_ 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         self.java_type_map = dict(
  20             String = "String"
  21         )
  22         self.java_hu_type_map = dict(
  23             String = "String"
  24         )
  25
  26         self.to_hu_conv_templates = dict(
  27             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}); }',
  28             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}); }'
  29         )
  30
  31         self.bindings_header = """package org.ldk.impl;
  32 import org.ldk.enums.*;
  33 import org.ldk.impl.version;
  34 import java.io.File;
  35 import java.io.InputStream;
  36 import java.io.IOException;
  37 import java.nio.file.Files;
  38 import java.nio.file.Path;
  39 import java.nio.file.StandardCopyOption;
  40
  41 public class bindings {
  42         public static class VecOrSliceDef {
  43                 public long dataptr;
  44                 public long datalen;
  45                 public long stride;
  46                 public VecOrSliceDef(long dataptr, long datalen, long stride) {
  47                         this.dataptr = dataptr; this.datalen = datalen; this.stride = stride;
  48                 }
  49         }
  50         static {
  51                 try {
  52                         // Try to load natively first, this works on Android and in testing.
  53                         System.loadLibrary(\"lightningjni\");
  54                 } catch (UnsatisfiedLinkError system_load_err) {
  55                         // Otherwise try to load from the library jar.
  56                         File tmpdir = new File(System.getProperty("java.io.tmpdir"), "ldk-java-nativelib");
  57                         tmpdir.mkdir(); // If it fails to create, assume it was there already
  58                         tmpdir.deleteOnExit();
  59                         String libname = "liblightningjni_" + System.getProperty("os.name").replaceAll(" ", "") +
  60                                 "-" + System.getProperty("os.arch").replaceAll(" ", "") + ".nativelib";
  61                         try (InputStream is = bindings.class.getResourceAsStream("/" + libname)) {
  62                                 Path libpath = new File(tmpdir.toPath().toString(), "liblightningjni.so").toPath();
  63                                 Files.copy(is, libpath, StandardCopyOption.REPLACE_EXISTING);
  64                                 Runtime.getRuntime().load(libpath.toString());
  65                         } catch (Exception e) {
  66                                 System.err.println("Failed to load LDK native library.");
  67                                 System.err.println("System LDK native library load failed with: " + system_load_err);
  68                                 System.err.println("Resource-based LDK native library load failed with: " + e);
  69                                 throw new IllegalArgumentException(e);
  70                         }
  71                 }
  72                 init(java.lang.Enum.class, VecOrSliceDef.class);
  73                 init_class_cache();
  74                 if (!get_lib_version_string().equals(version.get_ldk_java_bindings_version()))
  75                         throw new IllegalArgumentException("Compiled LDK library and LDK class failes do not match");
  76                 // Fetching the LDK versions from C also checks that the header and binaries match
  77                 System.err.println("Loaded LDK-Java Bindings " + version.get_ldk_java_bindings_version() + " with LDK " + get_ldk_version() + " and LDK-C-Bindings " + get_ldk_c_bindings_version());
  78         }
  79         static native void init(java.lang.Class c, java.lang.Class slicedef);
  80         static native void init_class_cache();
  81         static native String get_lib_version_string();
  82
  83         public static native String get_ldk_c_bindings_version();
  84         public static native String get_ldk_version();
  85
  86         public static native boolean deref_bool(long ptr);
  87         public static native long deref_long(long ptr);
  88         public static native void free_heap_ptr(long ptr);
  89         public static native byte[] read_bytes(long ptr, long len);
  90         public static native byte[] get_u8_slice_bytes(long slice_ptr);
  91         public static native long bytes_to_u8_vec(byte[] bytes);
  92         public static native long new_txpointer_copy_data(byte[] txdata);
  93         public static native void txpointer_free(long ptr);
  94         public static native byte[] txpointer_get_buffer(long ptr);
  95         public static native long vec_slice_len(long vec);
  96         public static native long new_empty_slice_vec();
  97
  98 """
  99         self.bindings_version_file = """package org.ldk.impl;
 100
 101 public class version {
 102         public static String get_ldk_java_bindings_version() {
 103                 return "<git_version_ldk_garbagecollected>";
 104         }
 105 }"""
 106
 107         self.bindings_footer = "}\n"
 108
 109         self.util_fn_pfx = """package org.ldk.structs;
 110 import org.ldk.impl.bindings;
 111 import org.ldk.enums.*;
 112 import org.ldk.util.*;
 113 import java.util.Arrays;
 114 import java.lang.ref.Reference;
 115 import javax.annotation.Nullable;
 116
 117 public class UtilMethods {
 118 """
 119         self.util_fn_sfx = "}"
 120         self.common_base = """package org.ldk.structs;
 121 import java.util.LinkedList;
 122 class CommonBase {
 123         long ptr;
 124         LinkedList<Object> ptrs_to = new LinkedList();
 125         protected CommonBase(long ptr) { assert ptr < 0 || ptr > 4096; this.ptr = ptr; }
 126 }
 127 """
 128
 129         self.txout_defn = """public class TxOut extends CommonBase {
 130         /** The script_pubkey in this output */
 131         public final byte[] script_pubkey;
 132         /** The value, in satoshis, of this output */
 133         public final long value;
 134
 135         TxOut(java.lang.Object _dummy, long ptr) {
 136                 super(ptr);
 137                 this.script_pubkey = bindings.TxOut_get_script_pubkey(ptr);
 138                 this.value = bindings.TxOut_get_value(ptr);
 139         }
 140         public TxOut(long value, byte[] script_pubkey) {
 141                 super(bindings.TxOut_new(script_pubkey, value));
 142                 this.script_pubkey = bindings.TxOut_get_script_pubkey(ptr);
 143                 this.value = bindings.TxOut_get_value(ptr);
 144         }
 145
 146         @Override @SuppressWarnings(\"deprecation\")
 147         protected void finalize() throws Throwable {
 148                 super.finalize();
 149                 if (ptr != 0) { bindings.TxOut_free(ptr); }
 150         }
 151 }"""
 152
 153         self.scalar_defn = """public class BigEndianScalar extends CommonBase {
 154         /** The bytes of the scalar value, in big endian */
 155         public final byte[] scalar_bytes;
 156
 157         BigEndianScalar(java.lang.Object _dummy, long ptr) {
 158                 super(ptr);
 159                 this.scalar_bytes = bindings.BigEndianScalar_get_bytes(ptr);
 160         }
 161         public BigEndianScalar(byte[] scalar_bytes) {
 162                 super(bindings.BigEndianScalar_new(scalar_bytes));
 163                 this.scalar_bytes = bindings.BigEndianScalar_get_bytes(ptr);
 164         }
 165
 166         @Override @SuppressWarnings(\"deprecation\")
 167         protected void finalize() throws Throwable {
 168                 super.finalize();
 169                 if (ptr != 0) { bindings.BigEndianScalar_free(ptr); }
 170         }
 171 }"""
 172
 173
 174         self.c_file_pfx = """#include <jni.h>
 175 // On OSX jlong (ie long long) is not equivalent to int64_t, so we override here
 176 #define int64_t jlong
 177 #include \"org_ldk_impl_bindings.h\"
 178 #include <lightning.h>
 179 #include <string.h>
 180 #include <stdatomic.h>
 181 #include <stdlib.h>
 182
 183 #define LIKELY(v) __builtin_expect(!!(v), 1)
 184 #define UNLIKELY(v) __builtin_expect(!!(v), 0)
 185
 186 """
 187
 188         if self.target == Target.ANDROID:
 189             self.c_file_pfx = self.c_file_pfx + """
 190 #include <android/log.h>
 191 #define DEBUG_PRINT(...) __android_log_print(ANDROID_LOG_ERROR, "LDK", __VA_ARGS__)
 192
 193 #include <unistd.h>
 194 #include <pthread.h>
 195 static void* redirect_stderr(void* ignored) {
 196         int pipes[2];
 197         pipe(pipes);
 198         dup2(pipes[1], STDERR_FILENO);
 199         char buf[8192];
 200         memset(buf, 0, 8192);
 201         ssize_t len;
 202         while ((len = read(pipes[0], buf, 8191)) > 0) {
 203                 DEBUG_PRINT("%s\\n", buf);
 204                 memset(buf, 0, 8192);
 205         }
 206         DEBUG_PRINT("End of stderr???\\n");
 207         return 0;
 208 }
 209 void __attribute__((constructor)) spawn_stderr_redirection() {
 210         pthread_t thread;
 211         pthread_create(&thread, NULL, &redirect_stderr, NULL);
 212 }
 213 """
 214         else:
 215             self.c_file_pfx = self.c_file_pfx + "#define DEBUG_PRINT(...) fprintf(stderr, __VA_ARGS__)\n"
 216
 217         if not DEBUG or sys.platform == "darwin":
 218             self.c_file_pfx = self.c_file_pfx + """#define MALLOC(a, _) malloc(a)
 219 #define FREE(p) if ((uint64_t)(p) > 4096) { free(p); }
 220 #define CHECK_ACCESS(p)
 221 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v)
 222 """
 223         if not DEBUG:
 224             self.c_file_pfx += """#define DO_ASSERT(a) (void)(a)
 225 #define CHECK(a)
 226 """
 227         if DEBUG:
 228             self.c_file_pfx = self.c_file_pfx + """#include <assert.h>
 229 // Always run a, then assert it is true:
 230 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 231 // Assert a is true or do nothing
 232 #define CHECK(a) DO_ASSERT(a)
 233
 234 void __attribute__((constructor)) debug_log_version() {
 235         if (check_get_ldk_version() == NULL)
 236                 DEBUG_PRINT("LDK version did not match the header we built against\\n");
 237         if (check_get_ldk_bindings_version() == NULL)
 238                 DEBUG_PRINT("LDK C Bindings version did not match the header we built against\\n");
 239 }
 240 """
 241
 242             if sys.platform != "darwin":
 243                 self.c_file_pfx += """
 244 // Running a leak check across all the allocations and frees of the JDK is a mess,
 245 // so instead we implement our own naive leak checker here, relying on the -wrap
 246 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 247 // and free'd in Rust or C across the generated bindings shared library.
 248 #include <threads.h>
 249 """
 250
 251                 if self.target == Target.ANDROID:
 252                     self.c_file_pfx = self.c_file_pfx + """
 253 #include <unwind.h>
 254 #include <dlfcn.h>
 255
 256 // Implement the execinfo functions using _Unwind_backtrace. This seems to miss many Rust
 257 // symbols, so we only use it on Android, where execinfo.h is unavailable.
 258
 259 struct BacktraceState {
 260         void** current;
 261         void** end;
 262 };
 263 static _Unwind_Reason_Code unwind_callback(struct _Unwind_Context* context, void* arg) {
 264         struct BacktraceState* state = (struct BacktraceState*)arg;
 265         uintptr_t pc = _Unwind_GetIP(context);
 266         if (pc) {
 267                 if (state->current == state->end) {
 268                         return _URC_END_OF_STACK;
 269                 } else {
 270                         *state->current++ = (void*)(pc);
 271                 }
 272         }
 273         return _URC_NO_REASON;
 274 }
 275
 276 int backtrace(void** buffer, int max) {
 277         struct BacktraceState state = { buffer, buffer + max };
 278         _Unwind_Backtrace(unwind_callback, &state);
 279         return state.current - buffer;
 280 }
 281
 282 void backtrace_symbols_fd(void ** buffer, int count, int _fd) {
 283         for (int idx = 0; idx < count; ++idx) {
 284                 Dl_info info;
 285                 if (dladdr(buffer[idx], &info) && info.dli_sname) {
 286                         DEBUG_PRINT("%p: %s", buffer[idx], info.dli_sname);
 287                 } else {
 288                         DEBUG_PRINT("%p: ???", buffer[idx]);
 289                 }
 290         }
 291 }
 292 """
 293                 else:
 294                     self.c_file_pfx = self.c_file_pfx + "#include <execinfo.h>\n"
 295                 self.c_file_pfx = self.c_file_pfx + """
 296 #include <unistd.h>
 297 #include <pthread.h>
 298 static pthread_mutex_t allocation_mtx;
 299
 300 void __attribute__((constructor)) init_mtx() {
 301         DO_ASSERT(!pthread_mutex_init(&allocation_mtx, NULL));
 302 }
 303
 304 #define BT_MAX 128
 305 typedef struct allocation {
 306         struct allocation* next;
 307         void* ptr;
 308         const char* struct_name;
 309         void* bt[BT_MAX];
 310         int bt_len;
 311         unsigned long alloc_len;
 312 } allocation;
 313 static allocation* allocation_ll = NULL;
 314
 315 void* __real_malloc(size_t len);
 316 void* __real_calloc(size_t nmemb, size_t len);
 317 static void new_allocation(void* res, const char* struct_name, size_t len) {
 318         allocation* new_alloc = __real_malloc(sizeof(allocation));
 319         new_alloc->ptr = res;
 320         new_alloc->struct_name = struct_name;
 321         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 322         new_alloc->alloc_len = len;
 323         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 324         new_alloc->next = allocation_ll;
 325         allocation_ll = new_alloc;
 326         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 327 }
 328 static void* MALLOC(size_t len, const char* struct_name) {
 329         void* res = __real_malloc(len);
 330         new_allocation(res, struct_name, len);
 331         return res;
 332 }
 333 void __real_free(void* ptr);
 334 static void alloc_freed(void* ptr) {
 335         allocation* p = NULL;
 336         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 337         allocation* it = allocation_ll;
 338         while (it->ptr != ptr) {
 339                 p = it; it = it->next;
 340                 if (it == NULL) {
 341                         DEBUG_PRINT("ERROR: Tried to free unknown pointer %p at:\\n", ptr);
 342                         void* bt[BT_MAX];
 343                         int bt_len = backtrace(bt, BT_MAX);
 344                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 345                         DEBUG_PRINT("\\n\\n");
 346                         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 347                         return; // addrsan should catch malloc-unknown and print more info than we have
 348                 }
 349         }
 350         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 351         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 352         DO_ASSERT(it->ptr == ptr);
 353         __real_free(it);
 354 }
 355 static void FREE(void* ptr) {
 356         if ((uint64_t)ptr <= 4096) return; // Rust loves to create pointers to the NULL page for dummys
 357         alloc_freed(ptr);
 358         __real_free(ptr);
 359 }
 360
 361 void* __wrap_malloc(size_t len) {
 362         void* res = __real_malloc(len);
 363         new_allocation(res, "malloc call", len);
 364         return res;
 365 }
 366 void* __wrap_calloc(size_t nmemb, size_t len) {
 367         void* res = __real_calloc(nmemb, len);
 368         new_allocation(res, "calloc call", len);
 369         return res;
 370 }
 371 void __wrap_free(void* ptr) {
 372         if (ptr == NULL) return;
 373         alloc_freed(ptr);
 374         __real_free(ptr);
 375 }
 376
 377 static void CHECK_ACCESS(const void* ptr) {
 378         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 379         allocation* it = allocation_ll;
 380         while (it->ptr != ptr) {
 381                 it = it->next;
 382                 if (it == NULL) {
 383                         DEBUG_PRINT("ERROR: Tried to access unknown pointer %p at:\\n", ptr);
 384                         void* bt[BT_MAX];
 385                         int bt_len = backtrace(bt, BT_MAX);
 386                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 387                         DEBUG_PRINT("\\n\\n");
 388                         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 389                         return; // addrsan should catch and print more info than we have
 390                 }
 391         }
 392         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 393 }
 394 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v) \\
 395         if (v.is_owned && v.inner != NULL) { \\
 396                 const void *p = __unmangle_inner_ptr(v.inner); \\
 397                 if (p != NULL) { \\
 398                         CHECK_ACCESS(p); \\
 399                 } \\
 400         }
 401
 402 void* __real_realloc(void* ptr, size_t newlen);
 403 void* __wrap_realloc(void* ptr, size_t len) {
 404         if (ptr != NULL) alloc_freed(ptr);
 405         void* res = __real_realloc(ptr, len);
 406         new_allocation(res, "realloc call", len);
 407         return res;
 408 }
 409 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 410         // Rust doesn't seem to use reallocarray currently
 411         DO_ASSERT(false);
 412 }
 413
 414 void __attribute__((destructor)) check_leaks() {
 415         unsigned long alloc_count = 0;
 416         unsigned long alloc_size = 0;
 417         DEBUG_PRINT("The following LDK-allocated blocks still remain.\\n");
 418         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 419         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 420         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 421                 DEBUG_PRINT("%s %p (%lu bytes) remains:\\n", a->struct_name, a->ptr, a->alloc_len);
 422                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 423                 DEBUG_PRINT("\\n\\n");
 424                 alloc_count++;
 425                 alloc_size += a->alloc_len;
 426         }
 427         DEBUG_PRINT("%lu allocations remained for %lu bytes.\\n", alloc_count, alloc_size);
 428         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 429         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 430 }
 431 """
 432         self.c_file_pfx = self.c_file_pfx + """
 433 static jmethodID ordinal_meth = NULL;
 434 static jmethodID slicedef_meth = NULL;
 435 static jclass slicedef_cls = NULL;
 436 JNIEXPORT void Java_org_ldk_impl_bindings_init(JNIEnv * env, jclass _b, jclass enum_class, jclass slicedef_class) {
 437         ordinal_meth = (*env)->GetMethodID(env, enum_class, "ordinal", "()I");
 438         CHECK(ordinal_meth != NULL);
 439         slicedef_meth = (*env)->GetMethodID(env, slicedef_class, "<init>", "(JJJ)V");
 440         CHECK(slicedef_meth != NULL);
 441         slicedef_cls = (*env)->NewGlobalRef(env, slicedef_class);
 442         CHECK(slicedef_cls != NULL);
 443 }
 444
 445 JNIEXPORT jboolean JNICALL Java_org_ldk_impl_bindings_deref_1bool (JNIEnv * env, jclass _a, jlong ptr) {
 446         return *((bool*)ptr);
 447 }
 448 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_deref_1long (JNIEnv * env, jclass _a, jlong ptr) {
 449         return *((long*)ptr);
 450 }
 451 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_free_1heap_1ptr (JNIEnv * env, jclass _a, jlong ptr) {
 452         FREE((void*)ptr);
 453 }
 454 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_read_1bytes (JNIEnv * env, jclass _b, jlong ptr, jlong len) {
 455         jbyteArray ret_arr = (*env)->NewByteArray(env, len);
 456         (*env)->SetByteArrayRegion(env, ret_arr, 0, len, (unsigned char*)ptr);
 457         return ret_arr;
 458 }
 459 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes (JNIEnv * env, jclass _b, jlong slice_ptr) {
 460         LDKu8slice *slice = (LDKu8slice*)slice_ptr;
 461         jbyteArray ret_arr = (*env)->NewByteArray(env, slice->datalen);
 462         (*env)->SetByteArrayRegion(env, ret_arr, 0, slice->datalen, slice->data);
 463         return ret_arr;
 464 }
 465 JNIEXPORT int64_t impl_bindings_bytes_1to_1u8_1vec (JNIEnv * env, jclass _b, jbyteArray bytes) {
 466         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "LDKCVec_u8");
 467         vec->datalen = (*env)->GetArrayLength(env, bytes);
 468         vec->data = (uint8_t*)MALLOC(vec->datalen, "LDKCVec_u8Z Bytes");
 469         (*env)->GetByteArrayRegion (env, bytes, 0, vec->datalen, vec->data);
 470         return (uint64_t)vec;
 471 }
 472 JNIEXPORT jbyteArray JNICALL Java_org_ldk_impl_bindings_txpointer_1get_1buffer (JNIEnv * env, jclass _b, jlong ptr) {
 473         LDKTransaction *txdata = (LDKTransaction*)ptr;
 474         LDKu8slice slice;
 475         slice.data = txdata->data;
 476         slice.datalen = txdata->datalen;
 477         return Java_org_ldk_impl_bindings_get_1u8_1slice_1bytes(env, _b, (uint64_t)&slice);
 478 }
 479 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1txpointer_1copy_1data (JNIEnv * env, jclass _b, jbyteArray bytes) {
 480         LDKTransaction *txdata = (LDKTransaction*)MALLOC(sizeof(LDKTransaction), "LDKTransaction");
 481         txdata->datalen = (*env)->GetArrayLength(env, bytes);
 482         txdata->data = (uint8_t*)MALLOC(txdata->datalen, "Tx Data Bytes");
 483         txdata->data_is_owned = false;
 484         (*env)->GetByteArrayRegion (env, bytes, 0, txdata->datalen, txdata->data);
 485         return (uint64_t)txdata;
 486 }
 487 JNIEXPORT void JNICALL Java_org_ldk_impl_bindings_txpointer_1free (JNIEnv * env, jclass _b, jlong ptr) {
 488         LDKTransaction *tx = (LDKTransaction*)ptr;
 489         tx->data_is_owned = true;
 490         Transaction_free(*tx);
 491         FREE((void*)ptr);
 492 }
 493 JNIEXPORT jlong JNICALL Java_org_ldk_impl_bindings_vec_1slice_1len (JNIEnv * env, jclass _a, jlong ptr) {
 494         // Check offsets of a few Vec types are all consistent as we're meant to be generic across types
 495         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_SignatureZ, datalen), "Vec<*> needs to be mapped identically");
 496         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_MessageSendEventZ, datalen), "Vec<*> needs to be mapped identically");
 497         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_EventZ, datalen), "Vec<*> needs to be mapped identically");
 498         _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKCVec_C2Tuple_usizeTransactionZZ, datalen), "Vec<*> needs to be mapped identically");
 499         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)ptr;
 500         return (uint64_t)vec->datalen;
 501 }
 502 JNIEXPORT int64_t JNICALL Java_org_ldk_impl_bindings_new_1empty_1slice_1vec (JNIEnv * env, jclass _b) {
 503         // Check sizes of a few Vec types are all consistent as we're meant to be generic across types
 504         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_SignatureZ), "Vec<*> needs to be mapped identically");
 505         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_MessageSendEventZ), "Vec<*> needs to be mapped identically");
 506         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_EventZ), "Vec<*> needs to be mapped identically");
 507         _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKCVec_C2Tuple_usizeTransactionZZ), "Vec<*> needs to be mapped identically");
 508         LDKCVec_u8Z *vec = (LDKCVec_u8Z*)MALLOC(sizeof(LDKCVec_u8Z), "Empty LDKCVec");
 509         vec->data = NULL;
 510         vec->datalen = 0;
 511         return (uint64_t)vec;
 512 }
 513
 514 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 515 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 516 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 517 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 518
 519 _Static_assert(sizeof(jlong) == sizeof(int64_t), "We assume that j-types are the same as C types");
 520 _Static_assert(sizeof(jbyte) == sizeof(char), "We assume that j-types are the same as C types");
 521 _Static_assert(sizeof(void*) <= 8, "Pointers must fit into 64 bits");
 522
 523 typedef jlongArray int64_tArray;
 524 typedef jbyteArray int8_tArray;
 525
 526 static inline jstring str_ref_to_java(JNIEnv *env, const char* chars, size_t len) {
 527         // Sadly we need to create a temporary because Java can't accept a char* without a 0-terminator
 528         char* conv_buf = MALLOC(len + 1, "str conv buf");
 529         memcpy(conv_buf, chars, len);
 530         conv_buf[len] = 0;
 531         jstring ret = (*env)->NewStringUTF(env, conv_buf);
 532         FREE(conv_buf);
 533         return ret;
 534 }
 535 static inline LDKStr java_to_owned_str(JNIEnv *env, jstring str) {
 536         uint64_t str_len = (*env)->GetStringUTFLength(env, str);
 537         char* newchars = MALLOC(str_len + 1, "String chars");
 538         const char* jchars = (*env)->GetStringUTFChars(env, str, NULL);
 539         memcpy(newchars, jchars, str_len);
 540         newchars[str_len] = 0;
 541         (*env)->ReleaseStringUTFChars(env, str, jchars);
 542         LDKStr res = {
 543                 .chars = newchars,
 544                 .len = str_len,
 545                 .chars_is_owned = true
 546         };
 547         return res;
 548 }
 549
 550 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1ldk_1c_1bindings_1version(JNIEnv *env, jclass _c) {
 551         return str_ref_to_java(env, check_get_ldk_bindings_version(), strlen(check_get_ldk_bindings_version()));
 552 }
 553 JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1ldk_1version(JNIEnv *env, jclass _c) {
 554         return str_ref_to_java(env, check_get_ldk_version(), strlen(check_get_ldk_version()));
 555 }
 556 #include "version.c"
 557 """
 558         self.c_version_file = """JNIEXPORT jstring JNICALL Java_org_ldk_impl_bindings_get_1lib_1version_1string(JNIEnv *env, jclass _c) {
 559         return str_ref_to_java(env, "<git_version_ldk_garbagecollected>", strlen("<git_version_ldk_garbagecollected>"));
 560 }"""
 561
 562         self.hu_struct_file_prefix = """package org.ldk.structs;
 563
 564 import org.ldk.impl.bindings;
 565 import org.ldk.enums.*;
 566 import org.ldk.util.*;
 567 import java.util.Arrays;
 568 import java.lang.ref.Reference;
 569 import javax.annotation.Nullable;
 570
 571 """
 572         self.c_fn_ty_pfx = "JNIEXPORT "
 573         self.c_fn_args_pfx = "JNIEnv *env, jclass clz"
 574         self.file_ext = ".java"
 575         self.ptr_c_ty = "int64_t"
 576         self.ptr_native_ty = "long"
 577         self.usize_c_ty = "int64_t"
 578         self.usize_native_ty = "long"
 579         self.native_zero_ptr = "0"
 580         self.result_c_ty = "jclass"
 581         self.ptr_arr = "jobjectArray"
 582         self.is_arr_some_check = ("", " != NULL")
 583         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 584
 585     def construct_jenv(self):
 586         res =  "JNIEnv *env;\n"
 587         res += "jint get_jenv_res = (*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_6);\n"
 588         res += "if (get_jenv_res == JNI_EDETACHED) {\n"
 589         if self.target == Target.ANDROID:
 590             res += "\tDO_ASSERT((*j_calls->vm)->AttachCurrentThread(j_calls->vm, &env, NULL) == JNI_OK);\n"
 591         else:
 592             res += "\tDO_ASSERT((*j_calls->vm)->AttachCurrentThread(j_calls->vm, (void**)&env, NULL) == JNI_OK);\n"
 593         res += "} else {\n"
 594         res += "\tDO_ASSERT(get_jenv_res == JNI_OK);\n"
 595         res += "}\n"
 596         return res
 597     def deconstruct_jenv(self):
 598         res = "if (get_jenv_res == JNI_EDETACHED) {\n"
 599         res += "\tDO_ASSERT((*j_calls->vm)->DetachCurrentThread(j_calls->vm) == JNI_OK);\n"
 600         res += "}\n"
 601         return res
 602
 603     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 604         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 605             return "(*env)->ReleasePrimitiveArrayCritical(env, " + arr_var + ", " + arr_ptr_var + ", 0)"
 606         return None
 607     def create_native_arr_call(self, arr_len, ty_info):
 608         if ty_info.c_ty == "int8_tArray":
 609             return "(*env)->NewByteArray(env, " + arr_len + ")"
 610         elif ty_info.subty.c_ty.endswith("Array"):
 611             clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 612             self.c_array_class_caches.add(clz_var)
 613             return "(*env)->NewObjectArray(env, " + arr_len + ", " + clz_var + "_clz, NULL);\n"
 614         else:
 615             return "(*env)->New" + ty_info.java_ty.strip("[]").title() + "Array(env, " + arr_len + ")"
 616     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 617         if ty_info.c_ty == "int8_tArray":
 618             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 619         else:
 620             assert False
 621     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 622         if ty_info.c_ty == "int8_tArray":
 623             if copy:
 624                 return "(*env)->GetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", " + dest_name + ")"
 625             else:
 626                 return "(*env)->GetByteArrayElements (env, " + arr_name + ", NULL)"
 627         elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 628             return "(*env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (env, " + arr_name + ", NULL)"
 629         else:
 630             return None
 631     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 632         if self.get_native_arr_contents(arr_name, "", "", ty_info, False) is None:
 633             return "(*env)->GetObjectArrayElement(env, " + arr_name + ", " + idxc + ")"
 634         else:
 635             assert False # Only called if above is None
 636     def get_native_arr_ptr_call(self, ty_info):
 637         if ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"):
 638             return None
 639         return ("(*env)->GetPrimitiveArrayCritical(env, ", ", NULL)")
 640     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 641         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 642             return None
 643         return "(*env)->SetObjectArrayElement(env, " + arr_name + ", " + idxc + ", " + entry_access + ")"
 644     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 645         if ty_info.c_ty == "int8_tArray":
 646             return "(*env)->ReleaseByteArrayElements(env, " + arr_name + ", (int8_t*)" + dest_name + ", 0);"
 647         else:
 648             return "(*env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements(env, " + arr_name + ", " + dest_name + ", 0)"
 649
 650     def map_hu_array_elems(self, arr_name, conv_name, arr_ty, elem_ty):
 651         if elem_ty.java_ty == "long" and elem_ty.java_hu_ty != "long":
 652             return arr_name + " != null ? Arrays.stream(" + arr_name + ").mapToLong(" + conv_name + " -> " + elem_ty.from_hu_conv[0] + ").toArray() : null"
 653         elif elem_ty.java_ty == "long":
 654             return arr_name + " != null ? Arrays.stream(" + arr_name + ").map(" + conv_name + " -> " + elem_ty.from_hu_conv[0] + ").toArray() : null"
 655         elif elem_ty.java_hu_ty == "UInt5":
 656             return arr_name + " != null ? InternalUtils.convUInt5Array(" + arr_name + ") : null"
 657         elif elem_ty.java_hu_ty == "WitnessVersion":
 658             return arr_name + " != null ? InternalUtils.convWitnessVersionArray(" + arr_name + ") : null"
 659         else:
 660             return arr_name + " != null ? Arrays.stream(" + arr_name + ").map(" + conv_name + " -> " + elem_ty.from_hu_conv[0] + ").toArray(" + arr_ty.java_ty + "::new) : null"
 661
 662     def str_ref_to_native_call(self, var_name, str_len):
 663         return "str_ref_to_java(env, " + var_name + ", " + str_len + ")"
 664     def str_ref_to_c_call(self, var_name):
 665         return "java_to_owned_str(env, " + var_name + ")"
 666     def str_to_hu_conv(self, var_name):
 667         return None
 668     def str_from_hu_conv(self, var_name):
 669         return None
 670
 671     def c_fn_name_define_pfx(self, fn_name, has_args):
 672         if has_args:
 673             return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz, "
 674         return "JNICALL Java_org_ldk_impl_bindings_" + fn_name.replace("_", "_1") + "(JNIEnv *env, jclass clz"
 675
 676     def init_str(self):
 677         res = ""
 678         for ty in sorted(self.c_array_class_caches):
 679             res = res + "static jclass " + ty + "_clz = NULL;\n"
 680         res = res + "JNIEXPORT void Java_org_ldk_impl_bindings_init_1class_1cache(JNIEnv * env, jclass clz) {\n"
 681         for ty in sorted(self.c_array_class_caches):
 682             res = res + "\t" + ty + "_clz = (*env)->FindClass(env, \"" + ty.replace("arr_of_", "[") + "\");\n"
 683             res = res + "\tCHECK(" + ty + "_clz != NULL);\n"
 684             res = res + "\t" + ty + "_clz = (*env)->NewGlobalRef(env, " + ty + "_clz);\n"
 685         res = res + "}\n"
 686         return res
 687
 688     def var_decl_statement(self, ty_string, var_name, statement):
 689         return ty_string + " " + var_name + " = " + statement
 690
 691     def get_java_arr_len(self, arr_name):
 692         return arr_name + ".length"
 693     def get_java_arr_elem(self, elem_ty, arr_name, idx):
 694         return arr_name + "[" + idx + "]"
 695     def constr_hu_array(self, ty_info, arr_len):
 696         base_ty = ty_info.subty.java_hu_ty.split("[")[0].split("<")[0]
 697         conv = "new " + base_ty + "[" + arr_len + "]"
 698         if "[" in ty_info.subty.java_hu_ty.split("<")[0]:
 699             # Do a bit of a dance to move any excess [] to the end
 700             conv += "[" + ty_info.subty.java_hu_ty.split("<")[0].split("[")[1]
 701         return conv
 702     def cleanup_converted_native_array(self, ty_info, arr_name):
 703         return None
 704
 705     def primitive_arr_from_hu(self, arr_ty, fixed_len, arr_name):
 706         mapped_ty = arr_ty.subty
 707         if fixed_len is not None:
 708             return ("InternalUtils.check_arr_len(" + arr_name + ", " + fixed_len + ")", "")
 709         return None
 710     def primitive_arr_to_hu(self, arr_ty, fixed_len, arr_name, conv_name):
 711         return None
 712
 713     def java_arr_ty_str(self, elem_ty_str):
 714         return elem_ty_str + "[]"
 715
 716     def for_n_in_range(self, n, minimum, maximum):
 717         return "for (int " + n + " = " + minimum + "; " + n + " < " + maximum + "; " + n + "++) {"
 718     def for_n_in_arr(self, n, arr_name, arr_elem_ty):
 719         return ("for (" + arr_elem_ty.java_hu_ty + " " + n + ": " + arr_name + ") { ", " }")
 720
 721     def get_ptr(self, var):
 722         return var + ".ptr"
 723     def set_null_skip_free(self, var):
 724         return var + ".ptr" + " = 0;"
 725
 726     def add_ref(self, holder, referent):
 727         return "if (" + holder + " != null) { " + holder + ".ptrs_to.add(" + referent + "); }"
 728
 729     def fully_qualified_hu_ty_path(self, ty):
 730         if ty.java_fn_ty_arg.startswith("L") and ty.java_fn_ty_arg.endswith(";"):
 731             return ty.java_fn_ty_arg.strip("L;").replace("/", ".")
 732         if ty.java_hu_ty == "UnqualifiedError" or ty.java_hu_ty == "UInt5" or ty.java_hu_ty == "WitnessVersion":
 733             return "org.ldk.util." + ty.java_hu_ty
 734         if not ty.is_native_primitive and ty.rust_obj is not None and not "[]" in ty.java_hu_ty:
 735             return "org.ldk.structs." + ty.java_hu_ty
 736         return ty.java_hu_ty
 737
 738     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 739         out_java_enum = "package org.ldk.enums;\n\n"
 740         out_java = ""
 741         out_c = ""
 742         out_c += "static inline LDK" + struct_name + " LDK" + struct_name + "_from_java(" + self.c_fn_args_pfx + ") {\n"
 743         out_c += "\tjint ord = (*env)->CallIntMethod(env, clz, ordinal_meth);\n"
 744         out_c += "\tif (UNLIKELY((*env)->ExceptionCheck(env))) {\n"
 745         out_c += "\t\t(*env)->ExceptionDescribe(env);\n"
 746         out_c += "\t\t(*env)->FatalError(env, \"A call to " + struct_name + ".ordinal() from rust threw an exception.\");\n"
 747         out_c += "\t}\n"
 748         out_c += "\tswitch (ord) {\n"
 749
 750         if enum_doc_comment is not None:
 751             out_java_enum += "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
 752         out_java_enum += "public enum " + struct_name + " {\n"
 753         ord_v = 0
 754         for var, var_docs in variants:
 755             if var_docs is not None:
 756                 out_java_enum += "\t/**\n\t * " + var_docs.replace("\n", "\n\t * ") + "\n\t */\n"
 757             out_java_enum += "\t" + var + ",\n"
 758             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 759             ord_v = ord_v + 1
 760         out_java_enum = out_java_enum + "\t; static native void init();\n"
 761         out_java_enum = out_java_enum + "\tstatic { init(); }\n"
 762         out_java_enum = out_java_enum + "}"
 763         out_java = out_java + "\tstatic { " + struct_name + ".values(); /* Force enum statics to run */ }\n"
 764         out_c += "\t}\n"
 765         out_c += "\t(*env)->FatalError(env, \"A call to " + struct_name + ".ordinal() from rust returned an invalid value.\");\n"
 766         out_c += "\tabort(); // Unreachable, but will let the compiler know we don't return here\n"
 767         out_c += "}\n"
 768
 769         out_c = out_c + "static jclass " + struct_name + "_class = NULL;\n"
 770         for var, _ in variants:
 771             out_c = out_c + "static jfieldID " + struct_name + "_" + var + " = NULL;\n"
 772         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"
 773         out_c = out_c + "\t" + struct_name + "_class = (*env)->NewGlobalRef(env, clz);\n"
 774         out_c = out_c + "\tCHECK(" + struct_name + "_class != NULL);\n"
 775         for var, _ in variants:
 776             out_c = out_c + "\t" + struct_name + "_" + var + " = (*env)->GetStaticFieldID(env, " + struct_name + "_class, \"" + var + "\", \"Lorg/ldk/enums/" + struct_name + ";\");\n"
 777             out_c = out_c + "\tCHECK(" + struct_name + "_" + var + " != NULL);\n"
 778         out_c = out_c + "}\n"
 779         out_c = out_c + "static inline jclass LDK" + struct_name + "_to_java(JNIEnv *env, LDK" + struct_name + " val) {\n"
 780         out_c = out_c + "\tswitch (val) {\n"
 781         ord_v = 0
 782         for var, _ in variants:
 783             out_c = out_c + "\t\tcase " + var + ":\n"
 784             out_c = out_c + "\t\t\treturn (*env)->GetStaticObjectField(env, " + struct_name + "_class, " + struct_name + "_" + var + ");\n"
 785             ord_v = ord_v + 1
 786         out_c = out_c + "\t\tdefault: abort();\n"
 787         out_c = out_c + "\t}\n"
 788         out_c = out_c + "}\n\n"
 789
 790         return (out_c, out_java_enum, out_java)
 791
 792     def c_unitary_enum_to_native_call(self, ty_info):
 793         return (ty_info.rust_obj + "_to_java(env, ", ")")
 794     def native_unitary_enum_to_c_call(self, ty_info):
 795         return (ty_info.rust_obj + "_from_java(env, ", ")")
 796
 797     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 798         out_c = ""
 799         for var in variants:
 800             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 801             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 802         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"
 803         for var_name in variants:
 804             out_c += "\t" + struct_name + "_" + var_name + "_class =\n"
 805             out_c += "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"org/ldk/impl/bindings$" + struct_name + "$" + var_name + "\"));\n"
 806             out_c += "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 807             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"
 808             out_c += "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 809         out_c = out_c + "}\n"
 810         return out_c
 811
 812     def c_complex_enum_pass_ty(self, struct_name):
 813         return "jobject"
 814
 815     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 816         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 817         for param in c_params:
 818             ret = ret + ", " + param
 819         return ret + ")"
 820
 821     def native_c_map_trait(self, struct_name, field_vars, flattened_field_vars, field_fns, trait_doc_comment):
 822         out_java_trait = ""
 823         out_java = ""
 824
 825         # First generate most of the Java code, note that we need information about java method argument strings for C
 826         out_java_trait = out_java_trait + self.hu_struct_file_prefix
 827         if trait_doc_comment is not None:
 828             out_java_trait += "/**\n * " + trait_doc_comment.replace("\n", "\n * ") + "\n */\n"
 829         out_java_trait += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
 830         out_java_trait = out_java_trait + "public class " + struct_name.replace("LDK","") + " extends CommonBase {\n"
 831         out_java_trait = out_java_trait + "\tfinal bindings." + struct_name + " bindings_instance;\n"
 832         out_java_trait = out_java_trait + "\t" + struct_name.replace("LDK", "") + "(Object _dummy, long ptr) { super(ptr); bindings_instance = null; }\n"
 833         out_java_trait = out_java_trait + "\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg"
 834         for var in flattened_field_vars:
 835             if isinstance(var, ConvInfo):
 836                 out_java_trait = out_java_trait + ", " + var.java_hu_ty + " " + var.arg_name
 837             else:
 838                 out_java_trait = out_java_trait + ", bindings." + var[0] + " " + var[1]
 839         out_java_trait = out_java_trait + ") {\n"
 840         out_java_trait = out_java_trait + "\t\tsuper(bindings." + struct_name + "_new(arg"
 841         for var in flattened_field_vars:
 842             if isinstance(var, ConvInfo):
 843                 if var.from_hu_conv is not None:
 844                     out_java_trait = out_java_trait + ", " + var.from_hu_conv[0]
 845                 else:
 846                     out_java_trait = out_java_trait + ", " + var.arg_name
 847             else:
 848                 out_java_trait = out_java_trait + ", " + var[1]
 849         out_java_trait = out_java_trait + "));\n"
 850         out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(arg);\n"
 851         for var in flattened_field_vars:
 852             if isinstance(var, ConvInfo):
 853                 if var.from_hu_conv is not None and var.from_hu_conv[1] != "":
 854                     out_java_trait = out_java_trait + "\t\t" + var.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n"
 855             else:
 856                 out_java_trait = out_java_trait + "\t\tthis.ptrs_to.add(" + var[1] + ");\n"
 857         out_java_trait = out_java_trait + "\t\tthis.bindings_instance = arg;\n"
 858         out_java_trait = out_java_trait + "\t}\n"
 859         out_java_trait = out_java_trait + "\t@Override @SuppressWarnings(\"deprecation\")\n"
 860         out_java_trait = out_java_trait + "\tprotected void finalize() throws Throwable {\n"
 861         out_java_trait = out_java_trait + "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n"
 862         out_java_trait = out_java_trait + "\t}\n\n"
 863
 864         java_trait_constr = "\tprivate static class " + struct_name + "Holder { " + struct_name.replace("LDK", "") + " held; }\n"
 865         java_trait_constr = java_trait_constr + "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 866         for var in flattened_field_vars:
 867             if isinstance(var, ConvInfo):
 868                 java_trait_constr = java_trait_constr + ", " + var.java_hu_ty + " " + var.arg_name
 869             else:
 870                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 871                 # Java-implemented version, so we require users pass a Java implementation here :/
 872                 java_trait_constr = java_trait_constr + ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 873         java_trait_constr = java_trait_constr + ") {\n\t\tfinal " + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 874         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new bindings." + struct_name + "() {\n"
 875         out_java_trait = out_java_trait + "\tpublic static interface " + struct_name.replace("LDK", "") + "Interface {\n"
 876         out_java = out_java + "\tpublic interface " + struct_name + " {\n"
 877         java_meths = []
 878         for fn_line in field_fns:
 879             java_meth_descr = "("
 880             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 881                 out_java = out_java + "\t\t " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 882                 java_trait_constr = java_trait_constr + "\t\t\t@Override public " + fn_line.ret_ty_info.java_ty + " " + fn_line.fn_name + "("
 883                 out_java_trait += "\t\t/**\n\t\t * " + fn_line.docs.replace("\n", "\n\t\t * ") + "\n\t\t */\n"
 884                 out_java_trait = out_java_trait + "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_line.fn_name + "("
 885
 886                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 887                     if idx >= 1:
 888                         out_java = out_java + ", "
 889                         java_trait_constr = java_trait_constr + ", "
 890                         out_java_trait = out_java_trait + ", "
 891                     out_java = out_java + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 892                     out_java_trait = out_java_trait + arg_conv_info.java_hu_ty + " " + arg_conv_info.arg_name
 893                     java_trait_constr = java_trait_constr + arg_conv_info.java_ty + " " + arg_conv_info.arg_name
 894                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 895                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 896                 java_meths.append((fn_line.fn_name, java_meth_descr))
 897
 898                 out_java = out_java + ");\n"
 899                 out_java_trait = out_java_trait + ");\n"
 900                 java_trait_constr = java_trait_constr + ") {\n"
 901
 902                 for arg_info in fn_line.args_ty:
 903                     if arg_info.to_hu_conv is not None:
 904                         java_trait_constr = java_trait_constr + "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 905
 906                 if fn_line.ret_ty_info.java_ty != "void":
 907                     java_trait_constr = java_trait_constr + "\t\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_line.fn_name + "("
 908                 else:
 909                     java_trait_constr = java_trait_constr + "\t\t\t\targ." + fn_line.fn_name + "("
 910
 911                 for idx, arg_info in enumerate(fn_line.args_ty):
 912                     if idx != 0:
 913                         java_trait_constr = java_trait_constr + ", "
 914                     if arg_info.to_hu_conv_name is not None:
 915                         java_trait_constr = java_trait_constr + arg_info.to_hu_conv_name
 916                     else:
 917                         java_trait_constr = java_trait_constr + arg_info.arg_name
 918
 919                 java_trait_constr += ");\n"
 920                 java_trait_constr += "\t\t\t\tReference.reachabilityFence(arg);\n"
 921                 if fn_line.ret_ty_info.java_ty != "void":
 922                     if fn_line.ret_ty_info.from_hu_conv is not None:
 923                         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"
 924                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 925                             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"
 926                         #if fn_line.ret_ty_info.rust_obj in result_types:
 927                         java_trait_constr = java_trait_constr + "\t\t\t\treturn result;\n"
 928                     else:
 929                         java_trait_constr = java_trait_constr + "\t\t\t\treturn ret;\n"
 930                 java_trait_constr = java_trait_constr + "\t\t\t}\n"
 931         java_trait_constr = java_trait_constr + "\t\t}"
 932         for var in field_vars:
 933             if isinstance(var, ConvInfo):
 934                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 935             else:
 936                 java_trait_constr += ", " + var[1] + ".new_impl(" + var[1] + "_impl"
 937                 for suparg in var[2]:
 938                     if isinstance(suparg, ConvInfo):
 939                         java_trait_constr += ", " + suparg.arg_name
 940                     else:
 941                         java_trait_constr += ", " + suparg[1]
 942                 java_trait_constr += ").bindings_instance"
 943                 for suparg in var[2]:
 944                     if isinstance(suparg, ConvInfo):
 945                         java_trait_constr += ", " + suparg.arg_name
 946                     else:
 947                         java_trait_constr += ", " + suparg[1]
 948         out_java_trait = out_java_trait + "\t}\n"
 949         out_java_trait = out_java_trait + java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 950
 951         out_java = out_java + "\t}\n"
 952
 953         out_java = out_java + "\tpublic static native long " + struct_name + "_new(" + struct_name + " impl"
 954         for var in flattened_field_vars:
 955             if isinstance(var, ConvInfo):
 956                 out_java = out_java + ", " + var.java_ty + " " + var.arg_name
 957             else:
 958                 out_java = out_java + ", " + var[0] + " " + var[1]
 959         out_java = out_java + ");\n"
 960
 961         # Now that we've written out our java code (and created java_meths), generate C
 962         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 963         out_c = out_c + "\tatomic_size_t refcnt;\n"
 964         out_c = out_c + "\tJavaVM *vm;\n"
 965         out_c = out_c + "\tjweak o;\n"
 966         for var in flattened_field_vars:
 967             if isinstance(var, ConvInfo):
 968                 # We're a regular ol' field
 969                 pass
 970             else:
 971                 # We're a supertrait
 972                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 973         for fn in field_fns:
 974             if fn.fn_name != "free" and fn.fn_name != "cloned":
 975                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 976         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 977
 978         for fn_line in field_fns:
 979             if fn_line.fn_name == "free":
 980                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 981                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 982                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 983                 out_c += "\t\t" + self.construct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 984                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 985                 out_c += "\t\t" + self.deconstruct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 986                 out_c = out_c + "\t\tFREE(j_calls);\n"
 987                 out_c = out_c + "\t}\n}\n"
 988
 989         for idx, fn_line in enumerate(field_fns):
 990             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 991                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 992                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 993                 if fn_line.self_is_const:
 994                     out_c = out_c + "const void* this_arg"
 995                 else:
 996                     out_c = out_c + "void* this_arg"
 997
 998                 for idx, arg in enumerate(fn_line.args_ty):
 999                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
1000
1001                 out_c = out_c + ") {\n"
1002                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
1003                 out_c += "\t" + self.construct_jenv().replace("\n", "\n\t").strip() + "\n"
1004
1005                 for arg_info in fn_line.args_ty:
1006                     if arg_info.ret_conv is not None:
1007                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
1008                         out_c = out_c + arg_info.arg_name
1009                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
1010
1011                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
1012                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
1013                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
1014                 elif fn_line.ret_ty_info.c_ty == "void":
1015                     out_c += "\t(*env)->CallVoidMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
1016                 elif fn_line.ret_ty_info.java_hu_ty == "String" or "org/ldk/enums" in fn_line.ret_ty_info.java_fn_ty_arg:
1017                     # Manually write out String methods as they're just an Object
1018                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
1019                 elif not fn_line.ret_ty_info.passed_as_ptr:
1020                     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"
1021                 else:
1022                     out_c = out_c + "\tuint64_t ret = (*env)->CallLongMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
1023
1024                 for idx, arg_info in enumerate(fn_line.args_ty):
1025                     if arg_info.ret_conv is not None:
1026                         out_c = out_c + ", " + arg_info.ret_conv_name
1027                     else:
1028                         out_c = out_c + ", " + arg_info.arg_name
1029                 out_c = out_c + ");\n"
1030
1031                 out_c += "\tif (UNLIKELY((*env)->ExceptionCheck(env))) {\n"
1032                 out_c += "\t\t(*env)->ExceptionDescribe(env);\n"
1033                 out_c += "\t\t(*env)->FatalError(env, \"A call to " + fn_line.fn_name + " in " + struct_name + " from rust threw an exception.\");\n"
1034                 out_c += "\t}\n"
1035
1036                 if fn_line.ret_ty_info.arg_conv is not None:
1037                     out_c += "\t" + fn_line.ret_ty_info.arg_conv.replace("\n", "\n\t") + "\n"
1038                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
1039                     out_c += "\treturn " + fn_line.ret_ty_info.arg_conv_name + ";\n"
1040                 else:
1041                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
1042                     if not fn_line.ret_ty_info.passed_as_ptr and fn_line.ret_ty_info.c_ty != "void":
1043                         out_c += "\treturn ret;\n"
1044
1045                 out_c = out_c + "}\n"
1046
1047         # If we can, write out a clone function whether we need one or not, as we use them in moving to rust
1048         can_clone_with_ptr = True
1049         for var in field_vars:
1050             if isinstance(var, ConvInfo):
1051                 can_clone_with_ptr = False
1052         if can_clone_with_ptr:
1053             out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
1054             out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
1055             out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
1056             for var in field_vars:
1057                 if not isinstance(var, ConvInfo):
1058                     out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
1059             out_c = out_c + "}\n"
1060
1061         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
1062         for var in flattened_field_vars:
1063             if isinstance(var, ConvInfo):
1064                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
1065             else:
1066                 out_c = out_c + ", jobject " + var[1]
1067         out_c = out_c + ") {\n"
1068
1069         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
1070         out_c = out_c + "\tCHECK(c != NULL);\n"
1071         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
1072         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
1073         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
1074         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
1075
1076         for (fn_name, java_meth_descr) in java_meths:
1077             if fn_name != "free" and fn_name != "cloned":
1078                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
1079                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
1080
1081         for var in flattened_field_vars:
1082             if isinstance(var, ConvInfo) and var.arg_conv is not None:
1083                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
1084         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
1085         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
1086         for fn_line in field_fns:
1087             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
1088                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
1089             elif fn_line.fn_name == "free":
1090                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
1091             else:
1092                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
1093         for var in field_vars:
1094             if isinstance(var, ConvInfo):
1095                 if var.arg_conv_name is not None:
1096                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
1097                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
1098                 else:
1099                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
1100                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
1101             else:
1102                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1]
1103                 for suparg in var[2]:
1104                     if isinstance(suparg, ConvInfo):
1105                         out_c = out_c + ", " + suparg.arg_name
1106                     else:
1107                         out_c = out_c + ", " + suparg[1]
1108                 out_c += "),\n"
1109         out_c = out_c + "\t};\n"
1110         for var in flattened_field_vars:
1111             if not isinstance(var, ConvInfo):
1112                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
1113         out_c = out_c + "\treturn ret;\n"
1114         out_c = out_c + "}\n"
1115
1116         out_c = out_c + self.c_fn_ty_pfx + "int64_t " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "jobject o"
1117         for var in flattened_field_vars:
1118             if isinstance(var, ConvInfo):
1119                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
1120             else:
1121                 out_c = out_c + ", jobject " + var[1]
1122         out_c = out_c + ") {\n"
1123         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
1124         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
1125         for var in flattened_field_vars:
1126             if isinstance(var, ConvInfo):
1127                 out_c = out_c + ", " + var.arg_name
1128             else:
1129                 out_c = out_c + ", " + var[1]
1130         out_c = out_c + ");\n"
1131         out_c = out_c + "\treturn tag_ptr(res_ptr, true);\n"
1132         out_c = out_c + "}\n"
1133
1134         for var in flattened_field_vars:
1135             if not isinstance(var, ConvInfo):
1136                 out_java_trait += "\n\t/**\n"
1137                 out_java_trait += "\t * Gets the underlying " + var[1] + ".\n"
1138                 out_java_trait += "\t */\n"
1139                 underscore_name = ''.join('_' + c.lower() if c.isupper() else c for c in var[1]).strip('_')
1140                 out_java_trait += "\tpublic " + var[1] + " get_" + underscore_name + "() {\n"
1141                 out_java_trait += "\t\t" + var[1] + " res = new " + var[1] + "(null, bindings." + struct_name + "_get_" + var[1] + "(this.ptr));\n"
1142                 out_java_trait += "\t\tthis.ptrs_to.add(res);\n"
1143                 out_java_trait += "\t\treturn res;\n"
1144                 out_java_trait += "\t}\n"
1145                 out_java_trait += "\n"
1146
1147                 out_java += "\tpublic static native long " + struct_name + "_get_" + var[1] + "(long arg);\n"
1148
1149                 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"
1150                 out_c += "\t" + struct_name + " *inp = (" + struct_name + " *)untag_ptr(arg);\n"
1151                 out_c += "\treturn tag_ptr(&inp->" + var[1] + ", false);\n"
1152                 out_c += "}\n"
1153
1154         return (out_java, out_java_trait, out_c)
1155
1156     def trait_struct_inc_refcnt(self, ty_info):
1157         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
1158         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
1159         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_cloned(&" + ty_info.var_name + "_conv);\n}"
1160         return base_conv
1161
1162     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
1163         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
1164         out_java_enum = ""
1165         out_java = ""
1166         out_c = ""
1167
1168         out_java_enum += (self.hu_struct_file_prefix)
1169         out_java_enum += "\n/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
1170         out_java_enum += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
1171         out_java_enum += ("public class " + java_hu_type + " extends CommonBase {\n")
1172         out_java_enum += ("\tprivate " + java_hu_type + "(Object _dummy, long ptr) { super(ptr); }\n")
1173         out_java_enum += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
1174         out_java_enum += ("\tprotected void finalize() throws Throwable {\n")
1175         out_java_enum += ("\t\tsuper.finalize();\n")
1176         out_java_enum += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK", "") + "_free(ptr); }\n")
1177         out_java_enum += ("\t}\n")
1178         out_java_enum += ("\tstatic " + java_hu_type + " constr_from_ptr(long ptr) {\n")
1179         out_java_enum += ("\t\tbindings." + struct_name + " raw_val = bindings." + struct_name + "_ref_from_ptr(ptr);\n")
1180         java_hu_subclasses = ""
1181
1182         init_meth_jty_strs = {}
1183
1184         out_java +=  ("\tpublic static class " + struct_name + " {\n")
1185         out_java +=  ("\t\tprivate " + struct_name + "() {}\n")
1186         for var in variant_list:
1187             out_java +=  ("\t\tpublic final static class " + var.var_name + " extends " + struct_name + " {\n")
1188             if var.var_docs is not None:
1189                 java_hu_subclasses += "\t/**\n\t * " + var.var_docs.replace("\n", "\n\t * ") + "\n\t */\n"
1190             java_hu_subclasses += "\tpublic final static class " + var.var_name + " extends " + java_hu_type + " {\n"
1191             out_java_enum += ("\t\tif (raw_val.getClass() == bindings." + struct_name + "." + var.var_name + ".class) {\n")
1192             out_java_enum += ("\t\t\treturn new " + var.var_name + "(ptr, (bindings." + struct_name + "." + var.var_name + ")raw_val);\n")
1193             init_meth_jty_str = ""
1194             init_meth_params = ""
1195             init_meth_body = ""
1196             hu_conv_body = ""
1197             for idx, (field_ty, field_docs) in enumerate(var.fields):
1198                 if idx > 0:
1199                     init_meth_params = init_meth_params + ", "
1200
1201                 java_ty = field_ty.java_ty
1202                 if field_ty.java_fn_ty_arg.startswith("L") and field_ty.java_fn_ty_arg.endswith(";"):
1203                     # If this is a simple enum, we have to reference it in the low-level bindings differently:
1204                     java_ty = field_ty.java_fn_ty_arg.strip("L;").replace("/", ".")
1205                 out_java += "\t\t\tpublic " + java_ty + " " + field_ty.arg_name + ";\n"
1206                 if field_docs is not None:
1207                     java_hu_subclasses += "\t\t/**\n\t\t * " + field_docs.replace("\n", "\n\t\t * ") + "\n\t\t*/\n"
1208                 java_hu_subclasses += "\t\t"
1209                 if field_ty.nullable:
1210                     java_hu_subclasses += "@Nullable "
1211                 java_hu_subclasses += "public final " + self.fully_qualified_hu_ty_path(field_ty) + " " + field_ty.arg_name + ";\n"
1212                 init_meth_params = init_meth_params + java_ty + " " + field_ty.arg_name
1213
1214                 init_meth_body = init_meth_body + "this." + field_ty.arg_name + " = " + field_ty.arg_name + "; "
1215                 if field_ty.to_hu_conv is not None:
1216                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.java_ty + " " + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1217                     hu_conv_body = hu_conv_body + "\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1218                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1219                 else:
1220                     hu_conv_body = hu_conv_body + "\t\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
1221                 init_meth_jty_str = init_meth_jty_str + field_ty.java_fn_ty_arg
1222             out_java +=  ("\t\t\t" + var.var_name + "(" + init_meth_params + ") { ")
1223             out_java +=  (init_meth_body)
1224             out_java +=  ("}\n")
1225             out_java += ("\t\t}\n")
1226             out_java_enum += ("\t\t}\n")
1227             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"
1228             java_hu_subclasses = java_hu_subclasses + hu_conv_body
1229             java_hu_subclasses = java_hu_subclasses + "\t\t}\n\t}\n"
1230             init_meth_jty_strs[var.var_name] = init_meth_jty_str
1231         out_java += ("\t\tstatic native void init();\n")
1232         out_java += ("\t}\n")
1233         out_java_enum += ("\t\tassert false; return null; // Unreachable without extending the (internal) bindings interface\n\t}\n\n")
1234         out_java_enum += (java_hu_subclasses)
1235         out_java += ("\tstatic { " + struct_name + ".init(); }\n")
1236         out_java += ("\tpublic static native " + struct_name + " " + struct_name + "_ref_from_ptr(long ptr);\n");
1237
1238         out_c += (self.c_complex_enum_pfx(struct_name, [x.var_name for x in variant_list], init_meth_jty_strs))
1239
1240         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")
1241         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)untag_ptr(ptr);\n")
1242         out_c += ("\tswitch(obj->tag) {\n")
1243         for var in variant_list:
1244             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
1245             c_params = []
1246             for idx, (field_map, field_docs) in enumerate(var.fields):
1247                 if field_map.ret_conv is not None:
1248                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1249                     if var.tuple_variant:
1250                         out_c += "obj->" + camel_to_snake(var.var_name)
1251                     else:
1252                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
1253                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1254                     c_params.append(field_map.ret_conv_name)
1255                 else:
1256                     if var.tuple_variant:
1257                         c_params.append("obj->" + camel_to_snake(var.var_name))
1258                     else:
1259                         c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
1260             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
1261             out_c += ("\t\t}\n")
1262         out_c += ("\t\tdefault: abort();\n")
1263         out_c += ("\t}\n}\n")
1264         return (out_java, out_java_enum, out_c)
1265
1266     def map_opaque_struct(self, struct_name, struct_doc_comment):
1267         out_opaque_struct_human = ""
1268         out_opaque_struct_human += self.hu_struct_file_prefix
1269         out_opaque_struct_human += "\n/**\n * " + struct_doc_comment.replace("\n", "\n * ") + "\n */\n"
1270         out_opaque_struct_human += "@SuppressWarnings(\"unchecked\") // We correctly assign various generic arrays\n"
1271         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
1272         out_opaque_struct_human += ("public class " + hu_name + " extends CommonBase")
1273         if struct_name.startswith("LDKLocked") or struct_name.startswith("LDKReadOnly"):
1274             out_opaque_struct_human += (" implements AutoCloseable")
1275         out_opaque_struct_human += (" {\n")
1276         out_opaque_struct_human += ("\t" + hu_name + "(Object _dummy, long ptr) { super(ptr); }\n")
1277         if struct_name.startswith("LDKLocked") or struct_name.startswith("LDKReadOnly"):
1278             out_opaque_struct_human += ("\t@Override public void close() {\n")
1279         else:
1280             out_opaque_struct_human += ("\t@Override @SuppressWarnings(\"deprecation\")\n")
1281             out_opaque_struct_human += ("\tprotected void finalize() throws Throwable {\n")
1282             out_opaque_struct_human += ("\t\tsuper.finalize();\n")
1283         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
1284         out_opaque_struct_human += ("\t}\n\n")
1285         return out_opaque_struct_human
1286
1287     def map_tuple(self, struct_name):
1288         return self.map_opaque_struct(struct_name, "A Tuple")
1289
1290     def map_result(self, struct_name, res_map, err_map):
1291         human_ty = struct_name.replace("LDKCResult", "Result")
1292         java_hu_struct = ""
1293         java_hu_struct += self.hu_struct_file_prefix
1294         java_hu_struct += "public class " + human_ty + " extends CommonBase {\n"
1295         java_hu_struct += "\tprivate " + human_ty + "(Object _dummy, long ptr) { super(ptr); }\n"
1296         java_hu_struct += "\tprotected void finalize() throws Throwable {\n"
1297         java_hu_struct += "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); } super.finalize();\n"
1298         java_hu_struct += "\t}\n\n"
1299         java_hu_struct += "\tstatic " + human_ty + " constr_from_ptr(long ptr) {\n"
1300         java_hu_struct += "\t\tif (bindings." + struct_name.replace("LDK", "") + "_is_ok(ptr)) {\n"
1301         java_hu_struct += "\t\t\treturn new " + human_ty + "_OK(null, ptr);\n"
1302         java_hu_struct += "\t\t} else {\n"
1303         java_hu_struct += "\t\t\treturn new " + human_ty + "_Err(null, ptr);\n"
1304         java_hu_struct += "\t\t}\n"
1305         java_hu_struct += "\t}\n"
1306
1307         java_hu_struct += "\tpublic static final class " + human_ty + "_OK extends " + human_ty + " {\n"
1308
1309         if res_map.java_hu_ty != "void":
1310             java_hu_struct += "\t\tpublic final " + res_map.java_hu_ty + " res;\n"
1311         java_hu_struct += "\t\tprivate " + human_ty + "_OK(Object _dummy, long ptr) {\n"
1312         java_hu_struct += "\t\t\tsuper(_dummy, ptr);\n"
1313         if res_map.java_hu_ty == "void":
1314             pass
1315         elif res_map.to_hu_conv is not None:
1316             java_hu_struct += "\t\t\t" + res_map.java_ty + " res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1317             java_hu_struct += "\t\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t\t")
1318             java_hu_struct += "\n\t\t\tthis.res = " + res_map.to_hu_conv_name + ";\n"
1319         else:
1320             java_hu_struct += "\t\t\tthis.res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1321         java_hu_struct += "\t\t}\n"
1322         java_hu_struct += "\t}\n\n"
1323
1324         java_hu_struct += "\tpublic static final class " + human_ty + "_Err extends " + human_ty + " {\n"
1325         if err_map.java_hu_ty != "void":
1326             java_hu_struct += "\t\tpublic final " + err_map.java_hu_ty + " err;\n"
1327         java_hu_struct += "\t\tprivate " + human_ty + "_Err(Object _dummy, long ptr) {\n"
1328         java_hu_struct += "\t\t\tsuper(_dummy, ptr);\n"
1329         if err_map.java_hu_ty == "void":
1330             pass
1331         elif err_map.to_hu_conv is not None:
1332             java_hu_struct += "\t\t\t" + err_map.java_ty + " err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1333             java_hu_struct += "\t\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t\t")
1334             java_hu_struct += "\n\t\t\tthis.err = " + err_map.to_hu_conv_name + ";\n"
1335         else:
1336             java_hu_struct += "\t\t\tthis.err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1337         java_hu_struct += "\t\t}\n"
1338
1339         java_hu_struct += "\t}\n\n"
1340         return java_hu_struct
1341
1342     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):
1343         out_java = ""
1344         out_c = ""
1345         out_java_struct = None
1346
1347         out_java += ("\tpublic static native ")
1348         out_c += (self.c_fn_ty_pfx)
1349         out_c += (return_type_info.c_ty)
1350         out_java += (return_type_info.java_ty)
1351         if return_type_info.ret_conv is not None:
1352             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1353         out_java += (" " + method_name + "(")
1354         have_args = len(argument_types) > 1 or (len(argument_types) > 0 and argument_types[0].c_ty != "void")
1355         out_c += (" " + self.c_fn_name_define_pfx(method_name, have_args))
1356
1357         for idx, arg_conv_info in enumerate(argument_types):
1358             if idx != 0:
1359                 out_java += (", ")
1360                 out_c += (", ")
1361             if arg_conv_info.c_ty != "void":
1362                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1363                 out_java += (arg_conv_info.java_ty + " " + arg_conv_info.arg_name)
1364
1365         out_java_struct = ""
1366         extra_java_struct_out = ""
1367         if not args_known:
1368             out_java_struct += ("\t// Skipped " + method_name + "\n")
1369         else:
1370             if doc_comment is not None:
1371                 out_java_struct += "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
1372             if return_type_info.nullable:
1373                 out_java_struct += "\t@Nullable\n"
1374             if not takes_self:
1375                 if meth_n == "new":
1376                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " of("
1377                 elif meth_n == "default":
1378                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " with_default("
1379                 else:
1380                     out_java_struct += "\tpublic static " + return_type_info.java_hu_ty + " " + meth_n + "("
1381             elif meth_n == "clone_ptr" or (struct_meth.startswith("LDKCResult") and (meth_n == "get_ok" or meth_n == "get_err")):
1382                 out_java_struct += ("\t" + return_type_info.java_hu_ty + " " + meth_n + "(")
1383             else:
1384                 if meth_n == "hash" and return_type_info.java_hu_ty == "long":
1385                     extra_java_struct_out = "\t@Override public int hashCode() {\n"
1386                     extra_java_struct_out += "\t\treturn (int)this.hash();\n"
1387                     extra_java_struct_out += "\t}\n"
1388                 elif meth_n == "eq" and return_type_info.java_hu_ty == "boolean":
1389                     extra_java_struct_out = "\t@Override public boolean equals(Object o) {\n"
1390                     extra_java_struct_out += "\t\tif (!(o instanceof " + struct_meth + ")) return false;\n"
1391                     extra_java_struct_out += "\t\treturn this.eq((" + struct_meth + ")o);\n"
1392                     extra_java_struct_out += "\t}\n"
1393                 out_java_struct += ("\tpublic " + return_type_info.java_hu_ty + " " + meth_n + "(")
1394             for idx, arg in enumerate(argument_types):
1395                 if idx != 0:
1396                     if not takes_self or idx > 1:
1397                         out_java_struct += ", "
1398                 elif takes_self:
1399                     continue
1400                 if arg.java_ty != "void":
1401                     if arg.arg_name in default_constructor_args:
1402                         assert not arg.nullable
1403                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1404                             if explode_idx != 0:
1405                                 out_java_struct += (", ")
1406                             out_java_struct += (
1407                                 explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
1408                     else:
1409                         if arg.nullable:
1410                             out_java_struct += "@Nullable "
1411                         ty_string = arg.java_hu_ty
1412                         if arg.java_fn_ty_arg[0] == "L" and arg.java_fn_ty_arg[len(arg.java_fn_ty_arg) - 1] == ";":
1413                             ty_string = arg.java_fn_ty_arg.strip("L;").replace("/", ".")
1414                         out_java_struct += ty_string + " " + arg.arg_name
1415         out_java += (");\n")
1416         out_c += (") {\n")
1417         if out_java_struct is not None:
1418             out_java_struct += (") {\n")
1419         for info in argument_types:
1420             if info.arg_conv is not None:
1421                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1422         if return_type_info.ret_conv is not None:
1423             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1424         elif return_type_info.c_ty != "void":
1425             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1426         else:
1427             out_c += ("\t")
1428         if c_call_string is None:
1429             out_c += (method_name + "(")
1430         else:
1431             out_c += (c_call_string)
1432         for idx, info in enumerate(argument_types):
1433             if info.arg_conv_name is not None:
1434                 if idx != 0:
1435                     out_c += (", ")
1436                 elif c_call_string is not None:
1437                     continue
1438                 out_c += (info.arg_conv_name)
1439         out_c += (")")
1440         if return_type_info.ret_conv is not None:
1441             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1442         else:
1443             out_c += (";")
1444         for info in argument_types:
1445             if info.arg_conv_cleanup is not None:
1446                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1447         if return_type_info.ret_conv is not None:
1448             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1449         elif return_type_info.c_ty != "void":
1450             out_c += ("\n\treturn ret_val;")
1451         out_c += ("\n}\n\n")
1452
1453         if args_known:
1454             out_java_struct += ("\t\t")
1455             if return_type_info.java_ty != "void":
1456                 out_java_struct += (return_type_info.java_ty + " ret = ")
1457             out_java_struct += ("bindings." + method_name + "(")
1458             for idx, info in enumerate(argument_types):
1459                 if idx != 0:
1460                     out_java_struct += (", ")
1461                 if idx == 0 and takes_self:
1462                     out_java_struct += ("this.ptr")
1463                 elif info.arg_name in default_constructor_args:
1464                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1465                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1466                         if explode_idx != 0:
1467                             out_java_struct += (", ")
1468                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1469                         if explode_arg.from_hu_conv is not None:
1470                             out_java_struct += (
1471                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1472                         else:
1473                             out_java_struct += (expl_arg_name)
1474                     out_java_struct += (")")
1475                 elif info.from_hu_conv is not None:
1476                     out_java_struct += (info.from_hu_conv[0])
1477                 else:
1478                     out_java_struct += (info.arg_name)
1479             out_java_struct += (");\n")
1480
1481             # This is completely nuts. The OpenJDK JRE JIT will optimize out a object which is on
1482             # the stack, calling its finalizer immediately even if member methods are *actively
1483             # executing* on the same object, as long as said object is on the stack. There is no
1484             # concrete specification for when the optimizer is allowed to do this, and when it is
1485             # not, so there is absolutely no way to be certain that this fix suffices.
1486             #
1487             # Instead, the "Java Language Specification" says only that an object is reachable
1488             # (i.e. will not yet be finalized) if it "can be accessed in any potential continuing
1489             # computation from any live thread". To any sensible reader this would mean actively
1490             # executing a member function on an object would make it not eligible for finalization.
1491             # But, no, dear reader, this statement does not say that. Well, okay, it says that,
1492             # very explicitly in fact, but those are just, like, words, man.
1493             #
1494             # In the seemingly non-normative text further down, a few examples of things the
1495             # optimizer can do are given, including "if the values in an object's fields are
1496             # stored in registers[, t]he may then access the registers instead of the object, and
1497             # never access the object again[, implying] that the object is garbage". This appears
1498             # to fully contradict both the above statement, the API documentation in java.lang.ref
1499             # regarding when a reference is "strongly reachable", and basic common sense. There is
1500             # no concrete set of limitations stated, however, seemingly implying the JIT could
1501             # decide your code would run faster by simply garbage collecting everything
1502             # immediately, ensuring your code finishes soon, just by SEGFAULT. Thus, we're really
1503             # entirely flying blind here. We add some fences and hope that its sufficient, but
1504             # with no specification to rely on, we cannot be certain of anything.
1505             #
1506             # TL;DR: The Java Language "Specification" provides no real guarantees on when an
1507             # object will be considered available for garbage collection once the JIT kicks in, so
1508             # we put in some fences and hope to god the JIT doesn't get smarter/more broken.
1509             for idx, info in enumerate(argument_types):
1510                 if idx == 0 and takes_self:
1511                     out_java_struct += ("\t\tReference.reachabilityFence(this);\n")
1512                 elif info.arg_name in default_constructor_args:
1513                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1514                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1515                         out_java_struct += ("\t\tReference.reachabilityFence(" + expl_arg_name + ");\n")
1516                 elif info.c_ty != "void":
1517                     out_java_struct += ("\t\tReference.reachabilityFence(" + info.arg_name + ");\n")
1518
1519             if return_type_info.java_ty == "long" and return_type_info.java_hu_ty != "long":
1520                 out_java_struct += "\t\tif (ret >= 0 && ret <= 4096) { return null; }\n"
1521
1522             if return_type_info.to_hu_conv is not None:
1523                 if not takes_self:
1524                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1525                                                                                                                return_type_info.to_hu_conv_name) + "\n")
1526                 else:
1527                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1528
1529             for idx, info in enumerate(argument_types):
1530                 if idx == 0 and takes_self:
1531                     pass
1532                 elif info.arg_name in default_constructor_args:
1533                     for explode_arg in default_constructor_args[info.arg_name]:
1534                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1535                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1536                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1537                                                                                                expl_arg_name).replace(
1538                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1539                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1540                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1541                         out_java_struct += (
1542                             "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1543                     else:
1544                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1545
1546             if takes_self and not takes_self_as_ref:
1547                 out_java_struct += "\t\t" + argument_types[0].from_hu_conv[1].replace("\n", "\n\t\t").replace("this_arg", "this") + ";\n"
1548             if return_type_info.to_hu_conv_name is not None:
1549                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1550             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1551                 out_java_struct += ("\t\treturn ret;\n")
1552             out_java_struct += ("\t}\n\n")
1553
1554         return (out_java, out_c, out_java_struct + extra_java_struct_out)
1555
1556     def cleanup(self):
1557         pass