_ 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     WINDOWS = 1,
   7     LINUX = 2,
   8     PTHREAD = 3,
   9
  10 def first_to_lower(string: str) -> str:
  11     first = string[0]
  12     return first.lower() + string[1:]
  13
  14 def safe_arg_name(arg_name):
  15     return "_" + arg_name if arg_name == "lock" or arg_name == "event" or arg_name == "params" else arg_name
  16
  17 def arg_name_repl(s, arg_name):
  18     return s.replace(arg_name, "_" + arg_name) if arg_name == "lock" or arg_name == "event" or arg_name == "params" else s
  19
  20 class Consts:
  21     def __init__(self, DEBUG: bool, target: Target, outdir: str, **kwargs):
  22         self.outdir = outdir
  23         self.target = target
  24         self.c_array_class_caches = set()
  25         self.function_ptr_counter = 0
  26         self.function_ptrs = {}
  27         self.c_type_map = dict(
  28             bool = ['bool', 'long', 'bool[]'],
  29             uint8_t = ['byte', 'long', 'byte[]'],
  30             uint16_t = ['short', 'long', 'short[]'],
  31             uint32_t = ['int', 'long', 'int[]'],
  32             uint64_t = ['long', 'long', 'long[]'],
  33             int64_t = ['long', 'long', 'long[]'],
  34             double = ['double', 'long', 'double[]'],
  35         )
  36         self.java_type_map = dict(
  37             String = "long"
  38         )
  39         self.java_hu_type_map = dict(
  40             String = "string"
  41         )
  42
  43         self.to_hu_conv_templates = dict(
  44             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}); }',
  45             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}); }'
  46         )
  47
  48         self.bindings_header = """
  49 using org.ldk.enums;
  50 using org.ldk.impl;
  51 using System;
  52 using System.Collections.Generic;
  53 using System.Runtime.InteropServices;
  54
  55 namespace org { namespace ldk { namespace impl {
  56
  57 internal class bindings {
  58         static List<WeakReference> js_objs = new List<WeakReference>();
  59
  60 """
  61         self.bindings_header += self.native_meth_decl("get_lib_version_string", "string") + "();\n"
  62         self.bindings_header += self.native_meth_decl("get_ldk_c_bindings_version", "string") + "();\n"
  63         self.bindings_header += self.native_meth_decl("get_ldk_version", "string") + "();\n\n"
  64         self.bindings_header += self.native_meth_decl("allocate_buffer", "long") + "(long buflen);\n\n"
  65         self.bindings_header += self.native_meth_decl("free_buffer", "void") + "(long buf);\n\n"
  66
  67         self.bindings_version_file = """
  68
  69 public class version {
  70         public static string get_ldk_java_bindings_version() {
  71                 return "<git_version_ldk_garbagecollected>";
  72         }
  73 }"""
  74
  75         self.util_fn_pfx = """using org.ldk.impl;
  76 using org.ldk.enums;
  77 using org.ldk.util;
  78 using org.ldk.structs;
  79 using System;
  80
  81 namespace org { namespace ldk { namespace util {
  82 public class UtilMethods {
  83 """
  84         self.util_fn_sfx = "} } } }"
  85         self.common_base = """using System.Collections.Generic;
  86 using System.Diagnostics;
  87
  88 public class CommonBase {
  89         protected internal long ptr;
  90         protected internal LinkedList<object> ptrs_to = new LinkedList<object>();
  91         protected CommonBase(long ptr) { Trace.Assert(ptr < 0 || ptr > 4096); this.ptr = ptr; }
  92 }
  93 """
  94
  95         self.txin_defn = """public class TxIn : CommonBase {
  96         /** The witness in this input, in serialized form */
  97         public readonly byte[] witness;
  98         /** The script_sig in this input */
  99         public readonly byte[] script_sig;
 100         /** The transaction output's sequence number */
 101         public readonly int sequence;
 102         /** The txid this input is spending */
 103         public readonly byte[] previous_txid;
 104         /** The output index within the spent transaction of the output this input is spending */
 105         public readonly int previous_vout;
 106
 107         internal TxIn(object _dummy, long ptr) : base(ptr) {
 108                 this.witness = InternalUtils.decodeUint8Array(bindings.TxIn_get_witness(ptr));
 109                 this.script_sig = InternalUtils.decodeUint8Array(bindings.TxIn_get_script_sig(ptr));
 110                 this.sequence = bindings.TxIn_get_sequence(ptr);
 111                 this.previous_txid = InternalUtils.decodeUint8Array(bindings.TxIn_get_previous_txid(ptr));
 112                 this.previous_vout = bindings.TxIn_get_previous_vout(ptr);
 113         }
 114         public TxIn(byte[] witness, byte[] script_sig, int sequence, byte[] previous_txid, int previous_vout)
 115         : this(null, bindings.TxIn_new(InternalUtils.encodeUint8Array(witness), InternalUtils.encodeUint8Array(script_sig), sequence, InternalUtils.encodeUint8Array(previous_txid), previous_vout)) {}
 116
 117         ~TxIn() {
 118                 if (ptr != 0) { bindings.TxIn_free(ptr); }
 119         }
 120 }"""
 121
 122         self.txout_defn = """public class TxOut : CommonBase {
 123         /** The script_pubkey in this output */
 124         public readonly byte[] script_pubkey;
 125         /** The value, in satoshis, of this output */
 126         public readonly long value;
 127
 128     internal TxOut(object _dummy, long ptr) : base(ptr) {
 129                 this.script_pubkey = InternalUtils.decodeUint8Array(bindings.TxOut_get_script_pubkey(ptr));
 130                 this.value = bindings.TxOut_get_value(ptr);
 131         }
 132     public TxOut(long value, byte[] script_pubkey) : this(null, bindings.TxOut_new(InternalUtils.encodeUint8Array(script_pubkey), value)) {}
 133
 134         ~TxOut() {
 135                 if (ptr != 0) { bindings.TxOut_free(ptr); }
 136         }
 137 }"""
 138
 139         self.scalar_defn = """public class BigEndianScalar : CommonBase {
 140         /** The bytes of the scalar value, in big endian */
 141         public readonly byte[] scalar_bytes;
 142
 143     internal BigEndianScalar(object _dummy, long ptr) : base(ptr) {
 144                 this.scalar_bytes = InternalUtils.decodeUint8Array(bindings.BigEndianScalar_get_bytes(ptr));
 145         }
 146     public BigEndianScalar(byte[] scalar_bytes) : base(bindings.BigEndianScalar_new(InternalUtils.encodeUint8Array(scalar_bytes))) {
 147                 this.scalar_bytes = InternalUtils.decodeUint8Array(bindings.BigEndianScalar_get_bytes(ptr));
 148         }
 149
 150         ~BigEndianScalar() {
 151                 if (ptr != 0) { bindings.BigEndianScalar_free(ptr); }
 152         }
 153 }"""
 154
 155         self.witness_program_defn = """public class WitnessProgram : CommonBase {
 156         /** The witness program bytes themselves */
 157         public readonly byte[] program;
 158         /** The witness version */
 159         public readonly WitnessVersion version;
 160
 161         internal WitnessProgram(object _dummy, long ptr) : base(ptr) {
 162                 this.program = InternalUtils.decodeUint8Array(bindings.WitnessProgram_get_program(ptr));
 163                 this.version = new WitnessVersion(bindings.WitnessProgram_get_version(ptr));
 164         }
 165         static private long check_args(byte[] program, WitnessVersion version) {
 166                 if (program.Length < 2 || program.Length > 40) throw new ArgumentException();
 167                 if (version.getVal() == 0 && program.Length != 20 && program.Length != 32) throw new ArgumentException();
 168                 return InternalUtils.encodeUint8Array(program);
 169         }
 170         public WitnessProgram(byte[] program, WitnessVersion version) :
 171                 this(null, bindings.WitnessProgram_new(version.getVal(), check_args(program, version))) {}
 172
 173         ~WitnessProgram() {
 174                 if (ptr != 0) { bindings.WitnessProgram_free(ptr); }
 175         }
 176 }"""
 177
 178         self.c_file_pfx = """
 179 // On OSX jlong (ie long long) is not equivalent to int64_t, so we override here
 180 #define int64_t jlong
 181 #include <lightning.h>
 182 #include <string.h>
 183 #include <stdatomic.h>
 184 #include <stdlib.h>
 185
 186 #define LIKELY(v) __builtin_expect(!!(v), 1)
 187 #define UNLIKELY(v) __builtin_expect(!!(v), 0)
 188
 189 """
 190
 191         self.c_file_pfx = self.c_file_pfx + "#include <stdio.h>\n#define DEBUG_PRINT(...) fprintf(stderr, __VA_ARGS__)\n"
 192
 193         if self.target == Target.WINDOWS:
 194             self.c_file_pfx = self.c_file_pfx + """#include <heapapi.h>
 195 static HANDLE process_heap = NULL;
 196 static inline void* init_heap() {
 197         if (UNLIKELY(process_heap == NULL)) {
 198                 // Assume pointer writes wont tear, which is true where we need it.
 199                 process_heap = GetProcessHeap();
 200         }
 201 }
 202 static inline void* MALLOC(size_t a, const char* _) {
 203         init_heap();
 204         return HeapAlloc(process_heap, HEAP_ZERO_MEMORY, a);
 205 }
 206 #define do_MALLOC(a, b, _c) MALLOC(a, b)
 207 #define FREE(p) if ((uint64_t)(p) > 4096) { init_heap(); HeapFree(process_heap, 0, p); }
 208 #define CHECK_ACCESS(p)
 209 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v)
 210 """
 211         elif not DEBUG or self.target != Target.LINUX:
 212             self.c_file_pfx = self.c_file_pfx + """#define do_MALLOC(a, _b, _c) malloc(a)
 213 #define MALLOC(a, _) malloc(a)
 214 #define FREE(p) if ((uint64_t)(p) > 4096) { free(p); }
 215 #define CHECK_ACCESS(p)
 216 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v)
 217 """
 218         if not DEBUG:
 219             self.c_file_pfx += """#define DO_ASSERT(a) (void)(a)
 220 #define CHECK(a)
 221 """
 222         if DEBUG:
 223             self.c_file_pfx = self.c_file_pfx + """#include <assert.h>
 224 // Always run a, then assert it is true:
 225 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 226 // Assert a is true or do nothing
 227 #define CHECK(a) DO_ASSERT(a)
 228
 229 void __attribute__((constructor)) debug_log_version() {
 230         if (check_get_ldk_version() == NULL)
 231                 DEBUG_PRINT("LDK version did not match the header we built against\\n");
 232         if (check_get_ldk_bindings_version() == NULL)
 233                 DEBUG_PRINT("LDK C Bindings version did not match the header we built against\\n");
 234 }
 235 """
 236
 237             if self.target == Target.LINUX:
 238                 self.c_file_pfx += """
 239 // Running a leak check across all the allocations and frees of the JDK is a mess,
 240 // so instead we implement our own naive leak checker here, relying on the -wrap
 241 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 242 // and free'd in Rust or C across the generated bindings shared library.
 243 #include <threads.h>
 244 """
 245
 246                 self.c_file_pfx = self.c_file_pfx + "#include <execinfo.h>\n"
 247                 self.c_file_pfx = self.c_file_pfx + """
 248 #include <unistd.h>
 249 #include <pthread.h>
 250 static pthread_mutex_t allocation_mtx;
 251
 252 void __attribute__((constructor)) init_mtx() {
 253         DO_ASSERT(!pthread_mutex_init(&allocation_mtx, NULL));
 254 }
 255
 256 #define BT_MAX 128
 257 typedef struct allocation {
 258         struct allocation* next;
 259         void* ptr;
 260         const char* struct_name;
 261         void* bt[BT_MAX];
 262         int bt_len;
 263         unsigned long alloc_len;
 264 } allocation;
 265 static allocation* allocation_ll = NULL;
 266
 267 void* __real_malloc(size_t len);
 268 void* __real_calloc(size_t nmemb, size_t len);
 269 static void new_allocation(void* res, const char* struct_name, size_t len) {
 270         allocation* new_alloc = __real_malloc(sizeof(allocation));
 271         new_alloc->ptr = res;
 272         new_alloc->struct_name = struct_name;
 273         new_alloc->bt_len = backtrace(new_alloc->bt, BT_MAX);
 274         new_alloc->alloc_len = len;
 275         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 276         new_alloc->next = allocation_ll;
 277         allocation_ll = new_alloc;
 278         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 279 }
 280 static void* do_MALLOC(size_t len, const char* struct_name, int lineno) {
 281         void* res = __real_malloc(len);
 282         new_allocation(res, struct_name, lineno);
 283         return res;
 284 }
 285 #define MALLOC(len, struct_name) do_MALLOC(len, struct_name, __LINE__)
 286
 287 void __real_free(void* ptr);
 288 static void alloc_freed(void* ptr) {
 289         allocation* p = NULL;
 290         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 291         allocation* it = allocation_ll;
 292         while (it->ptr != ptr) {
 293                 p = it; it = it->next;
 294                 if (it == NULL) {
 295                         DEBUG_PRINT("ERROR: Tried to free unknown pointer %p at:\\n", ptr);
 296                         void* bt[BT_MAX];
 297                         int bt_len = backtrace(bt, BT_MAX);
 298                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 299                         DEBUG_PRINT("\\n\\n");
 300                         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 301                         return; // addrsan should catch malloc-unknown and print more info than we have
 302                 }
 303         }
 304         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 305         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 306         DO_ASSERT(it->ptr == ptr);
 307         __real_free(it);
 308 }
 309 static void FREE(void* ptr) {
 310         if ((uint64_t)ptr <= 4096) return; // Rust loves to create pointers to the NULL page for dummys
 311         alloc_freed(ptr);
 312         __real_free(ptr);
 313 }
 314
 315 void* __wrap_malloc(size_t len) {
 316         void* res = __real_malloc(len);
 317         new_allocation(res, "malloc call", len);
 318         return res;
 319 }
 320 void* __wrap_calloc(size_t nmemb, size_t len) {
 321         void* res = __real_calloc(nmemb, len);
 322         new_allocation(res, "calloc call", len);
 323         return res;
 324 }
 325 void __wrap_free(void* ptr) {
 326         if (ptr == NULL) return;
 327         alloc_freed(ptr);
 328         __real_free(ptr);
 329 }
 330
 331 static void CHECK_ACCESS(const void* ptr) {
 332         DO_ASSERT(!pthread_mutex_lock(&allocation_mtx));
 333         allocation* it = allocation_ll;
 334         while (it->ptr != ptr) {
 335                 it = it->next;
 336                 if (it == NULL) {
 337                         DEBUG_PRINT("ERROR: Tried to access unknown pointer %p at:\\n", ptr);
 338                         void* bt[BT_MAX];
 339                         int bt_len = backtrace(bt, BT_MAX);
 340                         backtrace_symbols_fd(bt, bt_len, STDERR_FILENO);
 341                         DEBUG_PRINT("\\n\\n");
 342                         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 343                         return; // addrsan should catch and print more info than we have
 344                 }
 345         }
 346         DO_ASSERT(!pthread_mutex_unlock(&allocation_mtx));
 347 }
 348 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v) \\
 349         if (v.is_owned && v.inner != NULL) { \\
 350                 const void *p = __unmangle_inner_ptr(v.inner); \\
 351                 if (p != NULL) { \\
 352                         CHECK_ACCESS(p); \\
 353                 } \\
 354         }
 355
 356 void* __real_realloc(void* ptr, size_t newlen);
 357 void* __wrap_realloc(void* ptr, size_t len) {
 358         if (ptr != NULL) alloc_freed(ptr);
 359         void* res = __real_realloc(ptr, len);
 360         new_allocation(res, "realloc call", len);
 361         return res;
 362 }
 363 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 364         // Rust doesn't seem to use reallocarray currently
 365         DO_ASSERT(false);
 366 }
 367
 368 void __attribute__((destructor)) check_leaks() {
 369         unsigned long alloc_count = 0;
 370         unsigned long alloc_size = 0;
 371         DEBUG_PRINT("The following LDK-allocated blocks still remain.\\n");
 372         DEBUG_PRINT("Note that this is only accurate if System.GC.Collect(); GC.WaitForPendingFinalizers();\\n");
 373         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 374         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 375                 DEBUG_PRINT("%s %p (%lu bytes) remains:\\n", a->struct_name, a->ptr, a->alloc_len);
 376                 backtrace_symbols_fd(a->bt, a->bt_len, STDERR_FILENO);
 377                 DEBUG_PRINT("\\n\\n");
 378                 alloc_count++;
 379                 alloc_size += a->alloc_len;
 380         }
 381         DEBUG_PRINT("%lu allocations remained for %lu bytes.\\n", alloc_count, alloc_size);
 382         DEBUG_PRINT("Note that this is only accurate if System.GC.Collect(); GC.WaitForPendingFinalizers()\\n");
 383         DEBUG_PRINT("was called prior to exit after all LDK objects were out of scope.\\n");
 384 }
 385 """
 386         self.c_file_pfx = self.c_file_pfx + """
 387
 388 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 389 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 390 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 391 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 392
 393 _Static_assert(sizeof(void*) <= 8, "Pointers must fit into 64 bits");
 394
 395 // Int types across Windows/Linux are different, so make sure we're using the right headers.
 396 _Static_assert(sizeof(void*) == sizeof(uintptr_t), "stdints must be correct");
 397 _Static_assert(sizeof(void*) == sizeof(intptr_t), "stdints must be correct");
 398 _Static_assert(sizeof(uint64_t) == 8, "stdints must be correct");
 399 _Static_assert(sizeof(int64_t) == 8, "stdints must be correct");
 400 _Static_assert(sizeof(uint32_t) == 4, "stdints must be correct");
 401 _Static_assert(sizeof(int32_t) == 4, "stdints must be correct");
 402 _Static_assert(sizeof(uint16_t) == 2, "stdints must be correct");
 403 _Static_assert(sizeof(int16_t) == 2, "stdints must be correct");
 404 _Static_assert(sizeof(uint8_t) == 1, "stdints must be correct");
 405 _Static_assert(sizeof(int8_t) == 1, "stdints must be correct");
 406
 407 #define DECL_ARR_TYPE(ty, name) \\
 408         struct name##array { \\
 409                 uint64_t arr_len; /* uint32_t would suffice but we want to align uint64_ts as well */ \\
 410                 ty elems[]; \\
 411         }; \\
 412         typedef struct name##array * name##Array; \\
 413         static inline name##Array init_##name##Array(size_t arr_len, int lineno) { \\
 414                 name##Array arr = (name##Array)do_MALLOC(arr_len * sizeof(ty) + sizeof(uint64_t), #name" array init", lineno); \\
 415                 arr->arr_len = arr_len; \\
 416                 return arr; \\
 417         }
 418
 419 DECL_ARR_TYPE(int64_t, int64_t);
 420 DECL_ARR_TYPE(uint64_t, uint64_t);
 421 DECL_ARR_TYPE(int8_t, int8_t);
 422 DECL_ARR_TYPE(int16_t, int16_t);
 423 DECL_ARR_TYPE(uint32_t, uint32_t);
 424 DECL_ARR_TYPE(void*, ptr);
 425 DECL_ARR_TYPE(char, char);
 426 typedef charArray jstring;
 427
 428 static inline jstring str_ref_to_cs(const char* chars, size_t len) {
 429         charArray arr = init_charArray(len, __LINE__);
 430         memcpy(arr->elems, chars, len);
 431         return arr;
 432 }
 433 static inline LDKStr str_ref_to_owned_c(const jstring str) {
 434         char* newchars = MALLOC(str->arr_len + 1, "String chars");
 435         memcpy(newchars, str->elems, str->arr_len);
 436         newchars[str->arr_len] = 0;
 437         LDKStr res = {
 438                 .chars = newchars,
 439                 .len = str->arr_len,
 440                 .chars_is_owned = true
 441         };
 442         return res;
 443 }
 444
 445 // The C# Bool marshalling is defined as 4 bytes, but the size of bool is platform-dependent
 446 typedef int32_t jboolean;
 447
 448 int64_t CS_LDK_allocate_buffer(int64_t len) {
 449         return (int64_t)MALLOC(len, "C#-requested buffer");
 450 }
 451
 452 void CS_LDK_free_buffer(int64_t buf) {
 453         FREE((void*)buf);
 454 }
 455
 456 jstring CS_LDK_get_ldk_c_bindings_version() {
 457         return str_ref_to_cs(check_get_ldk_bindings_version(), strlen(check_get_ldk_bindings_version()));
 458 }
 459 jstring CS_LDK_get_ldk_version() {
 460         return str_ref_to_cs(check_get_ldk_version(), strlen(check_get_ldk_version()));
 461 }
 462 #include "version.c"
 463 """
 464         self.c_version_file = """const char* CS_LDK_get_lib_version_string() {
 465         return "<git_version_ldk_garbagecollected>";
 466 }"""
 467
 468         self.hu_struct_file_prefix = """using org.ldk.impl;
 469 using org.ldk.enums;
 470 using org.ldk.util;
 471 using System;
 472
 473 namespace org { namespace ldk { namespace structs {
 474
 475 """
 476         self.hu_struct_file_suffix = "} } }\n"
 477         self.c_fn_args_pfx = ""
 478         self.c_fn_ty_pfx = ""
 479         self.file_ext = ".cs"
 480         self.ptr_c_ty = "int64_t"
 481         self.ptr_native_ty = "long"
 482         self.u128_native_ty = "UInt128"
 483         self.usize_c_ty = "int64_t"
 484         self.usize_native_ty = "long"
 485         self.native_zero_ptr = "0"
 486         self.unitary_enum_c_ty = "int32_t"
 487         self.ptr_arr = "ptrArray"
 488         self.is_arr_some_check = ("", " != NULL")
 489         self.get_native_arr_len_call = ("", "->arr_len")
 490
 491         self.bindings_footer_wip = "\tstatic bindings() {\n"
 492     def bindings_footer(self):
 493         return ""
 494
 495     def native_meth_decl(self, meth_name, ret_ty_str):
 496         return "\t[DllImport (\"ldkcsharp\", EntryPoint=\"CS_LDK_" + meth_name + "\")] public static extern " + ret_ty_str + " " + meth_name
 497
 498     def c_fn_name_define_pfx(self, fn_name, have_args):
 499         return " CS_LDK_" + fn_name + "("
 500
 501     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 502         return None
 503     def create_native_arr_call(self, arr_len, ty_info):
 504         if ty_info.c_ty == "ptrArray":
 505             assert ty_info.rust_obj == "LDKCVec_U5Z" or (ty_info.subty is not None and (ty_info.subty.c_ty.endswith("Array") or ty_info.subty.rust_obj == "LDKStr"))
 506         return "init_" + ty_info.c_ty + "(" + arr_len + ", __LINE__)"
 507     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 508         if ty_info.c_ty == "int8_tArray":
 509             return ("memcpy(" + arr_name + "->elems, ", ", " + arr_len + ")")
 510         elif ty_info.c_ty == "int16_tArray":
 511             return ("memcpy(" + arr_name + "->elems, ", ", " + arr_len + " * 2)")
 512         else:
 513             assert False
 514     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 515         if ty_info.c_ty == "int8_tArray" or ty_info.c_ty == "int16_tArray":
 516             if copy:
 517                 byte_len = arr_len
 518                 if ty_info.c_ty == "int16_tArray":
 519                     byte_len = arr_len + " * 2"
 520                 return "memcpy(" + dest_name + ", " + arr_name + "->elems, " + byte_len + "); FREE(" + arr_name + ")"
 521         assert not copy
 522         if ty_info.c_ty == "ptrArray":
 523             return "(void*) " + arr_name + "->elems"
 524         else:
 525             return arr_name + "->elems"
 526     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 527         assert False # Only called if above is None
 528     def get_native_arr_ptr_call(self, ty_info):
 529         if ty_info.subty is not None:
 530             return "(" + ty_info.subty.c_ty + "*)(((uint8_t*)", ") + 8)"
 531         return "(" + ty_info.c_ty + "*)(((uint8_t*)", ") + 8)"
 532     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 533         return None
 534     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 535         if ty_info.c_ty == "int8_tArray":
 536             return "FREE(" + arr_name + ");"
 537         else:
 538             return "FREE(" + arr_name + ")"
 539
 540     def map_hu_array_elems(self, arr_name, conv_name, arr_ty, elem_ty, is_nullable):
 541         if elem_ty.java_hu_ty == "UInt5":
 542             return "InternalUtils.convUInt5Array(" + arr_name + ")"
 543         elif elem_ty.java_hu_ty == "WitnessVersion":
 544             return "InternalUtils.convWitnessVersionArray(" + arr_name + ")"
 545         else:
 546             return "InternalUtils.mapArray(" + arr_name + ", " + conv_name + " => " + elem_ty.from_hu_conv[0] + ")"
 547
 548     def str_ref_to_native_call(self, var_name, str_len):
 549         return "str_ref_to_cs(" + var_name + ", " + str_len + ")"
 550     def str_ref_to_c_call(self, var_name):
 551         return "str_ref_to_owned_c(" + var_name + ")"
 552     def str_to_hu_conv(self, var_name):
 553         return "string " + var_name + "_conv = InternalUtils.decodeString(" + var_name + ");"
 554     def str_from_hu_conv(self, var_name):
 555         return ("InternalUtils.encodeString(" + var_name + ")", "")
 556
 557     def init_str(self):
 558         ret = ""
 559         for fn_suffix in self.function_ptrs:
 560             cret = self.function_ptrs[fn_suffix]["ret"][1]
 561             cargs = self.function_ptrs[fn_suffix]["args"][1]
 562             ret += f"""
 563 typedef {cret} (*invoker_{fn_suffix})(int obj_ptr, int fn_id{cargs});
 564 static invoker_{fn_suffix} js_invoke_function_{fn_suffix};
 565 int CS_LDK_register_{fn_suffix}_invoker(invoker_{fn_suffix} invoker) {{
 566         js_invoke_function_{fn_suffix} = invoker;
 567         return 0;
 568 }}
 569 """
 570
 571         return ret
 572
 573     def var_decl_statement(self, ty_string, var_name, statement):
 574         return ty_string + " " + var_name + " = " + statement
 575
 576     def get_java_arr_len(self, arr_name):
 577         return "InternalUtils.getArrayLength(" + arr_name + ")"
 578
 579     def get_java_arr_elem(self, elem_ty, arr_name, idx):
 580         if elem_ty.c_ty == "int64_t" or elem_ty.c_ty == "uint64_t":
 581             return "InternalUtils.getU64ArrayElem(" + arr_name + ", " + idx + ")"
 582         elif elem_ty.c_ty.endswith("Array") or elem_ty.c_ty == "uintptr_t" or elem_ty.rust_obj == "LDKStr":
 583             return "InternalUtils.getU64ArrayElem(" + arr_name + ", " + idx + ")"
 584         elif elem_ty.rust_obj == "LDKU5":
 585             return "InternalUtils.getU8ArrayElem(" + arr_name + ", " + idx + ")"
 586         else:
 587             assert False
 588
 589     def constr_hu_array(self, ty_info, arr_len):
 590         base_ty = ty_info.subty.java_hu_ty.split("[")[0].split("<")[0]
 591         conv = "new " + base_ty + "[" + arr_len + "]"
 592         if "[" in ty_info.subty.java_hu_ty.split("<")[0]:
 593             # Do a bit of a dance to move any excess [] to the end
 594             conv += "[" + ty_info.subty.java_hu_ty.split("<")[0].split("[")[1]
 595         return conv
 596     def cleanup_converted_native_array(self, ty_info, arr_name):
 597         return "bindings.free_buffer(" + arr_name + ");"
 598
 599     def primitive_arr_from_hu(self, arr_ty, fixed_len, arr_name):
 600         mapped_ty = arr_ty.subty
 601         inner = arr_name
 602         if arr_ty.rust_obj == "LDKU128":
 603             return ("InternalUtils.encodeUint8Array(" + arr_name + ".getLEBytes())", "")
 604         if fixed_len is not None:
 605             inner = "InternalUtils.check_arr_len(" + arr_name + ", " + fixed_len + ")"
 606         if mapped_ty.c_ty.endswith("Array"):
 607             return ("InternalUtils.encodeUint64Array(" + inner + ")", "")
 608         elif mapped_ty.c_ty == "uint8_t" or mapped_ty.c_ty == "int8_t":
 609             return ("InternalUtils.encodeUint8Array(" + inner + ")", "")
 610         elif mapped_ty.c_ty == "uint16_t" or mapped_ty.c_ty == "int16_t":
 611             return ("InternalUtils.encodeUint16Array(" + inner + ")", "")
 612         elif mapped_ty.c_ty == "uint32_t":
 613             return ("InternalUtils.encodeUint32Array(" + inner + ")", "")
 614         elif mapped_ty.c_ty == "int64_t" or mapped_ty.c_ty == "uint64_t" or mapped_ty.rust_obj == "LDKStr":
 615             return ("InternalUtils.encodeUint64Array(" + inner + ")", "")
 616         else:
 617             print(mapped_ty.c_ty)
 618             assert False
 619
 620     def primitive_arr_to_hu(self, arr_ty, fixed_len, arr_name, conv_name):
 621         mapped_ty = arr_ty.subty
 622         if arr_ty.rust_obj == "LDKU128":
 623             return "org.ldk.util.UInt128 " + conv_name + " = new org.ldk.util.UInt128(" + arr_name + ");"
 624         elif mapped_ty.c_ty == "uint8_t" or mapped_ty.c_ty == "int8_t":
 625             return "byte[] " + conv_name + " = InternalUtils.decodeUint8Array(" + arr_name + ");"
 626         elif mapped_ty.c_ty == "uint16_t" or mapped_ty.c_ty == "int16_t":
 627             return "short[] " + conv_name + " = InternalUtils.decodeUint16Array(" + arr_name + ");"
 628         elif mapped_ty.c_ty == "uint64_t" or mapped_ty.c_ty == "int64_t":
 629             return "long[] " + conv_name + " = InternalUtils.decodeUint64Array(" + arr_name + ");"
 630         else:
 631             assert False
 632
 633     def java_arr_ty_str(self, elem_ty_str):
 634         return "long"
 635
 636     def for_n_in_range(self, n, minimum, maximum):
 637         return "for (int " + n + " = " + minimum + "; " + n + " < " + maximum + "; " + n + "++) {"
 638     def for_n_in_arr(self, n, arr_name, arr_elem_ty):
 639         return ("foreach (" + arr_elem_ty.java_hu_ty + " " + n + " in " + arr_name + ") { ", " }")
 640
 641     def get_ptr(self, var):
 642         return var + ".ptr"
 643     def set_null_skip_free(self, var):
 644         return var + ".ptr" + " = 0;"
 645
 646     def add_ref(self, holder, referent):
 647         return "if (" + holder + " != null) { " + holder + ".ptrs_to.AddLast(" + referent + "); }"
 648
 649     def fully_qualified_hu_ty_path(self, ty):
 650         if ty.java_fn_ty_arg.startswith("L") and ty.java_fn_ty_arg.endswith(";"):
 651             return ty.java_hu_ty
 652         if ty.java_hu_ty == "UnqualifiedError" or ty.java_hu_ty == "UInt128" or ty.java_hu_ty == "UInt5" or ty.java_hu_ty == "WitnessVersion":
 653             return "org.ldk.util." + ty.java_hu_ty
 654         if not ty.is_native_primitive and ty.rust_obj is not None and not "[]" in ty.java_hu_ty:
 655             return "org.ldk.structs." + ty.java_hu_ty
 656         return ty.java_hu_ty
 657
 658     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 659         out_java_enum = "namespace org { namespace ldk { namespace enums {"
 660         out_java = ""
 661         out_c = ""
 662
 663         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_cs(int32_t ord) {\n"
 664         out_c += "\tswitch (ord) {\n"
 665
 666         if enum_doc_comment is not None:
 667             out_java_enum += "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
 668         out_java_enum += "public enum " + struct_name + " {\n"
 669         ord_v = 0
 670         for var, var_docs in variants:
 671             if var_docs is not None:
 672                 out_java_enum += "\t/**\n\t * " + var_docs.replace("\n", "\n\t * ") + "\n\t */\n"
 673             out_java_enum += "\t" + var + ",\n"
 674             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 675             ord_v = ord_v + 1
 676         out_java_enum += "}"
 677         out_c += "\t\tdefault: abort();\n"
 678         out_c += "\t}\n"
 679         out_c += "}\n"
 680
 681         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_cs(LDK" + struct_name + " val) {\n"
 682         out_c = out_c + "\tswitch (val) {\n"
 683         ord_v = 0
 684         for var, _ in variants:
 685             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 686             ord_v = ord_v + 1
 687         out_c = out_c + "\t\tdefault: abort();\n"
 688         out_c = out_c + "\t}\n"
 689         out_c = out_c + "}\n"
 690
 691         return (out_c, out_java_enum + "} } }\n", out_java)
 692
 693     def c_unitary_enum_to_native_call(self, ty_info):
 694         return (ty_info.rust_obj + "_to_cs(", ")")
 695     def native_unitary_enum_to_c_call(self, ty_info):
 696         return (ty_info.rust_obj + "_from_cs(", ")")
 697
 698     def c_complex_enum_pfx(self, struct_name, variants, init_meth_jty_strs):
 699         out_c = ""
 700         for var in variants:
 701             out_c = out_c + "static jclass " + struct_name + "_" + var + "_class = NULL;\n"
 702             out_c = out_c + "static jmethodID " + struct_name + "_" + var + "_meth = NULL;\n"
 703         out_c += "void" + self.c_fn_name_define_pfx(struct_name.replace("_", "_1") + "_init", True) + self.c_fn_args_pfx + ") {\n"
 704         for var_name in variants:
 705             out_c += "\t" + struct_name + "_" + var_name + "_class =\n"
 706             out_c += "\t\t(*env)->NewGlobalRef(env, (*env)->FindClass(env, \"org/ldk/impl/bindings$" + struct_name + "$" + var_name + "\"));\n"
 707             out_c += "\tCHECK(" + struct_name + "_" + var_name + "_class != NULL);\n"
 708             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"
 709             out_c += "\tCHECK(" + struct_name + "_" + var_name + "_meth != NULL);\n"
 710         out_c = out_c + "}\n"
 711         return out_c
 712
 713     def c_complex_enum_pass_ty(self, struct_name):
 714         return "jobject"
 715
 716     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 717         ret = "(*env)->NewObject(env, " + struct_name + "_" + variant + "_class, " + struct_name + "_" + variant + "_meth"
 718         for param in c_params:
 719             ret = ret + ", " + param
 720         return ret + ")"
 721
 722     def native_c_map_trait(self, struct_name, field_var_conversions, flattened_field_var_conversions, field_function_lines, trait_doc_comment):
 723         out_typescript_bindings = ""
 724         super_instantiator = ""
 725         bindings_instantiator = ""
 726         pointer_to_adder = ""
 727         impl_constructor_arguments = ""
 728         for var in flattened_field_var_conversions:
 729             if isinstance(var, ConvInfo):
 730                 impl_constructor_arguments += f", {var.java_hu_ty} {var.arg_name}"
 731                 if var.from_hu_conv is not None:
 732                     bindings_instantiator += ", " + var.from_hu_conv[0]
 733                     if var.from_hu_conv[1] != "":
 734                         pointer_to_adder += "\t\t\t" + var.from_hu_conv[1] + ";\n"
 735                 else:
 736                     bindings_instantiator += ", " + first_to_lower(var.arg_name)
 737             else:
 738                 bindings_instantiator += ", " + first_to_lower(var[1]) + ".instance_idx"
 739                 pointer_to_adder += "\t\timpl_holder.held.ptrs_to.AddLast(" + first_to_lower(var[1]) + ");\n"
 740                 impl_constructor_arguments += f", {var[0].replace('LDK', '')}Interface {first_to_lower(var[1])}_impl"
 741
 742         super_constructor_statements = ""
 743         trait_constructor_arguments = ""
 744         for var in field_var_conversions:
 745             if isinstance(var, ConvInfo):
 746                 trait_constructor_arguments += ", " + var.arg_name
 747             else:
 748                 super_constructor_statements += "\t\t" + var[1] + " " + first_to_lower(var[1]) + " = " + var[1] + ".new_impl(" + first_to_lower(var[1]) + "_impl"
 749                 super_instantiator = ""
 750                 for suparg in var[2]:
 751                     if isinstance(suparg, ConvInfo):
 752                         super_instantiator += ", " + suparg.arg_name
 753                     else:
 754                         super_instantiator += ", " + first_to_lower(suparg[1]) + "_impl"
 755                 super_constructor_statements += super_instantiator + ");\n"
 756                 trait_constructor_arguments += ", " + first_to_lower(var[1]) + ".instance_idx"
 757                 for suparg in var[2]:
 758                     if isinstance(suparg, ConvInfo):
 759                         trait_constructor_arguments += ", " + suparg.arg_name
 760                     else:
 761                         # Blindly assume that we can just strip the first arg to build the args for the supertrait
 762                         super_constructor_statements += "\t\t" + suparg[1] + " " + first_to_lower(suparg[1]) + " = " + suparg[1] + ".new_impl(" + super_instantiator.split(", ", 1)[1] + ");\n"
 763                         trait_constructor_arguments += ", " + suparg[1]
 764
 765         # BUILD INTERFACE METHODS
 766
 767         java_trait_wrapper = "\tprivate class " + struct_name + "Holder { internal " + struct_name.replace("LDK", "") + " held; }\n"
 768         java_trait_wrapper += "\tprivate class " + struct_name + "Impl : bindings." + struct_name + " {\n"
 769         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"
 770         java_trait_wrapper += "\t\tprivate " + struct_name.replace("LDK", "") + "Interface arg;\n"
 771         java_trait_wrapper += "\t\tprivate " + struct_name + "Holder impl_holder;\n"
 772
 773         for fn_line in field_function_lines:
 774             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 775                 fn_name = fn_line.fn_name
 776                 if fn_name == "lock": # reserved symbol
 777                     fn_name = "do_lock"
 778                 java_trait_wrapper += "\t\tpublic " + fn_line.ret_ty_info.java_ty + " " + fn_name + "("
 779
 780                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 781                     if idx >= 1:
 782                         java_trait_wrapper += ", "
 783                     java_trait_wrapper += arg_conv_info.java_ty + " _" + arg_conv_info.arg_name
 784
 785                 java_trait_wrapper += ") {\n"
 786
 787                 for arg_info in fn_line.args_ty:
 788                     if arg_info.to_hu_conv is not None:
 789                         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"
 790
 791                 if fn_line.ret_ty_info.java_ty != "void":
 792                     java_trait_wrapper += "\t\t\t" + fn_line.ret_ty_info.java_hu_ty + " ret = arg." + fn_name + "("
 793                 else:
 794                     java_trait_wrapper += "\t\t\targ." + fn_name + "("
 795
 796                 for idx, arg_info in enumerate(fn_line.args_ty):
 797                     if idx != 0:
 798                         java_trait_wrapper += ", "
 799                     if arg_info.to_hu_conv_name is not None:
 800                         java_trait_wrapper += arg_info.to_hu_conv_name.replace(arg_info.arg_name, "_" + arg_info.arg_name)
 801                     else:
 802                         java_trait_wrapper += "_" + arg_info.arg_name
 803
 804                 java_trait_wrapper += ");\n"
 805                 java_trait_wrapper += "\t\t\t\tGC.KeepAlive(arg);\n"
 806                 if fn_line.ret_ty_info.java_ty != "void":
 807                     if fn_line.ret_ty_info.from_hu_conv is not None:
 808                         java_trait_wrapper += "\t\t\t" + fn_line.ret_ty_info.java_ty + " result = " + fn_line.ret_ty_info.from_hu_conv[0] + ";\n"
 809                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 810                             java_trait_wrapper += "\t\t\t" + fn_line.ret_ty_info.from_hu_conv[1].replace("this", "impl_holder.held") + ";\n"
 811                         java_trait_wrapper += "\t\t\treturn result;\n"
 812                     else:
 813                         java_trait_wrapper += "\t\t\treturn ret;\n"
 814                 java_trait_wrapper += "\t\t}\n"
 815         java_trait_wrapper += "\t}"
 816
 817         out_java_interface = ""
 818         java_methods = []
 819         for fn_line in field_function_lines:
 820             java_method_descriptor = ""
 821             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 822                 out_java_interface += "\t/**" + fn_line.docs.replace("\n", "\n\t * ") + "\n\t */\n"
 823                 out_java_interface += "\t" + fn_line.ret_ty_info.java_hu_ty + " " + fn_line.fn_name + "("
 824
 825                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 826                     if idx >= 1:
 827                         out_java_interface += ", "
 828                     out_java_interface += f"{arg_conv_info.java_hu_ty} {safe_arg_name(arg_conv_info.arg_name)}"
 829                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 830                 out_java_interface += f");\n"
 831                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 832                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 833
 834         formatted_trait_docs = trait_doc_comment.replace("\n", "\n * ")
 835         out_typescript_human = f"""
 836 {self.hu_struct_file_prefix}
 837
 838 /** An implementation of {struct_name.replace("LDK","")} */
 839 public interface {struct_name.replace("LDK", "")}Interface {{
 840 {out_java_interface}}}
 841
 842 /**
 843  * {formatted_trait_docs}
 844  */
 845 public class {struct_name.replace("LDK","")} : CommonBase {{
 846         internal bindings.{struct_name} bindings_instance;
 847         internal long instance_idx;
 848
 849         internal {struct_name.replace("LDK","")}(object _dummy, long ptr) : base(ptr) {{ bindings_instance = null; }}
 850         ~{struct_name.replace("LDK","")}() {{
 851                 if (ptr != 0) {{ bindings.{struct_name.replace("LDK","")}_free(ptr); }}
 852         }}
 853
 854 {java_trait_wrapper}
 855
 856         /** Creates a new instance of {struct_name.replace("LDK","")} from a given implementation */
 857         public static {struct_name.replace("LDK", "")} new_impl({struct_name.replace("LDK", "")}Interface arg{impl_constructor_arguments}) {{
 858                 {struct_name}Holder impl_holder = new {struct_name}Holder();
 859                 {struct_name}Impl impl = new {struct_name}Impl(arg, impl_holder);
 860 {super_constructor_statements}          long[] ptr_idx = bindings.{struct_name}_new(impl{bindings_instantiator});
 861
 862                 impl_holder.held = new {struct_name.replace("LDK", "")}(null, ptr_idx[0]);
 863                 impl_holder.held.instance_idx = ptr_idx[1];
 864                 impl_holder.held.bindings_instance = impl;
 865 {pointer_to_adder}              return impl_holder.held;
 866         }}
 867
 868 """
 869
 870         out_typescript_bindings += "\tpublic interface " + struct_name + " {\n"
 871         java_meths = []
 872         for fn_line in field_function_lines:
 873             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 874                 out_typescript_bindings += f"\t\t{fn_line.ret_ty_info.java_ty} {fn_line.fn_name}("
 875
 876                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 877                     if idx >= 1:
 878                         out_typescript_bindings = out_typescript_bindings + ", "
 879                     out_typescript_bindings += f"{arg_conv_info.java_ty} {safe_arg_name(arg_conv_info.arg_name)}"
 880
 881                 out_typescript_bindings += f");\n"
 882
 883         out_typescript_bindings += "\t}\n"
 884
 885         c_call_extra_args = ""
 886         native_fn_args = "long impl_idx"
 887         for var in flattened_field_var_conversions:
 888             if isinstance(var, ConvInfo):
 889                 native_fn_args += ", " + var.java_ty + " " + var.arg_name
 890             else:
 891                 native_fn_args += ", long " + var[1]
 892         out_typescript_bindings += self.native_meth_decl(struct_name + "_new", "long") + "_native(" + native_fn_args + ");\n"
 893         out_typescript_bindings += f"\tpublic static long[] {struct_name}_new({struct_name} impl"
 894         for var in flattened_field_var_conversions:
 895             if isinstance(var, ConvInfo):
 896                 out_typescript_bindings += f", {var.java_ty} {var.arg_name}"
 897                 c_call_extra_args += f", {var.arg_name}"
 898             else:
 899                 out_typescript_bindings += f", long {var[1]}"
 900                 c_call_extra_args += f", {var[1]}"
 901
 902
 903         out_typescript_bindings += f""") {{
 904                 long new_obj_idx = js_objs.Count;
 905                 int i = 0;
 906                 for (; i < js_objs.Count; i++) {{
 907                         if (js_objs[i] == null || !js_objs[i].IsAlive) {{ new_obj_idx = i; break; }}
 908                 }}
 909                 if (i == js_objs.Count) {{
 910                         js_objs.Add(new WeakReference(impl));
 911                 }} else {{
 912                         js_objs[i] = new WeakReference(impl);
 913                 }}
 914                 long[] ret = new long[2];
 915                 ret[0] = {struct_name}_new_native(i{c_call_extra_args});
 916                 ret[1] = i;
 917                 return ret;
 918         }}
 919 """
 920
 921         # Now that we've written out our java code (and created java_meths), generate C
 922         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 923         out_c += "\tatomic_size_t refcnt;\n"
 924         out_c += "\tuint32_t instance_ptr;\n"
 925         for var in flattened_field_var_conversions:
 926             if isinstance(var, ConvInfo):
 927                 # We're a regular ol' field
 928                 pass
 929             else:
 930                 # We're a supertrait
 931                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 932         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 933
 934         for fn_line in field_function_lines:
 935             if fn_line.fn_name == "free":
 936                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 937                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 938                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 939                 out_c = out_c + "\t\tFREE(j_calls);\n"
 940                 out_c = out_c + "\t}\n}\n"
 941
 942         for idx, fn_line in enumerate(field_function_lines):
 943             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 944                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 945                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 946                 if fn_line.self_is_const:
 947                     out_c = out_c + "const void* this_arg"
 948                 else:
 949                     out_c = out_c + "void* this_arg"
 950
 951                 for idx, arg in enumerate(fn_line.args_ty):
 952                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 953
 954                 out_c = out_c + ") {\n"
 955                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 956
 957                 for arg_info in fn_line.args_ty:
 958                     if arg_info.ret_conv is not None:
 959                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 960                         out_c = out_c + arg_info.arg_name
 961                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 962
 963                 ty_to_c = lambda jty, ty: "b" if jty == "bool" else "c" if jty == "char" else "s" if jty == "short" else "i" if jty == "int" else "l" if jty == "long" else "void" if jty == "void" else jty
 964
 965                 fn_java_callback_args = ""
 966                 fn_c_callback_args = ""
 967                 fn_callback_call_args = ""
 968                 fn_suffix = ty_to_c(fn_line.ret_ty_info.java_ty, fn_line.ret_ty_info) + "_"
 969                 idx = 0
 970                 for arg_info in fn_line.args_ty:
 971                     fn_suffix += ty_to_c(arg_info.java_ty, arg_info)
 972                     fn_java_callback_args += ", " + arg_info.java_ty + " " + chr(ord("a") + idx)
 973                     if arg_info.c_ty.endswith("Array") or arg_info.c_ty == "jstring":
 974                         fn_c_callback_args += ", int64_t " + chr(ord("a") + idx)
 975                     else:
 976                         fn_c_callback_args += ", " + arg_info.c_ty + " " + chr(ord("a") + idx)
 977                     if idx != 0:
 978                         fn_callback_call_args += ", "
 979                     fn_callback_call_args += chr(ord("a") + idx)
 980                     idx += 1
 981                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 982                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (" + fn_line.ret_ty_info.c_ty + ")"
 983                     out_c += "js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 984                 elif fn_line.ret_ty_info.java_ty == "void":
 985                     out_c = out_c + "\tjs_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 986                 elif fn_line.ret_ty_info.java_hu_ty == "string":
 987                     out_c += "\tjstring ret = (jstring)js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 988                 elif fn_line.ret_ty_info.arg_conv is None:
 989                     out_c += "\treturn js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 990                 else:
 991                     out_c += "\tuint64_t ret = js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 992
 993                 if fn_suffix not in self.function_ptrs:
 994                     caller_ret_c_ty = fn_line.ret_ty_info.c_ty
 995                     if fn_line.ret_ty_info.c_ty.endswith("Array") or fn_line.ret_ty_info.c_ty == "jstring":
 996                         caller_ret_c_ty = "int64_t"
 997                     self.function_ptrs[fn_suffix] = {"args": [fn_java_callback_args, fn_c_callback_args], "ret": [fn_line.ret_ty_info.java_ty, caller_ret_c_ty]}
 998                 self.function_ptrs[fn_suffix][self.function_ptr_counter] = (struct_name, fn_line.fn_name, fn_callback_call_args)
 999                 self.function_ptr_counter += 1
1000
1001                 for idx, arg_info in enumerate(fn_line.args_ty):
1002                     if arg_info.ret_conv is not None:
1003                         if arg_info.c_ty.endswith("Array") or arg_info.c_ty == "jstring":
1004                             out_c += ", (int64_t)" + arg_info.ret_conv_name
1005                         else:
1006                             out_c += ", " + arg_info.ret_conv_name
1007                     else:
1008                         assert False # TODO: Would we need some conversion here?
1009                         out_c += ", (int64_t)" + arg_info.arg_name
1010                 out_c = out_c + ");\n"
1011                 if fn_line.ret_ty_info.arg_conv is not None:
1012                     out_c = out_c + "\t" + fn_line.ret_ty_info.arg_conv.replace("\n", "\n\t") + "\n\treturn " + fn_line.ret_ty_info.arg_conv_name + ";\n"
1013
1014                 out_c = out_c + "}\n"
1015
1016         # Write out a clone function whether we need one or not, as we use them in moving to rust
1017         out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
1018         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
1019         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
1020         for var in flattened_field_var_conversions:
1021             if not isinstance(var, ConvInfo):
1022                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[2].replace(".", "->") + "->refcnt, 1, memory_order_release);\n"
1023         out_c = out_c + "}\n"
1024
1025         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (int64_t o"
1026         for var in flattened_field_var_conversions:
1027             if isinstance(var, ConvInfo):
1028                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
1029             else:
1030                 out_c = out_c + ", int64_t " + var[1]
1031         out_c = out_c + ") {\n"
1032
1033         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
1034         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
1035         out_c = out_c + "\tcalls->instance_ptr = o;\n"
1036
1037         for (fn_name, java_meth_descr) in java_meths:
1038             if fn_name != "free" and fn_name != "cloned":
1039                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
1040                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
1041
1042         for var in flattened_field_var_conversions:
1043             if isinstance(var, ConvInfo) and var.arg_conv is not None:
1044                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
1045         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
1046         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
1047         for fn_line in field_function_lines:
1048             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
1049                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
1050             elif fn_line.fn_name == "free":
1051                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
1052             else:
1053                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
1054         for var in field_var_conversions:
1055             if isinstance(var, ConvInfo):
1056                 if var.arg_conv_name is not None:
1057                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
1058                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
1059                 else:
1060                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
1061                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
1062             else:
1063                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(" + var[1]
1064                 for suparg in var[2]:
1065                     if isinstance(suparg, ConvInfo):
1066                         out_c += ", " + suparg.arg_name
1067                     else:
1068                         out_c += ", " + suparg[1]
1069                 out_c += "),\n"
1070         out_c = out_c + "\t};\n"
1071         for var in flattened_field_var_conversions:
1072             if not isinstance(var, ConvInfo):
1073                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[2] + ".this_arg;\n"
1074         out_c = out_c + "\treturn ret;\n"
1075         out_c = out_c + "}\n"
1076
1077         out_c = out_c + self.c_fn_ty_pfx + "uint64_t " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "int32_t o"
1078         for var in flattened_field_var_conversions:
1079             if isinstance(var, ConvInfo):
1080                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
1081             else:
1082                 out_c = out_c + ", int32_t " + var[1]
1083         out_c = out_c + ") {\n"
1084         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
1085         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(o"
1086         for var in flattened_field_var_conversions:
1087             if isinstance(var, ConvInfo):
1088                 out_c = out_c + ", " + var.arg_name
1089             else:
1090                 out_c = out_c + ", " + var[1]
1091         out_c = out_c + ");\n"
1092         out_c = out_c + "\treturn tag_ptr(res_ptr, true);\n"
1093         out_c = out_c + "}\n"
1094
1095         return (out_typescript_bindings, out_typescript_human, out_c)
1096
1097     def trait_struct_inc_refcnt(self, ty_info):
1098         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
1099         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
1100         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_cloned(&" + ty_info.var_name + "_conv);\n}"
1101         return base_conv
1102
1103     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
1104         bindings_type = struct_name.replace("LDK", "")
1105         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
1106
1107         out_java_enum = ""
1108         out_java = ""
1109         out_c = ""
1110
1111         out_java_enum += (self.hu_struct_file_prefix)
1112
1113         java_hu_class = "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
1114         java_hu_class += "public class " + java_hu_type + " : CommonBase {\n"
1115         java_hu_class += f"\tprotected {java_hu_type}(object _dummy, long ptr) : base(ptr)" + " { }\n"
1116         java_hu_class += "\t~" + java_hu_type + "() {\n"
1117         java_hu_class += "\t\tif (ptr != 0) { bindings." + bindings_type + "_free(ptr); }\n"
1118         java_hu_class += "\t}\n\n"
1119         java_hu_class += f"\tinternal static {java_hu_type} constr_from_ptr(long ptr) {{\n"
1120         java_hu_class += f"\t\tlong raw_ty = bindings." + struct_name + "_ty_from_ptr(ptr);\n"
1121         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"
1122         out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)untag_ptr(ptr);\n"
1123         out_c += "\tswitch(obj->tag) {\n"
1124         java_hu_class += "\t\tswitch (raw_ty) {\n"
1125         java_hu_subclasses = ""
1126
1127         var_idx = 0
1128         for var in variant_list:
1129             java_hu_subclasses += "\t/** A " + java_hu_type + " of type " + var.var_name + " */\n"
1130             java_hu_subclasses += "\tpublic class " + java_hu_type + "_" + var.var_name + " : " + java_hu_type + " {\n"
1131             java_hu_class += f"\t\t\tcase {var_idx}: "
1132             java_hu_class += "return new " + java_hu_type + "_" + var.var_name + "(ptr);\n"
1133             out_c += f"\t\tcase {struct_name}_{var.var_name}: return {var_idx};\n"
1134             hu_conv_body = ""
1135             for idx, (field_ty, field_docs) in enumerate(var.fields):
1136                 if field_docs is not None:
1137                     java_hu_subclasses += "\t\t/**\n\t\t * " + field_docs.replace("\n", "\n\t\t * ") + "\n\t\t */\n"
1138                 java_hu_subclasses += f"\t\tpublic {field_ty.java_hu_ty} {field_ty.arg_name};\n"
1139                 if field_ty.to_hu_conv is not None:
1140                     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"
1141                     hu_conv_body += f"\t\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1142                     hu_conv_body += f"\t\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1143                 else:
1144                     hu_conv_body += f"\t\t\tthis.{field_ty.arg_name} = bindings.{struct_name}_{var.var_name}_get_{field_ty.arg_name}(ptr);\n"
1145             java_hu_subclasses += "\t\tinternal " + java_hu_type + "_" + var.var_name + "(long ptr) : base(null, ptr) {\n"
1146             java_hu_subclasses += hu_conv_body
1147             java_hu_subclasses += "\t\t}\n\t}\n"
1148             var_idx += 1
1149         java_hu_class += "\t\t\tdefault:\n\t\t\t\tthrow new ArgumentException(\"Impossible enum variant\");\n\t\t}\n\t}\n\n"
1150         out_java += self.native_meth_decl(struct_name + "_ty_from_ptr", "long") + "(long ptr);\n"
1151         out_c += ("\t\tdefault: abort();\n")
1152         out_c += ("\t}\n}\n")
1153
1154         for var in variant_list:
1155             for idx, (field_map, _) in enumerate(var.fields):
1156                 fn_name = f"{struct_name}_{var.var_name}_get_{field_map.arg_name}"
1157                 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"
1158                 out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)untag_ptr(ptr);\n"
1159                 out_c += f"\tCHECK(obj->tag == {struct_name}_{var.var_name});\n"
1160                 if field_map.ret_conv is not None:
1161                     out_c += ("\t" + field_map.ret_conv[0].replace("\n", "\n\t"))
1162                     if var.tuple_variant:
1163                         out_c += "obj->" + camel_to_snake(var.var_name)
1164                     else:
1165                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
1166                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1167                     out_c += "\treturn " + field_map.ret_conv_name + ";\n"
1168                 else:
1169                     if var.tuple_variant:
1170                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + ";\n"
1171                     else:
1172                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name + ";\n"
1173                 out_c += "}\n"
1174                 out_java += self.native_meth_decl(fn_name, field_map.java_ty) + "(long ptr);\n"
1175         out_java_enum += java_hu_class
1176         out_java_enum += java_hu_subclasses
1177         return (out_java, out_java_enum, out_c)
1178
1179     def map_opaque_struct(self, struct_name, struct_doc_comment):
1180         out_opaque_struct_human = ""
1181         out_opaque_struct_human += self.hu_struct_file_prefix
1182         out_opaque_struct_human += "\n/**\n * " + struct_doc_comment.replace("\n", "\n * ") + "\n */\n"
1183         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDKC4Tuple", "FourTuple").replace("LDK", "")
1184         out_opaque_struct_human += ("public class " + hu_name + " : CommonBase")
1185         if struct_name.startswith("LDKLocked") or struct_name.startswith("LDKReadOnly"):
1186             out_opaque_struct_human += (", IDisposable")
1187         out_opaque_struct_human += (" {\n")
1188         out_opaque_struct_human += ("\tinternal " + hu_name + "(object _dummy, long ptr) : base(ptr) { }\n")
1189         if struct_name.startswith("LDKLocked") or struct_name.startswith("LDKReadOnly"):
1190             out_opaque_struct_human += ("\tpublic void Dispose() {\n")
1191         else:
1192             out_opaque_struct_human += ("\t~" + hu_name + "() {\n")
1193         out_opaque_struct_human += ("\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n")
1194         out_opaque_struct_human += ("\t}\n\n")
1195         return out_opaque_struct_human
1196
1197     def map_tuple(self, struct_name):
1198         return self.map_opaque_struct(struct_name, "A Tuple")
1199
1200     def map_result(self, struct_name, res_map, err_map):
1201         human_ty = struct_name.replace("LDKCResult", "Result")
1202         java_hu_struct = ""
1203         java_hu_struct += self.hu_struct_file_prefix
1204         java_hu_struct += "public class " + human_ty + " : CommonBase {\n"
1205         java_hu_struct += "\t" + human_ty + "(object _dummy, long ptr) : base(ptr) { }\n"
1206         java_hu_struct += "\t~" + human_ty + "() {\n"
1207         java_hu_struct += "\t\tif (ptr != 0) { bindings." + struct_name.replace("LDK","") + "_free(ptr); }\n"
1208         java_hu_struct += "\t}\n\n"
1209         java_hu_struct += "\tinternal static " + human_ty + " constr_from_ptr(long ptr) {\n"
1210         java_hu_struct += "\t\tif (bindings." + struct_name.replace("LDK", "") + "_is_ok(ptr)) {\n"
1211         java_hu_struct += "\t\t\treturn new " + human_ty + "_OK(null, ptr);\n"
1212         java_hu_struct += "\t\t} else {\n"
1213         java_hu_struct += "\t\t\treturn new " + human_ty + "_Err(null, ptr);\n"
1214         java_hu_struct += "\t\t}\n"
1215         java_hu_struct += "\t}\n"
1216
1217         java_hu_struct += "\tpublic class " + human_ty + "_OK : " + human_ty + " {\n"
1218
1219         if res_map.java_hu_ty != "void":
1220             java_hu_struct += "\t\tpublic readonly " + res_map.java_hu_ty + " res;\n"
1221         java_hu_struct += "\t\tinternal " + human_ty + "_OK(object _dummy, long ptr) : base(_dummy, ptr) {\n"
1222         if res_map.java_hu_ty == "void":
1223             pass
1224         elif res_map.to_hu_conv is not None:
1225             java_hu_struct += "\t\t\t" + res_map.java_ty + " res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1226             java_hu_struct += "\t\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t\t")
1227             java_hu_struct += "\n\t\t\tthis.res = " + res_map.to_hu_conv_name + ";\n"
1228         else:
1229             java_hu_struct += "\t\t\tthis.res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1230         java_hu_struct += "\t\t}\n"
1231         java_hu_struct += "\t}\n\n"
1232
1233         java_hu_struct += "\tpublic class " + human_ty + "_Err : " + human_ty + " {\n"
1234         if err_map.java_hu_ty != "void":
1235             java_hu_struct += "\t\tpublic readonly " + err_map.java_hu_ty + " err;\n"
1236         java_hu_struct += "\t\tinternal " + human_ty + "_Err(object _dummy, long ptr) : base(_dummy, ptr) {\n"
1237         if err_map.java_hu_ty == "void":
1238             pass
1239         elif err_map.to_hu_conv is not None:
1240             java_hu_struct += "\t\t\t" + err_map.java_ty + " err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1241             java_hu_struct += "\t\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t\t")
1242             java_hu_struct += "\n\t\t\tthis.err = " + err_map.to_hu_conv_name + ";\n"
1243         else:
1244             java_hu_struct += "\t\t\tthis.err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1245         java_hu_struct += "\t\t}\n"
1246
1247         java_hu_struct += "\t}\n\n"
1248         return java_hu_struct
1249
1250     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):
1251         out_java = ""
1252         out_c = ""
1253         out_java_struct = None
1254
1255         out_java += self.native_meth_decl(method_name, return_type_info.java_ty) + "("
1256         out_c += (return_type_info.c_ty)
1257         if return_type_info.ret_conv is not None:
1258             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1259         have_args = len(argument_types) > 1 or (len(argument_types) > 0 and argument_types[0].c_ty != "void")
1260         out_c += (" " + self.c_fn_name_define_pfx(method_name, have_args))
1261
1262         for idx, arg_conv_info in enumerate(argument_types):
1263             if idx != 0:
1264                 out_java += (", ")
1265                 out_c += (", ")
1266             if arg_conv_info.c_ty != "void":
1267                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1268                 out_java += (arg_conv_info.java_ty + " _" + arg_conv_info.arg_name) # Add a _ to avoid using reserved words
1269
1270         out_java_struct = ""
1271         extra_java_struct_out = ""
1272         if not args_known:
1273             out_java_struct += ("\t// Skipped " + method_name + "\n")
1274         else:
1275             if doc_comment is not None:
1276                 out_java_struct += "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
1277             hu_ret_ty = return_type_info.java_hu_ty
1278             if return_type_info.nullable:
1279                 #hu_ret_ty += "?" - apparently mono doesn't support the nullable stuff
1280                 pass
1281             if not takes_self:
1282                 if meth_n == "new":
1283                     out_java_struct += "\tpublic static " + hu_ret_ty + " of("
1284                 elif meth_n == "default":
1285                     out_java_struct += "\tpublic static " + hu_ret_ty + " with_default("
1286                 else:
1287                     out_java_struct += "\tpublic static " + hu_ret_ty + " " + meth_n + "("
1288             elif meth_n == "clone_ptr" or (struct_meth.startswith("LDKCResult") and (meth_n == "get_ok" or meth_n == "get_err")):
1289                 out_java_struct += "\tinternal " + hu_ret_ty + " " + meth_n + "("
1290             else:
1291                 if meth_n == "hash" and return_type_info.java_hu_ty == "long":
1292                     extra_java_struct_out = "\tpublic override int GetHashCode() {\n"
1293                     extra_java_struct_out += "\t\treturn (int)this.hash();\n"
1294                     extra_java_struct_out += "\t}\n"
1295                 elif meth_n == "eq" and return_type_info.java_hu_ty == "bool":
1296                     extra_java_struct_out = "\tpublic override bool Equals(object o) {\n"
1297                     extra_java_struct_out += "\t\tif (!(o is " + struct_meth + ")) return false;\n"
1298                     extra_java_struct_out += "\t\treturn this.eq((" + struct_meth + ")o);\n"
1299                     extra_java_struct_out += "\t}\n"
1300                 if meth_n == "lock":
1301                     out_java_struct += "\tpublic " + hu_ret_ty + " do_lock("
1302                 else:
1303                     out_java_struct += "\tpublic " + hu_ret_ty + " " + meth_n + "("
1304             for idx, arg in enumerate(argument_types):
1305                 if idx != 0:
1306                     if not takes_self or idx > 1:
1307                         out_java_struct += ", "
1308                 elif takes_self:
1309                     continue
1310                 if arg.java_ty != "void":
1311                     if arg.arg_name in default_constructor_args:
1312                         assert not arg.nullable
1313                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1314                             if explode_idx != 0:
1315                                 out_java_struct += (", ")
1316                             out_java_struct += (
1317                                 explode_arg.java_hu_ty + " " + arg.arg_name + "_" + explode_arg.arg_name)
1318                     else:
1319                         ty_string = arg.java_hu_ty
1320                         if arg.nullable:
1321                             #ty_string += "?" - apparently mono doesn't support the nullable stuff
1322                             pass
1323                         ty_string = self.fully_qualified_hu_ty_path(arg)
1324                         out_java_struct += ty_string + " " + arg_name_repl(arg.arg_name, arg.arg_name)
1325         out_java += (");\n")
1326         out_c += (") {\n")
1327         if out_java_struct is not None:
1328             out_java_struct += (") {\n")
1329         for info in argument_types:
1330             if info.arg_conv is not None:
1331                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1332         if return_type_info.ret_conv is not None:
1333             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1334         elif return_type_info.c_ty != "void":
1335             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1336         else:
1337             out_c += ("\t")
1338         if c_call_string is None:
1339             out_c += (method_name + "(")
1340         else:
1341             out_c += (c_call_string)
1342         for idx, info in enumerate(argument_types):
1343             if info.arg_conv_name is not None:
1344                 if idx != 0:
1345                     out_c += (", ")
1346                 elif c_call_string is not None:
1347                     continue
1348                 out_c += (info.arg_conv_name)
1349         out_c += (")")
1350         if return_type_info.ret_conv is not None:
1351             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1352         else:
1353             out_c += (";")
1354         for info in argument_types:
1355             if info.arg_conv_cleanup is not None:
1356                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1357         if return_type_info.ret_conv is not None:
1358             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1359         elif return_type_info.c_ty != "void":
1360             out_c += ("\n\treturn ret_val;")
1361         out_c += ("\n}\n\n")
1362
1363         if args_known:
1364             out_java_struct += ("\t\t")
1365             if return_type_info.java_ty != "void":
1366                 out_java_struct += (return_type_info.java_ty + " ret = ")
1367             out_java_struct += ("bindings." + method_name + "(")
1368             for idx, info in enumerate(argument_types):
1369                 if idx != 0:
1370                     out_java_struct += (", ")
1371                 if idx == 0 and takes_self:
1372                     out_java_struct += ("this.ptr")
1373                 elif info.arg_name in default_constructor_args:
1374                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1375                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1376                         if explode_idx != 0:
1377                             out_java_struct += (", ")
1378                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1379                         if explode_arg.from_hu_conv is not None:
1380                             out_java_struct += (
1381                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1382                         else:
1383                             out_java_struct += (expl_arg_name)
1384                     out_java_struct += (")")
1385                 elif info.from_hu_conv is not None:
1386                     out_java_struct += arg_name_repl(info.from_hu_conv[0], info.arg_name)
1387                 else:
1388                     out_java_struct += arg_name_repl(info.arg_name, info.arg_name)
1389             out_java_struct += (");\n")
1390
1391             # Like Java, the C# GC is quite aggressive and can finalize an object while a method
1392             # on it is operating. Unlike Java, this behavior appears to be better documented,
1393             # which is nice.
1394             for idx, info in enumerate(argument_types):
1395                 if idx == 0 and takes_self:
1396                     out_java_struct += ("\t\tGC.KeepAlive(this);\n")
1397                 elif info.arg_name in default_constructor_args:
1398                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1399                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1400                         out_java_struct += ("\t\tGC.KeepAlive(" + expl_arg_name + ");\n")
1401                 elif info.c_ty != "void":
1402                     out_java_struct += ("\t\tGC.KeepAlive(" + arg_name_repl(info.arg_name, info.arg_name) + ");\n")
1403
1404             if return_type_info.java_ty == "long" and return_type_info.java_hu_ty != "long":
1405                 out_java_struct += "\t\tif (ret >= 0 && ret <= 4096) { return null; }\n"
1406
1407             if return_type_info.to_hu_conv is not None:
1408                 if not takes_self:
1409                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t")
1410                         .replace("this", return_type_info.to_hu_conv_name) + "\n")
1411                 else:
1412                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1413
1414             for idx, info in enumerate(argument_types):
1415                 if idx == 0 and takes_self:
1416                     pass
1417                 elif info.arg_name in default_constructor_args:
1418                     for explode_arg in default_constructor_args[info.arg_name]:
1419                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1420                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1421                             out_java_struct += ("\t\t" +
1422                                 arg_name_repl(explode_arg.from_hu_conv[1], info.arg_name)
1423                                 .replace(explode_arg.arg_name, expl_arg_name)
1424                                 .replace("this", return_type_info.to_hu_conv_name) + ";\n")
1425                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1426                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1427                         out_java_struct += ("\t\t" + arg_name_repl(info.from_hu_conv[1], info.arg_name)
1428                             .replace("this", return_type_info.to_hu_conv_name)
1429                             .replace("\n", "\n\t\t") + ";\n")
1430                     else:
1431                         out_java_struct += ("\t\t" + arg_name_repl(info.from_hu_conv[1], info.arg_name)
1432                             .replace("\n", "\n\t\t") + ";\n")
1433
1434             if takes_self and not takes_self_as_ref:
1435                 out_java_struct += "\t\t" + argument_types[0].from_hu_conv[1].replace("\n", "\n\t\t").replace("this_arg", "this") + ";\n"
1436             if return_type_info.to_hu_conv_name is not None:
1437                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1438             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1439                 out_java_struct += ("\t\treturn ret;\n")
1440             out_java_struct += ("\t}\n\n")
1441
1442         return (out_java, out_c, out_java_struct + extra_java_struct_out)
1443
1444     def cleanup(self):
1445         with open(self.outdir + "src/org/ldk/impl/bindings.cs", "a") as bindings:
1446             for fn_suffix in self.function_ptrs:
1447                 jret = self.function_ptrs[fn_suffix]["ret"][0]
1448                 jargs = self.function_ptrs[fn_suffix]["args"][0]
1449
1450                 bindings.write(f"""
1451         static {jret} c_callback_{fn_suffix}(int obj_ptr, int fn_id{jargs}) {{
1452                 if (obj_ptr >= js_objs.Count) {{
1453                         Console.Error.WriteLine("Got function call on unknown/free'd JS object in {fn_suffix}");
1454                         Console.Error.Flush();
1455                         Environment.Exit(42);
1456                 }}
1457                 object obj = js_objs[obj_ptr].Target;
1458                 if (obj == null) {{
1459                         Console.Error.WriteLine("Got function call on GC'd JS object in {fn_suffix}");
1460                         Console.Error.Flush();
1461                         Environment.Exit(43);
1462                 }}
1463 """)
1464                 bindings.write("\t\tswitch (fn_id) {\n")
1465                 for f in self.function_ptrs[fn_suffix]:
1466                     if f != "ret" and f != "args" and f != "call":
1467                         bindings.write(f"""\t\t\tcase {str(f)}:
1468                                 if (!(obj is {self.function_ptrs[fn_suffix][f][0]})) {{
1469                                         Console.Error.WriteLine("Got function call to object that wasn't a {self.function_ptrs[fn_suffix][f][0]} in {fn_suffix}");
1470                                         Console.Error.Flush();
1471                                         Environment.Exit(44);
1472                                 }}\n""")
1473                         call = f"(({self.function_ptrs[fn_suffix][f][0]})obj).{self.function_ptrs[fn_suffix][f][1]}({self.function_ptrs[fn_suffix][f][2]});"
1474                         if jret != "void":
1475                             bindings.write("\t\t\t\treturn " + call)
1476                         else:
1477                             bindings.write("\t\t\t\t" + call + "\n\t\t\t\treturn;")
1478                         bindings.write("\n")
1479
1480                 bindings.write(f"""\t\t\tdefault:
1481                                 Console.Error.WriteLine("Got unknown function call with id " + fn_id + " from C in {fn_suffix}");
1482                                 Console.Error.Flush();
1483                                 Environment.Exit(45);
1484                                 return{" false" if jret == "bool" else " 0" if jret != "void" else ""};
1485                 }}
1486         }}
1487         public delegate {jret} {fn_suffix}_callback(int obj_ptr, int fn_id{jargs});
1488         static {fn_suffix}_callback {fn_suffix}_callback_inst = c_callback_{fn_suffix};
1489 """)
1490                 bindings.write(self.native_meth_decl(f"register_{fn_suffix}_invoker", "int") + f"({fn_suffix}_callback callee);\n")
1491                 # Easiest way to get a static run is just define a variable, even if we dont care
1492                 bindings.write(f"\tstatic int _run_{fn_suffix}_registration = register_{fn_suffix}_invoker({fn_suffix}_callback_inst);")
1493
1494             bindings.write("""
1495 }
1496 } } }""")