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