git.bitcoin.ninja Git - ldk-java/blob - python_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     PYTHON = 1,
  11
  12 class Consts:
  13     def __init__(self, DEBUG: bool, target: Target, outdir: str, **kwargs):
  14         self.outdir = outdir
  15         self.struct_file_suffixes = {}
  16         self.function_ptr_counter = 0
  17         self.function_ptrs = {}
  18         self.c_type_map = dict(
  19             bool = ['bool', 'bool', 'XXX'],
  20             uint8_t = ['int', 'int', 'Uint8Array'],
  21             uint16_t = ['int', 'int', 'Uint16Array'],
  22             uint32_t = ['int', 'int', 'Uint32Array'],
  23             uint64_t = ['int', 'int', 'BigUint64Array'],
  24         )
  25         self.java_type_map = dict(
  26             String = "number"
  27         )
  28         self.java_hu_type_map = dict(
  29             String = "string"
  30         )
  31
  32         self.to_hu_conv_templates = dict(
  33             ptr = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  34             default = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  35         )
  36
  37         self.bindings_header = """
  38 import * as version from './version.mjs';
  39 import { UInt5, WitnessVersion } from './structs/CommonBase.mjs';
  40
  41 const imports: any = {};
  42 imports.env = {};
  43
  44 var js_objs: Array<WeakRef<object>> = [];
  45 var js_invoke: Function;
  46 var getRandomValues: Function;
  47
  48 imports.wasi_snapshot_preview1 = {
  49         "fd_write": (fd: number, iovec_array_ptr: number, iovec_array_len: number, bytes_written_ptr: number) => {
  50                 // This should generally only be used to print panic messages
  51                 const ptr_len_view = new Uint32Array(wasm.memory.buffer, iovec_array_ptr, iovec_array_len * 2);
  52                 var bytes_written = 0;
  53                 for (var i = 0; i < iovec_array_len; i++) {
  54                         const bytes_view = new Uint8Array(wasm.memory.buffer, ptr_len_view[i*2], ptr_len_view[i*2+1]);
  55                         console.log("[fd " + fd + "]: " + String.fromCharCode(...bytes_view));
  56                         bytes_written += ptr_len_view[i*2+1]!;
  57                 }
  58                 const written_view = new Uint32Array(wasm.memory.buffer, bytes_written_ptr, 1);
  59                 written_view[0] = bytes_written;
  60                 return 0;
  61         },
  62         "fd_close": (_fd: number) => {
  63                 // This is not generally called, but may be referenced in debug builds
  64                 console.log("wasi_snapshot_preview1:fd_close");
  65                 return 58; // Not Supported
  66         },
  67         "fd_seek": (_fd: number, _offset: bigint, _whence: number, _new_offset: number) => {
  68                 // This is not generally called, but may be referenced in debug builds
  69                 console.log("wasi_snapshot_preview1:fd_seek");
  70                 return 58; // Not Supported
  71         },
  72         "random_get": (buf_ptr: number, buf_len: number) => {
  73                 const buf = new Uint8Array(wasm.memory.buffer, buf_ptr, buf_len);
  74                 getRandomValues(buf);
  75                 return 0;
  76         },
  77         "environ_sizes_get": (environ_var_count_ptr: number, environ_len_ptr: number) => {
  78                 // This is called before fd_write to format + print panic messages
  79                 const out_count_view = new Uint32Array(wasm.memory.buffer, environ_var_count_ptr, 1);
  80                 out_count_view[0] = 0;
  81                 const out_len_view = new Uint32Array(wasm.memory.buffer, environ_len_ptr, 1);
  82                 out_len_view[0] = 0;
  83                 return 0;
  84         },
  85         "environ_get": (_environ_ptr: number, _environ_buf_ptr: number) => {
  86                 // This is called before fd_write to format + print panic messages,
  87                 // but only if we have variables in environ_sizes_get, so shouldn't ever actually happen!
  88                 console.log("wasi_snapshot_preview1:environ_get");
  89                 return 58; // Note supported - we said there were 0 environment entries!
  90         },
  91         "proc_exit" : () => {
  92                 console.log("wasi_snapshot_preview1:proc_exit");
  93         },
  94 };
  95
  96 var wasm: any = null;
  97 let isWasmInitialized: boolean = false;
  98
  99 async function finishInitializeWasm(wasmInstance: WebAssembly.Instance) {
 100         if (typeof crypto === "undefined") {
 101                 var crypto_import = (await import('crypto')).webcrypto;
 102                 getRandomValues = crypto_import.getRandomValues.bind(crypto_import);
 103         } else {
 104                 getRandomValues = crypto.getRandomValues.bind(crypto);
 105         }
 106
 107         wasm = wasmInstance.exports;
 108         if (!wasm.test_bigint_pass_deadbeef0badf00d(BigInt("0xdeadbeef0badf00d"))) {
 109                 throw new Error(\"Currently need BigInt-as-u64 support, try ----experimental-wasm-bigint");
 110         }
 111
 112         if (decodeString(wasm.TS_get_lib_version_string()) !== version.get_ldk_java_bindings_version())
 113                 throw new Error(\"Compiled LDK library and LDK class files do not match\");
 114         // Fetching the LDK versions from C also checks that the header and binaries match
 115         const c_bindings_ver: number = wasm.TS_get_ldk_c_bindings_version();
 116         const ldk_ver: number = wasm.TS_get_ldk_version();
 117         if (c_bindings_ver == 0)
 118                 throw new Error(\"LDK version did not match the header we built against\");
 119         if (ldk_ver == 0)
 120                 throw new Error(\"LDK C bindings version did not match the header we built against\");
 121         const c_bindings_version: string = decodeString(c_bindings_ver)
 122         const ldk_version: string = decodeString(ldk_ver);
 123         console.log(\"Loaded LDK-Java Bindings with LDK \" + ldk_version + \" and LDK-C-Bindings \" + c_bindings_version);
 124
 125         isWasmInitialized = true;
 126 }
 127
 128 const fn_list = ["uuuuuu", "buuuuu", "bbuuuu", "bbbuuu", "bbbbuu",
 129         "bbbbbb", "ubuubu", "ubuuuu", "ubbuuu", "uubuuu", "uububu", "ububuu"];
 130
 131 /* @internal */
 132 export async function initializeWasmFromUint8Array(wasmBinary: Uint8Array) {
 133         for (const fn of fn_list) { imports.env["js_invoke_function_" + fn] = js_invoke; }
 134         const { instance: wasmInstance } = await WebAssembly.instantiate(wasmBinary, imports);
 135         await finishInitializeWasm(wasmInstance);
 136 }
 137
 138 /* @internal */
 139 export async function initializeWasmFetch(uri: string) {
 140         for (const fn of fn_list) { imports.env["js_invoke_function_" + fn] = js_invoke; }
 141         const stream = fetch(uri);
 142         const { instance: wasmInstance } = await WebAssembly.instantiateStreaming(stream, imports);
 143         await finishInitializeWasm(wasmInstance);
 144 }"""
 145
 146         self.bindings_header += """
 147 // WASM CODEC
 148
 149 /* @internal */
 150 export function uint5ArrToBytes(inputArray: Array<UInt5>): Uint8Array {
 151         const arr = new Uint8Array(inputArray.length);
 152         for (var i = 0; i < inputArray.length; i++) {
 153                 arr[i] = inputArray[i]!.getVal();
 154         }
 155         return arr;
 156 }
 157
 158 /* @internal */
 159 export function WitnessVersionArrToBytes(inputArray: Array<WitnessVersion>): Uint8Array {
 160         const arr = new Uint8Array(inputArray.length);
 161         for (var i = 0; i < inputArray.length; i++) {
 162                 arr[i] = inputArray[i]!.getVal();
 163         }
 164         return arr;
 165 }
 166
 167
 168
 169 /* @internal */
 170 export function encodeUint128 (inputVal: bigint): number {
 171         if (inputVal >= 0x10000000000000000000000000000000n) throw "U128s cannot exceed 128 bits";
 172         const cArrayPointer = wasm.TS_malloc(16 + 8);
 173         const arrayLengthView = new BigUint64Array(wasm.memory.buffer, cArrayPointer, 1);
 174         arrayLengthView[0] = BigInt(16);
 175         const arrayMemoryView = new Uint8Array(wasm.memory.buffer, cArrayPointer + 8, 16);
 176         for (var i = 0; i < 16; i++) arrayMemoryView[i] = Number((inputVal >> BigInt(i)*8n) & 0xffn);
 177         return cArrayPointer;
 178 }
 179 /* @internal */
 180 export function encodeUint8Array (inputArray: Uint8Array|null): number {
 181         if (inputArray == null) return 0;
 182         const cArrayPointer = wasm.TS_malloc(inputArray.length + 8);
 183         const arrayLengthView = new BigUint64Array(wasm.memory.buffer, cArrayPointer, 1);
 184         arrayLengthView[0] = BigInt(inputArray.length);
 185         const arrayMemoryView = new Uint8Array(wasm.memory.buffer, cArrayPointer + 8, inputArray.length);
 186         arrayMemoryView.set(inputArray);
 187         return cArrayPointer;
 188 }
 189 /* @internal */
 190 export function encodeUint32Array (inputArray: Uint32Array|Array<number>|null): number {
 191         if (inputArray == null) return 0;
 192         const cArrayPointer = wasm.TS_malloc((inputArray.length + 2) * 4);
 193         const arrayLengthView = new BigUint64Array(wasm.memory.buffer, cArrayPointer, 1);
 194         arrayLengthView[0] = BigInt(inputArray.length);
 195         const arrayMemoryView = new Uint32Array(wasm.memory.buffer, cArrayPointer + 8, inputArray.length);
 196         arrayMemoryView.set(inputArray);
 197         return cArrayPointer;
 198 }
 199 /* @internal */
 200 export function encodeUint64Array (inputArray: BigUint64Array|Array<bigint>|null): number {
 201         if (inputArray == null) return 0;
 202         const cArrayPointer = wasm.TS_malloc((inputArray.length + 1) * 8);
 203         const arrayMemoryView = new BigUint64Array(wasm.memory.buffer, cArrayPointer, inputArray.length + 1);
 204         arrayMemoryView[0] = BigInt(inputArray.length);
 205         arrayMemoryView.set(inputArray, 1);
 206         return cArrayPointer;
 207 }
 208
 209 /* @internal */
 210 export function check_arr_len(arr: Uint8Array|null, len: number): Uint8Array|null {
 211         if (arr !== null && arr.length != len) { throw new Error("Expected array of length " + len + " got " + arr.length); }
 212         return arr;
 213 }
 214
 215 /* @internal */
 216 export function getArrayLength(arrayPointer: number): number {
 217         const arraySizeViewer = new BigUint64Array(wasm.memory.buffer, arrayPointer, 1);
 218         const len = arraySizeViewer[0]!;
 219         if (len >= (2n ** 32n)) throw new Error("Bogus Array Size");
 220         return Number(len % (2n ** 32n));
 221 }
 222 /* @internal */
 223 export function decodeUint128 (arrayPointer: number, free = true): bigint {
 224         const arraySize = getArrayLength(arrayPointer);
 225         if (arraySize != 16) throw "Need 16 bytes for a uint128";
 226         const actualArrayViewer = new Uint8Array(wasm.memory.buffer, arrayPointer + 8, arraySize);
 227         var val = 0n;
 228         for (var i = 0; i < 16; i++) {
 229                 val <<= 8n;
 230                 val |= BigInt(actualArrayViewer[i]!);
 231         }
 232         if (free) {
 233                 wasm.TS_free(arrayPointer);
 234         }
 235         return val;
 236 }
 237 /* @internal */
 238 export function decodeUint8Array (arrayPointer: number, free = true): Uint8Array {
 239         const arraySize = getArrayLength(arrayPointer);
 240         const actualArrayViewer = new Uint8Array(wasm.memory.buffer, arrayPointer + 8, arraySize);
 241         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 242         // will free the underlying memory when it becomes unreachable instead of copying here.
 243         // Note that doing so may have edge-case interactions with memory resizing (invalidating the buffer).
 244         const actualArray = actualArrayViewer.slice(0, arraySize);
 245         if (free) {
 246                 wasm.TS_free(arrayPointer);
 247         }
 248         return actualArray;
 249 }
 250 const decodeUint32Array = (arrayPointer: number, free = true) => {
 251         const arraySize = getArrayLength(arrayPointer);
 252         const actualArrayViewer = new Uint32Array(
 253                 wasm.memory.buffer, // value
 254                 arrayPointer + 8, // offset (ignoring length bytes)
 255                 arraySize // uint32 count
 256         );
 257         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 258         // will free the underlying memory when it becomes unreachable instead of copying here.
 259         const actualArray = actualArrayViewer.slice(0, arraySize);
 260         if (free) {
 261                 wasm.TS_free(arrayPointer);
 262         }
 263         return actualArray;
 264 }
 265 /* @internal */
 266 export function decodeUint64Array (arrayPointer: number, free = true): bigint[] {
 267         const arraySize = getArrayLength(arrayPointer);
 268         const actualArrayViewer = new BigUint64Array(
 269                 wasm.memory.buffer, // value
 270                 arrayPointer + 8, // offset (ignoring length bytes)
 271                 arraySize // uint32 count
 272         );
 273         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 274         // will free the underlying memory when it becomes unreachable instead of copying here.
 275         const actualArray = new Array(arraySize);
 276         for (var i = 0; i < arraySize; i++) actualArray[i] = actualArrayViewer[i];
 277         if (free) {
 278                 wasm.TS_free(arrayPointer);
 279         }
 280         return actualArray;
 281 }
 282
 283 export function freeWasmMemory(pointer: number) { wasm.TS_free(pointer); }
 284
 285 /* @internal */
 286 export function getU64ArrayElem(arrayPointer: number, idx: number): bigint {
 287         const actualArrayViewer = new BigUint64Array(wasm.memory.buffer, arrayPointer + 8, idx + 1);
 288         return actualArrayViewer[idx]!;
 289 }
 290
 291 /* @internal */
 292 export function getU32ArrayElem(arrayPointer: number, idx: number): number {
 293         const actualArrayViewer = new Uint32Array(wasm.memory.buffer, arrayPointer + 8, idx + 1);
 294         return actualArrayViewer[idx]!;
 295 }
 296
 297 /* @internal */
 298 export function getU8ArrayElem(arrayPointer: number, idx: number): number {
 299         const actualArrayViewer = new Uint8Array(wasm.memory.buffer, arrayPointer + 8, idx + 1);
 300         return actualArrayViewer[idx]!;
 301 }
 302
 303
 304 /* @internal */
 305 export function encodeString(str: string): number {
 306         const charArray = new TextEncoder().encode(str);
 307         return encodeUint8Array(charArray);
 308 }
 309
 310 /* @internal */
 311 export function decodeString(stringPointer: number, free = true): string {
 312         const arraySize = getArrayLength(stringPointer);
 313         const memoryView = new Uint8Array(wasm.memory.buffer, stringPointer + 8, arraySize);
 314         const result = new TextDecoder("utf-8").decode(memoryView);
 315
 316         if (free) {
 317                 wasm.TS_free(stringPointer);
 318         }
 319
 320         return result;
 321 }
 322 """
 323         if DEBUG:
 324             self.bindings_header += """
 325 /* @internal */
 326 export function getRemainingAllocationCount(): number {
 327         return wasm.TS_allocs_remaining();
 328 }
 329 /* @internal */
 330 export function debugPrintRemainingAllocs() {
 331         wasm.TS_print_leaks();
 332 }
 333 """
 334         else:
 335             self.bindings_header += "\n/* @internal */ export function getRemainingAllocationCount(): number { return 0; }\n"
 336             self.bindings_header += "/* @internal */ export function debugPrintRemainingAllocs() { }\n"
 337
 338         with open(outdir + "/index.py", 'a') as index:
 339             index.write("""import { initializeWasmFetch, initializeWasmFromUint8Array } from './bindings.mjs';
 340 /** Initializes the WASM backend by calling `fetch()` on the given URI - Browser only */
 341 export async function initializeWasmWebFetch(uri: string) {
 342         await initializeWasmFetch(uri);
 343 }
 344 /** Initializes the WASM backend given a Uint8Array of the .wasm binary file - Browser or Node.JS */
 345 export async function initializeWasmFromBinary(bin: Uint8Array) {
 346         await initializeWasmFromUint8Array(bin);
 347 }
 348
 349 """)
 350
 351         self.bindings_version_file = """export function get_ldk_java_bindings_version(): String {
 352         return "<git_version_ldk_garbagecollected>";
 353 }"""
 354
 355         self.common_base = """
 356 function freer(f: () => void) { f() }
 357 const finalizer = new FinalizationRegistry(freer);
 358 function get_freeer(ptr: bigint, free_fn: (ptr: bigint) => void) {
 359         return () => {
 360                 free_fn(ptr);
 361         }
 362 }
 363
 364 export class UInt5 {
 365         public constructor(private val: number) {
 366                 if (val > 32 || val < 0) throw new Error("UInt5 value is out of range");
 367         }
 368         public getVal(): number {
 369                 return this.val;
 370         }
 371 }
 372
 373 export class WitnessVersion {
 374         public constructor(private val: number) {
 375                 if (val > 16 || val < 0) throw new Error("WitnessVersion value is out of range");
 376         }
 377         public getVal(): number {
 378                 return this.val;
 379         }
 380 }
 381
 382 export class UnqualifiedError {
 383         public constructor(_val: number) {}
 384 }
 385 """
 386
 387         self.txout_defn = """export class TxOut extends CommonBase {
 388         /** The script_pubkey in this output */
 389         public script_pubkey: Uint8Array;
 390         /** The value, in satoshis, of this output */
 391         public value: bigint;
 392
 393         /* @internal */
 394         public constructor(_dummy: null, ptr: bigint) {
 395                 super(ptr, bindings.TxOut_free);
 396                 this.script_pubkey = bindings.decodeUint8Array(bindings.TxOut_get_script_pubkey(ptr));
 397                 this.value = bindings.TxOut_get_value(ptr);
 398         }
 399         public static constructor_new(value: bigint, script_pubkey: Uint8Array): TxOut {
 400                 return new TxOut(null, bindings.TxOut_new(bindings.encodeUint8Array(script_pubkey), value));
 401         }
 402 }"""
 403         self.obj_defined(["TxOut"], "structs")
 404
 405         self.scalar_defn = """export class BigEndianScalar extends CommonBase {
 406         /** The bytes of the scalar value, in big endian */
 407         public scalar_bytes: Uint8Array;
 408
 409         /* @internal */
 410         public constructor(_dummy: null, ptr: bigint) {
 411                 super(ptr, bindings.BigEndianScalar_free);
 412                 this.scalar_bytes = bindings.decodeUint8Array(bindings.BigEndianScalar_get_bytes(ptr));
 413         }
 414         public static constructor_new(scalar_bytes: Uint8Array): BigEndianScalar {
 415                 return new BigEndianScalar(null, bindings.BigEndianScalar_new(bindings.encodeUint8Array(scalar_bytes)));
 416         }
 417 }"""
 418         self.obj_defined(["BigEndianScalar"], "structs")
 419
 420         self.c_file_pfx = """#include "js-wasm.h"
 421 #include <stdatomic.h>
 422 #include <lightning.h>
 423
 424 // These should be provided...somehow...
 425 void *memset(void *s, int c, size_t n);
 426 void *memcpy(void *dest, const void *src, size_t n);
 427 int memcmp(const void *s1, const void *s2, size_t n);
 428
 429 extern void __attribute__((noreturn)) abort(void);
 430 static inline void assert(bool expression) {
 431         if (!expression) { abort(); }
 432 }
 433
 434 uint32_t __attribute__((export_name("test_bigint_pass_deadbeef0badf00d"))) test_bigint_pass_deadbeef0badf00d(uint64_t val) {
 435         return val == 0xdeadbeef0badf00dULL;
 436 }
 437
 438 """
 439
 440         if not DEBUG:
 441             self.c_file_pfx += """
 442 void *malloc(size_t size);
 443 void free(void *ptr);
 444
 445 #define MALLOC(a, _) malloc(a)
 446 #define do_MALLOC(a, _b, _c) malloc(a)
 447 #define FREE(p) if ((unsigned long)(p) > 4096) { free(p); }
 448 #define DO_ASSERT(a) (void)(a)
 449 #define CHECK(a)
 450 #define CHECK_ACCESS(p)
 451 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v)
 452 """
 453         else:
 454             self.c_file_pfx += """
 455 extern int snprintf(char *str, size_t size, const char *format, ...);
 456 typedef int32_t ssize_t;
 457 ssize_t write(int fd, const void *buf, size_t count);
 458 #define DEBUG_PRINT(...) do { \\
 459         char debug_str[1024]; \\
 460         int s_len = snprintf(debug_str, 1023, __VA_ARGS__); \\
 461         write(2, debug_str, s_len); \\
 462 } while (0);
 463
 464 // Always run a, then assert it is true:
 465 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 466 // Assert a is true or do nothing
 467 #define CHECK(a) DO_ASSERT(a)
 468
 469 // Running a leak check across all the allocations and frees of the JDK is a mess,
 470 // so instead we implement our own naive leak checker here, relying on the -wrap
 471 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 472 // and free'd in Rust or C across the generated bindings shared library.
 473
 474 #define BT_MAX 128
 475 typedef struct allocation {
 476         struct allocation* next;
 477         void* ptr;
 478         const char* struct_name;
 479         int lineno;
 480 } allocation;
 481 static allocation* allocation_ll = NULL;
 482 static allocation* freed_ll = NULL;
 483
 484 extern void* __real_malloc(size_t len);
 485 extern void* __real_calloc(size_t nmemb, size_t len);
 486 extern void* __real_aligned_alloc(size_t alignment, size_t size);
 487 static void new_allocation(void* res, const char* struct_name, int lineno) {
 488         allocation* new_alloc = __real_malloc(sizeof(allocation));
 489         new_alloc->ptr = res;
 490         new_alloc->struct_name = struct_name;
 491         new_alloc->next = allocation_ll;
 492         new_alloc->lineno = lineno;
 493         allocation_ll = new_alloc;
 494 }
 495 static void* do_MALLOC(size_t len, const char* struct_name, int lineno) {
 496         void* res = __real_malloc(len);
 497         new_allocation(res, struct_name, lineno);
 498         return res;
 499 }
 500 #define MALLOC(len, struct_name) do_MALLOC(len, struct_name, __LINE__)
 501
 502 void __real_free(void* ptr);
 503 static void alloc_freed(void* ptr, int lineno) {
 504         allocation* p = NULL;
 505         allocation* it = allocation_ll;
 506         while (it->ptr != ptr) {
 507                 p = it; it = it->next;
 508                 if (it == NULL) {
 509                         p = NULL;
 510                         it = freed_ll;
 511                         while (it && it->ptr != ptr) { p = it; it = it->next; }
 512                         if (it == NULL) {
 513                                 DEBUG_PRINT("Tried to free unknown pointer %p at line %d.\\n", ptr, lineno);
 514                         } else {
 515                                 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);
 516                         }
 517                         abort();
 518                 }
 519         }
 520         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 521         DO_ASSERT(it->ptr == ptr);
 522         it->next = freed_ll;
 523         freed_ll = it;
 524 }
 525 static void do_FREE(void* ptr, int lineno) {
 526         if ((unsigned long)ptr <= 4096) return; // Rust loves to create pointers to the NULL page for dummys
 527         alloc_freed(ptr, lineno);
 528         __real_free(ptr);
 529 }
 530 #define FREE(ptr) do_FREE(ptr, __LINE__)
 531
 532 static void CHECK_ACCESS(const void* ptr) {
 533         allocation* it = allocation_ll;
 534         while (it->ptr != ptr) {
 535                 it = it->next;
 536                 if (it == NULL) {
 537                         return; // addrsan should catch malloc-unknown and print more info than we have
 538                 }
 539         }
 540 }
 541 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v) \\
 542         if (v.is_owned && v.inner != NULL) { \\
 543                 const void *p = __unmangle_inner_ptr(v.inner); \\
 544                 if (p != NULL) { \\
 545                         CHECK_ACCESS(p); \\
 546                 } \\
 547         }
 548
 549 void* __wrap_malloc(size_t len) {
 550         void* res = __real_malloc(len);
 551         new_allocation(res, "malloc call", 0);
 552         return res;
 553 }
 554 void* __wrap_calloc(size_t nmemb, size_t len) {
 555         void* res = __real_calloc(nmemb, len);
 556         new_allocation(res, "calloc call", 0);
 557         return res;
 558 }
 559 void* __wrap_aligned_alloc(size_t alignment, size_t size) {
 560         void* res = __real_aligned_alloc(alignment, size);
 561         new_allocation(res, "aligned_alloc call", 0);
 562         return res;
 563 }
 564 void __wrap_free(void* ptr) {
 565         if (ptr == NULL) return;
 566         alloc_freed(ptr, 0);
 567         __real_free(ptr);
 568 }
 569
 570 void* __real_realloc(void* ptr, size_t newlen);
 571 void* __wrap_realloc(void* ptr, size_t len) {
 572         if (ptr != NULL) alloc_freed(ptr, 0);
 573         void* res = __real_realloc(ptr, len);
 574         new_allocation(res, "realloc call", 0);
 575         return res;
 576 }
 577 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 578         // Rust doesn't seem to use reallocarray currently
 579         DO_ASSERT(false);
 580 }
 581
 582 uint32_t __attribute__((export_name("TS_allocs_remaining"))) allocs_remaining() {
 583         uint32_t count = 0;
 584         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 585                 count++;
 586         }
 587         return count;
 588 }
 589 void __attribute__((export_name("TS_print_leaks"))) print_leaks() {
 590         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 591                 DEBUG_PRINT("%s %p remains. Allocated on line %d\\n", a->struct_name, a->ptr, a->lineno);
 592         }
 593 }
 594 """
 595         self.c_file_pfx = self.c_file_pfx + """
 596 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 597 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 598 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 599 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 600
 601 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 602
 603 #define DECL_ARR_TYPE(ty, name) \\
 604         struct name##array { \\
 605                 uint64_t arr_len; /* uint32_t would suffice but we want to align uint64_ts as well */ \\
 606                 ty elems[]; \\
 607         }; \\
 608         typedef struct name##array * name##Array; \\
 609         static inline name##Array init_##name##Array(size_t arr_len, int lineno) { \\
 610                 name##Array arr = (name##Array)do_MALLOC(arr_len * sizeof(ty) + sizeof(uint64_t), #name" array init", lineno); \\
 611                 arr->arr_len = arr_len; \\
 612                 return arr; \\
 613         }
 614
 615 DECL_ARR_TYPE(int64_t, int64_t);
 616 DECL_ARR_TYPE(uint64_t, uint64_t);
 617 DECL_ARR_TYPE(int8_t, int8_t);
 618 DECL_ARR_TYPE(uint32_t, uint32_t);
 619 DECL_ARR_TYPE(void*, ptr);
 620 DECL_ARR_TYPE(char, char);
 621 typedef charArray jstring;
 622
 623 static inline jstring str_ref_to_ts(const char* chars, size_t len) {
 624         charArray arr = init_charArray(len, __LINE__);
 625         memcpy(arr->elems, chars, len);
 626         return arr;
 627 }
 628 static inline LDKStr str_ref_to_owned_c(const jstring str) {
 629         char* newchars = MALLOC(str->arr_len + 1, "String chars");
 630         memcpy(newchars, str->elems, str->arr_len);
 631         newchars[str->arr_len] = 0;
 632         LDKStr res = {
 633                 .chars = newchars,
 634                 .len = str->arr_len,
 635                 .chars_is_owned = true
 636         };
 637         return res;
 638 }
 639
 640 typedef bool jboolean;
 641
 642 uint32_t __attribute__((export_name("TS_malloc"))) TS_malloc(uint32_t size) {
 643         return (uint32_t)MALLOC(size, "JS-Called malloc");
 644 }
 645 void __attribute__((export_name("TS_free"))) TS_free(uint32_t ptr) {
 646         FREE((void*)ptr);
 647 }
 648
 649 jstring __attribute__((export_name("TS_get_ldk_c_bindings_version"))) TS_get_ldk_c_bindings_version() {
 650         const char *res = check_get_ldk_bindings_version();
 651         if (res == NULL) return NULL;
 652         return str_ref_to_ts(res, strlen(res));
 653 }
 654 jstring __attribute__((export_name("TS_get_ldk_version"))) get_ldk_version() {
 655         const char *res = check_get_ldk_version();
 656         if (res == NULL) return NULL;
 657         return str_ref_to_ts(res, strlen(res));
 658 }
 659 #include "version.c"
 660 """
 661
 662         self.c_version_file = """jstring __attribute__((export_name("TS_get_lib_version_string"))) TS_get_lib_version_string() {
 663         return str_ref_to_ts("<git_version_ldk_garbagecollected>", strlen("<git_version_ldk_garbagecollected>"));
 664 }"""
 665
 666         self.hu_struct_file_prefix = """
 667 import { CommonBase, UInt5, WitnessVersion, UnqualifiedError } from './CommonBase.mjs';
 668 import * as bindings from '../bindings.mjs'
 669
 670 """
 671         self.hu_struct_file_suffix = ""
 672         self.util_fn_pfx = self.hu_struct_file_prefix + "\nexport class UtilMethods extends CommonBase {\n"
 673         self.util_fn_sfx = "}"
 674         self.c_fn_ty_pfx = ""
 675         self.file_ext = ".py"
 676         self.ptr_c_ty = "uint64_t"
 677         self.ptr_native_ty = "bigint"
 678         self.u128_native_ty = "bigint"
 679         self.usize_c_ty = "uint32_t"
 680         self.usize_native_ty = "number"
 681         self.native_zero_ptr = "0n"
 682         self.unitary_enum_c_ty = "uint32_t"
 683         self.ptr_arr = "ptrArray"
 684         self.is_arr_some_check = ("", " != 0")
 685         self.get_native_arr_len_call = ("", "->arr_len")
 686
 687     def bindings_footer(self):
 688         return ""
 689
 690     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 691         return None
 692     def create_native_arr_call(self, arr_len, ty_info):
 693         if ty_info.c_ty == "ptrArray":
 694             assert ty_info.rust_obj == "LDKCVec_U5Z" or (ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"))
 695         return "init_" + ty_info.c_ty + "(" + arr_len + ", __LINE__)"
 696     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 697         if ty_info.c_ty == "int8_tArray":
 698             return ("memcpy(" + arr_name + "->elems, ", ", " + arr_len + ")")
 699         else:
 700             assert False
 701     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 702         if ty_info.c_ty == "int8_tArray":
 703             if copy:
 704                 return "memcpy(" + dest_name + ", " + arr_name + "->elems, " + arr_len + "); FREE(" + arr_name + ")"
 705         assert not copy
 706         if ty_info.c_ty == "ptrArray":
 707             return "(void*) " + arr_name + "->elems"
 708         else:
 709             return arr_name + "->elems"
 710     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 711         assert False # Only called if above is None
 712     def get_native_arr_ptr_call(self, ty_info):
 713         if ty_info.subty is not None:
 714             return "(" + ty_info.subty.c_ty + "*)(((uint8_t*)", ") + 8)"
 715         return "(" + ty_info.c_ty + "*)(((uint8_t*)", ") + 8)"
 716     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 717         return None
 718     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 719         if ty_info.c_ty == "int8_tArray":
 720             return "FREE(" + arr_name + ");"
 721         else:
 722             return "FREE(" + arr_name + ")"
 723
 724     def map_hu_array_elems(self, arr_name, conv_name, arr_ty, elem_ty):
 725         if elem_ty.rust_obj == "LDKU5":
 726             return arr_name + " != null ? bindings.uint5ArrToBytes(" + arr_name + ") : null"
 727         assert elem_ty.c_ty == "uint64_t" or elem_ty.c_ty.endswith("Array")
 728         return arr_name + " != null ? " + arr_name + ".map(" + conv_name + " => " + elem_ty.from_hu_conv[0] + ") : null"
 729
 730     def str_ref_to_native_call(self, var_name, str_len):
 731         return "str_ref_to_ts(" + var_name + ", " + str_len + ")"
 732     def str_ref_to_c_call(self, var_name):
 733         return "str_ref_to_owned_c(" + var_name + ")"
 734     def str_to_hu_conv(self, var_name):
 735         return "const " + var_name + "_conv: string = bindings.decodeString(" + var_name + ");"
 736     def str_from_hu_conv(self, var_name):
 737         return ("bindings.encodeString(" + var_name + ")", "")
 738
 739     def c_fn_name_define_pfx(self, fn_name, have_args):
 740         return " __attribute__((export_name(\"TS_" + fn_name + "\"))) TS_" + fn_name + "("
 741
 742     def init_str(self):
 743         return ""
 744
 745     def get_java_arr_len(self, arr_name):
 746         return "bindings.getArrayLength(" + arr_name + ")"
 747     def get_java_arr_elem(self, elem_ty, arr_name, idx):
 748         if elem_ty.c_ty.endswith("Array") or elem_ty.c_ty == "uintptr_t":
 749             return "bindings.getU32ArrayElem(" + arr_name + ", " + idx + ")"
 750         elif elem_ty.c_ty == "uint64_t":
 751             return "bindings.getU64ArrayElem(" + arr_name + ", " + idx + ")"
 752         elif elem_ty.rust_obj == "LDKU5":
 753             return "bindings.getU8ArrayElem(" + arr_name + ", " + idx + ")"
 754         else:
 755             assert False
 756     def constr_hu_array(self, ty_info, arr_len):
 757         return "new Array(" + arr_len + ").fill(null)"
 758     def cleanup_converted_native_array(self, ty_info, arr_name):
 759         return "bindings.freeWasmMemory(" + arr_name + ")"
 760
 761     def primitive_arr_from_hu(self, arr_ty, fixed_len, arr_name):
 762         mapped_ty = arr_ty.subty
 763         inner = arr_name
 764         if arr_ty.rust_obj == "LDKU128":
 765             return ("bindings.encodeUint128(" + inner + ")", "")
 766         if fixed_len is not None:
 767             assert mapped_ty.c_ty == "int8_t"
 768             inner = "bindings.check_arr_len(" + arr_name + ", " + fixed_len + ")"
 769         if mapped_ty.c_ty.endswith("Array"):
 770             return ("bindings.encodeUint32Array(" + inner + ")", "")
 771         elif mapped_ty.c_ty == "uint8_t" or mapped_ty.c_ty == "int8_t":
 772             return ("bindings.encodeUint8Array(" + inner + ")", "")
 773         elif mapped_ty.c_ty == "uint32_t":
 774             return ("bindings.encodeUint32Array(" + inner + ")", "")
 775         elif mapped_ty.c_ty == "int64_t" or mapped_ty.c_ty == "uint64_t":
 776             return ("bindings.encodeUint64Array(" + inner + ")", "")
 777         else:
 778             print(mapped_ty.c_ty)
 779             assert False
 780
 781     def primitive_arr_to_hu(self, arr_ty, fixed_len, arr_name, conv_name):
 782         mapped_ty = arr_ty.subty
 783         if arr_ty.rust_obj == "LDKU128":
 784             return "const " + conv_name + ": bigint = bindings.decodeUint128(" + arr_name + ");"
 785         elif mapped_ty.c_ty == "uint8_t" or mapped_ty.c_ty == "int8_t":
 786             return "const " + conv_name + ": Uint8Array = bindings.decodeUint8Array(" + arr_name + ");"
 787         elif mapped_ty.c_ty == "uint64_t" or mapped_ty.c_ty == "int64_t":
 788             return "const " + conv_name + ": bigint[] = bindings.decodeUint64Array(" + arr_name + ");"
 789         else:
 790             assert False
 791
 792     def var_decl_statement(self, ty_string, var_name, statement):
 793         return "const " + var_name + ": " + ty_string + " = " + statement
 794
 795     def java_arr_ty_str(self, elem_ty_str):
 796         return "number"
 797
 798     def for_n_in_range(self, n, minimum, maximum):
 799         return "for (var " + n + " = " + minimum + "; " + n + " < " + maximum + "; " + n + "++) {"
 800     def for_n_in_arr(self, n, arr_name, arr_elem_ty):
 801         return (arr_name + ".forEach((" + n + ": " + arr_elem_ty.java_hu_ty + ") => { ", " })")
 802
 803     def get_ptr(self, var):
 804         return "CommonBase.get_ptr_of(" + var + ")"
 805     def set_null_skip_free(self, var):
 806         return "CommonBase.set_null_skip_free(" + var + ");"
 807
 808     def add_ref(self, holder, referent):
 809         return "CommonBase.add_ref_from(" + holder + ", " + referent + ")"
 810
 811     def obj_defined(self, struct_names, folder):
 812         with open(self.outdir + "/index.py", 'a') as index:
 813             index.write(f"export * from './{folder}/{struct_names[0]}.mjs';\n")
 814         with open(self.outdir + "/imports.py.part", 'a') as imports:
 815             imports.write(f"import {{ {', '.join(struct_names)} }} from '../{folder}/{struct_names[0]}.mjs';\n")
 816
 817     def fully_qualified_hu_ty_path(self, ty):
 818         return ty.java_hu_ty
 819
 820     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 821         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_js(int32_t ord) {\n"
 822         out_c = out_c + "\tswitch (ord) {\n"
 823         ord_v = 0
 824
 825         out_typescript_enum_fields = ""
 826
 827         for var, var_docs in variants:
 828             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 829             ord_v = ord_v + 1
 830             if var_docs is not None:
 831                 var_docs_repld = var_docs.replace("\n", "\n\t")
 832                 out_typescript_enum_fields += f"/**\n\t * {var_docs_repld}\n\t */\n"
 833             out_typescript_enum_fields += f"\t{var},\n\t"
 834         out_c = out_c + "\t}\n"
 835         out_c = out_c + "\tabort();\n"
 836         out_c = out_c + "}\n"
 837
 838         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_js(LDK" + struct_name + " val) {\n"
 839         out_c = out_c + "\tswitch (val) {\n"
 840         ord_v = 0
 841         for var, _ in variants:
 842             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 843             ord_v = ord_v + 1
 844         out_c = out_c + "\t\tdefault: abort();\n"
 845         out_c = out_c + "\t}\n"
 846         out_c = out_c + "}\n"
 847
 848         # Note that this is *not* marked /* @internal */ as we re-expose it directly in enums/
 849         enum_comment_formatted = enum_doc_comment.replace("\n", "\n * ")
 850         out_typescript = f"""
 851 /**
 852  * {enum_comment_formatted}
 853  */
 854 export enum {struct_name} {{
 855         {out_typescript_enum_fields}
 856 }}
 857 """
 858         out_typescript_enum = f"export {{ {struct_name} }} from \"../bindings.mjs\";"
 859         self.obj_defined([struct_name], "enums")
 860         return (out_c, out_typescript_enum, out_typescript)
 861
 862     def c_unitary_enum_to_native_call(self, ty_info):
 863         return (ty_info.rust_obj + "_to_js(", ")")
 864     def native_unitary_enum_to_c_call(self, ty_info):
 865         return (ty_info.rust_obj + "_from_js(", ")")
 866
 867     def native_c_map_trait(self, struct_name, field_var_conversions, flattened_field_var_conversions, field_function_lines, trait_doc_comment):
 868         out_typescript_bindings = ""
 869         super_instantiator = ""
 870         bindings_instantiator = ""
 871         pointer_to_adder = ""
 872         impl_constructor_arguments = ""
 873         for var in flattened_field_var_conversions:
 874             if isinstance(var, ConvInfo):
 875                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 876                 super_instantiator += first_to_lower(var.arg_name) + ", "
 877                 if var.from_hu_conv is not None:
 878                     bindings_instantiator += ", " + var.from_hu_conv[0]
 879                     if var.from_hu_conv[1] != "":
 880                         pointer_to_adder += "\t\t\t" + var.from_hu_conv[1] + ";\n"
 881                 else:
 882                     bindings_instantiator += ", " + first_to_lower(var.arg_name)
 883             else:
 884                 bindings_instantiator += ", " + first_to_lower(var[1]) + ".instance_idx!"
 885                 super_instantiator += first_to_lower(var[1]) + "_impl, "
 886                 pointer_to_adder += "\t\timpl_holder.held.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 887                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}Interface"
 888
 889         super_constructor_statements = ""
 890         trait_constructor_arguments = ""
 891         for var in field_var_conversions:
 892             if isinstance(var, ConvInfo):
 893                 trait_constructor_arguments += ", " + var.arg_name
 894             else:
 895                 super_constructor_statements += "\t\tconst " + first_to_lower(var[1]) + " = " + var[1] + ".new_impl(" + super_instantiator + ");\n"
 896                 trait_constructor_arguments += ", " + first_to_lower(var[1]) + ".instance_idx!"
 897                 for suparg in var[2]:
 898                     if isinstance(suparg, ConvInfo):
 899                         trait_constructor_arguments += ", " + suparg.arg_name
 900                     else:
 901                         trait_constructor_arguments += ", " + suparg[1]
 902
 903         # BUILD INTERFACE METHODS
 904         out_java_interface = ""
 905         out_interface_implementation_overrides = ""
 906         java_methods = []
 907         for fn_line in field_function_lines:
 908             java_method_descriptor = ""
 909             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 910                 out_java_interface += "\t/**" + fn_line.docs.replace("\n", "\n\t * ") + "\n\t */\n"
 911                 out_java_interface += "\t" + fn_line.fn_name + "("
 912                 out_interface_implementation_overrides += f"\t\t\t{fn_line.fn_name} ("
 913
 914                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 915                     if idx >= 1:
 916                         out_java_interface += ", "
 917                         out_interface_implementation_overrides += ", "
 918                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 919                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 920                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 921                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n"
 922                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 923                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 924
 925                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 926
 927                 for arg_info in fn_line.args_ty:
 928                     if arg_info.to_hu_conv is not None:
 929                         out_interface_implementation_overrides += "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 930
 931                 if fn_line.ret_ty_info.java_ty != "void":
 932                     out_interface_implementation_overrides += "\t\t\t\tconst ret: " + fn_line.ret_ty_info.java_hu_ty + " = arg." + fn_line.fn_name + "("
 933                 else:
 934                     out_interface_implementation_overrides += f"\t\t\t\targ." + fn_line.fn_name + "("
 935
 936                 for idx, arg_info in enumerate(fn_line.args_ty):
 937                     if idx != 0:
 938                         out_interface_implementation_overrides += ", "
 939                     if arg_info.to_hu_conv_name is not None:
 940                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 941                     else:
 942                         out_interface_implementation_overrides += arg_info.arg_name
 943
 944                 out_interface_implementation_overrides += ");\n"
 945                 if fn_line.ret_ty_info.java_ty != "void":
 946                     if fn_line.ret_ty_info.from_hu_conv is not None:
 947                         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"
 948                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 949                             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"
 950                         #if fn_line.ret_ty_info.rust_obj in result_types:
 951                         # XXX: We need to handle this in conversion logic so that its cross-language!
 952                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 953                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 954                         out_interface_implementation_overrides += "\t\t\t\treturn result;\n"
 955                     else:
 956                         out_interface_implementation_overrides += "\t\t\t\treturn ret;\n"
 957                 out_interface_implementation_overrides += f"\t\t\t}},\n"
 958
 959         formatted_trait_docs = trait_doc_comment.replace("\n", "\n * ")
 960         out_typescript_human = f"""
 961 {self.hu_struct_file_prefix}
 962
 963 /** An implementation of {struct_name.replace("LDK","")} */
 964 export interface {struct_name.replace("LDK", "")}Interface {{
 965 {out_java_interface}}}
 966
 967 class {struct_name}Holder {{
 968         held: {struct_name.replace("LDK", "")}|null = null;
 969 }}
 970
 971 /**
 972  * {formatted_trait_docs}
 973  */
 974 export class {struct_name.replace("LDK","")} extends CommonBase {{
 975         /* @internal */
 976         public bindings_instance: bindings.{struct_name}|null;
 977
 978         /* @internal */
 979         public instance_idx?: number;
 980
 981         /* @internal */
 982         constructor(_dummy: null, ptr: bigint) {{
 983                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
 984                 this.bindings_instance = null;
 985         }}
 986
 987         /** Creates a new instance of {struct_name.replace("LDK","")} from a given implementation */
 988         public static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 989                 const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 990                 let structImplementation = {{
 991 {out_interface_implementation_overrides}                }} as bindings.{struct_name};
 992 {super_constructor_statements}          const ptr_idx: [bigint, number] = bindings.{struct_name}_new(structImplementation{bindings_instantiator});
 993
 994                 impl_holder.held = new {struct_name.replace("LDK", "")}(null, ptr_idx[0]);
 995                 impl_holder.held.instance_idx = ptr_idx[1];
 996                 impl_holder.held.bindings_instance = structImplementation;
 997 {pointer_to_adder}              return impl_holder.held!;
 998         }}
 999
1000 """
1001         self.obj_defined([struct_name.replace("LDK", ""), struct_name.replace("LDK", "") + "Interface"], "structs")
1002
1003         out_typescript_bindings += "/* @internal */\nexport interface " + struct_name + " {\n"
1004         java_meths = []
1005         for fn_line in field_function_lines:
1006             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
1007                 out_typescript_bindings += f"\t{fn_line.fn_name} ("
1008
1009                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
1010                     if idx >= 1:
1011                         out_typescript_bindings = out_typescript_bindings + ", "
1012                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
1013
1014                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
1015
1016         out_typescript_bindings += "}\n\n"
1017
1018         c_call_extra_args = ""
1019         out_typescript_bindings += f"/* @internal */\nexport function {struct_name}_new(impl: {struct_name}"
1020         for var in flattened_field_var_conversions:
1021             if isinstance(var, ConvInfo):
1022                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
1023                 c_call_extra_args += f", {var.arg_name}"
1024             else:
1025                 out_typescript_bindings += f", {var[1]}: number"
1026                 c_call_extra_args += f", {var[1]}"
1027
1028
1029         out_typescript_bindings += f"""): [bigint, number] {{
1030         if(!isWasmInitialized) {{
1031                 throw new Error("initializeWasm() must be awaited first!");
1032         }}
1033         var new_obj_idx = js_objs.length;
1034         for (var i = 0; i < js_objs.length; i++) {{
1035                 if (js_objs[i] == null || js_objs[i] == undefined) {{ new_obj_idx = i; break; }}
1036         }}
1037         js_objs[i] = new WeakRef(impl);
1038         return [wasm.TS_{struct_name}_new(i{c_call_extra_args}), i];
1039 }}
1040 """
1041
1042         # Now that we've written out our java code (and created java_meths), generate C
1043         out_c = "typedef struct " + struct_name + "_JCalls {\n"
1044         out_c += "\tatomic_size_t refcnt;\n"
1045         out_c += "\tuint32_t instance_ptr;\n"
1046         for var in flattened_field_var_conversions:
1047             if isinstance(var, ConvInfo):
1048                 # We're a regular ol' field
1049                 pass
1050             else:
1051                 # We're a supertrait
1052                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
1053         out_c = out_c + "} " + struct_name + "_JCalls;\n"
1054
1055         for fn_line in field_function_lines:
1056             if fn_line.fn_name == "free":
1057                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
1058                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
1059                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
1060                 out_c = out_c + "\t\tFREE(j_calls);\n"
1061                 out_c = out_c + "\t}\n}\n"
1062
1063         for idx, fn_line in enumerate(field_function_lines):
1064             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
1065                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
1066                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
1067                 if fn_line.self_is_const:
1068                     out_c = out_c + "const void* this_arg"
1069                 else:
1070                     out_c = out_c + "void* this_arg"
1071
1072                 for idx, arg in enumerate(fn_line.args_ty):
1073                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
1074
1075                 out_c = out_c + ") {\n"
1076                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
1077
1078                 for arg_info in fn_line.args_ty:
1079                     if arg_info.ret_conv is not None:
1080                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
1081                         out_c = out_c + arg_info.arg_name
1082                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
1083
1084                 fn_suffix = ""
1085                 assert len(fn_line.args_ty) < 7
1086                 for arg_info in fn_line.args_ty:
1087                     if arg_info.c_ty == "uint64_t" or arg_info.c_ty == "int64_t":
1088                         fn_suffix += "b"
1089                     else:
1090                         fn_suffix += "u"
1091                 for i in range(0, 6 - len(fn_line.args_ty)):
1092                     fn_suffix += "u"
1093                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
1094                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (" + fn_line.ret_ty_info.c_ty + ")"
1095                     out_c += "js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1096                 elif fn_line.ret_ty_info.java_ty == "void":
1097                     out_c = out_c + "\tjs_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1098                 elif fn_line.ret_ty_info.java_hu_ty == "string":
1099                     out_c += "\tjstring ret = (jstring)js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1100                 elif fn_line.ret_ty_info.arg_conv is None:
1101                     out_c += "\treturn js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1102                 else:
1103                     out_c += "\tuint64_t ret = js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1104
1105                 self.function_ptrs[self.function_ptr_counter] = (struct_name, fn_line.fn_name)
1106                 self.function_ptr_counter += 1
1107
1108                 for idx, arg_info in enumerate(fn_line.args_ty):
1109                     if arg_info.ret_conv is not None:
1110                         if arg_info.c_ty.endswith("Array"):
1111                             out_c += ", (uint32_t)" + arg_info.ret_conv_name
1112                         else:
1113                             out_c += ", " + arg_info.ret_conv_name
1114                     else:
1115                         assert False # TODO: Would we need some conversion here?
1116                         out_c += ", (uint32_t)" + arg_info.arg_name
1117                 for i in range(0, 6 - len(fn_line.args_ty)):
1118                     out_c += ", 0"
1119                 out_c = out_c + ");\n"
1120                 if fn_line.ret_ty_info.arg_conv is not None:
1121                     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"
1122
1123                 out_c = out_c + "}\n"
1124
1125         # Write out a clone function whether we need one or not, as we use them in moving to rust
1126         out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
1127         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
1128         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
1129         for var in field_var_conversions:
1130             if not isinstance(var, ConvInfo):
1131                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
1132         out_c = out_c + "}\n"
1133
1134         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (JSValue o"
1135         for var in flattened_field_var_conversions:
1136             if isinstance(var, ConvInfo):
1137                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
1138             else:
1139                 out_c = out_c + ", JSValue " + var[1]
1140         out_c = out_c + ") {\n"
1141
1142         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
1143         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
1144         out_c = out_c + "\tcalls->instance_ptr = o;\n"
1145
1146         for (fn_name, java_meth_descr) in java_meths:
1147             if fn_name != "free" and fn_name != "cloned":
1148                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
1149                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
1150
1151         for var in flattened_field_var_conversions:
1152             if isinstance(var, ConvInfo) and var.arg_conv is not None:
1153                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
1154         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
1155         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
1156         for fn_line in field_function_lines:
1157             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
1158                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
1159             elif fn_line.fn_name == "free":
1160                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
1161             else:
1162                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
1163         for var in field_var_conversions:
1164             if isinstance(var, ConvInfo):
1165                 if var.arg_conv_name is not None:
1166                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
1167                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
1168                 else:
1169                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
1170                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
1171             else:
1172                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(" + var[1]
1173                 for suparg in var[2]:
1174                     if isinstance(suparg, ConvInfo):
1175                         out_c += ", " + suparg.arg_name
1176                     else:
1177                         out_c += ", " + suparg[1]
1178                 out_c += "),\n"
1179         out_c = out_c + "\t};\n"
1180         for var in flattened_field_var_conversions:
1181             if not isinstance(var, ConvInfo):
1182                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
1183         out_c = out_c + "\treturn ret;\n"
1184         out_c = out_c + "}\n"
1185
1186         out_c = out_c + self.c_fn_ty_pfx + "uint64_t " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "JSValue o"
1187         for var in flattened_field_var_conversions:
1188             if isinstance(var, ConvInfo):
1189                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
1190             else:
1191                 out_c = out_c + ", JSValue " + var[1]
1192         out_c = out_c + ") {\n"
1193         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
1194         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(o"
1195         for var in flattened_field_var_conversions:
1196             if isinstance(var, ConvInfo):
1197                 out_c = out_c + ", " + var.arg_name
1198             else:
1199                 out_c = out_c + ", " + var[1]
1200         out_c = out_c + ");\n"
1201         out_c = out_c + "\treturn tag_ptr(res_ptr, true);\n"
1202         out_c = out_c + "}\n"
1203
1204         return (out_typescript_bindings, out_typescript_human, out_c)
1205
1206     def trait_struct_inc_refcnt(self, ty_info):
1207         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
1208         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
1209         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_cloned(&" + ty_info.var_name + "_conv);\n}"
1210         return base_conv
1211
1212     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
1213         bindings_type = struct_name.replace("LDK", "")
1214         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
1215
1216         out_java_enum = ""
1217         out_java = ""
1218         out_c = ""
1219
1220         out_java_enum += (self.hu_struct_file_prefix)
1221
1222         java_hu_class = "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
1223         java_hu_class += "export class " + java_hu_type + " extends CommonBase {\n"
1224         java_hu_class += "\tprotected constructor(_dummy: null, ptr: bigint) { super(ptr, bindings." + bindings_type + "_free); }\n"
1225         java_hu_class += "\t/* @internal */\n"
1226         java_hu_class += f"\tpublic static constr_from_ptr(ptr: bigint): {java_hu_type} {{\n"
1227         java_hu_class += f"\t\tconst raw_ty: number = bindings." + struct_name + "_ty_from_ptr(ptr);\n"
1228         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"
1229         out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)untag_ptr(ptr);\n"
1230         out_c += "\tswitch(obj->tag) {\n"
1231         java_hu_class += "\t\tswitch (raw_ty) {\n"
1232         java_hu_subclasses = ""
1233
1234         out_java += "/* @internal */\nexport class " + struct_name + " {\n"
1235         out_java += "\tprotected constructor() {}\n"
1236         var_idx = 0
1237         for var in variant_list:
1238             java_hu_subclasses += "/** A " + java_hu_type + " of type " + var.var_name + " */\n"
1239             java_hu_subclasses += "export class " + java_hu_type + "_" + var.var_name + " extends " + java_hu_type + " {\n"
1240             java_hu_class += f"\t\t\tcase {var_idx}: "
1241             java_hu_class += "return new " + java_hu_type + "_" + var.var_name + "(ptr);\n"
1242             out_c += f"\t\tcase {struct_name}_{var.var_name}: return {var_idx};\n"
1243             hu_conv_body = ""
1244             for idx, (field_ty, field_docs) in enumerate(var.fields):
1245                 if field_docs is not None:
1246                     java_hu_subclasses += "\t/**\n\t * " + field_docs.replace("\n", "\n\t * ") + "\n\t */\n"
1247                 java_hu_subclasses += "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
1248                 if field_ty.to_hu_conv is not None:
1249                     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"
1250                     hu_conv_body += f"\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1251                     hu_conv_body += f"\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1252                 else:
1253                     hu_conv_body += f"\t\tthis.{field_ty.arg_name} = bindings.{struct_name}_{var.var_name}_get_{field_ty.arg_name}(ptr);\n"
1254             java_hu_subclasses += "\t/* @internal */\n"
1255             java_hu_subclasses += "\tpublic constructor(ptr: bigint) {\n\t\tsuper(null, ptr);\n"
1256             java_hu_subclasses = java_hu_subclasses + hu_conv_body
1257             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
1258             var_idx += 1
1259         out_java += "}\n"
1260         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"
1261         out_java += self.fn_call_body(struct_name + "_ty_from_ptr", "uint32_t", "number", "ptr: bigint", "ptr")
1262         out_c += ("\t\tdefault: abort();\n")
1263         out_c += ("\t}\n}\n")
1264
1265         for var in variant_list:
1266             for idx, (field_map, _) in enumerate(var.fields):
1267                 fn_name = f"{struct_name}_{var.var_name}_get_{field_map.arg_name}"
1268                 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"
1269                 out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)untag_ptr(ptr);\n"
1270                 out_c += f"\tassert(obj->tag == {struct_name}_{var.var_name});\n"
1271                 if field_map.ret_conv is not None:
1272                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1273                     if var.tuple_variant:
1274                         out_c += "obj->" + camel_to_snake(var.var_name)
1275                     else:
1276                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
1277                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1278                     out_c += "\treturn " + field_map.ret_conv_name + ";\n"
1279                 else:
1280                     if var.tuple_variant:
1281                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + ";\n"
1282                     else:
1283                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name + ";\n"
1284                 out_c += "}\n"
1285                 out_java += self.fn_call_body(fn_name, field_map.c_ty, field_map.java_ty, "ptr: bigint", "ptr")
1286         out_java_enum += java_hu_class
1287         self.struct_file_suffixes[java_hu_type] = java_hu_subclasses
1288         self.obj_defined([java_hu_type], "structs")
1289         return (out_java, out_java_enum, out_c)
1290
1291     def map_opaque_struct(self, struct_name, struct_doc_comment):
1292         method_header = ""
1293
1294         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
1295         out_opaque_struct_human = f"{self.hu_struct_file_prefix}"
1296         extra_docs = ""
1297         extra_body = ""
1298         if struct_name.startswith("LDKLocked") or struct_name.startswith("LDKReadOnly"):
1299             extra_docs = "\n\tThis type represents a lock and MUST BE MANUALLY FREE'd!" # XXX: There's a thing for this
1300             constructor_body = 'super(ptr, () => { throw new Error("Locks must be manually freed with free()"); });'
1301             extra_body = f"""
1302         /** Releases this lock */
1303         public free() {{
1304                 bindings.{struct_name.replace("LDK","")}_free(this.ptr);
1305                 CommonBase.set_null_skip_free(this);
1306         }}"""
1307         formatted_doc_comment = struct_doc_comment.replace("\n", "\n\t")
1308         out_opaque_struct_human += f"""
1309 class {hu_name} {{
1310         \"\"\"{extra_docs}
1311         {formatted_doc_comment}
1312         \"\"\"
1313         def __init__(_dummy: null, ptr: int):
1314                 self.ptr = ptr
1315
1316         def __del__(self):
1317                 bindings.{struct_name.replace("LDK","")}_free(self.ptr)
1318 {extra_body}
1319
1320 """
1321         self.obj_defined([hu_name], "structs")
1322         return out_opaque_struct_human
1323
1324     def map_tuple(self, struct_name):
1325         return self.map_opaque_struct(struct_name, "A Tuple")
1326
1327     def map_result(self, struct_name, res_map, err_map):
1328         human_ty = struct_name.replace("LDKCResult", "Result")
1329
1330         suffixes = f"export class {human_ty}_OK extends {human_ty} {{\n"
1331         if res_map.java_hu_ty != "void":
1332             suffixes += "\tpublic res: " + res_map.java_hu_ty + ";\n"
1333         suffixes += f"""
1334         /* @internal */
1335         public constructor(_dummy: null, ptr: bigint) {{
1336                 super(_dummy, ptr);
1337 """
1338         if res_map.java_hu_ty == "void":
1339             pass
1340         elif res_map.to_hu_conv is not None:
1341             suffixes += "\t\tconst res: " + res_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1342             suffixes += "\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t")
1343             suffixes += "\n\t\tthis.res = " + res_map.to_hu_conv_name + ";\n"
1344         else:
1345             suffixes += "\t\tthis.res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1346         suffixes += "\t}\n}\n"
1347
1348         suffixes += f"export class {human_ty}_Err extends {human_ty} {{\n"
1349         if err_map.java_hu_ty != "void":
1350             suffixes += "\tpublic err: " + err_map.java_hu_ty + ";\n"
1351         suffixes += f"""
1352         /* @internal */
1353         public constructor(_dummy: null, ptr: bigint) {{
1354                 super(_dummy, ptr);
1355 """
1356         if err_map.java_hu_ty == "void":
1357             pass
1358         elif err_map.to_hu_conv is not None:
1359             suffixes += "\t\tconst err: " + err_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1360             suffixes += "\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t")
1361             suffixes += "\n\t\tthis.err = " + err_map.to_hu_conv_name + ";\n"
1362         else:
1363             suffixes += "\t\tthis.err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1364         suffixes += "\t}\n}"
1365
1366         self.struct_file_suffixes[human_ty] = suffixes
1367         self.obj_defined([human_ty], "structs")
1368
1369         return f"""{self.hu_struct_file_prefix}
1370
1371 export class {human_ty} extends CommonBase {{
1372         protected constructor(_dummy: null, ptr: bigint) {{
1373                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1374         }}
1375         /* @internal */
1376         public static constr_from_ptr(ptr: bigint): {human_ty} {{
1377                 if (bindings.{struct_name.replace("LDK", "")}_is_ok(ptr)) {{
1378                         return new {human_ty}_OK(null, ptr);
1379                 }} else {{
1380                         return new {human_ty}_Err(null, ptr);
1381                 }}
1382         }}
1383 """
1384
1385     def fn_call_body(self, method_name, return_c_ty, return_java_ty, method_argument_string, native_call_argument_string):
1386         has_return_value = return_c_ty != 'void'
1387         return_statement = 'return nativeResponseValue;'
1388         if not has_return_value:
1389             return_statement = '// debug statements here'
1390
1391         return f"""/* @internal */
1392 export function {method_name}({method_argument_string}): {return_java_ty} {{
1393         if(!isWasmInitialized) {{
1394                 throw new Error("initializeWasm() must be awaited first!");
1395         }}
1396         const nativeResponseValue = wasm.TS_{method_name}({native_call_argument_string});
1397         {return_statement}
1398 }}
1399 """
1400     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):
1401         out_java = ""
1402         out_c = ""
1403         out_java_struct = None
1404
1405         out_java += ("\t")
1406         out_c += (self.c_fn_ty_pfx)
1407         out_c += (return_type_info.c_ty)
1408         out_java += (return_type_info.java_ty)
1409         if return_type_info.ret_conv is not None:
1410             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1411         out_java += (" " + method_name + "(")
1412         out_c += (" "  + self.c_fn_name_define_pfx(method_name, True))
1413
1414         method_argument_string = ""
1415         native_call_argument_string = ""
1416         for idx, arg_conv_info in enumerate(argument_types):
1417             if idx != 0:
1418                 method_argument_string += (", ")
1419                 native_call_argument_string += ', '
1420                 out_c += (", ")
1421             if arg_conv_info.c_ty != "void":
1422                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1423                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
1424                 native_call_argument_string += arg_conv_info.arg_name
1425         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)
1426
1427         out_java_struct = ""
1428         if doc_comment is not None:
1429             out_java_struct = "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
1430
1431         if not args_known:
1432             out_java_struct += ("\t// Skipped " + method_name + "\n")
1433         else:
1434             if not takes_self:
1435                 out_java_struct += (
1436                         "\tpublic static constructor_" + meth_n + "(")
1437             else:
1438                 out_java_struct += ("\tpublic " + meth_n + "(")
1439             for idx, arg in enumerate(argument_types):
1440                 if idx != 0:
1441                     if not takes_self or idx > 1:
1442                         out_java_struct += (", ")
1443                 elif takes_self:
1444                     continue
1445                 if arg.java_ty != "void":
1446                     if arg.arg_name in default_constructor_args:
1447                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1448                             if explode_idx != 0:
1449                                 out_java_struct += (", ")
1450                             out_java_struct += arg.arg_name + "_" + explode_arg.arg_name + ": " + explode_arg.java_hu_ty
1451                     else:
1452                         out_java_struct += arg.arg_name + ": " + arg.java_hu_ty
1453                         if arg.nullable:
1454                             out_java_struct += "|null"
1455
1456         out_c += (") {\n")
1457         if out_java_struct is not None:
1458             out_java_struct += "): " + return_type_info.java_hu_ty + " {\n"
1459         for info in argument_types:
1460             if info.arg_conv is not None:
1461                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1462         if return_type_info.ret_conv is not None:
1463             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1464         elif return_type_info.c_ty != "void":
1465             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1466         else:
1467             out_c += ("\t")
1468         if c_call_string is None:
1469             out_c += (method_name + "(")
1470         else:
1471             out_c += (c_call_string)
1472         for idx, info in enumerate(argument_types):
1473             if info.arg_conv_name is not None:
1474                 if idx != 0:
1475                     out_c += (", ")
1476                 elif c_call_string is not None:
1477                     continue
1478                 out_c += (info.arg_conv_name)
1479         out_c += (")")
1480         if return_type_info.ret_conv is not None:
1481             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1482         else:
1483             out_c += (";")
1484         for info in argument_types:
1485             if info.arg_conv_cleanup is not None:
1486                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1487         if return_type_info.ret_conv is not None:
1488             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1489         elif return_type_info.c_ty != "void":
1490             out_c += ("\n\treturn ret_val;")
1491         out_c += ("\n}\n\n")
1492
1493         if args_known:
1494             out_java_struct += ("\t\t")
1495             if return_type_info.java_ty != "void":
1496                 out_java_struct += "const ret: " + return_type_info.java_ty + " = "
1497             out_java_struct += ("bindings." + method_name + "(")
1498             for idx, info in enumerate(argument_types):
1499                 if idx != 0:
1500                     out_java_struct += (", ")
1501                 if idx == 0 and takes_self:
1502                     out_java_struct += ("this.ptr")
1503                 elif info.arg_name in default_constructor_args:
1504                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1505                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1506                         if explode_idx != 0:
1507                             out_java_struct += (", ")
1508                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1509                         if explode_arg.from_hu_conv is not None:
1510                             out_java_struct += (
1511                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1512                         else:
1513                             out_java_struct += (expl_arg_name)
1514                     out_java_struct += (")")
1515                 elif info.from_hu_conv is not None:
1516                     out_java_struct += (info.from_hu_conv[0])
1517                 else:
1518                     out_java_struct += (info.arg_name)
1519             out_java_struct += (");\n")
1520             if return_type_info.to_hu_conv is not None:
1521                 if not takes_self:
1522                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1523                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1524                 else:
1525                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1526
1527             for idx, info in enumerate(argument_types):
1528                 if idx == 0 and takes_self:
1529                     pass
1530                 elif info.arg_name in default_constructor_args:
1531                     for explode_arg in default_constructor_args[info.arg_name]:
1532                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1533                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1534                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1535                                                                                              expl_arg_name).replace(
1536                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1537                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1538                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1539                         out_java_struct += (
1540                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1541                     else:
1542                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1543
1544             if return_type_info.to_hu_conv_name is not None:
1545                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1546             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1547                 out_java_struct += ("\t\treturn ret;\n")
1548             out_java_struct += ("\t}\n\n")
1549
1550         return (out_java, out_c, out_java_struct)
1551
1552     def cleanup(self):
1553         for struct in self.struct_file_suffixes:
1554             with open(self.outdir + "/structs/" + struct + self.file_ext, "a") as src:
1555                 src.write(self.struct_file_suffixes[struct])
1556
1557         with open(self.outdir + "/bindings.py", "a") as bindings:
1558             bindings.write("""
1559
1560 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) {
1561         const weak: WeakRef<object>|undefined = js_objs[obj_ptr];
1562         if (weak == null || weak == undefined) {
1563                 console.error("Got function call on unknown/free'd JS object!");
1564                 throw new Error("Got function call on unknown/free'd JS object!");
1565         }
1566         const obj = weak.deref();
1567         if (obj == null || obj == undefined) {
1568                 console.error("Got function call on GC'd JS object!");
1569                 throw new Error("Got function call on GC'd JS object!");
1570         }
1571         var fn;
1572 """)
1573             bindings.write("\tswitch (fn_id) {\n")
1574             for f in self.function_ptrs:
1575                 bindings.write(f"\t\tcase {str(f)}: fn = Object.getOwnPropertyDescriptor(obj, \"{self.function_ptrs[f][1]}\"); break;\n")
1576
1577             bindings.write("""\t\tdefault:
1578                         console.error("Got unknown function call from C!");
1579                         throw new Error("Got unknown function call from C!");
1580         }
1581         if (fn == null || fn == undefined) {
1582                 console.error("Got function call on incorrect JS object!");
1583                 throw new Error("Got function call on incorrect JS object!");
1584         }
1585         const ret = fn.value.bind(obj)(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10);
1586         if (ret === undefined || ret === null) return BigInt(0);
1587         return BigInt(ret);
1588 }""")