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