_ 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, bytes_written_ptr: number) => {
  50                 // This should generally only be used to print panic messages
  51                 const ptr_len_view = new Uint32Array(wasm.memory.buffer, iovec_array_ptr, iovec_array_len * 2);
  52                 var bytes_written = 0;
  53                 for (var i = 0; i < iovec_array_len; i++) {
  54                         const bytes_view = new Uint8Array(wasm.memory.buffer, ptr_len_view[i*2], ptr_len_view[i*2+1]);
  55                         console.log("[fd " + fd + "]: " + String.fromCharCode(...bytes_view));
  56                         bytes_written += ptr_len_view[i*2+1];
  57                 }
  58                 const written_view = new Uint32Array(wasm.memory.buffer, bytes_written_ptr, 1);
  59                 written_view[0] = bytes_written;
  60                 return 0;
  61         },
  62         "fd_close": (_fd: number) => {
  63                 // This is not generally called, but may be referenced in debug builds
  64                 console.log("wasi_snapshot_preview1:fd_close");
  65                 return 58; // Not Supported
  66         },
  67         "fd_seek": (_fd: number, _offset: bigint, _whence: number, _new_offset: number) => {
  68                 // This is not generally called, but may be referenced in debug builds
  69                 console.log("wasi_snapshot_preview1:fd_seek");
  70                 return 58; // Not Supported
  71         },
  72         "random_get": (buf_ptr: number, buf_len: number) => {
  73                 const buf = new Uint8Array(wasm.memory.buffer, buf_ptr, buf_len);
  74                 getRandomValues(buf);
  75                 return 0;
  76         },
  77         "environ_sizes_get": (environ_var_count_ptr: number, environ_len_ptr: number) => {
  78                 // This is called before fd_write to format + print panic messages
  79                 const out_count_view = new Uint32Array(wasm.memory.buffer, environ_var_count_ptr, 1);
  80                 out_count_view[0] = 0;
  81                 const out_len_view = new Uint32Array(wasm.memory.buffer, environ_len_ptr, 1);
  82                 out_len_view[0] = 0;
  83                 return 0;
  84         },
  85         "environ_get": (environ_ptr: number, environ_buf_ptr: number) => {
  86                 // This is called before fd_write to format + print panic messages,
  87                 // but only if we have variables in environ_sizes_get, so shouldn't ever actually happen!
  88                 console.log("wasi_snapshot_preview1:environ_get");
  89                 return 58; // Note supported - we said there were 0 environment entries!
  90         },
  91         "proc_exit" : () => {
  92                 console.log("wasi_snapshot_preview1:proc_exit");
  93         },
  94 };
  95
  96 var wasm: any = null;
  97 let isWasmInitialized: boolean = false;
  98
  99 async function finishInitializeWasm(wasmInstance: WebAssembly.Instance) {
 100         if (typeof crypto === "undefined") {
 101                 var crypto_import = (await import('crypto')).webcrypto;
 102                 getRandomValues = crypto_import.getRandomValues.bind(crypto_import);
 103         } else {
 104                 getRandomValues = crypto.getRandomValues.bind(crypto);
 105         }
 106
 107         wasm = wasmInstance.exports;
 108         if (!wasm.test_bigint_pass_deadbeef0badf00d(BigInt("0xdeadbeef0badf00d"))) {
 109                 throw new Error(\"Currently need BigInt-as-u64 support, try ----experimental-wasm-bigint");
 110         }
 111
 112         if (decodeString(wasm.TS_get_lib_version_string()) !== version.get_ldk_java_bindings_version())
 113                 throw new Error(\"Compiled LDK library and LDK class files do not match\");
 114         // Fetching the LDK versions from C also checks that the header and binaries match
 115         const c_bindings_ver: number = wasm.TS_get_ldk_c_bindings_version();
 116         const ldk_ver: number = wasm.TS_get_ldk_version();
 117         if (c_bindings_ver == 0)
 118                 throw new Error(\"LDK version did not match the header we built against\");
 119         if (ldk_ver == 0)
 120                 throw new Error(\"LDK C bindings version did not match the header we built against\");
 121         const c_bindings_version: string = decodeString(c_bindings_ver)
 122         const ldk_version: string = decodeString(ldk_ver);
 123         console.log(\"Loaded LDK-Java Bindings with LDK \" + ldk_version + \" and LDK-C-Bindings \" + c_bindings_version);
 124
 125         isWasmInitialized = true;
 126 }
 127
 128 const fn_list = ["uuuuuu", "buuuuu", "bbuuuu", "bbbuuu", "bbbbuu",
 129         "bbbbbb", "ubuubu", "ubuuuu", "ubbuuu", "uubuuu", "uububu"];
 130
 131 /* @internal */
 132 export async function initializeWasmFromUint8Array(wasmBinary: Uint8Array) {
 133         for (const fn of fn_list) { imports.env["js_invoke_function_" + fn] = js_invoke; }
 134         const { instance: wasmInstance } = await WebAssembly.instantiate(wasmBinary, imports);
 135         await finishInitializeWasm(wasmInstance);
 136 }
 137
 138 /* @internal */
 139 export async function initializeWasmFetch(uri: string) {
 140         for (const fn of fn_list) { imports.env["js_invoke_function_" + fn] = js_invoke; }
 141         const stream = fetch(uri);
 142         const { instance: wasmInstance } = await WebAssembly.instantiateStreaming(stream, imports);
 143         await finishInitializeWasm(wasmInstance);
 144 }"""
 145
 146         self.bindings_header += """
 147 // WASM CODEC
 148
 149 /* @internal */
 150 export function uint5ArrToBytes(inputArray: Array<UInt5>): Uint8Array {
 151         const arr = new Uint8Array(inputArray.length);
 152         for (var i = 0; i < inputArray.length; i++) {
 153                 arr[i] = inputArray[i].getVal();
 154         }
 155         return arr;
 156 }
 157
 158 /* @internal */
 159 export function WitnessVersionArrToBytes(inputArray: Array<WitnessVersion>): Uint8Array {
 160         const arr = new Uint8Array(inputArray.length);
 161         for (var i = 0; i < inputArray.length; i++) {
 162                 arr[i] = inputArray[i].getVal();
 163         }
 164         return arr;
 165 }
 166
 167
 168
 169 /* @internal */
 170 export function encodeUint8Array (inputArray: Uint8Array): number {
 171         const cArrayPointer = wasm.TS_malloc(inputArray.length + 8);
 172         const arrayLengthView = new BigUint64Array(wasm.memory.buffer, cArrayPointer, 1);
 173         arrayLengthView[0] = BigInt(inputArray.length);
 174         const arrayMemoryView = new Uint8Array(wasm.memory.buffer, cArrayPointer + 8, inputArray.length);
 175         arrayMemoryView.set(inputArray);
 176         return cArrayPointer;
 177 }
 178 /* @internal */
 179 export function encodeUint32Array (inputArray: Uint32Array|Array<number>): number {
 180         const cArrayPointer = wasm.TS_malloc((inputArray.length + 2) * 4);
 181         const arrayLengthView = new BigUint64Array(wasm.memory.buffer, cArrayPointer, 1);
 182         arrayLengthView[0] = BigInt(inputArray.length);
 183         const arrayMemoryView = new Uint32Array(wasm.memory.buffer, cArrayPointer + 8, inputArray.length);
 184         arrayMemoryView.set(inputArray);
 185         return cArrayPointer;
 186 }
 187 /* @internal */
 188 export function encodeUint64Array (inputArray: BigUint64Array|Array<bigint>): number {
 189         const cArrayPointer = wasm.TS_malloc((inputArray.length + 1) * 8);
 190         const arrayMemoryView = new BigUint64Array(wasm.memory.buffer, cArrayPointer, 1);
 191         arrayMemoryView.set(inputArray, 1);
 192         arrayMemoryView[0] = BigInt(inputArray.length);
 193         return cArrayPointer;
 194 }
 195
 196 /* @internal */
 197 export function check_arr_len(arr: Uint8Array, len: number): Uint8Array {
 198         if (arr.length != len) { throw new Error("Expected array of length " + len + " got " + arr.length); }
 199         return arr;
 200 }
 201
 202 /* @internal */
 203 export function getArrayLength(arrayPointer: number): number {
 204         const arraySizeViewer = new BigUint64Array(wasm.memory.buffer, arrayPointer, 1);
 205         const len = arraySizeViewer[0];
 206         if (len >= (2n ** 32n)) throw new Error("Bogus Array Size");
 207         return Number(len % (2n ** 32n));
 208 }
 209 /* @internal */
 210 export function decodeUint8Array (arrayPointer: number, free = true): Uint8Array {
 211         const arraySize = getArrayLength(arrayPointer);
 212         const actualArrayViewer = new Uint8Array(wasm.memory.buffer, arrayPointer + 8, arraySize);
 213         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 214         // will free the underlying memory when it becomes unreachable instead of copying here.
 215         // Note that doing so may have edge-case interactions with memory resizing (invalidating the buffer).
 216         const actualArray = actualArrayViewer.slice(0, arraySize);
 217         if (free) {
 218                 wasm.TS_free(arrayPointer);
 219         }
 220         return actualArray;
 221 }
 222 const decodeUint32Array = (arrayPointer: number, free = true) => {
 223         const arraySize = getArrayLength(arrayPointer);
 224         const actualArrayViewer = new Uint32Array(
 225                 wasm.memory.buffer, // value
 226                 arrayPointer + 8, // offset (ignoring length bytes)
 227                 arraySize // uint32 count
 228         );
 229         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 230         // will free the underlying memory when it becomes unreachable instead of copying here.
 231         const actualArray = actualArrayViewer.slice(0, arraySize);
 232         if (free) {
 233                 wasm.TS_free(arrayPointer);
 234         }
 235         return actualArray;
 236 }
 237 /* @internal */
 238 export function decodeUint64Array (arrayPointer: number, free = true): bigint[] {
 239         const arraySize = getArrayLength(arrayPointer);
 240         const actualArrayViewer = new BigUint64Array(
 241                 wasm.memory.buffer, // value
 242                 arrayPointer + 8, // offset (ignoring length bytes)
 243                 arraySize // uint32 count
 244         );
 245         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 246         // will free the underlying memory when it becomes unreachable instead of copying here.
 247         const actualArray = new Array(arraySize);
 248         for (var i = 0; i < arraySize; i++) actualArray[i] = actualArrayViewer[i];
 249         if (free) {
 250                 wasm.TS_free(arrayPointer);
 251         }
 252         return actualArray;
 253 }
 254
 255 export function freeWasmMemory(pointer: number) { wasm.TS_free(pointer); }
 256
 257 /* @internal */
 258 export function getU64ArrayElem(arrayPointer: number, idx: number): bigint {
 259         const actualArrayViewer = new BigUint64Array(wasm.memory.buffer, arrayPointer + 8, idx + 1);
 260         return actualArrayViewer[idx];
 261 }
 262
 263 /* @internal */
 264 export function getU32ArrayElem(arrayPointer: number, idx: number): number {
 265         const actualArrayViewer = new Uint32Array(wasm.memory.buffer, arrayPointer + 8, idx + 1);
 266         return actualArrayViewer[idx];
 267 }
 268
 269 /* @internal */
 270 export function getU8ArrayElem(arrayPointer: number, idx: number): number {
 271         const actualArrayViewer = new Uint8Array(wasm.memory.buffer, arrayPointer + 8, idx + 1);
 272         return actualArrayViewer[idx];
 273 }
 274
 275
 276 /* @internal */
 277 export function encodeString(str: string): number {
 278         const charArray = new TextEncoder().encode(str);
 279         return encodeUint8Array(charArray);
 280 }
 281
 282 /* @internal */
 283 export function decodeString(stringPointer: number, free = true): string {
 284         const arraySize = getArrayLength(stringPointer);
 285         const memoryView = new Uint8Array(wasm.memory.buffer, stringPointer + 8, arraySize);
 286         const result = new TextDecoder("utf-8").decode(memoryView);
 287
 288         if (free) {
 289                 wasm.TS_free(stringPointer);
 290         }
 291
 292         return result;
 293 }
 294 """
 295         if DEBUG:
 296             self.bindings_header += """
 297 /* @internal */
 298 export function getRemainingAllocationCount(): number {
 299         return wasm.TS_allocs_remaining();
 300 }
 301 /* @internal */
 302 export function debugPrintRemainingAllocs() {
 303         wasm.TS_print_leaks();
 304 }
 305 """
 306         else:
 307             self.bindings_header += "\n/* @internal */ export function getRemainingAllocationCount(): number { return 0; }\n"
 308             self.bindings_header += "/* @internal */ export function debugPrintRemainingAllocs() { }\n"
 309
 310         with open(outdir + "/index.mts", 'a') as index:
 311             index.write("""import { initializeWasmFetch, initializeWasmFromUint8Array } from './bindings.mjs';
 312 /** Initializes the WASM backend by calling `fetch()` on the given URI - Browser only */
 313 export async function initializeWasmWebFetch(uri: string) {
 314         await initializeWasmFetch(uri);
 315 }
 316 /** Initializes the WASM backend given a Uint8Array of the .wasm binary file - Browser or Node.JS */
 317 export async function initializeWasmFromBinary(bin: Uint8Array) {
 318         await initializeWasmFromUint8Array(bin);
 319 }
 320
 321 """)
 322
 323         self.bindings_version_file = """export function get_ldk_java_bindings_version(): String {
 324         return "<git_version_ldk_garbagecollected>";
 325 }"""
 326
 327         self.bindings_footer = ""
 328
 329         self.common_base = """
 330 function freer(f: () => void) { f() }
 331 const finalizer = new FinalizationRegistry(freer);
 332 function get_freeer(ptr: bigint, free_fn: (ptr: bigint) => void) {
 333         return () => {
 334                 free_fn(ptr);
 335         }
 336 }
 337
 338 export class CommonBase {
 339         protected ptr: bigint;
 340         protected ptrs_to: object[] = [];
 341         protected constructor(ptr: bigint, free_fn: (ptr: bigint) => void) {
 342                 this.ptr = ptr;
 343                 if (ptr != 0n){
 344                         finalizer.register(this, get_freeer(ptr, free_fn), this);
 345                 }
 346         }
 347         // In Java, protected means "any subclass can access fields on any other subclass'"
 348         // In TypeScript, protected means "any subclass can access parent fields on instances of itself"
 349         // To work around this, we add accessors for other instances' protected fields here.
 350         protected static add_ref_from(holder: CommonBase, referent: object) {
 351                 if (holder !== null) { holder.ptrs_to.push(referent); }
 352         }
 353         protected static get_ptr_of(o: CommonBase) {
 354                 return o.ptr;
 355         }
 356         protected static set_null_skip_free(o: CommonBase) {
 357                 o.ptr = 0n;
 358                 // @ts-ignore TypeScript is wrong about the returnvalue of unregister here!
 359                 const did_unregister: boolean = finalizer.unregister(o);
 360                 if (!did_unregister)
 361                         throw new Error("FinalizationRegistry unregister should always unregister unless you double-free'd");
 362         }
 363 }
 364
 365 export class UInt5 {
 366         public constructor(private val: number) {
 367                 if (val > 32 || val < 0) throw new Error("UInt5 value is out of range");
 368         }
 369         public getVal(): number {
 370                 return this.val;
 371         }
 372 }
 373
 374 export class WitnessVersion {
 375         public constructor(private val: number) {
 376                 if (val > 16 || val < 0) throw new Error("WitnessVersion value is out of range");
 377         }
 378         public getVal(): number {
 379                 return this.val;
 380         }
 381 }
 382
 383 export class UnqualifiedError {
 384         public constructor(val: number) {}
 385 }
 386 """
 387
 388         self.txout_defn = """export class TxOut extends CommonBase {
 389         /** The script_pubkey in this output */
 390         public script_pubkey: Uint8Array;
 391         /** The value, in satoshis, of this output */
 392         public value: bigint;
 393
 394         /* @internal */
 395         public constructor(_dummy: object, ptr: bigint) {
 396                 super(ptr, bindings.TxOut_free);
 397                 this.script_pubkey = bindings.decodeUint8Array(bindings.TxOut_get_script_pubkey(ptr));
 398                 this.value = bindings.TxOut_get_value(ptr);
 399         }
 400         public static constructor_new(value: bigint, script_pubkey: Uint8Array): TxOut {
 401                 return new TxOut(null, bindings.TxOut_new(bindings.encodeUint8Array(script_pubkey), value));
 402         }
 403 }"""
 404         self.obj_defined(["TxOut"], "structs")
 405
 406         self.c_file_pfx = """#include "js-wasm.h"
 407 #include <stdatomic.h>
 408 #include <lightning.h>
 409
 410 // These should be provided...somehow...
 411 void *memset(void *s, int c, size_t n);
 412 void *memcpy(void *dest, const void *src, size_t n);
 413 int memcmp(const void *s1, const void *s2, size_t n);
 414
 415 extern void __attribute__((noreturn)) abort(void);
 416 static inline void assert(bool expression) {
 417         if (!expression) { abort(); }
 418 }
 419
 420 uint32_t __attribute__((export_name("test_bigint_pass_deadbeef0badf00d"))) test_bigint_pass_deadbeef0badf00d(uint64_t val) {
 421         return val == 0xdeadbeef0badf00dULL;
 422 }
 423
 424 """
 425
 426         if not DEBUG:
 427             self.c_file_pfx += """
 428 void *malloc(size_t size);
 429 void free(void *ptr);
 430
 431 #define MALLOC(a, _) malloc(a)
 432 #define do_MALLOC(a, _b, _c) malloc(a)
 433 #define FREE(p) if ((unsigned long)(p) > 4096) { free(p); }
 434 #define DO_ASSERT(a) (void)(a)
 435 #define CHECK(a)
 436 #define CHECK_ACCESS(p)
 437 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v)
 438 """
 439         else:
 440             self.c_file_pfx += """
 441 extern int snprintf(char *str, size_t size, const char *format, ...);
 442 typedef int32_t ssize_t;
 443 ssize_t write(int fd, const void *buf, size_t count);
 444 #define DEBUG_PRINT(...) do { \\
 445         char debug_str[1024]; \\
 446         int s_len = snprintf(debug_str, 1023, __VA_ARGS__); \\
 447         write(2, debug_str, s_len); \\
 448 } while (0);
 449
 450 // Always run a, then assert it is true:
 451 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 452 // Assert a is true or do nothing
 453 #define CHECK(a) DO_ASSERT(a)
 454
 455 // Running a leak check across all the allocations and frees of the JDK is a mess,
 456 // so instead we implement our own naive leak checker here, relying on the -wrap
 457 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 458 // and free'd in Rust or C across the generated bindings shared library.
 459
 460 #define BT_MAX 128
 461 typedef struct allocation {
 462         struct allocation* next;
 463         void* ptr;
 464         const char* struct_name;
 465         int lineno;
 466 } allocation;
 467 static allocation* allocation_ll = NULL;
 468 static allocation* freed_ll = NULL;
 469
 470 extern void* __real_malloc(size_t len);
 471 extern void* __real_calloc(size_t nmemb, size_t len);
 472 extern void* __real_aligned_alloc(size_t alignment, size_t size);
 473 static void new_allocation(void* res, const char* struct_name, int lineno) {
 474         allocation* new_alloc = __real_malloc(sizeof(allocation));
 475         new_alloc->ptr = res;
 476         new_alloc->struct_name = struct_name;
 477         new_alloc->next = allocation_ll;
 478         new_alloc->lineno = lineno;
 479         allocation_ll = new_alloc;
 480 }
 481 static void* do_MALLOC(size_t len, const char* struct_name, int lineno) {
 482         void* res = __real_malloc(len);
 483         new_allocation(res, struct_name, lineno);
 484         return res;
 485 }
 486 #define MALLOC(len, struct_name) do_MALLOC(len, struct_name, __LINE__)
 487
 488 void __real_free(void* ptr);
 489 static void alloc_freed(void* ptr, int lineno) {
 490         allocation* p = NULL;
 491         allocation* it = allocation_ll;
 492         while (it->ptr != ptr) {
 493                 p = it; it = it->next;
 494                 if (it == NULL) {
 495                         p = NULL;
 496                         it = freed_ll;
 497                         while (it && it->ptr != ptr) { p = it; it = it->next; }
 498                         if (it == NULL) {
 499                                 DEBUG_PRINT("Tried to free unknown pointer %p at line %d.\\n", ptr, lineno);
 500                         } else {
 501                                 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);
 502                         }
 503                         abort();
 504                 }
 505         }
 506         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 507         DO_ASSERT(it->ptr == ptr);
 508         it->next = freed_ll;
 509         freed_ll = it;
 510 }
 511 static void do_FREE(void* ptr, int lineno) {
 512         if ((unsigned long)ptr <= 4096) return; // Rust loves to create pointers to the NULL page for dummys
 513         alloc_freed(ptr, lineno);
 514         __real_free(ptr);
 515 }
 516 #define FREE(ptr) do_FREE(ptr, __LINE__)
 517
 518 static void CHECK_ACCESS(const void* ptr) {
 519         allocation* it = allocation_ll;
 520         while (it->ptr != ptr) {
 521                 it = it->next;
 522                 if (it == NULL) {
 523                         return; // addrsan should catch malloc-unknown and print more info than we have
 524                 }
 525         }
 526 }
 527 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v) \\
 528         if (v.is_owned && v.inner != NULL) { \\
 529                 const void *p = __unmangle_inner_ptr(v.inner); \\
 530                 if (p != NULL) { \\
 531                         CHECK_ACCESS(p); \\
 532                 } \\
 533         }
 534
 535 void* __wrap_malloc(size_t len) {
 536         void* res = __real_malloc(len);
 537         new_allocation(res, "malloc call", 0);
 538         return res;
 539 }
 540 void* __wrap_calloc(size_t nmemb, size_t len) {
 541         void* res = __real_calloc(nmemb, len);
 542         new_allocation(res, "calloc call", 0);
 543         return res;
 544 }
 545 void* __wrap_aligned_alloc(size_t alignment, size_t size) {
 546         void* res = __real_aligned_alloc(alignment, size);
 547         new_allocation(res, "aligned_alloc call", 0);
 548         return res;
 549 }
 550 void __wrap_free(void* ptr) {
 551         if (ptr == NULL) return;
 552         alloc_freed(ptr, 0);
 553         __real_free(ptr);
 554 }
 555
 556 void* __real_realloc(void* ptr, size_t newlen);
 557 void* __wrap_realloc(void* ptr, size_t len) {
 558         if (ptr != NULL) alloc_freed(ptr, 0);
 559         void* res = __real_realloc(ptr, len);
 560         new_allocation(res, "realloc call", 0);
 561         return res;
 562 }
 563 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 564         // Rust doesn't seem to use reallocarray currently
 565         DO_ASSERT(false);
 566 }
 567
 568 uint32_t __attribute__((export_name("TS_allocs_remaining"))) allocs_remaining() {
 569         uint32_t count = 0;
 570         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 571                 count++;
 572         }
 573         return count;
 574 }
 575 void __attribute__((export_name("TS_print_leaks"))) print_leaks() {
 576         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 577                 DEBUG_PRINT("%s %p remains. Allocated on line %d\\n", a->struct_name, a->ptr, a->lineno);
 578         }
 579 }
 580 """
 581         self.c_file_pfx = self.c_file_pfx + """
 582 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 583 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 584 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 585 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 586
 587 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 588
 589 #define DECL_ARR_TYPE(ty, name) \\
 590         struct name##array { \\
 591                 uint64_t arr_len; /* uint32_t would suffice but we want to align uint64_ts as well */ \\
 592                 ty elems[]; \\
 593         }; \\
 594         typedef struct name##array * name##Array; \\
 595         static inline name##Array init_##name##Array(size_t arr_len, int lineno) { \\
 596                 name##Array arr = (name##Array)do_MALLOC(arr_len * sizeof(ty) + sizeof(uint64_t), #name" array init", lineno); \\
 597                 arr->arr_len = arr_len; \\
 598                 return arr; \\
 599         }
 600
 601 DECL_ARR_TYPE(int64_t, int64_t);
 602 DECL_ARR_TYPE(uint64_t, uint64_t);
 603 DECL_ARR_TYPE(int8_t, int8_t);
 604 DECL_ARR_TYPE(uint32_t, uint32_t);
 605 DECL_ARR_TYPE(void*, ptr);
 606 DECL_ARR_TYPE(char, char);
 607 typedef charArray jstring;
 608
 609 static inline jstring str_ref_to_ts(const char* chars, size_t len) {
 610         charArray arr = init_charArray(len, __LINE__);
 611         memcpy(arr->elems, chars, len);
 612         return arr;
 613 }
 614 static inline LDKStr str_ref_to_owned_c(const jstring str) {
 615         char* newchars = MALLOC(str->arr_len + 1, "String chars");
 616         memcpy(newchars, str->elems, str->arr_len);
 617         newchars[str->arr_len] = 0;
 618         LDKStr res = {
 619                 .chars = newchars,
 620                 .len = str->arr_len,
 621                 .chars_is_owned = true
 622         };
 623         return res;
 624 }
 625
 626 typedef bool jboolean;
 627
 628 uint32_t __attribute__((export_name("TS_malloc"))) TS_malloc(uint32_t size) {
 629         return (uint32_t)MALLOC(size, "JS-Called malloc");
 630 }
 631 void __attribute__((export_name("TS_free"))) TS_free(uint32_t ptr) {
 632         FREE((void*)ptr);
 633 }
 634
 635 jstring __attribute__((export_name("TS_get_ldk_c_bindings_version"))) TS_get_ldk_c_bindings_version() {
 636         const char *res = check_get_ldk_bindings_version();
 637         if (res == NULL) return NULL;
 638         return str_ref_to_ts(res, strlen(res));
 639 }
 640 jstring __attribute__((export_name("TS_get_ldk_version"))) get_ldk_version() {
 641         const char *res = check_get_ldk_version();
 642         if (res == NULL) return NULL;
 643         return str_ref_to_ts(res, strlen(res));
 644 }
 645 #include "version.c"
 646 """
 647
 648         self.c_version_file = """jstring __attribute__((export_name("TS_get_lib_version_string"))) TS_get_lib_version_string() {
 649         return str_ref_to_ts("<git_version_ldk_garbagecollected>", strlen("<git_version_ldk_garbagecollected>"));
 650 }"""
 651
 652         self.hu_struct_file_prefix = """
 653 import { CommonBase, UInt5, WitnessVersion, UnqualifiedError } from './CommonBase.mjs';
 654 import * as bindings from '../bindings.mjs'
 655
 656 """
 657         self.util_fn_pfx = self.hu_struct_file_prefix + "\nexport class UtilMethods extends CommonBase {\n"
 658         self.util_fn_sfx = "}"
 659         self.c_fn_ty_pfx = ""
 660         self.file_ext = ".mts"
 661         self.ptr_c_ty = "uint64_t"
 662         self.ptr_native_ty = "bigint"
 663         self.usize_c_ty = "uint32_t"
 664         self.usize_native_ty = "number"
 665         self.native_zero_ptr = "0n"
 666         self.result_c_ty = "uint32_t"
 667         self.ptr_arr = "ptrArray"
 668         self.is_arr_some_check = ("", " != 0")
 669         self.get_native_arr_len_call = ("", "->arr_len")
 670
 671     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 672         return None
 673     def create_native_arr_call(self, arr_len, ty_info):
 674         if ty_info.c_ty == "ptrArray":
 675             assert ty_info.rust_obj == "LDKCVec_u5Z" or (ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array"))
 676         return "init_" + ty_info.c_ty + "(" + arr_len + ", __LINE__)"
 677     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 678         if ty_info.c_ty == "int8_tArray":
 679             return ("memcpy(" + arr_name + "->elems, ", ", " + arr_len + ")")
 680         else:
 681             assert False
 682     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 683         if ty_info.c_ty == "int8_tArray":
 684             if copy:
 685                 return "memcpy(" + dest_name + ", " + arr_name + "->elems, " + arr_len + "); FREE(" + arr_name + ")"
 686         assert not copy
 687         if ty_info.c_ty == "ptrArray":
 688             return "(void*) " + arr_name + "->elems"
 689         else:
 690             return arr_name + "->elems"
 691     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 692         assert False # Only called if above is None
 693     def get_native_arr_ptr_call(self, ty_info):
 694         if ty_info.subty is not None:
 695             return "(" + ty_info.subty.c_ty + "*)(((uint8_t*)", ") + 8)"
 696         return "(" + ty_info.c_ty + "*)(((uint8_t*)", ") + 8)"
 697     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 698         return None
 699     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 700         if ty_info.c_ty == "int8_tArray":
 701             return "FREE(" + arr_name + ");"
 702         else:
 703             return "FREE(" + arr_name + ")"
 704
 705     def map_hu_array_elems(self, arr_name, conv_name, arr_ty, elem_ty):
 706         if elem_ty.rust_obj == "LDKu5":
 707             return arr_name + " != null ? bindings.uint5ArrToBytes(" + arr_name + ") : null"
 708         assert elem_ty.c_ty == "uint64_t" or elem_ty.c_ty.endswith("Array")
 709         return arr_name + " != null ? " + arr_name + ".map(" + conv_name + " => " + elem_ty.from_hu_conv[0] + ") : null"
 710
 711     def str_ref_to_native_call(self, var_name, str_len):
 712         return "str_ref_to_ts(" + var_name + ", " + str_len + ")"
 713     def str_ref_to_c_call(self, var_name):
 714         return "str_ref_to_owned_c(" + var_name + ")"
 715     def str_to_hu_conv(self, var_name):
 716         return "const " + var_name + "_conv: string = bindings.decodeString(" + var_name + ");"
 717     def str_from_hu_conv(self, var_name):
 718         return ("bindings.encodeString(" + var_name + ")", "")
 719
 720     def c_fn_name_define_pfx(self, fn_name, have_args):
 721         return " __attribute__((export_name(\"TS_" + fn_name + "\"))) TS_" + fn_name + "("
 722
 723     def init_str(self):
 724         return ""
 725
 726     def get_java_arr_len(self, arr_name):
 727         return "bindings.getArrayLength(" + arr_name + ")"
 728     def get_java_arr_elem(self, elem_ty, arr_name, idx):
 729         if elem_ty.c_ty.endswith("Array") or elem_ty.c_ty == "uintptr_t":
 730             return "bindings.getU32ArrayElem(" + arr_name + ", " + idx + ")"
 731         elif elem_ty.c_ty == "uint64_t":
 732             return "bindings.getU64ArrayElem(" + arr_name + ", " + idx + ")"
 733         elif elem_ty.rust_obj == "LDKu5":
 734             return "bindings.getU8ArrayElem(" + arr_name + ", " + idx + ")"
 735         else:
 736             assert False
 737     def constr_hu_array(self, ty_info, arr_len):
 738         return "new Array(" + arr_len + ").fill(null)"
 739     def cleanup_converted_native_array(self, ty_info, arr_name):
 740         return "bindings.freeWasmMemory(" + arr_name + ")"
 741
 742     def primitive_arr_from_hu(self, mapped_ty, fixed_len, arr_name):
 743         inner = arr_name
 744         if fixed_len is not None:
 745             assert mapped_ty.c_ty == "int8_t"
 746             inner = "bindings.check_arr_len(" + arr_name + ", " + fixed_len + ")"
 747         if mapped_ty.c_ty.endswith("Array"):
 748             return ("bindings.encodeUint32Array(" + inner + ")", "")
 749         elif mapped_ty.c_ty == "uint8_t" or mapped_ty.c_ty == "int8_t":
 750             return ("bindings.encodeUint8Array(" + inner + ")", "")
 751         elif mapped_ty.c_ty == "uint32_t":
 752             return ("bindings.encodeUint32Array(" + inner + ")", "")
 753         elif mapped_ty.c_ty == "int64_t" or mapped_ty.c_ty == "uint64_t":
 754             return ("bindings.encodeUint64Array(" + inner + ")", "")
 755         else:
 756             print(mapped_ty.c_ty)
 757             assert False
 758
 759     def primitive_arr_to_hu(self, mapped_ty, fixed_len, arr_name, conv_name):
 760         if mapped_ty.c_ty == "uint8_t" or mapped_ty.c_ty == "int8_t":
 761             return "const " + conv_name + ": Uint8Array = bindings.decodeUint8Array(" + arr_name + ");"
 762         elif mapped_ty.c_ty == "uint64_t" or mapped_ty.c_ty == "int64_t":
 763             return "const " + conv_name + ": bigint[] = bindings.decodeUint64Array(" + arr_name + ");"
 764         else:
 765             assert False
 766
 767     def var_decl_statement(self, ty_string, var_name, statement):
 768         return "const " + var_name + ": " + ty_string + " = " + statement
 769
 770     def java_arr_ty_str(self, elem_ty_str):
 771         return "number"
 772
 773     def for_n_in_range(self, n, minimum, maximum):
 774         return "for (var " + n + " = " + minimum + "; " + n + " < " + maximum + "; " + n + "++) {"
 775     def for_n_in_arr(self, n, arr_name, arr_elem_ty):
 776         return (arr_name + ".forEach((" + n + ": " + arr_elem_ty.java_hu_ty + ") => { ", " })")
 777
 778     def get_ptr(self, var):
 779         return "CommonBase.get_ptr_of(" + var + ")"
 780     def set_null_skip_free(self, var):
 781         return "CommonBase.set_null_skip_free(" + var + ");"
 782
 783     def add_ref(self, holder, referent):
 784         return "CommonBase.add_ref_from(" + holder + ", " + referent + ")"
 785
 786     def obj_defined(self, struct_names, folder):
 787         with open(self.outdir + "/index.mts", 'a') as index:
 788             index.write(f"export * from './{folder}/{struct_names[0]}.mjs';\n")
 789         with open(self.outdir + "/imports.mts.part", 'a') as imports:
 790             imports.write(f"import {{ {', '.join(struct_names)} }} from '../{folder}/{struct_names[0]}.mjs';\n")
 791
 792     def fully_qualified_hu_ty_path(self, ty):
 793         return ty.java_hu_ty
 794
 795     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 796         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_js(int32_t ord) {\n"
 797         out_c = out_c + "\tswitch (ord) {\n"
 798         ord_v = 0
 799
 800         out_typescript_enum_fields = ""
 801
 802         for var, var_docs in variants:
 803             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 804             ord_v = ord_v + 1
 805             if var_docs is not None:
 806                 var_docs_repld = var_docs.replace("\n", "\n\t")
 807                 out_typescript_enum_fields += f"/**\n\t * {var_docs_repld}\n\t */\n"
 808             out_typescript_enum_fields += f"\t{var},\n\t"
 809         out_c = out_c + "\t}\n"
 810         out_c = out_c + "\tabort();\n"
 811         out_c = out_c + "}\n"
 812
 813         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_js(LDK" + struct_name + " val) {\n"
 814         out_c = out_c + "\tswitch (val) {\n"
 815         ord_v = 0
 816         for var, _ in variants:
 817             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 818             ord_v = ord_v + 1
 819         out_c = out_c + "\t\tdefault: abort();\n"
 820         out_c = out_c + "\t}\n"
 821         out_c = out_c + "}\n"
 822
 823         # Note that this is *not* marked /* @internal */ as we re-expose it directly in enums/
 824         enum_comment_formatted = enum_doc_comment.replace("\n", "\n * ")
 825         out_typescript = f"""
 826 /**
 827  * {enum_comment_formatted}
 828  */
 829 export enum {struct_name} {{
 830         {out_typescript_enum_fields}
 831 }}
 832 """
 833         out_typescript_enum = f"export {{ {struct_name} }} from \"../bindings.mjs\";"
 834         self.obj_defined([struct_name], "enums")
 835         return (out_c, out_typescript_enum, out_typescript)
 836
 837     def c_unitary_enum_to_native_call(self, ty_info):
 838         return (ty_info.rust_obj + "_to_js(", ")")
 839     def native_unitary_enum_to_c_call(self, ty_info):
 840         return (ty_info.rust_obj + "_from_js(", ")")
 841
 842     def native_c_map_trait(self, struct_name, field_var_conversions, flattened_field_var_conversions, field_function_lines, trait_doc_comment):
 843         out_typescript_bindings = ""
 844         super_instantiator = ""
 845         bindings_instantiator = ""
 846         pointer_to_adder = ""
 847         impl_constructor_arguments = ""
 848         for var in flattened_field_var_conversions:
 849             if isinstance(var, ConvInfo):
 850                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 851                 super_instantiator += first_to_lower(var.arg_name) + ", "
 852                 if var.from_hu_conv is not None:
 853                     bindings_instantiator += ", " + var.from_hu_conv[0]
 854                     if var.from_hu_conv[1] != "":
 855                         pointer_to_adder += "\t\t\t" + var.from_hu_conv[1] + ";\n"
 856                 else:
 857                     bindings_instantiator += ", " + first_to_lower(var.arg_name)
 858             else:
 859                 bindings_instantiator += ", " + first_to_lower(var[1]) + ".bindings_instance"
 860                 super_instantiator += first_to_lower(var[1]) + "_impl, "
 861                 pointer_to_adder += "\t\timpl_holder.held.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 862                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}Interface"
 863
 864         super_constructor_statements = ""
 865         trait_constructor_arguments = ""
 866         for var in field_var_conversions:
 867             if isinstance(var, ConvInfo):
 868                 trait_constructor_arguments += ", " + var.arg_name
 869             else:
 870                 super_constructor_statements += "\t\tconst " + first_to_lower(var[1]) + " = " + var[1] + ".new_impl(" + super_instantiator + ");\n"
 871                 trait_constructor_arguments += ", " + first_to_lower(var[1]) + ".bindings_instance"
 872                 for suparg in var[2]:
 873                     if isinstance(suparg, ConvInfo):
 874                         trait_constructor_arguments += ", " + suparg.arg_name
 875                     else:
 876                         trait_constructor_arguments += ", " + suparg[1]
 877
 878         # BUILD INTERFACE METHODS
 879         out_java_interface = ""
 880         out_interface_implementation_overrides = ""
 881         java_methods = []
 882         for fn_line in field_function_lines:
 883             java_method_descriptor = ""
 884             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 885                 out_java_interface += "\t/**" + fn_line.docs.replace("\n", "\n\t * ") + "\n\t */\n"
 886                 out_java_interface += "\t" + fn_line.fn_name + "("
 887                 out_interface_implementation_overrides += f"\t\t\t{fn_line.fn_name} ("
 888
 889                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 890                     if idx >= 1:
 891                         out_java_interface += ", "
 892                         out_interface_implementation_overrides += ", "
 893                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 894                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 895                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 896                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n"
 897                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 898                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 899
 900                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 901
 902                 for arg_info in fn_line.args_ty:
 903                     if arg_info.to_hu_conv is not None:
 904                         out_interface_implementation_overrides += "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 905
 906                 if fn_line.ret_ty_info.java_ty != "void":
 907                     out_interface_implementation_overrides += "\t\t\t\tconst ret: " + fn_line.ret_ty_info.java_hu_ty + " = arg." + fn_line.fn_name + "("
 908                 else:
 909                     out_interface_implementation_overrides += f"\t\t\t\targ." + fn_line.fn_name + "("
 910
 911                 for idx, arg_info in enumerate(fn_line.args_ty):
 912                     if idx != 0:
 913                         out_interface_implementation_overrides += ", "
 914                     if arg_info.to_hu_conv_name is not None:
 915                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 916                     else:
 917                         out_interface_implementation_overrides += arg_info.arg_name
 918
 919                 out_interface_implementation_overrides += ");\n"
 920                 if fn_line.ret_ty_info.java_ty != "void":
 921                     if fn_line.ret_ty_info.from_hu_conv is not None:
 922                         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"
 923                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 924                             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"
 925                         #if fn_line.ret_ty_info.rust_obj in result_types:
 926                         # XXX: We need to handle this in conversion logic so that its cross-language!
 927                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 928                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 929                         out_interface_implementation_overrides += "\t\t\t\treturn result;\n"
 930                     else:
 931                         out_interface_implementation_overrides += "\t\t\t\treturn ret;\n"
 932                 out_interface_implementation_overrides += f"\t\t\t}},\n"
 933
 934         formatted_trait_docs = trait_doc_comment.replace("\n", "\n * ")
 935         out_typescript_human = f"""
 936 {self.hu_struct_file_prefix}
 937
 938 /** An implementation of {struct_name.replace("LDK","")} */
 939 export interface {struct_name.replace("LDK", "")}Interface {{
 940 {out_java_interface}}}
 941
 942 class {struct_name}Holder {{
 943         held: {struct_name.replace("LDK", "")};
 944 }}
 945
 946 /**
 947  * {formatted_trait_docs}
 948  */
 949 export class {struct_name.replace("LDK","")} extends CommonBase {{
 950         /* @internal */
 951         public bindings_instance?: bindings.{struct_name};
 952
 953         /* @internal */
 954         constructor(_dummy: object, ptr: bigint) {{
 955                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
 956                 this.bindings_instance = null;
 957         }}
 958
 959         /** Creates a new instance of {struct_name.replace("LDK","")} from a given implementation */
 960         public static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 961                 const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 962                 let structImplementation = {{
 963 {out_interface_implementation_overrides}                }} as bindings.{struct_name};
 964 {super_constructor_statements}          const ptr: bigint = bindings.{struct_name}_new(structImplementation{bindings_instantiator});
 965
 966                 impl_holder.held = new {struct_name.replace("LDK", "")}(null, ptr);
 967                 impl_holder.held.bindings_instance = structImplementation;
 968 {pointer_to_adder}              return impl_holder.held;
 969         }}
 970
 971 """
 972         self.obj_defined([struct_name.replace("LDK", ""), struct_name.replace("LDK", "") + "Interface"], "structs")
 973
 974         out_typescript_bindings += "/* @internal */\nexport interface " + struct_name + " {\n"
 975         java_meths = []
 976         for fn_line in field_function_lines:
 977             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 978                 out_typescript_bindings += f"\t{fn_line.fn_name} ("
 979
 980                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 981                     if idx >= 1:
 982                         out_typescript_bindings = out_typescript_bindings + ", "
 983                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 984
 985                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 986
 987         out_typescript_bindings += "}\n\n"
 988
 989         out_typescript_bindings += f"/* @internal */\nexport function {struct_name}_new(impl: {struct_name}"
 990         for var in flattened_field_var_conversions:
 991             if isinstance(var, ConvInfo):
 992                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 993             else:
 994                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 995
 996         out_typescript_bindings += f"""): bigint {{
 997         if(!isWasmInitialized) {{
 998                 throw new Error("initializeWasm() must be awaited first!");
 999         }}
1000         var new_obj_idx = js_objs.length;
1001         for (var i = 0; i < js_objs.length; i++) {{
1002                 if (js_objs[i] == null || js_objs[i] == undefined) {{ new_obj_idx = i; break; }}
1003         }}
1004         js_objs[i] = new WeakRef(impl);
1005         return wasm.TS_{struct_name}_new(i);
1006 }}
1007 """
1008
1009         # Now that we've written out our java code (and created java_meths), generate C
1010         out_c = "typedef struct " + struct_name + "_JCalls {\n"
1011         out_c += "\tatomic_size_t refcnt;\n"
1012         out_c += "\tuint32_t instance_ptr;\n"
1013         for var in flattened_field_var_conversions:
1014             if isinstance(var, ConvInfo):
1015                 # We're a regular ol' field
1016                 pass
1017             else:
1018                 # We're a supertrait
1019                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
1020         out_c = out_c + "} " + struct_name + "_JCalls;\n"
1021
1022         for fn_line in field_function_lines:
1023             if fn_line.fn_name == "free":
1024                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
1025                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
1026                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
1027                 out_c = out_c + "\t\tFREE(j_calls);\n"
1028                 out_c = out_c + "\t}\n}\n"
1029
1030         for idx, fn_line in enumerate(field_function_lines):
1031             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
1032                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
1033                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
1034                 if fn_line.self_is_const:
1035                     out_c = out_c + "const void* this_arg"
1036                 else:
1037                     out_c = out_c + "void* this_arg"
1038
1039                 for idx, arg in enumerate(fn_line.args_ty):
1040                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
1041
1042                 out_c = out_c + ") {\n"
1043                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
1044
1045                 for arg_info in fn_line.args_ty:
1046                     if arg_info.ret_conv is not None:
1047                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
1048                         out_c = out_c + arg_info.arg_name
1049                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
1050
1051                 fn_suffix = ""
1052                 assert len(fn_line.args_ty) < 6
1053                 for arg_info in fn_line.args_ty:
1054                     if arg_info.c_ty == "uint64_t" or arg_info.c_ty == "int64_t":
1055                         fn_suffix += "b"
1056                     else:
1057                         fn_suffix += "u"
1058                 for i in range(0, 6 - len(fn_line.args_ty)):
1059                     fn_suffix += "u"
1060                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
1061                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (" + fn_line.ret_ty_info.c_ty + ")"
1062                     out_c += "js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1063                 elif fn_line.ret_ty_info.java_ty == "void":
1064                     out_c = out_c + "\tjs_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1065                 elif fn_line.ret_ty_info.java_hu_ty == "string":
1066                     out_c += "\tjstring ret = (jstring)js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1067                 elif not fn_line.ret_ty_info.passed_as_ptr:
1068                     out_c += "\treturn js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1069                 else:
1070                     out_c += "\tuint32_t ret = js_invoke_function_" + fn_suffix + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
1071
1072                 self.function_ptrs[self.function_ptr_counter] = (struct_name, fn_line.fn_name)
1073                 self.function_ptr_counter += 1
1074
1075                 for idx, arg_info in enumerate(fn_line.args_ty):
1076                     if arg_info.ret_conv is not None:
1077                         if arg_info.c_ty.endswith("Array"):
1078                             out_c += ", (uint32_t)" + arg_info.ret_conv_name
1079                         else:
1080                             out_c += ", " + arg_info.ret_conv_name
1081                     else:
1082                         assert False # TODO: Would we need some conversion here?
1083                         out_c += ", (uint32_t)" + arg_info.arg_name
1084                 for i in range(0, 6 - len(fn_line.args_ty)):
1085                     out_c += ", 0"
1086                 out_c = out_c + ");\n"
1087                 if fn_line.ret_ty_info.arg_conv is not None:
1088                     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"
1089
1090                 out_c = out_c + "}\n"
1091
1092         # Write out a clone function whether we need one or not, as we use them in moving to rust
1093         out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
1094         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
1095         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
1096         for var in field_var_conversions:
1097             if not isinstance(var, ConvInfo):
1098                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
1099         out_c = out_c + "}\n"
1100
1101         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (JSValue o"
1102         for var in flattened_field_var_conversions:
1103             if isinstance(var, ConvInfo):
1104                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
1105             else:
1106                 out_c = out_c + ", JSValue " + var[1]
1107         out_c = out_c + ") {\n"
1108
1109         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
1110         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
1111         out_c = out_c + "\tcalls->instance_ptr = o;\n"
1112
1113         for (fn_name, java_meth_descr) in java_meths:
1114             if fn_name != "free" and fn_name != "cloned":
1115                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
1116                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
1117
1118         for var in flattened_field_var_conversions:
1119             if isinstance(var, ConvInfo) and var.arg_conv is not None:
1120                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
1121         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
1122         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
1123         for fn_line in field_function_lines:
1124             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
1125                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
1126             elif fn_line.fn_name == "free":
1127                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
1128             else:
1129                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
1130         for var in field_var_conversions:
1131             if isinstance(var, ConvInfo):
1132                 if var.arg_conv_name is not None:
1133                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
1134                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
1135                 else:
1136                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
1137                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
1138             else:
1139                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(" + var[1]
1140                 for suparg in var[2]:
1141                     if isinstance(suparg, ConvInfo):
1142                         out_c += ", " + suparg.arg_name
1143                     else:
1144                         out_c += ", " + suparg[1]
1145                 out_c += "),\n"
1146         out_c = out_c + "\t};\n"
1147         for var in flattened_field_var_conversions:
1148             if not isinstance(var, ConvInfo):
1149                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
1150         out_c = out_c + "\treturn ret;\n"
1151         out_c = out_c + "}\n"
1152
1153         out_c = out_c + self.c_fn_ty_pfx + "uint64_t " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "JSValue o"
1154         for var in flattened_field_var_conversions:
1155             if isinstance(var, ConvInfo):
1156                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
1157             else:
1158                 out_c = out_c + ", JSValue " + var[1]
1159         out_c = out_c + ") {\n"
1160         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
1161         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(o"
1162         for var in flattened_field_var_conversions:
1163             if isinstance(var, ConvInfo):
1164                 out_c = out_c + ", " + var.arg_name
1165             else:
1166                 out_c = out_c + ", " + var[1]
1167         out_c = out_c + ");\n"
1168         out_c = out_c + "\treturn tag_ptr(res_ptr, true);\n"
1169         out_c = out_c + "}\n"
1170
1171         return (out_typescript_bindings, out_typescript_human, out_c)
1172
1173     def trait_struct_inc_refcnt(self, ty_info):
1174         base_conv = "\nif (" + ty_info.var_name + "_conv.free == " + ty_info.rust_obj + "_JCalls_free) {\n"
1175         base_conv = base_conv + "\t// If this_arg is a JCalls struct, then we need to increment the refcnt in it.\n"
1176         base_conv = base_conv + "\t" + ty_info.rust_obj + "_JCalls_cloned(&" + ty_info.var_name + "_conv);\n}"
1177         return base_conv
1178
1179     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
1180         bindings_type = struct_name.replace("LDK", "")
1181         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
1182
1183         out_java_enum = ""
1184         out_java = ""
1185         out_c = ""
1186
1187         out_java_enum += (self.hu_struct_file_prefix)
1188
1189         java_hu_class = "/**\n * " + enum_doc_comment.replace("\n", "\n * ") + "\n */\n"
1190         java_hu_class += "export class " + java_hu_type + " extends CommonBase {\n"
1191         java_hu_class += "\tprotected constructor(_dummy: object, ptr: bigint) { super(ptr, bindings." + bindings_type + "_free); }\n"
1192         java_hu_class += "\t/* @internal */\n"
1193         java_hu_class += f"\tpublic static constr_from_ptr(ptr: bigint): {java_hu_type} {{\n"
1194         java_hu_class += f"\t\tconst raw_ty: number = bindings." + struct_name + "_ty_from_ptr(ptr);\n"
1195         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"
1196         out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)untag_ptr(ptr);\n"
1197         out_c += "\tswitch(obj->tag) {\n"
1198         java_hu_class += "\t\tswitch (raw_ty) {\n"
1199         java_hu_subclasses = ""
1200
1201         out_java += "/* @internal */\nexport class " + struct_name + " {\n"
1202         out_java += "\tprotected constructor() {}\n"
1203         var_idx = 0
1204         for var in variant_list:
1205             java_hu_subclasses += "/** A " + java_hu_type + " of type " + var.var_name + " */\n"
1206             java_hu_subclasses += "export class " + java_hu_type + "_" + var.var_name + " extends " + java_hu_type + " {\n"
1207             java_hu_class += f"\t\t\tcase {var_idx}: "
1208             java_hu_class += "return new " + java_hu_type + "_" + var.var_name + "(ptr);\n"
1209             out_c += f"\t\tcase {struct_name}_{var.var_name}: return {var_idx};\n"
1210             hu_conv_body = ""
1211             for idx, (field_ty, field_docs) in enumerate(var.fields):
1212                 if field_docs is not None:
1213                     java_hu_subclasses += "\t/**\n\t * " + field_docs.replace("\n", "\n\t * ") + "\n\t */\n"
1214                 java_hu_subclasses += "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
1215                 if field_ty.to_hu_conv is not None:
1216                     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"
1217                     hu_conv_body += f"\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
1218                     hu_conv_body += f"\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
1219                 else:
1220                     hu_conv_body += f"\t\tthis.{field_ty.arg_name} = bindings.{struct_name}_{var.var_name}_get_{field_ty.arg_name}(ptr);\n"
1221             java_hu_subclasses += "\t/* @internal */\n"
1222             java_hu_subclasses += "\tpublic constructor(ptr: bigint) {\n\t\tsuper(null, ptr);\n"
1223             java_hu_subclasses = java_hu_subclasses + hu_conv_body
1224             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
1225             var_idx += 1
1226         out_java += "}\n"
1227         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"
1228         out_java += self.fn_call_body(struct_name + "_ty_from_ptr", "uint32_t", "number", "ptr: bigint", "ptr")
1229         out_c += ("\t\tdefault: abort();\n")
1230         out_c += ("\t}\n}\n")
1231
1232         for var in variant_list:
1233             for idx, (field_map, _) in enumerate(var.fields):
1234                 fn_name = f"{struct_name}_{var.var_name}_get_{field_map.arg_name}"
1235                 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"
1236                 out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)untag_ptr(ptr);\n"
1237                 out_c += f"\tassert(obj->tag == {struct_name}_{var.var_name});\n"
1238                 if field_map.ret_conv is not None:
1239                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
1240                     if var.tuple_variant:
1241                         out_c += "obj->" + camel_to_snake(var.var_name)
1242                     else:
1243                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
1244                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
1245                     out_c += "\treturn " + field_map.ret_conv_name + ";\n"
1246                 else:
1247                     if var.tuple_variant:
1248                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + ";\n"
1249                     else:
1250                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name + ";\n"
1251                 out_c += "}\n"
1252                 out_java += self.fn_call_body(fn_name, field_map.c_ty, field_map.java_ty, "ptr: bigint", "ptr")
1253         out_java_enum += java_hu_class
1254         self.struct_file_suffixes[java_hu_type] = java_hu_subclasses
1255         self.obj_defined([java_hu_type], "structs")
1256         return (out_java, out_java_enum, out_c)
1257
1258     def map_opaque_struct(self, struct_name, struct_doc_comment):
1259         implementations = ""
1260         method_header = ""
1261
1262         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
1263         out_opaque_struct_human = f"{self.hu_struct_file_prefix}"
1264         constructor_body = "super(ptr, bindings." + struct_name.replace("LDK","") + "_free);"
1265         extra_docs = ""
1266         extra_body = ""
1267         if struct_name.startswith("LDKLocked") or struct_name.startswith("LDKReadOnly"):
1268             extra_docs = "\n * This type represents a lock and MUST BE MANUALLY FREE'd!"
1269             constructor_body = 'super(ptr, () => { throw new Error("Locks must be manually freed with free()"); });'
1270             extra_body = f"""
1271         /** Releases this lock */
1272         public free() {{
1273                 bindings.{struct_name.replace("LDK","")}_free(this.ptr);
1274                 CommonBase.set_null_skip_free(this);
1275         }}"""
1276         formatted_doc_comment = struct_doc_comment.replace("\n", "\n * ")
1277         out_opaque_struct_human += f"""
1278 /**{extra_docs}
1279  * {formatted_doc_comment}
1280  */
1281 export class {hu_name} extends CommonBase {implementations}{{
1282         /* @internal */
1283         public constructor(_dummy: object, ptr: bigint) {{
1284                 {constructor_body}
1285         }}{extra_body}
1286
1287 """
1288         self.obj_defined([hu_name], "structs")
1289         return out_opaque_struct_human
1290
1291     def map_tuple(self, struct_name):
1292         return self.map_opaque_struct(struct_name, "A Tuple")
1293
1294     def map_result(self, struct_name, res_map, err_map):
1295         human_ty = struct_name.replace("LDKCResult", "Result")
1296
1297         suffixes = f"export class {human_ty}_OK extends {human_ty} {{\n"
1298         if res_map.java_hu_ty != "void":
1299             suffixes += "\tpublic res: " + res_map.java_hu_ty + ";\n"
1300         suffixes += f"""
1301         /* @internal */
1302         public constructor(_dummy: object, ptr: bigint) {{
1303                 super(_dummy, ptr);
1304 """
1305         if res_map.java_hu_ty == "void":
1306             pass
1307         elif res_map.to_hu_conv is not None:
1308             suffixes += "\t\tconst res: " + res_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1309             suffixes += "\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t")
1310             suffixes += "\n\t\tthis.res = " + res_map.to_hu_conv_name + ";\n"
1311         else:
1312             suffixes += "\t\tthis.res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1313         suffixes += "\t}\n}\n"
1314
1315         suffixes += f"export class {human_ty}_Err extends {human_ty} {{\n"
1316         if err_map.java_hu_ty != "void":
1317             suffixes += "\tpublic err: " + err_map.java_hu_ty + ";\n"
1318         suffixes += f"""
1319         /* @internal */
1320         public constructor(_dummy: object, ptr: bigint) {{
1321                 super(_dummy, ptr);
1322 """
1323         if err_map.java_hu_ty == "void":
1324             pass
1325         elif err_map.to_hu_conv is not None:
1326             suffixes += "\t\tconst err: " + err_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1327             suffixes += "\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t")
1328             suffixes += "\n\t\tthis.err = " + err_map.to_hu_conv_name + ";\n"
1329         else:
1330             suffixes += "\t\tthis.err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1331         suffixes += "\t}\n}"
1332
1333         self.struct_file_suffixes[human_ty] = suffixes
1334         self.obj_defined([human_ty], "structs")
1335
1336         return f"""{self.hu_struct_file_prefix}
1337
1338 export class {human_ty} extends CommonBase {{
1339         protected constructor(_dummy: object, ptr: bigint) {{
1340                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1341         }}
1342         /* @internal */
1343         public static constr_from_ptr(ptr: bigint): {human_ty} {{
1344                 if (bindings.{struct_name.replace("LDK", "")}_is_ok(ptr)) {{
1345                         return new {human_ty}_OK(null, ptr);
1346                 }} else {{
1347                         return new {human_ty}_Err(null, ptr);
1348                 }}
1349         }}
1350 """
1351
1352     def fn_call_body(self, method_name, return_c_ty, return_java_ty, method_argument_string, native_call_argument_string):
1353         has_return_value = return_c_ty != 'void'
1354         return_statement = 'return nativeResponseValue;'
1355         if not has_return_value:
1356             return_statement = '// debug statements here'
1357
1358         return f"""/* @internal */
1359 export function {method_name}({method_argument_string}): {return_java_ty} {{
1360         if(!isWasmInitialized) {{
1361                 throw new Error("initializeWasm() must be awaited first!");
1362         }}
1363         const nativeResponseValue = wasm.TS_{method_name}({native_call_argument_string});
1364         {return_statement}
1365 }}
1366 """
1367     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):
1368         out_java = ""
1369         out_c = ""
1370         out_java_struct = None
1371
1372         out_java += ("\t")
1373         out_c += (self.c_fn_ty_pfx)
1374         out_c += (return_type_info.c_ty)
1375         out_java += (return_type_info.java_ty)
1376         if return_type_info.ret_conv is not None:
1377             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1378         out_java += (" " + method_name + "(")
1379         out_c += (" "  + self.c_fn_name_define_pfx(method_name, True))
1380
1381         method_argument_string = ""
1382         native_call_argument_string = ""
1383         for idx, arg_conv_info in enumerate(argument_types):
1384             if idx != 0:
1385                 method_argument_string += (", ")
1386                 native_call_argument_string += ', '
1387                 out_c += (", ")
1388             if arg_conv_info.c_ty != "void":
1389                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1390                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
1391                 native_call_argument_string += arg_conv_info.arg_name
1392         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)
1393
1394         out_java_struct = ""
1395         if doc_comment is not None:
1396             out_java_struct = "\t/**\n\t * " + doc_comment.replace("\n", "\n\t * ") + "\n\t */\n"
1397
1398         if not args_known:
1399             out_java_struct += ("\t// Skipped " + method_name + "\n")
1400         else:
1401             if not takes_self:
1402                 out_java_struct += (
1403                         "\tpublic static constructor_" + meth_n + "(")
1404             else:
1405                 out_java_struct += ("\tpublic " + meth_n + "(")
1406             for idx, arg in enumerate(argument_types):
1407                 if idx != 0:
1408                     if not takes_self or idx > 1:
1409                         out_java_struct += (", ")
1410                 elif takes_self:
1411                     continue
1412                 if arg.java_ty != "void":
1413                     if arg.arg_name in default_constructor_args:
1414                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1415                             if explode_idx != 0:
1416                                 out_java_struct += (", ")
1417                             out_java_struct += arg.arg_name + "_" + explode_arg.arg_name + ": " + explode_arg.java_hu_ty
1418                     else:
1419                         out_java_struct += arg.arg_name + ": " + arg.java_hu_ty
1420
1421         out_c += (") {\n")
1422         if out_java_struct is not None:
1423             out_java_struct += "): " + return_type_info.java_hu_ty + " {\n"
1424         for info in argument_types:
1425             if info.arg_conv is not None:
1426                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1427         if return_type_info.ret_conv is not None:
1428             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1429         elif return_type_info.c_ty != "void":
1430             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1431         else:
1432             out_c += ("\t")
1433         if c_call_string is None:
1434             out_c += (method_name + "(")
1435         else:
1436             out_c += (c_call_string)
1437         for idx, info in enumerate(argument_types):
1438             if info.arg_conv_name is not None:
1439                 if idx != 0:
1440                     out_c += (", ")
1441                 elif c_call_string is not None:
1442                     continue
1443                 out_c += (info.arg_conv_name)
1444         out_c += (")")
1445         if return_type_info.ret_conv is not None:
1446             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1447         else:
1448             out_c += (";")
1449         for info in argument_types:
1450             if info.arg_conv_cleanup is not None:
1451                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1452         if return_type_info.ret_conv is not None:
1453             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1454         elif return_type_info.c_ty != "void":
1455             out_c += ("\n\treturn ret_val;")
1456         out_c += ("\n}\n\n")
1457
1458         if args_known:
1459             out_java_struct += ("\t\t")
1460             if return_type_info.java_ty != "void":
1461                 out_java_struct += "const ret: " + return_type_info.java_ty + " = "
1462             out_java_struct += ("bindings." + method_name + "(")
1463             for idx, info in enumerate(argument_types):
1464                 if idx != 0:
1465                     out_java_struct += (", ")
1466                 if idx == 0 and takes_self:
1467                     out_java_struct += ("this.ptr")
1468                 elif info.arg_name in default_constructor_args:
1469                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1470                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1471                         if explode_idx != 0:
1472                             out_java_struct += (", ")
1473                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1474                         if explode_arg.from_hu_conv is not None:
1475                             out_java_struct += (
1476                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1477                         else:
1478                             out_java_struct += (expl_arg_name)
1479                     out_java_struct += (")")
1480                 elif info.from_hu_conv is not None:
1481                     out_java_struct += (info.from_hu_conv[0])
1482                 else:
1483                     out_java_struct += (info.arg_name)
1484             out_java_struct += (");\n")
1485             if return_type_info.to_hu_conv is not None:
1486                 if not takes_self:
1487                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1488                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1489                 else:
1490                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1491
1492             for idx, info in enumerate(argument_types):
1493                 if idx == 0 and takes_self:
1494                     pass
1495                 elif info.arg_name in default_constructor_args:
1496                     for explode_arg in default_constructor_args[info.arg_name]:
1497                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1498                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1499                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1500                                                                                              expl_arg_name).replace(
1501                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1502                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1503                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1504                         out_java_struct += (
1505                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1506                     else:
1507                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1508
1509             if return_type_info.to_hu_conv_name is not None:
1510                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1511             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1512                 out_java_struct += ("\t\treturn ret;\n")
1513             out_java_struct += ("\t}\n\n")
1514
1515         return (out_java, out_c, out_java_struct)
1516
1517     def cleanup(self):
1518         for struct in self.struct_file_suffixes:
1519             with open(self.outdir + "/structs/" + struct + self.file_ext, "a") as src:
1520                 src.write(self.struct_file_suffixes[struct])
1521
1522         with open(self.outdir + "/bindings.mts", "a") as bindings:
1523             bindings.write("""
1524
1525 js_invoke = function(obj_ptr: number, fn_id: number, arg1: bigint|number, arg2: bigint|number, arg3: bigint|number, arg4: bigint|number, arg5: bigint|number, arg6: bigint|number, arg7: bigint|number, arg8: bigint|number, arg9: bigint|number, arg10: bigint|number) {
1526         const weak: WeakRef<object> = js_objs[obj_ptr];
1527         if (weak == null || weak == undefined) {
1528                 console.error("Got function call on unknown/free'd JS object!");
1529                 throw new Error("Got function call on unknown/free'd JS object!");
1530         }
1531         const obj: object = weak.deref();
1532         if (obj == null || obj == undefined) {
1533                 console.error("Got function call on GC'd JS object!");
1534                 throw new Error("Got function call on GC'd JS object!");
1535         }
1536         var fn;
1537 """)
1538             bindings.write("\tswitch (fn_id) {\n")
1539             for f in self.function_ptrs:
1540                 bindings.write(f"\t\tcase {str(f)}: fn = Object.getOwnPropertyDescriptor(obj, \"{self.function_ptrs[f][1]}\"); break;\n")
1541
1542             bindings.write("""\t\tdefault:
1543                         console.error("Got unknown function call from C!");
1544                         throw new Error("Got unknown function call from C!");
1545         }
1546         if (fn == null || fn == undefined) {
1547                 console.error("Got function call on incorrect JS object!");
1548                 throw new Error("Got function call on incorrect JS object!");
1549         }
1550         const ret = fn.value.bind(obj)(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10);
1551         if (ret === undefined || ret === null) return BigInt(0);
1552         return BigInt(ret);
1553 }""")