_ 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 = null; if ({var_name} < 0 || {var_name} > 4096) { {var_name}_hu_conv = new {human_type}(null, {var_name}); }',
  22             default = '{human_type} {var_name}_hu_conv = null; if ({var_name} < 0 || {var_name} > 4096) { {var_name}_hu_conv = new {human_type}(null, {var_name}); }'
  23         )
  24
  25         self.bindings_header = """package org.ldk.impl;
  26 import org.ldk.enums.*;
  27 import org.ldk.impl.version;
  28 import java.io.File;
  29 import java.io.InputStream;
  30 import java.io.IOException;
  31 import java.nio.file.Files;
  32 import java.nio.file.Path;
  33 import java.nio.file.StandardCopyOption;
  34
  35 public class bindings {
  36         public static class VecOrSliceDef {
  37                 public long dataptr;
  38                 public long datalen;
  39                 public long stride;
  40                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
  41                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
  42                 }
  43         }
  44         static {
  45                 try {
  46                         // Try to load natively first, this works on Android and in testing.
  47                         System.loadLibrary(\"lightningjni\");
  48                 } catch (UnsatisfiedLinkError system_load_err) {
  49                         // Otherwise try to load from the library jar.
  50                         File tmpdir = new File(System.getProperty("java.io.tmpdir"), "ldk-java-nativelib");
  51                         tmpdir.mkdir(); // If it fails to create, assume it was there already
  52                         tmpdir.deleteOnExit();
  53                         String libname = "liblightningjni_" + System.getProperty("os.name").replaceAll(" ", "") +
  54                                 "-" + System.getProperty("os.arch").replaceAll(" ", "") + ".nativelib";
  55                         try (InputStream is = bindings.class.getResourceAsStream("/" + libname)) {
  56                                 Path libpath = new File(tmpdir.toPath().toString(), "liblightningjni.so").toPath();
  57                                 Files.copy(is, libpath, StandardCopyOption.REPLACE_EXISTING);
  58                                 Runtime.getRuntime().load(libpath.toString());
  59                         } catch (Exception e) {
  60                                 System.err.println("Failed to load LDK native library.");
  61                                 System.err.println("System LDK native library load failed with: " + system_load_err);
  62                                 System.err.println("Resource-based LDK native library load failed with: " + e);
  63                                 throw new IllegalArgumentException(e);
  64                         }
  65                 }
  66                 init(java.lang.Enum.class, VecOrSliceDef.class);
  67                 init_class_cache();
  68                 if (!get_lib_version_string().equals(version.get_ldk_java_bindings_version()))
  69                         throw new IllegalArgumentException("Compiled LDK library and LDK class failes do not match");
  70                 // Fetching the LDK versions from C also checks that the header and binaries match
  71                 get_ldk_c_bindings_version();
  72                 get_ldk_version();
  73         }
  74         static native void init(java.lang.Class c, java.lang.Class slicedef);
  75         static native void init_class_cache();
  76         static native String get_lib_version_string();
  77
  78         public static native String get_ldk_c_bindings_version();
  79         public static native String get_ldk_version();
  80
  81         public static native boolean deref_bool(long ptr);
  82         public static native long deref_long(long ptr);
  83         public static native void free_heap_ptr(long ptr);
  84         public static native byte[] read_bytes(long ptr, long len);
  85         public static native byte[] get_u8_slice_bytes(long slice_ptr);
  86         public static native long bytes_to_u8_vec(byte[] bytes);
  87         public static native long new_txpointer_copy_data(byte[] txdata);
  88         public static native void txpointer_free(long ptr);
  89         public static native byte[] txpointer_get_buffer(long ptr);
  90         public static native long vec_slice_len(long vec);
  91         public static native long new_empty_slice_vec();
  92
  93 """
  94         self.bindings_version_file = """package org.ldk.impl;
  95
  96 public class version {
  97         public static String get_ldk_java_bindings_version() {
  98                 return "<git_version_ldk_garbagecollected>";
  99         }
 100 }"""
 101
 102         self.bindings_footer = "}\n"
 103
 104         self.util_fn_pfx = """package org.ldk.structs;
 105 import org.ldk.impl.bindings;
 106 import org.ldk.enums.*;
 107 import org.ldk.util.*;
 108 import java.util.Arrays;
 109 import javax.annotation.Nullable;
 110
 111 public class UtilMethods {
 112 """
 113         self.util_fn_sfx = "}"
 114         self.common_base = """package org.ldk.structs;
 115 import java.util.LinkedList;
 116 class CommonBase {
 117         long ptr;
 118         LinkedList<Object> ptrs_to = new LinkedList();
 119         protected CommonBase(long ptr) { assert ptr < 0 || ptr > 4096; this.ptr = ptr; }
 120 }
 121 """
 122
 123         self.c_file_pfx = """#include <jni.h>
 124 // On OSX jlong (ie long long) is not equivalent to int64_t, so we override here
 125 #define int64_t jlong
 126 #include \"org_ldk_impl_bindings.h\"
 127 #include <lightning.h>
 128 #include <string.h>
 129 #include <stdatomic.h>
 130 #include <stdlib.h>
 131
 132 """
 133
 134         if self.target == Target.ANDROID:
 135             self.c_file_pfx = self.c_file_pfx + """
 136 #include <android/log.h>
 137 #define DEBUG_PRINT(...) __android_log_print(ANDROID_LOG_ERROR, "LDK", __VA_ARGS__)
 138
 139 #include <unistd.h>
 140 #include <pthread.h>
 141 static void* redirect_stderr(void* ignored) {
 142         int pipes[2];
 143         pipe(pipes);
 144         dup2(pipes[1], STDERR_FILENO);
 145         char buf[8192];
 146         memset(buf, 0, 8192);
 147         ssize_t len;
 148         while ((len = read(pipes[0], buf, 8191)) > 0) {
 149                 DEBUG_PRINT("%s\\n", buf);
 150                 memset(buf, 0, 8192);
 151         }
 152         DEBUG_PRINT("End of stderr???\\n");
 153         return 0;
 154 }
 155 void __attribute__((constructor)) spawn_stderr_redirection() {
 156         pthread_t thread;
 157         pthread_create(&thread, NULL, &redirect_stderr, NULL);
 158 }
 159 """
 160         else:
 161             self.c_file_pfx = self.c_file_pfx + "#define DEBUG_PRINT(...) fprintf(stderr, __VA_ARGS__)\n"
 162
 163         if not DEBUG or sys.platform == "darwin":
 164             self.c_file_pfx = self.c_file_pfx + """#define MALLOC(a, _) malloc(a)
 165 #define FREE(p) if ((uint64_t)(p) > 4096) { free(p); }
 166 #define CHECK_ACCESS(p)
 167 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v)
 168 """
 169         if not DEBUG:
 170             self.c_file_pfx += """#define DO_ASSERT(a) (void)(a)
 171 #define CHECK(a)
 172 """
 173         if DEBUG:
 174             self.c_file_pfx = self.c_file_pfx + """#include <assert.h>
 175 // Always run a, then assert it is true:
 176 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 177 // Assert a is true or do nothing
 178 #define CHECK(a) DO_ASSERT(a)
 179
 180 void __attribute__((constructor)) debug_log_version() {
 181         if (check_get_ldk_version() == NULL)
 182                 DEBUG_PRINT("LDK version did not match the header we built against\\n");
 183         if (check_get_ldk_bindings_version() == NULL)
 184                 DEBUG_PRINT("LDK C Bindings version did not match the header we built against\\n");
 185         DEBUG_PRINT("Loaded LDK-Java Bindings with LDK %s and LDK-C-Bindings %s\\n", check_get_ldk_version(), check_get_ldk_bindings_version());
 186 }
 187 """
 188
 189             if sys.platform != "darwin":
 190                 self.c_file_pfx += """
 191 // Running a leak check across all the allocations and frees of the JDK is a mess,
 192 // so instead we implement our own naive leak checker here, relying on the -wrap
 193 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 194 // and free'd in Rust or C across the generated bindings shared library.
 195 #include <threads.h>
 196 """
 197
 198                 if self.target == Target.ANDROID:
 199                     self.c_file_pfx = self.c_file_pfx + """
 200 #include <unwind.h>
 201 #include <dlfcn.h>
 202
 203 // Implement the execinfo functions using _Unwind_backtrace. This seems to miss many Rust
 204 // symbols, so we only use it on Android, where execinfo.h is unavailable.
 205
 206 struct BacktraceState {
 207         void** current;
 208         void** end;
 209 };
 210 static _Unwind_Reason_Code unwind_callback(struct _Unwind_Context* context, void* arg) {
 211         struct BacktraceState* state = (struct BacktraceState*)arg;
 212         uintptr_t pc = _Unwind_GetIP(context);
 213         if (pc) {
 214                 if (state->current == state->end) {
 215                         return _URC_END_OF_STACK;
 216                 } else {
 217                         *state->current++ = (void*)(pc);
 218                 }
 219         }
 220         return _URC_NO_REASON;
 221 }
 222
 223 int backtrace(void** buffer, int max) {
 224         struct BacktraceState state = { buffer, buffer + max };
 225         _Unwind_Backtrace(unwind_callback, &state);
 226         return state.current - buffer;
 227 }
 228
 229 void backtrace_symbols_fd(void ** buffer, int count, int _fd) {
 230         for (int idx = 0; idx < count; ++idx) {
 231                 Dl_info info;
 232                 if (dladdr(buffer[idx], &info) && info.dli_sname) {
 233                         DEBUG_PRINT("%p: %s", buffer[idx], info.dli_sname);
 234                 } else {
 235                         DEBUG_PRINT("%p: ???", buffer[idx]);
 236                 }
 237         }
 238 }
 239 """
 240                 else:
 241                     self.c_file_pfx = self.c_file_pfx + "#include <execinfo.h>\n"
 242                 self.c_file_pfx = self.c_file_pfx + """
 243 #include <unistd.h>
 244 #include <pthread.h>
 245 static pthread_mutex_t allocation_mtx;
 246
 247 void __attribute__((constructor)) init_mtx() {
 248         DO_ASSERT(!pthread_mutex_init(&allocation_mtx, NULL));
 249 }
 250
 251 #define BT_MAX 128
 252 typedef struct allocation {
 253         struct allocation* next;
 254         void* ptr;
 255         const char* struct_name;
 256         void* bt[BT_MAX];
 257         int bt_len;
 258         unsigned long alloc_len;
 259 } allocation;
 260 static allocation* allocation_ll = NULL;
 261
 262 void* __real_malloc(size_t len);
 263 void* __real_calloc(size_t nmemb, size_t len);
 264 static void new_allocation(void* res, const char* struct_name, size_t len) {
 265         allocation* new_alloc = __real_malloc(sizeof(allocation));
 266         new_alloc->ptr = res;
 267         new_alloc->struct_name = struct_name;
 268         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 269         new_alloc->alloc_len = len;
 270         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 271         new_alloc->next = allocation_ll;
 272         allocation_ll = new_alloc;
 273         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 274 }
 275 static void* MALLOC(size_t len, const char* struct_name) {
 276         void* res = __real_malloc(len);
 277         new_allocation(res, struct_name, len);
 278         return res;
 279 }
 280 void __real_free(void* ptr);
 281 static void alloc_freed(void* ptr) {
 282         allocation* p = NULL;
 283         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 284         allocation* it = allocation_ll;
 285         while (it->ptr != ptr) {
 286                 p = it; it = it->next;
 287                 if (it == NULL) {
 288                         DEBUG_PRINT("ERROR: Tried to free unknown pointer %p at:\\n", ptr);
 289                         void* bt[BT_MAX];
 290                         int bt_len = backtrace(bt, BT_MAX);
 291                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 292                         DEBUG_PRINT("\\n\\n");
 293                         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 294                         return; // addrsan should catch malloc-unknown and print more info than we have
 295                 }
 296         }
 297         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 298         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 299         DO_ASSERT(it->ptr == ptr);
 300         __real_free(it);
 301 }
 302 static void FREE(void* ptr) {
 303         if ((uint64_t)ptr <= 4096) return; // Rust loves to create pointers to the NULL page for dummys
 304         alloc_freed(ptr);
 305         __real_free(ptr);
 306 }
 307
 308 void* __wrap_malloc(size_t len) {
 309         void* res = __real_malloc(len);
 310         new_allocation(res, "malloc call", len);
 311         return res;
 312 }
 313 void* __wrap_calloc(size_t nmemb, size_t len) {
 314         void* res = __real_calloc(nmemb, len);
 315         new_allocation(res, "calloc call", len);
 316         return res;
 317 }
 318 void __wrap_free(void* ptr) {
 319         if (ptr == NULL) return;
 320         alloc_freed(ptr);
 321         __real_free(ptr);
 322 }
 323
 324 static void CHECK_ACCESS(const void* ptr) {
 325         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 326         allocation* it = allocation_ll;
 327         while (it->ptr != ptr) {
 328                 it = it->next;
 329                 if (it == NULL) {
 330                         DEBUG_PRINT("ERROR: Tried to access unknown pointer %p at:\\n", ptr);
 331                         void* bt[BT_MAX];
 332                         int bt_len = backtrace(bt, BT_MAX);
 333                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 334                         DEBUG_PRINT("\\n\\n");
 335                         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 336                         return; // addrsan should catch and print more info than we have
 337                 }
 338         }
 339         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 340 }
 341 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v) \\
 342         if (v.is_owned && v.inner != NULL) { \\
 343                 const void *p = __unmangle_inner_ptr(v.inner); \\
 344                 if (p != NULL) { \\
 345                         CHECK_ACCESS(p); \\
 346                 } \\
 347         }
 348
 349 void* __real_realloc(void* ptr, size_t newlen);
 350 void* __wrap_realloc(void* ptr, size_t len) {
 351         if (ptr != NULL) alloc_freed(ptr);
 352         void* res = __real_realloc(ptr, len);
 353         new_allocation(res, "realloc call", len);
 354         return res;
 355 }
 356 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 357         // Rust doesn't seem to use reallocarray currently
 358         DO_ASSERT(false);
 359 }
 360
 361 void __attribute__((destructor)) check_leaks() {
 362         unsigned long alloc_count = 0;
 363         unsigned long alloc_size = 0;
 364         DEBUG_PRINT("The following LDK-allocated blocks still remain.\\n");
 365         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 366         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 367         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 368                 DEBUG_PRINT("%s %p (%lu bytes) remains:\\n", a->struct_name, a->ptr, a->alloc_len);
 369                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 370                 DEBUG_PRINT("\\n\\n");
 371                 alloc_count++;
 372                 alloc_size += a->alloc_len;
 373         }
 374         DEBUG_PRINT("%lu allocations remained for %lu bytes.\\n", alloc_count, alloc_size);
 375         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 376         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 377 }
 378 """
 379         self.c_file_pfx = self.c_file_pfx + """
 380 static jmethodID ordinal_meth = NULL;
 381 static jmethodID slicedef_meth = NULL;
 382 static jclass slicedef_cls = NULL;
 383 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 384         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 385         CHECK(ordinal_meth != NULL);
 386         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 387         CHECK(slicedef_meth != NULL);
 388         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 389         CHECK(slicedef_cls != NULL);
 390 }
 391
 392 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 393         return *((bool*)ptr);
 394 }
 395 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 396         return *((long*)ptr);
 397 }
 398 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 399         FREE((void*)ptr);
 400 }
 401 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * env, jclass _b, jlong ptr, jlong len) {
 402         jbyteArray ret_arr = (*env)->NewByteArray(env, len);
 403         (*env)->SetByteArrayRegion(env, ret_arr, 0, len, (unsigned char*)ptr);
 404         return ret_arr;
 405 }
 406 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * env, jclass _b, jlong slice_ptr) {
 407         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 408         jbyteArray ret_arr = (*env)->NewByteArray(env, slice->datalen);
 409         (*env)->SetByteArrayRegion(env, ret_arr, 0, slice->datalen, slice->data);
 410         return ret_arr;
 411 }
 412 JNIEXPORT int64_t impl_bindings_bytes_1to_1u8_1vec (JNIEnv * env, jclass _b, jbyteArray bytes) {
 413         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 414         vec->datalen = (*env)->GetArrayLength(env, bytes);
 415         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 416         (*env)->GetByteArrayRegion (env, bytes, 0, vec->datalen, vec->data);
 417         return (uint64_t)vec;
 418 }
 419 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_txpointer_1get_1buffer (JNIEnv * env, jclass _b, jlong ptr) {
 420         LDKTransaction *txdata = (LDKTransaction*)ptr;
 421         LDKu8slice slice;
 422         slice.data = txdata->data;
 423         slice.datalen = txdata->datalen;
 424         return Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes(env, _b, (uint64_t)&slice);
 425 }
 426 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 427         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 428         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 429         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 430         txdata->data_is_owned = false;
 431         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
 432         return (uint64_t)txdata;
 433 }
 434 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_txpointer_1free (JNIEnv * env, jclass _b, jlong ptr) {
 435         LDKTransaction *tx = (LDKTransaction*)ptr;
 436         tx->data_is_owned = true;
 437         Transaction_free(*tx);
 438         FREE((void*)ptr);
 439 }
 440 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 441         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 442         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
 443         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
 444         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
 445         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
 446         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 447         return (uint64_t)vec->datalen;
 448 }
 449 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * env, jclass _b) {
 450         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
 451         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
 452         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
 453         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
 454         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
 455         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
 456         vec->data = NULL;
 457         vec->datalen = 0;
 458         return (uint64_t)vec;
 459 }
 460
 461 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 462 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 463 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 464 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 465
 466 _Static_assert(sizeof(jlong) == sizeof(int64_t), "We assume that j-types are the same as C types");
 467 _Static_assert(sizeof(jbyte) == sizeof(char), "We assume that j-types are the same as C types");
 468 _Static_assert(sizeof(void*) <= 8, "Pointers must fit into 64 bits");
 469
 470 typedef jlongArray int64_tArray;
 471 typedef jbyteArray int8_tArray;
 472
 473 static inline jstring str_ref_to_java(JNIEnv *env, const char* chars, size_t len) {
 474         // Sadly we need to create a temporary because Java can't accept a char* without a 0-terminator
 475         char* conv_buf = MALLOC(len + 1, "str conv buf");
 476         memcpy(conv_buf, chars, len);
 477         conv_buf[len] = 0;
 478         jstring ret = (*env)->NewStringUTF(env, conv_buf);
 479         FREE(conv_buf);
 480         return ret;
 481 }
 482 static inline LDKStr java_to_owned_str(JNIEnv *env, jstring str) {
 483         uint64_t str_len = (*env)->GetStringUTFLength(env, str);
 484         char* newchars = MALLOC(str_len + 1, "String chars");
 485         const char* jchars = (*env)->GetStringUTFChars(env, str, NULL);
 486         memcpy(newchars, jchars, str_len);
 487         newchars[str_len] = 0;
 488         (*env)->ReleaseStringUTFChars(env, str, jchars);
 489         LDKStr res = {
 490                 .chars = newchars,
 491                 .len = str_len,
 492                 .chars_is_owned = true
 493         };
 494         return res;
 495 }
 496
 497 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1ldk_1c_1bindings_1version(JNIEnv *env, jclass _c) {
 498         return str_ref_to_java(env, check_get_ldk_bindings_version(), strlen(check_get_ldk_bindings_version()));
 499 }
 500 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1ldk_1version(JNIEnv *env, jclass _c) {
 501         return str_ref_to_java(env, check_get_ldk_version(), strlen(check_get_ldk_version()));
 502 }
 503 #include "version.c"
 504 """
 505         self.c_version_file = """JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1lib_1version_1string(JNIEnv *env, jclass _c) {
 506         return str_ref_to_java(env, "<git_version_ldk_garbagecollected>", strlen("<git_version_ldk_garbagecollected>"));
 507 }"""
 508
 509         self.hu_struct_file_prefix = """package org.ldk.structs;
 510
 511 import org.ldk.impl.bindings;
 512 import org.ldk.enums.*;
 513 import org.ldk.util.*;
 514 import java.util.Arrays;
 515 import javax.annotation.Nullable;
 516
 517 """
 518         self.c_fn_ty_pfx = "JNIEXPORT "
 519         self.c_fn_args_pfx = "JNIEnv *env, jclass clz"
 520         self.file_ext = ".java"
 521         self.ptr_c_ty = "int64_t"
 522         self.ptr_native_ty = "long"
 523         self.result_c_ty = "jclass"
 524         self.ptr_arr = "jobjectArray"
 525         self.is_arr_some_check = ("", " != NULL")
 526         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 527
 528     def construct_jenv(self):
 529         res =  "JNIEnv *env;\n"
 530         res += "jint get_jenv_res = (*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_6);\n"
 531         res += "if (get_jenv_res == JNI_EDETACHED) {\n"
 532         if self.target == Target.ANDROID:
 533             res += "\tDO_ASSERT((*j_calls->vm)->AttachCurrentThread(j_calls->vm, &env, NULL) == JNI_OK);\n"
 534         else:
 535             res += "\tDO_ASSERT((*j_calls->vm)->AttachCurrentThread(j_calls->vm, (void**)&env, NULL) == JNI_OK);\n"
 536         res += "} else {\n"
 537         res += "\tDO_ASSERT(get_jenv_res == JNI_OK);\n"
 538         res += "}\n"
 539         return res
 540     def deconstruct_jenv(self):
 541         res = "if (get_jenv_res == JNI_EDETACHED) {\n"
 542         res += "\tDO_ASSERT((*j_calls->vm)->DetachCurrentThread(j_calls->vm) == JNI_OK);\n"
 543         res += "}\n"
 544         return res
 545
 546     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 547         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 548             return "(*env)->ReleasePrimitiveArrayCritical(env, " + arr_var + ", " + arr_ptr_var + ", 0)"
 549         return None
 550     def create_native_arr_call(self, arr_len, ty_info):
 551         if ty_info.c_ty == "int8_tArray":
 552             return "(*env)->NewByteArray(env, " + arr_len + ")"
 553         elif ty_info.subty.c_ty.endswith("Array"):
 554             clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 555             self.c_array_class_caches.add(clz_var)
 556             return "(*env)->NewObjectArray(env, " + arr_len + ", " + clz_var + "_clz, NULL);\n"
 557         else:
 558             return "(*env)->New" + ty_info.java_ty.strip("[]").title() + "Array(env, " + arr_len + ")"
 559     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 560         if ty_info.c_ty == "int8_tArray":
 561             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 562         else:
 563             assert False
 564     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 565         if ty_info.c_ty == "int8_tArray":
 566             if copy:
 567                 return "(*env)->GetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", " + dest_name + ")"
 568             else:
 569                 return "(*env)->GetByteArrayElements (env, " + arr_name + ", NULL)"
 570         elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 571             return "(*env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (env, " + arr_name + ", NULL)"
 572         else:
 573             return None
 574     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 575         if self.get_native_arr_contents(arr_name, "", "", ty_info, False) is None:
 576             return "(*env)->GetObjectArrayElement(env, " + arr_name + ", " + idxc + ")"
 577         else:
 578             assert False # Only called if above is None
 579     def get_native_arr_ptr_call(self, ty_info):
 580         if ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"):
 581             return None
 582         return ("(*env)->GetPrimitiveArrayCritical(env, ", ", NULL)")
 583     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 584         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 585             return None
 586         return "(*env)->SetObjectArrayElement(env, " + arr_name + ", " + idxc + ", " + entry_access + ")"
 587     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 588         if ty_info.c_ty == "int8_tArray":
 589             return "(*env)->ReleaseByteArrayElements(env, " + arr_name + ", (int8_t*)" + dest_name + ", 0);"
 590         else:
 591             return "(*env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements(env, " + arr_name + ", " + dest_name + ", 0)"
 592
 593     def str_ref_to_native_call(self, var_name, str_len):
 594         return "str_ref_to_java(env, " + var_name + ", " + str_len + ")"
 595     def str_ref_to_c_call(self, var_name):
 596         return "java_to_owned_str(env, " + var_name + ")"
 597
 598     def c_fn_name_define_pfx(self, fn_name, has_args):
 599         if has_args:
 600             return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz, "
 601         return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz"
 602
 603     def init_str(self):
 604         res = ""
 605         for ty in sorted(self.c_array_class_caches):
 606             res = res + "static jclass " + ty + "_clz = NULL;\n"
 607         res = res + "JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass clz) {\n"
 608         for ty in sorted(self.c_array_class_caches):
 609             res = res + "\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n"
 610             res = res + "\tCHECK(" + ty + "_clz != NULL);\n"
 611             res = res + "\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n"
 612         res = res + "}\n"
 613         return res
 614
 615     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 616         out_java_enum = "package org.ldk.enums;\n\n"
 617         out_java = ""
 618         out_c = ""
 619         out_c = out_c + "static inline LDK" + struct_name + " LDK" + struct_name + "_from_java(" + self.c_fn_args_pfx + ") {\n"
 620         out_c = out_c + "\tswitch ((*env)->CallIntMethod(env, clz, ordinal_meth)) {\n"
 621
 622         if enum_doc_comment is not None:
 623             out_java_enum += "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
 624         out_java_enum += "public enum " + struct_name + " {\n"
 625         ord_v = 0
 626         for var, var_docs in variants:
 627             if var_docs is not None:
 628                 out_java_enum += "\t/**\n\t * " + var_docs.replace("\n", "\n\t * ") + "\n\t */\n"
 629             out_java_enum += "\t" + var + ",\n"
 630             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 631             ord_v = ord_v + 1
 632         out_java_enum = out_java_enum + "\t; static native void init();\n"
 633         out_java_enum = out_java_enum + "\tstatic { init(); }\n"
 634         out_java_enum = out_java_enum + "}"
 635         out_java = out_java + "\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n"
 636         out_c = out_c + "\t}\n"
 637         out_c = out_c + "\tabort();\n"
 638         out_c = out_c + "}\n"
 639
 640         out_c = out_c + "static jclass " + struct_name + "_class = NULL;\n"
 641         for var, _ in variants:
 642             out_c = out_c + "static jfieldID " + struct_name + "_" + var + " = NULL;\n"
 643         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"
 644         out_c = out_c + "\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n"
 645         out_c = out_c + "\tCHECK(" + struct_name + "_class != NULL);\n"
 646         for var, _ in variants:
 647             out_c = out_c + "\t" + struct_name + "_" + var + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + var + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n"
 648             out_c = out_c + "\tCHECK(" + struct_name + "_" + var + " != NULL);\n"
 649         out_c = out_c + "}\n"
 650         out_c = out_c + "static inline jclass LDK" + struct_name + "_to_java(JNIEnv *env, LDK" + struct_name + " val) {\n"
 651         out_c = out_c + "\tswitch (val) {\n"
 652         ord_v = 0
 653         for var, _ in variants:
 654             out_c = out_c + "\t\tcase " + var + ":\n"
 655             out_c = out_c + "\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + var + ");\n"
 656             ord_v = ord_v + 1
 657         out_c = out_c + "\t\tdefault: abort();\n"
 658         out_c = out_c + "\t}\n"
 659         out_c = out_c + "}\n\n"
 660
 661         return (out_c, out_java_enum, out_java)
 662
 663     def c_unitary_enum_to_native_call(self, ty_info):
 664         return (ty_info.rust_obj + "_to_java(env, ", ")")
 665     def native_unitary_enum_to_c_call(self, ty_info):
 666         return (ty_info.rust_obj + "_from_java(env, ", ")")
 667
 668     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 669         out_c = ""
 670         for var in variants:
 671             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 672             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 673         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"
 674         for var_name in variants:
 675             out_c = out_c + "\t" + struct_name + "_" + var_name + "_class =\n"
 676             if self.target == Target.ANDROID:
 677                 out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"org/ldk/impl/bindings$" + struct_name + "$" + var_name + "\"));\n"
 678             else:
 679                 out_c = out_c + "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"Lorg/ldk/impl/bindings$" + struct_name + "$" + var_name + ";\"));\n"
 680             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 681             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"
 682             out_c = out_c + "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 683         out_c = out_c + "}\n"
 684         return out_c
 685
 686     def c_complex_enum_pass_ty(self, struct_name):
 687         return "jobject"
 688
 689     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 690         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 691         for param in c_params:
 692             ret = ret + ", " + param
 693         return ret + ")"
 694
 695     def native_c_map_trait(self, struct_name, field_vars, flattened_field_vars, field_fns, trait_doc_comment):
 696         out_java_trait = ""
 697         out_java = ""
 698
 699         # First generate most of the Java code, note that we need information about java method argument strings for C
 700         out_java_trait = out_java_trait + self.hu_struct_file_prefix
 701         if trait_doc_comment is not None:
 702             out_java_trait += "/**\n * " + trait_doc_comment.replace("\n", "\n * ") + "\n */\n"
 703         out_java_trait += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
 704         out_java_trait = out_java_trait + "public class " + struct_name.replace("LDK","") + " extends CommonBase {\n"
 705         out_java_trait = out_java_trait + "\tfinal bindings." + struct_name + " bindings_instance;\n"
 706         out_java_trait = out_java_trait + "\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n"
 707         out_java_trait = out_java_trait + "\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg"
 708         for var in flattened_field_vars:
 709             if isinstance(var, ConvInfo):
 710                 out_java_trait = out_java_trait + ", " + var.java_hu_ty + " " + var.arg_name
 711             else:
 712                 out_java_trait = out_java_trait + ", bindings." + var[0] + " " + var[1]
 713         out_java_trait = out_java_trait + ") {\n"
 714         out_java_trait = out_java_trait + "\t\tsuper(bindings." + struct_name + "_new(arg"
 715         for var in flattened_field_vars:
 716             if isinstance(var, ConvInfo):
 717                 if var.from_hu_conv is not None:
 718                     out_java_trait = out_java_trait + ", " + var.from_hu_conv[0]
 719                 else:
 720                     out_java_trait = out_java_trait + ", " + var.arg_name
 721             else:
 722                 out_java_trait = out_java_trait + ", " + var[1]
 723         out_java_trait = out_java_trait + "));\n"
 724         out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(arg);\n"
 725         for var in flattened_field_vars:
 726             if isinstance(var, ConvInfo):
 727                 if var.from_hu_conv is not None and var.from_hu_conv[1] != "":
 728                     out_java_trait = out_java_trait + "\t\t" + var.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n"
 729             else:
 730                 out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(" + var[1] + ");\n"
 731         out_java_trait = out_java_trait + "\t\tthis.bindings_instance = arg;\n"
 732         out_java_trait = out_java_trait + "\t}\n"
 733         out_java_trait = out_java_trait + "\t@Override @SuppressWarnings(\"deprecation\")\n"
 734         out_java_trait = out_java_trait + "\tprotected void finalize() throws Throwable {\n"
 735         out_java_trait = out_java_trait + "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n"
 736         out_java_trait = out_java_trait + "\t}\n\n"
 737
 738         java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
 739         java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 740         for var in flattened_field_vars:
 741             if isinstance(var, ConvInfo):
 742                 java_trait_constr = java_trait_constr + ", " + var.java_hu_ty + " " + var.arg_name
 743             else:
 744                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 745                 # Java-implemented version, so we require users pass a Java implementation here :/
 746                 java_trait_constr = java_trait_constr + ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 747         java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 748         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
 749         out_java_trait = out_java_trait + "\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n"
 750         out_java = out_java + "\tpublic interface " + struct_name + " {\n"
 751         java_meths = []
 752         for fn_line in field_fns:
 753             java_meth_descr = "("
 754             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 755                 out_java = out_java + "\t\t " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 756                 java_trait_constr = java_trait_constr + "\t\t\t@Override public " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 757                 out_java_trait += "\t\t/**\n\t\t * " + fn_line.docs.replace("\n", "\n\t\t * ") + "\n\t\t */\n"
 758                 out_java_trait = out_java_trait + "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_line.fn_name + "("
 759
 760                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 761                     if idx >= 1:
 762                         out_java = out_java + ", "
 763                         java_trait_constr = java_trait_constr + ", "
 764                         out_java_trait = out_java_trait + ", "
 765                     out_java = out_java + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 766                     out_java_trait = out_java_trait + arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name
 767                     java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 768                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 769                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 770                 java_meths.append((fn_line.fn_name, java_meth_descr))
 771
 772                 out_java = out_java + ");\n"
 773                 out_java_trait = out_java_trait + ");\n"
 774                 java_trait_constr = java_trait_constr + ") {\n"
 775
 776                 for arg_info in fn_line.args_ty:
 777                     if arg_info.to_hu_conv is not None:
 778                         java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 779
 780                 if fn_line.ret_ty_info.java_ty != "void":
 781                     java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 782                 else:
 783                     java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.fn_name + "("
 784
 785                 for idx, arg_info in enumerate(fn_line.args_ty):
 786                     if idx != 0:
 787                         java_trait_constr = java_trait_constr + ", "
 788                     if arg_info.to_hu_conv_name is not None:
 789                         java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
 790                     else:
 791                         java_trait_constr = java_trait_constr + arg_info.arg_name
 792
 793                 java_trait_constr = java_trait_constr + ");\n"
 794                 if fn_line.ret_ty_info.java_ty != "void":
 795                     if fn_line.ret_ty_info.from_hu_conv is not None:
 796                         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"
 797                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 798                             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"
 799                         #if fn_line.ret_ty_info.rust_obj in result_types:
 800                         java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
 801                     else:
 802                         java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
 803                 java_trait_constr = java_trait_constr + "\t\t\t}\n"
 804         java_trait_constr = java_trait_constr + "\t\t}"
 805         for var in field_vars:
 806             if isinstance(var, ConvInfo):
 807                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 808             else:
 809                 java_trait_constr += ", " + var[1] + ".new_impl(" + var[1] + "_impl"
 810                 for suparg in var[2]:
 811                     if isinstance(suparg, ConvInfo):
 812                         java_trait_constr += ", " + suparg.arg_name
 813                     else:
 814                         java_trait_constr += ", " + suparg[1]
 815                 java_trait_constr += ").bindings_instance"
 816                 for suparg in var[2]:
 817                     if isinstance(suparg, ConvInfo):
 818                         java_trait_constr += ", " + suparg.arg_name
 819                     else:
 820                         java_trait_constr += ", " + suparg[1]
 821         out_java_trait = out_java_trait + "\t}\n"
 822         out_java_trait = out_java_trait + java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 823
 824         out_java = out_java + "\t}\n"
 825
 826         out_java = out_java + "\tpublic static native long " + struct_name + "_new(" + struct_name + " impl"
 827         for var in flattened_field_vars:
 828             if isinstance(var, ConvInfo):
 829                 out_java = out_java + ", " + var.java_ty + " " + var.arg_name
 830             else:
 831                 out_java = out_java + ", " + var[0] + " " + var[1]
 832         out_java = out_java + ");\n"
 833
 834         # Now that we've written out our java code (and created java_meths), generate C
 835         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 836         out_c = out_c + "\tatomic_size_t refcnt;\n"
 837         out_c = out_c + "\tJavaVM *vm;\n"
 838         out_c = out_c + "\tjweak o;\n"
 839         for var in flattened_field_vars:
 840             if isinstance(var, ConvInfo):
 841                 # We're a regular ol' field
 842                 pass
 843             else:
 844                 # We're a supertrait
 845                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 846         for fn in field_fns:
 847             if fn.fn_name != "free" and fn.fn_name != "cloned":
 848                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 849         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 850
 851         for fn_line in field_fns:
 852             if fn_line.fn_name == "free":
 853                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 854                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 855                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 856                 out_c += "\t\t" + self.construct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 857                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 858                 out_c += "\t\t" + self.deconstruct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 859                 out_c = out_c + "\t\tFREE(j_calls);\n"
 860                 out_c = out_c + "\t}\n}\n"
 861
 862         for idx, fn_line in enumerate(field_fns):
 863             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 864                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 865                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 866                 if fn_line.self_is_const:
 867                     out_c = out_c + "const void* this_arg"
 868                 else:
 869                     out_c = out_c + "void* this_arg"
 870
 871                 for idx, arg in enumerate(fn_line.args_ty):
 872                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 873
 874                 out_c = out_c + ") {\n"
 875                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 876                 out_c += "\t" + self.construct_jenv().replace("\n", "\n\t").strip() + "\n"
 877
 878                 for arg_info in fn_line.args_ty:
 879                     if arg_info.ret_conv is not None:
 880                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 881                         out_c = out_c + arg_info.arg_name
 882                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 883
 884                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 885                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 886                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 887                 elif fn_line.ret_ty_info.c_ty == "void":
 888                     out_c += "\t(*env)->Call" + fn_line.ret_ty_info.java_ty.title() + "Method(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 889                 elif fn_line.ret_ty_info.java_ty == "String":
 890                     # Manually write out String methods as they're just an Object
 891                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 892                 elif not fn_line.ret_ty_info.passed_as_ptr:
 893                     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"
 894                 else:
 895                     out_c = out_c + "\tuint64_t ret = (*env)->CallLongMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 896
 897                 for idx, arg_info in enumerate(fn_line.args_ty):
 898                     if arg_info.ret_conv is not None:
 899                         out_c = out_c + ", " + arg_info.ret_conv_name
 900                     else:
 901                         out_c = out_c + ", " + arg_info.arg_name
 902                 out_c = out_c + ");\n"
 903
 904                 out_c += "\tif ((*env)->ExceptionCheck(env)) {\n"
 905                 out_c += "\t\t(*env)->ExceptionDescribe(env);\n"
 906                 out_c += "\t\t(*env)->FatalError(env, \"A call to " + fn_line.fn_name + " in " + struct_name + " from rust threw an exception.\");\n"
 907                 out_c += "\t}\n"
 908
 909                 if fn_line.ret_ty_info.arg_conv is not None:
 910                     out_c += "\t" + fn_line.ret_ty_info.arg_conv.replace("\n", "\n\t") + "\n"
 911                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
 912                     out_c += "\treturn " + fn_line.ret_ty_info.arg_conv_name + ";\n"
 913                 else:
 914                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
 915                     if not fn_line.ret_ty_info.passed_as_ptr and fn_line.ret_ty_info.c_ty != "void":
 916                         out_c += "\treturn ret;\n"
 917
 918                 out_c = out_c + "}\n"
 919
 920         # If we can, write out a clone function whether we need one or not, as we use them in moving to rust
 921         can_clone_with_ptr = True
 922         for var in field_vars:
 923             if isinstance(var, ConvInfo):
 924                 can_clone_with_ptr = False
 925         if can_clone_with_ptr:
 926             out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
 927             out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
 928             out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 929             for var in field_vars:
 930                 if not isinstance(var, ConvInfo):
 931                     out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 932             out_c = out_c + "}\n"
 933
 934         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 935         for var in flattened_field_vars:
 936             if isinstance(var, ConvInfo):
 937                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 938             else:
 939                 out_c = out_c + ", jobject " + var[1]
 940         out_c = out_c + ") {\n"
 941
 942         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 943         out_c = out_c + "\tCHECK(c != NULL);\n"
 944         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 945         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 946         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 947         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 948
 949         for (fn_name, java_meth_descr) in java_meths:
 950             if fn_name != "free" and fn_name != "cloned":
 951                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 952                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 953
 954         for var in flattened_field_vars:
 955             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 956                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 957         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 958         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 959         for fn_line in field_fns:
 960             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 961                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 962             elif fn_line.fn_name == "free":
 963                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 964             else:
 965                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
 966         for var in field_vars:
 967             if isinstance(var, ConvInfo):
 968                 if var.arg_conv_name is not None:
 969                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 970                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 971                 else:
 972                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 973                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 974             else:
 975                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1]
 976                 for suparg in var[2]:
 977                     if isinstance(suparg, ConvInfo):
 978                         out_c = out_c + ", " + suparg.arg_name
 979                     else:
 980                         out_c = out_c + ", " + suparg[1]
 981                 out_c += "),\n"
 982         out_c = out_c + "\t};\n"
 983         for var in flattened_field_vars:
 984             if not isinstance(var, ConvInfo):
 985                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 986         out_c = out_c + "\treturn ret;\n"
 987         out_c = out_c + "}\n"
 988
 989         out_c = out_c + self.c_fn_ty_pfx + "int64_t " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "jobject o"
 990         for var in flattened_field_vars:
 991             if isinstance(var, ConvInfo):
 992                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 993             else:
 994                 out_c = out_c + ", jobject " + var[1]
 995         out_c = out_c + ") {\n"
 996         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 997         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 998         for var in flattened_field_vars:
 999             if isinstance(var, ConvInfo):
1000                 out_c = out_c + ", " + var.arg_name
1001             else:
1002                 out_c = out_c + ", " + var[1]
1003         out_c = out_c + ");\n"
1004         out_c = out_c + "\treturn (uint64_t)res_ptr;\n"
1005         out_c = out_c + "}\n"
1006
1007         for var in flattened_field_vars:
1008             if not isinstance(var, ConvInfo):
1009                 out_java_trait += "\n\t/**\n"
1010                 out_java_trait += "\t * Gets the underlying " + var[1] + ".\n"
1011                 out_java_trait += "\t */\n"
1012                 underscore_name = ''.join('_' + c.lower() if c.isupper() else c for c in var[1]).strip('_')
1013                 out_java_trait += "\tpublic " + var[1] + " get_" + underscore_name + "() {\n"
1014                 out_java_trait += "\t\t" + var[1] + " res = new " + var[1] + "(null, bindings." + struct_name + "_get_" + var[1] + "(this.ptr));\n"
1015                 out_java_trait += "\t\tthis.ptrs_to.add(res);\n"
1016                 out_java_trait += "\t\treturn res;\n"
1017                 out_java_trait += "\t}\n"
1018                 out_java_trait += "\n"
1019
1020                 out_java += "\tpublic static native long " + struct_name + "_get_" + var[1] + "(long arg);\n"
1021
1022                 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"
1023                 out_c += "\t" + struct_name + " *inp = (" + struct_name + " *)(arg & ~1);\n"
1024                 out_c += "\tuint64_t res_ptr = (uint64_t)&inp->" + var[1] + ";\n"
1025                 out_c += "\tDO_ASSERT((res_ptr & 1) == 0);\n"
1026                 out_c += "\treturn (int64_t)(res_ptr | 1);\n"
1027                 out_c += "}\n"
1028
1029         return (out_java, out_java_trait, out_c)
1030
1031     def trait_struct_inc_refcnt(self, ty_info):
1032         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
1033         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
1034         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_cloned(&" + ty_info.var_name + "_conv);\n}"
1035         return base_conv
1036
1037     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
1038         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
1039         out_java_enum = ""
1040         out_java = ""
1041         out_c = ""
1042
1043         out_java_enum += (self.hu_struct_file_prefix)
1044         out_java_enum += "\n/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
1045         out_java_enum += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
1046         out_java_enum += ("public class " + java_hu_type + " extends CommonBase {\n")
1047         out_java_enum += ("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
1048         out_java_enum += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
1049         out_java_enum += ("\tprotected void finalize() throws Throwable {\n")
1050         out_java_enum += ("\t\tsuper.finalize();\n")
1051         out_java_enum += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK", "") + "_free(ptr); }\n")
1052         out_java_enum += ("\t}\n")
1053         out_java_enum += ("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
1054         out_java_enum += ("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
1055         java_hu_subclasses = ""
1056
1057         init_meth_jty_strs = {}
1058
1059         out_java +=  ("\tpublic static class " + struct_name + " {\n")
1060         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
1061         for var in variant_list:
1062             out_java +=  ("\t\tpublic final static class " + var.var_name + " extends " + struct_name + " {\n")
1063             if var.var_docs is not None:
1064                 java_hu_subclasses += "\t/**\n\t * " + var.var_docs.replace("\n", "\n\t * ") + "\n\t */\n"
1065             java_hu_subclasses += "\tpublic final static class " + var.var_name + " extends " + java_hu_type + " {\n"
1066             out_java_enum += ("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var.var_name + ".class) {\n")
1067             out_java_enum += ("\t\t\treturn new " + var.var_name + "(ptr, (bindings." + struct_name + "." + var.var_name + ")raw_val);\n")
1068             init_meth_jty_str = ""
1069             init_meth_params = ""
1070             init_meth_body = ""
1071             hu_conv_body = ""
1072             for idx, (field_ty, field_docs) in enumerate(var.fields):
1073                 if idx > 0:
1074                     init_meth_params = init_meth_params + ", "
1075
1076                 if field_ty.java_hu_ty == var.var_name:
1077                     field_path = field_ty.java_fn_ty_arg.strip("L;").replace("/", ".")
1078                     out_java += "\t\t\tpublic " + field_path + " " + field_ty.arg_name + ";\n"
1079                     java_hu_subclasses = java_hu_subclasses + "\t\tpublic final " + field_path + " " + field_ty.arg_name + ";\n"
1080                     init_meth_params = init_meth_params + field_path + " " + field_ty.arg_name
1081                 else:
1082                     out_java += "\t\t\tpublic " + field_ty.java_ty + " " + field_ty.arg_name + ";\n"
1083                     if field_docs is not None:
1084                         java_hu_subclasses += "\t\t/**\n\t\t * " + field_docs.replace("\n", "\n\t\t * ") + "\n\t\t*/\n"
1085                     java_hu_subclasses += "\t\t"
1086                     if field_ty.nullable:
1087                         java_hu_subclasses += "@Nullable "
1088                     java_hu_subclasses += "public final " + field_ty.java_hu_ty + " " + field_ty.arg_name + ";\n"
1089                     init_meth_params = init_meth_params + field_ty.java_ty + " " + field_ty.arg_name
1090                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
1091                 if field_ty.to_hu_conv is not None:
1092                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1093                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1094                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1095                 else:
1096                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1097                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
1098             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
1099             out_java +=  (init_meth_body)
1100             out_java +=  ("}\n")
1101             out_java += ("\t\t}\n")
1102             out_java_enum += ("\t\t}\n")
1103             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"
1104             java_hu_subclasses = java_hu_subclasses + hu_conv_body
1105             java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
1106             init_meth_jty_strs[var.var_name] = init_meth_jty_str
1107         out_java += ("\t\tstatic native void init();\n")
1108         out_java += ("\t}\n")
1109         out_java_enum += ("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
1110         out_java_enum += (java_hu_subclasses)
1111         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
1112         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
1113
1114         out_c += (self.c_complex_enum_pfx(struct_name, [x.var_name for x in variant_list], init_meth_jty_strs))
1115
1116         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")
1117         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n")
1118         out_c += ("\tswitch(obj->tag) {\n")
1119         for var in variant_list:
1120             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
1121             c_params = []
1122             for idx, (field_map, field_docs) in enumerate(var.fields):
1123                 if field_map.ret_conv is not None:
1124                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1125                     if var.tuple_variant:
1126                         out_c += "obj->" + camel_to_snake(var.var_name)
1127                     else:
1128                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
1129                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1130                     c_params.append(field_map.ret_conv_name)
1131                 else:
1132                     if var.tuple_variant:
1133                         c_params.append("obj->" + camel_to_snake(var.var_name))
1134                     else:
1135                         c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
1136             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
1137             out_c += ("\t\t}\n")
1138         out_c += ("\t\tdefault: abort();\n")
1139         out_c += ("\t}\n}\n")
1140         return (out_java, out_java_enum, out_c)
1141
1142     def map_opaque_struct(self, struct_name, struct_doc_comment):
1143         out_opaque_struct_human = ""
1144         out_opaque_struct_human += self.hu_struct_file_prefix
1145         out_opaque_struct_human += "\n/**\n * " + struct_doc_comment.replace("\n", "\n * ") + "\n */\n"
1146         out_opaque_struct_human += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
1147         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
1148         out_opaque_struct_human += ("public class " + hu_name + " extends CommonBase")
1149         if struct_name.startswith("LDKLocked"):
1150             out_opaque_struct_human += (" implements AutoCloseable")
1151         out_opaque_struct_human += (" {\n")
1152         out_opaque_struct_human += ("\t" + hu_name + "(Object _dummy, long ptr) { super(ptr); }\n")
1153         if struct_name.startswith("LDKLocked"):
1154             out_opaque_struct_human += ("\t@Override public void close() {\n")
1155         else:
1156             out_opaque_struct_human += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
1157             out_opaque_struct_human += ("\tprotected void finalize() throws Throwable {\n")
1158             out_opaque_struct_human += ("\t\tsuper.finalize();\n")
1159         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
1160         out_opaque_struct_human += ("\t}\n\n")
1161         return out_opaque_struct_human
1162
1163     def map_tuple(self, struct_name):
1164         return self.map_opaque_struct(struct_name, "A Tuple")
1165
1166     def map_function(self, argument_types, c_call_string, method_name, meth_n, return_type_info, struct_meth, default_constructor_args, takes_self, takes_self_as_ref, args_known, type_mapping_generator, doc_comment):
1167         out_java = ""
1168         out_c = ""
1169         out_java_struct = None
1170
1171         out_java += ("\tpublic static native ")
1172         out_c += (self.c_fn_ty_pfx)
1173         out_c += (return_type_info.c_ty)
1174         out_java += (return_type_info.java_ty)
1175         if return_type_info.ret_conv is not None:
1176             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1177         out_java += (" " + method_name + "(")
1178         have_args = len(argument_types) > 1 or (len(argument_types) > 0 and argument_types[0].c_ty != "void")
1179         out_c += (" " + self.c_fn_name_define_pfx(method_name, have_args))
1180
1181         for idx, arg_conv_info in enumerate(argument_types):
1182             if idx != 0:
1183                 out_java += (", ")
1184                 out_c += (", ")
1185             if arg_conv_info.c_ty != "void":
1186                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1187                 out_java += (arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
1188
1189         out_java_struct = ""
1190         if not args_known:
1191             out_java_struct += ("\t// Skipped " + method_name + "\n")
1192         else:
1193             if doc_comment is not None:
1194                 out_java_struct += "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
1195             if return_type_info.nullable:
1196                 out_java_struct += "\t@Nullable\n"
1197             if not takes_self:
1198                 if meth_n == "new":
1199                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " of("
1200                 elif meth_n == "default":
1201                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " with_default("
1202                 else:
1203                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " " + meth_n + "("
1204             else:
1205                 out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
1206             for idx, arg in enumerate(argument_types):
1207                 if idx != 0:
1208                     if not takes_self or idx > 1:
1209                         out_java_struct += ", "
1210                 elif takes_self:
1211                     continue
1212                 if arg.java_ty != "void":
1213                     if arg.arg_name in default_constructor_args:
1214                         assert not arg.nullable
1215                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1216                             if explode_idx != 0:
1217                                 out_java_struct += (", ")
1218                             out_java_struct += (
1219                                 explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
1220                     else:
1221                         if arg.nullable:
1222                             out_java_struct += "@Nullable "
1223                         ty_string = arg.java_hu_ty
1224                         if arg.java_fn_ty_arg[0] == "L" and arg.java_fn_ty_arg[len(arg.java_fn_ty_arg) - 1] == ";":
1225                             ty_string = arg.java_fn_ty_arg.strip("L;").replace("/", ".")
1226                         out_java_struct += ty_string + " " + arg.arg_name
1227         out_java += (");\n")
1228         out_c += (") {\n")
1229         if out_java_struct is not None:
1230             out_java_struct += (") {\n")
1231         for info in argument_types:
1232             if info.arg_conv is not None:
1233                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1234         if return_type_info.ret_conv is not None:
1235             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1236         elif return_type_info.c_ty != "void":
1237             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1238         else:
1239             out_c += ("\t")
1240         if c_call_string is None:
1241             out_c += (method_name + "(")
1242         else:
1243             out_c += (c_call_string)
1244         for idx, info in enumerate(argument_types):
1245             if info.arg_conv_name is not None:
1246                 if idx != 0:
1247                     out_c += (", ")
1248                 elif c_call_string is not None:
1249                     continue
1250                 out_c += (info.arg_conv_name)
1251         out_c += (")")
1252         if return_type_info.ret_conv is not None:
1253             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1254         else:
1255             out_c += (";")
1256         for info in argument_types:
1257             if info.arg_conv_cleanup is not None:
1258                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1259         if return_type_info.ret_conv is not None:
1260             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1261         elif return_type_info.c_ty != "void":
1262             out_c += ("\n\treturn ret_val;")
1263         out_c += ("\n}\n\n")
1264
1265         if args_known:
1266             out_java_struct += ("\t\t")
1267             if return_type_info.java_ty != "void":
1268                 out_java_struct += (return_type_info.java_ty + " ret = ")
1269             out_java_struct += ("bindings." + method_name + "(")
1270             for idx, info in enumerate(argument_types):
1271                 if idx != 0:
1272                     out_java_struct += (", ")
1273                 if idx == 0 and takes_self:
1274                     out_java_struct += ("this.ptr")
1275                 elif info.arg_name in default_constructor_args:
1276                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1277                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1278                         if explode_idx != 0:
1279                             out_java_struct += (", ")
1280                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1281                         if explode_arg.from_hu_conv is not None:
1282                             out_java_struct += (
1283                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1284                         else:
1285                             out_java_struct += (expl_arg_name)
1286                     out_java_struct += (")")
1287                 elif info.from_hu_conv is not None:
1288                     out_java_struct += (info.from_hu_conv[0])
1289                 else:
1290                     out_java_struct += (info.arg_name)
1291             out_java_struct += (");\n")
1292             if return_type_info.java_ty == "long" and return_type_info.java_hu_ty != "long":
1293                 out_java_struct += "\t\tif (ret >= 0 && ret <= 4096) { return null; }\n"
1294
1295             if return_type_info.to_hu_conv is not None:
1296                 if not takes_self:
1297                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1298                                                                                                                return_type_info.to_hu_conv_name) + "\n")
1299                 else:
1300                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1301
1302             for idx, info in enumerate(argument_types):
1303                 if idx == 0 and takes_self:
1304                     pass
1305                 elif info.arg_name in default_constructor_args:
1306                     for explode_arg in default_constructor_args[info.arg_name]:
1307                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1308                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1309                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1310                                                                                                expl_arg_name).replace(
1311                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1312                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1313                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1314                         out_java_struct += (
1315                             "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1316                     else:
1317                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1318
1319             if takes_self and not takes_self_as_ref:
1320                 out_java_struct += "\t\t" + argument_types[0].from_hu_conv[1].replace("\n", "\n\t\t").replace("this_arg", "this") + ";\n"
1321             if return_type_info.to_hu_conv_name is not None:
1322                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1323             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1324                 out_java_struct += ("\t\treturn ret;\n")
1325             out_java_struct += ("\t}\n\n")
1326
1327         return (out_java, out_c, out_java_struct)