_ 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": (fd: number, iovec_array_ptr: number, iovec_array_len: number) => {
 370                 // This should generally only be used to print panic messages
 371                 console.log("FD_WRITE to " + fd + " in " + iovec_array_len + " chunks.");
 372                 const ptr_len_view = new Uint32Array(wasm.memory.buffer, iovec_array_ptr, iovec_array_len * 2);
 373                 for (var i = 0; i < iovec_array_len; i++) {
 374                         const bytes_view = new Uint8Array(wasm.memory.buffer, ptr_len_view[i*2], ptr_len_view[i*2+1]);
 375                         console.log(String.fromCharCode(...bytes_view));
 376                 }
 377                 return 0;
 378         },
 379         "random_get": (buf_ptr: number, buf_len: number) => {
 380                 const buf = new Uint8Array(wasm.memory.buffer, buf_ptr, buf_len);
 381                 crypto.getRandomValues(buf);
 382                 return 0;
 383         },
 384         "environ_sizes_get": (environ_var_count_ptr: number, environ_len_ptr: number) => {
 385                 // This is called before fd_write to format + print panic messages
 386                 console.log("wasi_snapshot_preview1:environ_sizes_get");
 387                 const out_count_view = new Uint32Array(wasm.memory.buffer, environ_var_count_ptr, 1);
 388                 out_count_view[0] = 1;
 389                 const out_len_view = new Uint32Array(wasm.memory.buffer, environ_len_ptr, 1);
 390                 out_len_view[0] = "RUST_BACKTRACE=1".length + 1; // Note that string must be NULL-terminated
 391                 return 0;
 392         },
 393         "environ_get": (environ_ptr: number, environ_buf_ptr: number) => {
 394                 // This is called before fd_write to format + print panic messages
 395                 console.log("wasi_snapshot_preview1:environ_get");
 396                 const out_ptrs = new Uint32Array(wasm.memory.buffer, environ_ptr, 2);
 397                 out_ptrs[0] = environ_buf_ptr;
 398                 out_ptrs[1] = "RUST_BACKTRACE=1".length;
 399                 const out_environ = new Uint8Array(wasm.memory.buffer, environ_buf_ptr, out_ptrs[1]);
 400                 for (var i = 0; i < out_ptrs[1]; i++) { out_environ[i] = "RUST_BACKTRACE=1".codePointAt(i); }
 401                 out_environ[out_ptrs[1]] = 0;
 402                 return 0;
 403         },
 404         "proc_exit" : () => {
 405                 console.log("wasi_snapshot_preview1:proc_exit");
 406         },
 407 };
 408
 409 var wasm: any = null;
 410 let isWasmInitialized: boolean = false;
 411 """
 412
 413         if target == Target.NODEJS:
 414             res += """import * as fs from 'fs';
 415 import { webcrypto as crypto } from 'crypto';
 416 export async function initializeWasm(path: string) {
 417         const source = fs.readFileSync(path);
 418         imports.env["js_invoke_function"] = js_invoke;
 419         const { instance: wasmInstance } = await WebAssembly.instantiate(source, imports);
 420         wasm = wasmInstance.exports;
 421         if (!wasm.test_bigint_pass_deadbeef0badf00d(BigInt("0xdeadbeef0badf00d"))) {
 422                 throw new Error(\"Currently need BigInt-as-u64 support, try ----experimental-wasm-bigint");
 423         }
 424         isWasmInitialized = true;
 425 };
 426 """
 427         else:
 428             res += """
 429 export async function initializeWasm(uri: string) {
 430         const stream = fetch(uri);
 431         imports.env["js_invoke_function"] = js_invoke;
 432         const { instance: wasmInstance } = await WebAssembly.instantiateStreaming(stream, imports);
 433         wasm = wasmInstance.exports;
 434         if (!wasm.test_bigint_pass_deadbeef0badf00d(BigInt("0xdeadbeef0badf00d"))) {
 435                 throw new Error(\"Currently need BigInt-as-u64 support, try ----experimental-wasm-bigint");
 436         }
 437         isWasmInitialized = true;
 438 };
 439
 440 """
 441
 442         return res + """
 443
 444
 445 // WASM CODEC
 446
 447 const nextMultipleOfFour = (value: number) => {
 448         return Math.ceil(value / 4) * 4;
 449 }
 450
 451 const encodeUint8Array = (inputArray: Uint8Array) => {
 452         const cArrayPointer = wasm.TS_malloc(inputArray.length + 4);
 453         const arrayLengthView = new Uint32Array(wasm.memory.buffer, cArrayPointer, 1);
 454         arrayLengthView[0] = inputArray.length;
 455         const arrayMemoryView = new Uint8Array(wasm.memory.buffer, cArrayPointer + 4, inputArray.length);
 456         arrayMemoryView.set(inputArray);
 457         return cArrayPointer;
 458 }
 459
 460 const encodeUint32Array = (inputArray: Uint32Array) => {
 461         const cArrayPointer = wasm.TS_malloc((inputArray.length + 1) * 4);
 462         const arrayMemoryView = new Uint32Array(wasm.memory.buffer, cArrayPointer, inputArray.length);
 463         arrayMemoryView.set(inputArray, 1);
 464         arrayMemoryView[0] = inputArray.length;
 465         return cArrayPointer;
 466 }
 467
 468 const getArrayLength = (arrayPointer: number) => {
 469         const arraySizeViewer = new Uint32Array(
 470                 wasm.memory.buffer, // value
 471                 arrayPointer, // offset
 472                 1 // one int
 473         );
 474         return arraySizeViewer[0];
 475 }
 476 const decodeUint8Array = (arrayPointer: number, free = true) => {
 477         const arraySize = getArrayLength(arrayPointer);
 478         const actualArrayViewer = new Uint8Array(
 479                 wasm.memory.buffer, // value
 480                 arrayPointer + 4, // offset (ignoring length bytes)
 481                 arraySize // uint8 count
 482         );
 483         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 484         // will free the underlying memory when it becomes unreachable instead of copying here.
 485         const actualArray = actualArrayViewer.slice(0, arraySize);
 486         if (free) {
 487                 wasm.TS_free(arrayPointer);
 488         }
 489         return actualArray;
 490 }
 491 const decodeUint32Array = (arrayPointer: number, free = true) => {
 492         const arraySize = getArrayLength(arrayPointer);
 493         const actualArrayViewer = new Uint32Array(
 494                 wasm.memory.buffer, // value
 495                 arrayPointer + 4, // offset (ignoring length bytes)
 496                 arraySize // uint32 count
 497         );
 498         // Clone the contents, TODO: In the future we should wrap the Viewer in a class that
 499         // will free the underlying memory when it becomes unreachable instead of copying here.
 500         const actualArray = actualArrayViewer.slice(0, arraySize);
 501         if (free) {
 502                 wasm.TS_free(arrayPointer);
 503         }
 504         return actualArray;
 505 }
 506
 507 const encodeString = (string: string) => {
 508         // make malloc count divisible by 4
 509         const memoryNeed = nextMultipleOfFour(string.length + 1);
 510         const stringPointer = wasm.TS_malloc(memoryNeed);
 511         const stringMemoryView = new Uint8Array(
 512                 wasm.memory.buffer, // value
 513                 stringPointer, // offset
 514                 string.length + 1 // length
 515         );
 516         for (let i = 0; i < string.length; i++) {
 517                 stringMemoryView[i] = string.charCodeAt(i);
 518         }
 519         stringMemoryView[string.length] = 0;
 520         return stringPointer;
 521 }
 522
 523 const decodeString = (stringPointer: number, free = true) => {
 524         const memoryView = new Uint8Array(wasm.memory.buffer, stringPointer);
 525         let cursor = 0;
 526         let result = '';
 527
 528         while (memoryView[cursor] !== 0) {
 529                 result += String.fromCharCode(memoryView[cursor]);
 530                 cursor++;
 531         }
 532
 533         if (free) {
 534                 wasm.wasm_free(stringPointer);
 535         }
 536
 537         return result;
 538 };
 539 """
 540
 541     def init_str(self):
 542         return ""
 543
 544     def constr_hu_array(self, ty_info, arr_len):
 545         return "new Array(" + arr_len + ").fill(null)"
 546
 547     def var_decl_statement(self, ty_string, var_name, statement):
 548         return "const " + var_name + ": " + ty_string + " = " + statement
 549
 550     def for_n_in_range(self, n, minimum, maximum):
 551         return "for (var " + n + " = " + minimum + "; " + n + " < " + maximum + "; " + n + "++) {"
 552     def for_n_in_arr(self, n, arr_name, arr_elem_ty):
 553         return (arr_name + ".forEach((" + n + ": " + arr_elem_ty.java_hu_ty + ") => { ", " })")
 554
 555     def get_ptr(self, var):
 556         return "CommonBase.get_ptr_of(" + var + ")"
 557     def set_null_skip_free(self, var):
 558         return "CommonBase.set_null_skip_free(" + var + ");"
 559
 560     def add_ref(self, holder, referent):
 561         return "CommonBase.add_ref_from(" + holder + ", " + referent + ")"
 562
 563     def obj_defined(self, struct_names, folder):
 564         with open(self.outdir + "/index.mts", 'a') as index:
 565             index.write(f"export * from './{folder}/{struct_names[0]}.mjs';\n")
 566         with open(self.outdir + "/imports.mts.part", 'a') as imports:
 567             imports.write(f"import {{ {', '.join(struct_names)} }} from '../{folder}/{struct_names[0]}.mjs';\n")
 568
 569     def native_c_unitary_enum_map(self, struct_name, variants, enum_doc_comment):
 570         out_c = "static inline LDK" + struct_name + " LDK" + struct_name + "_from_js(int32_t ord) {\n"
 571         out_c = out_c + "\tswitch (ord) {\n"
 572         ord_v = 0
 573
 574         out_typescript_enum_fields = ""
 575
 576         for var, var_docs in variants:
 577             out_c = out_c + "\t\tcase %d: return %s;\n" % (ord_v, var)
 578             ord_v = ord_v + 1
 579             if var_docs is not None:
 580                 out_typescript_enum_fields += f"/**\n * {var_docs}\n */\n"
 581             out_typescript_enum_fields += f"{var},\n\t\t\t\t"
 582         out_c = out_c + "\t}\n"
 583         out_c = out_c + "\tabort();\n"
 584         out_c = out_c + "}\n"
 585
 586         out_c = out_c + "static inline int32_t LDK" + struct_name + "_to_js(LDK" + struct_name + " val) {\n"
 587         out_c = out_c + "\tswitch (val) {\n"
 588         ord_v = 0
 589         for var, _ in variants:
 590             out_c = out_c + "\t\tcase " + var + ": return %d;\n" % ord_v
 591             ord_v = ord_v + 1
 592         out_c = out_c + "\t\tdefault: abort();\n"
 593         out_c = out_c + "\t}\n"
 594         out_c = out_c + "}\n"
 595
 596         out_typescript = f"""
 597             export enum {struct_name} {{
 598                 {out_typescript_enum_fields}
 599             }}
 600 """
 601         out_typescript_enum = f"export {{ {struct_name} }} from \"../bindings.mjs\";"
 602         self.obj_defined([struct_name], "enums")
 603         return (out_c, out_typescript_enum, out_typescript)
 604
 605     def c_unitary_enum_to_native_call(self, ty_info):
 606         return (ty_info.rust_obj + "_to_js(", ")")
 607     def native_unitary_enum_to_c_call(self, ty_info):
 608         return (ty_info.rust_obj + "_from_js(", ")")
 609
 610     def native_c_map_trait(self, struct_name, field_var_conversions, flattened_field_var_conversions, field_function_lines, trait_doc_comment):
 611         out_typescript_bindings = "\n\n\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: START\n\n"
 612
 613         super_instantiator = ""
 614         bindings_instantiator = ""
 615         pointer_to_adder = ""
 616         impl_constructor_arguments = ""
 617         for var in flattened_field_var_conversions:
 618             if isinstance(var, ConvInfo):
 619                 impl_constructor_arguments += f", {var.arg_name}: {var.java_hu_ty}"
 620                 super_instantiator += first_to_lower(var.arg_name) + ", "
 621                 if var.from_hu_conv is not None:
 622                     bindings_instantiator += ", " + var.from_hu_conv[0]
 623                     if var.from_hu_conv[1] != "":
 624                         pointer_to_adder += "\t\t\t" + var.from_hu_conv[1] + ";\n"
 625                 else:
 626                     bindings_instantiator += ", " + first_to_lower(var.arg_name)
 627             else:
 628                 bindings_instantiator += ", " + first_to_lower(var[1]) + ".bindings_instance"
 629                 super_instantiator += first_to_lower(var[1]) + "_impl, "
 630                 pointer_to_adder += "\t\timpl_holder.held.ptrs_to.push(" + first_to_lower(var[1]) + ");\n"
 631                 impl_constructor_arguments += f", {first_to_lower(var[1])}_impl: {var[0].replace('LDK', '')}Interface"
 632
 633         super_constructor_statements = ""
 634         trait_constructor_arguments = ""
 635         for var in field_var_conversions:
 636             if isinstance(var, ConvInfo):
 637                 trait_constructor_arguments += ", " + var.arg_name
 638             else:
 639                 super_constructor_statements += "\t\tconst " + first_to_lower(var[1]) + " = " + var[1] + ".new_impl(" + super_instantiator + ");\n"
 640                 trait_constructor_arguments += ", " + first_to_lower(var[1]) + ".bindings_instance"
 641                 for suparg in var[2]:
 642                     if isinstance(suparg, ConvInfo):
 643                         trait_constructor_arguments += ", " + suparg.arg_name
 644                     else:
 645                         trait_constructor_arguments += ", " + suparg[1]
 646
 647         # BUILD INTERFACE METHODS
 648         out_java_interface = ""
 649         out_interface_implementation_overrides = ""
 650         java_methods = []
 651         for fn_line in field_function_lines:
 652             java_method_descriptor = ""
 653             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 654                 out_java_interface += "\t" + fn_line.fn_name + "("
 655                 out_interface_implementation_overrides += f"\t\t\t{fn_line.fn_name} ("
 656
 657                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 658                     if idx >= 1:
 659                         out_java_interface += ", "
 660                         out_interface_implementation_overrides += ", "
 661                     out_java_interface += f"{arg_conv_info.arg_name}: {arg_conv_info.java_hu_ty}"
 662                     out_interface_implementation_overrides += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 663                     java_method_descriptor += arg_conv_info.java_fn_ty_arg
 664                 out_java_interface += f"): {fn_line.ret_ty_info.java_hu_ty};\n"
 665                 java_method_descriptor += ")" + fn_line.ret_ty_info.java_fn_ty_arg
 666                 java_methods.append((fn_line.fn_name, java_method_descriptor))
 667
 668                 out_interface_implementation_overrides += f"): {fn_line.ret_ty_info.java_ty} {{\n"
 669
 670                 for arg_info in fn_line.args_ty:
 671                     if arg_info.to_hu_conv is not None:
 672                         out_interface_implementation_overrides += "\t\t\t\t" + arg_info.to_hu_conv.replace("\n", "\n\t\t\t\t") + "\n"
 673
 674                 if fn_line.ret_ty_info.java_ty != "void":
 675                     out_interface_implementation_overrides += "\t\t\t\tconst ret: " + fn_line.ret_ty_info.java_hu_ty + " = arg." + fn_line.fn_name + "("
 676                 else:
 677                     out_interface_implementation_overrides += f"\t\t\t\targ." + fn_line.fn_name + "("
 678
 679                 for idx, arg_info in enumerate(fn_line.args_ty):
 680                     if idx != 0:
 681                         out_interface_implementation_overrides += ", "
 682                     if arg_info.to_hu_conv_name is not None:
 683                         out_interface_implementation_overrides += arg_info.to_hu_conv_name
 684                     else:
 685                         out_interface_implementation_overrides += arg_info.arg_name
 686
 687                 out_interface_implementation_overrides += ");\n"
 688                 if fn_line.ret_ty_info.java_ty != "void":
 689                     if fn_line.ret_ty_info.from_hu_conv is not None:
 690                         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"
 691                         if fn_line.ret_ty_info.from_hu_conv[1] != "":
 692                             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"
 693                         #if fn_line.ret_ty_info.rust_obj in result_types:
 694                         # XXX: We need to handle this in conversion logic so that its cross-language!
 695                         # Avoid double-free by breaking the result - we should learn to clone these and then we can be safe instead
 696                         #    out_interface_implementation_overrides = out_interface_implementation_overrides + "\t\t\t\tret.ptr = 0;\n"
 697                         out_interface_implementation_overrides += "\t\t\t\treturn result;\n"
 698                     else:
 699                         out_interface_implementation_overrides += "\t\t\t\treturn ret;\n"
 700                 out_interface_implementation_overrides += f"\t\t\t}},\n"
 701
 702         out_typescript_human = f"""
 703 {self.hu_struct_file_prefix}
 704
 705 export interface {struct_name.replace("LDK", "")}Interface {{
 706 {out_java_interface}}}
 707
 708 class {struct_name}Holder {{
 709         held: {struct_name.replace("LDK", "")};
 710 }}
 711
 712 export class {struct_name.replace("LDK","")} extends CommonBase {{
 713         /* @internal */
 714         public bindings_instance?: bindings.{struct_name};
 715
 716         /* @internal */
 717         constructor(_dummy: object, ptr: number) {{
 718                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
 719                 this.bindings_instance = null;
 720         }}
 721
 722         static new_impl(arg: {struct_name.replace("LDK", "")}Interface{impl_constructor_arguments}): {struct_name.replace("LDK", "")} {{
 723                 const impl_holder: {struct_name}Holder = new {struct_name}Holder();
 724                 let structImplementation = {{
 725 {out_interface_implementation_overrides}                }} as bindings.{struct_name};
 726 {super_constructor_statements}          const ptr: number = bindings.{struct_name}_new(structImplementation{bindings_instantiator});
 727
 728                 impl_holder.held = new {struct_name.replace("LDK", "")}(null, ptr);
 729                 impl_holder.held.bindings_instance = structImplementation;
 730 {pointer_to_adder}              return impl_holder.held;
 731         }}
 732 """
 733         self.obj_defined([struct_name.replace("LDK", ""), struct_name.replace("LDK", "") + "Interface"], "structs")
 734
 735         out_typescript_bindings += "export interface " + struct_name + " {\n"
 736         java_meths = []
 737         for fn_line in field_function_lines:
 738             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 739                 out_typescript_bindings += f"\t{fn_line.fn_name} ("
 740
 741                 for idx, arg_conv_info in enumerate(fn_line.args_ty):
 742                     if idx >= 1:
 743                         out_typescript_bindings = out_typescript_bindings + ", "
 744                     out_typescript_bindings += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
 745
 746                 out_typescript_bindings += f"): {fn_line.ret_ty_info.java_ty};\n"
 747
 748         out_typescript_bindings += "}\n\n"
 749
 750         out_typescript_bindings += f"export function {struct_name}_new(impl: {struct_name}"
 751         for var in flattened_field_var_conversions:
 752             if isinstance(var, ConvInfo):
 753                 out_typescript_bindings += f", {var.arg_name}: {var.java_ty}"
 754             else:
 755                 out_typescript_bindings += f", {var[1]}: {var[0]}"
 756
 757         out_typescript_bindings += f"""): number {{
 758         if(!isWasmInitialized) {{
 759                 throw new Error("initializeWasm() must be awaited first!");
 760         }}
 761         var new_obj_idx = js_objs.length;
 762         for (var i = 0; i < js_objs.length; i++) {{
 763                 if (js_objs[i] == null || js_objs[i] == undefined) {{ new_obj_idx = i; break; }}
 764         }}
 765         js_objs[i] = new WeakRef(impl);
 766         return wasm.TS_{struct_name}_new(i);
 767 }}
 768 """
 769
 770         out_typescript_bindings += '\n// OUT_TYPESCRIPT_BINDINGS :: MAP_TRAIT :: END\n\n\n'
 771
 772         # Now that we've written out our java code (and created java_meths), generate C
 773         out_c = "typedef struct " + struct_name + "_JCalls {\n"
 774         out_c += "\tatomic_size_t refcnt;\n"
 775         out_c += "\tuint32_t instance_ptr;\n"
 776         for var in flattened_field_var_conversions:
 777             if isinstance(var, ConvInfo):
 778                 # We're a regular ol' field
 779                 pass
 780             else:
 781                 # We're a supertrait
 782                 out_c = out_c + "\t" + var[0] + "_JCalls* " + var[1] + ";\n"
 783         out_c = out_c + "} " + struct_name + "_JCalls;\n"
 784
 785         for fn_line in field_function_lines:
 786             if fn_line.fn_name == "free":
 787                 out_c = out_c + "static void " + struct_name + "_JCalls_free(void* this_arg) {\n"
 788                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 789                 out_c = out_c + "\tif (atomic_fetch_sub_explicit(&j_calls->refcnt, 1, memory_order_acquire) == 1) {\n"
 790                 out_c = out_c + "\t\tFREE(j_calls);\n"
 791                 out_c = out_c + "\t}\n}\n"
 792
 793         for idx, fn_line in enumerate(field_function_lines):
 794             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 795                 assert fn_line.ret_ty_info.ty_info.get_full_rust_ty()[1] == ""
 796                 out_c = out_c + fn_line.ret_ty_info.ty_info.get_full_rust_ty()[0] + " " + fn_line.fn_name + "_" + struct_name + "_jcall("
 797                 if fn_line.self_is_const:
 798                     out_c = out_c + "const void* this_arg"
 799                 else:
 800                     out_c = out_c + "void* this_arg"
 801
 802                 for idx, arg in enumerate(fn_line.args_ty):
 803                     out_c = out_c + ", " + arg.ty_info.get_full_rust_ty()[0] + " " + arg.arg_name + arg.ty_info.get_full_rust_ty()[1]
 804
 805                 out_c = out_c + ") {\n"
 806                 out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) this_arg;\n"
 807
 808                 for arg_info in fn_line.args_ty:
 809                     if arg_info.ret_conv is not None:
 810                         out_c = out_c + "\t" + arg_info.ret_conv[0].replace('\n', '\n\t')
 811                         out_c = out_c + arg_info.arg_name
 812                         out_c = out_c + arg_info.ret_conv[1].replace('\n', '\n\t') + "\n"
 813
 814                 if fn_line.ret_ty_info.c_ty.endswith("Array"):
 815                     out_c += "\t" + fn_line.ret_ty_info.c_ty + " ret = (" + fn_line.ret_ty_info.c_ty + ")"
 816                     out_c += "js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 817                 elif fn_line.ret_ty_info.java_ty == "void":
 818                     out_c = out_c + "\tjs_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 819                 elif fn_line.ret_ty_info.java_ty == "String":
 820                     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)
 821                 elif not fn_line.ret_ty_info.passed_as_ptr:
 822                     out_c = out_c + "\treturn js_invoke_function_" + str(len(fn_line.args_ty)) + "(j_calls->instance_ptr, " + str(self.function_ptr_counter)
 823                 else:
 824                     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)
 825
 826                 self.function_ptrs[self.function_ptr_counter] = (struct_name, fn_line.fn_name)
 827                 self.function_ptr_counter += 1
 828
 829                 for idx, arg_info in enumerate(fn_line.args_ty):
 830                     if arg_info.ret_conv is not None:
 831                         out_c = out_c + ", (uint32_t)" + arg_info.ret_conv_name
 832                     else:
 833                         out_c = out_c + ", (uint32_t)" + arg_info.arg_name
 834                 out_c = out_c + ");\n"
 835                 if fn_line.ret_ty_info.arg_conv is not None:
 836                     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"
 837
 838                 out_c = out_c + "}\n"
 839
 840         # Write out a clone function whether we need one or not, as we use them in moving to rust
 841         out_c = out_c + "static void " + struct_name + "_JCalls_cloned(" + struct_name + "* new_obj) {\n"
 842         out_c = out_c + "\t" + struct_name + "_JCalls *j_calls = (" + struct_name + "_JCalls*) new_obj->this_arg;\n"
 843         out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->refcnt, 1, memory_order_release);\n"
 844         for var in field_var_conversions:
 845             if not isinstance(var, ConvInfo):
 846                 out_c = out_c + "\tatomic_fetch_add_explicit(&j_calls->" + var[1] + "->refcnt, 1, memory_order_release);\n"
 847         out_c = out_c + "}\n"
 848
 849         out_c = out_c + "static inline " + struct_name + " " + struct_name + "_init (JSValue o"
 850         for var in flattened_field_var_conversions:
 851             if isinstance(var, ConvInfo):
 852                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 853             else:
 854                 out_c = out_c + ", JSValue " + var[1]
 855         out_c = out_c + ") {\n"
 856
 857         out_c = out_c + "\t" + struct_name + "_JCalls *calls = MALLOC(sizeof(" + struct_name + "_JCalls), \"" + struct_name + "_JCalls\");\n"
 858         out_c = out_c + "\tatomic_init(&calls->refcnt, 1);\n"
 859         out_c = out_c + "\tcalls->instance_ptr = o;\n"
 860
 861         for (fn_name, java_meth_descr) in java_meths:
 862             if fn_name != "free" and fn_name != "cloned":
 863                 out_c = out_c + "\tcalls->" + fn_name + "_meth = (*env)->GetMethodID(env, c, \"" + fn_name + "\", \"" + java_meth_descr + "\");\n"
 864                 out_c = out_c + "\tCHECK(calls->" + fn_name + "_meth != NULL);\n"
 865
 866         for var in flattened_field_var_conversions:
 867             if isinstance(var, ConvInfo) and var.arg_conv is not None:
 868                 out_c = out_c + "\n\t" + var.arg_conv.replace("\n", "\n\t") +"\n"
 869         out_c = out_c + "\n\t" + struct_name + " ret = {\n"
 870         out_c = out_c + "\t\t.this_arg = (void*) calls,\n"
 871         for fn_line in field_function_lines:
 872             if fn_line.fn_name != "free" and fn_line.fn_name != "cloned":
 873                 out_c = out_c + "\t\t." + fn_line.fn_name + " = " + fn_line.fn_name + "_" + struct_name + "_jcall,\n"
 874             elif fn_line.fn_name == "free":
 875                 out_c = out_c + "\t\t.free = " + struct_name + "_JCalls_free,\n"
 876             else:
 877                 out_c = out_c + "\t\t.cloned = " + struct_name + "_JCalls_cloned,\n"
 878         for var in field_var_conversions:
 879             if isinstance(var, ConvInfo):
 880                 if var.arg_conv_name is not None:
 881                     out_c = out_c + "\t\t." + var.arg_name + " = " + var.arg_conv_name + ",\n"
 882                     out_c = out_c + "\t\t.set_" + var.arg_name + " = NULL,\n"
 883                 else:
 884                     out_c = out_c + "\t\t." + var.var_name + " = " + var.var_name + ",\n"
 885                     out_c = out_c + "\t\t.set_" + var.var_name + " = NULL,\n"
 886             else:
 887                 out_c += "\t\t." + var[1] + " = " + var[0] + "_init(" + var[1]
 888                 for suparg in var[2]:
 889                     if isinstance(suparg, ConvInfo):
 890                         out_c += ", " + suparg.arg_name
 891                     else:
 892                         out_c += ", " + suparg[1]
 893                 out_c += "),\n"
 894         out_c = out_c + "\t};\n"
 895         for var in flattened_field_var_conversions:
 896             if not isinstance(var, ConvInfo):
 897                 out_c = out_c + "\tcalls->" + var[1] + " = ret." + var[1] + ".this_arg;\n"
 898         out_c = out_c + "\treturn ret;\n"
 899         out_c = out_c + "}\n"
 900
 901         out_c = out_c + self.c_fn_ty_pfx + "long " + self.c_fn_name_define_pfx(struct_name + "_new", True) + "JSValue o"
 902         for var in flattened_field_var_conversions:
 903             if isinstance(var, ConvInfo):
 904                 out_c = out_c + ", " + var.c_ty + " " + var.arg_name
 905             else:
 906                 out_c = out_c + ", JSValue " + var[1]
 907         out_c = out_c + ") {\n"
 908         out_c = out_c + "\t" + struct_name + " *res_ptr = MALLOC(sizeof(" + struct_name + "), \"" + struct_name + "\");\n"
 909         out_c = out_c + "\t*res_ptr = " + struct_name + "_init(o"
 910         for var in flattened_field_var_conversions:
 911             if isinstance(var, ConvInfo):
 912                 out_c = out_c + ", " + var.arg_name
 913             else:
 914                 out_c = out_c + ", " + var[1]
 915         out_c = out_c + ");\n"
 916         out_c = out_c + "\treturn (long)res_ptr;\n"
 917         out_c = out_c + "}\n"
 918
 919         return (out_typescript_bindings, out_typescript_human, out_c)
 920
 921     def trait_struct_inc_refcnt(self, ty_info):
 922         return ""
 923
 924     def map_complex_enum(self, struct_name, variant_list, camel_to_snake, enum_doc_comment):
 925         bindings_type = struct_name.replace("LDK", "")
 926         java_hu_type = struct_name.replace("LDK", "").replace("COption", "Option")
 927
 928         out_java_enum = ""
 929         out_java = ""
 930         out_c = ""
 931
 932         out_java_enum += (self.hu_struct_file_prefix)
 933
 934         java_hu_class = ""
 935         java_hu_class += "export class " + java_hu_type + " extends CommonBase {\n"
 936         java_hu_class += "\tprotected constructor(_dummy: object, ptr: number) { super(ptr, bindings." + bindings_type + "_free); }\n"
 937         java_hu_class += "\t/* @internal */\n"
 938         java_hu_class += f"\tpublic static constr_from_ptr(ptr: number): {java_hu_type} {{\n"
 939         java_hu_class += f"\t\tconst raw_ty: number = bindings." + struct_name + "_ty_from_ptr(ptr);\n"
 940         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"
 941         out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n"
 942         out_c += "\tswitch(obj->tag) {\n"
 943         java_hu_class += "\t\tswitch (raw_ty) {\n"
 944         java_hu_subclasses = ""
 945
 946         out_java += "export class " + struct_name + " {\n"
 947         out_java += "\tprotected constructor() {}\n"
 948         var_idx = 0
 949         for var in variant_list:
 950             java_hu_subclasses = java_hu_subclasses + "export class " + java_hu_type + "_" + var.var_name + " extends " + java_hu_type + " {\n"
 951             java_hu_class += f"\t\t\tcase {var_idx}: "
 952             java_hu_class += "return new " + java_hu_type + "_" + var.var_name + "(ptr);\n"
 953             out_c += f"\t\tcase {struct_name}_{var.var_name}: return {var_idx};\n"
 954             hu_conv_body = ""
 955             for idx, (field_ty, field_docs) in enumerate(var.fields):
 956                 java_hu_subclasses = java_hu_subclasses + "\tpublic " + field_ty.arg_name + f": {field_ty.java_hu_ty};\n"
 957                 if field_ty.to_hu_conv is not None:
 958                     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"
 959                     hu_conv_body += f"\t\t" + field_ty.to_hu_conv.replace("\n", "\n\t\t\t") + "\n"
 960                     hu_conv_body += f"\t\tthis." + field_ty.arg_name + " = " + field_ty.to_hu_conv_name + ";\n"
 961                 else:
 962                     hu_conv_body += f"\t\tthis.{field_ty.arg_name} = bindings.{struct_name}_{var.var_name}_get_{field_ty.arg_name}(ptr);\n"
 963             java_hu_subclasses += "\t/* @internal */\n"
 964             java_hu_subclasses += "\tpublic constructor(ptr: number) {\n\t\tsuper(null, ptr);\n"
 965             java_hu_subclasses = java_hu_subclasses + hu_conv_body
 966             java_hu_subclasses = java_hu_subclasses + "\t}\n}\n"
 967             var_idx += 1
 968         out_java += "}\n"
 969         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"
 970         out_java += self.fn_call_body(struct_name + "_ty_from_ptr", "uint32_t", "number", "ptr: number", "ptr")
 971         out_c += ("\t\tdefault: abort();\n")
 972         out_c += ("\t}\n}\n")
 973
 974         for var in variant_list:
 975             for idx, (field_map, _) in enumerate(var.fields):
 976                 fn_name = f"{struct_name}_{var.var_name}_get_{field_map.arg_name}"
 977                 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"
 978                 out_c += "\t" + struct_name + " *obj = (" + struct_name + "*)(ptr & ~1);\n"
 979                 out_c += f"\tassert(obj->tag == {struct_name}_{var.var_name});\n"
 980                 if field_map.ret_conv is not None:
 981                     out_c += ("\t\t\t" + field_map.ret_conv[0].replace("\n", "\n\t\t\t"))
 982                     if var.tuple_variant:
 983                         out_c += "obj->" + camel_to_snake(var.var_name)
 984                     else:
 985                         out_c += "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name
 986                     out_c += (field_map.ret_conv[1].replace("\n", "\n\t\t\t") + "\n")
 987                     out_c += "\treturn " + field_map.ret_conv_name + ";\n"
 988                 else:
 989                     if var.tuple_variant:
 990                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + ";\n"
 991                     else:
 992                         out_c += "\treturn " + "obj->" + camel_to_snake(var.var_name) + "." + field_map.arg_name + ";\n"
 993                 out_c += "}\n"
 994                 out_java += self.fn_call_body(fn_name, field_map.c_ty, field_map.java_ty, "ptr: number", "ptr")
 995         out_java_enum += java_hu_class
 996         self.struct_file_suffixes[java_hu_type] = java_hu_subclasses
 997         self.obj_defined([java_hu_type], "structs")
 998         return (out_java, out_java_enum, out_c)
 999
1000     def map_opaque_struct(self, struct_name, struct_doc_comment):
1001         implementations = ""
1002         method_header = ""
1003
1004         hu_name = struct_name.replace("LDKC2Tuple", "TwoTuple").replace("LDKC3Tuple", "ThreeTuple").replace("LDK", "")
1005         out_opaque_struct_human = f"{self.hu_struct_file_prefix}"
1006         if struct_name.startswith("LDKLocked"):
1007             out_opaque_struct_human += "/** XXX: DO NOT USE THIS - it remains locked until the GC runs (if that ever happens */"
1008         out_opaque_struct_human += f"""
1009 export class {hu_name} extends CommonBase {implementations}{{
1010         /* @internal */
1011         public constructor(_dummy: object, ptr: number) {{
1012                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1013         }}
1014
1015 """
1016         self.obj_defined([hu_name], "structs")
1017         return out_opaque_struct_human
1018
1019     def map_tuple(self, struct_name):
1020         return self.map_opaque_struct(struct_name, "A Tuple")
1021
1022     def map_result(self, struct_name, res_map, err_map):
1023         human_ty = struct_name.replace("LDKCResult", "Result")
1024
1025         suffixes = f"export class {human_ty}_OK extends {human_ty} {{\n"
1026         if res_map.java_hu_ty != "void":
1027             suffixes += "\tpublic res: " + res_map.java_hu_ty + ";\n"
1028         suffixes += f"""
1029         /* @internal */
1030         public constructor(_dummy: object, ptr: number) {{
1031                 super(_dummy, ptr);
1032 """
1033         if res_map.java_hu_ty == "void":
1034             pass
1035         elif res_map.to_hu_conv is not None:
1036             suffixes += "\t\tconst res: " + res_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1037             suffixes += "\t\t" + res_map.to_hu_conv.replace("\n", "\n\t\t")
1038             suffixes += "\n\t\tthis.res = " + res_map.to_hu_conv_name + ";\n"
1039         else:
1040             suffixes += "\t\tthis.res = bindings." + struct_name.replace("LDK", "") + "_get_ok(ptr);\n"
1041         suffixes += "\t}\n}\n"
1042
1043         suffixes += f"export class {human_ty}_Err extends {human_ty} {{\n"
1044         if err_map.java_hu_ty != "void":
1045             suffixes += "\tpublic err: " + err_map.java_hu_ty + ";\n"
1046         suffixes += f"""
1047         /* @internal */
1048         public constructor(_dummy: object, ptr: number) {{
1049                 super(_dummy, ptr);
1050 """
1051         if err_map.java_hu_ty == "void":
1052             pass
1053         elif err_map.to_hu_conv is not None:
1054             suffixes += "\t\tconst err: " + err_map.java_ty + " = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1055             suffixes += "\t\t" + err_map.to_hu_conv.replace("\n", "\n\t\t")
1056             suffixes += "\n\t\tthis.err = " + err_map.to_hu_conv_name + ";\n"
1057         else:
1058             suffixes += "\t\tthis.err = bindings." + struct_name.replace("LDK", "") + "_get_err(ptr);\n"
1059         suffixes += "\t}\n}"
1060
1061         self.struct_file_suffixes[human_ty] = suffixes
1062         self.obj_defined([human_ty], "structs")
1063
1064         return f"""{self.hu_struct_file_prefix}
1065
1066 export class {human_ty} extends CommonBase {{
1067         protected constructor(_dummy: object, ptr: number) {{
1068                 super(ptr, bindings.{struct_name.replace("LDK","")}_free);
1069         }}
1070         /* @internal */
1071         public static constr_from_ptr(ptr: number): {human_ty} {{
1072                 if (bindings.{struct_name.replace("LDK", "")}_is_ok(ptr)) {{
1073                         return new {human_ty}_OK(null, ptr);
1074                 }} else {{
1075                         return new {human_ty}_Err(null, ptr);
1076                 }}
1077         }}
1078 """
1079
1080     def fn_call_body(self, method_name, return_c_ty, return_java_ty, method_argument_string, native_call_argument_string):
1081         has_return_value = return_c_ty != 'void'
1082         needs_decoding = return_c_ty in self.wasm_decoding_map
1083         return_statement = 'return nativeResponseValue;'
1084         if not has_return_value:
1085             return_statement = '// debug statements here'
1086         elif needs_decoding:
1087             converter = self.wasm_decoding_map[return_c_ty]
1088             return_statement = f"return {converter}(nativeResponseValue);"
1089
1090         return f"""export function {method_name}({method_argument_string}): {return_java_ty} {{
1091         if(!isWasmInitialized) {{
1092                 throw new Error("initializeWasm() must be awaited first!");
1093         }}
1094         const nativeResponseValue = wasm.TS_{method_name}({native_call_argument_string});
1095         {return_statement}
1096 }}
1097 """
1098     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):
1099         out_java = ""
1100         out_c = ""
1101         out_java_struct = None
1102
1103         out_java += ("\t")
1104         out_c += (self.c_fn_ty_pfx)
1105         out_c += (return_type_info.c_ty)
1106         out_java += (return_type_info.java_ty)
1107         if return_type_info.ret_conv is not None:
1108             ret_conv_pfx, ret_conv_sfx = return_type_info.ret_conv
1109         out_java += (" " + method_name + "(")
1110         out_c += (" "  + self.c_fn_name_define_pfx(method_name, True))
1111
1112         method_argument_string = ""
1113         native_call_argument_string = ""
1114         for idx, arg_conv_info in enumerate(argument_types):
1115             if idx != 0:
1116                 method_argument_string += (", ")
1117                 native_call_argument_string += ', '
1118                 out_c += (", ")
1119             if arg_conv_info.c_ty != "void":
1120                 out_c += (arg_conv_info.c_ty + " " + arg_conv_info.arg_name)
1121                 needs_encoding = arg_conv_info.c_ty in self.wasm_encoding_map
1122                 native_argument = arg_conv_info.arg_name
1123                 if needs_encoding:
1124                     converter = self.wasm_encoding_map[arg_conv_info.c_ty]
1125                     native_argument = f"{converter}({arg_conv_info.arg_name})"
1126                 method_argument_string += f"{arg_conv_info.arg_name}: {arg_conv_info.java_ty}"
1127                 native_call_argument_string += native_argument
1128         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)
1129
1130         out_java_struct = ""
1131         if not args_known:
1132             out_java_struct += ("\t// Skipped " + method_name + "\n")
1133         else:
1134             if not takes_self:
1135                 out_java_struct += (
1136                         "\tpublic static constructor_" + meth_n + "(")
1137             else:
1138                 out_java_struct += ("\tpublic " + meth_n + "(")
1139             for idx, arg in enumerate(argument_types):
1140                 if idx != 0:
1141                     if not takes_self or idx > 1:
1142                         out_java_struct += (", ")
1143                 elif takes_self:
1144                     continue
1145                 if arg.java_ty != "void":
1146                     if arg.arg_name in default_constructor_args:
1147                         for explode_idx, explode_arg in enumerate(default_constructor_args[arg.arg_name]):
1148                             if explode_idx != 0:
1149                                 out_java_struct += (", ")
1150                             out_java_struct += arg.arg_name + "_" + explode_arg.arg_name + ": " + explode_arg.java_hu_ty
1151                     else:
1152                         out_java_struct += arg.arg_name + ": " + arg.java_hu_ty
1153
1154         out_c += (") {\n")
1155         if out_java_struct is not None:
1156             out_java_struct += "): " + return_type_info.java_hu_ty + " {\n"
1157         for info in argument_types:
1158             if info.arg_conv is not None:
1159                 out_c += ("\t" + info.arg_conv.replace('\n', "\n\t") + "\n")
1160         if return_type_info.ret_conv is not None:
1161             out_c += ("\t" + ret_conv_pfx.replace('\n', '\n\t'))
1162         elif return_type_info.c_ty != "void":
1163             out_c += ("\t" + return_type_info.c_ty + " ret_val = ")
1164         else:
1165             out_c += ("\t")
1166         if c_call_string is None:
1167             out_c += (method_name + "(")
1168         else:
1169             out_c += (c_call_string)
1170         for idx, info in enumerate(argument_types):
1171             if info.arg_conv_name is not None:
1172                 if idx != 0:
1173                     out_c += (", ")
1174                 elif c_call_string is not None:
1175                     continue
1176                 out_c += (info.arg_conv_name)
1177         out_c += (")")
1178         if return_type_info.ret_conv is not None:
1179             out_c += (ret_conv_sfx.replace('\n', '\n\t'))
1180         else:
1181             out_c += (";")
1182         for info in argument_types:
1183             if info.arg_conv_cleanup is not None:
1184                 out_c += ("\n\t" + info.arg_conv_cleanup.replace("\n", "\n\t"))
1185         if return_type_info.ret_conv is not None:
1186             out_c += ("\n\treturn " + return_type_info.ret_conv_name + ";")
1187         elif return_type_info.c_ty != "void":
1188             out_c += ("\n\treturn ret_val;")
1189         out_c += ("\n}\n\n")
1190
1191         if args_known:
1192             out_java_struct += ("\t\t")
1193             if return_type_info.java_ty != "void":
1194                 out_java_struct += "const ret: " + return_type_info.java_ty + " = "
1195             out_java_struct += ("bindings." + method_name + "(")
1196             for idx, info in enumerate(argument_types):
1197                 if idx != 0:
1198                     out_java_struct += (", ")
1199                 if idx == 0 and takes_self:
1200                     out_java_struct += ("this.ptr")
1201                 elif info.arg_name in default_constructor_args:
1202                     out_java_struct += ("bindings." + info.java_hu_ty + "_new(")
1203                     for explode_idx, explode_arg in enumerate(default_constructor_args[info.arg_name]):
1204                         if explode_idx != 0:
1205                             out_java_struct += (", ")
1206                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1207                         if explode_arg.from_hu_conv is not None:
1208                             out_java_struct += (
1209                                 explode_arg.from_hu_conv[0].replace(explode_arg.arg_name, expl_arg_name))
1210                         else:
1211                             out_java_struct += (expl_arg_name)
1212                     out_java_struct += (")")
1213                 elif info.from_hu_conv is not None:
1214                     out_java_struct += (info.from_hu_conv[0])
1215                 else:
1216                     out_java_struct += (info.arg_name)
1217             out_java_struct += (");\n")
1218             if return_type_info.to_hu_conv is not None:
1219                 if not takes_self:
1220                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t").replace("this",
1221                                                                                                              return_type_info.to_hu_conv_name) + "\n")
1222                 else:
1223                     out_java_struct += ("\t\t" + return_type_info.to_hu_conv.replace("\n", "\n\t\t") + "\n")
1224
1225             for idx, info in enumerate(argument_types):
1226                 if idx == 0 and takes_self:
1227                     pass
1228                 elif info.arg_name in default_constructor_args:
1229                     for explode_arg in default_constructor_args[info.arg_name]:
1230                         expl_arg_name = info.arg_name + "_" + explode_arg.arg_name
1231                         if explode_arg.from_hu_conv is not None and return_type_info.to_hu_conv_name:
1232                             out_java_struct += ("\t\t" + explode_arg.from_hu_conv[1].replace(explode_arg.arg_name,
1233                                                                                              expl_arg_name).replace(
1234                                 "this", return_type_info.to_hu_conv_name) + ";\n")
1235                 elif info.from_hu_conv is not None and info.from_hu_conv[1] != "":
1236                     if not takes_self and return_type_info.to_hu_conv_name is not None:
1237                         out_java_struct += (
1238                                 "\t\t" + info.from_hu_conv[1].replace("this", return_type_info.to_hu_conv_name).replace("\n", "\n\t\t") + ";\n")
1239                     else:
1240                         out_java_struct += ("\t\t" + info.from_hu_conv[1].replace("\n", "\n\t\t") + ";\n")
1241
1242             if return_type_info.to_hu_conv_name is not None:
1243                 out_java_struct += ("\t\treturn " + return_type_info.to_hu_conv_name + ";\n")
1244             elif return_type_info.java_ty != "void" and return_type_info.rust_obj != "LDK" + struct_meth:
1245                 out_java_struct += ("\t\treturn ret;\n")
1246             out_java_struct += ("\t}\n\n")
1247
1248         return (out_java, out_c, out_java_struct)
1249
1250     def cleanup(self):
1251         for struct in self.struct_file_suffixes:
1252             with open(self.outdir + "/structs/" + struct + self.file_ext, "a") as src:
1253                 src.write(self.struct_file_suffixes[struct])
1254
1255         with open(self.outdir + "/bindings.mts", "a") as bindings:
1256             bindings.write("""
1257
1258 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) {
1259         const weak: WeakRef<object> = js_objs[obj_ptr];
1260         if (weak == null || weak == undefined) {
1261                 console.error("Got function call on unknown/free'd JS object!");
1262                 throw new Error("Got function call on unknown/free'd JS object!");
1263         }
1264         const obj: object = weak.deref();
1265         if (obj == null || obj == undefined) {
1266                 console.error("Got function call on GC'd JS object!");
1267                 throw new Error("Got function call on GC'd JS object!");
1268         }
1269         var fn;
1270 """)
1271             bindings.write("\tswitch (fn_id) {\n")
1272             for f in self.function_ptrs:
1273                 bindings.write(f"\t\tcase {str(f)}: fn = Object.getOwnPropertyDescriptor(obj, \"{self.function_ptrs[f][1]}\"); break;\n")
1274
1275             bindings.write("""\t\tdefault:
1276                         console.error("Got unknown function call from C!");
1277                         throw new Error("Got unknown function call from C!");
1278         }
1279         if (fn == null || fn == undefined) {
1280                 console.error("Got function call on incorrect JS object!");
1281                 throw new Error("Got function call on incorrect JS object!");
1282         }
1283         return fn.value.bind(obj)(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10);
1284 }""")