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