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

   1 from bindingstypes import ConvInfo
   2 from enum import Enum
   3
   4 def first_to_lower(string: str) -> str:
   5     first = string[0]
   6     return first.lower() + string[1:]
   7
   8
   9 class Target(Enum):
  10     NODEJS = 1,
  11     BROWSER = 2
  12
  13 class Consts:
  14     def __init__(self, DEBUG: bool, target: Target, outdir: str, **kwargs):
  15         self.outdir = outdir
  16         self.struct_file_suffixes = {}
  17         self.function_ptr_counter = 0
  18         self.function_ptrs = {}
  19         self.c_type_map = dict(
  20             uint8_t = ['number', 'number', 'Uint8Array'],
  21             uint16_t = ['number', 'number', 'Uint16Array'],
  22             uint32_t = ['number', 'number', 'Uint32Array'],
  23             uint64_t = ['bigint', 'bigint', 'BigUint64Array'],
  24         )
  25         self.java_type_map = dict(
  26             String = "number"
  27         )
  28         self.java_hu_type_map = dict(
  29             String = "string"
  30         )
  31
  32         self.to_hu_conv_templates = dict(
  33             ptr = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  34             default = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  35         )
  36
  37         self.bindings_header = """
  38 import * as version from './version.mjs';
  39 import { UInt5, WitnessVersion } from './structs/CommonBase.mjs';
  40
  41 const imports: any = {};
  42 imports.env = {};
  43
  44 var js_objs: Array<WeakRef<object>> = [];
  45 var js_invoke: Function;
  46 var getRandomValues: Function;
  47
  48 imports.wasi_snapshot_preview1 = {
  49         "fd_write": (fd: number, iovec_array_ptr: number, iovec_array_len: number, bytes_written_ptr: number) => {
  50                 // This should generally only be used to print panic messages
  51                 const ptr_len_view = new Uint32Array(wasm.memory.buffer, iovec_array_ptr, iovec_array_len * 2);
  52                 var bytes_written = 0;
  53                 for (var i = 0; i < iovec_array_len; i++) {
  54                         const bytes_view = new Uint8Array(wasm.memory.buffer, ptr_len_view[i*2], ptr_len_view[i*2+1]);
  55                         console.log("[fd " + fd + "]: " + String.fromCharCode(...bytes_view));
  56                         bytes_written += ptr_len_view[i*2+1];
  57                 }
  58                 const written_view = new Uint32Array(wasm.memory.buffer, bytes_written_ptr, 1);
  59                 written_view[0] = bytes_written;
  60                 return 0;
  61         },
  62         "fd_close": (_fd: number) => {
  63                 // This is not generally called, but may be referenced in debug builds
  64                 console.log("wasi_snapshot_preview1:fd_close");
  65                 return 58; // Not Supported
  66         },
  67         "fd_seek": (_fd: number, _offset: bigint, _whence: number, _new_offset: number) => {
  68                 // This is not generally called, but may be referenced in debug builds
  69                 console.log("wasi_snapshot_preview1:fd_seek");
  70                 return 58; // Not Supported
  71         },
  72         "random_get": (buf_ptr: number, buf_len: number) => {
  73                 const buf = new Uint8Array(wasm.memory.buffer, buf_ptr, buf_len);
  74                 getRandomValues(buf);
  75                 return 0;
  76         },
  77         "environ_sizes_get": (environ_var_count_ptr: number, environ_len_ptr: number) => {
  78                 // This is called before fd_write to format + print panic messages
  79                 const out_count_view = new Uint32Array(wasm.memory.buffer, environ_var_count_ptr, 1);
  80                 out_count_view[0] = 0;
  81                 const out_len_view = new Uint32Array(wasm.memory.buffer, environ_len_ptr, 1);
  82                 out_len_view[0] = 0;
  83                 return 0;
  84         },
  85         "environ_get": (environ_ptr: number, environ_buf_ptr: number) => {
  86                 // This is called before fd_write to format + print panic messages,
  87                 // but only if we have variables in environ_sizes_get, so shouldn't ever actually happen!
  88                 console.log("wasi_snapshot_preview1:environ_get");
  89                 return 58; // Note supported - we said there were 0 environment entries!
  90         },
  91         "proc_exit" : () => {
  92                 console.log("wasi_snapshot_preview1:proc_exit");
  93         },
  94 };
  95
  96 var wasm: any = null;
  97 let isWasmInitialized: boolean = false;
  98
  99 async function finishInitializeWasm(wasmInstance: WebAssembly.Instance) {
 100         if (typeof crypto === "undefined") {
 101                 var crypto_import = (await import('crypto')).webcrypto;
 102                 getRandomValues = crypto_import.getRandomValues.bind(crypto_import);
 103         } else {
 104                 getRandomValues = crypto.getRandomValues.bind(crypto);
 105         }
 106
 107         wasm = wasmInstance.exports;
 108         if (!wasm.test_bigint_pass_deadbeef0badf00d(BigInt("0xdeadbeef0badf00d"))) {
 109                 throw new Error(\"Currently need BigInt-as-u64 support, try ----experimental-wasm-bigint");
 110         }
 111
 112         if (decodeString(wasm.TS_get_lib_version_string()) !== version.get_ldk_java_bindings_version())
 113                 throw new Error(\"Compiled LDK library and LDK class files do not match\");
 114         // Fetching the LDK versions from C also checks that the header and binaries match
 115         const c_bindings_ver: number = wasm.TS_get_ldk_c_bindings_version();
 116         const ldk_ver: number = wasm.TS_get_ldk_version();
 117         if (c_bindings_ver == 0)
 118                 throw new Error(\"LDK version did not match the header we built against\");
 119         if (ldk_ver == 0)
 120                 throw new Error(\"LDK C bindings version did not match the header we built against\");
 121         const c_bindings_version: string = decodeString(c_bindings_ver)
 122         const ldk_version: string = decodeString(ldk_ver);
 123         console.log(\"Loaded LDK-Java Bindings with LDK \" + ldk_version + \" and LDK-C-Bindings \" + c_bindings_version);
 124
 125         isWasmInitialized = true;
 126 }
 127
 128 const fn_list = ["uuuuuu", "buuuuu", "bbbbbb", "ubuuuu", "uubuuu"];
 129
 130 /* @internal */
 131 export async function initializeWasmFromUint8Array(wasmBinary: Uint8Array) {
 132         for (const fn of fn_list) { imports.env["js_invoke_function_" + fn] = js_invoke; }
 133         const { instance: wasmInstance } = await WebAssembly.instantiate(wasmBinary, imports);
 134         await finishInitializeWasm(wasmInstance);
 135 }
 136
 137 /* @internal */
 138 export async function initializeWasmFetch(uri: string) {
 139         for (const fn of fn_list) { imports.env["js_invoke_function_" + fn] = js_invoke; }
 140         const stream = fetch(uri);
 141         const { instance: wasmInstance } = await WebAssembly.instantiateStreaming(stream, imports);
 142         await finishInitializeWasm(wasmInstance);
 143 }"""
 144
 145         self.bindings_header += """
 146 // WASM CODEC
 147
 148 /* @internal */
 149 export function uint5ArrToBytes(inputArray: Array<UInt5>): Uint8Array {
 150         const arr = new Uint8Array(inputArray.length);
 151         for (var i = 0; i < inputArray.length; i++) {
 152                 arr[i] = inputArray[i].getVal();
 153         }
 154         return arr;
 155 }
 156
 157 /* @internal */
 158 export function WitnessVersionArrToBytes(inputArray: Array<WitnessVersion>): Uint8Array {
 159         const arr = new Uint8Array(inputArray.length);
 160         for (var i = 0; i < inputArray.length; i++) {
 161                 arr[i] = inputArray[i].getVal();
 162         }
 163         return arr;
 164 }
 165
 166
 167
 168 /* @internal */
 169 export function encodeUint8Array (inputArray: Uint8Array): number {
 170         const cArrayPointer = wasm.TS_malloc(inputArray.length + 4);
 171         const arrayLengthView = new Uint32Array(wasm.memory.buffer, cArrayPointer, 1);
 172         arrayLengthView[0] = inputArray.length;
 173         const arrayMemoryView = new Uint8Array(wasm.memory.buffer, cArrayPointer + 4, inputArray.length);
 174         arrayMemoryView.set(inputArray);
 175         return cArrayPointer;
 176 }
 177 /* @internal */
 178 export function encodeUint32Array (inputArray: Uint32Array|Array<number>): number {
 179         const cArrayPointer = wasm.TS_malloc((inputArray.length + 1) * 4);
 180         const arrayMemoryView = new Uint32Array(wasm.memory.buffer, cArrayPointer, inputArray.length);
 181         arrayMemoryView.set(inputArray, 1);
 182         arrayMemoryView[0] = inputArray.length;
 183         return cArrayPointer;
 184 }
 185 /* @internal */
 186 export function encodeUint64Array (inputArray: BigUint64Array|Array<bigint>): number {
 187         const cArrayPointer = wasm.TS_malloc(inputArray.length * 8 + 1);
 188         const arrayLengthView = new Uint32Array(wasm.memory.buffer, cArrayPointer, 1);
 189         arrayLengthView[0] = inputArray.length;
 190         const arrayMemoryView = new BigUint64Array(wasm.memory.buffer, cArrayPointer + 4, inputArray.length);
 191         arrayMemoryView.set(inputArray);
 192         return cArrayPointer;
 193 }
 194
 195 /* @internal */
 196 export function check_arr_len(arr: Uint8Array, len: number): Uint8Array {
 197         if (arr.length != len) { throw new Error("Expected array of length " + len + " got " + arr.length); }
 198         return arr;
 199 }
 200
 201 /* @internal */
 202 export function getArrayLength(arrayPointer: number): number {
 203         const arraySizeViewer = new Uint32Array(wasm.memory.buffer, arrayPointer, 1);
 204         return arraySizeViewer[0];
 205 }
 206 /* @internal */
 207 export function decodeUint8Array (arrayPointer: number, free = true): Uint8Array {
 208         const arraySize = getArrayLength(arrayPointer);
 209         const actualArrayViewer = new Uint8Array(wasm.memory.buffer, arrayPointer + 4, arraySize);
 210         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 211         // will free the underlying memory when it becomes unreachable instead of copying here.
 212         // Note that doing so may have edge-case interactions with memory resizing (invalidating the buffer).
 213         const actualArray = actualArrayViewer.slice(0, arraySize);
 214         if (free) {
 215                 wasm.TS_free(arrayPointer);
 216         }
 217         return actualArray;
 218 }
 219 const decodeUint32Array = (arrayPointer: number, free = true) => {
 220         const arraySize = getArrayLength(arrayPointer);
 221         const actualArrayViewer = new Uint32Array(
 222                 wasm.memory.buffer, // value
 223                 arrayPointer + 4, // offset (ignoring length bytes)
 224                 arraySize // uint32 count
 225         );
 226         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 227         // will free the underlying memory when it becomes unreachable instead of copying here.
 228         const actualArray = actualArrayViewer.slice(0, arraySize);
 229         if (free) {
 230                 wasm.TS_free(arrayPointer);
 231         }
 232         return actualArray;
 233 }
 234 /* @internal */
 235 export function decodeUint64Array (arrayPointer: number, free = true): bigint[] {
 236         const arraySize = getArrayLength(arrayPointer);
 237         const actualArrayViewer = new BigUint64Array(
 238                 wasm.memory.buffer, // value
 239                 arrayPointer + 4, // offset (ignoring length bytes)
 240                 arraySize // uint32 count
 241         );
 242         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 243         // will free the underlying memory when it becomes unreachable instead of copying here.
 244         const actualArray = new Array(arraySize);
 245         for (var i = 0; i < arraySize; i++) actualArray[i] = actualArrayViewer[i];
 246         if (free) {
 247                 wasm.TS_free(arrayPointer);
 248         }
 249         return actualArray;
 250 }
 251
 252 export function freeWasmMemory(pointer: number) { wasm.TS_free(pointer); }
 253
 254 /* @internal */
 255 export function getU32ArrayElem(arrayPointer: number, idx: number): number {
 256         const actualArrayViewer = new Uint32Array(wasm.memory.buffer, arrayPointer + 4, idx + 1);
 257         return actualArrayViewer[idx];
 258 }
 259
 260 /* @internal */
 261 export function getU8ArrayElem(arrayPointer: number, idx: number): number {
 262         const actualArrayViewer = new Uint8Array(wasm.memory.buffer, arrayPointer + 4, idx + 1);
 263         return actualArrayViewer[idx];
 264 }
 265
 266
 267 /* @internal */
 268 export function encodeString(str: string): number {
 269         const charArray = new TextEncoder().encode(str);
 270         return encodeUint8Array(charArray);
 271 }
 272
 273 /* @internal */
 274 export function decodeString(stringPointer: number, free = true): string {
 275         const arraySize = getArrayLength(stringPointer);
 276         const memoryView = new Uint8Array(wasm.memory.buffer, stringPointer + 4, arraySize);
 277         const result = new TextDecoder("utf-8").decode(memoryView);
 278
 279         if (free) {
 280                 wasm.TS_free(stringPointer);
 281         }
 282
 283         return result;
 284 }
 285 """
 286         if DEBUG:
 287             self.bindings_header += """
 288 /* @internal */
 289 export function getRemainingAllocationCount(): number {
 290         return wasm.TS_allocs_remaining();
 291 }
 292 /* @internal */
 293 export function debugPrintRemainingAllocs() {
 294         wasm.TS_print_leaks();
 295 }
 296 """
 297         else:
 298             self.bindings_header += "\n/* @internal */ export function getRemainingAllocationCount(): number { return 0; }\n"
 299             self.bindings_header += "/* @internal */ export function debugPrintRemainingAllocs() { }\n"
 300
 301         with open(outdir + "/index.mts", 'a') as index:
 302             index.write("""import { initializeWasmFetch, initializeWasmFromUint8Array } from './bindings.mjs';
 303 /** Initializes the WASM backend by calling `fetch()` on the given URI - Browser only */
 304 export async function initializeWasmWebFetch(uri: string) {
 305         await initializeWasmFetch(uri);
 306 }
 307 /** Initializes the WASM backend given a Uint8Array of the .wasm binary file - Browser or Node.JS */
 308 export async function initializeWasmFromBinary(bin: Uint8Array) {
 309         await initializeWasmFromUint8Array(bin);
 310 }
 311
 312 """)
 313
 314         self.bindings_version_file = """export function get_ldk_java_bindings_version(): String {
 315         return "<git_version_ldk_garbagecollected>";
 316 }"""
 317
 318         self.bindings_footer = ""
 319
 320         self.common_base = """
 321 function freer(f: () => void) { f() }
 322 const finalizer = new FinalizationRegistry(freer);
 323 function get_freeer(ptr: number, free_fn: (ptr: number) => void) {
 324         return () => {
 325                 free_fn(ptr);
 326         }
 327 }
 328
 329 export class CommonBase {
 330         protected ptr: number;
 331         protected ptrs_to: object[] = [];
 332         protected constructor(ptr: number, free_fn: (ptr: number) => void) {
 333                 this.ptr = ptr;
 334                 if (Number.isFinite(ptr) && ptr != 0){
 335                         finalizer.register(this, get_freeer(ptr, free_fn), this);
 336                 }
 337         }
 338         // In Java, protected means "any subclass can access fields on any other subclass'"
 339         // In TypeScript, protected means "any subclass can access parent fields on instances of itself"
 340         // To work around this, we add accessors for other instances' protected fields here.
 341         protected static add_ref_from(holder: CommonBase, referent: object) {
 342                 holder.ptrs_to.push(referent);
 343         }
 344         protected static get_ptr_of(o: CommonBase) {
 345                 return o.ptr;
 346         }
 347         protected static set_null_skip_free(o: CommonBase) {
 348                 o.ptr = 0;
 349                 // @ts-ignore TypeScript is wrong about the returnvalue of unregister here!
 350                 const did_unregister: boolean = finalizer.unregister(o);
 351                 if (!did_unregister)
 352                         throw new Error("FinalizationRegistry unregister should always unregister unless you double-free'd");
 353         }
 354 }
 355
 356 export class UInt5 {
 357         public constructor(private val: number) {
 358                 if (val > 32 || val < 0) throw new Error("UInt5 value is out of range");
 359         }
 360         public getVal(): number {
 361                 return this.val;
 362         }
 363 }
 364
 365 export class WitnessVersion {
 366         public constructor(private val: number) {
 367                 if (val > 16 || val < 0) throw new Error("WitnessVersion value is out of range");
 368         }
 369         public getVal(): number {
 370                 return this.val;
 371         }
 372 }
 373
 374 export class UnqualifiedError {
 375         public constructor(val: number) {}
 376 }
 377 """
 378
 379         self.txout_defn = """export class TxOut extends CommonBase {
 380         /** The script_pubkey in this output */
 381         public script_pubkey: Uint8Array;
 382         /** The value, in satoshis, of this output */
 383         public value: bigint;
 384
 385         /* @internal */
 386         public constructor(_dummy: object, ptr: number) {
 387                 super(ptr, bindings.TxOut_free);
 388                 this.script_pubkey = bindings.decodeUint8Array(bindings.TxOut_get_script_pubkey(ptr));
 389                 this.value = bindings.TxOut_get_value(ptr);
 390         }
 391         public static constructor_new(value: bigint, script_pubkey: Uint8Array): TxOut {
 392                 return new TxOut(null, bindings.TxOut_new(bindings.encodeUint8Array(script_pubkey), value));
 393         }
 394 }"""
 395         self.obj_defined(["TxOut"], "structs")
 396
 397         self.c_file_pfx = """#include "js-wasm.h"
 398 #include <stdatomic.h>
 399 #include <lightning.h>
 400
 401 // These should be provided...somehow...
 402 void *memset(void *s, int c, size_t n);
 403 void *memcpy(void *dest, const void *src, size_t n);
 404 int memcmp(const void *s1, const void *s2, size_t n);
 405
 406 extern void __attribute__((noreturn)) abort(void);
 407 static inline void assert(bool expression) {
 408         if (!expression) { abort(); }
 409 }
 410
 411 uint32_t __attribute__((export_name("test_bigint_pass_deadbeef0badf00d"))) test_bigint_pass_deadbeef0badf00d(uint64_t val) {
 412         return val == 0xdeadbeef0badf00dULL;
 413 }
 414
 415 """
 416
 417         if not DEBUG:
 418             self.c_file_pfx += """
 419 void *malloc(size_t size);
 420 void free(void *ptr);
 421
 422 #define MALLOC(a, _) malloc(a)
 423 #define do_MALLOC(a, _b, _c) malloc(a)
 424 #define FREE(p) if ((unsigned long)(p) > 4096) { free(p); }
 425 #define DO_ASSERT(a) (void)(a)
 426 #define CHECK(a)
 427 #define CHECK_ACCESS(p)
 428 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v)
 429 """
 430         else:
 431             self.c_file_pfx += """
 432 extern int snprintf(char *str, size_t size, const char *format, ...);
 433 typedef int32_t ssize_t;
 434 ssize_t write(int fd, const void *buf, size_t count);
 435 #define DEBUG_PRINT(...) do { \\
 436         char debug_str[1024]; \\
 437         int s_len = snprintf(debug_str, 1023, __VA_ARGS__); \\
 438         write(2, debug_str, s_len); \\
 439 } while (0);
 440
 441 // Always run a, then assert it is true:
 442 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 443 // Assert a is true or do nothing
 444 #define CHECK(a) DO_ASSERT(a)
 445
 446 // Running a leak check across all the allocations and frees of the JDK is a mess,
 447 // so instead we implement our own naive leak checker here, relying on the -wrap
 448 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 449 // and free'd in Rust or C across the generated bindings shared library.
 450
 451 #define BT_MAX 128
 452 typedef struct allocation {
 453         struct allocation* next;
 454         void* ptr;
 455         const char* struct_name;
 456         int lineno;
 457 } allocation;
 458 static allocation* allocation_ll = NULL;
 459 static allocation* freed_ll = NULL;
 460
 461 extern void* __real_malloc(size_t len);
 462 extern void* __real_calloc(size_t nmemb, size_t len);
 463 extern void* __real_aligned_alloc(size_t alignment, size_t size);
 464 static void new_allocation(void* res, const char* struct_name, int lineno) {
 465         allocation* new_alloc = __real_malloc(sizeof(allocation));
 466         new_alloc->ptr = res;
 467         new_alloc->struct_name = struct_name;
 468         new_alloc->next = allocation_ll;
 469         new_alloc->lineno = lineno;
 470         allocation_ll = new_alloc;
 471 }
 472 static void* do_MALLOC(size_t len, const char* struct_name, int lineno) {
 473         void* res = __real_malloc(len);
 474         new_allocation(res, struct_name, lineno);
 475         return res;
 476 }
 477 #define MALLOC(len, struct_name) do_MALLOC(len, struct_name, __LINE__)
 478
 479 void __real_free(void* ptr);
 480 static void alloc_freed(void* ptr, int lineno) {
 481         allocation* p = NULL;
 482         allocation* it = allocation_ll;
 483         while (it->ptr != ptr) {
 484                 p = it; it = it->next;
 485                 if (it == NULL) {
 486                         p = NULL;
 487                         it = freed_ll;
 488                         while (it && it->ptr != ptr) { p = it; it = it->next; }
 489                         if (it == NULL) {
 490                                 DEBUG_PRINT("Tried to free unknown pointer %p at line %d.\\n", ptr, lineno);
 491                         } else {
 492                                 DEBUG_PRINT("Tried to free unknown pointer %p at line %d.\\n Possibly double-free from %s, allocated on line %d.", ptr, lineno, it->struct_name, it->lineno);
 493                         }
 494                         abort();
 495                 }
 496         }
 497         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 498         DO_ASSERT(it->ptr == ptr);
 499         it->next = freed_ll;
 500         freed_ll = it;
 501 }
 502 static void do_FREE(void* ptr, int lineno) {
 503         if ((unsigned long)ptr <= 4096) return; // Rust loves to create pointers to the NULL page for dummys
 504         alloc_freed(ptr, lineno);
 505         __real_free(ptr);
 506 }
 507 #define FREE(ptr) do_FREE(ptr, __LINE__)
 508
 509 static void CHECK_ACCESS(const void* ptr) {
 510         allocation* it = allocation_ll;
 511         while (it->ptr != ptr) {
 512                 it = it->next;
 513                 if (it == NULL) {
 514                         return; // addrsan should catch malloc-unknown and print more info than we have
 515                 }
 516         }
 517 }
 518 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v) \\
 519         if (v.is_owned && v.inner != NULL) { \\
 520                 const void *p = __unmangle_inner_ptr(v.inner); \\
 521                 if (p != NULL) { \\
 522                         CHECK_ACCESS(p); \\
 523                 } \\
 524         }
 525
 526 void* __wrap_malloc(size_t len) {
 527         void* res = __real_malloc(len);
 528         new_allocation(res, "malloc call", 0);
 529         return res;
 530 }
 531 void* __wrap_calloc(size_t nmemb, size_t len) {
 532         void* res = __real_calloc(nmemb, len);
 533         new_allocation(res, "calloc call", 0);
 534         return res;
 535 }
 536 void* __wrap_aligned_alloc(size_t alignment, size_t size) {
 537         void* res = __real_aligned_alloc(alignment, size);
 538         new_allocation(res, "aligned_alloc call", 0);
 539         return res;
 540 }
 541 void __wrap_free(void* ptr) {
 542         if (ptr == NULL) return;
 543         alloc_freed(ptr, 0);
 544         __real_free(ptr);
 545 }
 546
 547 void* __real_realloc(void* ptr, size_t newlen);
 548 void* __wrap_realloc(void* ptr, size_t len) {
 549         if (ptr != NULL) alloc_freed(ptr, 0);
 550         void* res = __real_realloc(ptr, len);
 551         new_allocation(res, "realloc call", 0);
 552         return res;
 553 }
 554 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 555         // Rust doesn't seem to use reallocarray currently
 556         DO_ASSERT(false);
 557 }
 558
 559 uint32_t __attribute__((export_name("TS_allocs_remaining"))) allocs_remaining() {
 560         uint32_t count = 0;
 561         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 562                 count++;
 563         }
 564         return count;
 565 }
 566 void __attribute__((export_name("TS_print_leaks"))) print_leaks() {
 567         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 568                 DEBUG_PRINT("%s %p remains. Allocated on line %d\\n", a->struct_name, a->ptr, a->lineno);
 569         }
 570 }
 571 """
 572         self.c_file_pfx = self.c_file_pfx + """
 573 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 574 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 575 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 576 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 577
 578 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 579
 580 #define DECL_ARR_TYPE(ty, name) \\
 581         struct name##array { \\
 582                 uint32_t arr_len; \\
 583                 ty elems[]; \\
 584         }; \\
 585         typedef struct name##array * name##Array; \\
 586         static inline name##Array init_##name##Array(size_t arr_len, int lineno) { \\
 587                 name##Array arr = (name##Array)do_MALLOC(arr_len * sizeof(ty) + sizeof(uint32_t), #name" array init", lineno); \\
 588                 arr->arr_len = arr_len; \\
 589                 return arr; \\
 590         }
 591
 592 DECL_ARR_TYPE(int64_t, int64_t);
 593 DECL_ARR_TYPE(int8_t, int8_t);
 594 DECL_ARR_TYPE(uint32_t, uint32_t);
 595 DECL_ARR_TYPE(void*, ptr);
 596 DECL_ARR_TYPE(char, char);
 597 typedef charArray jstring;
 598
 599 static inline jstring str_ref_to_ts(const char* chars, size_t len) {
 600         charArray arr = init_charArray(len, __LINE__);
 601         memcpy(arr->elems, chars, len);
 602         return arr;
 603 }
 604 static inline LDKStr str_ref_to_owned_c(const jstring str) {
 605         char* newchars = MALLOC(str->arr_len + 1, "String chars");
 606         memcpy(newchars, str->elems, str->arr_len);
 607         newchars[str->arr_len] = 0;
 608         LDKStr res = {
 609                 .chars = newchars,
 610                 .len = str->arr_len,
 611                 .chars_is_owned = true
 612         };
 613         return res;
 614 }
 615
 616 typedef bool jboolean;
 617
 618 uint32_t __attribute__((export_name("TS_malloc"))) TS_malloc(uint32_t size) {
 619         return (uint32_t)MALLOC(size, "JS-Called malloc");
 620 }
 621 void __attribute__((export_name("TS_free"))) TS_free(uint32_t ptr) {
 622         FREE((void*)ptr);
 623 }
 624
 625 jstring __attribute__((export_name("TS_get_ldk_c_bindings_version"))) TS_get_ldk_c_bindings_version() {
 626         const char *res = check_get_ldk_bindings_version();
 627         if (res == NULL) return NULL;
 628         return str_ref_to_ts(res, strlen(res));
 629 }
 630 jstring __attribute__((export_name("TS_get_ldk_version"))) get_ldk_version() {
 631         const char *res = check_get_ldk_version();
 632         if (res == NULL) return NULL;
 633         return str_ref_to_ts(res, strlen(res));
 634 }
 635 #include "version.c"
 636 """
 637
 638         self.c_version_file = """jstring __attribute__((export_name("TS_get_lib_version_string"))) TS_get_lib_version_string() {
 639         return str_ref_to_ts("<git_version_ldk_garbagecollected>", strlen("<git_version_ldk_garbagecollected>"));
 640 }"""
 641
 642         self.hu_struct_file_prefix = """
 643 import { CommonBase, UInt5, WitnessVersion, UnqualifiedError } from './CommonBase.mjs';
 644 import * as bindings from '../bindings.mjs'
 645
 646 """
 647         self.util_fn_pfx = self.hu_struct_file_prefix + "\nexport class UtilMethods extends CommonBase {\n"
 648         self.util_fn_sfx = "}"
 649         self.c_fn_ty_pfx = ""
 650         self.file_ext = ".mts"
 651         self.ptr_c_ty = "uint32_t"
 652         self.ptr_native_ty = "number"
 653         self.result_c_ty = "uint32_t"
 654         self.ptr_arr = "ptrArray"
 655         self.is_arr_some_check = ("", " != 0")
 656         self.get_native_arr_len_call = ("", "->arr_len")
 657
 658     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 659         return None
 660     def create_native_arr_call(self, arr_len, ty_info):
 661         if ty_info.c_ty == "ptrArray":
 662             assert ty_info.rust_obj == "LDKCVec_u5Z" or (ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"))
 663         return "init_" + ty_info.c_ty + "(" + arr_len + ", __LINE__)"
 664     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 665         if ty_info.c_ty == "int8_tArray":
 666             return ("memcpy(" + arr_name + "->elems, ", ", " + arr_len + ")")
 667         else:
 668             assert False
 669     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 670         if ty_info.c_ty == "int8_tArray":
 671             if copy:
 672                 return "memcpy(" + dest_name + ", " + arr_name + "->elems, " + arr_len + "); FREE(" + arr_name + ")"
 673         assert not copy
 674         if ty_info.c_ty == "ptrArray":
 675             return "(void*) " + arr_name + "->elems"
 676         else:
 677             return arr_name + "->elems"
 678     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 679         assert False # Only called if above is None
 680     def get_native_arr_ptr_call(self, ty_info):
 681         if ty_info.subty is not None:
 682             return "(" + ty_info.subty.c_ty + "*)(((uint8_t*)", ") + 4)"
 683         return "(" + ty_info.c_ty + "*)(((uint8_t*)", ") + 4)"
 684     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 685         return None
 686     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 687         if ty_info.c_ty == "int8_tArray":
 688             return "FREE(" + arr_name + ");"
 689         else:
 690             return "FREE(" + arr_name + ")"
 691
 692     def map_hu_array_elems(self, arr_name, conv_name, arr_ty, elem_ty):
 693         if elem_ty.rust_obj == "LDKu5":
 694             return arr_name + " != null ? bindings.uint5ArrToBytes(" + arr_name + ") : null"
 695         assert elem_ty.c_ty == "uint32_t" or elem_ty.c_ty.endswith("Array")
 696         return arr_name + " != null ? " + arr_name + ".map(" + conv_name + " => " + elem_ty.from_hu_conv[0] + ") : null"
 697
 698     def str_ref_to_native_call(self, var_name, str_len):
 699         return "str_ref_to_ts(" + var_name + ", " + str_len + ")"
 700     def str_ref_to_c_call(self, var_name):
 701         return "str_ref_to_owned_c(" + var_name + ")"
 702     def str_to_hu_conv(self, var_name):
 703         return "const " + var_name + "_conv: string = bindings.decodeString(" + var_name + ");"
 704     def str_from_hu_conv(self, var_name):
 705         return ("bindings.encodeString(" + var_name + ")", "")
 706
 707     def c_fn_name_define_pfx(self, fn_name, have_args):
 708         return " __attribute__((export_name(\"TS_" + fn_name + "\"))) TS_" + fn_name + "("
 709
 710     def init_str(self):
 711         return ""
 712
 713     def get_java_arr_len(self, arr_name):
 714         return "bindings.getArrayLength(" + arr_name + ")"
 715     def get_java_arr_elem(self, elem_ty, arr_name, idx):
 716         if elem_ty.c_ty == "uint32_t" or elem_ty.c_ty == "uintptr_t" or elem_ty.c_ty.endswith("Array"):
 717             return "bindings.getU32ArrayElem(" + arr_name + ", " + idx + ")"
 718         elif elem_ty.rust_obj == "LDKu5":
 719             return "bindings.getU8ArrayElem(" + arr_name + ", " + idx + ")"
 720         else:
 721             assert False
 722     def constr_hu_array(self, ty_info, arr_len):
 723         return "new Array(" + arr_len + ").fill(null)"
 724     def cleanup_converted_native_array(self, ty_info, arr_name):
 725         return "bindings.freeWasmMemory(" + arr_name + ")"
 726
 727     def primitive_arr_from_hu(self, mapped_ty, fixed_len, arr_name):
 728         inner = arr_name
 729         if fixed_len is not None:
 730             assert mapped_ty.c_ty == "int8_t"
 731             inner = "bindings.check_arr_len(" + arr_name + ", " + fixed_len + ")"
 732         if mapped_ty.c_ty.endswith("Array"):
 733             return ("bindings.encodeUint32Array(" + inner + ")", "")
 734         elif mapped_ty.c_ty == "uint8_t" or mapped_ty.c_ty == "int8_t":
 735             return ("bindings.encodeUint8Array(" + inner + ")", "")
 736         elif mapped_ty.c_ty == "uint32_t":
 737             return ("bindings.encodeUint32Array(" + inner + ")", "")
 738         elif mapped_ty.c_ty == "int64_t":
 739             return ("bindings.encodeUint64Array(" + inner + ")", "")
 740         else:
 741             print(mapped_ty.c_ty)
 742             assert False
 743
 744     def primitive_arr_to_hu(self, mapped_ty, fixed_len, arr_name, conv_name):
 745         if mapped_ty.c_ty == "uint8_t" or mapped_ty.c_ty == "int8_t":
 746             return "const " + conv_name + ": Uint8Array = bindings.decodeUint8Array(" + arr_name + ");"
 747         elif mapped_ty.c_ty == "uint64_t" or mapped_ty.c_ty == "int64_t":
 748             return "const " + conv_name + ": bigint[] = bindings.decodeUint64Array(" + arr_name + ");"
 749         else:
 750             assert False
 751
 752     def var_decl_statement(self, ty_string, var_name, statement):
 753         return "const " + var_name + ": " + ty_string + " = " + statement
 754
 755     def java_arr_ty_str(self, elem_ty_str):
 756         return "number"
 757
 758     def for_n_in_range(self, n, minimum, maximum):
 759         return "for (var " + n + " = " + minimum + "; " + n + " < " + maximum + "; " + n + "++) {"
 760     def for_n_in_arr(self, n, arr_name, arr_elem_ty):
 761         return (arr_name + ".forEach((" + n + ": " + arr_elem_ty.java_hu_ty + ") => { ", " })")
 762
 763     def get_ptr(self, var):
 764         return "CommonBase.get_ptr_of(" + var + ")"
 765     def set_null_skip_free(self, var):
 766         return "CommonBase.set_null_skip_free(" + var + ");"
 767
 768     def add_ref(self, holder, referent):
 769         return "CommonBase.add_ref_from(" + holder + ", " + referent + ")"
 770
 771     def obj_defined(self, struct_names, folder):
 772         with open(self.outdir + "/index.mts", 'a') as index:
 773             index.write(f"export * from './{folder}/{struct_names[0]}.mjs';\n")
 774         with open(self.outdir + "/imports.mts.part", 'a') as imports:
 775             imports.write(f"import {{ {', '.join(struct_names)} }} from '../{folder}/{struct_names[0]}.mjs';\n")
 776
 777     def fully_qualified_hu_ty_path(self, ty):
 778         return ty.java_hu_ty
 779
 780     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 781         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_js(int32_t ord) {\n"
 782         out_c = out_c + "\tswitch (ord) {\n"
 783         ord_v = 0
 784
 785         out_typescript_enum_fields = ""
 786
 787         for var, var_docs in variants:
 788             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 789             ord_v = ord_v + 1
 790             if var_docs is not None:
 791                 var_docs_repld = var_docs.replace("\n", "\n\t")
 792                 out_typescript_enum_fields += f"/**\n\t * {var_docs_repld}\n\t */\n"
 793             out_typescript_enum_fields += f"\t{var},\n\t"
 794         out_c = out_c + "\t}\n"
 795         out_c = out_c + "\tabort();\n"
 796         out_c = out_c + "}\n"
 797
 798         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_js(LDK" + struct_name + " val) {\n"
 799         out_c = out_c + "\tswitch (val) {\n"
 800         ord_v = 0
 801         for var, _ in variants:
 802             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 803             ord_v = ord_v + 1
 804         out_c = out_c + "\t\tdefault: abort();\n"
 805         out_c = out_c + "\t}\n"
 806         out_c = out_c + "}\n"
 807
 808         # Note that this is *not* marked /* @internal */ as we re-expose it directly in enums/
 809         enum_comment_formatted = enum_doc_comment.replace("\n", "\n * ")
 810         out_typescript = f"""
 811 /**
 812  * {enum_comment_formatted}
 813  */
 814 export enum {struct_name} {{
 815         {out_typescript_enum_fields}
 816 }}
 817 """
 818         out_typescript_enum = f"export {{ {struct_name} }} from \"../bindings.mjs\";"
 819         self.obj_defined([struct_name], "enums")
 820         return (out_c, out_typescript_enum, out_typescript)
 821
 822     def c_unitary_enum_to_native_call(self, ty_info):
 823         return (ty_info.rust_obj + "_to_js(", ")")
 824     def native_unitary_enum_to_c_call(self, ty_info):
 825         return (ty_info.rust_obj + "_from_js(", ")")
 826
 827     def native_c_map_trait(self, struct_name, field_var_conversions, flattened_field_var_conversions, field_function_lines, trait_doc_comment):
 828         out_typescript_bindings = ""
 829         super_instantiator = ""
 830         bindings_instantiator = ""
 831         pointer_to_adder = ""
 832         impl_constructor_arguments = ""
 833         for var in flattened_field_var_conversions:
 834             if isinstance(var, ConvInfo):
 835                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 836                 super_instantiator += first_to_lower(var.arg_name) + ", "
 837                 if var.from_hu_conv is not None:
 838                     bindings_instantiator += ", " + var.from_hu_conv[0]
 839                     if var.from_hu_conv[1] != "":
 840                         pointer_to_adder += "\t\t\t" + var.from_hu_conv[1] + ";\n"
 841                 else:
 842                     bindings_instantiator += ", " + first_to_lower(var.arg_name)
 843             else:
 844                 bindings_instantiator += ", " + first_to_lower(var[1]) + ".bindings_instance"
 845                 super_instantiator += first_to_lower(var[1]) + "_impl, "
 846                 pointer_to_adder += "\t\timpl_holder.held.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 847                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}Interface"
 848
 849         super_constructor_statements = ""
 850         trait_constructor_arguments = ""
 851         for var in field_var_conversions:
 852             if isinstance(var, ConvInfo):
 853                 trait_constructor_arguments += ", " + var.arg_name
 854             else:
 855                 super_constructor_statements += "\t\tconst " + first_to_lower(var[1]) + " = " + var[1] + ".new_impl(" + super_instantiator + ");\n"
 856                 trait_constructor_arguments += ", " + first_to_lower(var[1]) + ".bindings_instance"
 857                 for suparg in var[2]:
 858                     if isinstance(suparg, ConvInfo):
 859                         trait_constructor_arguments += ", " + suparg.arg_name
 860                     else:
 861                         trait_constructor_arguments += ", " + suparg[1]
 862
 863         # BUILD INTERFACE METHODS
 864         out_java_interface = ""
 865         out_interface_implementation_overrides = ""
 866         java_methods = []
 867         for fn_line in field_function_lines:
 868             java_method_descriptor = ""
 869             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 870                 out_java_interface += "\t/**" + fn_line.docs.replace("\n", "\n\t * ") + "\n\t */\n"
 871                 out_java_interface += "\t" + fn_line.fn_name + "("
 872                 out_interface_implementation_overrides += f"\t\t\t{fn_line.fn_name} ("
 873
 874                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 875                     if idx >= 1:
 876                         out_java_interface += ", "
 877                         out_interface_implementation_overrides += ", "
 878                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 879                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 880                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 881                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n"
 882                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 883                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 884
 885                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 886
 887                 for arg_info in fn_line.args_ty:
 888                     if arg_info.to_hu_conv is not None:
 889                         out_interface_implementation_overrides += "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 890
 891                 if fn_line.ret_ty_info.java_ty != "void":
 892                     out_interface_implementation_overrides += "\t\t\t\tconst ret: " + fn_line.ret_ty_info.java_hu_ty + " = arg." + fn_line.fn_name + "("
 893                 else:
 894                     out_interface_implementation_overrides += f"\t\t\t\targ." + fn_line.fn_name + "("
 895
 896                 for idx, arg_info in enumerate(fn_line.args_ty):
 897                     if idx != 0:
 898                         out_interface_implementation_overrides += ", "
 899                     if arg_info.to_hu_conv_name is not None:
 900                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 901                     else:
 902                         out_interface_implementation_overrides += arg_info.arg_name
 903
 904                 out_interface_implementation_overrides += ");\n"
 905                 if fn_line.ret_ty_info.java_ty != "void":
 906                     if fn_line.ret_ty_info.from_hu_conv is not None:
 907                         out_interface_implementation_overrides += "\t\t\t\t" + f"const result: {fn_line.ret_ty_info.java_ty} = " + fn_line.ret_ty_info.from_hu_conv[0].replace("\n", "\n\t\t\t\t") + ";\n"
 908                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 909                             out_interface_implementation_overrides += "\t\t\t\t" + fn_line.ret_ty_info.from_hu_conv[1].replace("this", "impl_holder.held").replace("\n", "\n\t\t\t\t") + ";\n"
 910                         #if fn_line.ret_ty_info.rust_obj in result_types:
 911                         # XXX: We need to handle this in conversion logic so that its cross-language!
 912                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 913                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 914                         out_interface_implementation_overrides += "\t\t\t\treturn result;\n"
 915                     else:
 916                         out_interface_implementation_overrides += "\t\t\t\treturn ret;\n"
 917                 out_interface_implementation_overrides += f"\t\t\t}},\n"
 918
 919         formatted_trait_docs = trait_doc_comment.replace("\n", "\n * ")
 920         out_typescript_human = f"""
 921 {self.hu_struct_file_prefix}
 922
 923 /** An implementation of {struct_name.replace("LDK","")} */
 924 export interface {struct_name.replace("LDK", "")}Interface {{
 925 {out_java_interface}}}
 926
 927 class {struct_name}Holder {{
 928         held: {struct_name.replace("LDK", "")};
 929 }}
 930
 931 /**
 932  * {formatted_trait_docs}
 933  */
 934 export class {struct_name.replace("LDK","")} extends CommonBase {{
 935         /* @internal */
 936         public bindings_instance?: bindings.{struct_name};
 937
 938         /* @internal */
 939         constructor(_dummy: object, ptr: number) {{
 940                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
 941                 this.bindings_instance = null;
 942         }}
 943
 944         /** Creates a new instance of {struct_name.replace("LDK","")} from a given implementation */
 945         public static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 946                 const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 947                 let structImplementation = {{
 948 {out_interface_implementation_overrides}                }} as bindings.{struct_name};
 949 {super_constructor_statements}          const ptr: number = bindings.{struct_name}_new(structImplementation{bindings_instantiator});
 950
 951                 impl_holder.held = new {struct_name.replace("LDK", "")}(null, ptr);
 952                 impl_holder.held.bindings_instance = structImplementation;
 953 {pointer_to_adder}              return impl_holder.held;
 954         }}
 955
 956 """
 957         self.obj_defined([struct_name.replace("LDK", ""), struct_name.replace("LDK", "") + "Interface"], "structs")
 958
 959         out_typescript_bindings += "/* @internal */\nexport interface " + struct_name + " {\n"
 960         java_meths = []
 961         for fn_line in field_function_lines:
 962             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 963                 out_typescript_bindings += f"\t{fn_line.fn_name} ("
 964
 965                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 966                     if idx >= 1:
 967                         out_typescript_bindings = out_typescript_bindings + ", "
 968                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 969
 970                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 971
 972         out_typescript_bindings += "}\n\n"
 973
 974         out_typescript_bindings += f"/* @internal */\nexport function {struct_name}_new(impl: {struct_name}"
 975         for var in flattened_field_var_conversions:
 976             if isinstance(var, ConvInfo):
 977                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 978             else:
 979                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 980
 981         out_typescript_bindings += f"""): number {{
 982         if(!isWasmInitialized) {{
 983                 throw new Error("initializeWasm() must be awaited first!");
 984         }}
 985         var new_obj_idx = js_objs.length;
 986         for (var i = 0; i < js_objs.length; i++) {{
 987                 if (js_objs[i] == null || js_objs[i] == undefined) {{ new_obj_idx = i; break; }}
 988         }}
 989         js_objs[i] = new WeakRef(impl);
 990         return wasm.TS_{struct_name}_new(i);
 991 }}
 992 """
 993
 994         # Now that we've written out our java code (and created java_meths), generate C
 995         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 996         out_c += "\tatomic_size_t refcnt;\n"
 997         out_c += "\tuint32_t instance_ptr;\n"
 998         for var in flattened_field_var_conversions:
 999             if isinstance(var, ConvInfo):
1000                 # We're a regular ol' field
1001                 pass
1002             else:
1003                 # We're a supertrait
1004                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
1005         out_c = out_c + "} " + struct_name + "_JCalls;\n"
1006
1007         for fn_line in field_function_lines:
1008             if fn_line.fn_name == "free":
1009                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
1010                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
1011                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
1012                 out_c = out_c + "\t\tFREE(j_calls);\n"
1013                 out_c = out_c + "\t}\n}\n"
1014
1015         for idx, fn_line in enumerate(field_function_lines):
1016             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
1017                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
1018                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
1019                 if fn_line.self_is_const:
1020                     out_c = out_c + "const void* this_arg"
1021                 else:
1022                     out_c = out_c + "void* this_arg"
1023
1024                 for idx, arg in enumerate(fn_line.args_ty):
1025                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
1026
1027                 out_c = out_c + ") {\n"
1028                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
1029
1030                 for arg_info in fn_line.args_ty:
1031                     if arg_info.ret_conv is not None:
1032                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
1033                         out_c = out_c + arg_info.arg_name
1034                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
1035
1036                 fn_suffix = ""
1037                 assert len(fn_line.args_ty) < 6
1038                 for arg_info in fn_line.args_ty:
1039                     if arg_info.c_ty == "uint64_t" or arg_info.c_ty == "int64_t":
1040                         fn_suffix += "b"
1041                     else:
1042                         fn_suffix += "u"
1043                 for i in range(0, 6 - len(fn_line.args_ty)):
1044                     fn_suffix += "u"
1045                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
1046                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (" + fn_line.ret_ty_info.c_ty + ")"
1047                     out_c += "js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1048                 elif fn_line.ret_ty_info.java_ty == "void":
1049                     out_c = out_c + "\tjs_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1050                 elif fn_line.ret_ty_info.java_hu_ty == "string":
1051                     out_c += "\tjstring ret = (jstring)js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1052                 elif not fn_line.ret_ty_info.passed_as_ptr:
1053                     out_c += "\treturn js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1054                 else:
1055                     out_c += "\tuint32_t ret = js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1056
1057                 self.function_ptrs[self.function_ptr_counter] = (struct_name, fn_line.fn_name)
1058                 self.function_ptr_counter += 1
1059
1060                 for idx, arg_info in enumerate(fn_line.args_ty):
1061                     if arg_info.ret_conv is not None:
1062                         out_c += ", (uint32_t)" + arg_info.ret_conv_name
1063                     else:
1064                         out_c += ", (uint32_t)" + arg_info.arg_name
1065                 for i in range(0, 6 - len(fn_line.args_ty)):
1066                     out_c += ", 0"
1067                 out_c = out_c + ");\n"
1068                 if fn_line.ret_ty_info.arg_conv is not None:
1069                     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"
1070
1071                 out_c = out_c + "}\n"
1072
1073         # Write out a clone function whether we need one or not, as we use them in moving to rust
1074         out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
1075         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
1076         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
1077         for var in field_var_conversions:
1078             if not isinstance(var, ConvInfo):
1079                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
1080         out_c = out_c + "}\n"
1081
1082         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (JSValue o"
1083         for var in flattened_field_var_conversions:
1084             if isinstance(var, ConvInfo):
1085                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
1086             else:
1087                 out_c = out_c + ", JSValue " + var[1]
1088         out_c = out_c + ") {\n"
1089
1090         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
1091         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
1092         out_c = out_c + "\tcalls->instance_ptr = o;\n"
1093
1094         for (fn_name, java_meth_descr) in java_meths:
1095             if fn_name != "free" and fn_name != "cloned":
1096                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
1097                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
1098
1099         for var in flattened_field_var_conversions:
1100             if isinstance(var, ConvInfo) and var.arg_conv is not None:
1101                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
1102         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
1103         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
1104         for fn_line in field_function_lines:
1105             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
1106                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
1107             elif fn_line.fn_name == "free":
1108                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
1109             else:
1110                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
1111         for var in field_var_conversions:
1112             if isinstance(var, ConvInfo):
1113                 if var.arg_conv_name is not None:
1114                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
1115                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
1116                 else:
1117                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
1118                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
1119             else:
1120                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(" + var[1]
1121                 for suparg in var[2]:
1122                     if isinstance(suparg, ConvInfo):
1123                         out_c += ", " + suparg.arg_name
1124                     else:
1125                         out_c += ", " + suparg[1]
1126                 out_c += "),\n"
1127         out_c = out_c + "\t};\n"
1128         for var in flattened_field_var_conversions:
1129             if not isinstance(var, ConvInfo):
1130                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
1131         out_c = out_c + "\treturn ret;\n"
1132         out_c = out_c + "}\n"
1133
1134         out_c = out_c + self.c_fn_ty_pfx + "long " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "JSValue o"
1135         for var in flattened_field_var_conversions:
1136             if isinstance(var, ConvInfo):
1137                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
1138             else:
1139                 out_c = out_c + ", JSValue " + var[1]
1140         out_c = out_c + ") {\n"
1141         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
1142         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(o"
1143         for var in flattened_field_var_conversions:
1144             if isinstance(var, ConvInfo):
1145                 out_c = out_c + ", " + var.arg_name
1146             else:
1147                 out_c = out_c + ", " + var[1]
1148         out_c = out_c + ");\n"
1149         out_c = out_c + "\treturn (long)res_ptr;\n"
1150         out_c = out_c + "}\n"
1151
1152         return (out_typescript_bindings, out_typescript_human, out_c)
1153
1154     def trait_struct_inc_refcnt(self, ty_info):
1155         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
1156         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
1157         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_cloned(&" + ty_info.var_name + "_conv);\n}"
1158         return base_conv
1159
1160     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
1161         bindings_type = struct_name.replace("LDK", "")
1162         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
1163
1164         out_java_enum = ""
1165         out_java = ""
1166         out_c = ""
1167
1168         out_java_enum += (self.hu_struct_file_prefix)
1169
1170         java_hu_class = "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
1171         java_hu_class += "export class " + java_hu_type + " extends CommonBase {\n"
1172         java_hu_class += "\tprotected constructor(_dummy: object, ptr: number) { super(ptr, bindings." + bindings_type + "_free); }\n"
1173         java_hu_class += "\t/* @internal */\n"
1174         java_hu_class += f"\tpublic static constr_from_ptr(ptr: number): {java_hu_type} {{\n"
1175         java_hu_class += f"\t\tconst raw_ty: number = bindings." + struct_name + "_ty_from_ptr(ptr);\n"
1176         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"
1177         out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n"
1178         out_c += "\tswitch(obj->tag) {\n"
1179         java_hu_class += "\t\tswitch (raw_ty) {\n"
1180         java_hu_subclasses = ""
1181
1182         out_java += "/* @internal */\nexport class " + struct_name + " {\n"
1183         out_java += "\tprotected constructor() {}\n"
1184         var_idx = 0
1185         for var in variant_list:
1186             java_hu_subclasses += "/** A " + java_hu_type + " of type " + var.var_name + " */\n"
1187             java_hu_subclasses += "export class " + java_hu_type + "_" + var.var_name + " extends " + java_hu_type + " {\n"
1188             java_hu_class += f"\t\t\tcase {var_idx}: "
1189             java_hu_class += "return new " + java_hu_type + "_" + var.var_name + "(ptr);\n"
1190             out_c += f"\t\tcase {struct_name}_{var.var_name}: return {var_idx};\n"
1191             hu_conv_body = ""
1192             for idx, (field_ty, field_docs) in enumerate(var.fields):
1193                 if field_docs is not None:
1194                     java_hu_subclasses += "\t/**\n\t * " + field_docs.replace("\n", "\n\t * ") + "\n\t */\n"
1195                 java_hu_subclasses += "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
1196                 if field_ty.to_hu_conv is not None:
1197                     hu_conv_body += f"\t\tconst {field_ty.arg_name}: {field_ty.java_ty} = bindings.{struct_name}_{var.var_name}_get_{field_ty.arg_name}(ptr);\n"
1198                     hu_conv_body += f"\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1199                     hu_conv_body += f"\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1200                 else:
1201                     hu_conv_body += f"\t\tthis.{field_ty.arg_name} = bindings.{struct_name}_{var.var_name}_get_{field_ty.arg_name}(ptr);\n"
1202             java_hu_subclasses += "\t/* @internal */\n"
1203             java_hu_subclasses += "\tpublic constructor(ptr: number) {\n\t\tsuper(null, ptr);\n"
1204             java_hu_subclasses = java_hu_subclasses + hu_conv_body
1205             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
1206             var_idx += 1
1207         out_java += "}\n"
1208         java_hu_class += "\t\t\tdefault:\n\t\t\t\tthrow new Error('oops, this should be unreachable'); // Unreachable without extending the (internal) bindings interface\n\t\t}\n\t}\n\n"
1209         out_java += self.fn_call_body(struct_name + "_ty_from_ptr", "uint32_t", "number", "ptr: number", "ptr")
1210         out_c += ("\t\tdefault: abort();\n")
1211         out_c += ("\t}\n}\n")
1212
1213         for var in variant_list:
1214             for idx, (field_map, _) in enumerate(var.fields):
1215                 fn_name = f"{struct_name}_{var.var_name}_get_{field_map.arg_name}"
1216                 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"
1217                 out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n"
1218                 out_c += f"\tassert(obj->tag == {struct_name}_{var.var_name});\n"
1219                 if field_map.ret_conv is not None:
1220                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1221                     if var.tuple_variant:
1222                         out_c += "obj->" + camel_to_snake(var.var_name)
1223                     else:
1224                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
1225                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1226                     out_c += "\treturn " + field_map.ret_conv_name + ";\n"
1227                 else:
1228                     if var.tuple_variant:
1229                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + ";\n"
1230                     else:
1231                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name + ";\n"
1232                 out_c += "}\n"
1233                 out_java += self.fn_call_body(fn_name, field_map.c_ty, field_map.java_ty, "ptr: number", "ptr")
1234         out_java_enum += java_hu_class
1235         self.struct_file_suffixes[java_hu_type] = java_hu_subclasses
1236         self.obj_defined([java_hu_type], "structs")
1237         return (out_java, out_java_enum, out_c)
1238
1239     def map_opaque_struct(self, struct_name, struct_doc_comment):
1240         implementations = ""
1241         method_header = ""
1242
1243         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
1244         out_opaque_struct_human = f"{self.hu_struct_file_prefix}"
1245         constructor_body = "super(ptr, bindings." + struct_name.replace("LDK","") + "_free);"
1246         extra_docs = ""
1247         extra_body = ""
1248         if struct_name.startswith("LDKLocked") or struct_name.startswith("LDKReadOnly"):
1249             extra_docs = "\n * This type represents a lock and MUST BE MANUALLY FREE'd!"
1250             constructor_body = 'super(ptr, () => { throw new Error("Locks must be manually freed with free()"); });'
1251             extra_body = f"""
1252         /** Releases this lock */
1253         public free() {{
1254                 bindings.{struct_name.replace("LDK","")}_free(this.ptr);
1255                 CommonBase.set_null_skip_free(this);
1256         }}"""
1257         formatted_doc_comment = struct_doc_comment.replace("\n", "\n * ")
1258         out_opaque_struct_human += f"""
1259 /**{extra_docs}
1260  * {formatted_doc_comment}
1261  */
1262 export class {hu_name} extends CommonBase {implementations}{{
1263         /* @internal */
1264         public constructor(_dummy: object, ptr: number) {{
1265                 {constructor_body}
1266         }}{extra_body}
1267
1268 """
1269         self.obj_defined([hu_name], "structs")
1270         return out_opaque_struct_human
1271
1272     def map_tuple(self, struct_name):
1273         return self.map_opaque_struct(struct_name, "A Tuple")
1274
1275     def map_result(self, struct_name, res_map, err_map):
1276         human_ty = struct_name.replace("LDKCResult", "Result")
1277
1278         suffixes = f"export class {human_ty}_OK extends {human_ty} {{\n"
1279         if res_map.java_hu_ty != "void":
1280             suffixes += "\tpublic res: " + res_map.java_hu_ty + ";\n"
1281         suffixes += f"""
1282         /* @internal */
1283         public constructor(_dummy: object, ptr: number) {{
1284                 super(_dummy, ptr);
1285 """
1286         if res_map.java_hu_ty == "void":
1287             pass
1288         elif res_map.to_hu_conv is not None:
1289             suffixes += "\t\tconst res: " + res_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1290             suffixes += "\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t")
1291             suffixes += "\n\t\tthis.res = " + res_map.to_hu_conv_name + ";\n"
1292         else:
1293             suffixes += "\t\tthis.res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1294         suffixes += "\t}\n}\n"
1295
1296         suffixes += f"export class {human_ty}_Err extends {human_ty} {{\n"
1297         if err_map.java_hu_ty != "void":
1298             suffixes += "\tpublic err: " + err_map.java_hu_ty + ";\n"
1299         suffixes += f"""
1300         /* @internal */
1301         public constructor(_dummy: object, ptr: number) {{
1302                 super(_dummy, ptr);
1303 """
1304         if err_map.java_hu_ty == "void":
1305             pass
1306         elif err_map.to_hu_conv is not None:
1307             suffixes += "\t\tconst err: " + err_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1308             suffixes += "\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t")
1309             suffixes += "\n\t\tthis.err = " + err_map.to_hu_conv_name + ";\n"
1310         else:
1311             suffixes += "\t\tthis.err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1312         suffixes += "\t}\n}"
1313
1314         self.struct_file_suffixes[human_ty] = suffixes
1315         self.obj_defined([human_ty], "structs")
1316
1317         return f"""{self.hu_struct_file_prefix}
1318
1319 export class {human_ty} extends CommonBase {{
1320         protected constructor(_dummy: object, ptr: number) {{
1321                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1322         }}
1323         /* @internal */
1324         public static constr_from_ptr(ptr: number): {human_ty} {{
1325                 if (bindings.{struct_name.replace("LDK", "")}_is_ok(ptr)) {{
1326                         return new {human_ty}_OK(null, ptr);
1327                 }} else {{
1328                         return new {human_ty}_Err(null, ptr);
1329                 }}
1330         }}
1331 """
1332
1333     def fn_call_body(self, method_name, return_c_ty, return_java_ty, method_argument_string, native_call_argument_string):
1334         has_return_value = return_c_ty != 'void'
1335         return_statement = 'return nativeResponseValue;'
1336         if not has_return_value:
1337             return_statement = '// debug statements here'
1338
1339         return f"""/* @internal */
1340 export function {method_name}({method_argument_string}): {return_java_ty} {{
1341         if(!isWasmInitialized) {{
1342                 throw new Error("initializeWasm() must be awaited first!");
1343         }}
1344         const nativeResponseValue = wasm.TS_{method_name}({native_call_argument_string});
1345         {return_statement}
1346 }}
1347 """
1348     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):
1349         out_java = ""
1350         out_c = ""
1351         out_java_struct = None
1352
1353         out_java += ("\t")
1354         out_c += (self.c_fn_ty_pfx)
1355         out_c += (return_type_info.c_ty)
1356         out_java += (return_type_info.java_ty)
1357         if return_type_info.ret_conv is not None:
1358             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1359         out_java += (" " + method_name + "(")
1360         out_c += (" "  + self.c_fn_name_define_pfx(method_name, True))
1361
1362         method_argument_string = ""
1363         native_call_argument_string = ""
1364         for idx, arg_conv_info in enumerate(argument_types):
1365             if idx != 0:
1366                 method_argument_string += (", ")
1367                 native_call_argument_string += ', '
1368                 out_c += (", ")
1369             if arg_conv_info.c_ty != "void":
1370                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1371                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
1372                 native_call_argument_string += arg_conv_info.arg_name
1373         out_java = self.fn_call_body(method_name, return_type_info.c_ty, return_type_info.java_ty, method_argument_string, native_call_argument_string)
1374
1375         out_java_struct = ""
1376         if doc_comment is not None:
1377             out_java_struct = "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
1378
1379         if not args_known:
1380             out_java_struct += ("\t// Skipped " + method_name + "\n")
1381         else:
1382             if not takes_self:
1383                 out_java_struct += (
1384                         "\tpublic static constructor_" + meth_n + "(")
1385             else:
1386                 out_java_struct += ("\tpublic " + meth_n + "(")
1387             for idx, arg in enumerate(argument_types):
1388                 if idx != 0:
1389                     if not takes_self or idx > 1:
1390                         out_java_struct += (", ")
1391                 elif takes_self:
1392                     continue
1393                 if arg.java_ty != "void":
1394                     if arg.arg_name in default_constructor_args:
1395                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1396                             if explode_idx != 0:
1397                                 out_java_struct += (", ")
1398                             out_java_struct += arg.arg_name + "_" + explode_arg.arg_name + ": " + explode_arg.java_hu_ty
1399                     else:
1400                         out_java_struct += arg.arg_name + ": " + arg.java_hu_ty
1401
1402         out_c += (") {\n")
1403         if out_java_struct is not None:
1404             out_java_struct += "): " + return_type_info.java_hu_ty + " {\n"
1405         for info in argument_types:
1406             if info.arg_conv is not None:
1407                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1408         if return_type_info.ret_conv is not None:
1409             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1410         elif return_type_info.c_ty != "void":
1411             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1412         else:
1413             out_c += ("\t")
1414         if c_call_string is None:
1415             out_c += (method_name + "(")
1416         else:
1417             out_c += (c_call_string)
1418         for idx, info in enumerate(argument_types):
1419             if info.arg_conv_name is not None:
1420                 if idx != 0:
1421                     out_c += (", ")
1422                 elif c_call_string is not None:
1423                     continue
1424                 out_c += (info.arg_conv_name)
1425         out_c += (")")
1426         if return_type_info.ret_conv is not None:
1427             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1428         else:
1429             out_c += (";")
1430         for info in argument_types:
1431             if info.arg_conv_cleanup is not None:
1432                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1433         if return_type_info.ret_conv is not None:
1434             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1435         elif return_type_info.c_ty != "void":
1436             out_c += ("\n\treturn ret_val;")
1437         out_c += ("\n}\n\n")
1438
1439         if args_known:
1440             out_java_struct += ("\t\t")
1441             if return_type_info.java_ty != "void":
1442                 out_java_struct += "const ret: " + return_type_info.java_ty + " = "
1443             out_java_struct += ("bindings." + method_name + "(")
1444             for idx, info in enumerate(argument_types):
1445                 if idx != 0:
1446                     out_java_struct += (", ")
1447                 if idx == 0 and takes_self:
1448                     out_java_struct += ("this.ptr")
1449                 elif info.arg_name in default_constructor_args:
1450                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1451                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1452                         if explode_idx != 0:
1453                             out_java_struct += (", ")
1454                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1455                         if explode_arg.from_hu_conv is not None:
1456                             out_java_struct += (
1457                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1458                         else:
1459                             out_java_struct += (expl_arg_name)
1460                     out_java_struct += (")")
1461                 elif info.from_hu_conv is not None:
1462                     out_java_struct += (info.from_hu_conv[0])
1463                 else:
1464                     out_java_struct += (info.arg_name)
1465             out_java_struct += (");\n")
1466             if return_type_info.to_hu_conv is not None:
1467                 if not takes_self:
1468                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1469                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1470                 else:
1471                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1472
1473             for idx, info in enumerate(argument_types):
1474                 if idx == 0 and takes_self:
1475                     pass
1476                 elif info.arg_name in default_constructor_args:
1477                     for explode_arg in default_constructor_args[info.arg_name]:
1478                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1479                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1480                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1481                                                                                              expl_arg_name).replace(
1482                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1483                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1484                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1485                         out_java_struct += (
1486                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1487                     else:
1488                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1489
1490             if return_type_info.to_hu_conv_name is not None:
1491                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1492             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1493                 out_java_struct += ("\t\treturn ret;\n")
1494             out_java_struct += ("\t}\n\n")
1495
1496         return (out_java, out_c, out_java_struct)
1497
1498     def cleanup(self):
1499         for struct in self.struct_file_suffixes:
1500             with open(self.outdir + "/structs/" + struct + self.file_ext, "a") as src:
1501                 src.write(self.struct_file_suffixes[struct])
1502
1503         with open(self.outdir + "/bindings.mts", "a") as bindings:
1504             bindings.write("""
1505
1506 js_invoke = function(obj_ptr: number, fn_id: number, arg1: bigint|number, arg2: bigint|number, arg3: bigint|number, arg4: bigint|number, arg5: bigint|number, arg6: bigint|number, arg7: bigint|number, arg8: bigint|number, arg9: bigint|number, arg10: bigint|number) {
1507         const weak: WeakRef<object> = js_objs[obj_ptr];
1508         if (weak == null || weak == undefined) {
1509                 console.error("Got function call on unknown/free'd JS object!");
1510                 throw new Error("Got function call on unknown/free'd JS object!");
1511         }
1512         const obj: object = weak.deref();
1513         if (obj == null || obj == undefined) {
1514                 console.error("Got function call on GC'd JS object!");
1515                 throw new Error("Got function call on GC'd JS object!");
1516         }
1517         var fn;
1518 """)
1519             bindings.write("\tswitch (fn_id) {\n")
1520             for f in self.function_ptrs:
1521                 bindings.write(f"\t\tcase {str(f)}: fn = Object.getOwnPropertyDescriptor(obj, \"{self.function_ptrs[f][1]}\"); break;\n")
1522
1523             bindings.write("""\t\tdefault:
1524                         console.error("Got unknown function call from C!");
1525                         throw new Error("Got unknown function call from C!");
1526         }
1527         if (fn == null || fn == undefined) {
1528                 console.error("Got function call on incorrect JS object!");
1529                 throw new Error("Got function call on incorrect JS object!");
1530         }
1531         const ret = fn.value.bind(obj)(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10);
1532         if (ret === undefined || ret === null) return BigInt(0);
1533         return BigInt(ret);
1534 }""")