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