_ Git - ldk-java/blob - typescript_strings.py

   1 from bindingstypes import ConvInfo
   2 from enum import Enum
   3
   4 def first_to_lower(string: str) -> str:
   5     first = string[0]
   6     return first.lower() + string[1:]
   7
   8
   9 class Target(Enum):
  10     NODEJS = 1,
  11     BROWSER = 2
  12
  13 class Consts:
  14     def __init__(self, DEBUG: bool, target: Target, outdir: str, **kwargs):
  15         self.outdir = outdir
  16         self.struct_file_suffixes = {}
  17         self.function_ptr_counter = 0
  18         self.function_ptrs = {}
  19         self.c_type_map = dict(
  20             uint8_t = ['number', 'number', 'Uint8Array'],
  21             uint16_t = ['number', 'number', 'Uint16Array'],
  22             uint32_t = ['number', 'number', 'Uint32Array'],
  23             uint64_t = ['bigint', 'bigint', 'BigUint64Array'],
  24         )
  25         self.java_type_map = dict(
  26             String = "number"
  27         )
  28         self.java_hu_type_map = dict(
  29             String = "string"
  30         )
  31
  32         self.to_hu_conv_templates = dict(
  33             ptr = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  34             default = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  35         )
  36
  37         self.bindings_header = """
  38 import * as version from './version.mjs';
  39
  40 const imports: any = {};
  41 imports.env = {};
  42
  43 var js_objs: Array<WeakRef<object>> = [];
  44 var js_invoke: Function;
  45 var getRandomValues: Function;
  46
  47 imports.wasi_snapshot_preview1 = {
  48         "fd_write": (fd: number, iovec_array_ptr: number, iovec_array_len: number) => {
  49                 // This should generally only be used to print panic messages
  50                 console.log("FD_WRITE to " + fd + " in " + iovec_array_len + " chunks.");
  51                 const ptr_len_view = new Uint32Array(wasm.memory.buffer, iovec_array_ptr, iovec_array_len * 2);
  52                 for (var i = 0; i < iovec_array_len; i++) {
  53                         const bytes_view = new Uint8Array(wasm.memory.buffer, ptr_len_view[i*2], ptr_len_view[i*2+1]);
  54                         console.log(String.fromCharCode(...bytes_view));
  55                 }
  56                 return 0;
  57         },
  58         "fd_close": (_fd: number) => {
  59                 // This is not generally called, but may be referenced in debug builds
  60                 console.log("wasi_snapshot_preview1:fd_close");
  61                 return 58; // Not Supported
  62         },
  63         "fd_seek": (_fd: number, _offset: bigint, _whence: number, _new_offset: number) => {
  64                 // This is not generally called, but may be referenced in debug builds
  65                 console.log("wasi_snapshot_preview1:fd_seek");
  66                 return 58; // Not Supported
  67         },
  68         "random_get": (buf_ptr: number, buf_len: number) => {
  69                 const buf = new Uint8Array(wasm.memory.buffer, buf_ptr, buf_len);
  70                 getRandomValues(buf);
  71                 return 0;
  72         },
  73         "environ_sizes_get": (environ_var_count_ptr: number, environ_len_ptr: number) => {
  74                 // This is called before fd_write to format + print panic messages
  75                 console.log("wasi_snapshot_preview1:environ_sizes_get");
  76                 const out_count_view = new Uint32Array(wasm.memory.buffer, environ_var_count_ptr, 1);
  77                 out_count_view[0] = 0;
  78                 const out_len_view = new Uint32Array(wasm.memory.buffer, environ_len_ptr, 1);
  79                 out_len_view[0] = 0;
  80                 return 0;
  81         },
  82         "environ_get": (environ_ptr: number, environ_buf_ptr: number) => {
  83                 // This is called before fd_write to format + print panic messages
  84                 console.log("wasi_snapshot_preview1:environ_get");
  85                 return 58; // Note supported - we said there were 0 environment entries!
  86         },
  87         "proc_exit" : () => {
  88                 console.log("wasi_snapshot_preview1:proc_exit");
  89         },
  90 };
  91
  92 var wasm: any = null;
  93 let isWasmInitialized: boolean = false;
  94
  95 async function finishInitializeWasm(wasmInstance: WebAssembly.Instance) {
  96         if (typeof crypto === "undefined") {
  97                 var crypto_import = (await import('crypto')).webcrypto;
  98                 getRandomValues = crypto_import.getRandomValues.bind(crypto_import);
  99         } else {
 100                 getRandomValues = crypto.getRandomValues.bind(crypto);
 101         }
 102
 103         wasm = wasmInstance.exports;
 104         if (!wasm.test_bigint_pass_deadbeef0badf00d(BigInt("0xdeadbeef0badf00d"))) {
 105                 throw new Error(\"Currently need BigInt-as-u64 support, try ----experimental-wasm-bigint");
 106         }
 107
 108         if (decodeString(wasm.TS_get_lib_version_string()) !== version.get_ldk_java_bindings_version())
 109                 throw new Error(\"Compiled LDK library and LDK class failes do not match\");
 110         // Fetching the LDK versions from C also checks that the header and binaries match
 111         const c_bindings_ver: number = wasm.TS_get_ldk_c_bindings_version();
 112         const ldk_ver: number = wasm.TS_get_ldk_version();
 113         if (c_bindings_ver == 0)
 114                 throw new Error(\"LDK version did not match the header we built against\");
 115         if (ldk_ver == 0)
 116                 throw new Error(\"LDK C bindings version did not match the header we built against\");
 117         const c_bindings_version: string = decodeString(c_bindings_ver)
 118         const ldk_version: string = decodeString(ldk_ver);
 119         console.log(\"Loaded LDK-Java Bindings with LDK \" + ldk_version + \" and LDK-C-Bindings \" + c_bindings_version);
 120
 121         isWasmInitialized = true;
 122 }
 123
 124 /* @internal */
 125 export async function initializeWasmFromUint8Array(wasmBinary: Uint8Array) {
 126         imports.env["js_invoke_function"] = js_invoke;
 127         const { instance: wasmInstance } = await WebAssembly.instantiate(wasmBinary, imports);
 128         await finishInitializeWasm(wasmInstance);
 129 }
 130
 131 /* @internal */
 132 export async function initializeWasmFetch(uri: string) {
 133         const stream = fetch(uri);
 134         imports.env["js_invoke_function"] = js_invoke;
 135         const { instance: wasmInstance } = await WebAssembly.instantiateStreaming(stream, imports);
 136         await finishInitializeWasm(wasmInstance);
 137 }"""
 138
 139         self.bindings_header += """
 140 // WASM CODEC
 141
 142 const nextMultipleOfFour = (value: number) => {
 143         return Math.ceil(value / 4) * 4;
 144 }
 145
 146 /* @internal */
 147 export function encodeUint8Array (inputArray: Uint8Array): number {
 148         const cArrayPointer = wasm.TS_malloc(inputArray.length + 4);
 149         const arrayLengthView = new Uint32Array(wasm.memory.buffer, cArrayPointer, 1);
 150         arrayLengthView[0] = inputArray.length;
 151         const arrayMemoryView = new Uint8Array(wasm.memory.buffer, cArrayPointer + 4, inputArray.length);
 152         arrayMemoryView.set(inputArray);
 153         return cArrayPointer;
 154 }
 155 /* @internal */
 156 export function encodeUint32Array (inputArray: Uint32Array|Array<number>): number {
 157         const cArrayPointer = wasm.TS_malloc((inputArray.length + 1) * 4);
 158         const arrayMemoryView = new Uint32Array(wasm.memory.buffer, cArrayPointer, inputArray.length);
 159         arrayMemoryView.set(inputArray, 1);
 160         arrayMemoryView[0] = inputArray.length;
 161         return cArrayPointer;
 162 }
 163 /* @internal */
 164 export function encodeUint64Array (inputArray: BigUint64Array|Array<bigint>): number {
 165         const cArrayPointer = wasm.TS_malloc(inputArray.length * 8 + 1);
 166         const arrayLengthView = new Uint32Array(wasm.memory.buffer, cArrayPointer, 1);
 167         arrayLengthView[0] = inputArray.length;
 168         const arrayMemoryView = new BigUint64Array(wasm.memory.buffer, cArrayPointer + 4, inputArray.length);
 169         arrayMemoryView.set(inputArray);
 170         return cArrayPointer;
 171 }
 172
 173 /* @internal */
 174 export function check_arr_len(arr: Uint8Array, len: number): Uint8Array {
 175         if (arr.length != len) { throw new Error("Expected array of length " + len + "got " + arr.length); }
 176         return arr;
 177 }
 178
 179 /* @internal */
 180 export function getArrayLength(arrayPointer: number): number {
 181         const arraySizeViewer = new Uint32Array(wasm.memory.buffer, arrayPointer, 1);
 182         return arraySizeViewer[0];
 183 }
 184 /* @internal */
 185 export function decodeUint8Array (arrayPointer: number, free = true): Uint8Array {
 186         const arraySize = getArrayLength(arrayPointer);
 187         const actualArrayViewer = new Uint8Array(wasm.memory.buffer, arrayPointer + 4, arraySize);
 188         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 189         // will free the underlying memory when it becomes unreachable instead of copying here.
 190         // Note that doing so may have edge-case interactions with memory resizing (invalidating the buffer).
 191         const actualArray = actualArrayViewer.slice(0, arraySize);
 192         if (free) {
 193                 wasm.TS_free(arrayPointer);
 194         }
 195         return actualArray;
 196 }
 197 const decodeUint32Array = (arrayPointer: number, free = true) => {
 198         const arraySize = getArrayLength(arrayPointer);
 199         const actualArrayViewer = new Uint32Array(
 200                 wasm.memory.buffer, // value
 201                 arrayPointer + 4, // offset (ignoring length bytes)
 202                 arraySize // uint32 count
 203         );
 204         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 205         // will free the underlying memory when it becomes unreachable instead of copying here.
 206         const actualArray = actualArrayViewer.slice(0, arraySize);
 207         if (free) {
 208                 wasm.TS_free(arrayPointer);
 209         }
 210         return actualArray;
 211 }
 212
 213
 214 export function freeWasmMemory(pointer: number) { wasm.TS_free(pointer); }
 215
 216 /* @internal */
 217 export function getU32ArrayElem(arrayPointer: number, idx: number): number {
 218         const actualArrayViewer = new Uint32Array(wasm.memory.buffer, arrayPointer + 4, idx + 1);
 219         return actualArrayViewer[idx];
 220 }
 221
 222 /* @internal */
 223 export function encodeString(str: string): number {
 224         const charArray = new TextEncoder().encode(str);
 225         return encodeUint8Array(charArray);
 226 }
 227
 228 /* @internal */
 229 export function decodeString(stringPointer: number, free = true): string {
 230         const arraySize = getArrayLength(stringPointer);
 231         const memoryView = new Uint8Array(wasm.memory.buffer, stringPointer + 4, arraySize);
 232         const result = new TextDecoder("utf-8").decode(memoryView);
 233
 234         if (free) {
 235                 wasm.TS_free(stringPointer);
 236         }
 237
 238         return result;
 239 }
 240 """
 241         if DEBUG:
 242             self.bindings_header += """
 243 /* @internal */
 244 export function getRemainingAllocationCount(): number {
 245         return wasm.TS_allocs_remaining();
 246 }
 247 /* @internal */
 248 export function debugPrintRemainingAllocs() {
 249         wasm.TS_print_leaks();
 250 }
 251 """
 252         else:
 253             self.bindings_header += "\n/* @internal */ export function getRemainingAllocationCount(): number { return 0; }\n"
 254             self.bindings_header += "/* @internal */ export function debugPrintRemainingAllocs() { }\n"
 255
 256         with open(outdir + "/index.mts", 'a') as index:
 257             index.write("""import { initializeWasmFetch, initializeWasmFromUint8Array } from './bindings.mjs';
 258 /** Initializes the WASM backend by calling `fetch()` on the given URI - Browser only */
 259 export async function initializeWasmWebFetch(uri: string) {
 260         await initializeWasmFetch(uri);
 261 }
 262 /** Initializes the WASM backend given a Uint8Array of the .wasm binary file - Browser or Node.JS */
 263 export async function initializeWasmFromBinary(bin: Uint8Array) {
 264         await initializeWasmFromUint8Array(bin);
 265 }
 266
 267 """)
 268
 269         self.bindings_version_file = """export function get_ldk_java_bindings_version(): String {
 270         return "<git_version_ldk_garbagecollected>";
 271 }"""
 272
 273         self.bindings_footer = ""
 274
 275         self.common_base = """
 276 function freer(f: () => void) { f() }
 277 const finalizer = new FinalizationRegistry(freer);
 278 function get_freeer(ptr: number, free_fn: (ptr: number) => void) {
 279         return () => {
 280                 free_fn(ptr);
 281         }
 282 }
 283
 284 export default class CommonBase {
 285         protected ptr: number;
 286         protected ptrs_to: object[] = [];
 287         protected constructor(ptr: number, free_fn: (ptr: number) => void) {
 288                 this.ptr = ptr;
 289                 if (Number.isFinite(ptr) && ptr != 0){
 290                         finalizer.register(this, get_freeer(ptr, free_fn));
 291                 }
 292         }
 293         // In Java, protected means "any subclass can access fields on any other subclass'"
 294         // In TypeScript, protected means "any subclass can access parent fields on instances of itself"
 295         // To work around this, we add accessors for other instances' protected fields here.
 296         protected static add_ref_from(holder: CommonBase, referent: object) {
 297                 holder.ptrs_to.push(referent);
 298         }
 299         protected static get_ptr_of(o: CommonBase) {
 300                 return o.ptr;
 301         }
 302         protected static set_null_skip_free(o: CommonBase) {
 303                 o.ptr = 0;
 304                 finalizer.unregister(o);
 305         }
 306 }
 307 """
 308
 309         self.txout_defn = """export class TxOut extends CommonBase {
 310         /** The script_pubkey in this output */
 311         public script_pubkey: Uint8Array;
 312         /** The value, in satoshis, of this output */
 313         public value: bigint;
 314
 315         /* @internal */
 316         public constructor(_dummy: object, ptr: number) {
 317                 super(ptr, bindings.TxOut_free);
 318                 this.script_pubkey = bindings.decodeUint8Array(bindings.TxOut_get_script_pubkey(ptr));
 319                 this.value = bindings.TxOut_get_value(ptr);
 320         }
 321         public constructor_new(value: bigint, script_pubkey: Uint8Array): TxOut {
 322                 return new TxOut(null, bindings.TxOut_new(bindings.encodeUint8Array(script_pubkey), value));
 323         }
 324 }"""
 325         self.obj_defined(["TxOut"], "structs")
 326
 327         self.c_file_pfx = """#include "js-wasm.h"
 328 #include <stdatomic.h>
 329 #include <lightning.h>
 330
 331 // These should be provided...somehow...
 332 void *memset(void *s, int c, size_t n);
 333 void *memcpy(void *dest, const void *src, size_t n);
 334 int memcmp(const void *s1, const void *s2, size_t n);
 335
 336 extern void __attribute__((noreturn)) abort(void);
 337 static inline void assert(bool expression) {
 338         if (!expression) { abort(); }
 339 }
 340
 341 uint32_t __attribute__((export_name("test_bigint_pass_deadbeef0badf00d"))) test_bigint_pass_deadbeef0badf00d(uint64_t val) {
 342         return val == 0xdeadbeef0badf00dULL;
 343 }
 344
 345 """
 346
 347         if not DEBUG:
 348             self.c_file_pfx += """
 349 void *malloc(size_t size);
 350 void free(void *ptr);
 351
 352 #define MALLOC(a, _) malloc(a)
 353 #define do_MALLOC(a, _b, _c) malloc(a)
 354 #define FREE(p) if ((unsigned long)(p) > 4096) { free(p); }
 355 #define DO_ASSERT(a) (void)(a)
 356 #define CHECK(a)
 357 #define CHECK_ACCESS(p)
 358 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v)
 359 """
 360         else:
 361             self.c_file_pfx += """
 362 extern int snprintf(char *str, size_t size, const char *format, ...);
 363 typedef int32_t ssize_t;
 364 ssize_t write(int fd, const void *buf, size_t count);
 365 #define DEBUG_PRINT(...) do { \\
 366         char debug_str[1024]; \\
 367         int s_len = snprintf(debug_str, 1023, __VA_ARGS__); \\
 368         write(2, debug_str, s_len); \\
 369 } while (0);
 370
 371 // Always run a, then assert it is true:
 372 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 373 // Assert a is true or do nothing
 374 #define CHECK(a) DO_ASSERT(a)
 375
 376 // Running a leak check across all the allocations and frees of the JDK is a mess,
 377 // so instead we implement our own naive leak checker here, relying on the -wrap
 378 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 379 // and free'd in Rust or C across the generated bindings shared library.
 380
 381 #define BT_MAX 128
 382 typedef struct allocation {
 383         struct allocation* next;
 384         void* ptr;
 385         const char* struct_name;
 386         int lineno;
 387 } allocation;
 388 static allocation* allocation_ll = NULL;
 389 static allocation* freed_ll = NULL;
 390
 391 extern void* __real_malloc(size_t len);
 392 extern void* __real_calloc(size_t nmemb, size_t len);
 393 extern void* __real_aligned_alloc(size_t alignment, size_t size);
 394 static void new_allocation(void* res, const char* struct_name, int lineno) {
 395         allocation* new_alloc = __real_malloc(sizeof(allocation));
 396         new_alloc->ptr = res;
 397         new_alloc->struct_name = struct_name;
 398         new_alloc->next = allocation_ll;
 399         new_alloc->lineno = lineno;
 400         allocation_ll = new_alloc;
 401 }
 402 static void* do_MALLOC(size_t len, const char* struct_name, int lineno) {
 403         void* res = __real_malloc(len);
 404         new_allocation(res, struct_name, lineno);
 405         return res;
 406 }
 407 #define MALLOC(len, struct_name) do_MALLOC(len, struct_name, __LINE__)
 408
 409 void __real_free(void* ptr);
 410 static void alloc_freed(void* ptr, int lineno) {
 411         allocation* p = NULL;
 412         allocation* it = allocation_ll;
 413         while (it->ptr != ptr) {
 414                 p = it; it = it->next;
 415                 if (it == NULL) {
 416                         p = NULL;
 417                         it = freed_ll;
 418                         while (it && it->ptr != ptr) { p = it; it = it->next; }
 419                         if (it == NULL) {
 420                                 DEBUG_PRINT("Tried to free unknown pointer %p at line %d.\\n", ptr, lineno);
 421                         } else {
 422                                 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);
 423                         }
 424                         abort();
 425                 }
 426         }
 427         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 428         DO_ASSERT(it->ptr == ptr);
 429         it->next = freed_ll;
 430         freed_ll = it;
 431 }
 432 static void do_FREE(void* ptr, int lineno) {
 433         if ((unsigned long)ptr <= 4096) return; // Rust loves to create pointers to the NULL page for dummys
 434         alloc_freed(ptr, lineno);
 435         __real_free(ptr);
 436 }
 437 #define FREE(ptr) do_FREE(ptr, __LINE__)
 438
 439 static void CHECK_ACCESS(const void* ptr) {
 440         allocation* it = allocation_ll;
 441         while (it->ptr != ptr) {
 442                 it = it->next;
 443                 if (it == NULL) {
 444                         return; // addrsan should catch malloc-unknown and print more info than we have
 445                 }
 446         }
 447 }
 448 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v) \\
 449         if (v.is_owned && v.inner != NULL) { \\
 450                 const void *p = __unmangle_inner_ptr(v.inner); \\
 451                 if (p != NULL) { \\
 452                         CHECK_ACCESS(p); \\
 453                 } \\
 454         }
 455
 456 void* __wrap_malloc(size_t len) {
 457         void* res = __real_malloc(len);
 458         new_allocation(res, "malloc call", 0);
 459         return res;
 460 }
 461 void* __wrap_calloc(size_t nmemb, size_t len) {
 462         void* res = __real_calloc(nmemb, len);
 463         new_allocation(res, "calloc call", 0);
 464         return res;
 465 }
 466 void* __wrap_aligned_alloc(size_t alignment, size_t size) {
 467         void* res = __real_aligned_alloc(alignment, size);
 468         new_allocation(res, "aligned_alloc call", 0);
 469         return res;
 470 }
 471 void __wrap_free(void* ptr) {
 472         if (ptr == NULL) return;
 473         alloc_freed(ptr, 0);
 474         __real_free(ptr);
 475 }
 476
 477 void* __real_realloc(void* ptr, size_t newlen);
 478 void* __wrap_realloc(void* ptr, size_t len) {
 479         if (ptr != NULL) alloc_freed(ptr, 0);
 480         void* res = __real_realloc(ptr, len);
 481         new_allocation(res, "realloc call", 0);
 482         return res;
 483 }
 484 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 485         // Rust doesn't seem to use reallocarray currently
 486         DO_ASSERT(false);
 487 }
 488
 489 uint32_t __attribute__((export_name("TS_allocs_remaining"))) allocs_remaining() {
 490         uint32_t count = 0;
 491         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 492                 count++;
 493         }
 494         return count;
 495 }
 496 void __attribute__((export_name("TS_print_leaks"))) print_leaks() {
 497         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 498                 DEBUG_PRINT("%s %p remains. Allocated on line %d\\n", a->struct_name, a->ptr, a->lineno);
 499         }
 500 }
 501 """
 502         self.c_file_pfx = self.c_file_pfx + """
 503 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 504 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 505 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 506 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 507
 508 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 509
 510 #define DECL_ARR_TYPE(ty, name) \\
 511         struct name##array { \\
 512                 uint32_t arr_len; \\
 513                 ty elems[]; \\
 514         }; \\
 515         typedef struct name##array * name##Array; \\
 516         static inline name##Array init_##name##Array(size_t arr_len, int lineno) { \\
 517                 name##Array arr = (name##Array)do_MALLOC(arr_len * sizeof(ty) + sizeof(uint32_t), #name" array init", lineno); \\
 518                 arr->arr_len = arr_len; \\
 519                 return arr; \\
 520         }
 521
 522 DECL_ARR_TYPE(int64_t, int64_t);
 523 DECL_ARR_TYPE(int8_t, int8_t);
 524 DECL_ARR_TYPE(uint32_t, uint32_t);
 525 DECL_ARR_TYPE(void*, ptr);
 526 DECL_ARR_TYPE(char, char);
 527 typedef charArray jstring;
 528
 529 static inline jstring str_ref_to_ts(const char* chars, size_t len) {
 530         charArray arr = init_charArray(len, __LINE__);
 531         memcpy(arr->elems, chars, len);
 532         return arr;
 533 }
 534 static inline LDKStr str_ref_to_owned_c(const jstring str) {
 535         char* newchars = MALLOC(str->arr_len + 1, "String chars");
 536         memcpy(newchars, str->elems, str->arr_len);
 537         newchars[str->arr_len] = 0;
 538         LDKStr res = {
 539                 .chars = newchars,
 540                 .len = str->arr_len,
 541                 .chars_is_owned = true
 542         };
 543         return res;
 544 }
 545
 546 typedef bool jboolean;
 547
 548 uint32_t __attribute__((export_name("TS_malloc"))) TS_malloc(uint32_t size) {
 549         return (uint32_t)MALLOC(size, "JS-Called malloc");
 550 }
 551 void __attribute__((export_name("TS_free"))) TS_free(uint32_t ptr) {
 552         FREE((void*)ptr);
 553 }
 554
 555 jstring __attribute__((export_name("TS_get_ldk_c_bindings_version"))) TS_get_ldk_c_bindings_version() {
 556         const char *res = check_get_ldk_bindings_version();
 557         if (res == NULL) return NULL;
 558         return str_ref_to_ts(res, strlen(res));
 559 }
 560 jstring __attribute__((export_name("TS_get_ldk_version"))) get_ldk_version() {
 561         const char *res = check_get_ldk_version();
 562         if (res == NULL) return NULL;
 563         return str_ref_to_ts(res, strlen(res));
 564 }
 565 #include "version.c"
 566 """
 567
 568         self.c_version_file = """jstring __attribute__((export_name("TS_get_lib_version_string"))) TS_get_lib_version_string() {
 569         return str_ref_to_ts("<git_version_ldk_garbagecollected>", strlen("<git_version_ldk_garbagecollected>"));
 570 }"""
 571
 572         self.hu_struct_file_prefix = """
 573 import CommonBase from './CommonBase.mjs';
 574 import * as bindings from '../bindings.mjs'
 575
 576 """
 577         self.util_fn_pfx = self.hu_struct_file_prefix + "\nexport class UtilMethods extends CommonBase {\n"
 578         self.util_fn_sfx = "}"
 579         self.c_fn_ty_pfx = ""
 580         self.file_ext = ".mts"
 581         self.ptr_c_ty = "uint32_t"
 582         self.ptr_native_ty = "number"
 583         self.result_c_ty = "uint32_t"
 584         self.ptr_arr = "ptrArray"
 585         self.is_arr_some_check = ("", " != 0")
 586         self.get_native_arr_len_call = ("", "->arr_len")
 587
 588     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 589         return None
 590     def create_native_arr_call(self, arr_len, ty_info):
 591         if ty_info.c_ty == "ptrArray":
 592             assert ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array")
 593         return "init_" + ty_info.c_ty + "(" + arr_len + ", __LINE__)"
 594     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 595         if ty_info.c_ty == "int8_tArray":
 596             return ("memcpy(" + arr_name + "->elems, ", ", " + arr_len + ")")
 597         else:
 598             assert False
 599     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 600         if ty_info.c_ty == "int8_tArray":
 601             if copy:
 602                 return "memcpy(" + dest_name + ", " + arr_name + "->elems, " + arr_len + "); FREE(" + arr_name + ")"
 603         if ty_info.c_ty == "ptrArray":
 604             return "(void*) " + arr_name + "->elems /* XXX " + arr_name + " leaks */"
 605         else:
 606             assert not copy
 607             return arr_name + "->elems /* XXX " + arr_name + " leaks */"
 608     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 609         assert False # Only called if above is None
 610     def get_native_arr_ptr_call(self, ty_info):
 611         if ty_info.subty is not None:
 612             return "(" + ty_info.subty.c_ty + "*)(((uint8_t*)", ") + 4)"
 613         return "(" + ty_info.c_ty + "*)(((uint8_t*)", ") + 4)"
 614     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 615         return None
 616     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 617         if ty_info.c_ty == "int8_tArray":
 618             return None
 619         else:
 620             return None
 621
 622     def map_hu_array_elems(self, arr_name, conv_name, arr_ty, elem_ty):
 623         assert elem_ty.c_ty == "uint32_t" or elem_ty.c_ty.endswith("Array")
 624         return arr_name + " != null ? " + arr_name + ".map(" + conv_name + " => " + elem_ty.from_hu_conv[0] + ") : null"
 625
 626     def str_ref_to_native_call(self, var_name, str_len):
 627         return "str_ref_to_ts(" + var_name + ", " + str_len + ")"
 628     def str_ref_to_c_call(self, var_name):
 629         return "str_ref_to_owned_c(" + var_name + ")"
 630     def str_to_hu_conv(self, var_name):
 631         return "const " + var_name + "_conv: string = bindings.decodeString(" + var_name + ");"
 632     def str_from_hu_conv(self, var_name):
 633         return ("bindings.encodeString(" + var_name + ")", "")
 634
 635     def c_fn_name_define_pfx(self, fn_name, have_args):
 636         return " __attribute__((export_name(\"TS_" + fn_name + "\"))) TS_" + fn_name + "("
 637
 638     def init_str(self):
 639         return ""
 640
 641     def get_java_arr_len(self, arr_name):
 642         return "bindings.getArrayLength(" + arr_name + ")"
 643     def get_java_arr_elem(self, elem_ty, arr_name, idx):
 644         if elem_ty.c_ty == "uint32_t" or elem_ty.c_ty == "uintptr_t" or elem_ty.c_ty.endswith("Array"):
 645             return "bindings.getU32ArrayElem(" + arr_name + ", " + idx + ")"
 646         else:
 647             assert False
 648     def constr_hu_array(self, ty_info, arr_len):
 649         return "new Array(" + arr_len + ").fill(null)"
 650     def cleanup_converted_native_array(self, ty_info, arr_name):
 651         return "bindings.freeWasmMemory(" + arr_name + ")"
 652
 653     def primitive_arr_from_hu(self, mapped_ty, fixed_len, arr_name):
 654         inner = arr_name
 655         if fixed_len is not None:
 656             assert mapped_ty.c_ty == "int8_t"
 657             inner = "bindings.check_arr_len(" + arr_name + ", " + fixed_len + ")"
 658         if mapped_ty.c_ty.endswith("Array"):
 659             return ("bindings.encodeUint32Array(" + inner + ")", "")
 660         elif mapped_ty.c_ty == "uint8_t" or mapped_ty.c_ty == "int8_t":
 661             return ("bindings.encodeUint8Array(" + inner + ")", "")
 662         elif mapped_ty.c_ty == "uint32_t":
 663             return ("bindings.encodeUint32Array(" + inner + ")", "")
 664         elif mapped_ty.c_ty == "int64_t":
 665             return ("bindings.encodeUint64Array(" + inner + ")", "")
 666         else:
 667             print(mapped_ty.c_ty)
 668             assert False
 669
 670     def primitive_arr_to_hu(self, mapped_ty, fixed_len, arr_name, conv_name):
 671         assert mapped_ty.c_ty == "uint8_t" or mapped_ty.c_ty == "int8_t"
 672         return "const " + conv_name + ": Uint8Array = bindings.decodeUint8Array(" + arr_name + ");"
 673
 674     def var_decl_statement(self, ty_string, var_name, statement):
 675         return "const " + var_name + ": " + ty_string + " = " + statement
 676
 677     def java_arr_ty_str(self, elem_ty_str):
 678         return "number"
 679
 680     def for_n_in_range(self, n, minimum, maximum):
 681         return "for (var " + n + " = " + minimum + "; " + n + " < " + maximum + "; " + n + "++) {"
 682     def for_n_in_arr(self, n, arr_name, arr_elem_ty):
 683         return (arr_name + ".forEach((" + n + ": " + arr_elem_ty.java_hu_ty + ") => { ", " })")
 684
 685     def get_ptr(self, var):
 686         return "CommonBase.get_ptr_of(" + var + ")"
 687     def set_null_skip_free(self, var):
 688         return "CommonBase.set_null_skip_free(" + var + ");"
 689
 690     def add_ref(self, holder, referent):
 691         return "CommonBase.add_ref_from(" + holder + ", " + referent + ")"
 692
 693     def obj_defined(self, struct_names, folder):
 694         with open(self.outdir + "/index.mts", 'a') as index:
 695             index.write(f"export * from './{folder}/{struct_names[0]}.mjs';\n")
 696         with open(self.outdir + "/imports.mts.part", 'a') as imports:
 697             imports.write(f"import {{ {', '.join(struct_names)} }} from '../{folder}/{struct_names[0]}.mjs';\n")
 698
 699     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 700         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_js(int32_t ord) {\n"
 701         out_c = out_c + "\tswitch (ord) {\n"
 702         ord_v = 0
 703
 704         out_typescript_enum_fields = ""
 705
 706         for var, var_docs in variants:
 707             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 708             ord_v = ord_v + 1
 709             if var_docs is not None:
 710                 var_docs_repld = var_docs.replace("\n", "\n\t")
 711                 out_typescript_enum_fields += f"/**\n\t * {var_docs_repld}\n\t */\n"
 712             out_typescript_enum_fields += f"\t{var},\n\t"
 713         out_c = out_c + "\t}\n"
 714         out_c = out_c + "\tabort();\n"
 715         out_c = out_c + "}\n"
 716
 717         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_js(LDK" + struct_name + " val) {\n"
 718         out_c = out_c + "\tswitch (val) {\n"
 719         ord_v = 0
 720         for var, _ in variants:
 721             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 722             ord_v = ord_v + 1
 723         out_c = out_c + "\t\tdefault: abort();\n"
 724         out_c = out_c + "\t}\n"
 725         out_c = out_c + "}\n"
 726
 727         out_typescript = f"""
 728 /* @internal */
 729 export enum {struct_name} {{
 730         {out_typescript_enum_fields}
 731 }}
 732 """
 733         out_typescript_enum = f"export {{ {struct_name} }} from \"../bindings.mjs\";"
 734         self.obj_defined([struct_name], "enums")
 735         return (out_c, out_typescript_enum, out_typescript)
 736
 737     def c_unitary_enum_to_native_call(self, ty_info):
 738         return (ty_info.rust_obj + "_to_js(", ")")
 739     def native_unitary_enum_to_c_call(self, ty_info):
 740         return (ty_info.rust_obj + "_from_js(", ")")
 741
 742     def native_c_map_trait(self, struct_name, field_var_conversions, flattened_field_var_conversions, field_function_lines, trait_doc_comment):
 743         out_typescript_bindings = ""
 744         super_instantiator = ""
 745         bindings_instantiator = ""
 746         pointer_to_adder = ""
 747         impl_constructor_arguments = ""
 748         for var in flattened_field_var_conversions:
 749             if isinstance(var, ConvInfo):
 750                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 751                 super_instantiator += first_to_lower(var.arg_name) + ", "
 752                 if var.from_hu_conv is not None:
 753                     bindings_instantiator += ", " + var.from_hu_conv[0]
 754                     if var.from_hu_conv[1] != "":
 755                         pointer_to_adder += "\t\t\t" + var.from_hu_conv[1] + ";\n"
 756                 else:
 757                     bindings_instantiator += ", " + first_to_lower(var.arg_name)
 758             else:
 759                 bindings_instantiator += ", " + first_to_lower(var[1]) + ".bindings_instance"
 760                 super_instantiator += first_to_lower(var[1]) + "_impl, "
 761                 pointer_to_adder += "\t\timpl_holder.held.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 762                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}Interface"
 763
 764         super_constructor_statements = ""
 765         trait_constructor_arguments = ""
 766         for var in field_var_conversions:
 767             if isinstance(var, ConvInfo):
 768                 trait_constructor_arguments += ", " + var.arg_name
 769             else:
 770                 super_constructor_statements += "\t\tconst " + first_to_lower(var[1]) + " = " + var[1] + ".new_impl(" + super_instantiator + ");\n"
 771                 trait_constructor_arguments += ", " + first_to_lower(var[1]) + ".bindings_instance"
 772                 for suparg in var[2]:
 773                     if isinstance(suparg, ConvInfo):
 774                         trait_constructor_arguments += ", " + suparg.arg_name
 775                     else:
 776                         trait_constructor_arguments += ", " + suparg[1]
 777
 778         # BUILD INTERFACE METHODS
 779         out_java_interface = ""
 780         out_interface_implementation_overrides = ""
 781         java_methods = []
 782         for fn_line in field_function_lines:
 783             java_method_descriptor = ""
 784             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 785                 out_java_interface += "\t/**" + fn_line.docs.replace("\n", "\n\t * ") + "\n\t */\n"
 786                 out_java_interface += "\t" + fn_line.fn_name + "("
 787                 out_interface_implementation_overrides += f"\t\t\t{fn_line.fn_name} ("
 788
 789                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 790                     if idx >= 1:
 791                         out_java_interface += ", "
 792                         out_interface_implementation_overrides += ", "
 793                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 794                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 795                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 796                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n"
 797                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 798                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 799
 800                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 801
 802                 for arg_info in fn_line.args_ty:
 803                     if arg_info.to_hu_conv is not None:
 804                         out_interface_implementation_overrides += "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 805
 806                 if fn_line.ret_ty_info.java_ty != "void":
 807                     out_interface_implementation_overrides += "\t\t\t\tconst ret: " + fn_line.ret_ty_info.java_hu_ty + " = arg." + fn_line.fn_name + "("
 808                 else:
 809                     out_interface_implementation_overrides += f"\t\t\t\targ." + fn_line.fn_name + "("
 810
 811                 for idx, arg_info in enumerate(fn_line.args_ty):
 812                     if idx != 0:
 813                         out_interface_implementation_overrides += ", "
 814                     if arg_info.to_hu_conv_name is not None:
 815                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 816                     else:
 817                         out_interface_implementation_overrides += arg_info.arg_name
 818
 819                 out_interface_implementation_overrides += ");\n"
 820                 if fn_line.ret_ty_info.java_ty != "void":
 821                     if fn_line.ret_ty_info.from_hu_conv is not None:
 822                         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"
 823                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 824                             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"
 825                         #if fn_line.ret_ty_info.rust_obj in result_types:
 826                         # XXX: We need to handle this in conversion logic so that its cross-language!
 827                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 828                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 829                         out_interface_implementation_overrides += "\t\t\t\treturn result;\n"
 830                     else:
 831                         out_interface_implementation_overrides += "\t\t\t\treturn ret;\n"
 832                 out_interface_implementation_overrides += f"\t\t\t}},\n"
 833
 834         formatted_trait_docs = trait_doc_comment.replace("\n", "\n * ")
 835         out_typescript_human = f"""
 836 {self.hu_struct_file_prefix}
 837
 838 /** An implementation of {struct_name.replace("LDK","")} */
 839 export interface {struct_name.replace("LDK", "")}Interface {{
 840 {out_java_interface}}}
 841
 842 class {struct_name}Holder {{
 843         held: {struct_name.replace("LDK", "")};
 844 }}
 845
 846 /**
 847  * {formatted_trait_docs}
 848  */
 849 export class {struct_name.replace("LDK","")} extends CommonBase {{
 850         /* @internal */
 851         public bindings_instance?: bindings.{struct_name};
 852
 853         /* @internal */
 854         constructor(_dummy: object, ptr: number) {{
 855                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
 856                 this.bindings_instance = null;
 857         }}
 858
 859         /** Creates a new instance of {struct_name.replace("LDK","")} from a given implementation */
 860         public static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 861                 const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 862                 let structImplementation = {{
 863 {out_interface_implementation_overrides}                }} as bindings.{struct_name};
 864 {super_constructor_statements}          const ptr: number = bindings.{struct_name}_new(structImplementation{bindings_instantiator});
 865
 866                 impl_holder.held = new {struct_name.replace("LDK", "")}(null, ptr);
 867                 impl_holder.held.bindings_instance = structImplementation;
 868 {pointer_to_adder}              return impl_holder.held;
 869         }}
 870
 871 """
 872         self.obj_defined([struct_name.replace("LDK", ""), struct_name.replace("LDK", "") + "Interface"], "structs")
 873
 874         out_typescript_bindings += "/* @internal */\nexport interface " + struct_name + " {\n"
 875         java_meths = []
 876         for fn_line in field_function_lines:
 877             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 878                 out_typescript_bindings += f"\t{fn_line.fn_name} ("
 879
 880                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 881                     if idx >= 1:
 882                         out_typescript_bindings = out_typescript_bindings + ", "
 883                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 884
 885                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 886
 887         out_typescript_bindings += "}\n\n"
 888
 889         out_typescript_bindings += f"/* @internal */\nexport function {struct_name}_new(impl: {struct_name}"
 890         for var in flattened_field_var_conversions:
 891             if isinstance(var, ConvInfo):
 892                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 893             else:
 894                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 895
 896         out_typescript_bindings += f"""): number {{
 897         if(!isWasmInitialized) {{
 898                 throw new Error("initializeWasm() must be awaited first!");
 899         }}
 900         var new_obj_idx = js_objs.length;
 901         for (var i = 0; i < js_objs.length; i++) {{
 902                 if (js_objs[i] == null || js_objs[i] == undefined) {{ new_obj_idx = i; break; }}
 903         }}
 904         js_objs[i] = new WeakRef(impl);
 905         return wasm.TS_{struct_name}_new(i);
 906 }}
 907 """
 908
 909         # Now that we've written out our java code (and created java_meths), generate C
 910         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 911         out_c += "\tatomic_size_t refcnt;\n"
 912         out_c += "\tuint32_t instance_ptr;\n"
 913         for var in flattened_field_var_conversions:
 914             if isinstance(var, ConvInfo):
 915                 # We're a regular ol' field
 916                 pass
 917             else:
 918                 # We're a supertrait
 919                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 920         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 921
 922         for fn_line in field_function_lines:
 923             if fn_line.fn_name == "free":
 924                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 925                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 926                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 927                 out_c = out_c + "\t\tFREE(j_calls);\n"
 928                 out_c = out_c + "\t}\n}\n"
 929
 930         for idx, fn_line in enumerate(field_function_lines):
 931             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 932                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 933                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 934                 if fn_line.self_is_const:
 935                     out_c = out_c + "const void* this_arg"
 936                 else:
 937                     out_c = out_c + "void* this_arg"
 938
 939                 for idx, arg in enumerate(fn_line.args_ty):
 940                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 941
 942                 out_c = out_c + ") {\n"
 943                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 944
 945                 for arg_info in fn_line.args_ty:
 946                     if arg_info.ret_conv is not None:
 947                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 948                         out_c = out_c + arg_info.arg_name
 949                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 950
 951                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 952                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (" + fn_line.ret_ty_info.c_ty + ")"
 953                     out_c += "js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 954                 elif fn_line.ret_ty_info.java_ty == "void":
 955                     out_c = out_c + "\tjs_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 956                 elif fn_line.ret_ty_info.java_hu_ty == "string":
 957                     out_c = out_c + "\tjstring ret = (jstring)js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 958                 elif not fn_line.ret_ty_info.passed_as_ptr:
 959                     out_c = out_c + "\treturn js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 960                 else:
 961                     out_c = out_c + "\tuint32_t ret = js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 962
 963                 self.function_ptrs[self.function_ptr_counter] = (struct_name, fn_line.fn_name)
 964                 self.function_ptr_counter += 1
 965
 966                 for idx, arg_info in enumerate(fn_line.args_ty):
 967                     if arg_info.ret_conv is not None:
 968                         out_c = out_c + ", (uint32_t)" + arg_info.ret_conv_name
 969                     else:
 970                         out_c = out_c + ", (uint32_t)" + arg_info.arg_name
 971                 out_c = out_c + ");\n"
 972                 if fn_line.ret_ty_info.arg_conv is not None:
 973                     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"
 974
 975                 out_c = out_c + "}\n"
 976
 977         # Write out a clone function whether we need one or not, as we use them in moving to rust
 978         out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
 979         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
 980         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 981         for var in field_var_conversions:
 982             if not isinstance(var, ConvInfo):
 983                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 984         out_c = out_c + "}\n"
 985
 986         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (JSValue o"
 987         for var in flattened_field_var_conversions:
 988             if isinstance(var, ConvInfo):
 989                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 990             else:
 991                 out_c = out_c + ", JSValue " + var[1]
 992         out_c = out_c + ") {\n"
 993
 994         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 995         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 996         out_c = out_c + "\tcalls->instance_ptr = o;\n"
 997
 998         for (fn_name, java_meth_descr) in java_meths:
 999             if fn_name != "free" and fn_name != "cloned":
1000                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
1001                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
1002
1003         for var in flattened_field_var_conversions:
1004             if isinstance(var, ConvInfo) and var.arg_conv is not None:
1005                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
1006         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
1007         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
1008         for fn_line in field_function_lines:
1009             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
1010                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
1011             elif fn_line.fn_name == "free":
1012                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
1013             else:
1014                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
1015         for var in field_var_conversions:
1016             if isinstance(var, ConvInfo):
1017                 if var.arg_conv_name is not None:
1018                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
1019                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
1020                 else:
1021                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
1022                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
1023             else:
1024                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(" + var[1]
1025                 for suparg in var[2]:
1026                     if isinstance(suparg, ConvInfo):
1027                         out_c += ", " + suparg.arg_name
1028                     else:
1029                         out_c += ", " + suparg[1]
1030                 out_c += "),\n"
1031         out_c = out_c + "\t};\n"
1032         for var in flattened_field_var_conversions:
1033             if not isinstance(var, ConvInfo):
1034                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
1035         out_c = out_c + "\treturn ret;\n"
1036         out_c = out_c + "}\n"
1037
1038         out_c = out_c + self.c_fn_ty_pfx + "long " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "JSValue o"
1039         for var in flattened_field_var_conversions:
1040             if isinstance(var, ConvInfo):
1041                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
1042             else:
1043                 out_c = out_c + ", JSValue " + var[1]
1044         out_c = out_c + ") {\n"
1045         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
1046         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(o"
1047         for var in flattened_field_var_conversions:
1048             if isinstance(var, ConvInfo):
1049                 out_c = out_c + ", " + var.arg_name
1050             else:
1051                 out_c = out_c + ", " + var[1]
1052         out_c = out_c + ");\n"
1053         out_c = out_c + "\treturn (long)res_ptr;\n"
1054         out_c = out_c + "}\n"
1055
1056         return (out_typescript_bindings, out_typescript_human, out_c)
1057
1058     def trait_struct_inc_refcnt(self, ty_info):
1059         return ""
1060
1061     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
1062         bindings_type = struct_name.replace("LDK", "")
1063         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
1064
1065         out_java_enum = ""
1066         out_java = ""
1067         out_c = ""
1068
1069         out_java_enum += (self.hu_struct_file_prefix)
1070
1071         java_hu_class = "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
1072         java_hu_class += "export class " + java_hu_type + " extends CommonBase {\n"
1073         java_hu_class += "\tprotected constructor(_dummy: object, ptr: number) { super(ptr, bindings." + bindings_type + "_free); }\n"
1074         java_hu_class += "\t/* @internal */\n"
1075         java_hu_class += f"\tpublic static constr_from_ptr(ptr: number): {java_hu_type} {{\n"
1076         java_hu_class += f"\t\tconst raw_ty: number = bindings." + struct_name + "_ty_from_ptr(ptr);\n"
1077         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"
1078         out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n"
1079         out_c += "\tswitch(obj->tag) {\n"
1080         java_hu_class += "\t\tswitch (raw_ty) {\n"
1081         java_hu_subclasses = ""
1082
1083         out_java += "/* @internal */\nexport class " + struct_name + " {\n"
1084         out_java += "\tprotected constructor() {}\n"
1085         var_idx = 0
1086         for var in variant_list:
1087             java_hu_subclasses += "/** A " + java_hu_type + " of type " + var.var_name + " */\n"
1088             java_hu_subclasses += "export class " + java_hu_type + "_" + var.var_name + " extends " + java_hu_type + " {\n"
1089             java_hu_class += f"\t\t\tcase {var_idx}: "
1090             java_hu_class += "return new " + java_hu_type + "_" + var.var_name + "(ptr);\n"
1091             out_c += f"\t\tcase {struct_name}_{var.var_name}: return {var_idx};\n"
1092             hu_conv_body = ""
1093             for idx, (field_ty, field_docs) in enumerate(var.fields):
1094                 if field_docs is not None:
1095                     java_hu_subclasses += "\t/**\n\t * " + field_docs.replace("\n", "\n\t * ") + "\n\t */\n"
1096                 java_hu_subclasses += "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
1097                 if field_ty.to_hu_conv is not None:
1098                     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"
1099                     hu_conv_body += f"\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1100                     hu_conv_body += f"\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1101                 else:
1102                     hu_conv_body += f"\t\tthis.{field_ty.arg_name} = bindings.{struct_name}_{var.var_name}_get_{field_ty.arg_name}(ptr);\n"
1103             java_hu_subclasses += "\t/* @internal */\n"
1104             java_hu_subclasses += "\tpublic constructor(ptr: number) {\n\t\tsuper(null, ptr);\n"
1105             java_hu_subclasses = java_hu_subclasses + hu_conv_body
1106             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
1107             var_idx += 1
1108         out_java += "}\n"
1109         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"
1110         out_java += self.fn_call_body(struct_name + "_ty_from_ptr", "uint32_t", "number", "ptr: number", "ptr")
1111         out_c += ("\t\tdefault: abort();\n")
1112         out_c += ("\t}\n}\n")
1113
1114         for var in variant_list:
1115             for idx, (field_map, _) in enumerate(var.fields):
1116                 fn_name = f"{struct_name}_{var.var_name}_get_{field_map.arg_name}"
1117                 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"
1118                 out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n"
1119                 out_c += f"\tassert(obj->tag == {struct_name}_{var.var_name});\n"
1120                 if field_map.ret_conv is not None:
1121                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1122                     if var.tuple_variant:
1123                         out_c += "obj->" + camel_to_snake(var.var_name)
1124                     else:
1125                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
1126                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1127                     out_c += "\treturn " + field_map.ret_conv_name + ";\n"
1128                 else:
1129                     if var.tuple_variant:
1130                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + ";\n"
1131                     else:
1132                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name + ";\n"
1133                 out_c += "}\n"
1134                 out_java += self.fn_call_body(fn_name, field_map.c_ty, field_map.java_ty, "ptr: number", "ptr")
1135         out_java_enum += java_hu_class
1136         self.struct_file_suffixes[java_hu_type] = java_hu_subclasses
1137         self.obj_defined([java_hu_type], "structs")
1138         return (out_java, out_java_enum, out_c)
1139
1140     def map_opaque_struct(self, struct_name, struct_doc_comment):
1141         implementations = ""
1142         method_header = ""
1143
1144         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
1145         out_opaque_struct_human = f"{self.hu_struct_file_prefix}"
1146         if struct_name.startswith("LDKLocked"):
1147             out_opaque_struct_human += "/** XXX: DO NOT USE THIS - it remains locked until the GC runs (if that ever happens */"
1148         formatted_doc_comment = struct_doc_comment.replace("\n", "\n * ")
1149         out_opaque_struct_human += f"""
1150 /**
1151  * {formatted_doc_comment}
1152  */
1153 export class {hu_name} extends CommonBase {implementations}{{
1154         /* @internal */
1155         public constructor(_dummy: object, ptr: number) {{
1156                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1157         }}
1158
1159 """
1160         self.obj_defined([hu_name], "structs")
1161         return out_opaque_struct_human
1162
1163     def map_tuple(self, struct_name):
1164         return self.map_opaque_struct(struct_name, "A Tuple")
1165
1166     def map_result(self, struct_name, res_map, err_map):
1167         human_ty = struct_name.replace("LDKCResult", "Result")
1168
1169         suffixes = f"export class {human_ty}_OK extends {human_ty} {{\n"
1170         if res_map.java_hu_ty != "void":
1171             suffixes += "\tpublic res: " + res_map.java_hu_ty + ";\n"
1172         suffixes += f"""
1173         /* @internal */
1174         public constructor(_dummy: object, ptr: number) {{
1175                 super(_dummy, ptr);
1176 """
1177         if res_map.java_hu_ty == "void":
1178             pass
1179         elif res_map.to_hu_conv is not None:
1180             suffixes += "\t\tconst res: " + res_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1181             suffixes += "\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t")
1182             suffixes += "\n\t\tthis.res = " + res_map.to_hu_conv_name + ";\n"
1183         else:
1184             suffixes += "\t\tthis.res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1185         suffixes += "\t}\n}\n"
1186
1187         suffixes += f"export class {human_ty}_Err extends {human_ty} {{\n"
1188         if err_map.java_hu_ty != "void":
1189             suffixes += "\tpublic err: " + err_map.java_hu_ty + ";\n"
1190         suffixes += f"""
1191         /* @internal */
1192         public constructor(_dummy: object, ptr: number) {{
1193                 super(_dummy, ptr);
1194 """
1195         if err_map.java_hu_ty == "void":
1196             pass
1197         elif err_map.to_hu_conv is not None:
1198             suffixes += "\t\tconst err: " + err_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1199             suffixes += "\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t")
1200             suffixes += "\n\t\tthis.err = " + err_map.to_hu_conv_name + ";\n"
1201         else:
1202             suffixes += "\t\tthis.err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1203         suffixes += "\t}\n}"
1204
1205         self.struct_file_suffixes[human_ty] = suffixes
1206         self.obj_defined([human_ty], "structs")
1207
1208         return f"""{self.hu_struct_file_prefix}
1209
1210 export class {human_ty} extends CommonBase {{
1211         protected constructor(_dummy: object, ptr: number) {{
1212                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1213         }}
1214         /* @internal */
1215         public static constr_from_ptr(ptr: number): {human_ty} {{
1216                 if (bindings.{struct_name.replace("LDK", "")}_is_ok(ptr)) {{
1217                         return new {human_ty}_OK(null, ptr);
1218                 }} else {{
1219                         return new {human_ty}_Err(null, ptr);
1220                 }}
1221         }}
1222 """
1223
1224     def fn_call_body(self, method_name, return_c_ty, return_java_ty, method_argument_string, native_call_argument_string):
1225         has_return_value = return_c_ty != 'void'
1226         return_statement = 'return nativeResponseValue;'
1227         if not has_return_value:
1228             return_statement = '// debug statements here'
1229
1230         return f"""/* @internal */
1231 export function {method_name}({method_argument_string}): {return_java_ty} {{
1232         if(!isWasmInitialized) {{
1233                 throw new Error("initializeWasm() must be awaited first!");
1234         }}
1235         const nativeResponseValue = wasm.TS_{method_name}({native_call_argument_string});
1236         {return_statement}
1237 }}
1238 """
1239     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):
1240         out_java = ""
1241         out_c = ""
1242         out_java_struct = None
1243
1244         out_java += ("\t")
1245         out_c += (self.c_fn_ty_pfx)
1246         out_c += (return_type_info.c_ty)
1247         out_java += (return_type_info.java_ty)
1248         if return_type_info.ret_conv is not None:
1249             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1250         out_java += (" " + method_name + "(")
1251         out_c += (" "  + self.c_fn_name_define_pfx(method_name, True))
1252
1253         method_argument_string = ""
1254         native_call_argument_string = ""
1255         for idx, arg_conv_info in enumerate(argument_types):
1256             if idx != 0:
1257                 method_argument_string += (", ")
1258                 native_call_argument_string += ', '
1259                 out_c += (", ")
1260             if arg_conv_info.c_ty != "void":
1261                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1262                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
1263                 native_call_argument_string += arg_conv_info.arg_name
1264         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)
1265
1266         out_java_struct = ""
1267         if doc_comment is not None:
1268             out_java_struct = "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
1269
1270         if not args_known:
1271             out_java_struct += ("\t// Skipped " + method_name + "\n")
1272         else:
1273             if not takes_self:
1274                 out_java_struct += (
1275                         "\tpublic static constructor_" + meth_n + "(")
1276             else:
1277                 out_java_struct += ("\tpublic " + meth_n + "(")
1278             for idx, arg in enumerate(argument_types):
1279                 if idx != 0:
1280                     if not takes_self or idx > 1:
1281                         out_java_struct += (", ")
1282                 elif takes_self:
1283                     continue
1284                 if arg.java_ty != "void":
1285                     if arg.arg_name in default_constructor_args:
1286                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1287                             if explode_idx != 0:
1288                                 out_java_struct += (", ")
1289                             out_java_struct += arg.arg_name + "_" + explode_arg.arg_name + ": " + explode_arg.java_hu_ty
1290                     else:
1291                         out_java_struct += arg.arg_name + ": " + arg.java_hu_ty
1292
1293         out_c += (") {\n")
1294         if out_java_struct is not None:
1295             out_java_struct += "): " + return_type_info.java_hu_ty + " {\n"
1296         for info in argument_types:
1297             if info.arg_conv is not None:
1298                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1299         if return_type_info.ret_conv is not None:
1300             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1301         elif return_type_info.c_ty != "void":
1302             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1303         else:
1304             out_c += ("\t")
1305         if c_call_string is None:
1306             out_c += (method_name + "(")
1307         else:
1308             out_c += (c_call_string)
1309         for idx, info in enumerate(argument_types):
1310             if info.arg_conv_name is not None:
1311                 if idx != 0:
1312                     out_c += (", ")
1313                 elif c_call_string is not None:
1314                     continue
1315                 out_c += (info.arg_conv_name)
1316         out_c += (")")
1317         if return_type_info.ret_conv is not None:
1318             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1319         else:
1320             out_c += (";")
1321         for info in argument_types:
1322             if info.arg_conv_cleanup is not None:
1323                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1324         if return_type_info.ret_conv is not None:
1325             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1326         elif return_type_info.c_ty != "void":
1327             out_c += ("\n\treturn ret_val;")
1328         out_c += ("\n}\n\n")
1329
1330         if args_known:
1331             out_java_struct += ("\t\t")
1332             if return_type_info.java_ty != "void":
1333                 out_java_struct += "const ret: " + return_type_info.java_ty + " = "
1334             out_java_struct += ("bindings." + method_name + "(")
1335             for idx, info in enumerate(argument_types):
1336                 if idx != 0:
1337                     out_java_struct += (", ")
1338                 if idx == 0 and takes_self:
1339                     out_java_struct += ("this.ptr")
1340                 elif info.arg_name in default_constructor_args:
1341                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1342                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1343                         if explode_idx != 0:
1344                             out_java_struct += (", ")
1345                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1346                         if explode_arg.from_hu_conv is not None:
1347                             out_java_struct += (
1348                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1349                         else:
1350                             out_java_struct += (expl_arg_name)
1351                     out_java_struct += (")")
1352                 elif info.from_hu_conv is not None:
1353                     out_java_struct += (info.from_hu_conv[0])
1354                 else:
1355                     out_java_struct += (info.arg_name)
1356             out_java_struct += (");\n")
1357             if return_type_info.to_hu_conv is not None:
1358                 if not takes_self:
1359                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1360                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1361                 else:
1362                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1363
1364             for idx, info in enumerate(argument_types):
1365                 if idx == 0 and takes_self:
1366                     pass
1367                 elif info.arg_name in default_constructor_args:
1368                     for explode_arg in default_constructor_args[info.arg_name]:
1369                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1370                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1371                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1372                                                                                              expl_arg_name).replace(
1373                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1374                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1375                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1376                         out_java_struct += (
1377                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1378                     else:
1379                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1380
1381             if return_type_info.to_hu_conv_name is not None:
1382                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1383             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1384                 out_java_struct += ("\t\treturn ret;\n")
1385             out_java_struct += ("\t}\n\n")
1386
1387         return (out_java, out_c, out_java_struct)
1388
1389     def cleanup(self):
1390         for struct in self.struct_file_suffixes:
1391             with open(self.outdir + "/structs/" + struct + self.file_ext, "a") as src:
1392                 src.write(self.struct_file_suffixes[struct])
1393
1394         with open(self.outdir + "/bindings.mts", "a") as bindings:
1395             bindings.write("""
1396
1397 js_invoke = function(obj_ptr: number, fn_id: number, arg1: number, arg2: number, arg3: number, arg4: number, arg5: number, arg6: number, arg7: number, arg8: number, arg9: number, arg10: number) {
1398         const weak: WeakRef<object> = js_objs[obj_ptr];
1399         if (weak == null || weak == undefined) {
1400                 console.error("Got function call on unknown/free'd JS object!");
1401                 throw new Error("Got function call on unknown/free'd JS object!");
1402         }
1403         const obj: object = weak.deref();
1404         if (obj == null || obj == undefined) {
1405                 console.error("Got function call on GC'd JS object!");
1406                 throw new Error("Got function call on GC'd JS object!");
1407         }
1408         var fn;
1409 """)
1410             bindings.write("\tswitch (fn_id) {\n")
1411             for f in self.function_ptrs:
1412                 bindings.write(f"\t\tcase {str(f)}: fn = Object.getOwnPropertyDescriptor(obj, \"{self.function_ptrs[f][1]}\"); break;\n")
1413
1414             bindings.write("""\t\tdefault:
1415                         console.error("Got unknown function call from C!");
1416                         throw new Error("Got unknown function call from C!");
1417         }
1418         if (fn == null || fn == undefined) {
1419                 console.error("Got function call on incorrect JS object!");
1420                 throw new Error("Got function call on incorrect JS object!");
1421         }
1422         return fn.value.bind(obj)(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10);
1423 }""")