_ 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", "bbuuuu", "bbbuuu", "bbbbuu",
 129         "bbbbbb", "ubuubu", "ubuuuu", "ubbuuu", "uubuuu", "uububu"];
 130
 131 /* @internal */
 132 export async function initializeWasmFromUint8Array(wasmBinary: Uint8Array) {
 133         for (const fn of fn_list) { imports.env["js_invoke_function_" + fn] = js_invoke; }
 134         const { instance: wasmInstance } = await WebAssembly.instantiate(wasmBinary, imports);
 135         await finishInitializeWasm(wasmInstance);
 136 }
 137
 138 /* @internal */
 139 export async function initializeWasmFetch(uri: string) {
 140         for (const fn of fn_list) { imports.env["js_invoke_function_" + fn] = js_invoke; }
 141         const stream = fetch(uri);
 142         const { instance: wasmInstance } = await WebAssembly.instantiateStreaming(stream, imports);
 143         await finishInitializeWasm(wasmInstance);
 144 }"""
 145
 146         self.bindings_header += """
 147 // WASM CODEC
 148
 149 /* @internal */
 150 export function uint5ArrToBytes(inputArray: Array<UInt5>): Uint8Array {
 151         const arr = new Uint8Array(inputArray.length);
 152         for (var i = 0; i < inputArray.length; i++) {
 153                 arr[i] = inputArray[i].getVal();
 154         }
 155         return arr;
 156 }
 157
 158 /* @internal */
 159 export function WitnessVersionArrToBytes(inputArray: Array<WitnessVersion>): Uint8Array {
 160         const arr = new Uint8Array(inputArray.length);
 161         for (var i = 0; i < inputArray.length; i++) {
 162                 arr[i] = inputArray[i].getVal();
 163         }
 164         return arr;
 165 }
 166
 167
 168
 169 /* @internal */
 170 export function encodeUint8Array (inputArray: Uint8Array): number {
 171         const cArrayPointer = wasm.TS_malloc(inputArray.length + 8);
 172         const arrayLengthView = new BigUint64Array(wasm.memory.buffer, cArrayPointer, 1);
 173         arrayLengthView[0] = BigInt(inputArray.length);
 174         const arrayMemoryView = new Uint8Array(wasm.memory.buffer, cArrayPointer + 8, inputArray.length);
 175         arrayMemoryView.set(inputArray);
 176         return cArrayPointer;
 177 }
 178 /* @internal */
 179 export function encodeUint32Array (inputArray: Uint32Array|Array<number>): number {
 180         const cArrayPointer = wasm.TS_malloc((inputArray.length + 2) * 4);
 181         const arrayLengthView = new BigUint64Array(wasm.memory.buffer, cArrayPointer, 1);
 182         arrayLengthView[0] = BigInt(inputArray.length);
 183         const arrayMemoryView = new Uint32Array(wasm.memory.buffer, cArrayPointer + 8, inputArray.length);
 184         arrayMemoryView.set(inputArray);
 185         return cArrayPointer;
 186 }
 187 /* @internal */
 188 export function encodeUint64Array (inputArray: BigUint64Array|Array<bigint>): number {
 189         const cArrayPointer = wasm.TS_malloc((inputArray.length + 1) * 8);
 190         const arrayMemoryView = new BigUint64Array(wasm.memory.buffer, cArrayPointer, 1);
 191         arrayMemoryView.set(inputArray, 1);
 192         arrayMemoryView[0] = BigInt(inputArray.length);
 193         return cArrayPointer;
 194 }
 195
 196 /* @internal */
 197 export function check_arr_len(arr: Uint8Array, len: number): Uint8Array {
 198         if (arr.length != len) { throw new Error("Expected array of length " + len + " got " + arr.length); }
 199         return arr;
 200 }
 201
 202 /* @internal */
 203 export function getArrayLength(arrayPointer: number): number {
 204         const arraySizeViewer = new BigUint64Array(wasm.memory.buffer, arrayPointer, 1);
 205         const len = arraySizeViewer[0];
 206         if (len >= (2n ** 32n)) throw new Error("Bogus Array Size");
 207         return Number(len % (2n ** 32n));
 208 }
 209 /* @internal */
 210 export function decodeUint8Array (arrayPointer: number, free = true): Uint8Array {
 211         const arraySize = getArrayLength(arrayPointer);
 212         const actualArrayViewer = new Uint8Array(wasm.memory.buffer, arrayPointer + 8, arraySize);
 213         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 214         // will free the underlying memory when it becomes unreachable instead of copying here.
 215         // Note that doing so may have edge-case interactions with memory resizing (invalidating the buffer).
 216         const actualArray = actualArrayViewer.slice(0, arraySize);
 217         if (free) {
 218                 wasm.TS_free(arrayPointer);
 219         }
 220         return actualArray;
 221 }
 222 const decodeUint32Array = (arrayPointer: number, free = true) => {
 223         const arraySize = getArrayLength(arrayPointer);
 224         const actualArrayViewer = new Uint32Array(
 225                 wasm.memory.buffer, // value
 226                 arrayPointer + 8, // offset (ignoring length bytes)
 227                 arraySize // uint32 count
 228         );
 229         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 230         // will free the underlying memory when it becomes unreachable instead of copying here.
 231         const actualArray = actualArrayViewer.slice(0, arraySize);
 232         if (free) {
 233                 wasm.TS_free(arrayPointer);
 234         }
 235         return actualArray;
 236 }
 237 /* @internal */
 238 export function decodeUint64Array (arrayPointer: number, free = true): bigint[] {
 239         const arraySize = getArrayLength(arrayPointer);
 240         const actualArrayViewer = new BigUint64Array(
 241                 wasm.memory.buffer, // value
 242                 arrayPointer + 8, // offset (ignoring length bytes)
 243                 arraySize // uint32 count
 244         );
 245         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 246         // will free the underlying memory when it becomes unreachable instead of copying here.
 247         const actualArray = new Array(arraySize);
 248         for (var i = 0; i < arraySize; i++) actualArray[i] = actualArrayViewer[i];
 249         if (free) {
 250                 wasm.TS_free(arrayPointer);
 251         }
 252         return actualArray;
 253 }
 254
 255 export function freeWasmMemory(pointer: number) { wasm.TS_free(pointer); }
 256
 257 /* @internal */
 258 export function getU64ArrayElem(arrayPointer: number, idx: number): bigint {
 259         const actualArrayViewer = new BigUint64Array(wasm.memory.buffer, arrayPointer + 8, idx + 1);
 260         return actualArrayViewer[idx];
 261 }
 262
 263 /* @internal */
 264 export function getU32ArrayElem(arrayPointer: number, idx: number): number {
 265         const actualArrayViewer = new Uint32Array(wasm.memory.buffer, arrayPointer + 8, idx + 1);
 266         return actualArrayViewer[idx];
 267 }
 268
 269 /* @internal */
 270 export function getU8ArrayElem(arrayPointer: number, idx: number): number {
 271         const actualArrayViewer = new Uint8Array(wasm.memory.buffer, arrayPointer + 8, idx + 1);
 272         return actualArrayViewer[idx];
 273 }
 274
 275
 276 /* @internal */
 277 export function encodeString(str: string): number {
 278         const charArray = new TextEncoder().encode(str);
 279         return encodeUint8Array(charArray);
 280 }
 281
 282 /* @internal */
 283 export function decodeString(stringPointer: number, free = true): string {
 284         const arraySize = getArrayLength(stringPointer);
 285         const memoryView = new Uint8Array(wasm.memory.buffer, stringPointer + 8, arraySize);
 286         const result = new TextDecoder("utf-8").decode(memoryView);
 287
 288         if (free) {
 289                 wasm.TS_free(stringPointer);
 290         }
 291
 292         return result;
 293 }
 294 """
 295         if DEBUG:
 296             self.bindings_header += """
 297 /* @internal */
 298 export function getRemainingAllocationCount(): number {
 299         return wasm.TS_allocs_remaining();
 300 }
 301 /* @internal */
 302 export function debugPrintRemainingAllocs() {
 303         wasm.TS_print_leaks();
 304 }
 305 """
 306         else:
 307             self.bindings_header += "\n/* @internal */ export function getRemainingAllocationCount(): number { return 0; }\n"
 308             self.bindings_header += "/* @internal */ export function debugPrintRemainingAllocs() { }\n"
 309
 310         with open(outdir + "/index.mts", 'a') as index:
 311             index.write("""import { initializeWasmFetch, initializeWasmFromUint8Array } from './bindings.mjs';
 312 /** Initializes the WASM backend by calling `fetch()` on the given URI - Browser only */
 313 export async function initializeWasmWebFetch(uri: string) {
 314         await initializeWasmFetch(uri);
 315 }
 316 /** Initializes the WASM backend given a Uint8Array of the .wasm binary file - Browser or Node.JS */
 317 export async function initializeWasmFromBinary(bin: Uint8Array) {
 318         await initializeWasmFromUint8Array(bin);
 319 }
 320
 321 """)
 322
 323         self.bindings_version_file = """export function get_ldk_java_bindings_version(): String {
 324         return "<git_version_ldk_garbagecollected>";
 325 }"""
 326
 327         self.bindings_footer = ""
 328
 329         self.common_base = """
 330 function freer(f: () => void) { f() }
 331 const finalizer = new FinalizationRegistry(freer);
 332 function get_freeer(ptr: bigint, free_fn: (ptr: bigint) => void) {
 333         return () => {
 334                 free_fn(ptr);
 335         }
 336 }
 337
 338 export class CommonBase {
 339         protected ptr: bigint;
 340         protected ptrs_to: object[] = [];
 341         protected constructor(ptr: bigint, free_fn: (ptr: bigint) => void) {
 342                 this.ptr = ptr;
 343                 if (ptr != 0n){
 344                         finalizer.register(this, get_freeer(ptr, free_fn), this);
 345                 }
 346         }
 347         // In Java, protected means "any subclass can access fields on any other subclass'"
 348         // In TypeScript, protected means "any subclass can access parent fields on instances of itself"
 349         // To work around this, we add accessors for other instances' protected fields here.
 350         protected static add_ref_from(holder: CommonBase, referent: object) {
 351                 if (holder !== null) { holder.ptrs_to.push(referent); }
 352         }
 353         protected static get_ptr_of(o: CommonBase) {
 354                 return o.ptr;
 355         }
 356         protected static set_null_skip_free(o: CommonBase) {
 357                 o.ptr = 0n;
 358                 // @ts-ignore TypeScript is wrong about the returnvalue of unregister here!
 359                 const did_unregister: boolean = finalizer.unregister(o);
 360                 if (!did_unregister)
 361                         throw new Error("FinalizationRegistry unregister should always unregister unless you double-free'd");
 362         }
 363 }
 364
 365 export class UInt5 {
 366         public constructor(private val: number) {
 367                 if (val > 32 || val < 0) throw new Error("UInt5 value is out of range");
 368         }
 369         public getVal(): number {
 370                 return this.val;
 371         }
 372 }
 373
 374 export class WitnessVersion {
 375         public constructor(private val: number) {
 376                 if (val > 16 || val < 0) throw new Error("WitnessVersion value is out of range");
 377         }
 378         public getVal(): number {
 379                 return this.val;
 380         }
 381 }
 382
 383 export class UnqualifiedError {
 384         public constructor(val: number) {}
 385 }
 386 """
 387
 388         self.txout_defn = """export class TxOut extends CommonBase {
 389         /** The script_pubkey in this output */
 390         public script_pubkey: Uint8Array;
 391         /** The value, in satoshis, of this output */
 392         public value: bigint;
 393
 394         /* @internal */
 395         public constructor(_dummy: object, ptr: bigint) {
 396                 super(ptr, bindings.TxOut_free);
 397                 this.script_pubkey = bindings.decodeUint8Array(bindings.TxOut_get_script_pubkey(ptr));
 398                 this.value = bindings.TxOut_get_value(ptr);
 399         }
 400         public static constructor_new(value: bigint, script_pubkey: Uint8Array): TxOut {
 401                 return new TxOut(null, bindings.TxOut_new(bindings.encodeUint8Array(script_pubkey), value));
 402         }
 403 }"""
 404         self.obj_defined(["TxOut"], "structs")
 405
 406         self.scalar_defn = """export class BigEndianScalar extends CommonBase {
 407         /** The bytes of the scalar value, in big endian */
 408         public scalar_bytes: Uint8Array;
 409
 410         /* @internal */
 411         public constructor(_dummy: object, ptr: bigint) {
 412                 super(ptr, bindings.BigEndianScalar_free);
 413                 this.scalar_bytes = bindings.decodeUint8Array(bindings.BigEndianScalar_get_bytes(ptr));
 414         }
 415         public static constructor_new(scalar_bytes: Uint8Array): BigEndianScalar {
 416                 return new BigEndianScalar(null, bindings.BigEndianScalar_new(bindings.encodeUint8Array(scalar_bytes)));
 417         }
 418 }"""
 419         self.obj_defined(["BigEndianScalar"], "structs")
 420
 421         self.c_file_pfx = """#include "js-wasm.h"
 422 #include <stdatomic.h>
 423 #include <lightning.h>
 424
 425 // These should be provided...somehow...
 426 void *memset(void *s, int c, size_t n);
 427 void *memcpy(void *dest, const void *src, size_t n);
 428 int memcmp(const void *s1, const void *s2, size_t n);
 429
 430 extern void __attribute__((noreturn)) abort(void);
 431 static inline void assert(bool expression) {
 432         if (!expression) { abort(); }
 433 }
 434
 435 uint32_t __attribute__((export_name("test_bigint_pass_deadbeef0badf00d"))) test_bigint_pass_deadbeef0badf00d(uint64_t val) {
 436         return val == 0xdeadbeef0badf00dULL;
 437 }
 438
 439 """
 440
 441         if not DEBUG:
 442             self.c_file_pfx += """
 443 void *malloc(size_t size);
 444 void free(void *ptr);
 445
 446 #define MALLOC(a, _) malloc(a)
 447 #define do_MALLOC(a, _b, _c) malloc(a)
 448 #define FREE(p) if ((unsigned long)(p) > 4096) { free(p); }
 449 #define DO_ASSERT(a) (void)(a)
 450 #define CHECK(a)
 451 #define CHECK_ACCESS(p)
 452 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v)
 453 """
 454         else:
 455             self.c_file_pfx += """
 456 extern int snprintf(char *str, size_t size, const char *format, ...);
 457 typedef int32_t ssize_t;
 458 ssize_t write(int fd, const void *buf, size_t count);
 459 #define DEBUG_PRINT(...) do { \\
 460         char debug_str[1024]; \\
 461         int s_len = snprintf(debug_str, 1023, __VA_ARGS__); \\
 462         write(2, debug_str, s_len); \\
 463 } while (0);
 464
 465 // Always run a, then assert it is true:
 466 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 467 // Assert a is true or do nothing
 468 #define CHECK(a) DO_ASSERT(a)
 469
 470 // Running a leak check across all the allocations and frees of the JDK is a mess,
 471 // so instead we implement our own naive leak checker here, relying on the -wrap
 472 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 473 // and free'd in Rust or C across the generated bindings shared library.
 474
 475 #define BT_MAX 128
 476 typedef struct allocation {
 477         struct allocation* next;
 478         void* ptr;
 479         const char* struct_name;
 480         int lineno;
 481 } allocation;
 482 static allocation* allocation_ll = NULL;
 483 static allocation* freed_ll = NULL;
 484
 485 extern void* __real_malloc(size_t len);
 486 extern void* __real_calloc(size_t nmemb, size_t len);
 487 extern void* __real_aligned_alloc(size_t alignment, size_t size);
 488 static void new_allocation(void* res, const char* struct_name, int lineno) {
 489         allocation* new_alloc = __real_malloc(sizeof(allocation));
 490         new_alloc->ptr = res;
 491         new_alloc->struct_name = struct_name;
 492         new_alloc->next = allocation_ll;
 493         new_alloc->lineno = lineno;
 494         allocation_ll = new_alloc;
 495 }
 496 static void* do_MALLOC(size_t len, const char* struct_name, int lineno) {
 497         void* res = __real_malloc(len);
 498         new_allocation(res, struct_name, lineno);
 499         return res;
 500 }
 501 #define MALLOC(len, struct_name) do_MALLOC(len, struct_name, __LINE__)
 502
 503 void __real_free(void* ptr);
 504 static void alloc_freed(void* ptr, int lineno) {
 505         allocation* p = NULL;
 506         allocation* it = allocation_ll;
 507         while (it->ptr != ptr) {
 508                 p = it; it = it->next;
 509                 if (it == NULL) {
 510                         p = NULL;
 511                         it = freed_ll;
 512                         while (it && it->ptr != ptr) { p = it; it = it->next; }
 513                         if (it == NULL) {
 514                                 DEBUG_PRINT("Tried to free unknown pointer %p at line %d.\\n", ptr, lineno);
 515                         } else {
 516                                 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);
 517                         }
 518                         abort();
 519                 }
 520         }
 521         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 522         DO_ASSERT(it->ptr == ptr);
 523         it->next = freed_ll;
 524         freed_ll = it;
 525 }
 526 static void do_FREE(void* ptr, int lineno) {
 527         if ((unsigned long)ptr <= 4096) return; // Rust loves to create pointers to the NULL page for dummys
 528         alloc_freed(ptr, lineno);
 529         __real_free(ptr);
 530 }
 531 #define FREE(ptr) do_FREE(ptr, __LINE__)
 532
 533 static void CHECK_ACCESS(const void* ptr) {
 534         allocation* it = allocation_ll;
 535         while (it->ptr != ptr) {
 536                 it = it->next;
 537                 if (it == NULL) {
 538                         return; // addrsan should catch malloc-unknown and print more info than we have
 539                 }
 540         }
 541 }
 542 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v) \\
 543         if (v.is_owned && v.inner != NULL) { \\
 544                 const void *p = __unmangle_inner_ptr(v.inner); \\
 545                 if (p != NULL) { \\
 546                         CHECK_ACCESS(p); \\
 547                 } \\
 548         }
 549
 550 void* __wrap_malloc(size_t len) {
 551         void* res = __real_malloc(len);
 552         new_allocation(res, "malloc call", 0);
 553         return res;
 554 }
 555 void* __wrap_calloc(size_t nmemb, size_t len) {
 556         void* res = __real_calloc(nmemb, len);
 557         new_allocation(res, "calloc call", 0);
 558         return res;
 559 }
 560 void* __wrap_aligned_alloc(size_t alignment, size_t size) {
 561         void* res = __real_aligned_alloc(alignment, size);
 562         new_allocation(res, "aligned_alloc call", 0);
 563         return res;
 564 }
 565 void __wrap_free(void* ptr) {
 566         if (ptr == NULL) return;
 567         alloc_freed(ptr, 0);
 568         __real_free(ptr);
 569 }
 570
 571 void* __real_realloc(void* ptr, size_t newlen);
 572 void* __wrap_realloc(void* ptr, size_t len) {
 573         if (ptr != NULL) alloc_freed(ptr, 0);
 574         void* res = __real_realloc(ptr, len);
 575         new_allocation(res, "realloc call", 0);
 576         return res;
 577 }
 578 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 579         // Rust doesn't seem to use reallocarray currently
 580         DO_ASSERT(false);
 581 }
 582
 583 uint32_t __attribute__((export_name("TS_allocs_remaining"))) allocs_remaining() {
 584         uint32_t count = 0;
 585         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 586                 count++;
 587         }
 588         return count;
 589 }
 590 void __attribute__((export_name("TS_print_leaks"))) print_leaks() {
 591         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 592                 DEBUG_PRINT("%s %p remains. Allocated on line %d\\n", a->struct_name, a->ptr, a->lineno);
 593         }
 594 }
 595 """
 596         self.c_file_pfx = self.c_file_pfx + """
 597 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 598 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 599 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 600 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 601
 602 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 603
 604 #define DECL_ARR_TYPE(ty, name) \\
 605         struct name##array { \\
 606                 uint64_t arr_len; /* uint32_t would suffice but we want to align uint64_ts as well */ \\
 607                 ty elems[]; \\
 608         }; \\
 609         typedef struct name##array * name##Array; \\
 610         static inline name##Array init_##name##Array(size_t arr_len, int lineno) { \\
 611                 name##Array arr = (name##Array)do_MALLOC(arr_len * sizeof(ty) + sizeof(uint64_t), #name" array init", lineno); \\
 612                 arr->arr_len = arr_len; \\
 613                 return arr; \\
 614         }
 615
 616 DECL_ARR_TYPE(int64_t, int64_t);
 617 DECL_ARR_TYPE(uint64_t, uint64_t);
 618 DECL_ARR_TYPE(int8_t, int8_t);
 619 DECL_ARR_TYPE(uint32_t, uint32_t);
 620 DECL_ARR_TYPE(void*, ptr);
 621 DECL_ARR_TYPE(char, char);
 622 typedef charArray jstring;
 623
 624 static inline jstring str_ref_to_ts(const char* chars, size_t len) {
 625         charArray arr = init_charArray(len, __LINE__);
 626         memcpy(arr->elems, chars, len);
 627         return arr;
 628 }
 629 static inline LDKStr str_ref_to_owned_c(const jstring str) {
 630         char* newchars = MALLOC(str->arr_len + 1, "String chars");
 631         memcpy(newchars, str->elems, str->arr_len);
 632         newchars[str->arr_len] = 0;
 633         LDKStr res = {
 634                 .chars = newchars,
 635                 .len = str->arr_len,
 636                 .chars_is_owned = true
 637         };
 638         return res;
 639 }
 640
 641 typedef bool jboolean;
 642
 643 uint32_t __attribute__((export_name("TS_malloc"))) TS_malloc(uint32_t size) {
 644         return (uint32_t)MALLOC(size, "JS-Called malloc");
 645 }
 646 void __attribute__((export_name("TS_free"))) TS_free(uint32_t ptr) {
 647         FREE((void*)ptr);
 648 }
 649
 650 jstring __attribute__((export_name("TS_get_ldk_c_bindings_version"))) TS_get_ldk_c_bindings_version() {
 651         const char *res = check_get_ldk_bindings_version();
 652         if (res == NULL) return NULL;
 653         return str_ref_to_ts(res, strlen(res));
 654 }
 655 jstring __attribute__((export_name("TS_get_ldk_version"))) get_ldk_version() {
 656         const char *res = check_get_ldk_version();
 657         if (res == NULL) return NULL;
 658         return str_ref_to_ts(res, strlen(res));
 659 }
 660 #include "version.c"
 661 """
 662
 663         self.c_version_file = """jstring __attribute__((export_name("TS_get_lib_version_string"))) TS_get_lib_version_string() {
 664         return str_ref_to_ts("<git_version_ldk_garbagecollected>", strlen("<git_version_ldk_garbagecollected>"));
 665 }"""
 666
 667         self.hu_struct_file_prefix = """
 668 import { CommonBase, UInt5, WitnessVersion, UnqualifiedError } from './CommonBase.mjs';
 669 import * as bindings from '../bindings.mjs'
 670
 671 """
 672         self.util_fn_pfx = self.hu_struct_file_prefix + "\nexport class UtilMethods extends CommonBase {\n"
 673         self.util_fn_sfx = "}"
 674         self.c_fn_ty_pfx = ""
 675         self.file_ext = ".mts"
 676         self.ptr_c_ty = "uint64_t"
 677         self.ptr_native_ty = "bigint"
 678         self.usize_c_ty = "uint32_t"
 679         self.usize_native_ty = "number"
 680         self.native_zero_ptr = "0n"
 681         self.result_c_ty = "uint32_t"
 682         self.ptr_arr = "ptrArray"
 683         self.is_arr_some_check = ("", " != 0")
 684         self.get_native_arr_len_call = ("", "->arr_len")
 685
 686     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 687         return None
 688     def create_native_arr_call(self, arr_len, ty_info):
 689         if ty_info.c_ty == "ptrArray":
 690             assert ty_info.rust_obj == "LDKCVec_u5Z" or (ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"))
 691         return "init_" + ty_info.c_ty + "(" + arr_len + ", __LINE__)"
 692     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 693         if ty_info.c_ty == "int8_tArray":
 694             return ("memcpy(" + arr_name + "->elems, ", ", " + arr_len + ")")
 695         else:
 696             assert False
 697     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 698         if ty_info.c_ty == "int8_tArray":
 699             if copy:
 700                 return "memcpy(" + dest_name + ", " + arr_name + "->elems, " + arr_len + "); FREE(" + arr_name + ")"
 701         assert not copy
 702         if ty_info.c_ty == "ptrArray":
 703             return "(void*) " + arr_name + "->elems"
 704         else:
 705             return arr_name + "->elems"
 706     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 707         assert False # Only called if above is None
 708     def get_native_arr_ptr_call(self, ty_info):
 709         if ty_info.subty is not None:
 710             return "(" + ty_info.subty.c_ty + "*)(((uint8_t*)", ") + 8)"
 711         return "(" + ty_info.c_ty + "*)(((uint8_t*)", ") + 8)"
 712     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 713         return None
 714     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 715         if ty_info.c_ty == "int8_tArray":
 716             return "FREE(" + arr_name + ");"
 717         else:
 718             return "FREE(" + arr_name + ")"
 719
 720     def map_hu_array_elems(self, arr_name, conv_name, arr_ty, elem_ty):
 721         if elem_ty.rust_obj == "LDKu5":
 722             return arr_name + " != null ? bindings.uint5ArrToBytes(" + arr_name + ") : null"
 723         assert elem_ty.c_ty == "uint64_t" or elem_ty.c_ty.endswith("Array")
 724         return arr_name + " != null ? " + arr_name + ".map(" + conv_name + " => " + elem_ty.from_hu_conv[0] + ") : null"
 725
 726     def str_ref_to_native_call(self, var_name, str_len):
 727         return "str_ref_to_ts(" + var_name + ", " + str_len + ")"
 728     def str_ref_to_c_call(self, var_name):
 729         return "str_ref_to_owned_c(" + var_name + ")"
 730     def str_to_hu_conv(self, var_name):
 731         return "const " + var_name + "_conv: string = bindings.decodeString(" + var_name + ");"
 732     def str_from_hu_conv(self, var_name):
 733         return ("bindings.encodeString(" + var_name + ")", "")
 734
 735     def c_fn_name_define_pfx(self, fn_name, have_args):
 736         return " __attribute__((export_name(\"TS_" + fn_name + "\"))) TS_" + fn_name + "("
 737
 738     def init_str(self):
 739         return ""
 740
 741     def get_java_arr_len(self, arr_name):
 742         return "bindings.getArrayLength(" + arr_name + ")"
 743     def get_java_arr_elem(self, elem_ty, arr_name, idx):
 744         if elem_ty.c_ty.endswith("Array") or elem_ty.c_ty == "uintptr_t":
 745             return "bindings.getU32ArrayElem(" + arr_name + ", " + idx + ")"
 746         elif elem_ty.c_ty == "uint64_t":
 747             return "bindings.getU64ArrayElem(" + arr_name + ", " + idx + ")"
 748         elif elem_ty.rust_obj == "LDKu5":
 749             return "bindings.getU8ArrayElem(" + arr_name + ", " + idx + ")"
 750         else:
 751             assert False
 752     def constr_hu_array(self, ty_info, arr_len):
 753         return "new Array(" + arr_len + ").fill(null)"
 754     def cleanup_converted_native_array(self, ty_info, arr_name):
 755         return "bindings.freeWasmMemory(" + arr_name + ")"
 756
 757     def primitive_arr_from_hu(self, mapped_ty, fixed_len, arr_name):
 758         inner = arr_name
 759         if fixed_len is not None:
 760             assert mapped_ty.c_ty == "int8_t"
 761             inner = "bindings.check_arr_len(" + arr_name + ", " + fixed_len + ")"
 762         if mapped_ty.c_ty.endswith("Array"):
 763             return ("bindings.encodeUint32Array(" + inner + ")", "")
 764         elif mapped_ty.c_ty == "uint8_t" or mapped_ty.c_ty == "int8_t":
 765             return ("bindings.encodeUint8Array(" + inner + ")", "")
 766         elif mapped_ty.c_ty == "uint32_t":
 767             return ("bindings.encodeUint32Array(" + inner + ")", "")
 768         elif mapped_ty.c_ty == "int64_t" or mapped_ty.c_ty == "uint64_t":
 769             return ("bindings.encodeUint64Array(" + inner + ")", "")
 770         else:
 771             print(mapped_ty.c_ty)
 772             assert False
 773
 774     def primitive_arr_to_hu(self, mapped_ty, fixed_len, arr_name, conv_name):
 775         if mapped_ty.c_ty == "uint8_t" or mapped_ty.c_ty == "int8_t":
 776             return "const " + conv_name + ": Uint8Array = bindings.decodeUint8Array(" + arr_name + ");"
 777         elif mapped_ty.c_ty == "uint64_t" or mapped_ty.c_ty == "int64_t":
 778             return "const " + conv_name + ": bigint[] = bindings.decodeUint64Array(" + arr_name + ");"
 779         else:
 780             assert False
 781
 782     def var_decl_statement(self, ty_string, var_name, statement):
 783         return "const " + var_name + ": " + ty_string + " = " + statement
 784
 785     def java_arr_ty_str(self, elem_ty_str):
 786         return "number"
 787
 788     def for_n_in_range(self, n, minimum, maximum):
 789         return "for (var " + n + " = " + minimum + "; " + n + " < " + maximum + "; " + n + "++) {"
 790     def for_n_in_arr(self, n, arr_name, arr_elem_ty):
 791         return (arr_name + ".forEach((" + n + ": " + arr_elem_ty.java_hu_ty + ") => { ", " })")
 792
 793     def get_ptr(self, var):
 794         return "CommonBase.get_ptr_of(" + var + ")"
 795     def set_null_skip_free(self, var):
 796         return "CommonBase.set_null_skip_free(" + var + ");"
 797
 798     def add_ref(self, holder, referent):
 799         return "CommonBase.add_ref_from(" + holder + ", " + referent + ")"
 800
 801     def obj_defined(self, struct_names, folder):
 802         with open(self.outdir + "/index.mts", 'a') as index:
 803             index.write(f"export * from './{folder}/{struct_names[0]}.mjs';\n")
 804         with open(self.outdir + "/imports.mts.part", 'a') as imports:
 805             imports.write(f"import {{ {', '.join(struct_names)} }} from '../{folder}/{struct_names[0]}.mjs';\n")
 806
 807     def fully_qualified_hu_ty_path(self, ty):
 808         return ty.java_hu_ty
 809
 810     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 811         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_js(int32_t ord) {\n"
 812         out_c = out_c + "\tswitch (ord) {\n"
 813         ord_v = 0
 814
 815         out_typescript_enum_fields = ""
 816
 817         for var, var_docs in variants:
 818             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 819             ord_v = ord_v + 1
 820             if var_docs is not None:
 821                 var_docs_repld = var_docs.replace("\n", "\n\t")
 822                 out_typescript_enum_fields += f"/**\n\t * {var_docs_repld}\n\t */\n"
 823             out_typescript_enum_fields += f"\t{var},\n\t"
 824         out_c = out_c + "\t}\n"
 825         out_c = out_c + "\tabort();\n"
 826         out_c = out_c + "}\n"
 827
 828         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_js(LDK" + struct_name + " val) {\n"
 829         out_c = out_c + "\tswitch (val) {\n"
 830         ord_v = 0
 831         for var, _ in variants:
 832             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 833             ord_v = ord_v + 1
 834         out_c = out_c + "\t\tdefault: abort();\n"
 835         out_c = out_c + "\t}\n"
 836         out_c = out_c + "}\n"
 837
 838         # Note that this is *not* marked /* @internal */ as we re-expose it directly in enums/
 839         enum_comment_formatted = enum_doc_comment.replace("\n", "\n * ")
 840         out_typescript = f"""
 841 /**
 842  * {enum_comment_formatted}
 843  */
 844 export enum {struct_name} {{
 845         {out_typescript_enum_fields}
 846 }}
 847 """
 848         out_typescript_enum = f"export {{ {struct_name} }} from \"../bindings.mjs\";"
 849         self.obj_defined([struct_name], "enums")
 850         return (out_c, out_typescript_enum, out_typescript)
 851
 852     def c_unitary_enum_to_native_call(self, ty_info):
 853         return (ty_info.rust_obj + "_to_js(", ")")
 854     def native_unitary_enum_to_c_call(self, ty_info):
 855         return (ty_info.rust_obj + "_from_js(", ")")
 856
 857     def native_c_map_trait(self, struct_name, field_var_conversions, flattened_field_var_conversions, field_function_lines, trait_doc_comment):
 858         out_typescript_bindings = ""
 859         super_instantiator = ""
 860         bindings_instantiator = ""
 861         pointer_to_adder = ""
 862         impl_constructor_arguments = ""
 863         for var in flattened_field_var_conversions:
 864             if isinstance(var, ConvInfo):
 865                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 866                 super_instantiator += first_to_lower(var.arg_name) + ", "
 867                 if var.from_hu_conv is not None:
 868                     bindings_instantiator += ", " + var.from_hu_conv[0]
 869                     if var.from_hu_conv[1] != "":
 870                         pointer_to_adder += "\t\t\t" + var.from_hu_conv[1] + ";\n"
 871                 else:
 872                     bindings_instantiator += ", " + first_to_lower(var.arg_name)
 873             else:
 874                 bindings_instantiator += ", " + first_to_lower(var[1]) + ".bindings_instance"
 875                 super_instantiator += first_to_lower(var[1]) + "_impl, "
 876                 pointer_to_adder += "\t\timpl_holder.held.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 877                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}Interface"
 878
 879         super_constructor_statements = ""
 880         trait_constructor_arguments = ""
 881         for var in field_var_conversions:
 882             if isinstance(var, ConvInfo):
 883                 trait_constructor_arguments += ", " + var.arg_name
 884             else:
 885                 super_constructor_statements += "\t\tconst " + first_to_lower(var[1]) + " = " + var[1] + ".new_impl(" + super_instantiator + ");\n"
 886                 trait_constructor_arguments += ", " + first_to_lower(var[1]) + ".bindings_instance"
 887                 for suparg in var[2]:
 888                     if isinstance(suparg, ConvInfo):
 889                         trait_constructor_arguments += ", " + suparg.arg_name
 890                     else:
 891                         trait_constructor_arguments += ", " + suparg[1]
 892
 893         # BUILD INTERFACE METHODS
 894         out_java_interface = ""
 895         out_interface_implementation_overrides = ""
 896         java_methods = []
 897         for fn_line in field_function_lines:
 898             java_method_descriptor = ""
 899             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 900                 out_java_interface += "\t/**" + fn_line.docs.replace("\n", "\n\t * ") + "\n\t */\n"
 901                 out_java_interface += "\t" + fn_line.fn_name + "("
 902                 out_interface_implementation_overrides += f"\t\t\t{fn_line.fn_name} ("
 903
 904                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 905                     if idx >= 1:
 906                         out_java_interface += ", "
 907                         out_interface_implementation_overrides += ", "
 908                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 909                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 910                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 911                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n"
 912                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 913                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 914
 915                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 916
 917                 for arg_info in fn_line.args_ty:
 918                     if arg_info.to_hu_conv is not None:
 919                         out_interface_implementation_overrides += "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 920
 921                 if fn_line.ret_ty_info.java_ty != "void":
 922                     out_interface_implementation_overrides += "\t\t\t\tconst ret: " + fn_line.ret_ty_info.java_hu_ty + " = arg." + fn_line.fn_name + "("
 923                 else:
 924                     out_interface_implementation_overrides += f"\t\t\t\targ." + fn_line.fn_name + "("
 925
 926                 for idx, arg_info in enumerate(fn_line.args_ty):
 927                     if idx != 0:
 928                         out_interface_implementation_overrides += ", "
 929                     if arg_info.to_hu_conv_name is not None:
 930                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 931                     else:
 932                         out_interface_implementation_overrides += arg_info.arg_name
 933
 934                 out_interface_implementation_overrides += ");\n"
 935                 if fn_line.ret_ty_info.java_ty != "void":
 936                     if fn_line.ret_ty_info.from_hu_conv is not None:
 937                         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"
 938                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 939                             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"
 940                         #if fn_line.ret_ty_info.rust_obj in result_types:
 941                         # XXX: We need to handle this in conversion logic so that its cross-language!
 942                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 943                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 944                         out_interface_implementation_overrides += "\t\t\t\treturn result;\n"
 945                     else:
 946                         out_interface_implementation_overrides += "\t\t\t\treturn ret;\n"
 947                 out_interface_implementation_overrides += f"\t\t\t}},\n"
 948
 949         formatted_trait_docs = trait_doc_comment.replace("\n", "\n * ")
 950         out_typescript_human = f"""
 951 {self.hu_struct_file_prefix}
 952
 953 /** An implementation of {struct_name.replace("LDK","")} */
 954 export interface {struct_name.replace("LDK", "")}Interface {{
 955 {out_java_interface}}}
 956
 957 class {struct_name}Holder {{
 958         held: {struct_name.replace("LDK", "")};
 959 }}
 960
 961 /**
 962  * {formatted_trait_docs}
 963  */
 964 export class {struct_name.replace("LDK","")} extends CommonBase {{
 965         /* @internal */
 966         public bindings_instance?: bindings.{struct_name};
 967
 968         /* @internal */
 969         constructor(_dummy: object, ptr: bigint) {{
 970                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
 971                 this.bindings_instance = null;
 972         }}
 973
 974         /** Creates a new instance of {struct_name.replace("LDK","")} from a given implementation */
 975         public static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 976                 const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 977                 let structImplementation = {{
 978 {out_interface_implementation_overrides}                }} as bindings.{struct_name};
 979 {super_constructor_statements}          const ptr: bigint = bindings.{struct_name}_new(structImplementation{bindings_instantiator});
 980
 981                 impl_holder.held = new {struct_name.replace("LDK", "")}(null, ptr);
 982                 impl_holder.held.bindings_instance = structImplementation;
 983 {pointer_to_adder}              return impl_holder.held;
 984         }}
 985
 986 """
 987         self.obj_defined([struct_name.replace("LDK", ""), struct_name.replace("LDK", "") + "Interface"], "structs")
 988
 989         out_typescript_bindings += "/* @internal */\nexport interface " + struct_name + " {\n"
 990         java_meths = []
 991         for fn_line in field_function_lines:
 992             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 993                 out_typescript_bindings += f"\t{fn_line.fn_name} ("
 994
 995                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 996                     if idx >= 1:
 997                         out_typescript_bindings = out_typescript_bindings + ", "
 998                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 999
1000                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
1001
1002         out_typescript_bindings += "}\n\n"
1003
1004         out_typescript_bindings += f"/* @internal */\nexport function {struct_name}_new(impl: {struct_name}"
1005         for var in flattened_field_var_conversions:
1006             if isinstance(var, ConvInfo):
1007                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
1008             else:
1009                 out_typescript_bindings += f", {var[1]}: {var[0]}"
1010
1011         out_typescript_bindings += f"""): bigint {{
1012         if(!isWasmInitialized) {{
1013                 throw new Error("initializeWasm() must be awaited first!");
1014         }}
1015         var new_obj_idx = js_objs.length;
1016         for (var i = 0; i < js_objs.length; i++) {{
1017                 if (js_objs[i] == null || js_objs[i] == undefined) {{ new_obj_idx = i; break; }}
1018         }}
1019         js_objs[i] = new WeakRef(impl);
1020         return wasm.TS_{struct_name}_new(i);
1021 }}
1022 """
1023
1024         # Now that we've written out our java code (and created java_meths), generate C
1025         out_c = "typedef struct " + struct_name + "_JCalls {\n"
1026         out_c += "\tatomic_size_t refcnt;\n"
1027         out_c += "\tuint32_t instance_ptr;\n"
1028         for var in flattened_field_var_conversions:
1029             if isinstance(var, ConvInfo):
1030                 # We're a regular ol' field
1031                 pass
1032             else:
1033                 # We're a supertrait
1034                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
1035         out_c = out_c + "} " + struct_name + "_JCalls;\n"
1036
1037         for fn_line in field_function_lines:
1038             if fn_line.fn_name == "free":
1039                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
1040                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
1041                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
1042                 out_c = out_c + "\t\tFREE(j_calls);\n"
1043                 out_c = out_c + "\t}\n}\n"
1044
1045         for idx, fn_line in enumerate(field_function_lines):
1046             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
1047                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
1048                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
1049                 if fn_line.self_is_const:
1050                     out_c = out_c + "const void* this_arg"
1051                 else:
1052                     out_c = out_c + "void* this_arg"
1053
1054                 for idx, arg in enumerate(fn_line.args_ty):
1055                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
1056
1057                 out_c = out_c + ") {\n"
1058                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
1059
1060                 for arg_info in fn_line.args_ty:
1061                     if arg_info.ret_conv is not None:
1062                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
1063                         out_c = out_c + arg_info.arg_name
1064                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
1065
1066                 fn_suffix = ""
1067                 assert len(fn_line.args_ty) < 6
1068                 for arg_info in fn_line.args_ty:
1069                     if arg_info.c_ty == "uint64_t" or arg_info.c_ty == "int64_t":
1070                         fn_suffix += "b"
1071                     else:
1072                         fn_suffix += "u"
1073                 for i in range(0, 6 - len(fn_line.args_ty)):
1074                     fn_suffix += "u"
1075                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
1076                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (" + fn_line.ret_ty_info.c_ty + ")"
1077                     out_c += "js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1078                 elif fn_line.ret_ty_info.java_ty == "void":
1079                     out_c = out_c + "\tjs_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1080                 elif fn_line.ret_ty_info.java_hu_ty == "string":
1081                     out_c += "\tjstring ret = (jstring)js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1082                 elif not fn_line.ret_ty_info.passed_as_ptr:
1083                     out_c += "\treturn js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1084                 else:
1085                     out_c += "\tuint64_t ret = js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1086
1087                 self.function_ptrs[self.function_ptr_counter] = (struct_name, fn_line.fn_name)
1088                 self.function_ptr_counter += 1
1089
1090                 for idx, arg_info in enumerate(fn_line.args_ty):
1091                     if arg_info.ret_conv is not None:
1092                         if arg_info.c_ty.endswith("Array"):
1093                             out_c += ", (uint32_t)" + arg_info.ret_conv_name
1094                         else:
1095                             out_c += ", " + arg_info.ret_conv_name
1096                     else:
1097                         assert False # TODO: Would we need some conversion here?
1098                         out_c += ", (uint32_t)" + arg_info.arg_name
1099                 for i in range(0, 6 - len(fn_line.args_ty)):
1100                     out_c += ", 0"
1101                 out_c = out_c + ");\n"
1102                 if fn_line.ret_ty_info.arg_conv is not None:
1103                     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"
1104
1105                 out_c = out_c + "}\n"
1106
1107         # Write out a clone function whether we need one or not, as we use them in moving to rust
1108         out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
1109         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
1110         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
1111         for var in field_var_conversions:
1112             if not isinstance(var, ConvInfo):
1113                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
1114         out_c = out_c + "}\n"
1115
1116         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (JSValue o"
1117         for var in flattened_field_var_conversions:
1118             if isinstance(var, ConvInfo):
1119                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
1120             else:
1121                 out_c = out_c + ", JSValue " + var[1]
1122         out_c = out_c + ") {\n"
1123
1124         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
1125         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
1126         out_c = out_c + "\tcalls->instance_ptr = o;\n"
1127
1128         for (fn_name, java_meth_descr) in java_meths:
1129             if fn_name != "free" and fn_name != "cloned":
1130                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
1131                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
1132
1133         for var in flattened_field_var_conversions:
1134             if isinstance(var, ConvInfo) and var.arg_conv is not None:
1135                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
1136         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
1137         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
1138         for fn_line in field_function_lines:
1139             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
1140                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
1141             elif fn_line.fn_name == "free":
1142                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
1143             else:
1144                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
1145         for var in field_var_conversions:
1146             if isinstance(var, ConvInfo):
1147                 if var.arg_conv_name is not None:
1148                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
1149                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
1150                 else:
1151                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
1152                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
1153             else:
1154                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(" + var[1]
1155                 for suparg in var[2]:
1156                     if isinstance(suparg, ConvInfo):
1157                         out_c += ", " + suparg.arg_name
1158                     else:
1159                         out_c += ", " + suparg[1]
1160                 out_c += "),\n"
1161         out_c = out_c + "\t};\n"
1162         for var in flattened_field_var_conversions:
1163             if not isinstance(var, ConvInfo):
1164                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
1165         out_c = out_c + "\treturn ret;\n"
1166         out_c = out_c + "}\n"
1167
1168         out_c = out_c + self.c_fn_ty_pfx + "uint64_t " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "JSValue o"
1169         for var in flattened_field_var_conversions:
1170             if isinstance(var, ConvInfo):
1171                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
1172             else:
1173                 out_c = out_c + ", JSValue " + var[1]
1174         out_c = out_c + ") {\n"
1175         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
1176         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(o"
1177         for var in flattened_field_var_conversions:
1178             if isinstance(var, ConvInfo):
1179                 out_c = out_c + ", " + var.arg_name
1180             else:
1181                 out_c = out_c + ", " + var[1]
1182         out_c = out_c + ");\n"
1183         out_c = out_c + "\treturn tag_ptr(res_ptr, true);\n"
1184         out_c = out_c + "}\n"
1185
1186         return (out_typescript_bindings, out_typescript_human, out_c)
1187
1188     def trait_struct_inc_refcnt(self, ty_info):
1189         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
1190         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
1191         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_cloned(&" + ty_info.var_name + "_conv);\n}"
1192         return base_conv
1193
1194     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
1195         bindings_type = struct_name.replace("LDK", "")
1196         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
1197
1198         out_java_enum = ""
1199         out_java = ""
1200         out_c = ""
1201
1202         out_java_enum += (self.hu_struct_file_prefix)
1203
1204         java_hu_class = "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
1205         java_hu_class += "export class " + java_hu_type + " extends CommonBase {\n"
1206         java_hu_class += "\tprotected constructor(_dummy: object, ptr: bigint) { super(ptr, bindings." + bindings_type + "_free); }\n"
1207         java_hu_class += "\t/* @internal */\n"
1208         java_hu_class += f"\tpublic static constr_from_ptr(ptr: bigint): {java_hu_type} {{\n"
1209         java_hu_class += f"\t\tconst raw_ty: number = bindings." + struct_name + "_ty_from_ptr(ptr);\n"
1210         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"
1211         out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)untag_ptr(ptr);\n"
1212         out_c += "\tswitch(obj->tag) {\n"
1213         java_hu_class += "\t\tswitch (raw_ty) {\n"
1214         java_hu_subclasses = ""
1215
1216         out_java += "/* @internal */\nexport class " + struct_name + " {\n"
1217         out_java += "\tprotected constructor() {}\n"
1218         var_idx = 0
1219         for var in variant_list:
1220             java_hu_subclasses += "/** A " + java_hu_type + " of type " + var.var_name + " */\n"
1221             java_hu_subclasses += "export class " + java_hu_type + "_" + var.var_name + " extends " + java_hu_type + " {\n"
1222             java_hu_class += f"\t\t\tcase {var_idx}: "
1223             java_hu_class += "return new " + java_hu_type + "_" + var.var_name + "(ptr);\n"
1224             out_c += f"\t\tcase {struct_name}_{var.var_name}: return {var_idx};\n"
1225             hu_conv_body = ""
1226             for idx, (field_ty, field_docs) in enumerate(var.fields):
1227                 if field_docs is not None:
1228                     java_hu_subclasses += "\t/**\n\t * " + field_docs.replace("\n", "\n\t * ") + "\n\t */\n"
1229                 java_hu_subclasses += "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
1230                 if field_ty.to_hu_conv is not None:
1231                     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"
1232                     hu_conv_body += f"\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1233                     hu_conv_body += f"\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1234                 else:
1235                     hu_conv_body += f"\t\tthis.{field_ty.arg_name} = bindings.{struct_name}_{var.var_name}_get_{field_ty.arg_name}(ptr);\n"
1236             java_hu_subclasses += "\t/* @internal */\n"
1237             java_hu_subclasses += "\tpublic constructor(ptr: bigint) {\n\t\tsuper(null, ptr);\n"
1238             java_hu_subclasses = java_hu_subclasses + hu_conv_body
1239             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
1240             var_idx += 1
1241         out_java += "}\n"
1242         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"
1243         out_java += self.fn_call_body(struct_name + "_ty_from_ptr", "uint32_t", "number", "ptr: bigint", "ptr")
1244         out_c += ("\t\tdefault: abort();\n")
1245         out_c += ("\t}\n}\n")
1246
1247         for var in variant_list:
1248             for idx, (field_map, _) in enumerate(var.fields):
1249                 fn_name = f"{struct_name}_{var.var_name}_get_{field_map.arg_name}"
1250                 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"
1251                 out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)untag_ptr(ptr);\n"
1252                 out_c += f"\tassert(obj->tag == {struct_name}_{var.var_name});\n"
1253                 if field_map.ret_conv is not None:
1254                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1255                     if var.tuple_variant:
1256                         out_c += "obj->" + camel_to_snake(var.var_name)
1257                     else:
1258                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
1259                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1260                     out_c += "\treturn " + field_map.ret_conv_name + ";\n"
1261                 else:
1262                     if var.tuple_variant:
1263                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + ";\n"
1264                     else:
1265                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name + ";\n"
1266                 out_c += "}\n"
1267                 out_java += self.fn_call_body(fn_name, field_map.c_ty, field_map.java_ty, "ptr: bigint", "ptr")
1268         out_java_enum += java_hu_class
1269         self.struct_file_suffixes[java_hu_type] = java_hu_subclasses
1270         self.obj_defined([java_hu_type], "structs")
1271         return (out_java, out_java_enum, out_c)
1272
1273     def map_opaque_struct(self, struct_name, struct_doc_comment):
1274         implementations = ""
1275         method_header = ""
1276
1277         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
1278         out_opaque_struct_human = f"{self.hu_struct_file_prefix}"
1279         constructor_body = "super(ptr, bindings." + struct_name.replace("LDK","") + "_free);"
1280         extra_docs = ""
1281         extra_body = ""
1282         if struct_name.startswith("LDKLocked") or struct_name.startswith("LDKReadOnly"):
1283             extra_docs = "\n * This type represents a lock and MUST BE MANUALLY FREE'd!"
1284             constructor_body = 'super(ptr, () => { throw new Error("Locks must be manually freed with free()"); });'
1285             extra_body = f"""
1286         /** Releases this lock */
1287         public free() {{
1288                 bindings.{struct_name.replace("LDK","")}_free(this.ptr);
1289                 CommonBase.set_null_skip_free(this);
1290         }}"""
1291         formatted_doc_comment = struct_doc_comment.replace("\n", "\n * ")
1292         out_opaque_struct_human += f"""
1293 /**{extra_docs}
1294  * {formatted_doc_comment}
1295  */
1296 export class {hu_name} extends CommonBase {implementations}{{
1297         /* @internal */
1298         public constructor(_dummy: object, ptr: bigint) {{
1299                 {constructor_body}
1300         }}{extra_body}
1301
1302 """
1303         self.obj_defined([hu_name], "structs")
1304         return out_opaque_struct_human
1305
1306     def map_tuple(self, struct_name):
1307         return self.map_opaque_struct(struct_name, "A Tuple")
1308
1309     def map_result(self, struct_name, res_map, err_map):
1310         human_ty = struct_name.replace("LDKCResult", "Result")
1311
1312         suffixes = f"export class {human_ty}_OK extends {human_ty} {{\n"
1313         if res_map.java_hu_ty != "void":
1314             suffixes += "\tpublic res: " + res_map.java_hu_ty + ";\n"
1315         suffixes += f"""
1316         /* @internal */
1317         public constructor(_dummy: object, ptr: bigint) {{
1318                 super(_dummy, ptr);
1319 """
1320         if res_map.java_hu_ty == "void":
1321             pass
1322         elif res_map.to_hu_conv is not None:
1323             suffixes += "\t\tconst res: " + res_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1324             suffixes += "\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t")
1325             suffixes += "\n\t\tthis.res = " + res_map.to_hu_conv_name + ";\n"
1326         else:
1327             suffixes += "\t\tthis.res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1328         suffixes += "\t}\n}\n"
1329
1330         suffixes += f"export class {human_ty}_Err extends {human_ty} {{\n"
1331         if err_map.java_hu_ty != "void":
1332             suffixes += "\tpublic err: " + err_map.java_hu_ty + ";\n"
1333         suffixes += f"""
1334         /* @internal */
1335         public constructor(_dummy: object, ptr: bigint) {{
1336                 super(_dummy, ptr);
1337 """
1338         if err_map.java_hu_ty == "void":
1339             pass
1340         elif err_map.to_hu_conv is not None:
1341             suffixes += "\t\tconst err: " + err_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1342             suffixes += "\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t")
1343             suffixes += "\n\t\tthis.err = " + err_map.to_hu_conv_name + ";\n"
1344         else:
1345             suffixes += "\t\tthis.err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1346         suffixes += "\t}\n}"
1347
1348         self.struct_file_suffixes[human_ty] = suffixes
1349         self.obj_defined([human_ty], "structs")
1350
1351         return f"""{self.hu_struct_file_prefix}
1352
1353 export class {human_ty} extends CommonBase {{
1354         protected constructor(_dummy: object, ptr: bigint) {{
1355                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1356         }}
1357         /* @internal */
1358         public static constr_from_ptr(ptr: bigint): {human_ty} {{
1359                 if (bindings.{struct_name.replace("LDK", "")}_is_ok(ptr)) {{
1360                         return new {human_ty}_OK(null, ptr);
1361                 }} else {{
1362                         return new {human_ty}_Err(null, ptr);
1363                 }}
1364         }}
1365 """
1366
1367     def fn_call_body(self, method_name, return_c_ty, return_java_ty, method_argument_string, native_call_argument_string):
1368         has_return_value = return_c_ty != 'void'
1369         return_statement = 'return nativeResponseValue;'
1370         if not has_return_value:
1371             return_statement = '// debug statements here'
1372
1373         return f"""/* @internal */
1374 export function {method_name}({method_argument_string}): {return_java_ty} {{
1375         if(!isWasmInitialized) {{
1376                 throw new Error("initializeWasm() must be awaited first!");
1377         }}
1378         const nativeResponseValue = wasm.TS_{method_name}({native_call_argument_string});
1379         {return_statement}
1380 }}
1381 """
1382     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):
1383         out_java = ""
1384         out_c = ""
1385         out_java_struct = None
1386
1387         out_java += ("\t")
1388         out_c += (self.c_fn_ty_pfx)
1389         out_c += (return_type_info.c_ty)
1390         out_java += (return_type_info.java_ty)
1391         if return_type_info.ret_conv is not None:
1392             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1393         out_java += (" " + method_name + "(")
1394         out_c += (" "  + self.c_fn_name_define_pfx(method_name, True))
1395
1396         method_argument_string = ""
1397         native_call_argument_string = ""
1398         for idx, arg_conv_info in enumerate(argument_types):
1399             if idx != 0:
1400                 method_argument_string += (", ")
1401                 native_call_argument_string += ', '
1402                 out_c += (", ")
1403             if arg_conv_info.c_ty != "void":
1404                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1405                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
1406                 native_call_argument_string += arg_conv_info.arg_name
1407         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)
1408
1409         out_java_struct = ""
1410         if doc_comment is not None:
1411             out_java_struct = "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
1412
1413         if not args_known:
1414             out_java_struct += ("\t// Skipped " + method_name + "\n")
1415         else:
1416             if not takes_self:
1417                 out_java_struct += (
1418                         "\tpublic static constructor_" + meth_n + "(")
1419             else:
1420                 out_java_struct += ("\tpublic " + meth_n + "(")
1421             for idx, arg in enumerate(argument_types):
1422                 if idx != 0:
1423                     if not takes_self or idx > 1:
1424                         out_java_struct += (", ")
1425                 elif takes_self:
1426                     continue
1427                 if arg.java_ty != "void":
1428                     if arg.arg_name in default_constructor_args:
1429                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1430                             if explode_idx != 0:
1431                                 out_java_struct += (", ")
1432                             out_java_struct += arg.arg_name + "_" + explode_arg.arg_name + ": " + explode_arg.java_hu_ty
1433                     else:
1434                         out_java_struct += arg.arg_name + ": " + arg.java_hu_ty
1435
1436         out_c += (") {\n")
1437         if out_java_struct is not None:
1438             out_java_struct += "): " + return_type_info.java_hu_ty + " {\n"
1439         for info in argument_types:
1440             if info.arg_conv is not None:
1441                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1442         if return_type_info.ret_conv is not None:
1443             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1444         elif return_type_info.c_ty != "void":
1445             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1446         else:
1447             out_c += ("\t")
1448         if c_call_string is None:
1449             out_c += (method_name + "(")
1450         else:
1451             out_c += (c_call_string)
1452         for idx, info in enumerate(argument_types):
1453             if info.arg_conv_name is not None:
1454                 if idx != 0:
1455                     out_c += (", ")
1456                 elif c_call_string is not None:
1457                     continue
1458                 out_c += (info.arg_conv_name)
1459         out_c += (")")
1460         if return_type_info.ret_conv is not None:
1461             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1462         else:
1463             out_c += (";")
1464         for info in argument_types:
1465             if info.arg_conv_cleanup is not None:
1466                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1467         if return_type_info.ret_conv is not None:
1468             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1469         elif return_type_info.c_ty != "void":
1470             out_c += ("\n\treturn ret_val;")
1471         out_c += ("\n}\n\n")
1472
1473         if args_known:
1474             out_java_struct += ("\t\t")
1475             if return_type_info.java_ty != "void":
1476                 out_java_struct += "const ret: " + return_type_info.java_ty + " = "
1477             out_java_struct += ("bindings." + method_name + "(")
1478             for idx, info in enumerate(argument_types):
1479                 if idx != 0:
1480                     out_java_struct += (", ")
1481                 if idx == 0 and takes_self:
1482                     out_java_struct += ("this.ptr")
1483                 elif info.arg_name in default_constructor_args:
1484                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1485                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1486                         if explode_idx != 0:
1487                             out_java_struct += (", ")
1488                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1489                         if explode_arg.from_hu_conv is not None:
1490                             out_java_struct += (
1491                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1492                         else:
1493                             out_java_struct += (expl_arg_name)
1494                     out_java_struct += (")")
1495                 elif info.from_hu_conv is not None:
1496                     out_java_struct += (info.from_hu_conv[0])
1497                 else:
1498                     out_java_struct += (info.arg_name)
1499             out_java_struct += (");\n")
1500             if return_type_info.to_hu_conv is not None:
1501                 if not takes_self:
1502                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1503                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1504                 else:
1505                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1506
1507             for idx, info in enumerate(argument_types):
1508                 if idx == 0 and takes_self:
1509                     pass
1510                 elif info.arg_name in default_constructor_args:
1511                     for explode_arg in default_constructor_args[info.arg_name]:
1512                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1513                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1514                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1515                                                                                              expl_arg_name).replace(
1516                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1517                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1518                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1519                         out_java_struct += (
1520                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1521                     else:
1522                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1523
1524             if return_type_info.to_hu_conv_name is not None:
1525                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1526             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1527                 out_java_struct += ("\t\treturn ret;\n")
1528             out_java_struct += ("\t}\n\n")
1529
1530         return (out_java, out_c, out_java_struct)
1531
1532     def cleanup(self):
1533         for struct in self.struct_file_suffixes:
1534             with open(self.outdir + "/structs/" + struct + self.file_ext, "a") as src:
1535                 src.write(self.struct_file_suffixes[struct])
1536
1537         with open(self.outdir + "/bindings.mts", "a") as bindings:
1538             bindings.write("""
1539
1540 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) {
1541         const weak: WeakRef<object> = js_objs[obj_ptr];
1542         if (weak == null || weak == undefined) {
1543                 console.error("Got function call on unknown/free'd JS object!");
1544                 throw new Error("Got function call on unknown/free'd JS object!");
1545         }
1546         const obj: object = weak.deref();
1547         if (obj == null || obj == undefined) {
1548                 console.error("Got function call on GC'd JS object!");
1549                 throw new Error("Got function call on GC'd JS object!");
1550         }
1551         var fn;
1552 """)
1553             bindings.write("\tswitch (fn_id) {\n")
1554             for f in self.function_ptrs:
1555                 bindings.write(f"\t\tcase {str(f)}: fn = Object.getOwnPropertyDescriptor(obj, \"{self.function_ptrs[f][1]}\"); break;\n")
1556
1557             bindings.write("""\t\tdefault:
1558                         console.error("Got unknown function call from C!");
1559                         throw new Error("Got unknown function call from C!");
1560         }
1561         if (fn == null || fn == undefined) {
1562                 console.error("Got function call on incorrect JS object!");
1563                 throw new Error("Got function call on incorrect JS object!");
1564         }
1565         const ret = fn.value.bind(obj)(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10);
1566         if (ret === undefined || ret === null) return BigInt(0);
1567         return BigInt(ret);
1568 }""")