         out_c = out_c + self.c_fn_ty_pfx + "int64_t " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "jobject o"
 947         for var in flattened_field_vars:
 948             if isinstance(var, ConvInfo):
 949                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 950             else:
 951                 out_c = out_c + ", jobject " + var[1]
 952         out_c = out_c + ") {\n"
 953         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 954         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 955         for var in flattened_field_vars:
 956             if isinstance(var, ConvInfo):
 957                 out_c = out_c + ", " + var.arg_name
 958             else:
 959                 out_c = out_c + ", " + var[1]
 960         out_c = out_c + ");\n"
 961         out_c = out_c + "\treturn (uint64_t)res_ptr;\n"
 962         out_c = out_c + "}\n"
 963
 964         for var in flattened_field_vars:
 965             if not isinstance(var, ConvInfo):
 966                 out_java_trait += "\n\t/**\n"
 967                 out_java_trait += "\t * Gets the underlying " + var[1] + ".\n"
 968                 out_java_trait += "\t */\n"
 969                 underscore_name = ''.join('_' + c.lower() if c.isupper() else c for c in var[1]).strip('_')
 970                 out_java_trait += "\tpublic " + var[1] + " get_" + underscore_name + "() {\n"
 971                 out_java_trait += "\t\t" + var[1] + " res = new " + var[1] + "(null, bindings." + struct_name + "_get_" + var[1] + "(this.ptr));\n"
 972                 out_java_trait += "\t\tthis.ptrs_to.add(res);\n"
 973                 out_java_trait += "\t\treturn res;\n"
 974                 out_java_trait += "\t}\n"
 975                 out_java_trait += "\n"
 976
 977                 out_java += "\tpublic static native long " + struct_name + "_get_" + var[1] + "(long arg);\n"
 978
 979                 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"
 980                 out_c += "\t" + struct_name + " *inp = (" + struct_name + " *)(arg & ~1);\n"
 981                 out_c += "\tuint64_t res_ptr = (uint64_t)&inp->" + var[1] + ";\n"
 982                 out_c += "\tDO_ASSERT((res_ptr & 1) == 0);\n"
 983                 out_c += "\treturn (int64_t)(res_ptr | 1);\n"
 984                 out_c += "}\n"
 985
 986         return (out_java, out_java_trait, out_c)
 987
 988     def trait_struct_inc_refcnt(self, ty_info):
 989         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 990         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 991         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_cloned(&" + ty_info.var_name + "_conv);\n}"
 992         return base_conv
 993
 994     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
 995         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
 996         out_java_enum = ""
 997         out_java = ""
 998         out_c = ""
 999
1000         out_java_enum += (self.hu_struct_file_prefix)
1001         out_java_enum += "\n/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
1002         out_java_enum += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
1003         out_java_enum += ("public class " + java_hu_type + " extends CommonBase {\n")
1004         out_java_enum += ("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
1005         out_java_enum += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
1006         out_java_enum += ("\tprotected void finalize() throws Throwable {\n")
1007         out_java_enum += ("\t\tsuper.finalize();\n")
1008         out_java_enum += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK", "") + "_free(ptr); }\n")
1009         out_java_enum += ("\t}\n")
1010         out_java_enum += ("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
1011         out_java_enum += ("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
1012         java_hu_subclasses = ""
1013
1014         init_meth_jty_strs = {}
1015
1016         out_java +=  ("\tpublic static class " + struct_name + " {\n")
1017         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
1018         for var in variant_list:
1019             out_java +=  ("\t\tpublic final static class " + var.var_name + " extends " + struct_name + " {\n")
1020             java_hu_subclasses = java_hu_subclasses + "\tpublic final static class " + var.var_name + " extends " + java_hu_type + " {\n"
1021             out_java_enum += ("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var.var_name + ".class) {\n")
1022             out_java_enum += ("\t\t\treturn new " + var.var_name + "(ptr, (bindings." + struct_name + "." + var.var_name + ")raw_val);\n")
1023             init_meth_jty_str = ""
1024             init_meth_params = ""
1025             init_meth_body = ""
1026             hu_conv_body = ""
1027             for idx, (field_ty, field_docs) in enumerate(var.fields):
1028                 if idx > 0:
1029                     init_meth_params = init_meth_params + ", "
1030
1031                 if field_ty.java_hu_ty == var.var_name:
1032                     field_path = field_ty.java_fn_ty_arg.strip("L;").replace("/", ".")
1033                     out_java += "\t\t\tpublic " + field_path + " " + field_ty.arg_name + ";\n"
1034                     java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_path + " " + field_ty.arg_name + ";\n"
1035                     init_meth_params = init_meth_params + field_path + " " + field_ty.arg_name
1036                 else:
1037                     out_java += "\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n"
1038                     if field_docs is not None:
1039                         java_hu_subclasses += "\t\t/**\n\t\t * " + field_docs.replace("\n", "\n\t\t * ") + "\n\t\t*/\n"
1040                     java_hu_subclasses += "\t\t"
1041                     if field_ty.nullable:
1042                         java_hu_subclasses += "@Nullable "
1043                     java_hu_subclasses += "public final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
1044                     init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
1045                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
1046                 if field_ty.to_hu_conv is not None:
1047                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1048                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1049                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1050                 else:
1051                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1052                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
1053             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
1054             out_java +=  (init_meth_body)
1055             out_java +=  ("}\n")
1056             out_java += ("\t\t}\n")
1057             out_java_enum += ("\t\t}\n")
1058             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"
1059             java_hu_subclasses = java_hu_subclasses + hu_conv_body
1060             java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
1061             init_meth_jty_strs[var.var_name] = init_meth_jty_str
1062         out_java += ("\t\tstatic native void init();\n")
1063         out_java += ("\t}\n")
1064         out_java_enum += ("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
1065         out_java_enum += (java_hu_subclasses)
1066         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
1067         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
1068
1069         out_c += (self.c_complex_enum_pfx(struct_name, [x.var_name for x in variant_list], init_meth_jty_strs))
1070
1071         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")
1072         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n")
1073         out_c += ("\tswitch(obj->tag) {\n")
1074         for var in variant_list:
1075             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
1076             c_params = []
1077             for idx, (field_map, field_docs) in enumerate(var.fields):
1078                 if field_map.ret_conv is not None:
1079                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1080                     if var.tuple_variant:
1081                         out_c += "obj->" + camel_to_snake(var.var_name)
1082                     else:
1083                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
1084                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1085                     c_params.append(field_map.ret_conv_name)
1086                 else:
1087                     if var.tuple_variant:
1088                         c_params.append("obj->" + camel_to_snake(var.var_name))
1089                     else:
1090                         c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
1091             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
1092             out_c += ("\t\t}\n")
1093         out_c += ("\t\tdefault: abort();\n")
1094         out_c += ("\t}\n}\n")
1095         return (out_java, out_java_enum, out_c)
1096
1097     def map_opaque_struct(self, struct_name, struct_doc_comment):
1098         out_opaque_struct_human = ""
1099         out_opaque_struct_human += self.hu_struct_file_prefix
1100         out_opaque_struct_human += "\n/**\n * " + struct_doc_comment.replace("\n", "\n * ") + "\n */\n"
1101         out_opaque_struct_human += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
1102         out_opaque_struct_human += ("public class " + struct_name.replace("LDK","") + " extends CommonBase")
1103         if struct_name.startswith("LDKLocked"):
1104             out_opaque_struct_human += (" implements AutoCloseable")
1105         out_opaque_struct_human += (" {\n")
1106         out_opaque_struct_human += ("\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); }\n")
1107         if struct_name.startswith("LDKLocked"):
1108             out_opaque_struct_human += ("\t@Override public void close() {\n")
1109         else:
1110             out_opaque_struct_human += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
1111             out_opaque_struct_human += ("\tprotected void finalize() throws Throwable {\n")
1112             out_opaque_struct_human += ("\t\tsuper.finalize();\n")
1113         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
1114         out_opaque_struct_human += ("\t}\n\n")
1115         return out_opaque_struct_human
1116
1117
1118     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):
1119         out_java = ""
1120         out_c = ""
1121         out_java_struct = None
1122
1123         out_java += ("\tpublic static native ")
1124         out_c += (self.c_fn_ty_pfx)
1125         out_c += (return_type_info.c_ty)
1126         out_java += (return_type_info.java_ty)
1127         if return_type_info.ret_conv is not None:
1128             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1129         out_java += (" " + method_name + "(")
1130         have_args = len(argument_types) > 1 or (len(argument_types) > 0 and argument_types[0].c_ty != "void")
1131         out_c += (" " + self.c_fn_name_define_pfx(method_name, have_args))
1132
1133         for idx, arg_conv_info in enumerate(argument_types):
1134             if idx != 0:
1135                 out_java += (", ")
1136                 out_c += (", ")
1137             if arg_conv_info.c_ty != "void":
1138                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1139                 out_java += (arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
1140
1141         out_java_struct = ""
1142         if not args_known:
1143             out_java_struct += ("\t// Skipped " + method_name + "\n")
1144         else:
1145             meth_n = method_name[len(struct_meth) + 1 if len(struct_meth) != 0 else 0:].strip("_")
1146             if doc_comment is not None:
1147                 out_java_struct += "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
1148             if return_type_info.nullable:
1149                 out_java_struct += "\t@Nullable\n"
1150             if not takes_self:
1151                 if meth_n == "new":
1152                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " of("
1153                 elif meth_n == "default":
1154                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " with_default("
1155                 else:
1156                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " " + meth_n + "("
1157             else:
1158                 out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
1159             for idx, arg in enumerate(argument_types):
1160                 if idx != 0:
1161                     if not takes_self or idx > 1:
1162                         out_java_struct += ", "
1163                 elif takes_self:
1164                     continue
1165                 if arg.java_ty != "void":
1166                     if arg.arg_name in default_constructor_args:
1167                         assert not arg.nullable
1168                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1169                             if explode_idx != 0:
1170                                 out_java_struct += (", ")
1171                             out_java_struct += (
1172                                 explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
1173                     else:
1174                         if arg.nullable:
1175                             out_java_struct += "@Nullable "
1176                         ty_string = arg.java_hu_ty
1177                         if arg.java_fn_ty_arg[0] == "L" and arg.java_fn_ty_arg[len(arg.java_fn_ty_arg) - 1] == ";":
1178                             ty_string = arg.java_fn_ty_arg.strip("L;").replace("/", ".")
1179                         out_java_struct += ty_string + " " + arg.arg_name
1180         out_java += (");\n")
1181         out_c += (") {\n")
1182         if out_java_struct is not None:
1183             out_java_struct += (") {\n")
1184         for info in argument_types:
1185             if info.arg_conv is not None:
1186                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1187         if return_type_info.ret_conv is not None:
1188             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1189         elif return_type_info.c_ty != "void":
1190             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1191         else:
1192             out_c += ("\t")
1193         if c_call_string is None:
1194             out_c += (method_name + "(")
1195         else:
1196             out_c += (c_call_string)
1197         for idx, info in enumerate(argument_types):
1198             if info.arg_conv_name is not None:
1199                 if idx != 0:
1200                     out_c += (", ")
1201                 elif c_call_string is not None:
1202                     continue
1203                 out_c += (info.arg_conv_name)
1204         out_c += (")")
1205         if return_type_info.ret_conv is not None:
1206             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1207         else:
1208             out_c += (";")
1209         for info in argument_types:
1210             if info.arg_conv_cleanup is not None:
1211                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1212         if return_type_info.ret_conv is not None:
1213             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1214         elif return_type_info.c_ty != "void":
1215             out_c += ("\n\treturn ret_val;")
1216         out_c += ("\n}\n\n")
1217
1218         if args_known:
1219             out_java_struct += ("\t\t")
1220             if return_type_info.java_ty != "void":
1221                 out_java_struct += (return_type_info.java_ty + " ret = ")
1222             out_java_struct += ("bindings." + method_name + "(")
1223             for idx, info in enumerate(argument_types):
1224                 if idx != 0:
1225                     out_java_struct += (", ")
1226                 if idx == 0 and takes_self:
1227                     out_java_struct += ("this.ptr")
1228                 elif info.arg_name in default_constructor_args:
1229                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1230                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1231                         if explode_idx != 0:
1232                             out_java_struct += (", ")
1233                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1234                         if explode_arg.from_hu_conv is not None:
1235                             out_java_struct += (
1236                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1237                         else:
1238                             out_java_struct += (expl_arg_name)
1239                     out_java_struct += (")")
1240                 elif info.from_hu_conv is not None:
1241                     out_java_struct += (info.from_hu_conv[0])
1242                 else:
1243                     out_java_struct += (info.arg_name)
1244             out_java_struct += (");\n")
1245             if return_type_info.java_ty == "long" and return_type_info.java_hu_ty != "long":
1246                 out_java_struct += "\t\tif (ret < 1024) { return null; }\n"
1247
1248             if return_type_info.to_hu_conv is not None:
1249                 if not takes_self:
1250                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1251                                                                                                                return_type_info.to_hu_conv_name) + "\n")
1252                 else:
1253                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1254
1255             for idx, info in enumerate(argument_types):
1256                 if idx == 0 and takes_self:
1257                     pass
1258                 elif info.arg_name in default_constructor_args:
1259                     for explode_arg in default_constructor_args[info.arg_name]:
1260                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1261                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1262                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1263                                                                                                expl_arg_name).replace(
1264                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1265                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1266                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1267                         out_java_struct += (
1268                             "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1269                     else:
1270                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1271
1272             if takes_self and not takes_self_as_ref:
1273                 out_java_struct += "\t\t" + argument_types[0].from_hu_conv[1].replace("\n", "\n\t\t").replace("this_arg", "this") + ";\n"
1274             if return_type_info.to_hu_conv_name is not None:
1275                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1276             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1277                 out_java_struct += ("\t\treturn ret;\n")
1278             out_java_struct += ("\t}\n\n")
1279
1280         return (out_java, out_c, out_java_struct)