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

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