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

   1 from bindingstypes import *
   2 from enum import Enum
   3 import sys
   4
   5 class Target(Enum):
   6     CSHARP = 1,
   7
   8 class Consts:
   9     def __init__(self, DEBUG: bool, target: Target, **kwargs):
  10         self.target = target
  11         self.c_array_class_caches = set()
  12         self.c_type_map = dict(
  13             bool = ['bool'],
  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 = """
  32 using org.ldk.enums;
  33 using org.ldk.impl;
  34 using System.Runtime.InteropServices;
  35
  36 namespace org { namespace ldk { namespace impl {
  37
  38 internal class bindings {
  39         /*static {
  40                 init(java.lang.Enum.class, VecOrSliceDef.class);
  41                 init_class_cache();
  42                 if (!get_lib_version_string().equals(version.get_ldk_java_bindings_version()))
  43                         throw new ArgumentException("Compiled LDK library and LDK class failes do not match");
  44                 // Fetching the LDK versions from C also checks that the header and binaries match
  45                 Console.Error.WriteLine("Loaded LDK-Java Bindings " + version.get_ldk_java_bindings_version() + " with LDK " + get_ldk_version() + " and LDK-C-Bindings " + get_ldk_c_bindings_version());
  46         }*/
  47         //static extern void init(java.lang.Class c);
  48         //static native void init_class_cache();
  49 """
  50         self.bindings_header += self.native_meth_decl("get_lib_version_string", "string") + "();\n"
  51         self.bindings_header += self.native_meth_decl("get_ldk_c_bindings_version", "string") + "();\n"
  52         self.bindings_header += self.native_meth_decl("get_ldk_version", "string") + "();\n\n"
  53
  54         self.bindings_version_file = """
  55
  56 public class version {
  57         public static string get_ldk_java_bindings_version() {
  58                 return "<git_version_ldk_garbagecollected>";
  59         }
  60 }"""
  61
  62         self.util_fn_pfx = """using org.ldk.impl;
  63 using org.ldk.enums;
  64 using org.ldk.util;
  65 using org.ldk.structs;
  66 using System;
  67
  68 namespace org { namespace ldk { namespace util {
  69 public class UtilMethods {
  70 """
  71         self.util_fn_sfx = "} } } }"
  72         self.common_base = """using System.Collections.Generic;
  73 using System.Diagnostics;
  74
  75 public class CommonBase {
  76         protected internal long ptr;
  77         protected internal LinkedList<object> ptrs_to = new LinkedList<object>();
  78         protected CommonBase(long ptr) { Trace.Assert(ptr < 0 || ptr > 4096); this.ptr = ptr; }
  79 }
  80 """
  81
  82         self.txout_defn = """public class TxOut : CommonBase {
  83         /** The script_pubkey in this output */
  84         public readonly byte[] script_pubkey;
  85         /** The value, in satoshis, of this output */
  86         public readonly long value;
  87
  88     internal TxOut(object _dummy, long ptr) : base(ptr) {
  89                 this.script_pubkey = bindings.TxOut_get_script_pubkey(ptr);
  90                 this.value = bindings.TxOut_get_value(ptr);
  91         }
  92     public TxOut(long value, byte[] script_pubkey) : base(bindings.TxOut_new(script_pubkey, value)) {
  93                 this.script_pubkey = bindings.TxOut_get_script_pubkey(ptr);
  94                 this.value = bindings.TxOut_get_value(ptr);
  95         }
  96
  97         ~TxOut() {
  98                 if (ptr != 0) { bindings.TxOut_free(ptr); }
  99         }
 100 }"""
 101
 102         self.scalar_defn = """public class BigEndianScalar : CommonBase {
 103         /** The bytes of the scalar value, in big endian */
 104         public readonly byte[] scalar_bytes;
 105
 106     internal BigEndianScalar(object _dummy, long ptr) : base(ptr) {
 107                 this.scalar_bytes = bindings.BigEndianScalar_get_bytes(ptr);
 108         }
 109     public BigEndianScalar(byte[] scalar_bytes) : base(bindings.BigEndianScalar_new(scalar_bytes)) {
 110                 this.scalar_bytes = bindings.BigEndianScalar_get_bytes(ptr);
 111         }
 112
 113         ~BigEndianScalar() {
 114                 if (ptr != 0) { bindings.BigEndianScalar_free(ptr); }
 115         }
 116 }"""
 117
 118
 119         self.c_file_pfx = """
 120 // On OSX jlong (ie long long) is not equivalent to int64_t, so we override here
 121 #define int64_t jlong
 122 #include <lightning.h>
 123 #include <string.h>
 124 #include <stdatomic.h>
 125 #include <stdlib.h>
 126
 127 #define LIKELY(v) __builtin_expect(!!(v), 1)
 128 #define UNLIKELY(v) __builtin_expect(!!(v), 0)
 129
 130 """
 131
 132         self.c_file_pfx = self.c_file_pfx + "#include <stdio.h>\n#define DEBUG_PRINT(...) fprintf(stderr, __VA_ARGS__)\n"
 133
 134         if not DEBUG or sys.platform == "darwin":
 135             self.c_file_pfx = self.c_file_pfx + """#define MALLOC(a, _) malloc(a)
 136 #define FREE(p) if ((uint64_t)(p) > 4096) { free(p); }
 137 #define CHECK_ACCESS(p)
 138 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v)
 139 """
 140         if not DEBUG:
 141             self.c_file_pfx += """#define DO_ASSERT(a) (void)(a)
 142 #define CHECK(a)
 143 """
 144         if DEBUG:
 145             self.c_file_pfx = self.c_file_pfx + """#include <assert.h>
 146 // Always run a, then assert it is true:
 147 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 148 // Assert a is true or do nothing
 149 #define CHECK(a) DO_ASSERT(a)
 150
 151 void __attribute__((constructor)) debug_log_version() {
 152         if (check_get_ldk_version() == NULL)
 153                 DEBUG_PRINT("LDK version did not match the header we built against\\n");
 154         if (check_get_ldk_bindings_version() == NULL)
 155                 DEBUG_PRINT("LDK C Bindings version did not match the header we built against\\n");
 156 }
 157 """
 158
 159             if sys.platform != "darwin":
 160                 self.c_file_pfx += """
 161 // Running a leak check across all the allocations and frees of the JDK is a mess,
 162 // so instead we implement our own naive leak checker here, relying on the -wrap
 163 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 164 // and free'd in Rust or C across the generated bindings shared library.
 165 #include <threads.h>
 166 """
 167
 168                 self.c_file_pfx = self.c_file_pfx + "#include <execinfo.h>\n"
 169                 self.c_file_pfx = self.c_file_pfx + """
 170 #include <unistd.h>
 171 #include <pthread.h>
 172 static pthread_mutex_t allocation_mtx;
 173
 174 void __attribute__((constructor)) init_mtx() {
 175         DO_ASSERT(!pthread_mutex_init(&allocation_mtx, NULL));
 176 }
 177
 178 #define BT_MAX 128
 179 typedef struct allocation {
 180         struct allocation* next;
 181         void* ptr;
 182         const char* struct_name;
 183         void* bt[BT_MAX];
 184         int bt_len;
 185         unsigned long alloc_len;
 186 } allocation;
 187 static allocation* allocation_ll = NULL;
 188
 189 void* __real_malloc(size_t len);
 190 void* __real_calloc(size_t nmemb, size_t len);
 191 static void new_allocation(void* res, const char* struct_name, size_t len) {
 192         allocation* new_alloc = __real_malloc(sizeof(allocation));
 193         new_alloc->ptr = res;
 194         new_alloc->struct_name = struct_name;
 195         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 196         new_alloc->alloc_len = len;
 197         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 198         new_alloc->next = allocation_ll;
 199         allocation_ll = new_alloc;
 200         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 201 }
 202 static void* MALLOC(size_t len, const char* struct_name) {
 203         void* res = __real_malloc(len);
 204         new_allocation(res, struct_name, len);
 205         return res;
 206 }
 207 void __real_free(void* ptr);
 208 static void alloc_freed(void* ptr) {
 209         allocation* p = NULL;
 210         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 211         allocation* it = allocation_ll;
 212         while (it->ptr != ptr) {
 213                 p = it; it = it->next;
 214                 if (it == NULL) {
 215                         DEBUG_PRINT("ERROR: Tried to free unknown pointer %p at:\\n", ptr);
 216                         void* bt[BT_MAX];
 217                         int bt_len = backtrace(bt, BT_MAX);
 218                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 219                         DEBUG_PRINT("\\n\\n");
 220                         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 221                         return; // addrsan should catch malloc-unknown and print more info than we have
 222                 }
 223         }
 224         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 225         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 226         DO_ASSERT(it->ptr == ptr);
 227         __real_free(it);
 228 }
 229 static void FREE(void* ptr) {
 230         if ((uint64_t)ptr <= 4096) return; // Rust loves to create pointers to the NULL page for dummys
 231         alloc_freed(ptr);
 232         __real_free(ptr);
 233 }
 234
 235 void* __wrap_malloc(size_t len) {
 236         void* res = __real_malloc(len);
 237         new_allocation(res, "malloc call", len);
 238         return res;
 239 }
 240 void* __wrap_calloc(size_t nmemb, size_t len) {
 241         void* res = __real_calloc(nmemb, len);
 242         new_allocation(res, "calloc call", len);
 243         return res;
 244 }
 245 void __wrap_free(void* ptr) {
 246         if (ptr == NULL) return;
 247         alloc_freed(ptr);
 248         __real_free(ptr);
 249 }
 250
 251 static void CHECK_ACCESS(const void* ptr) {
 252         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 253         allocation* it = allocation_ll;
 254         while (it->ptr != ptr) {
 255                 it = it->next;
 256                 if (it == NULL) {
 257                         DEBUG_PRINT("ERROR: Tried to access unknown pointer %p at:\\n", ptr);
 258                         void* bt[BT_MAX];
 259                         int bt_len = backtrace(bt, BT_MAX);
 260                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 261                         DEBUG_PRINT("\\n\\n");
 262                         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 263                         return; // addrsan should catch and print more info than we have
 264                 }
 265         }
 266         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 267 }
 268 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v) \\
 269         if (v.is_owned && v.inner != NULL) { \\
 270                 const void *p = __unmangle_inner_ptr(v.inner); \\
 271                 if (p != NULL) { \\
 272                         CHECK_ACCESS(p); \\
 273                 } \\
 274         }
 275
 276 void* __real_realloc(void* ptr, size_t newlen);
 277 void* __wrap_realloc(void* ptr, size_t len) {
 278         if (ptr != NULL) alloc_freed(ptr);
 279         void* res = __real_realloc(ptr, len);
 280         new_allocation(res, "realloc call", len);
 281         return res;
 282 }
 283 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 284         // Rust doesn't seem to use reallocarray currently
 285         DO_ASSERT(false);
 286 }
 287
 288 void __attribute__((destructor)) check_leaks() {
 289         unsigned long alloc_count = 0;
 290         unsigned long alloc_size = 0;
 291         DEBUG_PRINT("The following LDK-allocated blocks still remain.\\n");
 292         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 293         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 294         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 295                 DEBUG_PRINT("%s %p (%lu bytes) remains:\\n", a->struct_name, a->ptr, a->alloc_len);
 296                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 297                 DEBUG_PRINT("\\n\\n");
 298                 alloc_count++;
 299                 alloc_size += a->alloc_len;
 300         }
 301         DEBUG_PRINT("%lu allocations remained for %lu bytes.\\n", alloc_count, alloc_size);
 302         DEBUG_PRINT("Note that this is only accurate if System.gc(); System.runFinalization()\\n");
 303         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 304 }
 305 """
 306         self.c_file_pfx = self.c_file_pfx + """
 307
 308 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 309 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 310 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 311 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 312
 313 _Static_assert(sizeof(void*) <= 8, "Pointers must fit into 64 bits");
 314
 315 typedef jlongArray int64_tArray;
 316 typedef jbyteArray int8_tArray;
 317
 318 static inline jstring str_ref_to_java(JNIEnv *env, const char* chars, size_t len) {
 319         // Sadly we need to create a temporary because Java can't accept a char* without a 0-terminator
 320         char* conv_buf = MALLOC(len + 1, "str conv buf");
 321         memcpy(conv_buf, chars, len);
 322         conv_buf[len] = 0;
 323         jstring ret = (*env)->NewStringUTF(env, conv_buf);
 324         FREE(conv_buf);
 325         return ret;
 326 }
 327 static inline LDKStr java_to_owned_str(JNIEnv *env, jstring str) {
 328         uint64_t str_len = (*env)->GetStringUTFLength(env, str);
 329         char* newchars = MALLOC(str_len + 1, "String chars");
 330         const char* jchars = (*env)->GetStringUTFChars(env, str, NULL);
 331         memcpy(newchars, jchars, str_len);
 332         newchars[str_len] = 0;
 333         (*env)->ReleaseStringUTFChars(env, str, jchars);
 334         LDKStr res = {
 335                 .chars = newchars,
 336                 .len = str_len,
 337                 .chars_is_owned = true
 338         };
 339         return res;
 340 }
 341
 342 const char* CS_LDK_get_ldk_c_bindings_version() {
 343         return str_ref_to_java(check_get_ldk_bindings_version(), strlen(check_get_ldk_bindings_version()));
 344 }
 345 const char* CS_LDK_get_ldk_version() {
 346         return str_ref_to_java(check_get_ldk_version(), strlen(check_get_ldk_version()));
 347 }
 348 #include "version.c"
 349 """
 350         self.c_version_file = """const char* CS_LDK_get_lib_version_string() {
 351         return "<git_version_ldk_garbagecollected>";
 352 }"""
 353
 354         self.hu_struct_file_prefix = """using org.ldk.impl;
 355 using org.ldk.enums;
 356 using org.ldk.util;
 357 using System;
 358
 359 namespace org { namespace ldk { namespace structs {
 360
 361 """
 362         self.hu_struct_file_suffix = "} } }\n"
 363         self.c_fn_args_pfx = ""
 364         self.c_fn_ty_pfx = ""
 365         self.file_ext = ".cs"
 366         self.ptr_c_ty = "int64_t"
 367         self.ptr_native_ty = "long"
 368         self.u128_native_ty = "UInt128"
 369         self.usize_c_ty = "int64_t"
 370         self.usize_native_ty = "long"
 371         self.native_zero_ptr = "0"
 372         self.result_c_ty = "jclass"
 373         self.ptr_arr = "jobjectArray"
 374         self.is_arr_some_check = ("", " != NULL")
 375         self.get_native_arr_len_call = ("(*env)->GetArrayLength(env, ", ")")
 376
 377         self.bindings_footer_wip = "\tstatic bindings() {\n"
 378     def bindings_footer(self):
 379         return self.bindings_footer_wip + "\t}\n}\n} } }\n"
 380
 381     def native_meth_decl(self, meth_name, ret_ty_str):
 382         return "\t[DllImport (\"ldkcsharp\", EntryPoint=\"CS_LDK_" + meth_name + "\")] public static extern " + ret_ty_str + " " + meth_name
 383
 384     def c_fn_name_define_pfx(self, fn_name, have_args):
 385         return " CS_LDK_" + fn_name + "("
 386
 387     def construct_jenv(self):
 388         res =  "JNIEnv *env;\n"
 389         res += "jint get_jenv_res = (*j_calls->vm)->GetEnv(j_calls->vm, (void**)&env, JNI_VERSION_1_6);\n"
 390         res += "if (get_jenv_res == JNI_EDETACHED) {\n"
 391         res += "\tDO_ASSERT((*j_calls->vm)->AttachCurrentThread(j_calls->vm, (void**)&env, NULL) == JNI_OK);\n"
 392         res += "} else {\n"
 393         res += "\tDO_ASSERT(get_jenv_res == JNI_OK);\n"
 394         res += "}\n"
 395         return res
 396     def deconstruct_jenv(self):
 397         res = "if (get_jenv_res == JNI_EDETACHED) {\n"
 398         res += "\tDO_ASSERT((*j_calls->vm)->DetachCurrentThread(j_calls->vm) == JNI_OK);\n"
 399         res += "}\n"
 400         return res
 401
 402     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 403         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 404             return "(*env)->ReleasePrimitiveArrayCritical(env, " + arr_var + ", " + arr_ptr_var + ", 0)"
 405         return None
 406     def create_native_arr_call(self, arr_len, ty_info):
 407         if ty_info.c_ty == "int8_tArray":
 408             return "(*env)->NewByteArray(env, " + arr_len + ")"
 409         elif ty_info.subty.c_ty.endswith("Array"):
 410             clz_var = ty_info.java_fn_ty_arg[1:].replace("[", "arr_of_")
 411             self.c_array_class_caches.add(clz_var)
 412             return "(*env)->NewObjectArray(env, " + arr_len + ", " + clz_var + "_clz, NULL);\n"
 413         else:
 414             return "(*env)->New" + ty_info.java_ty.strip("[]").title() + "Array(env, " + arr_len + ")"
 415     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 416         if ty_info.c_ty == "int8_tArray":
 417             return ("(*env)->SetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", ", ")")
 418         else:
 419             assert False
 420     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 421         if ty_info.c_ty == "int8_tArray":
 422             if copy:
 423                 return "(*env)->GetByteArrayRegion(env, " + arr_name + ", 0, " + arr_len + ", " + dest_name + ")"
 424             else:
 425                 return "(*env)->GetByteArrayElements (env, " + arr_name + ", NULL)"
 426         elif not ty_info.java_ty[:len(ty_info.java_ty) - 2].endswith("[]"):
 427             return "(*env)->Get" + ty_info.subty.java_ty.title() + "ArrayElements (env, " + arr_name + ", NULL)"
 428         else:
 429             return None
 430     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 431         if self.get_native_arr_contents(arr_name, "", "", ty_info, False) is None:
 432             return "(*env)->GetObjectArrayElement(env, " + arr_name + ", " + idxc + ")"
 433         else:
 434             assert False # Only called if above is None
 435     def get_native_arr_ptr_call(self, ty_info):
 436         if ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"):
 437             return None
 438         return ("(*env)->GetPrimitiveArrayCritical(env, ", ", NULL)")
 439     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 440         if ty_info.subty is None or not ty_info.subty.c_ty.endswith("Array"):
 441             return None
 442         return "(*env)->SetObjectArrayElement(env, " + arr_name + ", " + idxc + ", " + entry_access + ")"
 443     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 444         if ty_info.c_ty == "int8_tArray":
 445             return "(*env)->ReleaseByteArrayElements(env, " + arr_name + ", (int8_t*)" + dest_name + ", 0);"
 446         else:
 447             return "(*env)->Release" + ty_info.java_ty.strip("[]").title() + "ArrayElements(env, " + arr_name + ", " + dest_name + ", 0)"
 448
 449     def map_hu_array_elems(self, arr_name, conv_name, arr_ty, elem_ty):
 450         if elem_ty.java_hu_ty == "UInt5":
 451             return arr_name + " != null ? InternalUtils.convUInt5Array(" + arr_name + ") : null"
 452         elif elem_ty.java_hu_ty == "WitnessVersion":
 453             return arr_name + " != null ? InternalUtils.convWitnessVersionArray(" + arr_name + ") : null"
 454         else:
 455             return arr_name + " != null ? InternalUtils.mapArray(" + arr_name + ", " + conv_name + " => " + elem_ty.from_hu_conv[0] + ") : null"
 456
 457     def str_ref_to_native_call(self, var_name, str_len):
 458         return "str_ref_to_java(env, " + var_name + ", " + str_len + ")"
 459     def str_ref_to_c_call(self, var_name):
 460         return "java_to_owned_str(env, " + var_name + ")"
 461     def str_to_hu_conv(self, var_name):
 462         return None
 463     def str_from_hu_conv(self, var_name):
 464         return None
 465
 466     def init_str(self):
 467         return ""
 468
 469     def var_decl_statement(self, ty_string, var_name, statement):
 470         return ty_string + " " + var_name + " = " + statement
 471
 472     def get_java_arr_len(self, arr_name):
 473         return arr_name + ".Length"
 474     def get_java_arr_elem(self, elem_ty, arr_name, idx):
 475         return arr_name + "[" + idx + "]"
 476     def constr_hu_array(self, ty_info, arr_len):
 477         base_ty = ty_info.subty.java_hu_ty.split("[")[0].split("<")[0]
 478         conv = "new " + base_ty + "[" + arr_len + "]"
 479         if "[" in ty_info.subty.java_hu_ty.split("<")[0]:
 480             # Do a bit of a dance to move any excess [] to the end
 481             conv += "[" + ty_info.subty.java_hu_ty.split("<")[0].split("[")[1]
 482         return conv
 483     def cleanup_converted_native_array(self, ty_info, arr_name):
 484         return None
 485
 486     def primitive_arr_from_hu(self, arr_ty, fixed_len, arr_name):
 487         mapped_ty = arr_ty.subty
 488         if arr_ty.rust_obj == "LDKU128":
 489             return ("" + arr_name + ".getLEBytes()", "")
 490         if fixed_len is not None:
 491             return ("InternalUtils.check_arr_len(" + arr_name + ", " + fixed_len + ")", "")
 492         return None
 493     def primitive_arr_to_hu(self, arr_ty, fixed_len, arr_name, conv_name):
 494         if arr_ty.rust_obj == "LDKU128":
 495             return "org.ldk.util.UInt128 " + conv_name + " = new org.ldk.util.UInt128(" + arr_name + ");"
 496         return None
 497
 498     def java_arr_ty_str(self, elem_ty_str):
 499         return elem_ty_str + "[]"
 500
 501     def for_n_in_range(self, n, minimum, maximum):
 502         return "for (int " + n + " = " + minimum + "; " + n + " < " + maximum + "; " + n + "++) {"
 503     def for_n_in_arr(self, n, arr_name, arr_elem_ty):
 504         return ("foreach (" + arr_elem_ty.java_hu_ty + " " + n + " in " + arr_name + ") { ", " }")
 505
 506     def get_ptr(self, var):
 507         return var + ".ptr"
 508     def set_null_skip_free(self, var):
 509         return var + ".ptr" + " = 0;"
 510
 511     def add_ref(self, holder, referent):
 512         return "if (" + holder + " != null) { " + holder + ".ptrs_to.AddLast(" + referent + "); }"
 513
 514     def fully_qualified_hu_ty_path(self, ty):
 515         if ty.java_fn_ty_arg.startswith("L") and ty.java_fn_ty_arg.endswith(";"):
 516             return ty.java_hu_ty
 517         if ty.java_hu_ty == "UnqualifiedError" or ty.java_hu_ty == "UInt128" or ty.java_hu_ty == "UInt5" or ty.java_hu_ty == "WitnessVersion":
 518             return "org.ldk.util." + ty.java_hu_ty
 519         if not ty.is_native_primitive and ty.rust_obj is not None and not "[]" in ty.java_hu_ty:
 520             return "org.ldk.structs." + ty.java_hu_ty
 521         return ty.java_hu_ty
 522
 523     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 524         out_java_enum = "namespace org { namespace ldk { namespace enums {"
 525         out_java = ""
 526         out_c = ""
 527
 528         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_cs(int32_t ord) {\n"
 529         out_c += "\tswitch (ord) {\n"
 530
 531         if enum_doc_comment is not None:
 532             out_java_enum += "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
 533         out_java_enum += "public enum " + struct_name + " {\n"
 534         ord_v = 0
 535         for var, var_docs in variants:
 536             if var_docs is not None:
 537                 out_java_enum += "\t/**\n\t * " + var_docs.replace("\n", "\n\t * ") + "\n\t */\n"
 538             out_java_enum += "\t" + var + ",\n"
 539             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 540             ord_v = ord_v + 1
 541         out_java_enum += "}"
 542         out_c += "\t\tdefault: abort();\n"
 543         out_c += "\t}\n"
 544         out_c += "}\n"
 545
 546         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_cs(LDK" + struct_name + " val) {\n"
 547         out_c = out_c + "\tswitch (val) {\n"
 548         ord_v = 0
 549         for var, _ in variants:
 550             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 551             ord_v = ord_v + 1
 552         out_c = out_c + "\t\tdefault: abort();\n"
 553         out_c = out_c + "\t}\n"
 554         out_c = out_c + "}\n"
 555
 556         return (out_c, out_java_enum + "} } }\n", out_java)
 557
 558     def c_unitary_enum_to_native_call(self, ty_info):
 559         return (ty_info.rust_obj + "_to_cs(", ")")
 560     def native_unitary_enum_to_c_call(self, ty_info):
 561         return (ty_info.rust_obj + "_from_cs(", ")")
 562
 563     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 564         out_c = ""
 565         for var in variants:
 566             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 567             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 568         out_c += "void" + self.c_fn_name_define_pfx(struct_name.replace("_", "_1") + "_init", True) + self.c_fn_args_pfx + ") {\n"
 569         for var_name in variants:
 570             out_c += "\t" + struct_name + "_" + var_name + "_class =\n"
 571             out_c += "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"org/ldk/impl/bindings$" + struct_name + "$" + var_name + "\"));\n"
 572             out_c += "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 573             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"
 574             out_c += "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 575         out_c = out_c + "}\n"
 576         return out_c
 577
 578     def c_complex_enum_pass_ty(self, struct_name):
 579         return "jobject"
 580
 581     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 582         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 583         for param in c_params:
 584             ret = ret + ", " + param
 585         return ret + ")"
 586
 587     def native_c_map_trait(self, struct_name, field_vars, flattened_field_vars, field_fns, trait_doc_comment):
 588         out_java_trait = ""
 589         out_java = ""
 590
 591         # First generate most of the Java code, note that we need information about java method argument strings for C
 592         out_java_trait += self.hu_struct_file_prefix
 593         if trait_doc_comment is not None:
 594             out_java_trait += "/**\n * " + trait_doc_comment.replace("\n", "\n * ") + "\n */\n"
 595         out_java_trait = out_java_trait + "public class " + struct_name.replace("LDK","") + " : CommonBase {\n"
 596         out_java_trait = out_java_trait + "\tinternal readonly bindings." + struct_name + " bindings_instance;\n"
 597         out_java_trait = out_java_trait + "\tinternal " + struct_name.replace("LDK", "") + "(object _dummy, long ptr) : base(ptr) { bindings_instance = null; }\n"
 598         out_java_trait = out_java_trait + "\tprivate " + struct_name.replace("LDK", "") + "(bindings." + struct_name + " arg"
 599         for var in flattened_field_vars:
 600             if isinstance(var, ConvInfo):
 601                 out_java_trait += ", " + var.java_hu_ty + " " + var.arg_name
 602             else:
 603                 out_java_trait += ", bindings." + var[0] + " " + var[1]
 604         out_java_trait += ") : base(bindings." + struct_name + "_new(arg"
 605         for var in flattened_field_vars:
 606             if isinstance(var, ConvInfo):
 607                 if var.from_hu_conv is not None:
 608                     out_java_trait = out_java_trait + ", " + var.from_hu_conv[0]
 609                 else:
 610                     out_java_trait = out_java_trait + ", " + var.arg_name
 611             else:
 612                 out_java_trait = out_java_trait + ", " + var[1]
 613         out_java_trait = out_java_trait + ")) {\n"
 614         out_java_trait = out_java_trait + "\t\tthis.ptrs_to.AddLast(arg);\n"
 615         for var in flattened_field_vars:
 616             if isinstance(var, ConvInfo):
 617                 if var.from_hu_conv is not None and var.from_hu_conv[1] != "":
 618                     out_java_trait = out_java_trait + "\t\t" + var.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n"
 619             else:
 620                 out_java_trait = out_java_trait + "\t\tthis.ptrs_to.AddLast(" + var[1] + ");\n"
 621         out_java_trait = out_java_trait + "\t\tthis.bindings_instance = arg;\n"
 622         out_java_trait = out_java_trait + "\t}\n"
 623         out_java_trait = out_java_trait + "\t~" + struct_name.replace("LDK","") + "() {\n"
 624         out_java_trait = out_java_trait + "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n"
 625         out_java_trait = out_java_trait + "\t}\n\n"
 626
 627         java_trait_wrapper = "\tprivate class " + struct_name + "Holder { internal " + struct_name.replace("LDK", "") + " held; }\n"
 628         java_trait_wrapper += "\tprivate class " + struct_name + "Impl : bindings." + struct_name + " {\n"
 629         java_trait_wrapper += "\t\tinternal " + struct_name + "Impl(" + struct_name.replace("LDK", "") + "Interface arg, " + struct_name + "Holder impl_holder) { this.arg = arg; this.impl_holder = impl_holder; }\n"
 630         java_trait_wrapper += "\t\tprivate " + struct_name.replace("LDK", "") + "Interface arg;\n"
 631         java_trait_wrapper += "\t\tprivate " + struct_name + "Holder impl_holder;\n"
 632         java_trait_constr = "\tpublic static " + struct_name.replace("LDK", "") + " new_impl(" + struct_name.replace("LDK", "") + "Interface arg"
 633         for var in flattened_field_vars:
 634             if isinstance(var, ConvInfo):
 635                 java_trait_constr += ", " + var.java_hu_ty + " " + var.arg_name
 636             else:
 637                 # Ideally we'd be able to take any instance of the interface, but our C code can only represent
 638                 # Java-implemented version, so we require users pass a Java implementation here :/
 639                 java_trait_constr += ", " + var[0].replace("LDK", "") + "." + var[0].replace("LDK", "") + "Interface " + var[1] + "_impl"
 640         java_trait_constr = java_trait_constr + ") {\n\t\t" + struct_name + "Holder impl_holder = new " + struct_name + "Holder();\n"
 641         java_trait_constr = java_trait_constr + "\t\timpl_holder.held = new " + struct_name.replace("LDK", "") + "(new " + struct_name + "Impl(arg, impl_holder)"
 642         out_java_trait += "\tpublic interface " + struct_name.replace("LDK", "") + "Interface {\n"
 643         out_java += "\tpublic interface " + struct_name + " {\n"
 644         java_meths = []
 645         for fn_line in field_fns:
 646             java_meth_descr = "("
 647             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 648                 fn_name = fn_line.fn_name
 649                 if fn_name == "lock": # reserved symbol
 650                     fn_name = "do_lock"
 651                 out_java += "\t\t" + fn_line.ret_ty_info.java_ty + " " + fn_name + "("
 652                 java_trait_wrapper += "\t\tpublic " + fn_line.ret_ty_info.java_ty + " " + fn_name + "("
 653                 out_java_trait += "\t\t/**\n\t\t * " + fn_line.docs.replace("\n", "\n\t\t * ") + "\n\t\t */\n"
 654                 out_java_trait += "\t\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_name + "("
 655
 656                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 657                     if idx >= 1:
 658                         out_java += ", "
 659                         java_trait_wrapper += ", "
 660                         out_java_trait += ", "
 661                     out_java += arg_conv_info.java_ty + " _" + arg_conv_info.arg_name
 662                     out_java_trait += arg_conv_info.java_hu_ty + " _" + arg_conv_info.arg_name
 663                     java_trait_wrapper += arg_conv_info.java_ty + " _" + arg_conv_info.arg_name
 664                     java_meth_descr = java_meth_descr + arg_conv_info.java_fn_ty_arg
 665                 java_meth_descr = java_meth_descr + ")" + fn_line.ret_ty_info.java_fn_ty_arg
 666                 java_meths.append((fn_line.fn_name, java_meth_descr))
 667
 668                 out_java += ");\n"
 669                 out_java_trait += ");\n"
 670                 java_trait_wrapper += ") {\n"
 671
 672                 for arg_info in fn_line.args_ty:
 673                     if arg_info.to_hu_conv is not None:
 674                         java_trait_wrapper += "\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t").replace(arg_info.arg_name, "_" + arg_info.arg_name) + "\n"
 675
 676                 if fn_line.ret_ty_info.java_ty != "void":
 677                     java_trait_wrapper += "\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_name + "("
 678                 else:
 679                     java_trait_wrapper += "\t\t\targ." + fn_name + "("
 680
 681                 for idx, arg_info in enumerate(fn_line.args_ty):
 682                     if idx != 0:
 683                         java_trait_wrapper += ", "
 684                     if arg_info.to_hu_conv_name is not None:
 685                         java_trait_wrapper += arg_info.to_hu_conv_name.replace(arg_info.arg_name, "_" + arg_info.arg_name)
 686                     else:
 687                         java_trait_wrapper += "_" + arg_info.arg_name
 688
 689                 java_trait_wrapper += ");\n"
 690                 java_trait_wrapper += "\t\t\t\tGC.KeepAlive(arg);\n"
 691                 if fn_line.ret_ty_info.java_ty != "void":
 692                     if fn_line.ret_ty_info.from_hu_conv is not None:
 693                         java_trait_wrapper += "\t\t\t" + fn_line.ret_ty_info.java_ty + " result = " + fn_line.ret_ty_info.from_hu_conv[0] + ";\n"
 694                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 695                             java_trait_wrapper += "\t\t\t" + fn_line.ret_ty_info.from_hu_conv[1].replace("this", "impl_holder.held") + ";\n"
 696                         java_trait_wrapper += "\t\t\treturn result;\n"
 697                     else:
 698                         java_trait_wrapper += "\t\t\treturn ret;\n"
 699                 java_trait_wrapper += "\t\t}\n"
 700         java_trait_wrapper += "\t}"
 701         for var in field_vars:
 702             if isinstance(var, ConvInfo):
 703                 java_trait_constr = java_trait_constr + ", " + var.arg_name
 704             else:
 705                 java_trait_constr += ", " + var[1] + ".new_impl(" + var[1] + "_impl"
 706                 for suparg in var[2]:
 707                     if isinstance(suparg, ConvInfo):
 708                         java_trait_constr += ", " + suparg.arg_name
 709                     else:
 710                         java_trait_constr += ", " + suparg[1]
 711                 java_trait_constr += ").bindings_instance"
 712                 for suparg in var[2]:
 713                     if isinstance(suparg, ConvInfo):
 714                         java_trait_constr += ", " + suparg.arg_name
 715                     else:
 716                         java_trait_constr += ", " + suparg[1]
 717         out_java_trait += "\t}\n" + java_trait_wrapper + "\n"
 718         out_java_trait += java_trait_constr + ");\n\t\treturn impl_holder.held;\n\t}\n"
 719
 720         out_java += "\t}\n"
 721
 722         out_java += self.native_meth_decl(struct_name + "_new", "long") + "(" + struct_name + " impl"
 723         for var in flattened_field_vars:
 724             if isinstance(var, ConvInfo):
 725                 out_java += ", " + var.java_ty + " " + var.arg_name
 726             else:
 727                 out_java += ", " + var[0] + " " + var[1]
 728         out_java += ");\n"
 729
 730         # Now that we've written out our java code (and created java_meths), generate C
 731         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 732         out_c = out_c + "\tatomic_size_t refcnt;\n"
 733         out_c = out_c + "\tJavaVM *vm;\n"
 734         out_c = out_c + "\tjweak o;\n"
 735         for var in flattened_field_vars:
 736             if isinstance(var, ConvInfo):
 737                 # We're a regular ol' field
 738                 pass
 739             else:
 740                 # We're a supertrait
 741                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 742         for fn in field_fns:
 743             if fn.fn_name != "free" and fn.fn_name != "cloned":
 744                 out_c = out_c + "\tjmethodID " + fn.fn_name + "_meth;\n"
 745         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 746
 747         for fn_line in field_fns:
 748             if fn_line.fn_name == "free":
 749                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 750                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 751                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 752                 out_c += "\t\t" + self.construct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 753                 out_c = out_c + "\t\t(*env)->DeleteWeakGlobalRef(env, j_calls->o);\n"
 754                 out_c += "\t\t" + self.deconstruct_jenv().replace("\n", "\n\t\t").strip() + "\n"
 755                 out_c = out_c + "\t\tFREE(j_calls);\n"
 756                 out_c = out_c + "\t}\n}\n"
 757
 758         for idx, fn_line in enumerate(field_fns):
 759             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 760                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 761                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 762                 if fn_line.self_is_const:
 763                     out_c = out_c + "const void* this_arg"
 764                 else:
 765                     out_c = out_c + "void* this_arg"
 766
 767                 for idx, arg in enumerate(fn_line.args_ty):
 768                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 769
 770                 out_c = out_c + ") {\n"
 771                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 772                 out_c += "\t" + self.construct_jenv().replace("\n", "\n\t").strip() + "\n"
 773
 774                 for arg_info in fn_line.args_ty:
 775                     if arg_info.ret_conv is not None:
 776                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 777                         out_c = out_c + arg_info.arg_name
 778                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 779
 780                 out_c = out_c + "\tjobject obj = (*env)->NewLocalRef(env, j_calls->o);\n\tCHECK(obj != NULL);\n"
 781                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 782                     out_c = out_c + "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 783                 elif fn_line.ret_ty_info.c_ty == "void":
 784                     out_c += "\t(*env)->CallVoidMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 785                 elif fn_line.ret_ty_info.java_hu_ty == "string" or "org/ldk/enums" in fn_line.ret_ty_info.java_fn_ty_arg:
 786                     # Manually write out string methods as they're just an Object
 787                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (*env)->CallObjectMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 788                 elif not fn_line.ret_ty_info.passed_as_ptr:
 789                     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"
 790                 else:
 791                     out_c = out_c + "\tuint64_t ret = (*env)->CallLongMethod(env, obj, j_calls->" + fn_line.fn_name + "_meth"
 792
 793                 for idx, arg_info in enumerate(fn_line.args_ty):
 794                     if arg_info.ret_conv is not None:
 795                         out_c = out_c + ", " + arg_info.ret_conv_name
 796                     else:
 797                         out_c = out_c + ", " + arg_info.arg_name
 798                 out_c = out_c + ");\n"
 799
 800                 out_c += "\tif (UNLIKELY((*env)->ExceptionCheck(env))) {\n"
 801                 out_c += "\t\t(*env)->ExceptionDescribe(env);\n"
 802                 out_c += "\t\t(*env)->FatalError(env, \"A call to " + fn_line.fn_name + " in " + struct_name + " from rust threw an exception.\");\n"
 803                 out_c += "\t}\n"
 804
 805                 if fn_line.ret_ty_info.arg_conv is not None:
 806                     out_c += "\t" + fn_line.ret_ty_info.arg_conv.replace("\n", "\n\t") + "\n"
 807                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
 808                     out_c += "\treturn " + fn_line.ret_ty_info.arg_conv_name + ";\n"
 809                 else:
 810                     out_c += "\t" + self.deconstruct_jenv().replace("\n", "\n\t").strip() + "\n"
 811                     if not fn_line.ret_ty_info.passed_as_ptr and fn_line.ret_ty_info.c_ty != "void":
 812                         out_c += "\treturn ret;\n"
 813
 814                 out_c = out_c + "}\n"
 815
 816         # If we can, write out a clone function whether we need one or not, as we use them in moving to rust
 817         can_clone_with_ptr = True
 818         for var in field_vars:
 819             if isinstance(var, ConvInfo):
 820                 can_clone_with_ptr = False
 821         if can_clone_with_ptr:
 822             out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
 823             out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
 824             out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 825             for var in field_vars:
 826                 if not isinstance(var, ConvInfo):
 827                     out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 828             out_c = out_c + "}\n"
 829
 830         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (" + self.c_fn_args_pfx + ", jobject o"
 831         for var in flattened_field_vars:
 832             if isinstance(var, ConvInfo):
 833                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 834             else:
 835                 out_c = out_c + ", jobject " + var[1]
 836         out_c = out_c + ") {\n"
 837
 838         out_c = out_c + "\tjclass c = (*env)->GetObjectClass(env, o);\n"
 839         out_c = out_c + "\tCHECK(c != NULL);\n"
 840         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 841         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 842         out_c = out_c + "\tDO_ASSERT((*env)->GetJavaVM(env, &calls->vm) == 0);\n"
 843         out_c = out_c + "\tcalls->o = (*env)->NewWeakGlobalRef(env, o);\n"
 844
 845         for (fn_name, java_meth_descr) in java_meths:
 846             if fn_name != "free" and fn_name != "cloned":
 847                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 848                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 849
 850         for var in flattened_field_vars:
 851             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 852                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 853         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 854         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 855         for fn_line in field_fns:
 856             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 857                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 858             elif fn_line.fn_name == "free":
 859                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 860             else:
 861                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
 862         for var in field_vars:
 863             if isinstance(var, ConvInfo):
 864                 if var.arg_conv_name is not None:
 865                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 866                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 867                 else:
 868                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 869                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 870             else:
 871                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(env, clz, " + var[1]
 872                 for suparg in var[2]:
 873                     if isinstance(suparg, ConvInfo):
 874                         out_c = out_c + ", " + suparg.arg_name
 875                     else:
 876                         out_c = out_c + ", " + suparg[1]
 877                 out_c += "),\n"
 878         out_c = out_c + "\t};\n"
 879         for var in flattened_field_vars:
 880             if not isinstance(var, ConvInfo):
 881                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 882         out_c = out_c + "\treturn ret;\n"
 883         out_c = out_c + "}\n"
 884
 885         out_c += "int64_t " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "jobject o"
 886         for var in flattened_field_vars:
 887             if isinstance(var, ConvInfo):
 888                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 889             else:
 890                 out_c = out_c + ", jobject " + var[1]
 891         out_c = out_c + ") {\n"
 892         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 893         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(env, clz, o"
 894         for var in flattened_field_vars:
 895             if isinstance(var, ConvInfo):
 896                 out_c = out_c + ", " + var.arg_name
 897             else:
 898                 out_c = out_c + ", " + var[1]
 899         out_c = out_c + ");\n"
 900         out_c = out_c + "\treturn tag_ptr(res_ptr, true);\n"
 901         out_c = out_c + "}\n"
 902
 903         for var in flattened_field_vars:
 904             if not isinstance(var, ConvInfo):
 905                 out_java_trait += "\n\t/**\n"
 906                 out_java_trait += "\t * Gets the underlying " + var[1] + ".\n"
 907                 out_java_trait += "\t */\n"
 908                 underscore_name = ''.join('_' + c.lower() if c.isupper() else c for c in var[1]).strip('_')
 909                 out_java_trait += "\tpublic " + var[1] + " get_" + underscore_name + "() {\n"
 910                 out_java_trait += "\t\t" + var[1] + " res = new " + var[1] + "(null, bindings." + struct_name + "_get_" + var[1] + "(this.ptr));\n"
 911                 out_java_trait += "\t\tthis.ptrs_to.AddLast(res);\n"
 912                 out_java_trait += "\t\treturn res;\n"
 913                 out_java_trait += "\t}\n"
 914                 out_java_trait += "\n"
 915
 916                 out_java += self.native_meth_decl(struct_name + "_get_" + var[1], "long") + "(long arg);\n"
 917
 918                 out_c += "int64_t " + self.c_fn_name_define_pfx(struct_name + "_get_" + var[1], True) + "int64_t arg) {\n"
 919                 out_c += "\t" + struct_name + " *inp = (" + struct_name + " *)untag_ptr(arg);\n"
 920                 out_c += "\treturn tag_ptr(&inp->" + var[1] + ", false);\n"
 921                 out_c += "}\n"
 922
 923         return (out_java, out_java_trait, out_c)
 924
 925     def trait_struct_inc_refcnt(self, ty_info):
 926         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
 927         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
 928         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_cloned(&" + ty_info.var_name + "_conv);\n}"
 929         return base_conv
 930
 931     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
 932         bindings_type = struct_name.replace("LDK", "")
 933         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
 934
 935         out_java_enum = ""
 936         out_java = ""
 937         out_c = ""
 938
 939         out_java_enum += (self.hu_struct_file_prefix)
 940
 941         java_hu_class = "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
 942         java_hu_class += "public class " + java_hu_type + " : CommonBase {\n"
 943         java_hu_class += f"\tprotected {java_hu_type}(object _dummy, long ptr) : base(ptr)" + " { }\n"
 944         java_hu_class += "\t~" + java_hu_type + "() {\n"
 945         java_hu_class += "\t\tif (ptr != 0) { bindings." + bindings_type + "_free(ptr); }\n"
 946         java_hu_class += "\t}\n\n"
 947         java_hu_class += f"\tinternal static {java_hu_type} constr_from_ptr(long ptr) {{\n"
 948         java_hu_class += f"\t\tlong raw_ty = bindings." + struct_name + "_ty_from_ptr(ptr);\n"
 949         out_c += self.c_fn_ty_pfx + "uint32_t" + self.c_fn_name_define_pfx(struct_name + "_ty_from_ptr", True) + self.ptr_c_ty + " ptr) {\n"
 950         out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)untag_ptr(ptr);\n"
 951         out_c += "\tswitch(obj->tag) {\n"
 952         java_hu_class += "\t\tswitch (raw_ty) {\n"
 953         java_hu_subclasses = ""
 954
 955         var_idx = 0
 956         for var in variant_list:
 957             java_hu_subclasses += "\t/** A " + java_hu_type + " of type " + var.var_name + " */\n"
 958             java_hu_subclasses += "\tpublic class " + java_hu_type + "_" + var.var_name + " : " + java_hu_type + " {\n"
 959             java_hu_class += f"\t\t\tcase {var_idx}: "
 960             java_hu_class += "return new " + java_hu_type + "_" + var.var_name + "(ptr);\n"
 961             out_c += f"\t\tcase {struct_name}_{var.var_name}: return {var_idx};\n"
 962             hu_conv_body = ""
 963             for idx, (field_ty, field_docs) in enumerate(var.fields):
 964                 if field_docs is not None:
 965                     java_hu_subclasses += "\t\t/**\n\t\t * " + field_docs.replace("\n", "\n\t\t * ") + "\n\t\t */\n"
 966                 java_hu_subclasses += f"\t\tpublic {field_ty.java_hu_ty} {field_ty.arg_name};\n"
 967                 if field_ty.to_hu_conv is not None:
 968                     hu_conv_body += f"\t\t\t{field_ty.java_ty} {field_ty.arg_name} = bindings.{struct_name}_{var.var_name}_get_{field_ty.arg_name}(ptr);\n"
 969                     hu_conv_body += f"\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 970                     hu_conv_body += f"\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 971                 else:
 972                     hu_conv_body += f"\t\t\tthis.{field_ty.arg_name} = bindings.{struct_name}_{var.var_name}_get_{field_ty.arg_name}(ptr);\n"
 973             java_hu_subclasses += "\t\tinternal " + java_hu_type + "_" + var.var_name + "(long ptr) : base(null, ptr) {\n"
 974             java_hu_subclasses += hu_conv_body
 975             java_hu_subclasses += "\t\t}\n\t}\n"
 976             var_idx += 1
 977         java_hu_class += "\t\t\tdefault:\n\t\t\t\tthrow new ArgumentException(\"Impossible enum variant\");\n\t\t}\n\t}\n\n"
 978         out_java += self.native_meth_decl(struct_name + "_ty_from_ptr", "long") + "(long ptr);\n"
 979         out_c += ("\t\tdefault: abort();\n")
 980         out_c += ("\t}\n}\n")
 981
 982         for var in variant_list:
 983             for idx, (field_map, _) in enumerate(var.fields):
 984                 fn_name = f"{struct_name}_{var.var_name}_get_{field_map.arg_name}"
 985                 out_c += self.c_fn_ty_pfx + field_map.c_ty + self.c_fn_name_define_pfx(fn_name, True) + self.ptr_c_ty + " ptr) {\n"
 986                 out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)untag_ptr(ptr);\n"
 987                 out_c += f"\tassert(obj->tag == {struct_name}_{var.var_name});\n"
 988                 if field_map.ret_conv is not None:
 989                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 990                     if var.tuple_variant:
 991                         out_c += "obj->" + camel_to_snake(var.var_name)
 992                     else:
 993                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
 994                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 995                     out_c += "\treturn " + field_map.ret_conv_name + ";\n"
 996                 else:
 997                     if var.tuple_variant:
 998                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + ";\n"
 999                     else:
1000                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name + ";\n"
1001                 out_c += "}\n"
1002                 out_java += self.native_meth_decl(fn_name, field_map.java_ty) + "(long ptr);\n"
1003         out_java_enum += java_hu_class
1004         out_java_enum += java_hu_subclasses
1005         return (out_java, out_java_enum, out_c)
1006
1007     def map_opaque_struct(self, struct_name, struct_doc_comment):
1008         out_opaque_struct_human = ""
1009         out_opaque_struct_human += self.hu_struct_file_prefix
1010         out_opaque_struct_human += "\n/**\n * " + struct_doc_comment.replace("\n", "\n * ") + "\n */\n"
1011         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
1012         out_opaque_struct_human += ("public class " + hu_name + " : CommonBase")
1013         if struct_name.startswith("LDKLocked") or struct_name.startswith("LDKReadOnly"):
1014             out_opaque_struct_human += (", IDisposable")
1015         out_opaque_struct_human += (" {\n")
1016         out_opaque_struct_human += ("\tinternal " + hu_name + "(object _dummy, long ptr) : base(ptr) { }\n")
1017         if struct_name.startswith("LDKLocked") or struct_name.startswith("LDKReadOnly"):
1018             out_opaque_struct_human += ("\tpublic void Dispose() {\n")
1019         else:
1020             out_opaque_struct_human += ("\t~" + hu_name + "() {\n")
1021         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
1022         out_opaque_struct_human += ("\t}\n\n")
1023         return out_opaque_struct_human
1024
1025     def map_tuple(self, struct_name):
1026         return self.map_opaque_struct(struct_name, "A Tuple")
1027
1028     def map_result(self, struct_name, res_map, err_map):
1029         human_ty = struct_name.replace("LDKCResult", "Result")
1030         java_hu_struct = ""
1031         java_hu_struct += self.hu_struct_file_prefix
1032         java_hu_struct += "public class " + human_ty + " : CommonBase {\n"
1033         java_hu_struct += "\t" + human_ty + "(object _dummy, long ptr) : base(ptr) { }\n"
1034         java_hu_struct += "\t~" + human_ty + "() {\n"
1035         java_hu_struct += "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n"
1036         java_hu_struct += "\t}\n\n"
1037         java_hu_struct += "\tinternal static " + human_ty + " constr_from_ptr(long ptr) {\n"
1038         java_hu_struct += "\t\tif (bindings." + struct_name.replace("LDK", "") + "_is_ok(ptr)) {\n"
1039         java_hu_struct += "\t\t\treturn new " + human_ty + "_OK(null, ptr);\n"
1040         java_hu_struct += "\t\t} else {\n"
1041         java_hu_struct += "\t\t\treturn new " + human_ty + "_Err(null, ptr);\n"
1042         java_hu_struct += "\t\t}\n"
1043         java_hu_struct += "\t}\n"
1044
1045         java_hu_struct += "\tpublic class " + human_ty + "_OK : " + human_ty + " {\n"
1046
1047         if res_map.java_hu_ty != "void":
1048             java_hu_struct += "\t\tpublic readonly " + res_map.java_hu_ty + " res;\n"
1049         java_hu_struct += "\t\tinternal " + human_ty + "_OK(object _dummy, long ptr) : base(_dummy, ptr) {\n"
1050         if res_map.java_hu_ty == "void":
1051             pass
1052         elif res_map.to_hu_conv is not None:
1053             java_hu_struct += "\t\t\t" + res_map.java_ty + " res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1054             java_hu_struct += "\t\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t\t")
1055             java_hu_struct += "\n\t\t\tthis.res = " + res_map.to_hu_conv_name + ";\n"
1056         else:
1057             java_hu_struct += "\t\t\tthis.res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1058         java_hu_struct += "\t\t}\n"
1059         java_hu_struct += "\t}\n\n"
1060
1061         java_hu_struct += "\tpublic class " + human_ty + "_Err : " + human_ty + " {\n"
1062         if err_map.java_hu_ty != "void":
1063             java_hu_struct += "\t\tpublic readonly " + err_map.java_hu_ty + " err;\n"
1064         java_hu_struct += "\t\tinternal " + human_ty + "_Err(object _dummy, long ptr) : base(_dummy, ptr) {\n"
1065         if err_map.java_hu_ty == "void":
1066             pass
1067         elif err_map.to_hu_conv is not None:
1068             java_hu_struct += "\t\t\t" + err_map.java_ty + " err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1069             java_hu_struct += "\t\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t\t")
1070             java_hu_struct += "\n\t\t\tthis.err = " + err_map.to_hu_conv_name + ";\n"
1071         else:
1072             java_hu_struct += "\t\t\tthis.err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1073         java_hu_struct += "\t\t}\n"
1074
1075         java_hu_struct += "\t}\n\n"
1076         return java_hu_struct
1077
1078     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):
1079         arg_name_repl = lambda s, arg_name: s.replace(arg_name, "_" + arg_name) if arg_name == "lock" or arg_name == "event" or arg_name == "params" else s
1080         out_java = ""
1081         out_c = ""
1082         out_java_struct = None
1083
1084         out_java += self.native_meth_decl(method_name, return_type_info.java_ty) + "("
1085         out_c += (return_type_info.c_ty)
1086         if return_type_info.ret_conv is not None:
1087             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1088         have_args = len(argument_types) > 1 or (len(argument_types) > 0 and argument_types[0].c_ty != "void")
1089         out_c += (" " + self.c_fn_name_define_pfx(method_name, have_args))
1090
1091         for idx, arg_conv_info in enumerate(argument_types):
1092             if idx != 0:
1093                 out_java += (", ")
1094                 out_c += (", ")
1095             if arg_conv_info.c_ty != "void":
1096                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1097                 out_java += (arg_conv_info.java_ty + " _" + arg_conv_info.arg_name) # Add a _ to avoid using reserved words
1098
1099         out_java_struct = ""
1100         extra_java_struct_out = ""
1101         if not args_known:
1102             out_java_struct += ("\t// Skipped " + method_name + "\n")
1103         else:
1104             if doc_comment is not None:
1105                 out_java_struct += "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
1106             hu_ret_ty = return_type_info.java_hu_ty
1107             if return_type_info.nullable:
1108                 #hu_ret_ty += "?" - apparently mono doesn't support the nullable stuff
1109                 pass
1110             if not takes_self:
1111                 if meth_n == "new":
1112                     out_java_struct += "\tpublic static " + hu_ret_ty + " of("
1113                 elif meth_n == "default":
1114                     out_java_struct += "\tpublic static " + hu_ret_ty + " with_default("
1115                 else:
1116                     out_java_struct += "\tpublic static " + hu_ret_ty + " " + meth_n + "("
1117             elif meth_n == "clone_ptr" or (struct_meth.startswith("LDKCResult") and (meth_n == "get_ok" or meth_n == "get_err")):
1118                 out_java_struct += "\tinternal " + hu_ret_ty + " " + meth_n + "("
1119             else:
1120                 if meth_n == "hash" and return_type_info.java_hu_ty == "long":
1121                     extra_java_struct_out = "\tpublic override int GetHashCode() {\n"
1122                     extra_java_struct_out += "\t\treturn (int)this.hash();\n"
1123                     extra_java_struct_out += "\t}\n"
1124                 elif meth_n == "eq" and return_type_info.java_hu_ty == "bool":
1125                     extra_java_struct_out = "\tpublic override bool Equals(object o) {\n"
1126                     extra_java_struct_out += "\t\tif (!(o is " + struct_meth + ")) return false;\n"
1127                     extra_java_struct_out += "\t\treturn this.eq((" + struct_meth + ")o);\n"
1128                     extra_java_struct_out += "\t}\n"
1129                 if meth_n == "lock":
1130                     out_java_struct += "\tpublic " + hu_ret_ty + " do_lock("
1131                 else:
1132                     out_java_struct += "\tpublic " + hu_ret_ty + " " + meth_n + "("
1133             for idx, arg in enumerate(argument_types):
1134                 if idx != 0:
1135                     if not takes_self or idx > 1:
1136                         out_java_struct += ", "
1137                 elif takes_self:
1138                     continue
1139                 if arg.java_ty != "void":
1140                     if arg.arg_name in default_constructor_args:
1141                         assert not arg.nullable
1142                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1143                             if explode_idx != 0:
1144                                 out_java_struct += (", ")
1145                             out_java_struct += (
1146                                 explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
1147                     else:
1148                         ty_string = arg.java_hu_ty
1149                         if arg.nullable:
1150                             #ty_string += "?" - apparently mono doesn't support the nullable stuff
1151                             pass
1152                         ty_string = self.fully_qualified_hu_ty_path(arg)
1153                         out_java_struct += ty_string + " " + arg_name_repl(arg.arg_name, arg.arg_name)
1154         out_java += (");\n")
1155         out_c += (") {\n")
1156         if out_java_struct is not None:
1157             out_java_struct += (") {\n")
1158         for info in argument_types:
1159             if info.arg_conv is not None:
1160                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1161         if return_type_info.ret_conv is not None:
1162             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1163         elif return_type_info.c_ty != "void":
1164             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1165         else:
1166             out_c += ("\t")
1167         if c_call_string is None:
1168             out_c += (method_name + "(")
1169         else:
1170             out_c += (c_call_string)
1171         for idx, info in enumerate(argument_types):
1172             if info.arg_conv_name is not None:
1173                 if idx != 0:
1174                     out_c += (", ")
1175                 elif c_call_string is not None:
1176                     continue
1177                 out_c += (info.arg_conv_name)
1178         out_c += (")")
1179         if return_type_info.ret_conv is not None:
1180             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1181         else:
1182             out_c += (";")
1183         for info in argument_types:
1184             if info.arg_conv_cleanup is not None:
1185                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1186         if return_type_info.ret_conv is not None:
1187             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1188         elif return_type_info.c_ty != "void":
1189             out_c += ("\n\treturn ret_val;")
1190         out_c += ("\n}\n\n")
1191
1192         if args_known:
1193             out_java_struct += ("\t\t")
1194             if return_type_info.java_ty != "void":
1195                 out_java_struct += (return_type_info.java_ty + " ret = ")
1196             out_java_struct += ("bindings." + method_name + "(")
1197             for idx, info in enumerate(argument_types):
1198                 if idx != 0:
1199                     out_java_struct += (", ")
1200                 if idx == 0 and takes_self:
1201                     out_java_struct += ("this.ptr")
1202                 elif info.arg_name in default_constructor_args:
1203                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1204                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1205                         if explode_idx != 0:
1206                             out_java_struct += (", ")
1207                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1208                         if explode_arg.from_hu_conv is not None:
1209                             out_java_struct += (
1210                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1211                         else:
1212                             out_java_struct += (expl_arg_name)
1213                     out_java_struct += (")")
1214                 elif info.from_hu_conv is not None:
1215                     out_java_struct += arg_name_repl(info.from_hu_conv[0], info.arg_name)
1216                 else:
1217                     out_java_struct += arg_name_repl(info.arg_name, info.arg_name)
1218             out_java_struct += (");\n")
1219
1220             # Like Java, the C# GC is quite aggressive and can finalize an object while a method
1221             # on it is operating. Unlike Java, this behavior appears to be better documented,
1222             # which is nice.
1223             for idx, info in enumerate(argument_types):
1224                 if idx == 0 and takes_self:
1225                     out_java_struct += ("\t\tGC.KeepAlive(this);\n")
1226                 elif info.arg_name in default_constructor_args:
1227                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1228                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1229                         out_java_struct += ("\t\tGC.KeepAlive(" + expl_arg_name + ");\n")
1230                 elif info.c_ty != "void":
1231                     out_java_struct += ("\t\tGC.KeepAlive(" + arg_name_repl(info.arg_name, info.arg_name) + ");\n")
1232
1233             if return_type_info.java_ty == "long" and return_type_info.java_hu_ty != "long":
1234                 out_java_struct += "\t\tif (ret >= 0 && ret <= 4096) { return null; }\n"
1235
1236             if return_type_info.to_hu_conv is not None:
1237                 if not takes_self:
1238                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t")
1239                         .replace("this", return_type_info.to_hu_conv_name) + "\n")
1240                 else:
1241                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1242
1243             for idx, info in enumerate(argument_types):
1244                 if idx == 0 and takes_self:
1245                     pass
1246                 elif info.arg_name in default_constructor_args:
1247                     for explode_arg in default_constructor_args[info.arg_name]:
1248                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1249                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1250                             out_java_struct += ("\t\t" +
1251                                 arg_name_repl(explode_arg.from_hu_conv[1], info.arg_name)
1252                                 .replace(explode_arg.arg_name, expl_arg_name)
1253                                 .replace("this", return_type_info.to_hu_conv_name) + ";\n")
1254                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1255                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1256                         out_java_struct += ("\t\t" + arg_name_repl(info.from_hu_conv[1], info.arg_name)
1257                             .replace("this", return_type_info.to_hu_conv_name)
1258                             .replace("\n", "\n\t\t") + ";\n")
1259                     else:
1260                         out_java_struct += ("\t\t" + arg_name_repl(info.from_hu_conv[1], info.arg_name)
1261                             .replace("\n", "\n\t\t") + ";\n")
1262
1263             if takes_self and not takes_self_as_ref:
1264                 out_java_struct += "\t\t" + argument_types[0].from_hu_conv[1].replace("\n", "\n\t\t").replace("this_arg", "this") + ";\n"
1265             if return_type_info.to_hu_conv_name is not None:
1266                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1267             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1268                 out_java_struct += ("\t\treturn ret;\n")
1269             out_java_struct += ("\t}\n\n")
1270
1271         return (out_java, out_c, out_java_struct + extra_java_struct_out)
1272
1273     def cleanup(self):
1274         pass