_ 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             bool = ['boolean', 'boolean', 'XXX'],
  21             uint8_t = ['number', 'number', 'Uint8Array'],
  22             uint16_t = ['number', 'number', 'Uint16Array'],
  23             uint32_t = ['number', 'number', 'Uint32Array'],
  24             int64_t = ['bigint', 'bigint', 'BigInt64Array'],
  25             uint64_t = ['bigint', 'bigint', 'BigUint64Array'],
  26         )
  27         self.java_type_map = dict(
  28             String = "number"
  29         )
  30         self.java_hu_type_map = dict(
  31             String = "string"
  32         )
  33
  34         self.to_hu_conv_templates = dict(
  35             ptr = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  36             default = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  37         )
  38
  39         self.bindings_header = """
  40 import * as version from './version.mjs';
  41 import { UInt5, WitnessVersion } from './structs/CommonBase.mjs';
  42
  43 const imports: any = {};
  44 imports.env = {};
  45
  46 var js_objs: Array<WeakRef<object>> = [];
  47 var js_invoke: Function;
  48 var getRandomValues: Function;
  49
  50 imports.wasi_snapshot_preview1 = {
  51         "fd_write": (fd: number, iovec_array_ptr: number, iovec_array_len: number, bytes_written_ptr: number) => {
  52                 // This should generally only be used to print panic messages
  53                 const ptr_len_view = new Uint32Array(wasm.memory.buffer, iovec_array_ptr, iovec_array_len * 2);
  54                 var bytes_written = 0;
  55                 for (var i = 0; i < iovec_array_len; i++) {
  56                         const bytes_view = new Uint8Array(wasm.memory.buffer, ptr_len_view[i*2], ptr_len_view[i*2+1]);
  57                         console.log("[fd " + fd + "]: " + String.fromCharCode(...bytes_view));
  58                         bytes_written += ptr_len_view[i*2+1]!;
  59                 }
  60                 const written_view = new Uint32Array(wasm.memory.buffer, bytes_written_ptr, 1);
  61                 written_view[0] = bytes_written;
  62                 return 0;
  63         },
  64         "fd_close": (_fd: number) => {
  65                 // This is not generally called, but may be referenced in debug builds
  66                 console.log("wasi_snapshot_preview1:fd_close");
  67                 return 58; // Not Supported
  68         },
  69         "fd_seek": (_fd: number, _offset: bigint, _whence: number, _new_offset: number) => {
  70                 // This is not generally called, but may be referenced in debug builds
  71                 console.log("wasi_snapshot_preview1:fd_seek");
  72                 return 58; // Not Supported
  73         },
  74         "random_get": (buf_ptr: number, buf_len: number) => {
  75                 const buf = new Uint8Array(wasm.memory.buffer, buf_ptr, buf_len);
  76                 getRandomValues(buf);
  77                 return 0;
  78         },
  79         "environ_sizes_get": (environ_var_count_ptr: number, environ_len_ptr: number) => {
  80                 // This is called before fd_write to format + print panic messages
  81                 const out_count_view = new Uint32Array(wasm.memory.buffer, environ_var_count_ptr, 1);
  82                 out_count_view[0] = 0;
  83                 const out_len_view = new Uint32Array(wasm.memory.buffer, environ_len_ptr, 1);
  84                 out_len_view[0] = 0;
  85                 return 0;
  86         },
  87         "environ_get": (_environ_ptr: number, _environ_buf_ptr: number) => {
  88                 // This is called before fd_write to format + print panic messages,
  89                 // but only if we have variables in environ_sizes_get, so shouldn't ever actually happen!
  90                 console.log("wasi_snapshot_preview1:environ_get");
  91                 return 58; // Note supported - we said there were 0 environment entries!
  92         },
  93         "proc_exit" : () => {
  94                 console.log("wasi_snapshot_preview1:proc_exit");
  95         },
  96 };
  97
  98 var wasm: any = null;
  99 let isWasmInitialized: boolean = false;
 100
 101 async function finishInitializeWasm(wasmInstance: WebAssembly.Instance) {
 102         if (typeof crypto === "undefined") {
 103                 var crypto_import = (await import('crypto')).webcrypto;
 104                 getRandomValues = crypto_import.getRandomValues.bind(crypto_import);
 105         } else {
 106                 getRandomValues = crypto.getRandomValues.bind(crypto);
 107         }
 108
 109         wasm = wasmInstance.exports;
 110         if (!wasm.test_bigint_pass_deadbeef0badf00d(BigInt("0xdeadbeef0badf00d"))) {
 111                 throw new Error(\"Currently need BigInt-as-u64 support, try ----experimental-wasm-bigint");
 112         }
 113
 114         if (decodeString(wasm.TS_get_lib_version_string()) !== version.get_ldk_java_bindings_version())
 115                 throw new Error(\"Compiled LDK library and LDK class files do not match\");
 116         // Fetching the LDK versions from C also checks that the header and binaries match
 117         const c_bindings_ver: number = wasm.TS_get_ldk_c_bindings_version();
 118         const ldk_ver: number = wasm.TS_get_ldk_version();
 119         if (c_bindings_ver == 0)
 120                 throw new Error(\"LDK version did not match the header we built against\");
 121         if (ldk_ver == 0)
 122                 throw new Error(\"LDK C bindings version did not match the header we built against\");
 123         const c_bindings_version: string = decodeString(c_bindings_ver)
 124         const ldk_version: string = decodeString(ldk_ver);
 125         console.log(\"Loaded LDK-Java Bindings with LDK \" + ldk_version + \" and LDK-C-Bindings \" + c_bindings_version);
 126
 127         isWasmInitialized = true;
 128 }
 129
 130 const fn_list = ["uuuuuu", "buuuuu", "bbuuuu", "bbbuuu", "bbbbuu", "bbbbbu",
 131         "bbbbbb", "ubuubu", "ubuuuu", "ubbuuu", "uubuuu", "uububu", "ububuu"];
 132
 133 /* @internal */
 134 export async function initializeWasmFromUint8Array(wasmBinary: Uint8Array) {
 135         for (const fn of fn_list) { imports.env["js_invoke_function_" + fn] = js_invoke; }
 136         const { instance: wasmInstance } = await WebAssembly.instantiate(wasmBinary, imports);
 137         await finishInitializeWasm(wasmInstance);
 138 }
 139
 140 /* @internal */
 141 export async function initializeWasmFetch(uri: string) {
 142         for (const fn of fn_list) { imports.env["js_invoke_function_" + fn] = js_invoke; }
 143         const stream = fetch(uri);
 144         const { instance: wasmInstance } = await WebAssembly.instantiateStreaming(stream, imports);
 145         await finishInitializeWasm(wasmInstance);
 146 }"""
 147
 148         self.bindings_header += """
 149 // WASM CODEC
 150
 151 /* @internal */
 152 export function uint5ArrToBytes(inputArray: Array<UInt5>): Uint8Array {
 153         const arr = new Uint8Array(inputArray.length);
 154         for (var i = 0; i < inputArray.length; i++) {
 155                 arr[i] = inputArray[i]!.getVal();
 156         }
 157         return arr;
 158 }
 159
 160 /* @internal */
 161 export function WitnessVersionArrToBytes(inputArray: Array<WitnessVersion>): Uint8Array {
 162         const arr = new Uint8Array(inputArray.length);
 163         for (var i = 0; i < inputArray.length; i++) {
 164                 arr[i] = inputArray[i]!.getVal();
 165         }
 166         return arr;
 167 }
 168
 169
 170
 171 /* @internal */
 172 export function encodeUint128 (inputVal: bigint): number {
 173         if (inputVal >= 0x10000000000000000000000000000000n) throw "U128s cannot exceed 128 bits";
 174         const cArrayPointer = wasm.TS_malloc(16 + 8);
 175         const arrayLengthView = new BigUint64Array(wasm.memory.buffer, cArrayPointer, 1);
 176         arrayLengthView[0] = BigInt(16);
 177         const arrayMemoryView = new Uint8Array(wasm.memory.buffer, cArrayPointer + 8, 16);
 178         for (var i = 0; i < 16; i++) arrayMemoryView[i] = Number((inputVal >> BigInt(i)*8n) & 0xffn);
 179         return cArrayPointer;
 180 }
 181 /* @internal */
 182 export function encodeUint8Array (inputArray: Uint8Array|null): number {
 183         if (inputArray == null) return 0;
 184         const cArrayPointer = wasm.TS_malloc(inputArray.length + 8);
 185         const arrayLengthView = new BigUint64Array(wasm.memory.buffer, cArrayPointer, 1);
 186         arrayLengthView[0] = BigInt(inputArray.length);
 187         const arrayMemoryView = new Uint8Array(wasm.memory.buffer, cArrayPointer + 8, inputArray.length);
 188         arrayMemoryView.set(inputArray);
 189         return cArrayPointer;
 190 }
 191 /* @internal */
 192 export function encodeUint16Array (inputArray: Uint16Array|Array<number>|null): number {
 193         if (inputArray == null) return 0;
 194         const cArrayPointer = wasm.TS_malloc((inputArray.length + 4) * 2);
 195         const arrayLengthView = new BigUint64Array(wasm.memory.buffer, cArrayPointer, 1);
 196         arrayLengthView[0] = BigInt(inputArray.length);
 197         const arrayMemoryView = new Uint16Array(wasm.memory.buffer, cArrayPointer + 8, inputArray.length);
 198         arrayMemoryView.set(inputArray);
 199         return cArrayPointer;
 200 }
 201 /* @internal */
 202 export function encodeUint32Array (inputArray: Uint32Array|Array<number>|null): number {
 203         if (inputArray == null) return 0;
 204         const cArrayPointer = wasm.TS_malloc((inputArray.length + 2) * 4);
 205         const arrayLengthView = new BigUint64Array(wasm.memory.buffer, cArrayPointer, 1);
 206         arrayLengthView[0] = BigInt(inputArray.length);
 207         const arrayMemoryView = new Uint32Array(wasm.memory.buffer, cArrayPointer + 8, inputArray.length);
 208         arrayMemoryView.set(inputArray);
 209         return cArrayPointer;
 210 }
 211 /* @internal */
 212 export function encodeUint64Array (inputArray: BigUint64Array|Array<bigint>|null): number {
 213         if (inputArray == null) return 0;
 214         const cArrayPointer = wasm.TS_malloc((inputArray.length + 1) * 8);
 215         const arrayMemoryView = new BigUint64Array(wasm.memory.buffer, cArrayPointer, inputArray.length + 1);
 216         arrayMemoryView[0] = BigInt(inputArray.length);
 217         arrayMemoryView.set(inputArray, 1);
 218         return cArrayPointer;
 219 }
 220
 221 /* @internal */
 222 export function check_arr_len(arr: Uint8Array|null, len: number): Uint8Array|null {
 223         if (arr !== null && arr.length != len) { throw new Error("Expected array of length " + len + " got " + arr.length); }
 224         return arr;
 225 }
 226
 227 /* @internal */
 228 export function check_16_arr_len(arr: Uint16Array|null, len: number): Uint16Array|null {
 229         if (arr !== null && arr.length != len) { throw new Error("Expected array of length " + len + " got " + arr.length); }
 230         return arr;
 231 }
 232
 233 /* @internal */
 234 export function getArrayLength(arrayPointer: number): number {
 235         const arraySizeViewer = new BigUint64Array(wasm.memory.buffer, arrayPointer, 1);
 236         const len = arraySizeViewer[0]!;
 237         if (len >= (2n ** 32n)) throw new Error("Bogus Array Size");
 238         return Number(len % (2n ** 32n));
 239 }
 240 /* @internal */
 241 export function decodeUint128 (arrayPointer: number, free = true): bigint {
 242         const arraySize = getArrayLength(arrayPointer);
 243         if (arraySize != 16) throw "Need 16 bytes for a uint128";
 244         const actualArrayViewer = new Uint8Array(wasm.memory.buffer, arrayPointer + 8, arraySize);
 245         var val = 0n;
 246         for (var i = 0; i < 16; i++) {
 247                 val <<= 8n;
 248                 val |= BigInt(actualArrayViewer[i]!);
 249         }
 250         if (free) {
 251                 wasm.TS_free(arrayPointer);
 252         }
 253         return val;
 254 }
 255 /* @internal */
 256 export function decodeUint8Array (arrayPointer: number, free = true): Uint8Array {
 257         const arraySize = getArrayLength(arrayPointer);
 258         const actualArrayViewer = new Uint8Array(wasm.memory.buffer, arrayPointer + 8, arraySize);
 259         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 260         // will free the underlying memory when it becomes unreachable instead of copying here.
 261         // Note that doing so may have edge-case interactions with memory resizing (invalidating the buffer).
 262         const actualArray = actualArrayViewer.slice(0, arraySize);
 263         if (free) {
 264                 wasm.TS_free(arrayPointer);
 265         }
 266         return actualArray;
 267 }
 268 /* @internal */
 269 export function decodeUint16Array (arrayPointer: number, free = true): Uint16Array {
 270         const arraySize = getArrayLength(arrayPointer);
 271         const actualArrayViewer = new Uint16Array(wasm.memory.buffer, arrayPointer + 8, arraySize);
 272         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 273         // will free the underlying memory when it becomes unreachable instead of copying here.
 274         // Note that doing so may have edge-case interactions with memory resizing (invalidating the buffer).
 275         const actualArray = actualArrayViewer.slice(0, arraySize);
 276         if (free) {
 277                 wasm.TS_free(arrayPointer);
 278         }
 279         return actualArray;
 280 }
 281 /* @internal */
 282 export function decodeUint64Array (arrayPointer: number, free = true): bigint[] {
 283         const arraySize = getArrayLength(arrayPointer);
 284         const actualArrayViewer = new BigUint64Array(
 285                 wasm.memory.buffer, // value
 286                 arrayPointer + 8, // offset (ignoring length bytes)
 287                 arraySize // uint32 count
 288         );
 289         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 290         // will free the underlying memory when it becomes unreachable instead of copying here.
 291         const actualArray = new Array(arraySize);
 292         for (var i = 0; i < arraySize; i++) actualArray[i] = actualArrayViewer[i];
 293         if (free) {
 294                 wasm.TS_free(arrayPointer);
 295         }
 296         return actualArray;
 297 }
 298
 299 export function freeWasmMemory(pointer: number) { wasm.TS_free(pointer); }
 300
 301 /* @internal */
 302 export function getU64ArrayElem(arrayPointer: number, idx: number): bigint {
 303         const actualArrayViewer = new BigUint64Array(wasm.memory.buffer, arrayPointer + 8, idx + 1);
 304         return actualArrayViewer[idx]!;
 305 }
 306
 307 /* @internal */
 308 export function getU32ArrayElem(arrayPointer: number, idx: number): number {
 309         const actualArrayViewer = new Uint32Array(wasm.memory.buffer, arrayPointer + 8, idx + 1);
 310         return actualArrayViewer[idx]!;
 311 }
 312
 313 /* @internal */
 314 export function getU8ArrayElem(arrayPointer: number, idx: number): number {
 315         const actualArrayViewer = new Uint8Array(wasm.memory.buffer, arrayPointer + 8, idx + 1);
 316         return actualArrayViewer[idx]!;
 317 }
 318
 319
 320 /* @internal */
 321 export function encodeString(str: string): number {
 322         const charArray = new TextEncoder().encode(str);
 323         return encodeUint8Array(charArray);
 324 }
 325
 326 /* @internal */
 327 export function decodeString(stringPointer: number, free = true): string {
 328         const arraySize = getArrayLength(stringPointer);
 329         const memoryView = new Uint8Array(wasm.memory.buffer, stringPointer + 8, arraySize);
 330         const result = new TextDecoder("utf-8").decode(memoryView);
 331
 332         if (free) {
 333                 wasm.TS_free(stringPointer);
 334         }
 335
 336         return result;
 337 }
 338 """
 339         if DEBUG:
 340             self.bindings_header += """
 341 /* @internal */
 342 export function getRemainingAllocationCount(): number {
 343         return wasm.TS_allocs_remaining();
 344 }
 345 /* @internal */
 346 export function debugPrintRemainingAllocs() {
 347         wasm.TS_print_leaks();
 348 }
 349 """
 350         else:
 351             self.bindings_header += "\n/* @internal */ export function getRemainingAllocationCount(): number { return 0; }\n"
 352             self.bindings_header += "/* @internal */ export function debugPrintRemainingAllocs() { }\n"
 353
 354         with open(outdir + "/index.mts", 'a') as index:
 355             index.write("""import { initializeWasmFetch, initializeWasmFromUint8Array } from './bindings.mjs';
 356 /** Initializes the WASM backend by calling `fetch()` on the given URI - Browser only */
 357 export async function initializeWasmWebFetch(uri: string) {
 358         await initializeWasmFetch(uri);
 359 }
 360 /** Initializes the WASM backend given a Uint8Array of the .wasm binary file - Browser or Node.JS */
 361 export async function initializeWasmFromBinary(bin: Uint8Array) {
 362         await initializeWasmFromUint8Array(bin);
 363 }
 364
 365 export * from './structs/UtilMethods.mjs';
 366 """)
 367
 368         self.bindings_version_file = """export function get_ldk_java_bindings_version(): String {
 369         return "<git_version_ldk_garbagecollected>";
 370 }"""
 371
 372         self.common_base = """
 373 function freer(f: () => void) { f() }
 374 const finalizer = new FinalizationRegistry(freer);
 375 function get_freeer(ptr: bigint, free_fn: (ptr: bigint) => void) {
 376         return () => {
 377                 free_fn(ptr);
 378         }
 379 }
 380
 381 export class CommonBase {
 382         protected ptr: bigint;
 383         protected ptrs_to: object[] = [];
 384         protected constructor(ptr: bigint, free_fn: (ptr: bigint) => void) {
 385                 this.ptr = ptr;
 386                 if (ptr != 0n){
 387                         finalizer.register(this, get_freeer(ptr, free_fn), this);
 388                 }
 389         }
 390         // In Java, protected means "any subclass can access fields on any other subclass'"
 391         // In TypeScript, protected means "any subclass can access parent fields on instances of itself"
 392         // To work around this, we add accessors for other instances' protected fields here.
 393         protected static add_ref_from(holder: CommonBase|null, referent: object|null) {
 394                 if (holder !== null && referent !== null) { holder.ptrs_to.push(referent); }
 395         }
 396         protected static get_ptr_of(o: CommonBase) {
 397                 return o.ptr;
 398         }
 399         protected static set_null_skip_free(o: CommonBase) {
 400                 o.ptr = 0n;
 401                 // @ts-ignore TypeScript is wrong about the returnvalue of unregister here!
 402                 const did_unregister: boolean = finalizer.unregister(o);
 403                 if (!did_unregister)
 404                         throw new Error("FinalizationRegistry unregister should always unregister unless you double-free'd");
 405         }
 406 }
 407
 408 export class UInt5 {
 409         public constructor(private val: number) {
 410                 if (val > 32 || val < 0) throw new Error("UInt5 value is out of range");
 411         }
 412         public getVal(): number {
 413                 return this.val;
 414         }
 415 }
 416
 417 export class WitnessVersion {
 418         public constructor(private val: number) {
 419                 if (val > 16 || val < 0) throw new Error("WitnessVersion value is out of range");
 420         }
 421         public getVal(): number {
 422                 return this.val;
 423         }
 424 }
 425
 426 export class UnqualifiedError {
 427         public constructor(_val: number) {}
 428 }
 429 """
 430
 431         self.txout_defn = """export class TxOut extends CommonBase {
 432         /** The script_pubkey in this output */
 433         public script_pubkey: Uint8Array;
 434         /** The value, in satoshis, of this output */
 435         public value: bigint;
 436
 437         /* @internal */
 438         public constructor(_dummy: null, ptr: bigint) {
 439                 super(ptr, bindings.TxOut_free);
 440                 this.script_pubkey = bindings.decodeUint8Array(bindings.TxOut_get_script_pubkey(ptr));
 441                 this.value = bindings.TxOut_get_value(ptr);
 442         }
 443         public static constructor_new(value: bigint, script_pubkey: Uint8Array): TxOut {
 444                 return new TxOut(null, bindings.TxOut_new(bindings.encodeUint8Array(script_pubkey), value));
 445         }
 446 }"""
 447         self.obj_defined(["TxOut"], "structs")
 448
 449         self.txin_defn = """export class TxIn extends CommonBase {
 450         /** The witness in this input, in serialized form */
 451         public witness: Uint8Array;
 452         /** The script_sig in this input */
 453         public script_sig: Uint8Array;
 454         /** The transaction output's sequence number */
 455         public sequence: number;
 456         /** The txid this input is spending */
 457         public previous_txid: Uint8Array;
 458         /** The output index within the spent transaction of the output this input is spending */
 459         public previous_vout: number;
 460
 461         /* @internal */
 462         public constructor(_dummy: null, ptr: bigint) {
 463                 super(ptr, bindings.TxIn_free);
 464                 this.witness = bindings.decodeUint8Array(bindings.TxIn_get_witness(ptr));
 465                 this.script_sig = bindings.decodeUint8Array(bindings.TxIn_get_script_sig(ptr));
 466                 this.sequence = bindings.TxIn_get_sequence(ptr);
 467                 this.previous_txid = bindings.decodeUint8Array(bindings.TxIn_get_previous_txid(ptr));
 468                 this.previous_vout = bindings.TxIn_get_previous_vout(ptr);
 469         }
 470     public static constructor_new(witness: Uint8Array, script_sig: Uint8Array, sequence: number, previous_txid: Uint8Array, previous_vout: number): TxIn {
 471                 return new TxIn(null, bindings.TxIn_new(bindings.encodeUint8Array(witness), bindings.encodeUint8Array(script_sig), sequence, bindings.encodeUint8Array(previous_txid), previous_vout));
 472         }
 473 }"""
 474         self.obj_defined(["TxIn"], "structs")
 475
 476         self.scalar_defn = """export class BigEndianScalar extends CommonBase {
 477         /** The bytes of the scalar value, in big endian */
 478         public scalar_bytes: Uint8Array;
 479
 480         /* @internal */
 481         public constructor(_dummy: null, ptr: bigint) {
 482                 super(ptr, bindings.BigEndianScalar_free);
 483                 this.scalar_bytes = bindings.decodeUint8Array(bindings.BigEndianScalar_get_bytes(ptr));
 484         }
 485         public static constructor_new(scalar_bytes: Uint8Array): BigEndianScalar {
 486                 return new BigEndianScalar(null, bindings.BigEndianScalar_new(bindings.encodeUint8Array(scalar_bytes)));
 487         }
 488 }"""
 489         self.obj_defined(["BigEndianScalar"], "structs")
 490
 491         self.c_file_pfx = """#include "js-wasm.h"
 492 #include <stdatomic.h>
 493 #include <lightning.h>
 494
 495 // These should be provided...somehow...
 496 void *memset(void *s, int c, size_t n);
 497 void *memcpy(void *dest, const void *src, size_t n);
 498 int memcmp(const void *s1, const void *s2, size_t n);
 499
 500 extern void __attribute__((noreturn)) abort(void);
 501 static inline void assert(bool expression) {
 502         if (!expression) { abort(); }
 503 }
 504
 505 uint32_t __attribute__((export_name("test_bigint_pass_deadbeef0badf00d"))) test_bigint_pass_deadbeef0badf00d(uint64_t val) {
 506         return val == 0xdeadbeef0badf00dULL;
 507 }
 508
 509 """
 510
 511         if not DEBUG:
 512             self.c_file_pfx += """
 513 void *malloc(size_t size);
 514 void free(void *ptr);
 515
 516 #define MALLOC(a, _) malloc(a)
 517 #define do_MALLOC(a, _b, _c) malloc(a)
 518 #define FREE(p) if ((unsigned long)(p) > 4096) { free(p); }
 519 #define DO_ASSERT(a) (void)(a)
 520 #define CHECK(a)
 521 #define CHECK_ACCESS(p)
 522 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v)
 523 """
 524         else:
 525             self.c_file_pfx += """
 526 extern int snprintf(char *str, size_t size, const char *format, ...);
 527 typedef int32_t ssize_t;
 528 ssize_t write(int fd, const void *buf, size_t count);
 529 #define DEBUG_PRINT(...) do { \\
 530         char debug_str[1024]; \\
 531         int s_len = snprintf(debug_str, 1023, __VA_ARGS__); \\
 532         write(2, debug_str, s_len); \\
 533 } while (0);
 534
 535 // Always run a, then assert it is true:
 536 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 537 // Assert a is true or do nothing
 538 #define CHECK(a) DO_ASSERT(a)
 539
 540 // Running a leak check across all the allocations and frees of the JDK is a mess,
 541 // so instead we implement our own naive leak checker here, relying on the -wrap
 542 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 543 // and free'd in Rust or C across the generated bindings shared library.
 544
 545 #define BT_MAX 128
 546 typedef struct allocation {
 547         struct allocation* next;
 548         void* ptr;
 549         const char* struct_name;
 550         int lineno;
 551 } allocation;
 552 static allocation* allocation_ll = NULL;
 553 static allocation* freed_ll = NULL;
 554
 555 extern void* __real_malloc(size_t len);
 556 extern void* __real_calloc(size_t nmemb, size_t len);
 557 extern void* __real_aligned_alloc(size_t alignment, size_t size);
 558 static void new_allocation(void* res, const char* struct_name, int lineno) {
 559         allocation* new_alloc = __real_malloc(sizeof(allocation));
 560         new_alloc->ptr = res;
 561         new_alloc->struct_name = struct_name;
 562         new_alloc->next = allocation_ll;
 563         new_alloc->lineno = lineno;
 564         allocation_ll = new_alloc;
 565 }
 566 static void* do_MALLOC(size_t len, const char* struct_name, int lineno) {
 567         void* res = __real_malloc(len);
 568         new_allocation(res, struct_name, lineno);
 569         return res;
 570 }
 571 #define MALLOC(len, struct_name) do_MALLOC(len, struct_name, __LINE__)
 572
 573 void __real_free(void* ptr);
 574 static void alloc_freed(void* ptr, int lineno) {
 575         allocation* p = NULL;
 576         allocation* it = allocation_ll;
 577         while (it->ptr != ptr) {
 578                 p = it; it = it->next;
 579                 if (it == NULL) {
 580                         p = NULL;
 581                         it = freed_ll;
 582                         while (it && it->ptr != ptr) { p = it; it = it->next; }
 583                         if (it == NULL) {
 584                                 DEBUG_PRINT("Tried to free unknown pointer %p at line %d.\\n", ptr, lineno);
 585                         } else {
 586                                 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);
 587                         }
 588                         abort();
 589                 }
 590         }
 591         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 592         DO_ASSERT(it->ptr == ptr);
 593         it->next = freed_ll;
 594         freed_ll = it;
 595 }
 596 static void do_FREE(void* ptr, int lineno) {
 597         if ((unsigned long)ptr <= 4096) return; // Rust loves to create pointers to the NULL page for dummys
 598         alloc_freed(ptr, lineno);
 599         __real_free(ptr);
 600 }
 601 #define FREE(ptr) do_FREE(ptr, __LINE__)
 602
 603 static void CHECK_ACCESS(const void* ptr) {
 604         allocation* it = allocation_ll;
 605         while (it->ptr != ptr) {
 606                 it = it->next;
 607                 if (it == NULL) {
 608                         return; // addrsan should catch malloc-unknown and print more info than we have
 609                 }
 610         }
 611 }
 612 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v) \\
 613         if (v.is_owned && v.inner != NULL) { \\
 614                 const void *p = __unmangle_inner_ptr(v.inner); \\
 615                 if (p != NULL) { \\
 616                         CHECK_ACCESS(p); \\
 617                 } \\
 618         }
 619
 620 void* __wrap_malloc(size_t len) {
 621         void* res = __real_malloc(len);
 622         new_allocation(res, "malloc call", 0);
 623         return res;
 624 }
 625 void* __wrap_calloc(size_t nmemb, size_t len) {
 626         void* res = __real_calloc(nmemb, len);
 627         new_allocation(res, "calloc call", 0);
 628         return res;
 629 }
 630 void* __wrap_aligned_alloc(size_t alignment, size_t size) {
 631         void* res = __real_aligned_alloc(alignment, size);
 632         new_allocation(res, "aligned_alloc call", 0);
 633         return res;
 634 }
 635 void __wrap_free(void* ptr) {
 636         if (ptr == NULL) return;
 637         alloc_freed(ptr, 0);
 638         __real_free(ptr);
 639 }
 640
 641 void* __real_realloc(void* ptr, size_t newlen);
 642 void* __wrap_realloc(void* ptr, size_t len) {
 643         if (ptr != NULL) alloc_freed(ptr, 0);
 644         void* res = __real_realloc(ptr, len);
 645         new_allocation(res, "realloc call", 0);
 646         return res;
 647 }
 648 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 649         // Rust doesn't seem to use reallocarray currently
 650         DO_ASSERT(false);
 651 }
 652
 653 uint32_t __attribute__((export_name("TS_allocs_remaining"))) allocs_remaining() {
 654         uint32_t count = 0;
 655         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 656                 count++;
 657         }
 658         return count;
 659 }
 660 void __attribute__((export_name("TS_print_leaks"))) print_leaks() {
 661         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 662                 DEBUG_PRINT("%s %p remains. Allocated on line %d\\n", a->struct_name, a->ptr, a->lineno);
 663         }
 664 }
 665 """
 666         self.c_file_pfx = self.c_file_pfx + """
 667 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 668 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 669 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 670 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 671
 672 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 673
 674 #define DECL_ARR_TYPE(ty, name) \\
 675         struct name##array { \\
 676                 uint64_t arr_len; /* uint32_t would suffice but we want to align uint64_ts as well */ \\
 677                 ty elems[]; \\
 678         }; \\
 679         typedef struct name##array * name##Array; \\
 680         static inline name##Array init_##name##Array(size_t arr_len, int lineno) { \\
 681                 name##Array arr = (name##Array)do_MALLOC(arr_len * sizeof(ty) + sizeof(uint64_t), #name" array init", lineno); \\
 682                 arr->arr_len = arr_len; \\
 683                 return arr; \\
 684         }
 685
 686 DECL_ARR_TYPE(int64_t, int64_t);
 687 DECL_ARR_TYPE(uint64_t, uint64_t);
 688 DECL_ARR_TYPE(int8_t, int8_t);
 689 DECL_ARR_TYPE(int16_t, int16_t);
 690 DECL_ARR_TYPE(uint32_t, uint32_t);
 691 DECL_ARR_TYPE(void*, ptr);
 692 DECL_ARR_TYPE(char, char);
 693 typedef charArray jstring;
 694
 695 static inline jstring str_ref_to_ts(const char* chars, size_t len) {
 696         charArray arr = init_charArray(len, __LINE__);
 697         memcpy(arr->elems, chars, len);
 698         return arr;
 699 }
 700 static inline LDKStr str_ref_to_owned_c(const jstring str) {
 701         char* newchars = MALLOC(str->arr_len + 1, "String chars");
 702         memcpy(newchars, str->elems, str->arr_len);
 703         newchars[str->arr_len] = 0;
 704         LDKStr res = {
 705                 .chars = newchars,
 706                 .len = str->arr_len,
 707                 .chars_is_owned = true
 708         };
 709         return res;
 710 }
 711
 712 typedef bool jboolean;
 713
 714 uint32_t __attribute__((export_name("TS_malloc"))) TS_malloc(uint32_t size) {
 715         return (uint32_t)MALLOC(size, "JS-Called malloc");
 716 }
 717 void __attribute__((export_name("TS_free"))) TS_free(uint32_t ptr) {
 718         FREE((void*)ptr);
 719 }
 720
 721 jstring __attribute__((export_name("TS_get_ldk_c_bindings_version"))) TS_get_ldk_c_bindings_version() {
 722         const char *res = check_get_ldk_bindings_version();
 723         if (res == NULL) return NULL;
 724         return str_ref_to_ts(res, strlen(res));
 725 }
 726 jstring __attribute__((export_name("TS_get_ldk_version"))) get_ldk_version() {
 727         const char *res = check_get_ldk_version();
 728         if (res == NULL) return NULL;
 729         return str_ref_to_ts(res, strlen(res));
 730 }
 731 #include "version.c"
 732 """
 733
 734         self.c_version_file = """jstring __attribute__((export_name("TS_get_lib_version_string"))) TS_get_lib_version_string() {
 735         return str_ref_to_ts("<git_version_ldk_garbagecollected>", strlen("<git_version_ldk_garbagecollected>"));
 736 }"""
 737
 738         self.hu_struct_file_prefix = """
 739 import { CommonBase, UInt5, WitnessVersion, UnqualifiedError } from './CommonBase.mjs';
 740 import * as bindings from '../bindings.mjs'
 741
 742 """
 743         self.hu_struct_file_suffix = ""
 744         self.util_fn_pfx = self.hu_struct_file_prefix + "\nexport class UtilMethods extends CommonBase {\n"
 745         self.util_fn_sfx = "}"
 746         self.c_fn_ty_pfx = ""
 747         self.file_ext = ".mts"
 748         self.ptr_c_ty = "uint64_t"
 749         self.ptr_native_ty = "bigint"
 750         self.u128_native_ty = "bigint"
 751         self.usize_c_ty = "uint32_t"
 752         self.usize_native_ty = "number"
 753         self.native_zero_ptr = "0n"
 754         self.result_c_ty = "uint32_t"
 755         self.ptr_arr = "ptrArray"
 756         self.is_arr_some_check = ("", " != 0")
 757         self.get_native_arr_len_call = ("", "->arr_len")
 758
 759     def bindings_footer(self):
 760         return ""
 761
 762     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 763         return None
 764     def create_native_arr_call(self, arr_len, ty_info):
 765         if ty_info.c_ty == "ptrArray":
 766             assert ty_info.rust_obj == "LDKCVec_U5Z" or (ty_info.subty is not None and (ty_info.subty.c_ty.endswith("Array") or ty_info.subty.rust_obj == "LDKStr"))
 767         return "init_" + ty_info.c_ty + "(" + arr_len + ", __LINE__)"
 768     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 769         if ty_info.c_ty == "int8_tArray":
 770             return ("memcpy(" + arr_name + "->elems, ", ", " + arr_len + ")")
 771         elif ty_info.c_ty == "int16_tArray":
 772             return ("memcpy(" + arr_name + "->elems, ", ", " + arr_len + " * 2)")
 773         else:
 774             assert False
 775     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 776         if ty_info.c_ty == "int8_tArray" or ty_info.c_ty == "int16_tArray":
 777             if copy:
 778                 byte_len = arr_len
 779                 if ty_info.c_ty == "int16_tArray":
 780                     byte_len = arr_len + " * 2"
 781                 return "memcpy(" + dest_name + ", " + arr_name + "->elems, " + byte_len + "); FREE(" + arr_name + ")"
 782         assert not copy
 783         if ty_info.c_ty == "ptrArray":
 784             return "(void*) " + arr_name + "->elems"
 785         else:
 786             return arr_name + "->elems"
 787     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 788         assert False # Only called if above is None
 789     def get_native_arr_ptr_call(self, ty_info):
 790         if ty_info.subty is not None:
 791             return "(" + ty_info.subty.c_ty + "*)(((uint8_t*)", ") + 8)"
 792         return "(" + ty_info.c_ty + "*)(((uint8_t*)", ") + 8)"
 793     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 794         return None
 795     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 796         if ty_info.c_ty == "int8_tArray":
 797             return "FREE(" + arr_name + ");"
 798         else:
 799             return "FREE(" + arr_name + ")"
 800
 801     def map_hu_array_elems(self, arr_name, conv_name, arr_ty, elem_ty):
 802         if elem_ty.rust_obj == "LDKU5":
 803             return arr_name + " != null ? bindings.uint5ArrToBytes(" + arr_name + ") : null"
 804         assert elem_ty.c_ty == "uint64_t" or elem_ty.c_ty.endswith("Array") or elem_ty.rust_obj == "LDKStr"
 805         return arr_name + " != null ? " + arr_name + ".map(" + conv_name + " => " + elem_ty.from_hu_conv[0] + ") : null"
 806
 807     def str_ref_to_native_call(self, var_name, str_len):
 808         return "str_ref_to_ts(" + var_name + ", " + str_len + ")"
 809     def str_ref_to_c_call(self, var_name):
 810         return "str_ref_to_owned_c(" + var_name + ")"
 811     def str_to_hu_conv(self, var_name):
 812         return "const " + var_name + "_conv: string = bindings.decodeString(" + var_name + ");"
 813     def str_from_hu_conv(self, var_name):
 814         return ("bindings.encodeString(" + var_name + ")", "")
 815
 816     def c_fn_name_define_pfx(self, fn_name, have_args):
 817         return " __attribute__((export_name(\"TS_" + fn_name + "\"))) TS_" + fn_name + "("
 818
 819     def init_str(self):
 820         return ""
 821
 822     def get_java_arr_len(self, arr_name):
 823         return "bindings.getArrayLength(" + arr_name + ")"
 824     def get_java_arr_elem(self, elem_ty, arr_name, idx):
 825         if elem_ty.c_ty.endswith("Array") or elem_ty.c_ty == "uintptr_t":
 826             return "bindings.getU32ArrayElem(" + arr_name + ", " + idx + ")"
 827         elif elem_ty.c_ty == "uint64_t":
 828             return "bindings.getU64ArrayElem(" + arr_name + ", " + idx + ")"
 829         elif elem_ty.rust_obj == "LDKU5":
 830             return "bindings.getU8ArrayElem(" + arr_name + ", " + idx + ")"
 831         elif elem_ty.rust_obj == "LDKStr":
 832             return "bindings.getU32ArrayElem(" + arr_name + ", " + idx + ")"
 833         else:
 834             assert False
 835     def constr_hu_array(self, ty_info, arr_len):
 836         return "new Array(" + arr_len + ").fill(null)"
 837     def cleanup_converted_native_array(self, ty_info, arr_name):
 838         return "bindings.freeWasmMemory(" + arr_name + ")"
 839
 840     def primitive_arr_from_hu(self, arr_ty, fixed_len, arr_name):
 841         mapped_ty = arr_ty.subty
 842         inner = arr_name
 843         if arr_ty.rust_obj == "LDKU128":
 844             return ("bindings.encodeUint128(" + inner + ")", "")
 845         if fixed_len is not None:
 846             if mapped_ty.c_ty == "int8_t":
 847                 inner = "bindings.check_arr_len(" + arr_name + ", " + fixed_len + ")"
 848             elif mapped_ty.c_ty == "int16_t":
 849                 inner = "bindings.check_16_arr_len(" + arr_name + ", " + fixed_len + ")"
 850         if mapped_ty.c_ty.endswith("Array"):
 851             return ("bindings.encodeUint32Array(" + inner + ")", "")
 852         elif mapped_ty.c_ty == "uint8_t" or mapped_ty.c_ty == "int8_t":
 853             return ("bindings.encodeUint8Array(" + inner + ")", "")
 854         elif mapped_ty.c_ty == "uint16_t" or mapped_ty.c_ty == "int16_t":
 855             return ("bindings.encodeUint16Array(" + inner + ")", "")
 856         elif mapped_ty.c_ty == "uint32_t":
 857             return ("bindings.encodeUint32Array(" + inner + ")", "")
 858         elif mapped_ty.c_ty == "int64_t" or mapped_ty.c_ty == "uint64_t":
 859             return ("bindings.encodeUint64Array(" + inner + ")", "")
 860         elif mapped_ty.rust_obj == "LDKStr":
 861             return ("XXX-unused", "")
 862         else:
 863             print(mapped_ty.c_ty)
 864             assert False
 865
 866     def primitive_arr_to_hu(self, arr_ty, fixed_len, arr_name, conv_name):
 867         mapped_ty = arr_ty.subty
 868         if arr_ty.rust_obj == "LDKU128":
 869             return "const " + conv_name + ": bigint = bindings.decodeUint128(" + arr_name + ");"
 870         elif mapped_ty.c_ty == "uint8_t" or mapped_ty.c_ty == "int8_t":
 871             return "const " + conv_name + ": Uint8Array = bindings.decodeUint8Array(" + arr_name + ");"
 872         elif mapped_ty.c_ty == "uint16_t" or mapped_ty.c_ty == "int16_t":
 873             return "const " + conv_name + ": Uint16Array = bindings.decodeUint16Array(" + arr_name + ");"
 874         elif mapped_ty.c_ty == "uint64_t" or mapped_ty.c_ty == "int64_t":
 875             return "const " + conv_name + ": bigint[] = bindings.decodeUint64Array(" + arr_name + ");"
 876         else:
 877             assert False
 878
 879     def var_decl_statement(self, ty_string, var_name, statement):
 880         return "const " + var_name + ": " + ty_string + " = " + statement
 881
 882     def java_arr_ty_str(self, elem_ty_str):
 883         return "number"
 884
 885     def for_n_in_range(self, n, minimum, maximum):
 886         return "for (var " + n + " = " + minimum + "; " + n + " < " + maximum + "; " + n + "++) {"
 887     def for_n_in_arr(self, n, arr_name, arr_elem_ty):
 888         return (arr_name + ".forEach((" + n + ": " + arr_elem_ty.java_hu_ty + ") => { ", " })")
 889
 890     def get_ptr(self, var):
 891         return "CommonBase.get_ptr_of(" + var + ")"
 892     def set_null_skip_free(self, var):
 893         return "CommonBase.set_null_skip_free(" + var + ");"
 894
 895     def add_ref(self, holder, referent):
 896         return "CommonBase.add_ref_from(" + holder + ", " + referent + ")"
 897
 898     def obj_defined(self, struct_names, folder):
 899         with open(self.outdir + "/index.mts", 'a') as index:
 900             index.write(f"export * from './{folder}/{struct_names[0]}.mjs';\n")
 901         with open(self.outdir + "/imports.mts.part", 'a') as imports:
 902             imports.write(f"import {{ {', '.join(struct_names)} }} from '../{folder}/{struct_names[0]}.mjs';\n")
 903
 904     def fully_qualified_hu_ty_path(self, ty):
 905         return ty.java_hu_ty
 906
 907     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 908         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_js(int32_t ord) {\n"
 909         out_c = out_c + "\tswitch (ord) {\n"
 910         ord_v = 0
 911
 912         out_typescript_enum_fields = ""
 913
 914         for var, var_docs in variants:
 915             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 916             ord_v = ord_v + 1
 917             if var_docs is not None:
 918                 var_docs_repld = var_docs.replace("\n", "\n\t")
 919                 out_typescript_enum_fields += f"/**\n\t * {var_docs_repld}\n\t */\n"
 920             out_typescript_enum_fields += f"\t{var},\n\t"
 921         out_c = out_c + "\t}\n"
 922         out_c = out_c + "\tabort();\n"
 923         out_c = out_c + "}\n"
 924
 925         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_js(LDK" + struct_name + " val) {\n"
 926         out_c = out_c + "\tswitch (val) {\n"
 927         ord_v = 0
 928         for var, _ in variants:
 929             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 930             ord_v = ord_v + 1
 931         out_c = out_c + "\t\tdefault: abort();\n"
 932         out_c = out_c + "\t}\n"
 933         out_c = out_c + "}\n"
 934
 935         # Note that this is *not* marked /* @internal */ as we re-expose it directly in enums/
 936         enum_comment_formatted = enum_doc_comment.replace("\n", "\n * ")
 937         out_typescript = f"""
 938 /**
 939  * {enum_comment_formatted}
 940  */
 941 export enum {struct_name} {{
 942         {out_typescript_enum_fields}
 943 }}
 944 """
 945         out_typescript_enum = f"export {{ {struct_name} }} from \"../bindings.mjs\";"
 946         self.obj_defined([struct_name], "enums")
 947         return (out_c, out_typescript_enum, out_typescript)
 948
 949     def c_unitary_enum_to_native_call(self, ty_info):
 950         return (ty_info.rust_obj + "_to_js(", ")")
 951     def native_unitary_enum_to_c_call(self, ty_info):
 952         return (ty_info.rust_obj + "_from_js(", ")")
 953
 954     def native_c_map_trait(self, struct_name, field_var_conversions, flattened_field_var_conversions, field_function_lines, trait_doc_comment):
 955         out_typescript_bindings = ""
 956         super_instantiator = ""
 957         bindings_instantiator = ""
 958         pointer_to_adder = ""
 959         impl_constructor_arguments = ""
 960         for var in flattened_field_var_conversions:
 961             if isinstance(var, ConvInfo):
 962                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 963                 super_instantiator += first_to_lower(var.arg_name) + ", "
 964                 if var.from_hu_conv is not None:
 965                     bindings_instantiator += ", " + var.from_hu_conv[0]
 966                     if var.from_hu_conv[1] != "":
 967                         pointer_to_adder += "\t\t\t" + var.from_hu_conv[1] + ";\n"
 968                 else:
 969                     bindings_instantiator += ", " + first_to_lower(var.arg_name)
 970             else:
 971                 bindings_instantiator += ", " + first_to_lower(var[1]) + ".instance_idx!"
 972                 super_instantiator += first_to_lower(var[1]) + "_impl, "
 973                 pointer_to_adder += "\t\timpl_holder.held.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 974                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}Interface"
 975
 976         super_constructor_statements = ""
 977         trait_constructor_arguments = ""
 978         for var in field_var_conversions:
 979             if isinstance(var, ConvInfo):
 980                 trait_constructor_arguments += ", " + var.arg_name
 981             else:
 982                 super_constructor_statements += "\t\tconst " + first_to_lower(var[1]) + " = " + var[1] + ".new_impl(" + super_instantiator + ");\n"
 983                 trait_constructor_arguments += ", " + first_to_lower(var[1]) + ".instance_idx!"
 984                 for suparg in var[2]:
 985                     if isinstance(suparg, ConvInfo):
 986                         trait_constructor_arguments += ", " + suparg.arg_name
 987                     else:
 988                         # Blindly assume that we can just strip the first arg to build the args for the supertrait
 989                         super_constructor_statements += "\t\tconst " + first_to_lower(suparg[1]) + " = " + suparg[1] + ".new_impl(" + super_instantiator.split(", ", 1)[1] + ");\n"
 990                         trait_constructor_arguments += ", " + suparg[1]
 991
 992         # BUILD INTERFACE METHODS
 993         out_java_interface = ""
 994         out_interface_implementation_overrides = ""
 995         java_methods = []
 996         for fn_line in field_function_lines:
 997             java_method_descriptor = ""
 998             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 999                 out_java_interface += "\t/**" + fn_line.docs.replace("\n", "\n\t * ") + "\n\t */\n"
1000                 out_java_interface += "\t" + fn_line.fn_name + "("
1001                 out_interface_implementation_overrides += f"\t\t\t{fn_line.fn_name} ("
1002
1003                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
1004                     if idx >= 1:
1005                         out_java_interface += ", "
1006                         out_interface_implementation_overrides += ", "
1007                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
1008                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
1009                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
1010                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n"
1011                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
1012                 java_methods.append((fn_line.fn_name, java_method_descriptor))
1013
1014                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
1015
1016                 for arg_info in fn_line.args_ty:
1017                     if arg_info.to_hu_conv is not None:
1018                         out_interface_implementation_overrides += "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
1019
1020                 if fn_line.ret_ty_info.java_ty != "void":
1021                     out_interface_implementation_overrides += "\t\t\t\tconst ret: " + fn_line.ret_ty_info.java_hu_ty + " = arg." + fn_line.fn_name + "("
1022                 else:
1023                     out_interface_implementation_overrides += f"\t\t\t\targ." + fn_line.fn_name + "("
1024
1025                 for idx, arg_info in enumerate(fn_line.args_ty):
1026                     if idx != 0:
1027                         out_interface_implementation_overrides += ", "
1028                     if arg_info.to_hu_conv_name is not None:
1029                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
1030                     else:
1031                         out_interface_implementation_overrides += arg_info.arg_name
1032
1033                 out_interface_implementation_overrides += ");\n"
1034                 if fn_line.ret_ty_info.java_ty != "void":
1035                     if fn_line.ret_ty_info.from_hu_conv is not None:
1036                         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"
1037                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
1038                             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"
1039                         #if fn_line.ret_ty_info.rust_obj in result_types:
1040                         # XXX: We need to handle this in conversion logic so that its cross-language!
1041                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
1042                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
1043                         out_interface_implementation_overrides += "\t\t\t\treturn result;\n"
1044                     else:
1045                         out_interface_implementation_overrides += "\t\t\t\treturn ret;\n"
1046                 out_interface_implementation_overrides += f"\t\t\t}},\n"
1047
1048         formatted_trait_docs = trait_doc_comment.replace("\n", "\n * ")
1049         out_typescript_human = f"""
1050 {self.hu_struct_file_prefix}
1051
1052 /** An implementation of {struct_name.replace("LDK","")} */
1053 export interface {struct_name.replace("LDK", "")}Interface {{
1054 {out_java_interface}}}
1055
1056 class {struct_name}Holder {{
1057         held: {struct_name.replace("LDK", "")}|null = null;
1058 }}
1059
1060 /**
1061  * {formatted_trait_docs}
1062  */
1063 export class {struct_name.replace("LDK","")} extends CommonBase {{
1064         /* @internal */
1065         public bindings_instance: bindings.{struct_name}|null;
1066
1067         /* @internal */
1068         public instance_idx?: number;
1069
1070         /* @internal */
1071         constructor(_dummy: null, ptr: bigint) {{
1072                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1073                 this.bindings_instance = null;
1074         }}
1075
1076         /** Creates a new instance of {struct_name.replace("LDK","")} from a given implementation */
1077         public static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
1078                 const impl_holder: {struct_name}Holder = new {struct_name}Holder();
1079                 let structImplementation = {{
1080 {out_interface_implementation_overrides}                }} as bindings.{struct_name};
1081 {super_constructor_statements}          const ptr_idx: [bigint, number] = bindings.{struct_name}_new(structImplementation{bindings_instantiator});
1082
1083                 impl_holder.held = new {struct_name.replace("LDK", "")}(null, ptr_idx[0]);
1084                 impl_holder.held.instance_idx = ptr_idx[1];
1085                 impl_holder.held.bindings_instance = structImplementation;
1086 {pointer_to_adder}              return impl_holder.held!;
1087         }}
1088
1089 """
1090         self.obj_defined([struct_name.replace("LDK", ""), struct_name.replace("LDK", "") + "Interface"], "structs")
1091
1092         out_typescript_bindings += "/* @internal */\nexport interface " + struct_name + " {\n"
1093         java_meths = []
1094         for fn_line in field_function_lines:
1095             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
1096                 out_typescript_bindings += f"\t{fn_line.fn_name} ("
1097
1098                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
1099                     if idx >= 1:
1100                         out_typescript_bindings = out_typescript_bindings + ", "
1101                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
1102
1103                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
1104
1105         out_typescript_bindings += "}\n\n"
1106
1107         c_call_extra_args = ""
1108         out_typescript_bindings += f"/* @internal */\nexport function {struct_name}_new(impl: {struct_name}"
1109         for var in flattened_field_var_conversions:
1110             if isinstance(var, ConvInfo):
1111                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
1112                 c_call_extra_args += f", {var.arg_name}"
1113             else:
1114                 out_typescript_bindings += f", {var[1]}: number"
1115                 c_call_extra_args += f", {var[1]}"
1116
1117
1118         out_typescript_bindings += f"""): [bigint, number] {{
1119         if(!isWasmInitialized) {{
1120                 throw new Error("initializeWasm() must be awaited first!");
1121         }}
1122         var new_obj_idx = js_objs.length;
1123         for (var i = 0; i < js_objs.length; i++) {{
1124                 if (js_objs[i] == null || js_objs[i] == undefined) {{ new_obj_idx = i; break; }}
1125         }}
1126         js_objs[i] = new WeakRef(impl);
1127         return [wasm.TS_{struct_name}_new(i{c_call_extra_args}), i];
1128 }}
1129 """
1130
1131         # Now that we've written out our java code (and created java_meths), generate C
1132         out_c = "typedef struct " + struct_name + "_JCalls {\n"
1133         out_c += "\tatomic_size_t refcnt;\n"
1134         out_c += "\tuint32_t instance_ptr;\n"
1135         for var in flattened_field_var_conversions:
1136             if isinstance(var, ConvInfo):
1137                 # We're a regular ol' field
1138                 pass
1139             else:
1140                 # We're a supertrait
1141                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
1142         out_c = out_c + "} " + struct_name + "_JCalls;\n"
1143
1144         for fn_line in field_function_lines:
1145             if fn_line.fn_name == "free":
1146                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
1147                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
1148                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
1149                 out_c = out_c + "\t\tFREE(j_calls);\n"
1150                 out_c = out_c + "\t}\n}\n"
1151
1152         for idx, fn_line in enumerate(field_function_lines):
1153             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
1154                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
1155                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
1156                 if fn_line.self_is_const:
1157                     out_c = out_c + "const void* this_arg"
1158                 else:
1159                     out_c = out_c + "void* this_arg"
1160
1161                 for idx, arg in enumerate(fn_line.args_ty):
1162                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
1163
1164                 out_c = out_c + ") {\n"
1165                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
1166
1167                 for arg_info in fn_line.args_ty:
1168                     if arg_info.ret_conv is not None:
1169                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
1170                         out_c = out_c + arg_info.arg_name
1171                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
1172
1173                 fn_suffix = ""
1174                 assert len(fn_line.args_ty) < 7
1175                 for arg_info in fn_line.args_ty:
1176                     if arg_info.c_ty == "uint64_t" or arg_info.c_ty == "int64_t":
1177                         fn_suffix += "b"
1178                     else:
1179                         fn_suffix += "u"
1180                 for i in range(0, 6 - len(fn_line.args_ty)):
1181                     fn_suffix += "u"
1182                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
1183                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (" + fn_line.ret_ty_info.c_ty + ")"
1184                     out_c += "js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1185                 elif fn_line.ret_ty_info.java_ty == "void":
1186                     out_c = out_c + "\tjs_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1187                 elif fn_line.ret_ty_info.java_hu_ty == "string":
1188                     out_c += "\tjstring ret = (jstring)js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1189                 elif fn_line.ret_ty_info.arg_conv is None:
1190                     out_c += "\treturn js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1191                 else:
1192                     out_c += "\tuint64_t ret = js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1193
1194                 self.function_ptrs[self.function_ptr_counter] = (struct_name, fn_line.fn_name)
1195                 self.function_ptr_counter += 1
1196
1197                 for idx, arg_info in enumerate(fn_line.args_ty):
1198                     if arg_info.ret_conv is not None:
1199                         if arg_info.c_ty.endswith("Array"):
1200                             out_c += ", (uint32_t)" + arg_info.ret_conv_name
1201                         else:
1202                             out_c += ", " + arg_info.ret_conv_name
1203                     else:
1204                         assert False # TODO: Would we need some conversion here?
1205                         out_c += ", (uint32_t)" + arg_info.arg_name
1206                 for i in range(0, 6 - len(fn_line.args_ty)):
1207                     out_c += ", 0"
1208                 out_c = out_c + ");\n"
1209                 if fn_line.ret_ty_info.arg_conv is not None:
1210                     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"
1211
1212                 out_c = out_c + "}\n"
1213
1214         # Write out a clone function whether we need one or not, as we use them in moving to rust
1215         out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
1216         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
1217         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
1218         for var in flattened_field_var_conversions:
1219             if not isinstance(var, ConvInfo):
1220                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[2].replace(".", "->") + "->refcnt, 1, memory_order_release);\n"
1221         out_c = out_c + "}\n"
1222
1223         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (JSValue o"
1224         for var in flattened_field_var_conversions:
1225             if isinstance(var, ConvInfo):
1226                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
1227             else:
1228                 out_c = out_c + ", JSValue " + var[1]
1229         out_c = out_c + ") {\n"
1230
1231         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
1232         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
1233         out_c = out_c + "\tcalls->instance_ptr = o;\n"
1234
1235         for (fn_name, java_meth_descr) in java_meths:
1236             if fn_name != "free" and fn_name != "cloned":
1237                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
1238                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
1239
1240         for var in flattened_field_var_conversions:
1241             if isinstance(var, ConvInfo) and var.arg_conv is not None:
1242                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
1243         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
1244         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
1245         for fn_line in field_function_lines:
1246             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
1247                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
1248             elif fn_line.fn_name == "free":
1249                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
1250             else:
1251                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
1252         for var in field_var_conversions:
1253             if isinstance(var, ConvInfo):
1254                 if var.arg_conv_name is not None:
1255                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
1256                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
1257                 else:
1258                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
1259                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
1260             else:
1261                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(" + var[1]
1262                 for suparg in var[2]:
1263                     if isinstance(suparg, ConvInfo):
1264                         out_c += ", " + suparg.arg_name
1265                     else:
1266                         out_c += ", " + suparg[1]
1267                 out_c += "),\n"
1268         out_c = out_c + "\t};\n"
1269         for var in flattened_field_var_conversions:
1270             if not isinstance(var, ConvInfo):
1271                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[2] + ".this_arg;\n"
1272         out_c = out_c + "\treturn ret;\n"
1273         out_c = out_c + "}\n"
1274
1275         out_c = out_c + self.c_fn_ty_pfx + "uint64_t " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "JSValue o"
1276         for var in flattened_field_var_conversions:
1277             if isinstance(var, ConvInfo):
1278                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
1279             else:
1280                 out_c = out_c + ", JSValue " + var[1]
1281         out_c = out_c + ") {\n"
1282         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
1283         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(o"
1284         for var in flattened_field_var_conversions:
1285             if isinstance(var, ConvInfo):
1286                 out_c = out_c + ", " + var.arg_name
1287             else:
1288                 out_c = out_c + ", " + var[1]
1289         out_c = out_c + ");\n"
1290         out_c = out_c + "\treturn tag_ptr(res_ptr, true);\n"
1291         out_c = out_c + "}\n"
1292
1293         return (out_typescript_bindings, out_typescript_human, out_c)
1294
1295     def trait_struct_inc_refcnt(self, ty_info):
1296         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
1297         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
1298         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_cloned(&" + ty_info.var_name + "_conv);\n}"
1299         return base_conv
1300
1301     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
1302         bindings_type = struct_name.replace("LDK", "")
1303         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
1304
1305         out_java_enum = ""
1306         out_java = ""
1307         out_c = ""
1308
1309         out_java_enum += (self.hu_struct_file_prefix)
1310
1311         java_hu_class = "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
1312         java_hu_class += "export class " + java_hu_type + " extends CommonBase {\n"
1313         java_hu_class += "\tprotected constructor(_dummy: null, ptr: bigint) { super(ptr, bindings." + bindings_type + "_free); }\n"
1314         java_hu_class += "\t/* @internal */\n"
1315         java_hu_class += f"\tpublic static constr_from_ptr(ptr: bigint): {java_hu_type} {{\n"
1316         java_hu_class += f"\t\tconst raw_ty: number = bindings." + struct_name + "_ty_from_ptr(ptr);\n"
1317         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"
1318         out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)untag_ptr(ptr);\n"
1319         out_c += "\tswitch(obj->tag) {\n"
1320         java_hu_class += "\t\tswitch (raw_ty) {\n"
1321         java_hu_subclasses = ""
1322
1323         out_java += "/* @internal */\nexport class " + struct_name + " {\n"
1324         out_java += "\tprotected constructor() {}\n"
1325         var_idx = 0
1326         for var in variant_list:
1327             java_hu_subclasses += "/** A " + java_hu_type + " of type " + var.var_name + " */\n"
1328             java_hu_subclasses += "export class " + java_hu_type + "_" + var.var_name + " extends " + java_hu_type + " {\n"
1329             java_hu_class += f"\t\t\tcase {var_idx}: "
1330             java_hu_class += "return new " + java_hu_type + "_" + var.var_name + "(ptr);\n"
1331             out_c += f"\t\tcase {struct_name}_{var.var_name}: return {var_idx};\n"
1332             hu_conv_body = ""
1333             for idx, (field_ty, field_docs) in enumerate(var.fields):
1334                 if field_docs is not None:
1335                     java_hu_subclasses += "\t/**\n\t * " + field_docs.replace("\n", "\n\t * ") + "\n\t */\n"
1336                 java_hu_subclasses += "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
1337                 if field_ty.to_hu_conv is not None:
1338                     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"
1339                     hu_conv_body += f"\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1340                     hu_conv_body += f"\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1341                 else:
1342                     hu_conv_body += f"\t\tthis.{field_ty.arg_name} = bindings.{struct_name}_{var.var_name}_get_{field_ty.arg_name}(ptr);\n"
1343             java_hu_subclasses += "\t/* @internal */\n"
1344             java_hu_subclasses += "\tpublic constructor(ptr: bigint) {\n\t\tsuper(null, ptr);\n"
1345             java_hu_subclasses = java_hu_subclasses + hu_conv_body
1346             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
1347             var_idx += 1
1348         out_java += "}\n"
1349         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"
1350         out_java += self.fn_call_body(struct_name + "_ty_from_ptr", "uint32_t", "number", "ptr: bigint", "ptr")
1351         out_c += ("\t\tdefault: abort();\n")
1352         out_c += ("\t}\n}\n")
1353
1354         for var in variant_list:
1355             for idx, (field_map, _) in enumerate(var.fields):
1356                 fn_name = f"{struct_name}_{var.var_name}_get_{field_map.arg_name}"
1357                 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"
1358                 out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)untag_ptr(ptr);\n"
1359                 out_c += f"\tassert(obj->tag == {struct_name}_{var.var_name});\n"
1360                 if field_map.ret_conv is not None:
1361                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1362                     if var.tuple_variant:
1363                         out_c += "obj->" + camel_to_snake(var.var_name)
1364                     else:
1365                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
1366                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1367                     out_c += "\treturn " + field_map.ret_conv_name + ";\n"
1368                 else:
1369                     if var.tuple_variant:
1370                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + ";\n"
1371                     else:
1372                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name + ";\n"
1373                 out_c += "}\n"
1374                 out_java += self.fn_call_body(fn_name, field_map.c_ty, field_map.java_ty, "ptr: bigint", "ptr")
1375         out_java_enum += java_hu_class
1376         self.struct_file_suffixes[java_hu_type] = java_hu_subclasses
1377         self.obj_defined([java_hu_type], "structs")
1378         return (out_java, out_java_enum, out_c)
1379
1380     def map_opaque_struct(self, struct_name, struct_doc_comment):
1381         method_header = ""
1382
1383         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
1384         out_opaque_struct_human = f"{self.hu_struct_file_prefix}"
1385         constructor_body = "super(ptr, bindings." + struct_name.replace("LDK","") + "_free);"
1386         extra_docs = ""
1387         extra_body = ""
1388         if struct_name.startswith("LDKLocked") or struct_name.startswith("LDKReadOnly"):
1389             extra_docs = "\n * This type represents a lock and MUST BE MANUALLY FREE'd!"
1390             constructor_body = 'super(ptr, () => { throw new Error("Locks must be manually freed with free()"); });'
1391             extra_body = f"""
1392         /** Releases this lock */
1393         public free() {{
1394                 bindings.{struct_name.replace("LDK","")}_free(this.ptr);
1395                 CommonBase.set_null_skip_free(this);
1396         }}"""
1397         formatted_doc_comment = struct_doc_comment.replace("\n", "\n * ")
1398         out_opaque_struct_human += f"""
1399 /**{extra_docs}
1400  * {formatted_doc_comment}
1401  */
1402 export class {hu_name} extends CommonBase {{
1403         /* @internal */
1404         public constructor(_dummy: null, ptr: bigint) {{
1405                 {constructor_body}
1406         }}{extra_body}
1407
1408 """
1409         self.obj_defined([hu_name], "structs")
1410         return out_opaque_struct_human
1411
1412     def map_tuple(self, struct_name):
1413         return self.map_opaque_struct(struct_name, "A Tuple")
1414
1415     def map_result(self, struct_name, res_map, err_map):
1416         human_ty = struct_name.replace("LDKCResult", "Result")
1417
1418         suffixes = f"export class {human_ty}_OK extends {human_ty} {{\n"
1419         if res_map.java_hu_ty != "void":
1420             suffixes += "\tpublic res: " + res_map.java_hu_ty + ";\n"
1421         suffixes += f"""
1422         /* @internal */
1423         public constructor(_dummy: null, ptr: bigint) {{
1424                 super(_dummy, ptr);
1425 """
1426         if res_map.java_hu_ty == "void":
1427             pass
1428         elif res_map.to_hu_conv is not None:
1429             suffixes += "\t\tconst res: " + res_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1430             suffixes += "\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t")
1431             suffixes += "\n\t\tthis.res = " + res_map.to_hu_conv_name + ";\n"
1432         else:
1433             suffixes += "\t\tthis.res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1434         suffixes += "\t}\n}\n"
1435
1436         suffixes += f"export class {human_ty}_Err extends {human_ty} {{\n"
1437         if err_map.java_hu_ty != "void":
1438             suffixes += "\tpublic err: " + err_map.java_hu_ty + ";\n"
1439         suffixes += f"""
1440         /* @internal */
1441         public constructor(_dummy: null, ptr: bigint) {{
1442                 super(_dummy, ptr);
1443 """
1444         if err_map.java_hu_ty == "void":
1445             pass
1446         elif err_map.to_hu_conv is not None:
1447             suffixes += "\t\tconst err: " + err_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1448             suffixes += "\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t")
1449             suffixes += "\n\t\tthis.err = " + err_map.to_hu_conv_name + ";\n"
1450         else:
1451             suffixes += "\t\tthis.err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1452         suffixes += "\t}\n}"
1453
1454         self.struct_file_suffixes[human_ty] = suffixes
1455         self.obj_defined([human_ty], "structs")
1456
1457         return f"""{self.hu_struct_file_prefix}
1458
1459 export class {human_ty} extends CommonBase {{
1460         protected constructor(_dummy: null, ptr: bigint) {{
1461                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1462         }}
1463         /* @internal */
1464         public static constr_from_ptr(ptr: bigint): {human_ty} {{
1465                 if (bindings.{struct_name.replace("LDK", "")}_is_ok(ptr)) {{
1466                         return new {human_ty}_OK(null, ptr);
1467                 }} else {{
1468                         return new {human_ty}_Err(null, ptr);
1469                 }}
1470         }}
1471 """
1472
1473     def fn_call_body(self, method_name, return_c_ty, return_java_ty, method_argument_string, native_call_argument_string):
1474         has_return_value = return_c_ty != 'void'
1475         return_statement = 'return nativeResponseValue;'
1476         if not has_return_value:
1477             return_statement = '// debug statements here'
1478
1479         return f"""/* @internal */
1480 export function {method_name}({method_argument_string}): {return_java_ty} {{
1481         if(!isWasmInitialized) {{
1482                 throw new Error("initializeWasm() must be awaited first!");
1483         }}
1484         const nativeResponseValue = wasm.TS_{method_name}({native_call_argument_string});
1485         {return_statement}
1486 }}
1487 """
1488     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):
1489         out_java = ""
1490         out_c = ""
1491         out_java_struct = None
1492
1493         out_java += ("\t")
1494         out_c += (self.c_fn_ty_pfx)
1495         out_c += (return_type_info.c_ty)
1496         out_java += (return_type_info.java_ty)
1497         if return_type_info.ret_conv is not None:
1498             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1499         out_java += (" " + method_name + "(")
1500         out_c += (" "  + self.c_fn_name_define_pfx(method_name, True))
1501
1502         method_argument_string = ""
1503         native_call_argument_string = ""
1504         for idx, arg_conv_info in enumerate(argument_types):
1505             if idx != 0:
1506                 method_argument_string += (", ")
1507                 native_call_argument_string += ', '
1508                 out_c += (", ")
1509             if arg_conv_info.c_ty != "void":
1510                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1511                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
1512                 native_call_argument_string += arg_conv_info.arg_name
1513         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)
1514
1515         out_java_struct = ""
1516         if doc_comment is not None:
1517             out_java_struct = "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
1518
1519         if not args_known:
1520             out_java_struct += ("\t// Skipped " + method_name + "\n")
1521         else:
1522             if not takes_self:
1523                 out_java_struct += (
1524                         "\tpublic static constructor_" + meth_n + "(")
1525             else:
1526                 out_java_struct += ("\tpublic " + meth_n + "(")
1527             for idx, arg in enumerate(argument_types):
1528                 if idx != 0:
1529                     if not takes_self or idx > 1:
1530                         out_java_struct += (", ")
1531                 elif takes_self:
1532                     continue
1533                 if arg.java_ty != "void":
1534                     if arg.arg_name in default_constructor_args:
1535                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1536                             if explode_idx != 0:
1537                                 out_java_struct += (", ")
1538                             out_java_struct += arg.arg_name + "_" + explode_arg.arg_name + ": " + explode_arg.java_hu_ty
1539                     else:
1540                         out_java_struct += arg.arg_name + ": " + arg.java_hu_ty
1541                         if arg.nullable:
1542                             out_java_struct += "|null"
1543
1544         out_c += (") {\n")
1545         if out_java_struct is not None:
1546             out_java_struct += "): " + return_type_info.java_hu_ty + " {\n"
1547         for info in argument_types:
1548             if info.arg_conv is not None:
1549                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1550         if return_type_info.ret_conv is not None:
1551             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1552         elif return_type_info.c_ty != "void":
1553             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1554         else:
1555             out_c += ("\t")
1556         if c_call_string is None:
1557             out_c += (method_name + "(")
1558         else:
1559             out_c += (c_call_string)
1560         for idx, info in enumerate(argument_types):
1561             if info.arg_conv_name is not None:
1562                 if idx != 0:
1563                     out_c += (", ")
1564                 elif c_call_string is not None:
1565                     continue
1566                 out_c += (info.arg_conv_name)
1567         out_c += (")")
1568         if return_type_info.ret_conv is not None:
1569             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1570         else:
1571             out_c += (";")
1572         for info in argument_types:
1573             if info.arg_conv_cleanup is not None:
1574                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1575         if return_type_info.ret_conv is not None:
1576             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1577         elif return_type_info.c_ty != "void":
1578             out_c += ("\n\treturn ret_val;")
1579         out_c += ("\n}\n\n")
1580
1581         if args_known:
1582             out_java_struct += ("\t\t")
1583             if return_type_info.java_ty != "void":
1584                 out_java_struct += "const ret: " + return_type_info.java_ty + " = "
1585             out_java_struct += ("bindings." + method_name + "(")
1586             for idx, info in enumerate(argument_types):
1587                 if idx != 0:
1588                     out_java_struct += (", ")
1589                 if idx == 0 and takes_self:
1590                     out_java_struct += ("this.ptr")
1591                 elif info.arg_name in default_constructor_args:
1592                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1593                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1594                         if explode_idx != 0:
1595                             out_java_struct += (", ")
1596                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1597                         if explode_arg.from_hu_conv is not None:
1598                             out_java_struct += (
1599                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1600                         else:
1601                             out_java_struct += (expl_arg_name)
1602                     out_java_struct += (")")
1603                 elif info.from_hu_conv is not None:
1604                     out_java_struct += (info.from_hu_conv[0])
1605                 else:
1606                     out_java_struct += (info.arg_name)
1607             out_java_struct += (");\n")
1608             if return_type_info.to_hu_conv is not None:
1609                 if not takes_self:
1610                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1611                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1612                 else:
1613                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1614
1615             for idx, info in enumerate(argument_types):
1616                 if idx == 0 and takes_self:
1617                     pass
1618                 elif info.arg_name in default_constructor_args:
1619                     for explode_arg in default_constructor_args[info.arg_name]:
1620                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1621                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1622                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1623                                                                                              expl_arg_name).replace(
1624                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1625                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1626                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1627                         out_java_struct += (
1628                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1629                     else:
1630                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1631
1632             if return_type_info.to_hu_conv_name is not None:
1633                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1634             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1635                 out_java_struct += ("\t\treturn ret;\n")
1636             out_java_struct += ("\t}\n\n")
1637
1638         return (out_java, out_c, out_java_struct)
1639
1640     def cleanup(self):
1641         for struct in self.struct_file_suffixes:
1642             with open(self.outdir + "/structs/" + struct + self.file_ext, "a") as src:
1643                 src.write(self.struct_file_suffixes[struct])
1644
1645         with open(self.outdir + "/bindings.mts", "a") as bindings:
1646             bindings.write("""
1647
1648 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) {
1649         const weak: WeakRef<object>|undefined = js_objs[obj_ptr];
1650         if (weak == null || weak == undefined) {
1651                 console.error("Got function call on unknown/free'd JS object!");
1652                 throw new Error("Got function call on unknown/free'd JS object!");
1653         }
1654         const obj = weak.deref();
1655         if (obj == null || obj == undefined) {
1656                 console.error("Got function call on GC'd JS object!");
1657                 throw new Error("Got function call on GC'd JS object!");
1658         }
1659         var fn;
1660 """)
1661             bindings.write("\tswitch (fn_id) {\n")
1662             for f in self.function_ptrs:
1663                 bindings.write(f"\t\tcase {str(f)}: fn = Object.getOwnPropertyDescriptor(obj, \"{self.function_ptrs[f][1]}\"); break;\n")
1664
1665             bindings.write("""\t\tdefault:
1666                         console.error("Got unknown function call with id " + fn_id + " from C!");
1667                         throw new Error("Got unknown function call with id " + fn_id + " from C!");
1668         }
1669         if (fn == null || fn == undefined) {
1670                 console.error("Got function call with id " + fn_id + " on incorrect JS object: " + obj);
1671                 throw new Error("Got function call with id " + fn_id + " on incorrect JS object: " + obj);
1672         }
1673         var ret;
1674         try {
1675                 ret = fn.value.bind(obj)(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10);
1676         } catch (e) {
1677                 console.error("Got an exception calling function with id " + fn_id + "! This is fatal.");
1678                 console.error(e);
1679                 throw e;
1680         }
1681         if (ret === undefined || ret === null) return BigInt(0);
1682         return BigInt(ret);
1683 }""")