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