_ 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 import { UInt5, WitnessVersion } from './structs/CommonBase.mjs';
  40
  41 const imports: any = {};
  42 imports.env = {};
  43
  44 var js_objs: Array<WeakRef<object>> = [];
  45 var js_invoke: Function;
  46 var getRandomValues: Function;
  47
  48 imports.wasi_snapshot_preview1 = {
  49         "fd_write": (fd: number, iovec_array_ptr: number, iovec_array_len: number) => {
  50                 // This should generally only be used to print panic messages
  51                 console.log("FD_WRITE to " + fd + " in " + iovec_array_len + " chunks.");
  52                 const ptr_len_view = new Uint32Array(wasm.memory.buffer, iovec_array_ptr, iovec_array_len * 2);
  53                 for (var i = 0; i < iovec_array_len; i++) {
  54                         const bytes_view = new Uint8Array(wasm.memory.buffer, ptr_len_view[i*2], ptr_len_view[i*2+1]);
  55                         console.log(String.fromCharCode(...bytes_view));
  56                 }
  57                 return 0;
  58         },
  59         "fd_close": (_fd: number) => {
  60                 // This is not generally called, but may be referenced in debug builds
  61                 console.log("wasi_snapshot_preview1:fd_close");
  62                 return 58; // Not Supported
  63         },
  64         "fd_seek": (_fd: number, _offset: bigint, _whence: number, _new_offset: number) => {
  65                 // This is not generally called, but may be referenced in debug builds
  66                 console.log("wasi_snapshot_preview1:fd_seek");
  67                 return 58; // Not Supported
  68         },
  69         "random_get": (buf_ptr: number, buf_len: number) => {
  70                 const buf = new Uint8Array(wasm.memory.buffer, buf_ptr, buf_len);
  71                 getRandomValues(buf);
  72                 return 0;
  73         },
  74         "environ_sizes_get": (environ_var_count_ptr: number, environ_len_ptr: number) => {
  75                 // This is called before fd_write to format + print panic messages
  76                 console.log("wasi_snapshot_preview1:environ_sizes_get");
  77                 const out_count_view = new Uint32Array(wasm.memory.buffer, environ_var_count_ptr, 1);
  78                 out_count_view[0] = 0;
  79                 const out_len_view = new Uint32Array(wasm.memory.buffer, environ_len_ptr, 1);
  80                 out_len_view[0] = 0;
  81                 return 0;
  82         },
  83         "environ_get": (environ_ptr: number, environ_buf_ptr: number) => {
  84                 // This is called before fd_write to format + print panic messages
  85                 console.log("wasi_snapshot_preview1:environ_get");
  86                 return 58; // Note supported - we said there were 0 environment entries!
  87         },
  88         "proc_exit" : () => {
  89                 console.log("wasi_snapshot_preview1:proc_exit");
  90         },
  91 };
  92
  93 var wasm: any = null;
  94 let isWasmInitialized: boolean = false;
  95
  96 async function finishInitializeWasm(wasmInstance: WebAssembly.Instance) {
  97         if (typeof crypto === "undefined") {
  98                 var crypto_import = (await import('crypto')).webcrypto;
  99                 getRandomValues = crypto_import.getRandomValues.bind(crypto_import);
 100         } else {
 101                 getRandomValues = crypto.getRandomValues.bind(crypto);
 102         }
 103
 104         wasm = wasmInstance.exports;
 105         if (!wasm.test_bigint_pass_deadbeef0badf00d(BigInt("0xdeadbeef0badf00d"))) {
 106                 throw new Error(\"Currently need BigInt-as-u64 support, try ----experimental-wasm-bigint");
 107         }
 108
 109         if (decodeString(wasm.TS_get_lib_version_string()) !== version.get_ldk_java_bindings_version())
 110                 throw new Error(\"Compiled LDK library and LDK class failes do not match\");
 111         // Fetching the LDK versions from C also checks that the header and binaries match
 112         const c_bindings_ver: number = wasm.TS_get_ldk_c_bindings_version();
 113         const ldk_ver: number = wasm.TS_get_ldk_version();
 114         if (c_bindings_ver == 0)
 115                 throw new Error(\"LDK version did not match the header we built against\");
 116         if (ldk_ver == 0)
 117                 throw new Error(\"LDK C bindings version did not match the header we built against\");
 118         const c_bindings_version: string = decodeString(c_bindings_ver)
 119         const ldk_version: string = decodeString(ldk_ver);
 120         console.log(\"Loaded LDK-Java Bindings with LDK \" + ldk_version + \" and LDK-C-Bindings \" + c_bindings_version);
 121
 122         isWasmInitialized = true;
 123 }
 124
 125 /* @internal */
 126 export async function initializeWasmFromUint8Array(wasmBinary: Uint8Array) {
 127         imports.env["js_invoke_function"] = js_invoke;
 128         const { instance: wasmInstance } = await WebAssembly.instantiate(wasmBinary, imports);
 129         await finishInitializeWasm(wasmInstance);
 130 }
 131
 132 /* @internal */
 133 export async function initializeWasmFetch(uri: string) {
 134         const stream = fetch(uri);
 135         imports.env["js_invoke_function"] = js_invoke;
 136         const { instance: wasmInstance } = await WebAssembly.instantiateStreaming(stream, imports);
 137         await finishInitializeWasm(wasmInstance);
 138 }"""
 139
 140         self.bindings_header += """
 141 // WASM CODEC
 142
 143 /* @internal */
 144 export function uint5ArrToBytes(inputArray: Array<UInt5>): Uint8Array {
 145         const arr = new Uint8Array(inputArray.length);
 146         for (var i = 0; i < inputArray.length; i++) {
 147                 arr[i] = inputArray[i].getVal();
 148         }
 149         return arr;
 150 }
 151
 152 /* @internal */
 153 export function WitnessVersionArrToBytes(inputArray: Array<WitnessVersion>): Uint8Array {
 154         const arr = new Uint8Array(inputArray.length);
 155         for (var i = 0; i < inputArray.length; i++) {
 156                 arr[i] = inputArray[i].getVal();
 157         }
 158         return arr;
 159 }
 160
 161
 162
 163 /* @internal */
 164 export function encodeUint8Array (inputArray: Uint8Array): number {
 165         const cArrayPointer = wasm.TS_malloc(inputArray.length + 4);
 166         const arrayLengthView = new Uint32Array(wasm.memory.buffer, cArrayPointer, 1);
 167         arrayLengthView[0] = inputArray.length;
 168         const arrayMemoryView = new Uint8Array(wasm.memory.buffer, cArrayPointer + 4, inputArray.length);
 169         arrayMemoryView.set(inputArray);
 170         return cArrayPointer;
 171 }
 172 /* @internal */
 173 export function encodeUint32Array (inputArray: Uint32Array|Array<number>): number {
 174         const cArrayPointer = wasm.TS_malloc((inputArray.length + 1) * 4);
 175         const arrayMemoryView = new Uint32Array(wasm.memory.buffer, cArrayPointer, inputArray.length);
 176         arrayMemoryView.set(inputArray, 1);
 177         arrayMemoryView[0] = inputArray.length;
 178         return cArrayPointer;
 179 }
 180 /* @internal */
 181 export function encodeUint64Array (inputArray: BigUint64Array|Array<bigint>): number {
 182         const cArrayPointer = wasm.TS_malloc(inputArray.length * 8 + 1);
 183         const arrayLengthView = new Uint32Array(wasm.memory.buffer, cArrayPointer, 1);
 184         arrayLengthView[0] = inputArray.length;
 185         const arrayMemoryView = new BigUint64Array(wasm.memory.buffer, cArrayPointer + 4, inputArray.length);
 186         arrayMemoryView.set(inputArray);
 187         return cArrayPointer;
 188 }
 189
 190 /* @internal */
 191 export function check_arr_len(arr: Uint8Array, len: number): Uint8Array {
 192         if (arr.length != len) { throw new Error("Expected array of length " + len + "got " + arr.length); }
 193         return arr;
 194 }
 195
 196 /* @internal */
 197 export function getArrayLength(arrayPointer: number): number {
 198         const arraySizeViewer = new Uint32Array(wasm.memory.buffer, arrayPointer, 1);
 199         return arraySizeViewer[0];
 200 }
 201 /* @internal */
 202 export function decodeUint8Array (arrayPointer: number, free = true): Uint8Array {
 203         const arraySize = getArrayLength(arrayPointer);
 204         const actualArrayViewer = new Uint8Array(wasm.memory.buffer, arrayPointer + 4, arraySize);
 205         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 206         // will free the underlying memory when it becomes unreachable instead of copying here.
 207         // Note that doing so may have edge-case interactions with memory resizing (invalidating the buffer).
 208         const actualArray = actualArrayViewer.slice(0, arraySize);
 209         if (free) {
 210                 wasm.TS_free(arrayPointer);
 211         }
 212         return actualArray;
 213 }
 214 const decodeUint32Array = (arrayPointer: number, free = true) => {
 215         const arraySize = getArrayLength(arrayPointer);
 216         const actualArrayViewer = new Uint32Array(
 217                 wasm.memory.buffer, // value
 218                 arrayPointer + 4, // offset (ignoring length bytes)
 219                 arraySize // uint32 count
 220         );
 221         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 222         // will free the underlying memory when it becomes unreachable instead of copying here.
 223         const actualArray = actualArrayViewer.slice(0, arraySize);
 224         if (free) {
 225                 wasm.TS_free(arrayPointer);
 226         }
 227         return actualArray;
 228 }
 229
 230
 231 export function freeWasmMemory(pointer: number) { wasm.TS_free(pointer); }
 232
 233 /* @internal */
 234 export function getU32ArrayElem(arrayPointer: number, idx: number): number {
 235         const actualArrayViewer = new Uint32Array(wasm.memory.buffer, arrayPointer + 4, idx + 1);
 236         return actualArrayViewer[idx];
 237 }
 238
 239 /* @internal */
 240 export function getU8ArrayElem(arrayPointer: number, idx: number): number {
 241         const actualArrayViewer = new Uint8Array(wasm.memory.buffer, arrayPointer + 4, idx + 1);
 242         return actualArrayViewer[idx];
 243 }
 244
 245
 246 /* @internal */
 247 export function encodeString(str: string): number {
 248         const charArray = new TextEncoder().encode(str);
 249         return encodeUint8Array(charArray);
 250 }
 251
 252 /* @internal */
 253 export function decodeString(stringPointer: number, free = true): string {
 254         const arraySize = getArrayLength(stringPointer);
 255         const memoryView = new Uint8Array(wasm.memory.buffer, stringPointer + 4, arraySize);
 256         const result = new TextDecoder("utf-8").decode(memoryView);
 257
 258         if (free) {
 259                 wasm.TS_free(stringPointer);
 260         }
 261
 262         return result;
 263 }
 264 """
 265         if DEBUG:
 266             self.bindings_header += """
 267 /* @internal */
 268 export function getRemainingAllocationCount(): number {
 269         return wasm.TS_allocs_remaining();
 270 }
 271 /* @internal */
 272 export function debugPrintRemainingAllocs() {
 273         wasm.TS_print_leaks();
 274 }
 275 """
 276         else:
 277             self.bindings_header += "\n/* @internal */ export function getRemainingAllocationCount(): number { return 0; }\n"
 278             self.bindings_header += "/* @internal */ export function debugPrintRemainingAllocs() { }\n"
 279
 280         with open(outdir + "/index.mts", 'a') as index:
 281             index.write("""import { initializeWasmFetch, initializeWasmFromUint8Array } from './bindings.mjs';
 282 /** Initializes the WASM backend by calling `fetch()` on the given URI - Browser only */
 283 export async function initializeWasmWebFetch(uri: string) {
 284         await initializeWasmFetch(uri);
 285 }
 286 /** Initializes the WASM backend given a Uint8Array of the .wasm binary file - Browser or Node.JS */
 287 export async function initializeWasmFromBinary(bin: Uint8Array) {
 288         await initializeWasmFromUint8Array(bin);
 289 }
 290
 291 """)
 292
 293         self.bindings_version_file = """export function get_ldk_java_bindings_version(): String {
 294         return "<git_version_ldk_garbagecollected>";
 295 }"""
 296
 297         self.bindings_footer = ""
 298
 299         self.common_base = """
 300 function freer(f: () => void) { f() }
 301 const finalizer = new FinalizationRegistry(freer);
 302 function get_freeer(ptr: number, free_fn: (ptr: number) => void) {
 303         return () => {
 304                 free_fn(ptr);
 305         }
 306 }
 307
 308 export class CommonBase {
 309         protected ptr: number;
 310         protected ptrs_to: object[] = [];
 311         protected constructor(ptr: number, free_fn: (ptr: number) => void) {
 312                 this.ptr = ptr;
 313                 if (Number.isFinite(ptr) && ptr != 0){
 314                         finalizer.register(this, get_freeer(ptr, free_fn));
 315                 }
 316         }
 317         // In Java, protected means "any subclass can access fields on any other subclass'"
 318         // In TypeScript, protected means "any subclass can access parent fields on instances of itself"
 319         // To work around this, we add accessors for other instances' protected fields here.
 320         protected static add_ref_from(holder: CommonBase, referent: object) {
 321                 holder.ptrs_to.push(referent);
 322         }
 323         protected static get_ptr_of(o: CommonBase) {
 324                 return o.ptr;
 325         }
 326         protected static set_null_skip_free(o: CommonBase) {
 327                 o.ptr = 0;
 328                 finalizer.unregister(o);
 329         }
 330 }
 331
 332 export class UInt5 {
 333         public constructor(private val: number) {
 334                 if (val > 32 || val < 0) throw new Error("UInt5 value is out of range");
 335         }
 336         public getVal(): number {
 337                 return this.val;
 338         }
 339 }
 340
 341 export class WitnessVersion {
 342         public constructor(private val: number) {
 343                 if (val > 16 || val < 0) throw new Error("WitnessVersion value is out of range");
 344         }
 345         public getVal(): number {
 346                 return this.val;
 347         }
 348 }
 349
 350 export class UnqualifiedError {
 351         public constructor(val: number) {}
 352 }
 353 """
 354
 355         self.txout_defn = """export class TxOut extends CommonBase {
 356         /** The script_pubkey in this output */
 357         public script_pubkey: Uint8Array;
 358         /** The value, in satoshis, of this output */
 359         public value: bigint;
 360
 361         /* @internal */
 362         public constructor(_dummy: object, ptr: number) {
 363                 super(ptr, bindings.TxOut_free);
 364                 this.script_pubkey = bindings.decodeUint8Array(bindings.TxOut_get_script_pubkey(ptr));
 365                 this.value = bindings.TxOut_get_value(ptr);
 366         }
 367         public constructor_new(value: bigint, script_pubkey: Uint8Array): TxOut {
 368                 return new TxOut(null, bindings.TxOut_new(bindings.encodeUint8Array(script_pubkey), value));
 369         }
 370 }"""
 371         self.obj_defined(["TxOut"], "structs")
 372
 373         self.c_file_pfx = """#include "js-wasm.h"
 374 #include <stdatomic.h>
 375 #include <lightning.h>
 376
 377 // These should be provided...somehow...
 378 void *memset(void *s, int c, size_t n);
 379 void *memcpy(void *dest, const void *src, size_t n);
 380 int memcmp(const void *s1, const void *s2, size_t n);
 381
 382 extern void __attribute__((noreturn)) abort(void);
 383 static inline void assert(bool expression) {
 384         if (!expression) { abort(); }
 385 }
 386
 387 uint32_t __attribute__((export_name("test_bigint_pass_deadbeef0badf00d"))) test_bigint_pass_deadbeef0badf00d(uint64_t val) {
 388         return val == 0xdeadbeef0badf00dULL;
 389 }
 390
 391 """
 392
 393         if not DEBUG:
 394             self.c_file_pfx += """
 395 void *malloc(size_t size);
 396 void free(void *ptr);
 397
 398 #define MALLOC(a, _) malloc(a)
 399 #define do_MALLOC(a, _b, _c) malloc(a)
 400 #define FREE(p) if ((unsigned long)(p) > 4096) { free(p); }
 401 #define DO_ASSERT(a) (void)(a)
 402 #define CHECK(a)
 403 #define CHECK_ACCESS(p)
 404 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v)
 405 """
 406         else:
 407             self.c_file_pfx += """
 408 extern int snprintf(char *str, size_t size, const char *format, ...);
 409 typedef int32_t ssize_t;
 410 ssize_t write(int fd, const void *buf, size_t count);
 411 #define DEBUG_PRINT(...) do { \\
 412         char debug_str[1024]; \\
 413         int s_len = snprintf(debug_str, 1023, __VA_ARGS__); \\
 414         write(2, debug_str, s_len); \\
 415 } while (0);
 416
 417 // Always run a, then assert it is true:
 418 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 419 // Assert a is true or do nothing
 420 #define CHECK(a) DO_ASSERT(a)
 421
 422 // Running a leak check across all the allocations and frees of the JDK is a mess,
 423 // so instead we implement our own naive leak checker here, relying on the -wrap
 424 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 425 // and free'd in Rust or C across the generated bindings shared library.
 426
 427 #define BT_MAX 128
 428 typedef struct allocation {
 429         struct allocation* next;
 430         void* ptr;
 431         const char* struct_name;
 432         int lineno;
 433 } allocation;
 434 static allocation* allocation_ll = NULL;
 435 static allocation* freed_ll = NULL;
 436
 437 extern void* __real_malloc(size_t len);
 438 extern void* __real_calloc(size_t nmemb, size_t len);
 439 extern void* __real_aligned_alloc(size_t alignment, size_t size);
 440 static void new_allocation(void* res, const char* struct_name, int lineno) {
 441         allocation* new_alloc = __real_malloc(sizeof(allocation));
 442         new_alloc->ptr = res;
 443         new_alloc->struct_name = struct_name;
 444         new_alloc->next = allocation_ll;
 445         new_alloc->lineno = lineno;
 446         allocation_ll = new_alloc;
 447 }
 448 static void* do_MALLOC(size_t len, const char* struct_name, int lineno) {
 449         void* res = __real_malloc(len);
 450         new_allocation(res, struct_name, lineno);
 451         return res;
 452 }
 453 #define MALLOC(len, struct_name) do_MALLOC(len, struct_name, __LINE__)
 454
 455 void __real_free(void* ptr);
 456 static void alloc_freed(void* ptr, int lineno) {
 457         allocation* p = NULL;
 458         allocation* it = allocation_ll;
 459         while (it->ptr != ptr) {
 460                 p = it; it = it->next;
 461                 if (it == NULL) {
 462                         p = NULL;
 463                         it = freed_ll;
 464                         while (it && it->ptr != ptr) { p = it; it = it->next; }
 465                         if (it == NULL) {
 466                                 DEBUG_PRINT("Tried to free unknown pointer %p at line %d.\\n", ptr, lineno);
 467                         } else {
 468                                 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);
 469                         }
 470                         abort();
 471                 }
 472         }
 473         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 474         DO_ASSERT(it->ptr == ptr);
 475         it->next = freed_ll;
 476         freed_ll = it;
 477 }
 478 static void do_FREE(void* ptr, int lineno) {
 479         if ((unsigned long)ptr <= 4096) return; // Rust loves to create pointers to the NULL page for dummys
 480         alloc_freed(ptr, lineno);
 481         __real_free(ptr);
 482 }
 483 #define FREE(ptr) do_FREE(ptr, __LINE__)
 484
 485 static void CHECK_ACCESS(const void* ptr) {
 486         allocation* it = allocation_ll;
 487         while (it->ptr != ptr) {
 488                 it = it->next;
 489                 if (it == NULL) {
 490                         return; // addrsan should catch malloc-unknown and print more info than we have
 491                 }
 492         }
 493 }
 494 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v) \\
 495         if (v.is_owned && v.inner != NULL) { \\
 496                 const void *p = __unmangle_inner_ptr(v.inner); \\
 497                 if (p != NULL) { \\
 498                         CHECK_ACCESS(p); \\
 499                 } \\
 500         }
 501
 502 void* __wrap_malloc(size_t len) {
 503         void* res = __real_malloc(len);
 504         new_allocation(res, "malloc call", 0);
 505         return res;
 506 }
 507 void* __wrap_calloc(size_t nmemb, size_t len) {
 508         void* res = __real_calloc(nmemb, len);
 509         new_allocation(res, "calloc call", 0);
 510         return res;
 511 }
 512 void* __wrap_aligned_alloc(size_t alignment, size_t size) {
 513         void* res = __real_aligned_alloc(alignment, size);
 514         new_allocation(res, "aligned_alloc call", 0);
 515         return res;
 516 }
 517 void __wrap_free(void* ptr) {
 518         if (ptr == NULL) return;
 519         alloc_freed(ptr, 0);
 520         __real_free(ptr);
 521 }
 522
 523 void* __real_realloc(void* ptr, size_t newlen);
 524 void* __wrap_realloc(void* ptr, size_t len) {
 525         if (ptr != NULL) alloc_freed(ptr, 0);
 526         void* res = __real_realloc(ptr, len);
 527         new_allocation(res, "realloc call", 0);
 528         return res;
 529 }
 530 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 531         // Rust doesn't seem to use reallocarray currently
 532         DO_ASSERT(false);
 533 }
 534
 535 uint32_t __attribute__((export_name("TS_allocs_remaining"))) allocs_remaining() {
 536         uint32_t count = 0;
 537         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 538                 count++;
 539         }
 540         return count;
 541 }
 542 void __attribute__((export_name("TS_print_leaks"))) print_leaks() {
 543         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 544                 DEBUG_PRINT("%s %p remains. Allocated on line %d\\n", a->struct_name, a->ptr, a->lineno);
 545         }
 546 }
 547 """
 548         self.c_file_pfx = self.c_file_pfx + """
 549 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 550 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 551 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 552 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 553
 554 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 555
 556 #define DECL_ARR_TYPE(ty, name) \\
 557         struct name##array { \\
 558                 uint32_t arr_len; \\
 559                 ty elems[]; \\
 560         }; \\
 561         typedef struct name##array * name##Array; \\
 562         static inline name##Array init_##name##Array(size_t arr_len, int lineno) { \\
 563                 name##Array arr = (name##Array)do_MALLOC(arr_len * sizeof(ty) + sizeof(uint32_t), #name" array init", lineno); \\
 564                 arr->arr_len = arr_len; \\
 565                 return arr; \\
 566         }
 567
 568 DECL_ARR_TYPE(int64_t, int64_t);
 569 DECL_ARR_TYPE(int8_t, int8_t);
 570 DECL_ARR_TYPE(uint32_t, uint32_t);
 571 DECL_ARR_TYPE(void*, ptr);
 572 DECL_ARR_TYPE(char, char);
 573 typedef charArray jstring;
 574
 575 static inline jstring str_ref_to_ts(const char* chars, size_t len) {
 576         charArray arr = init_charArray(len, __LINE__);
 577         memcpy(arr->elems, chars, len);
 578         return arr;
 579 }
 580 static inline LDKStr str_ref_to_owned_c(const jstring str) {
 581         char* newchars = MALLOC(str->arr_len + 1, "String chars");
 582         memcpy(newchars, str->elems, str->arr_len);
 583         newchars[str->arr_len] = 0;
 584         LDKStr res = {
 585                 .chars = newchars,
 586                 .len = str->arr_len,
 587                 .chars_is_owned = true
 588         };
 589         return res;
 590 }
 591
 592 typedef bool jboolean;
 593
 594 uint32_t __attribute__((export_name("TS_malloc"))) TS_malloc(uint32_t size) {
 595         return (uint32_t)MALLOC(size, "JS-Called malloc");
 596 }
 597 void __attribute__((export_name("TS_free"))) TS_free(uint32_t ptr) {
 598         FREE((void*)ptr);
 599 }
 600
 601 jstring __attribute__((export_name("TS_get_ldk_c_bindings_version"))) TS_get_ldk_c_bindings_version() {
 602         const char *res = check_get_ldk_bindings_version();
 603         if (res == NULL) return NULL;
 604         return str_ref_to_ts(res, strlen(res));
 605 }
 606 jstring __attribute__((export_name("TS_get_ldk_version"))) get_ldk_version() {
 607         const char *res = check_get_ldk_version();
 608         if (res == NULL) return NULL;
 609         return str_ref_to_ts(res, strlen(res));
 610 }
 611 #include "version.c"
 612 """
 613
 614         self.c_version_file = """jstring __attribute__((export_name("TS_get_lib_version_string"))) TS_get_lib_version_string() {
 615         return str_ref_to_ts("<git_version_ldk_garbagecollected>", strlen("<git_version_ldk_garbagecollected>"));
 616 }"""
 617
 618         self.hu_struct_file_prefix = """
 619 import { CommonBase, UInt5, WitnessVersion, UnqualifiedError } from './CommonBase.mjs';
 620 import * as bindings from '../bindings.mjs'
 621
 622 """
 623         self.util_fn_pfx = self.hu_struct_file_prefix + "\nexport class UtilMethods extends CommonBase {\n"
 624         self.util_fn_sfx = "}"
 625         self.c_fn_ty_pfx = ""
 626         self.file_ext = ".mts"
 627         self.ptr_c_ty = "uint32_t"
 628         self.ptr_native_ty = "number"
 629         self.result_c_ty = "uint32_t"
 630         self.ptr_arr = "ptrArray"
 631         self.is_arr_some_check = ("", " != 0")
 632         self.get_native_arr_len_call = ("", "->arr_len")
 633
 634     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 635         return None
 636     def create_native_arr_call(self, arr_len, ty_info):
 637         if ty_info.c_ty == "ptrArray":
 638             assert ty_info.rust_obj == "LDKCVec_u5Z" or (ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"))
 639         return "init_" + ty_info.c_ty + "(" + arr_len + ", __LINE__)"
 640     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 641         if ty_info.c_ty == "int8_tArray":
 642             return ("memcpy(" + arr_name + "->elems, ", ", " + arr_len + ")")
 643         else:
 644             assert False
 645     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 646         if ty_info.c_ty == "int8_tArray":
 647             if copy:
 648                 return "memcpy(" + dest_name + ", " + arr_name + "->elems, " + arr_len + "); FREE(" + arr_name + ")"
 649         if ty_info.c_ty == "ptrArray":
 650             return "(void*) " + arr_name + "->elems /* XXX " + arr_name + " leaks */"
 651         else:
 652             assert not copy
 653             return arr_name + "->elems /* XXX " + arr_name + " leaks */"
 654     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 655         assert False # Only called if above is None
 656     def get_native_arr_ptr_call(self, ty_info):
 657         if ty_info.subty is not None:
 658             return "(" + ty_info.subty.c_ty + "*)(((uint8_t*)", ") + 4)"
 659         return "(" + ty_info.c_ty + "*)(((uint8_t*)", ") + 4)"
 660     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 661         return None
 662     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 663         if ty_info.c_ty == "int8_tArray":
 664             return None
 665         else:
 666             return None
 667
 668     def map_hu_array_elems(self, arr_name, conv_name, arr_ty, elem_ty):
 669         if elem_ty.rust_obj == "LDKu5":
 670             return arr_name + " != null ? bindings.uint5ArrToBytes(" + arr_name + ") : null"
 671         assert elem_ty.c_ty == "uint32_t" or elem_ty.c_ty.endswith("Array")
 672         return arr_name + " != null ? " + arr_name + ".map(" + conv_name + " => " + elem_ty.from_hu_conv[0] + ") : null"
 673
 674     def str_ref_to_native_call(self, var_name, str_len):
 675         return "str_ref_to_ts(" + var_name + ", " + str_len + ")"
 676     def str_ref_to_c_call(self, var_name):
 677         return "str_ref_to_owned_c(" + var_name + ")"
 678     def str_to_hu_conv(self, var_name):
 679         return "const " + var_name + "_conv: string = bindings.decodeString(" + var_name + ");"
 680     def str_from_hu_conv(self, var_name):
 681         return ("bindings.encodeString(" + var_name + ")", "")
 682
 683     def c_fn_name_define_pfx(self, fn_name, have_args):
 684         return " __attribute__((export_name(\"TS_" + fn_name + "\"))) TS_" + fn_name + "("
 685
 686     def init_str(self):
 687         return ""
 688
 689     def get_java_arr_len(self, arr_name):
 690         return "bindings.getArrayLength(" + arr_name + ")"
 691     def get_java_arr_elem(self, elem_ty, arr_name, idx):
 692         if elem_ty.c_ty == "uint32_t" or elem_ty.c_ty == "uintptr_t" or elem_ty.c_ty.endswith("Array"):
 693             return "bindings.getU32ArrayElem(" + arr_name + ", " + idx + ")"
 694         elif elem_ty.rust_obj == "LDKu5":
 695             return "bindings.getU8ArrayElem(" + arr_name + ", " + idx + ")"
 696         else:
 697             assert False
 698     def constr_hu_array(self, ty_info, arr_len):
 699         return "new Array(" + arr_len + ").fill(null)"
 700     def cleanup_converted_native_array(self, ty_info, arr_name):
 701         return "bindings.freeWasmMemory(" + arr_name + ")"
 702
 703     def primitive_arr_from_hu(self, mapped_ty, fixed_len, arr_name):
 704         inner = arr_name
 705         if fixed_len is not None:
 706             assert mapped_ty.c_ty == "int8_t"
 707             inner = "bindings.check_arr_len(" + arr_name + ", " + fixed_len + ")"
 708         if mapped_ty.c_ty.endswith("Array"):
 709             return ("bindings.encodeUint32Array(" + inner + ")", "")
 710         elif mapped_ty.c_ty == "uint8_t" or mapped_ty.c_ty == "int8_t":
 711             return ("bindings.encodeUint8Array(" + inner + ")", "")
 712         elif mapped_ty.c_ty == "uint32_t":
 713             return ("bindings.encodeUint32Array(" + inner + ")", "")
 714         elif mapped_ty.c_ty == "int64_t":
 715             return ("bindings.encodeUint64Array(" + inner + ")", "")
 716         else:
 717             print(mapped_ty.c_ty)
 718             assert False
 719
 720     def primitive_arr_to_hu(self, mapped_ty, fixed_len, arr_name, conv_name):
 721         assert mapped_ty.c_ty == "uint8_t" or mapped_ty.c_ty == "int8_t"
 722         return "const " + conv_name + ": Uint8Array = bindings.decodeUint8Array(" + arr_name + ");"
 723
 724     def var_decl_statement(self, ty_string, var_name, statement):
 725         return "const " + var_name + ": " + ty_string + " = " + statement
 726
 727     def java_arr_ty_str(self, elem_ty_str):
 728         return "number"
 729
 730     def for_n_in_range(self, n, minimum, maximum):
 731         return "for (var " + n + " = " + minimum + "; " + n + " < " + maximum + "; " + n + "++) {"
 732     def for_n_in_arr(self, n, arr_name, arr_elem_ty):
 733         return (arr_name + ".forEach((" + n + ": " + arr_elem_ty.java_hu_ty + ") => { ", " })")
 734
 735     def get_ptr(self, var):
 736         return "CommonBase.get_ptr_of(" + var + ")"
 737     def set_null_skip_free(self, var):
 738         return "CommonBase.set_null_skip_free(" + var + ");"
 739
 740     def add_ref(self, holder, referent):
 741         return "CommonBase.add_ref_from(" + holder + ", " + referent + ")"
 742
 743     def obj_defined(self, struct_names, folder):
 744         with open(self.outdir + "/index.mts", 'a') as index:
 745             index.write(f"export * from './{folder}/{struct_names[0]}.mjs';\n")
 746         with open(self.outdir + "/imports.mts.part", 'a') as imports:
 747             imports.write(f"import {{ {', '.join(struct_names)} }} from '../{folder}/{struct_names[0]}.mjs';\n")
 748
 749     def fully_qualified_hu_ty_path(self, ty):
 750         return ty.java_hu_ty
 751
 752     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 753         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_js(int32_t ord) {\n"
 754         out_c = out_c + "\tswitch (ord) {\n"
 755         ord_v = 0
 756
 757         out_typescript_enum_fields = ""
 758
 759         for var, var_docs in variants:
 760             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 761             ord_v = ord_v + 1
 762             if var_docs is not None:
 763                 var_docs_repld = var_docs.replace("\n", "\n\t")
 764                 out_typescript_enum_fields += f"/**\n\t * {var_docs_repld}\n\t */\n"
 765             out_typescript_enum_fields += f"\t{var},\n\t"
 766         out_c = out_c + "\t}\n"
 767         out_c = out_c + "\tabort();\n"
 768         out_c = out_c + "}\n"
 769
 770         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_js(LDK" + struct_name + " val) {\n"
 771         out_c = out_c + "\tswitch (val) {\n"
 772         ord_v = 0
 773         for var, _ in variants:
 774             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 775             ord_v = ord_v + 1
 776         out_c = out_c + "\t\tdefault: abort();\n"
 777         out_c = out_c + "\t}\n"
 778         out_c = out_c + "}\n"
 779
 780         out_typescript = f"""
 781 /* @internal */
 782 export enum {struct_name} {{
 783         {out_typescript_enum_fields}
 784 }}
 785 """
 786         out_typescript_enum = f"export {{ {struct_name} }} from \"../bindings.mjs\";"
 787         self.obj_defined([struct_name], "enums")
 788         return (out_c, out_typescript_enum, out_typescript)
 789
 790     def c_unitary_enum_to_native_call(self, ty_info):
 791         return (ty_info.rust_obj + "_to_js(", ")")
 792     def native_unitary_enum_to_c_call(self, ty_info):
 793         return (ty_info.rust_obj + "_from_js(", ")")
 794
 795     def native_c_map_trait(self, struct_name, field_var_conversions, flattened_field_var_conversions, field_function_lines, trait_doc_comment):
 796         out_typescript_bindings = ""
 797         super_instantiator = ""
 798         bindings_instantiator = ""
 799         pointer_to_adder = ""
 800         impl_constructor_arguments = ""
 801         for var in flattened_field_var_conversions:
 802             if isinstance(var, ConvInfo):
 803                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 804                 super_instantiator += first_to_lower(var.arg_name) + ", "
 805                 if var.from_hu_conv is not None:
 806                     bindings_instantiator += ", " + var.from_hu_conv[0]
 807                     if var.from_hu_conv[1] != "":
 808                         pointer_to_adder += "\t\t\t" + var.from_hu_conv[1] + ";\n"
 809                 else:
 810                     bindings_instantiator += ", " + first_to_lower(var.arg_name)
 811             else:
 812                 bindings_instantiator += ", " + first_to_lower(var[1]) + ".bindings_instance"
 813                 super_instantiator += first_to_lower(var[1]) + "_impl, "
 814                 pointer_to_adder += "\t\timpl_holder.held.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 815                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}Interface"
 816
 817         super_constructor_statements = ""
 818         trait_constructor_arguments = ""
 819         for var in field_var_conversions:
 820             if isinstance(var, ConvInfo):
 821                 trait_constructor_arguments += ", " + var.arg_name
 822             else:
 823                 super_constructor_statements += "\t\tconst " + first_to_lower(var[1]) + " = " + var[1] + ".new_impl(" + super_instantiator + ");\n"
 824                 trait_constructor_arguments += ", " + first_to_lower(var[1]) + ".bindings_instance"
 825                 for suparg in var[2]:
 826                     if isinstance(suparg, ConvInfo):
 827                         trait_constructor_arguments += ", " + suparg.arg_name
 828                     else:
 829                         trait_constructor_arguments += ", " + suparg[1]
 830
 831         # BUILD INTERFACE METHODS
 832         out_java_interface = ""
 833         out_interface_implementation_overrides = ""
 834         java_methods = []
 835         for fn_line in field_function_lines:
 836             java_method_descriptor = ""
 837             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 838                 out_java_interface += "\t/**" + fn_line.docs.replace("\n", "\n\t * ") + "\n\t */\n"
 839                 out_java_interface += "\t" + fn_line.fn_name + "("
 840                 out_interface_implementation_overrides += f"\t\t\t{fn_line.fn_name} ("
 841
 842                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 843                     if idx >= 1:
 844                         out_java_interface += ", "
 845                         out_interface_implementation_overrides += ", "
 846                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 847                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 848                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 849                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n"
 850                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 851                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 852
 853                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 854
 855                 for arg_info in fn_line.args_ty:
 856                     if arg_info.to_hu_conv is not None:
 857                         out_interface_implementation_overrides += "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 858
 859                 if fn_line.ret_ty_info.java_ty != "void":
 860                     out_interface_implementation_overrides += "\t\t\t\tconst ret: " + fn_line.ret_ty_info.java_hu_ty + " = arg." + fn_line.fn_name + "("
 861                 else:
 862                     out_interface_implementation_overrides += f"\t\t\t\targ." + fn_line.fn_name + "("
 863
 864                 for idx, arg_info in enumerate(fn_line.args_ty):
 865                     if idx != 0:
 866                         out_interface_implementation_overrides += ", "
 867                     if arg_info.to_hu_conv_name is not None:
 868                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 869                     else:
 870                         out_interface_implementation_overrides += arg_info.arg_name
 871
 872                 out_interface_implementation_overrides += ");\n"
 873                 if fn_line.ret_ty_info.java_ty != "void":
 874                     if fn_line.ret_ty_info.from_hu_conv is not None:
 875                         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"
 876                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 877                             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"
 878                         #if fn_line.ret_ty_info.rust_obj in result_types:
 879                         # XXX: We need to handle this in conversion logic so that its cross-language!
 880                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 881                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 882                         out_interface_implementation_overrides += "\t\t\t\treturn result;\n"
 883                     else:
 884                         out_interface_implementation_overrides += "\t\t\t\treturn ret;\n"
 885                 out_interface_implementation_overrides += f"\t\t\t}},\n"
 886
 887         formatted_trait_docs = trait_doc_comment.replace("\n", "\n * ")
 888         out_typescript_human = f"""
 889 {self.hu_struct_file_prefix}
 890
 891 /** An implementation of {struct_name.replace("LDK","")} */
 892 export interface {struct_name.replace("LDK", "")}Interface {{
 893 {out_java_interface}}}
 894
 895 class {struct_name}Holder {{
 896         held: {struct_name.replace("LDK", "")};
 897 }}
 898
 899 /**
 900  * {formatted_trait_docs}
 901  */
 902 export class {struct_name.replace("LDK","")} extends CommonBase {{
 903         /* @internal */
 904         public bindings_instance?: bindings.{struct_name};
 905
 906         /* @internal */
 907         constructor(_dummy: object, ptr: number) {{
 908                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
 909                 this.bindings_instance = null;
 910         }}
 911
 912         /** Creates a new instance of {struct_name.replace("LDK","")} from a given implementation */
 913         public static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 914                 const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 915                 let structImplementation = {{
 916 {out_interface_implementation_overrides}                }} as bindings.{struct_name};
 917 {super_constructor_statements}          const ptr: number = bindings.{struct_name}_new(structImplementation{bindings_instantiator});
 918
 919                 impl_holder.held = new {struct_name.replace("LDK", "")}(null, ptr);
 920                 impl_holder.held.bindings_instance = structImplementation;
 921 {pointer_to_adder}              return impl_holder.held;
 922         }}
 923
 924 """
 925         self.obj_defined([struct_name.replace("LDK", ""), struct_name.replace("LDK", "") + "Interface"], "structs")
 926
 927         out_typescript_bindings += "/* @internal */\nexport interface " + struct_name + " {\n"
 928         java_meths = []
 929         for fn_line in field_function_lines:
 930             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 931                 out_typescript_bindings += f"\t{fn_line.fn_name} ("
 932
 933                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 934                     if idx >= 1:
 935                         out_typescript_bindings = out_typescript_bindings + ", "
 936                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 937
 938                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 939
 940         out_typescript_bindings += "}\n\n"
 941
 942         out_typescript_bindings += f"/* @internal */\nexport function {struct_name}_new(impl: {struct_name}"
 943         for var in flattened_field_var_conversions:
 944             if isinstance(var, ConvInfo):
 945                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 946             else:
 947                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 948
 949         out_typescript_bindings += f"""): number {{
 950         if(!isWasmInitialized) {{
 951                 throw new Error("initializeWasm() must be awaited first!");
 952         }}
 953         var new_obj_idx = js_objs.length;
 954         for (var i = 0; i < js_objs.length; i++) {{
 955                 if (js_objs[i] == null || js_objs[i] == undefined) {{ new_obj_idx = i; break; }}
 956         }}
 957         js_objs[i] = new WeakRef(impl);
 958         return wasm.TS_{struct_name}_new(i);
 959 }}
 960 """
 961
 962         # Now that we've written out our java code (and created java_meths), generate C
 963         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 964         out_c += "\tatomic_size_t refcnt;\n"
 965         out_c += "\tuint32_t instance_ptr;\n"
 966         for var in flattened_field_var_conversions:
 967             if isinstance(var, ConvInfo):
 968                 # We're a regular ol' field
 969                 pass
 970             else:
 971                 # We're a supertrait
 972                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 973         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 974
 975         for fn_line in field_function_lines:
 976             if fn_line.fn_name == "free":
 977                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 978                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 979                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 980                 out_c = out_c + "\t\tFREE(j_calls);\n"
 981                 out_c = out_c + "\t}\n}\n"
 982
 983         for idx, fn_line in enumerate(field_function_lines):
 984             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 985                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 986                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 987                 if fn_line.self_is_const:
 988                     out_c = out_c + "const void* this_arg"
 989                 else:
 990                     out_c = out_c + "void* this_arg"
 991
 992                 for idx, arg in enumerate(fn_line.args_ty):
 993                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 994
 995                 out_c = out_c + ") {\n"
 996                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 997
 998                 for arg_info in fn_line.args_ty:
 999                     if arg_info.ret_conv is not None:
1000                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
1001                         out_c = out_c + arg_info.arg_name
1002                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
1003
1004                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
1005                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (" + fn_line.ret_ty_info.c_ty + ")"
1006                     out_c += "js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1007                 elif fn_line.ret_ty_info.java_ty == "void":
1008                     out_c = out_c + "\tjs_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1009                 elif fn_line.ret_ty_info.java_hu_ty == "string":
1010                     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)
1011                 elif not fn_line.ret_ty_info.passed_as_ptr:
1012                     out_c = out_c + "\treturn js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1013                 else:
1014                     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)
1015
1016                 self.function_ptrs[self.function_ptr_counter] = (struct_name, fn_line.fn_name)
1017                 self.function_ptr_counter += 1
1018
1019                 for idx, arg_info in enumerate(fn_line.args_ty):
1020                     if arg_info.ret_conv is not None:
1021                         out_c = out_c + ", (uint32_t)" + arg_info.ret_conv_name
1022                     else:
1023                         out_c = out_c + ", (uint32_t)" + arg_info.arg_name
1024                 out_c = out_c + ");\n"
1025                 if fn_line.ret_ty_info.arg_conv is not None:
1026                     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"
1027
1028                 out_c = out_c + "}\n"
1029
1030         # Write out a clone function whether we need one or not, as we use them in moving to rust
1031         out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
1032         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
1033         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
1034         for var in field_var_conversions:
1035             if not isinstance(var, ConvInfo):
1036                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
1037         out_c = out_c + "}\n"
1038
1039         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (JSValue o"
1040         for var in flattened_field_var_conversions:
1041             if isinstance(var, ConvInfo):
1042                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
1043             else:
1044                 out_c = out_c + ", JSValue " + var[1]
1045         out_c = out_c + ") {\n"
1046
1047         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
1048         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
1049         out_c = out_c + "\tcalls->instance_ptr = o;\n"
1050
1051         for (fn_name, java_meth_descr) in java_meths:
1052             if fn_name != "free" and fn_name != "cloned":
1053                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
1054                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
1055
1056         for var in flattened_field_var_conversions:
1057             if isinstance(var, ConvInfo) and var.arg_conv is not None:
1058                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
1059         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
1060         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
1061         for fn_line in field_function_lines:
1062             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
1063                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
1064             elif fn_line.fn_name == "free":
1065                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
1066             else:
1067                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
1068         for var in field_var_conversions:
1069             if isinstance(var, ConvInfo):
1070                 if var.arg_conv_name is not None:
1071                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
1072                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
1073                 else:
1074                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
1075                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
1076             else:
1077                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(" + var[1]
1078                 for suparg in var[2]:
1079                     if isinstance(suparg, ConvInfo):
1080                         out_c += ", " + suparg.arg_name
1081                     else:
1082                         out_c += ", " + suparg[1]
1083                 out_c += "),\n"
1084         out_c = out_c + "\t};\n"
1085         for var in flattened_field_var_conversions:
1086             if not isinstance(var, ConvInfo):
1087                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
1088         out_c = out_c + "\treturn ret;\n"
1089         out_c = out_c + "}\n"
1090
1091         out_c = out_c + self.c_fn_ty_pfx + "long " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "JSValue o"
1092         for var in flattened_field_var_conversions:
1093             if isinstance(var, ConvInfo):
1094                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
1095             else:
1096                 out_c = out_c + ", JSValue " + var[1]
1097         out_c = out_c + ") {\n"
1098         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
1099         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(o"
1100         for var in flattened_field_var_conversions:
1101             if isinstance(var, ConvInfo):
1102                 out_c = out_c + ", " + var.arg_name
1103             else:
1104                 out_c = out_c + ", " + var[1]
1105         out_c = out_c + ");\n"
1106         out_c = out_c + "\treturn (long)res_ptr;\n"
1107         out_c = out_c + "}\n"
1108
1109         return (out_typescript_bindings, out_typescript_human, out_c)
1110
1111     def trait_struct_inc_refcnt(self, ty_info):
1112         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
1113         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
1114         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_cloned(&" + ty_info.var_name + "_conv);\n}"
1115         return base_conv
1116
1117     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
1118         bindings_type = struct_name.replace("LDK", "")
1119         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
1120
1121         out_java_enum = ""
1122         out_java = ""
1123         out_c = ""
1124
1125         out_java_enum += (self.hu_struct_file_prefix)
1126
1127         java_hu_class = "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
1128         java_hu_class += "export class " + java_hu_type + " extends CommonBase {\n"
1129         java_hu_class += "\tprotected constructor(_dummy: object, ptr: number) { super(ptr, bindings." + bindings_type + "_free); }\n"
1130         java_hu_class += "\t/* @internal */\n"
1131         java_hu_class += f"\tpublic static constr_from_ptr(ptr: number): {java_hu_type} {{\n"
1132         java_hu_class += f"\t\tconst raw_ty: number = bindings." + struct_name + "_ty_from_ptr(ptr);\n"
1133         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"
1134         out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n"
1135         out_c += "\tswitch(obj->tag) {\n"
1136         java_hu_class += "\t\tswitch (raw_ty) {\n"
1137         java_hu_subclasses = ""
1138
1139         out_java += "/* @internal */\nexport class " + struct_name + " {\n"
1140         out_java += "\tprotected constructor() {}\n"
1141         var_idx = 0
1142         for var in variant_list:
1143             java_hu_subclasses += "/** A " + java_hu_type + " of type " + var.var_name + " */\n"
1144             java_hu_subclasses += "export class " + java_hu_type + "_" + var.var_name + " extends " + java_hu_type + " {\n"
1145             java_hu_class += f"\t\t\tcase {var_idx}: "
1146             java_hu_class += "return new " + java_hu_type + "_" + var.var_name + "(ptr);\n"
1147             out_c += f"\t\tcase {struct_name}_{var.var_name}: return {var_idx};\n"
1148             hu_conv_body = ""
1149             for idx, (field_ty, field_docs) in enumerate(var.fields):
1150                 if field_docs is not None:
1151                     java_hu_subclasses += "\t/**\n\t * " + field_docs.replace("\n", "\n\t * ") + "\n\t */\n"
1152                 java_hu_subclasses += "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
1153                 if field_ty.to_hu_conv is not None:
1154                     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"
1155                     hu_conv_body += f"\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1156                     hu_conv_body += f"\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1157                 else:
1158                     hu_conv_body += f"\t\tthis.{field_ty.arg_name} = bindings.{struct_name}_{var.var_name}_get_{field_ty.arg_name}(ptr);\n"
1159             java_hu_subclasses += "\t/* @internal */\n"
1160             java_hu_subclasses += "\tpublic constructor(ptr: number) {\n\t\tsuper(null, ptr);\n"
1161             java_hu_subclasses = java_hu_subclasses + hu_conv_body
1162             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
1163             var_idx += 1
1164         out_java += "}\n"
1165         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"
1166         out_java += self.fn_call_body(struct_name + "_ty_from_ptr", "uint32_t", "number", "ptr: number", "ptr")
1167         out_c += ("\t\tdefault: abort();\n")
1168         out_c += ("\t}\n}\n")
1169
1170         for var in variant_list:
1171             for idx, (field_map, _) in enumerate(var.fields):
1172                 fn_name = f"{struct_name}_{var.var_name}_get_{field_map.arg_name}"
1173                 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"
1174                 out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n"
1175                 out_c += f"\tassert(obj->tag == {struct_name}_{var.var_name});\n"
1176                 if field_map.ret_conv is not None:
1177                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1178                     if var.tuple_variant:
1179                         out_c += "obj->" + camel_to_snake(var.var_name)
1180                     else:
1181                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
1182                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1183                     out_c += "\treturn " + field_map.ret_conv_name + ";\n"
1184                 else:
1185                     if var.tuple_variant:
1186                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + ";\n"
1187                     else:
1188                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name + ";\n"
1189                 out_c += "}\n"
1190                 out_java += self.fn_call_body(fn_name, field_map.c_ty, field_map.java_ty, "ptr: number", "ptr")
1191         out_java_enum += java_hu_class
1192         self.struct_file_suffixes[java_hu_type] = java_hu_subclasses
1193         self.obj_defined([java_hu_type], "structs")
1194         return (out_java, out_java_enum, out_c)
1195
1196     def map_opaque_struct(self, struct_name, struct_doc_comment):
1197         implementations = ""
1198         method_header = ""
1199
1200         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
1201         out_opaque_struct_human = f"{self.hu_struct_file_prefix}"
1202         if struct_name.startswith("LDKLocked") or struct_name.startswith("LDKReadOnly"):
1203             out_opaque_struct_human += "/** XXX: DO NOT USE THIS - it remains locked until the GC runs (if that ever happens */"
1204         formatted_doc_comment = struct_doc_comment.replace("\n", "\n * ")
1205         out_opaque_struct_human += f"""
1206 /**
1207  * {formatted_doc_comment}
1208  */
1209 export class {hu_name} extends CommonBase {implementations}{{
1210         /* @internal */
1211         public constructor(_dummy: object, ptr: number) {{
1212                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1213         }}
1214
1215 """
1216         self.obj_defined([hu_name], "structs")
1217         return out_opaque_struct_human
1218
1219     def map_tuple(self, struct_name):
1220         return self.map_opaque_struct(struct_name, "A Tuple")
1221
1222     def map_result(self, struct_name, res_map, err_map):
1223         human_ty = struct_name.replace("LDKCResult", "Result")
1224
1225         suffixes = f"export class {human_ty}_OK extends {human_ty} {{\n"
1226         if res_map.java_hu_ty != "void":
1227             suffixes += "\tpublic res: " + res_map.java_hu_ty + ";\n"
1228         suffixes += f"""
1229         /* @internal */
1230         public constructor(_dummy: object, ptr: number) {{
1231                 super(_dummy, ptr);
1232 """
1233         if res_map.java_hu_ty == "void":
1234             pass
1235         elif res_map.to_hu_conv is not None:
1236             suffixes += "\t\tconst res: " + res_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1237             suffixes += "\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t")
1238             suffixes += "\n\t\tthis.res = " + res_map.to_hu_conv_name + ";\n"
1239         else:
1240             suffixes += "\t\tthis.res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1241         suffixes += "\t}\n}\n"
1242
1243         suffixes += f"export class {human_ty}_Err extends {human_ty} {{\n"
1244         if err_map.java_hu_ty != "void":
1245             suffixes += "\tpublic err: " + err_map.java_hu_ty + ";\n"
1246         suffixes += f"""
1247         /* @internal */
1248         public constructor(_dummy: object, ptr: number) {{
1249                 super(_dummy, ptr);
1250 """
1251         if err_map.java_hu_ty == "void":
1252             pass
1253         elif err_map.to_hu_conv is not None:
1254             suffixes += "\t\tconst err: " + err_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1255             suffixes += "\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t")
1256             suffixes += "\n\t\tthis.err = " + err_map.to_hu_conv_name + ";\n"
1257         else:
1258             suffixes += "\t\tthis.err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1259         suffixes += "\t}\n}"
1260
1261         self.struct_file_suffixes[human_ty] = suffixes
1262         self.obj_defined([human_ty], "structs")
1263
1264         return f"""{self.hu_struct_file_prefix}
1265
1266 export class {human_ty} extends CommonBase {{
1267         protected constructor(_dummy: object, ptr: number) {{
1268                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1269         }}
1270         /* @internal */
1271         public static constr_from_ptr(ptr: number): {human_ty} {{
1272                 if (bindings.{struct_name.replace("LDK", "")}_is_ok(ptr)) {{
1273                         return new {human_ty}_OK(null, ptr);
1274                 }} else {{
1275                         return new {human_ty}_Err(null, ptr);
1276                 }}
1277         }}
1278 """
1279
1280     def fn_call_body(self, method_name, return_c_ty, return_java_ty, method_argument_string, native_call_argument_string):
1281         has_return_value = return_c_ty != 'void'
1282         return_statement = 'return nativeResponseValue;'
1283         if not has_return_value:
1284             return_statement = '// debug statements here'
1285
1286         return f"""/* @internal */
1287 export function {method_name}({method_argument_string}): {return_java_ty} {{
1288         if(!isWasmInitialized) {{
1289                 throw new Error("initializeWasm() must be awaited first!");
1290         }}
1291         const nativeResponseValue = wasm.TS_{method_name}({native_call_argument_string});
1292         {return_statement}
1293 }}
1294 """
1295     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):
1296         out_java = ""
1297         out_c = ""
1298         out_java_struct = None
1299
1300         out_java += ("\t")
1301         out_c += (self.c_fn_ty_pfx)
1302         out_c += (return_type_info.c_ty)
1303         out_java += (return_type_info.java_ty)
1304         if return_type_info.ret_conv is not None:
1305             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1306         out_java += (" " + method_name + "(")
1307         out_c += (" "  + self.c_fn_name_define_pfx(method_name, True))
1308
1309         method_argument_string = ""
1310         native_call_argument_string = ""
1311         for idx, arg_conv_info in enumerate(argument_types):
1312             if idx != 0:
1313                 method_argument_string += (", ")
1314                 native_call_argument_string += ', '
1315                 out_c += (", ")
1316             if arg_conv_info.c_ty != "void":
1317                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1318                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
1319                 native_call_argument_string += arg_conv_info.arg_name
1320         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)
1321
1322         out_java_struct = ""
1323         if doc_comment is not None:
1324             out_java_struct = "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
1325
1326         if not args_known:
1327             out_java_struct += ("\t// Skipped " + method_name + "\n")
1328         else:
1329             if not takes_self:
1330                 out_java_struct += (
1331                         "\tpublic static constructor_" + meth_n + "(")
1332             else:
1333                 out_java_struct += ("\tpublic " + meth_n + "(")
1334             for idx, arg in enumerate(argument_types):
1335                 if idx != 0:
1336                     if not takes_self or idx > 1:
1337                         out_java_struct += (", ")
1338                 elif takes_self:
1339                     continue
1340                 if arg.java_ty != "void":
1341                     if arg.arg_name in default_constructor_args:
1342                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1343                             if explode_idx != 0:
1344                                 out_java_struct += (", ")
1345                             out_java_struct += arg.arg_name + "_" + explode_arg.arg_name + ": " + explode_arg.java_hu_ty
1346                     else:
1347                         out_java_struct += arg.arg_name + ": " + arg.java_hu_ty
1348
1349         out_c += (") {\n")
1350         if out_java_struct is not None:
1351             out_java_struct += "): " + return_type_info.java_hu_ty + " {\n"
1352         for info in argument_types:
1353             if info.arg_conv is not None:
1354                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1355         if return_type_info.ret_conv is not None:
1356             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1357         elif return_type_info.c_ty != "void":
1358             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1359         else:
1360             out_c += ("\t")
1361         if c_call_string is None:
1362             out_c += (method_name + "(")
1363         else:
1364             out_c += (c_call_string)
1365         for idx, info in enumerate(argument_types):
1366             if info.arg_conv_name is not None:
1367                 if idx != 0:
1368                     out_c += (", ")
1369                 elif c_call_string is not None:
1370                     continue
1371                 out_c += (info.arg_conv_name)
1372         out_c += (")")
1373         if return_type_info.ret_conv is not None:
1374             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1375         else:
1376             out_c += (";")
1377         for info in argument_types:
1378             if info.arg_conv_cleanup is not None:
1379                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1380         if return_type_info.ret_conv is not None:
1381             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1382         elif return_type_info.c_ty != "void":
1383             out_c += ("\n\treturn ret_val;")
1384         out_c += ("\n}\n\n")
1385
1386         if args_known:
1387             out_java_struct += ("\t\t")
1388             if return_type_info.java_ty != "void":
1389                 out_java_struct += "const ret: " + return_type_info.java_ty + " = "
1390             out_java_struct += ("bindings." + method_name + "(")
1391             for idx, info in enumerate(argument_types):
1392                 if idx != 0:
1393                     out_java_struct += (", ")
1394                 if idx == 0 and takes_self:
1395                     out_java_struct += ("this.ptr")
1396                 elif info.arg_name in default_constructor_args:
1397                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1398                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1399                         if explode_idx != 0:
1400                             out_java_struct += (", ")
1401                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1402                         if explode_arg.from_hu_conv is not None:
1403                             out_java_struct += (
1404                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1405                         else:
1406                             out_java_struct += (expl_arg_name)
1407                     out_java_struct += (")")
1408                 elif info.from_hu_conv is not None:
1409                     out_java_struct += (info.from_hu_conv[0])
1410                 else:
1411                     out_java_struct += (info.arg_name)
1412             out_java_struct += (");\n")
1413             if return_type_info.to_hu_conv is not None:
1414                 if not takes_self:
1415                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1416                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1417                 else:
1418                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1419
1420             for idx, info in enumerate(argument_types):
1421                 if idx == 0 and takes_self:
1422                     pass
1423                 elif info.arg_name in default_constructor_args:
1424                     for explode_arg in default_constructor_args[info.arg_name]:
1425                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1426                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1427                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1428                                                                                              expl_arg_name).replace(
1429                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1430                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1431                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1432                         out_java_struct += (
1433                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1434                     else:
1435                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1436
1437             if return_type_info.to_hu_conv_name is not None:
1438                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1439             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1440                 out_java_struct += ("\t\treturn ret;\n")
1441             out_java_struct += ("\t}\n\n")
1442
1443         return (out_java, out_c, out_java_struct)
1444
1445     def cleanup(self):
1446         for struct in self.struct_file_suffixes:
1447             with open(self.outdir + "/structs/" + struct + self.file_ext, "a") as src:
1448                 src.write(self.struct_file_suffixes[struct])
1449
1450         with open(self.outdir + "/bindings.mts", "a") as bindings:
1451             bindings.write("""
1452
1453 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) {
1454         const weak: WeakRef<object> = js_objs[obj_ptr];
1455         if (weak == null || weak == undefined) {
1456                 console.error("Got function call on unknown/free'd JS object!");
1457                 throw new Error("Got function call on unknown/free'd JS object!");
1458         }
1459         const obj: object = weak.deref();
1460         if (obj == null || obj == undefined) {
1461                 console.error("Got function call on GC'd JS object!");
1462                 throw new Error("Got function call on GC'd JS object!");
1463         }
1464         var fn;
1465 """)
1466             bindings.write("\tswitch (fn_id) {\n")
1467             for f in self.function_ptrs:
1468                 bindings.write(f"\t\tcase {str(f)}: fn = Object.getOwnPropertyDescriptor(obj, \"{self.function_ptrs[f][1]}\"); break;\n")
1469
1470             bindings.write("""\t\tdefault:
1471                         console.error("Got unknown function call from C!");
1472                         throw new Error("Got unknown function call from C!");
1473         }
1474         if (fn == null || fn == undefined) {
1475                 console.error("Got function call on incorrect JS object!");
1476                 throw new Error("Got function call on incorrect JS object!");
1477         }
1478         return fn.value.bind(obj)(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10);
1479 }""")