_ 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 extern void __attribute__((noreturn)) abort(void);
 107 static inline void assert(bool expression) {
 108         if (!expression) { abort(); }
 109 }
 110
 111 uint32_t __attribute__((export_name("test_bigint_pass_deadbeef0badf00d"))) 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__((export_name("TS_malloc"))) TS_malloc(uint32_t size) {
 283         return (uint32_t)MALLOC(size, "JS-Called malloc");
 284 }
 285 void __attribute__((export_name("TS_free"))) 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 + "*)(((uint8_t*)", ") + 4)"
 340         return "(" + ty_info.c_ty + "*)(((uint8_t*)", ") + 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__((export_name(\"TS_" + fn_name + "\"))) 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
 368 imports.wasi_snapshot_preview1 = {
 369         "fd_write" : () => {
 370                 console.log("ABORT");
 371         },
 372         "random_get" : () => {
 373                 console.log("RAND GET");
 374         },
 375         "environ_sizes_get" : () => {
 376                 console.log("wasi_snapshot_preview1:environ_sizes_get");
 377         },
 378         "proc_exit" : () => {
 379                 console.log("wasi_snapshot_preview1:proc_exit");
 380         },
 381         "environ_get" : () => {
 382                 console.log("wasi_snapshot_preview1:environ_get");
 383         },
 384 };
 385
 386 var wasm: any = null;
 387 let isWasmInitialized: boolean = false;
 388 """
 389
 390         if target == Target.NODEJS:
 391             res += """import * as fs from 'fs';
 392 export async function initializeWasm(path: string) {
 393         const source = fs.readFileSync(path);
 394         imports.env["js_invoke_function"] = js_invoke;
 395         const { instance: wasmInstance } = await WebAssembly.instantiate(source, imports);
 396         wasm = wasmInstance.exports;
 397         if (!wasm.test_bigint_pass_deadbeef0badf00d(BigInt("0xdeadbeef0badf00d"))) {
 398                 throw new Error(\"Currently need BigInt-as-u64 support, try ----experimental-wasm-bigint");
 399         }
 400         isWasmInitialized = true;
 401 };
 402 """
 403         else:
 404             res += """
 405 export async function initializeWasm(uri: string) {
 406         const stream = fetch(uri);
 407         imports.env["js_invoke_function"] = js_invoke;
 408         const { instance: wasmInstance } = await WebAssembly.instantiateStreaming(stream, imports);
 409         wasm = wasmInstance.exports;
 410         if (!wasm.test_bigint_pass_deadbeef0badf00d(BigInt("0xdeadbeef0badf00d"))) {
 411                 throw new Error(\"Currently need BigInt-as-u64 support, try ----experimental-wasm-bigint");
 412         }
 413         isWasmInitialized = true;
 414 };
 415
 416 """
 417
 418         return res + """
 419
 420
 421 // WASM CODEC
 422
 423 const nextMultipleOfFour = (value: number) => {
 424         return Math.ceil(value / 4) * 4;
 425 }
 426
 427 const encodeUint8Array = (inputArray: Uint8Array) => {
 428         const cArrayPointer = wasm.TS_malloc(inputArray.length + 4);
 429         const arrayLengthView = new Uint32Array(wasm.memory.buffer, cArrayPointer, 1);
 430         arrayLengthView[0] = inputArray.length;
 431         const arrayMemoryView = new Uint8Array(wasm.memory.buffer, cArrayPointer + 4, inputArray.length);
 432         arrayMemoryView.set(inputArray);
 433         return cArrayPointer;
 434 }
 435
 436 const encodeUint32Array = (inputArray: Uint32Array) => {
 437         const cArrayPointer = wasm.TS_malloc((inputArray.length + 1) * 4);
 438         const arrayMemoryView = new Uint32Array(wasm.memory.buffer, cArrayPointer, inputArray.length);
 439         arrayMemoryView.set(inputArray, 1);
 440         arrayMemoryView[0] = inputArray.length;
 441         return cArrayPointer;
 442 }
 443
 444 const getArrayLength = (arrayPointer: number) => {
 445         const arraySizeViewer = new Uint32Array(
 446                 wasm.memory.buffer, // value
 447                 arrayPointer, // offset
 448                 1 // one int
 449         );
 450         return arraySizeViewer[0];
 451 }
 452 const decodeUint8Array = (arrayPointer: number, free = true) => {
 453         const arraySize = getArrayLength(arrayPointer);
 454         const actualArrayViewer = new Uint8Array(
 455                 wasm.memory.buffer, // value
 456                 arrayPointer + 4, // offset (ignoring length bytes)
 457                 arraySize // uint8 count
 458         );
 459         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 460         // will free the underlying memory when it becomes unreachable instead of copying here.
 461         const actualArray = actualArrayViewer.slice(0, arraySize);
 462         if (free) {
 463                 wasm.TS_free(arrayPointer);
 464         }
 465         return actualArray;
 466 }
 467 const decodeUint32Array = (arrayPointer: number, free = true) => {
 468         const arraySize = getArrayLength(arrayPointer);
 469         const actualArrayViewer = new Uint32Array(
 470                 wasm.memory.buffer, // value
 471                 arrayPointer + 4, // offset (ignoring length bytes)
 472                 arraySize // uint32 count
 473         );
 474         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 475         // will free the underlying memory when it becomes unreachable instead of copying here.
 476         const actualArray = actualArrayViewer.slice(0, arraySize);
 477         if (free) {
 478                 wasm.TS_free(arrayPointer);
 479         }
 480         return actualArray;
 481 }
 482
 483 const encodeString = (string: string) => {
 484         // make malloc count divisible by 4
 485         const memoryNeed = nextMultipleOfFour(string.length + 1);
 486         const stringPointer = wasm.TS_malloc(memoryNeed);
 487         const stringMemoryView = new Uint8Array(
 488                 wasm.memory.buffer, // value
 489                 stringPointer, // offset
 490                 string.length + 1 // length
 491         );
 492         for (let i = 0; i < string.length; i++) {
 493                 stringMemoryView[i] = string.charCodeAt(i);
 494         }
 495         stringMemoryView[string.length] = 0;
 496         return stringPointer;
 497 }
 498
 499 const decodeString = (stringPointer: number, free = true) => {
 500         const memoryView = new Uint8Array(wasm.memory.buffer, stringPointer);
 501         let cursor = 0;
 502         let result = '';
 503
 504         while (memoryView[cursor] !== 0) {
 505                 result += String.fromCharCode(memoryView[cursor]);
 506                 cursor++;
 507         }
 508
 509         if (free) {
 510                 wasm.wasm_free(stringPointer);
 511         }
 512
 513         return result;
 514 };
 515 """
 516
 517     def init_str(self):
 518         return ""
 519
 520     def constr_hu_array(self, ty_info, arr_len):
 521         return "new Array(" + arr_len + ").fill(null)"
 522
 523     def var_decl_statement(self, ty_string, var_name, statement):
 524         return "const " + var_name + ": " + ty_string + " = " + statement
 525
 526     def for_n_in_range(self, n, minimum, maximum):
 527         return "for (var " + n + " = " + minimum + "; " + n + " < " + maximum + "; " + n + "++) {"
 528     def for_n_in_arr(self, n, arr_name, arr_elem_ty):
 529         return (arr_name + ".forEach((" + n + ": " + arr_elem_ty.java_hu_ty + ") => { ", " })")
 530
 531     def get_ptr(self, var):
 532         return "CommonBase.get_ptr_of(" + var + ")"
 533     def set_null_skip_free(self, var):
 534         return "CommonBase.set_null_skip_free(" + var + ");"
 535
 536     def add_ref(self, holder, referent):
 537         return "CommonBase.add_ref_from(" + holder + ", " + referent + ")"
 538
 539     def obj_defined(self, struct_names, folder):
 540         with open(self.outdir + "/index.mts", 'a') as index:
 541             index.write(f"export * from './{folder}/{struct_names[0]}.mjs';\n")
 542         with open(self.outdir + "/imports.mts.part", 'a') as imports:
 543             imports.write(f"import {{ {', '.join(struct_names)} }} from '../{folder}/{struct_names[0]}.mjs';\n")
 544
 545     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 546         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_js(int32_t ord) {\n"
 547         out_c = out_c + "\tswitch (ord) {\n"
 548         ord_v = 0
 549
 550         out_typescript_enum_fields = ""
 551
 552         for var, var_docs in variants:
 553             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 554             ord_v = ord_v + 1
 555             if var_docs is not None:
 556                 out_typescript_enum_fields += f"/**\n * {var_docs}\n */\n"
 557             out_typescript_enum_fields += f"{var},\n\t\t\t\t"
 558         out_c = out_c + "\t}\n"
 559         out_c = out_c + "\tabort();\n"
 560         out_c = out_c + "}\n"
 561
 562         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_js(LDK" + struct_name + " val) {\n"
 563         out_c = out_c + "\tswitch (val) {\n"
 564         ord_v = 0
 565         for var, _ in variants:
 566             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 567             ord_v = ord_v + 1
 568         out_c = out_c + "\t\tdefault: abort();\n"
 569         out_c = out_c + "\t}\n"
 570         out_c = out_c + "}\n"
 571
 572         out_typescript = f"""
 573             export enum {struct_name} {{
 574                 {out_typescript_enum_fields}
 575             }}
 576 """
 577         out_typescript_enum = f"export {{ {struct_name} }} from \"../bindings.mjs\";"
 578         self.obj_defined([struct_name], "enums")
 579         return (out_c, out_typescript_enum, out_typescript)
 580
 581     def c_unitary_enum_to_native_call(self, ty_info):
 582         return (ty_info.rust_obj + "_to_js(", ")")
 583     def native_unitary_enum_to_c_call(self, ty_info):
 584         return (ty_info.rust_obj + "_from_js(", ")")
 585
 586     def native_c_map_trait(self, struct_name, field_var_conversions, flattened_field_var_conversions, field_function_lines, trait_doc_comment):
 587         out_typescript_bindings = "\n\n\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: START\n\n"
 588
 589         super_instantiator = ""
 590         bindings_instantiator = ""
 591         pointer_to_adder = ""
 592         impl_constructor_arguments = ""
 593         for var in flattened_field_var_conversions:
 594             if isinstance(var, ConvInfo):
 595                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 596                 super_instantiator += first_to_lower(var.arg_name) + ", "
 597                 if var.from_hu_conv is not None:
 598                     bindings_instantiator += ", " + var.from_hu_conv[0]
 599                     if var.from_hu_conv[1] != "":
 600                         pointer_to_adder += "\t\t\t" + var.from_hu_conv[1] + ";\n"
 601                 else:
 602                     bindings_instantiator += ", " + first_to_lower(var.arg_name)
 603             else:
 604                 bindings_instantiator += ", " + first_to_lower(var[1]) + ".bindings_instance"
 605                 super_instantiator += first_to_lower(var[1]) + "_impl, "
 606                 pointer_to_adder += "\t\timpl_holder.held.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 607                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}Interface"
 608
 609         super_constructor_statements = ""
 610         trait_constructor_arguments = ""
 611         for var in field_var_conversions:
 612             if isinstance(var, ConvInfo):
 613                 trait_constructor_arguments += ", " + var.arg_name
 614             else:
 615                 super_constructor_statements += "\t\tconst " + first_to_lower(var[1]) + " = " + var[1] + ".new_impl(" + super_instantiator + ");\n"
 616                 trait_constructor_arguments += ", " + first_to_lower(var[1]) + ".bindings_instance"
 617                 for suparg in var[2]:
 618                     if isinstance(suparg, ConvInfo):
 619                         trait_constructor_arguments += ", " + suparg.arg_name
 620                     else:
 621                         trait_constructor_arguments += ", " + suparg[1]
 622
 623         # BUILD INTERFACE METHODS
 624         out_java_interface = ""
 625         out_interface_implementation_overrides = ""
 626         java_methods = []
 627         for fn_line in field_function_lines:
 628             java_method_descriptor = ""
 629             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 630                 out_java_interface += "\t" + fn_line.fn_name + "("
 631                 out_interface_implementation_overrides += f"\t\t\t{fn_line.fn_name} ("
 632
 633                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 634                     if idx >= 1:
 635                         out_java_interface += ", "
 636                         out_interface_implementation_overrides += ", "
 637                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 638                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 639                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 640                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n"
 641                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 642                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 643
 644                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 645
 646                 for arg_info in fn_line.args_ty:
 647                     if arg_info.to_hu_conv is not None:
 648                         out_interface_implementation_overrides += "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 649
 650                 if fn_line.ret_ty_info.java_ty != "void":
 651                     out_interface_implementation_overrides += "\t\t\t\tconst ret: " + fn_line.ret_ty_info.java_hu_ty + " = arg." + fn_line.fn_name + "("
 652                 else:
 653                     out_interface_implementation_overrides += f"\t\t\t\targ." + fn_line.fn_name + "("
 654
 655                 for idx, arg_info in enumerate(fn_line.args_ty):
 656                     if idx != 0:
 657                         out_interface_implementation_overrides += ", "
 658                     if arg_info.to_hu_conv_name is not None:
 659                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 660                     else:
 661                         out_interface_implementation_overrides += arg_info.arg_name
 662
 663                 out_interface_implementation_overrides += ");\n"
 664                 if fn_line.ret_ty_info.java_ty != "void":
 665                     if fn_line.ret_ty_info.from_hu_conv is not None:
 666                         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"
 667                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 668                             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"
 669                         #if fn_line.ret_ty_info.rust_obj in result_types:
 670                         # XXX: We need to handle this in conversion logic so that its cross-language!
 671                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 672                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 673                         out_interface_implementation_overrides += "\t\t\t\treturn result;\n"
 674                     else:
 675                         out_interface_implementation_overrides += "\t\t\t\treturn ret;\n"
 676                 out_interface_implementation_overrides += f"\t\t\t}},\n"
 677
 678         out_typescript_human = f"""
 679 {self.hu_struct_file_prefix}
 680
 681 export interface {struct_name.replace("LDK", "")}Interface {{
 682 {out_java_interface}}}
 683
 684 class {struct_name}Holder {{
 685         held: {struct_name.replace("LDK", "")};
 686 }}
 687
 688 export class {struct_name.replace("LDK","")} extends CommonBase {{
 689         /* @internal */
 690         public bindings_instance?: bindings.{struct_name};
 691
 692         /* @internal */
 693         constructor(_dummy: object, ptr: number) {{
 694                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
 695                 this.bindings_instance = null;
 696         }}
 697
 698         static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 699                 const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 700                 let structImplementation = {{
 701 {out_interface_implementation_overrides}                }} as bindings.{struct_name};
 702 {super_constructor_statements}          const ptr: number = bindings.{struct_name}_new(structImplementation{bindings_instantiator});
 703
 704                 impl_holder.held = new {struct_name.replace("LDK", "")}(null, ptr);
 705                 impl_holder.held.bindings_instance = structImplementation;
 706 {pointer_to_adder}              return impl_holder.held;
 707         }}
 708 """
 709         self.obj_defined([struct_name.replace("LDK", ""), struct_name.replace("LDK", "") + "Interface"], "structs")
 710
 711         out_typescript_bindings += "export interface " + struct_name + " {\n"
 712         java_meths = []
 713         for fn_line in field_function_lines:
 714             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 715                 out_typescript_bindings += f"\t{fn_line.fn_name} ("
 716
 717                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 718                     if idx >= 1:
 719                         out_typescript_bindings = out_typescript_bindings + ", "
 720                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 721
 722                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 723
 724         out_typescript_bindings += "}\n\n"
 725
 726         out_typescript_bindings += f"export function {struct_name}_new(impl: {struct_name}"
 727         for var in flattened_field_var_conversions:
 728             if isinstance(var, ConvInfo):
 729                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 730             else:
 731                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 732
 733         out_typescript_bindings += f"""): number {{
 734         if(!isWasmInitialized) {{
 735                 throw new Error("initializeWasm() must be awaited first!");
 736         }}
 737         var new_obj_idx = js_objs.length;
 738         for (var i = 0; i < js_objs.length; i++) {{
 739                 if (js_objs[i] == null || js_objs[i] == undefined) {{ new_obj_idx = i; break; }}
 740         }}
 741         js_objs[i] = new WeakRef(impl);
 742         return wasm.TS_{struct_name}_new(i);
 743 }}
 744 """
 745
 746         out_typescript_bindings += '\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: END\n\n\n'
 747
 748         # Now that we've written out our java code (and created java_meths), generate C
 749         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 750         out_c += "\tatomic_size_t refcnt;\n"
 751         out_c += "\tuint32_t instance_ptr;\n"
 752         for var in flattened_field_var_conversions:
 753             if isinstance(var, ConvInfo):
 754                 # We're a regular ol' field
 755                 pass
 756             else:
 757                 # We're a supertrait
 758                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 759         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 760
 761         for fn_line in field_function_lines:
 762             if fn_line.fn_name == "free":
 763                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 764                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 765                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 766                 out_c = out_c + "\t\tFREE(j_calls);\n"
 767                 out_c = out_c + "\t}\n}\n"
 768
 769         for idx, fn_line in enumerate(field_function_lines):
 770             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 771                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 772                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 773                 if fn_line.self_is_const:
 774                     out_c = out_c + "const void* this_arg"
 775                 else:
 776                     out_c = out_c + "void* this_arg"
 777
 778                 for idx, arg in enumerate(fn_line.args_ty):
 779                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 780
 781                 out_c = out_c + ") {\n"
 782                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 783
 784                 for arg_info in fn_line.args_ty:
 785                     if arg_info.ret_conv is not None:
 786                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 787                         out_c = out_c + arg_info.arg_name
 788                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 789
 790                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 791                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (" + fn_line.ret_ty_info.c_ty + ")"
 792                     out_c += "js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 793                 elif fn_line.ret_ty_info.java_ty == "void":
 794                     out_c = out_c + "\tjs_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 795                 elif fn_line.ret_ty_info.java_ty == "String":
 796                     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)
 797                 elif not fn_line.ret_ty_info.passed_as_ptr:
 798                     out_c = out_c + "\treturn js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 799                 else:
 800                     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)
 801
 802                 self.function_ptrs[self.function_ptr_counter] = (struct_name, fn_line.fn_name)
 803                 self.function_ptr_counter += 1
 804
 805                 for idx, arg_info in enumerate(fn_line.args_ty):
 806                     if arg_info.ret_conv is not None:
 807                         out_c = out_c + ", (uint32_t)" + arg_info.ret_conv_name
 808                     else:
 809                         out_c = out_c + ", (uint32_t)" + arg_info.arg_name
 810                 out_c = out_c + ");\n"
 811                 if fn_line.ret_ty_info.arg_conv is not None:
 812                     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"
 813
 814                 out_c = out_c + "}\n"
 815
 816         # Write out a clone function whether we need one or not, as we use them in moving to rust
 817         out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
 818         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
 819         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 820         for var in field_var_conversions:
 821             if not isinstance(var, ConvInfo):
 822                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 823         out_c = out_c + "}\n"
 824
 825         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (JSValue o"
 826         for var in flattened_field_var_conversions:
 827             if isinstance(var, ConvInfo):
 828                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 829             else:
 830                 out_c = out_c + ", JSValue " + var[1]
 831         out_c = out_c + ") {\n"
 832
 833         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 834         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 835         out_c = out_c + "\tcalls->instance_ptr = o;\n"
 836
 837         for (fn_name, java_meth_descr) in java_meths:
 838             if fn_name != "free" and fn_name != "cloned":
 839                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 840                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 841
 842         for var in flattened_field_var_conversions:
 843             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 844                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 845         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 846         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 847         for fn_line in field_function_lines:
 848             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 849                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 850             elif fn_line.fn_name == "free":
 851                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 852             else:
 853                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
 854         for var in field_var_conversions:
 855             if isinstance(var, ConvInfo):
 856                 if var.arg_conv_name is not None:
 857                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 858                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 859                 else:
 860                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 861                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 862             else:
 863                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(" + var[1]
 864                 for suparg in var[2]:
 865                     if isinstance(suparg, ConvInfo):
 866                         out_c += ", " + suparg.arg_name
 867                     else:
 868                         out_c += ", " + suparg[1]
 869                 out_c += "),\n"
 870         out_c = out_c + "\t};\n"
 871         for var in flattened_field_var_conversions:
 872             if not isinstance(var, ConvInfo):
 873                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 874         out_c = out_c + "\treturn ret;\n"
 875         out_c = out_c + "}\n"
 876
 877         out_c = out_c + self.c_fn_ty_pfx + "long " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "JSValue o"
 878         for var in flattened_field_var_conversions:
 879             if isinstance(var, ConvInfo):
 880                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 881             else:
 882                 out_c = out_c + ", JSValue " + var[1]
 883         out_c = out_c + ") {\n"
 884         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 885         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(o"
 886         for var in flattened_field_var_conversions:
 887             if isinstance(var, ConvInfo):
 888                 out_c = out_c + ", " + var.arg_name
 889             else:
 890                 out_c = out_c + ", " + var[1]
 891         out_c = out_c + ");\n"
 892         out_c = out_c + "\treturn (long)res_ptr;\n"
 893         out_c = out_c + "}\n"
 894
 895         return (out_typescript_bindings, out_typescript_human, out_c)
 896
 897     def trait_struct_inc_refcnt(self, ty_info):
 898         return ""
 899
 900     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
 901         bindings_type = struct_name.replace("LDK", "")
 902         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
 903
 904         out_java_enum = ""
 905         out_java = ""
 906         out_c = ""
 907
 908         out_java_enum += (self.hu_struct_file_prefix)
 909
 910         java_hu_class = ""
 911         java_hu_class += "export class " + java_hu_type + " extends CommonBase {\n"
 912         java_hu_class += "\tprotected constructor(_dummy: object, ptr: number) { super(ptr, bindings." + bindings_type + "_free); }\n"
 913         java_hu_class += "\t/* @internal */\n"
 914         java_hu_class += f"\tpublic static constr_from_ptr(ptr: number): {java_hu_type} {{\n"
 915         java_hu_class += f"\t\tconst raw_ty: number = bindings." + struct_name + "_ty_from_ptr(ptr);\n"
 916         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"
 917         out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n"
 918         out_c += "\tswitch(obj->tag) {\n"
 919         java_hu_class += "\t\tswitch (raw_ty) {\n"
 920         java_hu_subclasses = ""
 921
 922         out_java += "export class " + struct_name + " {\n"
 923         out_java += "\tprotected constructor() {}\n"
 924         var_idx = 0
 925         for var in variant_list:
 926             java_hu_subclasses = java_hu_subclasses + "export class " + java_hu_type + "_" + var.var_name + " extends " + java_hu_type + " {\n"
 927             java_hu_class += f"\t\t\tcase {var_idx}: "
 928             java_hu_class += "return new " + java_hu_type + "_" + var.var_name + "(ptr);\n"
 929             out_c += f"\t\tcase {struct_name}_{var.var_name}: return {var_idx};\n"
 930             hu_conv_body = ""
 931             for idx, (field_ty, field_docs) in enumerate(var.fields):
 932                 java_hu_subclasses = java_hu_subclasses + "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
 933                 if field_ty.to_hu_conv is not None:
 934                     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"
 935                     hu_conv_body += f"\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 936                     hu_conv_body += f"\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 937                 else:
 938                     hu_conv_body += f"\t\tthis.{field_ty.arg_name} = bindings.{struct_name}_{var.var_name}_get_{field_ty.arg_name}(ptr);\n"
 939             java_hu_subclasses += "\t/* @internal */\n"
 940             java_hu_subclasses += "\tpublic constructor(ptr: number) {\n\t\tsuper(null, ptr);\n"
 941             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 942             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
 943             var_idx += 1
 944         out_java += "}\n"
 945         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"
 946         out_java += self.fn_call_body(struct_name + "_ty_from_ptr", "uint32_t", "number", "ptr: number", "ptr")
 947         out_c += ("\t\tdefault: abort();\n")
 948         out_c += ("\t}\n}\n")
 949
 950         for var in variant_list:
 951             for idx, (field_map, _) in enumerate(var.fields):
 952                 fn_name = f"{struct_name}_{var.var_name}_get_{field_map.arg_name}"
 953                 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"
 954                 out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n"
 955                 out_c += f"\tassert(obj->tag == {struct_name}_{var.var_name});\n"
 956                 if field_map.ret_conv is not None:
 957                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 958                     if var.tuple_variant:
 959                         out_c += "obj->" + camel_to_snake(var.var_name)
 960                     else:
 961                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
 962                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 963                     out_c += "\treturn " + field_map.ret_conv_name + ";\n"
 964                 else:
 965                     if var.tuple_variant:
 966                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + ";\n"
 967                     else:
 968                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name + ";\n"
 969                 out_c += "}\n"
 970                 out_java += self.fn_call_body(fn_name, field_map.c_ty, field_map.java_ty, "ptr: number", "ptr")
 971         out_java_enum += java_hu_class
 972         self.struct_file_suffixes[java_hu_type] = java_hu_subclasses
 973         self.obj_defined([java_hu_type], "structs")
 974         return (out_java, out_java_enum, out_c)
 975
 976     def map_opaque_struct(self, struct_name, struct_doc_comment):
 977         implementations = ""
 978         method_header = ""
 979
 980         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
 981         out_opaque_struct_human = f"{self.hu_struct_file_prefix}"
 982         if struct_name.startswith("LDKLocked"):
 983             out_opaque_struct_human += "/** XXX: DO NOT USE THIS - it remains locked until the GC runs (if that ever happens */"
 984         out_opaque_struct_human += f"""
 985 export class {hu_name} extends CommonBase {implementations}{{
 986         /* @internal */
 987         public constructor(_dummy: object, ptr: number) {{
 988                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
 989         }}
 990
 991 """
 992         self.obj_defined([hu_name], "structs")
 993         return out_opaque_struct_human
 994
 995     def map_tuple(self, struct_name):
 996         return self.map_opaque_struct(struct_name, "A Tuple")
 997
 998     def map_result(self, struct_name, res_map, err_map):
 999         human_ty = struct_name.replace("LDKCResult", "Result")
1000
1001         suffixes = f"export class {human_ty}_OK extends {human_ty} {{\n"
1002         if res_map.java_hu_ty != "void":
1003             suffixes += "\tpublic res: " + res_map.java_hu_ty + ";\n"
1004         suffixes += f"""
1005         /* @internal */
1006         public constructor(_dummy: object, ptr: number) {{
1007                 super(_dummy, ptr);
1008 """
1009         if res_map.java_hu_ty == "void":
1010             pass
1011         elif res_map.to_hu_conv is not None:
1012             suffixes += "\t\tconst res: " + res_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1013             suffixes += "\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t")
1014             suffixes += "\n\t\tthis.res = " + res_map.to_hu_conv_name + ";\n"
1015         else:
1016             suffixes += "\t\tthis.res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1017         suffixes += "\t}\n}\n"
1018
1019         suffixes += f"export class {human_ty}_Err extends {human_ty} {{\n"
1020         if err_map.java_hu_ty != "void":
1021             suffixes += "\tpublic err: " + err_map.java_hu_ty + ";\n"
1022         suffixes += f"""
1023         /* @internal */
1024         public constructor(_dummy: object, ptr: number) {{
1025                 super(_dummy, ptr);
1026 """
1027         if err_map.java_hu_ty == "void":
1028             pass
1029         elif err_map.to_hu_conv is not None:
1030             suffixes += "\t\tconst err: " + err_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1031             suffixes += "\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t")
1032             suffixes += "\n\t\tthis.err = " + err_map.to_hu_conv_name + ";\n"
1033         else:
1034             suffixes += "\t\tthis.err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1035         suffixes += "\t}\n}"
1036
1037         self.struct_file_suffixes[human_ty] = suffixes
1038         self.obj_defined([human_ty], "structs")
1039
1040         return f"""{self.hu_struct_file_prefix}
1041
1042 export class {human_ty} extends CommonBase {{
1043         protected constructor(_dummy: object, ptr: number) {{
1044                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1045         }}
1046         /* @internal */
1047         public static constr_from_ptr(ptr: number): {human_ty} {{
1048                 if (bindings.{struct_name.replace("LDK", "")}_is_ok(ptr)) {{
1049                         return new {human_ty}_OK(null, ptr);
1050                 }} else {{
1051                         return new {human_ty}_Err(null, ptr);
1052                 }}
1053         }}
1054 """
1055
1056     def fn_call_body(self, method_name, return_c_ty, return_java_ty, method_argument_string, native_call_argument_string):
1057         has_return_value = return_c_ty != 'void'
1058         needs_decoding = return_c_ty in self.wasm_decoding_map
1059         return_statement = 'return nativeResponseValue;'
1060         if not has_return_value:
1061             return_statement = '// debug statements here'
1062         elif needs_decoding:
1063             converter = self.wasm_decoding_map[return_c_ty]
1064             return_statement = f"return {converter}(nativeResponseValue);"
1065
1066         return f"""export function {method_name}({method_argument_string}): {return_java_ty} {{
1067         if(!isWasmInitialized) {{
1068                 throw new Error("initializeWasm() must be awaited first!");
1069         }}
1070         const nativeResponseValue = wasm.TS_{method_name}({native_call_argument_string});
1071         {return_statement}
1072 }}
1073 """
1074     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):
1075         out_java = ""
1076         out_c = ""
1077         out_java_struct = None
1078
1079         out_java += ("\t")
1080         out_c += (self.c_fn_ty_pfx)
1081         out_c += (return_type_info.c_ty)
1082         out_java += (return_type_info.java_ty)
1083         if return_type_info.ret_conv is not None:
1084             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1085         out_java += (" " + method_name + "(")
1086         out_c += (" "  + self.c_fn_name_define_pfx(method_name, True))
1087
1088         method_argument_string = ""
1089         native_call_argument_string = ""
1090         for idx, arg_conv_info in enumerate(argument_types):
1091             if idx != 0:
1092                 method_argument_string += (", ")
1093                 native_call_argument_string += ', '
1094                 out_c += (", ")
1095             if arg_conv_info.c_ty != "void":
1096                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1097                 needs_encoding = arg_conv_info.c_ty in self.wasm_encoding_map
1098                 native_argument = arg_conv_info.arg_name
1099                 if needs_encoding:
1100                     converter = self.wasm_encoding_map[arg_conv_info.c_ty]
1101                     native_argument = f"{converter}({arg_conv_info.arg_name})"
1102                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
1103                 native_call_argument_string += native_argument
1104         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)
1105
1106         out_java_struct = ""
1107         if not args_known:
1108             out_java_struct += ("\t// Skipped " + method_name + "\n")
1109         else:
1110             if not takes_self:
1111                 out_java_struct += (
1112                         "\tpublic static constructor_" + meth_n + "(")
1113             else:
1114                 out_java_struct += ("\tpublic " + meth_n + "(")
1115             for idx, arg in enumerate(argument_types):
1116                 if idx != 0:
1117                     if not takes_self or idx > 1:
1118                         out_java_struct += (", ")
1119                 elif takes_self:
1120                     continue
1121                 if arg.java_ty != "void":
1122                     if arg.arg_name in default_constructor_args:
1123                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1124                             if explode_idx != 0:
1125                                 out_java_struct += (", ")
1126                             out_java_struct += arg.arg_name + "_" + explode_arg.arg_name + ": " + explode_arg.java_hu_ty
1127                     else:
1128                         out_java_struct += arg.arg_name + ": " + arg.java_hu_ty
1129
1130         out_c += (") {\n")
1131         if out_java_struct is not None:
1132             out_java_struct += "): " + return_type_info.java_hu_ty + " {\n"
1133         for info in argument_types:
1134             if info.arg_conv is not None:
1135                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1136         if return_type_info.ret_conv is not None:
1137             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1138         elif return_type_info.c_ty != "void":
1139             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1140         else:
1141             out_c += ("\t")
1142         if c_call_string is None:
1143             out_c += (method_name + "(")
1144         else:
1145             out_c += (c_call_string)
1146         for idx, info in enumerate(argument_types):
1147             if info.arg_conv_name is not None:
1148                 if idx != 0:
1149                     out_c += (", ")
1150                 elif c_call_string is not None:
1151                     continue
1152                 out_c += (info.arg_conv_name)
1153         out_c += (")")
1154         if return_type_info.ret_conv is not None:
1155             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1156         else:
1157             out_c += (";")
1158         for info in argument_types:
1159             if info.arg_conv_cleanup is not None:
1160                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1161         if return_type_info.ret_conv is not None:
1162             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1163         elif return_type_info.c_ty != "void":
1164             out_c += ("\n\treturn ret_val;")
1165         out_c += ("\n}\n\n")
1166
1167         if args_known:
1168             out_java_struct += ("\t\t")
1169             if return_type_info.java_ty != "void":
1170                 out_java_struct += "const ret: " + return_type_info.java_ty + " = "
1171             out_java_struct += ("bindings." + method_name + "(")
1172             for idx, info in enumerate(argument_types):
1173                 if idx != 0:
1174                     out_java_struct += (", ")
1175                 if idx == 0 and takes_self:
1176                     out_java_struct += ("this.ptr")
1177                 elif info.arg_name in default_constructor_args:
1178                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1179                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1180                         if explode_idx != 0:
1181                             out_java_struct += (", ")
1182                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1183                         if explode_arg.from_hu_conv is not None:
1184                             out_java_struct += (
1185                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1186                         else:
1187                             out_java_struct += (expl_arg_name)
1188                     out_java_struct += (")")
1189                 elif info.from_hu_conv is not None:
1190                     out_java_struct += (info.from_hu_conv[0])
1191                 else:
1192                     out_java_struct += (info.arg_name)
1193             out_java_struct += (");\n")
1194             if return_type_info.to_hu_conv is not None:
1195                 if not takes_self:
1196                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1197                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1198                 else:
1199                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1200
1201             for idx, info in enumerate(argument_types):
1202                 if idx == 0 and takes_self:
1203                     pass
1204                 elif info.arg_name in default_constructor_args:
1205                     for explode_arg in default_constructor_args[info.arg_name]:
1206                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1207                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1208                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1209                                                                                              expl_arg_name).replace(
1210                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1211                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1212                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1213                         out_java_struct += (
1214                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1215                     else:
1216                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1217
1218             if return_type_info.to_hu_conv_name is not None:
1219                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1220             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1221                 out_java_struct += ("\t\treturn ret;\n")
1222             out_java_struct += ("\t}\n\n")
1223
1224         return (out_java, out_c, out_java_struct)
1225
1226     def cleanup(self):
1227         for struct in self.struct_file_suffixes:
1228             with open(self.outdir + "/structs/" + struct + self.file_ext, "a") as src:
1229                 src.write(self.struct_file_suffixes[struct])
1230
1231         with open(self.outdir + "/bindings.mts", "a") as bindings:
1232             bindings.write("""
1233
1234 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) {
1235         const weak: WeakRef<object> = js_objs[obj_ptr];
1236         if (weak == null || weak == undefined) {
1237                 console.error("Got function call on unknown/free'd JS object!");
1238                 throw new Error("Got function call on unknown/free'd JS object!");
1239         }
1240         const obj: object = weak.deref();
1241         if (obj == null || obj == undefined) {
1242                 console.error("Got function call on GC'd JS object!");
1243                 throw new Error("Got function call on GC'd JS object!");
1244         }
1245         var fn;
1246 """)
1247             bindings.write("\tswitch (fn_id) {\n")
1248             for f in self.function_ptrs:
1249                 bindings.write(f"\t\tcase {str(f)}: fn = Object.getOwnPropertyDescriptor(obj, \"{self.function_ptrs[f][1]}\"); break;\n")
1250
1251             bindings.write("""\t\tdefault:
1252                         console.error("Got unknown function call from C!");
1253                         throw new Error("Got unknown function call from C!");
1254         }
1255         if (fn == null || fn == undefined) {
1256                 console.error("Got function call on incorrect JS object!");
1257                 throw new Error("Got function call on incorrect JS object!");
1258         }
1259         return fn.value.bind(obj)(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10);
1260 }""")