_ 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', 'Uint8Array'],
  21             uint16_t = ['number', 'Uint16Array'],
  22             uint32_t = ['number', 'Uint32Array'],
  23             uint64_t = ['BigInt'],
  24         )
  25
  26         self.wasm_decoding_map = dict(
  27             int8_tArray = 'decodeUint8Array'
  28         )
  29
  30         self.wasm_encoding_map = dict(
  31             int8_tArray = 'encodeUint8Array',
  32         )
  33
  34         self.to_hu_conv_templates = dict(
  35             ptr = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  36             default = 'const {var_name}_hu_conv: {human_type} = new {human_type}(null, {var_name});',
  37         )
  38
  39         self.bindings_header = self.wasm_import_header(target)
  40
  41         self.bindings_version_file = ""
  42
  43         self.bindings_footer = ""
  44
  45         self.common_base = """
  46 function freer(f: () => void) { f() }
  47 const finalizer = new FinalizationRegistry(freer);
  48 function get_freeer(ptr: number, free_fn: (ptr: number) => void) {
  49         return () => {
  50                 free_fn(ptr);
  51         }
  52 }
  53
  54 export default class CommonBase {
  55         protected ptr: number;
  56         protected ptrs_to: object[] = [];
  57         protected constructor(ptr: number, free_fn: (ptr: number) => void) {
  58                 this.ptr = ptr;
  59                 if (Number.isFinite(ptr) && ptr != 0){
  60                         finalizer.register(this, get_freeer(ptr, free_fn));
  61                 }
  62         }
  63         // In Java, protected means "any subclass can access fields on any other subclass'"
  64         // In TypeScript, protected means "any subclass can access parent fields on instances of itself"
  65         // To work around this, we add accessors for other instances' protected fields here.
  66         protected static add_ref_from(holder: CommonBase, referent: object) {
  67                 holder.ptrs_to.push(referent);
  68         }
  69         protected static get_ptr_of(o: CommonBase) {
  70                 return o.ptr;
  71         }
  72         protected static set_null_skip_free(o: CommonBase) {
  73                 o.ptr = 0;
  74                 finalizer.unregister(o);
  75         }
  76 }
  77 """
  78
  79         self.txout_defn = """export class TxOut extends CommonBase {
  80         /** The script_pubkey in this output */
  81         public script_pubkey: Uint8Array;
  82         /** The value, in satoshis, of this output */
  83         public value: BigInt;
  84
  85         /* @internal */
  86         public constructor(_dummy: object, ptr: number) {
  87                 super(ptr, bindings.TxOut_free);
  88                 this.script_pubkey = bindings.TxOut_get_script_pubkey(ptr);
  89                 this.value = bindings.TxOut_get_value(ptr);
  90         }
  91         public constructor_new(value: BigInt, script_pubkey: Uint8Array): TxOut {
  92                 return new TxOut(null, bindings.TxOut_new(script_pubkey, value));
  93         }
  94 }"""
  95         self.obj_defined(["TxOut"], "structs")
  96
  97         self.c_file_pfx = """#include "js-wasm.h"
  98 #include <stdatomic.h>
  99 #include <lightning.h>
 100
 101 // These should be provided...somehow...
 102 void *memset(void *s, int c, size_t n);
 103 void *memcpy(void *dest, const void *src, size_t n);
 104 int memcmp(const void *s1, const void *s2, size_t n);
 105
 106 void __attribute__((noreturn)) abort(void);
 107 static inline void assert(bool expression) {
 108         if (!expression) { abort(); }
 109 }
 110
 111 uint32_t __attribute__((visibility("default"))) test_bigint_pass_deadbeef0badf00d(uint64_t val) {
 112         return val == 0xdeadbeef0badf00dULL;
 113 }
 114
 115 """
 116
 117         if not DEBUG:
 118             self.c_file_pfx = self.c_file_pfx + """
 119 void *malloc(size_t size);
 120 void free(void *ptr);
 121
 122 #define MALLOC(a, _) malloc(a)
 123 #define FREE(p) if ((unsigned long)(p) > 4096) { free(p); }
 124 #define DO_ASSERT(a) (void)(a)
 125 #define CHECK(a)
 126 #define CHECK_ACCESS(p)
 127 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v)
 128 """
 129         else:
 130             self.c_file_pfx = self.c_file_pfx + """
 131 // Always run a, then assert it is true:
 132 #define DO_ASSERT(a) do { bool _assert_val = (a); assert(_assert_val); } while(0)
 133 // Assert a is true or do nothing
 134 #define CHECK(a) DO_ASSERT(a)
 135
 136 // Running a leak check across all the allocations and frees of the JDK is a mess,
 137 // so instead we implement our own naive leak checker here, relying on the -wrap
 138 // linker option to wrap malloc/calloc/realloc/free, tracking everyhing allocated
 139 // and free'd in Rust or C across the generated bindings shared library.
 140
 141 #define BT_MAX 128
 142 typedef struct allocation {
 143         struct allocation* next;
 144         void* ptr;
 145         const char* struct_name;
 146 } allocation;
 147 static allocation* allocation_ll = NULL;
 148
 149 void* __real_malloc(size_t len);
 150 void* __real_calloc(size_t nmemb, size_t len);
 151 static void new_allocation(void* res, const char* struct_name) {
 152         allocation* new_alloc = __real_malloc(sizeof(allocation));
 153         new_alloc->ptr = res;
 154         new_alloc->struct_name = struct_name;
 155         new_alloc->next = allocation_ll;
 156         allocation_ll = new_alloc;
 157 }
 158 static void* MALLOC(size_t len, const char* struct_name) {
 159         void* res = __real_malloc(len);
 160         new_allocation(res, struct_name);
 161         return res;
 162 }
 163 void __real_free(void* ptr);
 164 static void alloc_freed(void* ptr) {
 165         allocation* p = NULL;
 166         allocation* it = allocation_ll;
 167         while (it->ptr != ptr) {
 168                 p = it; it = it->next;
 169                 if (it == NULL) {
 170                         //XXX: fprintf(stderr, "Tried to free unknown pointer %p\\n", ptr);
 171                         return; // addrsan should catch malloc-unknown and print more info than we have
 172                 }
 173         }
 174         if (p) { p->next = it->next; } else { allocation_ll = it->next; }
 175         DO_ASSERT(it->ptr == ptr);
 176         __real_free(it);
 177 }
 178 static void FREE(void* ptr) {
 179         if ((unsigned long)ptr <= 4096) return; // Rust loves to create pointers to the NULL page for dummys
 180         alloc_freed(ptr);
 181         __real_free(ptr);
 182 }
 183
 184 static void CHECK_ACCESS(const void* ptr) {
 185         allocation* it = allocation_ll;
 186         while (it->ptr != ptr) {
 187                 it = it->next;
 188                 if (it == NULL) {
 189                         return; // addrsan should catch malloc-unknown and print more info than we have
 190                 }
 191         }
 192 }
 193 #define CHECK_INNER_FIELD_ACCESS_OR_NULL(v) \\
 194         if (v.is_owned && v.inner != NULL) { \\
 195                 const void *p = __unmangle_inner_ptr(v.inner); \\
 196                 if (p != NULL) { \\
 197                         CHECK_ACCESS(p); \\
 198                 } \\
 199         }
 200
 201 void* __wrap_malloc(size_t len) {
 202         void* res = __real_malloc(len);
 203         new_allocation(res, "malloc call");
 204         return res;
 205 }
 206 void* __wrap_calloc(size_t nmemb, size_t len) {
 207         void* res = __real_calloc(nmemb, len);
 208         new_allocation(res, "calloc call");
 209         return res;
 210 }
 211 void __wrap_free(void* ptr) {
 212         if (ptr == NULL) return;
 213         alloc_freed(ptr);
 214         __real_free(ptr);
 215 }
 216
 217 void* __real_realloc(void* ptr, size_t newlen);
 218 void* __wrap_realloc(void* ptr, size_t len) {
 219         if (ptr != NULL) alloc_freed(ptr);
 220         void* res = __real_realloc(ptr, len);
 221         new_allocation(res, "realloc call");
 222         return res;
 223 }
 224 void __wrap_reallocarray(void* ptr, size_t new_sz) {
 225         // Rust doesn't seem to use reallocarray currently
 226         DO_ASSERT(false);
 227 }
 228
 229 void __attribute__((destructor)) check_leaks() {
 230         for (allocation* a = allocation_ll; a != NULL; a = a->next) {
 231                 //XXX: fprintf(stderr, "%s %p remains\\n", a->struct_name, a->ptr);
 232         }
 233         DO_ASSERT(allocation_ll == NULL);
 234 }
 235 """
 236         self.c_file_pfx = self.c_file_pfx + """
 237 // We assume that CVec_u8Z and u8slice are the same size and layout (and thus pointers to the two can be mixed)
 238 _Static_assert(sizeof(LDKCVec_u8Z) == sizeof(LDKu8slice), "Vec<u8> and [u8] need to have been mapped identically");
 239 _Static_assert(offsetof(LDKCVec_u8Z, data) == offsetof(LDKu8slice, data), "Vec<u8> and [u8] need to have been mapped identically");
 240 _Static_assert(offsetof(LDKCVec_u8Z, datalen) == offsetof(LDKu8slice, datalen), "Vec<u8> and [u8] need to have been mapped identically");
 241
 242 _Static_assert(sizeof(void*) == 4, "Pointers mut be 32 bits");
 243
 244 #define DECL_ARR_TYPE(ty, name) \\
 245         struct name##array { \\
 246                 uint32_t arr_len; \\
 247                 ty elems[]; \\
 248         }; \\
 249         typedef struct name##array * name##Array; \\
 250         static inline name##Array init_##name##Array(size_t arr_len) { \\
 251                 name##Array arr = (name##Array)MALLOC(arr_len * sizeof(ty) + sizeof(uint32_t), "##name array init"); \\
 252                 arr->arr_len = arr_len; \\
 253                 return arr; \\
 254         }
 255
 256 DECL_ARR_TYPE(int64_t, int64_t);
 257 DECL_ARR_TYPE(int8_t, int8_t);
 258 DECL_ARR_TYPE(uint32_t, uint32_t);
 259 DECL_ARR_TYPE(void*, ptr);
 260 DECL_ARR_TYPE(char, char);
 261 typedef charArray jstring;
 262
 263 static inline jstring str_ref_to_ts(const char* chars, size_t len) {
 264         charArray arr = init_charArray(len);
 265         memcpy(arr->elems, chars, len);
 266         return arr;
 267 }
 268 static inline LDKStr str_ref_to_owned_c(const jstring str) {
 269         char* newchars = MALLOC(str->arr_len + 1, "String chars");
 270         memcpy(newchars, str->elems, str->arr_len);
 271         newchars[str->arr_len] = 0;
 272         LDKStr res = {
 273                 .chars = newchars,
 274                 .len = str->arr_len,
 275                 .chars_is_owned = true
 276         };
 277         return res;
 278 }
 279
 280 typedef bool jboolean;
 281
 282 uint32_t __attribute__((visibility("default"))) TS_malloc(uint32_t size) {
 283         return (uint32_t)MALLOC(size, "JS-Called malloc");
 284 }
 285 void __attribute__((visibility("default"))) TS_free(uint32_t ptr) {
 286         FREE((void*)ptr);
 287 }
 288 """
 289
 290         self.c_version_file = ""
 291
 292         self.hu_struct_file_prefix = """
 293 import CommonBase from './CommonBase.mjs';
 294 import * as bindings from '../bindings.mjs'
 295 import * as InternalUtils from '../InternalUtils.mjs'
 296
 297 """
 298         self.util_fn_pfx = self.hu_struct_file_prefix + "\nexport class UtilMethods extends CommonBase {\n"
 299         self.util_fn_sfx = "}"
 300         self.c_fn_ty_pfx = ""
 301         self.file_ext = ".mts"
 302         self.ptr_c_ty = "uint32_t"
 303         self.ptr_native_ty = "number"
 304         self.result_c_ty = "uint32_t"
 305         self.ptr_arr = "ptrArray"
 306         self.is_arr_some_check = ("", " != 0")
 307         self.get_native_arr_len_call = ("", "->arr_len")
 308
 309         with open(outdir + "/InternalUtils.mts", "w") as f:
 310             f.write("export function check_arr_len(arr: Uint8Array, len: number): Uint8Array {\n")
 311             f.write("\tif (arr.length != len) { throw new Error(\"Expected array of length \" + len + \"got \" + arr.length); }\n")
 312             f.write("\treturn arr;\n")
 313             f.write("}")
 314
 315     def release_native_arr_ptr_call(self, ty_info, arr_var, arr_ptr_var):
 316         return None
 317     def create_native_arr_call(self, arr_len, ty_info):
 318         if ty_info.c_ty == "ptrArray":
 319             assert ty_info.subty is not None and ty_info.subty.c_ty.endswith("Array")
 320         return "init_" + ty_info.c_ty + "(" + arr_len + ")"
 321     def set_native_arr_contents(self, arr_name, arr_len, ty_info):
 322         if ty_info.c_ty == "int8_tArray":
 323             return ("memcpy(" + arr_name + "->elems, ", ", " + arr_len + ")")
 324         else:
 325             assert False
 326     def get_native_arr_contents(self, arr_name, dest_name, arr_len, ty_info, copy):
 327         if ty_info.c_ty == "int8_tArray":
 328             if copy:
 329                 return "memcpy(" + dest_name + ", " + arr_name + "->elems, " + arr_len + ")"
 330         if ty_info.c_ty == "ptrArray":
 331             return "(void*) " + arr_name + "->elems"
 332         else:
 333             assert not copy
 334             return arr_name + "->elems"
 335     def get_native_arr_elem(self, arr_name, idxc, ty_info):
 336         assert False # Only called if above is None
 337     def get_native_arr_ptr_call(self, ty_info):
 338         if ty_info.subty is not None:
 339             return "(" + ty_info.subty.c_ty + "*)(", " + 4)"
 340         return "(" + ty_info.c_ty + "*)(", " + 4)"
 341     def get_native_arr_entry_call(self, ty_info, arr_name, idxc, entry_access):
 342         return None
 343     def cleanup_native_arr_ref_contents(self, arr_name, dest_name, arr_len, ty_info):
 344         if ty_info.c_ty == "int8_tArray":
 345             return None
 346         else:
 347             return None
 348
 349     def map_hu_array_elems(self, arr_name, conv_name, arr_ty, elem_ty):
 350         return arr_name + " != null ? " + arr_name + ".map(" + conv_name + " => " + elem_ty.from_hu_conv[0] + ") : null"
 351
 352     def str_ref_to_native_call(self, var_name, str_len):
 353         return "str_ref_to_ts(" + var_name + ", " + str_len + ")"
 354     def str_ref_to_c_call(self, var_name):
 355         return "str_ref_to_owned_c(" + var_name + ")"
 356
 357     def c_fn_name_define_pfx(self, fn_name, have_args):
 358         return " __attribute__((visibility(\"default\"))) TS_" + fn_name + "("
 359
 360     def wasm_import_header(self, target):
 361         res = """
 362 const imports: any = {};
 363 imports.env = {};
 364
 365 var js_objs: Array<WeakRef<object>> = [];
 366 var js_invoke: Function;
 367 imports.env["abort"] = function () {
 368         console.error("ABORT");
 369 };
 370
 371 imports.wasi_snapshot_preview1 = {
 372         "fd_write" : () => {
 373                 console.log("ABORT");
 374         },
 375         "random_get" : () => {
 376                 console.log("RAND GET");
 377         },
 378         "environ_sizes_get" : () => {
 379                 console.log("wasi_snapshot_preview1:environ_sizes_get");
 380         },
 381         "proc_exit" : () => {
 382                 console.log("wasi_snapshot_preview1:proc_exit");
 383         },
 384         "environ_get" : () => {
 385                 console.log("wasi_snapshot_preview1:environ_get");
 386         },
 387 };
 388
 389 var wasm: any = null;
 390 let isWasmInitialized: boolean = false;
 391 """
 392
 393         if target == Target.NODEJS:
 394             res += """import * as fs from 'fs';
 395 export async function initializeWasm(path: string) {
 396         const source = fs.readFileSync(path);
 397         imports.env["js_invoke_function"] = js_invoke;
 398         const { instance: wasmInstance } = await WebAssembly.instantiate(source, imports);
 399         wasm = wasmInstance.exports;
 400         if (!wasm.test_bigint_pass_deadbeef0badf00d(BigInt("0xdeadbeef0badf00d"))) {
 401                 throw new Error(\"Currently need BigInt-as-u64 support, try ----experimental-wasm-bigint");
 402         }
 403         isWasmInitialized = true;
 404 };
 405 """
 406         else:
 407             res += """
 408 export async function initializeWasm(uri: string) {
 409         const stream = fetch(uri);
 410         imports.env["js_invoke_function"] = js_invoke;
 411         const { instance: wasmInstance } = await WebAssembly.instantiateStreaming(stream, imports);
 412         wasm = wasmInstance.exports;
 413         if (!wasm.test_bigint_pass_deadbeef0badf00d(BigInt("0xdeadbeef0badf00d"))) {
 414                 throw new Error(\"Currently need BigInt-as-u64 support, try ----experimental-wasm-bigint");
 415         }
 416         isWasmInitialized = true;
 417 };
 418
 419 """
 420
 421         return res + """
 422
 423
 424 // WASM CODEC
 425
 426 const nextMultipleOfFour = (value: number) => {
 427         return Math.ceil(value / 4) * 4;
 428 }
 429
 430 const encodeUint8Array = (inputArray: Uint8Array) => {
 431         const cArrayPointer = wasm.TS_malloc(inputArray.length + 4);
 432         const arrayLengthView = new Uint32Array(wasm.memory.buffer, cArrayPointer, 1);
 433         arrayLengthView[0] = inputArray.length;
 434         const arrayMemoryView = new Uint8Array(wasm.memory.buffer, cArrayPointer + 4, inputArray.length);
 435         arrayMemoryView.set(inputArray);
 436         return cArrayPointer;
 437 }
 438
 439 const encodeUint32Array = (inputArray: Uint32Array) => {
 440         const cArrayPointer = wasm.TS_malloc((inputArray.length + 1) * 4);
 441         const arrayMemoryView = new Uint32Array(wasm.memory.buffer, cArrayPointer, inputArray.length);
 442         arrayMemoryView.set(inputArray, 1);
 443         arrayMemoryView[0] = inputArray.length;
 444         return cArrayPointer;
 445 }
 446
 447 const getArrayLength = (arrayPointer: number) => {
 448         const arraySizeViewer = new Uint32Array(
 449                 wasm.memory.buffer, // value
 450                 arrayPointer, // offset
 451                 1 // one int
 452         );
 453         return arraySizeViewer[0];
 454 }
 455 const decodeUint8Array = (arrayPointer: number, free = true) => {
 456         const arraySize = getArrayLength(arrayPointer);
 457         const actualArrayViewer = new Uint8Array(
 458                 wasm.memory.buffer, // value
 459                 arrayPointer + 4, // offset (ignoring length bytes)
 460                 arraySize // uint8 count
 461         );
 462         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 463         // will free the underlying memory when it becomes unreachable instead of copying here.
 464         const actualArray = actualArrayViewer.slice(0, arraySize);
 465         if (free) {
 466                 wasm.TS_free(arrayPointer);
 467         }
 468         return actualArray;
 469 }
 470 const decodeUint32Array = (arrayPointer: number, free = true) => {
 471         const arraySize = getArrayLength(arrayPointer);
 472         const actualArrayViewer = new Uint32Array(
 473                 wasm.memory.buffer, // value
 474                 arrayPointer + 4, // offset (ignoring length bytes)
 475                 arraySize // uint32 count
 476         );
 477         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 478         // will free the underlying memory when it becomes unreachable instead of copying here.
 479         const actualArray = actualArrayViewer.slice(0, arraySize);
 480         if (free) {
 481                 wasm.TS_free(arrayPointer);
 482         }
 483         return actualArray;
 484 }
 485
 486 const encodeString = (string: string) => {
 487         // make malloc count divisible by 4
 488         const memoryNeed = nextMultipleOfFour(string.length + 1);
 489         const stringPointer = wasm.TS_malloc(memoryNeed);
 490         const stringMemoryView = new Uint8Array(
 491                 wasm.memory.buffer, // value
 492                 stringPointer, // offset
 493                 string.length + 1 // length
 494         );
 495         for (let i = 0; i < string.length; i++) {
 496                 stringMemoryView[i] = string.charCodeAt(i);
 497         }
 498         stringMemoryView[string.length] = 0;
 499         return stringPointer;
 500 }
 501
 502 const decodeString = (stringPointer: number, free = true) => {
 503         const memoryView = new Uint8Array(wasm.memory.buffer, stringPointer);
 504         let cursor = 0;
 505         let result = '';
 506
 507         while (memoryView[cursor] !== 0) {
 508                 result += String.fromCharCode(memoryView[cursor]);
 509                 cursor++;
 510         }
 511
 512         if (free) {
 513                 wasm.wasm_free(stringPointer);
 514         }
 515
 516         return result;
 517 };
 518 """
 519
 520     def init_str(self):
 521         return ""
 522
 523     def constr_hu_array(self, ty_info, arr_len):
 524         return "new Array(" + arr_len + ").fill(null)"
 525
 526     def var_decl_statement(self, ty_string, var_name, statement):
 527         return "const " + var_name + ": " + ty_string + " = " + statement
 528
 529     def for_n_in_range(self, n, minimum, maximum):
 530         return "for (var " + n + " = " + minimum + "; " + n + " < " + maximum + "; " + n + "++) {"
 531     def for_n_in_arr(self, n, arr_name, arr_elem_ty):
 532         return (arr_name + ".forEach((" + n + ": " + arr_elem_ty.java_hu_ty + ") => { ", " })")
 533
 534     def get_ptr(self, var):
 535         return "CommonBase.get_ptr_of(" + var + ")"
 536     def set_null_skip_free(self, var):
 537         return "CommonBase.set_null_skip_free(" + var + ");"
 538
 539     def add_ref(self, holder, referent):
 540         return "CommonBase.add_ref_from(" + holder + ", " + referent + ")"
 541
 542     def obj_defined(self, struct_names, folder):
 543         with open(self.outdir + "/index.mts", 'a') as index:
 544             index.write(f"export * from './{folder}/{struct_names[0]}.mjs';\n")
 545         with open(self.outdir + "/imports.mts.part", 'a') as imports:
 546             imports.write(f"import {{ {', '.join(struct_names)} }} from '../{folder}/{struct_names[0]}.mjs';\n")
 547
 548     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 549         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_js(int32_t ord) {\n"
 550         out_c = out_c + "\tswitch (ord) {\n"
 551         ord_v = 0
 552
 553         out_typescript_enum_fields = ""
 554
 555         for var, var_docs in variants:
 556             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 557             ord_v = ord_v + 1
 558             if var_docs is not None:
 559                 out_typescript_enum_fields += f"/**\n * {var_docs}\n */\n"
 560             out_typescript_enum_fields += f"{var},\n\t\t\t\t"
 561         out_c = out_c + "\t}\n"
 562         out_c = out_c + "\tabort();\n"
 563         out_c = out_c + "}\n"
 564
 565         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_js(LDK" + struct_name + " val) {\n"
 566         out_c = out_c + "\tswitch (val) {\n"
 567         ord_v = 0
 568         for var, _ in variants:
 569             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 570             ord_v = ord_v + 1
 571         out_c = out_c + "\t\tdefault: abort();\n"
 572         out_c = out_c + "\t}\n"
 573         out_c = out_c + "}\n"
 574
 575         out_typescript = f"""
 576             export enum {struct_name} {{
 577                 {out_typescript_enum_fields}
 578             }}
 579 """
 580         out_typescript_enum = f"export {{ {struct_name} }} from \"../bindings.mjs\";"
 581         self.obj_defined([struct_name], "enums")
 582         return (out_c, out_typescript_enum, out_typescript)
 583
 584     def c_unitary_enum_to_native_call(self, ty_info):
 585         return (ty_info.rust_obj + "_to_js(", ")")
 586     def native_unitary_enum_to_c_call(self, ty_info):
 587         return (ty_info.rust_obj + "_from_js(", ")")
 588
 589     def c_complex_enum_pass_ty(self, struct_name):
 590         return "uint32_t"
 591
 592     def c_constr_native_complex_enum(self, struct_name, variant, c_params):
 593         ret = "0 /* " + struct_name + " - " + variant + " */"
 594         for param in c_params:
 595             ret = ret + "; (void) " + param
 596         return ret
 597
 598     def native_c_map_trait(self, struct_name, field_var_conversions, flattened_field_var_conversions, field_function_lines, trait_doc_comment):
 599         out_typescript_bindings = "\n\n\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: START\n\n"
 600
 601         super_instantiator = ""
 602         bindings_instantiator = ""
 603         pointer_to_adder = ""
 604         impl_constructor_arguments = ""
 605         for var in flattened_field_var_conversions:
 606             if isinstance(var, ConvInfo):
 607                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 608                 super_instantiator += first_to_lower(var.arg_name) + ", "
 609                 if var.from_hu_conv is not None:
 610                     bindings_instantiator += ", " + var.from_hu_conv[0]
 611                     if var.from_hu_conv[1] != "":
 612                         pointer_to_adder += "\t\t\t" + var.from_hu_conv[1] + ";\n"
 613                 else:
 614                     bindings_instantiator += ", " + first_to_lower(var.arg_name)
 615             else:
 616                 bindings_instantiator += ", " + first_to_lower(var[1]) + ".bindings_instance"
 617                 super_instantiator += first_to_lower(var[1]) + "_impl, "
 618                 pointer_to_adder += "\t\timpl_holder.held.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 619                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}Interface"
 620
 621         super_constructor_statements = ""
 622         trait_constructor_arguments = ""
 623         for var in field_var_conversions:
 624             if isinstance(var, ConvInfo):
 625                 trait_constructor_arguments += ", " + var.arg_name
 626             else:
 627                 super_constructor_statements += "\t\tconst " + first_to_lower(var[1]) + " = " + var[1] + ".new_impl(" + super_instantiator + ");\n"
 628                 trait_constructor_arguments += ", " + first_to_lower(var[1]) + ".bindings_instance"
 629                 for suparg in var[2]:
 630                     if isinstance(suparg, ConvInfo):
 631                         trait_constructor_arguments += ", " + suparg.arg_name
 632                     else:
 633                         trait_constructor_arguments += ", " + suparg[1]
 634
 635         # BUILD INTERFACE METHODS
 636         out_java_interface = ""
 637         out_interface_implementation_overrides = ""
 638         java_methods = []
 639         for fn_line in field_function_lines:
 640             java_method_descriptor = ""
 641             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 642                 out_java_interface += "\t" + fn_line.fn_name + "("
 643                 out_interface_implementation_overrides += f"\t\t\t{fn_line.fn_name} ("
 644
 645                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 646                     if idx >= 1:
 647                         out_java_interface += ", "
 648                         out_interface_implementation_overrides += ", "
 649                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 650                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 651                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 652                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n"
 653                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 654                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 655
 656                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 657
 658                 for arg_info in fn_line.args_ty:
 659                     if arg_info.to_hu_conv is not None:
 660                         out_interface_implementation_overrides += "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 661
 662                 if fn_line.ret_ty_info.java_ty != "void":
 663                     out_interface_implementation_overrides += "\t\t\t\tconst ret: " + fn_line.ret_ty_info.java_hu_ty + " = arg." + fn_line.fn_name + "("
 664                 else:
 665                     out_interface_implementation_overrides += f"\t\t\t\targ." + fn_line.fn_name + "("
 666
 667                 for idx, arg_info in enumerate(fn_line.args_ty):
 668                     if idx != 0:
 669                         out_interface_implementation_overrides += ", "
 670                     if arg_info.to_hu_conv_name is not None:
 671                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 672                     else:
 673                         out_interface_implementation_overrides += arg_info.arg_name
 674
 675                 out_interface_implementation_overrides += ");\n"
 676                 if fn_line.ret_ty_info.java_ty != "void":
 677                     if fn_line.ret_ty_info.from_hu_conv is not None:
 678                         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"
 679                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 680                             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"
 681                         #if fn_line.ret_ty_info.rust_obj in result_types:
 682                         # XXX: We need to handle this in conversion logic so that its cross-language!
 683                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 684                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 685                         out_interface_implementation_overrides += "\t\t\t\treturn result;\n"
 686                     else:
 687                         out_interface_implementation_overrides += "\t\t\t\treturn ret;\n"
 688                 out_interface_implementation_overrides += f"\t\t\t}},\n"
 689
 690         out_typescript_human = f"""
 691 {self.hu_struct_file_prefix}
 692
 693 export interface {struct_name.replace("LDK", "")}Interface {{
 694 {out_java_interface}}}
 695
 696 class {struct_name}Holder {{
 697         held: {struct_name.replace("LDK", "")};
 698 }}
 699
 700 export class {struct_name.replace("LDK","")} extends CommonBase {{
 701         /* @internal */
 702         public bindings_instance?: bindings.{struct_name};
 703
 704         /* @internal */
 705         constructor(_dummy: object, ptr: number) {{
 706                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
 707                 this.bindings_instance = null;
 708         }}
 709
 710         static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 711                 const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 712                 let structImplementation = {{
 713 {out_interface_implementation_overrides}                }} as bindings.{struct_name};
 714 {super_constructor_statements}          const ptr: number = bindings.{struct_name}_new(structImplementation{bindings_instantiator});
 715
 716                 impl_holder.held = new {struct_name.replace("LDK", "")}(null, ptr);
 717                 impl_holder.held.bindings_instance = structImplementation;
 718 {pointer_to_adder}              return impl_holder.held;
 719         }}
 720 """
 721         self.obj_defined([struct_name.replace("LDK", ""), struct_name.replace("LDK", "") + "Interface"], "structs")
 722
 723         out_typescript_bindings += "export interface " + struct_name + " {\n"
 724         java_meths = []
 725         for fn_line in field_function_lines:
 726             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 727                 out_typescript_bindings += f"\t{fn_line.fn_name} ("
 728
 729                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 730                     if idx >= 1:
 731                         out_typescript_bindings = out_typescript_bindings + ", "
 732                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 733
 734                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 735
 736         out_typescript_bindings += "}\n\n"
 737
 738         out_typescript_bindings += f"export function {struct_name}_new(impl: {struct_name}"
 739         for var in flattened_field_var_conversions:
 740             if isinstance(var, ConvInfo):
 741                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 742             else:
 743                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 744
 745         out_typescript_bindings += f"""): number {{
 746         if(!isWasmInitialized) {{
 747                 throw new Error("initializeWasm() must be awaited first!");
 748         }}
 749         var new_obj_idx = js_objs.length;
 750         for (var i = 0; i < js_objs.length; i++) {{
 751                 if (js_objs[i] == null || js_objs[i] == undefined) {{ new_obj_idx = i; break; }}
 752         }}
 753         js_objs[i] = new WeakRef(impl);
 754         return wasm.TS_{struct_name}_new(i);
 755 }}
 756 """
 757
 758         out_typescript_bindings += '\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: END\n\n\n'
 759
 760         # Now that we've written out our java code (and created java_meths), generate C
 761         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 762         out_c += "\tatomic_size_t refcnt;\n"
 763         out_c += "\tuint32_t instance_ptr;\n"
 764         for var in flattened_field_var_conversions:
 765             if isinstance(var, ConvInfo):
 766                 # We're a regular ol' field
 767                 pass
 768             else:
 769                 # We're a supertrait
 770                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 771         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 772
 773         for fn_line in field_function_lines:
 774             if fn_line.fn_name == "free":
 775                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 776                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 777                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 778                 out_c = out_c + "\t\tFREE(j_calls);\n"
 779                 out_c = out_c + "\t}\n}\n"
 780
 781         for idx, fn_line in enumerate(field_function_lines):
 782             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 783                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 784                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 785                 if fn_line.self_is_const:
 786                     out_c = out_c + "const void* this_arg"
 787                 else:
 788                     out_c = out_c + "void* this_arg"
 789
 790                 for idx, arg in enumerate(fn_line.args_ty):
 791                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 792
 793                 out_c = out_c + ") {\n"
 794                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 795
 796                 for arg_info in fn_line.args_ty:
 797                     if arg_info.ret_conv is not None:
 798                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 799                         out_c = out_c + arg_info.arg_name
 800                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 801
 802                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 803                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (" + fn_line.ret_ty_info.c_ty + ")"
 804                     out_c += "js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 805                 elif fn_line.ret_ty_info.java_ty == "void":
 806                     out_c = out_c + "\tjs_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 807                 elif fn_line.ret_ty_info.java_ty == "String":
 808                     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)
 809                 elif not fn_line.ret_ty_info.passed_as_ptr:
 810                     out_c = out_c + "\treturn js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 811                 else:
 812                     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)
 813
 814                 self.function_ptrs[self.function_ptr_counter] = (struct_name, fn_line.fn_name)
 815                 self.function_ptr_counter += 1
 816
 817                 for idx, arg_info in enumerate(fn_line.args_ty):
 818                     if arg_info.ret_conv is not None:
 819                         out_c = out_c + ", (uint32_t)" + arg_info.ret_conv_name
 820                     else:
 821                         out_c = out_c + ", (uint32_t)" + arg_info.arg_name
 822                 out_c = out_c + ");\n"
 823                 if fn_line.ret_ty_info.arg_conv is not None:
 824                     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"
 825
 826                 out_c = out_c + "}\n"
 827
 828         # Write out a clone function whether we need one or not, as we use them in moving to rust
 829         out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
 830         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
 831         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 832         for var in field_var_conversions:
 833             if not isinstance(var, ConvInfo):
 834                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 835         out_c = out_c + "}\n"
 836
 837         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (JSValue o"
 838         for var in flattened_field_var_conversions:
 839             if isinstance(var, ConvInfo):
 840                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 841             else:
 842                 out_c = out_c + ", JSValue " + var[1]
 843         out_c = out_c + ") {\n"
 844
 845         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 846         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 847         out_c = out_c + "\tcalls->instance_ptr = o;\n"
 848
 849         for (fn_name, java_meth_descr) in java_meths:
 850             if fn_name != "free" and fn_name != "cloned":
 851                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 852                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 853
 854         for var in flattened_field_var_conversions:
 855             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 856                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 857         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 858         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 859         for fn_line in field_function_lines:
 860             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 861                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 862             elif fn_line.fn_name == "free":
 863                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 864             else:
 865                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
 866         for var in field_var_conversions:
 867             if isinstance(var, ConvInfo):
 868                 if var.arg_conv_name is not None:
 869                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 870                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 871                 else:
 872                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 873                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 874             else:
 875                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(" + var[1]
 876                 for suparg in var[2]:
 877                     if isinstance(suparg, ConvInfo):
 878                         out_c += ", " + suparg.arg_name
 879                     else:
 880                         out_c += ", " + suparg[1]
 881                 out_c += "),\n"
 882         out_c = out_c + "\t};\n"
 883         for var in flattened_field_var_conversions:
 884             if not isinstance(var, ConvInfo):
 885                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 886         out_c = out_c + "\treturn ret;\n"
 887         out_c = out_c + "}\n"
 888
 889         out_c = out_c + self.c_fn_ty_pfx + "long " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "JSValue o"
 890         for var in flattened_field_var_conversions:
 891             if isinstance(var, ConvInfo):
 892                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 893             else:
 894                 out_c = out_c + ", JSValue " + var[1]
 895         out_c = out_c + ") {\n"
 896         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 897         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(o"
 898         for var in flattened_field_var_conversions:
 899             if isinstance(var, ConvInfo):
 900                 out_c = out_c + ", " + var.arg_name
 901             else:
 902                 out_c = out_c + ", " + var[1]
 903         out_c = out_c + ");\n"
 904         out_c = out_c + "\treturn (long)res_ptr;\n"
 905         out_c = out_c + "}\n"
 906
 907         return (out_typescript_bindings, out_typescript_human, out_c)
 908
 909     def trait_struct_inc_refcnt(self, ty_info):
 910         return ""
 911
 912     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
 913         bindings_type = struct_name.replace("LDK", "")
 914         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
 915
 916         out_java_enum = ""
 917         out_java = ""
 918         out_c = ""
 919
 920         out_java_enum += (self.hu_struct_file_prefix)
 921
 922         java_hu_class = ""
 923         java_hu_class += "export class " + java_hu_type + " extends CommonBase {\n"
 924         java_hu_class += "\tprotected constructor(_dummy: object, ptr: number) { super(ptr, bindings." + bindings_type + "_free); }\n"
 925         java_hu_class += "\t/* @internal */\n"
 926         java_hu_class += f"\tpublic static constr_from_ptr(ptr: number): {java_hu_type} {{\n"
 927         java_hu_class += f"\t\tconst raw_val: bindings.{struct_name} = bindings." + struct_name + "_ref_from_ptr(ptr);\n"
 928         java_hu_subclasses = ""
 929
 930         out_java += "export class " + struct_name + " {\n"
 931         out_java += "\tprotected constructor() {}\n"
 932         java_subclasses = ""
 933         for var in variant_list:
 934             java_subclasses += "export class " + struct_name + "_" + var.var_name + " extends " + struct_name + " {\n"
 935             java_hu_subclasses = java_hu_subclasses + "export class " + java_hu_type + "_" + var.var_name + " extends " + java_hu_type + " {\n"
 936             java_hu_class += "\t\tif (raw_val instanceof bindings." + struct_name + "_" + var.var_name + ") {\n"
 937             java_hu_class += "\t\t\treturn new " + java_hu_type + "_" + var.var_name + "(ptr, raw_val);\n"
 938             init_meth_params = ""
 939             hu_conv_body = ""
 940             for idx, (field_ty, field_docs) in enumerate(var.fields):
 941                 java_hu_subclasses = java_hu_subclasses + "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
 942                 if field_ty.to_hu_conv is not None:
 943                     hu_conv_body = hu_conv_body + "\t\tconst " + field_ty.arg_name + f": {field_ty.java_ty} = obj." + field_ty.arg_name + ";\n"
 944                     hu_conv_body = hu_conv_body + "\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 945                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 946                 else:
 947                     hu_conv_body = hu_conv_body + "\t\tthis." + field_ty.arg_name + " = obj." + field_ty.arg_name + ";\n"
 948                 if idx > 0:
 949                     init_meth_params += ", "
 950                 init_meth_params += "public " + field_ty.arg_name + ": " + field_ty.java_ty
 951             java_subclasses += "\tconstructor(" + init_meth_params + ") { super(); }\n"
 952             java_subclasses += "}\n"
 953             java_hu_class += "\t\t}\n"
 954             java_hu_subclasses += "\t/* @internal */\n"
 955             java_hu_subclasses += "\tpublic constructor(ptr: number, obj: bindings." + struct_name + "_" + var.var_name + ") {\n\t\tsuper(null, ptr);\n"
 956             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 957             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
 958         out_java += "}\n"
 959         out_java += java_subclasses
 960         java_hu_class += "\t\tthrow new Error('oops, this should be unreachable'); // Unreachable without extending the (internal) bindings interface\n\t}\n\n"
 961         out_java += self.fn_call_body(struct_name + "_ref_from_ptr", "uint32_t", "number", "ptr: number", "ptr")
 962
 963         out_c += (self.c_fn_ty_pfx + self.c_complex_enum_pass_ty(struct_name) + self.c_fn_name_define_pfx(struct_name + "_ref_from_ptr", True) + self.ptr_c_ty + " ptr) {\n")
 964         out_c += ("\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n")
 965         out_c += ("\tswitch(obj->tag) {\n")
 966         for var in variant_list:
 967             out_c += ("\t\tcase " + struct_name + "_" + var.var_name + ": {\n")
 968             c_params = []
 969             for idx, (field_map, _) in enumerate(var.fields):
 970                 if field_map.ret_conv is not None:
 971                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 972                     if var.tuple_variant:
 973                         out_c += "obj->" + camel_to_snake(var.var_name)
 974                     else:
 975                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
 976                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 977                     c_params.append(field_map.ret_conv_name)
 978                 else:
 979                     if var.tuple_variant:
 980                         c_params.append("obj->" + camel_to_snake(var.var_name))
 981                     else:
 982                         c_params.append("obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name)
 983             out_c += ("\t\t\treturn " + self.c_constr_native_complex_enum(struct_name, var.var_name, c_params) + ";\n")
 984             out_c += ("\t\t}\n")
 985         out_c += ("\t\tdefault: abort();\n")
 986         out_c += ("\t}\n}\n")
 987         out_java_enum += java_hu_class
 988         self.struct_file_suffixes[java_hu_type] = java_hu_subclasses
 989         self.obj_defined([java_hu_type], "structs")
 990         return (out_java, out_java_enum, out_c)
 991
 992     def map_opaque_struct(self, struct_name, struct_doc_comment):
 993         implementations = ""
 994         method_header = ""
 995
 996         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
 997         out_opaque_struct_human = f"{self.hu_struct_file_prefix}"
 998         if struct_name.startswith("LDKLocked"):
 999             out_opaque_struct_human += "/** XXX: DO NOT USE THIS - it remains locked until the GC runs (if that ever happens */"
1000         out_opaque_struct_human += f"""
1001 export class {hu_name} extends CommonBase {implementations}{{
1002         /* @internal */
1003         public constructor(_dummy: object, ptr: number) {{
1004                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1005         }}
1006
1007 """
1008         self.obj_defined([hu_name], "structs")
1009         return out_opaque_struct_human
1010
1011     def map_tuple(self, struct_name):
1012         return self.map_opaque_struct(struct_name, "A Tuple")
1013
1014     def map_result(self, struct_name, res_map, err_map):
1015         human_ty = struct_name.replace("LDKCResult", "Result")
1016
1017         suffixes = f"export class {human_ty}_OK extends {human_ty} {{\n"
1018         if res_map.java_hu_ty != "void":
1019             suffixes += "\tpublic res: " + res_map.java_hu_ty + ";\n"
1020         suffixes += f"""
1021         /* @internal */
1022         public constructor(_dummy: object, ptr: number) {{
1023                 super(_dummy, ptr);
1024 """
1025         if res_map.java_hu_ty == "void":
1026             pass
1027         elif res_map.to_hu_conv is not None:
1028             suffixes += "\t\tconst res: " + res_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1029             suffixes += "\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t")
1030             suffixes += "\n\t\tthis.res = " + res_map.to_hu_conv_name + ";\n"
1031         else:
1032             suffixes += "\t\tthis.res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1033         suffixes += "\t}\n}\n"
1034
1035         suffixes += f"export class {human_ty}_Err extends {human_ty} {{\n"
1036         if err_map.java_hu_ty != "void":
1037             suffixes += "\tpublic err: " + err_map.java_hu_ty + ";\n"
1038         suffixes += f"""
1039         /* @internal */
1040         public constructor(_dummy: object, ptr: number) {{
1041                 super(_dummy, ptr);
1042 """
1043         if err_map.java_hu_ty == "void":
1044             pass
1045         elif err_map.to_hu_conv is not None:
1046             suffixes += "\t\tconst err: " + err_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1047             suffixes += "\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t")
1048             suffixes += "\n\t\tthis.err = " + err_map.to_hu_conv_name + ";\n"
1049         else:
1050             suffixes += "\t\tthis.err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1051         suffixes += "\t}\n}"
1052
1053         self.struct_file_suffixes[human_ty] = suffixes
1054         self.obj_defined([human_ty], "structs")
1055
1056         return f"""{self.hu_struct_file_prefix}
1057
1058 export class {human_ty} extends CommonBase {{
1059         protected constructor(_dummy: object, ptr: number) {{
1060                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1061         }}
1062         /* @internal */
1063         public static constr_from_ptr(ptr: number): {human_ty} {{
1064                 if (bindings.{struct_name.replace("LDK", "")}_is_ok(ptr)) {{
1065                         return new {human_ty}_OK(null, ptr);
1066                 }} else {{
1067                         return new {human_ty}_Err(null, ptr);
1068                 }}
1069         }}
1070 """
1071
1072     def fn_call_body(self, method_name, return_c_ty, return_java_ty, method_argument_string, native_call_argument_string):
1073         has_return_value = return_c_ty != 'void'
1074         needs_decoding = return_c_ty in self.wasm_decoding_map
1075         return_statement = 'return nativeResponseValue;'
1076         if not has_return_value:
1077             return_statement = '// debug statements here'
1078         elif needs_decoding:
1079             converter = self.wasm_decoding_map[return_c_ty]
1080             return_statement = f"return {converter}(nativeResponseValue);"
1081
1082         return f"""export function {method_name}({method_argument_string}): {return_java_ty} {{
1083         if(!isWasmInitialized) {{
1084                 throw new Error("initializeWasm() must be awaited first!");
1085         }}
1086         const nativeResponseValue = wasm.TS_{method_name}({native_call_argument_string});
1087         {return_statement}
1088 }}
1089 """
1090     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):
1091         out_java = ""
1092         out_c = ""
1093         out_java_struct = None
1094
1095         out_java += ("\t")
1096         out_c += (self.c_fn_ty_pfx)
1097         out_c += (return_type_info.c_ty)
1098         out_java += (return_type_info.java_ty)
1099         if return_type_info.ret_conv is not None:
1100             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1101         out_java += (" " + method_name + "(")
1102         out_c += (" "  + self.c_fn_name_define_pfx(method_name, True))
1103
1104         method_argument_string = ""
1105         native_call_argument_string = ""
1106         for idx, arg_conv_info in enumerate(argument_types):
1107             if idx != 0:
1108                 method_argument_string += (", ")
1109                 native_call_argument_string += ', '
1110                 out_c += (", ")
1111             if arg_conv_info.c_ty != "void":
1112                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1113                 needs_encoding = arg_conv_info.c_ty in self.wasm_encoding_map
1114                 native_argument = arg_conv_info.arg_name
1115                 if needs_encoding:
1116                     converter = self.wasm_encoding_map[arg_conv_info.c_ty]
1117                     native_argument = f"{converter}({arg_conv_info.arg_name})"
1118                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
1119                 native_call_argument_string += native_argument
1120         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)
1121
1122         out_java_struct = ""
1123         if not args_known:
1124             out_java_struct += ("\t// Skipped " + method_name + "\n")
1125         else:
1126             if not takes_self:
1127                 out_java_struct += (
1128                         "\tpublic static constructor_" + meth_n + "(")
1129             else:
1130                 out_java_struct += ("\tpublic " + meth_n + "(")
1131             for idx, arg in enumerate(argument_types):
1132                 if idx != 0:
1133                     if not takes_self or idx > 1:
1134                         out_java_struct += (", ")
1135                 elif takes_self:
1136                     continue
1137                 if arg.java_ty != "void":
1138                     if arg.arg_name in default_constructor_args:
1139                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1140                             if explode_idx != 0:
1141                                 out_java_struct += (", ")
1142                             out_java_struct += arg.arg_name + "_" + explode_arg.arg_name + ": " + explode_arg.java_hu_ty
1143                     else:
1144                         out_java_struct += arg.arg_name + ": " + arg.java_hu_ty
1145
1146         out_c += (") {\n")
1147         if out_java_struct is not None:
1148             out_java_struct += "): " + return_type_info.java_hu_ty + " {\n"
1149         for info in argument_types:
1150             if info.arg_conv is not None:
1151                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1152         if return_type_info.ret_conv is not None:
1153             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1154         elif return_type_info.c_ty != "void":
1155             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1156         else:
1157             out_c += ("\t")
1158         if c_call_string is None:
1159             out_c += (method_name + "(")
1160         else:
1161             out_c += (c_call_string)
1162         for idx, info in enumerate(argument_types):
1163             if info.arg_conv_name is not None:
1164                 if idx != 0:
1165                     out_c += (", ")
1166                 elif c_call_string is not None:
1167                     continue
1168                 out_c += (info.arg_conv_name)
1169         out_c += (")")
1170         if return_type_info.ret_conv is not None:
1171             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1172         else:
1173             out_c += (";")
1174         for info in argument_types:
1175             if info.arg_conv_cleanup is not None:
1176                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1177         if return_type_info.ret_conv is not None:
1178             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1179         elif return_type_info.c_ty != "void":
1180             out_c += ("\n\treturn ret_val;")
1181         out_c += ("\n}\n\n")
1182
1183         if args_known:
1184             out_java_struct += ("\t\t")
1185             if return_type_info.java_ty != "void":
1186                 out_java_struct += "const ret: " + return_type_info.java_ty + " = "
1187             out_java_struct += ("bindings." + method_name + "(")
1188             for idx, info in enumerate(argument_types):
1189                 if idx != 0:
1190                     out_java_struct += (", ")
1191                 if idx == 0 and takes_self:
1192                     out_java_struct += ("this.ptr")
1193                 elif info.arg_name in default_constructor_args:
1194                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1195                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1196                         if explode_idx != 0:
1197                             out_java_struct += (", ")
1198                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1199                         if explode_arg.from_hu_conv is not None:
1200                             out_java_struct += (
1201                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1202                         else:
1203                             out_java_struct += (expl_arg_name)
1204                     out_java_struct += (")")
1205                 elif info.from_hu_conv is not None:
1206                     out_java_struct += (info.from_hu_conv[0])
1207                 else:
1208                     out_java_struct += (info.arg_name)
1209             out_java_struct += (");\n")
1210             if return_type_info.to_hu_conv is not None:
1211                 if not takes_self:
1212                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1213                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1214                 else:
1215                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1216
1217             for idx, info in enumerate(argument_types):
1218                 if idx == 0 and takes_self:
1219                     pass
1220                 elif info.arg_name in default_constructor_args:
1221                     for explode_arg in default_constructor_args[info.arg_name]:
1222                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1223                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1224                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1225                                                                                              expl_arg_name).replace(
1226                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1227                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1228                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1229                         out_java_struct += (
1230                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1231                     else:
1232                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1233
1234             if return_type_info.to_hu_conv_name is not None:
1235                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1236             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1237                 out_java_struct += ("\t\treturn ret;\n")
1238             out_java_struct += ("\t}\n\n")
1239
1240         return (out_java, out_c, out_java_struct)
1241
1242     def cleanup(self):
1243         for struct in self.struct_file_suffixes:
1244             with open(self.outdir + "/structs/" + struct + self.file_ext, "a") as src:
1245                 src.write(self.struct_file_suffixes[struct])
1246
1247         with open(self.outdir + "/bindings.mts", "a") as bindings:
1248             bindings.write("""
1249
1250 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) {
1251         const weak: WeakRef<object> = js_objs[obj_ptr];
1252         if (weak == null || weak == undefined) {
1253                 console.error("Got function call on unknown/free'd JS object!");
1254                 throw new Error("Got function call on unknown/free'd JS object!");
1255         }
1256         const obj: object = weak.deref();
1257         if (obj == null || obj == undefined) {
1258                 console.error("Got function call on GC'd JS object!");
1259                 throw new Error("Got function call on GC'd JS object!");
1260         }
1261         var fn;
1262 """)
1263             bindings.write("\tswitch (fn_id) {\n")
1264             for f in self.function_ptrs:
1265                 bindings.write(f"\t\tcase {str(f)}: fn = Object.getOwnPropertyDescriptor(obj, \"{self.function_ptrs[f][1]}\"); break;\n")
1266
1267             bindings.write("""\t\tdefault:
1268                         console.error("Got unknown function call from C!");
1269                         throw new Error("Got unknown function call from C!");
1270         }
1271         if (fn == null || fn == undefined) {
1272                 console.error("Got function call on incorrect JS object!");
1273                 throw new Error("Got function call on incorrect JS object!");
1274         }
1275         return fn.value.bind(obj)(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10);
1276 }""")