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